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  • 4001.
    Wu, Nan
    et al.
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Electronics, Mathematics and Natural Sciences.
    Wang, Bofei
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Electronics, Mathematics and Natural Sciences.
    Process and Analysis of Voice Signal by MATLAB2014Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Deliver message by voice is the most important, effective and common method of exchange information for mankind. Language is human specific features and human voice is commonly used tool which is also the important way to pass information to each other. The voice has large information capacity. So we can use modern method to study voice processing technology, so that people can easily transmit, store, access and apply the voice. In this thesis, we designed a collection system that can collect voice and use different filters to filter the noise. After filtering the noise, the voice will be more quality in mobile communication, radio, TV and so on. In this thesis we use Microsoft recorder to collect a voice, and then analyze its time-domain, the frequency spectrum and the characteristics of the voice signal. We use MATLAB‟s function to remove the noise which has been added to the voice, further use bilinear transformation method to design a filter which is based on Butterworth simulation and window function and then filter the voice signal which has been added noise. After that we compare the time-domain and frequency-domain of the original voice and noised voice, then playback the noised voice and de-noising voice and then compare the application of signal processing in FIR filter and IIR filter, especially in the perspectives of the signal filtering de-noising characteristics and applications. According to the comparison, we can determine which filter is the best.

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    Process and Analysis of Voice Signal by MATLAB
  • 4002.
    Wu, Sirui
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management.
    A study on Extraction of Natural Cities from the Nightlight Imagery Using Head/tail breaks method2013Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    With the high development of economic and demand for city research, an issue of detecting city boundaries plays an extremely important role in urbanization that promotes the progress of human civilization. Some critical applications such as land use, urban planning and city sprawl have been constantly discussed, which rely on the acquisition of city areas. For the better acquisition of city areas, choosing a proper method to capture city boundaries becomes significant where it greatly improves the value of city study. Although conventional data can be used to define the city boundaries, some drawbacks still exist when measuring the city boundaries in a global scale.

    Remote sensing (RS) data of nightlight imagery (2010) by Defense Meteorological Satellite Program’s Operational Linescan System (DMSP/OLS) acquired from National oceanic and atmospheric administration's National Geoscience Data Center (NOAA/NOGA) is applied to extract the city boundaries in fifty countries, of which these countries are chosen followed by the Gross Domestic Product that are ranked in top 50. In this case, the data distribution of nightlight imagery followed by heavy-tailed distribution. Head/tail break algorithm poses a possibility of calculating reasonable threshold and extracting the natural cities with the help of software based on the Geomatics information system (GIS). An extended study of power law is made by using of power law estimator from previous studies to check whether the extracted natural cities can match the power law distribution.

    Result shows that combination of the nightlight imagery data and the head/tail break is capable of extracting the city boundaries and a set of possible thresholds with visual inspection by using the head/tail break are executed. There is only one country, namely Belgium, cannot be processed due to its data properties. Result also address how well the natural cities of the fifty countries can be extracted in terms of visual inspection, among the chosen cities, 33 of countries boundaries can be better matched and 13 countries can fundamentally match the city boundaries. Meanwhile, an extended study of power law is provided and four countries have to be found that do not follow the power law distribution. From the result obtained, the study expects that integration of support data will efficiently increase the accuracy of extraction and more useful information can be acquired in further study. On the other hand, a comparative study of threshold decision needs to be verified, put it differently, whether using head/tail break with visual inspection on extracted city boundaries is helpful or not.

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  • 4003.
    Wu, Sirui
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management.
    Zipf's Law for Natural Cities Extracted from Location-Based Social Media Data2015Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Zipf’s law is one of the empirical statistical regularities found within many natural systems, ranging from protein sequences of immune receptors in cells to the intensity of solar flares from the sun. Verifying the universality of Zipf’s law can provide many opportunities for us to further seek the commonalities of phenomena that possess the power law behavior. Since power law-like phenomena, as many studies have previously indicated, is often interpreted as evidence for studying complex systems, exploring the universality of Zipf’s law is also of potential capability in explaining underlying generative mechanisms and endogenous processes, i.e. self-organization and chaos theory.

    The main purpose of this study was to verify whether Zipf’s law is valid for city sizes, city numbers and population extracted from natural cities. Unlike traditional city boundaries extracted by applying census-imposed and top-down imposed data, which are arbitrary and subjective, the study established the new kind of boundaries of cities, namely, natural cities through using four location-based social media data from Twitter, Brightkite, Gowalla and Freebase and head/tail breaks rule. In order to capture and quantify the hierarchical level for studying heterogeneous scales of cities, ht-index derived from head/tail breaks rule was employed. Furthermore, the validation of Zipf’s law was examined.

    The result revealed that the natural cities had deviations in subtle patterns when different social media data were examined. By employing head/tail breaks method, the result calculated the ht-index and detected that hierarchy levels were not largely influenced by spatial-temporal changes but rather data itself. On the other hand, the study found that Zipf’s law is not universal in the case of using location-based social media data. Compared to city numbers extracted from nightlight imagery, the study found out the reason why Zipf’s law does not hold for location-based social media data, i.e. due to bias of customer behavior. The bias mainly resulted in the emergence of natural cities were much more frequent than others in certain regions and countries so that making the emergence of natural cities was not exhibited objectively. Furthermore, the study showed whether Zipf’s law could be well observed depends not only on the data itself and man-made limitations but also on calculation methods, data precisions and scales and the idealized status of observed data.

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  • 4004.
    Wästgårds, Joel
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Electronics, Mathematics and Natural Sciences.
    Kostundervisning: En studie av läroplanernas inverkan på lärarnas arbetssätt och ämneskunskaper inom kost.2012Independent thesis Basic level (degree of Bachelor), 20 credits / 30 HE creditsStudent thesis
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  • 4005.
    Xia, Xiaolin
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management.
    A Comparison Study on a Set of Space Syntax based Methods: Applying metric, topological and angular analysis to natural streets, axial lines and axial segments2013Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Recently, there has been an increasing interest in looking at urban environment as a complex system. More and more researchers are paying attention to the study of the configuration of urban space as well as human social activities within it. It has been found that correlation exists between the morphological properties of urban street network and observed human social movement patterns. This correlation implies that the influence of urban configurations on human social movements is no longer only revealed from the sense of metric distance, but also revealed from topological and geometrical perspectives. Metric distances, topological relationships and angular changes between streets should be considered when applying space syntax analysis to an urban street network. This thesis is mainly focused on the comparison among metric, topological and angular analyses based on three kinds of urban street representation models: natural streets, axial lines and axial segments. Four study areas (London, Paris, Manhattan and San Francisco) were picked up for empirical study. In the study, space syntax measures were calculated for different combinations of analytical methods and street models. These theoretical space syntax accessibility measures (connectivity, integration and choice) were correlated to the corresponding practical human movement to evaluate the correlations. Then the correlation results were compared in terms of analytical methods and street representation models respectively. In the end, the comparison of results show that (1) natural-street based model is the optimal street model for carrying out space syntax analysis followed by axial lines and axial segments; (2) angular analysis and topological analysis are more advanced than metric analysis; and (3) connectivity, integration and local integration (two-step) are more suitable for predicting human movements in space syntax. Furthermore, it can be hypothesized that topological analysis method with natural-street based model is the best combination for the prediction of human movements in space syntax, for the integration of topological and geometrical thinking.

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    master thesis of Xiaolin Xia
  • 4006.
    Xiang, Luo
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management.
    A virtual Music fountain simulation based on particle system2013Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This report presents a real-time simulation of a music fountain which is simulated in three dimensions by a particle animation system. In this system, gravity and wind are factors that affect the locus movement of particles. Using kinematic equations, the dynamic behaviors of particles is modeled. A specific contribution of the work presented here is that parameters for the motion equation are estimated from sound playing in real-time which controls the dynamic behavior of animated fountain. An open source programming language called Processing is used to implement the environment. Results of the system are demonstrated in form of its graphical output and performance benchmarks from run-time evaluation. The author investigates the influence of the parameters of particle system and music attributes on the animation of the music fountain simulation. The size, number, color, texture and transparency of particles can influence the quality of music fountain simulation. Using FFT function to get music parameters is the best way to figure out differences between different music.

