• 한국문헌정보학회지
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• 제32권1호
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• pp.27-43
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• 1998

본고는 미국의 도서관전산화, 도서관간의 협력, 인터넷과 정보서비스, 도서관정보서비스기관의 현황과 동향에 관하여 기술한 것이다. 도서관전산화시스템은 클라언트/서버 환경하에서 웹기반 기술을 적용하여 통합된 시스템을 구축하고 있으며, 디지털도서관 구축사업이 활발하게 진행중이다. 도서관간의 협력은 콘소시아를 형성하고 있는데 국가수준에는 ARL/AAU와 지역단위에는 CIC가 있고 주단위의 정보네트워크는 GALILEO, LLN, OhioLink, TexShare, VIVA, ILLINET 등이 있다. 인터넷과 월드와이드웹이 도서관에 미치는 영향이 지대하여 각 도서관들은 인터넷정보자원을 활용한 부가가치정보서비스를 개발하고 있다. 마지막으로 의회도서관, 국립농업도서관, 국립의학도서관 교육정보센터, 국립기술정보서비스의 최근 정보활동을 소개한다.

• Bulletin of the Korean Chemical Society
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• 제34권8호
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• pp.2358-2366
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• 2013

Iron oxide (ferrihydrite, hematite, and magnetite) coated silica gels were prepared using a low-cost, easily-scalable and straightforward method as the adsorbent material for arsenic removal application. Adsorption of the anionic form of arsenic oxyacids, arsenite ($AsO^{2-}$) and arsenate ($AsO{_4}^{3-}$), onto hematite coated silica gel was fitted against non-linear 3-parameter-model Sips isotherm and 2-parameter-model Langmuir and Freundlich isotherm. Adsorption kinetics of arsenic could be well described by pseudo-second-order kinetic model and value of adsorption energy derived from non-linear Dubinin-Radushkevich isotherm suggests chemical adsorption. Although arsenic adsorption process was not affected by the presence of sulfate, chloride, and nitrate anions, as expected, bicarbonate and silicate gave moderate negative effects while the presence of phosphate anions significantly inhibited adsorption process of both arsenite and arsenate. When the actual efficiency to remove arsenic was tested against 1 L of artificial arsenic-contaminated groundwater (0.6 mg/L) in the presence competing anions, the reasonable amount (20 g) of hematite coated silica gel could reduce arsenic concentration to below the WHO permissible safety limit of drinking water of $10{\mu}g/L$ without adjusting pH and temperature, which would be highly advantageous for practical field application.

• 영어영문학
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• 제56권1호
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• pp.47-64
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• 2010

It is unfair that environmental pragmatism has been regarded as a mouthpiece for industrial expediency and business boosterism. John Dewey's radical pragmatism known as 'Instrumentalism' has provoked ecological fundamentalists' criticism more vehemently than any other pragmatic philosophies. However, most of the presumptive misunderstandings of such critics as Holmes Rolston, J. Baird Calliott, Erich Katz, C. A. Bowers and many others come from their limited or reduced reading of Deweyan pragmatism. The following three aspects of Deweyan pragmatism can work out in opening up a dialogical space with those eco-centrist thinkers mentioned above. First, the concept of Dewey's 'primary experience' can articulate the foundationalist view of nature, which is often found in aboriginal cultures. Second, as Andrew Light points out, ecological essentialism can share its metaphilosophical position with the pragmatist epistemology. While Anthony Weston pursues pluralism, admitting that the foundationalism might be one of the efficient approaches to nature, Eric Katz is also clearly attracted to the metaphilosophical element in Weston's argument that anyone who attempts to claim the 'inherent value' of non-human nature never possibly avoids a pitfall of anthropomorphism. Lastly, in a more comprehensive perspective, Dewey's pragmatism shows a philosophical complexity, what Larry A. Hickman calls 'post-postmodernism.' a dynamic interaction between modernism and postmodernism. Significantly enough, the environmental version of this complexity can procure a meeting ground between foundationalist ecology and the pragmatic view of nature.

• 한국과학교육학회지
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• 제40권3호
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• pp.237-251
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• 2020

