• Proceedings of the Korean Society of Plant Pathology Conference
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• 2003.10a
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• pp.14-14
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• 2003

Potato virus X (PVX), the type member of Potexvirus genus, is a flexuous rod-shaped virus containing a single-stranded (＋) RNA. Infection by PVX produces genomic plus- and minus-strand RNAs and two major subgenomic RNAs (sgRNAs). To understand the mechanism for PVX replication, we are studying the cis- and/or trans-acting elements required for RNA replication. Previous studies have shown that the conserved sequences located upstream of two major sgRNAs, as well as elements in the 5' non-translated region (NTR) affect accumulation of genomic and sg RNAs. Complementarity between sequences at the 5' NTR and those located upstream of two major sgRNAs and the binding of host protein(s) to the 5' NTR have shown to be important for PVX RNA replication. The 5 NTR of PVX contains single-stranded AC-rich sequence and stem-loop structure. The potential role(s) of these cis-elements on virus replication, assembly, and their interaction with viral and host protein(s) during virus infection will be discussed based on the data obtained by in vitro binding, in vitro assembly, gel shift mobility assay, host gene expression profiling using various mutants at these regions.

• Transactions of the Korean Society of Pressure Vessels and Piping
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• v.5 no.1
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• pp.25-31
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• 2009

Steam Generator(SG) tube is an important component of Nuclear Power Plant(NPP), which comprises of the pressure boundary of primary system. The integrity of SG tube has been confirmed by the eddy current test every outage. In Korea, Bobbin probe and MRPC probe have been generally used for the eddy current test. Meanwhile the usage of Array probe has gradually increased in U.S., Japan and other countries. In this study, we investigated the defect detection capability of the Array probe through its preliminary application to SG tube inspection. The Array probe has the equivalent capability in the defect detection and sizing as the conventional methods. Thus it is desirable that the Array probe is generally applied to SG tube inspection in the domestic NPPs.

• Review of KIISC
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• v.26 no.4
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• pp.22-27
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• 2016

국제전기통신연합(ITU)은 UN 산하에 신설된 국제기구로써, 산하에 전기통신표준화부문(ITU-T), 전기통신개발부문(ITU-D), 그리고 전파통신 부문(ITU-R) 등 3개의 부문으로 구성되어 있다[1],[2]. ITU-T는 역할과 임무에 따라 11개의 연구반 (SG, study group)을 구성하고 있으며, 각 업무에 맞는 선두 그룹(Lead Study Group)을 지정하여 표준을 개발하고 있다. 이중 SG17(보안)은 전기통신 분야 정보보호 국제표준화를 담당하고 있다[2]. 본 논문에서는 ITU-T 내에 정보보호 국제표준화 활동에 대한 상위수준의 PP-14 결의(Resolution) 분석과 SG17 국제표준화 활동의 최신 동향 및 차기 연구회기(2017-2020) 구조조정 방향에 대해 살펴본다.

• Journal of the Korean Institute of Electrical and Electronic Material Engineers
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• v.17 no.1
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• pp.16-20
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• 2004

We present the fabrication and performance of wavelength tunable butt coupled (BT) sampled-grating (SG) distributed bragg reflector (DBR) - planar buried heterostructure (PBH) laser diodes (LD). The fabricated LD showed the high optical output power due to the high coupling efficiency between active and passive components by the BT coupling methods. The series resistance and diode ideality factor of LD were measured to be 3.7 $\Omega$ and 1.35, respectively. The average threshold current was 25 ㎃. The output powers of BT-SG DBR-PBH-LD were obtained to be as high as 12.3 and 24.56 ㎽ at 100 and 200 ㎃, respectively. The maximum wavelength tuning range was about 31 nm and the side mode suppression ratio was about 37 dB.

• Journal of the Korean Institute of Telematics and Electronics A
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• v.33A no.12
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• pp.1-8
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• 1996

In this paper, we propose a hybrid blind equalizer with TEA and SG (stop & Go) algorithm with switching point a 0 dB of MSE value for improvement of convergence performance, where TEA is used initially to open the eye and then SG algorithm as rapid convergence is employed. The switching point is selected at the point of 0 dB MSE level because of settling the coefficients of blind equalier. As a result of computer simulatons for 8-PAM in the non-minimum phase channel, the proposed algorithm has better convergence speed as 3,500 ~ 4,500 iterations and has better MsE about 3 ~ 6 dB than those of original TEA. Also, computational cost of proposed algorithm is reduced as 5 ~ 16% than that of original TEA. and, the proposed algorithm has better convergence than SG algorithm as 8,500 ~ 17,500 iteratins but, the MSE is similar to original SG.

