• 한국정보통신학회:학술대회논문집
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• 한국해양정보통신학회 2008년도 춘계종합학술대회 A
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• pp.632-635
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• 2008

최근 들어 공장자동화분야에 동시공학이라는 개념이 활용되고 있다. 본 논문에서는 판재를 절단하여 철의장 부품을 생산하는 작업 현장이 회사 내 외의 협업이 요구되는 환경임에도 불구하고, 분산화 된 동시공학적 생산개념이 적용된 사례가 없어 이와 관련된 연구를 수행하였다. 클라이언트/서버 환경의 철의장 부재생산 자동화시스템을 설계하고, 부재 절단에 필요한 NC포스트프로세서 구축기를 설계하였다. 또한 부재생산 전 공정을 동시공학적 분산처리를 수행했을 때 기존의 생산공정에 비해 제품생산에 소요되는 시간이 단축됨을 보였다.

• 한국정밀공학회지
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• 제24권3호
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• pp.108-116
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• 2007

To overcome many defects such as the high product cost, large energy consumption, and big space capacity in conventional mechanical machining, the miniaturization of machine tool and micro factory systems has been envisioned recently. The object of this paper is to research the effect of dynamic characteristic parameters in bolted-joint beams, which is widely applied to the joining of mechanical structures in order to identify structural system characteristics and to predict dynamic behavior according to scale-down from macro to micro system as the development of micro/meso-scale machine tool and micro factories. Modal parameters such as the natural frequency, damping ratio, and mode shape from modal testing and dynamic characteristics from finite element analysis are extracted with all 12 test beam models by materials, by size, and by joining condition, and then the results obtained by both methods are compared.

• Food Science and Biotechnology
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• 제17권1호
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• pp.172-175
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• 2008

Two new fermentation products were separated from cheonggukjang by high performance liquid chromatography (HPLC) and tentatively identified as succinyl daidzin and succinyl genistin by HPLC-mass spectrometry (MS). Both succinyl daidzin and succinyl genistin were detected in all 4 commercially available and one laboratory prepared cheonggukjang and 1 commercially available natto. However, these compounds were not detected in commercially available 4 home-made and 4 factory-produced doenjang. Peak areas of succinyl genistin were about 1.95-2.45 times higher than those of succinyl daidzin in cheonggukjang, which may be due to the higher concentration of genistin derivatives than daidzin derivatives in soybeans. This is the first report on the succinyl derivatives as isoflavone metabolites from cheonggukjang and these 2 isoflavone derivatives could be characteristic indicators for cheonggukjang.

• 여성건강간호학회지
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• 제10권3호
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• pp.226-234
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• 2004

Purpose: This study was to examine health status, reproductive health problems and the degree of prenatal management in working women. Method: The subjects were 902 married working women among 2,000 women selected by cluster sampling. The work area was classified to product factory, school, office, etc. After an Informed consent was obtained, participants were asked to fill out a self-administered questionnaire. The instruments included a questionnaire, parity check list, menstrual problems and gynecologic problem check list. Result: Many women have experienced menstrual cycle change during the past year. There was a significant difference in general health, menstrual regularity, reproductive health and prenatal management by occupation type. 40.6 percent of the subjects have gynecological problems such as menstrual cycle change, perineal inflammation, irregular vaginal bleeding, amenorrhea, ovarian/uterine disease, infertility, or abortion. Prenatal care was received in only 28.5% of the total subjects. In addition, 16.3% answered they had experienced low birth weight babies. Conclusion: We can conclude that working woman have changes in menstruation cycle and in reproductive health status. Therefore, we suggest that some occupational characteristics may affect subject's reproductive health, these should be clear and avoided as much as possible.

• Industrial Engineering and Management Systems
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• 제11권2호
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• pp.188-195
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• 2012

This paper presents a new mode of expressing a 3D assembly work for creating a 3D CG animation without judgment by human from minimal required information. In the field of manufacturing, there are favorable movements in the utilization of 3D CAD for 3D simulation to shorten lead time for product development and pre-production. But simulating an assembly work has troubles to need huge quantity of manually input data. This paper discusses what minimal necessary information for creating 3D CG animations of assembly works is, focusing on the features of assembly works. Furthermore, a new mode of expressing a 3D assembly work is proposed as "state/change transition diagrams" (SCTD), which express arbitrary scenes in an assembly work as "state" and describe a sequential assembly work with "state" and "change", and the outline of its stepwise generation algorithm is also described. SCTD can be converted to a 3D CG animation of an assembly work without judgment by human. This paper focuses on the creating 3D CG animation of assembly works which workers use only their both hands.

