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심박간격의 마코프 국면전환 모형화를 통한 심방세동 탐지
정용한(Yonghan Jung),김희영(Heeyoung Kim) 대한산업공학회 2016 대한산업공학회지 Vol.42 No.5
This paper proposes a new method for the automatic detection of atrial fibrillation (AF), using Markov regime switching GARCH (1, 1) model. The proposed method is based on the observation that variability patterns of heart rate intervals during AF significantly differ from regular patterns. The proposed method captures the different patterns of heart rate intervals between two regimes : normal and AF states. We test the proposed method using Massachusetts Institute of Technology-Beth Israel Hospital (MIT-BIH) atrial fibrillation database, and demonstrate the effectiveness of the proposed method.
조사로봇의 재난현장 활용을 위한 다중센서모듈 개발 및 성능평가에 관한 연구
정용한,홍준우,한수희,신동윤,임언택,김성삼,Jung, Yonghan,Hong, Junwooh,Han, Soohee,Shin, Dongyoon,Lim, Eontaek,Kim, Seongsam 대한원격탐사학회 2022 大韓遠隔探査學會誌 Vol.38 No.6
Disasters that occur unexpectedly are difficult to predict. In addition, the scale and damage are increasing compared to the past. Sometimes one disaster can develop into another disaster. Among the four stages of disaster management, search and rescue are carried out in the response stage when an emergency occurs. Therefore, personnel such as firefighters who are put into the scene are put in at a lot of risk. In this respect, in the initial response process at the disaster site, robots are a technology with high potential to reduce damage to human life and property. In addition, Light Detection And Ranging (LiDAR) can acquire a relatively wide range of 3D information using a laser. Due to its high accuracy and precision, it is a very useful sensor when considering the characteristics of a disaster site. Therefore, in this study, development and experiments were conducted so that the robot could perform real-time monitoring at the disaster site. Multi-sensor module was developed by combining LiDAR, Inertial Measurement Unit (IMU) sensor, and computing board. Then, this module was mounted on the robot, and a customized Simultaneous Localization and Mapping (SLAM) algorithm was developed. A method for stably mounting a multi-sensor module to a robot to maintain optimal accuracy at disaster sites was studied. And to check the performance of the module, SLAM was tested inside the disaster building, and various SLAM algorithms and distance comparisons were performed. As a result, PackSLAM developed in this study showed lower error compared to other algorithms, showing the possibility of application in disaster sites. In the future, in order to further enhance usability at disaster sites, various experiments will be conducted by establishing a rough terrain environment with many obstacles.
정용한,임언택,석재욱,구슬,김성삼,Yonghan Jung,Eontaek Lim,Jaewook Suk,Seul Koo,Seongsam Kim 대한원격탐사학회 2023 大韓遠隔探査學會誌 Vol.39 No.5
Investigating disaster sites such as earthquakes and landslides involves significant risks due to potential secondary disasters like facility collapse. In situations where direct access is challenging, there is a need to develop methods for safely acquiring high-precision 3D disaster information using light detection and ranging (LiDAR) equipped drone survey systems. In this study, the feasibility of using drone LiDAR in disaster scenarios was examined, focusing on the collapse accident at Jeongja Bridge in Bundang-gu, Seongnam City, in April 2023. High-density point clouds for the accident bridge were collected, and the bridge's 3D terrain information was reconstructed and compared to the measurement performance of 10 ground control points. The results showed horizontal and vertical root mean square error values of 0.032 m and 0.055 m, respectively. Additionally, when compared to a point cloud generated using ground LiDAR for the same target area, a vertical difference of approximately 0.08 m was observed, but overall shapes showed minimal discrepancies. Moreover, in terms of overall data acquisition and processing time, drone LiDAR was found to be more efficient than ground LiDAR. Therefore, the use of drone LiDAR in disaster sites with significant risks allows for safe and rapid onsite investigations.
