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이혁민(Hyuk-Min Lee),김경창(Kyung-Chang Kim) 한국정보과학회 2002 한국정보과학회 학술발표논문집 Vol.29 No.2Ⅰ
본 논문에서는 기존의 서버 기반 데이터 웨어하우스 유지 전략에 대한 문제점들을 해결하기 위해 클라이언트 기반 웹 하우스 유지 전략을 제시한다. 소스 시스템에서 데이터 갱신이 발생했을 경우 브라우져 모니터를 통해 자동적으로 웹하우스에 실시간 반영하도록 하여 모든 사용자 요청을 서버에서 처리하는 부담을 줄이고 사용자가 많더라도 웹하우스 시스템의 처리부담을 최소화할 수 있도록 클라이언트에서는 결과 데이타 재사용/질의 재생성을 사용하여 서버의 자원 사용을 최소화할 수 있도록 하였다. 모든 클라이언트 프로그램은 자동적으로 설치되고 관리되므로 프로그램이 변동되더라고 쉽게 유지될 수 있으며 소스 시스템에는 어떠한 처리 부담도, 어떠한 프로그램도 설치하지 않기 때문에 실제 비즈니스 현실에서 적용하기가 용이하다.
이현수(Hyun soo Lee),이혁민(Hyuk min Lee),방명극(Myung gug Bang),안병석(Byung suk Ahn),박인흠(In hum Park) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
The conventional low beam performance is around 70m, so it can not be provided the ideal nighttime lighting to drivers. And high beam gives the enough visibility in nighttime but it makes dazzling problems to other road users. Therefore the state of the art in lighting division is focusing a permanent high beam without dazzling for night driving situation. High Beam Assistant (HBA) system is already on the market. It simply switches between low and high beam based on camera signal. But it takes “Black hole” effect when high beam Changes to low beam. It cause a side effect to drivers which is time delay to recognize situations. So we need to develop the new system which improves the performance without dazzling and reduce the side effect. This system (Adaptive beam pattern system) replaces low- and high-beam lights with a single light beam that varies gradually and continually between two beam positions. It is a progressive transition between low beam and high beam, equivalent of a dynamic automatic aiming with integration of oncoming/ preceding car and also vertical road geometry by image processing. Therefore the road ahead is better illuminated without glare of other road users and obstacles can be detected earlier than conventional low beam.
최공림(Kong-Rim Choi),이혁민(Hyuk-Min Lee),김경창(Kyung-Chang Kim),김기룡(Ki-Ryong Kim) 한국정보과학회 1995 한국정보과학회 학술발표논문집 Vol.22 No.2A
본 논문에서는 주기억 데이타베이스(MMDB) 시스템에서의 효율적인 인덱스 구조를 제시한다. T* 트리 색인 구조는 기존의 디스크 기반 색인 기법과는 달리 모든 데이타가 주기억장치에 적재되어 있는 시스템에서 빠른 접근과 메모리 공간의 효율적인 사용을 위해 이제까지 주로 사용한 주기억 데이타베이스에서는 시용된 T 트리를 보안한 새로운 인덱스 구조이다. T 트리는 한 노드내에 여러 개의 정렬된 아이템을 가지는 하나의 이진 트리로서 AVL 트리와 B 트리의 특성을 결함한 것으로 기존의 타 색인구조에 비하여 아이템의 검색, 삽입 및 삭제 등의 연산에 있어 보다 향상된 성능과 기억공간 활용의 효율성이 보였다. 본 논문에서 제시하는 T* 트리는 데이타 아이템에 대한 빠른 검색을 지원하는 T 트리의 모든 장점을 그대로 수용하고, T 트리에서의 단점인 범위 질의(range query)을 보완함으로써 주기억 데이타베이스에 보다 적합한 색인 기법이라 생각된다.
운전자 시인성 향상을 위한 가변형 빔패턴 기반의 헤드램프 시스템
이현수(Hyun soo Lee),이혁민(Hyuk min Lee),방명극(Myung gug Bang),안병석(Byung suk Ahn),박인흠(In hum Park) 한국자동차공학회 2012 한국자동차공학회 학술대회 및 전시회 Vol.2012 No.11
The conventional low beam performance is around 70m, so it can not be provided the ideal nighttime lighting to drivers. And high beam gives the enough visibility in nighttime but it makes dazzling problems to other road users. Therefore the state of the art in lighting division is focusing a permanent high beam without dazzling for night driving situation. High Beam Assistant (HBA) system is already on the market. It simply switches between low and high beam based on camera signal. But it takes “Black hole” effect when high beam Changes to low beam. It causes a side effect to drivers which is time delay to recognize situations. So we need to develop the new system which improves the performance without dazzling and reduce the side effect. This system (Adaptive beam pattern system) replaces low- and high-beam lights with a single light beam that varies gradually and continually between two beam positions. It is a progressive transition between low beam and high beam, equivalent of a dynamic automatic aiming with integration of oncoming/ preceding car and also vertical road geometry by image processing. Therefore the road ahead is better illuminated without glare of other road users and obstacles can be detected earlier than conventional low beam.
황보영(Bo-Young Hwang),이혁민(Hyuk-Min Lee),박인흠(Inheum Park) 한국자동차공학회 2012 한국자동차공학회 학술대회 및 전시회 Vol.2012 No.11
Automotive light guides have been used to express the unique identity of car makers through improvement of the design degrees of freedom and cost savings can be achieved by distributing light over a wide area using small number of light sources by light guide optical system. The objective of this study is to optimize light guide design conditions using DFSS (Design For Six Sigma) methods for luminance uniformity of automotive light guides. By using DFSS methods, major design factors are selected and optimized design conditions of them are decided. Also, the evaluation method of luminance uniformity is established by analyzing light guide products actually applied to the mass production of vehicles. The feasibility is demonstrated with the optical simulation. By applying these conditions to design light guides, the design time is greatly reduced and the luminance uniformity is substantially improved.
야간 보행자 사고예방을 위한 Spot 조명 시스템의 연구
방명극(Myung-Gug Bang),이혁민(Hyuk-Min Lee),이현수(Hyunsoo Lee),이홍석(Hongsuk Lee),안병석(Byoungsuk Ahn),박인흠(Inheum Park) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
Most pedestrian accidents occur when the pedestrian crosses the road at night. In order to reduce the pedestrian accidents, presence of the pedestrian should be informed to a driver. Therefore, the lighting system which supporting the driver to recognize the pedestrians on the road in advance is needed to reduce the pedestrian accidents. There is the ‘Night Vision System’ already being applied to prevent accidents with pedestrians in high-end vehicles. The current system uses Far-Infrared(FIR) and Near-Infrared(NIR) theory to detect pedestrians shows the object through the monitor or cluster but this can be dangerous because the driver would have to look at two different areas, straight forwards at the road and monitor simultaneously. We have developed a system where the driver would not have to disperse his sight and could be alerted of the presence of the pedestrian by the system that brings attention on the object automatically. We have decided to name this system “Spot Light System”. In this study, we developed the spot light system that notifies the driver of pedestrian on the road. Near-Infrared(NIR) sensor and irradiation equipment achieve the image ahead of the vehicle. After the image processing work, a headlamp Electronic Control Unit(ECU) detects a located pedestrian and operates the spot lamp to illuminate the detected pedestrian.