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디지털 인간공학 시뮬레이션 기법을 이용한 작업자세 분석
김남두,임현준,박희석,차태인,Kim, Nam-Du,Yim, Hyun-June,Park, Hee-Sok,Cha, Tae-In 대한인간공학회 2007 大韓人間工學會誌 Vol.26 No.2
The objective of this study was to investigate the validity of the digital ergonomic simulation (DES) method as a prospective alternative to the ergonomic analyses conducted by experts. The DES method utilizes commercial digital manufacturing software, and can compute the RULA scores continuously throughout the simulated work cycle. It was shown in a case study that the accuracy and objectivity of the DES method are superior to those obtained by experts. Also, it was demonstrated that the DES method has a distinct capability to simulate and validate a proposed work plan. Major limitations of the current DES method lie in the extensive time and efforts required for accurate digital simulation, which may be overcome through an automatic module for RULA data acquisition and a motion capture system.
택배 기사의 업무 과중 해소를 위한 상하차 및 배송 보조 장비 설계
차진훈(Jin-Hoon Cha),곽유빈(Yoo-Bin Kwak),윤하정(Ha-Jeong Yoon),정희철(Hee-Chul Jeong),임현준(Hyun-June Yim) 대한기계학회 2022 대한기계학회 논문집. Transactions of the KSME. C, 산업기술과 혁신 Vol.10 No.1
지속적인 택배 물동량 증가에도 불구하고 택배 단가는 낮아지고 있다. 이에 따라 택배 기사들의 근무 강도가 높아졌다. 택배 기사의 애로사항을 VOC(Voice Of Customers) 수집을 통해 직접 듣고 택배시스템을 개선하기 위한 장비를 설계했다. 장비에 배달물을 적재한 후 탑차에 일괄적으로 실을 수 있다. 배송지에서는 볼스크류에 체결된 판재로 배달물을 탑차 문 앞까지 밀어주어서 탑차에 올라가지 않고 배송이 가능하다. NIOSH 방정식을 이용해 인간공학적 관점에서 장비의 작동이 근무자에게 과도한 작업 부하를 일으키지 않는다는 것을 확인했다. 유한 요소법을 이용하여 응력 해석을 진행하고 장비의 안전계수를 확인했다. We designed a equipment to improve the courier system by listening to the voice of customers. It can be easily loaded into the truck cargo room after arranging all the courier items into the equipment. Because plates fastened to ball screws push the box to the rear door of the truck, the delivery man does not need to go aboard the cargo room to get it. Using the NIOSH equation, we confirmed that the operation of the equipment does not require much effort of the worker. Stress analysis was also carried out using the Finite Element Method (FEM) and the equipment was proved to be structurally safe.
이방성 탄성 매질에서의 초음파 거동에 대한 수치적 연구
任賢準,李春栽 弘益大學校 科學技術硏究所 2001 科學技術硏究論文集 Vol.12 No.-
The rectangular mass-spring lattice model (MSLM) is applied to the numerical modeling of ultrasonic inspection of austenitic welds. The model has been previously developed for unidirectional composites. And, the weld is modeled as homogeneous and transversely isotropic. Fundamental problems such as propagation, reflection, refraction, and diffraction, involved in such an inspection, are simulated using the numerical model. Numerical results in all these problems have agreed excellently with the analytical results, if any, and with previous results in the literature, in all respects. As a synthetic problem, a simple model of austenitic weld and its ultrasonic inspection have successfully been simulated using the numerical model. It may be concluded that the capability of the MSLM to numerically model the ultrasonic inspection of austenitic welds has been manifested in this paper. Yet, to further develop a model valuable in the field, significant efforts will be required.
균열에 의한 초음파 산란 현상의 해석해 계산 프로그램 개발
任賢準,李東厚 弘益大學校 科學技術硏究所 2000 科學技術硏究論文集 Vol.11 No.-
Analytical solutions are sought for the scattering of a plane longitudinal ultrasonic wave by a semi-infinite crack embedded in an infinite elastic medium. Stress formulation for exact solution to this problem, available from the literature, is modified and extended for displacement fields. In the formulation, the Wiener-Hopf technique and the Cagniard-de Hoop method are used to solve the mixed-boundary problem. The angular distribution of the displacement magnitude due to the diffracted longitudinal wave is obtained for various angles of the incident longitudinal wave, several characteristics of the diffracted wavefield have been observed: for example, the displacement fields are symmetric with respect to the crack faces. In order to confirm the accuracy of the formulation and program for the exact solution, the results are compared with the approximate solution obtained by the geometrical theory of diffraction. It has been found that the two solutions for the longitudinal diffracted wave agree well with each other in terms of their angular distributions. Though the exact solutions for further similar problems must be found and confirmed, the analytical solutions and the programs developed in this study will play an indispensable role in the development of a reliable ultrasonic simulator.
