Showing papers in "Ibm Systems Journal in 1962"
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TL;DR: A general purpose simulation program designed to simplify the task of simulating systems and is applicable to a wide variety of important problems.
Abstract: Systems engineers have come to recognize simulation as a valuable tool in their work. However, writing simulation programs can be a difficult, time consuming task requiring intricate and extensive programming. For simulation to be most useful, it must be possible to carry out a simulation quickly and be possible to change the simulation easily as the system design proceeds.
This paper describes a general purpose simulation program designed to simplify the task of simulating systems. It is applicable to a wide variety of important problems. The program features a simple block diagram language with which to describe the system to be simulated. Given this description, the program will automatically simulate the system.
53 citations
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TL;DR: There are, of course, many problems meriting further investigation: tables in their present form can become unwieldy when problem segments are prefaced by one or two simple decisions rather than six or seven complicated ones.
Abstract: There are, of course, many problems meriting further investigation: tables in their present form can become unwieldy when problem segments are prefaced by one or two simple decisions rather than six or seven complicated ones; it would sometimes be convenient to have rules in a table refer to other rules in the same table; rule identifiers in which the variable values are connected by (“or” rather than (“and” would sometimes be a convenience, and so on. Such further investigation would be desirable, since it would enhance the already considerable merit of tables as a means to implement program logic.
29 citations
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TL;DR: Two dissimilar examples are provided to illustrate various aspects of simulation in the systems engineering process and a new philosophy of multiprocessing is presented.
Abstract: The author assumes that the reader is familiar with the content of the preceding paper, "A General Purpose Systems Simulator," by G. Gordon. Two dissimilar examples are provided to illustrate various aspects of simulation in the systems engineering process. One example involves the study of an IBM 7040--IBM 7090 computer complex for scientific applications. The other concerns an IBM 1410 Tele-processing system for a stock brokerage house.
In addition to illustrating the paper, both examples are of intrinsic interest. The first presents a new philosophy of multiprocessing. The second examines a method of integrating communication facilities with an information processor.
22 citations
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TL;DR: Examination of the machine utilization and job turnaround problems of a large computer center by analyzing the information handling and queuing problems occurring between jobs finds a system designed to overcome these difficulties.
Abstract: This paper examines the machine utilization and job turnaround problems of a large computer center by analyzing the information handling and queuing problems occurring between jobs.
A system designed to overcome these difficulties is described and the results of simulating the system are reported. The system design includes the interconnection of input-output computers with large scale processors by means of commonly shared disk files.
Although this paper deals with a study which is not yet completed, the techniques developed and the results obtained to date are of general interest.
13 citations
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TL;DR: A flow chart description of a computer program incorporating a new optimization technique which will resolve many industrial processes of a nonlinear character and has been successfully tested on a number of problems.
Abstract: At present, there are many industrial processes of a nonlinear character for which it is dificult to develop an effective industrial process control system because no eficient mathematical method is known to carry out the optimization procedure.
This paper presents a flow chart description of a computer program incorporating a new optimization technique which will resolve many such problems. Although the mathematical basis for the technique is suggested, details and proofs are omitted--these will appear in a subsequent paper.
The technique has been successfully tested on a number of problems. Testing was conducted using a control system (IBM 1710) as well as both small and large computers (IBM 1620, 7090).
9 citations
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TL;DR: The fact that arithmetic is performed on the IBMB® 1620 Data Processing System by means of TABLE LOOKUP provides an opportunity for introducing special operations which may be executed by suitable table modification.
Abstract: The fact that arithmetic is performed on the IBMB® 1620 Data Processing System by means of TABLE LOOKUP provides an opportunity for introducing special operations which may be executed by suitable table modification
6 citations
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TL;DR: This paper will be devoted to a discussion of the simplest form of the Trim Problem, the so-called onedimensional Trim problem, which has both applications significance and technical difficulties that make it interesting.
Abstract: The Trim Problem has many forms, and most of this paper will be devoted to a discussion of the simplest one, the so-called onedimensional Trim Problem. Some other—and more difficult forms—will be mentioned at the end, but even the simplest case has both applications significance and technical difficulties that make it interesting. To gain some idea of the problem, consider this case.
2 citations