임펄스 UWB 네트워크에서의 일정진폭 다중접속 채널코딩

김동석(Tongsok Kim),김용철(Yong Cheol Kim) 대한전자공학회 2008 電子工學會論文誌-SC (System and control) Vol.45 No.6

이 논문은 임펄스 UWB 시스템을 위한 새로운 일정진폭 프리코딩을 제안한다. IEEE 802.15.4a 표준에 따르면 임펄스 UWB는 실내측위와 센서 데이터 전달에 사용될 수 있다. 대부분의 USN(ubiquitous sensor network)은 다중접속을 필요로 한다. 그러나 UWB 시스템은 다중접속으로 야기되는 중첩신호를 검출하는데 있어 제약성이 있다. 이를 극복하기 위하여 Wada 및 Kim의 CAMC(constant amplitude multi-code) 개념을 응용하였다. 제안하는 시스템은 체계적 일정진폭 프리코딩과 LDPC 디코딩으로 구성된다. 또한 컴퓨터 시뮬레이션을 통하여 BER 성능이 우수함을 확인하였다. In this article a novel constant amplitude precoding for impulse UWB system is proposed. According to IEEE 802.15.4a, impulse UWB can be used in indoor localization and sensor data transmission. Most USN(ubiquitous sensor networks) needs multiple access. However impulse UWB system has a limited capability to detect superpositioned signal induced by multiple access. To overcome this problem we have adopted the concept of CAMC(Constant Amplitude Multi-Code) deviced by Wada and Kim. The proposed system consists of systematic constant amplitude precoding and LDPC decoding. And this system shows a good BER performance in computer simulation.

유방암의 Imprint 표본에서 p53 단백 발현

김동석,이은희,김기권,김미진,이수정,Kim, Dong-Sug,Lee, Eun-Hi,Kim, Ki-Kwon,Kim, Mi-Jin,Lee, Soo-Jung 대한세포병리학회 1995 대한세포병리학회지 Vol.6 No.1

This study was carried out to determine the usefulness of imprint cytology for detecting p53 protein in breast carcinoma. NCL-DO7 (Novocastra, U.K.) was used to detect p53 protein immunocytochemically. A total of 33 cases was studied, Immunostaining of imprint cytology with NCL-DO7 was positive in 64% (21/33) and showed relatively high coincident rate (80%) with immunostaining of formalin-fixed, paraffin-embedded specimen p53 protein was related to negative estrogen receptor status, but not to the nuclear grade, lymph node metastasis, or tumor size. The fact that p53 protein expression was not related to nuclear grade might be due to predominance of nuclear grade 3. It was easier to determine the nuclear grade is one of the most important prognostic factors, in imprint cytology than in tissue specimen. p53 protein tended to be stained more strongly in imprint cytology than in tissue. It is concluded that the application of imprint cytology in p53 protein detection can be performed easily, and that it may contribute to the evaluation of prognostic factors in breast carcinoma.

모야모야병에서 염기성 섬모 세포 성장 인자의 역할

김동석,최중언,김세혁,양국희,김현숙,Kim, Dong-Seok,Choi, Joong-Uhn,Kim, Se-Hyuk,Yang, Kook-Hee,Kim, Hyeun-Sook 대한신경외과학회 2001 Journal of Korean neurosurgical society Vol.30 No.1

Objectives and Importance : The present study investigated the levels of basic fibroblast growth factor(bFGF) in the CSF of patients with moyamoya disease and its clinical significance. Methods : The levels of bFGF in CSF, taken from 26 hemispheres of 14 moyamoya patients and 20 patients without vascular anomaly(control group), were measured by an enzyme-linked immunosorbent assay. We analyzed the correlation between the level of bFGF and the clinical factors such as age, onset pattern, development of neovascularization, and cerebral circulation. Results : The CSF of moyamoya patients contained a high concentration of bFGF to a significant extent. The bFGF level was apparently elevated in the patients in whom neovascularization from indirect revascularization, such as modified encephalo-duro-arterio-synangiosis(EDAS) was well developed. A linear correlation between the values of bFGF and clinical progression was noted. Conclusions : The elevation of bFGF in moyamoya disease seems to be specific. Clinically, the bFGF level may be considered a useful indicator to predict the efficacy of indirect revascularization.

유전체 장벽 방전 플라즈마 방전수의 특성과 미생물 소독에 관한 연구

김동석,박영식,Kim, Dong-Seog,Park, Young-Seek 한국환경보건학회 2012 한국환경보건학회지 Vol.38 No.2

Objectives: This experiment was carried out to elucidate the effect of discharged water on the disinfection of $Phytophthora$ $capsici$ and evaluate the water characteristics. Methods: The dielectric barrier discharges (DBD) plasma reactor system used in this study consisted of a plasma component [discharge, ground electrode and quartz dielectric tube], high voltage source, and air supply. The effects of water characteristics such as pH, ORP and conductivity and the disinfection effect of discharged water were investigated. Results: Experimental results showed that in the process of discharge, the pH decreased, whereas ORP and electric conductivity increased. When the discharge time was 30 min, $Phytophthora$ $capsici$ of 2.94 log was disinfected within 300 seconds. Disinfection performance of stored discharged water was maintained for three days; however the disinfection effect vanished after five days. When $Phytophthora$ $capsici$ was injected into the discharged water, the disinfection effect decreased after two days. Conclusions: It is considered that the main disinfection parameters of the discharged water were chemically active species such as $H_2O_2$ and $O_3$ and high ORP.

