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林聖洙,李仁遠 弘益大學校 科學技術硏究所 2000 科學技術硏究論文集 Vol.11 No.-
Travel time function which is currently used in Traffic Assignment is BPR function. Monotonous increase BPR Function is made by relationship between Traffic Volume and Travel time. As it is simplified for convenience of mathematical calculation, cant explain the real situation in traffic flow such as Capacity Drop. Also It must be developed for providing the real time travel information that new travel time function which is precisely reacted at the change of Traffic flow. The main idea of this thesis is to develop a realistic travel time function that is based on the headway, one of the main characters of microscopic traffic flow. In order to establish solid model, the study used data which are collected in "KangBuk" freeway between Hangang Railway Bridge and Hangang Bridge, Hannam Bridge and Banpo Bridge and the summary of the result is as follows. The function of travel time, set by the independent variable that is accumulation of output-input headway, must be settled in two patterns in order to correctly describe size of traffic and traffic condition such as backward bended curve of travel time, non-reversal and, multiplicity; when traffic congestion gets increased and decreased. However, although the forecasting ability of Ran's function of travel time was found to be relatively high, but they were also found that they did not reflect non-reversal, multiplicity that can be observed from the reality. This study result suggests that forecasting method of traffic time that uses headway is simple in formula and holds high accuracy in traffic characters. Also, it can explain the traffic condition in more correct way by calculating the traffic time using headway and it can provide real time traffic information. If it is possible to make an additional revision in precondition of delay time resulted from passing and changing lines, it is should be able to realistically estimate dynamics in traffic flows when it is adapted to the various kinds of traffic management method such as ramp metering in merging sections on freeway.
자동차 이중전원 시스템을 위한 새로운 양방향 ZVS CUK 컨버터
이성룡,이수원,고성훈,문제민 국립7개대학공동논문집간행위원회 2004 공업기술연구 Vol.4 No.-
Currently, to overcome the limit of a 14V power supply system and to enhance the stability of this system high and to make the fuel efficiency better, a research development of a 42V power supply system is actively the progress. As an intermediate step to change into an unity power supply system, a 42V/14V dual power supply system uses a DC/DC Converter as one of structure elements. Considering the main electric power sources in the next generation of the car is a 42V system, a 14V power supply system has advantages as follows : to be managed efficiently and to increase the redundancy at start, to jump start with any vehicles, etc. We need the introduction of a bi-directional converter that can flow the energy each other in a dual 42V-12V system. This paper proposed the ZVS bi-directional CUK DC/DC converter which decrease the weight with the size of the DC/DC Converter and minimize the loss when the switching happen. In this paper, a circuit design method and an action principle of the circuit was proposed. To verify the proposed circuit, a comprehensive evaluation with theoretical analysis, simulation results is presented.
속도 Observer를 이용한 유도전동기 센서리스 벡터제어
이수원,전칠환,이성룡 국립7개대학공동논문집간행위원회 2002 공업기술연구 Vol.2 No.-
The stability for a speed sensorless vector control of an induction machine has been studied. These studies show that the sensorless control is apt to be more unstable than the control with sensor on the variation for stator resistance, rotor resistance and system parameters of the machine. First, this paper investigates the start-up and transient characteristics when the inertia, J, changes and the rotor resistance, R_r, changes respectively for a step change of a speed reference, ω_r. Then, the new speed estimation algorithms with no effects on the parameters variation of the machine and the system is proposed. The proposed method is to implement the observer using voltage, current and constant of the machine. The results are verified by simulation.
조영미,정원문,임봉수,박영성 대전대학교 환경문제연구소 2001 환경문제연구소 논문집 Vol.5 No.-
A concetrated evaporation experimnt was carried out in this study, to find out the removal and concoentration efficiency of havy metals from concentration process as well as analysis and investigation for the characteristics of the condensed water. In the experiment of wastewater treatment from X-ray film by using concentrated evaporation, the results show that COD removal efficency rate was more than about 99%, the major toxic metals, including Pb, CN, F, Zn was almost removed. It could be seen that the early boiling point of each wastewater was 108.5℃ for the wastewater of the fixing solution, 106.7℃ for the wastewater of developing solution and 107℃ for the mixture(1:1) of both wastewater. The increasing rate of boiling point was the greatest in the wastewater of the developing solution and the mixture and the wastewater of fixing solution in descending order. The boiling point under latm in a vacuum was 30℃ for the wastewater of the developing solution, 37℃ for the wastewater of fixing solutions, and 35℃ for the mixture.
유기질비료 시비량에 따른 오미자 묘목의 초기 생육특성에 관한 연구
이경아,박태호,박성용,김도현,오문국,김민수,안태진,이상원,김영국,안영섭,박충범,차선우,송범헌 忠北大學校 農業科學硏究所 2015 農業科學硏究 Vol.31 No.1
This study was carried out to have basic and applied informations to find the optimum nitrogen fertilization level for organic cultivation and to investigate early growth characteristics of Schizandra chinensis Baillon. Different application levels of the organic fertilizer were based on the recommended rate of N fertilizer. Five different levels of the organic fertilizer were applied to S. chinensis and early growth responses such as the length of vine, the diameter of vine, the number of leaves, and the number of branches were investigated. Lengths of main and total vines were shown longer at the level of 1.0 time organic fertilizer than those at others. The vine length at early growth was the highest at the level of 1.0 time organic fertilizer among the treatments. Stem diameter was shown thicker level of 1.0 time organic fertilizer than others on August and September, whereas on October it was the thickest in the conventional cultivation. Number of leaf was increased higher at the level of 1.0 and 2.0 times organic fertilizer than that in the compared to conventional. The number of branches was appeared the lowest at the level of 1.0 time organic fertilizer at early growth, however they were increased through progressing their growth stages. They were not significantly difference among the treatments except for the level of 2.0 times organic fertilizer. Based on the research results, the growth of S. chinensis was commonly higher at the level of 1.0 time organic fertilizer compared to other treatments.
제통단이 퇴행성 슬관절염 환자의 삶의 질에 미치는 영향
서병관,류성룡,강중원,우현수,이상훈,이재동,최도영,김건식,이두익,이윤호 EAST-WEST MEDICAL RESEARCH INSTITUTE KYUNG HEE UNI 2005 東西醫學硏究所 論文集 Vol.2005 No.-
Objectives : to evaluate the effects of Jetongdan, the newly developed herbal medicine, on the quality of life in patients with osteoarthritis of knee Methods : Placebo-controlled, randomized clinical trial on the 80 patients with osteoarthritis of the knee was fulfilled. After enrollment, they took medication as they enrolled. And they were asked to answer the questionnaires (Korean Health Assessment Questionnaire (KHAQ), Lequesne's functional index (LF1), visual analogue scale (VAS)) and analysed with the erythrocyte sedimentation rate (ESR) at baseline, after 4 weeks and 8 weeks of medication. Results : Total KHAQ score, some categories of KHAQ like hygiene, activities were significantly improved after 8 weeks of medication. And the change of the KHAQ score was significantly correlated with the change of VAS. But LFI, VAS, ESR level was not significantly improved, and it was considered because of the short medication period and small size of study population. Conclusion : In conclusion, Jetongdan could improve the health-related quality of life in patients with osteoarthritis of knee. Further study in the large population, in long period were recommended.