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김용은(Yong Eun Kim),이호성(Ho Seong Lee),원종필(Jong Phil Won) 대한전자공학회 2020 전자공학회논문지 Vol.57 No.4
CAN (Controller Area Network)통신은 신뢰성이 필요한 분야에서 통신 방식으로 사용되고 있다. CAN 통신의 특징은 두선의 와이어에 여러 개의 ECU를 연결하는 형태로 선로 상에 문제가 발생하면 ECU 간의 통신이 불가하다. 특히 전선의 내부 파라미터(저항, 인덕턴스, 커패시턴스)에 의해 임피던스의 변화가 발생하고 이로 인해 신호의 왜곡 및 링잉 현상이 발생한다. 또한 CAN 통신 라인에 연결되는 ECU의 입력 단 임피던스, 조인트 커넥터의 영향 등에 의해 깨끗한 구형파가 왜곡되는 현상이 발생하는 것을 검사할 필요가 있다. 본 논문에서는 해당 위치에서 송신하는 CAN ID에 해당하는 구형파를 FFT 연산하여 해당 위치 지점에서 검사지점까지의 전송선로의 상태를 파악하는 방법을 제안하며 실제 가상으로 전선의 모델을 PSPICE로 모델링하여 전선의 상태에 따른 파형을 시뮬레이션 하였다. 또한 실제 전선을 이용하여 오실로스코프로부터 받은 파형 값의 FFT를 연산하여 제안한 방법을 이용하여 전선의 선로 검사가 가능함을 보였다. CAN (Controller Area Network) communication is used in the fields where reliability is required. CAN communication features two wire lines connecting multiple electronic control units (ECUs). Therefore, if there is a problem with the line, ECUs cannot communicate with each other. In particular, impedance occurs based on the internal parameters of the wire (resistance, inductance, and capacitance), which distorts signals and causes a ringing phenomenon. Also, clean square waves can be distorted under the influence of the impedance of an ECU input terminal and the joint connector to CAN communication lines. In this study, FFT computation was performed on the square waves (CAN ID) received at a certain location, the method of examining the status of the transmission line from the location to the testing point was proposed, a virtual model of the lines with PSPICE was created to conduct a simulation on the waveforms according to the status of the wire. Using a real wire, the FFT of the waveforms received from the oscilloscope were calculated and it was demonstrated that it is possible to test electric wires using the proposed method.
부산지역 다매체 육상환경 중 다환방향족탄화수소의 분포특성
김기용 ( Ki Yong Kim ),김언정 ( Un Jung Kim ),정태욱 ( Tae Uk Jung ),최성득 ( Sung Deuk Choi ),오정은 ( Jeong Eun Oh ) 한국환경분석학회 2015 환경분석과 독성보건 Vol.18 No.2
In this research, 16 US-EPA priority PAHs were analyzed to identify their concentrations and congener distribution profiles of various media in Busan. Samples were collected from the major terrestrial media: freshwater (18 points), soil (20 points), and pine needle (12 points). The levels of Σ16PAHs in soil, water, and pine needle samples ranged from 0.027 to 2,071 μg/kg dw (mean: 113.9 μg/kg dw), 25.1 to 2,665 ng/L (mean: 201ng/L), and 0.680 to 87.05 μg/kg (mean: 9.981 μg/kg), respectively. Different levels and patterns of PAHs were observed with the land use of sampling sites. PAH profiles were compared by principal component analysis (PCA) and diagnostic ratios to observe the influences of various pollution sources. Heavily contaminated sites were directly influenced by different pollution sources. For example, more contaminated soil samples had petrogenic PAHs mostly, whereas highly contaminated pine needle samples contained pyrogenic PAHs. This research could give useful basic data and appropriate analysis procedures of multimedia for probabilistic exposure assessment of organic pollutants in Korea.
