• Tribology and Lubricants
• /
• v.3 no.2
• /
• pp.72-80
• /
• 1987

A planocentric torque driver comprises a stationary internal gear with the teeth of a circular concave profile and an external gear of an epitrochoid curve. The contact mechanism of the teeth is examined and analyzed by means of computer simulation. Analyses of load variation on the tooth and strength of appliance is carried out. And the output device is examined. Finally, the design of a 59:1 reduction ratio torque driver is presented.

• Proceedings of the KIEE Conference
• /
• 1998.07d
• /
• pp.1321-1323
• /
• 1998

We investigated drain leakage current in GaAs power MESFET. The device we studied by 20 simulation has a $1000{\AA}$ thick AlGaAs buffer layer under n-GaAs active layer. The calculation shows that the leakage current through GaAs substrate is significantly reduced by the buffer layer.

• Proceedings of the IEEK Conference
• /
• 2000.11b
• /
• pp.148-151
• /
• 2000

In recent years, security is essential factor of our safe network community. Therefore, data encryption/ decryption technology is improving more and more. Elliptic Curve Cryptosystem proposed by N. Koblitz and V. Miller independently in 1985, require fewer bits lot the same security, there is a net reduction in cost, size, and time. In this paper, we design high speed underlying field arithmetic processor for elliptic curve cryptosystem. The targeting device is VIRTEX V1000FG680 and verified by Xilinx simulator.

• Journal of Advanced Marine Engineering and Technology
• /
• v.27 no.7
• /
• pp.826-831
• /
• 2003

The purpose of this study was to measure the surface tension of hard water through electro-magnetic field for investigating the effect of electro-magnetic water treatment. The maximum reduction of surface tension was 8% comparing to the no treatment case. When the flow velocity through the permanent magnetic device (PMD) was 6.3 m/s, sample of hard water had the minimum surface tension.

• Journal of the Korean Institute of Telematics and Electronics A
• /
• v.32A no.12
• /
• pp.159-165
• /
• 1995

A gate-recessed structure is introduced to SOI MOSFET's in order to increase the source-to-drain breakdown voltage. A significant increase in the breakdown voltage is observed compared with that of a planar single source/drain SOI MOSFET without inducing the appreciable reduction of the current drivability. We have analyzed the origin of the breakdown voltage improvement by the substrate current measurements and 2-D device simulations, and shown that the breakdown voltage improvement is caused by the reductions in the impact ionization rate and the parasitic bipolar current gain.

• 한국정보디스플레이학회:학술대회논문집
• /
• 2002.08a
• /
• pp.31-33
• /
• 2002

Si TFTs are applied not only to stacked SRAM but also to FPD. Improvement of device characteristic such as an enhancement of carrier mobility or a reduction of leakage current is studied intensively. The TFT technology is developing based on conventional Si LSI technology. By establishing a stable fabrication process on flexible substrate and high performance characteristic uniformly and reliably, TFT technology has a possibility to develop to SOP or other highly functional applications similar to or beyond the conventional Si LSI in the era of information and telecommunication.

• Proceedings of the KIEE Conference
• /
• 2006.10a
• /
• pp.95-96
• /
• 2006

ITO thin film is generally fabricated by various methods such as spray, CVD, evaporation, electron gun deposition, direct current electroplating, high frequency sputtering, and reactive DC sputtering. However, some problems such as peaks, bumps, large particles, and pin-holes on the surface of ITO thin film were reported, which caused the destruction of color quality, the reduction of device life time, and short-circuit. Chemical mechanical polishing (CMP) process is one of the suitable solutions which could solve the problems.

• Proceedings of the KSR Conference
• /
• 2000.05a
• /
• pp.188-194
• /
• 2000

This study is about fault detection and fault area detection of LV circuit in Cab Cubicle system which have control of train to keep safety in High Speed Train. LV circuit is operated with diagnosis system like safety system. In this paper, we suggest a design and an implementation method to detect fault or to detect fault area automatically about LV circuit. The implemented system is tested successfully after implementation of some function. We expect reduction to diagnosis area or repair time by fault area module

• Proceedings of the KSR Conference
• /
• 2005.11a
• /
• pp.1261-1267
• /
• 2005

At this paper Dynamic respones of bridges for the Korean high-speed railway are analyzed by a modal analysis. To control vibration of bridges, Tuned Mass Damper(TMD) that is passive type control device is used. Opimize and prove it. Newmark method is used for a numerical analysis. In case of vehicle is modeled for moving mass that considers the effects of the moving. Also this paper is assumped as the simple supported Bernoulli-Euler beam and considered two dimensional Interaction motion between vehicle and bridge.

• Proceedings of the Korea Contents Association Conference
• /
• 2018.05a
• /
• pp.275-276
• /
• 2018

교량형 인도교량에서 강우와 함께 유입되는 비점오염원을 초기에 감소시켜 하천에 방류시킴으로써 하천 수질오염을 저감시키기 위해 중규모 저감장치의 성능 실험을 실시하였다. 그 결과를 오염요소별로 분석하여 저감장치의 성능을 향상시켜 실무 현장에 활용하고자 한다. 실험 분석항목은 BOD, COD, T-N 등을 대상으로 일정 시간 간격동안의 비점오염원 저감 효과로 분석하였으며, 그 효율은 대체로 양호한 것으로 나타났다.