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밀도검층 이격보정 실용화를 위한 Spine and Ribs 기법 연구
한만호(Manho Han),김영화(Yeonghwa Kim),이명종(Myeong-Jong Yi),김종만(Jongman Kim) 대한자원환경지질학회 2018 자원환경지질 Vol.51 No.1
밀도가 다른 4개의 실험공에서 2007년부터 2011년까지 수행한 이격보정 실험 자료를 이용하여 가장 효과적인 보정 차트를 알기 위해 연구를 수행하였다. 먼저 선원의 불규칙적인 붕괴특성을 파악하고 비이상적인 감마반응을 잘라 내는 방법으로 이격보정 자료의 효과를 높였다. 수정된 이격보정 자료로부터 검출기 조합별, 시추공 밀도별, 이격보정 기법별 효과를 분석하였다. 그 결과 통상적으로 사용해 온 LSD-SSD 조합보다 LSD-MSD 조합이 이격보정에 더 적합하며, 지하수위면 하부에 위치한 토양층이나 풍화대의 이격보정에서는 큰 오차를 피하면서 이격보정이 가능한 것으로 나타났다. 일반 이격보정에 비해 밀도형 이격보정에서 오차의 규모가 전반적으로 높게 나타났으나 지하수면 하부에 있는 풍화대나 토양층을 대상으로 하는 이격보정에서는 충분히 밀도형 이격보정이 효과적인 것으로 나타났다. We carried out the standoff compensation data from 2007 to 2011 into four different density borehole models to find out the most effectiveness of standoff compensation charts. First, we investigated the irregular collapse characteristics of gamma ray and cut the non-ideal gamma response to improve the effectiveness of the standoff compensation error data. Effectiveness of detector combinations, density of borehole, and spine and ribs techniques from the modified standoff compensation data was analyzed. As the result of comparison, LSD-MSD combination has been suitable for standoff compensation more than LSD-SSD combination and it is possible to do standoff compensation for soil or weathered zone under groundwater level without fatal errors. Even though error scales of density transformed spine and ribs techniques were generally large compared to the conventional standoff compensation, standoff compensation for soil and weathered zone under groundwater level were sufficiently effective.
Hyungju Yun,Manho Han,Seo-Yeon Cho,Jihye Seo,Hyeonwoo Oh 한국방사성폐기물학회 2022 한국방사성폐기물학회 학술논문요약집 Vol.20 No.1
The criticality analyses considering burnup credit were performed for a spent nuclear fuel (SNF) disposal cell consisting of bentonite buffer and two different types of PWR SNF disposal canister: the KBS-3 type canister and the small standardized transportation, aging and disposal (STAD) canister. The criticality analyses were carried out for four cases as follows: (1) the calculation of isotopic compositions within a SNF using a depletion assessment code and (2) the calculation of the effective multiplication factor (keff) value using a criticality assessment code. Firstly, the KBS-3 type canister containing four SNFs of the initial enrichment of 4.0wt% 235U and discharge burnup of 45,000 MWD/MTU was modelled. The keff values for the cooling times of 40, 50, and 60 years of SNFs were calculated to be 0.74407, 0.74102, and 0.73783, respectively. Secondly, the STAD canister was modelled. The SNFs contained in the STAD canister were assumed to be the enrichment of 4.0wt% and the burnup of 45,000 MWD/MTU. The keff values for the cooling times of 40, 50, and 60 years were estimated to be 0.71448, 0.70982, and 0.70743, respectively. Thirdly, the KBS-3 canister with four SNFs of which the enrichment was 4.5wt% and the burnup was 55,000 MWD/MTU was modelled. The keff values for the cooling times of 40, 50, and 60 years were 0.73366, 0.72880, and 0.72634, respectively. Finally, the calculations were carried out for the STAD canister containing four SNFs of the enrichment of 4.5wt% and the burnup of 55,000 MWD/MTU. The keff values for the cooling times of 40, 50, and 60 years were 0.70323, 0.69946, and 0.69719, respectively. Therefore, all of four cases met the performance target with respect to the keff values, 0.95. The STAD canister showed lower keff values than the KBS-3 canister. This appears to be the neutron absorber plate installed in the STAD canister although the distance among the four SNFs in the STAD canister was shorter than the KBS-3 canister.
