• Proceedings of the KIEE Conference
• /
• 2008.11a
• /
• pp.279-281
• /
• 2008

현재 서부아프리카 지역의 경우, 대부분의 발전원은 수력과 화력에 의존하고 있으며 서부 아프리카경제공동체(ECOWAS) 15개 회원국의 전력수급률은 매우 낮은 수준일 뿐만 아니라 국가별 에너지 불균형 또한 심한 상태이다. 이에 서부 아프리카 전력공동체(WAPP)는 지역 간 에너지 불균형 해소 및 국가 간 전력망 연계를 위한 전력거래센터(ICC)의 구축을 추진하고 있다. 본 논문은 향후 WAPP ICC에서 본격적인 전력거래기능을 수행하기에 앞서 각 지역제어센터(CAC)의 전력 정보 수집, 분석 및 공유를 위한 자료연계 방안에 대해 서술하였으며 센터간의 자료연계를 위한 통신 프로토콜은 IEC 60870-6(ICCP) 프로토콜을 이용하였다.

• Proceedings of the Korea Information Processing Society Conference
• /
• 2017.04a
• /
• pp.373-375
• /
• 2017

Side-channel attacks and in particular differential power analysis (DPA) attacks pose a serious threat to cryptographic implementations. One approach to counteract such attacks is cryptographic schemes based on fresh re-keying. In settings of pre-shared secret keys, such schemes render DPA attacks infeasible by deriving session keys and by ensuring that the attacker cannot collect side-channel leakage on the session key during cryptographic operations with different inputs. This paper present a study on rekeying approach against side channel attacks with current secure schemes and their rekeying functions.

• Proceedings of the KIPE Conference
• /
• 2017.11a
• /
• pp.63-64
• /
• 2017

This paper proposes a speed estimator for sensorless control of diesel-generator (genset) systems, where the speed of the genset is calculated from the back-EMF frequency of the generator. The back-EMF frequency is extracted from a phase output current by using multiple second-order generalized integrators (SOGIs) connected in parallel and series and separated frequency-locked loops. The proposed method (PS-SOGI-FLL) is able to estimate the fundamental frequency in the distorted output current with high accuracy and strong robustness. Simulation results are shown to verify the validity of the proposed method.

• Korean Journal of Pharmacognosy
• /
• v.34 no.2 s.133
• /
• pp.150-155
• /
• 2003

The nuclear factor of activated T cells (NFAT) protein induce transcription of cytokine genes required for T-cell activation, including the IL-2 gene. Activation of NFAT normally plays a significant role in inducing immune response. However, excessive activation provokes immunopathological reactions including autoimmunity, transplant rejection and inflammation. Thus, several natural products were screened on the inhibitory activity against the NFAT transcription factor. Among them, Euonymus sieboldiana showed strong inhibitory activity against the NFAT transcription factor without affecting cell viability.

• Journal of Electrical Engineering and Technology
• /
• v.3 no.3
• /
• pp.436-443
• /
• 2008

This paper presents a new method for building detection and reconstruction from aerial images. In our approach, we extract useful building location information from the generated disparity map to segment the interested objects and consequently reduce unnecessary line segments extracted in the low level feature extraction step. Hypothesis selection is carried out by using an undirected graph, in which close cycles represent complete rooftops hypotheses. We test the proposed method with the synthetic images generated from Avenches dataset of Ascona aerial images. The experiment result shows that the extracted 3D line segments of the reconstructed buildings have an average error of 1.69m and our method can be efficiently used for the task of building detection and reconstruction from aerial images.

• Archives of Pharmacal Research
• /
• v.28 no.6
• /
• pp.657-659
• /
• 2005

A new biflavonol glycoside named as solanoflavone (1) was isolated from aerial part of Solanum melongena. The chemical structure was elucidated as isorhamnetin-3-O-$\beta$-D-glucopyranoside-(4'$\to$O$\to$4"')-galangin-3"-O-$\to$-D-glucopyranoside on the basis of physicochemical and spectroscopic methods, including 2D NMR spectral techniques.

• YAKHAK HOEJI
• /
• v.46 no.1
• /
• pp.47-51
• /
• 2002

Although acebutolol (ABT) is almost completely absorbed in the gastrointestinal (Gl) tract, oral bioavailability of the drug is low due to extensive first-pass metabolism in the Gl tract and liver. In the present study, bioavailability and pharmacokinetics of ABT was studied in bile duct-bypassed rabbits after oral administration. For ABT the time to reach the plasma peak (T$_{max}$) and mean resident time (MRT) were increased by the treatment. For diacetolol (DAT), a metabolite of ABT area under the plasma concentration-time curve (AUC), T$_{max}$ and plasma half-life were increased by the treatment. These results indicate that oral bioavailability of ABT is associated with the enterohepatic recycling of bile juice components.nts.

• Archives of Pharmacal Research
• /
• v.27 no.8
• /
• pp.825-828
• /
• 2004

Two triterpenoids (1,4) and two triterpenoid glycosides (2,3) were isolated from the root of Acanthopanax koreanum (Araliaceae). Their structures were identified as impressic acid (1), acankoreoside A (2), 3-epi-betulinic acid 28-O-［(${\alpha}-L-rhamnopyranosyl(1{\rightarrow}4)-{\beta}-D-glucopyrano-syl(1{\rightarrow}6)]-{\beta}-D-glucopyranosyl]$ ester (3), and ursolic acid (4) by physicochemical and spectro-scopic methods. Of these compounds, impressic acid (1) exhibited a potent inhibitory activity against NFAT transcription factor ($IC_{50}:{\;}12.65{\;}{\mu\textrm{m}}$).

• Archives of Pharmacal Research
• /
• v.27 no.11
• /
• pp.1106-1108
• /
• 2004

A new benzofuran derivative, named gymnastone [5-hydroxy-6-acetyl-2-(2-propane-1,2,3-triol)-benzofuran (1)], was isolated from the aerial part of Gymnaster koraiensis, together with viscidone (2) by repeated column chromatography. The structures of both compounds were identified by physico-chemical and spectral analysis including COSY, HMQC, and HMBC experiments.

• Proceedings of the Polymer Society of Korea Conference
• /
• 2006.10a
• /
• pp.296-296
• /
• 2006

Highly temperature stable mesoporous materials have excellent properties and potential applications. Here we show a novel poly(vinyl)silazane-block-polystyrene diblock copolymer, which was synthesized by controlled/living free radical polymerization with reversible addition fragmentation chain transfer (RAFT) route. The obtained diblock copolymer occurs the phaseseparation on the nanoscale to form ordered nanostructure, which is converted to mesoprorous ceramic after heating at 800oC. This route demonstrates the preparation of highly temperature stable mesoporous silicon carbon nitrides (SiCN) ceramic film directed from highly cross-linking poly(vinyl)silazane blocks with high ceramic yield, which is different from previous pathway.