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  • 251.
    von Haartman, Robin
    et al.
    University of Gävle, Department of Technology and Built Environment, Ämnesavdelningen för industriell ekonomi. University of Gävle, Center for Logistics and Innovative Production.
    Bengtsson, Lars
    University of Gävle, Department of Technology and Built Environment, Ämnesavdelningen för industriell ekonomi. University of Gävle, Center for Logistics and Innovative Production.
    Manufacturing competence: A key to successful supplier integration2009In: International Journal of Manufacturing Technology and Management (IJMTM), ISSN 1368-2148, E-ISSN 1741-5195, Vol. 16, no 3, p. 283-299Article in journal (Refereed)
    Abstract [en]

    Extensive involvement of suppliers in new product development and manufacturing development has often been associated with superior performance. Some authors have also alleged that companies need comprehensive internal competencies, or absorptive capacity, in order to fully benefit from external expertise. This paper analyses this relationship on an operational level in manufacturing companies. Based on a large-scale survey it is shown that companies with greater internal manufacturing competencies gain significantly from supplier involvement in terms of most performance indicators, whereas those with lesser internal competencies have little to gain from such external cooperation.

  • 252.
    von Haartman, Robin
    et al.
    University of Gävle, Department of Technology and Built Environment, Ämnesavdelningen för industriell ekonomi. University of Gävle, Center for Logistics and Innovative Production.
    Bengtsson, Lars
    University of Gävle, Department of Technology and Built Environment, Ämnesavdelningen för industriell ekonomi.
    Manufacturing competence and external integration: absorptive capacity in a first tier supplier2007Conference paper (Refereed)
  • 253.
    von Haartman, Robin
    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.
    Bengtsson, Lars
    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.
    Sustainable global purchasing: assessing the relative impact of sustainability goals and programs2018In: International Journal of Business Performance Management, ISSN 1368-4892, E-ISSN 1741-5039, Vol. 19, no 2, p. 169-188Article in journal (Refereed)
    Abstract [en]

    Global purchasing and offshoring are established strategic means for lowering costs and improving competitiveness. However, firms purchasing globally have also been accused of committing, supporting or just turning a blind eye to a number of environmental and social misdemeanours, such as disregard for environmental regulation, poor working conditions and corruption. The purpose of this paper is to provide quantitative evidence, based on a large scale survey, on how global purchasing actually impacts sustainability performance. The paper finds that there are no significant differences in sustainability performance between firms purchasing globally and firms purchasing regionally. However, firms purchasing globally are significantly more likely to fulfil their sustainability goals compared to firms purchasing regionally. Moreover, only firms that purchase globally show a significant impact of sustainability programmes on supplier sustainability compliance. Global purchasing can thus aid in social and environmental responsibility if it is accompanied by ambitious sustainability targets and sustainability programmes.

  • 254.
    von Haartman, Robin
    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.
    Bengtsson, Lars
    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.
    The impact of global purchasing and supplier integration on product innovation2015In: International Journal of Operations & Production Management, ISSN 0144-3577, E-ISSN 1758-6593, Vol. 35, no 9, p. 1295-1311Article in journal (Refereed)
    Abstract [en]

    Purpose – The interest in global purchasing has increased significantly in recent years, but the impact on product innovation is not well understood. The purpose of this paper is to empirically analyse the impact of global purchasing on product innovation sourced from suppliers, while taking into account how firms integrate their suppliers.

    Design/methodology/approach – The data used in this study are from the International Purchasing Survey, an international online survey on purchasing and supply management conducted in 2009. The data are analysed using factor and regression analyses.

    Findings – The paper shows that global purchasing has no direct impact on product innovation performance. However, supplier integration is more strongly associated with product innovation performance for firms purchasing globally compared to firms purchasing regionally.

    Practical implications – The implication is that when companies purchase globally, they must have a highly developed purchasing department in order to sustain a high level of innovation. For firms purchasing only regionally, the role of the purchasing department is diminished, at least in terms of contributing to innovation.

