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정환수(Hwan-Su Jeong),최수진(Su-Jin Choi),정구섭(Gu-Seop Jung),장영준(Young-Jun Chang) 한국자동차공학회 2000 한국자동차공학회 지부 학술대회 논문집 Vol.- No.-
The analysis of double-exposed photographic plate can be carried out either by Young's fringe analysis or by a digital image processing technique in Particle Tracking Velocimetry. In this Study, we used digital image processing to two images in one frame for analyzing in-cylinder flow fields, and The result of PTV(Particle Tracking Velocimetry) was compared with it of PSV(Particle Streak Velocimetry). Additionally, This technique was verified by three different calibration methods. One is interpolation by invert distance, another is interpolation by area ratio, the third is interpolation by Taylor series 1st.<br/> In PTV, The error range of curvature is about 1.4∼5 %. The results among three interpolation methods were similar in whole flow fields. Finally, in the comparison of PTV and PSV, PTV can be applicable of the analysis and the flow visualization on in-cylinder flow fields.
철도차량용 하이브리드 비접촉 제동장치의 dc 제동에 관한 연구
정환수(Hwan-Su Jung),한경희(Kyung-Hee Han),손원석(Won-Seok Son),이장무(Chang-Mu Lee),장길수(Gil-Soo Jang) 한국철도학회 2017 한국철도학회 학술발표대회논문집 Vol.2017 No.05
철도차량은 주로 공기제동 및 회생제동을 병행하여 제동력을 발생시키지만, 패드 및 디스크의 접촉으로 마모와 소음 문제가 발생하며 미세먼지를 증가시키는 것 뿐만 아니라 제동력이 변화하는 문제점을 지니고 있다. 문제점 개선을 위해 와전류 제동의 다양한 연구가 진행되어 오고 있다. 본 논문에서는 철도차량 제동 시에는 와전류 브레이크로서 동작하고, 운행 시에는 보조 동력원으로 동작할 수 있는 하이브리드 비접촉 제동기의 축소 모델을 제작하였으나 상이한 결과값의 문제점을 해결하기 위해 하이브리드 비접촉 제동의 다양한 요소 해석을 진행하고, 비교, 분석하여 dc 제동 특성에 대해 알아보고자 한다. Railway vehicles generate braking force primarily in combination with air brakes and regenerative braking, but contact with the pads and disks, they occurred a lack of wear and noise, as well as a change in braking force. Various studies have been conducted in order to improve the eddy current brake problems. In this paper, a miniature model of a hybrid non - contact brake that operates as an eddy current brake during rail vehicle braking and as an auxiliary power source during operation is produced. However, the results showed different values. In order to solve the problem, various elements of hybrid non-contacting brake were analyzed, and the dc braking characteristics were compared and analyzed.
가미열다한소탕(加味熱多寒少湯) 투여후 아토피 피부염 환자의 임상상 변화에 대한 연구
정환수,이진용,Jung Hwan-Su,Lee Jin-Yong 대한한방소아과학회 2001 대한한방소아과학회지 Vol.15 No.2
Background : Atopic Dermatitis is thought to be a common and chronic relapsing inflammatory skin disease that probably results from allergic reaction. Because it make some serious problems in children, it is needed to treat and at least subside symptoms. Objective : The aim of this study was to evaluate the efficacy of GamiYeoldahansotang(加味熱多寒少湯) for treating Atopic Dermatitis and survey the general characteristics in children with Atopic Dermatitis. Method : Atopic Dermatitis with typical clinical symptoms were included in this study. Forty two patients were treated with hot water extract of GamiYeoldahansotang(加味熱多寒少湯) for four weeks. Clinical evaluation were made by Jacob T scoring system before and after treatment. Total Serum IgE, Eosinophil count were also conducted. Results : Reduction in body surface area was not observed. But significant reductions of severity scores before and after adminstration of GamiYeoldahansotang(加味熱多寒少湯) were observed in all of three groups: mind, moderate, severe. specially severe intensity group was very statistically significant.(p<0.05) Conclusion : We speculate that GamiYeoldahansotang(加味熱多寒少湯) has some therapeutic effects in mitigating the symptoms of Atopic Dermatitis.
