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        • 사체 신장이식의 임상분석

          유기원,허경열,문철 순천향의학연구소 2001 Journal of Soonchunhyang Medical Science Vol.7 No.1

          Background : Because of the shortage of living-related donor and social acceptance of brain death, cadaveric renal transplantation is performed in recent days more frequently than in the past. However, clinical situation of cadaveric transplantation in Korea is somewhat different from that in western countries and the outcome is different also. Materials and methods : We analyzed 22 cadaveric renal transplants performed at SoonChunHyang University Hospital from November, 1994 to June, 1998. Results : The mean age of recipients was 35.9 year(22-52). Male to female ratio was 13:9. Mean HLA mismatching number was 2.09. The immunosuppressive regimen was triple therapy based on cyclosporine. The incidence of delayed graft function was 18.2%(4 cases). The overall incidence of biopasy-proven rejection was 36.4%(8 cases). The factors affecting graft survival in cadaveric renal transplantation were the delayed graft funtion (p=0.002), rejection (p=0.014) and hypertension (p=0.025). The graft survival rate at 1, 2, 3 year was 86.4%, 86.4%, 81.8% respectively. Total 4 renal transplants were lost due to rejection. Conclusion : Our resuls was comparable to that the western countries. Careful manipulation of the donors and recipients and prevention of acute rejection are necessary to increase the survival of the cadaveric renal transplants.

        • KCI등재

          학봉종택 가도(家圖)의 분석을 통한 18세기 종택의 이건계획 및 건축적 특성

          유기원,김기주 한국건축역사학회 2009 건축역사연구 Vol.18 No.3

          Hakbongjongtaek(The head house of Uisong Kim family, 鶴峯宗宅), firstly built in the early 17th century, was moved to its neighboring place in the late 18th century. The man who led the relocation(移建) of the house was the eldest grandson of the family, Jong-soo, Kim. He made an overall plan and also participated in building the house. There remain four Gados(family paintings, 家圖) related to the relocation plan. This paper aims to make an analysis of these Gados, and through the analysis, to find what was the essential point of the relocation plan and how the point was represented in the paintings. The result of analysis is as follows: 1. The main focus of relocation plan was the form of Anchae(the inner house). Anchae was designed as asymmetrical form, and restricted to four kan. Only Andaechung needed to be 6 kan size for religious ceremonies. 2. For the design of Sarangchae, the displacement of large Sarangbang and small Sarangbang was an important issue. There were two ways of layout: parallel type and facing type. The latter was chosen. 3. The representation and techniques of Gado is quite concrete, in spite of differences among them. The expression of doors, windows, attic and kitchen was based on the understanding of space. Also the spatial division, which was expressed line on the grid, was based on the scaled ruler. As we've seen before, painting the relocation plan was a kind of endeavors to make the housing type as a realization of Garye. Also, we can find out that the role of the eldest grandson of the family was quite important to carry out the plan. As well as, it was meaningful to examine Sadaebu (the aristocrat of Chosun)'s perception of housing.

        • KCI등재
        • KCI등재

          경북 안동문화권 누(樓)재실의 건축적 특성

          유기원,김성우 한국건축역사학회 2007 건축역사연구 Vol.16 No.4

          There are a few hundreds of Jaesil architectures in Andong area, Kyungbook Province. Among them, about 25 of them have elevated pavilion, while all the rest do not have. This paper focus on these jaesils with elevated pavilion, and tried to identify the different types among them, the background of the beginning of these jaesils, as well as eleveted pavilion. Five different types could be clarified, and they could be reinterpreted according to the background cause of the construction of these types. Three major background reasons for the construction of jaesils with elevated pavilion, seems to be: 1) necessity of such pavilion to be able to clomplete the system of Jaesil, 2) borrowing of temple structure where there is not large wooden floor, and 3) eclectic combination of pavilion and main hall (Gangdand 講堂). Such study helps us understand not only the jaesils with eleveted pavilion, but also the general jaesils without eleveted pavilion. The inclusion of eleveted pavilion has a lot to do with the symbolic expression of the family, use of large space for the family gathering, as well as the popular trends of pavilion architecture of the time.