드론센싱자료와 식생지수를 활용한 환경피해범위 산출 정확도 평가
임언택,정용한,김성삼,Eontaek Lim,Yonghan Jung,Seongsam Kim 대한원격탐사학회 2023 大韓遠隔探査學會誌 Vol.39 No.5
In this study, we explored a method for assessing the extent of damage caused by chemical substances at an accident site through the use of a vegetation index. Data collection involved the deployment of two different drone types, and the damaged area was determined using photogrammetry technology from the 3D point cloud data. To create a vegetation index image, we utilized spectral band data from a multi-spectral sensor to generate an orthoimage. Subsequently, we conducted statistical analyses of the accident site with respect to the damaged area using a predefined threshold value. The Kappa values for the vegetation index, based on the near-infrared band and the green band, were found to be 0.79 and 0.76, respectively. These results suggest that the vegetation index-based approach for analyzing damage areas can be effectively applied in investigations of chemical accidents.
화학물질사고 피해영역 산출을 위한 드론맵핑 기반의 정규식생지수 활용방안 연구
임언택,정용한,김성삼,Lim, Eontaek,Jung, Yonghan,Kim, Seongsam 대한원격탐사학회 2022 大韓遠隔探査學會誌 Vol.38 No.6
The annual increase in chemical accidents is causing damage to life and the environment due to the spread and residual of substances. Environmental damage investigation is more difficult to determine the geographical scope and timing than human damage investigation. Considering the reality that there is a lack of professional investigation personnel, it is urgent to develop an efficient quantitative evaluation method. In order to improve this situation, this paper conducted a chemical accidents investigation using unmanned aerial vehicles(UAV) equipped with various sensors. The damaged area was calculated by Ortho-image and strength of agreement was calculated using the normalized difference vegetation index image. As a result, the Cohen's Kappa coefficient was 0.649 (threshold 0.7). However, there is a limitation in that analysis has been performed based on the pixel of the normalized difference vegetation index. Therefore, there is a need for a chemical accident investigation plan that overcomes the limitations.
배규한(Gyuhan Bae),정용한(Yonghan Jung),유환희(Hwanhee Yoo) 대한공간정보학회 2015 한국지형공간정보학회 학술대회 Vol.2015 No.9
본 연구는 경상남도 진주시의 화재 발생의 추이를 분석하기 위하여 진주소방서와 국가화재 정보시스템에서 2007년부터 2014년까지 화재발생데이터를 수집하여 연구를 진행하였다. 진주시는 경남 서부권에 위치하고 있으며 대상기간 내 발생한 30,086건의 화재 중 2,441건의 화재가 발생하여 경상남도 20개 시, 군, 구 중 3순위에 기록 되고 있으며 화재의 위험이 높은 것으로 나타났다. 이에 본 연구에서는 대상지의 2007년부터 2014년까지 화재발생데이터를 바탕으로 화재발생 관련 각종 정보와 위치정보를 연계하여 트렌드 분석을 하여 화재피해저감 대책 수립에 활용될 수 있는 방안을 마련하는데 활용되고자 한다.
박진관(ChenKwan Park),정홍도(HongDo Jung),신용한(YongHan Shin),정효민(HyoMin Jeong),정한식(HanShik Chung) 대한설비공학회 2010 대한설비공학회 학술발표대회논문집 Vol.2010 No.11
According to the KEMCO(Korea Energy Management Corporation) reports that the university facilities account for the majority of wasted energy in the domestic building. The reason that a lot of energy to use in university facilities is the university facilities have to use in a lot of energy because of structural problems. More than all, but, the members of the university lack the awareness of energy conservation. Thus, in this paper we focus a discussion on the cases of wasted energy and the methods of energy conservation.
지열 현장 시공 사례 및 경제성 분석에 관한 연구 (PP.463-466)
박진관(ChenKwan Park),정홍도(HongDo Jung),신용한(YongHan Shin),정효민(HyoMin Jeong),정한식(HanShik Chung) 대한설비공학회 2011 대한설비공학회 학술발표대회논문집 Vol.2011 No.7
Renewable energy is growing based on low-carbon green energy Government policies. According to this policy, geothermal energy is highly efficient and environmentally friendly energy which is being expanded nowadays. However, construction companies are generated disorderly but their ability has not been verified due to the poor geothermal facility which was reported in the media. In the process of introducing on Busan region's largest geothermal facility, it was confirmed that thermal efficiency of the underground is close to heat exchanger performance. Therefore the study improving the efficiency of underground heat exchange found progressed. The results showed voids between Borehole and Ground Heat Exchanger should not be raised. And then geothermal facilities were installed very successfully through the principle grouting operation. As compared to the energy consumption on the basis of operating results energy usage was less than any other heat sources.