장거리 해저 광전송망 분산보상 설계 및 구현

유재덕(Jae Duck Yoo),박홍태(Hong Tae Park),신현식(Hyun Sik Shin),김천석(Chun Suk Kim),신윤호(Yun Ho Shin) 한국전자통신학회 2006 한국전자통신학회 논문지 Vol.1 No.1

현재 국내.외 기간 통신망은 급격히 증가하는 고속 대용량 트래픽을 효율적으로 멀리 전송하기 위해 광증폭기를 이용한 파장분할다중화방식 (DWDM:Dense Wavelength Division Multiplexing) 광전송 시스템 통신망을 구축하고 있다. DWDM광전송 시스템에서 고속, 대용량 및 장거리 전송을 하기 위해서는 기존 3R 광 중계기시스템에서 크게 중요시 않았던 광 fiber의 비선형(non-linearity) 전송제약 요소를 고려하여 통신망을 설계하여야 한다. 광통신망에서 장거리 전송 시 신호펄스 파형의 왜곡을 최소화하기 위해 영분산(zero-dispersion)을 구현하여야 하지만, 영분산으로 인하여 파이버의 비선형 현상이 나타나 신호 스펙트럼 왜곡 현상이 발생하는 문제가 있다. 즉 영 분산과 파이버의 비선형 사이에 서로 상충관계를 해결하여야 고속 대용량 트랙픽을 장거리 전송할 수 있다. 본 논문에서는 DWDM 해저 광 통신망에서 고속 대용량 트래픽을 장거리 전송하기 위한 기술을 알아보고, 영분산과 파이버의 비선형 사이에 상충문제를 해결 위한 분산관리 기법을 소개하고, 실제한국-홍콩간 해저 광통신 구간에서 분산 맵 (dispersion map)을 설계 구현하였다. Currently, Most of the Backhual and Submarine s networks are being installed using DWDM and EDFA to deal with dramatically increasing internet traffic. In a conventional type optical system, the so-called 3R repeater, fiber non- linearity was not significant factor but it is one of the most important consideration when designing new DWDM network based on the EDFAs. To minimize the signal pulse distortion in long-haul optical network, Zero-dispersion fiber is indispensable but causes the fiber non-linearity. Therefore this conflicting problems should be managed to transmit a high-speed capacity traffic. In this paper, key technologies in DWDM submarine optic network were found out for a high capacity traffic and introduced the dispersion management way for solving the conflicting problems between Zero-dispersion and non-linearity. Lastly designed a dispersion map in section between Korea and Hong-kong.

L.A. Olympic 男子 Hand ball 競技에 關한 考察

洪盛杓,柳在忠 忠南大學校體育科學硏究所 1984 體育科學硏究誌 Vol.2 No.1

The purpose of this study is provide fundamental information selection of handball player and training program for improvement of korean male handball players' athletic performance in Seoul Asian Game and Seoul Olympic Game which will be held in 1986 and 1988. For this study, all male handball game in LA. Olympic Game which was held in U.S.A. during 1984. 7.31-1984. 8.11 was surveyed.. Following conclusions were abtained : 1. To raise the National Handball Players average age over 3 years, business team have to be organized, and then the National Team have not to be composed only players of college. 2. Standing Height, and Body Weight of players would have to be increased over 190 ㎝ in height, 90kg in weight, and 46% in body weight ratio. 3. To gain a good rank, the ratio of gained and losed point have to be closely 6:4. And the game contents which was made of 60 % of attack, 20% of fast break, and 20% of penalty throw is desirable. 4. Defence tactics which can reduce the ratio of losed point by attack and offence tactics by fast break have to be developed. 5. Positive and Active play for Ten minutes after beginning is very need because of the remarkable difference of ratio of gained and losed point after beginning first or second half.

