MATLAB을 이용한 송전선로의 아크사고 검출 및 고장거리 추정 소프트웨어 개발에 관한 연구

金秉泉(Byung-Chun Kim),朴南沃(Nam-Ok Park),金東秀(Dong-Su Kim),金喆煥(Chul-Hwan Kim) 대한전기학회 2002 전기학회논문지A Vol.51 No.4

초청 총설 : 바이오에너지 및 바이오화학원료인 C4-C6 생산

김병천 ( Byung Chun Kim ),이성철 ( Sung Chul Yi ),상병인 ( Byoung In Sang ) 한국공업화학회 2011 공업화학 Vol.22 No.5

석유자원의 고갈이 에너지 및 화학원료물질로 재생 가능한 바이오매스의 이용성을 증가시키고 있다. 본 총설에서는 바이오에너지 및 바이오화학원료인 C4-C6 생산에 관해 논하고자 한다. 주요한 C4 물질인 n-butanol과 n-butyric acid를 다량 생산하는 미생물은 Clostridium tyrobutyricum, Clostridium beijerinckii, Clostridium acetobutylicum이다. 대표적인 C6 물질인 n-hexanoic acid는 Clostridium kluyveri와 Megasphaera elsdenii가 다량 생산한다. 미생물 발효에 의해 보고된 n-butanol, n-butyric acid, n-hexanoic acid의 최대 생산량은 각각 21, 55, 19 g/L이었다. 배양과정에서 이들 생산물의 제거는 최종산물억제의 감소로 미생물에 의한 n-butanol, n-butyric acid, n-hexanoic acid의 생산량을 증가시켰다. 특히 C6 물질인 n-hexanoic acid는 n-hexanol로 될 수 있는 고 부가가치 물질로 생물학적 생산 연구가 꾸준히 진행 중인데, 신규한 미생물인 Clostridium sp. BS1은 galactitol을 이용하여 5 g/L의 n-hexanoic acid를 생산하였다. Depletion of petroleum increased the need of alternative energy and chemical resources. Biomass, a renewable resource, can be transformed to bioenergy and biomaterials, and the materials from biomass will ultimately substitute petroleum based energy and chemical compounds. In this perspective, production of C4-C6 compounds for bioenergy and biomaterials are described for understating of current research progress. n-Butanol and n-butyric acid, the major C4 compounds, are produced by Clostridium tyrobutyricum, Clostridium beijerinckii, and Clostridium acetobutylicum. n-Hexanoic acid, a typical C6 compound, is produced by Clostridium kluyveri and Megasphaera elsdenii. Reported maximum amount of n-butanol, n-butyric acid and n-hexanoic acid was 21, 55, and 19 g/L, respectively, and extraction of these C4-C6 compounds are induced increase production by those anaerobic bacteria. In addition, a new bacterium Clostridium sp. BS-1 produced 5 g/L of n-hexanoic acid using galactitol.

유기성 폐기물을 이용한 연료용 알코올의 생산

김병천,박재연,엄영순,상병인,정윤철,Kim, Byung-Chun,Park, Jae-Yeon,Um, Young-Soon,Sang, Byoung-In,Chung, Yun-Chul 대한환경공학회 2008 대한환경공학회지 Vol.30 No.9

수술 전 관상피내암으로 진단되었던 환자에서 침윤성 유방암이 발견될 위험 인자

신선형(Sun Hyoung Shin),김병천(Byung Chun Kim),송영주(Young Ju Song),윤현철(Hyun Chul Yoon),조진성(Jin Seong Cho),박민호(Min Ho Park),윤정한(Jung Han Yoon),제갈영종(Young Jong Jegal) 대한외과학회 2011 Annals of Surgical Treatment and Research(ASRT) Vol.80 No.2

Purpose: Ductal carcinoma in situ (DCIS), unlike invasive ductal carcinoma, does not require sentinel lymph node biopsy or axillary lymph node dissection because the possibility of axillary lymph node metastasis is low. However, occasionally, despite preoperative diagnosis of DCIS, invasive ductal carcinoma can be diagnosed by postoperative biopsy. Therefore, a study of the associated risk factors is necessary. Methods: 198 patients with an initial diagnosis of DCIS, treated between February 2005 and December 2009, were retrospectively analyzed. Associations between clinical and pathologic factors were analyzed for significance using univariate and multivariate analyses. Results: Of the 198 patients, 57 (28.8%) were found to have invasive disease on final pathology. Multivariate analysis revealed 4 independent predictors of invasive cancer upon final pathology: diagnosis by needle biopsy (OR, 3.165; P=0.008), positive p53 on preoperative biopsy (OR, 2.494; P=0.019) DCIS size (>2 ㎝) on microscopic finding (OR, 2.683; P=0.014), and relatively young age (OR, 0.958, P=0.046). Of the 13 patients with positive axillary lymph nodes, 11 (84.6%) were shown to have invasive cancer on final pathology (P<0.001). Conclusion: In cases of preoperative diagnosis based on needle biopsy, positive p53, large tumor, and relatively young age, an SLNB procedure can be considered because in almost 30% of the patients an invasive carcinoma is found after surgery.

