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사이즈 감소를 위한 이중대역 PIFA 안테나 설계 및 제작
임동철,박효달,Lim Dong-Cheol,Park Hyo-Dal 한국통신학회 2006 韓國通信學會論文誌 Vol.31 No.9A
본 논문에서는 $2.40{\sim}2.482GHz$ 와 $5.75{\sim}5.85GHz$ 대역의 무선 LAN용 PIFA(Planar Inverted F Antenna) 안테나를 설계 제작하였다. 패치의 사이즈 감소를 위해 hair-pin 구조와 short-pin 구조를 갖도록 하였으며, 접지면과 기판사이에 공기층을 삽입하여 VSWR<2.0에서 적절한 대역을 얻고자 하였다. 설계시 주요 파라미터는 hair-pin 길이, 폭, 위치와 공기층의 두께 및 급전위치였으며 최적화된 파라미터를 가지고 실제 제작 및 측정하였다. 제작된 안테나의 측정결과는 다음과 같다. 공진 주파수는 2.37GHz 와 5.86GHz이고, VSWR<2.0에서 각각 약 90MHz 와 350MHz의 대역폭을 얻었으며 $1.91{\sim}4.37dBi$의 이득을 얻었다. 2.4GHz에서 H-평면과 E-평면은 각각 $52.83^{\circ}$와 $85.90^{\circ}$로 나타났으며 5.8GHz에서 H-평면과 E-평면은 각각 $65.68^{\circ}$와 $52.143^{\circ}$로 나타났다. In this paper, PIFA antenna for $2.40{\sim}2.482GHz\;and\;5.75{\sim}5.85GHz$ is designed, fabricated, and measured. The prototype consist of hair-pin and short-pin. To obtain suitable bandwidth, the form layer is inserted between ground plane and substrate. Important parameters in the design are hair-pin length, width, position, air-gap height, and feed point position. From these parameters optimized, a PIFA antenna is fabricated and measured. The measured results of the antenna are obtained as follows results. The resonant frequency of the fabrication PIFA antenna is 2.37GHz and 5.86GHz bandwidth for approximately 90MHz with 350MHz(VSWR<2.0) and the gain is $1.91{\sim}4.37dBi$. H-plan and E-plan at 2.4GHz and 5.8GHz are shown as $52.83^{\circ},\;85.90^{\circ}\;and\;68.68^{\circ},\;52.143^{\circ}$ respectively.
수동 광섬유정렬을 이용한 Nohermetic 플라스틱 패키지 광모듈
임동철,이원종,강석엽,박효달,Lim, Dong-Cheol,Lee, Won-Jong,Kang, Suk-Youb,Park, Hyo-Dal 한국통신학회 2006 韓國通信學會論文誌 Vol.31 No.11A
본 논문은 GE-PON 등 FTTH용 광액세스망 시스템에 사용되는 저가격 광모듈 제작을 위하여, 1.31/1.49um 양방향 구성의 하이브리드집적 PLC칩을 사용한 효율적인 광모듈 패키징 기술을 제안하였다. 수동 광섬유정렬기술과 nonhermetic 플라스틱 패키지 기술을 적용하여 광모듈을 제작하였으며, 광결합효율과 전기-광학적 특성을 측정하였다. 제작된 광모듈의 광결합효율은 광축정렬 허용오차 40um내에서 0.5dB이하의 광결합손실을 나타내었고, -24dBm 이하의 수신감도와 광출력 1.5mW이상, 소광비 10dB이상, tracking error 0.3dB이하의 온도특성이 GE-PON ONU용 광모듈 규격을 만족함을 확인하였다. In this paper, We proposed a efficient OSA(Optical Sub-Assembly) packaging method in use 1.31/1.49um bi-directional hybrid-integrated PLC chip for low-cost OSA in optical access network system applications as GE-PON in FTTH. Fabricated OSA with passive optical fiber alignment and nonhermetic plastic package method and measured optical coupling efficiency and electric-optical characteristics. Its performance is feasible to satisfy the GE-PON ONU specifications with the results as less than 0.5dB coupling losses within 40um alignment of z-axis and less than -24dBm sensitivity. It also has good temperature characteristics to sustain optical output power more than 1.5mW and 10dB extinction ratio, less than 0.3dB tracking error.
