• Proceedings of the Korean Society for Technology of Plasticity Conference
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• 2002.02a
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• pp.239-244
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• 2002

In this study, we developed the manufacturing technology of micro-hole and micro-shaft for micro punching system using micro electrical discharge machining and micro electro chemical machining. Micro punching dies of tungsten carbide with $55\;{\mu}m\;and\;110\;{\mu}m$ diameter and $250\;{\mu}m$ depth were made by micro electrical discharge machining. The form accuracy and surface roughness of die hole were pretty good and it was shown that the punched hole quality was fine. WC micro-shaft with $30\;{\mu}m$ diameter was made by the multistep micro electro chemical machining. The developed technologies can be effectively used in precision manufacturing of micro punching die and mass production of micro-shaft.

• Proceedings of the KAIS Fall Conference
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• 2010.05a
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• pp.132-134
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• 2010

In this paper new, inverter control system for TG feedback a formula Control was developed. The motor control system with TG feedback controller as an effect of load disturbance, it is very difficult to guarantee the robustness of control system. The function of the implementation are TG feedback type, and temperature scheme. The Inverter Control System approach is based on master-slave control concept. To show validity of the developed new inverter control system, severial experiments are illustrated.

• Proceedings of the KAIS Fall Conference
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• 2002.05a
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• pp.212-214
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• 2002

본 논문에서는 기존 공정 Line중 TG Feed Back방식을 이용한 Control System은 매우 고가(高價)인 외산 TG임에도 불구하고 구동 Motor의 발열로 인하여 전압 검출부 Cabon Brush의 잦은 마모로 인한 오동작으로 작업의 문제점이 표출되어 생산성이 저하되고 품질 불만 및 불량품 발생으로 생산성에 큰 손실을 입고 있다. 이러한 문제점을 해결하기 위하여 본 연구에서는 새로운 Inverter Control System을 개발하였다. 여기에 따른 파급 효과는 제품의 생산성 향상과 소모성 부품의 수입 대처 및 부분적 제어시스템의 국산화 효과를 확보 할 수 있다.

• Proceedings of the KAIS Fall Conference
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• 2001.11a
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• pp.173-176
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• 2001

A company needs to maintain its machines always workable in order to keep the manufacturing time minimal. If any troubles un, they should be fixed as soon as possible. But, the complexity of modem machines make the trouble shooting difficult. So, it is important that the monitoring system for automated production system to fix every trobule easily. In this paper new, inverter control system for TG feedback a formula Control was developed. The motor control system with TG feedback controller as an effect of load disturbance, it is very difficult to guarantee the robustness of Control System. The function of the implementation are TG feedback type, and temperature scheme. The Inverter Control System approach is based on master-slave control concept. To show validity of the developed new inverter control system severial experiments are illustrated.

• Proceedings of the Korea Concrete Institute Conference
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• 2008.04a
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• pp.17-20
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• 2008

As a part of a research program to study the shear reinforcement of flat plate system, this investigation aimed to determine the effect of shear reinforcement type on punching shear strength of monolithic slab-column connection. A total of 5 specimens were fabrication and tested. The dimension of the slab were $2.63{\ast}2.725{\ast}0.18m$, with a centrally located column $0.6{\ast}0.8m$ in cross section. Experimental results showed that the CFS shear reinforcement was not effective because of lack of proper bond with concrete. 3 shear reinforcement except of CFS showed high effectiveness, which resulted in a considerable increment of the punching shear resistance of the connection.

• Transactions of Materials Processing
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• v.16 no.4 s.94
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• pp.313-316
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• 2007

The purpose of this paper is the development of measurement algorithm for green-sheet based on the digital image processing technique. The Low Temperature Co-fired Ceramic(LTCC) technology can be employed to produce multilayer circuits with the help of single tapes, which are used to apply conductive, dielectric and/or resistive pastes on. These single green-sheets must be laminated together and fired at the same time. Main function of the green-sheet film measurement algorithm is to measure the position and size of the punching hole in each single layer. The line scan camera coupled with motorized X-Y stage is used. In order to measure the entire film area using several scanning steps, an overlapping method is used.

