ISSN:0748-8017    

DOI:10.1002/qre.4680010402

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

年代:1985

数据来源: WILEY

摘要:

AbstractThis paper presents a practical method for managing and predicting the yield of VLSI products, in a manner that will provide insight, with a minimum of mathematical complexity, into the sensitivity of the yield to the different quantities which limit it. The yield equation is cast into a form which makes evident the contributions of its constituent terms and the formulation is developed in a manner that permits its ready application to yield characterization, diagnostics and prediction. An illustrative example is presented that integrates the concepts and methods developed.

ISSN:0748-8017    

DOI:10.1002/qre.4680010403

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

年代:1985

数据来源: WILEY

摘要:

AbstractAs competition for world markets becomes more intense and as greater demands are placed on human and natural resources, manufacturers face a formidable challenge — to produce cost competitive products of the highest possible quality.Nowadays the quality control (quality assurance) department can spend incredibly large amounts of time just collecting the test data they need in order to do their job. Collating and analysing the data is similarly very demanding in terms of how much human time can be expended. Simplification and automation of the tasks of data collection, collation and analysis is possible with a quality control information system.A microprocessor can form the basis of a quality control information system if application to only a very small area of a manufacturing operation is desired. However, far greater benefits can be derived if a real‐time minicomputer is used instead of a microprocessor. This is because quality control data can then be collected across the entire factory floor. Statistical quality control techniques can subsequently be applied to examine the effect of process conditions in some part of the factor on product malquality exhibited in any other part of the factory. ‘What‐if’ type analyses can also be conducted factory wide.A quality control information system should be capable of(a) identifying the product quality problems(b) determining the causes of these product quality problems(c) helping to eliminate the causes(d) monitoring the altered process.These system functions enable the quality control department to progress from a ‘fix‐the‐product’ mode to a ‘fix‐the‐process’ mode and thereby concentrate on making the product right in the first place, by achieving better control of the manufacturing process.Application software packages are now available which have been purpose‐designed for quality control information systems. One such example is the Quality Decision Management (QDM) software package from Hewlett‐Packard, which runs on an industrial HP 1000 real‐time minicomputer. On the data entry side a quality control information system should be capable of manual input from menu‐driven terminals and bar‐code wands. Automatic input of test data is also vitally important. This enables such devices as analysers, test instruments, data acquisition units. ATE and other computers to be interfaced to gather test data with no manual intervention. All collected data should be held in a database. The QDM database can be searched to generate a wide range of reports in tabular or colour graphic form, the latter include histograms, scattergrams, control charts (X‐bar, sigma), P‐charts and Pareto diagrams. The reports enable crucial quality control decisions to be taken.Quality control information systems can be linked to higher level production control computers to form a computer integrated manufacturing (CIM) network. Free movement of data around a CIM network offers enormous flexibility and efficiency in the overall manufacturing process, together with considerable savings in manpower.Costs incurred in the creation of a quality control information system can be easily won back by virtue of the significant

ISSN:0748-8017    

DOI:10.1002/qre.4680010404

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

年代:1985

数据来源: WILEY

摘要:

AbstractThis paper discusses the application of known system reliability analysis techniques and identifies problems encountered in the practical implementation of these methods, revealing that no single technique is sufficient or even feasible in the case of complex mechanical systems. A new functional analysis method as well as a (new) criticality quantitative approach and failure mechanism analysis are presented and used to analyse an aircraft fuel system. A rigorous and detailed FMECA is still required. Besides its main function it will supply much of the valuable information for many other techniques.

ISSN:0748-8017    

DOI:10.1002/qre.4680010405

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

年代:1985

数据来源: WILEY

摘要:

AbstractThe development of theory and practice for electronic and mechanical reliability is described, and mechanical reliability is seen to be lagging in practice. Theory and practice are described for a project from conception to market feedback for mechanical as well as for electronic reliability. It is noted that for each phase theoretical and practical methods exist for mechanical as well as for electronic reliability analysis. Activities are listed which can strengthen mechanical reliability theory and practice.

ISSN:0748-8017    

DOI:10.1002/qre.4680010406

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

年代:1985

数据来源: WILEY

摘要:

AbstractAluminium bond wires are exposed to pulsed current with varying duty cycles, pulse widths and current amplitudes. How these parameters influence the temperature rise in the wire and what it takes to damage or break it are studied. There are two possible failure modes. One is burn‐out due to high current amplitude, the other is metallurgical flexure fatigue at the bond heel. Both failure modes are described. The thermal time constant of the wire is determined for different wire lengths. SEM studies of wires during pulsing are made to see structural changes in the wire when it heats. The bond wire may suffer from damage, which affects the reliability, but it may still function electricall

ISSN:0748-8017    

DOI:10.1002/qre.4680010407

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

年代:1985

数据来源: WILEY

ISSN:0748-8017    

DOI:10.1002/qre.4680010408

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

年代:1985

数据来源: WILEY

ISSN:0748-8017    

DOI:10.1002/qre.4680010409

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

年代:1985

数据来源: WILEY

ISSN:0748-8017    

DOI:10.1002/qre.4680010411

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

年代:1985

数据来源: WILEY

ISSN:0748-8017    

DOI:10.1002/qre.4680010412

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

年代:1985

数据来源: WILEY