• Title/Summary/Keyword: Young Mee Chung

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Complexation of Cadmium(Ⅱ) with Humic Acids: Effects of pH and Humic Acid Origin

  • Lee, Mee-Hae;Choi, Se-Young;Chung, Kun-Ho;Moon, Hi-Chung
    • Bulletin of the Korean Chemical Society
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    • v.14 no.6
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    • pp.726-732
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    • 1993
  • A comparative study on cadmium(II) complexation with three well characterized humic acids (SHA: soil humic acid from the Okchun Metamorphic Belt; AqHA: aquatic humic acid from Gorleben underground aquifer, Germany; CoHA: commercially available humic acid from the Aldrich Co.) was carried out in 0.1 M $NaClO_4$ at different solution pH(5.0, 5.5, and 6.0) using the ultrafiltration technique. The maximum binding ability (MBA) of the humic acids for cadmium(II) was observed to vary with their origins and solution pH. The results suggest that 1 : 1 complex predominates within the experimental range, and the conditional stability constants were calculated based on the assumption of cooperative binding, yielding log K values that were quite similar (CoHA: 4.17${\pm}$0.08; AqHA: 4.14${\pm}$0.07; SHA: $4.06{\pm} 0.12\;l\;mol^{-1}$ at pH 6.0) irrespective of humic acid origins or pH. By contrast a nonlinear Schatchard plot was obtained, using the cadmium(II) ion selective electrode speciation analysis method, which indicated that humic acid may have two or more classes of binding sites, with $log\;K_1\;and\;log\;K_2$ of 4.73${\pm}$ 0.08 and $3.31{\pm}0.14\;l\;mol^{-1}$ respectively.

Design of a Korean Question-Answering System for News Item Retrieval (우리말 신문기사 검색을 위한 질문응답시스템 구현에 관한 연구)

  • Chung, Young-Mee
    • Journal of the Korean Society for information Management
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    • v.4 no.1
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    • pp.3-23
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    • 1987
  • This paper describes a question-answering system that can automatically analyze input texts and questions in Korean natural language. The particular texts used for the research were newspaper articles in the specific domain of sports news. The system consists of a set of Cobol programs and an associated set of data files containing lexicon, case grammar, linguistic rules. and data base. This system employs two retrieval functions of fact retrieval and passage retrieval. Therefore input questions can be answered in forms of either sentence or factual data.

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Children as Global Citizens (세계시민으로서 아동)

  • Lee, Yang-Hee;Koo, Mee-Hyang;Chung, Young-Sun
    • Korean Journal of Child Studies
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    • v.30 no.6
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    • pp.183-194
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    • 2009
  • This article examines the role of children in the modern era of globalization. The twentieth century sets the tone of viewing children as independent human beings, holding inherent and universal rights. Children are no longer viewed as immature beings in need of charity care, but rather ones with evolving capacities. Several important international movements are discussed : (1) The Convention on the Rights of the Child; (2) World Summit for Children; and (3) the United Nations General Assembly Special Session on Children. Trends in the current issues ranging over children as active citizens of the global world are provided, including poverty, violence, and climate change.

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A Study on Citation Analysis of SCIE Journals for Selecting Major Academic Journals in Interdisciplinary Fields (학제적 분야의 학술지 관리를 위한 SCIE 저널의 인용분석에 관한 연구)

  • Im, Douho;Chung, Young-Mee
    • Proceedings of the Korean Society for Information Management Conference
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    • 2010.08a
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    • pp.7-14
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    • 2010
  • 학제적 분야는 다양한 주제범주의 자료를 이용하는 특성이 존재하기 때문에 대학도서관이나 전문도서관에서는 학제적 분야에 대한 새로운 학술지 관리방안이 필요하다. 본 연구에서는 SCIE 논문을 발표한 국내 연구자들의 인용패턴을 바탕으로 저널 인용분석과 학제성 분석을 실시하여 학제적 분야의 학술지 관리 방안을 도출하였다. 본 연구를 통해 인용률 기반의 학제성 분석이 기존의 인용빈도를 바탕으로 한 방법과 함께 학제적 분야의 학술지를 관리하는 데 있어 유용함을 확인하였다.