순환식 유전체 장벽 플라즈마 반응기를 이용한 수중 페놀 처리

김동석,박영식,Kim, Dong-Seog,Park, Young-Seek 한국환경보건학회 2012 한국환경보건학회지 Vol.38 No.3

Objectives: The purpose of this study was evaluating the applicability of the circulation dielectric barrier plasma process (DBD) for efficiently treating non-biodegradable wastewater, such as phenol. Methods: The DBD plasma reactor system in this study consisted of a plasma reactor (discharge, ground electrode and quartz dielectric tube, external tube), high voltage source, air supply and reservoir. Effects of the operating parameters on the degradation of phenol and $UV_{254}$ absorbance such as first voltage (60-180 V), oxygen supply rate (0.5-3 l/min), liquid circulation rate (1.5-7 l/min), pH (3.02-11.06) and initial phenol concentration (12.5-100 mg/l) were investigated. Results: Experimental results showed that optimum first voltage, oxygen supply rate, and liquid circulation rate on phenol degradation were 160 V, 1 l/min, and 4.5 l/min, respectively. The removal efficiency of phenol increased with the increase in the initial pH of the phenol solution. To obtain a removal efficiency of phenol and COD of phenol of over 97% (initial phenol concentration, 50.0 mg/l), 15 min and 180 minutes was needed, respectively. Conclusions: It was considered that the absorbance of $UV_{254}$ for phenol degradation can be used as an indirect indicator of change in non-biodegradable organic compounds. Mineralization of the phenol solution may take a relatively longer time than that required for phenol degradation.

분산객체그룹프레임워크 기반 모바일 협업 환경 및 적용에 관한 연구

김동석,정창원,주수종,Kim, Dong-Seok,Jeong, Chang-Won,Joo, Su-Chong 한국정보처리학회 2006 정보처리학회논문지D Vol.13 No.6

본 논문에서는 모바일 디바이스들 간에 협업을 제공할 수 있는 프레임워크를 제시하고, 그를 기반으로 헬스케어 응용 서비스를 구현하였다. 제안한 프레임워크는 3가지의 구성요소인 센서와 모바일 디바이스 그룹, 홈 서버의 상호작용을 위한 인터페이스를 정의하고, 고정형과 이동형 디바이스들(PDAs)을 이용한 협업 환경을 제시한다 이동형 디바이스들 간의 정보의 교환은 Push와 Pull 방식을 사용하였으며, 다수의 센서로부터 수집된 정보는 모바일 디바이스들과 홈 서버에 의해 공유 또는 교환한다. 우리의 협업 프레임워크는 이전 연구에서 개발된 분산객체그룹프레임워크(DOGF)에서 구현된 객체그룹관리, 정보저장, 접근제어에 따른 허가와 승인기능들을 응용 인터페이스를 통해 제공받게 된다. 헬스케어 서비스의 중요한 부분인 보안을 지원하기 위해 보안정보를 구분하였고, 정보의 이용 권한을 DOGF의 보안 객체를 통하여 인증할 수 있는 절차를 제시하였다. 또한, 사용자의 프로필 정보를 제공함으로써 사용자에 따른 서비스 객체에 대한 권한 검사를 하였다. 각 모바일 디바이스와 홈 서버에 구현된 컴포넌트는 TMO 스킴을 적용하였으며, 이들 분산된 컴포넌트들 간의 통신을 지원하기 위해 분산 실시간 미들웨어인 TMOSM을 사용하였다. 끝으로 협업 프레임워크 상에서 제시한 헬스케어 응용 시나리오의 수행성을 GUI를 통해 보였다. In this paper, we suggested a mobile collaboration framework for supporting mobile services among mobile devices, and designed and implemented on this environment. The suggested framework has three elements; groups of sensors and mobile devices(Fixed and Moving-typed PDAs) and a home server. We designed interfaces for interactions with each other in collaboration environment with three elements described above. The information collected by sensors can be share and exchanged by mobile devices or a home server in accordance with Push and Pull methods. This framework is based on the distributed object group framework(DOGF) we implemented before. Therefore the DOGF provides functions of object group management, storing information and security services to our mobile collaboration framework via application interfaces defined. The information collected by sensors is arranged according to user's security 'demands. And user profile information is used for checking authority of each service object. Each component for executing functions of mobile devices and a home server is implemented by TMO scheme. And we used the TMOSM for interactions between distributed components. Finally, we showed via GUI the executablity of a given healthcare application scenario on our mobile collaboration framework.

신상품소개-스프링클러설비의 신축배관

김동석,Kim, Dong-Seok 한국화재보험협회 1999 방재기술 Vol.26 No.-

실내공기질관련 국제규격의 KS 규격도입 현황

김동석,Kim, Dong-Seok 기술표준원 2005 기술표준 Vol.44 No.-

주거용 스프링클러의 소화특성에 관한 연구

김동석,Kim, Dong-Seok 한국화재보험협회 1999 방재기술 Vol. No.

해외기술 정보-속동형 스프링클러를 중심으로한 NFPA 설치기준 변화

김동석,Kim, Dong-Seok 한국화재보험협회 1997 방재기술 Vol.22 No.-