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송명준,박영호,유석준,심동현,Song, Myung-Jun,Park, Yung-Ho,Yoo, Seok-Jun,Sim, Dong-Hyun (사)한국토질및기초기술사회 2006 기술발표회 Vol.2006 No.-
The project comprised the construction of the new oil pier and associated topside facilities and demolition of exiting south pier. The site is located approximately 33km south of Kuwait city at MAA refinery. The approach trestle and berth structures of the new oil pier were designed to be supported by steel tubular piles Total 2,480 numbers of piles(795 piles at Approach Trestle, 1187 piles at Berth 1 -4 and 498 piles at Berth 5-6) had to be driven through the calcareous silty sand In this study, the design procedures for offshore steel pipe piles, evaluation for the compression and tension capacities by static and dynamic load test and effective driving criteria by the final set values are discussed
n-표면 거칠기가 형성된 AlGaInP 수직형 적색 발광다이오드의 광추출효율 증가
서재원,오화섭,송현돈,박경욱,유성욱,박영호,박해성,곽준섭,Seo, Jae-Won,Oh, Hwa-Sub,Song, Hyun-Don,Park, Kyung-Wook,Ryu, Seong-Wook,Park, Yung-Ho,Park, Hae-Sung,Kwak, Joon-Seop 한국진공학회 2008 Applied Science and Convergence Technology Vol.17 No.4
AlGaInP 기반 수직형 적색 LED (Light Emitting Diode)의 광추출효율을 증가시키기 위하여 화학적 etching 기술을 이용하여 n-AlGaInP 표면에 삼각꼴 모양의 거칠기를 형성하였다. Etching은 $H_3PO_4$계의 용액을 이용하여 화학적 etching을 진행 하였다. AlGaInP etching은 광추출효율의 증가와 밀접한 관련을 갖고 있으며 AFM (Atomic Force Microscope)을 이용하여 AlGaInP 표면을 분석하여 약 44 nm의 RMS (root-mean-square) 거칠기가 형성됨을 알 수 있었다. 광추출효율은 기존 수직형 적색 LED보다 거칠기가 형성된 수직형 적색 LED에서 41%의 높은 발광 효율을 보임으로써 고효율 수직형 적색 LED의 가능성을 보였다. In order to increase extraction efficiency of AlGaInP-based vertical RED LEDs, chemical wet etching technique was produced by using a roughened surface with triangle-like morphology. A commonly used $H_3PO_4$-based solution was applied for chemical wet etching. The light extraction of AlGaInP LED was related to the n-side roughed surface morphology. The morphology of roughed surface is analyzed by the atomic force microscope (AFM). As a result, the roughed surface AlGaInP LED has a root-mean-square (RMS) roughness of 44 nm. The brightness shows 41% increase after roughening n-side surface, as compared to the ordinary flat surface LED.
저전력 장비에 적합한 효율적인 RSA 기반의 PAKE 프로토콜
이세원(Se Won Lee),윤택영(Taek-Young Youn),박영호(Yung Ho Park),홍석희(Seokhie Hong) 한국정보보호학회 2009 정보보호학회논문지 Vol.19 No.6
패스워드 기반의 키 교환(PAKE) 프로토콜은 난수를 공유하거나 PKI가 구축되어 있지 않은 환경에서 공유한 패스워드를 사용하여 세션키를 공유할 수 있게 함으로써 안전한 통신을 제공하는 암호학적 도구이다. RSA를 사용하여 효율적으로 설계하는 것이 쉽지 않기 때문에 대다수의 PAKE 프로토콜들은 Diffie-Hellman 키 교환을 기반으로 설계되어 왔다. 본 논문에서는 RSA 암호화의 효율성을 활용하여 비대칭 통신환경에 적합한 효율적인 RSA-PAKE 프로토콜을 제안한다. 제안하는 RSA-PAKE 프로토콜이 이론적인 계산량과 파라메타를 바탕으로 한 실험을 통하여 얼마나 효율적인지 판단한다. 제안하는 RSA-PAKE 프로토콜에서 비대칭 통신환경의 저전력 장비는 계산적으로 기존 프로토콜 중에서 안전하고 가장 효율적인 CEKEP보다 약 84% 효율적인 비용으로 키 교환을 수행할 수 있다. 특히, 일정 부분의 연산을 키 교환 과정이 진행되기 이전에 수행함으로써 키 교환 과정의 효율성을 극대화 할 수 있다. 제안하는 RSA-PAKE 프로토콜의 안전성은 RSA 문제를 기반으로 렌덤 오라클 모델에서 증명한다. Password-Authenticated Key Exchange (PAKE) Protocol is a useful tool for secure communication conducted over open networks without sharing a common secret key or assuming the existence of the public key infrastructure (PKI). It seems difficult to design efficient PAKE protocols using RSA, and thus many PAKE protocols are designed based on the Diffie-Hellman key exchange (DH-PAKE). Therefore it is important to design an efficient PAKE based on RSA function since the function is suitable for designing a PAKE protocol for imbalanced communication environment. In this paper, we propose a computationally-efficient key exchange protocol based on the RSA function that is suitable for low-power devices in imbalanced environment. Our protocol is more efficient than previous RSA-PAKE protocols, required theoretical computation and experiment time in the same environment. Our protocol can provide that it is more 84% efficiency key exchange than secure and the most efficient RSA-PAKE protocol CEPEK. We can improve the performance of our protocol by computing some costly operations in offline step. We prove the security of our protocol under firmly formalized security model in the random oracle model.
