Extension Engineering Method Research Articles

An Optimal Collocation Strategy for the Key Components of Compact Photovoltaic Power Generation Systems

The objective of this study was to develop an optimal evaluation system for collocating photovoltaic (PV) modules and power conditioners by using the extension engineering method. The matter-element model and correlation functions of the extension theory were adopted as the basis of the proposed extension evaluation system, which was then used to develop a multilevel evaluation model for PV modules and PV power conditioners. The extension evaluation system was used to evaluate and test numerous PV modules and power conditioner products that are commonly employed and commercially available in Taiwan. First, a PV module matter-element model was established based on price, power temperature, size, and weight, and a PV power conditioner matter-element model was established based on input voltage range, maximum power point tracking (MPPT) voltage range, number of MPPT units, minimum operating voltage, and maximum input current. Second, the weighting values of the various characteristics in the extension method were determined according to numerous consideration factors of the PV modules and power conditioners. Finally, the values of the degree of correlation between numerous user preferences and the various PV modules and power conditioner brands were calculated using correlation functions to determine the key components of PV power generation systems (PV-PGSs) that corresponded to user preferences. The test results confirmed that the proposed extension evaluation system can determine the optimal collocation for the key components of the PV-PGSs under different user preference settings.

The method of Network Risk Assessment based on the Extension Engineering

With the fast paced development of the network planning techniques, its application in the project management area is gaining momentum. The practice of network planning in real life projects is affected by a variety of risk factors. In order to better estimate project status with network planning techniques, the article proposes a methodology to quantify the degrees of risks and to take precautions during project execution to minimize the risk related costs and to achieve the project objectives. This methodology performs an overall evaluation of the risk factors through the extension engineering method, considering the unpredictability nature of the continuing effect of the risk factors on Program Evaluation and Review Technique (PERT)

Comprehensive Assessment of Highway Construction Based on Extension Engineering Method

The extension engineering method is introduced in detail. Comprehensive assessment indexes for highway construction are established by means of extension decision theory and main item analysis method. With a project as an example, application of extension engineering method to comprehensive evaluation of highway construction is discussed. It is showed that the present method is reasonable and has vastly applicable prospect compared with other methods.

Building a Relationship between Elements of Product Form Features and Vocabulary Assessment Models

Based on the characteristic feature parameterization and the superiority evaluation method (SEM) in extension engineering, a product-shape design method was proposed in this study. The first step of this method is to decompose the basic feature components of a product. After that, the morphological chart method is used to segregate the ideas so as to generate new product forms. Finally, the extension engineering method can be used to build the relationship between the feature parameters and the image vocabularies. With this method, designers are able to communicate with their clients via Internet and develop more suitable products for consumers by evaluating their impressions with the assistive system. It has been verified that this approach can reduce the development time as well as enhance the effectiveness and competitiveness of a new product.

The Comprehensive Safety Evaluation Method on the Safety Situation of Iron Mine Based on AHP and Extension Theory

To solve the qualitative and quantitative problems in safety evaluation, we employ the professional knowledge of extension engineering method, analytic hierarchy process (AHP) and relevant iron mine safety evaluation index system, combined with extension engineering method and regional safety assessment to establish the matter-element model of safety evaluation analysis on iron mine safety based on extension theory. Based on the safety data of iron mines, we further analyze the influential factors of the regional safety. Firstly, these influential factors are divided into two levels based on AHP, and then the weights of two layers index are calculated respectively. Secondly, with scores measured by experts, the safety level of the influencing factors is determined based on extension theory. Finally, given the weight and safety level of the influence factors mentioned above, the safety conditions of iron mine is determined accordingly. The results of the study show that this analysis based on AHP-the extension engineering method absorb the essence of the traditional evaluation method, and minimize the defects of the various methods. The method can accurately evaluate safety level of iron mine, measure the distance between the actual safety level and adjacent safety level, and better reflect iron mine safety situation. It is of certain significance for the classification of safety situation. The method also has a broad application prospects in other engineering fields.

Research on the method of shipping risk early-warning based on matter-element theory

The purpose of shipping risk early-warning is that some effective measures are taken to reduce risk probability before the risk brings heavy loss. The shipping risk has the dynamic characteristic, so the key of early-warning is to choice risk early-warning index correctly and evaluate risk grade quantitatively. According to the element extension theory, the rhombus inference model is applied to establish the index system. And the problem of risk grade evaluation can be solved by the assessment model of multi-index performance parameter, which is developed by the extension engineering method. Finally, the main shipping risks and their grades are identified by the example analysis based on the statistical data, which shows the effective and feasible of the shipping risk early-warning method.

Extension and Unascertained Measure for Evaluation of Information Systems Security

Quantitative security risk evaluation of information systems is increasingly drawing more and more attention. The purpose of this paper is to propose a novel method integrated extension theory and unascertained method to classification for information systems (IS) security. The risks of information system are established on the basis of analyzing the factors affecting the risks of information system by applying the unascertained measure theory. Using matter-element theory, the extensibility of IS security is analyzed, and then the framework of matter-element models for IS security is formed. The matter element model of IS security risk evaluation is established using matter element model theory based on extension engineering method. Theoretical analysis and the design principle of the proposed method are described in detail. Some simulations are performed to demonstrate the effectiveness of the proposed extension and unascertained method. The result is believed to provide new means and ideas for the evaluation of IS security. The method is suitable for evaluating the risks of IS. Its evaluating results are reasonable. An example of practical application is given to show the effectiveness of this method. The model is more efficient than former models and can be easily realized in practice.