`n Operasionele bestuursmodel vir die nie-geprogrammeerde opknapping van goedere treintrokke
- Authors: Briel, A.Z.A.
- Date: 2012-08-16
- Subjects: Railroads -- Cars -- Maintenance and repair -- Planning , Railroads -- Cars -- Maintenance and repair -- Management , Operations research , Transwerk (Firm : South Africa)
- Type: Thesis
- Identifier: uj:9466 , http://hdl.handle.net/10210/5898
- Description: M.Comm. , Operational management is to plan and control the transformation process that converts the requirements of customers into a product or a service. The non programmed refurbishing of railway wagons at Transwerk (Germiston) is a very difficult task for the operational manager. The number of wagons and what to repair on each wagon, only become known when the wagon arrives at Transwerk. The planning and scheduling of resources like labour, material, facilities, equipment and cash flow are therefor not so easy. To overcome the difficulties of the planning and scheduling of resources, and to refurbish the wagons according to the customer's requirements and satisfaction, it is necessary to have an operational management model or system. This system comprises of functions like aggregate planning, production scheduling, planning for fixed and variable capacities, inventory planning, design of the operational process itself as well as the control of the whole system. All of this must be set in a framework of the company's overall strategy as well as the financial and operational strategies. The first part of this study deals with the heories of operational management. It is important that the operational manager is familiar with the types of decisions to be made and what concepts are available to optimise his decisions. He also needs to know which product positioning strategy and which process positioning strategy to take. In the case of Transwerk a make-to-order product positioning strategy will be used to refurbish the wagons, and a make-to-stock strategy to manufacture the components that are needed to repair the wagons. A job-shop process positioning strategy will be used, because no fixed process flow can be followed to repair the different wagons. In the second part of this study an empirical research was done. The frequency and number of the different types of wagons that were sent to Transwerk, as well as the occurrence of the repair types on the wagons, were researched. Four years (1992 to 1995 book year) of information were used. The number of wagons and when the wagons might come in for repairs in 1996, as well as what types of repairs to do, are forecasted by using quantitative techniques as time series decomposition and weighted moving averages. The forecast or aggregate plan is the starting point of any operational model. Finally the operational model is designed. The model starts with the business- and operational strategies followed by the production plan. The production plan, derived from the forecast, shows the wagons that are expected to be built for the next five years. Transwerk should check the major available resources to assure that the production can be met. After the production plan is authorised by the executive manager the operational manager can do the master schedule. This schedule shows by model level which wagon types are expected to be repaired per day per month. This information also comes from the forecast that was done. Out of the master schedule, the material- and capacity plans can be drawn up. Production can start once the operational manager finds the planning to be correct. It is important that every step in the model is controlled and that the plans are changed if necessary. A well defined operational management model will help Transwerk on the way to be a world class company.
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An analysis of the South African Foundry Industry : competitiveness compared to international Foundries
- Authors: Mphasha, Molatelo Calvin
- Date: 2016
- Subjects: Operations research , Competition, International , Foundries - South Africa , Industrial relations - South Africa
- Language: English
- Type: Masters (Thesis)
- Identifier: http://ujcontent.uj.ac.za8080/10210/379084 , http://hdl.handle.net/10210/233206 , uj:23804
- Description: M.Tech. (Operations Management) , Abstract: Please refer to full text to view abstract
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Operasionele navorsing: model en interdissiplinariteit
- Authors: Venter, M. J.
- Date: 2009-03-31T09:00:33Z
- Subjects: Problem solving , Operations research
- Type: Inaugural
- Identifier: uj:14992 , http://hdl.handle.net/10210/2326
- Description: Inaugural lecture--Department of Statistics, Rand Afrikaans University, 5 June 1975 , Analysis of the activities of the wartime operational researchers suggests that three interacting components created the methodology to which much of their success can be ascribed. The systems approach to problem solving emphasised the necessity for clear, exact problem formulation. The use of mathematical techniques to model the problem being studied, enabled them to experiment with alternative solutions. Although the problems which confronted them, came from well outside their disciplinary boundaries, their interdisciplinary, and most important, formally scientific approach enabled them to succeed in solving the socia-technical problems. Different viewpoints regarding the content of the word "interdisciplinary" are discussed, and the view is put forward that although having a specialist knowledge of a specific field is valuable in an interdisciplinary context, being a good scientist in general is essential. It is stressed that in order to solve the problems confronting mankind, the lessons learned from these operational researchers cannot be ignored.
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Operasionalisering in die opvoedkunde
- Authors: Smith, John Butler
- Date: 2014-02-18
- Subjects: Schools - Philosophy , Operasionalism , Operations research
- Type: Thesis
- Identifier: uj:4130 , http://hdl.handle.net/10210/9477
- Description: D.Ed. , The aim of this study is the construction of a model according to -which theoretical educational concepts can be operationalized for purposes of empirical research, with maximal validity. The rationale for the study is that high level terminology in education must continually be established and tested against empirical reali ty for purposes of meta-theoretical justification. Such a model for operationalization must satisfy numerous criteria as well as conditions. An indication is given of the position of operationalization as a methodological step wi thin the broad scope of scientific practice. The following meta-scientific characteristics or conditions are postulated as guidelines for a model for valid operationalization: The external validity and effectiveness of scientific statements; The logical consistency of scientific statements; The informativeness and epistemic truth of statements;...
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