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Multi-mode Kernel Weight-based Object Tracking
Eun-Sub Kim(김은섭),Yong-Goo Kim(김용구),Yoo-Joo Choi(최유주) 한국컴퓨터그래픽스학회 2015 컴퓨터그래픽스학회논문지 Vol.21 No.4
최근, 감시시스템, 게임, 영화 등 다양한 분야에서 영상을 이용한 실시간 객체 추적의 필요성이 높아짐에 따라, 커널기반 mean-shift 추적 기법에 대한 관심이 높아지고 있다. 커널 기반 mean-shift 객체 추적에 있어서 주요한 몇 가지 문제점들 중, 첫 번째로 추적 목표 객체에 대한 부분 가림 혹은 전체 가림 상황에서의 객체 추적의 문제를 들 수 있다. 본 논문에서는 멀티모드 지역적 커널 가중치를 적용함으로써 부분 가림 상황에서도 안정적으로 객체를 추적할 수 있는 실시간 mean-shift 추적 기법을 제안한다. 제안기법에서는 단일 커널을 사용하는 대신 여러 개의 서브 커널들로 구성된 커널을 사용하고, 각 서브 커널의 위치에 따른 지역적 커널 가중치를 적용한다. 기존의 멀티모드 커널 기반의 방법과 비교한 실험을 통하여 본 제안 방법이 보다 안정적으로 객체를 추적할 수 있음을 보였다. As the needs of real-time visual object tracking are increasing in various kinds of application fields such as surveillance, entertainment, etc., kernel-based mean-shift tracking has received more interests. One of major issues in kernel-based mean-shift tracking is to be robust under partial or full occlusion status. This paper presents a real-time mean-shift tracking which is robust in partial occlusion by applying multi-mode local kernel weight. In the proposed method, a kernel is divided into multiple sub-kernels and each sub-kernel has a kernel weight to be determined according to the location of the sub-kernel. The experimental results show that the proposed method is more stable than the previous methods with multi-mode kernels in partial occlusion circumstance.
관수조절에 의한 벽면녹화의 냉각효과 분석 연구 - 아이비, 수호초를 식재한 모듈형 벽면녹화를 중심으로-
김은섭 ( Kim Eun-sub ),윤석환 ( Yun Seok-hwan ),박정강 ( Piao Zheng-gang ),전윤호 ( Jeon Yoon-ho ),강혜원 ( Kang Hye-won ),김상혁 ( Kim Sang-hyuck ),김지연 ( Kim Ji-yeon ),이용구 ( Lee Young-gu ),이동근 ( Lee Dong-kun ) 한국환경복원기술학회 2021 한국환경복원기술학회지 Vol.24 No.6
Green facade has a significant impact on building’s energy performance by controlling the absorption of solar radiation and improving outdoor thermal comfort through shading and evapotranspiration. In particular, since high-density building does not enough green space, green facade, and rooftop greening using artificial ground plants are highly utilized. However, the level of cooling effect according to plant traits and irrigation control is different. Therefore, in this study, the cooling effect analyzed for a total of 4 cases by controlling the irrigation condition based on hedera and spurge. Although hedera under sufficient water had the highest cooling effect(-2℃~-4℃), had the lowest cooling effect under non-irrigation(+1.1℃~+4.4℃). In addition, hedera under sufficient water had cooling effect than hedera under non-irrigation(-1℃~-8.1℃) and in the case of spurge, it had cooling effect(-0.3℃~-7.8℃) more than non-irrigation. As a result of measuring the amount of transpiration according to the light intensity (PAR) and carbon dioxide concentration conditions, transpiration of hedera was higher than the spurge (respectively 0.63204mmolm<sup>-2</sup>s<sup>-1</sup>, 0.674367mmolm<sup>-2</sup>s<sup>-1</sup>). The difference in the cooling effect of the green facade under irrigation condition was significant. But the potential cooling effect of green facade according to plants species was different. Therefore, in order to maximize and continuously provide the cooling effect of green facade in urban areas, it is necessary to consider the characteristics of plants and the control of water supply through the irrigation system.
