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실시간과 온라인 서비스를 보장하기 위한 능동망 시스템 ANGLE
강세훈,문경덕,이중수,이영희 에스케이텔레콤 (주) 2000 Telecommunications Review Vol.10 No.3
인터넷의 급속한 성장과 더불어 인터넷 서비스가 빠르게 변화되며 다양해지고 있다. 최근에는 멀티미디어 서비스의 대중화로 실시간 전송 및 온라인 처리 보장과 같은 QoS 문제가 중요한 이슈로 부각되고 있다. 그러나, 기존 네트웍 환경은 새로운 기술을 채용하여 표준화 하는데 많은 시간이 소요되기 때문에 새로운 서비스를 유연하게 수용하는데 있어 현실적으로 한계를 갖고있다. 본 논문에서는, 라우터에서 서비스에 특화된 실행코드를 동적으로 로딩하여 실행함으로써 네트웍의 유연성과 기능성을 향상시킨 ANGLE 시스템을 제안한다. ANGLE 시스템은 새로운 개념의 인터넷 서비스를 효과적으로 지원하기 위해 서비스에 특화된 네트웍 기능을 동적으로 라우터에서 수행하여, 네트웍의 급격한 환경 변화에 많은 영향을 받지않고 QoS를 보장할 수 있는 플랫폼이다. 또한, 통합 접근 방식과 이산 접근 방식의 장점을 혼용함으로써 라우터의 유연성과 기능성을 향상시킴과 동시에 안정성을제공한다. ANGLE 시스템에 대한 구조 설명과 더불어, 이질의 환경을 가진 수신자간 실시간 멀티미디어 트래픽제어 메커니즘인 ATLM과 온라인 경매 시스템을 통해 ANGLE의 효용성을 검증한다.
강세훈,김영학,최효인,이은영,안정민,한승봉,이필형,노재형,윤성한,박덕우,강수진,이승환,이철환,문대혁,박성욱,박승정 연세대학교의과대학 2017 Yonsei medical journal Vol.58 No.5
Purpose: Few studies have reported on predicting prognosis using myocardial perfusion single-photon emission computed tomography(SPECT) during coronary artery disease (CAD) treatment. Therefore, we aimed to assess the clinical implications of myocardial perfusion SPECT during follow-up for CAD treatment. Materials and Methods: We enrolled 1153 patients who had abnormal results at index SPECT and underwent follow-up SPECT at intervals ≥6 months. Major adverse cardiac events (MACE) were compared in overall and 346 patient pairs after propensity-score (PS) matching. Results: Abnormal SPECT was associated with a significantly higher risk of MACE in comparison with normal SPECT over the medianof 6.3 years (32.3% vs. 19.8%; unadjusted p<0.001). After PS matching, abnormal SPECT posed a higher risk of MACE [32.1% vs. 19.1%; adjusted hazard ratio (HR)=1.73; 95% confidence interval (CI)=1.27–2.34; p<0.001] than normal SPECT. After PS matching,the risk of MACE was still higher in patients with abnormal follow-up SPECT in the revascularization group (30.2% vs. 17.9%; adjusted HR=1.73; 95% CI=1.15–2.59; p=0.008). Low ejection fraction [odds ratio (OR)=5.33; 95% CI=3.39–8.37; p<0.001] and medical treatment (OR=2.68; 95% CI=1.93–3.72; p<0.001) were independent clinical predictors of having an abnormal result on follow-up SPECT. Conclusion: Abnormal follow-up SPECT appears to be associated with a high risk of MACE during CAD treatment. Follow-up SPECT may play a potential role in identifying patients at high cardiovascular risk.
A Semantic Service Discovery Network for Large-Scale Ubiquitous Computing Environments
강세훈,이영희,이동만,Daewong Kim,현순주,벤리 한국전자통신연구원 2007 ETRI Journal Vol.29 No.5
This paper presents an efficient semantic service discovery scheme called UbiSearch for a large-scale ubiquitous computing environment. A semantic service discovery network in the semantic vector space is proposed where services that are semantically close to each other are mapped to nearby positions so that the similar services are registered in a cluster of resolvers. Using this mapping technique, the search space for a query is efficiently confined within a minimized cluster region while maintaining high accuracy in comparison to the centralized scheme. The proposed semantic service discovery network provides a number of novel features to evenly distribute service indexes to the resolvers and reduce the number of resolvers to visit. Our simulation study shows that UbiSearch provides good semantic searchability as compared to the centralized indexing system. At the same time, it supports scalable semantic queries with low communication overhead, balanced load distribution among resolvers for service registration and query processing, and personalized semantic matching.