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Improving Fault Detection in Modified Code-A Study from the Telecommunication Industry

Journal of Computer Science & Technology 2007年第3期22卷 397-409页

作者： Piotr Tomaszewski lars lundberg Hkan Grahn School of Engineering Blekinge Institute of Technology SE-372 25 RonnebySweden

Many software systems are developed in a number of consecutive releases. In each release not only new code is added but also existing code is often modified. In this study we show that the modified code can be an important source of faults. Faults are widely recognized as one of the major cost drivers in software projects. Therefore, we look for methods that improve the fault detection in the modified code. We propose and evaluate a number of prediction models that increase the efficiency of fault detection. To build and evaluate our models we use data collected from two large telecommunication systems produced by Ericsson. We evaluate the performance of our models by applying them both to a different release of the system than the one they are built on and to a different system. The performance of our models is compared to the performance of the theoretical best model, a simple model based on size, as well as to analyzing the code in a random order （not using any model）. We find that the use of our models provides a significant improvement over not using any model at all and over using a simple model based on the class size. The gain offered by our models corresponds to 38-57% of the theoretical maximum gain.

关键词： fault prediction metrics testing and debugging

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Experiences of rejection by mental health patients— A qualitative study

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Health 2013年第10期5卷 1553-1560页

作者： Bertil lundberg Pia Lundqvist lars Hansson Elisabet Wentz Bengt Sivberg Department of Health Sciences Faculty of Medicine Lund University Lund Sweden Department of Health Sciences Faculty of Medicine The Swedish Institute for Health Sciences Lund University Lund Sweden Gillberg Neuropsychiatry Centre University of Gothenburg Gothenburg Sweden

Background and aim: People suffering from mental illness and their experiences of attitudes towards them are rarely investigated from the perspective of the individual. The aim was to gain an understanding of how a group of mental health patients experienced social relationships in personal settings as well as in society. Method: Open interviews with twenty-five mental health patients were conducted and analysed with a qualitative content analysis. Result: The essence of the result was that mental health patients’ experiences are still not taken enough into account, neither by mental health professionals nor by their social networks. This was underpinned by four core categories: Patients’ experience of deteriorated and reduced social contacts due to various degrees of acceptance and knowledge of people in general;service users reported on difficulties with social contacts in general, with family relationships, relationships with friends and workmates and with employers;reduced life opportunities were expressed, including violated self-image and poor coping competence and, ambivalent experiences of contact with the mental health services were reported. Conclusion and clinical implication: The present study contributes to the understanding of mental health patients’ experiences of professional services and of their social networks. This knowledge may strengthen the implications of patient-centred care essential for the outcome of the care.

关键词： Mental Health Patients Experiences Stigma Attitudes Qualitative Interviews Society Family

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