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4-(Nitrobenzyl)Pyridine에 의한 알킬화합물들의 잠재적 변이원성에 대한 구조활성 및 광화학효과의 연구
김재현(Jae-Hyoun Kim),엄애선(Ae-Son Om),류재천(Jae-Chun Ryu) 한국환경성돌연변이발암원학회 2001 한국환경성돌연변이·발암원학회지 Vol.21 No.1
The NBP assay was conducted to determine the photomutagenic or photocarcinogenic potential of alkylating agents. Using a 4-NBP in vitro technque, whereby photochemical treatment on CAS (Chemical Activation System) was performed to invetigate the enhancement effect, 20 compounds were shown to undergo alkylating mechanisms with 4-NBP. Chemically meaningful results were obtained with different sets of 20 compounds for the alkylating activities due to the UV irradiation, demonstrating that all of the testing compounds<br/> showed increasing photoalkylating effects either in the presence or absence of CAS in comparison with previously reported data, except furoic acid and fumaric acid that showed decreasing effect in the presence of a CAS. Caffeine did not show a meaningful result either. However, these findings demonstrate the effects of potential photoalkylating activity in chemical activation system (CAS) and suggest a potential risk-ranking system for the in vivo assays.
김재현 ( Jae Hyoun Kim ),김영록 ( Yeong Rok Gim ),정미현 ( Mi Hyun Chung ),강민구 ( Min Goo Kang ) 한국컴퓨터교육학회 2013 한국컴퓨터교육학회 학술발표대회논문집 Vol.17 No.2
최근 등장한 스마트 기기로 인해 일상생활에서의 급격한 변화가 일어나고 있다. 이에 21세기 인재가 갖추어야 할 핵심 역량 중 창의성과 인성에 대한 관심이 높아지고 있으며, 이를 함양하기 위한 교육에 대한 변화가 요구되고 있다. 본 논문에서는 스마트 콘텐츠와 앱 스토어에서 발생하는 새로운 개념인 ‘앱 경제’의 경쟁력을 확보하기 위해 장기적인 관점에서 초등학교에서의 정보과학 교육 실태에 대하여 분석하고자한다. 현재 초등학교 교육과정에서 창의·인성교육에 대한 현황 및 문제점을 알아보고, 해외 주요국가의 정보과학 교육 현황과의 비교분석을 통해 미래사회의 인재 양성 방안에 대하여 논의해보고자 한다.
음용수의 염소살균부산물(DBPs)인 염화지방족화합물의 QSAR 독성예측치에 대한 열역학적 분자표현자의 역할(Ⅱ)
김재현(Jae Hyoun Kim),조진남(Jinnam Jo) 한국환경성돌연변이발암원학회 2001 한국환경성돌연변이·발암원학회지 Vol.21 No.2
The predictive screening of various molecular descriptors for predicting carcinogenic, mutagenic, teratogenic and alkylation activity of chlorinated disinfection byproducts (DBPs) has been investigated for the application of quantitative structure-activity relationships (QSAR). The toxicity index for 29 compounds were<br/> computed by the PASS program and active values were employed in this study. Studies show that different descriptors account for the model equation of each genotoxic endpoint, and that thermodynamic descriptors significantly played a major role on prediction of endpoints of chlorinated aliphatic compounds.
김재현(Jae-Hyoun Kim),우정수(Jung-Su Woo),허미선(Mi-Sun Hur),이규석(Kyu-Seok Lee) 대한체질인류학회 2014 해부·생물인류학 (Anat Biol Anthropol) Vol.27 No.4
한국성인 시신 팔신경얼기 20쪽에서 위와 아래어깨밑신경의 분지양상과 분지되는 가지의 개수를 확인하고, 근육에 분포하는 각 가지들의 척수신경의 구성을 확인하는 데 이 연구의 목적을 두었다. 위어깨밑신경이 3개의 가지로 일어나는 유형을 16쪽(80.0%)에서 관찰하였고, 4개의 가지로 일어나는 유형을 4쪽(20.0%)에서 관찰하였다. 아래어깨밑신경은 2개의 가지로 나뉘어져 어깨밑근과 큰원근에 각각 하나씩 분포하였다. 위어깨밑신경의 가지들은 척수신경 구성에 따라 7가지 유형으로 분류하였다. 첫째, 둘째, 셋째 가지는 다섯째와 여섯째 목신경으로 구성된 유형이 가장 많았고, 넷째 가지는 모두 여섯째 목신경으로만 구성되었다. 아래어깨밑신경은 척수신경 구성에 따라 각각 세 유형으로 분류하였으며, 어깨밑근에는 다섯째 목신경만 분포하는 유형이 11쪽(55.0%)으로 가장 많았고, 큰원근에는 여섯째와 일곱째 목신경이 분포하는 유형이 13쪽(65.0%)으로 가장 많이 관찰되었다. This study aimed to determine the number of branches of the upper and lower subscapular nerves and to classify the spinal nerve compositions of each branch. Twenty sides of the brachial plexus extracted from Korean adult cadavers were used in this study. The upper subscapular nerve was composed of three branches in 16 sides (80.0%), composed of four branches in 4 sides (20.0%). The lower subscapular nerve arose from posterior cord with one branch, innervating the subscapularis and the teres major muscles. In case of the upper subscapular nerve, the first branch was comprised of C5 in 40.0%, C5 and C6 in 60.0%, the second branch was composed of C5 in 15.0%, C5 and C6 in 85.0%, the third branch was arisen from C5 and C6 in 75.0%, C6 in 25.0% and the forth branch appeared in four sided was derived from C6. The nerve branch innervating the subscapularis muscle was composed of C6 in 55.0%, C5 and C6 in 40.0%, C6 and C7 in 5.0%. The nerve branch innervating the teres major muscle was composed of C6 and C7 in 65.0%, C5, C6 and C7 in 25.0%, and C6 in 10.0%. The injury was often due to an accidental damage or lesion of the subscapular nerve, these anatomical results may be helpful to predict the involving area of the lesion.