인류가 직면한 지구온난화와 같은 기후 변화에 대한 이슈는 우리의 삶에 직접적인 영향을 미치는 매우 중요한 문제로 이를 극복하기 위해서는 탄소 순환에 대한 통합적 이해를 바탕으로 대기 중 이산화탄소 등의 온실기체 방출량 감축이 필수적이다. 이 연구의 목적은 탄소 순환 교육에 대한 국내외 연구동향을 분석하여, 미래 시민으로 성장할 학생들을 위한 탄소 순환 교육의 가치와 방향을 제시하는데 있다. 이를 위해 '탄소 순환 교육'과 관련하여 국내외 다양한 학술연구 데이터베이스 (RISS, KCI, Google 학술검색, ERIC 등)에서 수집된 52편의 연구들을 대상으로 분석하였다. 그 결과, 탄소 순환 교육을 위해 많은 연구들이 다양한 형태로 이루어져 왔으나, 개발된 프로그램의 낮은 활용 가능성과 검증의 필요성, 정밀하고 일괄적인 학생인식과 수준 조사 도구 개발의 필요성, 교수·학습 모형과 교사를 대상으로 한 관련 연구의 필요성, 교사의 탄소 순환 교육을 위한 자료의 필요성, 그리고 다양한 주제와 소재의 활용이 필요한 것으로 확인되었다. 지구온난화를 포함한 지구 환경 변화에 능동적으로 대처하기 위해서는 학생들의 탄소 순환에 대한 통합적인 이해가 중요하다. 이러한 학습 기회를 지원하기 위해 기존에 개발된 프로그램의 검증을 바탕으로 교육 현장에서 활용할 수 있도록 제공하고, 학생들의 탄소 순환에 대한 이해 수준을 높이고 오개념을 개선할 수 있도록 생활속에서 적용할 수 있는 실질적인 형태의 내용을 교육과정에 포함할 필요가 있다. 또한 교사의 전문성 향상을 위해 다양한 소재와 주제를 포함하는 탄소 순환 교육 사례에 대해 교사 연수를 통해 제공되어야 할 것이다.

• Journal of Microbiology and Biotechnology
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• 제16권9호
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• pp.1377-1383
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• 2006

Among 46 Acinetobacter baumannii isolates collected in 2004, two imipenem-resistant isolates were obtained from clinical specimens taken from patients hospitalized in Busan, Republic of Korea. Two carbapenemase-producing isolates were further investigated to determine the mechanism of resistance. These isolates were analyzed by antibiotic susceptibility testing, microbiological tests of carbapenemase activity, determination of pI, transconjugation test, enterobacterial repetitive consensus (ERIC)-PCR, and DNA sequencing. Two cases of infection by A. baumannii producing the IMP-1 ${\beta}$-lactamase were detected. The isolates were characterized by a modified cloverleaf synergy test and EDTA-disk synergy test. Isoelectric focusing of crude bacterial extracts revealed nitrocefin-positive bands with a pI value of 9.0. PCR amplification and characterization of the amplicons by direct sequencing indicated that the isolates carried a $bla_{IMP-l}$ determinant. The isolates were characterized by a multidrug resistance phenotype, including penicillins, extended-spectrum cephalosporins, carbapenems, and aminoglycosides. These results indicate that the observed imipenem resistance of two Korean A. baumannii isolates was due to the spread of an IMP-1-producing clone. Our microbiological test of carbapenemase activity is simple to screen class B metallo-${\beta}$-lactamase-producing clinical isolates to determine their clinical impact and to prevent further spread. This study shows that the $bla_{IMP-l}$ resistance determinant, which is emerging in Korea, may become an emerging therapeutic problem, since clinicians are advised not to use extended-spectrum cephalosporins, imipenem, and aminoglycosides. This observation emphasizes the importance of having effective control measures in Asian hospitals, such as early detection of colonized patients, isolation procedures, and a judicious use of antibiotics.

• Advances in environmental research
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• 제5권1호
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• pp.1-18
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• 2016

Magnetic nano-based sorbents have been synthesized for the recovery of two rare earth elements (REE: Nd(III) and Yb(III)). The magnetic nano-based particles are synthesized by a one-pot hydrothermal procedure involving co-precipitation under thermal conditions of Fe(III) and Fe(II) salts in the presence of chitosan. The composite magnetic/chitosan material is crosslinked with epichlorohydrin and modified by grafting alanine and serine amine-acids. These materials are tested for the binding of Nd(III) (light REE) and Yb(III) (heavy REE) through the study of pH effect, sorption isotherms, uptake kinetics, metal desorption and sorbent recycling. Sorption isotherms are well fitted by the Langmuir equation: the maximum sorption capacities range between 9 and 18 mg REE $g^{-1}$ (at pH 5). The sorption mechanism is endothermic (positive value of ${\Delta}H^{\circ}$) and contributes to increase the randomness of the system (positive value of ${\Delta}S^{\circ}$). The fast uptake kinetics can be described by the pseudo-second order rate equation: the equilibrium is reached within 4 hours of contact. The sub-micron size of sorbent particles strongly reduces the contribution of resistance to intraparticle diffusion in the control of uptake kinetics. Metal desorption using acidified thiourea solutions allows maintaining sorption efficiency for at least four successive cycles with limited loss in sorption capacity.

• Journal of Microbiology and Biotechnology
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• 제20권1호
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• pp.169-178
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• 2010

