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계층구조적 분류모델을 이용한 심전도에서의 비정상 비트 검출
이도훈,조백환,박관수,송수화,이종실,지영준,김인영,김선일,Lee, Do-Hoon,Cho, Baek-Hwan,Park, Kwan-Soo,Song, Soo-Hwa,Lee, Jong-Shill,Chee, Young-Joon,Kim, In-Young,Kim, Sun-Il 대한의용생체공학회 2008 의공학회지 Vol.29 No.6
The more people use ambulatory electrocardiogram(ECG) for arrhythmia detection, the more researchers report the automatic classification algorithms. Most of the previous studies don't consider the un-balanced data distribution. Even in patients, there are much more normal beats than abnormal beats among the data from 24 hours. To solve this problem, the hierarchical classification using 21 features was adopted for arrhythmia abnormal beat detection. The features include R-R intervals and data to describe the morphology of the wave. To validate the algorithm, 44 non-pacemaker recordings from physionet were used. The hierarchical classification model with 2 stages on domain knowledge was constructed. Using our suggested method, we could improve the performance in abnormal beat classification from the conventional multi-class classification method. In conclusion, the domain knowledge based hierarchical classification is useful to the ECG beat classification with unbalanced data distribution.
도서지역 굴토끼(Oryctolagus cuniculus) 침입에 따른 피해와 관리
이도훈,최철현,김영채,장갑수,이창우,Lee, Do-Hun,Choi, Chul-Hyun,Kim, Young-Chae,Jang, Gab-sue,Lee, Changwoo 한국환경영향평가학회 2017 환경영향평가 Vol.26 No.5
본 연구는 도서지역에 침입한 굴토끼(Oryctolagus cuniculus)의 서식양상과 섭식 영향을 밝혀 효과적인 관리에 필요한 기초자료를 제공하고자 수행되었다. 조사 대상지인 범섬과 까막섬은 도입식물의 식재, 답압, 경작활동 등 인위적 간섭에 의해 교란된 이차식생 유형이다. 범섬에 정착한 굴토끼는 벌채지를 중심으로 높은 흔적밀도를 보였고, 까막섬에 정착한 굴토끼는 낙엽활엽수림대를 중심으로 높은 흔적밀도를 나타내었다. 조사지역에서 확인된 굴토끼 섭식 가해 식물은 총 12과 17분류군으로 확인되었다. 범섬에서는 총 9과 11분류군의 섭식 가해 식물이 확인되었고, 먹이 가용 식물이 대부분 소실된 까막섬에서는 총 5과 6분류군의 섭식 가해 식물이 확인되었다. 범섬의 식생지수는 도서 전체 면적의 약 6.6% 감소하였고, 까막섬의 식생지수는 전체 도서지역에서 감소하였다. 까막섬은 Enhanced Vegetation Index가 -0.008unit/yr 이상 감소하는 지역이 전체의 5.2%였으며, -0.008~-0.006unit/yr으로 감소하는 지역은 전체의 13.32%로 확인되어 심각한 식생 교란과 생물다양성 손실이 예상되므로 도서생태계의 보전과 복원을 위한 즉각적인 관리가 필요하다. The aim of this study is to examine the damage of plants in the islands due to the habitat and feeding of European rabbit (Oryctolagus cuniculus) and to suggest future management plan. The survey area Beomseom Island is found to be a vegetation distribution type that was formed secondary by the exposure of artificial interference except for evergreen vegetation distribution and European rabbit showed high habitat track density mainly in the lumbering area. Kkamakseom Island was identified as a severe vegetation distribution area due to interference, and European rabbit showed high habitat track density around deciduous broad leaved forests. Feeding plants of European rabbit was identified as a total of 12 families 17 breeds. Total 9 families 11 breeds were found in Beomseom Island while 5 families 6 breeds were found in Kkamakseom where most available food resources were loss to European rabbit. As for vegetation index of Beomseom Island, about 6.6% of total island area was declined and the vegetation index of Kkamakseom Island was reduced at most area of the island. In Kkamakseom Island, the area where EVI decreased to less than -0.008 unit/yr was reduced to 5.2%, and the area where it was reduced to -0.008 to -0.006 unit/yr in total was 13.32% of the total area. Thus, it was estimated to be seriously damaged by vegetation. Therefore, immediate management is required.
