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Y<sub>2</sub>O<sub>3</sub>-카본 복합체의 전기전도성에 미치는 소결온도의 영향
최관영,오윤석,김성원,김형순,박종훈,이성민,Choi, Kwan-Young,Oh, Yoon-Suk,Kim, Sung-Won,Kim, Hyung-Sun,Park, Chong-Hun,Lee, Sung-Min 한국세라믹학회 2012 한국세라믹학회지 Vol.49 No.2
The $Y_2O_3$ ceramics have been widely used as plasma resistant materials in the semiconductor industry. In this study, composites made of plasma resistant $Y_2O_3$ and electrically conductive carbon have been produced. The electrical properties of this composite were measured with respect to the size, volume fraction of the conductive carbon phase, and sintering temperature. When micro-sized carbon was used, the composites were insulating up to 5 wt% addition of the carbon. However, when nano-sized carbon of around 60 ~100 nm was used, the composites became conductive over threshold volume fraction of carbon, which increased with increasing sintering temperature. This behavior of electrical conductivity of the composites was discussed in terms of the percolation theory. The percolation threshold of the conductivity seemed to be affected by the grain growth and coalescences of dispersed conductive carbon phases with grain growth of matrix $Y_2O_3$.
국내의료관광상품의 기대속성과 성과에 따른 관광객만족에 미치는 영향에 관한 연구
최관영(Choi, Kwan-Young) 국제관광산업학회 2016 국제관광산업연구 Vol.9 No.1
This study a As Korea is widely known for its excellence in medical technology and competitiveness in price, medical tourism sector has high growth potential. In particular, the medical techniques in plastic surgery and beauty maintain the world top class level. anks to dramas and K-Pops through Korean wave, most of South East Asian countries show their great interests in cosmetic surgery beyond their good feeling about Korea. us, it is urgently needed to seek for the plans to nurture our own advantages in medical sector. Having considered the competitive and optimized medical tour products needs to be developed urgently, this study will compare the satisfaction level of existing medical tourism products in accordance with various needs and expectations of the foreigners visiting Korea for the purpose of medical tourism and investigate the products that are in fact considered and preferred and, based on the ndings, suggest the direction for the development of Korea’s medical tourism products and the marketing for that. To proceed with this study, the foreigners visiting Korea for medical tourism during Jun 2015~Nov 2015 were targeted and a documentary study and an empirical study were paralleled to achieve the purposes of this study. 314 copies of questionnaires that were returned were used, and frequency analysis, factor analysis, correlation analysis, reliability analysis, and regression analysis were conducted using SPSS 18.0 statistical package program. The ndings from this study based on empirical data are as follows. First, to develop the objective and practical measuring tools for the expectations for medical tourism products and its performance, the extracted factors through the theoretical study were veried through factor analysis and reliability analysis. And, as a result, it was analyzed 4 components, medical tourism support services, medical tourism infrastructure, medical infrastructure, facilities and atmosphere are inconsistent with the expectations. As a result of the analysis, in respect of the expectations about medical tourism products, 3 factors, excluding medical tourism infrastructure, had a significant effect on the discrepancy in expectations, and in respect of performance, medical tourism support service and medical infrastructure had a signicantly affect on the discrepancy in expectations. In respect of the expectations about medical tourism products, among factors, facilities and atmosphere had the biggest effects and in respect of the performance by medical tourism products, medical tourism support services had the biggest effect. Third, the discrepancies in expectations formed due to the expectations and its performance had effects on the behaviors attracting the minds of foreignpatients. This shows that the it can be an important criterion not only for the return visits of tourists and medical sectors, but also for increasing the number of tourists in tourism industry. Through this, this study aims to seek for the development of our differentiated products for foreign patients and attract more tourists in the future, and based on this, suggest the direction of Korea’s medical tourism products in the future. The finding from the study is that based on the medical techniques and service, the efforts for the convenient facilities. comfortable atmosphere, transportation and communicationfor the foreign patients, taking advantage of our unique seasonal and geographical attributes, the construction of convenient facilities and comfortable atmosphere, through recognizing the unique attribute, the tourism for patients, foods and the effective marketing activities focusing on the development of products and the differentiation of its values, are needed.
음정현,최관영,남산,최균,Eum, Jung-Hyun,Choi, Kwan-Young,Nahm, Sahn,Choi, Kyoon 한국세라믹학회 2009 한국세라믹학회지 Vol.46 No.6
Surface Texturing is very important process for high cell efficiency in crystalline silicon solar cell. Anisotropic texturing with an alkali etchant was known not to be able to produce uniform surface morphology in multi-crystalline silicon (mc-Si), because of its different etching rate with random crystal orientation. In order to reduce surface reflectance of mc-Si wafer, the general etching tendency was studied with HF/HN$O_3$/De-ionized Water acidic solution. And the surface structures of textured mc-Si in various HF/HN$O_3$ ratios were compared. The surface morphology and reflectance of textured silicon wafers were measured by FE-SEM and UVvisible spectrophotometer, respectively. We obtained average reflectance of $16{\sim}19$% for wavelength between 400 nm and 900 nm depending on different etching conditions.