The microbial community structure in Thailand soils contaminated with low and high levels of arsenic was determined by denaturing gradient gel electrophoresis. Band pattern analysis indicated that the bacterial community was not significantly different in the two soils. Phylogenetic analysis obtained by excising and sequencing six bands indicated that the soils were dominated by Arthrobacter koreensis and $\beta$-Proteobacteria. Two hundred and sixty-two bacterial isolates were obtained from arsenic-contaminated soils. The majority of the As-resistant isolates were Gramnegative bacteria. MIC studies indicated that all of the tested bacteria had greater resistance to arsenate than arsenite. Some strains were capable of growing in medium containing up to 1,500 mg/l arsenite and arsenate. Correlations analysis of resistance patterns of arsenite resistance indicated that the isolated bacteria could be categorized into 13 groups, with a maximum similarity value of 100%. All strains were also evaluated for resistance to eight antibiotics. The antibiotic resistance patterns divided the strains into 100 unique groups, indicating that the strains were very diverse. Isolates from each antibiotic resistance group were characterized in more detail by using the repetitive extragenic palindromic-PCR (rep-PCR) DNA fingerprinting technique with ERIC primers. The PCR products were analyzed by agarose gel electrophoresis. The genetic relatedness of 100 bacterial fingerprints, determined by using the Pearson product-moment similarity coefficient, showed that the isolates could be divided into four clusters, with similarity values ranging from 5-99%. Although many isolates were genetically diverse, others were clonal in nature. Additionally, the arsenic-resistant isolates were examined for the presence of arsenic resistance (ars) genes by using PCR, and 30% of the isolates were found to carry an arsenate reductase encoded by the arsC gene.

• 지구물리와물리탐사
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• 제7권1호
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• pp.93-98
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• 2004

The sand-covered Muweilah archaeological site in the United Arab Emirates (UAE) is a unique Iron Age site, and has been subject to intensive investigations. However, excavations are time consuming and may require twenty years to complete. Thus geophysical surveys were undertaken with the objective of characterising the site more expeditiously. This paper presents preliminary results of these surveys. Ground penetrating radar (GPR) was tested as a primary imaging tool, with an ancillary shallow time domain EM (MetalMapper) system. Dense 3D GPR datasets were migrated to produce horizontal (plan view) depth slices at 10 cm intervals, which is conceptually similar to the archaeologists' excavation methodology. The objective was to map all features associated with anthropogenic activity. This required delineating extensive linear and planar features, which could represent infrastructure. The correlation between these and isolated point reflectors, which could indicate anthropogenic activity, was then assessed. Finally, MetalMapper images were used to discriminate between metallic and non-metallic scatterers. The moderately resistive sand cover allowed GPR depth penetration of up to 5 m with a 500 MHz system. GPR successfully mapped floor levels, walls, and isolated anthropogenic activity, but crumbling walls were difficult to track in some cases. From this study, two possible courtyard areas were recognised. The MetalMapper was less successful because of its limited depth penetration of 50 cm. Despite this, the system was still useful in detecting modem-day ferruginous waste and bronze artefacts. The results (subject to ongoing ground-truthing) indicated that GPR was optimal for sites like Muweilah, which are buried under a few metres of sand. The 3D survey methodology proved essential to achieve line-to-line correlation for tracking walls. In performing the surveys, a significant improvement in data quality ensued when survey areas were flattened and de-vegetated. Although MetalMapper surveys were not as useful, they certainly indicated the value of including other geophysical data to constrain interpretation of complex GPR features.

• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2016년도 춘계학술대회
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• pp.277-280
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• 2016

실시간 원격 감지 시스템은 많은 감시 상황에서 중요한 가치를 지니고 있다. 실시간 원격 감지 시스템은 누군가가 그의 장소에서 무슨 일이 일어나고 있는지를 알 수 있게 한다. Kinect의 V2는 컴퓨터에게 눈의 역할을 제공하며 컬러와 깊이 이미지, 오디오 입력과 골격 데이터 등 다양한 데이터를 생성 할 수 있는 새로운 유형의 카메라이다. 본 논문에서는 깊이 이미지와 함께 Kinect V2의 센서를 사용하여, Kinect에 의해 덮인 공간에서의 모니터링 시스템을 제공한다. 따라서 Kinect 카메라에 의해 덮인 공간에 기초하여, 최소 및 최대 거리를 설정함으로써, 깊이의 범위를 이용하여 감시하는 대상 지역을 정의한다. 대상 공간에서 추적 개체가 있는 경우, 컴퓨터 비전 라이브러리(Emgu CV)에서 Kinect 카메라는 이미지 전체의 색상을 캡처하고, 이를 데이터베이스로 전송함으로써 인터넷이 있으면 어디서나 사용자가 자신의 모바일 장치를 통해 접속할 수 있다.

• 펄프종이기술
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• 제46권5호
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• pp.19-26
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• 2014

In-situ $CaCO_3$ formation on recycled wood pulp was studied to improve optical property and filler attachment to the fiber furnish in papermaking. We tried to attach calcium oxide (CaO) to the recycled fibers, old newspaper (ONP) in this case, by using selected polymers before in-situ $CaCO_3$ formation reaction on fibers, and then, $CO_2$ was injected to the furnish until all the CaO on fiber surfaces was consumed. It was found that the attachment of newly formed $CaCO_3$ to recycled fibers became stronger by attaching CaO to the fibers before in-situ $CaCO_3$ formation reaction. It was expected that the polymers used for the attachment of calcium source to the fiber furnishes helped to keep the newly formed $CaCO_3$ strongly attached to the fiber surface as well as to retain the impurities associated with calcium source and recycled fibers, if any. In-situ $CaCO_3$ formation gave higher brightness and much less ERIC value in ONP sheet than the case when the equivalent amount of GCC was added to the furnish.