기체크로마토그래피/질량분석기에 의한 수질시료 중 4-니트로톨루엔의 분석법 연구

이희경,권오승,류재천 한국환경독성학회 2000 환경독성보건학회지 Vol.15 No.1

Analytical method of 4-nitrotoluene (4-NT) in water was developed by gas chromatography/mass selective detector/selected ion monitoring (GUMMSIM). 4-NT was extracted with diethyl ether. Organic layer was washed with 5 % sodium chloride solution. The influence of solvent and evaporation condition on extraction of 4-NT were examined. The retention time of 4-NT peak was 7.72 min. Coefficient of variation (CV) of 4-NT (ng) within day and day-to-day was ranged from 7.0 to14.6% and from 7.7 to 20.8%, respectively. Recovery of 4-NT was ranged from 84 to 109%, and detection limit of 4-NT was less than 1 ng/ml.

남북한 주거문화의 차이점

이경희 中央大學校 民族發展硏究院 2002 民族發展硏究 Vol.- No.6

정신감성 59례에 대한 정신의학적 고찰

이충순,이인표,이주호,성경희 용인정신의학연구소 1994 용인정신의학보 Vol.1 No.1

도시 가구의 환경 친화적인 태도와 물 소비에 관한 연구

이경희 대한가정학회 2003 Human Ecology Research(HER) Vol.41 No.3

This study aimed to examine the water consumption of urban households according to pro-environmental attitude for environmental protection. In contrast to preview studies, this study purposed to include various related independent variables, education and strategies related to enviromnental protection.The data were from 665 housewives living in five urban areas. For the analysis of data, frequencies, means, percentages, GLM analysis, DMR test and Chi-square test were used. The main results of this study were as follows; 1. The respondents held high pro-environmental attitude that pro-environmental behaviors are important to protect environment. The pro-environmental attitude among the respondents were statistically different from the independent variables : spouse's occupation, living area, help of housekeeper, knowledge about environmental protection, convenience to check water consumption, and perception of voluntary conservative behavior among neighborhood. 2. There were great difference on water consumption among respondents. The significant independent variables to have effects on water consumption were different between water consumption per person and higher/lower average water consumption. The relationships of pr0-environmental attitude and motive to pro-environmental behavior with two water consumption as dependent variables were unique. Also, living areas and knowledge about environment protection were consistently important to explain the difference of water consumption.

Helicobacter pylori 편모 유전자의 클로닝 및 염기서열 분석

이광호,이우곤,조명제,도영미,백승철,강경희,박필성,이상룡 경상대학교 유전공학연구소 1993 遺傳工學硏究所報 Vol.12 No.-

A λgt11 expression libary of H. pylori DNA in E. coli Y1090 was screened with flagellin-specific rabbit antiserum for molecular cloning of the flagellin gene of H. pylori. A positive clone, λHPF4, was obtained and the recombinant antigen expressed from λHPF4 was a fusion protein with the molecular weight of 168kd. Sequence analysis of antigen-encoding DNA showed that an open reading frame composed of 1,536 nucleotides encodes a polypepride with a oredicted molecular size of 54kd. This open reading frame did not show the homology with flaA gene encoding 56kd protein of H. pylori and was confirmed as a unique sequence through homoligy searching. Therefore, the cloned antigen is supposed to be the carboxy-terminal region of the other flagellin protein of H. pylori, flaB, with the molecular weight of 58kd.

안전관리를 위한 전력선반송 FSK통신시스템

한경희,이영철 慶南大學校 附設 工業技術硏究所 1993 硏究論文集 Vol.11 No.-

본 논문에서는 전력선을 통신선로로서 이용한 전력선 통신(PLC)시스템의 임피던스, 잡음, 및 동작특성에 대하여 고찰하였으며 PLC시스템으로써 FSK통신 방식을 설계하여 데이터전송에 대한 실험을 수행 하였다. 그 결과 50m까지 신호전송이 가능함을 확인 하였으며, 이 방식을 집단주택 안전시스템에 적용 할 수 있음을 알았다. In this paper, we studied the impedance of power line and noise, operation characteristics of many electric p개ducts for PLC as a communication line. And FSK communication system of PLC media for the data transmission are designed and experimented. As a result, we conform that our transceiver system can communicate within 50m in local Area. And we conforms it can apply for security monitoring system of apartment.

