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  • 18501.
    Zhao, Ming
    University of Gävle, Department of Technology and Built Environment, Ämnesavdelningen för industriell ekonomi.
    Planning Models for Software Reliability and Cost1998In: IEEE Transactions on Software Engineering, ISSN 0098-5589, E-ISSN 1939-3520, Vol. 24, no 6, p. 420-434Article in journal (Refereed)
  • 18502.
    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.
    Preface2011In: ICRMS'2011 - Safety First, Reliability Primary: Proceedings of 2011 9th International Conference on Reliability, Maintainability and Safety, art. no. 5979227, 2011Conference paper (Other academic)
  • 18503.
    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.
    Proceedings of 2011 9th International Conference on Reliability, Maintainability and Safety2011Conference proceedings (editor) (Refereed)
  • 18504.
    Zhao, Ming
    University of Gävle, Department of Technology and Built Environment, Ämnesavdelningen för industriell ekonomi.
    Statistical Reliability change-point estimation models2003In: Handbook of Reliability Engineering / [ed] Hoang Pham, London: Springer , 2003, p. 157-163Chapter in book (Refereed)
  • 18505.
    Zhao, Ming
    University of Gävle, Department of Technology and Built Environment, Ämnesavdelningen för industriell ekonomi.
    Superposition of Power-law Models for Hardware/Software System Reliability Data Analysis2003In: International Journal of Reliability, Quality and Safety Engineering (IJRQSE), ISSN 0218-5393, Vol. 10, no 2, p. 121-130Article in journal (Other academic)
    Abstract [en]

    One of the widely used NHPP models in reliability is the so-called power-law model, also known as the Duane model. A power-law model can be applied in analyzing failure data of both software and hardware systems. Nevertheless, the power-law model is no longer applicable to describe the failure behavior when a hardware/software embedded system is concerned since the failures can come from both hardware and software. How to analyze the failure data of this type is still a problem to study and a new type of model is needed to develop. In this paper, we consider the superposition of the power-law models (SPLM) as one candidate to describe the failure behaviors of hardware/software systems. The characteristics of SPLMs are thoroughly studied. It is shown that an SPLM has the intensity function that can be increasing, decreasing, increasing-then-decreasing or decreasing-then-increasing. Specifically, the identification method of the superposition of power-law processes is provided by using the TTT-plot technique. The TTT-transform of a superposition of power-law processes is DFR-like. Therefore, the conditional TTT-plot should present a convex pattern if the system failures follow a superposition process by a few power-law processes. This provides us an easy way to identify the model when the testing data is available.

  • 18506.
    Zhao, Ming
    et al.
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Management, Industrial Design and Mechanical Engineering, Industrial Management. University of Gävle, Center for Logistics and Innovative Production.
    Yang, Janfieng
    School of Data Science, Department of Data Science, Guizhou Institute of Technology, Guiyang, 550003, Chin.
    Zhao, Bo
    Department of Mathematics, Reliability Center of Guizhou Province, Guizhou University, Guiyang, 550025, China.
    Wu, Zhenpeng
    Department of Mathematics, Reliability Center of Guizhou Province, Guizhou University, Guiyang, 550025, China.
    Copula-based reliability modelling of wireless sensor networks with dependent failures2019In: International Journal of Sensor Networks (IJSNet), ISSN 1748-1279, E-ISSN 1748-1287, Vol. 31, no 2, p. 90-98Article in journal (Refereed)
    Abstract [en]

    Wireless sensor networks (WSNs) have widely been applied in various industries and business fields covering large geographical regions. It is therefore important to be able to model, assess and predict the reliability of WSNs since the failures can have a great effect on the monitoring or control systems that are normally depending on the WSNs. In this paper, the general WSN reliability models are developed by deleting the independent assumption of component or subsystem failures and are consequently more reasonable to characterise the failure process of WSNs. The methodology in the proposed WSN reliability models is to consider that the failure times of subsystems are dependent variables and their joint distribution is obtained by binding their marginal failure distributions together through a copula function. For specific Frank copula functions, the Star-based WSN reliability models are derived and their properties are also discussed in this paper. 

  • 18507.
    Zhao, Ming
    et al.
    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. Reliability Engineering Center, Guizhou University, Guiyang, China .
    Yang, Jianfeng
    Guizho University.
    A DCA-based method for software prognostics and health management2012In: Proceedings of IEEE 2012 Prognostics and System Health Management Conference, PHM-2012, 2012, p. 6228830-Conference paper (Refereed)
    Abstract [en]

    In recent years, the prognostics and health management (PHM) technique has greatly been developed especially for electronic devices and systems. Little work, however, has been done on PHM techniques for software systems. During their total lifecycle, the software systems, due to various reasons such as new requirements or changes in technology, have to experience changes that can lead to a degeneration of the system's architecture. Therefore, it is important and necessary to identify and predict the software health status in order to avoid serious degeneration or erosion of system's architecture. In this paper, a software PHM approach based on Discriminant Coordinates Analysis (DCA) is proposed, and the health status of software systems is suggested to be categorized into five groups: Healthy, Normal, Sub-healthy, Unhealthy and Deteriorated. The proposed model based on software design metrics can help managers and developers predict and identify the software health status. Numerical example based on simulation data is given to illustrate its application on the modeling process.

  • 18508.
    Zhao, Ming
    et al.
    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.
    Zhang, Y. J.
    School of Mathematics and Physics, Anhui University of Technology, Maanshan, China.
    Yang, J. F.
    Faculty of Information Engineering, Guizhou Institute of Technology, Guiyang, China.
    Masked data analysis for storage reliability model with initial failures2018In: Safety and Reliability - Safe Societies in a Changing World - Proceedings of the 28th International European Safety and Reliability Conference, ESREL 2018 / [ed] Stein Haugen, Anne Barros, Coen van Gulijk, Trond Kongsvik, Jan Erik Vinnem, CRC Press/Balkema , 2018, p. 2565-2572Conference paper (Refereed)
    Abstract [en]

    Storage reliability is of importance for the products that largely stay in storage in their total life-cycle such as warning systems for harmful radiation detection, rescue systems, many kinds of defense systems, etc. The storage reliability of a product is commonly defined as the probability that the product can perform its specific function for a period of specific storage time under specific storage environment. Logically, the failures of the product in storage should be identified with the same criteria as in its operation process. However, the failure data in storage may be observed indirectly through the maintenance or inspection activities. Nevertheless, when the storage reliability is concerned in general, the reliability model should take into consideration the possibility that the operational reliability does not start at 100%, for example, the one-shot product may have only 96% operational reliability when they are newly produced. In this paper, the storage reliability model with possibly initial failures, which are usually neglected at the beginning of storage in most of storage models, is studied on the statistical analysis method when the masked data are observed. The parametric estimation procedure, based on the Least Squares method, is developed generally by applying an EM-like (Expectation and Maximization) algorithm for the storage data in which some information about which components have caused the system failures is not known, namely the failure data are masked. The estimates of the model parameters including the initial reliability are formalized. In the case of exponentially distributed storage lifetime and series system, a numerical example is provided to illustrate the method and procedure though the method is not limited to such case. The results should be useful for planning a storage environment, decision-making concerning the maximum length of storage, maintenance strategy optimization and identifying the production quality.

