• Proceedings of the KAIS Fall Conference
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• 2010.11b
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• pp.817-819
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• 2010

납은 인체에 치명적인 물질이다. 어린이는 물론 성인도 납에 노출되면 고혈압, 소화불량, 신장손상, 신경부조화, 수면장애, 근육통, 관절통 등을 유발하며 조울증의 원인이 되기도 한다. 따라서 가솔린, 페인트, 음식캔 등에 널리 사용되던 납은 80년대 이후 그 사용이 거의 금지되었으나 자동차산업에서는 경제적인 이유로 인하여 아직도 배터리 제조 등에 그 사용이 줄어들지 않고 있다. 현재 국내에는 약 20만 톤의 납이 자동차의 일부로 거리에서 움직이고 있다. 이에 본 연구에서는 자동차산업의 납 사용실태를 파악하고 이의 대체수단에 대하여 검토해 보고자 한다.

• Journal of environmental and Sanitary engineering
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• v.19 no.1
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• pp.42-49
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• 2004

The study was carried out in order to improve the quality of fermented soybean, that is, Doenjang with strain ,mold and bactea, added mulberry leaves powder were investigated and analyzed as follows. 1. The water content of samples was 38.51-50.10%, pH value 5.44-6.21 and total acidity, 2.42-3.13 2. The reducing sugar of content for samples was 7.01-7.24% on contrast mulberry added sample was 8.34-12.11%, Amino-N as contrast 5.96-7.63% mulberry added, 8.34-12.11% 3. In sensory evaluation test, excellent results was 2% added sample than others. 4. The heaby metals analyzed form samples cans, iron, tin and lead content of samples were 5.63-6.03 ppm, 31.70-35.53 ppm and trace.

• Journal of environmental and Sanitary engineering
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• v.22 no.1 s.63
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• pp.37-47
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• 2007

In order to improve the Quality of fermented soybean Doenjang was investigated. The samples were prepared and fermented by the koji made with A. oryzae, B. subtilis and B. natto strains, that the product added green tea powder with sanitary canned food. 1. The water content of sample was 50.30-42.14%, pH value 6.03-5.52 and total acidity, 3.01-3.87. 2. The reducing sugar content for samples was 9.35-7.81%, Amino-N, 7.96-9.21%. 3. In the sensory evaluation test, the good sensory qualify that was S-2 sample than to S-1 and S-3. 4. The heavy metals analyzed from sample cans, tin, iron and lead content were 27.31-29.04 ppm, 5.32-5.91 ppm and trace amount.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2000.11a
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• pp.628-632
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• 2000

In the recent day, shielding can was made of permalloy materials for automobile display instrument. The good roundness has an effect on magnetic property such as the low coercivity and the high permeability. But the products having the roundness is transformed by the heat treatment, the sending to the company and the assembly process. So for the stiffness of the edge, it is necessary for hemming process to be added in the deep drawing process. And it has the good appearance to create a smooth edge rather than a razor edge with urr. In this paper, it is controlled to get the best hemming product by the Pre-hemming angle($105^{\circ}$, $120^{\circ}$, $135^{\circ}$). And Possible process and tool design modification, which may lead to quality improvement in hemming were tested experimentally and using FEM. The commercial finite element program PAM-STAMPTM was used to simulate the pre-hemming process and hemming process, and the predictions were compared with experimental results according to the pre-hemming angle.

• Proceedings of the KIEE Conference
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• 1992.07a
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• pp.506-507
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• 1992

When it comes to the 'Leak Detector System' generally, our country has a large income 'Rotary Type Leak Detector' of foreign goods. The completed development of the 'Line Type Leak-Detector' system was produced to check Whether the containers for small and large on the filling line are auto defective. This system is applied to the filling package Processing during the production and contributed to inproving competiveness of domestic containers manufactures of all society of Industry. Also, high precision and realiablity, very compact size, low cost and Easy set-up etc. by checking the experimental data directly plan, Design and making for '1 Compression Head Control Leak Detector System'. This flexcible system can be equipped with multiple Compression heads depending on the requested prodution test rate and test precision.

