Showing papers on "Domain (software engineering) published in 1975"

Protection of information in computer systems

Abstract: The topics of protection of information, data security, and privacy In the domain of Computer systems are of particular significance in our society, which is increasingly keeping its records in computer based systems. This paper is an excellant technical survey of the mechanics of protecting computer-stored information from unauthorised use or modifications, with a focus on tire conceptual framework necessary tu enforce data security.

Two-Dimensional Model

Abstract: A general two-dimensional theory will be developed in the same lines as the three-dimensional one considered before. The two-dimensional domain will be denoted by S and its boundary by Γ

Deductive retrieval mechanisms for state description models

Abstract: This paper presents some programming facilities for modeling the semantics of a task domain and for describing the situations that occur in that domain as a task is being carried out Each such description models a "state" of the task environment, and any given state can be transformed into a new state by the occurrence of an event that aIters the environment Such modeling systems are vital in many Al systems, particularly those that do question answering and those that do automatic generation and execution monitoring of plans The modeling mechanisms described are basically extensions and modifications of facilities typically found in Al programming languages such as PLANNER, CONN1VER, and QA4 In particular, we discuss our use of a 3 valued logic, generator functions to deduce answers to model queries, the saving and maintaining of derived results, and new facilities for modeling stntc changes produced by the occurrence of events

A Critical Appraisal of Integrated Treatments of Contingency Findings

Abstract: A number of questions are raised about the theoretical nature of aggregative models of situational approaches to organization and management. These include questions regarding the domain of conting...

Issues in packet switching network design

Abstract: The goals of this paper are to identify several of the key design choices that must be made in specifying a packetswitching network and to provide some insight in each area. Through our involvement in the design, evolution, and operation of the ARPA Network over the last five years (and our consulting in the design of several other networks), we have learned to appreciate both the opportunities and the hazards of this new technical domain.

Contouring and the Contour Map: a New PERSPECTIVE*

Abstract: With few exceptions, traditional approaches to contouring have been too subjective. Contouring and contour maps are too often discussed in terms more appropriate to art than to science. With hand contouring there is some justification for this attitude; with machine (i.e. programmed) contouring there is none. Hand contouring is highly susceptible to interpretive judgement and the interpreter is not bound by rigid mathematical constraints. Hence, in allowing for the interpreter's “freedom of expression” it may be difficult to evaluate hand contouring in a totally analytical and objective manner. Machine contouring, however, is based upon mathematical formulation. It is therefore a consistent and objective procedure, ideally suited to objective definition and analysis. It can be demonstrated that the combined process of sampling plus contouring constitutes a two-dimensional filter. The contouring component is that part which introduces “distortion” or wavenumber discrimination. An ideal contour package is one that acts as an all-pass filter where the distortion is zero. The application of filter theory to the evaluation of a machine contour package and its performance permits description in the more convenient language and terminology of the wavenumber domain, rather than that of the space domain. A more important advantage is that the contour package can be subjected to the various standards of filter evaluation such as amplitude and phase response. The practical application, as well as the benefit, of this approach is revealed through the comparison, in both the space and wavenumber domains, of contour maps generated from various machine contour packages.

Charge transfer device

Abstract: PURPOSE: By forming a stopper domain which protrudes into shift registor, potential wafer effective for charge transfer is obtained with the advantage of the potential of the above domain. COPYRIGHT: (C)1977,JPO&Japio

Generation of random-dot stereogratings

Abstract: Stereogratings are an extension of periodic stimulation to the Cyclopean domain. A program for the generation of random-dot stereogratings is described, with discussion of the advantages and disadvantages of the program.

Bubble domain sensor-error detector

Abstract: An improved thick film sensor for detection of magnetic bubble domains which can be configured to provide soft error detection and full data rate sensing. The sensor can be fabricated using single level masking techniques and is typically a magnetoresistive sensor comprised of NiFe. In its basic configuration, the sensor is comprised of two sets of magnetoresistive elements, each set including a sensor element and a dummy element, where both the sensor element and the dummy element provide a signal due to the bubble domain to be sensed. The magnetoresistive elements are arranged in a bridge circuit to give full data rate sensing and soft error detection. In a preferred embodiment, chevron expander-detectors are used, although the geometry of the sensor and dummy elements is not limited to chevron-type geometries.

A representation and some mechanisms for a problem solving chess problem

Abstract: : This paper is a condensation of a recent PhD dissertation. It describes a program, CAPS-2, and presents both its form and some of the results obtained in testing it. The domain of the work is chess tactics, and the emphasis is on recognizing situations and dealing with them explicitly. Discussed are (1) Recognition predicates, (2) Methods of stating specific problems so that their solution is easier than the general problems that include them, and (3) Ways that results of dynamic analysis (tree search) can be made available throughout a search tree for various purposes.

Method of testing and repairing magnetic bubble domain chip

Abstract: A method of both testing all loops of a long serial magnetic bubble domain chip, and repairing the chip for automatic bypass of defective loops. Each repair station associated with each loop is sequentially loaded with a bubble domain. Then new domains are sequentially generated and positioned adjacent each loop. The domains initially loaded into the repair stations are shifted out in parallel for propagation along the loops. The new domains are then loaded in parallel into the repair stations. The domains propagated along the loops are read to determine defective loops, and form a basis for generating a repair pattern. The repair pattern is then loaded in parallel into the repair stations for sealing off defective loops.

Dual access magnetic domain memory

Abstract: A magnetic domain memory system includes a domain propagation track, having a plurality of minor loops of equal domain capacity, first and second major loops of equal domain capacity and first and second groups of transfer switches which couple each minor loop to the first and second major loops, respectively, and a control system, responding to asynchronous commands, to access any selected record in the minor loop through the first group of unused switches which the circulating record encounters. The accessed records are updated in the major loops, each of which includes a domain detector, generator and annihilator, and the updated records are transferred back into the locations in the minor loops which the original records occupied. The design of the dual access memory provides domain bit synchronization which means that after any domain bit makes one full circulation around the major loop, the bit may be transferred into the same location in the minor loop which the bit originally occupied.

Compound detector for magnetic domain memory devices

Abstract: In a magnetic domain memory, a domain detector system includes a passive domain splitter in a domain propagation track, a first detector in the propagation track for detecting one of the domains from the splitter, and a second detector in an auxiliary propagation track which extends from the splitter, the detector outputs being combined to enhance the total output signal. The relative angular orientation of the detectors may be varied to provide any desired signal shaping. The passive splitter has features which ensure reliable domain splitting characteristics.

The Use of Time Domain Techniques for Microwave Transistor s-Parameter Measurements

Abstract: The determination of microwave transistor s-parameter over a frequency band up to ? lOGHz by means of Time Domain Techniques, involving Fourier analysis and deconvolution of transient response data, is described and compared with network analyzer techniques. A method for the extraction of active device parameters from measurements on packaged devices is presented.