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    Xiang_Luo
  • 4007.
    Xiang, Tingting
    et al.
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management.
    Xu, Sujing
    University of Gävle, Center for Logistics and Innovative Production.
    Core Enterprise's Partner Selection in a Green Supply Chain2011Independent thesis Advanced level (degree of Master (One Year)), 15 credits / 22,5 HE creditsStudent thesis
    Abstract [en]

    Core enterprise is the center of Green Supply Chain (GSC) and it helps partners to meet the environmental standards and to improve GSC’s performance. However there are two questions for core enterprise when it establishes GSC: What roles do core enterprise play in GSC? How does core enterprise improve GSC’s performance? What criterions are considered when core enterprise chooses partners in GSC?

     

    In order to answer these questions, this paper will use following methods: firstly, Analytic hierarchy process (AHP) and Analytic network process (ANP) have be used to study on three research companies (IKEA, TOYOTA and Apple); Secondly, six interviews with research companies’ employees.

     

    After case study, the results show that when core enterprise chooses partners, it will draw up some criterions and sub-standards for partners to fulfill. Furthermore, core enterprise plays the roles as GSC’s builder, director, coordinator, and designer in the system.

     

    Finally, this paper answered the research questions: Firstly, in order to improve the performance of GSC, core enterprise should direct all partners in GSC to save materials and recycle waste in each link of GSC. Secondly, core enterprise can use four criterions to choose partners. These criterions are: environmental management performance, product-related elements, production-service levels, and enterprise culture.

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    Core Enterprise's Partner Selection in a Green Supply Chain
  • 4008.
    Xiao, Chuye
    et al.
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management.
    Jiang, Xi
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management.
    Implementation of utility calculations based on utility difference proportions2012Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This pilot study presents an implementation of utility calculation that is based on utility difference proportions. To conduct a utility calculation for a consequence, one needs to evaluate utility difference proportions and to calculate utility values. The application can help decision makers to compare consequences pairwise and make decisions easier regarding to the final output utility value for each consequence. On the other hand, the application is limited to a specific case with specified preference ordering. The application can be further developed into a more real interactive analytic decision-making support tool in the future.

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  • 4009.
    Xiao, Naiyuan
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Building, Energy and Environmental Engineering.
    Comfort temperature analysis in a historical stone church2015Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    In this thesis a church named Hamrånge, located North of the town Gävle in Sweden, has been studied. In this church thermal comfort is a problem that need to be considered. There is poor insulation and air leakage in the building envelope. And appearance doesn't allow to add any additional insulation, becauce people want to keep its original appearance. In cold weather the church is heated by bench heaters and radiators through direct electicity. 

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  • 4010.
    Xiao, Naiyuan
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Building, Energy and Environmental Engineering.
    Energy-efficiency building envelope technologies2014Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    In recent years, the excessive emission of greenhouse gas CO2, it causing globalwarming, already poses a serious threat to human survival. The problem catches theattention all over the world, and promoting the development of building energyefficiency. In order to the sustainable development of human beings, in 1992 theUnited Nations framework convention on climate change (UFCCC) organizationpublished the Kyoto protocol. In the Kyoto protocol, the European countriescommitted that during 2008 and 2012 they would reduce the amount of greenhouseemissions to 8% compare to 1990.[2] Building envelope technologies can helphouseholder reduce the energy consumption use in the building. Building envelopetechnologies used in the project Brogåden – Alingsås which save the energyconsumption from 204 kWh/ m2a to 95 kWh/ m2a in Sweden. While the cost just838SEK/m² or 8% of the total building costs. In China the envelope technologies usedin the project student apartment in Shandong building university save the energyconsumption about 72% compare with the old student apartments.

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    Energy-efficiency building envelope technologies
  • 4011.
    Xiao, Yi
    et al.
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management.
    Peng, Ronghe
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management.
    Rookie Plan: A New Type of Logistics Service Provider in China2015Independent thesis Advanced level (degree of Master (One Year)), 40 credits / 60 HE creditsStudent thesis
    Abstract [en]

    With the development of logistics market, the third party logistics can no longer solve all the problems in supply chain management, the appearance of fourth party logistics is a breakthrough solution to modern supply chain challenge. Since China has become the manufacturing center of the world, it attracts more attentions to its own logistics market. But at the same time, there are few studies on Chinese fourth party logistics.

    This purpose of the study is to research a fourth party logistics service provider in China, including the barriers and the recommendations to promote its development. The fourth party logistics assembles the resources, capabilities, and technologies of its own company and other companies to design, build and run comprehensive supply chain solutions (Foster 1999). The research objectives of the study are 1. Identify what is the smart logistics and the factors comprised smart logistics network in general. 2. Describe the Rookie plan and analysis its property and prospect. And 3. Classify the impact of smart logistics on customer satisfaction or requests, and formulate recommendations on how to improve the performance of Rookie plan.

    Due to such aims, this research pursues a hybrid method which consists both of survey and case study about the ‘Rookie Plan’. Hereby, not only the secondary data for theoretical framework establishment and information gathering of the case project is engaged, but also the primary data through questionnaire to the sellers on the ecommerce platform named ‘Taobao’. For enhancing the reliability and validity of the survey, the overall process is conducted base on a four step guideline, as well as four-phase data analysis method for analyzing the information. What is more, the overall analysis part is led by PEST model. The integration of all methods above confirm the reliability and validity of the research process.

    The results of survey show that there is a necessary to bring smart logistics into e-commerce, and there is a huge potential for the development of fourth party logistics.  This study has demonstrated that Rookie Plan, the new type of logistics service provider in China has obtained a significant achievement and bring the customers huge benefits, but it also faced some risks including it cannot guarantee all aspects of this plan can have well function, and the underdevelopment logistics infrastructure also hinder its development. As the reason of achieving a better development of Rookie plan and shining a light for other 4PL companies in China, the recommendations for Rookie Plan are strengthen the planning and construction of logistics infrastructure, promote the development of third party logistics service provider, and accelerate the integration of e-commerce and modern logistics industry. 

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  • 4012.
    Xiao, Ziye
    et al.
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management.
    Liu, Xingrui
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management.
    CSR implementation in large enterprises: Comparision between China and Sweden2013Independent thesis Advanced level (degree of Master (Two Years)), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Corporate Social Responsibility (CSR) has been widely talked about over decades. CSR is a concept proposed in Western Countries firstly and it asks for business to contribute sustainable economic development and to improve the quality of life by involving other stakeholders at the same time. The CSR among countries in Asia has beenspreadingin recent years. This thesis takes a closer comparison on the CSR between China and Sweden. As a case study with qualitative strategy, its main aims are to compare the driving forces, barriers, activities and deliverables in implementation of CSR in a Sweden-China context. Two Swedish enterprises and one Chinese enterprise are used as examples here in this study and both of their primary data by interview and secondary data by CSR or Sustainability Report are utilized.

    Theories refer to the implementation of CSR, the CSR in China and Sweden are used to establish the conceptual framework of this study. Empirical findings show that Chinese and Swedish enterprises both implement CSR in a similar way while the differences still exist. For instance, the Swedish enterprises stress the work on philanthropic responsibility to participate in local activities, while the Chinese enterprises contribute to the society by donation in natural disaster. Their activities, driving forces, barriers and deliverables are summarized in a model, respectively. Base on this fact, this thesis argues that the difference is due to the influence of cultural and political factors. Consequently, it leads to a situation that the Swedish enterprises have an advantage in implementation on caring of employees while the Chinese enterprises are good at making contributions to the larger society. This thesis can hopefully provide insightful comparison between the implementation of CSR in both Swedish and Chinese enterprises. As a conclusion, the study recommends that the future research should focus on CSR implementation of political influence.

