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이인규,이광식,장시영,Lee In-Gyu,Lee Kwang-Sik,Chang Si-Young 한국분말야금학회 2004 한국분말재료학회지 (KPMI) Vol.11 No.6
The bi-materials composed of $Al-5wt{\%}Mg$ and its composite reinforced with SiC particles were prepared by ball-milling and subsequent sintering process. The size of powder in Al-Mg/SiCp mixture decreased with increasing ball-milling time, it was saturated above 30 h when the ball and powder was in the ratio of 30 to 1. Both $Al-5wt{\%}Mg$ powders mixture and $Al-5wt{\%}Mg/SiCp$ mixture were compacted under a pressure of 350MPa and were bonded by sintering at temperatures ranging from 873K to 1173K for 1-5h. At 873k, the sound bi-mate-rials could not be obtained. In contrast, the bi-materials with the macroscopically well-bonded interface were obtained at higher temperatures than 873K. The length of well-bonded interface became longer with increasing temperature and time, indicating the improved contact in the interface between unreinforced Al-Mg part and Al-Mg/SiCp composite part. The relative density in the bi-materials increased as the sintering temperature and time increased, and the bi-materials sintered at 1173K for 5h showed the highest density.
이인규,이상웅,강계명,장시영,Lee In-Gyu,Lee Sang-Woong,Kang Kae-Myung,Chang Si-Young 한국재료학회 2004 한국재료학회지 Vol.14 No.12
Heat flow characteristics in the newly developed Wave Heat Sink were analyzed under natural and forced convections by Icepak program using the finite volume method. Temperature distribution and thermal resistance of Wave Heat Sink with/without air vent hole on the top of fin were compared with those of a commercial Al extruded heat sink(Intel Heat Sink). Under the natural convection, the maximum temperature was $45.1^{\circ}C$ in the air vent hole typed Wave Heat Sink, which was superior to that of Intel Heat Sink. The thermal resistance was $2.51^{\circ}C/W$ in the air vent hole typed Wave Heat Sink, and it changed to $2.65^{\circ}C/W\;and\;2.16^{\circ}C/W$ with changes of gravity direction and fin height, respectively. Under the forced convection, the maximum temperature became lower than that under the natural convection. In addition, the thermal resistance lowered in the air vent hole typed Wave Heat Sink with higher fin height and it decreased with increasing the air flux.
대학생들의 캠퍼스 벚꽃터널 산책로 이용 만족도와 이미지 선호도 평가
이인규,엄붕훈,Lee, In-Gyu,Eom, Boong-Hoon 한국환경과학회 2019 한국환경과학회지 Vol.28 No.12
This study investigated Post-Occupancy Evaluation (POE) of cherry blossom trails 'Cherry Road' in Daegu Catholic Univ. campus, at Gyeonsan-city, Korea. The evaluation focused on image preference and satisfaction of users i.e., students, using questionnaire surveys. A total 201 questionnaire samples were analyzed and most of the respondents were in the age group of 20. Frequency analysis was conducted on demographics, use behavior, reliability, and means. Factor analysis and multiple regression analysis were conducted for user satisfaction and image preference. Over 80% of visitors came with companions during daytime. The most common motives for use were strolling and walking, event and meeting, passing. For user satisfaction the mean scores were highest for landscape beauty (4.22), image improvement (4.14), campus image (4.08). Night lighting facility received the lowest score (3.32). Factor analysis concerning user satisfaction was categorized into environment-human behavior and physical factors. Multiple regression analysis showed that the overall satisfaction of user was significantly influenced by five independent variables: 'harmonious' (β=.214), 'night lighting facility' (β=.173), 'landscape beauty' (β=.208), 'lawn care' (β=.154), and 'walking trails' (β=.123). The mean scores of image variables were highest for 'beautiful' (5.81), 'bright' (5.67), and 'open' (5.64). The lowest scores was for 'quiet' (4.47). Exploratory factor analysis led to three factors being categorized: aesthetics, comforts, and simplicity. Result of multiple regression analysis indicated that the preference of space image was significantly influenced by five variables: 'bright' (β=.397), 'refreshing' (β=.211), 'cool' (β=.219), 'clean' (β=.182), and 'natural' (β=.-142). Hence, Cherry Road has a high level of user satisfaction and image evaluation, which is interpreted as having various cultural events and value for students on campus. To improve the satisfaction of Cherry Road in the future, it is necessary to secure night lighting, to manage trash cans, and to secure rest space.
고활성 ITO (Indium-Tin Oxide) 나노 분말을 침전법으로 합성시의 공정 변수 및 존재하는 이온의 영향
이인규,노봉현,Lee, In-Gyu,Noh, Bong-Hyun 한국분말야금학회 2008 한국분말재료학회지 (KPMI) Vol.15 No.6
The objectives of this study were the development of a synthesis technique for highly active nanosized ITO powder and the understanding of the reaction mechanisms of the ITO precursors. The precipitation and agglomeration phenomena in ITO and $In_{2}O_{3}$ precursors are very sensitive to reaction temperature, pH, and coexisting ion species. Excessive $Cl^-$ ion and $Sn^{+4}$ ions had a negative effect an synthesizing highly active powders. However, with a relevant stabilizing treatment the shape and size of ITO and $In_{2}O_{3}$ precursors could be controlled and high density sintered products of ITO were obtained. By applying the reprecipitation process (or stabilization technique), highly active ITO and $In_{2}O_{3}$ powders were synthesized. Sintering these powders at $1500^{\circ}C$ for 5 hours produced 97% dense ITO bodies.
기혼 감염인의 배우자 통보 및 검사와 가족 간 노출 문제
이인규,Lee, In-Gyu 대한에이즈예방협회 2006 레드리본 Vol.72 No.-
HIV에 감염되었다는 것을 아는 것은 모든 사람에게 커다란 충격이다. 그 충격에서 어느 정도 헤어나면 곧 생활의 문제가 닥쳐온다. 완전히 다른 세계에 온 것처럼 어려움을 느끼는 초기 감염인들에게 도움을 주고자 실제 상담에서 많이 나온 가장 급하고 중요한 정보를 중심으로 4차에 걸쳐 싣고 있다.