• 한국지반공학회지:지반
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• 제9권1호
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• pp.31-44
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• 1993

말뚝이 설치되는 동안과 하중이 재하되는 동안에 유발되는 관내토의 거동과 관내토가 개단 말뚝의 지지력에 미치는 영향, 그리고 관내토의 하중전이 메카니즘 등을 알아보기 위하여, 개단말뚝의 단면부에 작용하는 지지력과 관내토에 의한 지지력 및 외주면마찰력을 분리하여 측정할 수 있도록 제작된 모형 개단강관말뚝과 압력조절이 가능한 토조를 이용하여 모래지반을 대상으로한 모형말뚝실험을 실시하였다. 실험결과로부터, 개단말뚝의 폐색정도는 폐색길이비(PLR)보다는 특정회수율(${\gamma}$)에 의하여 더 정화히 성의될 수 리음을 알 수 있으며, 내주면마찰력의 대부분은 말뚝 선단부로부터 말뚝내경의 3배까지의 영역에 존재하는 관내토에 의하여 발생되는 것으로 나타났다. 또한 전체 지지력에서 내주면마찰력이 차지하는 비율은 외주면마찰력이 차지하는 비율보다 상당히 크기 때문에, 개단말쪽의 지지력 산정시 내주면마찰력은 필수적으로 고려되어야 한다.

• 한국재료학회지
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• 제28권10호
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• pp.583-589
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• 2018

This study investigates the effect of fatigue stress on the damping capacity in a damaged Fe-22Mn-12Cr-3Ni-2Si-4Co damping alloy under fatigue stress. ${\alpha}^{\prime}$ and ${\varepsilon}-martensite$ forms by fatigue stress in the damaged Fe-22Mn-12Cr-3Ni-2Si4-Co damping alloy under fatigue stress. The ${\alpha}^{\prime}$ and ${\varepsilon}-martensite$ forms with the specific direction and surface relief, or they cross each other. With an increasing fatigue stress, the volume fraction of ${\alpha}^{\prime}-martensite$ and ${\varepsilon}-martensite$ increases. With an increasing fatigue stress, the damping capacity increases with an increase in the volume fraction of ${\varepsilon}-martensite$. The increase in the damping capacity in the damaged Fe-22Mn-12Cr-3Ni-2Si-4Co alloy under fatigue stress strongly affects the increase of ${\varepsilon}-martensite$ formed by fatigue stress, but the damping capacity of the damaged Fe-22Mn-12Cr-3Ni-2Si-4Co damping alloy under fatigue stress is strongly controlled by a large amount of ${\alpha}^{\prime}-martensite$.

• 한국환경과학회지
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• 제10권5호
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• pp.315-321
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• 2001

This study was conducted to estimate the decomposition capacity for organic matter by microbe of tidal flat sediments (Hajae, Dongjin and Mankyung). The decomposition rate constants (K') have been determined by Thomas slope method and compared with the values of each tidal flats. The decomposition rates of organic matter by microbe were initially very slow, but at the end of 12 hours, very sharply increased. The values of decomposition rate constant for Dongjin, Mankyung and Hajae tidal flat sediment were 1.364$day^{-1}$/, 1.080d$day^{-1}$ and 0.735$day^{-1}$, respectively. The decomposition rate constant of Dongjin tidal flat sediment which affected by livestock wastewater was higher than others. The decomposition quantity (mg/g/day) of organic matter by microbe of tidal flat sediments was 0.4mg/g/day for Dongjin, 0.36mg/g/day for Mankyung and 0.36mg/g/day for Hajae. The average of decomposition quantity was 0.37mg/g/day. To calculate purification capacity (kg/ha) of organic matter by microbe, we applied to two assumption ; 1) biological action by microbe is occur within 0.1cm under surface 2) specific gravity of sediment are 2.5g/$\textrm{cm}^2$. The purification capacity of organic matter by microbe of tidal flat sediment was calculated to 9.25kg/ha. The relationships between decomposition rate constant (K') and ignition loss (I. L), chemical oxygen demand by sediment (CO $D_{sed}$), total carbon(TC), silt and clay as index of organic matter were a high positive($R^2$=0.97~1.00).

