| Summary: | 碩士 === 國立臺灣科技大學 === 機械工程系 === 103 === Conventional DEMATEL (Decision Making Trial and Evaluation Laboratory) determines degrees of influence at 0~4 scale (0 = no influence; 1 = low influence; 2 = middle influence; 3 = high influence; 4 =extreme influence)by collecting experts’ opinions through questionnaires.But the study proposes a modified DEMATEL that evaluates the mutual influence among 0~4 scales through the concept of normalized numerical value. Normalized numerical value is a ratio of the number of times for appearance of important technical, functional and component keywords, which are obtained from term and word segmentation system, in multiple patent technique documents, to the total number of words in the entire texts of the patent groups with high relativity.First of all, the study takes LED reading lamp for example, and preliminarily classifies its techniques into 7 most important technical standards. Through the related technical words that each standard has and their normalized numerical values, the study firstly calculates the normalized numerical values of repeated technical words among the standards or those having the same definitions. Then the study calculates the ratios of the normalized values among the standards. Based on the ratios calculated, the study assesses the determined mutual influence scales 0~4 among the standards. After that, following the calculation procedures of DEMATEL, the study finds out the general relational influence matrix, direct/indirect relationship diagram, and the causal diagram. The causal diagram can help judge the degree of mutual influence among the standards, and judge which standards belong to more core technical standards. Then the study adds the modified DEMATEL’s calculating the general relational influence matrix to the modified ANP (Analytic Hierarchy Process) to form a modified DANP. Focusing on 3 design improvement plans of LED reading lamp, the study makes a priority order of selection, compares the prioritized design improvement plans obtained respectively from modified DANP and ANP. Through modified DAMATEL assist modified ANP of modified DANP the study makes a priority order of selection calculation results meets the actual circs better. After operation of modified DANP of LED reading lamp, the study practically applies the modified DANP to LED bicycle light. After making the related literature review of LED bicycle light products and analysis of different patents, the study regards support structure, clamping part, heat dissipation fins, heat conduction structure, lamp hood, internal configuration of LED light source, and power supply device as the most important technical evaluation standards for selection of product design plan. After that, the study uses the cause and effect diagram, acquired from analysis by modified DEMATEL, to explain the importance and relativity of 7 technical standards. It is found that power supply device is a more independent standard, and has lower degree of influence than other standards. Therefore, the study’s modified DANP does not list power supply device in the priority order of selection for innovative plans. The study preliminarily determines 3 main techniques to be improved for LED bicycle light, by modified DANP steps to Calculate 3 priority order of selection for innovative plans to compare with modified ANP. Finally, the priority of weights for the 3 innovative design plans are obtained from algorithm. The priority order of weights is: Plan B > Plan C > Plan A . That is Plan B’s “design of support structure + main structure of LED light source.” It best meets the optimal product design plan of LED bicycle light. After making research on the priority order of selection via DANP, the study uses modified TRIZ invention method to improve innovative designs. The study makes improvement in the fast structure dismantling design of support-connected bicycle light, which is related to design of support structure in the innovative design plan B , as well as the light reflected hood in the internal configuration of LED light source, which is related to main structure of LED light source in Plan B. Here two improvement results of innovative design are acquired. Finally, the study acquires the new design of LED bicycle light.
|
|---|