  • 18509.
    Zhao, Ming
    et al.
    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.
    Zhang, Y
    Guizho University.
    Xu, F R
    Guizho University.
    ESS profiles with step stress level2011In: ICRMS'2011 - Safety First, Reliability Primary: Proceedings of 2011 9th International Conference on Reliability, Maintainability and Safety, 2011, p. 1156-1161Conference paper (Refereed)
    Abstract [en]

    Environmental Stress Screening (ESS) is usually referred to the process of exposing a product to environmental stresses for detecting and eliminating latent defects made in manufacturing process. The common ESS profiles are using thermal cycling, random vibration or their combinations as the screening stresses. Various guidelines and standards have been available for determining an ESS profile. Nevertheless, there are cases that the standard ESS profiles may not be efficient enough to detect the latent defects in some manufacturing process. This paper reports the results of one industrial project on the ESS profile design for circuits. In the project, a comparative study was carried out for the evaluation of the ESS strength under the ESS profiles with incremental step stresses (ISS). The ISS profile under the study is firstly to implement a step thermal cycling and then perform the test with two screening stimuli concurrently: ordinary thermal cycling and random vibration of step increasing intensity levels. For the purpose of the comparative study, the ESS test samples were consisted of two groups A and B that were made at two different levels of manufacturing: soldering by skilled and unskilled workers, respectively. The comparative study shows that the ISS profiles are effective for exposing the latent defects in sample group A and B. Based on the project results, an ESS profile is recommended in this paper.

  • 18510.
    Zhao, Xuhui
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Electrical Engineering, Mathematics and Science, Electronics.
    Automatic analysis for continuous integration test failures2019Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    CI (Continuous Integration) is a software development practice which became more and more popular in last decade. Ericsson followed the trends and used CI several years. Because of the complexity of RBS (Radio Base Station) software few levels of CI have been implemented there. In RCS (RBS Control System) module CI there are many automatic JCAT (Java Common Auto Tester) test loops running every day and some of them failed. This thesis tries to find a way to classify these test failures automatically, so efficiency and lead time can be improved.

    Two methods are presented and investigated in this report, rule matching and machine learning. After analysis and comparisons rule matching approach is selected because it does not require huge effort in the initial phase and rule matched data can be used as labeled data for machine learning. This approach requires manual work to add new rules continuously but with correctly defined rules the accuracy is 100%, if the rule is general it can classify one type of issue including the ones which never happen before.

    One analysis system is designed and implemented, and only small update is required to the result report block of the CI flow. One matching example is showed and according to estimation this method could save many man hours every year.

  • 18511.
    ZHAO, YANG
    et al.
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management.
    WU, LEI
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management.
    Driving Force and Challenge of Developing Low-Carbon Economy in China2010Independent thesis Advanced level (degree of Master (One Year)), 40 credits / 60 HE creditsStudent thesis
    Abstract [en]

    With the growth of population and development of the global economy, the unrestrained use of natural and energy resources have seriously influenced environment and economy of world. Many people start to realize the serious environmental problems that come from the high energy utilizations, especially of high carbon dioxide (CO2) emissions. So Low-Carbon Economy has become focus of attention around the world; it also has become every country‟s strategic goals for future development under this global situation.As the biggest country of CO2 emissions in the world, China‟s development of Low-Carbon Economy is increasingly influencing the economy and environmental development in the world, and the country has faced more and more pressure after United Nations Climate Change Conference, 2009. Transition to Low-Carbon Economy is essential road for China, whether respond to the threat of climate change or balance domestic economic development with environmental sustainability. However, China also faces lots of challenges and pressure in the process of transition to Low-Carbon Economy.This thesis combines quantitative method with qualitative methods to do a research about driving force and challenges of developing Low-Carbon Economy in China. Firstly, it discusses the driving forces for China to develop Low-Caron Economy from two aspects-pressures and benefits. Secondly, it investigates challenges that China is likely to face in Low-Carbon Economy development from energy and economic aspect. Finally, it uses cause and effect diagram to explain the bottlenecks of Low-Carbon Economy development in China.Our conclusion is that China faces the bottleneck between challenges and driving force to develop Low-Carbon Economy. And this situation was caused by national actual situations and conditions in China. This explains also why China requested in Copenhagen Conference that “developing countries take appropriated measures to emission control and reduction in terms of receiving the funding and technology support from developed countries. Those emission reduction actions should be done according to the national actual situations and conditions.”

  • 18512.
    Zhao, Yixiang
    et al.
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Electronics, Mathematics and Natural Sciences.
    Niu, Hao
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Electronics, Mathematics and Natural Sciences.
    Measurement of dynamic parameters of Delta-Sigma ADC2012Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    In present day, digital signal processing (DSP) is a popular technology and widely used in many fields. There have increasing number of applications that need high resolution converters. Therefore, analog-to-digital converters play a major role in DSP, and a well-performed ADC will enhance the performance of a certain system. Different types of ADCs are available for various functions. Delta-sigma  converters are famous for high resolution. Dynamic parameters can be used to judge the performance of an ADC, this paper will focus on the critical parameters of spectrum analysis, which contains Signal-to-Noise-and-Distortion Ratio (SINAD), Effective Number of Bits (ENOB) and Spurious-free Dynamic Range (SFDR). The theory and test method of these critical parameters are proposed in this paper using the Evaluation Module and Matlab. The results we acquired from the Evaluation Module are SINAD=86.15dB, SFDR=109.2dB, ENOB=14.177bits; and the results we calculated from MATLAB are: SINAD=86.14dB, SFDR=108.8dB, ENOB=14bits.

  • 18513.
    zhao, zhiyang
    University of Gävle, Faculty of Engineering and Sustainable Development.
    Characterize the ZGST test bed2011Independent thesis Advanced level (degree of Master (Two Years)), 30 credits / 45 HE creditsStudent thesis
    Abstract [en]

    Nyquist Shannon theory states that sampling rate of ADC should be at least twice of signal bandwidth in order to avoid aliasing. According to this theory, extracting an accurate behavior model of power amplifier by digitizing its output signal is a difficult task for current general ADC in the market, due to the trade off among the sampling rate, resolution and reasonable cost. Because of nonlinear effect that a power amplifier presents, the signal bandwidth further spread in spectrum at output side, which results in shortage of sampling rate of ADC to sample such broadband signal. To solve this problem, a special designed system named ZGST is considered in this work.

     

    This works mainly considers characterizing ZGST measurement system which consists of a wide bandwidth down convertor and a high speed ADC. For down convertor, calibrations are carried on radio frequency, local oscillator and intermediate frequency. Thus a three port calibration is applied by using a vector network analyzer. Meanwhile, its dynamic performance is evaluated by measuring SFDR. For ADC, the amplitude response is characterized by using a signal analyzer.

     

    This thesis work also describes a smart sampling strategy which reduces the requirement on sampling rate for repetitive signal. This strategy is able to compact a broadband digital signal into a relative small Nyquist region without overlapping. Thus, in spite of analog digital convertor does not meet the Nyquit sampling constraint, it still can sample a wide bandwidth signal.

     

    Finally, a broadband output signal of a power amplifier is collected by ZGST measurement system, and it is reconstructed by removing the conversion loss in both amplitude and phase which is caused by system. 

