Assignment Planning Research Articles

Planung der Kuppelproduktion in Systemen von chemischen Mehrzweckanlagen

AbstractPlanning of Coupled Production in Multipurpose Chemical Plant. This article considers strategies for computer‐aided planning of coupled production for systems of net worked multipurpose plant. Reasons are given for the failure of classical strategies such as are used in PPS systems. A procedure is described which, starting from a final product, automatically generates a cascade of previous product jobs and assigns them to production lines along a time axis (simultaneous material, pecursor, and production line assignment planning). Possibilities of interactive improvements of a given solution on consideration of factors such as storage costs and turnover are presented.

公共コンテナ埠頭におけるバース割当計画

公共コンテナ埠頭におけるバース割当計画

SS/TDMA time‐slot assignment with knowledge‐base and prolog implementation

AbstractA software production system for the generation of time slot assignment plans for SS/TDMA systems is proposed and implemented. The approach used in this system conveniently combines algorithms derived for ideal configurations with heuristic procedures that are needed to account for conditions present in real systems. Algorithms that produce plans with a minimum number of switchings and minimum traffic transmission duration can now be easily implemented. The assignment plans obtained are as efficient as those previously reported when the assumptions are the same. The proposed production system, however is capable of handling a much larger variety of constraints and heuristic procedures for which no efficient solutions have been reported.

Controlled choice assignments: A new and more effective approach to school desegregation

The authors argue that conventional mandatory and voluntary school desegregation techniques have failed to provide minority students with maximum feasible relief from invidious discrimination because they do not redress the root causes of segregation. They demonstrate that residential-based student assignment plans as well as plans that give students limited access to a few educationally enriched magnet schools are not asymmetrical remedies to wrongful segregation and thus work to perpetuate the racial and social inequities that they purport to correct. The authors offer an alternative approach to school desegregation—controlled choice—that operates independently from residential housing patterns and which explicitly seeks to maximize personal choice within a racially unitary, equitable, and educationally enhanced system of public schooling. Controlled choice was originally pioneered in Cambridge, Mass. during the early 1980s and has recently been adopted in Little Rock, Ark., and Fall River, Mass. The policy is also being actively reviewed by several of the nation's largest school districts including Seattle, Memphis, and Boston.

Frequency Sharing Between the Broadcasting-Satellite Service and Other Radiocommunication Services

Most radiocommunication services, including the space services, share their frequency allocations with other services. Frequency sharing involving the broadcasting-satellite service is particularly difficult because of several factors. The allocations differ between the three ITU Regions of the world; the characteristics of broadcasting-satellite systems make them not only quite vulnerable to certain kinds of interference, but also make them major sources of interference to other systems; and certain key parameters of broadcasting satellites (carrier frequencies, orbital positions, beam dimensions and pointing, polarization, and e.i.r.p.) are prescribed by "closely packed" international assignment plans. This paper describes the sharing situations that have been created by the ITU's Table of Frequency Allocations, the sharing criteria which have been adopted to facilitate sharing, the criteria which need to be developed for certain bands, the interregional and interservice limits that have been incorporated in the Plans for broadcasting satellites, and the technical problems requiring study by international organizations. Measures to facilitate sharing are listed, and the significance of the forthcoming ITU Space Services Planning Conference is discussed.

Techniques in Corporate Manpower Planning: Methods and Applications.

The title of this book is Techniques in Corporate Manpower Planning: Methods and Applications. Manpower planning, also called personnel plan ning, implies the analysis of possible discrepancies in the future between personnel demand and supply. Personnel demand will also be called person nel requirement; and personnel supply, personnel availability. The notion of corporate manpower planning refers to the planning of personnel on the level of an industrial or governmental organization. As such, it does not stand for manpower planning for branches of industries or labor market studies of countries or international communities. One type of manpower planning is the planning of short-term succes sions of managers or the assignment planning of positions for individual employees for the next year. In fact, this type of short-term manpower plan ning is always executed, whether formally or informally, centrally or other wise. Another type of manpower planning, however, may be executed to match the requirement for and availability of personnel for the medium and long term. This type of manpower planning considers groups of employees rather than individuals. Our goal is to consider medium- and long-term manpower planning for groups of employees. We call this the multicategory vii Vlll PREFACE approach to manpower planning. In our view, this medium-and long-term personnel planning provides the conditions for individual manpower plan ning or for personnel development.

