전철 지중배전선로의 충전전류보상에 관한 연구

김양수(Kim Yangsu),장우진(Jang Woojin) 한국철도학회 2008 한국철도학회 학술발표대회논문집 Vol.- No.-

Because on the high-tension underground distribution line of an electric railway high voltage XLPE Cable two or three circuits between railway stations with a standard as receiving transformer facilities are established at a 30㎞~50㎞ interval, reactive power in which the phase of a current is larger than that of a voltage is supplied when trains are not working, so when there are no loading or low loading as night. Due to the long-distance trend of the underground distribution system on an alternating current railway distribution line, the terminal voltage of a transformer is over the standard voltage, and after all, commercial cycle overvoltage is continued. To solve this problem, the shunt reactor is installed in middle of power distribution lines to maintain receiver voltage meted under the allowance regulation through control of the reactive power. Also, in case that the thickness of single cable is over 60㎟ and length of line is about over 30km, a circuit breaker is broken by shorting shunt ability of charging current in excess of shunt current(31.5A.rms). Therefore, this thesis presents installing the location of shunt reactor for quantitative analysis by using optimum algorism for compensation and control of the charging current.

OTPA분석을 통한 로봇 갠트리의 이송소음 분석

김영만(Yeongman Kim),윤문영(Moonyoung Yoon),백승환(Seunghwan Baek),김양수(Yangsu Kim),김흥섭(Heungseob Kim) 대한기계학회 2017 대한기계학회 춘추학술대회 Vol.2017 No.11

대통령 후보자의 이미지와 지지성향에 대한 탐색적 연구

전혜진(Jeon Hyejin),김양수(Kim Yangsu) 21세기정치학회 2012 21세기 정치학회보 Vol.22 No.2

The primary purpose of this study is to deviate from the current trend of researches which distinguish each political candidate in terms of their individual images or explore the influence of exposure to specific media, so as to analyze the influence of political communication based upon candidate images and support for those candidates. Various attempts are being made within the political sphere to garner supports from the younger generation. On the basis of this context, this study focuses mainly on the concept of politicians’ images, which the voters can view as extensive criteria for assessing each candidate. This study represents an explorative attempt to comprehend the younger generation’s political participation, in terms of the criteria they rely on in judging political candidates and the variables which serve as major criteria that influence their support and voting. It analyzes the image of each candidate engraved in the voters’ cognitive maps, and investigates the correlation between such image assessments and support tendencies. This study also explores the difference within/between support groups in terms of how voters of various support tendencies assess the image of each candidate, in an effort to reach a whole new dimension of voters’ interpretation of candidate images in political communication.

Frequency And Time Domain Characteristics Analysis Of Hydraulic Bushing

Nguyen Van Quyet,Yeongman Kim(김영만),Yangsu Kim(김양수),Seongbum Lee(이성범),Heungseob Kim(김흥섭) 대한기계학회 2017 대한기계학회 춘추학술대회 Vol.2017 No.11

Recently the hydraulic bushings in suspension and sub-frame system of a rear-wheel driving vehicle are adapted to improve ride quality and reduce noise and vibration. The dynamic stiffness and damping properties of these hydraulic bushings are highly dependent on the amplitude and frequency of excitation force as well as the static load, but analytical case studies about such dynamic responses are not enough. The dynamic stiffness and loss angle of a hydraulic bushing are a crucial purpose functions and it is significant to investigate the relation between the design parameter of internal structure and these functions. During the design stage of a hydraulic bushing with one fluid element, it is not easy to adjust the maximum frequency of loss angle to specific frequency of the most disruptive excitations due to geometry limitations of the fluid track. In this study, the design factors such as fluid flow passage, internal chamber are selected to affect the dynamic characteristics of hydraulic bushing. And the analytical study is implemented in several hydraulic bushing configurations with different combination of design factors. The formulation with lumped parameter model about hydraulic bushing configurations is implemented and the variation of dynamic stiffness and loss angle is examined with MATLAB simulation in time and frequency domain. Finally the feasible and practical modeling method of hydraulic bushing will be proposed.