        • KCI등재

          KCl을 사용한 LiNi<sub>0.6</sub>Co<sub>0.2</sub>Mn<sub>0.2</sub>O<sub>2</sub>계 양극활물질의 잔류리튬 저감 및 전기화학특성 개선

          유기원,신미라,신태명,홍태환,김홍경,Yoo, Gi-Won,Shin, Mi-Ra,Shin, Tae-Myung,Hong, Tae-Whan,Kim, Hong-kyeong 한국전기화학회 2017 한국전기화학회지 Vol.20 No.1

          $LiNi_{0.6}Co_{0.2}Mn_{0.2}O_2$의 전구체 물질에 KCl을 첨가함으로써, 리튬카보네이트($Li_2CO_3$)와 리튬수산화물(LiOH)의 양을 감소시켰을 때 전기화학특성에 어떤 영향을 주는지에 대한 연구를 진행하였다. KCl을 1 질량 %로 전구체에 첨가하여 $800^{\circ}C$에서 열처리 한 샘플의 경우, 첨가하지 않은 재료와 대비하여 잔류하는 리튬카보네이트($Li_2CO_3$)는 8,464 ppm에서 1,639 ppm으로 리튬수산화물(LiOH)은 8,088 ppm에서 6,287 ppm으로 크게 감소하였다. XRD 분석결과 KCl의 첨가는 모상구조에 영향을 주지 않았으며, 층상구조 결정성이 약간 개선되는 효과가 확인되었다. 또한, 전하전달 저항($R_{ct}$)은 $255{\Omega}$에서 KCl 첨가 시 $99{\Omega}$으로 감소하였다. 초기 방전 용량은 171.04 mAh/g에서 182.73 mAh/g으로 증가하였으며 싸이클 특성도 개선되었다. 특히, AFM 분석을 통하여 표면적이 50% 감소하는 것을 확인하였는데, 이는 잔류리튬의 산화반응으로 인한 열 때문일 것으로 해석되고, 전해질과의 부반응을 억제할 수 있는 장점이 있었다. 잔류리튬 제거를 위해 KCl을 첨가한 연구는, 아직까지 발표된 바가 없으며, $LiNi_{0.6}Co_{0.2}Mn_{0.2}O_2$계 양극활물질의 전기화학특성을 개선하는데 매우 효과적임을 본 연구를 통해 확인할 수 있었다. Using a precursor of $LiNi_{0.6}Co_{0.2}Mn_{0.2}O_2$ as a starting material, a surface-modified cathode material was obtained by coating with KCl, where the added KCl reduces residual Li compounds such as $Li_2CO_3$ and LiOH, on the surface. The resulting electrochemical properties were investigated. The amounts of $Li_2CO_3$ and LiOH decreased from 8,464 ppm to 1,639 ppm and from 8,088 ppm to 6,287 ppm, respectively, with 1 wt% KCl added $LiNi_{0.6}Co_{0.2}Mn_{0.2}O_2$ that had been calcined at $800^{\circ}C$. X-ray diffraction results revealed that 1 wt% of KCl added $LiNi_{0.6}Co_{0.2}Mn_{0.2}O_2$ did not affect the parent structure but enhanced the development of hexagonal crystallites. Additionally, the charge transfer resistance ($R_{ct}$) decreased dramatically from $225{\Omega}$ to $99{\Omega}$, and the discharge capacity increased to 182.73mAh/g. Using atomic force microscopy, we observed that the surface area decreased by half because of the exothermic heat released by the Li residues. The reduced surface area protects the cathode material from reacting with the electrolyte and hinders the development of a solid electrolyte interphase (SEI) film on the surface of the oxide particles. Finally, we found that the introduction of KCl into $LiNi_{0.6}Co_{0.2}Mn_{0.2}O_2$ is a very effective method of enhancing the electrochemical properties of this active material by reducing the residual Li. To the best of our knowledge, this report is the first to demonstrate this phenomenon.

        • KCI등재

          Optimization of the Synthesis of Low-cobalt Li[Ni0.6Co0.1Mn0.3]O2 for Use as Cathode Materials for Lithium-ion Batteries

          유기원,박태준,김정,장병찬,양수빈,손종태 한국물리학회 2015 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.66 No.1

          Low-cobalt Li[Ni0.6Co0.1Mn0.3]O2 cathode materials were synthesized by using a hydroxide coprecipitationmethod. Because we wanted to optimize the synthesis conditions, we studied theeffects of different lithium contents and calcination temperature on the structural and the electrochemicalproperties of this unfamiliar cathode material. All as-prepared materials were indexedin the R-3m space group, and all samples showed different structural and electrochemical propertiesfor different synthesis conditions. In particular, in the case of NCM-4 (lithium content: 1.09,calcination temperature: 850 C), the sample showed excellent electrochemical properties with a reversiblespecific capacity of 175.00 mAhg−1 [cut-off voltage: 3.0 4.3 V, 0.1 C (current density: 17mAhg−1)] and a good capacity retention of 91.7% after 50 charge/discharge cycles [cut-off voltage:3.0 4.3 V, 1 C (current density: 170 mAhg−1)].

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