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주우석,박경희,유승열,최병석 明知大學校 産業技術硏究所 1995 産業技術硏究所論文集 Vol.14 No.-
We propose a new architecture of multicast ATM switch which has input and output buffers and uses Multicast Ring Reservation Algorithm to resolve output port contention. This new algorithm eliminates internal cell loss due to contention, and reduces the hardware complexity. We can dynamically control the number of cells routed to a specific output port during one cell time with this contention resolution algorithm. The computer simulation is performed under bursty traffic condition to show the performance of this proposed multicast ATM switch.
고병섭,주혜정,마진열,박갑주,안상우 한국한의학연구원 1996 한국한의학연구원논문집 Vol.2 No.1
In order to improve the qualities of boiling extract the availability of standard compounds was investigated in extract of Scutellariae Radix. The standard compounds used baicalin(1), baicalein(2), and wogonin(3). The availabilities were analyzed by thin layer chromatography(TLC) and high performance liquid chromatography(HPLC) on C18 column. The extract of RS-4(W/V=10g/100ml) showed the highest availabilities as 7.95% of baicalin(1), 1.04% of baicalein(2), and 0.31% of wogonin(3).
In-Situ 반응소결에 의한 전도성 Si₃N₄-TiN 복합세라믹스 제조
이병택,박동수,윤여주,김해두 공주대학교 자원재활용 신소재 연구센터 1999 1차년도 센터 성과집 Vol.1999 No.-
전도성 Si₃N₄-TiN세라믹 복합재료를 제조하기 위해 성형체를 1450℃에서 20시간 질화처리한 후 1950℃에서 3.5시간 가스압소결 기술에 의해 후소결하였다. 초기 분말로 약 10㎛로 된 상용 Si분말, 100mesh와 325mesh로 된 Ti분말, 그리고 미세한 2.5㎛ Ti분말을 사용하였다. Ti분말을 사용한 Si₂N₄-TiN소결체에서 상대밀도 및 파괴인성값은 다량의 조대한 기공의 존재로 인하여 낮은 값을 보였다. 그러나 Ti분말을 사용한 Si₃N₄-TiN복합체에서 파괴인성, 파괴강도, 및 전기저항은 각각 5.07MPaㆍm1/2, 624MPa 그리고 1400Ωm였다. 복합체에서 TiN 입자의 분산은 Si₃N₄입자의 조대한 봉상형태로의 성장을 방해아며 Si₂N₄/TiN계면에 강한 변형장을 만든다. Si₂N₄-TiN복합체의 전기전도도 및 기계적 특성을 향상시키기 위해 TiN 입자가 균일하게 분산된 미세조직 제어가 요망된다. In order to maek the electroconductive Si₂N₄-TiN composites, the Si-Ti(N) compacts were nitrided at 1450℃ for 20hours, and thhn they post-sintered by a gas-pressure-sintering technique at 1950℃ for 3.5hours. As starting powders, commercial Si powder of about 10㎛, two types of Ti poweders, the relative density and fracture strength and electrical conductivity are low due to the existence of large amounts of coarse pores. However, in the Si₃N₄-TiN composite used Tin powder, the fracture toughness, fracture strength and electrical resistivity were 5.07MPaㆍm1/2, 624MPa and 1400Ωcm, respectively. The dispersion of TiN particles in the composite inhibited the growht of Si₃N₄, in the shape of rod and made strong strain field contrasts at the Si₃N₄/TiN interfaces. It was recognized that microstructural control is required to improve the electrical conductivity and mechanical properties of Si₃N₄-TiN composites vy dispersing TiN particles homogeneously.