• Proceedings of the KSME Conference
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• 2001.11a
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• pp.459-464
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• 2001

The main object of this study is to develop a reliable FEM simulation technique for the analysis of Steel D&I Can bodymaking process using ABAQUS software. The body making process includes drawing, redrawing, 3 step ironing, doming. The newly developed FEM code in this research is based on the previous research achievement of POSCO for the drawing, redrawing and ironing process. The analysis is performed using two dimensional axisymmetric elements to analyze the punch force, the height of can, the distribution of residual stress and strain. The effect of blank thickness, gap of ironing die is also analyzed.

• Proceedings of the Korean Society of Propulsion Engineers Conference
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• 1999.10a
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• pp.10-10
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• 1999

금속성형공정은 칩의 발생 없이 금속의 모양을 큰 소성변형으로 유용한 임의의 형태로 변화시키는 금속가공의 한 분야로써 제품을 생산함에 있어서 생산에 소요되는 시간을 최소로 줄이면서 기계적 성질이 우수한 제품을 생산하는 방법이다. 소성가공 공정에서 성형하중은 금형의 파손 및 마모에 영향을 미치고, 금형이 과도한 탄성변형으로 인한 제품의 치수 정밀도 저하시키기 때문에 성형하중 저감 설계는 소성가공 공정 설계에서 중요한 인자로 작용하고 있다. 원통형 제품을 성형하는데 주로 이용되고 있는 압출공정은 펀치 진행 방향과 동일한 방향으로 제품이 성형되는 전방압출 공정과 펀지 진행 방향과 반대로 제품의 성형되는 후방압출 공정으로 구분된다. 후방압출공정은 튜브 형성의 제품, 포장용 캔 및 변속장치 부품등을 생산하는데 주로 사용되는 공정으로서, 우수한 표면상태, 치수정밀도 및 향상된 기계적 성질을 얻을 수 있으며 높은 생산성과 낮은 제조원가를 얻을 수 있는 장점이 있다.

• Proceedings of the Korean Society of Fisheries Technology Conference
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• 2000.10a
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• pp.307-308
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• 2000

어류에 축적된 유기화합물은 생식소와 생식세포에 직접적인 작용으로 수정을 저해(Spies et al., 1988)하고 부화율(Hose et al., 1982)을 감소시킬 수 있다. Bishenol A(BPA)는 음식용기와 음료 포장재료로 사용되고 있으며, 캔 용기, 병 뚜껑 그리고 물 공급용 파이프 등에 금속을 코팅하는 물질이다. 이 연구는, 내분비장애물질이 생물의 번식력과 종 연속성에 미치는 영향을 규명하는 연구의 일환으로, 송사리, Oryzias latipes의 수정란을 BPA에 침적처리 하였을 때 수정난의 초기발생에 미치는 영향과 송사리 어미에 BPA를 경구투여 하였을 때 산란량과 부화율에 미치는 영향을 번식생물학적 측면에서 탐색하였다 (중략)

• Journal of the Korean Society of Manufacturing Process Engineers
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• v.3 no.3
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• pp.58-63
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• 2004

In the present work a finite element formulation using dynamic-explicit time integration scheme is used for numerical analysis of multi-stage stamping processes. The lumping scheme is employed for the diagonal mass matrix and dynamic explicit formulation Multi-Stage stamping is analyzed by using dynamic-explicit finite element method. Further, the simulated results for the panel stamping processes are shown and discussed. Its application is being increased especially in the stamping industrial area for the cost reduction, weight saving, and improvement of strength.

• The Transactions of the Korean Institute of Power Electronics
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• v.5 no.4
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• pp.409-416
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• 2000

In case of operating two converters in parallel with ZCT operation method using one current sensor for fault tolerance by system characteristics, identifying fault detection and isolation is difficult of which converter is fault since the ZCT output is a difference of two converters' supply current when a converter has fault. This thesis suggest a fault detection and isolation method of converter in case of operating two converters in parallel for fault tolerant system and verified this suggested method through an experiment.