• Proceedings of the KIEE Conference
• /
• 1997.07f
• /
• pp.2155-2158
• /
• 1997

This paper describes the performance improvement of dc TIG (Tungsten Inert Gas) welder. The TIG welder consists of single phase full bridge IGBT inverter which incorporates the high frequency transformer, the boost converter for improving the input power factor, and the arc start system. The arc will be generated without fail even when the extension cable between the torch and the power source is 100m long. In addition, the arc start system with a short dc output voltage will generate less EMI noise than the traditional arc start system with a high frequency output voltage. To demonstrate the practical significance of the proposed methods, some simulation studies are presented.

• 제어로봇시스템학회:학술대회논문집
• /
• 1993.10b
• /
• pp.446-450
• /
• 1993

In this paper we propose an arc welding robot system, where two robots works coordinately and employ the vision sensor. In this system one robot arm holds a welding target as a positioning device, and the other robot moves the welding torch. The vision sensor consists of two laser slit-ray projectors and one CCD TV camera, and is mounted on the top of one robot. The vision sensor detects the 3-dimensional shape of the groove on the target work which needs to be weld. And two robots are moved coordinately to trace the grooves with accuracy. In order to realize fast image processing, totally five sets of high-speed parallel processing units (Transputer) are employed. The teaching tasks of the coordinated motions are simplified considerably due to this vision sensor. Experimental results reveal the applicability of our system.

• Proceedings of the Korean Society For Composite Materials Conference
• /
• 2005.04a
• /
• pp.98-101
• /
• 2005

The mechanical and thermal properties of PAN-based/Rayon-based carbon fabrics interply hybrid composite materials have been studied. Mechanical properties was improved with increasing amount of continuous PAN-based carbon fabrics. The erosion rate was calculated through torch test. The thermal conductivity of hybrid of spun PAN-based/continuous rayon-based carbon fabric is lower than others.

• The Microorganisms and Industry
• /
• v.19 no.2
• /
• pp.45-48
• /
• 1993

13억의 인구와 370만 평방마일의 영토를 가진 중국은 공산주의 경제체제에서 자본주의 경제체제를 도입하여 시장개방, 자유경쟁 경제방식으로 전환함에 따라서 급격한 경제성장을 이루어 국제통화기금(IMF)의 1993년 보고에 의하여 국내총생산액(GDP)가 1조 6천억$로 미국, 일본에 이어 세계 3위의 경제 성장을 이루어 경제강대국으로 부상하고 있고 아울러, 무한히 넓은 땅덩어리와 천연 및 인적자원을 기초로 한 앞으로의 성장잠재력이 크게 기대되어 미국, 일본을 비롯한 선진국이 중국에 대한 투자를 다방면으로 검토하기 시작했고 생명공학분야도 예외없이, 연구분야에는 포장시험, 임상시험 등 실용화 연구에 중국측 강점을 이용한 협동연구, 중국정부 자체가 상업화 가능성이 높다고 판단하는 Torch High Technology Development Center에의 외국기업이나 연구소의 참여 등으로 확대되고 있다. 산업계는 벤쳐 케피탈의 활성화를 통한 첨단기술에 대한 투자를 적극적으로 실시하는 한편, 제약 및 생명공학분야의 합작투자를 통해서 외국의 기술, 장비, 자본 및 노하우를 도입하고 있다. 우리나라는 여러 산업 분야에서 대중국 투자 또는 협력이 활발히 이루어지고 있지만, 생명공학 분야는 그렇지 못한 것 같다. 연구개발의 국제경쟁력은 우리나라의 자체 연구개발도 중요하지만, 아울러, 외국에 대한 연구 동향을 파악함과 가능한 분야에 대한 투자와 협력을 통한 공동관심과제의 도출은 중요한 의미를 갖는다.

