• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2008.05a
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• pp.734-737
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• 2008

This paper presents a new automatic TFT-LCD image quality optimization system. We also have developed new algorithms using 6-point programmable matching technique with reference gamma curve, and automatic power setting sequence. It optimizes automatically gamma adjustment and power setting registers in mobile TFT-LCD driver IC to reduce gamma correction error, adjusting time, and flicker. Developed algorithms and programs are generally applicable for most of the TFT-LCD modules. The proposed optimization system contains module-under-test (MUT, TFT-LCD module), control program, multimedia display tester for measuring luminance and flicker, and control board for interface between PC and TFT-LCD module. The control board is designed with DSP, and it supports various interfaces such as RGB and CPU. Developed automatic image quality optimization system showed significantly reduced gamma adjusting time, reduced flicker, and much less average gamma error than competing system. We believe that the proposed system is very useful to provide high image quality TFT-LCD and to reduce developing process time using optimized gamma-curve setting and automatic power setting.

• Proceedings of the Korea Society of Environmental Toocicology Conference
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• 2003.05a
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• pp.183-184
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• 2003

Sophoricoside was isolated as the inhibitor of IL-5 bioactivity from Sophora japonica (Leguminosae). It has been reported to have an anti-inflammatory effect on rat paw edema model. To develop as an anti-allergic drug, genotoxicity of sophoricoside was investigated in bacterial and mammalian cell system such as Ames bacterial test, chromosomal aberration assay, Comet assay and MOLY assay. In Ames test, sophoricoside of 5000 ∼ 313 $\mu\textrm{g}$/plate concentrations was not shown significant mutagenic effect in Salmonella typhimurium TA98, TA100, TA1535 and TA1537 strains. The cytotoxicity (IC$\_$50/ and IC$\_$20/) of sophoricoside was determined above the concentration of 5000 $\mu\textrm{g}$/ml in Chinese hamster lung (CHL) fibroblast cell and L5178Y mouse lymphoma cell line. At concentrations of 5000, 2500 and 1250 $\mu\textrm{g}$/ml, this compound was not induced chromosomal aberration in CHL fibroblast cell in the absence and presence of S-9 metabolic activation system. Also in comet assay, DNA damage was not observed in L5178Y cell line. Also in MOLY assay, sophoricoside of 5000 ∼ 313 $\mu\textrm{g}$/ml concentrations was not shown significant mutagenic effect in absence of S-9 metabolic activation system. However, the higher concentration of 5000 and 2500 $\mu\textrm{g}$/ml of sophoricoside induced the increased mutation frequency (MF) in the presence of S-9 metabolic activation system. From these results, no genotoxic effects of sophoricoside observed in bacterial systems whereas, genotoxic effects observed in mammalian cell systems in the presence of metabolic activation system. These results suggested that the metabolite(s) of sophoricoside can cause some genotoxic effects in mammalian cells.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.29 no.12
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• pp.68-76
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• 2015

We examine the standalone lightning warning system (LWS) and its warning performances for three years. This system acquires and analyzes the data of cloud-to-ground strike (CG), intra-cloud discharge (IC) and electrostatic field (EF) to produce prior warnings with respect to the impending arrival of CG in the area of concern (AOC). The warnings in this system are carried out based on the fixed two areas method. To evaluate warning performances, we analyzed the statistics of warnings with probability of detection (POD) and false alarm ratio (FAR). Based on the previous study, we revised the trigger and clear conditions of lightning warning for improving the performances of the system. As a result of this revision, POD increased from 0.18 to 0.44 and FAR decreased from 0.96 to 0.78 during the summer of 2014. However, the LWS was not possible to trigger effective alerts (EA) because there was no effective lead time (LT) for the fixed two areas method. Problems related to the low detection efficiency of IC and the use of EF data for warnings still decreased POD and increased FAR. Hence, we proposed the development method of a new LWS (NLWS) that would be composed of integrated weather data, the flexible two areas and the user software in order to trigger EA and improve warning performances.

• Journal of the Korea Computer Industry Society
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• v.3 no.3
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• pp.369-382
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• 2002

The increase of vehicles stagnations leads to the increasing attention to the way customers pay and a large number of Projects on electronic cash system. Tranport system is comprised of a number of advanced technologies, including information processing, communications, control, and electronics. Recently many research on a system which provides contact in order to protect driver's vehicle passage have been carried out. And some potential problems from that system are being reviewed by electronic cash system. In this papers, we suggest RF protocol developing technology using the concept of electronic cash. ATM electronic cash developing is consist of component of pre-developed coin throw, integration of component using its, and production of more requirement-satisfactory ITS solution. Result increase 15-40% pre-type vehicles stagnations. Especially, we expect this proposed concept would be well adapted to our national environments.

