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이춘만(Choon-Man Lee),노영화(Young-Hwa Roh),박동근(Dong-Kun Park) 한국생산제조학회 2006 한국공작기계학회 춘계학술대회논문집 Vol.2006 No.-
This study is concerned about the development and performance evaluation of a tower type ATC(Automatic Tool Changer). Recently, many studies have been undergoing to reduce working time in field of machine center. Tower type ATC have been developed to reduce the stand-by time by shortening tool exchanging time. The developed system can store more number of tools in small space. In order to evaluate the performance of tower type ATC, feeding speed and noise are measured by a laser interferometer and a noise level meter.
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이춘만(Choon-Man Lee),노영화(Young-Hwa Roh),박동근(Dong-Kun Park) 한국생산제조학회 2006 한국생산제조시스템학회 학술발표대회 논문집 Vol.2006 No.5
This study is concerned about the development and performance evaluation of a tower type ATC(Automatic Tool Changer). Recently, many studies have been undergoing to reduce working time in field of machine center. Tower type ATC have been developed to reduce the stand-by time by shortening tool exchanging time. The developed system can store more number of tools in small space. In order to evaluate the performance of tower type ATC, feeding speed and noise are measured by a laser interferometer and a noise level meter.
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축소형 액체로켓엔진에서 기체산소/케로신 및 기체아산화질소/에탄올 연소 분무의 비교
최송이(Songyi Choi),신봉철(Bongchul Shin),이건웅(Keonwoong Lee),김도헌(Dohun Kim),구자예(Jaye Koo),박동근(Dong-Kun Park) 한국추진공학회 2015 한국추진공학회지 Vol.19 No.4
Reactive sprays of two propellant combinations(GOx/kerosene and GN₂O/ethanol) were observed and compared with each other as a basic research of visualizing supercritical combustion. A shadowgraph imaging method was used to visualize the reactive sprays, and shadowgraph images were converted to density gradient magnitude images to analyse the structure of reactive sprays. The gas-liquid interface of GOx/kerosene spray showed rougher boundary and steeper density gradient near the injector face than the N₂O/ethanol at similar combustion chamber pressure. Spray core length was calculated from averaged density gradient magnitude images and it was revealed that spray core length of GOx/kerosene was shorter than that of GN₂O/ethanol, although momentum flux ratio of GOx/kerosene propellant combination was lower.
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이춘만,노영화,박동근 한국공작기계학회 2006 한국공작기계학회 추계학술대회논문집 Vol.2006 No.-
This study is concerned about the development and performance evaluation of a tower type ATC(Automatic Tool Changer). Recently, many studies have been undergoing to reduce working time in field of machine center. Tower type ATC have been developed to reduce the stand-by time by shortening tool exchanging time. The developed system can store more number of tools in small space. In order to evaluate the performance of tower type ATC, feeding speed and noise are measured by a laser interferometer and a noise level meter.
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A Study on the relations between the type of Gymnastic teachers and Self-motive of students
Kim,Jung Sik,Han,Chul Eun,Kim,duck Chun,Kim,Ki Ho,Jang,Sung Gon,Park,Dong Kun,Park,Moon Hwan 순천향대학교 기초과학연구소 1998 순천향자연과학연구 논문집 Vol.4 No.1
It was the purpose of this study to inquire into the mutual relations between the assigned types of gymnastic teachers of primary school and self motive of students. First : In the field of gymnastic teaching of primary schools, the figures of internal factors influencing children were calculated in order of importance as exchange teacher, specialized-teacher and class-teacher. second : In the process of gymnastic lesson, the differential effect between male and female was statistically in-significant for the exchange teachers. All of the internal-factors other than aspect of efforts/importance were statistically significant for the specialized teachers. Third : In the aspect of "interest", "efforts/importance", "realized self-confidence" and "stimulus/mental pressure", the figures of co-relations were statistically highly co related and the effects of self-motivation were statistically significant in the aspects of types of teachers, sex of children and co-relations between types of teachers and sex of children. Forth : In gymnastic lesson, taken by class teachers, the aspects of interest and stimulus/mental pressure were statistically highly significant for the boys, and those of realized self-confidence and stimulus/mental pressure were highly evaluated for the girls. There was no difference male and female teachers.
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