호스트 ID 기반 통신을 위한 기본 MOFI 테스트베드 구축

정희진(Whoi Jin Jung),민석홍(Seok Hong Min),이재용(Jae Yong Lee),김병천(Byung Chul Kim) 大韓電子工學會 2011 電子工學會論文誌-TC (Telecommunications) Vol.48 No.7

최근 들어 미래인터넷에 대한 관심과 연구가 활발히 진행 중에 있다. 국내에서도 미래인터넷 연구의 한 분야로서 이동성 및 무선 환경 위주의 네트워크 환경으로의 변화에 초점을 맞춘 미래인터넷 아키텍처로 MOFI 가 제안되었다. MOFI 는 Mobile Oriented Future Internet 의 약자로 name 기반의 통신을 제공하며 라우팅 scalability 가 보장되고 이동성이 제공되는 데이터 전달 구조이다. 본 논문에서는 MOFI 구조 연구의 일부분으로 HID 기반 통신을 지원하는 기본 MOFI 테스트베드를 구축하고, 기본적인 인터넷 서비스 (PING, WWW)의 실험을 통해 HID 기반의 통신 가능성을 검증하였다. 테스트베드를 구축함에 있어 VirtualBox 라는 가상 머신을 사용하였고, 또한 Click Modular Router를 사용하여 패킷 처리 및 HCP 헤더의 추가 및 변환을 구현하였다. In recent years, the interest and research for Future Internet are rapidly increasing. In domestic, MOFI (Mobile Oriented Future Internet) is proposed as one architecture of Future Internet. MOFI is a data transmission architecture which provides a mobility, name-based communication and routing scalability. In this paper we implement a basic MOFI testbed that supports HID-based communication, and verify the feasibility of HID-based communication through experimentation of general service such as PING and WWW service. We used “VirtualBox” as a virtual machine and implement a packet processing and a HCP header addition and translation function using “Click Modular Router”.

Internal Transcribed Spacer 1 부위의 염기서열 분석을 통한 피부사상균의 계통발생 및 분류

김병천,김정철,서무규 대한피부과학회 2000 대한피부과학회지 Vol.38 No.9

Background: The species of dermatophytes have been identified and classified by morphological and biochemical characterization as well as by mating experiments. But these techniques are either time consuming or lacking specificity. Recently molecular analysis has been introduced to the field of medical mycology. Objective: We investigated the phylogeny and taxonomy of the dermatophytes using sequence analysis of the ribosomal intemal transcribed spacer 1 (ITS1) region. Methods: 15 species of dermatophytes (6 strains of T. rubrum, 4 strains of T. meetagrophytes subtypes, M. canis, M. gypseum, E. floccosum, T. verrucosum, and T. tonsurans) were cultured on Sabouraud dextrose broth and their DNA was extracted by bead-beating method. Cloning and sequencing of PCR product was done. Results: The size of specific bancls among dermatophytes was 340 bp in ITS1 region. Phylogenetic analysis of sequences reveaied that 6 strains of T. rubrum showed genetically identical patterns in intraspecies, but subtypes of T. mentagrophytes were different. The other dermatophytes showed different patterns in interspecies. The following taxonomy were so closely related: granular form of T. mentagrophytes and T. tonsurans; powdery form, persicolor form and downy form of T. mentagrophytes; and M. gypseum and E. floccosum. Conclusion: The phylogenetic analysis of ITS1 region provided useful information for classification and understanding the evolution of dermatophytes species.

EMTP MODELS를 이용한 2차 아크 모델링 기법에 관한 연구

안상필,김병천,김철환 成均館大學校 科學技術硏究所 1998 論文集 Vol.49 No.2

The most frequent faults on overhead transmission lines are single-phase to ground arc faults in air. On HV/EHV lines, the single-phase autoreclosure is an effective means to clear the fault while retaining the system stability. For the improvement of an adaptive SPAR(Single-Phase Auto-Reclosure) and novel protection schemes, it is important to simulate arc faults. But, it is difficult to reproduce the real arc behaviour, i.e. the extinction phenomenon exactly by computer simulations due to extremely random behavior of secondary arc. For simplicity of simulation processing, a simulation language, called MODELS, is used. It has been added to the EMTP, which permits to interface control system with power system. This paper proposes a new computer modeling techniques for the primary and the secondary arc separately, which can be implemented with EMTP MODELS routine, and the the performance of the proposed model is simulated on a typical 154 [kV] korean transmission line system.

Chitin Synthase 1 유전자의 염기서열 분석을 통한 피부사상균의 계통발생 및 분류

서무규,김병천,김정철 대한의진균학회 2000 대한의진균학회지 Vol.5 No.2

Background: The species of dermatophytes have been identified and classified by morphological and biochemical characterization as well as by mating experiments. But these techniques are either tiome consuming or lacking specificity. Recently molecular analysis has been introduced to the field of medical mycology. Objective: We investigated the phylogeny and taxonomy of the dermatophytes using sequence analysis of the chitin synthase 1 (CHS1) gene. Methods: 15 species of dermatophytes (6 strains of T, rubrum, 4 strains of T. mentagrophytes subtypes, M. canis, M. gypseum, E. floccosum, T. verrucosum, and T. tonsurans) were cultured on Sabouraud dextrose broth and their DNA were extracted by bead-beating method. Cloning and sequencing of PCR product were done. Results: The size of specific bands among dermatophytes was 615 bp in CHS1 gene. Phylogenetic analysis of sequences revealed that 6 strains of T. rubrum showed genetically identical pattern in intraspecies, but subtypes of T. mentagrophytes were different. The other dermatophytes showed different pattern in interspecies. Conclusion: The phylogenetic analysis of CHS1 gene provided useful information for classification and understanding the evolution of dermatophytes species. [Kor J Med Mycol 5(2): 51-59]