Although the indispensibility of access control mechanisms in data secure systems has been recognized, there is a need for more subtle protection and refined control mechanisms. This report describes context protection mechanisms which enable the same data unit to be protected differently in different contexts, the differences being determined by…

This description of software development for the 1970 Survey of Compensatory Education analysis contract is presented in three sections: (1) specifications for data and output, (2) descriptions of the programs written, and (3) problems encountered while processing the data. The section on Specifications contains the description of the data to be…

Describes the operation and numerous capabilities of a British computerized data retrieval system named Prestel. It provides access, through the regular telephone network and a TV screen, to computer-based information supplied by many companies, agencies and commercial outlets. (GA)

Investigates applicability of inverted file processing in magnetic bubble memories by presenting four magnetic bubble memory models as storage mediums: one based on a major-minor loop configuration; one utilizing a decoder design on a magnetic bubble memory chip; and two based on different structural configurations of the first two. (MBR)

Information based on courses and seminars held at the Second International Summer School on the elaboration of linguistic and literary fundamentals, Pisa, Italy, September 1972; paper presented at the Second International Conference on Linguistics and Translation, October 4-7, 1972, Montreal, Canada. (DD)

Holography is one of the most promising methods now under research for the achievement of high bulk storage with fast random access at a reasonable cost. (Author)

INDEX, an interactive retrieval program developed at Pepperdine University, is described. It is easy to use and maintain, locates sources of information from a general description of the information needed, requires only a modest investment of time, and is widely applicable. (MLW)

A wide range of computer crimes and the need for computer security are discussed. (MK)

Presents a new image compression algorithm that employs some of the most successful approaches to adaptive lossless compression to perform adaptive online (single pass) vector quantization with variable size codebook entries. Results of tests of the algorithm's effectiveness on standard test images are given. (12 references) (KRN)

Evaluates the performance of different methods of data compression coding in several situations. Huffman's code, arithmetic coding, fixed codes, fast approximations to arithmetic coding, and splay coding are discussed in terms of their speed, memory requirements, and proximity to optimal performance. Recommendations for the best methods of…

Presents an inference algorithm that produces a weighted finite automata (WFA), in particular, the grayness functions of graytone images. Image-data compression results based on the new inference algorithm produces a WFA with a relatively small number of edges. Image-data compression results alone and in combination with wavelets are discussed.…

The Computer Assisted Reference Locator (CARL) is a computer-based information retrieval system which uses coordinate indexing. Objectives established in designing the system are: (1) simplicity of reference query and retrieval; (2) ease of system maintenance; and (3) adaptability for alternative computer systems. The source documents input into…

Computers have been used in a variety of applications for athletics since the late 1950's. These have ranged from computer-controlled electric scoreboards to computer-designed pole vaulting poles. Described in this paper are a computer-based athletic injury reporting system and a computer-assisted football scouting system. The injury reporting…

The computer program sets up three dictionaries: basic, fiction, and fantasy. It then processes each essay by parsing the essay into words, checking if the word is a legal word (in the dictionary), and adding it to the essay unique word list. If the word was non-unique, the frequency count for that word in the essay word list is increased by one.…

For the 1971-72 tryout of IMS Version 3, special-purpose, optically scannable materials were developed and designed. Purpose, design considerations, and developmental stages are described for each form. Adapted formats for use with the Xerox 660 Scanner/Copier are explained. The forms are appended. (SK)