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FlexRay 트랜시버 시스템의 Bus Driver(BD) 회로 제작 및 검증
조민형(Min-Hyeong Cho),이원호(Won-ho Lee),사의환(Yui-Hwan Sa),김진수,김희석(Hi-Seok Kim),차형우(Hyeong-Woo cha) 대한전자공학회 2015 대한전자공학회 학술대회 Vol.2015 No.11
Bus driver circuit of FlexRay transceiver system was fabricated and tested. the Bus driver circuit configured transmitter circuit and receiver circuit. In the verified circuit transmitter circuit, data0, data1, idle, and idle_lp are control signals decoded by a one-hot decoder and fed into the bus driver. Furthermore, a three comparator scheme is used to carry out bit slicing and state recognition at the receiver circuit end. The verified circuit was used as the Magna/Hynix 0.18㎛ process and supply voltage was 3.3V. As a result of chip test, It was confirmed the output waveform change according to the control signal. BD is normal operation to 500㎑. But, up to 500㎑, the output waveform is occurred distorted phenomenon.
초전형 적외선 센서 회전방식을 이용한 정지 인체 감지 시스템에 관한 연구
차형우(Hyeong-Woo Cha),조민형(Min-Yyeong Cho) 대한전자공학회 2016 전자공학회논문지 Vol.53 No.1
초전형 적외선(pyroelectric infrared : PIR) 센서를 이용하여 정지 및 이동인체 감지 시스템을 개발하였다. 감지 시스템은 전원부, 초전형 적외선 센서 인터페이스 회로, 극소형 스템핑 모터, 그리고 디지털 제어부로 구성된다. 정지된 인체를 감지하는 원리는 PIR 센서와 프레넬 렌즈(Fresnel lens)를 부착한 스템핑 모터를 180도로 6초 간격으로 회전하여 인체의 유무를 검출하고 일정기간 동안 인체 감지 신호가 없으면 모터를 정지시키는 것이다. 제안한 감지 시스템에 필요한 제어 알고리즘을 개발하였다. 실험을 통해 감지 시스템은 37℃의 정지 및 이동하는 인체에 대하여 6m의 감지거리와 30도의 감지 각도를 갖고 있다는 것을 확인하였다. A novel sensing system for standing and moving human body using PIR(pyroelectric infrared) sensor was development. The system consists of power supply, interface circuit of PIR sensor, small stepping motor, and digital control. The detecting principle for stop human body is detecting the human body when the stepping motor sticking the PIR sensor and the fresnel lens has rotated by 180 degree at six second and has stopped the motor for no detecting signal of human body. We developed control algorism for proposed the detection system. The experimentation shows that the detector system had detected length and angle were 6m and 30 degree against as standing and moving human body with 37℃.
유한요소법에 의한 자기공명영상시스템에서의 와전류 영향 분석
이정한,강현수,조민형,문치웅,이강석,이수열,Lee, Jeong-Han,Gang, Hyeon-Su,Jo, Min-Hyeong,Mun, Chi-Ung,Lee, Gang-Seok,Lee, Su-Yeol 대한의용생체공학회 1999 의공학회지 Vol.20 No.1
Eddy current in MRI systems degrades gradient field linearity and distorts gradient waveform. When the waveform distortion is spatially variant, it is very difficult to perform special imaging techniques such as the echo planar imaging technique or the fast spin echo imaging technique. In this study, we have developed a new technique to estimate the distorted gradient waveforms at any points inside the imaging region using the finite element method. After obtaining the eddy-current-effect transfer function, which represents magnitude and phase characteristics of the gradient field at a particular point, we have used the transfer function to estimate the actual gradient waveforms at the point. To verify the proposed technique, we have compared the estimated gradient waveforms with the measured ones. 자기공명영상시스템에서 경사자계코일에 전류 펄스를 인가할 때 코일 주변의 도전성 구조물에 유도되는 와전류는 경사자계의 선형성을 열화 시킬 뿐만 아니라 경사자계의 파형을 왜곡시킨다. 특히 경사자계 파형의 왜곡 정도가 공간 위치에 따라 다를 경우 고속촬영법과 같은 고성능의 자기공명영상법을 실현하는 것이 어려워 진다. 본 연구에서는 촬영 공간 내 임의의 지점에서 와전류에 의해 경사자계 파형이 변형되는 정도를 알 수 있는 방법을 유한요소법을 이용해 구하였다. 경사자계코일에 정현파를 인가했을 때 임의의 지점에서 자계의 진폭 및 위상 특성이 주파수에 따라 어떻게 변하는지를 나타내는 와전류 영향 전달함수를 구하였고, 이 전달함수를 이용해 임의의 입력 전류 파형에 대한 출력 경사자계 파형을 예측하였다. 제안한 방법의 타당성을 검증하기 위해 실제로 측정한 경사자계 파형을 예측한 파형과 비교하여 제시하였다.
