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공인 인증서 검증 프로토콜 SCVP의 구현 방안에 관한 연구
안연정(Youn Jung Ahn),백선욱(Seon Uck Paek) 상명대학교 공학기술연구소 2003 공학기술연구 Vol.2003 No.2
In this paper, the implementation result of SCVP(Simple Certificate Verification Protocol) is described. The previous verification protocol, OCSP, can verify only the state of a certificate and cannot verify certification path or certification policies. We developed SCVP on OpenSSL-0.9.7 and interworked it with OCSP, thus the proposed system can verify the state of the certificate, certification path and certification policy.
SCVP 를 이용한 전자 인증서 검증 시스템의 구현에 관한 연구
안연정 ( Youn-jung Ahn ),백선욱 ( Seonuck Paek ) 한국정보처리학회 2004 한국정보처리학회 학술대회논문집 Vol.11 No.1
본 논문에서는 PKI 에서 사용자 인증을 위해 발급되는 전자 인증서 검증을 위해 IETF 에서 표준화 작업 중인 SCVP(Simple Certificate Validation Protocol) 구현 및 테스트 결과를 기술한다. 기존의 전자 인증서 검증 시스템으로 사용되고 있는 OCSPv1 은 전자 인증서의 폐지 목록(CRL)을 통한 상태 검증만을 할 뿐으로 전자 인증서의 발급 경로에 대한 검증이나 CA 에서 발급 당시의 정책이 변경되었을 경우에 대한 검증 기능은 제공하지 못하고 있다. 본 논문에서는 SCVP 를 OpenSSL-0.9.7 상에서 구현하여 기존의 OCSPv1 과 연동함으로써 전자 인증서 발급경로 검증 및 전자 인증서 발급 정책의 변경은 물론 기존의 인증서 상태 검증도 할 수 있도록 하였다.
64열 다중검출 CT를 이용한 관상동맥 스텐트재협착의 평가
서명기 ( Myung Ki Seo ),고진신 ( Jin Shin Kho ),박소라 ( So Ra Park ),강영란 ( Young Ran Kwang ),강민경 ( Min Kyeng Kang ),조정현 ( Jung Hyun Cho ),안연정 ( Youn Jung An ),최봉룡 ( Bong Ryong Choi ),정영훈 ( Young Hoon Jeong ) 대한내과학회 2009 대한내과학회지 Vol.76 No.4
Background/Aims: Multidetector computed tomography (MDCT) is considered to be a noninvasive, alternative method for evaluating stent restenosis. However, the diagnostic accuracy of 16-channel MDCT for stent stenosis is reported to have severe limitations because of high-attenuation stent-related artifacts. 64-channel MDCT, which recently became available in clinical practice, has better spatial and temporal resolution than 16-channel MDCT. The diagnostic accuracy of 64-channel MDCT for stent restenosis (in-segment and in-stent) was assessed by comparing it with conventional coronary angiography. Methods: In-segment and in-stent restenosis (≥50% in diameter) were evaluated in 96 stent segments in 68 patients [61±12 years, 51 (75%) male] using both 64-channel MDCT and conventional coronary angiography. The in-stent analysis was confined to the portion of the artery covered by the stent and the in-segment analysis included the stent and 5 mm proximal or distal to the stent edges. Results: The 64-channel MDCT could evaluate stent restenosis in 93 of 96 (97%) stent segments. Quantitative conventional coronary angiography found in-segment restenosis (≥50% in diameter) in 16 of 68 (23%) patients and 16 of 96 (17%) segments. For the patients with interpretable stent segments, the sensitivity, specificity, positive predictive value, and negative predictive value of 64-channel MDCT for in-segment restenosis per patient were 63, 96, 83, and 89%, respectively; per segment they were 63, 97, 83, and 93%, respectively; and for in-stent restenosis per stent they were 82, 98, 82, and 98%, respectively. Conclusions: The diagnostic accuracy of 64-channel MDCT for assessing stent restenosis had high specificity and negative predictive value in the clinical setting. The 64-channel MDCT may be a promising, less-invasive imaging tool for stent restenosis, especially for the purpose of excluding stent restenosis. (Korean J Med 76:434-442, 2009)