http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Pre-path를 이용한 무인자율주행차량의 Speed-planning
구자경(Jakyung Koo),김정하(Jungha Kim) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
For successful and stable driving of autonomous vehicle, it is needed that appropriate lateral and longitudinal control commands. Final control command values of autonomous vehicle are calculated based on current vehicle behaviors. In this study, firstly, perceive the critical points of previous method of speed-planning. On top of that, in order to make up for weak points in the current method, obtain the pre-path that vehicle should drive, using GPS(Global Positioning System) and IMU(Inertial Measurement Unit) sensors, and estimate heading variation ratio on each point. Moreover, via calculating the radius of curvature, present the speed planing algorithm that has not an effect on vehicle behavior instability.
국내외 기술기준 및 규격분석을 통한 제동작용장치 적합성 검증 방안 연구
구자경(Jakyung Koo),박진규(Jinkyu Park),강지성(Jisung Kang),민경빈(Kyeongbin Min),김상헌(Sanghun Kim) 한국철도학회 2017 한국철도학회 학술발표대회논문집 Vol.2017 No.05
최근 국내 철도산업은 안전에 대한 관심이 높아지면서 철도차량 및 부품 안정성 확보, 유지보수성 향상, 부품 국산화 및 표준화 등을 주요 쟁점사항으로 삼고 이와 관련된 연구 수행 및 인프라 구축에 힘을 쏟고 있다. 또한, 국내 강제인증인 철도안전법 과철도차량 및 용품 기술기준이 지속적으로 제·개정되면서 이에 관한 적합성 검증이 필수적으로 대두되고 있다. 본 연구에서는, 철도차량 제동에 필수적으로 사용되는 모듈 중 하나인 제동작용장치 제작을 위한 설계적합성, 제작합치성, 시험평가를 통한 적합성 검증을 수행함에 있어서 국내·외 법적 요구사항 적용 여부 및 제작에 관한 기술적 요구사항을 확인하고자 한다. In recent years, the domestic railway industry has focused on securing the stability of railway vehicles and components, improving maintenance and localizing and standardizing components as the interest in safety has increased. As the railway safety law, which is a domestic compulsory certification and railway vehicle and equipment technical standards have been constantly revised, it is essential to verify the compatibility with them. The purpose of this study is to validate domestic and overseas legal requirements application and technical requirements of break operating device which is one of the modules essentially used for railway vehicle braking in carrying out the conformity verification through design conformity, manufacturing conformity, and test evaluation.
구자경(Jakyung Koo),임종식(Jongsik Lim),안달(Dal Ahn) 한국정보기술학회 2009 Proceedings of KIIT Conference Vol.2009 No.-
이 논문에서는 적층형 가유전체 구조의 유효유전율과 유효투자율이 증가하는 현상을 이용하여 설계한 90° 하이브리에 대하여 기술하고 있다. SIAD 선로에서는 유효유전율과 유효투자율의 증가로 인하여 표준형 마이크로스트립 전송선로보다 선폭과 길이가 짧아지는 효과가 있는데, 이를 회로의 소형화에 활용한다. 예로써 90° 하이브리를 2㎓ 대역에서 설계하여 실제로 제작하여 측정한 결과를 제시한다. 종래의 표준형 회로와 비교할 때, 동일한 성능을 유지하면서도 회로의 크기가 36%만큼 감소한 결과가 소개된다. In this paper, a 90° hybrid is described and measured using substrate integrated artificial dielectric structure with increased effective permittivity and permeability. In a substrate integrated artificial dielectric transmission line, the length and width are shortened due to the increased effective permittivity and permeability. So it is useful to be applied for size-reduction. As an example, a 90° hybrid is designed using substrate integrated artificial dielectric transmission line structure and measured at 2㎓. The fabricated 90° hybrid is reduced by 36% from its original size while the performances are preserved.
DGS 전송선로의 등가회로와 전파지연계수에 대한 재고찰
林鍾植(Jongsik Lim),具滋慶(Jakyung Koo),韓相敏(Sang-Min Han),鄭龍采(Yongchae Jeong),安達(Dal Ahn) 대한전기학회 2008 전기학회논문지 Vol.57 No.11
A frequency-dependent slow-wave factor (SWF) and equivalent circuit model of transmission line with defected ground structures (DGS) is described. Once S-parameters of a DGS transmission line are given, the conventional frequency-independent equivalent circuit elements are extracted using 3㏈ cutoff and resonant frequencies (Fc and Fo) as the first step. Using the initial equivalent elements and simple transmission line theories, a frequency-dependent equivalent transmission line model is established through an analytical method, and finally the frequency-dependent SWF is calculated. The proposed equivalent circuit model and SWF are frequency-dependent and more reliable because even small insertion loss within available passband is considered, while they have been independent of frequency.