인덕터 피킹에 의한 광대역 증폭기의 균일이득 특성분석에 관한 연구

강경일,한경희,이영철 慶南大學校 附設 工業技術硏究所 1993 硏究論文集 Vol.11 No.-

정보통신의 대용량 전송과 고속처리 능력의 요구에 따라, 균일이득을 갖는 광대역증폭기를 설계할 필요가 있다. 본 논문에서는 주파수대역(0.1~1㎓)에서 최대 균일이득을 갖는 광대역 증폭기를 설계 하고자, 쌍극자 트랜지스터의 고주파 등가회로에서 캐패시턴스의 영향을 감소시키고 주파수대역을 확장시키는 인덕터 피킹회로를 부가시켰으며, 컴퓨터 시뮬레이션에 의하여 인덕터 피킹효과를 분석하였다. 그 결과 귀환저항과 귀환인덕터를 갖는 증폭모듈이 최대균일 이득을 갖으며, 100-1000㎒에서 약 1.6㏈의 이득오차임을 알 수 있었다. According to the demands of the large capacity and high speed processing in communication system, it is very necessary to design the flat gain wide-band amplifier. In this papers, to design the wide-band amplifier with flat gain over the frequency band(0.1-1.0㎓), we analysis the effects of capacitance on BJT high-frequency equivalent circuit. We insert the inductor peaking element to the amplifier to decrease the effects of capacitance and to expand the frequency range. And we analyzed the various inductor peaking effects by computer simulation. As a result, feedback inductor with resistor shows the maximum flat gain and about 1.6dB gain variation at 0.1-1.0㎓.

부식산의 광촉매 산화 공정에 도입된 여러 종류이 상용 TiO₂비교연구

문경숙,김다희,이동석 江原大學校 産業技術硏究所 2001 産業技術硏究 Vol.21 No.B

In this study, the effects of crystalinity, composition and particle size of TiO2 catalysts on the degradations of humic acid in aqueous solution was assessed using the commercially avaliable TiO2 particles. Photocatalytic oxidations of humid acid (HA, Aldrich Co.) solution were carried out in case of adding different types of TiO2 catalysts and their decomposition efficiencies were analyzed with respect to pH, DOC and UV absorbances values for the HA solutions and compared one another. The experimental results showed that TiO2 particles(Degussa P-25) mixed with anataze and rutile gave the highest degradation efficiencies, respectively and much lower degradation efficiency in TiO2 paticles of rutile only type. In comparing among ST series of anataze types, it was observed that the degradation efficiencies generally were increased with increasing TiO2 contents and surface area of the particles. Higher degradation efficiency of HA was also found in zeolite type(D-TZ) of TiO2 paticles compared with hydroxyapatite type (D-TH) of TiO2 particles.

Buffer/CoFe/Cu/Co 샌드위치 박막의 자기저항 특성

김희중,김미양,오미영,이장로,송은영,김경민 숙명여자대학교 자연과학연구소 1996 자연과학논문집 Vol.- No.7

DC magnetron sputtering방법으로 Corning glass 기판위에 버퍼층을 Fe와 ??로 바꾸어가면서 보자력이 다른 ??와 Co를 이용하여 buffer/CoFe(35Å)/Cu(tÅ)/Cu(35Å)의 형태로 샌드위치 박막을 제작하고 자기저항비의 버퍼층 두께 및 비자성층 Cu층 두께, 자성층 두께 의존성을 조사하였다. 자기저항비와 포화 자기장(??)은 버퍼층의 두께가 두꺼워짐에 따라 증대하다가 극대치 3%를 보인 후 완만하게 감소하였다. NiFe, Fe버퍼층을 갖는 시료를 비교한 경우, 각각 CoFe층과 Co층 사이의 결합 자기장(??)은 큰 차이가 없었으나 NiFe버퍼층을 갖는 시료가 minor자기저항 곡선의 반가폭 ??는 감소하고 자기저항(MR) slope와 관련된 field senditivity(%/Oe)는 향상되었다. Buffer(tÅ)/CoFe(35Å)/Cu(50Å)/Co(35Å) sandwiches prepared by dc magnetron sputtering on a corning glass substrate using ?? and Co possess different coercivities. Dependence of magnetoresistance on the type and thickness of buffer layer, thickness of Cu and thickness of magnetic layer in buffer/CoFe/Cu/Co sandwiches were investigated. Magnetoresistance ratio and saturation field ?? increased as the thickness of buffer layer becomes thicker, then decreased smoothly after maximum value. Improved field sensitivity was realized by the use of ?? buffer layer.

