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정상훈,이남호,Jeong, Sang-hun,Lee, Nam-ho 한국정보통신학회 2017 한국정보통신학회논문지 Vol.21 No.1
In this paper, we are proposing an optimal design of wideband pulsed type gamma-ray sensors. These sensors were manufactured based on the design results and after word electrical properties were analyzed. The sensor input parameters were derived on the basis of pulsed gamma-ray spectrum and time-dependent energy rate, and the output current which were derived on the basis of the sensor sensitivity control circuit. Pulsed gamma-ray sensors were designed using the TCAD simulators. The design results show that the optimal Epi layer thickness is 45um with the applied voltage 3.3V and the diameter is 2.0mm. The doping concentrations are as follows : N-type is an Arsenic as $1{\times}10^{19}/cm^3$, P-type is a Boron as $1{\times}10^{19}/cm^3$ and Epi layer is Phosphorus as $3.4{\times}10^{12}/cm^3$. The fabricated sensor was a leakage current, 12pA at voltage -3.3V and fully depleted mode at voltage -5V. A test result of pulsed radiation shows that the sensor gives out the optimal photocurrent. 본 연구에서는 광대역 펄스감마선 탐지센서 최적화 설계를 수행하고 설계결과를 기반으로 탐지센서를 제작하여 전기적 특성을 분석하였다. 탐지센서의 최적화 설계를 위해 펄스감마선의 시간에 따른 에너지 프로파일로 부터 입력 변수를 도출하고 탐지감도 제어회로를 통하여 출력전류 범위를 결정하였다. 도출된 변수를 바탕으로 N-type Epi Wafer 및 TCAD(Technology Computer Aided Design)로 설계하고 제작하였다. 제작된 탐지센서의 전기적 특성 분석 결과 -3.3V 전압에서 12pA의 누설전류와 -5V의 전압에서 완전 공핍화 되는 특성을 가짐을 확인하였다. 제작된 센서의 포항가속기연구소 TEST LINAC 시험결과 감마선 설정 선율의 펄스방사선에 대해 고감도의 광전류를 생성시킴을 확인하였다.
PCR을 이용한 식품 내 Salmonella 균주의 신속 검출방법
정상훈 ( Jeong Sang Hun ),김묘영 ( Kim Myo Yeong ),김현중 ( Kim Hyeon Jung ),김태운 ( Kim Tae Un ),유상렬 ( Yu Sang Lyeol ),김해영 ( Kim Hae Yeong ) 한국응용생명화학회 2003 Applied Biological Chemistry (Appl Biol Chem) Vol.46 No.3
This study was carried out to investigate the simple and rapid detection of Salmonella species in different kinds of food using PCR method. The specific primer sets (STN1 and STN2) was designed and utilized to amplify a 617 bp DNA fragment from Salmonella species. The sensitivity of PCR was 1 pg of purified template DNA or 10² cells from pure culture. The detection limit of Salmonella typhimurium on agarose gel electrophoresis was 10³~10⁴cells/g in the artificially contaminated food samples. These results suggested that this simple method could be applied to industrial fields for detection of Salmonella species in food.
과도방사선에 의한 CMOS 소자 Latch-up 모델 연구
정상훈(Sang-Hun Jeong),이남호(Nam-Ho Lee),이민수(Min-Su Lee),조성익(Seong-Ik Cho) 대한전기학회 2012 전기학회논문지 Vol.61 No.3
Transient radiation is emitted during a nuclear explosion. Transient radiation causes a fatal error in the CMOS circuit as a Upset and Latch-up. In this paper, transient radiation NMOS, PMOS, INVERTER SPICE model was proposed on the basisi of transient radiation effects analysis using TCAD(Technology Computer Aided Design). Photocurrent generated from the MOSFET internal PN junction was expressed to the current source and Latch-up phenomenon in the INVERTER was expressed to parasitic thyristor for the transient radiation SPICE model. For example, the proposed transient radiation SPICE model was applied to CMOS NAND circuit.. SPICE simulated characteristics were similar to the TCAD simulation results. Simulation time was reduced to 120 times compared to TCAD simulation.
디코더 면적을 줄이는 새로운 전류구동 셀 매트릭스 DAC 구조
정상훈(Sang-Hun Jeong),신홍규(Hong-Gyu Shin),조성익(Seong-Ik Cho) 대한전기학회 2009 전기학회논문지 Vol.58 No.3
This paper presents a novel current steering cell matrix DAC(digital-to-analog converter) architecture to reduce decoder area. The current cell matrix of a existing architecture is selected by columns and lows thermometer code decoder of input bits. But The current cell matrix of a proposal architecture is divided 2n by the thermometer code decoder of upper input bits and are selected by the thermometer code decoder of middle and lower input bits. Because of this configuration, decoder numbers have increased. But the gate number that composed of decoder has decreased.. In case of the designed 8 bit current steering cell matrix DAC, the gate number of decoder has decreased by about 55% in comparison with a existing architecture.
