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서홍석,Seo, Hong-Seok 한국컴퓨터사용자협회 2005 The USERS Vol.44 No.-
리치 웹 커뮤니케이션, 공동 작업 및 교육을 위한 차세대 시스템인 Macromedia Breeze, 온라인 회의, 프레젠테이션 및 교육 과장을 통해 중요한 정보를 신속하고 간단하게 공유하는 것은 물론 기술 수준에 관계없이 누구든지 익숙한 PowerPoint 어플리케이션을 사용하고 인터넷을 통해 Macromedia Flash 형식의 정보를 공유함으로써 단 몊 시간 내에 프리젠테이션 환경을 구축할 수 있다.
〈기술논문〉 레진이 피복된 카렌더기의 롤 크라운양(roll crown) 설계에 관한 연구
서홍석(Hong Seok Seo),조순옥(Soon Ok Jo),박대규(Dae Kyu Park),임문혁(Moon Hyuk Im),전두환(Du Hwan Chun) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.11
A major design parameter of a calender roll for maintaining even contact pressure in the direction of the axis, in fabric processing, is the amount of crown on the roller. The amount of crown is based on experience in the production facility. The contact pressure is affected by the deflection of the roll as well as the deformation caused by the contact. In this study, an experimental apparatus for measuring the contact pressure and the amount of deflection was constructed. Then measurements such as contact width, contact pressure, and deflection caused by the amount of crown and fluctuation of the load were taken. An ANSYS based model was used to determine the amount of crown resulting in an uniform distribution of contact load. Comparison of the results of the model and the experiments were surprisingly close. Through this study, the relationship between the load and amount of crown for obtaining the optimal contact pressure was clarified.
한국인의 혈중 Lipoprotein ( a ) 농도와 Apolipoprotein ( a ) 유전적 표현형 분포특성
서홍석(Hong Seog Seo),오동주(Dong Joo Oh),이상칠(Sang Chil Lee),임도선(Do Sun Lim),박창규(Chang Kyu Park),김영훈(Young Hoon Kim),심완주(Wan Joo Shim),노영무(Young Moo Ro),김순덕(Soon Duk Kim),유재명(Jae Myung Yu) 대한내과학회 1996 대한내과학회지 Vol.50 No.5
N/A Lipoprotein(a)[Lp(a)] is a cholestryl ester-rich lipoprotein composed of two components' an LDL -like particle to which is attached a single large glycoprotein, apolipoprotein(a)[apo(a)]. Elevated concentrations of Lp(a) have been established as a geneticalqly controlled risk factor for atherosclerotic vascular disease. Variable alleles at the apo(a) gene locus determine, to a large extent, the Lp(a) concentration in the general population. To determine and compare the mean and distribution of Lp(a) concentration, apo(a) phenotypes and allele frequencies of Lp(a) in Korean people and other several esthnic groups, we investigated the Lp(a) plasma concentration, apo(a) phenotypes and other lipid profiles in 481 Korean People, who were consisted of 280 cases with non-atherosclerotic vascular disease and 201rases with atherosclerotic vascular disease. Mean concentrations of Lp(a) in Korean people were 27.3±28.6mg/dl in cases with non-atherosclerotic vascular disease an 29.9±31.2mg/dl in cases with atherocslerotic vascular disease. No differences was found in Lp(a) doncentration between the two groups. Lp(a) concentration of Korean people was simular to those of Indian, but far higher than those of Caucacian, Chinese or Japanese. Proportion of those below 5mg/dl of Lp(a) concentration was 26.6%, and those below 30mg/ dl was 68.0%. Frequency distribution patterns of Lp(a) concentrations in Korean population were similar to those of Chinese, Japanese and Malysian, but different from those of Caucacian, Indian of African. In apo(a) phenotype of Korean, the mode of single band was S3(44.3%), and the mode of double bank was S3S4(8.2%), which were similar to those of Chinese, Malysian and Indian. Order of allele frequencies of Lp(a) of Korean was Lps4, null(Lp0), Lps3, Lps2, and Lps1. Similar frequency was seen in those of Chinese, and other Asians execpt Japanese, but not in those of Caucacian and black people. Lp(a) concentration was not correlated with any other lipid profiles. Homology of study samples with Korean population was confirmed by Hardy-Weinberg equilibrium test. These results show that Korean people has higher concentration of Lp(a) in Asian, and has characteristics of apo(a) phenotype and Lp(a) allele frequences.
객체관계형 데이타베이스 시스템에서의 새로운 고립화 수준
서홍석(Hong-Suk Seo),장지웅(Ji-Woong Chang),문양세(Yang-Sae Moon),황규영(Kyu-Young Whang),홍의경(Eui-Kyung Hong) 한국정보과학회 2001 정보과학회논문지 : 데이타베이스 Vol.28 No.3
데이타베이스의 성능향상을 위하여 관계형 DBMS에서는 엄정 이단계 로킹을 따르는 고립화 수준 3대신 고립화 수준 2의 변형인 커서 안정성이 유용하게 사용되어 왔다. 그러나, 객체 관계형 DBMS(object relational DBMS: ORDBMS)의 탐색항해 응용에 대해서 허상 포인터 문제, 갱신 분실 문제, 그리고 일관성을 잃은 복합객체를 읽는 문제와 같은 심각한 일관성 문제로 인하여 커서 안정성은 ORDBMS에서는 더 이상 유용한 수준이 되지 못한다. 본 논문에서는 ORDBMS에서 수준 3의 동시성 저하를 피하는 동시에 커서 안정성의 일관성 문제를 해결하는 새로운 고립화 수준인 탐색항해 안정성 (navigation stability)을 제안한다. 먼저, 탐색항해 응용에 대한 커서 안정성의 일관성 문제를 분석한다. 다음으로, 커서 안정성을 확장하여 탐색항해 안정성을 정의하고, 탐색항해 안정성이 ORDBMS의 탐색항해 응용에 대한 커서 안정성의 일관성 문제를 일으키지 않음을 증명한다. 마지막으로, 성능 평가를 통해 수행 시간이 긴 트랜잭션의 경우에 탐색항해 안정성은 수준 3에 비해 성능을 최대 200%까지 향상시키고, 평균 응답 시간을 최대 55% 줄이며, 트랜잭션의 철회율을 최대 77% 줄임을 보였다. 이러한 결과로부터, 탐색 항해 안정성은 ORDBMS에서 일관성을 거의 희생하지 않고도 성능 향상을 위해 수준 3 대신 사용할 수 있는 유용한 고립화 수준임을 의미한다. In order to enhance the performance, cursor stability, which is a variant of isolation level 2 in relational DBMSs, has been widely used in place of isolation level 3, which uses strict two phase locking. However, cursor stability is much less usable in object-relational DBMSs (ORDBMSs) because navigational applications in ORDBMSs can suffer from critical inconsistency problems such as dangling pointers, lost updates, and reading inconsistent complex objects. In this paper, we propose a new isolation level, navigation stability, that prevents the inconsistency problems of cursor stability for navigational applications, while avoiding significant degradation of the concurrency of level 3. First, we analyze the inconsistency problems of cursor stability for navigational applications. Second, we define navigation stability as an extension of cursor stability and show that it solves those inconsistency problems of cursor stability in ORDBMSs. For workloads consisting of transactions of long duration, compared with level 3, the throughput of navigation stability is enhanced by up to 200%; the average response time reduced by as much as 55%; and the abort ratio reduced by as much as 77%. From these results, we conclude that navigation stability is a useful isolation level in ORDBMSs that can be used in place of isolation level 3 to improve the performance and concurrency without significantly sacrificing consistency.