  • 18514.
    Zhe, Qian
    et al.
    University of Gävle, Faculty of Engineering and Sustainable Development.
    Xiangying, Kong
    University of Gävle, Faculty of Engineering and Sustainable Development.
    Xing, Ma
    University of Gävle, Faculty of Engineering and Sustainable Development.
    Production logistics and control: case study in Kerneos a Franch building materials company2012Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    In a production cycling, the time spent on logistics activities is much longer than the actual time spent in the process. Therefore, the potential space of improving production logistics is very large in many aspects, such as the ability of researching production logistics, the time saving, and the labor saving in the company. By studying the function of the company's production logistics, we can deeply improve our understanding of it, and make the production logistics work efficiently during the whole process of the production cycling. As we know, there are two main modes of production, pull and push production. Choosing a right or better one is the most important in production logistics. The purpose of thesis is to make production logistics work efficiently by analyzing the current production mode in Kerneos (small subsidiaries in Guiyang City in China) as an example. Firstly, we want to make known what is production logistics and production mode, providing readers with production logistics functions and principles of choosing production mode. Then, we will analyze the current production mode of our case company. Finally, basing on our knowledge, we would like to share our opinions or ideas on how to choose a proper way to make our production logistics better in this article. The literature of thesis is focus on pull and push production, and how to choose an effective production type that suit for the enterprise situation. According to the research completed, we suggest using “push” in the enterprise which has large quantities, less variety, and the production cycle is plenty. In the small quantity, variety, and short-cycle, we suggest using “pull”. Otherwise, there come out a new production type named CONWIP(Constant work-in-process), through compared the different advantages and disadvantages between pull and push, our case company Kerneos is suggested to use this new production.

  • 18515.
    Zheng, Kangbin
    et al.
    University of Gävle, Faculty of Education and Business Studies, Department of Business and Economic Studies.
    Yan, Shiying
    University of Gävle, Faculty of Education and Business Studies, Department of Business and Economic Studies.
    Marketing Strategy during the Global Financial Crisis-a Case study of Great Partner Company, China2012Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
  • 18516.
    Zheng, Tian
    University of Gävle, Faculty of Education and Business Studies, Department of Business and Economic Studies.
    The Variance between Brand Positioning and Brand Perception: -A Case Study about Volvo Cars in China2012Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
  • 18517.
    Zheng, Yilong
    et al.
    University of Gävle, Department of Technology and Built Environment, Ämnesavdelningen för energi- och maskinteknik. University of Gävle, Department of Technology and Built Environment.
    Wang, Shuang
    University of Gävle, Department of Technology and Built Environment, Ämnesavdelningen för energi- och maskinteknik.
    ENERGY AUDIT OF A BUILDING: Skogmursskolan in Gävle2009Independent thesis Advanced level (degree of Master (One Year)), 15 credits / 22,5 HE creditsStudent thesis
    Abstract [en]

    The building was selected for a detailed study of heating consumption that is located in the city of Gävle and the top fifth energy consumption in this city in 2006. Classrooms, workshops, offices and a restaurant with kitchen compose the building of two floors.The aim of this thesis is to design the best approach to reduce consumption and achieve a high efficiency of energy utilization in these companies. The project is going to optimize the system.Series of measurements are taken to achieve the heat losses. The heat losses are calculated through the building in the first step. Afterwards, with the result of ventilation, heating and electrical usage an energy balance is made to calculate the efficiency of the installation through the building envelop.It is to study the indoor climate within a building, as well as energy consumption for the entire building. In addition, it is also used to measure the temperature of ventilation systems and check the schedule of air supply.Analyze the result of the value that is measured. Improve some part of this building that reduces the heating consumption.At last give some suggestion like construction a new roof reduce the heat loss and change some door that is not correct in the building.

  • 18518.
    Zhou, Jiawen
    et al.
    University of Gävle, Faculty of Education and Business Studies, Department of Business and Economic Studies.
    Liu, Meiyuan
    University of Gävle, Faculty of Education and Business Studies, Department of Business and Economic Studies.
    Job training in multinational companies: The case of Carl Zeiss in China2014Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    ABSTRACT

    Title:

    Job training in multinational companies --The case of Carl Zeiss in China

    Level:

    Final assignment for Master Degree in Business Administration

    Author:

    Jiawen Zhou, Meiyuan Liu

    Supervisor:

    Ehsanul Huda Chowdhury

    Examiner:

    Maria. Fregidou-Malama

    Date:

    05/2014

    Aim:

    Job training has been treated as the most popular approach to help with improving employees’ performance as well as company’s performance. However, some studies argue that there is some ineffectiveness in job training. This study aims to investigate employees’ needs for job training, the effectiveness and ineffectiveness of job training.

    Method:

    This study used both qualitative method and quantitative method through questionnaire and interviews. The findings were reported by analysis of mean method and standard deviation method.

    Result & Conclusions:

    This study shows that the more job training employees receivethe better performance they have. Another result of this study is that technology department employees have higher turnover intentionthan other departments after they receivejob training.

    Suggestions for future research:

    The limitation of this study is that it did not show much about the financial benefit of job training. Future research coulddone focusingmoreon this aspect. In addition, the transfer from training to application is also needed to be investigated later.

    Contribution of the thesis:

    For human resource managers, this study can givethem some suggestions toplantheirjobtraining program, in order to be more effective For other researchers, it can provide a vividunderstanding on the effects of job trainingin multinational companies.

    Key words:

    Job training, effectiveness, risk, evaluation, retention

  • 18519.
    Zhou, Yufeng
    et al.
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Electronics, Mathematics and Natural Sciences.
    Wang, Yan
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Electronics, Mathematics and Natural Sciences.
    To Measure Wind Speed using the theory of One-dimensional Ultrasonic Anemometer2011Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Ultrasonic anemometer (UA) is a core application in natural environment measurement. As well known, mechanical anemometer works well in good weather but it is not suitable to be applied in bad environment such as polar region and upper air. On the other hand, ultrasonic anemometer works well in most situations. Moreover, ultrasonic anemometer has wider detectable wind speed range. It can be said that ultrasonic anemometer is a more advanced instrument to measure wind velocity. In this paper, the theory of ultrasonic anemometer is first discussed. Using the theory, a test bed is then designed and constructed to measure one-dimensional wind speed. Active Butterworth filter is introduced into the circuit in order to increase the stability and accuracy. Furthermore, we test the one-dimensional ultrasonic anemometer and compare the measured wind speed with theoretical wind speed measured by a thermal anemometer device. Error is also discussed and improvement has also made during the experiment.

  • 18520.
    Zhou, Yun
    et al.
    University of Gävle, Department of Technology and Built Environment.
    Wang, Quanfeng
    Wind power in China2009Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    n today's complex environment, clear and sustainable energy is needed to support society development. How to develop the sustainable energy is a core issue in China. Compared with traditional energy, Wind energy has many advantages such as non-fuel cost, less pollution. And wind energy has the absolute advantage that it is worldwide  available. In many courtiers, wind energy has become a major part of their plans for sustainable development. The primary goal of this paper is to analysis advantages and disadvantages of wind power in China and the development potential of wind power in China. In this paper the main methodology is using the information about wind power in China, which is including current situation, development stage, industry development stage, and combining the real case to analysis wind power development potential in China. There are six parts of this paper which are the overview of wind power in china; case description, analysis, conclusions, suggestion, development perspectives and imagination In the first part, the overview of wind power in china, the history of wind power in china, wind resource distribution, wind power development stages, the situation of some key regions, wind  power industry develop stage and also some policies about wind power of Chinese government are discussed. The goal of this part is giving some fundamental information about wind power in China. In the second part, a real case has been described, and according to this case, the construction cost of a wind power plant in China has been discussed. The advantages and disadvantages of wind power are also analyzed based on this case study, such as long-team return, environmental impact, and also some other problem analysis. After the analysis parts, there are the conclusion parts, those parts are about the development perspectives and imagination of wind power in China.

