Coumarin 유도체의 전기화학적 분석

김일광,한현호 圓光大學校 基礎自然科學硏究所 1989 基礎科學硏究誌 Vol.8 No.1

The extract and a electrochelnical analysis for coumarin and 7-acetoxy-4-(bromomethyl) coumarinin serum have been investigated. The simultaneous analysis of coumarin and 7-acetoxy-4-(bromomethyl) coumarin by differential pulse polarographic method was conducted using 0.1M tetraethyl ammonium perchlorate supporting electrolyte and Ag-AgCl reference electrode in acetonitrile after extractionon C_18 Sep-Pak columm. The cathodic halfwave potential for coumarin and 7-acetoxy-4-(bromomethyl) coumarin were about -1.63vo1ts and -0.36vo1ts respectively. The recoveries for coumarin and7-acetoxy-4-(bromoethyl) coumarin on C_18 Sep-Pak column with acetonitrile were more than92% in serum.

[화학] 폴리(에테르)사슬이 결합된 Cobalt(Ⅱ)bipyridine 착물의 합성과 전기화학적 성질

김일광(Il Kwang Kim),전일철(Il Chul Jun),Royce W. Murray 한국분석과학회 1996 분석과학 Vol.9 No.3

국민체육진흥기금 지원 공공체육시설 운영 개선방안: 국민체육센터를 중심으로

김일광(Kim, Il-Gwang),박성택(Park, Seong-Taek),김미숙(Kim, Misuk),박수선(Park, Su-Sun) 한국스포츠산업경영학회 2020 한국스포츠산업경영학회지 Vol.25 No.6

본 연구는 기금지원사업으로 조성된 공공체육시설의 운영현황과 문제점 및 개선 사항을 파악하여 시설의 국민체육진흥기금 지원 체계 개선방안을 도출하였다. 이를 위해 2019년 지자체에서 운영하고 있는 17개 시·도의 국민체육센터 중 총 9개 기관의 시설운영 관리자 9명을 심층 면접하였으며, 면접 결과를 질적 연구 방법 중 다중 사례연구 방법으로 분석하였다. 분석 결과 운영자가 인식하는 주요 문제로는 ‘시설 설립단계에서의 전문가 배제’, ‘이용자 욕구를 반영하지 못한 운영체계’, ‘다양한 민원에 대응하는 적은 예산’, ‘운영비에 따른 공공체육시설의 지역 격차’, ‘운영 종사자들의 업무 과부하’로 나타났다. 이를 개선하기 위한 방법으로는 ‘지역중심 공공체육시설 설립 시스템 구성’, ‘시설관리 운영지원 기준안 마련’, ‘공공체육시설 종사자의 업무환경 및 처우개선’으로 나타났다. 이상과 같은 연구결과를 토대로 지역맞춤형 공공체육시설로의 개선, 지역사회 체육시설과의 네트워크를 통한 지역중심 체육활동 극대화 방안 마련, 효율적인 기금지원모델 방안 구축, 공공체육시설 관련 정책의 전반적인 추친체계 정비 등의 제언을 제시하였다. 본 연구는 다중 사례 면접을 통해 현재 해당 업무를 담당하고 있는 관리 및 운영자가 인식하는 주요 문제 뿐 아니라 개선방법들을 실제 현장 사례들을 근거로 제시하였다는 것에 의의가 있다. This study identified the operational status, problems, and improvements of public sports facilities created as a fund support project to derive measures to improve the support system for the National Sports Promotion Fund. To this end, in-depth interviews were conducted with 9 facility management managers from a total of 9 institutions out of 17 municipal and provincial national sports centers operated by local governments in 2019. Interview results were analyzed by multiple case study methods among qualitative research methods. As a result of the analysis, the main problems recognized by the operator include "exclusion of experts at the facility establishment stage", "operation system that does not reflect user needs", "small budget to respond to various civil complaints", "Regional gap in public sports facilities according to operating expenses", "Working overload of operations workers". Methods to improve this were "composition of a system for establishing a regional-centered public sports facility", "preparation of a standard for facility management operation support", and "improving the work environment and treatment of workers in public sports facilities". Based on the above findings, suggestions such as improvement of regional customized public sports facilities, preparation of measures to maximize regional-oriented sports activities through networks with community sports facilities, establishment of efficient fund support models, and overall improvement of policies related to public sports facilities were presented. It is meaningful that this study, through multiple case interviews, not only the key issues recognized by the management and operator currently in charge of the work, but also the methods of improvement were based on actual field cases.

항갑상선 물질(2-mercapto-1-mathyl-imidazole : MMI)의 전기화학적 분석 : 2-mercapto-1-mathyl-imidazole : MMI

金日光,千賢子 圓光大學校 基礎自然科學硏究所 1994 基礎科學硏究誌 Vol.13 No.2

The determination of 2-mercapto-1-methyl-imidazole (MMI) in 5.0×10exp(-2)M lithium perchlorate solution has been investigated by the differential pulse polarography. The optimum condition in determination of MMI was as fellows: -0.9 volts initial potential, 0.08㎷ pulse height, 2㎷/sec scan rate, and medium mercury drop size. Calibration curve has shown a good linearlity in the range of 1.0×10 exp (-7)M to 8.0×10exp (-5)M and the detection limit has been 2.2×10exp (-9)M. This method has been applicable for the determination of MMI in thyroid drug without interference of addtives.