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An Informetric Study on the Interdisciplinarity of Social Science (사회과학 분야의 학제성에 관한 계량정보학적 연구)

  • Min Ki-Eun;Chung Young-Mee
    • Proceedings of the Korean Society for Information Management Conference
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    • 2006.08a
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    • pp.121-126
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    • 2006
  • 이 연구에서는 인터넷 자원을 통해 사회과학 분야의 학제성을 측정하고 그 특징을 알아보기 위해 세 가지 계량정보학적 분석을 수행하였다. 먼저 세계적인 사회과학 정보 게이트웨이인 SOSIG의 Grapevine 자료를 통해 사회과학 내 학문분야 간 학제성을 측정하였고, 관련 학자들의 홈페이지 동시링크와 미국 상위 관련 학과 홈페이지의 동시링크를 분석하였다. 그 결과 business, education, philosophy 등을 중심으로 어느 정도 학제성이 나타났으나, 심리학 등 사회과학의 몇몇 분야의 학제성은 예상 외로 높지 않은 것으로 나타났다.

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A Case of Multiple Endobronchial Hamartomas (다발성 기관지내 과오종 1예)

  • Park, Sung-Kyu;Rhee, Kyoung-Joo;Park, Mee-Ja;Kim, Sun-Young
    • Tuberculosis and Respiratory Diseases
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    • v.39 no.1
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    • pp.83-88
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    • 1992
  • A hamartoma can be defined as a developmental malformation composed of tissue that normally constitute the organ in which the tumor occurs, but in which the tissue elements, although mature, are disorganized. Hamartoma is one of the most common benign lung tumors. Most of them are located in the lung parenchyme, but very rarely it can originate endobronchially. There is no case report of multiple endobronchial hamartomas in Korea. We report a case of multiple endobronchial hamartomas in a 63 year old woman with a review of the literatures.

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Immunomodulating Activities of Brazilin in vitro

  • Moon, Chang-Kiu;Mock, Myung-Soo;Yang, Kyung-Mee;Han, Hye-Seung;Won, Hyeon-Soon;Kim, Ji-Young;Chung, Jin-Ho;Moon, Chang-Hyun
    • Archives of Pharmacal Research
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    • v.15 no.4
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    • pp.283-288
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    • 1992
  • This work was performed to investigate the effects of brazilin in vitro on mitrogen-induced proliferation, ConA-induced TCGF release and responsiveness to recombinant-induced proliferation, ConA-induced TCGF release and responsiveness to recombinant IL-2 using splenocytes from C57BL/6 female mice. Brazilin (29-80 ng/ml) caused a noticeable increase in TCGF production of splenocytes, but did not affect responsivness to recombinant IL-2, the expression of ConA-induced high affinity IL-2 receptor and mitogen-induced proliferation of splenocytes.

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Antioxidant Activity of Roasted Defatted Perilla Seed

  • Jung, Mee-Jung;Chung, Hae-Young;Choi, Jae-Sue
    • Natural Product Sciences
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    • v.7 no.3
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    • pp.72-75
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    • 2001
  • The antioxidant activity of roasted defatted perilla (Perilla frutescens) seed was determined by measuring its radical scavenging effect on 1,1-diphenyl-2- picrylhydrazyl (DPPH) radicals, inhibitory activity on total reactive oxygen species generation in kidney homogenates using 2',7'-dichlorodihydro-fluorescein diacetate, and scavenging effect on authentic peroxynitrites. The methanolic extract of roasted defatted perilla seed showed strong scavenging activity in both DPPH and peroxynitrite radicals, and thus fractionated with several solvents. The antioxidant activity potential of the individual fraction was in the order of ethyl acetate>n-butanol>dichloromethane>water>n-hexane fraction. The ethyl acetate soluble fraction exhibiting strong antioxidant activity was further purified by repeated silica gel and Sephadex LH-20 column chromatography. Luteolin was isolated as one of the active principles from the ethyl acetate fraction, together with the inactive chrysoeriol and apigenin.

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A Study on the Effect of Data Fusion on the Retrieval Effectiveness of Web Documents (데이터 결합이 웹 문서 검색성능에 미치는 영향 연구)

  • Park, Ok-Hwa;Chung, Young-Mee
    • Journal of Information Management
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    • v.38 no.1
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    • pp.1-19
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    • 2007
  • This study investigates the effect of data fusion on the retrieval effectiveness by performing an experiment combining multiple representations of Web documents. The types of document representation combined in the study include content terms, links, anchor text, and URL. The experimental results showed that the data fusion technique combining document representation methods in Web environment did not bring any significant improvement in retrieval effectiveness.