^161, ^163Dy의 0.003eV~50keV의 중성자 포획 단면적 측정

민영기,윤정란,노태익,김귀년,이삼열 東亞大學校附設基礎科學硏究所 2002 基礎科學硏究論文集 Vol.19 No.1

교토대학 원자로 연구소의 46MeV 전자선형가속기를 사용하여 중성자 TOF 방법으로, 에너지 영역 0.003eV∼50keV의 ^161, 163Dy sample의 중성자 포획 단면적을 측정하였다. 본 실험에서 사용된 Bi_4Ge_3O_12(BGO) 섬광 검출기는 sample의 핵반응에서 나오는 즉발 포획 감마선 측정에 사용하였다. 이 검출기는 중성자 선원으로부터 거리 12.7±0.02m 위치에 12개의 블록으로 되어 있으며, sample에 포획되는 중성자 flux의 절대치를 구하기 위해 Sm(n, γ) 및 ^10B(n, αγ) 반응을 이용하였다. ^161, 163Dy에 대한 포획 단면적 측정결과는 ENDF/B-VI 결과와 비교하였다. The neutron capture cross sections of ^161, 162Dy has been measured in the energy region from 0.003eV 50keV by using the neutron time-of-flight(TOF) promptγmethod with a 46MeV electron linear accelerator at the Research Reactor Institute, Kyoto University. An assemble of twelve pieces of BGO scintillation detectors, which was placed at a distance of 12.7±0.02mm from the neutron source, was employed as a total energy absorption detector for the prompt capture gamma-ray measurement, to obtain the absolute capture cross section value. The sample of ^161, 163Dy is a form of metallic plate. An enriched boron sample was employed to monitor the neutron flux/spectrum of the TOF beam using the standard reference cross section of the ^10B(n, αγ) reaction. Previous measurements and evaluated data in ENDF/B-VI was compared with the present results.

장기간 수영운동에 참가한 중년여성의 신체구성과 건강체력 특성에 대한 연구

전종귀,성민철,이창규,현광석,조병준 충남대학교 체육과학연구소 2000 體育科學硏究誌 Vol.18 No.1

The purpose of this study was to identify the effects of swimming exercise career on the middle-aged women. The number of sujects were 44 postmenopausal women(45-60 age group). The number of exercise group were 27(3 years average career) and that of control group were 17, Percent body fat physical development score, back strength, grip strength, trunk flexion, endurance were measured. The results were as followings; 1. The percent body fat, physical development score, back strength, grip strength, endurance of swimming exercise group was higher than that of control group. The difference showed the statistical significance. The trunk flexion and grip strength of swimming exercise group were lower than that of control group. The difference didn't showed the statistical significance. 2. The back strength, muscle endurance, endurance of swimming exercise 7 years average career group was higher than that of 3 years average career group. The difference showed the statistical significance. As the above, the regular participation of swimming exercise help the middle-aged women to promote their health-related fitness. Also the exercise prevent obesity, back pain.

단위 연료전지 내 가스채널에서의 Phoenics를 이용한 수치모사 연구

劉旼炡,鄭貴榮 弘益大學校 科學技術硏究所 2005 科學技術硏究論文集 Vol.16 No.-

The mathematical modeling of MCFC was carried out to observe the effects of the water-gas shift reaction. Using the commercial CFD program Phoenics, studies on the butterfly-type fuel cell was carried out. Calculated results were compared with those of the general type fuel cell. In previous studies, it was assumed that properties of gases along the direction of gas channel height were constant. The consumption and the generation rates of CO_(2) could be decided as the rates which gave 0.4 of the hydrogen utilization in the anode gas channel. The y-directional average values were similar to the values near the separator surface and they positioned near the electrode surface. Therefore it was shown that it is safe to assume that the gas concentration along the direction of gas channel height is constant. Effects of the size of channel height on the x-directional distribution of X_(a)co_(2) appeared greater at a constant linear velocity rather than at a constant volumetric flow rate. As expected, the x-directional distributions of Xco_(2) in the butterfly type gas channels became more uniform.