Acetonitrile 용액중에서 살충제 O, O-Dimethyl-O-(3-Methyl-4-Nitrophenyl)-Phosphorothioate (Fenitrothion)의 전기화학적 환원

金日光,金潤根,千賢子 圓光大學校 基礎自然科學硏究所 1989 基礎科學硏究誌 Vol.8 No.3

계민활성 micelle을 형성하는 acetonitrile 용액에서 O,O-dimethyl-O-(3-methyl-4-nitrophenyl)-phosphorothioat(Fenitrothion)의 전기화학적 환원을 direct current 및 differential pulasepolarography, cyclic voltammetry 그리고 controlled potential coulometry 방법으로 연구하였다. Fenitrothion의 환원 과정은 1단계로 4 전자 이동에 의한 부분 가역적 전자이동 화학반응 (EC, EC)기구로 O,O-dimethyl-O-(3-metbyl-4-hydroxyaminophenyl)-Phosphorothioate를 형성하고, 더 높은 음전위에서 2 전자 이동에 따른 양성자 반응으로 phosphorus 원자와 phenoxy group의 단일 결합이끊어지면서 주생성물인 P-amino-m-cresol과 dimethyl thiophosphinic acid를 생성하였다. Sodiumlauryl sulfate micelle 용액에서 polarography 환원파는 전체적으로 억제 되었으며 특히 1차 환원파는 음이온 micelle의 선택적 작용으로 2단계로 분리되었다. The electrochemical reduction of O,O-dimethyl-O-(3-methyl-4-nitropheny1)-phos-phorothioate(Fenitrothion) has been studied in acetonitrile solution containing surfactant micelleby direct current (DC)-differential pulse (DP) polarography, cyclic voltammetry (CV) and controlled potential coulometry (CPC). The partially reversible clectron transfer-chemical reaction(EC,EC mechanism) of fenitrothion reduction proceeded by four electron transfer to form O.0-dimethyl-O-(3-methyl-4-hydroxyaminophenyl)-phosphorothioate which undergoes sing1e bond of the phosphorus atom and phenoxy group cleaves to give p-amino-m-cresol and dimethyl thiophosphinic acid as major product by two electron transfer-protonation at higher negative potential. The polarograpic reduction waves shown to suppressed due to inhibitory effect of sodium lauryl sulfate micelle solution and split up on selectivity of anionic micelle effect in two step at the first reduction peak.

미셀-알콜수용액에서 Nitrobenzyl chloride의 전기화학적 환원

金日光,오해범 圓光大學校 基礎自然科學硏究所 1983 基礎科學硏究誌 Vol.2 No.1

The electrochemical reduction of nitrobenzyl chlorides in micelle-ethanol solution has been examined by polarography. The polarographic half-wave potential of nitrobenzy1 chlorides shown to be more negative shift in the anionic micelle(NaLS). o, p-nitrobenzy1 chlorides are initially an one-electron process which give the corresponding anion radical and the anion radical is rapidly decomposed to give the neutral radical. Those neutral radical dimerises as a major product although some o,p-nitrotoluene is also produced by hydrogen atom abstraction from the solvent. But m-nitrobenzy1 radical produced only m-nitrotoluene because of its steric effect.

3-Phenyl-4-nitrosydnone의 전기화학적 연구

金日光,金潤根 圓光大學校 基礎自然科學硏究所 1986 基礎科學硏究誌 Vol.5 No.2

An electrochemical reduction on the 3-phenyl-4-nitrosydnone in acetonitrile solution has been studied by direct current differential pulse polarography, cyclic voltammetry and controlled potential coulometry. Before the cleavage of phengl-N single bond a reversible electron transferchemical reaction (EC) mechanism of nitro functional group proceeded to form amino (orhydroxylamino) group by multielectron transfer which is followed to give phenyl glycine (or phenyl hydrazine) by single electron transfer-chemical reaction at the 2nd and 3rd irreversible reduction wave of high negative potential region. The cathodic half-wave potentials shown to be negative shift due to inhibition effect of cetyl-trimethyl ammonium bromide micelle while the sodium lauryl sulfate micelle showed reversible anodic peaks on the 2nd, 3rd reduction waves at high negative potential region.

인사말

김일광 한국분석과학회 2008 분석과학 Vol.21 No.1

물과 Micelle용액에서 Benzaldenhyde의 전기화학적 환원에 관한 연구

金日光,金潤根 圓光大學校大學院 1988 論文集 Vol.2 No.-

The electrochemical reduction of benzaldehyde in 10% ethanol-water solution contained surfactants has been studied by direct current (DC) differential pulse(DP) polarography, cyclic voltammetry (CV) and controlled potential coulometry(CPC). A totally irreversible electrode reaction processes of benzaldehyde reduction proceeded by one elecron transfer to form anion radical which undergoes both protonation and a second one electron reductio to give benzyl alcohol as a major product. The cathodic reduction wave was seperated by inhibition of sodium lauryl sulfate due to selectivity and effect of anionic charged micelle. The possible reduction mechanism with controlled pH range was suggested.

수은-EDTA착물을 이용한 일정 전류 전기량 적정법

김일광 광주보건대학 1978 論文集 Vol.4 No.-

A method for the constant current coulometric mercury-EDTA titrations has been examined. This method was useful for determination of radio chemical species by remote control. The principle is based upon the determination of various metal ions by the indirect electrical generation of ethylene diamine tetra acetic acid released upon reduction of mercury-EDTA chelate at platinum electrode. The effects of pH, buffer, chelon and metal ions on the potentiometric titration curve has been studied by means of potential-pH diagram. Potential-pH diagrams allow a prediction of the extent of the end point break and thus a choice for optimal titration conditions. The use of complex stability constant under controlled pH conditions made possible the potentiometric titration of multicomponent mixture.