다중 쓰레드 기반의 병렬처리서버용 안티바이러스 엔진

유주영;김미애;박은옥;박유미;최주영;최은정;김명주 서울여자대학교 컴퓨터과학연구소 2004 정보기술논문지 Vol.2 No.-

악성코드에 대한 보다 바람직한 예방은 클라이언트측이 아닌 서버측에서 이루어지는 것이다. 본 논문에서는 새로운 개념 의 서버용 안티바이러스 엔진인 SAVE 1.0을 설계 구현하여 제시한다. SAVE는 기본적으로 1개의 AV모니터와 다수의 AV에이전트로 구성되어 있는데 다중 CPU를 장착한 병렬처리서버의 특징을 직접 활용하기 위하여 관리자가 다중쓰레드 기법을 직접 지정할 수 있도록 하고 있다 악성코드를 5가지 부류로 구분하여 바이러스 시그너쳐 DB를 구축 제공함으로써 부류별 진단을 지정할 수 있도록 하고 있으며 실시간 네트워크 패킷 검사를 통한 악성코드 유입 점검 기능도 제공한다. 웹 기반의 관리자 인터페이스는 뛰어난 사용자 편의성을 제공하고 있다. 성능실험결과 악성코드 검색율은 국내외 상용제품과 비교해서 매우 우수한 것으로 나타났으며 검색속도에 있어서도 서버의 CPU 수 증가에 거의 선형 비례하여 향상되는 특징을 보이고 있다. It is more desirable to prevent and detect the malicious codes in server system rather than in client PCs. In this paper, we suggest a new anti-virus engine, SAVE 1.0, which is executed on a parallel processing server. SAVE consists of 1 AV monitor and several AV agents. A system administrator can control the degree of multi-thread directly in order to enhance the utilization of parallel processing servers. Virus signature DBs in SAVE are classified into 5 categories, which support system administrator's options to use the classifier or not. By real-time checking of network packets, the influx of malicious codes can be prevented. Web-based GUI is one of the convenient functions provided in SAVE. In performance tests, we have confirmed that SAVE has higher virus detection ratio than any other AV engine, and SAVE has a desirable feature as an software of parallel processing servers since the performance of SAVE is improved almost linearly as the CPUs in a parallel processing server increases.

Isoquinolinium Chlorochromate와 Quinolinium Chlorochromate를 이용한 알코올류의 선택적 산화반응

최선도,박영조,이은주 三陟大學校 産業科學技術硏究所 2003 産業科學技術硏究論文集 Vol.8 No.2

Isoquinolinium chlorochromate(C_(9)H_(7)NHCrO₃Cl) and quinolinium chlorochromate(C_(9)H_(7)NHCrO₃Cl) were synthesized. which were used to oxidize benzylic alcohol, allylic alcohol. primary alcohol and secondary alcohols in DMF to give aldehyde of each compound. Their structures were verified by IR, EA and ICP. The oxidation of alcohols was examined by isoquinolinium chlorochromate(C_(9)H_(7)NHCrO₃Cl) and quinolinium chlorochromate(C_(9)H_(7)NHCrO₃Cl) in DMF. As a result, isoquinolinium chlorochromate(C_(9)H_(7)NHCrO₃Cl) and quinolinium chlorochromate(C_(9)H_(7)NHCrO₃Cl) were found as efficicent oxidizing agents that converted benzylic alcohol, allylic alcohol, primary alcohol and secondary alcohols to the corresponding aldehydes or ketones. The selective oxidation of alcohols was also examined by isoquinolinium chlorochromate(C_(9)H_(7)NHCrO₃Cl) and quinolinium chlorochromate(C_(9)H_(7)NHCrO₃Cl) in DMF. isoquinolinium chlorochromate(C_(9)H_(7)NHCrO₃Cl) and quinolinium chlorochromate(C_(9)H_(7)NHCrO₃Cl) were selective oxidizing agents of benzylic alcohol. allylic alcohol and primary alcohol in the presence of secondary alcohols.