• Journal of Embryo Transfer
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• v.20 no.2
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• pp.169-176
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• 2005

Loop-mediated isothermal amplification (LAMP) is novel DNA amplification methods that amplifies a target sequence specifically under isothemal condition. The present study was to assess the in vitro viability afier biopsy and sexing rate of different types of embryo biopsied. In vivo compact morulae and blastocyst embryos were obtained from Korean Native Cow (KNC) superovulated with FSH (Antorin, R-10) on 7 Day after artificial insemination. in vitro compact morulae and blastocyst embryos were obtained with KNC or Holsteins that were gained on 6, 7 or 8 day after in vitro fertilization(IVF) with frozen semen. Biopsy of bovine embryo was carried out in a $80{\mu}l$ drop with $Ca^{2+}-Mg^{2+}$ free D-PBS and the viability of biopsied embryos were evaluated in IVMD (IFP, Japan) medium at 12 hrs culture time. The sex ratio of biopsied Hanwoo embryos were male vs. female of $43.5\%\;vs.\;56.5\%$ in vivo and $33.9\%\;vs.\;49.2\%$ in vitro respectively, and male rate of biopsied Holstein embryos were significantly higher than female $(70.8\;vs.\;29.2\%)$. and indefinite rate of in vitro embryos was $16.9\%$ and in vivo was not. The degeneration rate of biopsied embryo, in vitro embryos were significantly higher than in vivo $(13.2\%\;vs,\;0.0\%,\;p<0.05)$. The survivability of in vivo embryo were between biopsied following punching method was significantly (P<0.05) higher than bisection method produced embryos $(100\%\;vs.\;83.3\%)$ and in vitro had no difference. However, the degeneration rate of biopsied embryo by bisection method was significantly higher than punching methods between in vivo and in vitro $(16.7\;vs.\;22.6\%,\;respectively,\;p<0.05)$. In conclusion, these results indicate that punching method was optimal and survivability after embryo biopsy was useful for reducing the damage caused by the embryo biopsy procedure for LAMP-based embryo sexing.

• Proceedings of the Korean Society for Technology of Plasticity Conference
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• 2004.10a
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• pp.19-22
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• 2004

Shearing including punching, blanking, trimming, slitting, etc is one of the most frequently used processes in sheet metal manufacturing. It has been widely using for manufacturing autobody, electronic components, aircraftbody, etc. In this paper, it has been researched by the experimental investigation to examine the influence of shearing processes parameters such as clearance, cutting angle, material properties, etc. From the results of experiment, it has shown that it gives the small variations at burr height below the proper clearance and it also presents that it is no affected the variations of cutting angle.

• Proceedings of the KAIS Fall Conference
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• 2005.05a
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• pp.191-193
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• 2005

In this paper new, inverter control system for TG feedback a formula Control was developed. The motor control system with TG feedback controller as an effect of load disturbance, it is very difficult to guarantee the robustness of control system. The function of the implementation we TG feedback type, and temperature scheme. The Inverter Control System approach is based on master-slave control concept. To show validity of the developed new inverter control system, several experiments are illustrated.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.9 no.3
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• pp.628-631
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• 2008

A company needs to maintain its machines always workable in order to keep the manufacturing time minimal. If any troubles occur, they should be fixed as soon as possible. But, the complexity of modern machines make the trouble shooting difficult. So, it is important that the monitoring system for automated production system to fix every trobule easily. In this paper new, inverter control system for TG feedback a formula Control was developed. The motor control system with TG feedback controller as an effect of load disturbance, it is very difficult to guarantee the robustness of control system. The function of the implementation are 7G feedback type, and temperature scheme. The Inverter Control System approach is based on master-slave control concept. To show validity of the developed new inverter control system, severial experiments are illustrated.