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고준위폐기물 다발의 배열구조변화에 따른 가압경수로(PWR)용 고준위폐기물 처분용기의 구조해석
권영주,Kwon, Young-Joo 한국전산구조공학회 2010 한국전산구조공학회논문집 Vol.23 No.3
가압경수로(PWR)에서 배출되는 고준위폐기물을 지하 500m의 화강암 암반의 처분장에 장기간(약 10,000년 동안) 처분하기 위하여 여러 구조적 안전성 평가 수행을 통하여 처분용기모델이 개발되었다. 기존에 설계 개발된 가압경수로용 처분용기 모델은 구조적으로 처분용기 내부에 정사각형 단면의 네 개의 고준위폐기물 다발이 처분용기 단면의 중심에 대칭되게 나란히 배열된 형태를 취하고 있다. 그러나 이와 같은 배열 형태가 최선의 구조인지는 아직 결정할 수 없다. 왜냐하면 나란한 배열구조의 처분용기는 정사각형 다발단면의 외곽모서리와 외곽 쉘과의 거리가 가장 짧아 경량화를 위한 단면 직경 축소에 한계가 있기 때문이다. 따라서 처분용기 단면 중심에 대하여 대칭형이면서 나란하게 배열된 네 개의 고준위폐기물 다발 각각을 각 다발의 중심에 대하여 일정 각도 회전하여 처분용기 단면 중심 면에 대하여 대칭성을 유지하면서 고준위폐기물 다발이 배열된 처분용기구조에 대한 구조안전성 평가가 매우 필요하다. 비록 지금까지의 연구에 이러한 회전된 다발의 배열단면을 갖는 처분용기는 발견되지 않지만 처분용기모델들의 구조적 안전성 비교 연구를 위해서 고준위폐기물 다발이 회전된 배열단면 변화에 따른 처분용기에 대한 구조해석이 요구된다. 따라서 본 연구에서는 네 개의 고준위폐기물 다발이 각각 다발의 중심에 대하여 일정각도 회전하여 처분용기 중심 면에 대하여 대칭적으로 배열된 단면의 가압경수로용 처분용기에 대하여 구조해석을 수행하였다. 구조해석을 수행한 결과 기존의 설계 개발된 처분용기 단면의 중심에 대칭되게 나란히 고준위폐기물 다발이 배열된 단면의 처분용기보다 다발의 중심에 대하여 일정각도(30~35도) 회전하여 처분용기 중심 면에 대하여 고준위폐기물 다발이 대칭적으로 배열된 단면의 처분용기가 구조적으로 좀 더 안정성이 있음이 밝혀졌다. A structural model of the SNF(spent nuclear fuel) disposal canister for the PWR(pressurized water reactor) for about 10,000 years long term deposition at a 500m deep granitic bedrock repository has been developed through various structural safety evaluations. The SNF disposal baskets of this canister model have the array type of which four square cross section baskets stand parallel to each other and symmetrically with respect to the center of the canister section. However whether this developed structural model of the SNF disposal canister is best is not determinable yet, because the SNF disposal canister with this parallel array has a limitation in shortening the diameter for the weight reduction due to the shortest distance between the outer corner of the square section and the outer shell. Therefore, the structural safety evaluation of the SNF disposal canister with the rotated basket array which is also symmetric with respect to the canister center planes is very necessary. Even though such a canister model has not been found as yet in the literature, the structural analysis of the canister with the rotated basket array for the PWR is required for the comparative study of the structural safety of canister models. Hence, the structural analysis of the canister with the rotated basket array in which each basket is rotated with a certain amount of degrees around the center of the basket itself and arrayed symmetrically with respect to the center planes is carried out in this paper. The structural analysis result shows that the SNF disposal canister with the rotated basket array in which the SNF disposal basket is rotated as 30~35 degrees around the center of the basket itself is structurally more stable than the previously developed SNF disposal canister with the parallel basket array.