Rami Lee,Han Sang Lee,Won-Woo Kim,Manho Kim,Seung-Yeol Nah 고려인삼학회 2023 Journal of Ginseng Research Vol.47 No.6
Background: Gintonin is a new material of ginseng that acts through the ginseng-derived lysophosphatidicacid (LPA) receptor ligand. The gintonin-enriched fraction (GEF) inhibits amyloid plaque accumulationin the cortex and hippocampus, improves cognitive dysfunction by increasing acetylcholinelevels, and promoted hippocampal neurogenesis in an animal model of Alzheimer's disease. We evaluatedthe effect of the GEF on the cognitive performance of subjects with subjective memory impairment(SMI). Methods: In this eight-week, randomized, assessor- and participant-blinded, placebo-controlled study,participants with SMI were assigned to three groups receiving placebo, GEF 300 mg/day or GEF 600 mg/day. The Korean versions of the Alzheimer's Disease Assessment Scale (K-ADAS), Mini-Mental StateExamination (K-MMSE), and Stroop color-word test (K-SCWT) were also evaluated along with the safetyprofiles. Results: One hundred thirty-six participants completed the study. After eight weeks, we analyzedintergroup differences in primary or secondary outcome score changes. When we compared the GEFgroup with the placebo group, we observed significant improvements in the K-ADAS and K-SCWT scores. The GEF group did not show a significant improvement in K-MMSE and BDI scores compared to theplacebo group. No adverse events were observed in the gintonin and placebo groups for eight weeks. Conclusion: The GEF is safe and effective in improving subjective cognitive impairment related to boththe K-ADAS and K-SCWT in this study. However, further large-scale and randomized controlled studiesare warranted to secure other cognitive function tests besides the K-ADAS and K-SCWT, and to confirmthe findings of the current study.
수소화 붕소 나트륨 (NaBH<sub>4</sub>) 과 이산화탄소의 환원을 이용한 바나듐 레독스 흐름전지용 탄소 촉매 개발
한만호,김한성,Han, Manho,Kim, Hansung 한국전기화학회 2018 한국전기화학회지 Vol.21 No.1
In this study, boron - doped carbon was prepared by reducing carbon dioxide ($CO_2$) at high temperature by using sodium borohydride ($NaBH_4$). The boron - doped carbon was coated on carbon felt and applied as an electrode for a vanadium redox battery cell. As a result of electrochemical performance evaluation, reversibility of carbon felt coated with boron doped carbon compared to pure carbon felt was improved by about 20% and charge transfer resistance was reduced by 60%. In the charge / discharge results, energy density and energy efficiency were improved by 21% and 12.4%, respectively. These results show that carbon produced by reduction of $CO_2$ can be used as electrode material for redox flow battery. 본 연구에서는 수소화 붕소 나트륨 ($NaBH_4$)를 이용하여 고온에서 이산화탄소 ($CO_2$)를 환원시켜 붕소가 도핑된 카본을 제조하였고, 이를 카본 펠트에 코팅하여 바나듐 레독스 흐름전지용 전극으로 적용하였다. 전기화학적 성능 평가 결과, 순수 카본펠트 대비 붕소 도핑된 카본으로 코팅된 카본펠트의 가역성이 약 20% 향상되었고 전하 전달 저항이 60% 감소하였다. 충/방전 결과에서는, 에너지 밀도와 에너지 효율이 각각 21%와 12.4% 향상되었다. 이러한 결과는 $CO_2$를 환원시켜 제조한 탄소가 레독스 흐름전지용 전극소재로 사용될 수 있는 가능성을 보여준다.
국방분야 인공지능 영상감시체계의 시험평가 발전방안 연구
조규표(Qupyo Cho),한만호(Manho Han),류홍렬(Hongryul Ryu),이종관(Jongkwan Lee),김승민(Seungmin Kim) 한국신뢰성학회 2023 신뢰성응용연구 Vol.23 No.1
Purpose: This study proposes a method of data set collection and utilization in conjunction with the pathway of test and evaluation (T&E) methods for the military use of AI-based image surveillance systems, which is a crucial application of AI technology. Methods: The inadequacy of current T&E methods used in AI-based image surveillance system in the military was revealed by indicating the incompatibility of current acquisition process and identifying characteristics of the AI-based image surveillance systems for military purposes. Results: A data set collection method as well as alternative T&E methods and an acquisition procedure for the military use of the AI-based image surveillance system are proposed. Conclusion: It is expected that the consensus can be reached for the importance of the development of the T&E methods along with the improvement of the relevant policies and regulations. Moreover, it would serve as a guideline for setting up the procedure of the T&E methods for the AI-based image surveillance system in defense.