교실 색채환경 개선을 위한 연구 : 강원도 중학교 중심으로

최은주,최법진 강원대학교 조형예술연구소 2005 조형예술논문집 Vol.6 No.-

Colors are psychologically influential environment, and they play an important part in young students' emotions. Since young people spend most their time at school. Especially classroom colors are very important to students psychologically and emotionally. The preference of a person in charge and financial factors are mostly considered than the educational aspect for choosing colors used for the interior of secondary schools. This study examined the effect of colors on young students, and the importance of classroom colors. Also, it surveyed and analyzed the color preferences, the degree of the students' satisfaction with the present classroom colors, and the desired colors for classrooms of the middle school students in Kangwon-do. According to the result, students preferred the bright colors, and a great number of students were not satisfied with their classroom colors which are mostly colorless. It is also known that the students' negative attitude caused by classroom colors made students feel bored with their school life and those colors made their eyes tired easily. If we try to improve the classroom color environment, we will help students to enhance learning efficiency and to foster their emotions soundly.

여러 가지 상변화물질 슬러리의 원형관내 대류 열전달에 관한 연구

崔恩洙,鄭東柱 明知大學校 産業技術硏究所 2003 産業技術硏究所論文集 Vol.22 No.-

To investigate convective heat transfer of various the phase-change-material slurries in a circular tube, paraffin slurry, MC-lauric acid slurry, MC-octadecane slurry and ice slurry were tested in two kinds of heat transfer experimental apparatus with constant heat flux test section. Nusslet numbers of the phase-change-material slurries were found to increase when the phase-change- material melted. Nusselt number of the phase-change material slurry increased, as the size and fraction of the phase-change material increased. The effective thermal capacities of the phase-change-material slurries were higher than those of water. As fraction and fusion energy of the phase-change-material increased, the effective thermal capacity increased.

사회과학 연구자의 정보이용행태에 관한 연구

최은주 한국문헌정보학회 1996 한국문헌정보학회지 Vol.30 No.4

본 연구는 사회과학분야에서 학술정보를 이용하는 연구자집단을 표본대상으로 하여 이들이 연구 및 학술활동에 필요한 정보를 추구하는데 있어서 어떠한 현실적 특성을 지니고 있으며, 그러한 특성들이 정보이용행태에 어떻게 나타나는지를 규명해 보고자 함에 그 목적을 두었다. 자료수집은 1995년 7월 약 2주간에 걸쳐 국내 주요 사회과학분야 정보서비스기관 세 곳을 이용하고 있는 임의의 사회과학연구자 150명을 표본으로 추출하여 질문지를 배포, 회수하였으며 연구자들의 정보이용행태 특성 규명을 위해서 다섯 가지의 작업가설을 도출, 검증하였다. 연구의 결과 사회과학연구자들은 도서(단행본)나 학술지를 선호하며, 비교적 최신자료에 많이 의존하는 편이다. 이들이 연구착수단계에서 가장 먼저 접하는 정보원은 도서나 학술지에 인용된 참고문헌이다. 문헌탐색은 사서에게 많이 의존하는 경향을 보이나 온라인 정보검색은 직접탐색하는 편이다. 이들은 또한 최근의 정보기술발전에 따른 급격한 정보환경변화에 대체로 긍정적인 반응을 보이고 있다. 결론적으로 사회과학정보제공을 위한 효율적 정보시스템 설계를 위해서나 이용자들에게의 보다 원활한 정보이용을 제고하기 위해서는 이용자들의 특성과 현실을 감안함이 필수적임이 강조되었다 This study focuses on investigating and analyzing overall information use behavior of the social science researchers. Questionnaires were sent to 150 researchers in three major libraries or research institutes in the area of the social sciences. Five hypotheses were tested on the basis of the assumption that there would exist unique characteristics in the information seeking behavior of social science researchers. The findings of the study shows that social science researchers prefer monographs and journals; they tend to use current material; the first information source for their research activities is the cited references in the book or journal article; they are likely to delegate literature searching to the librarian, but they tend to conduct direct searching in online setting; in general, they react positively for the rapid change in information environment caused by recent development of information technology. It is emphasized that to design an efficient information system and provide an effective information service in the social science related library or information center, it is essential to consider the major characteristics and attributes of social science researchers in terms of their information use behavior

인터넷 상의 다중공격에 대비한 침입탐지시스템 모델 설계

최주영,최은정,이지윤,윤세안,김명주 서울여자대학교 자연과학연구소 2000 자연과학연구논문집 Vol.12 No.-

Since modern attacks against information system utilize large-scale and distributed network, they become more versatile and complicated. We propose a new model of intrusion detection system, IDSS that can effectively detect multiple resource attack from to the inter-system and intra-system. IDSS (Intrusion Detection System for Seoul women's university) is optimized in agent unit to detect multiple attacks on network effectively and designed to and respond to them in real time.

