Showing papers on "Modularity (networks) published in 1982"
01 Jul 1982
TL;DR: This RFC will discuss some of the commonly encountered reasons why protocol implementations seem to run slowly, and suggest ways to address these issues.
Abstract: This RFC will discuss some of the commonly encountered reasons why
protocol implementations seem to run slowly.
90 citations
01 Apr 1982
TL;DR: Two approaches, asynchronous and clocked, are used in the design of a basic network switching module and a network clock distribution scheme which guarantees equal length clock paths is presented.
Abstract: A central issue in the design of multiprocessor systems is the interconnection network which provides communications paths between the processors. For large systems, high bandwidth interconnection networks will require numerous 'network chips' with each chip implementing some subnetwork of the original larger network. Modularity and growth are important properties for such networks since multiprocessor systems may vary in size. This paper is concerned with the question of timing control of such networks. Two approaches, asynchronous and clocked, are used in the design of a basic network switching module. The modules and the approaches are then modelled and equations for network time delay are developed. These equations form the basis for a comparison between the two approaches. The importance of clock distribution strategies and clock skew is quantified, and a network clock distribution scheme which guarantees equal length clock paths is presented.
46 citations
TL;DR: A multistep transmultiplexer approach with a single-way modulation scheme applying minimum phase wave digital directional or transversal filters is proposed and is suitable for LSI/VLSI integration with the potential of efficient testability.
Abstract: A multistep transmultiplexer approach with a single-way modulation scheme applying minimum phase wave digital directional or transversal filters is proposed. Furthermore, the impact of signaling, pilots, and spectral shaping at the PCM end is investigated. The results of a filter design based on wave digital filters is given. The main merits of this approach are, at a moderate level of computational complexity, its absolute stability, the low basic group delay, and its modularity. Due to modularity, the central unit (the TDM/FDM and FDM/TDM translators) is composed of only three different filter types requiring neither DFT, FFT, or associated processors nor modulators. As a consequence, the new approach is suitable for LSI/VLSI integration with the potential of efficient testability.
15 citations
TL;DR: This paper describes how one could develop a prototype in Ada for a small real-time control program and then successively enhance the prototype to produce the final production version.
Abstract: Prototypes provide a means for obtaining rapid feedback concerning the design of a system. Ideally, a prototype system should be easy to implement and modify; moreover, it should implement enough of the system's functionality to allow an evaluation of the design.The Ada programming language, with emphasis on modularity and well-defined module interfaces, appears suitable for implementing prototype systems. This paper describes how one could develop a prototype in Ada for a small real-time control program and then successively enhance the prototype to produce the final production version.
11 citations
TL;DR: The balanced-line algorithm is solved using abstract data types and the resulting Cobol program illustrated and it is suggested that the program's modular decomposition aids in the development of the solution.
Abstract: The best-known solution to the sequential file update problem is the balanced-line algorithm. Here, the problem is solved using abstract data types and the resulting Cobol program illustrated. It is suggested that the program's modular decomposition aids in the development of the solution.
9 citations
08 Mar 1982
3 citations
01 Jan 1982
TL;DR: This paper describes how one could develop a prototype in Ada for a small real-time control program and then successively enhance the prototype to produce the final production version.
Abstract: Prototypes provide a means for obtaining rapid feedback concerning the design of a system. Ideally, a prototype system should be easy to implement and modify; moreover, it should implement enough of the system's functionality to allow an evaluation of the design.The Ada programming language, with emphasis on modularity and well-defined module interfaces, appears suitable for implementing prototype systems. This paper describes how one could develop a prototype in Ada for a small real-time control program and then successively enhance the prototype to produce the final production version.
3 citations
TL;DR: In this paper, the conditions posed by the technology of steady state superconducting coils are introduced for the WENDELSTEIN VII-AS coil system scaled up to dimensions of reactor size, forces and material stresses are calculated.
Abstract: Modularity is most probably an essential prerequisite for a reactor. In a stellarator reactor this modularity can be achieved by the use of twisted coils instead of a helix and TF-coil system. For the WENDELSTEIN VII-AS coil system scaled up to dimensions of reactor size, forces and material stresses are calculated Only the conditions posed by the technology of steady state superconducting coils are introduced in this report.
2 citations
TL;DR: A new type of data structure is introduced: the definition data structure, which “represents” the user in the system, which is based upon the concepts of qualitative and quantitative modularity.
Abstract: Versatile and intelligent user tailored CAD systems are well suited for the small and medium scale mechanical industries. This paper presents a method to ease the work needed in the generation of such systems. Based upon the concepts of qualitative and quantitative modularity, a new type of data structure is introduced: The definition data structure , which “represents” the user in the system. The implementation of these ideas in two pilot systems are also discussed.
2 citations
Proceedings Article•
01 Jan 1982TL;DR: Wendelstein VII-AS as discussed by the authors is a stellarator experiment specially designed to investigate plasma behavior in an optimized magnetic field configuration for which theory predicts improved plasma equilibrium and smaller neoclassical transport losses compared to classical l= 2 configurations, like WENDELSTEIN VII-A.
Abstract: WENDELSTEIN VII-AS is a stellarator experiment specially designed to investigate plasma behaviour in an optimized magnetic field configuration for which theory predicts improved plasma equilibrium and smaller neoclassical transport losses compared to classical l= 2 configurations, like WENDELSTEIN VII-A. Its concept is based on operation in the main without ohmic heating currents which drive instabilities and cause anomalous losses in the plasma. The use of twisted coils for the confinement field system, instead of a TF-coil set and a helix, leads to a modularly designed device with improved access for additional heating methods (tangential NBI, ICRH, and ECRH). The vacuum vessel and the coil system structure also fulfill the conditions of modularity. Thus, WENDELSTEIN VII-AS incorporates a first technical step towards a modular stellarator reactor. The design features of the device and some characteristic data are presented.
TL;DR: Satisfactory accountability, that is, a control structure which protects corporate assets from theft, misuse, and fraud, is an important aspect of office information system design as discussed by the authors. But the OIS design goals of flexibility, efficiency, and modularity must not preclude the accountability needs of managers, stockholders, and auditors.
Abstract: Satisfactory accountability, that is, a control structure which protects corporate assets from theft, misuse, and fraud, is an important aspect of office information system design. The OIS design goals of flexibility, efficiency, and modularity must not preclude the accountability needs of managers, stockholders, and auditors. This will require meticulous examination of the OIS to ensure that it satisfies the multi-attribute control criteria used by auditors.