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단일포톤계수형 센서를 위한 CMOS readout 설계
황윤금(Yoon-Geum Hwang),전성채(Sungchae Jeon),김봉회(Bonghoe Kim),송광섭(Kwang-Soup Song),이동훈(Donghoon Lee),허영(Young Huh),하판봉(Pan-Bong Ha),김영희(Young-Hee Kim) 대한전기학회 2009 정보 및 제어 심포지엄 논문집 Vol.2009 No.10
본 논문에서는 의료용 x-선 영상검출을 위한 단일 포톤계수형 망식의 readout을 설계하고 개발한 내용에 대해 논하였다. 포톤계수형 readout 방식은 기존의 x-선 검출 방식(Charge integrating)과는 다르게, 입사되는 개개의 포톤을 계수하여 검출하는 방식이다. 미세한 x-선 신호를 검출하기 위하여 저 잡음 특성과 10?(㎐/㎟) 이상의 counting rate가 요구되어진다. 구현된 각 픽셀은 포톤계수형 동작을 위하여 Preamplifier, Discriminator, Counter,로 구성 되어져있다. Preamplifier는 자체바이어스 Folded cascode OPAMP를 채용한 CSA(Charge Sensitive Amplifier)로 구현하였고, 광자의 신호를 구분하기 위한 Discriminator는 칩 내외부에서 입력할 수 있도록 설계하였다. Counter는 신호의 펄스를 계수하는 counting mode와 저장된 데이터를 외부로 출력하는 readout (shift register)의 동작을 수행한다. 이러한 동작 수행을 위하여 고속 동작이 가능하며 layout 면적이 작은 LFSR(Linear Feedback Shift Resister) counter를 이용하여 설제하였다. 설계된 포톤계수형 readout는 100㎛×100㎛ 픽셀크기, 50㎛×50㎛ bump bonding용 패드, 15bit counting bit, 32×32개의 픽셀로 이루어져 있으며, 4-metal 0.18㎛ triple-well CMOS 공정을 이용하여 제작하였다.
허영(Young Huh),전성채(Sungchae Jeon),이동훈(Dong Hoon Lee),김봉회(Bonghoe Kim),황윤금(Yoon Geum Hwang),서창우(Changwoo Seo),차보경(Bo Kyung Cha),마미연(Mi Yeon Ma) 대한전자공학회 2010 대한전자공학회 학술대회 Vol.2010 No.6
Our imaging system called 3D CT(Computed Tomography)-fluoroscopy system which has developed through our project is a mobile x-ray system designed for interventional radiology to assist physician and diagnostic evaluation. Traditionally, spine surgery patients have had preoperative imaging procedures such as CT scans, MRIs, and x-ray to provide diagnostic information to the surgeon. Especially, 2D-fluoroscopy using C-arm has been the standard work horse for intra-operative spine and orthopedic imaging for decades, among other. But x-rays with conventional C-arm show only 2D fluoroscopy image during surgery. Compared to these, CT-fluoroscopy system provide a 2D real time image(fluoroscopy-like) and 3D image of spinal anatomy(CT-like). The system uses a state-of-the-art flat-panel detector as x-ray detection and cone-beam based CT realization. The authors provide some introduction of development of this technology.
화자확인에서 일정한 결과를 얻기 위한 빠른 순시 확률비 테스트 방법
김은영(Kim Eunyoung),서창우(Seo Changwoo),전성채(Jeon Sungchae) 한국음성학회 2010 말소리와 음성과학 Vol.2 No.2
A new version of sequential probability ratio test (SPRT) which has been investigated in utterance-length control is proposed to obtain uniform response results in speaker verification (SV). Although SPRTs can obtain fast responses in SV tests, differences in the performance may occur depending on the compositions of consonants and vowels in the sentences used. In this paper, a fast sequential probability ratio test (FSPRT) method that shows consistent performances at all times regardless of the compositions of vocalized sentences for SV will be proposed. In generating frames, the FSPRT will first conduct SV test processes with only generated frames without any overlapping and if the results do not satisfy discrimination criteria, the FSPRT will sequentially use frames applied with overlapping. With the progress of processes as such, the test will not be affected by the compositions of sentences for SV and thus fast response outcomes and even consistent performances can be obtained. Experimental results show that the FSPRT has better performance to the SPRT method while requiring less complexity with equal error rates (EER).