• Journal of the Korean Magnetics Society
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• v.4 no.2
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• pp.160-167
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• 1994

In order to develop new magnetic media with higher coercivity, we have investigated the magnetic properties of Co-P/Cr and Co-P-Cr/Cr films. The coercivity of Co-P binary films deposited at RT was around 835 Oe in the range of 9-12 at.% P. In the Co-P binary system coercivity decreased with increasing substrate temperature for P contents of 9-12 at.%, which may be due to the decomposition of Co-P single phase to Co and $Co_{2}P$ phase. However, the coercivity of the films containing more than 12 at.% P is very low due to the formation of amorphous phase. The coercivity of Co-P-Cr ternary films increased with increasing Cr contents and reached the maximum value of 1020 Oe in the water $Co_{84}P_{10}Cr_{6}$ Film.

• Knowledge Management Research
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• v.15 no.2
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• pp.129-145
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• 2014

As a community of practice (CoP) is known to facilitate team learning, it is increasingly important to understand the mechanisms of CoP, thereby enabling organizations to fully utilize it and optimize its benefits. To explain how CoP improves organizational performance, we focus on its effects on social capital and knowledge management activities, and propose a research model suggesting that shared goals and trust in CoP improve its performance through knowledge integration. Our analysis uses structural equation modeling, with field data collected from 372 members of 46 CoPs in three companies; the analysis validates our research model. Our findings also suggest that CoP diversity can strengthen the link between knowledge integration and CoP performance.

• Journal of the Chungcheong Mathematical Society
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• v.30 no.1
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• pp.129-139
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• 2017

For a map $p:X{\rightarrow}A$, there are concepts of co-$H^p$-spaces, co-$T^p$-spaces, which are generalized ones of co-H-spaces [17,18]. For a principal cofibration $i_r:X{\rightarrow}C_r$ induced by $r:X^{\prime}{\rightarrow}X$ from $\imath:X^{\prime}{\rightarrow}cX^{\prime}$, we obtain some sufficient conditions to having extensions co-$H^{\bar{p}}$-structures and co-$T^{\bar{p}}$-structures on $C_r$ of co-$H^p$-spaces and co-$T^p$-structures on X respectively. We can also obtain some results about co-$H^p$-spaces and co-$T^p$-spaces in homology decompositions for spaces, which are generalizations of Golasinski and Klein's result about co-H-spaces.

• Ocean and Polar Research
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• v.38 no.4
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• pp.303-314
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• 2016

We tested the combined effects of increased partial pressure of $CO_2$ ($pCO_2$) and temperature on the reproduction and survival of the copepod Calanus sinicus from Asan Bay, the Yellow Sea under laboratory conditions to understand the impact of acidification on copepods. Egg production rate, survival rate, and fecal pellet production of C. sinicus were not affected by 1305 ppm $pCO_2$ or with combined treatments of temperature and $pCO_2$, including $8^{\circ}C$ and 289 ppm $pCO_2$ (ambient), $8^{\circ}C$ and 753 ppm $pCO_2$ (high $pCO_2$), $12^{\circ}C$ and 289 ppm $pCO_2$ (high temperature), and $12^{\circ}C$ and 753 ppm $pCO_2$ (greenhouse), for 5 or 10 d of exposure. However, egg hatching success of C. sinicus decreased significantly in the greenhouse treatment compared with the ambient or the high $pCO_2$ treatments. These results suggest that a combined treatment ($pCO_2$ and temperature) affected egg viability more than a single treatment($pCO_2$).

• Macromolecular Research
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• v.11 no.6
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• pp.425-430
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• 2003

Two types of poly(n-butyl acrylate) copolymer/silicate nanocomposites have been produced: poly(n-butyl acrylate-co-methyl methacrylate) [P(BA-co-MMA)]/silicate nanocomposites and poly(n-butyl acrylate-co-styrene) [P(BA-co-ST)]/silicate nanocomposites. The P(BA-co-MMA)/silicate nanocomposites shows the exfoliated structures but a P(BA-co-ST)/silicate nanocomposites have intercalated structures, because the BA/MMA comonomer has a higher polarity (e-value in Q-e scheme) than the BA/ST comonomer. The BA/MMA comonomer expanded the interlayer space of the silicate wider than did the BA/ST comonomer. The thermal degradation onset point of the P(BA-co-MMA)/silicate nanocomposites was 43$^{\circ}C$ higher than that of pure P(BA-co-MMA). P(BA-co-MMA)T5%, P(BA-co-MMA)T10%, and P(BA-co-MMA)T20% exhibit 134,302, and 195% increases, respectively, in their storage moduli at -20$^{\circ}C$ relative to the pure copolymer.

• The Journal of the Korea Contents Association
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• v.15 no.3
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• pp.438-447
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• 2015

When communities of practice(CoP) was mostly informal, has been formulated. Because Knowledge management(KM) was emphasized in the business sector. So it increase interest in the COP. Since the early 2000s, the research interest has thus far grown. At a point in time has the subject, CoP, been researched for ten years, it is significant to review the literatures, the main topics as well as critical factors on the subject. In this study, the trends in the relevant researches and the performance factors from the previous studies are examined. The references for this study are limited to the authorized scholarly and scientific journals. The results therethrough processed show that total 37 researches were conducted between the year 2000 and 2012. These could be classified by the research methods as 16 case studies, 11 studies using CoP as the dependent variable, 4 studies using CoP as an independent variable and 3 theoretical discourses. 7 out of 16 case studies suggest the 14 success factors of CoP; the most influential performance factor is the external community support. 11 studies examined factors influencing the performance of CoP; 13 performance factors were proposed in these studies. The most significant factor influencing the performance of CoP is the team effectiveness.

