ISSN:0748-8017    

DOI:10.1002/qre.4680100302

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1994

数据来源: WILEY

ISSN:0748-8017    

DOI:10.1002/qre.4680100303

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1994

数据来源: WILEY

摘要:

AbstractReliability engineering is responding to the trend to computer‐aided design (CAD), and the current emphasis on improving competitiveness through quality. Islands of automation addressing reliability for both hardware design and software engineering exist which are not yet connected, though government–industry teams are developing integrated software packages of reliability (and maintainability) tools. TQM (total quality management) principles are being adopted in many industries, and the U.S. Qualified Manufacturers List (QML) programme, which requires qualification of a process rather than a product, is now used for procuring microcircuits. However, government regulations remain a barrier to creating a ‘quality culture’. ISO 9000 is seen by industry as a requirement for international competitiveness, but criticized by some as counterproductive. Research and development of reliability engineering tools reflect the need for implementation in CAD frameworks, and fuzzy logic analysis has attracted the attention of the th

ISSN:0748-8017    

DOI:10.1002/qre.4680100304

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1994

数据来源: WILEY

摘要:

AbstractThe paper examines the research needed to advance the science of Q&R and in particular looks at that required to overcome the present crisis in reliability prediction and assessment. Areas requiring special attention are methods for the objective grading of product and organizational quality, research into human error causes and prevention, better modelling of reliability for prediction purposes, the discovery and use of unreliability diagnostic parameters, and better understanding and application of accelerated testing. Accelerated testing, screening and reliability prediction should all be more failure‐mode‐specific than they are currently. Reliability physics should pay increased attention to the precise effect material and geometric defects have on device l

ISSN:0748-8017    

DOI:10.1002/qre.4680100305

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1994

数据来源: WILEY

ISSN:0748-8017    

DOI:10.1002/qre.4680100306

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1994

数据来源: WILEY

ISSN:0748-8017    

DOI:10.1002/qre.4680100307

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1994

数据来源: WILEY

ISSN:0748-8017    

DOI:10.1002/qre.4680100308

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1994

数据来源: WILEY

ISSN:0748-8017    

DOI:10.1002/qre.4680100309

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1994

数据来源: WILEY

摘要:

AbstractThis paper gives an overview of some methods and procedures used to assure product reliability within Ericsson Telecom AB. The main focus in this paper is on hardware (HW) reliability at board and component level. The evolution of customer–vendor relations over the years is addressed. Some new concepts in complex component reliability assurance are described. Experience from field service is summarized.This information is open and may be subject to change at any tim

ISSN:0748-8017    

DOI:10.1002/qre.4680100310

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1994

数据来源: WILEY

摘要:

AbstractThis paper describes analyses of reliabilities of local area networks (LANs) designed according to the most common IEEE 802 standards: the token ring architecture (IEEE 802.5, basically the IBM token ring architecture), carrier sense multiple access/collision detection (CSMA/CD) bus architecture (IEEE 802.3, basically the Ethernet architecture) and token bus architecture (IEEE 802.4, the recommended LAN architecture for the manufacturing atomation protocol, MAP). Each of these architectures is assumed to be implemented using electrical conductors; newer architectures using fibre optics (such as FDDI) are currently being studied.The primary reliability parameter studied is average source‐destination availability. The models are based on information in the standards plus implementation details, using more implementation details than previous reliability models. Approximate analyses, which reflect all architecture details that appear to be pertinent to availability, have been developed, rather than exact analyses which ignore fine details. One conclusion is that details neglected in previous models have major effects on, and may be the most important factors determining, source–destination availability. At present, no measured values for the relevant parameters are obtainable, however, so all of our computations are based on arbitrary ‘guesstimates’ of these parameter values.A few other conclusions can be reached. Since major components of the bus networks (CSMA/CD and token bus) are similar, reliabilities of these networks are also similar, with differences determined primarily by differences in parameters. Adequate data to describe these differences were not obtainable, so our example computations for the two bus networks yield essentially the same results. Although its use of an active communications medium, instead of the passive bus used by the other architectures, may decrease reliability of the token ring, the token ring architecture gives more flexibility in bypassing or recovering from error situations. In some situations this could make the token ring the most reliable LAN, but ‘reasonable’ choices of parameter values could make any of the LANs most reliable. If many stations are inactive, however, any reliability advantage for token rings would be eliminated by even a small probability that inactive stations are not successfu

ISSN:0748-8017    

DOI:10.1002/qre.4680100311

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1994

数据来源: WILEY