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      • 비산회재로부터 합성된 제올라이트를 이용한 Polypropylene 촉매열분해에 관한 연구

        남윤미,이진홍,김성수,정수현 한국공업화학회 2003 응용화학 Vol.7 No.1

        Zeolites were synthesized from fly ash and used as catalysts for pyrolysis of polypropylene(PP) Zeolite synthesis was carried out by fusion methods employing three different NaOH/Fly ash rations in weight The catalytic performance of the fly ash-derived zeolite pyrolysis products. The properties of the fly ash-derived zeolites were characterized by XRD, SEM, BET, NH_3-TPD. It was found that the optimum NaOH/fly ash weight ratio was 1.2 in terms of the simulated boiling point distribution. The catalytic perfomance of the fly ash-derived zeolite was significantly improved by ion exchanging of zeolite from Na from(FAZ) to H from(HFAZ) The boiling point distributions of liquid pyrolysis products obtained over HFAZ were significantly lower than that obtained zeolite.

      • 동해로 유입되는 가곡천과 마읍천에 서식하는 담수어의 지리적 분포

        남명모,강영훈,채병수,양홍준 한국어류학회 2002 韓國魚類學會誌 Vol.14 No.4

        1999년 4월부터 2000년 10월까지 강원도 삼척시에 위치한 가곡천과 마읍천에서 어류의 지리적분포와 군집구조를 조사하였다. 가곡천에서는 10과 20종, 마읍천에서는 10과 25종의 어류가 확인되었으며, 이 가운데 한국 고유종은 Squalidus multimaculatus, Iksookimia koreensis 그리고 Liobagrus mediadiposalis의 3종이었다. 가곡천의 미기록종은 S. multimaculatus, I. koreensis, Pungitius sinensis sinensis 그리고 Oncorhynchus masou masou이었으며, Zacco platypus와 Z. temmincki가 우점종이었다. 가곡천 상류역에서는 Z. temmincki와 Moroco oxycephalus가 우점종이었으며, 중류역에서는 Z. platypus, 하류역에서는 Cottus Hngiongensis, Chaenogobius urotaenia 그리고 Rhinogobius brunneus가 우점종이었다. 마읍천의 미기록종은 Cyprinus carpio, Pseudorasbora parva, Silurus asotus, O. m. masou, M. oxycephalus, Gasterosteus aculeatus, P. s. sinensis, C. castaneus, Acanthogobius lactipes, Tridentiger brevispines이었으며, Z. platypus가 우점종이었다. 마읍천 상류역에서는 Z. platypus가 우점종이었으며, 중류역에서는 Ladislavia taczanowskii, 하류역에서는 P. s. sinensis가 우점종이었다. 본 조사에서 확인된 어류 가운데, 특히 가곡천에 서식하는 S. multimaculatus와 마곡천에 서식하는 L. taczanowskii와 Nemacheilus toni는 지리분포상 보호되어야하겠다. 가곡천의 종다양성지수는 1.109, 마읍천의 종다양성지수는 1.109로서 종다양성이 높고 군집이 안정되어 있었다. The geographical distribution and community structure of freshwater fishes in the Gagog and Maeup Streams, which flow into the East Sea, were surveyed from April 1999 to October 2000. Twenty species belonging to 10 families were collected in Gagog Stream. Twenty-five species belonging to 10 families were collected in Maeup Stream, including the Korean endemic species Squalidus multimaculatus, Iksookimia koreensis and Liobagrus mediadiposalis. In the Gagog Stream, S. multimaculatus, I. koreensis, Pungitius sinensis sinensis and Oncorhynchus masou masou were newly recorded. The dominant species were Zacco platypus and Z. temmincki. A tendency was seen in regional distribution such that Z. temmincki and Moroco oxycephalus dominated in the upper stream, Z. platypus in the middle stream, and Cottus hangiongensis, Chaenogobius urotaenia and Rhinogobius brunneus in the lower stream. Newly recorded from the Maeup Stream are Cyprinus carpio, Pseudorasbora parva, Silurus asotus, O.m.masou, M. oxycephalus, Gasterosteus aculeatus, P. s. sinensis, C. castaneus, Acanthogobius lactipes and Tridentiger brevispinis. The dominant species was Z. platypus. A tendency was seen in regional distribution such that Z. platypus dominated in the upper stream, Ladislavia taczanowskii in the midddle stream, and P. s. sinensis in the lower stream. Among the noteworthy fishes found in the present study were S. multimaculatus in the Gagog Stream and L. taczanowskii and Nemacheilus toni in the Maeup Stream, These species are considered as species of conservation concern. The species diversity index of the communities were 1.109 in the Gagog Stream and 1.166 in the Maeup Stream. The results indicate that the community structure in each stream is very diverse but stable in its species composition.

