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교통안전과 운저자의 주의력 감쇠 측정 : 문제제시와 응용
이상국,부누와 드꾸,미셸 위뱅,홀랑 드브리 경북대학교 센서기술연구소 1995 센서技術學術大會論文集 Vol.6 No.1
Driving a car is a complex task that requires the driver to maintain attention for long periods of time. Either a lack of attention or a performance decrement may have severe consequences, especially if the driver has to react promptly to an unexpected event. The most recent report of traffic accident shows that more than half of the victims of the road could not be saved by the the one consideration of passive protection taking on the vehicles, of Where the interest of our research on the driver's state through different aspects : physiological, mechanical, behavioural, dynamic etc. A real-time detection system is needed that must be predictive, in order to warn the driver that his status has changed before any fault occurs. Fatigue and hypovigilance at the wheel are major causes of car accidents Hypovigilance is a physiological state that can be mesured on physiological signals such as Electro-encephalogram (EEG) or Electro-oculogram (EOG). Despite numerouse studies carried out in this field, no constant correlation has been found so far between physiological signs of hypovigilance and changes in the driving activity. Our pratical ambition in this domain is the realization of real-time detector of hypovigilance of drivers. This realization is still in a stage of seeks some best indicators, woule certainly make call to data processing engineering, to automatic, to image/signal treatement during and after the phase of validation. A global approach of the vigilance of the drivers would be primordial in the next years.
박선국,이상관,최부귀 동아대학교 공과대학 부설 한국자원개발연구소 1990 硏究報告 Vol.14 No.2
A multi-fan hovering mechanism is investigated as a vehicle for field work at a mountainous resion. This paper presents its control characteristics in level ground proximity. The motion is formulated considering ground effect. A controller stable for the change of property with height is presented The experimental results obtained using a scale model are presented. It is shown that the controller works properly, problems are made clear to improve the hovering charactistics.
강호종,채윤석,이상우,문국이 진주산업대학교 농업기술연구소 2007 農業技術硏究所報 Vol.20 No.-
수박종자의 크기에 따른 발아율과 배축 굵기, 뿌리발육상태, 접목묘 생육 및 과실 품질에 미치는 영향에 대한 연구결과를 요약하면 다음과 같다. 1. 종자 크기별 발아율은 대립은 97%, 중립은 94%, 소립은 91.9%로 종자의 중량이 큰 대립종자 일수록 발아율이 높았다. 2. 종자의 크기별 배축 굵기는 대립이 1.63mm, 중립이 1.45mm, 소립이 1.29mm로 종자의 중량이 클수록 배축이 굵고 뿌리무게도 무거운 것으로 나타났다. 3. 종자의 크기별 접수의 소질은 종자의 중량이 큰 것일수록 좋은 경향이 있었으나 초장, 엽장 등은 소립종자에서 유의적인 경향이 나타났다. 4. 종자의 크기별 접목묘 소질은 대립종자에서 유의적인 차이를 보였고, 뿌리중량은 중립종자에서 다소 높은 경향이었으나 통계적 유의성은 인정되지 않았다. 5. 종자 크기별 착과 절위별로 과중은 자만 7~8절에서 6.6kg, 자만 9~ 10절에서 7.4kg, 자만 11~13절에서 7.2kg으로 자만 9~10절에 착과시킨 처리구가 가장 좋았다. 6. 접목융합의 정도에 따라 생육과 과실의 품질에 유의성이 있었다. 7. 종자의 크기가 클수록 발아율과 배축 굵기, 균일도 등이 높아 접목작업이 용이하여 접목능률을 향상시켰다. Effects of seeds size(small, medium and large) in watermelon(citrulus vulgaris schard) on seed germination, seedlings growth and the quality of fruit were investigated. The results are as followings. The seeds of watermelon were classified according to the weight of seeds into 3 groups, small (〈34mg), medium(44-35mg) and large( 〉45mg). Germination rate increased from 91.9% to 97% as the seed size increased. Hypocotyle thickness increased from 1.1mm to 1.5mm as the size of seeds increased. The heavier root weight was the larger the seeds were. The quality of seedlings improved as the seed size increased. Fruit quality was better at larger seed. At the same time, the efficiency of grafting improved since larger seeds produced higher uniformity at germination rate and hypocotyl thickness. The fruit weight was 6.6kg at 7-8 node, 7.4kg at 9-10kg and 7.2kg at 11-13kg.