    Originality/value – This paper contributes to the discussion of potential advantages and disadvantages of global purchasing. First, the paper provides an explanation for the ambiguous results of previous research. Product innovation does not depend on whether firms are purchasing globally or not, it depends on how they purchase. This paper has showed that when purchasing globally, the role of the purchasing department becomes crucial for product innovation. The proficiency and activities of the purchasing department largely determine the success, in terms of supplier product innovation, of global purchasing.

  • 255.
    von Haartman, Robin
    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.
    Bengtsson, Lars
    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.
    Niss, Camilla
    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.
    Digital or lean? Lean practices and adoption of digital technologies in assembly- and process-based industries2016Conference paper (Refereed)
  • 256.
    von Haartman, Robin
    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.
    Bengtsson, Lars
    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.
    Niss, Camilla
    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.
    Lean Practices and the Adoption of Digital Technologies in Production2019In: International Journal of Services and Operations Management, ISSN 1744-2370Article in journal (Refereed)
    Abstract [en]

    The use of Lean principles has long enabled the improvement of efficiency and competitiveness in manufacturing firms, but during the last decade, advanced digital and automated solutions have been more in the spotlight. It has been suggested by some authors that Lean and digitalisation are mutually exclusive, although most authors now agree that the two are indeed compatible. It thus seems that the most urgent question is not whether Lean and digital technologies can be combined, but rather how. This paper uses a large-scale survey of manufacturing units in Europe to explore the relationship between three types of Lean production practices and the use of digital technologies in production. The analysis shows that three types of Lean practices – Lean flow, Lean work organisation and Lean human resource management – are strongly associated with firms’ adoption of digital technologies in production by manufacturing firms. Based on the results it is suggested that, as a theoretical explanation, a firm’s experience of Lean may act as an absorptive capacity when adopting digital technologies. A number of practical explanations are also provided, e.g., that systematic improvement efforts are also beneficial when implementing digital technologies.

  • 257.
    von Haartman, Robin
    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.
    Bengtsson, Lars
    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.
    Niss, Camilla
    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.
    Lean practices as requisites for the use of digital technology in production2016In: Proceedings of the 23rd EurOMA conference: Trondheim, 2016Conference paper (Refereed)
    Abstract [en]

    Lean production principles has for a long time been hailed as a solution for improving efficiency and competitiveness in manufacturing firms. Recently, however, advanced digital solutions have received more space in the spotlight. Does this mean that the era of Lean is over or just changed character? The purpose of this paper is to, based on a large scale survey of manufacturing units in Europe, explore the relationship between the use of Lean production practices and the technological practices associated with the use of digital technologies in production. The study shows that lean practices are strong predictors of firms’ introduction of digital technologies in production by manufacturing firms. The results indicate that lean, as defined in this paper, may indeed be a prerequisite for digital technologies used in production.

  • 258.
    von Haartman, Robin
    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.
    Lozano, Rodrigo
    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.
    Öberg, Jakob
    Pettersson, Alexander
    Improving job engagement:: A survey of blue- and white-collar workers in an medium-sized manufacturing firm2018In: Proceedings of the 25th annual EurOMA conference, Budapest: International Annual EurOMA Conference, 2018Conference paper (Refereed)
    Abstract [en]

    Work engagement is important as it contributes performance. Previous studies have shown that blue-collar workers are less engaged than white-collar workers, which highlights the need to focus on ways to improve the work engagement of blue-collar workers. This paper tests whether different perceptions of job resources is an important driver of the differences in work engagement between white and blue-collar workers. Using a survey of 153 workers in a medium-sized manufacturing firm, the paper shows that job resources, especially work environment and career opportunities, have a great potential to increase the work engagement of blue-collar workers.