PCBs의 광화학적 연구: NaOH 및 휴믹산 (humic acid, HA)에 의한 분해특성
신혜승,김재현,Shin, Hae Seung,Kim, Jae Hyoun 한국환경보건학회 2014 한국환경보건학회지 Vol.40 No.2
Objectives: This study was carried out to examine whether the apparent photolysis with or without sensitizers [NaOH and humic acid (HA)] was prompted photodegradation of polychlorinated biphenyl (PCB) in aqueous solution. Methods: PCBs photodegradation occurred using fluorescence black lamps at ${\lambda}_{max}=300nm$. PCB congeners were exposed in 10 ppm HA or 0.05N NaOH solutions, to investigate the decreasing profile of PCB concentration with time. The PCBs were then analyzed by gas chromatography/mass spectrometry (GC-MS). Reductive degradation profile of PCB congeners in the presence of both sensitizers under oxygen-saturated protic conditions was described using the wind-rose diagrams. Results: Use of HA or NaOH decreased PCB concentration with time in the dark and on irradiation, indicating that photolysis underwent through reductive dechlorination through energy transfer and possibly with reactive oxygens. The dechlorination was marked by a chromatographic shift, observed in the GC-MS plots. Therefore it is logical to assume that increasing the dose of sensitizers would increase the photodegradation rates of PCBs. The half-lives of pentachloro-PCB (penta-3) in 0.05N NaOH and 10 ppm HA were estimated at about 47 hours and 39 hours, respectively, under the same experimental conditions of photolysis. It was found that the rate of photolysis of pentachloro-PCB in aqueous solution followed apparent first-order kinetics compared to other congeners. Conclusion: Photochemical degradation (using 328 nm UV light) of penta- and hexa-PCBs in HA or alkaline solution is a viable method for pretreatment method. The results are helpful for the further comprehension of the reaction mechanism for photolytic dechlorination of PCBs in aquatic system.
50%TiO<sub>2</sub>/6%WO<sub>3</sub> 졸 용액에서의 톨루엔 처리에 대한 아세톤의 광활성 증가효과
신혜승,김재현,Shin, Hye-Seung,Kim, Jae-Hyoun 한국환경보건학회 2012 한국환경보건학회지 Vol.38 No.3
Objectives: The photocatalytic degradation of toluene in a batch mode photoreactor for the purpose of the hazardous waste treatment was investigated. Methods: Kinetic experiments using a low pressure mercury lamp (Lambda Scientific Pty Ltd, 50 Watt) emitting both UV and visible light were performed at $31^{\circ}C$ over toluene concentrations ranging from 10 to 50 mg/l in water with $50%TiO_2/6%WO_3$ (TW) concentration of 1 g/l at a pH of 6. Results: Kinetic studies showed that $50%TiO_2/6%WO_3$ (TW) photocatalyst was highly active in toluene degradation; we observed that 99% of the pollutant was degraded after six hours under visible irradiation; furthermore, we observed that adsorption onto TW catalyst was responsible for the decrease of toluene with pseudo-first order kinetics. It was also found that oxygen as a radical source in the sol medium played a significant role in affecting the photodegradation of toluene, especially with a two-fold elevation. This increase was achieved by a more than four-fold elevation of the photodegradation of toluene in the presence of acetone than without, presumably via an energy transfer mechanism. Conclusions: We concluded that photodegradation in acetone and oxygen molecules along with TW was an effective method for the removal of toluene from wastewater.
알킬페놀 화합물의 HeLa cell (HL-60)의 세포독성에 대한 QSAR연구
김명길(Kim Myung-Gill),김재현(Kim Jae-Hyoun) 환경독성보건학회 2003 환경독성보건학회지 Vol.18 No.4
The purpose of the present study was to perform experiments of cytotoxicity using HeLa cell and to evaluate the possibility that QSAR is applicable 10 the cytotoxicity of alkylphenols. Higher toxicities were found in four alkylphenols in the following order: 4-n -Nonylphenol >4-tert-Octylphenol > 4-n-Octylphenol > 4-n-Heptylphenol. Whereas other alkylphenols were apparently less toxic. By using Percent Hydrophilic Surface Area (PHSA) quantitative structure-activity relationships (QSARs) models were developed: Cytotoxicity (%) = 90.14089-4.72224 PHSA (R²=0.2046, α=0.0265). It is concluded that some of the obtained data are useful to determine whether QSAR methods can be of general use in predicting that until further work is undertaken to develop QSARs for a much wider range of homologous series of alkylphenol compounds.