CMOS 0.18um 공정 단위소자의 방사선 영향 분석
정상훈(Sang-Hun Jeong),이남호(Nam-Ho Lee),이민웅(Min-Woong Lee),조성익(Seong-Ik Cho) 대한전기학회 2017 전기학회논문지 Vol.66 No.3
In this study, we analyzed the effects of TID(Total Ionizing Dese) and TREE(Transient Radiation Effects on Electronics) on nMOSFET and pMOSFET fabricated by 0.18um CMOS process. The size of nMOSFET and pMOSFET is 100um/1um(W/L). The TID test was conducted up to 1 Mrad(Si) with a gamma-ray(Co-60). During the TID test, the nMOSFET generated leakage current proportional to the applied dose, but that of the pMOSFET was remained in a steady state. The TREE test was conducted at TEST LINAC in Pohang Accelerator Laboratory with a maximum dose-rate of 3.16×10<SUP>8</SUP>rad(Si)/s. In that test nMOESFET generated a large amount of photocurrent at a maximum of 3.16 × 10<SUP>8</SUP>rad(si)/s. Whereas, pMOSFETs showed high TREE immunity with a little amount of photocurrent at the same dose rate. Based on the results of this experiment, we will progress the research of the radiation hardening for CMOS unit devices.
개선된 자동 주파수 보정회로를 이용한 광대역 클록 발생기 설계
정상훈(Sang-Hun Jeong),유남희(Nam-Hee Yoo),조성익(Seong-Ik Cho) 대한전기학회 2011 전기학회논문지 Vol.60 No.2
In this paper, a wideband clock generator using novel Automatic frequency calibration(AFC) scheme is proposed. Wideband clock generator using AFC has the advantage of small VCO gain and wide frequency band. The conventional AFC compares whether the feedback frequency is faster or slower then the reference frequency. However, the proposed AFC can detect frequency difference between reference frequency with feedback frequency. So it can be reduced an operation time than conventional methods AFC. Conventional AFC goes to the initial code if the frequency step changed. This AFC, on the other hand, can a prior state code so it can approach a fast operation. In simulation results, the proposed clock generator is designed for DisplayPort using the CMOS ring-VCO. The VCO tuning range is 350㎒, and a VCO frequency is 270㎒. The lock time of clock generator is less then 3us at input reference frequency, 67.5㎒. The phase noise is -109dBC/Hz at 1MHz offset from the center frequency. and power consumption is 10.1㎽ at 1.8V supply and layout area is 0.384㎟.
정상훈(Sang-hun Jeong),이상복(Sangbok Lee) 한국산학기술학회 2017 한국산학기술학회논문지 Vol.18 No.4
유도무기(정확히 유도탄)는 고가의 장비로서 발당 0억을 호가하며, 납품 후 장기간 저장되는 특성을 반영하여 설계되므로 내부 구성품은 물론 유도탄 자체도 매우 높은 신뢰도를 가지게 된다. 이러한 유도탄의 신뢰도는 샘플링 검사결과를 바탕으로 전체 모집단의 신뢰도를 추정하여야 하나, 개발 간에는 개발기간이나 일정, 비용 등의 현실적인 문제로 실제 검사보다 수학적 분석이나 가속수명시험 등을 이용하여 저장신뢰도를 예측한다. 그러나 개발 시 제시되는 저장신뢰도는 예측값으로 실제 저장신뢰도와는 차이가 있을 것임에도 불구하고, 현재 우리 군(軍)은 유도탄 개발시 예측된 저장신뢰도를 기준으로 저장관리(주기검사)를 실시하고 있다. 이에 본 연구는 우리나라에서 10년 이상 저장되어 데이터가 축척된 △△유도탄의 야전점검 데이터를 수집하여 실제 저장신뢰도를 분석하고 현재 실시되고 있는 검사주기의 타당성 검토와 실질적인 저장신뢰도 확인방법을 제시하고자 작성되었다. 최근 실시된 특별검사결과를 토대로 저장신뢰도를 분석한 바 검사주기는 18년 이상으로 연장 가능함이 확인 되었고, 이에 따라 검사주기의 재 설정 및 실질적인 저장신뢰도 확인 방법을 제안한다. The purpose of this study is to suggest a new inspection period of △△ guided missiles by analyzing their reliability using field data. The △△ guided missile has an inspection period of five years which was determined using prediction data during its development process. However, from the analysis of its field data, it was shown that the inspection period could be extended to more than 18 years. Based on this result, a policy is proposed to reevaluate the inspection period by means of practical reliability tests.