      • KCI등재

        수술실 손 소독제의 종류에 따른 균주 수의 변화

        홍성윤,김정민,김소영,이수정,오은실,양서인,김화실,김남초 병원간호사회 2006 임상간호연구 Vol.11 No.2

        Purpose: The present study purposed to compare the hand washing effect of 7.5% powidone-iodine, which is used in the operation room of C university hospital in Seoul, with that of Ethyl alcohol-CHG mixture recommended by the US Association of Operating Room Nurses (2002) and to adopt a more effective hand disinfectant. Method: In a quasi-experimental design, 48 medical staff who participated in operations during the period from November 2004 to February 2005 had hand washing using the two kinds of hand disinfectants: 7.5% povidone-iodine and the ethyl alcohol-CHG mixture. Their palms were swabbed and cultured just after hand washing and again after taking dff sterile gloves after the operation. The number of colonies from the two occasions were counted and compared. Result: The number of general bacillus increased significantly in the group using 7.5% povidone-iodine compared to that in the group using the ethyl alcohol-CHG mixture. The number of general bacillus increased signficantly in doctors compared to that in nurses. The factors affecting the increase of the number of general bacillus were disinfectants and medical personnel. The number of general bacillus was expected to increase 9.41 times with 7.5% povidone-iodine than with the ethyl alcohol-CHG mixture and 14.87 times in doctors than in nurses. Conclusion: This study shows that the ethyl alcogol-CHG mixture has a stronger hand disinfection effect than 7.5% povidone iodine. Thus we need to change the hand disinfectant used in operating rooms as soon as possible in order to minimize the infection of wounds resulting from operations.

      • FTTH를 위한 협대역 스펙트럼 필터의 설계

        홍성수,조미남,김사웅,박수봉 東新大學校 2003 論文集 Vol.13 No.-

        In this paper, harmonic expansion method(HEM) for analyze optical components which are necessary before the fabrication of optical circuit component and as its applications, using narrow-band spectral filter are studied. Also a narrow-band spectral filter constructed with a W-index optical waveguide is proposed and analyzed. The proposed filter offers a spectral width on the order of one nanometer, considerably narrower than that provided by a filter made of two step-index optical waveguides having the same transmission wavelength. The narrow spectral width is achieved by exploiting a relatively large slope difference between the dispersion characteristics of the W-index and step-index waveguides constituting the filter. The transmission characteristic of the proposed filter with peak transmission at 1550nm is calculated and compared with that of a corresponding filter made of two step-index waveguide filters.

      • 해안 지역의 지하수 개발가능량

        박남식,홍성훈,서경수,김성윤,최뢰 東亞大學校 建設技術硏究所 2006 硏究論文集 Vol.30 No.1

        An equation is developed to estimate potential groundwater resources available for development. This equation is useful for planning generally conducted prior to detailed design. The equation is a function of major factors such as aquifer characteristics, saltwater intrusion length, coastalgroundwater discharge and location of proposed pumping wells. Therefore, the equation is quite comprehensive. The equations are derived using well-known analytical solutions. Thus, the basis is scientifically sound. Use of the equation is quite simple since it is an explicit function of variables. A logical method is proposed to assess a radius of influence of a pumping well considering aquifer characteristics and pumping rate. Applications to a hypothetical problem and comparison with results from a more rigorous numerical simulation model indicatethat results obtained from the proposed equation are conservative.

      • DNA Chip 용 마이크로 핀에 관한 연구

        신홍규,이영수,남권선,김병희 한국공작기계학회 2004 한국공작기계학회 추계학술대회논문집 Vol.2004 No.-

        The bio-micro pin has been usually used for the biochemistry analysis. The manufacturing capability of the micro-pin and the their array with the effective and low-cost way is very important and it gives great economical benefits to developers. The micro-pin is composed of the sample channel for holding the liquid with the fixed volume, the flat tip which determines the printing quality and the pin head for preventing the rotation of the pin in the holder. In this study, we have manufactured newly designed micro-pins by the wire-EDM process with special jigs, and analyzed liquid holding and printing characteristics with respect to the variation of the shape and the tip size of the micro-pin.

      • 상사성을 고려한 배수재 설치 연약점토 지반의 원심모델링

        유남재,홍영길,정길수,조한기 강원대학교 산업기술연구소 2007 産業技術硏究 Vol.27 No.A

        This paper is results of experimental research on the effect of application of similarity related to permeability of soil on the consolidation behavior as centrifuge modeling of consolidation is performed with the centrifuge model facility. In this research, the permeability of soil was controlled by changing the viscosity of porewater as the mixed water with glycerin was used during the centrifuge model experiments. The effect of drainage path on consolidation was investigated by installing the vertical drains. A serise of centrifuge model tests with conditions of single vertical and radial horizontal drainage were carried out. Kaolinite and Jumunjin standard sand were used as soft clay and surcharges respectively during tests. For testing condition of single vertical drainage considering similarity of permeability, it was found that consolidation with mixed porewater with glycerin was delayed in comparisons with test results with water only. For conditions of horizontal drainage with vertical drains, a low permeability by changing the viscosity of pore water resulted in delayed degree of consolidation at an initial stage of consolidation. But, it predicted not much differences in settlement as long as the consolidation time was sufficiently long enough to finish consolidation. Consequently, it was found that similarity in permeability should be considered to be critical for the case of centrifuge model experiments related to consolidation with long drainage path.