25.8㎸급 친환경 고체절연차단기(Solid Insulated Switchgear)에 대한 기계적 신뢰성(수명) 평가
이도훈(Do-Hoon Lee),이석원(Seog-Won Lee),박석원(Seok-Weon Park),김영근(Young-Geun Kim),이종호(Jhong-Ho Lee) 대한전기학회 2010 전기학회논문지 P Vol.59 No.2
In this paper, mechanical reliability(Life-time) estimation method for 25.8kV SIS(Solid Insulated Switchgear) has been studied. Recently enacted KEPCO's standard includes clause that have to submit a warrantable reliability data for life-time(over B10 25 years) of an epoxy-solid insulating material. Accordingly, this research was carried out on the ALT(Accelerated Life Test) and Life-Estimation method for SIS's insulating material. Mechanical life-time estimation for SIS's insulating material is to verify reliability for tensile creep & fatigue stress, which is the major mechanical stress of SIS. This study proved that SIS's reliability for mechanical stress and established that confidence for estimation results in further verification test.
25.8㎸ 고체절연차단기(Solid Insulated Switchgear)에 대한 기계적 신뢰성(수명) 평가
이도훈(Do-Hoon Lee),강원종(Won-Jong Kang),이석원(Seog-Won Lee),신철호(Chul-Ho Shin),김영근(Young-Geun Kim),이규철(Kyu-Chul Lee),이승엽(Seung-Yeup Lee),김호근(Ho-Keun Kim) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.7
본 논문은 SF? 가스졀연차단기를 대체할 고체절연차단기 (Solid Insulated Switchgear:SIS)의 기계적 신뢰성 평가에 대한 연구 결과이다. 최근 제정된 “25.8㎸ 가스 및 고체절연 친환경 개폐장치” 한전 구매규격에는 “Epoxy 고체절연물에 대한 기계적 신뢰성(수명)이 25년 이상”임을 보증할 수 있는 신뢰성 데이터를 제출해야 한다는 조항이 포함되어있다. 이에 개발된 고제절연차단기의 Epoxy 고체절연물에 대한 기계적 신뢰성(수명)이 25년 이상임을 보증할 수 있는 신뢰성 시험과 분석 기법에 대한 연구가 진행되었다.
GPS 기반 가상차선 구축을 통한 고신뢰성 ADB 실차 시험기법 개발
이도훈(Dohoon Lee),이동현(Donghyeon Lee),김건용(Geonyoung Kim),최문주(Moonjoo Choi),김태형(Tae-hyoung Kim),이태희(Taehee Lee) 한국자동차공학회 2023 한국자동차공학회 부문종합 학술대회 Vol.2023 No.5
Adaptive Driving Beam is an automobile’s lighting system which could coordinate strongness and direction depending on driving conditions and it was announced in 2022 at NHTSA to evaluate ADB capability quantitatively as a test protocol. To proceed the test as the order of ADB test protocol curve test road marked with lane of test scenario is needed. However there was a problem of low credibility and repeatability because a driver should drive after checking the lane with his(her) naked eyes. This problem was found through the data analysis of IIHS test which is similar with ADB. To solve this problem this paper proposes a test method which could increase credibility and repeatability about the result of ADB test through an accurate course traveling based on imaginary lane by using a GPS sensor and a steering robot. As a result of applying the proposed test method, the fact that the curve driving is possible without constructing any lane of test site was found and the test credibility and repeatability could be checked through the course error and standard deviation.