용융탄산염 연료전지의 CFD를 이용한 수치모사

劉旼炡,鄭貴榮 弘益大學校 科學技術硏究所 2004 科學技術硏究論文集 Vol.15 No.-

The gas channels of the molten carbonate fuel cell (MCFC) have been studied numerically. Distributions of pressure and gas compositions in the anode and the cathode gas channels were observed. The rate constant of the electrochemical reaction was deduced with the value of hydrogen usage. Calculations were made at the different values of the reaction rate constant and also at different sizes of gas channels. The commercial fluid dynamics program, Phoenics, was used. When the volumetric velocity is constant and the height of gas channel is changed, the changes of the CO2 concentration are big when the height of gas channel is thick. When the volumetric velocity is constant and the rates of generation and consumption are multiplied by 0.5, 1 and 2, the changes of the CO2 concentration are big when the rate of generation and consumption is big. On the other hand, when the linear velocity is constant, the changes of the CO2 concentration are big when the height of gas channel is thin.

위암 환자에서 절제된 림프절 수의 차이와 관련이 있는 인자

정귀애,박정희,변익건,김경종,장정환,김권천,민영돈 朝鮮大學校 附設 醫學硏究所 2004 The Medical Journal of Chosun University Vol.29 No.1

Purpose: By the definition of UICC TNM classification (fifth edition), the nodal stage of gastric cancer is based on the number of metastatic lymph nodes, which is influenced by the number of resected lymph nodes. And individual differences in the number of resected lymph nodes had been observed in patients with gastric cancer. The aim of this study is to verify the factors which are associated with the difference in the number of resected lymph nodes in patients with gastric cancer. Methods: We reviewed 613 patients with gastric cancer who underwent curative resection and D2 lymph node dissection with 15 or more resected lymph nodes. The number of resected lymph nodes was analyzed according to the characteristics of patients, the types of operation and prognostic factors of gastric cancer. Results: The mean number of resected lymph nodes per patient was 33.0 (median: 31.0, range: 15-88). The number of resected lymph nodes was significantly associated with the types of operation, the location and size of tumor, macroscopic types, depth of tumor invasion and the number of metastatic lymph nodes. Patient's age, gender and the histopathological finding's had no relationship with the number of resected lymph nodes. Conclusions: The number of resected lymph nodes from gastric cancer was different in each patient despite of same D2 lymph node dissection and it was associated with several prognostic factors of gastric cancer.

Characterization of carbohydrate combining sites of Bryohealin, an algal lectin from Bryopsis plumosa

Jung, Min Gui,Lee, Key Pyoung,Choi, Han-Gu,Kang, Sung-Ho,Klochkova, Tatyana A.,Han, Jong Won,Kim, Gwang Hoon Springer-Verlag 2010 Journal of applied phycology Vol.22 No.6

CVI 를 이용한 이염화이메틸규소로부터의 탄화규소 증착에 의한 화이버강화 세라믹 복합재료 제조의 연구

김정우,조민수,정귀영,주재백,유재훈 한국화학공학회 1996 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.34 No.4