  • 259.
    von Haartman, Robin
    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. Private person.
    Sammalisto, Kaisu
    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.
    Lozano, Rodrigo
    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.
    Blomqvist, Per
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management, Mechanical Engineering.
    A Longitudinal Comparison of Sustainability Learning between Men and Women in Engineering and Nursing Programmes2017In: Sustainability, ISSN 2071-1050, E-ISSN 2071-1050, Vol. 9, no 8, article id 1464Article in journal (Refereed)
    Abstract [en]

    For many years, Higher education institutions have been engaging with sustainability, many focussing on environmental ones. In this context, two phenomena have arisen that have, usually, been studied separately: (1) engineering schools have been at the forefront of sustainability efforts; and (2) women have tended to be more concerned about of environmental sustainability than men are. This paper is aimed at analysing the differences in perception between engineering students and nursing students at the University of Gävle, Sweden. Engineering and nursing programmes are practice-oriented with different foci on sustainability and usually being dominated by male and female students, respectively. The data for this article were based on two surveys carried out during 2010 and 2013, in which the same students answered the same questions at the beginning and at the end of their studies. Principal component analysis and regressions were carried out to analyse the survey answers. The results show that engineering programmes and gender affect actions positively. The results also show that engineering students increased their sustainability performance significantly more than nursing students. To improve environmental sustainability, it is important to promote the presence of women in engineering schools, and at the same time, social science oriented programmes (such as nursing) could learn from the efforts and action taken by engineering schools, so that sustainability is taught and learnt in a more holistic way.

  • 260.
    von Haartman, Robin
    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. Private person.
    Wang, Weihong
    Bengtsson, Lars
    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.
    Niss, Camilla
    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.
    Herdin, Gunnar
    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.
    One size does not even fit one:: Supply chain strategies in the decline phase2020In: International Journal of Manufacturing Technology and Management (IJMTM), ISSN 1368-2148, E-ISSN 1741-5195, Vol. 34, no 01, p. 25-45Article in journal (Refereed)
    Abstract [en]

    Given that aligning supply chain strategies with changing productcharacteristics across the phases of the product life cycle is increasinglyimportant, this study investigates the changes in supply and demand uncertaintywhen a product enters the decline phase and how these changes in turn affectthe supply chain strategies applied. Based on four case studies, the analysisreveals that the uncertainties increase in three of four cases when the productenters the decline phase, and that the type of uncertainty, as well as the relatedchallenges, depends on the product’s initial uncertainty of supply and demand.This implies that companies need to redesign their supply chain strategiestowards either more lean or more agile supply chains, or combinations thereof,when the products are declining.

  • 261.
    Walldius, Åke
    et al.
    Centre for User Oriented IT Design, Royal Institute of Technology, Stockholm, Sweden.
    Sundblad, Yngve
    Centre for User Oriented IT Design, Royal Institute of Technology, Stockholm, Sweden.
    Bengtsson, Lars
    University of Gävle, Department of Technology and Built Environment, Ämnesavdelningen för industriell ekonomi. University of Gävle, Center for Logistics and Innovative Production.
    Sandblad, Bengt
    Department of Human Computer Interaction, Uppsala University, Uppsala, Sweden.
    Gulliksen, Jan
    Department of Human Computer Interaction, Uppsala University, Uppsala, Sweden.
    User certification of Workplace Software: Assessing both Artefact and Usage2009In: Behavior and Information Technology, ISSN 0144-929X, E-ISSN 1362-3001, Vol. 28, no 2, p. 101-120Article in journal (Refereed)
    Abstract [en]

    This article summarises activities and results from the quality assessment project 'Quality Assurance of IT Support at Work' (ITQ) which has been performed by Swedish researchers in close cooperation with trade unions 1999-2005. The ITQ project is part of a network, UsersAward, which works for the goal to develop and implement a strategy for good software products on the work floor. A main result of the ITQ project is the first version of a software certification programme, User Certified 2002, which is described in some detail. The underlying theoretical arguments for its design and the performed pilot projects which have informed its implementation are also presented. The outcome of performed certifications is discussed in terms of stakeholder response; in terms of whether to certify artefact, processes, or both; and in terms of the relationship between software certification, standardisation, and public procurement agreements. One conclusion from the project is that a viable software certification programme has to cover the software's built-in features, its deployment process, and its actual situated usage. A second conclusion is that the buying organisation has to implement integrative processes in which its organisational development and its implementation of IT systems are coordinated. Conclusions are also drawn with respect to the set of organisational patterns underlying the UsersAward initiative-certifications, user panels, user surveys, user conferences and a yearly IT Prize contest. Finally, implications and plans for the future, especially international research and union cooperation activities, and further development of the certification process are described.

