http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
일부 농촌지역에서 뇌졸중의 위험요인에 관한 연구 -환자 대조군 연구-
한성현,이성수,Han, Sung-Hyun,Lee, Sung-Soo 대한예방의학회 1988 Journal of Preventive Medicine and Public Health Vol.21 No.1
The main objectives of this study were to know the prevalence of cerebrovascular diseases, to find the important risk factors of cerebrovascular diseases. This study is a part of Eumseong Community Health Project supportes by GTZ(West German Goverment). 116 perceived cases of cerebrovascular diseases were first screened by health interview and examinations and 80 cases were diagnosed as a cerebrovascular group. For comparison, 80 cases were matched with their neighbor controls of the same sex and the similar age. 1. The prevalence rate for cerebrovascular diseases was 476.3 per 100,000 population which is considered to be very high compared with that of other countries. Age adjusted rate for cerebrovascular diseases was 261.6 per 100,000. 2. Among the risk factors examined for the association with cerebrovascular diseases by case-control study, and analysed by paired marginal test(McNemar's $X^2$-test) and odds ratio, only hypertension showed high significant statistical association.
논문 : 지반 확률변수의 불확실성 정량화에 관한 사례연구
한성현 ( Sang Hyun Han ),여규권 ( Geu Guwen Yea ),김홍연 ( Hong Yeon Kim ) 대한지질공학회 2012 지질공학 Vol.22 No.1
지반정수의 통계적 불확실성을 설계에 반영함으로써 합리적인 설계를 하기위한 확률론적 설계법이 국내외에서 설계기준으로 채택되고 있는 추세이다. 본 연구에서는 지반 확률변수의 불확실성을 정량화 하기위한 기법과 획득한 자료의 수 에 따라 불확실성을 최소화함으로써 설계의 경제성을 기할 수 있는 기법들을 분석하였다. 국내의 특정 현장에서 채취되고 실험된 토질정수를 불확실성 정량화를 위한 몇 가지 기법들에 적용하고 비교하였다. 그 결과 3-sigma기법은 자료를 이용하여 산정된 표준편차에 비하여 모두 낮게 평가되어 확률론적으로 경제적인 설계가 가능하나 샘플 수를 고려하지 않은 Bayesian 기법을 이용하여 사전정보와 조합한 경우 일부의 변수는 3-sigma기법이 작게 산정되어 불안전한 설계의 우려가 있었다. 샘플 수를 고려하여 Bayesian 분석한 경우는 상대적으로 가장 낮은 분산을 보였다. 샘플 수가 증가할수록 확률밀도함수의 분산이 현저히 감소하였고 25개 이상인 경우 전체적으로 일정수준에 수렴하였다. 특히, 단위중량과 같이 변동성이 작은 확률변수의 경우 상대적으로 적은 샘플 수에서도 사후정보에서 신뢰도 높은 값을 추정할 수 있었다. Probabilistic design methods have been used as a design standard in Korea and abroad for achieving reasonable design by considering the statistical uncertainties of soil properties. In this study, the following techniques for reflecting geotechnical uncertainty are analyzed: quantification of the uncertainties of geotechnical random variables, and consideration of economic feasibility in design by minimizing the uncertainties related to the number of samples. To quantify the uncertainties, the techniques were applied to soil properties obtained from samples collected and tested in the field. The results showed an underestimation of the standard deviation by the 3-sigma approach in comparison with calculations using data from the samples. This finding indicates that economical design is possible in terms of probability. However, when compared with the Bayesian approach, which does not consider the number of samples, variability in the 3-sigma approach is underestimated for some variables. This finding also indicates a safety issue, whereas the number of samples based on the Bayesian approach showed the lowest variance. The variance of the probability density function showed a marked decrease with increasing number of samples, to converge at a certain level when the number exceeds 25. Of note, the estimation of values is more reliable for random variables having low variability, such as soil unit weight, and can be obtained with a small number of samples.
