A brief overview is given of the STATEMATE system, a graphical working environment, intended for the specification, analysis, design, and documentation of large and complex reactive systems, such as real-time embedded...
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ISBN:
(纸本)0897912586
A brief overview is given of the STATEMATE system, a graphical working environment, intended for the specification, analysis, design, and documentation of large and complex reactive systems, such as real-time embedded systems, control and communication systems, and interactive software. It enable a user to prepare, analyze, and debug diagrammatic, yet precise, descriptions of the system under development from three interrelated points of view, capturing, respectively, structure, functionality, and behavior. These views are represented by three graphical languages, the most intricate of which is the language of state charts used to depict reactive behavior over time. In addition to use of state charts, the main novelty of STATEMATE is in the fact that it understands the entire descriptions perfectly, to the point of being able to analyze them for crucial dynamic properties, to carry out rigorous animated executions and simulations of the described system, and to create running code automatically.< >
The paper describes an on going research project in which a complex computer game is employed as part trainer within a flight training program., The game is used to teach subjects strategies of attention control and e...
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The paper describes an on going research project in which a complex computer game is employed as part trainer within a flight training program., The game is used to teach subjects strategies of attention control and efficient allocation of processing resources. The control of attention is claimed to bea trainable skill which is central to the task of piloting an aeroplane. The paper discusses the theoretical roots of a novel approach to the training of complex skills and its application in an actual training environment.
The Department of Defense Trusted computer System Evaluation Criteria (TCSEC) establishes a requirement for formal verification activities of a TCB (trusted computer base) designed for mandatory of verified protection...
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The Department of Defense Trusted computer System Evaluation Criteria (TCSEC) establishes a requirement for formal verification activities of a TCB (trusted computer base) designed for mandatory of verified protection. The goal of formal verification is to prove that the design specification of a system is consistent with its security policy. The authors elaborate the principles of the formal verification process. They discuss the inputs needed, processing performed, outputs produced, and analysis involved. In addition, they examine the resources required and present some observations in the form of cautions.< >
The authors discuss the available alternatives for building multilevel secure automated command, control, communications, and intelligence systems (CCCI systems). It is concluded that the only way to have a high degre...
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The authors discuss the available alternatives for building multilevel secure automated command, control, communications, and intelligence systems (CCCI systems). It is concluded that the only way to have a high degree of confidence that the anticipated threat can be countered is to base a CCCI system on a TCB (trusted computer base) having a security kernel (i.e., on a Class B3 or A1 TCB rather than Class B2 TCB). The recommended approach is to provide the required operating system services as a nonsecurity-critical extension to a commercially available Class B3 TCB, making it possible to use technology that is available, affordable, and immediately usable. It is concluded that the desired extensions are practical within the constraints of a CCI system development project and could be implemented using standard softwareengineering techniques without impacting the highly-assured security characteristics of the system enforced by the underlying security kernel.< >
The enhancement of man-machine communication is introduced by reviewing some aspects of the social impact of computer technology. It is argued that worries that computers will be a dehumanizing influence on everyday l...
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The enhancement of man-machine communication is introduced by reviewing some aspects of the social impact of computer technology. It is argued that worries that computers will be a dehumanizing influence on everyday life can be partially alleviated by better design of the human interface to the technology. Examples of humans perceptual and motor limitation are cited to show how specific understanding of these limitations can determine ways that computers can be used to enhance man-machine communication.< >
The Minneapolis Heart Institute cardiovascular database has been implemented. The basic mechanics represent a mixture of fourth-generation developmental tools (SAS System and System 2000 DBMS) and technical innovation...
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The Minneapolis Heart Institute cardiovascular database has been implemented. The basic mechanics represent a mixture of fourth-generation developmental tools (SAS System and System 2000 DBMS) and technical innovations by computer experts and medical professionals. Illustrating the process the Minneapolis Heart Institute used for picking its cardiovascular database, the authors enumerate and discuss the essential parameters for successful implementation of a research database. These include administration of the request for proposals, functional requirements of DBMS systems, construction of forms for data acquisition, budgeting, system analysis and design, schema definition and design, dealing with vendors and sales representatives, selection of software and hardware, dealing with obstacles, quality control and data security, and statistical data processing.< >
The interleaving span of coded frequency-hopped systems is often constrained to be smaller than the decoder memory length, i.e. nonideal interleaving is performed. Analysis of the performance of a hard-decision decode...
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The interleaving span of coded frequency-hopped systems is often constrained to be smaller than the decoder memory length, i.e. nonideal interleaving is performed. Analysis of the performance of a hard-decision decoder and an erasure-control decoder of Reed-Solomon codes is presented, both for ideal and nonideal interleaving. The interference consists of worst-case partial-band noise jamming and thermal noise. The frequency hopping system considered uses orthogonal MFSK modulation and noncoherent demodulation with quality bit output based on Viterbi's ratio-threshold technique. Optimization of the ratio-threshold and the erasure-control parameters is performed in worst-case partial-band jamming, and the resulting performance for several interleaver spans is presented.< >
The subject of User Interface Management systems (UIMS) has been a topic of research and debate for the last several years. The goal of such systems has been to automate the production of user interface software. The ...
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With the more recent development of high performance microcomputers, efforts have been made to adapt. Information systems (GIS) software to microcomputers for application to a wide variety of Civil engineering problem...
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ISBN:
(纸本)0872625699
With the more recent development of high performance microcomputers, efforts have been made to adapt. Information systems (GIS) software to microcomputers for application to a wide variety of Civil engineering problems. Little problem has been encountered in fitting the software component of these systems, however, file handling limitations are requiring innovative changes in the way spatial data is stored and retrieved. Limited memory size and magnetic media storage have driven the development of data compression and segmentation techniques that will have beneficial effects in the development of both mainframe and microcomputer GIS.
Designers are utilizing relatively sophisticated software but constractors, except for the largest companies, are limited to the most basic business applications. Integrative use of computers throughout the project ph...
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ISBN:
(纸本)0872625699
Designers are utilizing relatively sophisticated software but constractors, except for the largest companies, are limited to the most basic business applications. Integrative use of computers throughout the project phases is yet to be developed and adopted widely. This is probably due to the lack of useable and economical software, awareness and training. Educators concerned about this problem have included computer applications in the construction curriculum, particularly those dealing with estimating, scheduling and specifications. Few construction programs have courses and projects especially devoted to integrative use of computers in construction. This paper describes WPI's Construction Information and Applications systems used for the undergraduate, graduate and continuing education levels. Developments and evolutions of these systems, current contents, applications, software adopted or internally developed to support them.
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