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Secure and Efficient Protocol for Vehicular Ad Hoc Network with Privacy Preservation
Choi, Hyoung-Kee,Kim, In-Hwan,Yoo, Jae-Chern Hindawi Publishing Corporation 2011 Eurasip Journal on Wireless Communications and Net Vol.2011 No.-
<P>Security is a fundamental issue for promising applications in a VANET. Designing a secure protocol for a VANET that accommodates efficiency, privacy, and traceability is difficult because of the contradictions between these qualities. In this paper, we present a secure yet efficient protocol for a VANET that satisfies these security requirements. Although much research has attempted to address similar issues, we contend that our proposed protocol outperforms other proposals that have been advanced. This claim is based on observations that show that the proposed protocol has such strengths as light computational load, efficient storage management, and dependability.</P>
개선된 위임 서명 방식을 이용해서 더 안전한 펨토셀 환경 구축
최형기(Hyoung-Kee Choi),한찬규(Chan-Kyu Han),김승룡(Seung-Ryong Kim) 한국정보보호학회 2014 정보보호학회논문지 Vol.24 No.1
공공 장소에서 끊김없이 통신할 수 있도록 하기 위하여 펨토셀에 대한 요구가 엄청나게 증가하고 있다. 3GPP(3rd Generation Partnership Project)에서 새로 발표한 “Release 9”에서 Home eNode B는 HeNB(Home evolved Node B)로 언급된 펨토셀을 처리하기 위한 새로운 구조와 보안 요구사항을 정의했다. 따라서 본 논문에서는 HeNB의 보안에 대한 상호 인증, 접근 제어 및 안전한 키 동의 과정을 분석한다. 본 논문의 분석을 통하여 3GPP 기술 규격에 의해 정의된 보안 취약점 중에서 언급되지 않았거나 아직도 해결되지 않고 있는 보안 취약점들에 대해 설명한다. 이러한 보안 취약점으로는 도청, 중간자 공격, 가입자 접근 목록 손상, 그리고 유효한 HeNB로의 위장 등이 있다. 이 논문의 후반부에서는 HeNB에 대해 위임 서명된 위임 서명을 적용한 개선된 인증과 키 동의 메커니즘을 제안한다. 분석 결과 제안된 방법은 다양한 보안에 대한 위협을 막을 뿐만 아니라 사용자가 허용할 수 있는 범위의 최소 인증 지연 시간을 갖음을 알 수 있었다. Demand for the femtocell is largely credited to the surge in a more always best connected communication conscious public. 3GPP defines new architecture and security requirement for Release 9 to deal with femtocell, Home eNode B referred as HeNB. In this paper, we analyze the HeNB security with respect to mutual authentication, access control, and secure key agreement. Our analysis pointed out that a number of security vulnerabilities have still not been addressed and solved by 3GPP technical specification. These include eavesdropping, man-in-the-middle attack, compromising subscriber access list, and masquerading as valid HeNB. To the best of our knowledge, any related research studying HeNB security was not published before. Towards this end, this paper proposes an improved authentication and key agreement mechanism for HeNB which adopts proxy-signature and proxy-signed proxy-signature. Through our elaborate analysis, we conclude that the proposed not only prevents the various security threats but also accomplishes minimum distance from use-tolerable authentication delay.
Neonatal Severe Anemia Due to Massive Fetomaternal Hemorrhage
( Hyoung Cheul Park ),( Sang Kee Park ),( Min Seon Choi ) 대한주산의학회 2019 Perinatology Vol.30 No.1
Fetomaternal hemorrhage refers to the entry of fetal blood into the maternal circulation before or during delivery. Very small amount of fetal red cells are normally detectable in all pregnancies. Massive fetomaternal bleeding is very rare and even rarer is the resultant severe anemia causing early neonatal death. Especially, the bleeding occurs more than 150 mL from the fetus to the mother, defined as a massive bleeding, even though it is very rare, is known to account for more than 10% of unexplainable deaths of fetuses. Fetal blood is likely to enter the maternal circulation during all pregnancies, without apparent clinical significance in most cases. Decreased or absence of fetal movement is the most common antenatal presentation, observed in approximately 25% of all cases. We hereby report that a severe anemia and dyspnea from a newborn baby was found and that it was treated instantly right after the birth. It was a case of the massive fetomaternal hemorrhage of more than 300 mL.