• Transactions of the Korean hydrogen and new energy society
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• v.16 no.4
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• pp.379-385
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• 2005

Effects of Co and Co-P catalysts on the hydrolysis of alkaline $NaBH_4$ solution were investigated. Co and Co-P catalysts were prepared on Cu substrate by electroplating. Hydrogen generation rate of Co-P catalyst was much faster than that of Co catalyst, demonstrating that Co-P had higher intrinsic catalytic activity for the hydrolysis of $NaBH_4$ than Co. Hydrogen generation properties of Co-P catalysts largely depended on cathodic current density and electroplating time because they influenced on the P concentration of the Co-P catalysts. Maximum hydrogen generation rate of Co-P catalyst was 1066 ml/min.g-catalyst in 1 wt.% NaOH + 10 wt.% $NaBH_4$ solution at $20^{\circ}C$, which was obtained at cathodic current density of $0.01\;A/cm^2$ for 130 s.

• 한국경영정보학회:학술대회논문집
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• 2008.06a
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• pp.270-275
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• 2008

The various research on Communities of practices (CoP) for propagation of softer type knowledge in new Knowledge Management (KM) strategy having been performed for past couple of years. CoP is one of effective process innovation tool for diffusion of knowledge. Based on CoP's voluntary and spontaneous characteristic, it performs a function of delivering softer type knowledge of workers to the other colleagues of organization. But one step further to CoP's function of propagation of internal knowledge, research on function of CoP's contribution in enterprise strategy are insufficient yet. This paper presents enterprise CoP should be managed and aligned to strategic objectives of enterprise, and also, suggests the methodology for CoPs to maintain a lifecycle as a tool to contribute in strategic goal attainment. Although CoPs are voluntary and spontaneous informal organization, it can display a contribution as tool for KM strategy when it is aligned to strategy properly and form efficient lifecycle.

• Journal of Biomedical Engineering Research
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• v.17 no.3
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• pp.291-296
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• 1996

Poly(ethylene glycol)(PEG) macromers terminated with diacrylate Iyoups and interpenetrating poly- mer networks(IPN) composed of poly(hydroxyethyl methacrylate)(PHEMA) or poly(hydroxyethyl methacrylate-co-hydronypropyl methacrylate-co- N-vinyl pyrrolidone ) [ P( HEM A-co- HPM A-co- NVP) ] and PEG macromer were synthesized with the aim of obtaining protein adsorption resistant soft contact lens. Polymerization of PEC macromer resulted in the formation of cross-linked gels due to the multifunctionality of macromer. Crosslinked P(HEMA) or P(HEMA-co-HPMA-co-WVP) chains were interpenetrated into the cross-linked three-dimensional networks of PEG. It was found that albumin adsorption onto the contact lens prepared by P(HEMA-co-HPMA-co-NVP) /PEG IPW decreases with an increase of molecular weight of PEG. Also, it was found that albumin adsorption onto the both contact lens decreases with an increase of concentration of PEC macromer in the IPN preparation. There are also more adequate in the bioinertnen for the contact lens by P(HEMA)/PEG IPN or P (HEMA-co-HPMA-co-NVP)/PEG IPN than that by P(HEMA) or P(HEMA-co-HPMA-co-NVP)

• Proceedings of the KAIS Fall Conference
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• 2009.05a
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• pp.314-318
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• 2009

CoP(Community of Practices)란 구성원간 새로운 정보 및 지식의 상호학습 및 문제해결방안을 모색하기 위해 활동하는 공동체를 지칭하는 것으로, 통상 학습공동체 또는 실천공동체 등으로 지칭된다. 연구개발조직은 통상 내부 구성원간의 상호학습은 물론 외부 전문가와의 정보교류 및 상호학습을 촉진하는 CoP 활성화를 토대로 구성원의 역량개발은 물론 해당 조직의 연구개발 성과를 향상시키려고 노력한다. 본 연구는 대전에 소재한 4개 국가연구개발조직의 151명 연구원을 대상으로 한 설문조사 결과를 바탕으로 응답자들이 참여한 CoP 운영특성과 해당 CoP 창출 성과와의 관계를 실증적으로 연구하고 있다. 실증연구 결과, 신규멤버 증대, 외부연계 도전적 풍토, 다양성지향 자율적 풍토와 같은 실질적인 CoP 운영특성이 CoP 성과에 긍정적 영향을 미치는 것으로 나타났다. 이에 비해 참가자수나 모임횟수와 같은 외형적 운영특성의 영향력은 유의성이 낮은 것으로 나타났다. 이 조사결과는 참여한 구성원의 역량개발은 물론 해당 조직의 성과 향상에 기여하는 CoP를 활성화 하기 위해 CoP의 수, 참가자 규모, 운영횟수와 같은 외형적 특성에만 치중하기보다, CoP의 운영내실화를 기하고, 창의적 조직풍토를 강화하는 노력이 보다 효과적일 수 있음을 시사한다.