기판적층형 가유전체 전송선로의 특성 임피던스 계산 방법
임종식(Jongsik Lim),구자경(Jakyung Koo),한상민(Sang-Min Han),정용채(Yongchae Jeong),안달(Dal Ahn) 대한전기학회 2009 전기학회논문지 Vol.58 No.8
This paper describes a new method for extracting characteristic impedance of transmission line using Substrate Integrated Artificial Dielectric (SIAD). The new procedure to calculate the characteristic impedance of SIAD transmission line is described with the proper equations and basic transmission line theory. The characteristic impedance is determined as an almost fixed value in the proposed method, while it fluctuates according to frequency in the previous method. As the result, the effective dielectric constant of SIAD transmission line is calculated as a fixed value rather than fluctuating one. In order to show the validity of the proposed method, SIAD microstrip lines are simulated and measured, and characteristic impedances and effective dielectric constant are calculated and compared to the previous method.
임종식(Jongsik Lim),구자경(Jakyung Koo),한상민(Sang-Min Han),정용채(Yongchae Jeong),안달(Dal Ahn) 한국전자파학회 2008 한국전자파학회논문지 Vol.19 No.12
종래 발표된 D-CRLH 전송 선로의 설계상의 어려움과 주파수가 불가변성 문제를 해결하기 위하여 본 논문은 주파수 가변성이 있는 D-CRLH 전송 선로 구조 두 가지를 제안한다. 첫째 구조(type 1)는 DGS와 DGS 내의 아일랜드 패턴(island pattern)에 버랙터 다이오드를 연결하여 병렬 공진 회로 내의 CL을 조절할 수 있고, 둘째 구조(type 2)는 스터브에 다이오드를 연결하여 직렬 공진 회로 내의 CR을 조절한다. 바이어스 조절에 따라 RH/LH 대역에서 각각 +/-90도의 유의미한 전기적 길이를 갖는 이중 대역 주파수가 가변된다. 1~12 V의 바이어스 전압에 대하여 측정한 결과, LH 영역에서 -90도인 전기적 길이를 갖는 주파수가 type 1과 type 2에서 각각 4.22~5.39 ㎓와 4.21~5.05 ㎓이다. 또한, type 2의 경우에 RH에서 LH 영역으로 전환하는 주파수(ω∞)가 3.26~4.22 ㎓의 가변 영역을 갖는다. Frequency adjustable D-CRLH(dual-composite right/left handed) transmission lines, which solve the problem of design complexity and uncontrolled frequency of the existing structures, are proposed in this paper. The first design(type 1), consisting of defected ground structure(DGS), island pattern in DGS, fixed stub and varactor diodes, controls CL in the parallel resonant circuit, while the second structure(type 2) composed of fixed DGS, shunt stub and diode adjusts CR in the series resonant circuit. The dual band frequency points which correspond to the meaningful electrical length of +/-90 degree in the RH/LH region are adjustable according to the bias voltage. The measurement shows that the LH frequency point which has -90 degree of electrical length are adjusted over 4.22~5.39 ㎓ and 4.21~5.05 ㎓ for type 1 and type 2, respectively, under 1~12 V of bias voltage. In addition, the frequency ω∞ where RH turns over LH is controled over 3.26~4.22 ㎓ for type 2 with the same bias condition.
가유전체 기판구조를 이용한 소형화된 저역통과여파기 설계
임종식(Jongsik Lim),구자경(Jakyung Koo),이재훈(Jaehoon Lee),이준(Jun Lee),한상민(Sang-Min Han),안달(Dal Ahn) 한국정보기술학회 2011 한국정보기술학회논문지 Vol.9 No.5
A design of size-reduced high frequency low pass filter using artificial dielectric substrate (ADS) structure is described in this paper. ADS structures consist of the lower layer which has a lot of metalized via-holes, and the upper layer on which the transmission line and circuit patterns are realized. The increased effective permittivity and permeability of the ADS structure contribute to the size-reduction of high frequency circuits. In this work, a low pass filter (LPF) which is one of widely used high frequency circuits for wireless systems is designed, fabricated and measured for the verification of the proposed design technology of size-reduction using the ADS structure. Stub-type 2㎓ LPFs are designed and compared as examples using the ADS structure and standard substrate. The size of the LPF using the ADS structure is only 50.6% of that designed using the standard substrate, while the insertion and return losses are well preserved as an LPF without a critical degradation as an LPF.
임성준 ( Sungjoon Lim ),구자경 ( Jakyung Koo ),신석규 ( Seokkyoo Shin ) 한국정보처리학회 2005 한국정보처리학회 학술대회논문집 Vol.12 No.2
최근 부각되고 있는 기업 업무 프로세스 통합을 위해 EAI(Enterprise Application Integration) 시스템을 도입하고 있다. 하지만 아직 EAI 시스템의 품질을 보증하기 위한 테스트 방법이 제공되고 있지 않는 실정이다. 본 논문에서는 EAI의 기능을 이루는 요소별로 분리하고, 각각 분리된 기능별로 테스트를 수행하는 방법을 제시하고자 한다.