여러 가지 상변화물질 슬러리의 겉보기 점도

崔恩洙,鄭東柱 明知大學校 産業技術硏究所 2003 産業技術硏究所論文集 Vol.22 No.-

Abstract - The objective of the present study is to reveal hydrodynamic characteristics of various phase-change-material slurries, which have high latent heat during phase change from soled to liquid. In order to analysis hydrodynamic characteristics of various phase-change-material slurries, apparent viscosities of various phase-change-material slurries were measured by using a capillary tube viscometer and a rotating cylindrical viscometer. The phase-change-material slurries which are used in this study were paraffin slurry, microcapsulated octadecane slurry and microcapsulated lauric acid slurry. An aqueous separan of 1000ppm or water was used for carrier fluid. The slutty showed shear thinning behavior. The increasement of apparent viscosity was to proportional to it of the concentration of phase-change-material, and the increasement rate was not linear. The apparent viscosities of slurries increased, as size of phase-change-material particle decreased.

부산 일광산 습지의 식물상

최철만,정은주,이인섭 한국환경과학회 2003 한국환경과학회지 Vol.12 No.12

To investigate the flora of wetland at Mt. Il-Kwang, the helophyte of the mountain was examined. The flora observed was classified into 2 phyla, 15 families, 27 genera, and 34 species. Representative species at the wetland were Drosera rotundifolia, Utricularia racemosa, Utricularia bifida, Eriocaulon miquelianum, and Eleocharis attenuata var. laeviseta. In the lower part of the wetland, water was abundant and soil surface layer was thin, and Eriocaulon miquelianum-Carex canescens-Drosera rotundifolia community were developed. On the other hand, in the upper part of the wetland, water was not abundant and soil surface layer was thick, and Agrostis clavata-Phragmites japonica community were developed. Utricularia bifida and Utricularia yakusimensis were growing abundantly at this wetland, but Utricularia racemosa was few in number and narrow in the distribution area. Eriocaulon miquelianum, a Korean endemic plant, was observed, and Habenaria linearifolia, Spiranthes amoena, and Epipactis thunbergii, the CITES plant, were observed at this wetland. Insectivorous plant such as Drosera rotundifolia, Utricularia racemosa, Utricularia bifida, and Utricularia yakusimensis were also observed.

方向분산성이 고려된 海浜流 流動特性에 관한 연구

최은주,유수진,권정곤 부산대학교 환경문제연구소 1994 環境硏究報 Vol.12 No.-

This study was managed to develope the existing numerical calculation model of near shore current and wave fields where wave and current coexist around shallow water region, and analyse their problems. Until now, nearshore current model that include longshore current and on-off shore current had shown wave characteristic based on regular wave theory. In this study, however, nearshore current characteristic was changed by directional dispersion. So the effect of directional dispersion of multidirectional irregular wave was examined numerically by the basic study of nearshore current calculation due to multidirectional wave that was driving force of pollutant material at shallow water region.

경직성 뇌성마비아동의 도형-배경 색상역전과 시지각 및 시각-운동 수행능력

최은주,안병즙 大邱大學校 再活科學硏究所 1993 再活科學硏究 Vol.11 No.1

The present study was designed to investigate the effect of color reversal of figure-ground on visual perceptional and visuo-motor performance of cerebral palsied. The 20 spastic cerebral palsied and the 20 non-cerebral palsied children participated in the study as subjects. Perceptual subtest of perceptuo-Motor Development Diagnostic Test(PMDT) and Beery-Buktenica Development Test of Visual-Motor Intergration(VMI) were administered to assess visual perceptual and visuo-motor performance, respectively. The main conclusions from the study were as follows. First, the cerebral palsied subjects performed more poorly in both visual perceptional and in visuo-motor tasks than non-cerebral palsied counterparts. However, it was revealed that the relatively poor performance of the former in visual perceptual tasks were primarily due to Synthesis of Figure factor. Second, for spastic cerebral palsied subjects, the color reversal of testing materials had the facilitating effect on visual perception but not on visuo-motor. However, any improvement as a function of color reversal was evidenced neither in visual perceptioanl nor in visuo-motor performance of the non-cerebral palsied. Finally, presentation order did not produce significant improvement of visual perceptional and visuo-motor performance in either group. It suggest thath improvement by color reversal did not result from presentation order.