Showing papers on "Overhead (computing) published in 1971"

Mounting bracket for overhead window

Abstract: A mounting bracket for overhead windows wherein both the window frame and window have guide members. A pair of brace members are pivotally connected intermediate their ends to form four pivoting extremities, two of which are pivotally connected at a fixed axis to the two guide members, and two are pivotally connected to friction slides movable along the slide bars.

A Cyclic-Queue Model of System Overhead in Multiprogrammed Computer Systems

Abstract: A probabi l is t ic model is presented of a mul t ip rogrammed computer system operat ing under demand paging. The model contains an explicit represen ta t ion of sys tem overhead, the CPU requirements and paging character is t ics of the program load being described s ta t i s tically. Expressions for s teady-s ta te CPU problem program time, CPU overhead time, and channel ut i l izat ion are obtained. Some numerical results are given which quant i fy the gains in CPU uti l izat ion obta ined from mul t iprogramming. I t is also pointed out heur is t ica l ly and demonstrated numerical ly t h a t an actual decrease in CPU ut i l iza t ion results if there is too much overhead associated wi th mul t ip rogramming and if the average t ime be tween page exceptions decreases too rapidly wi th increasing number of mul t ip rogrammed jobs.

Associative processing of line drawings

Abstract: The marriage of computer graphics and an associative memory is a natural union. This is evidenced by the widespread use of software simulations of associative memories in today's most flexible graphical systems. The content-addressability of a hardware associative memory makes conventional addressing schemes superfluous and eliminates the need for pointers required to link related data, vastly reducing system overhead. The parallel retrieval and update functions possible with a hardware associative memory remove any need for multiple storage which is so prevalent in current systems and simultaneously increases processing speed. The capability of implicitly storing relations between data further decreases the storage requirements, while increasing flexibility.

Control variable methods in the simulation of a model of a multiprogrammed computer system

Abstract: One approach to the evaluation of the performance of multiprogranmed computer systems includes the development of Monte Carlo simulations of transitions of programs within such systems, and their strengthening by control variable and concomitant variable methods. An application of such a combination of analytical, numerical, and Monte Carlo approaches to a model of system overhead in a paging machine is presented.

Insulated overhead door for trucks and the like

Abstract: An overhead door assembly including a pair of spaced panels having insulating material located between the inside surfaces and holding the panels together. The insulating material is resilient to allow differential movement of the panels at least longitudinally of each other and preferably also laterally toward each other as the door is bent while moving between closed and open positions.

Mobile unit with overhead compartment

Abstract: A mobile home unit having an overhead compartment therein including a hump portion disposed above the driver''s cab with a foldable bed means therein forming the bottom of the compartment and having a streamline nosepiece member forming the front end of the compartment.

Simulation of a model of paging system performance

Abstract: Explored by simulation is the performance of a probabilistic model of a multiprogrammed single-processor computing system operating under demand paging. Results of experiments on statistical methods for improving the efficiency of the simulation are presented. Estimates of the response variables in the simulation are reported for a variety of conditions of system overhead, queuing delays, and transient response. Sensitivity of these factors to the assumptions of the model are discussed.

CP-67 measurement and analysis overhead and throughput

Abstract: The performance of a complex time sharing system was monitored under actual operating conditions during a period in which changes in system configuration (both hardware and software) took place. Various techniques for assessing the impact of those changes on performance are discussed.

Measurement of Electrostatic Potential Due to Overhead High Voltage Lines

Abstract: Calculation of the unperturbed or free electric potential at points near the line can be made by solving Laplace's equation. It is straightforward for simple line configurations, assuming cylindrical conductors running parallel with each other and with a plane ground surface at zero potential. For irregular conductor configurations, calculations become very cumbersome. Knowledge of the potential and gradient distribution in the space concerned is directly relevant to problems of electrostatic induction, and a simple method of measuring the free potential directly appears desirable. Such a method is described below. Also a possibility exists for measuring the transmission voltage by the same approach since the free potential in a point e.g. between line and ground is directly related to that voltage.

