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원전 고등제어 알고리즘 설계를 위한 소규모 시뮬레이터 개발
나만균,심영록,신선호,노희천 조선대학교 에너지.자원신기술연구소 2003 에너지·자원신기술연구소 논문지 Vol.25 No.2
There has been a difficulty in implementing control algorithms (including even proportional-integral-derivative control algorithms) designed to verify and test to many small-scale simulators. In particular, it was almost impossible to implement advanced control algorithms to them. Therefore, it is required to develop a new simulator that facilitates the implementation of advanced control algorithms and the interface between different kinds of application programs. The objective of this work is to improve the existing small-scale simulator (FISA-2/WS) for the Kori unit 2 nuclear power plant and thus enable advanced control algorithms to be tested and verified by being applied to it. The developed simulator consists of FORTRAN, Visual C++, and MATLAB programs and an advanced control method using a receding horizon control method was applied to it to control the steam generator water level.
Prostatic Cancer Presenting as an Isolated Large Lung Mass
No, Hee-Sun,Lee, Jong-Hwan,Ahn, Young,Na, Im-Il,Kim, Hye-Ryoun,Kim, Cheol-Hyeon,Koh, Jae-Soo,Lee, Jae-Cheol The Korean Academy of Tuberculosis and Respiratory 2010 Tuberculosis and Respiratory Diseases Vol.68 No.5
A hidden primary tumor presenting as an isolated lung mass is a diagnostic challenge to physicians because the diagnosis of lung cancer is likely to be made if the histologic findings are not inconsistent with lung cancer. A large lung mass was found incidentally in a 59-year-old man. Although adenocarcinoma was diagnosed by percutaneous needle biopsy, thyroid transcription factor-1 (TTF-1) immunostaining was negative, raising suspicion that there was another primary site. There was no abnormal finding except for the lung mass on a $^{18}FDG$-PET/CT scan and the patient did not complain of any discomfort. Finally, prostatic cancer was confirmed through the study of tumor markers and prostate-specific antigen (PSA) immunostaining. Because of the rare presentation of a single lung mass in malignancies that have another primary site, physicians should carefully review all data before making a final diagnosis of lung cancer.
MONITORING SEVERE ACCIDENTS USING AI TECHNIQUES
No, Young-Gyu,Kim, Ju-Hyun,Na, Man-Gyun,Lim, Dong-Hyuk,Ahn, Kwang-Il Korean Nuclear Society 2012 Nuclear Engineering and Technology Vol.44 No.4
After the Fukushima nuclear accident in 2011, there has been increasing concern regarding severe accidents in nuclear facilities. Severe accident scenarios are difficult for operators to monitor and identify. Therefore, accurate prediction of a severe accident is important in order to manage it appropriately in the unfavorable conditions. In this study, artificial intelligence (AI) techniques, such as support vector classification (SVC), probabilistic neural network (PNN), group method of data handling (GMDH), and fuzzy neural network (FNN), were used to monitor the major transient scenarios of a severe accident caused by three different initiating events, the hot-leg loss of coolant accident (LOCA), the cold-leg LOCA, and the steam generator tube rupture in pressurized water reactors (PWRs). The SVC and PNN models were used for the event classification. The GMDH and FNN models were employed to accurately predict the important timing representing severe accident scenarios. In addition, in order to verify the proposed algorithm, data from a number of numerical simulations were required in order to train the AI techniques due to the shortage of real LOCA data. The data was acquired by performing simulations using the MAAP4 code. The prediction accuracy of the three types of initiating events was sufficiently high to predict severe accident scenarios. Therefore, the AI techniques can be applied successfully in the identification and monitoring of severe accident scenarios in real PWRs.
Ga-Young Lee,Dong-Seon Won,Hyo Jin No,Han-Na Jang,이주연 대한화학회 2009 Bulletin of the Korean Chemical Society Vol.30 No.5
Methyl 2,4-di-(2'-hydroxyethoxy)benzylidenecyanoacetate (3) was prepared and polymerized with terephthaloyl chloride to yield a novel Y-type polyester 4 containing 2,4- dioxybenzylidenecyanoacetate groups as NLOchromophores, which constituted parts of the polymer backbone. The resulting polymer 4 is soluble in common organic solvents such as acetone and N,N-dimethylformamide. Polymer 4 showed thermal stability up to 280 °C in thermogravimetric analysis with glass-transition temperature obtained from differential scanning calorimetry near 108 °C . The second harmonic generation (SHG) coefficient (d33) of poled polymer films at the 1064 nm fundamental wavelength was around 3.54 × 10-9 esu. The dipole alignment exhibited a thermal stability up to near Tg and no significant SHG decay was observed below 100 °C due to the partial main-chain character of polymer structure, which is acceptable for NLO device applications.
