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다(多)출력 DC-DC 플라이백 컨버터용 변압기 설계방법 및 개발
박종연,강도형,Park, Jong Yeon,Kang, Do Hyung 강원대학교 산업기술연구소 2000 産業技術硏究 Vol.20 No.1
This paper gives a fundamental study of the design method of Flyback Transformer(FBT) in the Multioutput Flyback DC-DC Converter. We explained a winding strategy and Core selecting of the Flyback transformer to get the design guidelines for optimizing the performance of Flyback DC-DC Converter. The final goal of this paper is to obtain design rules of the Flyback transformer to minimize the leakage inductance for good quality of DC Souce.
RSA에 대한 향상된 등간격 선택 평문 전력 분석 방법
박종연(Jong-Yeon Park),최지선(Ji-Sun Choi),한동국(Dong-Guk Han),이옥연(Okyeon Yi) 대한전자공학회 2010 대한전자공학회 학술대회 Vol.2010 No.6
Several Side Channel Analysis (SCA) techniques on RSA-CRT have been published. Especially, Boer at al. proposed a novel power analysis attack against modular reduction step at RSA-CRT by using equidistant chosen message as input, called as ECMPA. Based on this analysis, an attacker can get the secret primes in RSA algorithm. In this paper, we show that ECMPA has different analysis pattern compared to the general Differential Power Analysis and Correlation Power analysis. Therefore, to make ECMPA be more practical analysis we propose an enhanced ECMPA which includes how to select the result of decision function and how the ghost keys work.
제한된 파형을 이용한 향상된 RSA-CRT 부채널 분석
박종연 ( Jong-yeon Park ),한동국 ( Dong-guk Han ),이옥연 ( Okyeon Yi ),최두호 ( Dooho Choi ) 한국정보처리학회 2011 한국정보처리학회 학술대회논문집 Vol.18 No.1
RSA-CRT 알고리즘은 RSA 의 지수승 연산의 효율성을 향상시키기 위해 널리 사용되고 있으며, CRT 를 적용한 알고리즘은 다양한 방법의 부채널 분석(Side Channel Analysis)으로부터 약점이 노출되어 왔다. 그 중 Boer 등에 의해 발표된 MRED 분석 방법은, 등 간격의 데이터(Equidistant Data)를 이용하여 CRT 의 모듈러 리덕션 연산(Modular Reduction)결과로부터의 약점을 활용하여 일반적인 DPA 분석 법을 적용시킨 방법이다. 우리는 리덕션 결과의 데이터에 의존한 분석에서 벗어나, 리덕션 알고리즘 중간 연산 과정을 공격하는 새로운 공격 방법을 개발하였으며, 새로운 공격은 오직 “256×n개”의 파형만으로 키 공간을 상당히 줄일 수 있기 때문에, 제한된 평문 수에서 이전에 알려져 있던 일반적인 MRED 분석 방법보다 향상된 분석 성능을 제공한다. 본 논문은 리더션 연산과정을 이용한 새로운 전력 분석 방법을 실제 MCU Chip 을 이용한 분석 결과를 제안한다.
Zn - 22wt%Al 합금의 진동감쇠특성에 미치는 냉간가공과 온도의 영향
김종연(Jong Yeon Kim),박희석(Hee Seok Park),나형용(Hyun Yong Ra) 대한금속재료학회(구 대한금속학회) 1996 대한금속·재료학회지 Vol.34 No.9
This study was conducted on the specific damping capacity(SDC) of rolled Zn-22Al alloy(Superplastic Zinc, SPZ). SDC is found to increase with increasing reduction ratio, because of the microstructure change from network to particle type. SDC is very sensitive to the change of frequency, so that the variation of frequency with reduction ratio was investigated. Frequency is almost constant with reduction ratio. But the frequency is decreased when the specimen is heat treated. SDC of both as-rolled and heat treated sheets are increased largely with increasing temperature. That is, SDC is about 11~14% at room temperature, but 50% at 130℃. This reason is considered as follows. Relaxation time τ subjects to thermal activation process and SDC becomes a maximum(has a peak) when ωτ is equals to 1 in SDC =△0ωτ/ (l +ω2τ2).
