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국내 웹검색도구의 특성 및 탐색 기능 평가에 관한 연구
이란주,최경화 한국문헌정보학회 1997 한국문헌정보학회지 Vol.31 No.1
최근에 국내외의 웹문서들을 대상으로 한글의 특징적인 면을 고려해서 편리하게 이용할 수 있는 국내 검색도구들이 개발되고 있다. 본 연구의 목적은 이러한 국내 검색도구들의 종류를 살핀 뒤, 이들의 특성을 파악해 이용자 입장에서 정보요구에 적합한 검색도구를 선택하도록 돕는데 있다. 검색도구를 크게 목록서비스(코시크, DIR, ZIP, 넷퀘스트21, 심마니)와 검색엔진(심마니, 까치네, 정보탐정, 애니서치, 유니파인더, 웹글라이더, 미스다찾니)으로 나누고 이들의 현황, 검색옵션과 장단점 및 성격등을 비교·평가함으로써 정보요구에 따른 검색도구 선택에 대한 방법론을 제공한다. 또한 국내 검색도구의 문제점을 지적함으로써 보다 향상된 검색도구의 설계에 도움이 되고자 한다 The purpose of the article is to help users to select appropriate Korean WWW search tools and to retrieve Web documents for their information needs by using them effectively. It analyzes the characteristics, functions, and advantages and disadvantages of each search tool, while search tools are divided broadly by two categories - subject directory services (Kor-seek, DIR, ZIP, Netquest21, Simmany) and keyword search engines (Simmany, Kachine, Jungbotamjung, Anysearch, Unifinder, Webglider, Missdachanni). It provides the selection criteria of search tools for users who have information needs. In addition, the study also attempts to contribute to the improvements in designing Korean WWW search tools, as investigating their shortcomings
Dielectric Polymers for OTFT Application
Choi, Sung-Lan,Kim, Yeon-Ok,Kim, Hong-Doo The Korean Infomation Display Society 2010 Journal of information display Vol.11 No.3
A series of new dielectric polymers with phenyl, epoxy, and carboxylicacid functional groups was prepared via free-radical polymerization. The effect of such dielectric polymers with various functional groups on the performance of OTFT was investigated. The nonpolar groups of terpolymer made the surface of the dielectric layer more hydrophobic and improved the crystal growth of pentacene on the gate insulator, resulting in higher mobility. By controlling the functional group, the electric characteristics of OTFT performance was varied, with $0.00017-0.15\;cm^2/V{\cdot}s$ mobility.
Controlled release using mesoporous silica nanoparticles functionalized with 18-crown-6 derivative
Choi, Young Lan,Jaworski, Justyn,Seo, Moo Lyong,Lee, Soo Jin,Jung, Jong Hwa Royal Society of Chemistry 2011 Journal of materials chemistry Vol.21 No.22
<P>Mesoporous silica nanoparticles were functionalized with an 18-crown-6 group as a gate molecule and the releasing capacity as a drug delivery system was controlled by the exchange reaction of “host–guest complex” with alkaline metal ions.</P> <P>Graphic Abstract</P><P>Mesoporous silica nanoparticles were functionalized with an 18-crown-6 group as a gate molecule and the releasing capacity as a drug delivery system was controlled by “host–guest complex”. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c1jm11334h'> </P>
Choi, Lan,Kwak, Min Young,Kwak, Eun Hwa,Kim, Dong Hyun,Han, Eun Young,Roh, Taehyun,Bae, Jung Yun,Ahn, Il Young,Jung, Jea Yeon,Kwon, Mi Jung,Jang, Dong Eun,Lim, Seong Kwang,Kwack, Seung Jun,Han, Soon Y Taylor Francis 2010 Journal of toxicology and environmental health. Pa Vol.73 No.21
<P>Acute nephrotoxicities of melamine (MEL), cyanuric acid (CA), and a mixture of both melamine and cyanuric acid (MC) were comparatively investigated in male Sprague-Dawley rats at 5 doses each with 10-fold dose interval as follows: MEL at 0.0315, 0.315, 3.15, 31.5, and 315 mg/kg; CA at 0.025, 0.25, 2.5, 25, and 250 mg/kg, and MC: [1×: (0.0315 + 0.025), 10×: (0.315 + 0.25), 100×: (3.15 + 2.5), 1000×: (31.5 + 25), and (315 + 250) mg/kg]. No marked adverse effects in renal function were observed in animals treated with MEL alone or CA alone, but evidence related to nephrotoxicity was noted in rats administered MC. Renal calculi and increased kidney weights were found in rats 7 d after daily oral administration of MC. Blood urea nitrogen (BUN) and creatinine were significantly elevated in the high dose MC groups at 100× or 1000×. In addition, elevated numbers of white blood cells (WBC), neutrophils, and lymphocytes in vivo and increased levels of prostaglandin E(2) (PGE(2)) in vitro were found in the MC group. Based on these data, the NOAEL (no-observed-adverse-effect level) for nephrotoxicity for MC was estimated to be 3.15 mg/kg body weight (bw)/d (MEL) plus 2.5 mg/kg bw/d (CA). If a safety factor of 1000 or more were applied to NOAEL, tolerable daily intake (TDI) would be 0.00315 and 0.0025 mg/kg/d or less for MEL and CA, respectively, which is far below the TDI of 0.2 mg/kg/d set by World Health Organization (WHO). In addition, in vitro cytotoxicity assays showed that the ACHN human renal adenocarcinoma cell line was more sensitive to MEL, CA, and MC than the MDCK canine kidney epithelial cell line. The 24-h half maximal inhibitory concentration (IC(50)) values for MEL (4792, 2792 관g/ml) were less than those of CA (9890, 6725 관g/ml, respectively) in MDCK and ACHN cell lines, suggesting that MEL may be more cytotoxic than CA. Furthermore, the 24-h IC(50) value for MC was found to be 208 관g/ml in ACHN cells. Data suggest that NOAELs based upon acute nephrotoxic parameters for MC were low, which might require further reassessment of the current TDI.</P>
A CLASS OF EXPONENTIAL CONGRUENCES IN SEVERAL VARIABLES
Choi, Geum-Lan,Zaharescu, Alexandru Korean Mathematical Society 2004 대한수학회지 Vol.41 No.4
A problem raised by Selfridge and solved by Pomerance asks to find the pairs (a, b) of natural numbers for which $2^a\;-\;2^b$ divides $n^a\;-\;n^b$ for all integers n. Vajaitu and one of the authors have obtained a generalization which concerns elements ${\alpha}_1,\;{\cdots},\;{{\alpha}_{\kappa}}\;and\;{\beta}$ in the ring of integers A of a number field for which ${\Sigma{\kappa}{i=1}}{\alpha}_i{\beta}^{{\alpha}i}\;divides\;{\Sigma{\kappa}{i=1}}{\alpha}_i{z^{{\alpha}i}}\;for\;any\;z\;{\in}\;A$. Here we obtain a further generalization, proving the corresponding finiteness results in a multidimensional setting.
Mesoporous silica nanoparticles functionalized with a thymidine derivative for controlled release
Choi, Young Lan,Lee, Ji Ha,Jaworski, Justyn,Jung, Jong Hwa The Royal Society of Chemistry 2012 Journal of materials chemistry Vol.22 No.19
<P>A thymidine derivative was functionalized to mesoporous silica nanoparticles in order to serve as a pH sensitive gate upon capping with polyadenine. Controlled zero release of rhodamine B mock cargo from the system at neutral pH reveals its potential as a delivery system.</P> <P>Graphic Abstract</P><P>Exhibiting zero premature delivery of cargo at neutral pH, effective controlled release of rhodamine from mesoporous silica nanoparticles is reported by lowering the environmental pH to uncap poly-adenine gating moieties. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c2jm30995e'> </P>
최향란(CHOI Hyang-Lan) 이주사학회 2016 Homo Migrans Vol.14 No.-
본고는 프랑스에 거주하는 마그레브계 출신 이주 여성노동의 불평등상황을 전 세대를 아울러 점검해보았다. 사회적 통합보다는 2000년대 이후 기업 안에서 행해지는 직접적 불평등 실태와 장애를 집중적으로 조명해보았다. 주요 분석대상은 호텔과 연관된 청소하청업체, 식품유통업계와 일부 레스토랑 부문이다. 이 직종들은 이주 여성들이 대다수를 차지하며, 그들이 쉽게 접할 수 있는 직종이기 때문이다. 이 분야에서 행해지는 고용불안정과 젠더와 연결된 불평등 취업분석을 통해, 여성들이 사회문화적 적응을 하는 데는 개인적 또는 사회구조적 한계를 지니고 있고, 그 결과 빈곤의 여성화가 표출, 가속화될 수밖에 없음을 주목할 수 있다. This article examined inequality of maghreb female migrant workers in France through first generation to third one. It focused on the direct inequality conditions and obstacles occurred into the enterprises after 2000 years rather than social integration. The main analysis points are the cleaning subcontractor enterprises related with hotels, food distributors and a few restaurants fields. Because these areas are ones in which most of female migrant workers easily spread and participate. Through this job analysis related gender and employment instability conducted in these fields, we can take note it exists private and social-structural limit for women to socio-culturally adapt, and consequently that impoverishment of women turns up and accelerates.