• Transactions of the Korean Society of Mechanical Engineers A
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• v.32 no.10
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• pp.897-904
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• 2008

Egg grading machine is used in poultry raising industry to classify eggs by their weight and to pack up them. Packer holder mechanism is a main part of the egg grading machine, of which role is to take eggs fallen from conveyor belt, and afterward to transfer eggs vertically to mold tray. The vertical motion of packer holder is usually driven by slider-crank mechanism or cam. This paper describes development of the cam in packer holder based on kinematic analysis of packer holder mechanism and measurement of acceleration and noise of the cam to verify performance of it. Several cams that are designed and manufactured by the author of this paper according to different design specification are compared to determine the best solution for egg transfer in the packer holder mechanism.

• Journal of the Korean Society for Precision Engineering
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• v.24 no.4 s.193
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• pp.123-130
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• 2007

Recently, a lot of work and interest have been devoted to the development of multiaxial fatigue parameters for fretting fatigue life prediction. In this study, the fretting fatigue lift and critical location ware estimated and evaluated through the multiaxial fatigue theories in a cylinder-on-flat contact configuration far Cr-Mo steel, SCM420, the material commonly is used in gears of the automobile and rollers of the conveyor. The strain-life curve was obtained from fatigue test for SCM420. The Fretting fatigue life and critical location were estimated through stress distributions, SWT-parameters and FS-parameters obtained from FEA. This paper showed possibility of applying multiaxial fatigue theories to fretting fatigue lift prediction comparing predicted life with experimental results.

• Journal of Korean Society for Quality Management
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• v.20 no.2
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• pp.55-66
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• 1992

The sampling plan CSP-1 for continuous production was first proposed by Dodge in 1943. Continuous production refers to products which are flowing past the inspection station such as products moving on a conveyor belt. One important measure of the effectiveness of a CSP is the average outgoing quality(AOQ). A concept for a short run of production length time, denoted by AOQ(t), is provided. The assumption of a s-independence in CSP-1 is unrealistic. It is possible to relax the assumption of a s-independence. The need for Markov model in a continuous production process can be discussed in this paper. The Markov and renewal theory are used to describe the property of AOQ in CSP-1.

• Proceedings of the KIEE Conference
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• 2006.07b
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• pp.683-684
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• 2006

It is necessary to modify the state-of-the-art of speed control theory because of the phase asymmetry in the Linear Induction Motor (LIM)and for the constant speed control of mover using single vector control inverter system, it is important that primary stack is located in appropriated intervals in the 3D conveyer system using LIM. The dynamic characteristic analysis method of the vector controlled LIM using coupled FEM and control algorithm taking into account the movement is proposed. The focus of this paper is the analysis relative to selecting primary stack intervals in order to constant speed control in the 3D conveyer system using LIM.

• Proceedings of the KIEE Conference
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• 1994.07a
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• pp.325-329
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• 1994

This paper describes a compact design and control method of PWM inverter-mounted induction motor especially designed for reducing the size and weight considerably, which may be applied to the speed control system such as air conditionr,conveyor and textile mill, etc. To obtain higher power density without derating performance, a new mechanical configuration unifying the inverter circuit and motor is proposed. Also, through the use of current minimization control method during V/f operation it is possible to reduce the size of heat-sink related to the losses of power circuit. By the proposed design method, a compact inverter-mounted induction motor system of 1Hp is built and its validity can be verified through the experimental results.

• Proceedings of the Korean Society of Computer Information Conference
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• 2018.07a
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• pp.339-340
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• 2018

산업 현장에서 사용되는 산업용 로봇은 자동화 시스템 도입에 따라 큰 성장세를 보이고 있다. 본 논문에서는 컨베이어 벨트에 올라온 물체의 무게를 측정하고, 로봇 팔이 무게별로 물건을 지정 위치에 분류하는 시스템을 구현하였다. 또 로봇 팔끼리 서로 데이터를 주고받으며 데이터 값에 따른 동작을 수행하고 클라우드에 데이터 값을 업로드하여 쉽게 모니터링 가능한 로봇 팔을 이용한 무게 분류 시스템을 설계하였다.

• Proceedings of the Korean Society of Computer Information Conference
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• 2018.07a
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• pp.23-24
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• 2018

스마트 팩토리의 핵심 요소 중 하나인 AGV를 운용하기 위해서 스케줄링은 간과할 수 없는 문제이다. 기존의 정적인 휴리스틱 방식은 실시간으로 운용되는 스마트 팩토리에 다소 부적합한 면이 있다. 본 논문에서는 이러한 스케줄링에 관한 문제를 해결하고자 SLAM 기반의 자율주행 AGV를 운용 할 수 있는 3D 가상 환경을 설계하고 해당 환경에서 강화학습을 기반으로 한 스케줄링을 구현해 실시간으로 변화하는 공장에 적합한 동적인 스케줄링을 설계하였다.

• Proceedings of the Korean Society of Computer Information Conference
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• 2018.07a
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• pp.27-28
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• 2018

본 논문에서는 구동 장치의 다양한 상태를 나타내는 소음과 진동으로부터 특징데이터를 추출하여 이를 학습 한 후 실시간으로 장치의 상태를 진단하는 하였다. 실제 현장에서 발생할 수 있는 예측 외 소음환경에 유연하게 대처하기 위해 CNN모델 사용과 소리, 진동 데이터의 Butterworth filter와 Kalman filter를 적용하여 노이즈 배제처리 하였다. 제안된 시스템의 유용성을 확인하기 위해 제안된 시스템과 기존 CNN기반 시스템을 소음환경에서 비교 실험하였다.

• Journal of the Korea Society for Simulation
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• v.13 no.4
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• pp.17-29
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• 2004

The focus of this study is to represent a methodology of analysis for integrated logistic system by means of the Evolution Strategies and Data Envelopment Analysis(DEA). The integrated logistic system is composed of AS/RS (Automated Storages and Retrieval System), AGVs(Automated Guided Vehicle System) and Conveyor System. We design the simulation alternatives with choosing the qualitative critical factors for the each subsystem. Evolution Strategies is used to optimize the quantitative critical factors and responses of each alternative. DEA is applied to measure the efficiency of the alternatives in order to select the optimal operation efficiency scheme. The method of analysis which combines Evolution Strategies with DEA can be used to analyze the qualitative and quantitative critical factors in the integrated logistic systems.

• Journal of the Korea Safety Management & Science
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• v.5 no.1
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• pp.69-82
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• 2003

The sequence which minimizes overall utility work in car assembly lines reduces the cycle time, the number of utility workers, and the risk of conveyor stopping. This study suggests mathematical formulation of the sequencing problem to minimize overall utility work, and present a genetic algorithm which can provide a near optimal solution in real time. To apply a genetic algorithm to the sequencing problem in car assembly lines, the representation, selection methods, and genetic parameters are studied. Experiments are carried out to compare selection methods such as roullette wheel selection, tournament selection and ranking selection. Experimental results show that ranking selection method outperforms the others in solution quality, whereas tournament selection provides the best performance in computation time.