  • 18521.
    Zhou, Yun
    et al.
    University of Gävle, Department of Technology and Built Environment.
    Ye, Yuhan
    University of Gävle, Department of Technology and Built Environment.
    Measuring and analyzing the continued innovation capability in Guizhou Huagong Tools Company  2009Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Just  as  the  innovation  is  one  of  the  key  elements  in  organization,  therefore  the continued  innovation capacity will derive organization successful. Whilst, measuring and analyzing CI capacity  in organization  is an  important activity. The primary goal of this paper is to audit and analyze the continued innovation (CI) capacity in Guizhou Huagong  Tools  Company  with  the  innovation  model  developed  by  Bessant&Tidd (2005).This  research  includes  literature  study  and  case  company  investigation,  both quality and quantity research is used in this thesis in order to obey the deductive logic. The finding of this thesis showed that Huagong Tools Company relying on a series of innovation mechanism has been  an  advance  innovation but not  the best  one,  this  is due  to  a  paucity  of  radical  innovation  and  capture  ability  from  innovation, furthermore,  an  ill-defined  innovation  strategy  has  been  incriminated  as  one  of  this circumstances,  depending  on  that,  authors  briefly  summarize  suggestions  for  the problems. At  last but not  least  the discussion about  innovation  theory  expounded  in the end.

  • 18522.
    Zhouhong, Liu
    University of Gävle, Faculty of Engineering and Sustainable Development.
    Development Direction of China's Railway Warehousing Industry2013Independent thesis Basic level (degree of Bachelor), 80 credits / 120 HE creditsStudent thesis
  • 18523.
    Zhu, Hongxu
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Electronics, Mathematics and Natural Sciences.
    Harmonic matching network for an amplifier2012Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Nowadays, ‘green’ communication is of great importance to save electric energy. In communication systems, power amplifiers (PAs) play an important role and consume large amount of power. As a consequence, the enhancement of amplifier efficiency is significantly important for saving energy.

     

    This thesis describes a method to enhance the amplifier efficiency. The goal for this thesis is to find the matching impedances of harmonics for optimum efficiency performance of an amplifier. The idea is to control and change the load impedances at 2nd and 3rd harmonics for maximum efficiency performance of an amplifier at fundamental frequency and finally to build a matching network according to the matching impedances at harmonics.

     

    The load pull technique is applied in this thesis to control the impedances with automatically controlled tuners. In this way, different impedances correspond to specific tuner positions. Then for different tuner positions, the corresponding load impedances of the harmonics are determined, the input, output as well as DC power of the amplifier are measured, and the corresponding efficiency is computed. Therefore, after appropriate efficiency sweep for specific tuner positions, the matching impedances with maximum efficiency performance can be found.

     

    The efficiency of the amplifier with harmonic matching (the method implemented in this thesis) can be improved 2.13 percent which proves the feasibility of the method investigated in this thesis.

  • 18524.
    Zhu, Weiling
    et al.
    University of Gävle, Faculty of Health and Occupational Studies, Department of Caring Sciences.
    Chen, Xiaolu
    University of Gävle, Faculty of Health and Occupational Studies, Department of Caring Sciences.
    Nurses’ occupational stressors and their coping strategies: A descriptive review2019Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
  • 18525.
    Zhu, Xuanlin
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Building, Energy and Environmental Engineering.
    A Feasibility Study of Using River Water in University Cooling System2015Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    This thesis is to study the feasibility of using river water from Gavleån in the cooling system of University of Gävle. The project is proposed by the campus service manager Akademiska Hus AB which intended to replace the current cooling production system with the water cooling system to reduce the electricity cost in cooling production. The river by direct distance is 600 meters from the university, the river water is to be extracted from the river via a pump house, flow through pipeline buried underground and delivered to the equipment house of Akademiska Hus.

     

    Most water source cooling prefer water body with decent depth which contain low temperature water to use as free cooling source, but the issue that limits the practice is, the decent depth is not a very common feature of most water body near or within urban area. Like Gavleån which has an average depth of not over five meters while the sufficient depth is over 50 meters for the least or 70 meters to 100 meters often. So study the potential of using rather high temperature water from shallow water body can be of high interest for most cooling consumers.

     

    The thesis progressed through the work in five parts. To introduce cooling in general starting with literature review, the concept, the mechanism, the device for end use and production, the demand of cooling and the reason behind it. Followed by case studies of water source cooling projects worldwide, which is mostly deep water source cooling, and another case of the local hospital cooling system that extract water from Gavleån, demonstrate the use of shallow water body in assisting cooling production, it gives some insights how the potential if similar system is to be implemented in the campus, which is mounted on the same river. Several tours to the hospital were taken to acquire data and understanding of the system.

     

    Then the water temperature measurement from Gavleån in 2014 summer is presented. The measurement was carried out at a small dock by the river side during July to September of 2014. The measurements show the temperature of river water has been increasing which limits free cooling throughout the year, additional refrigerator is required to produce chilled water. The river water, in the hot seasons is used as cooler for the refrigerator and in cold season can be used for free cooling directly. Simulation of IDA-ICE gives the cooling demand of modelled building blocks, the output of cooling production season (consistent with the hot seasons) matches the cooling consumption data from Akademiska Hus by an error of 1% (414743 kWh of simulated result to 415270 kWh in documentation of Akademiska Hus).

     

    To meet the demand of cooling and select more cost-effective refrigerator type, consumption and COP (COP: Coefficient of Performance) are calculated for compressor chiller and absorption chiller with basic cooling cycle for both. The results shown compressor chiller has much better performance but also higher consumption in electricity, while absorption chiller has rather low COP value in comparison but the need of energy input is much less given by its major consumption of energy is heat from hot water, already a purchased item by the university from district heating network. Cost-effectiveness wise speaking absorption chiller is a more optional choice. Reasonable values of assumption are largely employed in the calculation to select the better candidate and bring certain errors, which is then exam in sensitivity analysis to weigh the alternative parameter and the outcome from it.

     

    The last part is to estimate the cost of chillers and pipeline, for the concern of minimizing errors due to uncertainty the operation cost, labor cost and future energy price are not included. As the calculation turns out the payback year of the new system can range from 7 to 12 years by different refrigerator setup and pipeline routine design, which is considered within the life time of the chiller and pipeline, also lower than the current cooling cost of the university and therefore concluded as promising investment.

     

    Discussion and conclusion exam and finalize the whole thesis work. For the uncertainties of the calculation, the lack of information and data, which are improvements, can be done in future work. Also the improvements in other perspectives noted in terms of better load management for the cooling production units so the cost of equipment can be reduced, changes in building attachment and cooling device to reduce the demand of cooling, etc. But mostly draw the conclusion that with proper system configuration shallow water body can be helpful in reducing cooling consumption, and be a promising option for cities that have access to such water body. 