• 대한지역사회영양학회지
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• 제19권1호
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• pp.71-83
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• 2014

The purpose of the study was to implement and evaluate a nutrition capacity training program for dietitians and other professionals working at customized home visiting health services (CHVHS). This program focused on nutrition services for hypertension or diabetes mellitus patients including topics regarding CHVHS, and composed of 10 sessions with lectures, discussion and practice. Dietitians (n = 54) and other professionals (n = 20) participated in the program and completed the questionnaire to assess their understanding of nutritional management, nutrition services and CHVHS before and after the program, and to examine program satisfaction and education needs. Subjects were mostly women (98.6%) and college or university graduates (93.2%). Total score (p < 0.001), as well as all items (p < 0.001 or p < 0.01) of understanding regarding nutritional management, nutrition services and CHVHS, were significantly increased after the program both in dietitians and in other professionals. Subjects were generally satisfied with the program, showing more satisfaction with items regarding subject's participation, acquiring new knowledge, usefulness of the program for CHVHS, and education materials. In future nutrition capacity training programs, subjects wanted to have classes regarding nutrition services for specific chronic diseases, development of education materials, methods for dietary life education, modifying eating habits and so on. Other professionals compared to dietitians, showed higher education needs in meal management (p < 0.01) and nutrition counseling skills (p < 0.05). This study showed the effectiveness of a nutrition capacity training program for home-visiting dietitians and other professionals, and suggests the need and direction for future nutrition capacity training programs.

• 전기화학회지
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• 제5권4호
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• pp.173-177
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• 2002

Electrochemical characteristics of a graphite/lithium and a $LiCoO_2/lithium$ half cell and a $graphite/LiCoO_2$ full cell were analyzed using a GCSOC (gradual control test of the state of charge) technique. The IIE (initial intercalation coulombic efficiency), which represents lithium intercalation property of the electrode material, and the $lIC_s$ (initial irreversible capacity by the surface), which represents irreversible reaction between the electrode surface and the electrolyte were obtained from the GCSOC analysis. Linear-fittable capacity ranges of IIE of graphite and $LiCoO_2$ electrodes were 370 and 150 mAh/g, respectively, based on material weight. The value of lIE for graphite and $LiCoO_2$ electrodes were $93-94\%$ and $94-95\%$, respectively. The value of IICs for graphite and $LiCoO_2$ electrodes were 15-17 mAh/g and 0.3-1.7 mAh/g, respectively. The value of IIE for $graphite/LiCoO_2$ full cell, used GX25 and DJG311 as a graphite, was $89-90\%$ that lower than that for the half cells. Parameters of IIE and IICs can also be used to represent not only half cell but also full cell.

• 한국진공학회:학술대회논문집
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• 한국진공학회 2013년도 제45회 하계 정기학술대회 초록집
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• pp.288-288
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• 2013

Lithium-ion battery (LIB) is one of the most important rechargeable battery and portable energy storage for the electric digital devices. In particular, study about the higher energy capacity and longer cycle life is intensively studied because of applications in mobile electronics and electric vehicles. Generally, the LIB's capacity can be improved by replacing anode materials with high capacitance. The graphite, common anode materials, has a good cyclability but shows limitations of capacity (~374 mAh/g). On the contrary, silicon (Si) and germanium(Ge), which is same group elements, are promising candidate for high-performance LIB electrodes because it has a higher theoretical specific capacity. (Si:4200 mAh/g, Ge:1600 mAh/g) However, it is well known that Si volume change by 400% upon full lithiation (lithium insertion into Si), which result in a mechanical pulverization and poor capacity retention during cycling. Therefore, variety of nanostructure group IV elements, including nanoparticles, nanowires, and hollow nanospheres, can be promising solution about the critical issues associated with the large volume change. However, the fundamental research about correlation between the composition and structure for LIB anode is not studied yet. Herein, we successfully synthesized various structure of nanowire such as Si-Ge, Ge-Carbon and Si-graphene core-shell types and analyzed the properties of LIB. Nanowires (NWs) were grown on stainless steel substrates using Au catalyst via VLS (Vapor Liquid Solid) mechanism. And, core-shell NWs were grown by VS (Vapor-Solid) process on the surface of NWs. In order to characterize it, we used FE-SEM, HR-TEM, and Raman spectroscopy. We measured battery property of various nanostructures for checking the capacity and cyclability by cell-tester.