Ga-Young Lee,Jin-Hyang Kim,Han-Na Jang,Dong-Seon Won,Hyo Jin No,이범구,Hee-Dok Choi 대한화학회 2009 Bulletin of the Korean Chemical Society Vol.30 No.3
1-{2,4-Di-(2-hydroxyethoxy)phenyl}-2-(2-thienyl)ethene (5) was prepared and condensed with terephthaloyl chloride to yield polyester (6). Polymer 6 was reacted with tetracyanoethylene to give novel Y-type polyester (7) containing 1-(2,4-dioxyethoxy)phenyl-2-{5-(2,2,3-tricyanovinyl)-2-thienyl)}ethenyl groups as NLO-chromophores, which are parts the polymer backbones. Polymer 7 is soluble in common organic solvents such as acetone and N,N-dimethylformamide. It showed thermal stability up to 300 oC in thermogravimetric analysis with glasstransition temperature obtained from differential scanning calorimetry near 134 °C . The second harmonic generation (SHG) coefficient (d33) of poled polymer film at the 1560 nm fundamental wavelength was around 6.74 x 10-9 esu. The dipole alignment exhibited high thermal stability up to the glass-transition temperature (Tg), and there was no SHG decay below 135 oC because of the partial main-chain character of polymer structure, which is acceptable for NLO device applications.
Dietary Exposure and Risk Assessment of Mercury from the Korean Total Diet Study
Kwon, Young Min,Lee, Haeng Shin,Yoo, Dong Chul,Kim, Chun Huem,Kim, Gi Sun,Kim, Ji Ae,Lee, Yu Na,Kim, Young Soon,Kang, Kyung Mo,No, Ki Mi,Paek, Ock Jin,Seo, Jung Hyuk,Choi, Hoon,Park, Sung Kug,Choi, Do Informa UK (TaylorFrancis) 2009 Journal of toxicology and environmental health. Pa Vol.72 No.21
<P>As a national project, obtaining information on the amount of heavy metal exposure of individuals through food intake is an important basic parameter for risk assessment. This study was conducted to evaluate dietary exposure levels and various risks from mercury (Hg) in Korean foods. In total, 342 samples comprising 114 food items were collected and then cooked prior to analysis. As found by Hg analysis, the mean content of metal in the fish and shellfish group was highest among the 15 Korean food groups. The total daily amount of Hg intake from typical Korean foods was 2.40 mug/person/d. The daily amount (mug/person/d) of Hg intake from each food group was 0.155 in grains and cereals, 0.008 potatoes and starch, 0.005 sugars and sweets, 0.0093 pulses, 0.0018 nuts and seeds, 0.203 vegetables, 0.027 fruits, 0.021 meats and poultry, 0.004 eggs, 1.826 fish and shellfish, 0.022 seaweed, 0.043 milk and dairy products, 0.008 oils and fats, 0.042 beverages, and 0.023 seasonings. The fish and shellfish group contributed most to total dietary intake at 76%. For risk assessment, probable daily intake (PDI) was calculated and compared with provisional tolerable weekly intake (PTWI) of the Joint FAO/WHO Expert Committee on Food Additives (JECFA). The level of Hg intake through fish and shellfish of 0.001 mg/kg body weight bw/wk corresponded to 4.54% of the PTWI value of 0.005 mg/kg bw/wk, the safety standard for JECFA. The level of Hg intake through selected foods from the Food list for Koreans was 0.001 mg/kg bw/wk, corresponding to 5.95% of PTWI value. Therefore, overall intake was at levels below the recommended JECFA levels. The relative gender Hg hazard from Korean foods was 6.26% and 5.5% for males and females, respectively. The relative age Hg hazard from Korean foods was, 8.9% in those 3-6 yr old, 6.7% in those 7-12 yr old, 5.2% in those 13-19 yr old, 5.9% in those 20-29 yr old, 6.3% in those 30-49 yr old, 5.6% in those ages 50-64 yr, and 3.7% in the group of those over 65 yr of age. Relative regional Hg hazard from Korean foods was 6.3% in urban versus 5.5% in rural areas. Thus, the amount of Hg intake through consumption of Korean foods was found to be at a relatively safe level. These data may be thus used to establish safety standards for fish and shellfish consumption.</P>