  • 18526.
    Zhu, Xuanlin
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Building, Energy and Environmental Engineering.
    Exploring the possibility of applying seasonal thermal energy storage in south-west of China2014Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Buildings energy consumption is rising continuously with massive urbanization progress, which then results in high greenhouse gas emission. A standing example is the urbanization process going on in the south-west part of China. Much has been discussed for improving building energy performance. However, to take another point of view, renewable energy source for buildings is a solution worth considering, for instance STES, which gains thermal energy from the sun, delivers it to buildings for space heating and hot tap water, also restores the solar energy in hot seasons in the storage system for the need of cold season.The aim of this paper is to couple the technology of STES with practical situation, explore the possibility of applying STES in south-west of China. This thesis work takes an estimation approach to weigh the possibility. The building project studied in this thesis is a campus project in the city of Guiyang, one of four major cities in the region of south-west China.Case study involves existing STES projects in Munich Germany and Anneberg Sweden, the performance evaluation of the Anneberg project is later to serve as an example in system gain & losses proportion, to guide the estimation work of the campus project.The estimation conclusion is drawn based on a cross-sectional analysis method, take the technology of STES, the practiced STES project and building projects in China as three loops visually, and observe how much they overlap each other. Behind the visual illustration, the overlapping is assessed with several factors, for instance possibility of storage system at location, possible STES performance and solar irradiation condition at site location etc. If most of these factors are checked to be “Ok” or “Good”, then the overlapping area is considered “large” enough, and therefore suggests a decent chance to implement STES system in the south-west China.A solar gain and sunlight simulation from a new police station energy consumption report assists in calculating the possible solar gain for the campus project, as the very close distance between these two sites (30 km) promises them the very similar solar irradiation condition. While the energy consumption of the studied campus project offers the energy demand for space heating and hot tap water in the need of 19,000 students, which is to be evaluated as the task of the STES system in the estimation work. Both building project reports are filed by GARDI (Architecture design research institution of Guizhou).Some key factors have been calculated and estimated, the heat demand of the studied campus project in Guiyang is 5,558 MWh/year, and the possible solar gain of this campus complexity is 4,900 MWh/year based on the gain & losses proportion of the Anneberg project evaluation. Due to the very different climate condition of Guiyang and Anneberg, as well as other uncertain factors such as effective roof area, solar collector efficiency, a sensitivity analysis evaluated the result with different parameters in changes of percentage. Final results in the changes of effective roof area at 80% and 85 %, borehole losses at 50% and 45%, available solar gain at 38%, STES system is shown to be capable of providing sufficient heat to buildings. If the heating demand and hot tap water, in the case of the campus project alone are all covered by STES system, there will be a reduction in CO2 emission of 5,368 tons/year.Cross-sectional analysis concludes four out of eight factors checked as “Good” and two as “Ok”, other two as “Unsure”. Other three cities (Chengdu, Kunming, and Chongqing) are brought to comparison later regarding climate condition. Besides Guiyang, two out of three are evaluated to have potential of STES implementation according to their sun hours, annual average temperature etc. STES system is estimated to be possible for implementation in south-west of China as the conclusion.

  • 18527.
    Zhu, Zhu
    et al.
    University of Gävle, Faculty of Engineering and Sustainable Development.
    Zhao, Jiangye
    University of Gävle, Faculty of Engineering and Sustainable Development.
    Logistic Risk Management in the Chinese Non-metallicMineral Industry: --A Case Study of Shenzhen Rocky Mountain2013Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This thesis is a single qualitative case study. The purpose of this thesis is to find out useful approaches to manage logistics risks for Chinese non-metallic mineral industry. A representative case company has been chosen as the research object. The authors aim at seeking out the useful and suitable processes and approaches in general, and seeking for the target industry. There is a research gap in the target industry for logistics risk management--the target industry is lacked of researches on risk management in logistics area. Multiple resources from internet, literature review and interviews have been summarized. According to the literature, in the conclusion part, the authors put forward 12 basic processes to manage risks in logistics management and logistics outsourcing, they also found out three simple processes, which are the most important steps, at last the authors suggested that as it is difficult for Chinese non-metallic mineral industry to fulfill these 12 steps, it is better to add another process to help the industry to complete the risk management in logistics management and logistics outsourcing.

  • 18528.
    Zhu, Zhu
    et al.
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management.
    Zhao, Jiangye
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management.
    Risk investigation of logistics management and logistics method in the Chinese non-metallic mineral industry: A Case Study of The Shenzhen Rocky Mountain2013Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The purpose of this thesis is to investigate the risks in logistics management and logistics

    methods for the non-metallic mineral companies. The authors review the current situation of

    logistics management and logistics method from the non-metallic mineral companies and find

    out the problems or risks from these companies. The authors reviewed a few articles that

    evaluate the risks and problems in the non-metallic mineral companies. The authors also had

    several interviews through the Internet with the interviewee, who works as a regional

    manager in the case company. This thesis is a qualitative single case study, the authors search

    for usable information from the Internet, interviews and the authors also review many

    literatures and write about the current situation of the logistics methods, logistics management

    and logistics outsourcing in the non-metallic mineral companies. In the conclusion part, the

    authors give out the answers about the common risks in the literature for logistics

    management and logistics outsourcing, the characteristics of logistics in non-metallic mineral

    companies and the risks and problems of logistics management and logistics outsourcing in

    the non-metallic mineral companies during practice. This part also includes limitation in this

    thesis and it shows the further study, which the authors want to study in the future.

  • 18529.
    Zhuo, Yue
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management.
    Measuring inaccessible points in land surveying and analysis of their uncertainty2012Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
  • 18530.
    Ziakoulis, Antonio
    University of Gävle, Faculty of Engineering and Sustainable Development.
    Ombyggnation, från sågverkslokal till restaurang. antonio ziakoulis2010Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
  • 18531.
    Zineldin, Mosad
    et al.
    Växjö University.
    Philipson, Sarah
    Växjö University.
    Back to the Future : the Era of Relationships2006Conference paper (Refereed)
    Abstract [en]

    During the 1990s, many organizations and consumers experienced great movements and actions. Some key environmental factors provided the setting whereby companies changed their attention and orientation toward marketing and the consumer. Companies have recognized the fact that they must change and restructure their way of establishing and maintaining business relationships. For example, many manufacturers discovered, or more adequately, re-discovered that close relationships with suppliers are invaluable with constantly changing technology and increasing global competition.

    The term relationship marketing has become a buzzword, with the concept being used to reflect a number of differing themes or perspectives, and has become a ”catch-all” phrase. Unfortunately, the roots and the precise meaning of relationship marketing are not always clear in the literature. This paper is part of a long term research effort to provide a deeper insight and understanding of the relationship philosophy. The purpose of the article is to theoretically and conceptually explain the evolution of the Relationship approach, to elaborate on the indispensable role of the traditional marketing mix theory on the development of the relationship management and strategy. The paper also discuss the notion of relationship marketing as a paradigm shift. Our research reveals that the philosophy of viewing marketing as a cross-functional approach or orientation is not a new discovery of the 1980s or 1990s. The paper also argue that, it would be appropriate if we replace the concept relationship marketing with relationship management. This is not just a semantic point, it is an essential distinction which can be strategically significant for the long-term survival of the organization

  • 18532.
    Zineldin, Mosad
    et al.
    School of Management and Economics, Växjö University, Växjö, Sweden.
    Philipson, Sarah
    School of Management and Economics, Växjö University, Växjö, Sweden.
    Kotler and Borden are not dead: myth of relationship marketing and truth of the 4Ps2007In: Journal of Consumer Marketing, ISSN 0736-3761, E-ISSN 2052-1200, Vol. 24, no 4, p. 229-241Article in journal (Refereed)
    Abstract [en]

    Purpose – The purpose of this paper is to verify whether relationship marketing is a new paradigm that has replaced transactional marketing. Design/methodology/approach – A literature and empirical study indicated that relationship marketing is neither an invention of the late twentieth century, nor prevailing in practice. This suggested that rather than a complete paradigm shift, relationship marketing and transactional marketing are complementary. Through interviewing five Scandinavian companies about their marketing priorities, their mix of transactional and relationship marketing approaches was studied.

    Findings – The paper finds that no company exclusively used the relationship marketing approach. Some were merely utilizing the traditional marketing concept of 4Ps; others were blending a relationship and transactional marketing mix. Research limitations/implications – This is a limited study, which calls for further validating. Practical implications – The Kotlerism of the 4Ps is still dominating. Relationship concepts are utilized to some extent. A relationship strategy can be used as a supporting approach. Thus, there is need to blend relationship and transactional marketing mixes.

    Originality/value – The paper argues that the relationship marketing is not a paradigm shift; focus should be on relationship management, not marketing. The paper also shows the complementarities of relationship management and transactional marketing. 

  • 18533.
    Zineldin, Mosad
    et al.
    Linnaeus University.
    Philipson, Sarah
    Linnaeus University.
    Quality, Innovation & Differentiation (QID): A Case Study2007Conference paper (Refereed)
    Abstract [en]

    According to our knowledge, no examination has been made regarding the triangle relationship between Quality, Innovation and Differentiation, QID, and what significance has QID for a firm's competitive position.

