[Free Paper] Effect of Berberine on p53 Expression by TPA in Breast Cancer Cells

Jeonghun Han,Sangmin Kim,Nam-Young Kim,Se Kyung Lee,Min-Young Choi,Jeonghui Lee,Jiyoung Kim,Seungpil Jung,Jee Soo Kim,Jung-Han Kim,Jun-Ho Choe,Jeong Eon Lee,Seok Jin Nam 대한외과학회 2011 대한외과학회 학술대회 초록집 Vol.2011 No.11

Seismic Analysis of Concrete Pad in the Dry Storage Facilities According to Soil Properties

Seungpil Kim,Sang Soon Cho 한국방사성폐기물학회 2022 한국방사성폐기물학회 학술논문요약집 Vol.20 No.2

Some Spent Fuel Pools (SFPs) will be full of Spent Nuclear Fuels (SNFs) within several years. Because of this reason, building interim storage facilities or permanent disposal facilities should be considered. These storage facilities are divided into wet storage facilities and dry storage facilities. Wet storage facility is a method of storing SNF in SFP to cool decay heat and shielding radiation, and dry storage facility is a method of storing SNF in a cask and placing on the ground or storage building. However, wet storage facilities have disadvantages in that operating costs are higher than that of dry storage facilities, and additional capacity expansion is difficult. Dry storage facilities have relatively low operating costs and are relatively easy to increase capacity when additional SNFs need to be stored. For this reason, since the 1990s, the number of cases of applying dry storage facilities has been increasing even abroad. Dry storage facilities are divided into indoor storage facilities and outdoor storage facilities, and outdoor storage facilities are mostly used to take advantage of dry storage facilities. In the case of outdoor storage facilities, the cask in which SNFs are stored is placed on a designed concrete pad. During this storage, the boring heat generated by SNFs cools into natural convection and the cask shields the radiation that SNFs generates. However, if an accident such as an earthquake occurs and the cask overturns during storage, there may be a risk of radiation leakage. Such a tip-over accident may be caused by the cask slipping due to the vibration of an earthquake, or by not supporting the cask properly due to a problem in the concrete pad. Therefore, in the case of outdoor dry storage facilities, it is necessary to evaluate the seismic safety of concrete pads. In this paper, various soil conditions were applied in the seismic analysis. Soil conditions were classified according to the shear wave velocity, and the shear wave velocity was classified according to the ground classification criteria according to the general seismic design (KDS 17 10 00). The concrete pad was designed with a size that 8 casks can be arranged at regular intervals, and 11# reinforcing bars were used for the design of the internal reinforcement of the concrete pad according to literature research. The cask was designed as a rigid body to shorten the analysis time. The soil to which the elastic model was applied was designed under the concrete pad, and infinite elements were applied to the sides and bottom of the soil. The effect on the concrete pad and cask by applying a seismic wave conforming to RG 1.60 to the bottom of the soil was analyzed with a finite element model.

FE Analysis on Drop Accident for Ship Loading Process of SF Transport Cask

Seungpil Kim,Sang Soon Cho,Jae Hoon Lim 한국방사성폐기물학회 2022 한국방사성폐기물학회 학술논문요약집 Vol.20 No.1

Some Spent Fuel Pools (SFPs) will be full of Spent Nuclear Fuels (SNFs) within several years. Because of this reason, transporting the SNF from SFP to interim storage facilities or permanent disposal facilities should be considered. There are two ways to transport the SNF from a site to other site, one is the land transportation with truck or train, and the other is the maritime transportation with ship. The maritime transportation has some advantages compared with the land transportation. The maritime transportation method uses safer route which is far from populated area than land transportation method, and transport more weight than land transportation method. However, the cask should be loaded into the ship for the maritime transportation, and there is a possibility of a drop accident of the cask onto the ship. Therefore, it is necessary to evaluate the structural integrity of the cask and ship for the drop accident during the loading process. To evaluate the structural integrity of the cask and ship, it is necessary to determine the analysis conditions that caused the greatest damage in the drop accident. There may be various conditions such as the drop angle of the cask, the initial falling speed, the drop position onto the ship, the size of the ship, etc. This study set the drop angle of the cask and the drop position onto the ship as the simulation variables, which have high possibility to occur during cask drop. However, the others are excluded since they are controllable by worker. In this paper, various drop angle (0, 15, 30, 45, and 70 degree) of the cask were simulated to define the greatest damage condition. KORAD-21 cask model was used for Finite Element Analysis (FEA), and FEA was performed to simulate a horizontal drop (1 m drop). The strain-hardening material properties for the deck were used as HT36 steel. The Cowper-Symonds constitutive model for HT36 was used to consider the strain rate effect. A Tie-down structure for supporting the cask was modeled with the cask model which contained inner structures like canister, basket, etc. Structural integrity of the cask and tie-down structure were evaluated using the von-Mises stress and equivalent plastic strain (PEEQ), and one of the ship deck was evaluated using deflection of ship deck and equivalent plastic strain. Compared with each cask drop angle conditions, 45 degree of the cask drop angle showed the highest deflection and PEEQ values, but did not exceed ultimate strain of HT36. In the ship deck, the corner of deck showed the highest PEEQ value in all simulation cases. As the result, the 45 degree of the cask drop angle condition results was more conservative than other conditions, and the corners of deck failure was able to evaluate ship safety.

