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비정질 실리콘 TFT의 광누설 전류에 Backlight 광원의 광학적 특성이 미치는 영향에 대한 연구
임승혁,권상직,조의식,Im, Seung-Hyeok,Kwon, Sang-Jik,Cho, Eou-Sik 한국전기전자재료학회 2008 전기전자재료학회논문지 Vol.21 No.9
The photo leakage currents of a conventional hydrogenated amorphous silicon(a-Si:H) thin film transistor(TFT) were investigated and analyzed in case of illumination from various light sources such as halogen lamp, cold cathode fluorescent lamp(CCFL) backlight, and white light emitting diode(LED) backlight. The photo leakage characteristics showed the apparent differences in the leakage level and in the $I_{on}/I_{off}$ ratio in spite of the similar luminances of light sources. This leakage level is expected to be related to the wavelength of the lowest intensity peak from the spectral characteristics of light sources.
액장 소결한 $\beta-SiC-TiB_2$계 전도성 복합체의 특성
임승혁,신용덕,송준태,Yim, Seung-Hyuk,Shin, Yong-Deok,Song, Joon-Tae 대한전기학회 2000 전기학회논문지C Vol.52 No.10
The mechanical and electrical properties of the hot-pressed and annealed $\beta-SiC-TiB_2$ electroconductive ceramic composites were investigated as a function of the liquid forming additives of Al_2O_3+Y_2O_34. The result of phase analysis of composites by XRD revealed $\alpha-SIC(6H)\;TiB_2,\; and YAG(Al5Y3O12) crystal phase. The relative density and the mechanical properties of composites were increased with increasing $Al_2O_3+Y_2O_34 contents because YAG of reaction between $Al_2O_3\; and\; Y_2O_3$ was increased. The Flexural strength showed the highest value of 432.5MPa for composites added with 12wt% $Al_2O_3+Y_2O_34 additives at room temperature. Owing to crack deflection crack bridging phase transition and TAG of fracture toughness mechanism the fracture toughness showed 7.1MPa.m1/2 for composites added with 12wt% $Al_2O_3+Y_2O_34 additives at room temperature. The electrical resistivity and the resistance temperature coefficient showed the lowest of $6.0\times10-4\Omega.cm\; and\; 3.1\times10-3/^{\circ}C4 respectively for composite added with 12wt% \Omega additives at room temperature. The electrical resistivity of the composites was all positive temperature coefficient resistance (PTCR) in the temperature range of $25^{\circ}C\; to\; 700^{\circ}C$.
Strategy for Securing Key Patents in the Field of Biomaterials
임승혁,김창용,이철우,정영미,김수현 한국고분자학회 2020 Macromolecular Research Vol.28 No.2
The quality of life is gradually improving with the development of medicine and the rising standard of living, but human beings are still faced with the risks of various diseases, accidents, aging, and industrial disasters. Accordingly, the importance of biocompatible materials for treating and recovering human tissues or functions is increasing. Furthermore, materials with various biological functions that interact with surrounding tissues and cells are being researched and developed, instead of materials that simply replace damaged tissues. This study analyzes the research and development trends of biocompatible materials and examines the latest status of technological developments. Biocompatible materials generally include metals, ceramics, polymers, gels, and composite materials. Polymer materials began to be widely used as biocompatible materials from the mid-20th century. Recently, polymerextracellular matrix (ECM) composite technology using ECMs, which exist naturally in the human body, is drawing considerable attention. Thus, the ultimate objective of this study is to establish strategies to secure key patents in the field of polymer materials among various biocompatible materials. To this end, quantitative and qualitative analyses are conducted based on patents published in South Korea, the U.S., Japan, and Europe by country, keyword, applicant, and inventor. Based on the results of these analyses, this study examines recent patent application trends, and establishes directions for technology development and strategies for developing key technologies in this field. Consequently, four major strategies are established: technology development, purchasing patents, setting cross-licenses, and bypass technology development. Subsequently, concrete patent acquisition plans in line with each direction are conceived. In addition, four industries related to biocompatible materials (over-the-counter drugs, prescription drugs, medical materials, and cosmetics) are selected, the key patents in each industry are examined, and patent acquisition scenarios are suggested.
효과적인 피난을 위한 보행거리 및 출구 폭에 대한 연구
임승혁,최승복,최돈묵 한국화재소방학회 2021 한국화재소방학회논문지 Vol.35 No.2
With increasing industrialization, large-scale, complex, and high-rise buildings are under way; therefore, Korea's buildingand fire-fighting laws need to be modified to ensure the use of active measures backed by performance-based design. However, the current standard of domestic performance-based design is weaker than that of overseas standards for firescenarios and other specific conditions. In this study, the domestic and foreign standards and simulations were reviewedto determine the criteria for walking distance and entrance width and a reasonable and safe evacuation time in the eventof an evacuation situation. 국내 성능위주설계의 기준은 화재 시나리오 및 기타 구체적인 조건들을 제시하는 해외 기준에 비해 빈약하여 실제와 유사한 피난시간 도출에 어려움이 있다. 이에 본 연구에서는 피난상황 발생 시, 내부 재실자가 안전하게 피난할수 있는 합리적인 피난시간을 도출하기 위해 국내외 기준 검토 및 시뮬레이션을 통해 보행거리 및 출입구 폭에 대한기준을 제시하고자 했다. 본 연구의 제시안은 피난동선과 출입구의 유효 폭을 적용하는 직접적인 방법과 장애물이많은 장소나 출구가 2개 이상인 경우 등 화재실의 특성에 맞는 피난 해석 조건을 마련함으로써 다양한 화재 시나리오를 포괄적으로 적용할 수 있도록 제시하였다. 시뮬레이션 결과 피난 관련 요소의 측정 기준의 부재로 국내외 기준및 본 연구에서 제시하는 제시안의 기준에 따라, 피난시간에서 큰 차이가 발생한 것으로 확인되었다. 본 논문의 결과를 기반으로 화재 시나리오의 선정 및 피난시간 결정 요소들에 대한 측정 기준을 제시하여 내부 재실자들의 안전을보장할 수 있는 실효성 있는 피난 설계에 대한 추가적인 연구가 필요하다고 생각된다.