    This article aims to theoretically and empirically develop an understanding of the  role of quality, innovation and differentiating in the competitiveness of an organization and proposes a holistic, cross-disciplinary model of the quality, innovation and differentiation QID). A case study shows that linking QID is necessary for sustaining competitive advantage in the hyper-competitive world.  The features and essentials in the attainment of such an approach are tentatively constructed through the total relationship management (TRM) and the 5Qs (five qualities) models. It shows that that QID and competitiveness are all linked. QID and total relationship management are strongly related to competitive advantages.  Thus we argue that TRM can be seen as administrative and process innovation, which facilitate technological innovation.

  • 18534.
    Zingmark, Mikael
    University of Gävle, Faculty of Health and Occupational Studies, Department of Social Work and Criminology, Social Work.
    Ensamhetseffekten: En litteraturstudie i hur känslan av ensamhet påverkar hälsan2019Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Research shows that mental ill-health increases in society and the purpose of the study was to investigate what perceived loneliness means and how it affects the health of the individual. This was done by using the theories SOC (Sense of coherence), attachment theory and Cognitive theory in a literary study of 7 articles. The result shows that perceived loneliness increases the risk of ill health, both physical and mental, and that children and women are more vulnerable. Perceived loneliness in early age increases the risk of depression and suicidal thoughts and perceived loneliness in the elderly contributes to a reduced cognitive function and an increased risk of dementia. 

     

    Conclusion: perceived loneliness is part of the growing mental ill-health in society and the study highlights the importance of addressing the perceived sense of loneliness as early as possible, to avoid further negative health aspects for the individual.

  • 18535.
    Zolotareva, Julia
    et al.
    University of Gävle, Faculty of Education and Business Studies, Department of Business and Economic Studies.
    Gromova, Valentina
    University of Gävle, Faculty of Education and Business Studies, Department of Business and Economic Studies.
    Revisorns anmälningsplikt: Har anmälningsplikt påverkat klientrelationer?2015Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Purpose: The purpose of this study is to create understanding for the law on notification and how the law on the notification has affected the relationship between the auditor and client. A further purpose is to investigate whether auditors inform their clients about the law on notification today.

    Method: The qualitative method has been implemented in this study in the form of interviews. Interviews took place in Gävleborg region with eight authorized auditors and three business managers.

    Conclusions: The current study have shown that the auditors do not inform their clients about the law on the notification even today. The law on the notification has not affected the relationship between auditor and client. According to the approached auditors, the relationship can deteriorate only with the clients that have an unserious attitude. The business managers also believe that the relationship with the auditor hasn’t been affected because of the law on the notification. The study has shown, however, that the law on the notification is being applied differently depending on the size of the company and type of relationship between the parties.

    The study's contribution: This thesis contribute to clarify if the law on the notification has affected the relationship between auditor and client. The study'sresults contribute to business research by creating understanding about the law on the notification's impact on the relationship, which states the resultthat the relationship has not changed. Furthermore, we notice in the study that the size of the company determines what kind of relationship existsbetween the parties, which in turn may affect the auditor's independence.

    Suggestions for further research: There are not many studies that discuss the law on the notification's impact on the relationship between auditor and client from both the auditors and client perspective. It would therefore be interesting to continue on this study, but with a quantitative method. This will make it possible to reach more respondents and to make the study results more generalizable.

  • 18536.
    Zou, Fan
    University of Gävle, Department of Technology and Built Environment.
    Energy Saving Curtain: ENERGY INVENTORY AND CONSERVATION POSSIBILITIES2008Independent thesis Advanced level (degree of Magister), 20 points / 30 hpStudent thesis
    Abstract [en]

    This paper presents the energy saving curtains, in order to make the

    consumers be more aware of the energy efficiency of the energy saving

    curtains, the paper gave related analysis and conclusions.

    The work was performed by using the Parasol Program, developed by Lunds University, Sweden. The Program is used for quantifying the influence of window size, glass type, textile type, wall thermal insulation and sun shading on annual energy use and indoor thermal comfort. The results which are obtained from the calculations are applicable to similar climatic and environment conditions. Calculations were performed to investigate the potential for using sunshade devices to reduce annual energy demand for cooling and heating. Different materials and dimensions of the energy saving

    curtain are used as variables in the analysis. The results indicated that for the current climatic conditions and other related factors, the total reduction rate of the annual energy consumption of office used buildings in Stockholm is estimated generally 20% -30% lower comparing to those buildings without energy saving curtain system. That means at least 20% of energy cost can be saved by the energy saving curtain system.

  • 18537.
    Zou, Rucong
    et al.
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management.
    Sun, Hong
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management.
    Building Extraction in 2D Imagery Using Hough Transform2014Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The purpose of this paper is to find out whether Hough transform if it is helpful to building extraction or not. This paper is written with the intention to come up with a building extraction algorithm that captures building areas in images as accurately as possible and eliminates background interference information, allowing the extracted contour area to be slightly larger than the building area itself. The core algorithm in this paper is based on the linear feature of the building edge and it removes interference information from the background. Through the test with ZuBuD database in Matlab, we can detect images successfully.  So according to this study, the Hough transform works for extracting building in 2D images.

  • 18538.
    Zuber-Namér, Marilis
    University of Gävle, Faculty of Health and Occupational Studies.
    Platsrelaterat själv och autobiografiska minnnen hos svenskar boende i Schweiz2013Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
  • 18539.
    Zumaeta, Eduardo
    University of Gävle, Department of Mathematics, Natural and Computer Sciences.
    Dokumentation för programförändring Carta2007Student paper second term, 10 points / 15 hpStudent thesis
    Abstract [sv]

    Carta är ett datasystem som är skapat av SMS Meer, Tyskland och som används av Rörverk 6 på Ovako i Hofors vid rörtillverknings processen. Systemet är placerat i ett Reducerverk, som man använder till processreglering, för processtyrning av Streckreducerverket, och som processadministration med en Central database för att sköta kommunikation mellan olika datasystem anknutna till Rörverk 6, och som planeringsverktyg för att få fram samtliga data för rörtillverknings processen.

  • 18540.
    ZUO, Tianchi
    et al.
    University of Gävle, Department of Technology and Built Environment.
    LI, Ying
    University of Gävle, Department of Technology and Built Environment.
     Environment-oriented Logistics System Design2009Independent thesis Advanced level (degree of Master (One Year)), 15 credits / 22,5 HE creditsStudent thesis
    Abstract [en]

    Environmental issues have been highly in focus for several years. With the development of EMS, many companies get environmental improvements through implementing EMS. Also, "green logistics" turns out to be a popular issue. But the combination of environment issues and logistics system is rarely found in the previous researches. Therefore, environment-oriented logistics system design becomes the topic described here.

    The purpose of the thesis is to see potential of integrating environment issues into logistic system by literature review and case study. With the help of our supervisors, two Swedish companies Sandvik SMT and FLB Logistik become case companies in the thesis. The analysis is based on literature review about logistics and environment, the information from both companies‟ websites as well as face-to-face interviews.

    In analysis part, how logistics systems and environmental issues interact with each other is illustrated firstly. A proposed model based on logistics system decision-making model is shown. SWOT analysis is used to explain the outcomes and challenges of implementing EMS in Sandvik SMT. At last, the conditions such as customer environmental requirement and the cost for using EMS are briefly described.

    Based on the research, further study should begin with the collection of quantitative data about environmental performance from manufacturing companies, suppliers, as well as retailers. More recommendations are given in the conclusion part.