• Journal of Ginseng Research
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• v.36 no.3
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• pp.270-276
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• 2012

The effect of orally administered sun ginseng (SG), which is a ginseng processed by steaming, was examined in adenine-induced chronic renal failure rat. SG significantly decreased both blood urea nitrogen and serum creatinine levels, indicating an improvement of renal function. Also, SG significantly increased the urinary excretion of both urea and creatinine. Furthermore it lowered the blood pressure, and inhibited adenine-induced kidney hypertrophy and edema. Based on these findings, SG may ameliorate chronic renal failures.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2003.10a
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• pp.920-923
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• 2003

Not only IETF but also ITU-T SG17 and ISO JTC1 SC6 are also concerning about Internal group communication in the Internet. The recent hot issues on group communications are ECTP, GMP and RMCP. In this paper we present the mechanism and the standardization status on ECTP, GMP and RMCP.

• Transactions of the Korean Society of Automotive Engineers
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• v.10 no.6
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• pp.227-233
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• 2002

A vehicle longitudinal control strategy with guaranteed string stability for vehicle stop-and-go(SG) cruise control is presented in this paper. The SG cruise control systems should be designed such that string stability can be guaranteed in addition to that every vehicle in a string of SG cruise control vehicles must track any bounded acceleration and velocity profile of its preceding vehicle with a bounded spacing and velocity error. An optimal vehicle following control law based on the information of the 1311owing distance (clearance) and its velocity relative to the vehicle ahead (relative velocity) has been used and string stability analysis has been done based on the control law and constant time gap spacing policy, A validated multi-vehicle simulation package has been shown that the string stability analysis using the approximate model of the vehicle servo-loop which includes vehicle powertrain and brake control system dynamics is valid in the design of the SG cruise control law with guaranteed string stability.

• Review of KIISC
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• v.18 no.4
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• pp.13-29
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• 2008

정보보호 분야의 국제표준화는 각 기술들의 특성 및 사용자들의 관점 등을 고려하여, 다양한 국제표준화기구에서 국제표준개발 및 관련 연구가 이루어지고 있다. 즉, ITU-T SG17에서는 전기통신(Telecommunication) 관점에서 정보보호 응용기술들에 대한 국제표준화가 추진되고 있으며, ISO/IEC JTC1/SC27(정보보호), SC37(바이오인식)에서는 정보보호 원천기술들에 대한 국제표준화가, IETF Security Area에서는 인터넷 서비스의 품질 보장 및 향상된 인터넷 환경 구축을 위해 실제적인 구현 관점에서의 보안기술 국제표준화를 추진하고 있다. 본 논문에서는 ITU-T SG17에서 추진되고 있는 정보보호 국제표준화 이슈를 중점적으로 다루고자 하며, 이번 연구회기(’05${\sim}$’08) 동안에 논의되었던 주요 표준화 추진 결과와 차기 연구회기(’09${\sim}$’12)를 준비하기 위한 구조조정 결과 및 향후 표준화 추진방향 등을 제시하여, 향후 국내에서 ITU-T SG17에 활동하고자 하는 전문가들에게 유용한 자료를 제공하고자 한다.

• Journal of Communications and Networks
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• v.18 no.3
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• pp.484-492
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• 2016

Smart grid (SG) technology is now elevating the conventional power grid system to one that functions more cooperatively, responsively, and economically. When applied in an SG the demand side management (DSM) technique can improve its reliability by dynamically changing electricity consumption or rescheduling it. In this paper, we propose a new SG scheduling scheme that uses the DSM technique. To achieve effective SG management, we adopt a mixed pricing strategy based on the Rubinstein-Stahl bargaining game and a repeated game model. The proposed game-based pricing strategy provides energy routing for effective energy sharing and allows consumers to make informed decisions regarding their power consumption. Our approach can encourage consumers to schedule their power consumption profiles independently while minimizing their payment and the peak-to-average ratio (PAR). Through a simulation study, it is demonstrated that the proposed scheme can obtain a better performance than other existing schemes in terms of power consumption, price, average payment, etc.