  • 262.
    Wang, Weihong
    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.
    Bengtsson, Lars
    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.
    Niss, Camilla
    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.
    Herdin, Gunnar
    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.
    Supply Chain Strategies Beyond The Peak2013In: Proceedings of the 20th International AnnualEurOMA conference, Dublin, Ireland, 9-12 June 2013, 2013Conference paper (Refereed)
    Abstract [en]

    When customer demand becomes increasingly volatile and product life cycle shortens, a capability to dynamically adjust the supply chain during the product life cycle becomes more urgent. The study’s purpose is to extend knowledge of dynamic supply chain design and management when the product is in the decline phase of its life cycle. A case study from a global telecom company reveals several challenges for supply chain management and solutions for handling these challenges when a product is beyond the peak. The findings are summarized in a tentative model that specifies supply chain challenges and strategies over the life cycle.

     

    Keywords: Supply chain strategy, product life cycle, decline phase

  • 263.
    Wang, Weihong
    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.
    Bengtsson, Lars
    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.
    Niss, Camilla
    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.
    Herdin, Gunnar
    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.
    von Haartman, Robin
    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.
    Aligning supply chain strategies with products uncertainties in the decline phase2014In: Proceedings of the 21th Euroma conference, 20-25 June, Palermo, 2014Conference paper (Refereed)
  • 264.
    Wang, X.
    et al.
    Reliability Engineering Research Center of Guizhou Province, Guizhou University, China.
    Yang, J.
    Reliability Engineering Research Center of Guizhou Province, Guizhou University, China.
    Gong, M.
    Reliability Engineering Research Center of Guizhou Province, Guizhou University, 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. Reliability Engineering Research Center of Guizhou Province, Guizhou University, China.
    Reliability analysis and evaluation of gas supply system2009In: ICMET'09 - Proceedings of the 2009 International Conference on Mechanical and Electrical Technology, Beijing, 2009, p. 245-249Conference paper (Other academic)
    Abstract [en]

    In this paper, the reliability model and the evaluation methods were neatly used with combining the engineering practice of the noise laboratory supply system, and this study give a quantitative evaluation result of the reliability system. It provides the scientific basis for improving the engineering design and increasing the reliability. This research results can be extended to similar projects, such as fuel supply system. From an engineering point of view, it is an innovation that the filter in the system is identified to be a "series - parallel mixed" structure by considering its physical structure and performance requirement.

  • 265.
    Wang, Yuli
    et al.
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management.
    Qu, Yulan
    University of Gävle, Center for Logistics and Innovative Production.
    Structural Project Need Good Communication2011Independent thesis Advanced level (degree of Master (One Year)), 60 credits / 90 HE creditsStudent thesis
    Abstract [en]

    This thesis studys how work breakdown structure (WBS) in project planning could be of help for the case project. Moreover, and also want to analyze if and how This thesis aims to study how work breakdown structure (WBS) in project planning could be of help for the case project. Moreover. Finally it also analyzes if and how communication could be of help to solve delay problems by the use of WBS. All study is based on the theories of project management and communication. Case is from the real project of a recycle company in China.

  • 266.
    Wlazlak, Paraskeva
    et al.
    Department of Industrial Product Development, Production and Design, School of Engineering, Jönköping University, Jönköping, Sweden.
    Säfsten, Kristina
    Department of Industrial Product Development, Production and Design, School of Engineering, Jönköping University, Jönköping, Sweden and School of Innovation, Design; Engineering, Mälardalen University, Eskilstuna, Sweden.
    Hilletofth, Per
    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. Department of Supply Chain and Operations Management, School of Engineering, Jönköping University, Jönköping, Sweden.
    Original equipment manufacturer (OEM)-supplier integration to prepare for production ramp-up2019In: Journal of Manufacturing Technology Management, ISSN 1741-038X, E-ISSN 1758-7786, Vol. 30, no 2, p. 506-530Article in journal (Refereed)
    Abstract [en]

    Purpose

    Although prior research provides evidence that production ramp-up is often disrupted by supplier-related problems, it fails to discuss how the original equipment manufacturer (OEM) and various types of suppliers integrate their functions and operations to secure preparations for production ramp-up. The purpose of this paper is to investigate OEM-supplier integration in a new product development (NPD) project to prepare for production ramp-up.