초음파검사의 수치적 모델링 기법 : 유한차분법 및 유한요소법
임현준,유승현 한국비파괴검사학회 2000 한국비파괴검사학회지 Vol.20 No.2
초음파검사에서 발생하는 물리적 현상의 복잡성을 고려할 때, 이를 이론적으로 모델링하기 위해 수치적인 기법을 이용하는 것이 효과적인 경우가 많다. 본 논문에서는 초음파검사를 수치적으로 모델링하는 기법들에 대하여 개괄적으로 살펴보고, 특히 유한차분법과 유한요소법에 대하여 상세히 알아본다. 즉, 유한차분법과 유한요소법을 이용한 해석의 개요를 설명하고, 이들의 적용시 고려사항 및 문제점에 대해 알아 본 후, 기존의 연구결과 중 중요한 것들을 참고문헌으로 열거하고 몇 가지 예를 소개한다. 계속되는 컴퓨터의 기술적 발전으로 인하여 초음파검사에 대한 수치적 모델링 기법의 신뢰성과 편의성이 지속적으로 증대될 것으로 기대된다. Due to the great complexity of the physical phenomena involved in most ultrasonic nondestructive testing, the numerical method is effective in many cases of their theoretical modeling. A brief overview is provided in this paper of the numerical methods used in modeling ultrasonic nondestructive testing, with an emphasis on the finite difference and the finite element methods. The procedures of execution, special considerations required, and some previous research results of the finite difference and the finite element methods are presented, with a rather extensive list of work reported in the literature. These numerical modeling techniques for ultrasonic nondestructive testing are expected to be more reliable and more convenient, as a result of the continuing technological development of computers
원형구멍과 원형 강체개재물에 의한 2차원 탄성파 산란현상의 주파수 해석
任賢準,金雄起 弘益大學校 科學技術硏究所 1997 科學技術硏究論文集 Vol.8 No.-
The characteristics of elastic waves scattered from a circular hole and circular rigid inclusion have been studied. It was found that the shape of partial waves of the scattered elastic waves change according to the property and size of the scatterer. It was observed that the peaks and dips in the partial scattered waves from a circular hole and those from a rigid inclusion are switched. It was also found that as the radius of scatterers increases, the modulus of the partial waves increases and the peak-to-peak frequency intervals decrease. The relation between scattering from a circular hole and a rigid inclusion, and their resonance was addressed in terms of circumferential waves around the scatterers. The result of this can be utilized as a good foundation for elastic wave scattering from elastic inclusions of similar geometrical shape.
김학현,임현준,이광명,조남준 한국비파괴검사학회 2000 한국비파괴검사학회지 Vol.20 No.3
콘크리트 비파괴검사법인 충격공진법의 유용성과 적용 한계를 살펴보기 위하여 실험 및 이론적 연구를 수행하였다. 실험적 연구를 위하여, 다양한 개재물이 포함된 콘크리트 슬래브 공시체를 제작한 후 충격공진법을 적용하여 개재물의 존재 및 매설 위치를 찾아보았다. 공시체들 중 몇 경우에는 개재물의 위치를 정확하게 검출할 수 있었으나, 나머지의 경우에는 검출하지 못하였다. 후자의 경우에 있어서 그 실패 원인을 규명하고, 나아가 본 기법의 유용성을 결정하는 주요 인자들을 알아보기 위하여 유한요소 해석을 수행하였다. 본 연구는 충격공진법의 물리적 이해 증진과 향후 발전에 기여할 것이다. The usefulness and limitations of the impact-resonance method, which is a nondestructive evaluation (NDE) method for concrete, are studied by both experimental and theoretical methods. For the experimental study, several concrete slab specimens with various inclusions embedded were fabricated, and tested by the impact-resonance method. Some of the inclusions have been detected and accurately located, but some have not. The reasons for the failure in the latter cases have been investigated theoretically by using finite element analyses, from which the primary factors determining the success of the method have also been identified. This study will serve to enhance the understanding of the underlying physics and to improve the usefulness of the impact-resonance method as applied to concrete NDE.