Overhead sign mounting

Abstract: Apparatus adapted to be secured to a pole or cable for supporting a vertical sign in any desired angular position about its vertical axis and for detachably locking same in said position.

Impact response of overhead sign bridges mounted on breakaway supports

Abstract: MOST MODERN ROADWAYS EMPLOY OVERHEAD SIGN BRIDGES TO RELAY INFORMATION TO THE MOTORING PUBLIC EFFICIENTLY. COLLISIONS WITH THESE MASSIVE STRUCTURES HAVE CAUSED SERIOUS INJURIES AND FATALITIES AS CURRENT INSTALLATIONS DO NOT EMPLOY SAFETY FEATURES THAT LIMIT IMPACT FORCES INCURRED DURING A COLLISION. THE GENERAL DESIGN CONSIDERATIONS AND THE RESULTS OF THE MATHEMATICAL SIMULATION OF VEHICLE COLLISION WITH OVERHEAD SIGN BRIDGES MOUNTED ON BREAKAWAY SUPPORTS ARE PRESENTED. THE RESULTS WERE OBTAINED THROUGH THE USE OF A MATHEMATICAL MODEL VERIFIED BY SEVEN FULL- SCALE CRASH TESTS. A COMPARISON OF MODEL AND TEST RESULTS IS SHOWN AND INDICATES GOOD AGREEMENT. THE STUDY WAS PERFORMED ON A HIGH-SPEED ELECTRONIC COMPUTER. THE FINDINGS AND THE RESULTS OF THE CRASH TESTS ARE: (1) THE APPLICATION OF THE BREAKAWAY CONCEPT TO THE SUPPORTS OF AN OVERHEAD SIGN BRIDGE IS FEASIBLE. (2) THE PROTOTYPE TRUSS POSSESSED THE ABILITY TO WITHSTAND THE TORSIONAL LOADS IMPARTED TO IT BY THE ROTATING SUPPORT, AND THE STRUCTURE AS A WHOLE REMAINED STABLE UNDER THE IMPACT FORCES. (3) VEHICLE-VELOCITY CHANGES AND DECELERATION RATES INCREASE AS BREAKAWAY BASE AND UPPE-SHEAR CONNECTION RESISTANCE INCREASE. (4) OCCUPANTS OF SMALL TO MEDIUM-SIZE VEHICLES COULD POSSIBLY SUFFER INJURY IN A COLLISION WITH THE PROTOTYPE SUPPORT. (5) LARGER VEHICLES WERE NOT SEVERELY DAMAGED IN COLLISIONS WITH THE PROTOTYPE SUPPORT. /AUTHOR/

System for handling and conveying relatively large workpieces or other objects

Abstract: A system for loading and unloading workpieces to and from gear cutting machines includes an overhead handling and conveying system capable of carrying relatively heavy loads along a longitudinal axis of movement and having means for guiding the loads to adjusted positions perpendicular to the longitudinal axis of movement. The overhead conveyor system includes a fixed overhead rail means for carrying the load of a carriage frame means suspended therefrom with a retained workpiece or other object. In addition, there is a guide track means suspended from said overhead rail, and the guide track can be adjusted in directions generally perpendicular to the main longitudinal axis of the overhead rail. The system provides for a transverse shifting of relatively heavy loads suspended from the overhead rail without any requirement for an adjustment in position of the load-carrying overhead rail itself.

Solvent extraction of c{11 {13 c{11 {11 aromatic hydrocarbons

Abstract: In a solvent extraction system utilizing a counter-current extraction column and an extractive distillation stripper for recovery of C6-C8 aromatic hydrocarbons, the feed is divided into light and heavy fractions containing, respectively, C6-C7 and C8 aromatics. The light fraction is introduced to the extraction column at an intermediate level along with the overhead stream from the stripper column, while the heavy fraction is introduced to the extraction column at a lower level. This procedure avoids loss of C8 aromatic components to the raffinate.