This paper describes the use of a digital computer in the design of concrete mixes for large construction projects. The salient features of a program called CONMIX are outlined, the nature of input data and output arc...
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A mathematical model which utilizes queuing theory is devised for estimating the storage requirements of a message switching computer. Since the storage needed for a message is proportional to the message length, the ...
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A mathematical model which utilizes queuing theory is devised for estimating the storage requirements of a message switching computer. Since the storage needed for a message is proportional to the message length, the familiar derivation of a queue distribution in terms of the number of messages is not applicable. Instead the composite queue, resulting from a number of sending lines, is developed in terms of fixed size units. This is normally distributed with mean and variance given as functions of the load factors of the sending lines. Occurrences of machine failures due to insufficient storage capacity are then shown, on certain assumptions, to be exponentially distributed. The method involves bold simplifications at a number of points with resulting errors which are moderate and in the direction of safety. The application to concrete problems is illustrated.
作者：
CHRISTOP.CATHE AUTHOR is Vice President of Technology and Manufacturing for Sperry Rand Corporation's Univac Federal Systems Division
St. Paul Minnesota. He holds a B. S. degree in Management Engineering from Rensselaer Polytechnic Institute. Mr. Christopher joined Univac in St. Paul in 1956 later moving to Division headquarters in suburban Philadelphia as Director of Operational Services and Planning. He became Director of Procurement and Administrative Services. Before returning to the Federal Systems Division in his present capacity he was general manager of the Univac Division operations in Utica-Ilion New York. In his present position
Mr. Christopher is responsible for engineering and programming factory operations (manufacturing) procurement advanced development program management and the Federal Systems Division's Salt Lake City Utah operations. In 1969 he was cited as Greater Utica's “Industrial Man of the Year.” Mr. Christopher is a member of the Society for the Advancement of Management and the Electronics Industries Association.
The benefits of data system computers to the Navy to date are developed to highlight the blessings. Both achievements and future requirements are discussed. The problems attendant on achievement of potential advantage...
The benefits of data system computers to the Navy to date are developed to highlight the blessings. Both achievements and future requirements are discussed. The problems attendant on achievement of potential advantages of data system computers, and the penalties of failure to liquidate these liabilities constitute the discussion of the curse of computerizations. Since both the potentials and liabilities of computers go forward hand-in-hand, the argument is made that computers can be a blessing to the degree that the liabilities are liquidated. Some practical suggestions as to liquidating the critical liabilities are offered from the point of view of industry to assist in attaining the potential of computers and data systems in support of the Navy's missions, roles, and objectives.
Character loss in a conceptual computer at its input terminals is analyzed. This is first done within the classical framework in which a system must be designed to allow no loss whatsoever. The problem is then treated...
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Character loss in a conceptual computer at its input terminals is analyzed. This is first done within the classical framework in which a system must be designed to allow no loss whatsoever. The problem is then treated where a system can allow some degree of loss. To this end, a generalized mathematical model for character schemes is constructed. It is then shown that, in this framework, character arrivals can be approximated by a Poisson source, allowing the problem to be reformulated as a question in queuing theory. As such, one can solve the problem as a limiting case of a problem which has already been solved. Finally, the resulting formulas for loss are approximated by formulas which can easily be applied. Certain conclusions may readily be drawn. One is that a vastly enlarged system may be designed if one allows some trivial amount of loss. Another is that various schemes for avoiding loss, which have been used in industry, have often been unnecessary.
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