권영주 대한기계학회 2010 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.24 No.2
This paper presents a numerical analysis for the structural strength comparison of the St. Jude Medical bileaflet mechanical heart valve prosthesis with flat leaflet and the Edwards MIRA bileaflet mechanical heart valve prosthesis with curved leaflet. Computer aided engineering systems are used in the analysis. The blood fluid pressure is applied to both flat and curved leaflets of the bileaflet mechanical heart valve prostheses for the rigid body dynamic analysis to confirm the almost same dynamic characteristics of both flat and curved leaflet motions. Thereafter, using the same blood fluid pressure and dynamic characteristics of leaflet motions, structural mechanic analyses for both flat and curved leaflets of the mechanical heart valve prostheses are carried out to show quite different stress and deformation results, respectively. Conclusively, from the viewpoint of stress, it is revealed that the St. Jude Medical bileaflet mechanical heart valve prosthesis is structurally stronger and better than the Edwards MIRA bileaflet mechanical heart valve prosthesis. Computer aided engineering systems used in this comparative structural analysis are ADAMS for the rigid body dynamic analysis, and NISA for the structural mechanic analysis.
A New Catalog of Silicate Carbon Stars
권영주,서경원 한국천문학회 2014 Journal of The Korean Astronomical Society Vol.47 No.4
A silicate carbon star is a carbon star which shows circumstellar silicate dust features. We collect a sample of 44 silicate carbon stars from the literature and investigate the validity of the classification. For some objects, it is uncertain whether the central star is a carbon star. We confirm that 29 objects are verified silicate carbon stars. We classify the confirmed objects into three subclasses based on the evolution phase of the central star. To investigate the effect of the chemical transition phase from O to C, we use the radiative transfer models for the detached silicate dust shells. The spectral energy distributions and the infrared two-color diagrams of the silicate carbon stars are compared with the theoretical model results. For the chemical transition model without considering the effect of a disk, we find that the life time of the silicate feature is about 50 to 400 years depending on the initial dust optical depth.
생활폐기물 소각재와 정수 슬러지를 사용한 보조기층재 개발
권영주,이병하 한국폐기물자원순환학회 2013 한국폐기물자원순환학회지 Vol.30 No.1
Recycling of bottom ash which is the part of the non-combustible residues of waste combustion is very important for saving energy and resource recycling. In this research, we tried to develop recycling method for the bottom ash as the roadbase, the layer of aggregates under the paved layer of a road. We first removed ferrous and non-ferrous metals from the bottom ash with a 20 mm mesh strainer. After grinding ceramics and glass using jaw crusher, we mixed them with the bottom ash, and then they were further finely grounded up to the particle size less than 150 mm with ball mill. XRD analysis of the final ground material showed that the main ingredients were CaO, SiO2, Al2O3, P2O5, Fe2O3 and MgO. Also there were some heavy metals such as Cu2+, Pb2+ and Cr6+ in it. To make roadbase out of the processed bottom ash, we mixed it with purified sludge, pink kaolin (from Hadong, Gyeongnam, Korea), and silica sludge, and fired in an electric kiln at 1150 ~ 1200oC. Finally, the usefulness of the roadbase made of bottom ash was analyzed by testing absorption rate, crystallizing and strength as well as indoor California Bearing Ration (CBR) test, abrasion test, sand reduction test. The developed material from recycling the wasted bottom ash satisfied the requirement of roadbase properties.
