An Alternative Approach for Designing Microwave Circuits using a Personal Computer

A computer-aided design (CAD) program, Puff, for designing microwave integrated circuits is presented. The program runs on an IBM PC, PS/2, or compatible computer, and features a single interactive-graphics screen which displays all aspects of the design. Circuit elements, such as transmission lines, coupled lines, and lumped elements, are selected from a parts list and drawn on the screen using cursor keys. The circuit analysis is then performed directly from the screen drawing. To demonstrate the various features of Puff, predictions for a 10-GHz patch antenna with a stub matching circuit are compared with measurements made with an HP 8510 network analyzer

Satellite-Host Tradeoffs in Computer-Aided Design Systems

Computer-aided design is the generic term for a rapidly proliferating set of techniques which have become mandatory for all who wish to maintain their competitive positions in an increasing number of industries. CAD practitioners in advanced technology industries such as aerospace and electronics are usually highly sophisticated in computer usage and therefore able to configure their own CAD environments to suit their requirements. Those, however, who are relatively new to computers, are faced with a bewildering set of choices over which they have to make decisions. Should they have a cheap terminal linked to a remote time-sharing bureau? Should they attempt to do their whole design job on a dedicated, medium-sized in-house computer? Or should they invest in a high capability, intelligent terminal backed up by access to a central (or network-distributed) number-crunching and data-bank facility? What graphic facilities should they use? A drum plotter, a storage-tube display, interactive refresh graphics unit, hardware rotation, conic generation, zooming, are all choices that are presented to them and the manufacturers' praise of their own line is often more confusing than helpful. The International Institute for Applied Systems Analysis, IIASA, has recently embarked on a World Survey of CAD, one of whose aims has been to provide guidance to would-be users on the establishment of CAD facilities suited to their needs. In this work IIASA has relied heavily on the analysis of the activity phases in CAD, currently being conducted by W.G. 5.2 (Computer-Aided Design) of IFIP (The International Federation for Information Processing)

Some research advances in computer graphics that will enhance applications to engineering design

Research in man/machine interactions and graphics hardware/software that will enhance applications to engineering design was described. Research aspects of executive systems, command languages, and networking used in the computer applications laboratory are mentioned. Finally, a few areas where little or no research is being done were identified

Exploration of Reaction Pathways and Chemical Transformation Networks

For the investigation of chemical reaction networks, the identification of all relevant intermediates and elementary reactions is mandatory. Many algorithmic approaches exist that perform explorations efficiently and automatedly. These approaches differ in their application range, the level of completeness of the exploration, as well as the amount of heuristics and human intervention required. Here, we describe and compare the different approaches based on these criteria. Future directions leveraging the strengths of chemical heuristics, human interaction, and physical rigor are discussed.Comment: 48 pages, 4 figure

Interactive graphical computer-aided design system

System is used for design, layout, and modification of large-scale-integrated (LSI) metal-oxide semiconductor (MOS) arrays. System is structured around small computer which provides real-time support for graphics storage display unit with keyboard, slave display unit, hard copy unit, and graphics tablet for designer/computer interface

Digitally interpreting traditional folk crafts

The cultural heritage preservation requires that objects persist throughout time to continue to communicate an intended meaning. The necessity of computer-based preservation and interpretation of traditional folk crafts is validated by the decreasing number of masters, fading technologies, and crafts losing economic ground. We present a long-term applied research project on the development of a mathematical basis, software tools, and technology for application of desktop or personal fabrication using compact, cheap, and environmentally friendly fabrication devices, including '3D printers', in traditional crafts. We illustrate the properties of this new modeling and fabrication system using several case studies involving the digital capture of traditional objects and craft patterns, which we also reuse in modern designs. The test application areas for the development are traditional crafts from different cultural backgrounds, namely Japanese lacquer ware and Norwegian carvings. Our project includes modeling existing artifacts, Web presentations of the models, automation of the models fabrication, and the experimental manufacturing of new designs and forms