Link Bandwidth Planning for Distributed Computer Control Systems

In the economics of DCCS the cost of data communication is usually one of the dominant factors. This cost depends strongly on the bandwidth assignment plan, i.e., the topology and capacities of the data communication network. A model for optimization of this plan is proposed, as well as a solution method based on decomposition into more tractable separate topology and capacity assignment subproblems. Convergence and computational feasibility are theoretically discussed

A Breakthrough in Spectrum Conserving Frequency Assignment Technology

Frequency assignment procedures incorporating the use of a recently developed technique based on the theory of graphs are evaluated. The use of such procedures in the preparation of frequency assignment plans results in significant spectrum savings. The results obtained provide estimates of the potential extent of spectrum conservation that might be achieved through a national program revamping the present use of the spectrum.

Computed School Assignments in a Large District

The US Supreme Court decisions of 1954 on de jure segregation of schools, and recent decisions denying de facto segregation and barring “freedom-of-choice” pupil assignment, have forced school districts to devise plans for integrating public schools. Finding a feasible method of achieving racially balanced schools is difficult at best. A great number of factors must be taken into consideration. Recently, we have applied three linear programming models to a large school district (45 elementary schools, 20,000 students); they demonstrate the extent to which desegregation can be attained at moderate cost. The problems discussed in this paper include the collection and organization of data, and the problem formulation modifications necessary to conform to computer programs and storage limits. Some resulting assignment patterns are shown. Objective functions and reasonable constraints are suggested, but these can be modified. More important than the solution of a single problem is the fact that each solution represents a policy or point of view. School authorities, judges, and the public can see the logical implications of each point of view and select school assignment plans on a rational basis.

A Consumer-Economics View of Proposed CATV Channel Assignment Plans

A Consumer-Economics View of Proposed CATV Channel Assignment Plans

Housing. Public Housing. District Court Orders Housing Authority Not to Build in Black Ghetto and to Institute New Tenant Assignment Plan in Order to Remedy Past Discriminatory Practices. Gautreaux v. Chicago Housing Authority, No. 66c 1459 (N. D. Ill. Nov. 24, 1969), Modifying 304 F. Supp. 736, Enforcing 296 F. Supp. 907

Housing. Public Housing. District Court Orders Housing Authority Not to Build in Black Ghetto and to Institute New Tenant Assignment Plan in Order to Remedy Past Discriminatory Practices. Gautreaux v. Chicago Housing Authority, No. 66c 1459 (N. D. Ill. Nov. 24, 1969), Modifying 304 F. Supp. 736, Enforcing 296 F. Supp. 907

Locomotive Assignment Optimization Including Train Delays

Intention– Cyclic locomotive assignment planning is a specific type of organization of locomotive usage, and in fact, it means putting the complete workload to a closed chain, which is repeated periodically. The concept of cyclic locomotive assignment planning type organization in the area of train traction has proven in practice as the best one, but as it is made for in-advance defined timetable and without considering the stochastic nature of the timetable realization process, it leads to incompatibility in using locomotives. Methodology – Methodology defined in this paper contains: research of train delays on the Serbian Railways and Montenegrin Railways networks, analysis of the real system organization of locomotive usage in conditions of train delays, theoretical thesis of solving the problem of optimal cyclic locomotive assignment planning in conditions of train delays, designing of a model with algorithms, preparing the software package, testing the model and program with results, as well as the conclusions drawn from the complete research project. Results– The optimization model of cyclic locomotive assignment planning during the process of making timetable including train delays has been defined. Conclusion –The obtained results have shown as expected, that the larger delays of trains required a larger number of locomotives. However, by using this model it is possible to optimize the required number of locomotives, taking into account the real time delays of trains.

School rezoning to achieve racial balance: A linear programming approach

The recent Supreme Court decision barring “freedom of choice” pupil assignment plans has forced a large number of school districts to devise alternative approaches to school desegregation. One possibility is establishing attendance boundaries to mix races and linear programming is one method of planning such boundary lines. This paper discusses some technical aspects of the linear programming approach, including the formulation of the problem, some alternative constraint possibilities, branch and bound techniques to avoid splitting neighborhoods, and improvement in execution speed.