      • KCI등재

        어린이의 꿈, 공상 및 희망에 대한 경험적 연구(1) : 발달학적 관점에서 고찰 FROM DEVELOPMENTAL PERSPECTIVE

        김수정,신민섭,남 민,홍강의 대한소아청소년정신의학회 1997 소아청소년정신의학 Vol.8 No.1

        저자들은 서울 시내에 위치한 2개 초등학교 1,3,5학년 학생 273명과 그들의 부모를 대상으로 하여 어린이의 꿈, 공상, 장래 희망 및 평소 상태를 경험적으로 조사하여, 발달학적 관점에서 이들의 특성 변화를 알아보고, 이들간의 상호 연관성을 살펴보았다. 그리고 이를 선행 연구와 비교하여 다음과 같은 결과를 얻었다. 1)어린이의 인지 발달 및 사회화와 더불어 꿈은 발달한다. 즉, 꿈에 동물, 가족 성원, 아는 사람의 출현은 줄고 나 자신, 동성 친구, 모르는 사람의 출현이 증가하며, 보다 현실적이고 정교한 내용으로 발달하였는데 이는 선행 연구에서와 비슷한 결과로 보여진다. 2)공상, 장래 희망, 그리고 평소 상태 역시 어린이의 학년에 따라 변화를 보였다. 즉 공상의 빈도는 학년에 따라 증가하였으며, 공상 내용 및 장래 희망도 보다 자기 중심적이고 현실적인 내용으로 변화하였다. 평소 상태 역시 학년에 따라 변화하였는데, 시험이나 공부에 대한 중압감이 심한 우리 나라의 현 실정을 반영하는 소견을 보였다. 3)꿈, 공상, 장래 희망, 그리고 평소 상태는 상호 연관성을 보였다. 즉, 기분 상태에서는 꿈과 공상, 공상과 평소 상태 사이에 유의한 연관성이 있었다. 또한 행복한 기분 및 무서운 기분은 각각의 기분과 합치되는 꿈, 공상, 장래 희망의 내용과 정적 연관성을 보였다. 내용에 있어서는 같은 내용의 꿈과 공상은 상당 부분 정적 연관성을 보였다. 본 연구는 정상 어린이들의 꿈, 공상, 장래 희망의 특성 변화를 발달학적 측면에서 살펴보고자 한 국내 최초의 시도로서 의의를 가지고 있다. 본 연구 결과를 통해 저자들은 꿈과 공상은 현실-모방-놀이-공상-꿈의 연속선상에 있으며 서로 밀접한 연관성을 가지고 나타남을 입증할 수 있었다. 마지막으로 앞에서 언급한 바와 같이 근래의 꿈 연구자들은 꿈의 심리적 의의에 대하여 서로 상반된 견해를 보이고 있으나, 본 연구 결과에서 꿈이 학년에 따라 특성이 변화한 점, 의미있는 감정 체험에 대한 반응성을 보인 점, 그리고 공상이나 장래 희망과 같은 각성 시의 사고 및 평소 상태와 밀접한 연관성을 보인 점 등은 꿈의 심리적 의의를 지지하는 소견으로 볼 수 있겠다. We examined the developmental characteristics of dream, daydream, and hope of elementary school students in their lst, 3rd, and 5th grades, and studied the correlation between three variables. We summarized the results of this study as follows. 1) The contents of dream developed with the cognitive development socialization process. In detail, appearance of animals, family members and known persons gradually decreased, and appearance of self, same-sex peers, and strangers gradually increased. These results are comparable with the previous studies of dream. 2) Daydream, hope, and current state also developed with age. In detail, frequency of daydream increased, and the contents of daydream and hope hanged toward more self-centered and more realistic. The changes of current state are thought to reflect the specific situation of Korea. 3) There are some correlation among dream, daydream, and hope. Especially happy mood and fearful mood had positive correlation with the relevant contents of dream, daydream, and hope. Also the contents of dream showed positive correlation with the same contents of daydream. This study is the first trial which investigate the developmental characteristics of dream, daydream, and hope of normal children in Korea. We verified that dream and daydream are on the continuous line of 'reality-imitation-play-daydream-dream'. Finally, considering the facts that dream developed with age ; responded to meaningful emotional experiences ; and had the correlation with daydream, hope and current state, the results of this study support the psychological meaning of dream.

      • KCI등재

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