    Design/methodology/approach

    The results presented in this paper are based on a real-time, longitudinal study of a single collaborative NPD project in the mechanical engineering industry. The NPD project involves seven suppliers and it is carried out in a large Swedish company (the OEM) and fits the theory-elaborating approach of this research.

    Findings

    This study argues that the aspect of timing in OEM-supplier integration, the OEM's research and development (R&D) attitude toward collaboration and the OEM's (R&D) operating procedure are challenges affecting the preparation for production ramp-up. The following three mechanisms to facilitate OEM-supplier integration in order to prepare for production ramp-up are also discussed: the mediator's role, the OEM's face-to-face meeting at the project level and suppliers? formal face-to-face meetings with the OEM and internally.

    Originality/value

    This paper elaborates on and extends prior research on production ramp-up by conducting an empirical analysis that incorporates supplier integration in NPD. It bridges the gap between the literature on production ramp-up and on supplier integration in NPD and clearly indicates that supplier integration is an important prerequisite for successful production ramp-up.

  • 267.
    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.

  • 268.
    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)
  • 269.
    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.

  • 270.
    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. 

  • 271.
    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.

  • 272. 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.

  • 273.
    Yongjin, Zhang
    et al.
    Department of Civil Aviation Engineering, College of Civil Aviation, Nanjing University of Aeronautics and Astronautics, Nanjing, China; Department of Applied Mathematics, School of Mathematics and Physics, Anhui University of Technology, Maanshan, China.
    Youchao, Sun
    Department of Civil Aviation Engineering, College of Civil Aviation, Nanjing University of Aeronautics and Astronautics, Nanjing, China.
    Longbiao, Li
    Department of Civil Aviation Engineering, College of Civil Aviation, Nanjing University of Aeronautics and Astronautics, Nanjing, China.
    Ming, Zhao
    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.
    Copula-based reliability analysis for a parallel system with a cold standby2018In: Communications in Statistics - Theory and Methods, ISSN 0361-0926, E-ISSN 1532-415X, Vol. 47, no 3, p. 562-582Article in journal (Refereed)
    Abstract [en]

    The traditional reliability models cannot well reflect the effect of performance dependence of subsystems on the reliability of system, and neglect the problems of initial reliability and standby redundancy. In this paper, the reliability of a parallel system with active multicomponents and a single cold-standby unit has been investigated. The simultaneously working components are dependent and the dependence is expressed by a copula function. Based on the theories of conditional probability, the explicit expressions for the reliability and the MTTF of the system, in terms of the copula function and marginal lifetime distributions, are obtained. Let the copula function be the FGM copula and the marginal lifetime distribution be exponential distribution, a system with two parallel dependent units and a single cold-standby unit is taken as an example. The effect of different degrees of dependence among components on system reliability is analyzed, and the system reliability can be expressed as the linear combination of exponential reliability functions with different failure rates. For investigating how the degree of dependence affects the mean lifetime, furthermore, the parallel system with a single cold standby, comprising different number of active components, is also presented. The effectiveness of the modeling method is verified, and the method presented provides a theoretical basis for reliability design of engineering systems and physics of failure.

  • 274.
    Zhang, Yongjin
    et al.
    College of Aerospace Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, China; School of Mathematics and Physics, Anhui University of Technology, Maanshan, China.
    Sun, Youchao
    College of Aerospace Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, 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.
    A combinatorial estimation approach for storage reliability with initial failures based on periodic testing data2017In: Communications in statistics. Simulation and computation, ISSN 0361-0918, E-ISSN 1532-4141, Vol. 46, no 4, p. 3319-3340Article in journal (Refereed)
    Abstract [en]

