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이세기,문덕환,이채관,황용식,선병관,손병철,김대환,이창희,김휘동,이채언 인제대학교 백병원 2002 仁濟醫學 Vol.23 No.5
Objectives: For the purpose of preparing the fundamental data and assessing the status of exposure level of chemical substances in painting process. Methods and Materials: The author determined the concentration of organic solvents, lead(Pb), Chromium(Cr), and Toluene-2, 4-diisocyanate(TDI) in air of painting process to 90 industries classified by 15 types of manufacturing industry during a period from Jan. 1st 2001 to Dec. 31st 2001. Results: The results were as follows: 1. The geometric mean level of each chemical substance was 0.1706 ppm for exposure index in organic solvents, 0.0019㎎/㎥ for Pb, 0.0024 ㎎/㎥ for Cr, and 0.0004ppm for TDI, respectively. 2. The exposure level of each chemical substances by type of painting was the highest in dipping and brush painting for organic solvent, in spray-painting for TDI, and in spray gun-painting for Pb and Cr, respectively. 3. The exposure level of each chemical substances by type of local ventilation equipment was higher in enclosed and booth type for organic solvents. Cr, and TDI, and in exterior type for Pb, respectively than those of other types. 4. The exposure level of each chemical substances by type of hazardous material arresting media was higher in using water for organic substances, in using bag filter for Pb, TDI, respectively than those of other types. Conclusion: According to above results, this study suggests that the exposure level by type of industry exceeded the exposure level in wooden furniture and metal furniture manufacturing industry for organic solvents and Pb, respectively.
Cho, Changsoon,Kang, Hyunbum,Baek, Se-Woong,Kim, Taesu,Lee, Changyeon,Kim, Bumjoon J.,Lee, Jung-Yong American Chemical Society 2016 ACS APPLIED MATERIALS & INTERFACES Vol.8 No.41
<P>This paper reports the distinct roles- of Au and Ag nanoparticles; (NPs) in organic light-Orating-diodes (OLEDS) depending on their sizes. Au and Ag-NPs that.are 40 arid 50 nm in size, respectively, are the most effective for enhancing the performance of green: OLEDs. The external quantum efficiencies (EQEs): of green OLEDs doped with An and Ag N.Pg, (40 and 50 rim, respectiVely) are improved by 29.5% and 36.1%, respectively, while the power. efficiencies (PE8) are enhanced by 47.9% and 37.5%, respectively. Furthermore, combining the Au and Ag NPs produces greater enhancements. The EQE and PE of the coci-oped OLEDs are improved by 63.9% and 68.8% respectively,-.through the synergistic behavior of the different NPs. Finite difference time-domain simulations confirm that the localized surfaee:plasmon resonance of the Au NPs near 580 nth improves the radiative recombination rate (k(rad)) of green-light emitters locally (<50 pm), while the Ag NPs cause relatively long, range and broadband enhancements in k(rad). The-Simulations of 'various domain sizes. Verify that the light-extraction efficiency (LEE),can, be enhanced by More than 4.2% by applying Ag NPS.. Thus, size-controlled Au and Ag NPs can synergistically enhance LEDS by improving both the internal quantum efficiency and LEE.</P>
오병훈,권준수,남궁기,김승현,지익성,김창윤,하규섭,박원명,김성곤,오강섭,김정범,이수정,정한용,이창욱,박용천,이영문,김세주,이병욱 大韓神經精神醫學會 2005 신경정신의학 Vol.44 No.5
Four Years Reports of "Journal of Korean Neuropsychiatric Association" during 2001 to 2005 were evaluated by 18 Editorial Board of Korean Neuropsychiatric Association. We investigated the articles to specific fields and rejection rate etc. by different section chiefs. Although several problems concerning review time duration and rejection guideline issues indicated but generally all reviewer processes proved relatively clear and concise criteria. Through these objective and systematic evaluation Processes, "Journal of Korean Neuropsychiatric Association" will develop a good journal.
이금분,이세열,김용수 大田大學校 産業技術硏究所 2001 산업기술연구소 論文集 Vol.12 No.2
This paper presents an image contrast enhancement technique for enhancing the low contrast images using the fuzzy neural network. The low pictorial information of a low contrast image is due to the vagueness or fuzziness of the multivalued levels of brightness rather than randomness. Fuzzy image processing technigue has three main stages, namely, image fuzzification. modification of membership values, and image defuzzification. For the fuzzification and defuzzification, we need to select a suitable crossover point. The problem of crossover point selection can be considered as the two-category classification problem. The fuzzy neural network is used to classify the image into two classes. The proposed method is applied to several experimental images with 256 gray levels and the results are compared with those of the histogram equalization technique. We utilized the index of fuzziness as a measure of image quality. The results show that the proposed method is better than the histogram equalization technique.
이덕형,이용근,최세영 연세대학교 산업기술연구소 1992 논문집 Vol.24 No.2
Autoclaved hydrate of CaO-SiO₂-H₂O system was investigated according to CaO/SiO₂ mole ratio and the condition of hydrothermal treatment. Residual product for extraction of alumina from hydrochloric acid treated domestic kaolin and Ca(OH)₂ were used as the source of SiO₂ and CaO, respectively. The main crystalline phases were C-S-H(I), tobermorite, xonotlite and transformed in order of C-S-H(I) → tobermorite → xonotlite as hydrothermal temperature, time, CaO/SiO₂ mole ratio increase. The porosity and absorption were increased with increasing CaO/SiO₂mole ratio and hydrothermal treatment time. The bending strength was dependent on the balanced bond between the residual and hydrothermal products, and tended to be maximum at CaO/SiO₂ of 0.6, and hydrothermal temperature of 140℃.
이용호,김홍래,백세민 大韓成形外科學會 1983 Archives of Plastic Surgery Vol.10 No.1
Tumors involving the parapharyngeal space present a formidable challenge to the surgeons with regard to the specific technique of their surgical removal. Preoperative evaluation of the sialography combined with CT scanning allows a more accurate assessment of the tumor. Recently authors have experienced 4 cases of tumor involving the parapharyngeal space and have reviewed the rational surgical approach for tumors of this space.
李한배,李庸揆,吳世汎,片宗根 명지대학교 공학기술연구소 1988 공학기술연구소 논문집 Vol.3 No.-
In harbor design, it is a necessary condition to retain calmness inside a harbor. For this purpose, breakwaters are disposed as exterior structures against incident waves. There are cases that necessitate main and auxiliary breakwaters according to frequent directions of incident waves. In these cases, harbor entrances have various geometric shapes in horizontal plane. In the program developed here, harbor entrances are classified into six different cases by the disposition of breakwaters and the attack angle of incident waves. For each case, the diffraction phenomena inside and around harbor entrance are analysed by superposing the solutions of Sommerfeld's. The method gives fairly good results compared with those reported before, and also is proved to be computationally very efficient. Therefore, the method may be applicable to the preliminary design of breakwater dispositions, and also the program can be used as the basic subroutine in the calculation of wave height distributions inside a harbor with reflected waves.