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Yoon-Jin Kim,Yong-Kyun Jang,Woo-Nyon Kim,Min Park,Jun-Kyung Kim,Ho-Gyu Yoon 한국탄소학회 2010 Carbon Letters Vol.11 No.2
Dispersion of the functionalized multiwalled nanotubes (MWNT) in the polyurethane (PU) matrix and DC conductivity of the MWNT/PU composites are investigated with the oxidation conditions, the kind of surfactants and their content. First, the most optimal surfactant type and its critical micelle concentration in the MWNT suspension are determined as a cationic surfactant, benzalkonium chloride (BKC) of 0.6 wt.% to the MWNT content from DEA and FESEM results. All the MWNT oxidized under several conditions are negatively charged and functionalized with carboxylic group, whereas the degree of damage is different from oxidation conditions. In addition, each MWNT/PU composite derived from several oxidation conditions shows different DC conductivity at a characteristic MWNT content. It is found that in order to enhance DC conductivity of the polymeric composites containing the oxidized MWNT the better dispersion of MWNT should be obtained by effective functionalities and surfactant adsorption with preserving the intrinsic geometry of pristine MWNT.
방사선 취급 작업종사자의 개인 피폭선량(Individual Dose)에 관한 연구
동경래(Kyung-Rae Dong) ⋅김창복(Chang-Bok Kim) ⋅박용순(Yong-Soon Park) ⋅지연상(Yeon-Sang Ji) ⋅김치년(Chi-Nyon Kim) ⋅원종욱(Jong-Uk Won) ⋅노재훈(Jae-Hoon Roh) 한국실내환경학회 2009 한국실내환경학회지 Vol.6 No.1
The importance of managing the exposure to radiation for radiological technologist is becoming more conspicuous as modern medical care increases the number of hospital exams involving radiation and as work of radiological technologists expand and increase in areas using advanced medical equipment for diagnosis and treatment purposes involving radiation. Measurements for individual exposure dose to radiation can differ according to the equipment and facilities in the work environment and the average number of exposures an individual is involved in. Therefore, systematic and reasonable controls on the exposure dose to radiation can be attained from core data. Shallow dose/Deep dose measurements were taken according to the year of the measurement, the technologist’s occupation post, gender, department, and age over a five year period from January 1, 2003 to December 31, 2007 using a sample of radiological technologists from ten general hospitals throughout S. Korea. When comparing individual exposure dose of each radiological technologist, there was no significant difference in the mean exposure dose according to the year the measurement was taken (p>0.05). Mean exposure dose for Deep/Shallow according to gender showed that men received significantly higher exposure dose than women (p<0.001). Mean exposure dose for Deep/Shallow according to age showed an increase in exposure dose as age decreases; however, it was not statistically significant (p>0.05). According to occupation post, technologists working in nuclear medicine received significantly higher dose than other occupation posts (p<0.001). The results of individual exposure dose were under the dose limits in accordance to all nuclear regulations. Furthermore, since stochastic effects may occur with long-term exposure to low level radiation, individual exposure dose data was thoroughly managed and the principle of As Low as Reasonably Achievable (ALARA) was implemented when establishing the design of this study.
희토류금속(III) 착물들의 합성과 전자적 구조와 전기화학적 거동에 관한 연구 (II)
최칠남,김세봉,박면용,Chil Nam Choe,Se Bong Kim,Nyon Yong Park 대한화학회 1993 대한화학회지 Vol.37 No.10
란탄나이드 3가($Pr^{3+}$ 와 $Dy^{3+}$)와 유기 리간드를 (phen', terpy') 착물들의 거동을 UV/vis 분광분석, 자기화 그리고 전기화학적 방법에 의해 조사하였다. 착물들의 결정장 갈라짐 에너지 크기와 짝지움에너지 그리고 스핀상태는 착물들의 스펙트라로부터 얻었다. 이들 착물들에 대한 전지화학적 거동은 비수용매속에서 순환 전압전류법에 의해 관찰하였다. 이들 환원피크는 전자 전이에 의한 비가역적인 2단계의 환원 과정이었다. The chemical behavior of trivalent lanthanide ($Pr^{3+}\;and\;Dy^{3+}$) and organo ligands (phen' and terpy') complexes was investigated by the use of UV/vis-spectrophotometric, magnetization and electrochemical method. The magnitude of crystal field splitting energy, the pairing energy and spin state was obtained from the spectra of complexes. These complexes were founded to be diamagnetics, delocalization and low spin complexes. The electrochemical behavior of complexes was observed by the use of cyclic voltammetry in aprotic media. These reduction peaks were irreversible two step reduction processes by electron transfer.