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A/S 및 필드데이터를 활용한 공작기계 시스템 신뢰도 산출
김근수(Keunsu Kim),황태완(Tae Wan Hwang),김수지(Su Jii Kim),전병주(Byungjoo Jeon),윤병동(Byeng D. Youn) 대한기계학회 2016 대한기계학회 춘추학술대회 Vol.2016 No.12
Machining tools of manufacturing equipment is often called “mother machine” as they make machines that support industries. Currently, there are in challenges of rapid, high accurate and durable processing. To satisfy these challenges, the reliability of the machine is needed. So we develop the reliability growth process and reliability evaluation techniques using warranty data and field failure data for the horizontal machining center. System reliability is calculated based on data with 8 years collected of manufacturing company and improved reliability result is estimated when fault diagnosis techniques is applied. test method and to use it with care by noticing the unreasonable changes in it.
실차에서의 샤크 핀 안테나와 노이즈 소스 간 전자기 노이즈 커플링 레벨에 대한 Full-Wave EM 시뮬레이션
김근수(Keunsu Kim),이영훈(Younghun Lee),허정길(Jeonggil Heo),박영덕(Youngduk Park),윤익재(Ick-Jae Yoon) 한국자동차공학회 2019 한국자동차공학회 Workshop Vol.2019 No.5
This study uses Full-Wave EM simulation to determine the noise level coupled between a blower motor mounted on a vehicle and a shark fin antenna. We build a model of the shark fin antenna and match impedance to change the receive frequency band from FM band to AM band. This shark fin antenna model is mounted on the roof of a vehicle model as it is mounted on a real vehicle. Small dipole and loop antennas are also modelled as source antennas to describe a blower motor noise source and mounted on the same place at which a real blower motor is. As a result, the S-parameter between the two antenna ports which shows the electromagnetic noise coupling is derived .
실차에서의 샤크 핀 안테나와 노이즈 소스 간 전자기 노이즈 커플링 레벨에 대한 Full-Wave EM 시뮬레이션
김근수(Keunsu Kim),이영훈(Younghun Lee),허정길(Jeonggil Heo),박영덕(Youngduk Park),윤익재(Ick-Jae Yoon) 한국자동차공학회 2019 한국자동차공학회 지부 학술대회 논문집 Vol.2019 No.5
This study uses Full-Wave EM simulation to determine the noise level coupled between a blower motor mounted on a vehicle and a shark fin antenna. We build a model of the shark fin antenna and match impedance to change the receive frequency band from FM band to AM band. This shark fin antenna model is mounted on the roof of a vehicle model as it is mounted on a real vehicle. Small dipole and loop antennas are also modelled as source antennas to describe a blower motor noise source and mounted on the same place at which a real blower motor is. As a result, the S-parameter between the two antenna ports which shows the electromagnetic noise coupling is derived .
공군사관학교 예비생도들의 기초군사훈련 주차별 신체활동 에너지 소비량 분석
김근수(Keunsu Kim),김정운(JungWoon KIM),이율효(YulHyo LEE),박정섭(JungSub PARK),고재연(JaeYeon KO) 육군사관학교 화랑대연구소 2014 한국군사학논집 Vol.70 No.3
본 연구는 공군사관학교 가입학 예비생도들을 대상으로 기초군사훈련 주차별 신체활동에 따른 에너지 소비량을 측정/분석하고, 4주 훈련 전·후 신체구성과 체력의 변화를 규명하여, 향후 기초군사훈련 단계별 훈련목표 설정과 입학 후 사관생도 체력관리에 유용한 자료를 제공하는 데 있다. 그 결과, 신체구성에서 체중, 체지방량, 체지방률, BMI는 감소하였고, 체중 1kg당 골격근량은 증가하였다. 기초체력 측정결과 눈감고 외발서기, 윗몸일으키기, 사이드 스텝은 증가하였으며, 앉아 윗몸 앞으로 굽히기는 감소하였다. 신체활동 에너지 소비량의 변화는 2주차 시기에서 증가한 후, 3주차에서 감소하고 다시 4주차에서 증가한 것으로 나타났다. 결론적으로, 공군사관학교 예비생도들의 기초군사훈련은 신체구성을 개선시키고 기초체력을 증가(유연성은 감소) 시키며 주차별 적절한 훈련 강도로 프로그램 되어 있음을 알 수 있다. The purpose of this study is to provide useful data for establishment of future training objectives by stage on basic military training through measuring and analyzing weekly energy consumption from physical activities, and through examining variations in physical fitness before and after the four weeks of training. To accomplish the objectives of this study, energy consumption from physical activities weekly basis(1~4 weeks) were measured and analyzed by utilizing accelerometer on the subject of 13 cadet candidates who entered the basic military training for 2013 entrance. In addition, the variation of physical fitness and body composition before and after the training were analyzed. All test results including averages and standard deviations were generated by Windows SPSS 17.0 Statistics Package. In order to verify the body composition and physical fitness before and after the military training, Paired t-test was used in the analysis, and Two-way ANOVA by Repeated Measurements were used for the weekly physical activities (p<.05). The results of this research are as follows. First, based on the analysis on body composition, average body fat percentage was decreased from 16.164.48% to 12.77±3.88%(p<.001). Second, after measurement of basic physical fitness, considerable statistical changes were observed in balance, situps, push ups, and side-steps; however, no considerable changes were observed in grip and standing long jump. Third, based on the analysis on energy consumption from physical activities, first week's results showed considerable statistical difference from every other week(second, third, and fourth week) (p<.001). There were no considerable statistical difference between the second and fourth week's results, but it showed attentive difference between second and fourth week's results (p<.001). As a result, this study suggests that overall body composition was improved. Balance, muscular endurance, agility were improved while flexibility was diminished, and weekly energy consumption were increased.