디지털 시스템 설계를 위한 범용 하드웨어 보드개발

조윤석,김호찬 濟州大學校 情報通信硏究所 1998 情報通信硏究所論文集 Vol.1 No.-

This paper presents a dedicated general-purpose FPGA board on which a digital system is implemented without additional hardware efforts. The board provides several I/O interfaces which consist of LED block. 7-segment block, LCD block. memory block and input switch block. The maximum number of logic gate to be implemented on the board is 10,000 gates. Also. PC interface block and serial communication block which are used to communicate with external devices are incorporated onto the board. By implementing a Viterbi decoder for decoding a convolutional code with rate 1/2 and constraint length 3 on the board. we show that the board can be utilized in practical applications.

Near Infrared Extragalactic Background Light (NIR EBL) and High Redshift QSO

조윤석,임명신 한국천문학회 2007 天文學會報 Vol.32 No.1

효율적인 하드웨어 구조의 Viterbi Scorer를 이용한 실시간 격리단어 인식 시스템의 구현

조윤석,김진율,오광석,이황수,Cho, Yun-Seok,Kim, Jin-Yul,Oh, Kwang-Sok,Lee, Hwang-Soo 한국음향학회 1994 韓國音響學會誌 Vol.13 No.e2

HMM을 이용한 알고리즘은 대용량 음성인식 시스템을 비롯하여 많은 시스템에 적용되어 왔다. 음성인식 시스템을 범용의 프로세서들을 가지고 구현할 경우 많은 계산량과 데이터들로 말미암아 실시간의 성능을 얻을 수 없다. 따라서 실시간 음성인식을 위해서는 인식을 가속화 시키기 위한 전용 하드웨어를 개발하는 것이 요구되어진다. 본 논문에서는 HMM을 이용한 격리단어 인식 시스템을 구현하는 내용을 다루고 있다. 음성인식 시스템은 호스트 컴퓨터와 DSP 보드 그리고 프로토타입 Viterbi scoring 보드로 이루어져 있다. 음성신호로부터 특징 벡터를 추출하는 과정은 DSP 보드에서 이루어지고, Viterbi scoring 보드는 세 개의 field-programmable gate array 칩들을 사용하여 설계되었다. Viterbi scoring 보드는 하드웨어적으로 효율적인 Viterbi scoring 구조를 채택하고 있고 음성인식을 위한 Viterbi 알고리즘을 수행한다. 제작된 시스템은 10MHz로 동작하고, 한 프레임 즉 10ms 동안에 100.000 스테이트를 처리할 수 있다. Hidden Markov Model (HMM)-based algorithms have been used successfully in many speech recognition systems, especially large vocabulary systems. Although general purpose processors can be employed for the system, they inevitably suffer from the computational complexity and enormous data. Therefore, it is essential for real-time speech recognition to develop specialized hardware to accelerate the recognition steps. This paper concerns with a real-time implementation of an isolated word recognition system based on HMM. The speech recognition system consists of a host computer (PC), a DSP board, and a prototype Viterbi scoring board. The DSP board extracts feature vectors of speech signal. The Viterbi scoring board has been implemented using three field-programmable gate array chips. It employs a hardware-efficient Viterbi scoring architecture and performs the Viterbi algorithm for HMM-based speech recognition. At the clock rate of 10 MHz, the system can update about 100,000 states within a single frame of 10ms.

생인공간 시스템을 위한 3차원 고분자 기질의 개발

조윤석,강인규,T. Akaike 한국고분자학회 2000 한국고분자학회 학술대회 연구논문 초록집 Vol.2000 No.10

HMM을 이용한 격리단어 인식 시스템에서 Viterbi Scoring을 위한 아키텍쳐 ( Architecture for The Viterbi Scoring in HMM-Based Isolated Work Recognition Systems )

조윤석,김진율,윤순영,이황수,이철동 대한전자공학회 1990 대한전자공학회 학술대회 Vol.1990 No.1

도시폐수처리장의 활성슬러지에서 분리한 Aniline 분해세균 Delftia sp. JK-2의 특성연구

조윤석,강형일,장효원,오계현 한국미생물학회 2000 미생물학회지 Vol.36 No.2

도시폐수처리장의 활성슬러지 표본으로부터 유일 탄소원 및 질소원으로 aniline을 이용할수 있는 미생물 컨소시엄을 농화배양하였다. 농화배양으로부터 분리된 3개의 분해세균 가운데 분해능이 탁원한 세균을 본 연구에 사용되었다. 분리세균운 그람 음성세균으로서 여러 가지 생리.생화학적 시험을 통하여 Delftia acidovorans로 동정되었으며 이를 Delftia sp. JK-2로 명명하였다. 10mM의 aniline이 포함된 액체배지에 Delftia sp. JK-2를 접종한 결과 24시간 이내에 aniline이 완전히 분해되엇다. 이 가간동안 배양액 내에 $NH_4^+$이온은 일시적으로 생성되었다가 aniline이 완전히 분해됨에 따라 완전히 사라졌다. Aniline을 포함하여 무기배지에 부가탄소로서 glucose를 첨가하였을 때 분해능은 크게 감소하였다. 질소원으로서 0.5% nitratef,f 첨가하였을 때 첨가하지 않은 대조군에 비해 anline의 분해가 80% 이상 향상되었다. Aniline 분해세균의 16S rDNA 염기서열을 이용하여 phylogenetic 분석을 실시한 결과 이 세균은 Delftia acidovorans와 96%의 유사성을 나타내었으며, Acidovorax, Aquaspirllum, Xylophilus, Variovorax, Rhodoferax 등의 세균과도 상당한 유사성을 나타내었다. Activated sludge samples were collected from a municipal sewage treatment plant and used for enrichment of microbial consortia with aniline as the sole carbon and nitrogen source. Threc aniline-degrading bacteria were obtained lrom microbial consortia and an isolate which has excellent aniline degradability was selected for this study. The isolate was Gram-negative, and identified and designated as Delfha sp. JK-2 on the basis of various physiological and biochemical tests. 10 mM aniline was completely degraded within 24 hours after inoculation of the culture. Ammonium ion was liberated in the medium transiently during the incubation and disappeared when aniline was completely degraded. Addition of glucose as a supplementary source to aniline minimal media showed significant decrease in aniline degradat~on rate for the strain Effective degradation of aniline was achieved by the addition of 0.5% nitrate as a nitrogen source, and resulted in approximately 80% higher aniline degradation compared to the absence of nitrate. Phylogenetic analysis based on 16s [DNA sequence revealed that the strain was closely related to De@ia acidovorans, with 96% overall similarity. The 16s [DNA sequence of JK-2 was also found to be closely related to those of six other clonal types, including Acidovoru, Aquaspirillum. Xylophilus, Variovorm, and Rhodofernr.

