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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.
ADB(Adaptive Driving Beam) 시스템 라인업 개발
이현수(Hyunsoo Lee),원용희(Yonghee Won),송기룡(Giryong Song),한성연(Sungyeon Han),이혁민(Hyukmin Lee) 한국자동차공학회 2017 한국자동차공학회 학술대회 및 전시회 Vol.2017 No.11
The economic matrix beam is needed on the market. In this study, Bi-Function matrix module is suggested to meet the needs. The study is carried out by approaching the minimizing size and the enhancing performance of the matrix headlamp including low beam and high beam. To find the solution, the study defined the target of the development and verified concepts of some optical modules which can meet the target. After that, I fixed the optical concept to realize the performance what we want. The optic and structure are designed and simulated by CATIA, SPEOS and Light tools. During the design, there are many kinds of problems. For example, Pattern gap between the low beam and high beam, structural and optical limitation of the optic, Color aberration, Material, Tolerance, Operation logic and so on. The study shows that all the solution what I approached to overcome side effects to meet the target performance. Those are not perfect solutions. And also one of them might be not a real solution on the market. But the study was trying to discuss all in terms of the solution. Finally, real mock-up module was made and tested by LMT machine. The light distribution was almost same as what I simulated. And it works well following the virtual logic which is designed by assuming certain driving condition. Unfortunately, the study could not include the result of real car testing about the matrix beam. It will be a next step of this study. At the end of thesis, I suggested the new technology for the future briefly. In the future, Autonomous cars are expected on the market mainly. The role of headlamp should be change to meet the new requirements of future market needs.
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.
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.
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.
Performance Comparison of Five SARS-CoV-2 Antibody Assays for Seroprevalence Studies
Park Younhee,Hong Ki Ho,Lee Su-Kyung,Hyun Jungwon,Oh Eun-Jee,Lee Jaehyeon,이혁민,Song Sang Hoon,Kee Seung-Jung,Kwon Gye Cheol,Kim Su Hwan,Do Hyeon-Nam,Kim Ah-Ra,Lee June-Woo,Kim Sung Soon,Kim Hyun Soo 대한진단검사의학회 2022 Annals of Laboratory Medicine Vol.42 No.1
Background: Seroprevalence studies of coronavirus disease 2019 (COVID-19) cases, including asymptomatic and past infections, are important to estimate the scale of the disease outbreak and to establish quarantine measures. We evaluated the clinical performance of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) antibody assays available in Korea for use in seroprevalence studies. Methods: The sensitivity, specificity, cross-reactivity, and interference of five SARS-CoV-2 antibody assays were evaluated using the following: 398 serum samples from confirmed COVID-19 patients, 510 negative control samples from before 2018 (pre-pandemic), 163 serum samples from patients with SARS, Middle East respiratory syndrome (MERS), and other viral infections, and five samples for the interference study. Results: The sensitivities of the five assays ranged from 92.2% to 98%, and their specificities, including cross-reactivity and interference, ranged from 97.5% to 100%. The agreement rates were excellent (kappa >0.9). Adjustment of the cutoff values could be considered through ROC curve analysis. The positive predictive values of the individual assays varied from 3.5% to 100% at a 0.1% prevalence but were as high as ≥95% when two assays were combined. Conclusions: The prevalence of COVID-19 in Korea is considered to be exceptionally low at present; thus, we recommend using a combination of two or more SARS-CoV-2 antibody assays rather than a single assay. These results could help select SARS-CoV-2 antibody assays for COVID-19 seroprevalence studies in Korea.