Seismic Analysis of Free-Standing Spent Fuel Dry Storage Cask Considering Soil-Concrete Pad-Cask Interaction

Seungpil Kim,Sang Soon Cho 한국방사성폐기물학회 2023 한국방사성폐기물학회 학술논문요약집 Vol.21 No.2

In the case of dry storage facilities, slipping of the cask or tip-over are dangerous phenomena. For this reason, in dry storage facilities, measures against slipping and tip-over or related safety evaluations are important. Accidental conditions that can cause cask slippage and tip-over in dry storage facilities include natural phenomena such as floods, tornadoes, tsunamis, typhoons, earthquakes, and artificial phenomena such as airplane crashes. However, among natural phenomena, earthquakes are the most important natural phenomenon that causes tip-over. Also, many people had the stereotype that Korea is an earthquake-safe zone before 2016. However, earthquakes become a major disaster in Korea due to the 2016 Gyeongju earthquake and the 2017 Pohang earthquake, followed by the Goesan earthquake in October 2022. In this paper, seismic analysis was performed based on dry storage facilities including multiple casks. Design variables for the construction of an analysis model for dry storage facilities were investigated, and seismic analysis was performed. To evaluate tip-over accident during earthquake, seismic load was used from 0.2 g PGA to 0.8 g PGA and these earthquakes were followed Design Response Spectrum (DRS) in RG 1.60. The friction coefficient of concrete pad was used from 0.2 to 1.0. As a result of the analysis, tip-over accident could not find in the analysis from 0.2 g to 0.6 g. However, tip-over was appeared at friction coefficients of 0.8 and 1.0 at 0.8 g PGA. Tip-over angular velocity of cask was derived by seismic analysis and was compared with formula and tip-over analysis results. As a result, a generalized dry storage facility analysis model was proposed, and dry storage facility safety evaluation was conducted through seismic analysis. Also, tip-over angular velocity was derived using seismic analysis for tip-over analysis.

Numerical Simulation of Spent Nuclear Fuel Transport Casks for Strain-Based Safety Evaluations

Seungpil Kim,Myoungsu Shin 한국방사성폐기물학회 2021 한국방사성폐기물학회 학술논문요약집 Vol.2021 No.11

사용후핵연료 운송용기의 관통 안전성 평가

김승필 ( Kim Seungpil ),신명수 ( Shin Myoungsu ),손동성 ( Sohn Dong-seong ),권혁주 ( Kwon Hyukjoo ) 한국구조물진단유지관리공학회 2019 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.23 No.1

This study examined the safety of nuclear spent-fuel (NSF) transport casks against accidental puncture events. Finite element analyses were conducted according to the accident conditions in NUREG-1536 and RG 7.8, which specify 1-m parallel and vertical drops on a rigid rod that has 15-cm diameter and 20-cm height. We focused on the safety evaluation of the cask body, baskets, and canister based on ASME BPVC Section III, and evaluated whether these elements would undergo excessive fracture or puncture.