• Journal of the Korean Society for Precision Engineering
• /
• v.21 no.12
• /
• pp.84-91
• /
• 2004

A CCD camera with a laser stripe was applied to realize the automatic weld seam tracking in GMAW. It takes relatively long time to process image on-line control using the basic Hough transformation, but it has a tendency of robustness over the noises such as spatter and arc tight. For this reason, it was complemented with adaptive Hough transformation to have an on-line processing ability for scanning specific weld points. The adaptive Hough transformation was used to extract laser stripes and to obtain specific weld points. The 3-dimensional information obtained from the vision system made it possible to generate the weld torch path and to obtain the information such as width and depth of weld line. In this study, a neural network based on the generalized delta rule algorithm was adapted for the process control of GMA, such as welding speed, arc voltage and wire feeding speed.

• Proceedings of the KAIS Fall Conference
• /
• 2009.12a
• /
• pp.167-170
• /
• 2009

최근 에너지 사용이 획기적으로 증가함에 따라 효율적인 에너지 사용이 필요하게 되었다. 특히 건물에서 벽체보다 에너지 손실이 많이 발생하는 창호의 경우 단열성능이 좋은 고효율 진공유리의 사용이 절실하나, 가격 및 성능 등의 문제로 보급화가 늦어지고 있는 실정이다. 본 연구에서는 저가형 고효율 진공유리 개발을 위한 기초 연구로써 유리 용접용 수소-산소 혼합가스 토치 개발하기 위한 열해석을 수행하였다. 주로 토치의 형상, 노즐 배치 및 직경 변경을 통한 토치 최적화를 수행하였다.

• 한국신재생에너지학회:학술대회논문집
• /
• 2009.06a
• /
• pp.802-805
• /
• 2009

생활폐기물을 플라즈마 가스화하고 얻어지는 합성가스로부터 수소를 생산하는 파일럿플랜트 건설 계획을 소개한다. 이 파일럿플랜트는 현재 가동 중인 청송군의 10톤/일급 플라즈마 가스화 시설을 고농도 합성가스를 생산하는 시설로 변경하고 수소전환반응기와 수소 PSA 장치를 부착하여 99.999% 순도의 수소 $200Nm^3/h$을 생산하여 연료전지 발전하는 것으로 계획되어 있다. 이 파일럿플랜트는 $20Nm^3/h$ 급의 폐기물 플라즈마 가스화 - 고순도 수소 생산 기술개발 완료에 이은 상용화 실증 시설이다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
• /
• 2000.10a
• /
• pp.642-646
• /
• 2000

The use of neural-fuzzy system to model mesh seam welding is described in this paper. Conventional, automated process generally involves sophisticated sensing and control techniques applied to various processing parameters. Welding parameters affecting quality include the arc voltage, the welding current torch travel speed and the pressure and so on. The relationship between the welding parameters and weld quality is not a direct one, md' in addition, the effect of the weld parameter variables are not independent of the each other. The effectiveness of the proposed neuro-fuzzy algorithms is demonstrated by computer simulations.

• Journal of the Korea Institute of Information and Communication Engineering
• /
• v.4 no.5
• /
• pp.937-942
• /
• 2000

This paper describes for applications of neural networks in the field of arc welding. Conventional, automated process generally involves sophisticated sensing and control techniques applied to various processing parameters. Welding parameters affecting quality include the arc voltage, the welding current and the torch travel speed. The relationship between the welding parameters and weld quality is not a direct one, and in addition, the effect of the weld parameter variables are not independent of the each other - changing the welding current will affect the arc voltage, and so on. Finally, a suitable proposal to improve the construction of the model has also been presented in the paper.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
• /
• 1998.11a
• /
• pp.323-326
• /
• 1998

The current-voltage characteristic have been measured in a gas stabilized DC arc generated in a non-transferred arc plasma torch operating on a mixture of argon and nitrogen. Relation between voltage and current to these arcs has been examined by plasma power and current under different flow rates and gas mixture ratios. Firstly, the voltage and current of arc plasma used argon was measured and secondly, in argon-nitrogen mixed gas regime, the flow rate of nitrogen was increased slowly. When the flow rate of nitrogen was increased, electrode drop of potential was increased.