Curcumin as a Cancer Chemotherapy Sensitizing Agent
권영주 한국응용생명화학회 2014 Applied Biological Chemistry (Appl Biol Chem) Vol.57 No.2
The development of cancer chemotherapy made asignificant progress in cancer treatment. However, most chemotherapeuticdrugs are challenged by drug resistance and druginducedtoxicity. Combination therapy has been suggested as aneffective strategy to avoid drug resistance and reduce toxicityderived from drug, thereby enhancing clinical treatment of cancer. Many food-derived bioactive compounds have exhibited anticanceractivity and can be good candidates for combination therapy withexisting chemotherapeutic drugs. Curcumin is one of compoundsthat present anticancer activity in many types of cancer and hasbeen extensively studied for its anticancer mechanisms includinginhibition of nuclear factor kappa-light-chain-enhancer of activatedB cells (NF-κB) activation. Combinational treatment of curcuminenhanced therapeutic efficacy of traditional chemotherapeuticdrugs, cisplatin, doxorubicin, 5-fluorouracil, and gemcitabine. NF-κB is a major downstream effector that leads to chemoresistanceof many therapeutic drugs. Down-regulation of NF-κB by curcuminis an effective mechanism to sensitize chemotherapeutic drugs andincrease therapeutic efficacy. Therefore, combination use of curcuminand available anticancer drugs has great potential to enhancechemotherapy efficacy and improve clinical treatment of cancer. More studies will be required to elucidate cause effect relationshipof curcumin-induced suppression of cell survival pathways andenhancement of drug efficacy by curcumin.
권영주,강길모,박세헌 한국혁신학회 2017 한국혁신학회지 Vol.12 No.2
In this study, it is anticipated that there will be technical dominance based on the ocean and the industrial demand using marine resources will be further increased in the future. We will analyze the science and technology of the marine field for the Fourth Industrial Revolution. It will be suggested safety harbor technology considering the product life cycle, big data utilization for marine forecasting, technology that restores the health of the marine ecosystem, and artificial intelligence submarine robots were proposed as future technologies. Future technologies include drone technology, Information & Communication Technology (ICT)-based marine leisure services, high value marine leisure equipment technology, equipment and material technology for equipment and material for extreme environments, new material technology utilizing marine fisheries resources, marine fisheries bio factory technology, Operation and consolidation technology for offshore plants. IoT-based shipping, harbor, logistics service development, ship autonomous navigation technology, ICT smart aquaculture industry technology, and seabed structure construction core technology development. 본 연구에서는 제4차 산업혁명의 특징 및 미래신산업 발굴을 위한 해양분야의 기회영역별 해양과학기술을 분석하고, 해양 중심의 지속가능한 발전을 위해 향후 추진방향을 전망하고자 한다. 기술혁신을 기반으로 한 4차 산업혁명 기술에 접목될 수 있는 해양분야는 빅데이터, 증강현실, 드론, 로봇 등의 신기술과 IoT 기술의 융복합을 중심으로 가속화 되고 있다. 현재 해양 R&D 중점개발 기술은 미래해양자원, 해양청정에너지, 해양환경, 해양생명공학, 해양장비개발 및 인프라 구축, 해양과학조사 및 예보, 해양안전 및 교통시설, 첨단항만⋅물류 기술개발, 대형 연구인프라 구축 등에 투자되고 있다. 하지만, 안전한 해양공간 조성, 해양환경 개선 등을 위해 Safety 항만기술, 빅데이터 활용 해양예보 기술, 해양생태계 건강성 복원 기술, 인공지능 해저로봇기술 등이 기회영역 분야로 주목받고 있다. 또한, 신산업 분야의 핵심기술을 선도하고자 수공양용 무인이동체 기술, ICT기반 해양레포츠 서비스 및 고부가가치 해양레저장비 기술, 극한지 활용 장비⋅소재 기술, 해양수산자원을 활용한 신물질 기술 및 해양수산 바이오 팩토리 기술, 해양플랜트 운영⋅해체 기술 등이 거론되고 있다. 마지막으로 해운물류⋅항만, 수산 등 기존 산업분야의 위기를 극복하고 신성장동력을 창출하기 위해, IoT기반 해운⋅항만⋅물류서비스 개발, 선박 자율운항 기술, ICT 활용 스마트 양식기술, 해저구조물 건설 핵심기술개발 등이 제안되고 있다.