    Storage reliability that measures the ability of products in a dormant state to keep their required functions is studied in this paper. Unlike the operational reliability, storage reliability for certain types of products may not be always 100% at the beginning of storage since there are existing possible initial failures that are normally neglected in the models of storage reliability. In this paper, a new combinatorial approach, the non-parametric measure for the estimates of the number of failed products and the current reliability at each testing time in storage, and the parametric measure for the estimates of the initial reliability and the failure rate based on the exponential reliability function, is proposed for estimating and predicting the storage reliability with possible initial failures. The proposed method has taken into consideration that, the initial failure and the reliability testing data before and during the storage process, are available for providing more accurate estimates of both initial failure probability and the probability of storage failures. When storage reliability prediction that is the main concern in this field should be made, the non-parametric estimates of failure numbers can be used into the parametric models for the failure process in storage. In the case of exponential models, the assessment and prediction method for storage reliability is provided in this paper. Finally, numerical examples are given to illustrate the method. Furthermore, a detailed comparison between the proposed method and the traditional method, for examining the rationality of assessment and prediction on the storage reliability, is presented. The results should be useful for planning a storage environment, decision-making concerning the maximum length of storage, and identifying the production quality.

  • 275.
    Zhang, Yongjin
    et al.
    School of Mathematics and Physics, Anhui University of Technology, Maanshan, 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.
    Zhang, Shitao
    School of Mathematics and Physics, Anhui University of Technology, Maanshan, China.
    Wang, Jiamei
    School of Mathematics and Physics, Anhui University of Technology, Maanshan, China.
    Zhang, Yanjun
    College of Mechanical Engineering, Yangzhou University, Yangzhou, China.
    An integrated approach to estimate storage reliability with initial failures based on E-Bayesian estimates2017In: Reliability Engineering & System Safety, ISSN 0951-8320, E-ISSN 1879-0836, Vol. 159, p. 24-36Article in journal (Refereed)
    Abstract [en]

    Storage reliability that measures the ability of products in a dormant state to keep their required functions is studied in this paper. For certain types of products, Storage reliability may not always be 100% at the beginning of storage, unlike the operational reliability, which exist possible initial failures that are normally neglected in the models of storage reliability. In this paper, a new integrated technique, the non-parametric measure based on the E-Bayesian estimates of current failure probabilities is combined with the parametric measure based on the exponential reliability function, is proposed to estimate and predict the storage reliability of products with possible initial failures, where the non-parametric method is used to estimate the number of failed products and the reliability at each testing time, and the parameter method is used to estimate the initial reliability and the failure rate of storage product. The proposed method has taken into consideration that, the reliability test data of storage products containing the unexamined before and during the storage process, is available for providing more accurate estimates of both the initial failure probability and the storage failure probability. When storage reliability prediction that is the main concern in this field should be made, the non-parametric estimates of failure numbers can be used into the parametric models for the failure process in storage. In the case of exponential models, the assessment and prediction method for storage reliability is presented in this paper. Finally, a numerical example is given to illustrate the method. Furthermore, a detailed comparison between the proposed and traditional method, for examining the rationality of assessment and prediction on the storage reliability, is investigated. The results should be useful for planning a storage environment, decision-making concerning the maximum length of storage, and identifying the production quality.

  • 276.
    Zhang, Yongjin
    et al.
    Anhui University of Technology.
    Zhao, Ming
    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.
    Zhang, Yanjun
    Yangzhou University.
    Pan, Ruilin
    Anhui University of Technology.
    Cai, Jing
    Guizhou Minzu University.
    Dynamic and steady-state performance analysis for multi-state repairable reconfigurable manufacturing systems with buffers2020In: European Journal of Operational Research, ISSN 0377-2217, E-ISSN 1872-6860, Vol. 283, no 2, p. 491-510Article in journal (Refereed)
    Abstract [en]