  • 18541.
    Zutautas, Vaidutis
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management, Land management, GIS.
    Charcoal Kiln Detection from LiDAR-derived Digital Elevation Models Combining Morphometric Classification and Image Processing Techniques2017Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This paper describes a unique method for the semi-automatic detection of historic charcoal production sites in LiDAR-derived digital elevation models. Intensified iron production in the early 17th century has remarkably influenced ways of how the land in Sweden was managed. Today, the abundance of charcoal kilns embedded in the landscape survives as cultural heritage monuments that testify about the scale forest management for charcoal production has contributed to the uprising iron manufacturing industry. An arbitrary selected study area (54 km2) south west of Gävle city served as an ideal testing ground, which is known to consist of already registered as well as unsurveyed charcoal kiln sites. The proposed approach encompasses combined morphometric classification methods being subjected to analytical image processing, where an image that represents refined terrain morphology was segmented and further followed by Hough Circle transfer function applied in seeking to detect circular shapes that represent charcoal kilns. Sites that have been identified manually and using the proposed method were only verified within an additionally established smaller validation area (6 km2). The resulting outcome accuracy was measured by calculating harmonic mean of precision and recall (F1-Score). Along with indication of previously undiscovered site locations, the proposed method showed relatively high score in recognising already registered sites after post-processing filtering. In spite of required continual fine-tuning, the described method can considerably facilitate mapping and overall management of cultural resources.

  • 18542.
    Zäll, Mikael
    University of Gävle, Department of Mathematics, Natural and Computer Sciences.
    Ökade anpassningsmöjligheter med scriptspråk2006Independent thesis Basic level (degree of Bachelor), 10 points / 15 hpStudent thesis
    Abstract [sv]

    Att implementera scriptmotorer i Windows-applikationer öppnar upp många intressanta möjligheter, varav en av dessa är att göra kundanpassningar till ett system utan att kompilera om källkoden. Några problemställningar som skall utvärderas är hur det kan implementeras en scriptmotor till ett affärssystem och vad finns det för färdiga scriptmotorer och scriptspråk som kan användas, och hur det på ett lämpligt sätt kan skapas anropspunkter till script så som händelser, knappar och menypunkter. I denna uppsats ges ett förslag på en möjlighet att anpassa ett affärssystem under dess exekvering genom att integrera en scriptmotor till systemet. Denna teknik kommer att tillåta olika kunder att själva anpassa ett system efter deras egna behov, men dock inom ett visst ramverk. Syftet med detta är att öppna upp möjligheten att skapa egna anpassningar av systemet på ett snabbt och ekonomiskt tillvägagångssätt.

  • 18543.
    Ädel, Eva
    et al.
    University of Gävle, Faculty of Health and Occupational Studies, Department of Health and Caring Sciences, Caring science.
    Löfmark, Anna
    University of Gävle, Faculty of Health and Occupational Studies, Department of Health and Caring Sciences, Caring science.
    Pålsson, Ylva
    University of Gävle, Faculty of Health and Occupational Studies, Department of Health and Caring Sciences, Caring science.
    Mårtensson, Gunilla
    University of Gävle, Faculty of Health and Occupational Studies, Department of Health and Caring Sciences, Caring science.
    Engström, Maria
    University of Gävle, Faculty of Health and Occupational Studies, Department of Health and Caring Sciences, Caring science.
    Lindberg, Magnus
    University of Gävle, Faculty of Health and Occupational Studies, Department of Health and Caring Sciences, Caring science.
    The interaction of peers: promotive and hindering aspects for learning and well-being using peer-learning during clinical education2017In: Article in journal (Other academic)
  • 18544.
    Ädel, Johan
    University of Gävle, Department of Mathematics, Natural and Computer Sciences.
    Kopplingar till vardagsfenomen i fysikläromedel2008Independent thesis Advanced level (professional degree), 10 credits / 15 HE creditsStudent thesis
  • 18545.
    Ädling, Anna
    University of Gävle, Department of Technology and Built Environment.
    Timmerhusets historia och framtid: En studie av timmerhusets energianvändning2008Student paper second term, 10 points / 15 hpStudent thesis
    Abstract [en]

    In a time where our environmental awareness and our use of energy gets more and more attention, grows the demand requirements on all the materials that we use. An area where the focus on etc the energy consumption has increased is the construction industry. With EU´s directive 2002/91/EG the demand energy efficient requirements gets even higher. Even the timberhouse that has traditions for over a 1000 years has to make the demand requirements that we have in the 21-century. Boverket has on the basis of the directive

    established new demands that say that houses located in the northern climate zone gets to have a maximum energy consumption of 130 kWh/year and 110 kWh/year in the southern climate zone.

    Only the 8” timberhouse located in the southern climate zone made the demand requirements on 110 kWh/year.

    The report analyses five different energy saving alternatives;

    • Use of rougher timber

    • Externally addition isolation

    • Internally addition isolation

    • Internally addition isolation of the northern wall and only on thoose walls where the timberwall neverhteless is gonna be visible:

    - Bathroom

    - Kitchen

    • Doubble timberwall with isolation inbetween

  • 18546.
    Äijö, Annika
    University of Gävle, Faculty of Health and Occupational Studies, Department of Occupational and Public Health Sciences.
    Hälsosammare snabbmat – upplevda möjligheter och problem bland restauranger: En intervjuundersökning ur snabbmatsrestaurangers perspektiv2014Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Background: Over the past 30 years the incidence of overweight and obesity has increased. Obesity is a risk factor for many diseases, for instance type 2 Diabetes, cardiovascular diseases, many types of cancer and musculoskeletal diseases. That ready available food today is so accessible can be a reason for the public health problems of overweight and obesity.

    Objective: The aim was to study what possibilities and barriers there are for fast-food restaurants to sell healthy food.

    Methods: Information was collected by seven telephone interviews and two respondents answered by e-mail. Nine persons that were in charge of the menu at different fast-food restaurant chains in Sweden participated in the study.

    Results: To have a large variety was considered to be a problem for selling healthy food, also because the sale of it was low in some of the fast-food chains. Some of the informants did not find any problems with selling healthy food and it was regarded as an opportunity to get more consumers.

    Conclusion: The demand for healthier food has increased, and the offer and sales of it has also escalated. Nevertheless traditional fast food is selling well and that is why most restaurants focus on that range of food rather than offering their costumers healthier options in their menu.

  • 18547.
    Älander, Eva
    University of Gävle, Faculty of Education and Business Studies, Department of Culture Studies, Religious Studies and Educational Sciences.
    De nationella proven i svenska - hur påverkar de undervisningen i årskurs 9?2011Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
    Abstract [sv]

    Älander, Eva (2011): De nationella proven i svenska – hur påverkar de undervisningen i årskurs 9? Examensarbete i didaktik. Lärarprogrammet. Akademin för utbildning och ekonomi. Högskolan i Gävle.

     

    Sammanfattning

    Detta är en studie om det nationella provet i svenska för årskurs 9. Arbetets syfte har varit att undersöka hur några lärare uppfattar att de nationella proven påverkar de prioriteringar som de gör runt ämnets innehåll. Med andra ord: hur de nationella proven påverkar undervisningen i svenska i årskurs 9. Leder proven till att den dagliga undervisningen fokuserar vissa mål på bekostnad av andra mål? Eller är det snarare så att provens existens hjälper till att ställa kursplanens innehåll i fokus på ett sätt som gynnar elevernas måluppfyllelse?