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  • 4013.
    Xie, Tian
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Building, Energy and Environmental Engineering.
    Multi-zone modeling of Thermal Comfort and Energy Consumption of a hospital ward: a summer case study2010Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Hospital is of interest when consider its especial function. Because of the obviously different between the normal residential buildings, the requirement of hospitals’ indoor climate strictly differs from other buildings.

    The author starts this report by briefly stating the building construction currently. Surrounded the topic of thermal comfort and energy consumption, many suggestion and options came out in this report to develop a better condition.

    Firstly, the introduction of the hospital buildings requires the background of the hospital object and the purpose to this report will be stated.

    Secondly, the simulation tool and how to use this tool simulate our real case are introduced.

    Then, the summer case is investigated by this tool after the model is proved to be validated.

    Finally, the improvement of establishing a better indoor environment is raised and the results of improvement and conclusion can be found. The final result will show the optimal solution that discovered by this study after compared different alternatives carefully.

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    FULLTEXT01
  • 4014.
    Xie, ZhenYun
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Electronics, Mathematics and Natural Sciences, Electronics.
    A Microstrip Antenna for Medical Application: Tissues Detection2017Independent thesis Basic level (degree of Bachelor), 15 credits / 22,5 HE creditsStudent thesis
    Abstract [en]

    The purpose of this thesis is going to design a microstrip antenna that can detect the different tissue, according to this clue, we suppose that it can be used in medical application, for example to detect the breast tumor. Our research and guess are based on the different electrical properties of the tissue.

    Follow the conductivity and permittivity of different tissue, a simple 3D breast structure is going to be modelled, and a tumor tissue will be defined too. Four types of antenna have been designed and simulated in HFSS.

    The antenna with best performance will be manufactured, which is the rectangular microstrip antenna with gap, it works under 2.45Ghz resonate frequency, and with dimension 37.26mm×28.83mm.

    Test S21 of antenna in Vector Network Analyser with different biological tissue, in order to make a simple prove that the antenna can detect the different tissue. The result shows when we use the different tissue’s size and quantity, the S21 changes. 

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    Appendix
  • 4015.
    Xintao, Liu
    et al.
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management. KTH, School of Architecture and the Built Environment (ABE), Urban Planning and Environment, Geoinformatik och Geodesi.
    Ban, Yifang
    KTH, School of Architecture and the Built Environment (ABE), Urban Planning and Environment, Geoinformatik och Geodesi.
    Uncovering urban mobility patterns with massive floating car data2015In: Computers, Environment and Urban Systems, ISSN 0198-9715, E-ISSN 1873-7587Article in journal (Other academic)
    Abstract [en]

    Urban mobility patterns are crucial to understanding urban structures, with applications ranging from traffic forecasting to urban planning. This paper develops a bottom-up approach to assess urban mobility patterns in a quantitative manner based on over 14,200,000 GPS points obtained from 11,263 moving taxicabs in Wuhan, Hubei, China. These taxicabs are equipped with GPS devices and are continuously being driven; thus, the corresponding mobile data sets (i.e., floating car data) cover the entire urban open space and bear traffic characteristics. Consequently, such mobile data are unique and more suitable for urban mobility analysis. Instead of employing the commonly used trajectory methods, we divided the GPS points into moves and stops, focusing on the latter. We found that the time intervals for all of the stops demonstrate the scaling property; that is, the stops can be separated into far more short ones than long ones, which we believe to be typical of the traffic system. The long stops showed a cluster pattern in a self-organized way at different timelines. We extracted these spatiotemporal clusters in a natural way and found that their sizes bear a heavy-tailed distribution. We further analyzed their evolution in both time and space and then categorized them into hotspots and traffic jams, of which the distributions objectively and quantitatively suggest the dynamic and multiple nuclei of urban mobility patterns. This study also provides insights into research on mobile data from the perspective of a complex system.

  • 4016.
    Xu, Hanbing
    et al.
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Electronics, Mathematics and Natural Sciences.
    Hou, Kailin
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Electronics, Mathematics and Natural Sciences.
    A measurement system for static non-linearities2013Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Measuring static nonlinearities systems has been a hot topic in recent years. In this thesis, amplifier is a device as a static nonlinearities system. In most cases, amplifiers operate as a linear device under small signal conditions. However it becomes more nonlinear and distorting with increasing drive levels. It is applied in many fields, such as communication, mathematical, biology.

     

    This thesis is aiming to investigate the differences between linear and nonlinear modeling of circuits by modeling of a device and implementing a measurement system for electrical devices in MATLAB® as the tool. The approach to fulfill our aim is to find the coefficients of the model and getting the error between models and measured. In this thesis, the error is used to determine the goodness of fit in a specific model.

     

    Through working while following our project design, a comparison is made in the end between the modeling capabilities for two model structures: linear and polynomial, for two operation modes of an amplifier with lower and higher input power. 

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    A measurement system for static non-linearities
  • 4017.
    Xu, Shuiai
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management.
    Automatic location of number plates at night time2014Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    In transport information area, in order to improve control system, identifying vehicle plates is very important. For that reason we are focusing on recognizing the vehicle plate from an image. To distinguish one car from others, one should remove all area except the vehicle plate. Due to the extra difficulties, like limited light, distances, moving etc., it can be hard to detect the final vehicle plate. In this work, we have solved the location of vehicle plate at night time, by separating the objects from the background by using morphological processing and analyzing the characteristics of vehicle plates by using removal of noise and mathematical calculations. According to some characteristics of cars and vehicle plates we developed an algorithm to detect the number of final vehicle plate. This algorithm works fine, and the detected result is accurate.

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    fulltextBachelor Thesis for Automatic location of number plate at night time
  • 4018.
    Xu, Wenwen
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management.
    Supply Chain Financing: A Recipe to Ease SMEs' Financing2010Independent thesis Advanced level (degree of Master (One Year)), 15 credits / 22,5 HE creditsStudent thesis
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    FULLTEXT03
  • 4019.
    Xu, Zhengyan
    et al.
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management.
    Zhou, Yibing
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management.
    Specific Handwritten Chinese Character Recognition Based on Artificial Intelligence2013Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    As internet techniques are developing more and more quickly, internet becomes the

    main way to communicate with the outside world. In this case, written information

    on paper needs to be converted to digital information urgently, increasing the need

    for handwritten character recognition. The aim of this work is to discuss methods

    that can be used to recognize handwritten Chinese characters. We study geometric

    features and clustering of handwritten Chinese characters from three aspects, which

    are handwritten character preprocessing, feature extraction and clustering. To test

    the correctness of our method, an application was built that could learn to recognize

    five medium-hard handwritten Chinese characters by using a neural network.

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  • 4020.
    Xue, Fei
    University of Gävle, Faculty of Engineering and Sustainable Development.
    MOMENT BALANCE OF AN AXISYMMETRIC JET AND THE EFFECT OF AIR ENTRAINMENT FROM AMBIENT2010Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
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    FULLTEXT01
  • 4021.
    Yakob, Silvana
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management, Computer science.
    Utvecklingsprocess av en mobilapplikation anpassad för KOL patienter2016Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Syftet med arbetet var att utveckla en programvara (app) för patienter med kroniskt obstruktiv lungsjukdom (KOL) för att de skall kunna lära känna sin sjukdom bättre och därmed förbättra sin livsstil för att kunna bromsa försämringen av sjukdomen. Åldersgruppen som appen vänder sig till är mellan 40-80 år och för att de äldre skall ta till sig den nya tekniken med smartphones bör appen ha en enkel design. Den här gruppen patienter har kanske inte så stor teknikvana med datorer så det är också en anledning att ha en app som är lätt att använda.Utvecklingsprocessen av appen har gjorts i flera steg. Först formulerades en rad frågor om hur appen skulle fungera. Därefter formulerades frågor som patienten skulle svara på. Den första versionen av appen var en Powerpointdesign som därefter utvecklades i olika steg till en färdig Android app. Flera patienter fick testa appen under utvecklingens gång och även svara på ett frågeformulär om deras upplevelse av att använda appen. Patienterna gav förslag på ändringar och uttryckte behov av utveckling. Slutversionen av appen blev omtyckt av testgruppen och några förslag har även lämnats till vidare utveckling.