• Proceedings of the IEEK Conference
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• 2003.07c
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• pp.2681-2684
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• 2003

본 연구에서는 전파천문학에 있어서 스펙트로그램을 얻기 위한 장치인 필터뱅크의 고속 데이터 취득에 관한것이다. 여기서는 FPGA를 기반으로 데이터 취득시스템을 설계하였는데, 기존의 모노리틱 IC 를 기반으로 설계된 데이터 I/O 를 FPGA 로 대체함으로써 부피를 적게하고 데이터의 고속처리를 가능하게 하였다. 우주현상을 관측함에 있어 고속으로 데이터를 처리함은 대기중의 불안정한 상태나 시스템의 불안정에 의한 좋지 않은 데이터를 정확히 선택하여 제거할 수 있는 데이터 시간 분활이 가능하게 한다. 본 논문에서 개발된 시스템을 적용하여 기존 시스템에 비하여 약 15 배 정도의 고속 데이터 처리가 가능하게 되었다.

• 제어로봇시스템학회:학술대회논문집
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• 1989.10a
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• pp.317-321
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• 1989

The FIC(Flat Integrated Circuits)is widely used for good productivity but very difficult for visual identification. The required position tolerance is 0.05mm and orientation tolerance is 0.25 degree for assembly. The research was performed to detect FIC defects and to estimate the placement of FIC within the tolerances. In this study an automatic visual system is developed, which can successfully perform a fine assembly operation using the cartesian robot.

• 전기의세계
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• v.30 no.1
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• pp.55-63
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• 1981

This paper deals with the drive contrl of common elevator systems which may be realized with .mu.p-controlled selective-collective elevator systems. Incorporation on non-contact point circuits instead of electromagnetic relays in such an elevator system results in miniaturization of complicated hardware controllers currently being used. The drive control method is implemented by software programming. The important features are not only technical advantages such as higher performance, high speed data processing and more improved reliability, but also lower cost as compared with the conventional elevator drive control units equipped with a number of sequential electromagnetic relays and even more recent static IC logic circuits.

• Proceedings of the Computational Structural Engineering Institute Conference
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• 1992.10a
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• pp.121-126
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• 1992

This Paper presents a development of a CAD system for interactive design of steel frames. The adopted building code for structural design is "Steel Building Codes" enacted by the Architectural Institute of Korea in 1973. The selected member sections, therefore, are domestic rolled sections - especially, H shapes. The authors aim at a development of an integrated computer programs repeating plane frame analysis and design of members until minimum weight design condition is satisfied. This program also provides various section change functions to improve the shortcomings of automatic design.ic design.

• Proceedings of the Korea Database Society Conference
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• 1995.12a
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• pp.3-19
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• 1995

시스템 Technology ★ Server Technology - 운영환경구축 ★ Network 구성설계 - ATM, FDDI, NMS ★ Client/Server시스템 구성별 Bench Marking ★ Windows 메뉴 및 GUI 설계 ★다기능 PC 운영환경 설정 시스템 Technology ★ Data Base Technology - DB Administration - BB Performance Tuning ★ System Integration Technology - Application Integration - System Flow Control - Task Control - Applicational Interface - S/W Down Load 시스템 Technology ★ Memory Optimization ★ IBM/Facom Host API ★ 영상전화 Customizing - Intel Proshare ★ Auto Dialing - CTI Link ★ IC-Card Interface 시스템 Technology ★ Sound 처리 - Voice Mail - 음절 처리 ★ Image 처리 ★도움말 처리 - Hyper Text 시스템 Technology ★ Socket Programming - 긴급메일 - Peer to peer message switching ★ Set Up Programming -Install Shield ★ DB Access Programming - DB-Library ★ TCP/IP Programming(중략)

• Proceedings of the IEEK Conference
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• 2001.06e
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• pp.5-8
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• 2001

In this paper, we have space vector PWM(Pulse Width Modulation) circuits on the FPGA(Field Programmable Gate Arry) chip designed by VHDL(Very high speed integrated circuit Hardware Description Language). This circuit parts was required at controlling the AC servo motor system and should have been designed with many discrete digital logics. In the result of this study, peripheral circuits are to be simple and the designed logic terms are robust and precise. Because of it's easy verification and implementation, we could deduced that the customize FPGA chip show better performance than that of circuit modules parts constituted of discrete IC.