Frequency assignment plans for synchronous communication satellites.

Covers advancements in spacecraft and tactical and strategic missile systems, including subsystem design and application, mission design and analysis, materials and structures, developments in space sciences, space processing and manufacturing, space operations, and applications of space technologies to other fields.

Dynamic Job Assignment for Railway Personnel

This paper presents the results of a study on the assignment of jobs to the travelling personnel of a small railway company. The jobs in question are those of engine driver, conductor, etc. On one hand, these jobs have different requirements; on the other, the employees have different qualifications. The problem is to match job requirements and employee qualifications. The problem is a dynamic one since employees are assigned jobs on consecutive days of the month and, at the same time, a number of constraints as to the succession of jobs assigned to an employee are to be respected. In addition, all employees should get their fair share of jobs of each kind, early and late ones, short and long ones. This job assignment planning was formerly done in the company by means of a planning board every month—a procedure which was time-consuming and did not distribute the jobs among the employees fairly enough. A computer solution was, therefore, called for which would reduce the planning cost and also give greater employee satisfaction—an important factor in these days of “overemployment” and increasing demand for more leisure time.

UHF-TV Taboos: The FCC Electromagnetic Compatibility Plan for UHF Television

The constraints of assignment of channels to UHF TV stations are discussed, taking into account the radiated signal characteristics, the various undesired responses of receivers to signals on other than the channel to which they are tuned and effects of receiver local oscillator radiation. These "taboos" affect the assignment of many other channels for each assigned channel, due to the geographical separation requirements associated with the respective taboos. The basis for each taboo, the mileage separation required and the effects on assignment planning are discussed.

Radio interference reduction and spectrum utilization of VHF FM Net equipment in a mobile environment

Spectrum conservation and interference reduction are not mutually complementary in a field area complex. Spectrum economy implies minimum utilization of RF channels, whereas interference-free operation requires an extensive number of channels. A certain minimum level of interference is tolerable in practice. Therefore, it follows that a system designer achieves realistic spectrum economies by designing the frequency assignment plan for a “calculated risk” level of interference. Frequency assigners have, in fact, been doing just this sort of thing on a “rule of thumb” basis. An evaluation is made of what the use of such a practical rule means in terms of the probability of interference. The analysis is based on a statistical propagation model called “Universal Terrain.” A procedure is established for conserving spectrum when unlike combinations of equipment are employed. Curves of propagation loss and interference statistics are presented.

International Telecommunication Union

The conference of the International High Frequency Board in Mexico City terminated April 10, 1949 after having been in session since October 22, 1948. The purpose of the meeting was to consider frequency requirements of all countries, technical engineering problems, a frequency assignment plan and generally “to put to an end the anarchy prevalent in high frequency broadcasting.” Although it was first suggested that all problems should be considered anew at a future meeting of a technical committee in France, the majority of delegations felt that a final agreement should be concluded at Mexico at the same time as the Basic Plan for allocations which would only need to be completed by technical considerations. A French proposal that only those countries which had signed the Mexico Agreement by June 15, 1949 might take part in the work of the technical committee was adopted by 43 votes to 1 with 5 abstentions. The agreement was approved by 50 of the 69 countries participating; the United States and the Soviet Union did not sign the agreement.

The Influence of UHF Allocations on Receiver Design

The principle of affording protection to receivers from adjacent channel interference by alternate channel assignments has been universally accepted. It is shown that approximately 20 db added protection between receivers from local oscillator radiatian can be obtained by alternate channel assignments and receiver intermediate frequency standardization. There is also developed a square assignment plan in which added protection is provided for image interference, the picture image station being spaced 1.4 times the adjacent channel station and the co-channel station 2 times the adjacent channel station. It is shown that 41.25 is the optimum value of intermediate frequency for joint vhf-uhf usage.

International Telecommunication Union

The International High Frequency Broadcasting Conference opened October 22, 1948 in Mexico City with fifty-six of the sixty-four member countries represented. The Conference established committees to consider frequency requirements of all countries, technical engineering problems and a frequency assignment plan for high frequency broadcasting in accordance with principles determined by the Atlantic City Conference in 1947.