• Proceedings of the Korean Society of Precision Engineering Conference
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• 2010.05a
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• pp.387-388
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• 2010

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2008.06a
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• pp.543-544
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• 2008

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2009.10a
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• pp.479-480
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• 2009

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2011.06a
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• pp.473-474
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• 2011

• Korean Journal of Optics and Photonics
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• v.14 no.4
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• pp.399-405
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• 2003

We manufactured a clamp-type optical current transformer (COCT) head using FD10 glass. It was manufactured of two parts of FD10 glass with symmetrical structure and was designed so that light propagates along the critical angle in order to avoid a phase difference with the light within the sensor head at reflection. Also, we measured and analyzed the current of conductor from 0 to 1,000 AT, change of optical power with incidence angle of light, temperature and polarization of light, long-term current measurement using COCT head, and demonstrated the feasibility of manufactured COCT through those experiments.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2005.06a
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• pp.1626-1629
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• 2005

Recently many countries have concentrated their effort on the port automation, in order to be the Hub-port, that the Ultra Large Container Ship could come alongside the Quay, in their region. As the magnitude of the container ship increase, that of the Quay crane increases from 50ton-class to 61ton-class more and more. The wind speed criteria to design the structures used in the port was upgraded from 20m/s to 40m/s due to change of the weather condition. Our laboratory could have the ability to design the wedge type rail clamp for 50ton-class Quay crane in 30m/s wind speed. Accordingly we analyzed the load condition of the Quay crane about 40m/s wind speed upgraded from 20m/s and designed the wedge type rail clamp for 50ton and 61ton-class Quay crane.

• Journal of Energy Engineering
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• v.12 no.1
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• pp.23-28
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• 2003

In this paper, in-air and in-water vibration characteristics of Rotary Specimen Rack (RSR) are estimated through 3D finite element modeling by using ANSYS software. Added mass is calculated by using Blevins' equation. To confirm the reasonability of the results presented in this study, obtained results are compared to those of using a theoretical equation. It is confirmed that in-water natural frequencies of the RSR are lower than in-air ones due to the added mass effect of the fluid. Also, to design clamp which needs to fix RSR, Von-Mises stress and displacement of RSR to clamp pressure are calculated.

• The Transactions of the Korean Institute of Power Electronics
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• v.16 no.2
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• pp.105-113
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• 2011

In this paper, photovoltaic module integrated converter (MIC) based on active clamp current-fed half-bridge converter is proposed. The converter stage operates in zero-voltage condition using active clamp technique. The theoretical study and circuit design for proposed inverter are confirmed with PSIM simulator and experimental reusult.

• Proceedings of the KIPE Conference
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• 2011.07a
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• pp.159-161
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• 2011

본 논문에서는 높은 승압비를 갖는 전압 클램프 탭인덕터 부스트 컨버터를 제안한다. 기존의 탭인덕터 부스트 컨버터 방식은 높은 승압비를 얻기 위해 사용되었던 탭인덕터로 인하여 일반적인 부스트 컨버터에 비해 주스위치와 다이오드의 전압스트레스가 크다는 단점이 있다. 또한, 누설 인덕터 성분과 기생 캐패시터로 인해 발생하는 공진 전압을 없애기 위해 손실스너버를 사용함으로 전력변환효율이 떨어지는 단점을 갖는다. 반면, 제안된 방식은 손실 스너버 없이 전압 클램핑 캐패시터를 사용하고 있다. 이 캐패시터는 기존의 탭인덕터 부스트컨버터의 주스위치 및 다이오드의 전압 스트레스를 줄이는 기능을 제공하게 된다. 본 논문에서는 제안된 부스트 컨버터의 동작원리를 이론적으로 해석하고, 모의실험을 통해 제안된 회로의 타당성을 검증하였다.

• Journal of the Korean Society for Precision Engineering
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• v.23 no.12 s.189
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• pp.103-110
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• 2006

The rail clamp is very important device to prevent that a container crane slips along a rail due to the wind blast as well as to locate the crane in the set position during an operating mode. Recently, the design wind speed criteria were intensified from the wind speed of 16m/s to 35m/s during an operating mode, and from 50m/s to 75m/s during a stowed mode in Korea, according to the 'Inspection Criteria for Facilities and Equipments in Port' reformed after typhoon 'Maemi'. In order to design the wedge type rail clamp for the reinforced design wind speed criteria of 35m/s, we carried out the finite element analysis of the rail clamp with respect to the wedge angle, and analyzed the relationship between the wedge angle and the sliding distance of the rail clamp.