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이인규(In-Gyu Lee),김도형(Do-Hyoung Kim),김학성(Hak-Sung Kim) 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.2015 No.11
For the manufacturing of the polymer based composite materials, the understanding of curing process during high temperature is very important to improve the productivity and manufacturing process. However, the curing behavior of thermoplastic composite material is still not well understood although the cure monitoring system for thermosetting composite material was developed in many ways. Therefore, in this study, the in-situ phase change monitoring system was devised which can measure the phase change of thermoplastic composite in real time during the manufacturing process. To investigate the phase change process of thermoplastic composite, changing of dissipation points were obtained by using the dielectric sensor. Based on result, the optimal phase changing process of glass fiber reinforced thermoplastic composite could be devised which has the reduced curing time with better productivity.
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.
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.
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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.