소규모사업장 보건관리기술지원사업 지원여부에 따른 사업장내 의사소통 비교

정최경희,박혜숙,김정연,이경용,현성민,오지영,김수근,김현주,하은희 이화여자대학교 의과대학 2003 EMJ (Ewha medical journal) Vol.26 No.2

목적: 소규모사업장 보건관리기술지원사업 지원여부에 따라 사업장내 위험의사소통채널이 마련되었는지와 이 채널이 기능을 하는지, 그리고 의사소통채널마련과 사업장내 위험의사소통 활성화의 기본적이고 중요한 배경이 되는 사업주의 산업보건에 대한 관심이 차이가 있는지에 대해 살펴보고자 하였다. 방법: 서울, 안산, 대전, 광주, 포항 지역에서 보건관리기술지원사업을 받은 사업장과 받지 않은 사업장을 대상으로 비례층화무작위표본추출법을 사용하여 추출한 후 1991년 12월 6일부터 10일간 우편설문조사를 실시하였다. 설문대상은 각 사업장의 남녀 각 1명, 보건업무담당자, 사업주였으며, 설문내용은 사업장 및 응답자의 일반적 특성 및 사업장내 위험의사소통이었다. 설문에 응답이 온 463개 사업장의 자료를 자료처리하여 총 228개 사업장(단해년도지원 사업장 189개, 연속2년지원 사업장 13개, 비지원사업장 26개)을 대상으로 분석하였다. 결과: 사업장내 의사소통에 대한 단변량분석에서는 보건업무 담당자의 선정여부만이 통계적으로 유의한 차이가 있었다. 소규모사업장 보건관리기술지원사업을 지원받지 않은 사업장과 지원받은 사업장의 사업장내 위험의사소통을 비교하기 위한 로지스틱회귀분석 결과, 모든 항목에서 통계적으로는 유의한 차이를 보여주지 않았다. 그러나 사업주의 관심(OR ; 1.63, 95% CI ; 0.38~7.01)과 보건업무담당자의 선정(OR ; 3.67, 95% CI ; 1.00~13.44) 및 결정권한(OR ; 1.48, 95% CI ; 0.25~8.91), 사업주의 산업보건문제 소통(OR ; 3.07, 95% CI ; 0.81~11.71), 보건업무담당자의 정보요청경험(OR; 4.48, 95% CI ; 0.97~20.57)에서는 지원받지 않은 사업장에 비해 지원받은 사업장에서 교차비가 증가하는 양상을 보여주었다. 반면 노동자의 산업보건문제 소통가능성여부는 오히려 교차비가 0.53(95% CI ; 0.11~2.44)로 감소하는 경향을 보여주었다. 결론: 소규모사업장 보건관리기술지원사업을 의사소통의 측면에서 평가해보면, 사업주나 보건업무담당자에게는 다소 효과가 있었지만 노동자가 지속적으로 참여할 수 있도록 의사소통문화를 바꾸어내는 데에는 한계가 있었다. 개선을 위해서는 노동자 중심의 접근 프로그램의 개발 및 시행이 시급하다 할 수 있다. Objectives :This study was to evaluate the effectiveness of the government-funded subsidized occupational health program for small-scale enterprises(GSOHP_SSE) by occupational health com-munication in workplace. Methods : We sampled the 1,835 enterprises of study by proportional stratified random sampling among industries of supported and not supported by GSOHP_SSE in Seoul, Ansan, Daejeon, Kwang-joo and Pohang. Information on the general characteristics of enterprises and respondants and occupational health communication in the workplace was collected on self-reported questionnaires by post-survey between December 6 and 15 in 2001. We received answers from 463 enterprises and analyzed 228 enterprises through data-cleaning by logistic regression to evaluate effectiveness of GSOHP-SSE about occupational health communication in the workplace. Results : By multiple logistic regression analysis, GSOHP_SSE turned out not to be statistically significant factor in all dependent variables about occupational health communication in the work-place. The concern of owner(odds ratio (below OR) ; 1.63, 95% confidence interval(below 95% CI) ; 0.38-7.01), formation(OR ; 3.67, 95% CI ; 1.00-13.44) and empowerment(OR ; 1.48, 95% CI ; 0.25-8.91) of health manager, request about occupational health problem of health manager(OR ;4.48, 95% CI ; 0.97-20.57) and occupational health communication of owner (OR ; 3.07, 95% CI ; 0.81-11.71) had the trend increasing OR in the industries supported GS-OHP_SSE relative to the industries not supported. But in recognition of possibility on occupational health communication of laborers, OR of GSOHP_SSE was decreased in 0.53(95% CI ; 0.11-2.44). Conclusions: This study found that the GSOHP_SSE was some effective to the side of employer and health manager, but had a limitation about change of communication culture useful to the laborers. We suggested the laborer-centered health training programs or the empowerment-based health training programs for effective occupational health management in the workplace.