1996년과 1999년 경기지역 초등학교 학생들에서 유행성이하선염에 대한 면역도 조사
나병국,이주영,고운영,이진수,신구철,이주연,최보율,기모란,양병국,강춘,김우주,김지희 대한감염학회 2001 감염 Vol.33 No.3
Background : Although massive use of live attenuated mumps virus vaccines successfully reduced the incidence of mumps virus infection worldwide, mumps outbreaks have not been completely eliminated, even in vaccinated populations. In recent years, the incidence of mumps has been remarkably increased in Korea. This study was designed to evaluate the recent seroprevalence rate of mumps IgG among children in Kyonggi province at 1996 and 1999. Methods : Study population included students from 8 elementary schools in Kyonggi province. Serum samples were collected twice at 1996 and 1999 and tested for mumps-specific antibody by enzyme-linked immunosorbent assay (ELISA). We also conducted a questionnaire survey on the parents and collected the records including history of vaccination and mumps infection. Results : The seropositive rates against mumps were 89.47% and 89.74% at 1996 and 1999, respectively, and they were not significantly different when compared to age, sex, and region. Although the first vaccination rates were 92.17% and 92.25% at 1996 and 1999, respectively, the second vaccination rates were only 37.89% and 38.03% at 1996 and 1999, respectively. Infection rate showed no significant difference between vaccinated groups and nonvaccinated gropus. Seropositive rate of infected group was higher than that of noninfected group but it was not significantly different between the vaccinated and the nonvaccinated. Conclusions : This study showed the seropositive rate and vaccination against mumps in children. There were no significant relationships between vaccination and infection. Therefore, it seems likely that the vaccination is not fully protective against mumps infection. This study will be helpful for the establishment of guideline for prevention and treatment of mumps in Korea. (Korean J Infect Dis 33: 157∼164, 2001)
고분자 이미다졸-금속 착제 LB막의 선책적 기체 투과성
김병주,이범종 인제대학교기초과학연구소 1999 자연과학 Vol.3 No.-
이미다졸-금속 이온구조를 갖는 고분자 Langmuir-Blodgett(LB)막을 다공성 막 필터 위에 제조하여 산소와 질소의 투과성을 이들의 캐스트 막과 비교하여 검토하였다. 양친매성 고분자 폴리(N-(2-(4-이미다졸일)에틸)말레이미드·alt-1-옥타데센)(IM-O)는 폴리(무수말레산-alt-1-옥타데센)과 히스타민의 반응으로 합성되었다. IM-O는 순수한 물 또는 금속 이온 (철(Ⅲ)과 코발트(Ⅱ)이온)하층액 위에서의 40 mN/m의 표면압력에서도 안정한 일분자막을 유지하였다. 이 일분자막은 30 mN/m의 표면 압력에서 FP-010 막 필터 위에 Y형태로 누적되었다. 이 다중막의 구조는 FT-IR을 통하여 확인하였다. LB막의 균일성과 안정성은 SEM 관찰을 통하여 간접적으로 평가하였고, 산소와 질소의 투과도는 감압법을 이용하여 측정하였다. 본 LB막들의 기체 선택성은 산소보다 질소가 약간 높게 나타났으며, 두 기체에 대하여 모두 고투과성을 나타냈다. 이들 고분자-금속 착체의 캐스트 막을 제조하여 기체 투과도를 측정한 결과 질소에 대한 선택성은 변함이 없었다. The permeability of oxygen and nitrogen was investigated from the polymeric LB films containing imidazole-metal ion complexes and compared with its corresponding cast films on porous membrane filters. The amphiphilic polymer, poly(N-(2-(4-imidazolyl)ethyl)-maleimide-alt-1-octadecene)(IM-O), was synthesized by reaction of poly(maleic anhydride-alt-1-octadecene)with histamine. Chloroform solutions of IM-O were spread on pure water and aqueous metal ions(iron(Ⅲ) and cobalt(Ⅱ)ions) and the monolayers showed high stability up to 40 mN/m against surface pressure. The monolyers of polyion-complexed polymers at the air-water interface can be transferred onto solid substrates such as a porous fluorocarbon membrane filter(FP-010) and a CaF2 plate. The Y-type deposition was found at a surface pressure of 30 mN/m. The molecular structures of LB films were investigated by means of FT-IR spectroscopy. The mechanical stability and uniformity of the LB films on FP-010 membranes were indirectly evidenced by SEM observation of the surface morphology of FP-010 membranes were indirectly evidenced by SEM observation of the surface morphology of FP-010 covered with the LB films. The permeability of oxygen and nitrogen was measured with the pressure method. The LB films showed more or less higher selectivity toward nitrogen, and high permeability was found to both the oxygen and nitrogen. The cast films of the corresponding polymer-metal complexes also showed preference to nitrogen in selectivity.