Choi, Hyoung-Gyu,Kee, Chul-Sik,Park, Hae Yong,Kim, Jae-Eun Institute of Physics Publishing in association wit 2009 Journal of optics A, Pure and applied optics Vol.11 No.12
<P>We have numerically investigated supercontinuum generation in photonic crystal fibers with zero-dispersion wavelengths in the vicinity of 800 nm by using an input pulse with a peak power of about 20 kW and a width of about 10 fs. The effects of fiber dispersion and the input pulse parameters on the generated optical spectra are quantitatively analyzed. The propagation length necessary for the generation of a soliton in the anomalous dispersion region is found to depend on the zero-dispersion wavelength of a fiber. For the generation of a sufficiently broad spectrum, the photonic crystal fiber should be longer than the soliton-generation length. In addition, a spectral recoil effect appears when a solitary wave splits the dispersive wave into two parts.</P>
Choi, Ihn-Geun,Son, Hyun-Gyun,Yang, Byung-Hwan,Kim, Seok Hyeon,Lee, Jun-Suk,Chai, Young-Gyu,Son, Bong Ki,Kee, Baik Seok,Park, Byung Lae,Kim, Lyoung Hyo,Choi, Yoo Hyun,Shin, Hyoung Doo Wiley Subscription Services, Inc., A Wiley Company 2005 Human mutation Vol.26 No.3
<P>Alcoholism is a multifactorial and polygenic disorder involving complex gene-to-gene and gene-to-environment interactions. Alcohol metabolism is one of the biological determinants that could significantly be influenced by genetic polymorphisms in alcohol-metabolism genes. These genetic polymorphisms are believed to influence drinking behavior and development of alcoholism. Direct DNA sequencing of whole ADH1B and ADH1C genes revealed 36 sequence variants, including six nonsynonymous and 14 novel polymorphisms. Seventeen polymorphisms among them were selected for genotyping in a larger study (n=352) based on linkage disequilibria (LDs) among SNPs, locations, and frequencies. Hardy-Weinberg equilibrium (HWE) analyses of polymorphisms revealed severe deviations only in alcoholics, which strongly suggest that a selection bias (or pressure) may be involved. The analyses of genotype distribution in alcoholics (n=106) and normal controls (n=246) showed dramatic associations with the risk of alcoholism. Fourteen polymorphisms in ADH1C and ADH1B showed a series of different strengths of association and magnitudes of risk. Based on referent and subgroup analysis, it was strongly suggested that the genetic effects come from the ADH1B*47Arg/*47Arg genotype, and that the positive signals from other sites are just tracking the genetic effect of ADH1B His47Arg. In this article we present summaries of previous studies and of the present study, to give an overview of the worldwide effects of ADH1B His47Arg on the risk of alcoholism. The information derived from this study could be valuable for understanding the genetic factors involved in the risk of alcoholism and facilitate further investigation in other ethnic groups. Hum Mutat 26(3), 224–234, 2005. © 2005 Wiley-Liss, Inc.</P>
최재진,박정대,김유홍,황기석,허형호,최지용 대한내과학회 1990 대한내과학회지 Vol.39 No.5
Chronic neutrophilic leukemia is a rare myeloproliferative disorder characterized by a sustained high WBC, which is entirely due to the presence of mature neutrophil, hepatosplenomegaly, high neutrophil alkaline phosphatase score, absence of Philadelphia choromosome, and absence of a ceuse for leukemoid blood picture. A 66-year-old woman was diagnosed as having chronic neutrophilic leukemia. Peripheral blood showed leukocytosis with about 90 percent mature neutrophil and rare immature granulocyte. The neutrophil alkaline phosphatase score was high. A bone marrow study showed hypercellular marrow with neutrophilic hyper plasia. Cytogenetic study was normal, with no evidence of Philadelphia chromosome. The underlying disease which causes 1eukcmoid reacction was not detected. The patient had a hemorrhagic tendency, and a coagulation study showed prolonged aPTT. A coagulation factor assay showed deficiency of factor VIII, IX. The platelet function was abnormal on in vitro study showing failure to aggregate with epinepnrine, ristocetin, collagen, and ADP. The disease was well controlled with hydroxyurea.