| Summary: | 碩士 === 國立臺灣科技大學 === 機械工程系 === 107 === Traditional TOPSIS method has to depend a lot on the opinions of experts, so it has the shortcoming of being too subjective. Therefore, the paper develops a concept of normalized numerical values of functional word cluster of the functional domains obtained from patent analysis, and establishes a modified fuzzy TOPSIS method that combines with modified fuzzy DANP method to determine the priority order of different improvement projects.
The paper firstly takes LED track light as an example for analysis, and then takes dental light as an example for analysis. According to the modified fuzzy TOPSIS method mentioned above, the paper finds the priority order of different functional improvement projects. The acquired most prioritized improvement project of the functional improvement projects is matched with the product technical/functional matrix. Focusing on the functional domains to be improved, the paper selects applicable technical domains for application to modified TRIZ method and lets them serve as a reference in thinking of innovative method for the design of new products.
As mentioned above, the paper combines product functions with modified fuzzy TOPSIS method of modified fuzzy DANP for actual application to dental light, and its procedure is further explained below. After reviewing the related literature of dental light product and analyzing different patents, the paper divides dental light into 3 functional improvement projects of product: Project A is increase of assembly convenience + improvement of evenness and luminosity of light + adjustment of illumination strength and range; Project B is heat dissipation increase + cost reduction and service life extension + adjustment of illumination strength and range; and Project C is increase of assembly convenience + heat dissipation increase + cost reduction and service life extension.
The criteria of product functions are divided into 7 functional domains: 1. increase of assembly convenience; 2. improvement of shadow and dazzling light; 3. improvement of evenness and luminosity of light; 4. heat dissipation increase; 5. eye fatigue reduction; 6. cost reduction and service life extension; and 7. adjustment of illumination strength and range. These 7 functional domains serve as the most important functional evaluation criteria for selection of new product-improvement projects. After that, through the causal diagram drawn after analysis by the product function-based modified fuzzy DEMATEL, the paper analyzes the core functional field of the above 7 functional domains and the degree of mutual influence among different functional fields.
The paper takes the 3 interdepending product function improvement projects of dental light as the modified fuzzy TOPSIS projects, to calculate the priority order for selection of the 3 functional improvement projects. Finally, through algorithm, the paper obtains the weight matrix of dental light. The paper suggests that the total relational influence matrix T of modified fuzzy DEMATEL is paired with internal interdependence of modified fuzzy ANP so as to compare to matrix W3 and carry out matrix computing, thus forming the weight W3D of a new modified fuzzy DANP.
After that, according to the procedure of modified fuzzy DANP method, the paper calculates the fuzzy decision-making matrix WP of each project. Then, fuzzy W3D and Wpij of fuzzy Wp are substituted in equation Rij of modified fuzzy TOPSIS method for calculation. Other related equations of modified fuzzy TOPSIS method are also used for calculation of the priority order of different functional improvement projects, and then the most prioritized functional improvement project is selected.
The paper also applies the product technical/functional matrix of dental light to find, based on the most prioritized selected functional improvement project, the corresponding applicable technical domain. After a suitable technical domain is selected for improvement, the paper uses modified TRIZ invention method to make innovative and improved design. Finally, a newly designed dental light can be achieved.
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