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PRML 신호용 저 전력 아날로그 병렬처리 비터비 디코더 개발
김현정,손홍락,김형석,Kim Hyun-Jung,Son Hong-Rak,Kim Hyong-Suk 대한전자공학회 2006 電子工學會論文誌-SD (Semiconductor and devices) Vol.43 No.6
DVD용 PRML신호를 디코딩할 수 있는 병렬 아날로그 비터비 디코더를 칩으로 제작하고 테스트 결과를 기술하였다. 병렬 아날로그 비터비 디코더는 기존의 디지털 비터비 디코더를 아날로그 병렬처리 회로를 이용하여 구현한 것으로, 전력 소모가 매우 적다는 장점이 있다. 본 연구에서는 제안한 순환형 아날로그 비터비 디코더 회로를 DVD의 PRML 신호 디코딩용으로 설계 제작하였고, 그 상세 설계 내용과 각 회로의 신호 특성을 분석하였으며, 이를 기반으로 향후 개선 사항을 기술하였다. 또한, 칩으로 제작된 회로가 동작하여 PRML용 신호가 잘 디코딩됨을 보였다. A parallel analog Viterbi decoder which decodes PRML signal of DVD has been fabricated into a VLSI chip. The parallel analog Viterbi decoder implements the functions of the conventional digital Viterbi decoder utilizing the analog parallel processing circuit technology. In this paper, the analog parallel Viterbi decoding technology is applied for the PRML signal decoding of DVD. The benefits are low power consumption and less silicon consumption. The designed circuits are analysed and the test results of the fabricated chip are reported.
서브 골 설정에 의한 아날로그 셀룰라 비선형 회로망 기반 동적계획법
김형석,박진희,손홍락,이재철,이왕희,Kim, Hyong-Suk,Park, Jin-Hee,Son, Hong-Rak,Lee, Jae-Chul,Lee, Wang-Hee 대한전기학회 2000 전기학회논문지 D Vol.49 No.10
A fast optimal path planning algorithm using the analog Cellular Nonlinear Circuits(CNC) is proposed. The analog circuits based optimal path planning is very useful since most of the optimal path planning problems require real time computation. There has already been a previous study to implement the dynamic programming with analog circuits. However, it could not be applied for the practically large size of problems since the algorithm employs the mechanism of reducing its input current/voltage by the amount of cost, which causes outputs of distant cells to become zero. In this study, a subgoal-based dynamic programming algorithm to compute the optimal path is proposed. In the algorithm, the optimal paths are computed regardless of the distance between the starting and the goal points. It finds subgoals starting from the starting point when the output of the starting cell is raised from its initial value. The subgoal is set as the next initial position to find the next subgoal until the final goal is reached. The global optimality of the proposed algorithm is discussed and two different kinds of simulations have been done for the proposed algorithm.
서울지역의 개와 고양이에서 분리한 Staphylococcus aureus의 항생제 감수성 및 multiplex PCR을 이용한 장독소의 검출
김능희 ( Neung Hee Kim ),채희선 ( Hee Sun Chae ),손홍락 ( Hong Rak Son ),김창기 ( Chang Ki Kim ),김선흥 ( Sun Heung Kim ),이정학 ( Jung Hark Lee ),김철훈 ( Chul Hun Kim ) 한국가축위생학회 2010 韓國家畜衛生學會誌 Vol.33 No.3
The antimicrobial susceptibility of 73 strains of Staphylococcus aureus isolated from dogs and cats was determined against 16 antimicrobial agents. All isolates were susceptible to cephalothin (CF), vancomycin (VA), rifampin (RA), quinupristin-dalfopristin (SYN) and linezolid (LZD), whereas more than 86.3% of the isolates were resistant to penicillin (P). In the case of enterotoxin production, 8.2% of 73 strains produced enterotoxin A and 1 strain produced enterotoxin C. Appropriate protocols for antimicrobial agents and strategies to reduce antimicrobial resistance will need to be investigated in the future.
