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최문호,강승호,임형석,Choi, Mun-Ho,Kang, Seung-Ho,Lim, Hyeong-Seok 한국정보통신학회 2013 한국정보통신학회논문지 Vol.17 No.7
인간의 한쪽 염색체상에 나타나는 SNP의 서열인 일배체형을 식별해내면 효과적인 유전질병 연관검사를 할 수 있다. 일배체형 추론문제란 특정 집단의 유전자형 집합으로부터 집단에 속한 각 개체의 유전자형을 설명할 수 있는 일배체형 집합을 도출해내는 것을 말한다. 본 논문에서는 검약기반 일배체형 추론 문제에 대해 최종 결과에 기여하지 않는 일배체형 집합을 후보군에서 제외함으로써 일배체형 추론과정에서 탐색해야 할 후보 일배체형의 개수를 줄이는 사전처리 알고리즘을 제시한다. 제시된 알고리즘은 기존의 사전처리 알고리즘에 비해 매우 빠르게 수행되며, 제시된 사전처리 알고리즘의 결과를 적용한 일배체형 추론은 대다수의 경우에 최적해를 산출하고, 최적해를 산출하지 않는 경우에도 최적해의 일배체형 개수와 크게 차이나지 않음을 실험을 통해서 보인다. The identification of haplotypes, which encode SNPs in a single chromosome, makes it possible to perform a haplotype-based association test with diseases. Given a set of genotypes from a population, the process of recovering the haplotypes that explain the genotypes is called haplotype inference. We propose a new preprocessing algorithm for the haplotype inference by pure parsimony (HIPP). The proposed algorithm excludes a large amount of redundant candidate haplotypes by detecting some groups of haplotypes that are dispensable for optimal solutions. For the well-known synthetic and biological data, the experimental results of our method show that our method run much faster than other preprocessing methods. After applying our preprocessing results, the numbers of haplotypes of HIPP solvers are equal to or slightly larger than that of optimal solutions.
CMFF CMOS 인버터 타입 OTA를 이용한 Gm-C 필터 설계
최문호,김영석 한국전기전자재료학회 2010 전기전자재료학회논문지 Vol.23 No.4
In this paper, a Gm-C LPF utilizing common-mode feedforward (CMFF) CMOS inverter type operational transconductance amplifier (OTA) has been designed and verified by circuit simulations. The CMFF CMOS inverter OTA was optimized for wide input linearity and low current consumption using a standard 0.18 ㎛ CMOS process; gm of 100 μS and current of 100 μA at supplied voltage of 1.3 V. Using this optimized CMFF CMOS inverter type OTA, an elliptic 5th order Gm-C LPF for GPS specifications was designed. Gain and frequency tuning of the LPF was done by changing the internal supply voltages. The designed Gm-C LPF gave pass-band ripple of 1.6 dB, stop-band attenuation of 60.8 dB, current consumption of 0.60 mA at supply voltage of 1.2 V. The gain and frequency characteristics of designed Gm-C LPF was unchanged even though the input common-mode voltage is varied.
다중 표준 시스템을 위한 이득 곡선 제어기를 가진 가변이득 증폭기 설계
최문호,이원영,김영석,Choi, Moon-Ho,Lee, Won-Young,Kim, Yeong-Seuk 한국전기전자재료학회 2008 전기전자재료학회논문지 Vol.21 No.4
In this paper, variable gain amplifier(VGA) with a gain slope controller has been proposed and verified by circuit simulations and measurements. The proposed VGA has a gain control, gain slope switch and variable gain range. The input source coupled pair with diode connected load is used for VGA gain stage. The gain slope controller with switch can control VGA gain slope. The proposed VGA is fabricated in $0.18{\mu}m$ CMOS process for multi -standard wireless receiver. The proposed two stage VGA consumes min. 2.0 mW to max. 2.6 mW in gain control range and gives input IP3 of -3.77 dBm and NF of 28.7 dB at 1.8 V power supply under -25 dBm, 1 MHz input. The proposed VGA has 37 dB(-16 dB $\sim$ 21 dB) variable gain range, and 8 dB gain range control per 0.3 V control voltage, and can provide variable gain, positive and negative gain slope control, and gain range control. This VGA characteristics provide design flexibility in multi-standard wireless receiver.
Neutralization을 이용한 주파수 변환기 설계
최문호,최원호,김영석,Choi, Moon-Ho,Choi, Won-Ho,Kim, Yeong-Seuk 한국전기전자재료학회 2008 전기전자재료학회논문지 Vol.21 No.4
In this paper, a 2.4 GHz low-voltage CMOS double-balanced down-conversion mixer using neutralization technique has been proposed and verified by circuit simulations and measurements. The grounded source structure was used for low-voltage operation. The neutralization technique was used to improve a conversion gain. The proposed mixer is fabricated in $0.25{\mu}m$ CMOS process for a 2.4 GHz wireless receiver. The mixer consumes 1.94 mW and gives conversion gain of 5.66 dB, input IP3 of 0.7 dBm and P1dB of -11.2 dBm at 1.5 V power supply. Measured results for the designed mixer show improved conversion gain of 2.86 dB over conventional mixer of grounded source structure.
결합도와 격리도를 개선한 이중층 Re-entrant 마이크로스트립 방향성 결합기 설계
최문호,이진택,천동완,신철재 한국전자파학회 2003 한국전자파학회논문지 Vol.14 No.10
본 논문에서는 이중충 마이크로스트립 유전체 기판을 이용하여 결합도와 격리도를 개선한 방향성 결합기를 제안하고, 설계방법을 제시하였다. 제안된 구조는 re-entrant mode 방향성 결합기의 구조를 수정하여, 결합도를 향상시키기 위해 최하층의 접지면에 어퍼쳐를 적용시킨 형태이다. 또한, 부동도체에 슬릿을 적용함으로써 격리도, S$_{11}$에 대한 정재파비, 그리고 위상차 등에 서도 우수한 특성을 얻을 수 있었다. 그 결과, 제안된 re-entrant mode 방향성 결합기는 기존의 구조보다 약 1.5 dB 정도 높은 결합도를 가질 뿐 아니라 각각 20 dB 이상의 개선된 격리도와 S$_{11}$에 대한 정재파비를 가짐을 확인할 수 있었다. 또한 위상 특성에서도 우수한 특성을 가지므로, 이로부터 제안된 결합기는 강한 결합이 필요한 다단 결합기에 사용될 수 있을 것이다. In this paper, we proposed the directional coupler using two layer microstrip substrate which is improved coupling and isolation. Also, we notified a design method. Modified re-entrant mode coupler is the structure added to the aperture on the ground plane in order to improving the coupling value. And, by adding to slits on the floating conductor, this structure has good performance in isolation, VSWR according to S$\sub$11/, and phase difference. As a result, proposed re-entrant mode microstrip directional coupler has about 1.5 dB more higher coupling and 20 dB more higher isolation than conventional coupler. And because this coupler has good performance in phase difference, it can be used multi-section coupler.