• 한국인터넷방송통신학회논문지
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• 제10권1호
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• pp.69-74
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• 2010

현재 CAN(controller Area Network)통신은 노이즈에 강인한 시리얼통신으로 전자모듈에 많이 사용하고 있다. 특히, CAN통신은 자동차 전자제어모듈, 엔진제어유닛, 센서모듈 등 자동차 부분에 많이 사용되는 방식 이지만 CAN 통신의 연결노드 우선순위와 오류가 낮아 공장자동화 라인에도 적용되고 있다. CAN통신은 기본적으로 전기 노이즈에 강인하여 적용가능한 분야가 다양하다고 사료된다. 본 연구에서는 High-Speed, Full-CAN에서 2개의 CAN Node를 사용하여 임베디드 시스템용으로 오류 검출이 가능한 CAN통신 인터페이스를 설계 하였다.

• 한국건설순환자원학회논문집
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• 제2권2호
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• pp.93-100
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• 2006

Building materials are trending toward environmental materials nowadays and the market share of those is growing. So those researches and developments for environmental property are proceeding now. The main properties of environmental products are far infrared emission, negative ion emission, electro magnetic wave shielding, and anti fungus, these products are used with shape of mortar, and spray on the finish material. But There are not much researches for the concrete, main material in construction field, with those functional properties. So in this research we evaluated slump, compressive strength and air content as basic properties for concrete using functional materials of sericite, wood pattern sand stone, carbon black and nanometric silver solution and functional properties like far infrared emission, negative ion emission, electro magnetic wave shielding, and anti fungus. The results were as follows. The most useful material in the functional materials was carbon black. Sericite and nanometric silver solution had a little effect on functional property, so it was difficult to apply to concrete, and wood pattern sand stone had a high functional property but low compressive strength, can be applied to a factory product. Anti fungus of the concrete using nanometric silver solution was not clear but if those specimens were aged in $CO_2$ gas for a long time it might apparent.

• 한국기계가공학회지
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• 제14권2호
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• pp.51-58
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• 2015

In this study, we developed an automated non-contact thickness measurement machine that continuously and precisely measures the thickness and warp of a PCB product using a laser sensor. The system contains a measurement part to measure the thickness in real time automatically according to the set conditions with an alignment supply unit and unloading unit to separate OK and NG products. The measurement machine was utilized to evaluate the performance at each step to minimize measurement error. At the zero setting for the initial setup, the standard deviation of the 216 samples was determined to be $5.52{\mu}m$. A measurement error of 0.5mm and 1.0mm as a standard sample in the measurement accuracy assessment was found to be 2.48% and 2.28%, respectively. In the factory acceptance test, the standard deviation of 1.461mm PCB was measured as $28.99{\mu}m$, with a $C_{pk}$ of 1.2. The automatic thickness measurement machine developed in this study can contribute to productivity and quality improvement in the mass production process.

• 한국자동차공학회논문집
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• 제19권1호
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• pp.38-44
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• 2011

Remanufacturing is restoring or manufacturing the worn-out or discarded components of an end of life product in order to bring it to the "like new" condition. The aim is to reprocess used products in such a manner that the quality of the products is as good as or better than the new one, in terms of appearance, reliability and performance. This paper investigates the automotive remanufacturing industry in Europe. To further knowledge in this field, the paper focuses on the remanufacturing of the automotive components of end-of-life vehicles. The paper scope emphasizes key remanufacturing companies, which are identified and were surveyed in terms of their business structures. The research aims to address the potential for growth within the remanufacturing industry, with regard to various players. The state of the art in remanufacturing of automotive equipment will be identified.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2005년도 춘계학술대회 논문집
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• pp.1587-1590
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• 2005

A rigid-plastic finite element analysis for the die forging process of a socket ball joint, which is used in the transportation system, was carried out. And also with the results, the elastic stress analysis for the forging die was performed in order to get basic data for the die life prediction. The die fatigue life prediction was simulated using Goodman's and Gerber's equation. The prediction technique for the fatigue life of a forged product, the socket ball joint, using DEFORM-3D is presented and the results are commented upon. Archard's wear model was used for the wear simulation and then the wear simulation and then the wear quantity was quantity was evaluated using volume. In order to prove the wear simulation results to be reliable, wear quantity of the real forging die set in used a forging factory was measured using a 3-dimensional measurement apparatus. The simulation results were relatively in good agreement with the experimental measurements.