동역학 해석기반 초고강도/초경량 소재 전륜 서브프레임 개발

신종현(JongHyun Shin),전원현(WonHyeon Jeon),김양수(Yangsu Kim) 한국자동차공학회 2018 한국자동차공학회 부문종합 학술대회 Vol.2018 No.6

자동차 후륜 샤시 부품의 용접변형 거동 해석

배문기(Moonki Bae),윤철호(Zhehao Yin),김양수(Yangsu Kim),이기동(Keedong Lee),김영석(Youngsuk Kim) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11

The CTBA(Coupled torsion beam axle) of automotive rear chassis parts connects to trailing arm which assembled on the rear axle by whelding process and achieves a task of absorbing torsion from wheel when automobile pass through the curves. In the welding process between CTBA and trailing arm, the welding deformation of trailing arm which connected to wheel hub axle module occurs, and it can effect to tow angle, camber angle, and caster of the wheel axle. Thus, the welding deformation should be controled strictly. In this paper, the welding process between CTBA and trailing arm was analyzed by FEM(Finite Element Method), the effect of welding time, temperature after welding process, clamping time and cooling time was grasped, and phase transformation after welding process was analyzed to minimize the after-machining(milling) of the welding part.

핫 스탬핑 공정을 이용한 자동차용 프론트 크로스 멤버 개발

윤석진(Sukjin Yoon),박종규(Jongkyu Park),김양수(Yangsu Kim),정재규(Jaegyu Jung),전진화(Jinhwa Jeon) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11

In the automotive industry, the high strength steel offers the possibility to obtain significant reduction of weight without affecting the structural performances of final products. The hot stamping represents an innovative manufacturing process for forming of high strength steels, implying a sheet at austenite temperature being rapidly cooled down and formed into a die at the same time(quenching). This forming process is used for the manufacturing of automobile structural components with a strength of up to 1,500㎫, thus enabling extensive cost saving and good crash performance. In this study thermal-mechanical coupled simulation with PAM-STAMP™ was carried out for forming and cooling of a hot stamped part. Moreover, mechanical properties of front cross member with hot stamping.

재발한 간담도암 환자에서 시행 한 high-dose-rate intraluminal brachytherapy의 유용성 및 재현성 평가

박주경(Jukyeong Park),이승훈(Seunghun Lee),차석용(Seokyong Cha),김양수(Yangsu Kim),이선영(Sunyoung Lee) 한국방사선학회 2012 한국방사선학회 논문지 Vol.6 No.2

간담도암의 일차적 치료법은 수술적 제거이나, 초기 병기로 수술을 하여도 재발이 흔하며, 재발 후에는 근치적 목적이 아닌 주로 증상 완화 목적의 치료를 하고 있다. 이에 본 연구에서는 재발한 환자에서 자체 도입한 특수 관을 이용한 근치적 목적의 high-dose-rate intraluminal brachytherapy의 치료법과 치료 set-up 재현성 유지에 대하여 고찰하고자 한다. 본 연구는 간담도암으로 수술 후, 6개월 간격으로 복부 자기 공명 영상을 이용한 추적 검사를 시행하여, 수술 문합 부위의 재발이 확인된 임상 병기 rcT1N0M0인 환자를 대상으로 하였다. 근접 치료를 위하여 경피적 담도 배액관을 치료 전용관인 Arrow Sheath로 교체 후, intraluminal catheter를 삽입하여, 일회 치료당 3 Gy 씩 총 30 Gy 근접치료를 시행하였다. 협착 된 담도의 distal and proximal 그리고 central axis point로부터 1 cm 떨어진 지점을 선량표준화였으며, 5회에 걸쳐 치료 전 dummy seed 삽입 후, 치료 표적 용적 근위부와 말단부의 기준점에서 흉추 사이의 거리를 측정하여 set-up 재현성을 평가하였다. 매주 치료 전 근위부와 말단부위 치료 표적 용적 기준점에서 흉추 사이의 거리를 5회 측정한 값과 simulation image에서 측정된 거리를 비교한 결과 평균값과 표준편차가 오차율 5% 이내로 유의한 수준으로 측정되어 매회 치료시 재현성이 유지 되었다, 본 연구 환자의 추적 검사 상 1년 이상 무병 생존하고 있으며, 심각한 부작용 또한 관찰되지 않았다. 따라서, 수술이 불가능한 재발한 간담도암 환자에서 본원에서 자체 도입한 관으로 시행한 근접치료는 주변 인접 장기의 심각한 부작용 발생 없이, 매 회 치료 시 재현성이 유의한 수준으로 유지되는 것으로 평가되었다. General treatment for cholangiocarcinoma is complete surgical resection. However recurrence is common in those patients. In most of cases the purpose of the treatment for patients with recurrent is palliative. Therefore we adopt intraluminal catheter to treat a recurrent patient with high-dose-rate intraluminal brachytherapy. This study aims to evaluate the treatment procedure and set-up reproducibility of intraluminal brachytherapy in the recurrent patient. Study patient was diagnosed at rcT1N0M0 and undergone intraluminal brachytherapy after Arrow Sheath insertion. 3 Gy was delivered in every fraction with a total dose of 30 Gy. We planned dose normalization at distal, proximal and central axis point of narrowed bile duct far from 1 cm. To evaluate set-up reproducibility, we measured distance between distal, proximal treatment target volume point and anterior surface of the thoracic vertebral body respectively for five times before every treatment with dummy seed insertion. Mean distance between distal, proximal treatment target volume point and anterior surface of 10th and 11th thoracic vertebral bodies is 0.5 cm, 6.1 cm and standard deviation is 0.06, 0.08 respectively. In addition, set-up reproducibility was maintained significantly. The patient has been alive with no evidence of disease recurrence for more than a year and has not yet reported severe complications. In conclusion, high-dose-rate intraluminal brachytherapy for unresectable recurrence of cholangiocarcinoma maintains high set-up reproducibility without severe side effects.

