Tektronix

About: Tektronix is a company organization based out in Beaverton, Oregon, United States. It is known for research contribution in the topics: Signal & Waveform. The organization has 2975 authors who have published 4210 publications receiving 67404 citations.

Scientific Charge-Coupled Devices

Abstract: The charge-coupled device dominates an ever-increasing variety of scientific imaging and spectroscopy applications. Recent experience indicates, however, that the full potential of CCD performance lies well beyond that realized in devices currently available.Test data suggest that major improvements are feasible in spectral response, charge collection, charge transfer, and readout noise. These properties, their measurement in existing CCDs, and their potential for future improvement are discussed in this paper.

The Dexter hypertext reference model

Abstract: This paper presents the Dexter hypertext reference model. The Dexter model is an attempt to capture, both formally and informally, the important abstractions found in a wide range of existing and future hypertext systems. The goal of the model is to provide a principled basis for comparing systems as well as for developing interchange and interoperability standards. The model is divided into three layers. The storage layer describes the network of nodes and links that is the essence of hypertext. The runtime layer describes mechanisms supporting the user’s interaction with the hypertext. The within-component layer covers the content and structures within hypertext nodes. The focus of the model is on the storage layer as well as on the mechanisms of anchoring and presentation specification that form the interfaces between the storage layer and the within-component and runtime layers, respectively. The model is formalized in the specification language Z, a specification language based on set theory. The paper briefly discusses the issues involved in comparing the characteristics of existing systems against the model.

A group-theoretic model for symmetric interconnection networks

Abstract: The authors develop a formal group-theoretic model, called the Cayley graph model, for designing, analyzing, and improving such networks. They show that this model is universal and demonstrate how interconnection networks can be concisely represented in this model. It is shown that this model enables the authors to design networks based on representations of finite groups. They can then analyze these networks by interpreting the group-theoretic structure graph theoretically, Using these ideas, and motivated by certain well-known combinatorial problems, they develop two classes of networks called star graphs and pancake graphs. These networks are shown to have better performance than previous networks. >

Interactive multimedia system

Abstract: An interactive multimedia audio/video communications system uses a lower data rate, non-deterministic graphics/command network having a plurality of desktop viewing stations and a network server. A separate, higher data rate, deterministic audio/video network is coupled to the plurality of desktop viewing stations using appropriate resources, such as an audio/video routing switcher and a professional disk recorder. A database contains a telephone directory so that when a user at one of the plurality of stations desires to communicate with another station, the user selects a telephone number and the server from the database determines the appropriate resources required to complete the connection. The server configures the necessary hardware via the graphics/command network to route the audio/video signals over the audio/video network from one station to the other. For conferences a quad splitter is used to combine up to four video signals into a singled composited video signal for display at the user's station. For communications with stations that exist on another node, the server communicates with the server at the other node and a codec farm is used to transfer the audio/video signals from the audio/video network of one system to the other. Thus the graphics/command network is left free for normal graphics operations once the audio/video communications has been established.

Partition testing does not inspire confidence (program testing)

Abstract: Theoretical models are used to study partition testing in the abstract and to describe the circumstances under which it should perform well at failure detection. Partition testing is shown to be more valuable when the partitions are narrowly based on expected failures and there is a good chance that failures occur. It is concluded that for gaining confidence from successful tests, partition testing as usually practiced has little value. >