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    Utvecklingsprocess av en mobilapplikation anpassad för KOL patienter
  • 4022.
    Yang, Angelica
    et al.
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management, Industrial economics.
    Sandström, Emelie
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management, Industrial economics.
    Björklin, Madeleine
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management, Industrial economics.
    Etablering och utformning av en effektiv uthyrningsverksamhet av byggnadsmaskiner2018Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
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  • 4023.
    Yang, Bin
    et al.
    Department of Applied Physics and Electronics, Umeå University, Umeå, Sweden.
    Melikov, A.K.
    International Centre for Indoor Environment and Energy, Department of Civil Engineering, Technical University of Denmark, Denmark.
    Kabanshi, Alan
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Building Engineering, Energy Systems and Sustainability Science, Energy Systems and Building Technology.
    Zhang, C.
    Department of Civil Engineering, Aalborg University, Aalborg, Denmark.
    Bauman, F. S.
    Center for the Built Environment, University of California, Berkeley, CA, United States.
    Cao, G.
    Department of Energy and Process, Norwegian University of Science and Technology, KolbjørnHejesVei 1B, Trondheim, Norway.
    Awbi, H.
    School of Construction Management and Engineering, University of Reading, United Kingdom.
    Wigö, Hans
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Building Engineering, Energy Systems and Sustainability Science, Energy Systems and Building Technology.
    Niu, J.
    School of Architecture, Design and Planning, The University of Sydney, Australia.
    Cheong, K. W. D.
    Department of Building, School of Design and Environment, National University of Singapore, Singapore.
    Tham, K. W.
    Department of Building, School of Design and Environment, National University of Singapore, Singapore.
    Sandberg, Mats
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Building Engineering, Energy Systems and Sustainability Science, Energy Systems and Building Technology.
    Nielsen, P. V.
    Department of Civil Engineering, Aalborg University, Aalborg, Denmark.
    Kosonen, R.
    Department of Mechanical Engineering, School of Engineering, Aalto University, Espoo, Finland; College of Urban Construction, Nanjing Tech University, Nanjing, China.
    Yao, R.
    School of Construction Management and Engineering, University of Reading, United Kingdom.
    Kato, S.
    Institute of Industrial Science, The University of Tokyo, Tokyo, Japan.
    Sekhar, S. C.
    Department of Building, School of Design and Environment, National University of Singapore, Singapore.
    Schiavon, Stefano
    Center for the Built Environment, University of California, Berkeley, CA, United States.
    Karimipanah, Taghi
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Building Engineering, Energy Systems and Sustainability Science, Energy Systems and Building Technology.
    Li, X.
    Department of Building Science, School of Architecture, Tsinghua University, Beijing, China.
    Lin, Z.
    Division of Building Science and Technology, City University of Hong Kong, Hong Kong, Hong Kong.
    A review of advanced air distribution methods - theory, practice, limitations and solutions2019In: Energy and Buildings, ISSN 0378-7788, E-ISSN 1872-6178, Vol. 202, article id 109359Article in journal (Refereed)
    Abstract [en]

    Ventilation and air distribution methods are important for indoor thermal environments and air quality. Effective distribution of airflow for indoor built environments with the aim of simultaneously offsetting thermal and ventilation loads in an energy efficient manner has been the research focus in the past several decades. Based on airflow characteristics, ventilation methods can be categorized as fully mixed or non-uniform. Non-uniform methods can be further divided into piston, stratified and task zone ventilation. In this paper, the theory, performance, practical applications, limitations and solutions pertaining to ventilation and air distribution methods are critically reviewed. Since many ventilation methods are buoyancy driving that confines their use for heating mode, some methods suitable for heating are discussed. Furthermore, measuring and evaluating methods for ventilation and air distribution are also discussed to give a comprehensive framework of the review.

  • 4024.
    Yang, Bin
    et al.
    Department of Applied Physics and Electronics, Umeå University, Umeå, Sweden.
    Olofsson, Thomas
    Department of Applied Physics and Electronics, Umeå University, Umeå, Sweden.
    Nair, Gireesh
    Department of Applied Physics and Electronics, Umeå University, Umeå, Sweden.
    Kabanshi, Alan
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Building, Energy and Environmental Engineering, Energy system.
    Outdoor thermal comfort under subarctic climate of north Sweden – A pilot study in Umeå2017In: Sustainable cities and society, ISSN 2210-6707, Vol. 28, p. 387-397Article in journal (Refereed)
    Abstract [en]

    Outdoor microclimate is important to determine the quality of outdoor spaces. Swedish people cherish summer period and prefer more outdoor activities in summer because of long winter with harsh outdoor environments. People in urban areas use parks for recreation and outdoor activities frequently in summer. Under subarctic climate, limited studies have been performed to explore the effect of microclimate environments on usage of outdoor spaces such as parks. The study explored the relationship of microclimate environments, park use and human behavioral patterns in urban area of Umeå, Sweden, which is under subarctic climate. Observations of naturally occurring behavior were recorded. Structured interviews, based on specially designed questionnaires, were performed during July to August in 2015. Measurements of objective parameters for microclimate environments, including air dry bulb temperature, relative humidity, wind speed, solar radiation and globe temperature, were performed. Human subjective responses from the questionnaire survey were compared with objectively measured results. 49% of local persons still prefer higher solar radiation even under “slightly warm” Thermal Sensation Vote (TSV), which reflects their high expectation to solar radiation. Local persons in Umeå, who expose themselves to a wider climate, are more adapted to subarctic climate than non-local persons.

  • 4025.
    Yang, Canjun
    et al.
    Department of Mechanical Engineering, Zhejiang University, Hangzhou, Zhejiang, China.
    Virk, Gurvinder SinghUniversity of Gävle, Faculty of Engineering and Sustainable Development, Department of Electronics, Mathematics and Natural Sciences, Electronics.Yang, HuayongZhejiang University, Hangzhou, Zhejiang, China.
    Wearable Sensors and Robots: Proceedings of International Conference on Wearable Sensors and Robots 20152017Conference proceedings (editor) (Refereed)
    Abstract [en]

    These proceedings present the latest information on regulations and standards for medical and non-medical devices, including wearable robots for gait training and support, design of exoskeletons for the elderly, innovations in assistive robotics, and analysis of human–machine interactions taking into account ergonomic considerations. The rapid development of key mechatronics technologies in recent years has shown that human living standards have significantly improved, and the International Conference on Wearable Sensor and Robot was held in Hangzhou, China from October 16 to 18, 2015, to present research mainly focused on personal-care robots and medical devices. The aim of the conference was to bring together academics, researchers, engineers and students from across the world to discuss state-of-the-art technologies related to various aspects of wearable sensors and robots.  