타원곡선암호시스템에서 Montgomery ladder 방법에 기반한 새로운 스칼라 곱셈 알고리즘
조성민(Sung Min Cho),서석충(Seog Chung Seo),김태현(Tae Hyun Kim),박영호(Yung Ho Park),홍석희(Seokhie Hong) 한국정보보호학회 2009 정보보호학회논문지 Vol.19 No.4
본 논문에서는 Montgomery ladder 방법을 확장한 효율적인 스칼라 곱셈 알고리즘을 제안한다. 제안하는 방법은 효율성을 높이기 위하여 스칼라를 ternary 또는 quaternary로 표현하고 아핀좌표계에서 Montgomery ladder 방법과 같이 x 좌표만을 이용하여 연산 가능하도록 하는 새로운 연산식을 적용한다. 그리고 단순전력분석에 안전하도록 Side-channel atomicity를 적용하였다. 또한 Montgomery trick을 사용하여 연산속도를 높였다. 제안하는 방법은 기존에 효율적으로 알려진 window method, comb method에 비해서 연산속도가 26% 이상 향상된다. 또한 이 방법들보다 저장공간을 적게 사용하는 장점도 가지고 있다. This paper proposes efficient scalar multiplication algorithms based on Montgomery ladder method. The proposed algorithm represents the scalar as ternary or quaternary and applies new composite formulas utilizing only x coordinate on affine coordinate system in order to improve performance. Furthermore, side-channel atomicity mechanism is applied on the proposed composite formulas to prevent simple power analysis. The proposed methods saves at least 26% of running time with the reduced number of storage compared with existing algorithms such as window-based methods and comb-based methods.
담낭신티그라피에 의한 담낭담석증 및 간흡충증 환자의 담낭운동성 분석
정판준(Pan Jun Chung),심대석(Dae Seok Shim),강재황(Jae Hwang Kang),류경렬(Gyeong Yeul Reu),원용환(Yong Hwan Won),박영호(Yung Ho Park),손미정(Mi Jung Son),정순일(Soon Il Chung),이옥재(Ok Jae Lee),김영채(Young Chai Kim) 대한내과학회 1995 대한내과학회지 Vol.48 No.1
N/A Objectives: Abnormal gallbladder motility and bile stasis have been implicated in the pathogenesis of gallstone and bacterial infection, but the cause-and-effect relationship is not established. Among the various methods used to measure the gallbladder motility, cholescintigraphy using 99 mTc-labelled iminoacetic acid is nowadays used widely, which is noninvasive, convenient, and is capable of quantitative analysis of gallbladder motility. To evaluate the gallbladder motility in patients with gallstones and clonorchiasis, the authors analyzed the gallbladder filling and emptying using computer-assisted cholescintigraphy. Methods: The study group comprised 30 patients who were admitted to GNUH, from 1992, October to 1993, August, 20 patients of them had asymptomatic gallbladder stones or clonorchiasis, 10 patients were controls. All patients were studied with abdominal ultrasonography and DISIDA cholescintigraphy. We measured maximum gallbladder filling time, half time of emptying and ejection fraction after ingestion of fatty meal. Results: 1) There was no significant difference in maximum gallbladder filling time between control (52.3±9.3 min) and patients with gallbladder stones (51.5±15.8 min) and patients with clonorchiasis (56.9±10.5 min). 2) Gallbladder emptying time (T1/2) were significantly delayed in patients with gallbladder stones (48.4±16.3 min) and clonorchiasis (40.8±12.9 min), as compared with control (23.0±7.5 min). Conclusion: The gallbladder emptying time using computer-assisted cholescintigraphy in patients with gallbladder stones and with clonorchiasis were significantly delayed, as compared with control.