빗물 저류 시스템을 활용한 옥상 녹화의 온도 저감 효과
윤석환 ( Yun Seok-hwan ),김은섭 ( Kim Eun-sub ),박정강 ( Piao Zheng-gang ),전윤호 ( J Eon Yoon-ho ),강혜원 ( Kang Hye-won ),김상혁 ( Kim Sang-hyuck ),김지연 ( Kim J I-yeon ),강한민 ( Kang Han-min ),함은경 ( Ham Eun-kyung ),이동근 한국환경복원기술학회 2021 한국환경복원기술학회지 Vol.24 No.6
Thermal environment of city is getting worse due to severe urban heat island caused by climate change and urbanization. Green roof improves the urban thermal environment and save the cooling energy in buildings. This study presented a green roof combined with a storage system that stores rainwater and supplies water through a wick and evaluated the temperature reduction effect as surface temperature and amount of evapotranspiration. For about a week, the surface temperature using a infrared thermal imager and the evapotranspiration by recording change of module weight were measured at intervals of 30 minutes from sunrise to sunset. The results show that the mean surface temperature of the green roof was 15.4 degrees lower than that of the non-green roof from 12:00 P.M. to 14:00 P.M. There was no significant difference between mean surface temperature of green roof with and without storage system immediately after rain, but more than a week after rain, there was a difference with average of 2.49 degrees and maximum of 4.72 degrees. The difference in daily amount of evapotranspiration was measured to be 1.66 times on average. As drought stress increased over time, the difference in daily amount of evapotranspiration and surface temperature between with/without storage system increased simultaneously. The results of the study show a more excellent cooling effect of green roof combined with the rainwater storage system.
나종화(Jonghwa Na),김은섭(Eun-Sub Kim) 한국산업정보학회 2013 한국산업정보학회논문지 Vol.18 No.6
소셜 미디어 정보는 실시간으로 가장 최신의 정보의 획득을 가능하게 하며, 확산 속도가 빠르고 형태의 제약 없이 유연하게 생산 및 유통할 수 있다는 강점이 있으며, 최근 경제변수들의 예측에 있어서 소셜 미디어 정보를 이용한 예측의 활용 방안에 대한 논의가 활발히 이루어지고 있다. 본 논문에서는 실업률을 예측함에 있어 소셜 미디어 정보 유형 중 하나인 Google Index 정보를 이용하여 시계열 모형 중 하나인 ARIMAX 모형과 ECM 모형을 적합하였고, 모형의 예측력을 비교하기 위해 기존의 ARIMA 모형과의 비교를 수행하였다. 또한, 소셜 미디어 정보 이용에 있어 Google Index 뿐만 아니라 국내 소셜 미디어 정보인 News Index와의 결합을 통해 예측력의 제고 가능성을 확인하였다. 본 연구에서 다루어진 분석 절차와 통계적 모형의 적합 과정은 실업률 외의 주요 사회, 경제지표에도 적용될 수 있다. Social media has many advantages. It can gain latest information with real time, be spread rapidly, easily be reproduced and distributed regardless of its form. These advantages can result in real time predictions using the latest information, which is possible due to the increase in social demand for more quick and accurate economic variable predictions. In this paper we adopted ARIMAX and ECM model to predict the unemployment rate and as a social information we used the Google Index provided by Google Trend. Also we used News Index as a domestic social information. The process of fitting statistical model considered in this paper can be adopted to predict various socio/economic indices as well as unemployment rate.
서영교(YOUNG-KYO SEO),강효섭(HYO-SUB KANG),김은섭(EUN-SUB KIM) 한국해양공학회 2008 韓國海洋工學會誌 Vol.22 No.2
Recently many countries have became interested in the development of cold or arctic regions. The construction of engineered structures in those regions demands an understanding of the deformation characteristics of frozen soil. However, an understanding of frozen soil behavior poses difficult problems owing to the complex interaction between the soil particles and the ice matrix. In this research, a series of laboratory tests was performed to investigate the variations in the unconfined compression strength and split tensile strength of weathered granite soil and mixed soil (standard sand and kaolinite) in 15 degrees below zero environments. In the frozen soil tests, specimens were prepared with various water and clay contents, and then the interrelationships between four factors (water content, clay content, unconfined compression strength, split tensile strength) were analyzed. The test results were summarized as follows; as the water content was increased, the unconfined compressive and split tensile strengths also increased in frozen soil. However as the clay content was increased, the unconfined compressive and split tensile strengths were lowered. In the case of frozen soil that contained little clay content, the strength decreased rapidly in mixed soil (standard sand and kaolinite) when th£ frozen specimen was broken. On the other hand, in the cases of mixed soil that contained a high clay content and weathered granite soil, the strength decreased relatively slowly.