基于網(wǎng)絡(luò)特性分析的時間費(fèi)用權(quán)衡問題研究
[Abstract]:With the development of economy, the position of project management in social development is becoming more and more important, and the three main objectives of project management are time, cost and quality management, time and cost management are closely related and mutually restricted. The time-cost trade-off problem of comprehensive optimization of time and cost is a very important aspect in project management, which is of great significance in practice. In order to solve the problem of time-cost trade-off, this paper mainly studies how to fully integrate the characteristics of the Critical Path Method (CPM) network plan, especially the characteristics of the maneuver time, and realize the effective solution to the problem of time-cost trade-off. The study of time-to-cost trade-off began in the early 1960s and the scope involved was greatly expanded in the following decades, but there has been no breakthrough in the solution of the problem, The most important bottleneck is to solve the high complexity and the large amount of computation encountered in this type of problem. In order to eliminate the bottleneck, this paper adopts a new approach to reduce the computational objects involved in solving the problem to reduce the high complexity and the large amount of calculation, and not to design or improve the solution to the problem. This paper uses the key route method network planning technology as a tool, and on the basis of the study of the mobile time characteristic, the network of the super-large process is simplified into the equivalent simple network, so that the non-computable problem can be converted into a computable question. The problem is that the complex problem can be transformed into a relatively simple problem, especially using the network to solve the time-cost trade-off problem after the simplification, and the calculation amount of any algorithm can be greatly reduced Therefore, the research of this paper not only has important theoretical significance, but also has great practical price. In addition to the equivalent simplification, the paper further adopts two other measures to simplify the time-cost trade-off process, one is to determine the maximum effective compression amount of each compression, and the other is to correct the construction period of each process. The amount of compression is determined. The maximum effective amount of compression for each compression is determined to achieve the most efficient compression of the total duration in order to achieve the most efficient compression of the total duration with the least compression step, in principle, in one-step compression, the critical route in the compressed network, when a new critical route appears in the network, stops The amount of compression is the maximum effect of the step compression at this time. The amount of compression used to correct the construction period of each process is mainly based on a basic principle of global optimization, that is, the step of step is not equal to full The Bureau is optimal. Even if each compression is at the lowest compression cost, and the amount of compression is also the maximum effective compression, the final compression effect may not be optimal or even worse, and therefore, in order to achieve a global optimum pressure, It is necessary to correct the compression amount of each process to make it truly optimal. The main principle of correcting the amount of compression is that if the amount of compression of a critical process is optimal, it must still be a critical step after it is compressed; if it is compressed to become a non-critical step, the amount of compression at this time must not be optimal, and it is necessary to make a correction, that is, to work it The period is extended until the process is re-established as a key. The subject of this paper. The content is as follows:1. For critical paths the line method is extended. The traditional key route method can be used to determine the desirable range of each process time. The time parameters of each process are not strictly limited by themselves, but are limited by the total construction period and other processes, and are critical The route method is shown. However, if the time parameters of certain processes have a certain limit, such as only at a certain moment, or at some point of time, the time parameters of the other processes will change in the influence of it, and the use of the traditional key The route method can't be known. Therefore, this paper makes an analysis of this kind of situation, and puts forward the key route method of the expansion, which is used to solve the process time in this situation. 2. Using the CPM network plan and combining the network flow algorithm is the most widely used method to solve the time-cost trade-off problem, but it has some advantages, but In this paper, the advantages and disadvantages of this method are pointed out in this paper. In this paper, it is pointed out that the solution effect and the accuracy of the method are to be improved, and the improvement is made. The principle of improvement is presented in this paper.3. An improved method of direct method is proposed. In order to solve the problem of time-cost trade-off, according to the improvement of the direct method, the improvement measures are put forward, for example, a new method of equivalent simplification time-cost trade-off is put forward, and the maximum effective amount of compression for each step in the construction period compression is proposed. The reasonable correction of the amount of time limit of the construction period, etc., and make use of these measures Two methods of improving the direct method are presented.4. The solution of continuous type is proposed. The new algorithm of time-cost trade-off problem. The time-cost trade-off problem is analyzed from a new angle based on the improvement principle and the thought of the direct method.
【學(xué)位授予單位】:華北電力大學(xué)
【學(xué)位級別】:博士
【學(xué)位授予年份】:2013
【分類號】:TP301.6
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