Detailed Analysis Of Requirements Research Articles

Correlation dimension and systematic geometric effects

Correlation-dimension calculations have been widely undertaken in attempts to understand various physical and other natural phenomena. Some of these studies have perhaps been incautious in their claims. On the other hand, some authors have been sharply critical of such work. These criticisms hinge on doubts about data-set size. In particular, Smith [Phys. Lett. A 133, 283 (1988)] has suggested that ${42}^{\mathit{D}}$ points are a minimum number of data points, where D is the embedding dimension. He has suggested that, as a result, correlation-dimension calculations are limited to dimensions less than 5 or 6 even on supercomputers. By implication, many published results are placed into doubt, discouraging people from undertaking such calculations. We review the concept of critical embedding dimension and undertake a detailed analysis of data-size requirements, which culminates in tight error estimates for determination of correlation dimension. We conclude that, while data requirements are still substantial, they are not nearly so extreme as has been suggested, making the determination of correlation dimension from data sets feasible. Previously reported ``doubtful'' calculations of correlation dimension can be reviewed in the light of explicit error estimates.

Low Cost Thermal Vacuum Testing Facility for Electronic Units

A thermal vacuum testing facility for electronic units has been specified, designed, and built. It is fully operational and performs its tasks—thermal vacuum qualification and acceptance testing of electronic units. All performance requirements and design details have been carefully evaluated on a cost-effective basis, resulting in achieving the design goal of low price (purchase, operation, and maintenance) together with ease of operation, maintenance simplicity, and upgrading options. The major cost saving originated from a detailed analysis of thermal vacuum requirements that resulted in low cost substitutes to the common thermal shroud, together with a thermal plate. The plate is actively thermally controlled by a circulating fluid that is temperature regulated by a commercial heating and cooling unit. The high vacuum pumping system includes a diffusion pump with backstreaming holders.

Digital video transmission and coding for the broadband ISDN

An overview of visual communication in the broadband network is presented with particular attention to the transmission aspect of full-motion video. A detailed analysis of the quality requirements for digital video transmission is provided. Some significant coding algorithms presently under investigation by international bodies are reviewed. >

Design and implementation of an ISO/OSI session layer for a microprocessor-based LAN

This paper deals with the design and implementation of an ISO/OSI session layer carried out at the Dipartimento di Automatica e Informatica of the Politecnico of Turin for the MODIAC local area network. A detailed analysis of the application task requirements is introduced in order to explain the functional features selected for the layer. A Datagram service, not foreseen by the standard specifications, has been added to the session functional units, not foreseen by the standard specifications, to efficiently support time critical applications such as very high priority message handling. Performance data concerning memory occupancy and response times measured in a MODIAC prototype for the main session services are also reported.

The Management of Manufacturing Operations: An Appraisal of Recent Developments

A detailed analysis of Material Requirements Planning (MRP), Kanban, optimised Production Technology (OPT) and Flexible Manufacturing Systems (FMS), including the applied assumptions behind these and their limitations and weaknesses, shows that each system is sound in its own way and can accomplish low cost, high quality, on‐time production. People problems, however, can destroy the effectiveness of any system and in this respect Kanban and OPT systems solve the majority of people problems, while FMS installations, by design, eliminate most problems of this type. The experience gained during the coming decade may lead factory managers to use two or more of these systems side by side.

Interfacing or models and information systems: A systematic approach

Successful implementation of an OR model within an information system occurs only when the model becomes an integral part of the system. The process of incorporating a model into a system not only necessitates a detailed analysis of the model's informational requirements, which must be satisfied once the model is introduced into the system, but also requires an analysis of the information system with respect to these requirements. Such analyses may reveal that both the model and the system must be perturbed in order to effect a feasible interface. In determining the extent of the modifications to be made to each, the total cost of the various alternatives and the resulting effects on optimality must be established. This paper focuses on the development of informational models and procedures for performing these interface operations and the definition of a basis by which optimal or near optimal modifications and adjustments of the OR model and information system may be determined.

Researching into the Availability of Publications

Research for the Universal Availability of Publications program was needed to demonstrate the need for improvement and to suggest ways of achieving it. Money, man power, and time were all in short supply. The approach adopted was to conduct an extensive literature review, supplemented by questionnaires and personal knowledge and contacts, then to carry out a detailed analysis of requirements, criteria, obstacles, and so on, and finally to construct conceptual models of possible systems that might be applicable in different types of countries. The study of national interlending systems, which is summarized, illustrates this approach; three of the other five studies (of national acquisition systems, national retention systems, and international provision and supply), which are more briefly outlined, followed a similar pattern. The research approach used might be appropriate for other very broad topics where little hard information is available.

Analysis and design considerations for a real-time system for non-destructive evaluation in the nuclear industry

This paper studies the feasibility of implementing a real-time system for non-destructive evaluation of nuclear reactors based on the principles of synthetic aperture processing. A detailed analysis of the computational requirements and simulation and benchmarking work on several computers seems to suggest the design of a special purpose processor as the most viable solution to the problem. The paper concludes with a discussion of the parameters affecting field design and some preliminary design considerations of the overall system.

Antigen-specific human T-lymphocyte clones Genetic restriction of influenza virus-specific responses to HLA-D region genes

Human T lymphocytes, primed in vitro to influenza virus, were cloned by limiting dilution and expanded using medium containing interleukin 2 and feeder cells. A detailed analysis of the genetic requirements for induction of T-cell proliferation was conducted using a panel of cells from unrelated donors and two families who had previously been extensively phenotyped for HLA region antigens. Clones obtained from a Dw1,Dw3 individual required Dw1,DR1 histocompatibility for successful presentation of viral antigens by antigen-presenting cells. The antigen-presenting ability segregated with HLA-B,D,DR in an informative HLA-A/B recombinant individual. In contrast, some TLCs responded to antigen presented by cells that did not share known HLA antigens, and in one informative family, reactivity did not segregate with HLA. None of the T-cell clones reacted to allogeneic cells in the absence of antigen, suggesting that the TLCs do not bear receptors that recognize both influenza virus and alloantigens. In antibody-blocking studies. Dw1, DR1-restricted clones were blocked by all monoclonal anti-DR framework antibodies. The non-HLA-restricted TLCs were blocked by some, but not all, of the anti-DR framework monoclonal antibodies. These results confirm and extend the role of HLA-D region gene products in antigen presentation and also provide that yet undefined cell interaction products, which may include hybrid structures, are able to participate in antigen-specific proliferative responses by human T cells.

Databases for power system calculation

Large database management systems have been developed for commercial applications. Since the volume of data to be processed in technical power system calculations also increases continuously, there is rising interest in using database systems for power systems calculations also. A detailed requirement analysis based on a proposed classification of database approaches is combined with a survey of the state of the art and indications of further development needs.

A digitally addressed flat-panel CRT

Principles of operation and special operational features of a digitally addressed flat-panel electron beam display are discussed. Special emphasis is given to explaining methods of simplifying and optimizing the display structure for a given application, and techniques for implementing color and inherent storage to the structure. In addition, a fairly detailed analysis of the display power requirements is given, along with calculations for a specific display. Also covered are the operating characteristics of several prototype displays, and comments pertaining to life, manufacturability, and environmental characteristics.