그린 하이브리드 열펌프 제습기

조승구(Sungku Cho),금종수(Jongsoo Kum),박승상(Seungsang Park),김양수(Yangsu Kim),박승태(Seungtae Park),박성찬(Seongchan Park) 대한설비공학회 2011 대한설비공학회 학술발표대회논문집 Vol.2011 No.7

정류기 부분방전신호 검출을 위한 SHF대역 전자파 센서의 성능평가

정호성(Hosung Jung),박영(Young Park),조용현(Yonghyeon Cho),장순호(Sunho Jang),장명길(Myounggil Jang),김양수(Yangsu Kim) 한국철도학회 2012 한국철도학회 학술발표대회논문집 Vol.2012 No.5

DC power traction system utilizes rectifier in order to convert AC to DC. Currently, a research on preventive diagnosing facilities to detect rectifier fault in advance is in progress. It is efficient to detect partial discharge signals by electromagnetic wave detection in order to detect insulation fault of rectifier. Although VHF, UHF sensors were adopted to detect partial discharge of power facilities, due to characteristics of urban railway, excessive noise occurs in 500MHz ~ 1.5GHz UHF bandwidth. Consequently, in this paper, comparison and estimation for performance of SHF sensor which had devised to detect partial discharge signal of urban railway rectifier has conducted. In order to estimate performance of SHF sensor, we have compared the sensor with existing UHF sensor on sensitivity upon frequency bandwidth generated by pulse generator, and also we have verified performance of the SHF sensor by detection results of partial discharge signal from urban railway rectifier. 직류 급전시스템에서 교류를 직류로 변환하기 위해 정류기를 사용하고 있으며, 최근 정류기의 고장을 사전에 검출하기 위한 예방진단장치에 대한 연구가 진행되고 있다. 정류기의 절연상태 이상을 검출하기 위해서는 전자파 계측을 통한 부분방전신호를 검출하는 방식이 효율적이다. 일반적으로 전력설비의 부분방전신호를 검출하기 위해서 VHF, UHF 대역의 부분방전용 센서가 적용되고 있으나, 국내의 도시철도 특성상 500MHz ~ 1.5GHz 의 UHF 대역 사이에는 많은 노이즈들이 존재하고 있다. 따라서 본 논문에서는 도시철도 정류기의 부분방전신호를 검출하기 위해 개발된 SHF대역의 전자파 센서의 성능을 비교, 평가하였다. SHF 센서의 성능을 평가하기 위해 기존의 UHF대역 센서와의 펄스발생기를 통한 주파수 대역에 대한 감도를 비교하였으며, 도시철도에서 운영 중인 정류기의 부분방전신호 검출 결과를 통해 개발된 SHF대역 전자파 센서의 성능을 검증하였다.