A ship design methodology is presented for developing hull forms that attain improved performance in both seakeeping and resistance. Contrary to traditional practice, the methodology starts with developing a seakeepin...
A ship design methodology is presented for developing hull forms that attain improved performance in both seakeeping and resistance. Contrary to traditional practice, the methodology starts with developing a seakeeping-optimized hull form without making concessions to other performance considerations, such as resistance. The seakeeping-optimized hull is then modified to improve other performance characteristics without degrading the seakeeping. Presented is a point-design example produced by this methodology. Merits of the methodology and the point design are assessed on the basis of theoretical calculations and model experiments. This methodology is an integral part of the Hull Form Design System (HFDS) being developed for computer-supported naval ship design. The modularized character of HFDS and its application to hull form development are discussed.
A collaborative effort has been undertaken at both UMIST and Rensselaer to use interactive computer graphics to develop an improved user interface for the UMIST suite of programs for performing analysis, design, and s...
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A collaborative effort has been undertaken at both UMIST and Rensselaer to use interactive computer graphics to develop an improved user interface for the UMIST suite of programs for performing analysis, design, and synthesis of controlsystems. The objective is to explore ways in which presently available and newly emerging interactive graphics terminals can be employed with this specific suite and with control design packages in general. This paper is a presentation of the plans for this project and a report on its progress to date.
A discrete event process is modelled as a discrete state dynamic system which generates as output a formal language over the alphabet Σ. The objective of supervision is to ensure that this output language has certain...
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A discrete event process is modelled as a discrete state dynamic system which generates as output a formal language over the alphabet Σ. The objective of supervision is to ensure that this output language has certain desired properties. We define the concept of a controllable language and derive necessary and sufficient conditions for the existence of a supervisor to achieve a given controlled behavior. We also show that every supervisor contains an internal model of the resulting supervised behavior.
This paper describes an evolving Arithmetic Design System (ADS) to support the quantitative evaluation of alternate number systems with respect to a given application and realization technology. A finite number system...
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This paper describes an evolving Arithmetic Design System (ADS) to support the quantitative evaluation of alternate number systems with respect to a given application and realization technology. In computer arithmetic...
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This paper describes an evolving Arithmetic Design System (ADS) to support the quantitative evaluation of alternate number systems with respect to a given application and realization technology. In computer arithmetic we are concerned with establishing a correspondence between abstract quantities (numbers) and some physical representation (symbols), and with simulating the operations on these symbols. The ADS is intended to help study the cost and performance of alternate simulations. A finite number system is a triple consisting of a symbol set (elements are called "digit-vectors"), an interpretation set, a mapping between these two sets, and a set of operators (digit-vector algorithms) defined on its symbol set. A set of these digit vector algorithms are proposed for conducting arithmetic design. A number system matrix defines the digit vector algorithm for numerous number systems and a method for computing time and space complexity of compositions of these algorithms is proposed. An example of how the system could be used to compare addition, with and without overflow detection, for three number systems is given.
作者：
T.L. JohnsonControl Systems Department
Bolt Beranek and Newman Inc. Cambridge Massachusetts and Department of Electrical Engineering and Computer Science M.I. T. Room 35-205B Cambridge Massachusetts USA
Dynamic Simulation is defined as the hardware and software required to present to the student operator visual and audible cues and responses that are the same as those encountered when operating the control Consoles a...
作者：
Atkins, Daniel E.Ong, Shau-ChiProgram in Computer
Information and Control Engineering the Systems Engineering Laboratory of the Department of Electrical and Computer Engineering University of Michigan Ann Arbor MI 48109 United States
Component and time complexity measures in terms of number of gates and gate delays, respectively, are derived for two multioperand adder structures: a tree of carry-save adders and a tree of carry-lookahead adders. Th...
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