정환수(Hwan-Su Jung),이장무(Chang-Mu Lee),장길수(Gil-Soo Jang) 한국철도학회 2016 한국철도학회 학술발표대회논문집 Vol.2016 No.5
철도차량에서는 주로 회생제동과 공기제동을 병행하여 제동력이 발생하게 된다. 공기제동시스템은 공기를 이용한 마찰제동으로 높은 유지보수 비용, 마모, 소음과 미세먼지로 인한 제동력 변화를 야기한다. 공기제동시스템의 문제점을 보완 할 Drum 형 전자석 와전류 브레이크를 철도차량 적용에 검증하기 위해 1/50 크기에 해당하는 축소 모델을 제작, 실험을 진행하였다. 설계된 와전류 브레이크 축소모델과 제작된 축소모델의 제동력을 Drum 의 RPM 를 변화시키며 비교, 검증하고 온도 상승으로 인한 제동력의 변화를 분석하였다. The rail cars are generated the braking torque using the air braking system with regenerative braking. Air braking system, brake friction with the air, results in a change in the braking torque because of high maintenance cost, abrasion, noise and dust. A scale model that corresponds to the size of 1/50 was manufactured, conducted an experiment to verify the Drum-type eddy current brake electromagnet to complete the problems of the air brake system on a railway vehicle application. Designed and manufactured eddy current scaled model were compared to the braking torque changes in the RPM of the drum and analysis the changes in the braking torque due to the temperature rise.
무선전력전송 차량 급전인버터에 대한 SFES 활용방안연구
정승민(Seungmin Jung),정환수(Hwan-Su Jung),장길수(Gilsoo Jang) 한국철도학회 2016 한국철도학회 학술발표대회논문집 Vol.2016 No.5
현재 개발되고 있는 무선전력전송 차량충전시스템은 교류를 공급받아 인버터에서 고주파 전력으로 변환하여 차량에 무선으로 전력을 공급하는 형태이다. 최근 변환 과정에서의 손실과 타 변전설비와의 연계 문제를 개선하기 위해, 무선전력전송 충전인버터에 공급하는 전기시스템을 직류로 구성하여 문제를 해결하고자 하는 방안이 연구되고 있다. 본 논문에서는, 해당 직류시스템을 바탕으로 최근 주목 받고 있는 플라이휠 에너지 저장장치를 활용하여 차량 충전 시 발생할 수 있는 저전압 현상을 개선하고 효율적인 에너지 수급을 진행하도록 진행하고자 하였다. 순간적인 전력 공급을 요하는 초고주파 충전 인버터에 대응할 수 있도록 EMTDC 시스템을 구성하였다. It is recommended to establish the power subsystem nearby the transformer because the charging system usually demands significant power. However, as the system is usually built in urban area and it makes hard to construct the subsystems at every station, low voltage conditions can generate in power subsystem that is some distance from the distributed transformer. Recently, the DC distribution system is introduced and has possibility to solve the above issue. In this paper, SFES is introduced to solve the voltage drop under the low voltage distribution system. The case study to utilize the SFES by using DC power flow analysis is carried out and it is tested in this paper.
이장무(Chang-Mu Lee),장동욱(Dong-Uk Jang),김재원(Jae-Won Kim),한문섭(Mun-Seup Han),정환수(Hwan-Su Jung),김주락(Joo-Rak Kim) 대한전기학회 2016 전기학회논문지 Vol.65 No.11
In order to analyze the power consumption pattern of the DC urban rail system, the method to obtain a solution establishing the current equation according to fixed position of the substation and varying position of the train is used. The proposed analysis method using the network analysis is to model the transfer function of the component constituting a direct current power supply system (dc substation, train, catenary) to the voltage and current. By multiplying the model formula consecutive, it can calculate the voltage and current of each element of power supply circuit and shows a simple case analysis.