한국 성인을 대상으로 한 전산화 Standard Progressive Matrices의 표준화 예비연구

홍경수,이민수,오병훈,하규섭,유한익,이창욱,연병길,김성윤,신민섭,김재진,권준수 大韓神經精神醫學會 1999 신경정신의학 Vol.38 No.5

연구목적 : 전산화 Standard Progressive Matrices(SPM) 검사의 한국인 성인 표준자료를 확립함으로써, 간이로 지능을 평가하는 경우에도 보다 정확하게 지능지수를 추정하기 위해서 본 연구를 수행하였다. 방 법 : 18세 이상의 남녀 정상인 자원자 353명을 대상으로 전산화 SPM 검사를 시행하고, 백분율 및 표준점수(T-점수)를 기준으로 하여 표준화 자료를 작성하였다. 전체 대상군을 성별, 연령별로 구분한 후 평균과·분포가 유사한 집단은 군을 합치는 방법을 사용하였다. 한국인 표준자료에 근거하여 추정한 SPM 지능지수와 외국인 표준자료에 근거하여 추정한 SPM 지능지수를 각각 KWAIS 지능지수와 비교함으로써 타당도를 검증하였다. 결 과 : 18∼30세, 31∼40세, 41∼50세, 51세 이상의 연령군으로 구분된 한국 정상 성인의 SPM 표준화 자료를 산출하였다. 본 연구 결과에 의한 표준화 자료를 적용하여 지능지수를 추정하는 것이 현재 사용하고 있는 외국인의 표준화 자료를 이용하는 것보다 KWAIS 지능지수에 더욱 근접한 결과를 보였다. 결 론 : 18세에서 50세까지의 한국인 남녀에게는 간이지능평가도구로서 전산화 SPM 검사의 한국인 표준화 자료를 유용하고 타당하게 적용할 수 있음을 확인하였다. Objectives : We conducted this study to provide standardized data of the computerized Standard Progressive Matrices(SPM) test in Korean adults. Methods : The computerized SPM test was administered to 353 healthy volunteers aged 18 years over. We provided the standardized data(percentile and standardized T-scores) for the groups with similar mean and distribution of SPM scores, which was originally divided by age and sex. The validity of the new standardized data was tested by comparing IQs estimated by SPM and K-WAIS. Results : The standardized SPM data were provided for four age groups : 18 to 30 years, 31 to 40 years, 41 to 50 years, 51 years and over. IQ estimated by this standardized data tends to be closer to IQ by K-WAIS than the IQ estimated by foreign normative data. Conclusion : The standardized data of the computerized SPM were proven to be a useful and valid tool for measuring IQ briefly, compared with the conventional way of measuring IQ.

Low doses of ionizing radiation suppress doxorubicin-induced senescence-like phenotypes by activation of ERK1/2 and suppression of p38 kinase in MCF7 human breast cancer cells

신재식,우상혁,이형찬,홍승우,유두현,홍석일,이왕재,이명석,진영우,안성관,진동훈,박인철 Sookmyung Women's University Research Institute of 2010 여성과 건강 Vol.6 No.1

이상 열이송로프의 열저항에 관한 실험적 연구

유재복,부준홍,유상신 한국항공대학교 1995 論文集 Vol.33 No.-

본 연구에서는 실험적 관찰을 통하여 2상 열이송루프의 성능을 평가하였다. 상변화를 수행하는 작동유채의 관점에서 실험장치는 열을 받아 작동유체가 증발하는 증발부, 열이송이 이루어지는 단열부, 그리고 대기중에 방열하는 응축부로 구성된다. 2상 열이송루프는 증발부와 응축부의 거리를 멀리할 수 있는특징을 가지고 있는데 본 실험적 연구에서는 증발부와 응축부 사이의 거리를 1.2m로 하였다. 2상 열이송루프의 성능을 평가하기 위하여 시스템의 열저항을 증발부 온도와 대기 온도의 차를 증발부에 가해준 열부하로 나누어준 값을 정의하였다. 시스템의 열저항은 열부하의 증가에 따가 급격히 감소하는 경향을 나타내며, 열부하가 적을때는 작동유체량의 증가에 따라 열저항이 증가하지만 열부하가 크게 증가하면 열저항은 작동유체량의 영향을 거의 받지 않는다. In the present study, characteristics of a two-thermal transport loop are evaluated by the experimental investigation. Expermental setup is primarily composed of three parts: an evaporator where a working fluid is evaporated by heating or heat absorption, a thermal transport section that connects the evaporator and the condenser and a condenser which works as a thermal dissipator. One of advantages of the two-phase thermal transport loop is that the evaporator and condenser can be located separately far away. The distance between the evaporator and the condenser is about 1.2m in the present study. In order to evaluate the performance of the two-phase thermal transport loop the system thermal resistance is defined as the quotient of temperature difference between the evaporator and the ambient temperatures by the heat supplied to the evaporator. The system thermal resistance decreases rapidly as the heat load increases. The system thermal resistance increasesas the quantity of working fluid increases for the low range of the heat load, but the thermal resistance is slightly dependent upon the quantity of working fluid as the heat load increases.

