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Analysis of Burnable Poison Effect on Power Distribution using Power Sensitivity Coefficient Concept
Yi, Yu-Han,Oh, Soo-Youl,Seong, Seung-Hwan,Lee, Un-Chul Korean Nuclear Society 1988 Nuclear Engineering and Technology Vol.20 No.1
The low leakage leading pattern has features as the placement of some fresh fuel assemblies in the core interior to reduce the neutron fluence on the pressure vessel and to enhance the neutron economics. But as fresh fuel assemblies are loaded in the core interior, the local power tends to exceed safety limit due to the high reactivity of the fresh assemblies. Therefore, a large number of burnable poisons must be utilized in a low leakage scheme to suppress the high assembly power as well as the excess reactivity. In this study the effects of burnable poisons are treated as a perturbation on the power distribution, and the 'Power Sensitivity Coefficient' concept is adopted. An application study is performed for cycle 1 of the Korea Nuclear Unit-7 (KNU-7) to justify the usefulness of the reverse depletion method coupled with the above concept. To obtain the optimal burnable poision distribution at the given burnup step, the linear programming technique is adopted. The result shows maximum 4.5% error in the amount of burnable poisons between the calculated and the reference values. It is concluded that the design methodology which consists of the reverse depletion, the power sensitivity coefficient concept, and the linear programming technique can be used to find the optimal turnable poison distribution.
Jung, Byung-Ryul,Yi, Yu-Han,Lee, Un-Chul,Park, Chan-Oh Korean Nuclear Society 1991 Nuclear Engineering and Technology Vol.23 No.3
가압 경수로의 노심 설계에 있어서 제한된 우라늄 자원의 효율적인 이용을 위한 다양한 방안으로 장주기 운전, 고연소도 및 저누출 장전 모형 통을 강구하고 있는 추세이다. 이러한 노심들은 원자로 운전 주기 전반에 걸친 공간적 출력 분포 제어와 잉여 반응도 제어를 위해 가연성 독물질을 사용하고 있다. 이와 관련하여 가연성 독물질 관리의 최적화 연구가 다각도로 진행되고 있다. 본 연구에서는 1990년도부터 국내 가압 경수로에 국산 핵연료가 장전되기 시작하면서 가도리니아 독봉을 사용하고 있으며 장차 주된 가연성 독물질로 쓰일 예정이므로 이에 대해서 분석을 수행하였다. 분석 결과 가도리니아 독봉은 열중성자 흡수 단면적이 매우 큰데서 기인한 특이한 연소 특성을 보이고 있다. 특히 집합체 내에서의 가도리니아 독봉의 위치에 따라 매우 다양한 출력 분포를 보이고 있다. 이러한 다양한 출력 분포 중에서 노심의 반경 방향 첨두 출력을 가능한 낮게하는 집합체 내에서의 가도리니아봉 위치 최적 선정을 위한 방법론을 제시하였다.
MEMS 공정을 위한 여러 종류의 산화막의 잔류응력 제거 공정
이상우(Sang Woo Yi),김성운(Sung Un Kim),이상운(Sang Woo Lee),김종팔(Jong Pal Kim),박상준(Sang Jun Park),이상철(Sang Chul Lee),조동일(Dong Il cho) 한국센서학회 1999 센서학회지 Vol.8 No.3
Various oxide films are commonly used as a sacrificial layer or etch mask in the fabrication of microelectromechanical systems (MEMS). Large residual strain of these oxide films causes the wafer to bow, which can have detrimental effects on photolithography and other ensuing processes. This paper investigates the residual strain of tetraethoxysilane (TEOS), low temperature oxide (LTO), 7 wt% and 10 wt% phosphosilicate glass (PSG). Euler beams and a bent-beam strain sensor are used to measure the residual strain. A polysilicon layer is used as the sacrificial layer, which is selectively etched away by XeF₂. First, the residual strain of as-deposited films is measured, which is quite large. The residual strain of the films is also measured after annealing them not only at 500 ℃, 600 ℃, 700 ℃ and 800 ℃ in N₂ environment for 1 hour but also at the conditions for depositing a 2 ㎛ thick polysilicon at 585 ℃ and 625 ℃. Our results show that the 7 wt% PSG is best suited as the sacrificial layer for 2 ㎛ thick polysilicon processes.