위성 자세제어 교육용 시뮬레이터 S/W 개발

김종범 ( Kim Jongbum ),김승필 ( Kim Seungpil ) 공군사관학교 2019 空士論文集 Vol.70 No.-

본 연구는 인공위성 자세제어를 위한 교육용 시뮬레이터를 개발하는 것을 목표로 한다. 이를 위해 센서 및 구동기 관련 기초연구를 진행하였다. 그리고 좌표계 정의, 인공위성 강체 모델링, 지구 및 우주환경 모델링을 수행하였다. 또한 다양한 자세 결정 및 제어 알고리즘을 연구하였다. 각속도 감쇠 모드, 안전 모드, 그리고 임무모드 등 다양한 모드에 대한 자세제어 시뮬레이션을 수행하는 시뮬레이터를 개발하였다. 본 연구를 통해 개발된 시뮬레이터는 실제 개발되는 인공위성 자세제어 검증은 물론 생도 교육에 활용될 수 있을 것이다. The study aims to develop an educational simulator for satellite attitude control. To do this, basic research on sensors and actuator was conducted. And coordinate system definition, satellite rigid body modeling, and earth and space environment modeling were carried out. In addition, various attitude determination and control algorithm were studied. Simulator has been developed to perform simulations for various modes such as detumbling mode, safety mode, and mission mode. The simulator developed through this study will be used for cadet education as well as attitude control verification of actual satellites.

InGaP/GaAs 이중접합 기반의 고효율 플렉시블 태양전지 제조기술 연구

문승필(Seungpil Moon),김영조(Youngjo Kim),김강호(Kangho Kim),김창주(Chang Zoo Kim),정상현(Sang Hyun Jung),신현범(Hyun-Beom Shin),박경호(Kyung Ho Park),박원규(Won-Kyu Park),안연식(Yeon-Shik Ahn),강호관(Ho Kwan Kang) 한국태양광발전학회 2016 Current Photovoltaic Research Vol.4 No.3

III-V compound semiconductor based thin film solar cells promise relatively higher power conversion efficiencies and better device reliability. In general, the thin film III-V solar cells are fabricated by an epitaxial lift-off process, which requires an AlxGa1-xAs (x≥0.8) sacrificial layer and an inverted solar cell structure. However, the device performance of the inversely grown solar cell could be degraded due to the different internal diffusion conditions. In this study, InGaP/GaAs double-junction solar cells are inversely grown by MOCVD on GaAs (100) substrates. The thickness of the GaAs base layer is reduced to minimize the thermal budget during the growth. A wide band gap p-AlGaAs/n-InGaP tunnel junction structure is employed to connect the two subcells with minimal electrical loss. The solar cell structures are transferred on to thin metal films formed by Au electroplating. An AlAs layer with a thickness of 20 nm is used as a sacrificial layer, which is removed by a HF:Acetone (1:1) solution during the epitaxial lift-off process. As a result, the flexible InGaP/GaAs solar cell was fabricated successfully with an efficiency of 27.79% under AM1.5G illumination. The efficiency was kept at almost the same value after bending tests of 1,000 cycles with a radius of curvature of 10 mm.

자동차 헤드램프 에이밍 변화에 대한 원인 분석

김찬중(Chanjoong Kim),박지용(Jiyong Park),고민수(Minsu Ko),김경현(Kyunghyun Kim),이승필(Seungpil Lee) 한국자동차공학회 2021 한국자동차공학회 학술대회 및 전시회 Vol.2021 No.11

산화피막 형성 기술을 이용한 기능성 정밀여과형 TiO₂ 금속막 개발

최승필(Choi Seungpil),김건태(Kim Geontae),김종오(Kim Jongoh) 한국지반환경공학회 2010 한국지반환경공학회논문집 Vol.11 No.10

산화피막 형성 기술(anodization)을 이용하여 나노크기의 TiO₂ 튜브가 표면에 내재된 자기 조직형(self-organized) 광감응 TiO₂ 금속막을 개발하였다. 개발된 TiO₂ 금속막의 특성은 EDX, SEM, XRD로 분석하였고, 전해질 성분과 농도 등에 따른 TiO₂ 나노튜브 형성 유무를 실험적으로 조사하였다. 광반응 특성을 보유한 아나타제형의 나노튜브가 성공적으로 내재된 것을 확인할 수 있었다. 휴믹산을 모델 유기물로 사용하여 광감응 TiO₂ 금속 분리막의 유기물 제거 특성을 실험적으로 검토하였다. A self-organized nano-structured, photocatalytic TiO₂ membrane with large surface area of anatase crystallites was successfully fabricated by anodization. The nano-structured anodized TiO₂ membrane was characterized using EDX, SEM and XRD techniques and the effect of electrolyte type and concentration to fabricate TiO₂ metal membrane was also investigated. Regular nano tubular arrays were obtained By the EDX, SEM and XRD patterns, the anodized TiO₂ membrane showed the enhanced photocatalytic properties of anatase phase. Photocatalytic activities of fabricated TiO₂ metal membrane was also experimentally investigated as model compound of humic acid.