직접 적응제어방식에 의한 로봇 머니퓰레이터의 견실한 제어기 설계에 관한 연구
한성현(Sung-Hyun Han),박한일(Han-Ill Pak) 한국해양공학회 1989 韓國海洋工學會誌 Vol.3 No.2
This paper deals with the robust controller design of robot manipulator to track a desired trajectory in spite of the presence of unmodelled dynamics in cause of nonlinearity and parameter uncertainty. The approach followed in this paper is based on model reference adaptive control technique and convergence on hyperstability theory but it does away with the assumption that process is characterized by a linear model remaining time invariant during adaptation process. The performance of controller is demonstrated by computed simulation about position and speed control of six link manipulator in case of disturbance and payload variation.
한성현(Sung-Hyun Han),이우송(Woo-Song Lee),김윤구(Wn-goo Kim),김홍래(Hong-Rae Kim),조창제(Chang-jae Cho) 한국생산제조학회 2006 한국공작기계학회 춘계학술대회논문집 Vol.2006 No.-
This paper proposed trajectory tracking control of Mobile Robot. Trajectory tracking control scheme are Real coding Genetic-Algorithm and Back-propergation Algorithm. Control scheme ability experience is proposed by simulation.
초음파 센서 및 음성인식 기반 자율주행로봇의 지능제어에 관한 연구
한성현(Sung-Hyun Han),김윤구(Wn-Goo Kim),Le Xuan Thu,신행봉(Haeng-Bong Shin),조창제(Chang-jae Cho) 한국생산제조학회 2006 한국공작기계학회 춘계학술대회논문집 Vol.2006 No.-
In this paper, it is presented a new approach to the design of intelligent control system of a autonomous robot with two drive wheel. The proposed control scheme uses a Gaussian function as a unit function in the fuzzy neural network, and back propagation algorithm to train the fuzzy neural network controller in the framework of the specialized learning architecture. It is proposed a learning controller consisting of two neural network-fuzzy based on independent reasoning and a connection net with fixed weights to simply the neural networks-fuzzy. The performance of the proposed controller is shown by performing the computer simulation for trajectory tracking of the speed and azimuth of a mobile robot driven by two independent wheels.
한성현(Sung-Hyun Han),Le Xuan Thu,김홍래(Hong-Rae Kim),안종국(Jong-Kug An) 한국생산제조학회 2006 한국공작기계학회 춘계학술대회논문집 Vol.2006 No.-
The equipment of industrial robot in manufacturing and assembly lines has rapidly increased. In order to achieve high productivity and flexibility, it becomes very important to develop the visual feedback control system with Off-Line Programming System(OLPS). We can save much efforts and time in adjusting robots to newly defined workcells by using OLPS. A proposed visual calibration scheme is based on position-based visual feedback. The calibration program firstly generates predicted images of objects in an assumed end-effector position. The process to generate predicted images consists of projection to screen-coordinates, visible range test, and construction of simple silhouette figures. Then, camera images acquired are compared with predicted ones for updating position and orientation data. Computation of error is very simple because the scheme is based on perspective projection, which can be also expanded to experimental results. Computation time can be extremely reduced because the proposed method does not require the precise calculation of tree-dimensional object data and image Jacobian.
한성현(Sung-Hyun Han),신행봉(Haeng-Bong Shin),Le Xuan Thu,안종국(Jong-Kug An) 한국생산제조학회 2006 한국공작기계학회 춘계학술대회논문집 Vol.2006 No.-
We propose a new technique to the development of Intelligent control algorithm based-on digital signal processors in order to improve the precision and robustness for system of industrial robot. Intelligent control has emerged as one of the most active and fruitful areas for research in the applications of fuzzy set theory, especially in the real of industrial processes. In this thesis, a self-organizing fuzzy controller for the industrial robot manipulator with a actuator located at the base is studied. A fuzzy logic composed of linguistic conditional statements is employed by defining the relations of input-output variable of the controller, In the synthesis, one of the most difficult problems is the determination of linguistic control rules from the human operators. To overcome this difficult, SOFC is proposed for a hierarchical control structure consisting of basic level and high level that modify control rules. The proposed scheme is simple in structure, fast in computation, and suitable for implementation of real-time control. Performance is illustrated by simulation and experimental results for SCARA robot.