  • 4026.
    Yang, Fan
    et al.
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Building, Energy and Environmental Engineering.
    Wang, Dongcan
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Building, Energy and Environmental Engineering.
    Challenges and countermeasures of China's energy security2015Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    To ensure energy security, the first to know what is energy, and second, what are the factors of non-security, means that the challenge of energy security. Finally, puts forward some policy or in the case of a reasonable method to solve it according to these problems. At present, energy security is facing two challenges of structural crisis and crisis management system. Concretely, main problems in that security are analyzed, which are considered to affect China and mostly embody in such four big areas as the great pressure in energy supply, the scarcity of relative energy resources, foreign oil dependence is too large, crisis management systems of energy security, the shortage of green energy. Furthermore the counter measures concerned are proposed, including saving energy and increasing the energy utilization rate, to establish strategic energy reserves, strengthening environmental protection and adjusting the primary energy structure.

    China's rapid economic growth lead to sharp increase in oil imports. Due to China relies on a single chokepoint, the Malacca Strait, which has caused a high degree of concern about the safety of its energy. Nearly three-quarters of its oil imports flowing through the Strait. In view of its strategic importance to China and China’s little sway on the waterway, this view is mainly focused on China’s energy demand and supply in two aspects of concern.

    The paper analysis of whether the current energy structure is appropriate and sustainable. Because the energy security is facing China's energy is more and more dependent on imported fuel and the need to convert energy to meet the demand of modern society and the rapid growth of the requirements of the economic challenges. Concludes that the China's new policy should focus on energy efficiency, energy saving, renewable energy and turned to the main energy source of natural gas.

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  • 4027.
    Yang, Frank
    et al.
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Building, Energy and Environmental Engineering, Environmental engineering.
    Goldman, Mattias
    Forum for reforms, entrepreneurship and sustainability (Fores), Stockholm, Sweden.
    Lagercrantz, Jakob
    The 2030 secretariat, Stockholm, Sweden.
    Sustainable Mobility the Chinese Way: Opportunities for European cooperation and inspiration2018 (ed. 1)Book (Refereed)
    Abstract [en]

    The book introduces China's endeavours in sustainable mobility to combat climate change and ease air pollution, including electric vehicles, high-speed rail, shared bikes and cars, etc. Suggestions are given on how Europe and China can learn from each other for a more sustainable world.

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    Sustainable Mibility the Chinese Way
  • 4028.
    Yang, Hongyu
    et al.
    Sun Yat-sen University.
    Chen, Taihan
    Sun Yat-sen University.
    Lin, Yuanyuan
    Sun Yat-sen University.
    Buccolieri, Riccardo
    University of Salento.
    Mattsson, Magnus
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Building Engineering, Energy Systems and Sustainability Science, Energy Systems and Building Technology.
    Zhang, Ming
    State Power Environmental Protection Research Institute, Nanjing.
    Hang, Jian
    Sun Yat-sen University.
    Wang, Qun
    University of Hong Kong.
    Integrated impacts of tree planting and street aspect ratios on CO dispersion and personal exposure in full-scale street canyons2020In: Building and Environment, ISSN 0360-1323, E-ISSN 1873-684X, Vol. 169, article id 106529Article in journal (Refereed)
    Abstract [en]

    Validated by experimental data, this paper performs computational fluid dynamics (CFD) simulations to investigate the influence of tree plantings on urban airflow and vehicular CO exposure in two-dimensional (2D) street canyons with various aspect ratios (building height/street width, AR = H/W = 0.5, 1, 3, 5) and ground-level source. The impacts of tree canopy bottom height (Htb = 2 m, 6 m), tree stand density (y-density = 0.33, 0.67, 1) and leaf area density (LAD = 0.5, 1, 2 m2/m3) are considered. Personal intake fraction (P_IF) and its spatial mean value in leeward and windward sides (<P_IF>lee, <P_IF>wind) and for entire streets (street intake fraction, <P_IF>) are adopted to assess overall pollutant exposure. For cases without trees, only one main vortex exists in shallow streets with AR = 0.5-3 and <P_IF> as AR = 3 (5.80 ppm) slightly exceeds AR = 0.5-1 (3.98-3.84 ppm). However, two counter-rotating vortexes appear in deep streets (AR = 5), inducing 1-2 orders smaller pedestrian-level velocity (U/Uref~10−4-10−3) and one-order greater <P_IF> (46.80 ppm) than shallow streets. Trees always weaken wind in streets and raise <P_IF> more in shallower streets by 46.0% as AR = 0.5 (3.98 ppm-5.81 ppm), 26.0-45.9% as AR = 1 (3.84 ppm to 4.84-5.60 ppm), 16.2-50.3% as AR = 3 (5.80 ppm to 6.74-8.72 ppm), but only 8.5-23.4% as AR = 5 (46.80 ppm to 50.78-57.73 ppm). Particularly, as AR = 1, trees raise <P_IF>lee (5.87 ppm) by 27.1-57.2%, while <P_IF>wind (1.80 ppm) only by 0%-23.3%. Higher Htb, smaller y-density or LAD produce less increase of <P_IF>. As AR = 3, vegetation increases <P_IF>lee (8.84 ppm) by 21.2%-66.4% but little affects <P_IF>wind (2.76 ppm). Lower Htb produces smaller <P_IF> differing from AR = 1. As AR = 5, vegetation increases <P_IF>wind (63.97 ppm) by 15.1-36.6% but reduces <P_IF>lee (29.63 ppm) by 5.2-8.5%. Although further investigations are still required for design purpose, this paper provides effective methodologies to quantify how vegetation influences street-scale pollutant exposure.

  • 4029.
    Yang, J
    et al.
    Guizho University.
    Yang, L
    Guizho University.
    Zhao, Ming
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management, Industrial economics. University of Gävle, Center for Logistics and Innovative Production.
    Gong, M
    Guizho University.
    Reliability Analysis of Hydraulic Oil System Based on L-M Method2012In: Application of Statistics and Management, ISSN 1002-1566, Vol. 6, p. 976-980Article in journal (Other academic)
  • 4030.
    Yang, J
    et al.
    Guizhou University.
    Zhao, Ming
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management, Industrial economics. University of Gävle, Center for Logistics and Innovative Production.
    Hu, W
    Guizhou University.
    Web Software Reliability Analysis Based on NHPP Model2012In: Jisuanji Gongcheng [Computer Engineering], ISSN 1000-3428, Vol. 38, no 14, p. 26-28Article in journal (Other academic)
    Abstract [en]

     This paper proposes a Web Software Reliability Growth Model(SRGM) with BurrX Testing Effort Function(TEF) based on Non-homogeneous Poisson Process(NHPP) and develops its application to Web software reliability analysis. The incorporated TEF depicts the relationship between Web workload and calendar time, and solves the problem about high uneven of Web workload. By using the workload data and failure data from Web logs. Experimental results show that the proposed model can be used to describe the actual failure process more faithfully than G-O model, which is often used to analyze Web software.

  • 4031.
    Yang, Jianfeng
    et al.
    Faculty of Information Engineering, Guizhou Institute of Technology, Guiyang, China .
    Liu, Yu
    Department of Systems Engineering and Engineering Management, City University of Hong Kong, Hong Kong, Hong Kong .
    Xie, Min
    Department of Systems Engineering and Engineering Management, City University of Hong Kong, Hong Kong, Hong Kong .
    Zhao, Ming
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management, Industrial economics. University of Gävle, Center for Logistics and Innovative Production.
    Modeling and analysis of reliability of multi-release open source software incorporating both fault detection and correction processes2016In: Journal of Systems and Software, ISSN 0164-1212, E-ISSN 1873-1228, Vol. 115, p. 102-110Article in journal (Refereed)
    Abstract [en]

    Large software systems require regular upgrading that tries to correct the reported faults in previous versions and add some functions to meet new requirements. It is thus necessary to investigate changes in reliability in the face of ongoing releases. However, the current modeling frameworks mostly rely on the idealized assumption that all faults will be removed instantaneously and perfectly. In this paper, the failure processes in testing multi-release software are investigated by taking into consideration the delays in fault repair time based on a proposed time delay model. The model is validated on real test datasets from the software that has been released three times with new features. A comprehensive analysis of optimal release times based on cost-efficiency is also provided, which could help project managers to determine the best time to release the software. 

