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- 저자 : 김제용(Kim, Jeyong) (검색결과 6 건)
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일회성 무기체계의 필드 빅데이터 분석을 통한 신뢰도 예측 보정계수 추정
김지영(Jiyoung Kim),김제용(Jeyong Kim),이계신(Kyesin Lee),이연호(Younho Lee),김명수(Myungsoo Kim),정석문(Sukmoon Chung),한민석(Minseok Han) 한국신뢰성학회 2021 신뢰성응용연구 Vol.21 No.3
Purpose: This study aimed at developing a model that can improve the accuracy of reliability prediction through guided missile field big data analysis. Methods: All the relevant operational and field maintenance data was collected by cooperating with the maintenance organization within the military. A data purification method was adopted to analyze the collected data. Omissions and missing data were processed by using the results of a parallel review that was conducted by examining the results of the consultation session with the missile operation expert and the quality data of the missile producer. The actual data was analyzed at the level of military repair parts, and the correction factor was calculated. Results: Since the correction factor analyzed in this study was calculated at the component level, it can be applied to correct the predicted failure rate of components calculated when developing new weapon system projects in the future. It is possible to improve the accuracy of the analysis results in the field of element development, which requires the failure rate of the component unit. Conclusion: In this study, the reliability of a guided missile in the operations and maintenance phase was analyzed through field big data analysis of the missile. Based on the results, the reliability predicted during the R&D phase was corrected, and a methodology (correction factor) was applied to reduce the reliability gap.
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유상준(Yoo, Sangjun),김제용(Kim, Jeyong) 한국산학기술학회 2014 한국산학기술학회논문지 Vol.15 No.3
본 논문은 MIL-STD-662F의 방호한계속도 산출을 위해 충돌속도를 추정하는 새로운 방법을 제안하였다. 기 존 MIL-STD-662F의 방법은 충돌속도를 추정하기 위해 상대공기밀도, 항력계수, 형상인자, 탄도계수 등이 필요하여 기초연구가 필수적이라는 한계를 가지고 있다. 하지만 제안한 방법은 기초연구 없이도, 기기에서 측정된 속도와 측정 기기와 타격점까지 거리만으로 충돌속도를 추정할 수 있다. 이를 검증하기 위해 M193탄과 M80탄을 사용하였고, 미 국의 검증된 PRODAS의 데이터를 기반으로 MIL-STD-662F 방법의 충돌속도 추정값과 제안한 방법의 충돌속도 추정 값을 비교하고 분석였다. 실험결과에서 제안한 방법이 일부 속도구간에서는 MIL-STD-662F의 방법보다 오차가 크지 만 방호한계속도 산출은 가능하였고, 대부분의 속도구간에서는 MIL-STD-662F보다 오차가 작다는 것을 보였다. This paper proposes a new method to estimate the striking velocity for ballistic limit velocity in MIL-STD-662F. The method from MIL-STD-662F needs relative air density, drag coefficient, form factor, ballistic coefficient for estimating striking velocity. So precedent studies are essential. However, the new method can estimate striking velocity only using measured velocities and distance between the screen and the target. To prove new method, we compared estimation of striking velocity from both the new method and the method from MIL-STD-662F on the basis of datain PRODAS. The new method shows bigger errors in some velocity ranges. But it could still calculate ballistic limit velocity. It also shows smaller errors in most velocity ranges.
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차량 내 음향 장치의 음압수준 변화에 따른 사용자의 주관적인 지각 차이에 대한 연구
권상현(Sanghyun Kwon),반상우(Sangwoo Bahn),김제용(Jeyong Kim),강신규(Shinkyu Kang),윤명환(Myung Hwan Yun) 대한인간공학회 2010 대한인간공학회 학술대회논문집 Vol.2010 No.10
When people hear sounds through sound system, perceptive loudness of each sound pressure level varies with each level. This difference causes some confusion in adjusting volume level and designing the volume level of sound systems. According to previous studies, it is known that perceptive sensitivity of variation in sound pressure level depends on the sound pressure level and frequency of sound source. However, quantitative analysis on user’s perceptive sensitivity of sound level which they actually perceive from the change of sound pressure level has not been studied yet. This study aims to understand the perceptive sensitivity of variation in sound pressure level for some specific frequency bands. To this end, 118 sound samples (frequencies: 500 ㎐, 1 ㎑, 2 ㎑, sound pressure levels: from 40㏈ SPL to 100㏈ SPL) were evaluated by 27 participants (male: 17, female: 10) in the condition of driving automobile. Based on the results of subjective ratings of unit change of sound pressure level and 2㏈ SPL, the characteristics of perceptive sensitivity of variation in sound pressure level were identified. Also, through curve fitting analysis of the subjective rating results, perceptive sensitivity curves of each frequency were estimated. According to the results, when frequency is high, the perceptive sensitivity tends to be more sensitive than the case of low frequency and the sensitivity curve was estimated to have cubic relation. These results could be used to adjust the volume level of sound system in automobile to meet customer’s perceptive characteristics and needs.
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서양우(Yangwoo Seo),이계신(Kyeshin Lee),이연호(Younho Lee),김제용(Jeyong Kim) 한국신뢰성학회 2018 신뢰성응용연구 Vol.18 No.3
Purpose: Previously, missile reliability prediction is based on theoretical failure prediction model. It has shown that the predicted reliability is inadequate to real field data. Although an MTTF based reliability prediction method using real field data has recently been studied to overcome this issue. In this paper, we present a more realistic method, considering MTBF concept, to predict missile reliability. Methods: In this paper we proposed a modified survival model. This model is considering MTBF as its core concept, and failed missiles in the model are to be repaired and redeployed. We compared the modified model (MTBF) and the previous model (MTTF) in terms of fitness against the real failure data. Results: The reliability prediction result of MTBF based model is closer to fields failure data set than that of MTTF based model. Conclusion: The proposed MTBF concept is more fitted to real failure data of missile than MTTF concept. The methodology of this study can be applied to analyze field failure data of other similar missiles.
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이수열(Soo Yeol Lee),최효선(Hyo Sun Choi),김제용(Je Yong Kim),윤명환(Myung Hwan Yun) 대한인간공학회 2010 대한인간공학회 학술대회논문집 Vol.2010 No.5
근골격계질환에 대한 관심이 높아지고, 예방대책을 적용하려는 노력이 산업 전반으로 확산되고 있으나, 기존의 근골격계질환 연구와 그로부터 도출된 측정 기준이 주로 단순 반복 조립작업과 자료입력, 공구나 중량물의 취급과 같은 제한된 제조업 사업장의 남성 근로자를 대상으로 이루어져왔고, 여러 가지 작업 분야가 공존하는 비정형 작업장 근골격계질환의 현황 및 특성에 대한 연구가 부족한 실정이다. 본 연구에서는 다양한 작업동작이 비주기적으로 발생하는 비정형 작업장의 근로자들을 대상으로 근골격계질환 유발 요인을 규명하기 위해 사용자 관찰 기법을 활용하여 작업을 분류하고 특성을 파악하여 근골격계질환 증상 및 유해요인을 분류할 수 있는 방법을 제시하고, 이를 의료산업의 근골격계질환 조사에 활용하여 조사방법의 유용성을 확인하여 비정형 작업장의 근골격계질환 연구를 위한 방향을 제시하였다.
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