진공관형 태양열 집열기의 흡수관 형상 변화에 따른 성능 비교
김용(Kim, Yong),서태범(Seo, Tae-Beom),윤성은(Yun, Seong-Eun),김영민(Kim, Young-Min) 한국신재생에너지학회 2006 신재생에너지 Vol.2 No.1
The thermal performance of glass evacuated tube solar collectors are numerically and experimentally investigated. Four different shapes of solar collectors are considered and the performances of these solar collectors are compared. Dealing with a single collector tube, the effects of not only the shapes of the absorber tube but also the incidence angle of solar irradiation (beam irradiation) on thermal performance of the collector are studied. However, the solar irradiation consists of the beam irradiation as well as the diffuse irradiation. Also, the interference of solar irradiation and heat transfer interaction between the tubes exist in an actual solar collector, These effects are considered in this study experimentally and numerically. The accuracy of the numerical model is verified by the experimental results. The result shows that the thermal performance of the absorber used a plate fin and U-tube is the best.
김용상(Kim Yong-Sang),고동환(Ko Dong-Hwan),은창수(Eun Chang-Soo),김백현(Kim back-hyun),윤용기(Yoon Yong-Ki) 한국철도학회 2008 한국철도학회 학술발표대회논문집 Vol.- No.-
To study the feasibility of applying wireless communication technology to the control of train for the effective control of train and for the reduction of cost and time to construct the necessary infra structure, we investigate into the application of the existing commercial WCDMA network to CBTC (communication-based train control) to grasp the obstacles and propose the solutions to circumvent them. The obstacles can be categorized into the hand-off problem, the interference problem near the stations, and the problem of radio shadow areas. We propose, as solutions, the cell overlap method and multi-terminal approach for the hand-off problem, the cell sectoring method for the interference problem, and establishment of new base stations along the railroad both to provide the wireless train control and communication service to the customers on the train which was otherwise impossible because of the shadowing effect.
김용은(Yong Eun Kim),장세용(Se Yong Jang),나동규(Dong Kyu Na),조규정(Kyu Jung Cho) 한국사회체육학회 2012 한국사회체육학회지 Vol.0 No.49
This study researched whether Korean Sport Association for the Disabled and 16 provinces` Sport Association for the Disabled has complied with the web accessibility f or welfare of the disabled through improvement of websites and contents. With KADO-WHA 3.0 program, Korean Web Content Accessibility Guideline 1.0(KWCAG 1.0), the websites were analyzed in terms of perceivable, operable, understandable, and robust from November 14 to 18, 2011. As a result, excepting Korean Sport Association for the Disabled(97.25%) and Sport Associations for the Disabled of Jeju Special Self-Governing Province(91.5%) and Daegu City(88%), websites of 14 provinces` associations were operated without alternatives in regards of guideline of KWCAG 1.0. Especially, excepting robust( 88.64%), perceivable(42.17%), operable(72,82%), and understandable(58.52%) were insufficient in web accessibility.
팬 아웃이 고정된 carry increment 덧셈기 설계 방법
김용은(Yong-Eun Kim),정진균(Jin-Gyun Chung) 대한전자공학회 2008 電子工學會論文誌-SD (Semiconductor and devices) Vol.45 No.2
가변 stage carry increment adder는 stage가 증가함에 따라 stage에서 계산되는 워드길이를 1비트씩 늘려줄 수 있으므로 속도는 O(√2n)에 근접한다. 하지만 stage의 비트가 늘어남에 따라 stage에 입력되는 캐리의 팬 아웃이 증가하게 되고 이로 인하여 속도가 느려진다. 본 논문에서는 stage의 입력 비트를 증가하여도 팬 아웃이 stage에 관계없이 고정될 수 있는 알고리즘을 제안하고 37비트 덧셈기를 레이아웃하여 시뮬레이션 결과를 비교하였을 때 면적은 40% 늘어나는 것에 비해 덧셈기의 속도가 75% 향상되었다. According to increment of stage, the speed of changeable stage Carry-increment adder can be close to O(√2n) because the word length which is computed in stage can be lengthened by 1 bit. But the number of stage bits is increased, fan-out of carry which is inputted in stage is increased. So the speed can be slow. This paper presents a new carry-increment adder design method to fix the number of fan-outs regardless of the number of stages. By layout simulation of 37-bit adder, the area can be increased up to 40%, but speed improvement up to 75% can be achieved, by the proposed method, compared with a conventional method.