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Analytic Models in Memory and Processor Allocation
A problem of memory and processor allocation to competing programs in time-sharing environment is investigated. Two level (core and auxiliary) paged memory system is studied. An analytic model of CPU time needed (instructions executed) and memory required (pages needed) is proposed as an approximation to actual program behavior. Specific probability distributions are postulated for CPU time needed and memory required; these are used in studying memory and processor allocation. Program behavior (execution) in paging environment is modeled; a memory-use estimator function is derived (page size dependence of this function is explicitly included). This model conforms to previous results established in simulation studies of program behavior. Based on memory-use estimator function, paging characteristics of a single program and the system under multiprogramming are studied. (Author Modified Abstract).
User Interface Design
Solidly founded on 25 years of research and teaching, the author integrates the salient features of the subdisciplines of computer science into a comprehensive conceptual framework for the design of human-computer interfaces. He combines definitions, models, taxonomies, structures, and techniques with extensive references and citations to provide professors and students of all levels with a text and practical reference.
Fundamentals of Spatial Information Systems
The study and application of spatial information systems have been developed primarily from the use of computers in the geosciences. These systems have the principle functions of capturing, storing, representing, manipulating, and displaying data in 2-D and 3-D worlds. This book approaches its subject from the perspectives of informatics and geography, presenting methods of conceptual modeling developed in computer science that provide valuable aids for resolving spatial problems. This book is an essential textbook for both students and practitioners. It is indispensable for academic geographers, computer scientists, and the GIS professional. Serves as the first comprehensive textbook on the field of Spatial Information Systems (also known as Geographic Information Systems) Contains extensive illustrations Presents numerous detailed examples
Being Fluent with Information Technology
Computers, communications, digital information, softwareâ€"the constituents of the information ageâ€"are everywhere. Being computer literate, that is technically competent in two or three of today's software applications, is not enough anymore. Individuals who want to realize the potential value of information technology (IT) in their everyday lives need to be computer fluentâ€"able to use IT effectively today and to adapt to changes tomorrow. Being Fluent with Information Technology sets the standard for what everyone should know about IT in order to use it effectively now and in the future. It explores three kinds of knowledgeâ€"intellectual capabilities, foundational concepts, and skillsâ€"that are essential for fluency with IT. The book presents detailed descriptions and examples of current skills and timeless concepts and capabilities, which will be useful to individuals who use IT and to the instructors who teach them.
Scientific and Technical Aerospace Reports
Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