  • 4032.
    Yang, Jian-feng
    et al.
    College of Computer Science & Information, Guizhou University, Guiyang 550025, China.
    Zhao, Ming
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management, Industrial economics. University of Gävle, Center for Logistics and Innovative Production.
    Maximum likelihood estimation for software reliability with masked failure data2013In: Systems engineering and electronics, ISSN 1001-506X, Vol. 35, no 12, p. 2665-2669Article in journal (Refereed)
    Abstract [en]

    The masked data are the system failure data when the exact cause of the failures might be unknown. That is, it is the subset of components known to contain the component causing system failures. In general, the maximum likelihood estimation (MLE) of parameters are difficult to find when there exist masked data, because superposition non-homogenous Poisson process (NHPP) software reliability model cannot be decomposed into the independent NHPP models. In this paper, the MLE of software reliability from masked data is studied based on superposition NHPP models. Finally, numerical example based on simulation data is given to illustrate a good performance of MLE.

  • 4033. Yang, Jianfeng
    et al.
    Zhao, Ming
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management, Industrial economics. University of Gävle, Center for Logistics and Innovative Production. Guizhou University, Guiyang, China.
    Hu, Wensheng
    Web software reliability modeling with random impulsive shocks2014In: Journal of Systems Engineering and Electronics, ISSN 1004-4132, Vol. 25, no 2, p. 349-356Article in journal (Refereed)
    Abstract [en]

    As the web-server based business is rapidly developed and popularized, how to evaluate and improve the reliability of web-servers has been extremely important. Although a large number of software reliability growth models (SRGMs), including those combined with multiple change-points (CPs), have been available, these conventional SRGMs cannot be directly applied to web software reliability analysis because of the complex web operational profile. To characterize the web operational profile precisely, it should be realized that the workload of a web server is normally non-homogeneous and often observed with the pattern of random impulsive shocks. A web software reliability model with random impulsive shocks and its statistical analysis method are developed. In the proposed model, the web server workload is characterized by a geometric Brownian motion process. Based on a real data set from IIS server logs of ICRMS website (www.icrms.cn), the proposed model is demonstrated to be powerful for estimating impulsive shocks and web software reliability.

  • 4034.
    Yang, Jiawei
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management, Industrial economics.
    Demand Forecast of China Courier Industry2016Independent thesis Advanced level (degree of Master (One Year)), 40 credits / 60 HE creditsStudent thesis
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  • 4035.
    YANG, TINGTING
    et al.
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management.
    SHAO, YINGNAN
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management.
    Differences Between Chinese and Franch Companies Regarding Total Quality Management: A Case Study of JKKR Co., Ltd and Veolia Water Group2012Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    There is a research about the essences and processes of Total Quality Management (TQM) implementation and its effects on organization performance. The results from the research report indicate that the adoption of TQM in China is extensive (Yusuf, Gunasekaran & Guo, 2007). Although many Chinese manufacturing firms began to implement TQM from 1978 onwards, China still lacks effective TQM systems and applications at the business level (Zhao, 1995). TQM is an effective method to improve business performance. It is expected that quality management will help quality people in manufacturing firms and industries, not only in China but also in other developing countries.

    This thesis aims to identify differences between Chinese and French companies regarding three of five cornerstones of TQM. They are customer focus, process focus and continuous improvement. The aim is to explain why differences exist and also examine how the companies are performing in TQM aspects as well.

    In this thesis the authors follow a research design and collect data from interviews and documentation to provide the theoretical framework and obtain empirical evidence for the thesis.

    Based on the findings, the authors compared the two companies regarding the three cornerstones. The reasons why there are the differences between the two companies are mainly social policies and the companies’ development stages.

    From the study, the authors raised some new ideas of cornerstones. Compared with Gauttam (2010), who gave an idea of The Four Pillars of TQM, the authors think that the processes are as significant as the customers. Thus, the authors made a new theory model to state their understanding of the relationship between TQM cornerstones, which is a contribution to theoretical framework. 

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  • 4036.
    Yang, Tingxiao
    University of Gävle, Faculty of Engineering and Sustainable Development.
    The Algorithms of Speech Recognition: programming and simulating in MATLAB2012Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The aim of this thesis work is to investigate the algorithms of speech recognition. The author programmed and simulated the designed systems for algorithms of speech recognition in MATLAB. There are two systems designed in this thesis. One is based on the shape information of the cross-correlation plotting. The other one is to use the Wiener Filter to realize the speech recognition. The simulations of the programmed systems in MATLAB are accomplished by using the microphone to record the speaking words. After running the program in MATLAB, MATLAB will ask people to record the words three times. The first and second recorded words are different words which will be used as the reference signals in the designed systems. The third recorded word is the same word as the one of the first two recorded words. After recording words, the words will become the signals’ information which will be sampled and stored in MATLAB. Then MATLAB should be able to give the judgment that which word is recorded at the third time compared with the first two reference words according to the algorithms programmed in MATLAB. The author invited different people from different countries to test the designed systems. The results of simulations for both designed systems show that the designed systems both work well when the first two reference recordings and the third time recording are recorded from the same person. But the designed systems all have the defects when the first two reference recordings and the third time recording are recorded from the different people. However, if the testing environment is quiet enough and the speaker is the same person for three time recordings, the successful probability of the speech recognition is approach to 100%. Thus, the designed systems actually work well for the basical speech recognition.

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  • 4037.
    Yang, Tingxiao
    et al.
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Electronics, Mathematics and Natural Sciences.
    Zenteno, Efrain
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Electronics, Mathematics and Natural Sciences, Electronics. Royal Institute of Technology, KTH. Signal Processing Laboratory, Stockholm, Sweden .
    Björsell, Niclas
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Electronics, Mathematics and Natural Sciences, Electronics.
    Measurement imperfections impact on the performance of digitally predistorted power amplifiers2014In: 2014 IEEE International Instrumentation and Measurement Technology Conference (I2MTC) Proceedings, 2014, p. 230-233Conference paper (Refereed)
    Abstract [en]

    This paper presents an study of the impact of analog to digital converter (ADC) impairments on digital pre-distortion (DPD) techniques when applied to RF power amplifiers (PA). The DPD technique is described by a memory polynomial model while the ADC impairments are modeled by quantization noise, random jitter, and the integral nonlinearity (INL); thus, summarizing systematic and random nature of ADC imperfect measurements. It is observed that increased jitter will have a negative impact on the modeling but not so much on the output performance from the pre-distorted PA. Moreover, the ENOB can be used as metric for both the quantization noise and integral nonlinearity and there is a value of ENOB which, if exceeded, do not improve the DPD performance; in this paper it is about 8 bits.

  • 4038.
    Yang, Xia
    et al.
    Sun Yat-sen University, Guangzhou, PR China.
    Zhang, Yong
    Sun Yat-sen University, Guangzhou, PR China.
    Hang, Jian
    Sun Yat-sen University, Guangzhou, PR China.
    Lin, Yuanyuan
    Sun Yat-sen University, Guangzhou, PR China.
    Mattsson, Magnus
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Building Engineering, Energy Systems and Sustainability Science, Energy Systems and Building Technology.
    Sandberg, Mats
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Building Engineering, Energy Systems and Sustainability Science, Energy Systems and Building Technology.
    Zhang, Ming
    State Power Environmental Protection Research Institute, Nanjing, China.
    Wang, Kai
    Department of Civil, Environmental and Geomatic Engineering, University College, London, UK.
    Integrated assessment of indoor and outdoor ventilation in street canyons with naturally-ventilated buildings by various ventilation indexes2020In: Building and Environment, ISSN 0360-1323, E-ISSN 1873-684X, Vol. 169, article id 106528Article in journal (Refereed)
    Abstract [en]

    The integrated assessments of indoor and outdoor ventilation are still rare so far. As a novelty, this paper aims to quantify the influence of street aspect ratios (building height/street width, H/W = 0.5–5) and window sizes (1 m × 1 m, 1.5 m × 1.5 m) on indoor-outdoor ventilation in two-dimensional streets with single-sided naturally-ventilated buildings. Numerical simulations with RNG k-ε model are validated against experimental data and the grid independence are tested as well. Air change rates per hour (ACH, h−1) are adopted for assessing indoor-outdoor ventilation by mean flows (ACHmean) and turbulent fluctuations (ACHturb) respectively. Age of air(τ), purging flow rate (PFR) and its corresponding ACHPFR are used to evaluate overall ventilation capacities.