이족보행로봇의 걸음새 제어를 위한 지능형 학습 제어기의 구현
임동철(Dong-Cheol Lim),국태용(Tae-Yong Kuc) 대한전기학회 2010 전기학회논문지 P Vol.59 No.1
This paper presents an intelligent learning controller for repetitive walking motion of biped walking robot. The proposed learning controller consists of an iterative learning controller and a direct learning controller. In the iterative learning controller, the PID feedback controller takes part in stabilizing the learning control system while the feedforward learning controller plays a role in compensating for the nonlinearity of uncertain biped walking robot. In the direct learning controller, the desired learning input for new joint trajectories with different time scales from the learned ones is generated directly based on the previous learned input profiles obtained from the iterative learning process. The effectiveness and tracking performance of the proposed learning controller to biped robotic motion is shown by mathematical analysis and computer simulation with 12 DOF biped walking robot.
신병선,임동철,안규철,최병하,Shin, Byung-Seon,Lim, Dong-Cheol,An, Gyoo-Chul,Choi, Byung-Ha 대한전자공학회 1999 電子工學會論文誌, D Vol.d36 No.1
We proposed an efficient beam Propagation Method(BPM) algorithm for 3-D analysis, which can handle great amount of data on PC efficiently. The new algorithm, which is an expanded version of DuFort-Frankel algorithm for 3-D analysis, can reduce the number of computations for a given BPM analysis. The algorithm was applied to a rib-type directional coupler to find the same results as those from the coupled mode theory. 본 논문에서는 3차원의 연산을 위한 효율적인 3차원 광전파법을 제안하였다. 이는 기존의 2차원 구조에 많이 사용되었던 DuFort-Frankel법을 3차원으로 확장한 것으로서, 이 방법을 이용함으로써 광전파방법에서의 행렬연산의 횟수를 반으로 줄이여, 수치해석에 소요되는 시간을 최대 50%이상 감소시킬 수 있었다. 제안된 광전파법은 모드결합이론에 적용되었으며, 매우 정확한 결과를 얻었다.
Real-Time OS 기반의 로봇 매니퓰레이터 동력학 제어기의 구현 및 성능평가
高在源(Jaw-Won Kho),林東哲(Dong-Cheol Lim) 대한전기학회 2008 전기학회논문지 P Vol.57 No.2
In this paper, a dynamic learning controller for robot manipulator is implemented using real-time operating system with capabilities of multitasking, intertask communication and synchronization, event-driven, priority-driven scheduling, real-time clock control, etc. The controller hardware system with VME bus and related devices is developed and applied to implement a dynamic learning control scheme for robot manipulator. Real-time performance of the proposed dynamic learning controller is tested and evaluated for tracking of the desired trajectory and compared with the conventional servo controller.
지능형 제어기법 및 센서 인터페이스를 이용한 이족 보행 로봇의 동적보행 제어
高在源(Jaw-Won Kho),林東哲(Dong-Cheol Lim) 대한전기학회 2007 전기학회논문지 P Vol.56 No.4
This paper introduces a dynamic walking control of biped walking robot using intelligent sensor interface and shows an intelligent control method for biped walking robot. For the dynamic walking control of biped walking robot, serious motion controllers are used. They are main controlled using INTEL80C296SA MPU), sub controlled using TMS320LF2406 DSP), sensor controller(using Atmega128 MPU) etc. The used sensors are gyro sensor, tilt sensor, infrared sensor, FSR sensor etc. For the feasibility of a dynamic walking control of biped walking robot, we use the biped walking robot which has twenty-five degrees of freedom(D,O.F.) in total. Our biped robot is composed of two legs of six D.O.F. each. two arms of five D.O.F. each. a waist of two D.O.F., a head of one D.O.F.