    Reconfigurable manufacturing systems (RMSs) are considered the solution of choice when variable production capacity and functionality are required. A combinational approach, which integrates the steady-state probabilities of repairable reconfigurable machine tools (RMTs) and inventory-state probabilities of buffers through an improved universal generating function, is introduced in this study to assess the compound performance indicators (CPIs) of a repairable RMS. This paper contributes to the existing literature by considering the availability of buffers to calculate the CPIs of an RMS. In the proposed approach, the dynamic-state probability for each RMT is determined with a homogeneous continuous-time Markov model, and steady-state probability is obtained as the limit of the dynamic probability as time tends to infinity. In addition, a descriptive input-output information flow, which combines the conveying processes of the machined parts through buffers with the Poisson process, is proposed to determine the inventory-state probabilities of the buffers. Moreover, the explicit expressions of the CPI and expected performance rate (for the RMS and its constituent RMTs) are determined, and the validation procedure and technical details of the performance analysis for the Monte Carlo simulation are presented. Finally, a non-serial, repairable, multi-state RMS with multiple buffers that produces three types of engine cylinder heads is presented to validate the proposed approach. The simulation results verify the accuracy of the performance assessment of the RMS. It is useful for performance improvement in terms of machine reliability, resource utilisation efficiency, and decision-making concerning the configuration of RMS with buffers.

  • 277. Zhao, B.
    et al.
    Yang, J. F.
    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.
    Li, Q.
    Liu, Y.
    A NHPP-based reliability model of wireless sensor networks2014In: Applied Mechanics and Materials: Volume 596: Mechatronics and Industrial Informatics II / [ed] Prasad Yarlagadda and Seung-Bok Choi, 2014, p. 877-882Conference paper (Refereed)
    Abstract [en]

    As the Wireless Sensor Networks(WSNs) are widely applied to various fields recent years, the quality of WSN has been increasingly concerned. Since reliability is the most important factor of quality, how to evaluate reliability of WSN through failure counting is our main subject. In this paper, we try to utilize NHPP theorem in the failure process of WSN and propose a reliability model based on NHPP. And also, the model validation is conducted by simulation. 

  • 278. Zhao, B.
    et al.
    Yang, J. F.
    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.
    Li, Q.
    Liu, Y.
    An additive NHPP-Based reliability model of wireless sensor networks2014In: Applied Mechanics and Materials: Volumes 602 - 605: Advanced Manufacturing and Information Engineering, Intelligent Instrumentation and Industry Development, 2014, p. 3206-3212Conference paper (Refereed)
    Abstract [en]

    As the Wireless Sensor Networks(WSNs) are widely implemented in various fields recent years, the quality of WSNs has been increasingly concerned. WSNs can usually be divided into sub-nets, which assumed to work or fail independently. Through the failure data of those sub-nets, the additive NHPP model for reliability evaluation is composed, and then the maximum likelihood estimation is applied to estimate the unknown parameters in the model. Finally, the simulation shows that the additive NHPP model is better than general NHPP model under certain circumstances. 

  • 279.
    Zhao, B.
    et al.
    Beijing University of Posts and Telecommunications, Beijing, China .
    Yang, J.
    Guizhou Institute of Technology, Guiyang, 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.
    Li, Q.
    Beijing University of Posts and Telecommunications, Beijing, China .
    Liu, Y.
    Beijing University of Posts and Telecommunications, Beijing, China .
    Wireless sensor network reliability modelling based on masked data2015In: International Journal of Sensor Networks (IJSNet), ISSN 1748-1279, E-ISSN 1748-1287, Vol. 17, no 4, p. 217-223Article in journal (Refereed)
    Abstract [en]

    This paper studies the reliability modelling of wireless sensor networks (WSNs) with the masked data that are often observed in practice. The masked data are the system failure data when exact subsystems or components causing system failures cannot be identified. When the masked data are observed, however, it is difficult to estimate the WSN reliability since the failure processes of the subnets cannot be decomposed into simple subsystem processes. In this paper, an additive non-homogeneous poisson process (NHPP) model is proposed to describe the failure process of the WSN with subnets. The maximum likelihood estimation (MLE) procedure is developed to estimate the parameters in the proposed model. By applying the given procedure, the WSN reliability estimate can be relatively easy to obtain. A numerical example based on simulation data with random masking is also provided to illustrate the applicability of the methodology. 

  • 280.
    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)
  • 281.
    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)
  • 282.
    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. 

  • 283.
    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.

  • 284.
    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.

  • 285.
    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.

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