아프리카산 발톱개구리 이자의 초기발생과정에서 Sox9 억제가 Pdx1 발현에 미치는 영향
박병용(Byung Yong Park),이여광(Li Guang Li),최은혜(Eun-Hye Choi),정몽룡(Mong-Yong Jung),권기탁(Ki-Tak Kwon),정연호(Yeon-Ho Jeong),김종연(Jong-Youn Kim),김인식(In-Shik Kim),박병건(Byung Keon Park),이영훈(Young-Hoon Lee) 대한해부학회 2007 Anatomy & Cell Biology Vol.40 No.1
이자는 외분비샘과 내분비샘으로 구성되어 있고 신체의 항상성을 조절하는 기관이다. 발생과정 중에 이자는 앞창자 (foregut)의 등쪽과 배쪽에서 융기하여 형성되고 성장하여 하나의 기관으로 유합된다. 발생하는 이자에서 발현되는 초기 유전자의 역할을 확인하는 것은 기관의 형성과 분화를 이해하는데 매우 중요하다. 이자발생에 관여하는 유전자 중에서 Pdx1은 초기에 발현되고 이자발생에 중요하게 관여하는 것으로 알려져 있다. Sox 단백질은 다양한 발생과정을 조절하는 전사인자이고 그중 하나인 Sox9는 발생중인 이자에서 발현되지만 아직까지 그 역할은 잘 알려져 있지 않다. 본 연구에서는 Sox9의 hormone inducible inhibitory mutant를 이용하여 Sox9의 작용을 차단한 결과, 발생하는 아프리카산 발톱개구리의 이자싹(pancreatic bud)에서 Pdx1의 발현이 감소되는 것을 확인하였다. 이상의 결과로 Sox9는 아프리카산 발톱개구리 이자의 발생에 관여할 것으로 생각된다. The pancreas is a mixed exocrine and endocrine gland involved in the control of many homeostatic functions. During embryogenesis, the pancreas arises from dorsal and ventral evaginations of the foregut, which ubsequently fuse into a single organ. The characterization of early genes expressed in the developing pancreas is critical to understand its specification and differentiation. Pdx1 is one of the earliest markers of pancreatic development and a key molecule in its development. Sox proteins form a large class of transcriptional regulators implicated in the control of a variety of developmental processes. One member of this family, Sox9, is expressed in the developing pancreas, but little is known about the function of Sox9 in the developing pancreas. We further investigated Sox9 function during pancreatic development in Xenopus. Using a hormone-inducible inhibitory mutant of Sox9, we found that Pdx1 expression was reduced in the ventral pancreatic buds in Sox9-depleted embryos. We suggest that Sox9 gene expression may be involved in pancreatic development in Xenopus.
박상환(Sang-Hwan Park),윤성수(Sung-Su Yun),이동식(Dong-Shik Lee),김홍진(Hong-Jin Kim),최준혁(Joon-Hyuk Choi),김종연(Jong-Yeon Kim) 대한외과학회 2007 Annals of Surgical Treatment and Research(ASRT) Vol.73 No.1
Purpose: Liver cell damage after ischemia and reperfusion injury has been a major cause of death after liver surgery. Yet there have been no exact and practical guidelines for assessing liver cell damage after ischemia and reperfusion injury. The aim of this study was to estimate the liver cell viability after ischemia and reperfusion injury. Methods: A 70% partial liver occlusion model with employing Spraque Dawley Rats was used. The ATP content of the liver tissue, the palmitic acid metabolic rate and the histologic change (H/E, TUNEL stain) were all measured at 30 minute intervals to assess liver cell viability during 120 minutes of ischemia. At 24 hours reperfusion after 30, 60 and 120 minutes ischemia, the same parameters and the AST/ALT level in the blood were measured. Results: The ATP content was decreased below 20% compared to normal liver after ischemia, but there were no significant changes in the histology and the palmitic acid metabolic rate during 120 minutes ischemia. At 24 hours reperfusion after 30, 60 and 120 minutes ischemia, the ATP content was decreased to around 50% in all the groups and the palmitic acid metabolic rate was decreased 90.9±2.4%, 80.0±5.3% and 79.1±7.7%, respectively, compared to the control liver. But histologic change was not as great as the change in the ATP content and the palmitic acid metabolic rate. Conclusion: Judging by these results, liver has relatively good tolerance during ischemia, but after reperfusion, the liver showed damage depending on the duration of ischemia. This study might be very helpful as a guide line of liver damage after ischemia and reperfusion in both clinical practice and basic research.
박종연,최규현,Park, Jong-Yeon,Choe, Gyu-Hyeon 대한전자공학회 2000 電子工學會論文誌-TC (Telecommunications) Vol.37 No.4
통신을 위한 채널로써 전력선을 활용하기 위해서, 전력선상에서 존재하는 잡음을 측정하여 잡음 데이터를 획득하고, 망구조에 따른 단위길이(100m당)에 따른 신호 감쇄량을 측정했다. 본 논문에서 구분한 3종류의 전력선 구조에 따른 신호 감쇄와 잡음의 최대, 최소값을 이용해서 채널 용량식에 대입한 후 통신 채널로써 전력선이 가지는 채널용량을 계산하였다. 건물내 전력선이 가지는 채널용량은 전력선에 있어서 송,수신기 사이의 거리와 전력선 망구조에 영향을 크게 받는 것으로 나타났다. To use the power line as the communication channel, we have analyzed channel characteristics with the noise data and signal attenuation levels measured on power lines per loom. In this paper, channel capacities are calculated in the best or the worst case noise states and signal attenuations on power lines for three kinds of network-topologies. Analyzed the channel capacity by the best and worst conditions, we concluded that the serious factors influenceing on the channel capacity are the length from a transmitter to a receiver and the network topology.