한체대생의 여가실태와 향후지도방안

유병열,허재홍 한국체육대학교 학생생활연구소 2000 學生生活硏究 Vol.- No.6

최근 5년간 급성 A형 간염으로 입원한 환자들에 대한 입원 내용 분석

장재영,유병욱,조용진,오정은,홍성호,조주연 순천향대학교 의학연구소 2009 Journal of Soonchunhyang Medical Science Vol.15 No.1

Abstract Background : Due to improvements in Korea's sanitary conditions, antibody rates to the hepatitis A virus is decreasing rapidly and admission due to the disease is increasing, Patients who were admitted for hepatitis A during the last 5 years were selected and yearly differences in admission, clinical picture, medical fees, and differences according to age and gender were analyzed. Methods : Patients who were admitted to the Seoul Soonchunhyang University Hospital during the 5 year period between May of 2003 and April of 2008 and tested positive for IgM anti-HAV were selected and their medical records retrospectively analyzed. Results : 156 subjects [91 male (58%), 65 female (42%) were selected. The average age was 29.2 years (range; 21.4-37), average admission period 12.6 days (range; 12.5-1 7.7) days, and average medical fees 2,295,151 (range; 932,097-3,658,205) KRW(Korean Won), Yearly incidence rates were as follows : 10 for May, 2003 to April, 2004, 14 for May, 2004 to April, 2005, 23 for May, 2005 to April, 2006, 69 for May, 2006 to April, 2007, and 41 for May, 2007 to April, 2008, The maximum value median of AST, ALT, and bilirubin during admission was 989 IU/L, 1999 IU/L, and 5.6 mg/dL each, Each factors were all positively correlated with the patient's age. Conclusions : Recent decrease in antibody positivity of the hepatitis A virus and subsequent surge of acute hepatitis A is a cause of rising socioeconomic costs. A large scale epidemiologic research on whether HAV vaccination should be made mandatory and health insurance applied seems to be needed. Key words : Hepatitis A, Age, Medical fees, Vaccination

Low doses of ionizing radiation suppress doxorubicin-induced senescence-like phenotypes by activation of ERK1/2 and suppression of p38 kinase in MCF7 human breast cancer cells

신재식,우상혁,이형찬,홍승우,유두현,홍석일,이왕재,이명석,진영우,안성관,진동훈,박인철 Sookmyung Women's University Research Institute of 2010 여성과 건강 Vol.6 No.1

고에너지 전자빔 투사를 이용한 표면합금화 재료의 미세조직 연구

유정훈,신기삼,윤재홍,이찬규,허성강,오준철,이성학,어광준 국립7개대학공동논문집간행위원회 2002 공업기술연구 Vol.2 No.-

For determination of the mechanism of microstructural modification by surface alloying technique using high energy electron beam (HEEB), surface alloys of carbon steel with TiC, TiB_2 and VC were fabricated and their microstructures were analyzed using optical microscope, XRD (X-ray diffractometer), and SEM (scanning electron microscope). The surface regions of TiC and VC surface alloy consists of 1) melted, 2) interface, and 3) heat affected regions. In the TiC surface alloy precipitates of large primary and fine eutectic TiC were observed. In TiB_2 surface alloy, neither fine precipitates were present nor the TiB_2 shape was changed from the original particles, which was attributed to the high melting temperature of TiB_2. Among the three surface alloys studied, the melted region hardness of VC surface alloy was the highest.

장치의 열제어를 위한 소형 2상 열이송루프 성능에 관한 실험적 연구

유재복,부준홍 한국항공대학교 1994 論文集 Vol.32 No.-

2상 열이송 루프는 액체-증기간 상변화를 이용하여 매우 높은 열이송 성능을 낼 수 있는 장치이다. 일반적인 응용은 우주비행체와 전자장비의 열제어이다. 본 논문에서는 한국항공대학교에서 제작된 2상 열이송루프의 기초적인 설계방법, 실험결과, 성능해석을 제시하려고 한다. 실험장치는 크게 집열부, 열이송부, 그리고 방열부의 세 부분으로 구성된다. 상변화를 수행하는 작동유체의 관점에서 이들은 각각 증발부, 단열부, 그리고 응축부가 된다. 증발부와 응축부 사이의 거리는 약 1.2m이다. 실험장치를 제작한 후에 일련의 실험은 500Watts의 열부하를 이송하는 전체 시스템 및 각 부의 성능을 해석하기 위하여 이루어졌다. 증발부에서의 작동유체와 대기와의 온도차, 시스템의 작동온도, 루프의 열저항이 열부하의 여러가지 값과 액체 주입의 양에 따라 조사되었다. Two-phase thermal transport loop is a high-performance heat transfer equipment that utilizes phase change between liquid and vapor. Typical application includes thermal control of space vehicles and electronic equipments. This paper deals with a basic design methodology and presents experimental results and performance analysis of a two-phase thermal transport loop that was built at Hankuk Aviation University. Expermental setup is primarily composed of three parts: thermal collector, thermal transport section, and thermal dissipator. These are called as evaporator, adiabatic section, and condenser from the viewpoint of working fluid performing phase change. The distance between the evaporator and the condenser is about 1.2m. After construction of the experimental setup, a series of experiments were conducted to analyze the performance of each component as well as that of the entire system carrying a thermal load of 500 Watts. The temperature difference between the working fluid in the evaporator and the ambient air, the operating temperature of the system, and the thermal resistance of the loop were investigated with various values of heat load and amount of liquid charges.