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이현수,노재선,정진화,장원철,Lee, Hyunsoo,Roh, Jaesun,Jung, Jin Hwa,Jang, Woncheol 한국통계학회 2016 응용통계연구 Vol.29 No.3
귀농인구의 증가는 빠르게 고령화되고 있는 한국농촌에서 경제 활성화의 단초로 주목받고 있다. 본 논문에서는 2013년 귀농귀촌인 통계를 바탕으로 네트워크 방법을 사용해 귀농인구의 이동에 대한 분석을 진행한다. 구체적으로 다양한 네트워크 중심도지표를 사용해 주요 귀농 거점지역을 파악하고 통계적 네트워크 모형을 사용해 귀농인구의 이동에 존재하는 경향을 살펴본다. 또한 latant distance model을 이용하여 거리가 귀농인구 이동에 미치는 영향에 대해 알아본다. Urban-to-rural migration for farming has recently emerged as a new way to vitalize rural economies in a fast-aging rural Korea. In this paper, we analyze the 2013 data of returning farmers with statistical network methods. We identify urban to rural migration hubs with centrality measures and find migration trends based on regional clusters with similar features via statistical network models. We also fit a latent distance model to investigate the role of distance in migration.
고령자 행위 패턴 기반 욕실의 지능형 서비스 패턴 개발
이현수(Lee, HyunSoo),정지예(Jung, Ji Yea),박성준(Park, Sung Jun) 한국실내디자인학회 2013 한국실내디자인학회논문집 Vol.22 No.1
A bathroom in house has been stressed not only as a space for physiology and hygiene but also leisure and healthcare. However, the bathroom is the most likely space where an elderly person can have an accident and it is uncomfortable space for them because of their deteriorating physical ability. So the purpose of this study is to help the elderly use their bathroom conveniently by providing smart service. Therefore, we carry out 18 smart service patterns that contain assistive devices and sensors for bathroom. Considering applicability and frequency, from among these service patterns, we suggest 4 service patterns. First is a fall prevention service. This service helps elderly use the bathroom safely at night. Second is a getting ready to go out service. This service helps the situation that elderly use the bathroom after getting up in the morning. Third is a security service in daily life especially before or after meals. And final is a service regarding personal hygiene service after returning home. This service helps to shower or bathe after return home. These services have positive influence in medical expense reductions, good health care and self-reliance of elderly.
도심 엔터테인먼트 쇼핑센터(UEC)의 테넌트 배치 형태에 관한 연구
이현수(Lee, Hyunsoo),오정아(Oh, Jung-Ah) 한국실내디자인학회 2012 한국실내디자인학회논문집 Vol.21 No.6
The purpose of this study is to analyze the pattern of tenant layout for selected cases of five different Urban Entertainment Center(UEC) in Seoul. This research deals with the process of gaining tenant layout pattern of 40 different types. It is composed of three combination unit with tenants of the same or different consumption mode, which is divided into four different functions of retail, entertainment, dining, and service. Then, every tenant of research cases is classified as one of the fabric type, and the data is analyzed to gain its frequency rate with SPSS 14.0 program. The following is the overall explanation of the result for this research. The frequency of tenant layout pattern between the same consumption mode shows the high rate when compared to the other patterns with different consumption mode. For example, the frequency rate of tenant layout pattern which retail and dining consumption mode are placed side by side like RRR and DDD is high. Interestingly, the frequency rate of RRR type of tenant layout pattern that sells the similar products shows especially high level. It can provide the effective environment for shoppers to compare retail goods in many different stores as producing synergic effects when they are located near each other, so this strategy should be considered when planning tenants in UEC environment. Moreover, in case of dining tenants, when they are clustered together in the UEC environment it can play a role as an anchor tenant. Tenant layout pattern of dining-retail and dining-service consumption mode shows the high frequency rate than other layout pattern with other consumption mode. Besides, entertainment consumption tenants combined with dining or retail tenants show the high frequency rate when compared to the pattern combined with service consumption mode.
MLFMM의 Transfer 함수의 정확한 계산을 위한 오버샘플링 비율
이현수(Hyunsoo Lee),임재원(Jae-Won Rim),고일석(Il-Suek Koh) 한국전자파학회 2018 한국전자파학회논문지 Vol.29 No.10
MLFMM 알고리듬을 큰 산란체 문제에 적용하는 경우, transfer 함수의 계산이 최종 결과의 정확도에 큰 영향을 준다. 수치 과정 중 단위원 위에서 계산되는 적분의 정확도는 샘플링 수에 영향을 크게 받는다. 샘플링 수를 늘리면, 메모리와 계산시간도 같이 늘어나, 정확도가 유지되는 최소의 샘플링 수가 중요하다. 이는 산란체의 크기와 관련이 있어, 수치적으로 최적의 샘플링 수에 관한 오버샘플링 비율을 구하고, 대규모 산란체에서 검증한다. When applying the MLFMM algorithm to a large scattering problem, the accuracy of the calculation of the transfer function has a crucial effect on the final simulation results. The numerical accuracy for the double integral on the unit sphere is strongly dependent on the sampling number. With an increasing the sampling points, the overall required memory and running time of the MLFMM simulation also increases. Hence, an optimal over-sampling rate for the number of the sampling points is numerically obtained, which is verified for a real large scattering problem.
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.