    Undersökningen genomfördes i form av semi-strukturerade intervjuer med fem stycken lärare som i dagsläget undervisar i svenska. Dessa lärare har varit involverade i genomförande och bedömning av nationella prov mellan två och femton gånger. Den intervjuguide som användes berörde två stycken teman; de nationella proven samt kursplanen i svenska och dess skrivningar om ämnets centrala innehåll i årskurs 7-9.

    Årligen genomför cirka 100 000 elever de tre delprov som ingår i det nationella provet i svenska för årskurs 9. Trots att proven inte mäter alla kursplanens mål är de mycket viktiga redskap för lärarnas bedömning och betygssättning. Lärarna i denna studie ser provresultaten som ett mått på (och garant för) sin egen bedömningsnivå, att de hamnat rätt i sin helhetsbedömning av elevens måluppfyllelse.

    Under en längre tid har det konstateras relativt stora avvikelser mellan elevernas provbetyg och deras samlade terminsbetyg. En sådan avvikelse behöver inte alltid vara ett problem, men den kan också visa på att lärares bedömning inte är likvärdig över landet. Problematiken blir extra tydlig när långa texter ska bedömas och bedömningsanvisningarna lämnar stort tolkningsutrymme till den enskilde läraren. Ett arbetssätt som rekommenderas för att råda bot på likvärdighetsproblematiken är sambedömning. Sambedömning problematiseras i denna studies resultat utifrån risken för att skolkulturer skapas samt de tendenser till skillnader i villkor som anas mellan lärare på kommunala respektive fristående skolor.

    Det blir tydligt i denna studies resultat att det nationella provet påverkar undervisningen i relativt stor utsträckning, inte minst genom de grundliga förberedelser som genomförs inför provet. Detta väcker frågor om var gränsen går mellan att ge eleverna så goda förutsättningar som möjligt och att förbereda dem så pass mycket att provresultatet inte säger något om elevens kunskaper utan snarare är en produkt utav en längre tids strategiska förberedelser?

    Nyckelord: bedömning, kursplan, lektionsinnehåll, måluppfyllelse, nationella prov, svenska, årskurs 9

    Keywords: assessment, course syllabi, goal attainment, lesson planning, national tests, Swedish, year 9

  • 18548.
    Älvebrink, Johan
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management.
    Konceptutveckling av artikelpaletter för effektivare rengöring av detaljer2016Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Atlas Copco in Tierp focus its production on hand-held tools, fixtured tools and assembly systems. Examples of tools that the company produces are wrenches, screwdrivers, grinders and drills. The production unit in Tierp is the largest production unit in the Industrial Technique business area. The company manufactures articles in many sizes and shapes. The articles are stored and transported in workshop palettes (load carriers). In order to ensure quality standards the articles are cleaned every so often in large industrial washing machines.The rinsing process is not efficient enough when cleaning the company's smaller articles. Palettes which articles are placed in contributes greatly to the lack of efficiency. To get the articles completely clean rinsing must sometimes be done twice.The goal was to develop a new palette concept that enable increased cleanliness after rinsing.Through trial and error method several alternative concepts have been developed and the best selected using Pugh matrix.The selected concept significantly increases the water flow and detail capacity compared to the original palette, but manufacturing costs are estimated to increase.Depending on the manufacturing method selected for making the new palettes, construction design can part. If the palettes are made through 3D-printing it may be advantageous to reduce the height (possibly remove the support pillars) and the mass of the palette to lessen manufacturing costs, while too complex design can increase the cost of machining.I recommended a prototype of the palette too be tested in production to reliably evaluate its properties and quality.

  • 18549.
    Ämting, Alveola
    University of Gävle, Faculty of Education and Business Studies, Department of Culture Studies, Religious Studies and Educational Sciences.
    "Det ska vara från ens egna känslor och inte från någon annans": Elevers uppfattningar om eget skapande2011Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Syftet med den här uppsatsen var att undersöka hur elever definierar ”eget skapande”, vilket är en term som används i läroplanen för de obligatoriska skolformerna och i kursplanen i bild. Jag har också undersökt om elever på högstadiet håller på med något eget skapande på fritiden och om de tycker att det finns tillräckligt med tid för eget skapande på bilden i skolan.Studien består dels av en enkätundersökning där 84 elever på högstadiet har svarat och dels av intervjuer med fyra av eleverna. Resultatet visar att dessa elever har olika uppfattning om vad som är eget skapande. En stor del av eleverna har använt sig av ordet ”själv” i sina definitioner, antingen i bemärkelsen att man arbetar själv under bildskapandet eller i den mening att man själv kommer på vad som ska skapas. En annan uppfattning som är vanlig bland eleverna är att eget skapande innebär att skapa fritt eller att få göra vad man vill.En stor del av eleverna tycker att det fattas tid till eget skapande på bilden i skolan, men nästan lika många elever tycker att det finns tillräckligt med tid. Många har också svarat att de inte vet.Något som undersökningen också visar är att nästan hälften av eleverna ägnar sig åt någon typ av eget skapande på fritiden. Deras svar visar att eget skapande kan innebära mer än vad som traditionellt behandlas i bildundervisningen. Eleverna inte bara ritar och målar utan fotograferar och redigerar, målar graffiti, skapar musik och webbdesign. De bygger snögubbar, LEGO och EPA. De pysslar och lagar trasiga saker. Allt detta kan enligt eleverna själva vara eget skapande.

  • 18550.
    Ängalid, Filip
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Building, Energy and Environmental Engineering.
    Utredning av behovsstyrd ventilation: En jämförelse mellan CAV och VAV2012Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Denna rapport är ett examensarbete på C-nivå som görs i sammarbete med teknikkonsulten Ramböll. Det vanligaste sättet att ventilera en byggnad idag är med så kallad CAV-ventilation (Constant Air Volume). Denna metod bygger på att ett luftflöde bestäms för rummet och upprätthålls med konstant flöde. En annan metod är så kallad VAV (Variable Air Volume) som bygger på att flödet varierar efter behovet. Anledningen till varför man väljer VAV istället för CAV är att med CAV finns det ofta en stor risk att man överventilerar ett rum eller byggnad, just på grund av att flödet är konstant. Problemet med VAV är att det är en högre investeringskostnad än för CAV så metoden lämpar sig bara där energibesparingen är så stor så den täcker mellanskillnaden i pris. Denna utredning visar i vilka typer av rum som det kan löna sig att installera VAV istället för det traditionella CAV-systemet. För att undersöka detta sker simuleringar av fiktiva modeller i programmet IDA Indoor Climate & Energy (IDA). IDA är ett simuleringsverktyg som används till att simulera den termiska komforten i byggnader samt byggnadens energianvändning. De olika rumstyperna som simuleras är: klassrummet, kontoret och mötesrummet. De olika fallen är utformade så att de liknar så som de ser ut i verkligheten både till geometri och nyttjandegrad. Om något av fallen visade sig vara en bra kandidat för att förse med VAV fortsätter utredningen med att fastställa hur stort bör flödet vara för att energibesparingen ska bli så stor så att det täcker investeringskostnaden. Den ekonomiska kalkyleringen sker både med en livscykelkostnadsanalys och med en enklare återbetalningstidskalkyl. Resultatet för simuleringarna visade att den enda rumstypen i denna utredning som var lönsam var mötesrummet. Klassrummet och kontoret visade sig båda ge en förlust. Detta var eftersom nyttjandegraden för dessa rum var så pass hög så att ventilationen med VAV var igång nästan lika mycket som för CAV. För mötesrummet var nyttjandegraden betydligt lägre vilket innebar att energibesparingen blev så pass hög att den täckte den höga investeringskostnaden. För mötesrummet gjordes sedan en flödesanalys som visade att rummets luftflöde bör vara dimensionerat för mellan omkring 20 – 30 personer för att vara en lönsam investering. 

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