• 한국경제지리학회지
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• 제25권1호
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• pp.61-86
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• 2022

본 연구는 대구 자동차부품산업을 사례로, 흡수역량의 관점에서 특정 경제공간에 모여 있는 기업들의 기술이전 프로세스를 분석하였다. 분석 결과에 따르면, 기업의 흡수역량은 기술이전의 공급 주체, 경로, 방법, 제도적 상호작용과 긍정적 연관성이 있는 것으로 나타났다. 낮은 흡수역량은 기업들의 기술 탐색 능력을 떨어트려 기술이전을 제약하는 반면, 높은 흡수역량은 공식·비공식 경로를 통한 기술 탐색과 다양한 기술이전 기회로의 접근 가능성을 부여한다. 이러한 결과는 지역 기술이전의 활성화를 위해서는 단기적으로 지역 매개기관의 선제적인 찾아가는 서비스를 통해 기업들의 탐색 능력을 보완하는 한편, 장기적으로는 지역 기업들의 흡수역량 증진에 초점을 둔 정책 접근이 필요함을 시사한다. 이러한 정책의 효과적 추진을 위해서는, 제도 주체간 연계를 촉진하는 인터페이스 구조의 확립에 있어서 기업의 흡수역량 수준별로 대응되는 다층적 거버넌스의 접근이 요구된다.

• 한국표면공학회지
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• 제56권1호
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• pp.104-114
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• 2023

Three dimensional (3D) porous structures consisting of Cu@CoO core-shell-type nano-dendrites were synthesized and tested as the anode materials in lithium secondary batteries. For this purpose, first, the 3D porous films comprising Cu@Co core-shell-type nano-dendrites with various thicknesses were fabricated through the electrochemical co-deposition of Cu and Co. Then the Co shells were selectively anodized to form Co hydroxides, which was finally dehydrated to get Cu@CoO nanodendrites. The resulting electrodes exhibited very high reversible specific capacity almost 1.4~2.4 times the theoretical capacity of commercial graphite, and excellent capacity retention (~90%@50^th cycle) as compared with those of the existing transition metal oxides. From the analysis of the cumulative irreversible capacity and morphology change during charge/discharge cycling, it proved that the excellent capacity retention was attributed to the unique structural feature of our core-shell structure where only the thin CoO shell participates in the lithium storage. In addition, our electrodes showed a superb rate performance (70.5%@10.8 C-rate), most likely due to the open porous structure of 3D films, large surface area thanks to the dendritic structure, and fast electron transport through Cu core network.

• 사회복지연구
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• 제41권3호
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• pp.241-269
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• 2010

본 연구는 그동안의 국내의 성년후견제도 도입에 관한 논의에서 간과되었던 의사결정능력과 관련한 주요 쟁점과 의사결정능력의 개념적 구성요소 및 평가와 판정절차에 관한 쟁점을 검토하였다. 이에 근거하여 모범적인 성년후견법률의 하나로 인정받는 영국의 정신능력법(Mental Capacity Act, 2005)이 의사결정능력의 개념과 평가절차를 어떻게 규정하고 있는지 분석하였다. 정신능력법은 의사결정능력을 의사결정대상과 환경, 시간적 맥락에 의존적인 개념으로 규정하고 있었다. 정신능력법의 의사결정능력 평가 및 판정절차는 본인의 의사결정능력을 최대한 규명하기 위한 환경적 지원의 제공, 의사결정능력의 변화가능성에 대한 고려, 의사결정의 중요성에 따른 의사결정능력 평가의 위계적 접근 등이 특징적이다. 이러한 연구결과를 토대로 우리나라 성년후견법률 도입과 관련한 함의를 제시하였다.

• 대한수의학회지
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• 제27권2호
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• pp.259-267
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• 1987

Enterotoxigenic E. coli (ETEC) cause an acute diarrhea (white scour) in both animals and humans. The disease process initially involves the adherence and colonization of the mucosal surface of the small intestine, followed by the elaboration of a heat-labile enterotoxin (LT) and/or heat-stable enterotoxin (ST). Intestinal adherence or colonization by ETEC is generally mediated by a specific surface-associated pilus (fimbrial) antigen that endows the bacteria with the capacity to adhere to epitherial cell surface. Fourteen monoclonal antibodies (MAbs) directed against pili antigens of ETEC were obtained by cell fusion/hybridoma technique. They were characterized by indirect immunofluorescence assay (IFA), and divided into four groups: specific to K99 antigen (group 1), cross-reactive with K99 and F41 antigens (group 2), specific to K88 antigen (group 3) and specific to 987P and K88 antigens (group 4), respectively. These MAbs demonstrated the distinct pili (K) antigens on the surface of ETEC by IFA, and could be utilized as diagnostic reagent for the identification of ETEC. When eighty-seven field isolates of E. coli from piglet with diarrhea were tested by group 3 MAb, fourty-two strains (48.3%) has K88 pilus antigen suggesting that this is one of the major pilus antigen of ETEC present in fifeld.