Kwon, Tae-Jun,Cho, Hyun-Ju,Kim, Un-Kyung,Lee, Eujin,Oh, Se-Kyung,Bok, Jinwoong,Bae, Yong Chul,Yi, Jun-Koo,Lee, Jang Woo,Ryoo, Zae-Young,Lee, Sang Heun,Lee, Kyu-Yup,Kim, Hwa-Young IRL Press 2014 Human molecular genetics Vol.23 No.6
<P>Methionine sulfoxide reductase B3 (MsrB3) is a protein repair enzyme that specifically reduces methionine-<I>R</I>-sulfoxide to methionine. A recent genetic study showed that the <I>MSRB3</I> gene is associated with autosomal recessive hearing loss in human deafness DFNB74. However, the precise role of MSRB3 in the auditory system and the pathogenesis of hearing loss have not yet been determined. This work is the first to generate <I>MsrB3</I> knockout mice to elucidate the possible pathological mechanisms of hearing loss observed in DFNB74 patients. We found that homozygous <I>MsrB3<SUP>−/−</SUP></I> mice were profoundly deaf and had largely unaffected vestibular function, whereas heterozygous <I>MsrB3<SUP>+/−</SUP></I> mice exhibited normal hearing similar to that of wild-type mice. The MsrB3 protein is expressed in the sensory epithelia of the cochlear and vestibular tissues, beginning at E15.5 and E13.5, respectively. Interestingly, MsrB3 is densely localized at the base of stereocilia on the apical surface of auditory hair cells. MsrB3 deficiency led to progressive degeneration of stereociliary bundles starting at P8, followed by a loss of hair cells, resulting in profound deafness in <I>MsrB3<SUP>−/−</SUP></I> mice. The hair cell loss appeared to be mediated by apoptotic cell death, which was measured using TUNEL and caspase 3 immunocytochemistry. Taken together, our data suggest that MsrB3 plays an essential role in maintaining the integrity of hair cells, possibly explaining the pathogenesis of DFNB74 deafness in humans caused by MSRB3 deficiency.</P>
A Medium Maturity, and High Quality Rice Variety, "Hwabongbyeo"
Byeong Geon Oh,Sang Jong Lim,Ki Hwan Yi,No Bong Park,Un Sang Yeo,Sae Jun Yang,Ho Yeong Kim,Heung Gu Hwang,Do Yeon Kwak,Jong Rae Kang,Jeom Sik Lee,Soon Chul Kim,Moo Sang Lim 한국육종학회 2003 한국육종학회지 Vol.35 No.1
This japonica cultivar was developed from a cross between two F1 hybrids of YR13168 (Milyang 95/Iri390) and YR13198 (Milyang101/Iri390) using anther culture. It has about 104 days of growing duration from seeding to heading and relatively short
최상진,권학철,이재훈,이원빈,최상운,이강노,Choi, Sang-Zin,Kwon, Hak-Chul,Yi, Jae-Hun,Lee, Won-Bin,Choi, Sang-Un,Lee, Kang-Ro 한국생약학회 2001 생약학회지 Vol.32 No.1
Three alkaloids, (-)-stylopine (I), (+)-chelidonine (II), oxysanguinarine (III) and two triterpenoids, $6{\alpha}-hydroxy-A-neo-germacer-22(29)-en-30-oic\;acid$ (IV) and hop-22(29)-en-30-oic acid (V), were isolated from the methanol extract of of Chelidonium majus var. asiaticum, and their cytotoxicity were tested against five cultured human tumor cell lines.