    Shallower streets experience better indoor-outdoor ventilation. Outdoor ACHPFR drop from 14.69 to 17.55 h−1 to 3.96–3.97 h−1 as H/W rises from 0.5 to 3. In extremely deep canyon (H/W = 5), two-counter-rotating vortices produce much smaller velocity at low-level regions (U/Uref~10−3-10−5), resulting in small ACHPFR for outdoor (~0.76–0.91 h−1) and indoor in 1–13th floors (~0.03–0.61 h−1). When H/W = 0.5–1, leeward 5–6th floors experience smaller ACHPFR(e.g.~1.13–1.40 h−1 as H/W = 1) than the other floors (e.g. ~1.54–9.52 h−1 as H/W = 1). Particularly, as H/W = 2–3, leeward-side indoor ACHPFR in the middle floors (except the first and top two floors) are nearly constants (~1.02–1.69 h−1) and much smaller than windward-side ACHPFR(~1.41–4.35 h−1) which increase toward upper floors. Besides, the smaller window size reduces indoor ACHPFR by 19.38%~88.28%, but hardly influences outdoor ventilation. Moreover, both outdoor and indoor ACHPFR are greater than ACHmean but smaller than ACHmean + ACHturb. Although further investigations are still required, this paper provides an insight and scientific foundation on integrated indoor-outdoor ventilation evaluation with various effective ventilation indexes.

  • 4039.
    Yang, Xinping
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management.
    Navigating/Browsing In 3D with WebGL2010Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The use of the internet has become very important in our daily life. At present, web pages are mostly shown as two-dimensional content. Three-dimensional web pages are rarely seen on the Internet. In this thesis, the main task is to develop an interactive 3D (three-dimensional) web prototype for the company Interactive TV Arena. This three-dimensional web prototype will be integrated to the OSIA (open server interface architecture) project which is a project in Interactive TV Arena. In order to implement the prototype, three main tasks were addressed: The first is creating the framework of the prototype with XML files. Secondly, a parser framework was built with JavaScript classes. The third task is to render the prototype with WebGL in real time. The prototype can be used to develop the 3D web pages in modern browsers. This thesis has completed most of the aforementioned tasks and the result of it can be used to develop some simple 3D web pages.

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  • 4040.
    Yang, Yanqing
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management.
    Segmentation of digital urban maps into region2011Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    With the rapid development of urban areas, the areas which may be used for new buildings are becoming smaller and smaller. Cities are divided into different areas based on the activities in these areas, a process called functional zoning. Depending on the functional zone, different kinds of buildings may be built. This thesis consists of two parts. The first part discusses segmentation of functional zones and image pre-processing such as morphological closing. The other part is about finding suitable building areas in Google maps. The thesis also presents an algorithm, implemented in Matlab, which provides a simple and efficient way of finding suitable building areas using Google maps.

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  • 4041.
    Yang, Yuchen
    et al.
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Building, Energy and Environmental Engineering.
    Liang, Jieqiong
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Building, Energy and Environmental Engineering.
    Energy Audit for the Gävle University Library2013Independent thesis Basic level (degree of Bachelor), 15 credits / 22,5 HE creditsStudent thesis
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    Energy Audit for the Gävle University Library
  • 4042.
    Yao, Li
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Building, Energy and Environmental Engineering.
    ENERGY AUDIT OF HIG STUDENT HOSTEL2014Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Nowadays in the world, energy usage effectiveness has always been an issue which blocks people’s development. How to effectively use the energy is becoming more and more important. Energy audit can appraise the energy usage condition of a building, and come up with improvement advices through systematic calculation and analysis the existing problems and reasons for energy wastes, in order to bring the object of effective usage of energy into reality.

    HiG student hostel 23 is situated in Gävle, a coastal city in the east of Sweden. There are three floors in Hostel 23, the first and second floor have 18 single rooms, 4 double rooms and 2 communal kitchens and the third floor is storeroom. The aim of this thesis is to explore indoor climate and energy use for this student hostel and find out the reason of the low temperature inside the room, seeking some ways to improve the thermal comfort inside the building during winter conditions.

    First, collect date from every part in energy balance by measurement and interview with administrator, then calculate and analyze the data. At last, the whole energy balance can be estimated. Through analyzing the whole energy balance, the suggestion is to change the window type and design a new ventilation system operating plan. Through the optimization, energy loss is reduced, and about 10% of the energy is preserved. Besides this, the building infiltration loss is too high through this energy audit; it states there still exists some problems. If these problems can be solved, it will be helpful to keep a good thermal comfort inside the building.

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  • 4043.
    Yao, Li
    et al.
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Building, Energy and Environmental Engineering.
    Liao, Xinyan
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Building, Energy and Environmental Engineering.
    Energy Audit of HiG Examination Building2014Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Nowadays, energy is becoming more and more important. With the development of society, the demand of energy is also increasing correspondingly. There is 22% of the total energy which is used in building part. A more effective and sustainable energy system becomes necessary due to increasing energy prices and demand. The aim of this thesis is to make an energy survey of this building, evaluating different sources of energy supply and losses in this building. By evaluating, a better thermal comfort is expectedly achieved when having examinations, and a possible saving method is also expected in order to reduce the cost of this system.

     In this project, the building is located in University of Gävle which is surveyed. It has 2 floors. The first floor is underground as a basement. An examination room is included in the second floor. There are a space heating system and heating recovery system ventilation in this examination building.

    At first step of analysis, the data of construction, ventilation, district heating and hot tap water were arranged by Mr. Magnus. Secondly, an energy balance had been done, and it helped to make energy input and output more clearly. In energy supply part, the solar radiation is 22.4MWh, the internal heat from people is 1.95MWh, the internal heat from equipment is 5.63MWh and district heating is 184MWh. In energy losses part, the transmission loss is 165MWh, the mechanical ventilation loss is 38.3MWh, the infiltration loss is 8.38MWh and the hot tap water is 2.09MWh. Thirdly, results of calculations were analyzed. At last, the optimization methods were given to save energy. The optimization methods were changing type of windows and improving indoor temperature which influenced the transmission loss part. Another method was reducing operating time of the ventilation system.

    Through these optimizing methods, the total energy use is reduced from 214MWh to 179MWh, and district heating is reduced from 184MWh to 149MWh. District heating of this building is supplied by Gävle Energi company, which is able to save 20% cost by these optimizing methods. According to the investment analysis, 19thousand SEK energy is saved per annum.