Burkholderia cepacia YK-2에서 페녹시계 제초제 2,4-Dichlorophenoxyacetic Acid에 의한 스트레스 충격 단백질 DnaK와 GroEL의 생성

조윤석,박상호,김치경,오계헌,Cho, Yun-Seok,Park, Sang-Ho,Kim, Chy-Kyung,Oh, Kye-Heon 한국미생물학회 1999 미생물학회지 Vol.35 No.4

환경오염원으로서 페녹시계 제초제인 ,2,4-D(2,4-dichlorophenoxyacetic acid)에 노출된 토양으로부터 분리된 세균인 Burkholderia cepacia YK-2에서 2,4-D에 의한 스트레스 충격 단백질의 생성을 조사하였다. 활발하게 생장을 하고 있는 B. cepacia YK-2의 배양은 다양한 농도의 2,4-D에 노출되어 스트레스 충격단백질을 생성하였다. 이 반응은 43kDa의 DnaK와 41kDa의 GroEL 단백질의 생성을 수반하였으며, 이 단백질들은 anti-DnaK 단일 항체와 anti-GroEL 단일 항체를 사용한 SDS-PAGE과 Western blot을 통하여 확인되었다. 생성된 총 스트레스 충격 단백질은 2-D PAGE 에 의하여 분석되었다. 다양한 2,4-D농도와 노출 시간에 따른 B. cepacia YK-2의 생존율을 분석한 결과, 이 세균의 생존율은 스트레스 충격 단백질의 생성과 비례하였다. Production of stress shock proteins in Burkholderia cepacia YK-2 in response to the phenoxyherbicide 2,4-dichlorophenoxyacetic acid(2,4-D) as an environmental contaminant was investrigated. The stress schock proteins were synthesized at different 2,4-D concentrations in exponentially growing cultures of B. capacia YK-2. This response involved the production of 43kDa and 41kDa GroEL proteins. The proteins were characterized by SDS-PAGE and Western blot using the anti-DnaK nad anti-GroEL monoclonal antibodies. Total stress shock proteins were analyzed by 2-D PAGE. Survival of B. cepacia YK-2 with time in the presence of different concentrations of 2,4-D was monitored, and viable counts paralleled the production of the stress shock proteins in this bacterium.

우리 나라 綜合貿易商社의 問題点과 機能强化方案

趙潤錫 동국대학교 경영대학원 1978 經營論叢-東國大學校 經營大學院 Vol.3 No.-

Returnee Directors in Korean Firms: Drivers and Influence

조윤석,이지환 한국전략경영학회 2014 전략경영연구 Vol.17 No.1

An increasing proportion of students from emerging developing economies study overseas in economically and academically advanced regions such as North America and Western Europe before returning to their home countries to pursue academic or management careers. This paper focuses on international returnees as board members in major Korean corporations and empirically examines whether the presence of returnee directors is the effect or the cause of corporate behaviors or status in terms of export orientation, R&D intensity, and foreign ownership. Largely building on upper echelons theory and incorporating perspectives from theories of resource dependence, signaling effects, and organizational legitimacy, we develop and test hypotheses regarding the antecedents and the influence of returnee directors in large Korean firms. Our results partially supported the hypotheses that firms with stronger export orientation, R&D expenditure over sales, and foreign ownership have more returnee directors in their boards. We also found evidence that a higher proportion of returnee directors on a board was positively associated with R&D intensity and foreign ownership of the firm.

오염된 토양으로부터 분리된 Burkholderia cepacia에 의한 2,4-D의 미생물학적 분해

오계헌,조윤석 순천향대학교 기초과학연구소 1999 순천향자연과학연구 논문집 Vol.5 No.1

Mixed cultures capable of utilizing 2,4-D (2,4-dichlorophenoxyacetic acid) as the sole carbon and energy source were enriched from contaminated soils which had a previous history of annual 2,4-D application. Among six strains isolated from the mixed cultures, the isolate which had an excellent 2,4-D degradability was selected. Morphological observation and various physiological characterization were performed for the isolate. MIS (microbial identification system) was used for the identification of the isolate, and assigned as Burkholderia cepacia. Complete degradation of 2,4-D was achieved in the experiment within 28 hours of incubation. 2,4-DCP(2,4-dichlorophenol) was produced as a metabolite during 2,4-D degradation. For the analyses of 2,4-D and 2,4-DCP, HPLC and UV-spectrophotometer were used in this study.