이성국(Sung-Goog Lee),이지형(Jee-Hyong Lee) 한국지능시스템학회 2005 한국지능시스템학회 학술발표 논문집 Vol.15 No.1
시멘틱웹이란 컴퓨터가 정보의 의미를 이해하고 그 의미를 조작 할 수 있는 웹으로서 기존의 웹으로는 불가능했던 데이터의 자동처리를 가능하게 하는 차세대 웹 기술을 말한다. 이러한 웹을 위해서는 표준화된 데이터 표현 방법을 통해 기술된 내용을 기계가 이해할 수 있도록 해주는 온 톨로지 시스템이 필요하다. 온톨로지 시스템은 일반적으로 OWL(web ontology language)로 표현된 온톨로지와 지식을 처리하는 추론시스템으로 구성되어 있으며 추론시스템으로는 연구 구현 예가 많은 LP(Logic Programming)방식의 추론시스템이 많이 사용된다. 하지만 LP방식의 추론기법들은 온톨로지를 처리하는데 있어 여러 가지 제약사항을 가지며 이로 인해 온톨로지 정보의 추론에 대한 효용성은 떨어진다. 이에 본 논문에서는 온톨로지 정보를 추론하기 위해 사용되는 기존 시스템들을 조사해 분류하고 문제점과 장점을 파악한 후 추론엔진의 효용성을 높이는데 필요한 최소한의 기능이 무엇인지 파악하여 기존의 LP엔진을 최대한 활용한 OWL추론엔진을 개발하는데 이용하고자 한다.
필터 뱅크 정규화 공통 공간-스펙트럼 패턴을 이용한 동작 상상 뇌파 분류
박상훈(Sang-Hoon Park),이다빛(David Lee),이상국(Sang-Goog Lee) 한국정보기술학회 2017 한국정보기술학회논문지 Vol.15 No.10
Recently, the Brain-Computer Interface(BCI) research based on motor imagery Electroencephalogram(EEG) receive attention in various fields such as engineering, medicine, and industry. The various methods are proposed for motor imagery EEG classification. Among them, Common Spatial Pattern(CSP) method is very effective in classifying motor imagery EEG. Therefore, it is applied in many studies. However, the CSP includes several problems. First, it is highly dependent on the frequency band. Second, it performs relatively weak in environments with a small number of data. Third, it does not consider the non-stationary of EEG. In this study, we propose filter bank regularized common spatio-spectral pattern method for overcoming these problems. The proposed method regularizes the time delay signal and non-time delay signal obtained from the filter bank, and extracts the features. The extracted features are classified through the ensemble. The proposed method outperforms than CSP, R-CSP, CSSP and FBCSP methods.
Small Sample Setting 동작 상상 EEG 분류를 위한 필터 뱅크 기반 정규화 공통 공간 패턴 앙상블 기법 연구
박상훈(Sang-Hoon Park),이다빛(David Lee),이상국(Sang-Goog Lee) 한국정보기술학회 2017 한국정보기술학회논문지 Vol.15 No.4
For the last few years, BCI(Brain-Computer Interface) researches have been pursued in the fields of medicine and engineering. Specially, the CSP(Common Spatial Pattern) method was widely used because it is useful for motor imagery eeg classification. However, it is difficult to select the frequency range according to the subjects, and it shows low performance in the SSS(Small Sample Setting) situation. In this paper, we propose a filter bank based regularized CSP to solve the frequency range selection problem and the problem in SSS situation. The proposed method consists of four steps. First, the filter bank is used to divide the signal. Second, normalized CSP is applied to each signal. Third, the features are selected by the MIBIF(Mutual Information Based Individual Feature) method. Fourth, the classification and the ensemble is based on the selected feature. The proposed method showed better performance than did the conventional methods. Especially, it showed better performance in SSS situation.
트윈 리프트용 신축 스프레다 유니트의 구조해석에 관한 연구
이상훈(Sang-Hoon Lee),정일중(Il-Jung Jeong),김동은(Dong-Eun Kim),이석순(Seok-Soon Lee),신상운(Shang-Woon Shin),한국남(Goog-Nam Han),김민규(Min-gyu Kim) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.5
This Study is a structure analysis about twin lift telescopic Spreader that usually loading and unloading a container in harbor. Applied load is assumed by lifting 65tons that is the maximum weight of real container. The finite element analysis for 3D model is performed by ABAQUS/Standard. We made an estimate of safety by evaluating the results of the finite clement analysis.