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김장환(Jang-Hwan Kim),이현주(H.J.Lee),장혜경(H.K.Jang),이광희(K.H.Lee),이충세(ChungSei Rhee),문양세(Y.S.Moon),조문증(M.J.Joe),서홍석(H.S.Seo),황규영(Kyu-Young Whang) 한국정보과학회 2001 한국정보과학회 학술발표논문집 Vol.28 No.2Ⅰ
HLR 데이터베이스 시스템은 이동 통신 망에서 지속적으로 변하는 가입자의 위치 정보를 관리한다. 본 논문에서는 이동 전화 번호를 위한 2단곌 색인 기법과 단말번호를 위한 bucket 연결 hashing 기법을 제안하였다. 또한 HLR 시스템의 특성을 고려한 효율적인 백업 방법을 제안하였다. 아울러 IMT2000 서비스로의 진화에 필수적인 보안 기능 수행을 고려한 HLR 데이터베이스 Scheme을 제안하였다.
산불 열영향 범위 산정을 위한 실험 및 FDS 데이터 비교
김형식 ( H S Kim ),강영진 ( Y J Kang ),김장환 ( J H Kim ),김경하 ( K H Kim ),이병두 ( B D Lee ),김정훈 ( J H Kim ) 한국안전학회(구 한국산업안전학회) 2014 한국안전학회지 Vol.29 No.4
This research deals with the combustion experiment of pine trees, which are the most representative species in Korea. Experimental data are compared with theoretical ones using Fire Simulation Program(FDS). It is considered that horizontal/verticaltemperature distribution and radiant heat influence on adjacent areas in fire scenes. The linear function for separation distance totemperature was drawn by applying Stefan-Boltzmann``s law; y=112.13133×(σT4)-0.52916 for calculating the separation distance. Incombustion experiment, the radiant heat came to 1.4∼1.5kW/㎡ in case of the separation distance by one meter. The numerical valuesmean that human body show the critical level of pain after one minute without a protective equipment.
김혜원(H. W. Kim),김동아(D. A. Kim),김장환(J. H. Kim),서원산(W. S. Seo),손병창(B. C. Son),추유진(Y. J. Choo),이진복(JB. Yi) 한국재활복지공학회 2018 재활복지공학회논문지 Vol.12 No.4
본 연구는 국내의 보조기기 분류가 법과 제도에서 통일성이 부족하고 최신 국제표준이 반영되어 있지 않으며 보조기기를 서비스할 보조공학사의 직무대상 범위도 분명하지 않는 등 많은 문제에 처해있는 상황을 분석하고 이를 개선할 수 있는 새 분류체계를 제시하기 위해 진행되었다. 국내의 법과 제도에서는 ‘보조기기’를 포함해 모두 9가지의 유사 명칭이 혼재되어 있어 ‘장애인보조기기법’의 제정을 무색하게 하고 있으며, 5년마다 갱신되고 있는 국제표준 최신판도 아직 도입되지 않고 있다. 이러한 문제의 해결을 위한 분류체계개선안은 최상위에 3종의 분류를 추가하고 최신 국제표준의 변화상을 반영하였으며 신기술 제품을 편입할 수 있도록 부분적으로 확장하였다. 이 개선안을 통해 미흡한 법 · 제도를 보완하여 공급자는 보조기기 관련사업 영역의 불확실성을 해결하고 수요자는 그 가치를 효과적으로 누릴 수 있을 것이다. The research was conducted with the purpose of improvement of the national classification system for the assistive products. Based on the law and the systems that are in tact, with the inclusion of the term "assistive products", there are 9 similar labels that are being used for assistive products. With the most recent version for the international standard, which is revised every 5 years, It’s not being taken into consideration for over the past 6 years. The need for the new classification system for assistive products and remedy was suggested following a comparison that was conducted between the most up-to-date international standard and the 2011 international standard, which is the current basis by which assistive products are classified, and an observation of the current domestic situation which is facing problems associated with provisions in the law. The research is able to supplement inadequacies associated with laws dealing with assistive products and can provide stability and effectiveness to demanders while also providing suppliers with methods to enhance productive capacity.
고온초전도체 Y₁Ba₂Cu₃O7-δ 박막의 Hall 효과
허재호(J. H. Her),류제천(J. C. Ryu),김형국(H. K. Kim),김장환(J. W. Kim) 한국자기학회 1994 韓國磁氣學會誌 Vol.4 No.1
High Tc superconducting Y₁Ba₂Cu₃O_(7-δ) thin film was grown up for c-axis orientation by epitaxial growth method on LaAlO₃ single crystal substrate. The crystal structures of this thin film were found to be c-axis orientation by X-ray diffraction patterns. Hall effect and resistivity measurements were made by van der Pauw method. Hall resistivity was calculated from the magnetoresistivity by considering thermomagnetic effect. The relation was ρ_H = ρ_stanα_n - QBT Ss/Ks The measured Hall resistivity and the calculated one are in good agreement each other.
물 사출성형의 잔류 벽두께에서 발생하는 기포 형성에 관한 연구
박형필(H. P. Park),김장환(J. H. Kim),최순호(S. H. Choi),차백순(B. S. Cha),김옥래(O. R. Kim),김동한(D. H. Kim),이병옥(B. O. Rhee) 한국소성가공학회 2012 금형가공 심포지엄 Vol.2012 No.9
This report was to study the fluid injection molding using both water and silicone oil. The effect of thermal properties was studied in terms of their influence on void formation. We were conducts heat transfer analysis and injection molding simulation for water and silicone oil. The temperature distribution of the polymeric material during the cooling process was analyzed. And the different specific volume for thickness effect voids formation. In experiment, the residual wall thickness in curved sections was thick around outer wall and around inner wall. And silicone oil was able to get the results of the void does not occur.