이염화이메틸규소와 수소로부터 화학증기침투(CVI)에 의해 옷감형 탄소 화이버프리폼에 탄화규소를 증착시켜 탄소/탄화규소 복합재료가 제조되었다. 이염화이메틸규소는 950℃이상의 온도에서는 거의 전부 열분해되었다. 증착속도는 압력 즉 이염화이메틸규소의 농도가 증가할수록 증가하였다. 또한 증착온도가 올라갈수록 증가하다가 1000℃ 이상의 고온에서는 부반응에 의해 감소하였다. 탄화규소는 샘플 내부 화이버 주위에 고르게 증착되었으며 β-형임이 확인되었다. 이염화이메틸규소의 1차 증착 반응속도상수는 950℃에서 30㎝/min이었고, 이레니우스 상수와 활성화에너지는 각각 1.58×10^(12)㎝/min와 60㎉/㏖이었다. C/SiC composite materials were prepared by depositing silicon carbide from dichlorodimethylsilane(DDS) and hydrogen in the woven fabrics of carbon fibers through chemical vapor infiltration(CVI). Most of DDS decomposed thermally at the temperature above 950℃. The deposition rate increased with the pressure, i.e., the concentration af dichlorodimethylsilane. It also increased wit4 the deposition temperature, however, it decreased after the temperature reached 1000℃ due to side reactions. Silicon carbide deposited uniformly around fibers in the sample and was confirmed as β-type. The first-order deposition rate constant at 950℃ was 30㎝/min and the Arrhenius constant and the activation energy were 1.58×10^(12) ㎝/min and 60 ㎉/㏖, respectively.

고성능 슈퍼스칼라 프로세서를 위한 분기예측기의 설계 및 구현

서정민(Jung-Min Seo),김귀우(Gui-Woo Kim),이상정(Sang-Jung Lee) 한국정보과학회 2001 한국정보과학회 학술발표논문집 Vol.28 No.1A

슈퍼스칼라 프로세서에서는 분기 명령의 결과 지연으로 명령의 공급이 중단되는 것을 방지하고 지속적인 파이프라인 처리를 위해서 분기의 결과를 미리 예측하여 명령을 페치하고 있다. 본 논문에서는 심플스칼라 툴 셋을 사용하여 슈퍼스칼라 프로세서에서 사용되는 대표적인 동적 분기예측 방법 시뮬레이션 환경을 구축한다. 동적 분기예측 방법으로 분기 타겟 버퍼(Branch Target Buffer, BTB) 상에서 분기명령의 자기 히스토리에 근거한 BTB 방식과 이전 분기명령의 히스토리와의 상관관계를 고려한 Gshare 분기예측기를 적용 구현한다. 심플스칼라 시뮬레이터에 SPEC95 벤치마크 프로그램을 실행시켜 디자인 파라미터 변화에 따른 분기 예측기의 예측정확도를 실험한다. 또한 BTB와 Gshare 분기 예측기를 VHDL로 구현하고 Synopsys 툴을 이용하여 시뮬레이션 및 합성 과정을 거쳐 게이트 크기와 파워 소모량을 측정한다.

LabVIEW를 이용한 자동차 범퍼 불량검출 시스템 설계

정민포(Min-Po Jung),안귀임(Gui-Im Ahn),박영식(Young-Sik Park),장시웅(Si-Woong Jang),정덕길(Deok-Gil Jung) 한국정보기술학회 2008 Proceedings of KIIT Conference Vol.2008 No.-

LabVIEW를 이용한 밴드 모양 불량 검출 시스템 설계

정민포(Min-Po Jung),안귀임(Gui-Im Ahn),박영식(Young-Sik Park),장시웅(Si-Woong Jang),정덕길(Deok-Gil Jung),옥철영(Chul-Young Ok) 한국정보기술학회 2009 Proceedings of KIIT Conference Vol.2009 No.-

국내의 밴드 생산 업체에서는 생산에서부터 완제품까지 자동화된 생산 라인을 통해 밴드를 생산한다. 자동화된 생산 라인으로부터 생산된 밴드는 작업자의 눈으로 제품의 이상 유무에 대한 전수 작업 검증을 통해 밴드 생산 공정이 완료된다. 이러한 작업 공정은 작업자가 수작업으로 밴드의 완성여부를 체크함으로서 제품에 대한 잘못된 검증으로 인해 불량을 유발시키는 요인이 된다. 본 논문에서는 LabVIEW 및 Vision Builder AI의 기능 소개와 LabVIEW와 Vision Builder AI를 사용하여 검수자의 불량에 대한 전수 작업을 현재 공정상의 작업라인에는 영향을 미치지 않고 적용할 수 있는 방안을 살펴본다.