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초신뢰성 시스팀에서의 공통원인 실패문제-공통원인의 내부적 효과 및 통계학적 원리의 관점에서
박범,고광호,김철수,김한경,오현승,Park, P.,Ko, K.H.,Kim, C.S.,Kim, H.K.,Oh, H.S. 한국전자통신연구원 1993 전자통신동향분석 Vol.8 No.3
This study involves a Common Cause Failure (CCF) problem on the ultra-high reliability required system development such as war game operations, nuclear power control, air traffic control, space shuttle missions, and large scale network communication system. The system situation problems are defined according to CCF, reliability and system fault identifications for the development cast verifications in the multi-version redundant software system. Then, CCF analysis of redundant system, system principles and statistical dependence are also described. This validation oh the CCF in the human software interaction system will notify software engineers to conceive what really is CCF contribution factor, not only the internal but the external ones.
자동차 Cockpit 설계를 위한 감성공학 프로세스 모델을 적용한 사용성 평가
홍성만 ( S. M. Hong ),유승동 ( S. D. Yu ),박범 ( P. Park ) 한국감성과학회 2001 추계학술대회 Vol.2001 No.-
감성공학을 적용한 자동차 개발 연구의 최근 동향은 감성공학을 부분적으로 편중적으로 적용하여 소비자의 감성을 수집하고 평가하여 자동차 개발에 필요한 데이터로 변환한 후 이를 설계에 적용하고 있는 추세로 자동차 설계에서의 구체적인 감성공학 적용 상세가이드라인에 대한 사용성 평가 사례가 매우 부족한 실정이다. 이에 본 연구에서는 감성공학 적용 자동차 Cockpit 설계를 위한 가이드라인 구축의 일환으로 동급 해외 차량과 국내 차량을 각각 1대씩을 선정하여 두 차량에서의 자동차 Cockpit 형상에 대한 비교, 분석을 통한 사용 편의성 평가 실험을 시행하였다. 그 결과 벤치마킹 대상 차량의 Cockpit 물리적 형상간의 서로 다른 감성 요소를 추출해 내어 감성공학 적용 자동차 설계 시 Cockpit Object의 위치 선정를 고려하여 설계할 수 있는 내부 일부 가이드라인을 제시할 수 있었다.
양성환,박범,최정화 한국산업안전학회 1999 한국안전학회지 Vol.14 No.4
The objective of this research is to review the ergonomic keyboard developed to prevent musculo-skeletal disorders from being occurred during keyboard work. It was studied by comparing it with the traditional keyboard after analyzing and comparing the trying performance and work advantages both the two keyboards. Twelve male subjects with no history of musculo-skeletal disorders participated in the experiment. The quantitative data such as trying speed, accuracy, performance time, and the number of typing errors were obtained from the HTT software that was adjusted for this experiment. RULA worksheet and the degrees of extension ulnar deviation on right and left wrist were used to analyze the upper body postures. The experiment results showed that the typing performance of the ergonomic keyboard decreased a little, but no significant difference statistically, compared with that of the traditional keyboard. On the work posture, the ulnar deviation during typing decreased in case of the ergonomic keyboard. But, the wrist extension was increased unexpectedly. Therefore, it can be regarded as these results occur due to the shape of wrist rest and the overall height of keyboard on a table. As a result, the reconsideration and redesign on the ergonomic keyboard are requested.
악력의 인간공학적 평가를 위한 접근 방법 : 들기 작업 자세의 경우 Case by the Manual Lifting
양성환,박범,갈원모 한국산업안전학회 1997 한국안전학회지 Vol.12 No.4
Manual lifting techniques are commonly defined in terms of the postures adopted at the start of the lift. Quantitative definition is problematic, however, because the absolute joint angles adopted to lift an object are influenced by task parameters, such as the initial height of the load. The main objective of this study is to investigate the grip strength of the both hands at the initial lifting points. The survey is conducted by measuring the compression force, anthropometric data and grip strength at the lifting postures for the subjects(n=50) who is assigned to their job as usual. The experiment is performed at the four lifting postures which involving the combination of two horizontal factors(H1 : 35 ㎝, H2 : 55 ㎝) and two vertical factors(V1 : 20∼80 ㎝, V2:47∼102 ㎝). The analysis result of lifting posture indicated that each H1-V1, H2-V1 combinations are about 60˚ and each H1-V2, H2-V2 combinations are about 30˚. There are significant differences on grip strength between 60˚ and 30˚ stooped posture. The results of this study can be provided a method defining lifting postures at the minimum grip strength. Also, it is eliminated a hazard of the injuries which are cumulative trauma disorders(CTDs) and back pain, increased a productivity and improved a welfare of workers.
양성환,김대성,박범,갈원모,강영식 한국산업안전학회 1998 한국안전학회지 Vol.13 No.4
The objective of this study is to conduct the prevention method using electromyography that is to resist the strain on L5/S1 disc and to measure the heart rate for the prevention of low back pain during lifting. EMG signals and heart rate were analyzed under the condition of fixed vertical factor (20∼80㎝), two horizontal factors (35㎝, 55㎝), and two weight factors (10㎏, 25㎏) 2 times per minute for each lifting task. Eight healthy male workers performed nine-step stretching exercises which were intensified back power at the L5/S1 disc for six months. After completion of the two trials, the results were compared. The results of this analysis show that EMG signals have more an effect on the weight than the horizontal factors similar to those analyzed previous study, and are decreased. Therefore, those exercises presented very efficient. Also, there are not statistically significant differences on the analysis result of heart rate between weight factors.
요배근력 측정 및 L5/S1 요추부하 평가에 관한 연구
양성환,김대성,박범 한국산업안전학회 1997 한국안전학회지 Vol.12 No.3
Recently, industrial accidents have been getting great damage to an enterprise management directly and indirectly, the industrial injuries of conventional type are decreasing : on the other hand, musculos-keletal injuries are trending to a rapid increase. This shows that most of carrying works have been performing in almost all production process and convey objects, machine equipment and work method. Then, they are made by unfitted design which doesn't consider physical condition of workers, so it causes them to bring about forceful motion. In this paper, it was used NIOSH standard the data of spot. The ergonomic design of machine equipment and the evaluation of biomechanical compression force at the L_5/S₁ and back power, intend to provide the basis which can be applied, compared, and analyzed between before process improvement and after.