이원호(Won-ho Lee),조민형(Min-Hyeong Cho),사의환(Yui-Hwan Sa),김진수,김희석(Hi-Seok Kim),차형우(Hyeong-Woo Cha) 대한전자공학회 2015 대한전자공학회 학술대회 Vol.2015 No.11
CAN transceiver for communication of car network was designed. Driver circuit consists of UVLO, temperature protect, driver, oscillator, Time out and receiver circuits. It provides CANH, CANL signals for CAN communication"s physical layer standard. Timeout circuit consists of 3bit binary counter using D flip-flop, OR gate and NOT gate. It protects the CAN bus against permanent blocking that TxD is continuously "low". The verified circuit was used as the Magna/Hynix 0.18㎛ process and supply voltage was 3.3V. As a result of chip test, waveform and value is correspond with simulation.
CMOS 트랜지스터로 구성된 온도 보상된 LDO Regulator 설계
김진수(Jin-Su Kim),사의환(Yui-Hwan Sa),이원호(Won-Ho Lee),조민형(Min-Hyeong Cho),차형우(Hyeong-Woo Cha),김희석(Hi-Seok Kim) 대한전자공학회 2015 대한전자공학회 학술대회 Vol.2015 No.6
A new temperature compensation LDO (low drop out) regulator configured CMOS transistors was designed. The proposed regulator circuit is consist of temperature compensation band gap reference and LDO. The simulation results that the proposed regulator has output voltage of 1.5V from 2.1V to 5.5V of supply voltage and temperature coefficient of 250ppm/℃ form ~ 20℃ to 140℃. The designed regulator for circuit simulation was used as the Magna/Hynix 0.35㎛ process and supply voltage was 5V.
윤정호 ( Jung Ho Yun ),정우진 ( Woo Jin Jeong ),장우성 ( Woo Sung Chang ),조민형 ( Min Hyeong Jo ),박종규 ( Jong Kyu Park ),이상진 ( Sang Jin Lee ),김영돈 ( Young Don Kim ),천갑진 ( Gab Jin Cheon ) 대한소화기학회 2013 대한소화기학회지 Vol.61 No.1
A 43-year-old man, who received total gastrectomy five years ago for advanced gastric cancer, underwent a screening colonoscopy and abdominal CT scan. Abdominal CT scan revealed no abnormal findings. Colonoscopy revealed polyps at the rectum, which were removed by polypectomy. The patient did not complain of abdominal pain or discomfort throughout the procedure. But, he developed right upper quadrant abdominal pain on the next day after colonoscopy. Abdominal CT scan revealed the distended gallbladder with mild wall thickening and suspicious sandy stones or sludge in the gallbladder. The patient underwent an open cholecystectomy. Pathology was compatible with acute cholecystitis. We should be aware of and consider cholecystitis in the differential diagnosis for patients with abdominal pain after colonoscopy. (Korean J Gastroenterol 2013;61:42-45)
수직형 프로브 카드 니들(neddle)의 저항 측정 시스템에 관한 연구
차형우,조민형 청주대학교 산업과학연구소 2016 産業科學硏究 Vol.33 No.2
Resistance measuring system of a vertical probe card probe needle was developed. The system consist of voltage measurement circuit using △∑24-bit ADC, constant current circuit using 12-bit DAC, a pad system to move the control mechanism using 5-phase stepping motor and z-stage, and interface circuits such as LCD, Key, RS232, switch circuit. The principle of resistance measurement was four-point method. The experiment result was that the voltage measurement circuit can measure up to 0∼0.5V. The constant current circuit supply a current range from 82mA to 140mA. The pad moving sensitivity to move the control mechanism was 0.74㎛/pulse. The resistance measurement system for probe card needle has a resistance measuring range of 0∼4Ω.