한국의 아랍 중동학II : 석박사학위 논문의 연구 동향 분석 The Trends of MA & PHD Theses Research
하병주 釜山 外國語 大學校 1996 外大論叢 Vol.14 No.1
The intention of the study was to examine Korean Arab and Middle East research trends by referring to MA & PHD theses from 1978 to the half of 1994. I was therefore concerned more with what Middle East Specialists were doing. I was also concerned with tile diffusion of scholarship and the encouragement of cumulative research. I hoped to provide solute intellectual justification for the selection of research topics. For the analysis I mainly consulted the Data Base of MA & PHD theses which the National Assembly Library furnishes. The total numbers of degree theses mounts up to 333 (314 MA and 19 PHD theses). Many graphs and tables which appeared in the study were produced by using a MS Works v. 3. According to the study, the scope and the depth of the researches was gradually expanded, and at the same time academic interests became to be diversified within the areas of Arab and the Middle East studies. However, the analysis showed that scholars'(students') interest on Arab and the Middle East somewhat concentrated in the area of social sciences rather than the other areas. It also indicated that the proportion of theses submitters who belong to the Korean Association of the Middle East Studies to the others has decreased gradually.
"지역학(Area Studies)" 강좌의 멀티미디어 콘텐츠 개발 방안 : '멀티미디어 아랍문화기행' 강좌를 중심으로 Multimedia Arab Culture
하병주 부산 외국어 대학교 2004 外大論叢 Vol.28 No.-
The evolution of the world wide web is now a emerging learning and instructional technology tool. It especially develops the field of ICT (Information Communication Technology), such as CALL (Computer, Assisted Language Learning), CAI (Compute Assisted Instruction), CBT (Computer Based Training), Edutainment (Education + Entertainment), etc. 'Area Studies (Areaology, Area Sciences)' is one of subjects which can be built by using the technology. In this context the paper tries to examine a model for web-based learning and teaching. It focuses on the lecture on 'Arab Culture' which belongs to the field of Area Studies.
안전한 네크워크 환경을 위한 IP 역추적 시스템에 관한 연구
채철주,김재동,최병선,김지현,이재광 韓南大學校 2007 論文集 (인문·사회·자연과학·공학) Vol.37 No.-
컴퓨터 통신 네트워크의 급속한 발전은 사회 전반적인 부분에 많은 발전을 가지고 왔으나 이러한 통신 기술의 발전은 악의적인 목적을 가진 사용자들의 침입 증가라는 부작용을 초래하였다. 이로 인하여 좀 더 안전한 사이버 세상을 요구하는 많은 요구 사항들이 나타나고 있다. 이처럼 인터넷이 우리사회 전반의 지식 정보화 사회의 기반으로 발전하고 있는 반면, 정보통신망 역기능인 정보변조,해킹 등과 같은 불법적인 요소가 난무하는 장소로 변질되고 있는 것 또한 현실이다. 정보의 개방으로 인해 해킹 기술의 접근이 손쉬워진 현 상황에서 네트워크상에서 서비스를 제공하는 호스트들에 대한 보안 강화는 필수적인 요소로 대두되고 있다. 이러한 문제를 해결하기 위해서 본 논문에서는 능동적인 보안 시스템으로 IP 역추적 시스템을 제안하여 위와 같은 문제점들을 해결하고자 한다. There is a tremendous increase in the growth of Internet making people's life easy. The rapid growth in technology has caused misuse of the Internet such as cyber Crime. There are several vulnerabilities in current firewall and Intrusion Detection Systems (IDS) of the network computing resources. Automatic real time station chase techniques can track the Internet invader and reduce the probability of hacking. Due to the recent trends the station chase technique has become inevitable. In this paper, we design and implement lP traceback system using ICMP Traceback message. In this design there is no need to modify the router structure and we can deploy this technique in larger network. Our Implementation shows that ICMP Traceback system is safe to deploy and protect data in Internet from hackers and others.