수생조류에서 Clostridium botulinum type C에 의한 발증사례
채희선 ( Hee Sun Chae ),김능희 ( Neung Hee Kim ),손홍락 ( Hong Rak Son ),김창기 ( Chang Ki Kim ),김선흥 ( Sun Heung Kim ),이정학 ( Jung Hark Lee ) 한국가축위생학회 2009 韓國家畜衛生學會誌 Vol.32 No.4
Botulism in wild waterfowl has been reported in many areas of the world. In 18 October 2008 to 22, 101 dead wild ducks were found in Anyangcheon. 24 of dead birds were spotbill (Anas poeilorhyncha), 56 were Mallard (Anas platyrhynchos), 18 were green- winged teal (Anas carolinensis) and 3 were others. Clinical sign of the sick birds were flaccid paralysis of the neck. At autopsy, most birds had no specific lesions. Stomach is empty. In the mouse bioassay, Samples of serum and intestinal contents taken from 9 dead birds killed all the injected mice, and their toxicity was neutralized by the antitoxin against C. botulinum type C toxin.
서울지역 길고양이의 Toxoplasma 감염증 실태조사
김능희 ( Neung Hee Kim ),채희선 ( Hee Sun Chae ),한혜진 ( Hye Jin Han ),손홍락 ( Hong Rak Son ),김창기 ( Chang Ki Kim ),김선흥 ( Sun Heung Kim ),이정학 ( Jung Hark Lee ),김철훈 ( Chul Hun Kim ) 한국가축위생학회 2009 韓國家畜衛生學會誌 Vol.32 No.3
Toxoplasma gondii is one of the most common protozoa parasites of human and other warm-blooded animals. Cats and wild felidae play crucial roles in the epidemiology of toxoplasmosis. This study was performed to survey the prevalence of T. gondii infection among stray cats in the Seoul. A total of 422 stray cat blood samples were collected from Seoul area. Positive sera for T. gondii were identified in 56 samples (13.3%) exclusively via the latex agglutination test and the detection no antigen particles among seropositive samples by PCR. The overall infection rate of male stray cats (14.4%) presented as higher than that of female cats (10.7%). This study suggested that T. gondii is widespread in stray cats of Seoul area. It is needed to control urban stray cat population and to reduced the risk of zoonotic transmission of toxolasmosis to other animals and humans.
김능희 ( Neung Hee Kim ),채희선 ( Hee Sun Chae ),손홍락 ( Hong Rak Son ),강영일 ( Young Il Kang ),이정학 ( Jung Hark Lee ),김세곤 ( Se Gon Kim ) 한국가축위생학회 2011 韓國家畜衛生學會誌 Vol.34 No.4
Rabies virus is transmitted most commonly through a bite from an infected dog. Especially, stray dogs that are not excluded from contact with rabid wild animals can become rabies vectors. Therefore, serological survey of rabies virus from stray dogs in Seoul Metropolitan City was carried out in this study. To investigate prevalence of rabies antibodies in the stray dogs, serum samples were taken from 500 stray dogs between April and December 2010. Antibodies to rabies virus were detected by indirect ELISA. Of 500 tested sera, 147 (29.4%) were positive to rabies virus. Prevalence rates of rabies antibodies( PRRA) in northern and southern Han river region of Seoul were 26.4% and 33.2% respectively. PRRA in male and female dogs were 33.6% and 26.1% respectively. PRRA in less than 1 year, 1∼2 < years, 2∼3< years, 3∼5< years, 5∼10< years and over 10 years old dogs were 12.7%, 21.6%, 26.4%, 36.4%, 32.5% and 46.4%, respectively. These results indicates that antibody seroprevalence to rabies is still not enough to prevent rabies and rabies vaccination is required to enhance the seroprevalence in the dogs. To improve the situation, measures to raise public awareness of rabies and its prevention is needed. Also, reducing stray dogs and keeping companion animals from contact with wild animals are indispensable for the prevention of rabies.