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  • 4044.
    Yao, Xiaobai Angela
    et al.
    Department of Geography, University of Georgia, Athens, USA.
    Huang, Haosheng
    Department of Geography, Universitat Zurich Institut fur Geographie, Zurich, Switzerland.
    Jiang, Bin
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Computer and Geospatial Sciences, Geospatial Sciences.
    Krisp, Jukka M.
    University of Augsburg, Augsburg, Germany.
    Representation and analytical models for location-based big data2019In: International Journal of Geographical Information Science, ISSN 1365-8816, E-ISSN 1365-8824, Vol. 33, no 4, p. 707-713Article in journal (Refereed)
  • 4045. Yao, Xiaobai
    et al.
    Jiang, Bin
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management, Land management, GIS.
    Liu, Yu
    Madden, Marguerite
    New insights gained from location-based social media data: VSI Preface for the special issue on New insights gained from location-based social media data2016In: Computers, Environment and Urban Systems, ISSN 0198-9715, E-ISSN 1873-7587, Vol. 58Article in journal (Refereed)
    Abstract [en]

    In the era of big data, increasingly sizeable datasets come from social media, particularly location-based social media, in the form that is widely known as user-generated contents. Many social media datasets are made available at the finest spatial and temporal scales. The availability of such data creates unprecedented opportunities for researchers to uncover what were previously hidden in the era of small data. What kinds of new research questions may be addressed with the available social media data? What are the social, ethical, and political implications of the wide use of social media platforms and the availability of such data? This special issue responds to the unique research opportunities and challenges from two broad perspectives. First, it looks at the need to develop new theories and data models for the management and analysis of social media data. Secondly, it advocates innovative acquisition and employment of social media data to enhance our understanding of human activities, social and spatial interactions, or the society as a whole. The inspiration for this special issue was the first ever International Conference on Location-based Social Media (ICLSM) held March 5-7, 2015 in Athens, Georgia, USA that brought together researchers from around the globe to discuss geosocial analysis and modeling of social media data. Geographers, GIScientists and social scientists gathered to report on the unique opportunities of collaboration and insights that can be gained from the analysis of location-based social media data collected from sources such as Facebook and Twitter. Participants shared innovative methods for social media data mining, big data analytics, social network analysis, social media data models and representations, human mobility and patterns of interaction.

  • 4046.
    Yao, Zhilei
    et al.
    University of Gävle, Faculty of Engineering and Sustainable Development.
    He, Yin
    University of Gävle, Faculty of Engineering and Sustainable Development.
    Sustainable Development at University: comparison of students’ knowledge, awareness and actions2010Independent thesis Advanced level (degree of Master (One Year)), 40 credits / 60 HE creditsStudent thesis
    Abstract [en]

    After the Rio United Nations Conference on Enviroment and Development, the need of sustainable development obtained recognition from the vast majority of countries and organization. Human society entered a new development period. More and more people know about sustainable  development. Education for sustainable development is a concern for the world where university can make a  contribution. Students who are the majority in a university, their knowledge, awarenss and action will play an important role to promote sustainable development.  

    The purpose if this thsis is to study if there is any difference in students' knowledge and awareness on sustainable development in university, based on the comparison betweet freshmen and seniors. Through the comparison, this will explore if students' knowledge and awareness is influence  to their action. This thesis does a literature review to understand deeply about sustainable development and explores students' knowledge, awareness and actions of sustainable development through questionnaire. 

    The analysis of data from the questionnaire indicates that their knowledge and awareness influences their actions. The freshmen and seniors have difference in knowledge and awareness. Knowledge of students on sustainable development appears to have increased slightly during years study. However, as the knowledge increased, there is not much difference in their knowledge and awareness of sustainable development. Based on the different degree of knowledge and awareness, seniors appear to do better than freshmen in their actions.

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  • 4047.
    Yazdanfar, Camellia
    et al.
    Department of Geology, University of Golestan, Iran; Department of Geology, University of Uroumieh, Iran.
    Nemati, Majid
    Department of Geology, Faculty of Science and Earthquake Research Center of Shahid Bahonar University of Kerman, Iran.
    Agh Ataby, Maryam
    Department of Geology, University of Golestan, Iran.
    Roustaei, Mahasa
    Geological Survey of Iran, Iran.
    Nilfouroushan, Faramarz
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management, Land management, GIS. Geodata Division, Lantmäteriet, Gävle, Sweden.
    Stress transfer, aftershocks distribution and InSAR analysis of the 2005 Dahuieh earthquake, SE Iran2018In: Journal of African Earth Sciences, ISSN 0899-5362, Vol. 147, no 86, p. 211-219Article in journal (Refereed)
    Abstract [en]

    In this paper, the authors studied the 2005 Dahuieh Zarand earthquake in SE Iran by combining Coulomb stress changes, InSAR study, locally recorded aftershocks and their spatial correlations, co-seismic slip distributions, Iso-seismal curves, and strong ground motion data. The event (MW 6.4) occurred in Kerman province, SE Iran, on February 22, 2005. The locally recorded aftershocks were used to calculate the Coulomb stress changes and the decay time based on Omori’s law. The decay time of aftershocks calculated by Omori’s law was about 500 days. A great correlation was particularly deduced from the spatial distribution of the aftershocks and areas of increased Coulomb stress for optimal strike slip faults. Moreover, using SAR Interferograms, we determined the postseismic surface deformations. Also, the majority of the coseismic slips occurred in the eastern part, where there was sparsely distributed aftershocks. The deformation maps showed active uplift for at least 300 days after the main shock. We reconciled time decays of the aftershocks with the postseismic uplifts, calculated from InSAR. In our model, which is based on after slip evolution, for one of the postseismic relaxation mechanisms, we found a proper correlation between the aftershock decay time and InSAR displacement maps to define postseismic motions. There is also a reasonable correspondence between the mainshock intensity, the acceleration map, and postseismic ground uplift, estimated by InSAR.

  • 4048.
    Ye, Heshan
    et al.
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management.
    Wu, Jiading
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management.
    Selection of a Logistics Service Provider Based on Analytic Hierarchy Process (AHP) Approach: A case study of Swedish Coffee Manufacturer—Gevalia2014Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Logistics outsourcing has been applied in practices by enterprises for decades, but its efficiency is always restricted because logistics service providers (LSPs) often only have a single function such as delivery or warehousing. In the last few years, LSPs have upgraded their capabilities to support some other logistics services including value-added services, materials management, information-related services etc. The purpose of this thesis is to identify the differences between self-built logistics system and outsourcing logistics system by using the Strengths Weaknesses Opportunities Threats (SWOT) strategic analysis; and figure out how to apply the Analytic Hierarchy Process (AHP) to make an appropriate selection among LSPs that based on the single-case study of Gevalia. Both quantitative and qualitative methods have been used in this study, authors expect to describe and explore the application of AHP approach regarding to the case company which implements outsourcing logistics system. Accordingly, it could be a good idea for case company to implement the mixed mode of self-built and outsourcing logistics system after using the SWOT strategic analysis. In addition, the production and logistics manager of case company emphasized that the five selection criteria including “compatibility”, “delivery performance”, “location”, “management” and “cost” should be considered as a priority among other different criterion when he selected a LSP. As a result, it will be efficient and effective for us to simulate a best decision for those industrial manufacturing enterprises to achieve a path regarding to the selection of the best logistics partner that based on the significant AHP approach.

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    Bachelor Thesis - Heshan Ye & Jiading Wu
  • 4049.
    Ye, Zi
    University of Gävle, Faculty of Engineering and Sustainable Development.
    Supply chain risk management on natural disaster: A study of global supply chain influence by2011Tohoku earthquake2011Independent thesis Basic level (degree of Bachelor), 15 credits / 22,5 HE creditsStudent thesis
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    Supply chain risk management on natural disaster
  • 4050.
    Ye, Ziqiao
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management.
    Tessellation of the sphere with different compression techniques2010Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Many kinds of data have a spherical representation, the idea is to tessellate the "sphere" in an efficient way and then decode the data so it can be compressed easily. In this paper, the process of exploration will start from the basic spherical wavelet-like to some new tessellation compression techniques in 3D to decompose the sphere with squares or triangles. The produced tessellation will have more round corners and the artefacts will be less prominent. Earth map will be textured on the sphere to compare the effect of different compression techniques.

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    FULLTEXT01
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