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최근 클라우드 컴퓨팅 기술의 발전과 함께 미국과 같은 선진국들은 클라우드 도입 정책들을 통해 국방 및 공공부문 효율화, 국가혁신 추진, 클라우드 컴퓨팅 이용 환경 개선을 위한 인프라 구축 등을 추진 중이다. 한국도 클라우드법을 제정하고 여러 분야에서의 클라우드 도입을 고려중이다. 특히 국방 분야에서도 지휘통제체계에 클라우드 적용을 고려중이며 관련 연구수행과 시범 사업을 진행하고 있다. 그러나 현 한국군 정보시스템이 클라우드 컴퓨팅 시스템으로 전환되었을 경우, 기존의 보안 요구사항만으로는 클라우드 컴퓨팅 관련 보안 취약점을 해결할 수 없다. 즉, 클라우드 기반의 안전한 지휘통제체계 시스템을 구축하기 위해서는 기존 보안 요구사항에 부족한 클라우드 컴퓨팅 관련 보안 요구사항을 추가로 도출할 필요가 있으며, 이를 기반으로 보안 아키텍처 설계가 필요하다. 본 논문에서는 클라우드 기반 지휘통제체계가 갖추어야 할 보안 요구사항을 도출하고 이를 기반으로 설계된 보안아키텍처를 제안한다. With the development of cloud computing technology, developed countries including the U.S. are performing the efficiency of national defense and public sector, national innovation, and construction of the infrastructure for cloud computing environment through the policies that apply cloud computing. Republic of Korea is also enacting the cloud act and considering cloud adoption in various fields. In particular, it is considering the applying the cloud to the command control system in the national defense sector, and is conducting related research and pilot projects. However, if the existing korea information system is converted to a cloud computing system, only existing security requirements cannot solve the problem related security vulnerabilities of cloud computing. Therefore, in order to build a cloud-based secure command control system, it is necessary to derive additional cloud computing-related security requirements that are lacking in the existing security requirements and to build the secure national defense command and control system architecture based on it. In this paper, we derive security requirements for cloud-based command control system and propose a security architecture designed based on it.
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Suncheon City Regeneration Project is known as the concept of cultural residents. Through the previous projects, the residents capabilities have been improved, and the projects have been carried out according to their strategies. For this reason, participants in urban regeneration projects are important. The purpose of this study is to actually identify the ‘rescue center and ‘direct relationship with the analysis utilizing the characteristics of social networks NetMiner solution of the participants, who led the project, Suncheon. Surveys and interviews were conducted for participants, and the characteristics of social networks were analyzed in time series to quantify and visualize the results. As a result of the analysis, social networks were changed among the participants before and after the urban regeneration project. Initially, loose networks were denser over time, and initially networks formed only around participants were expanded over time. Network analysis has revealed that the system is strengthening with urban regeneration projects in the form of public and public-private cooperation. This highlights the need for a city-centered urban regeneration strategy centered on people and shows that a dense network of participants can be a success factor.
A prospective study was conducted to see the changes of immunologic indices and its significance in various renal diseases. Study population consist of 129 children; MCNS 42, MsPGN 10, MGN 4, FSGS 3, MPGN 2, RGH 32, HSP nephritis 28, and PIGN 8 cases. The following result was obtained. Total T cell (%) was increased druing relapse period of MCNS, MGN and MPGN compared to control, and changes of T cell susets was most marked in MCNS, showing decreased T_4 and T_8 resulting in low T_4/T_8 ratio during relapse period compared to remmision period. Serum immunoglobuling showed decreased IgG in MCNS, MsPGN, MGN and elevated IgM showed significant elevation during both relapse and remmision period compared to control group. In both IgA nephropathy and HSP nephritis, total T cell and T_4/T_8 ratio was increased during hematuric phase compared to control group, and in IgA nephropathy, T_4 cell was increased during hematuric phase compared to non-hematuric phase. Serum immunoglobulin showed increased IgA abd IgE in IgA nephropathy, and increased IgA and no significant change of IgE in HSP nephritis during hematuric phase. In summary, it can be concluded that both cellular and humoral immune mechanism play a significant role in the pathogenesis of primary renal diseases.
A Study on characteristics of the internal flow in a circular pipe by ultrasonic sound pressure was carried out with a 28kHz PZT BLT. In order to investigate the flow characteristics according to the liquid load, the Langevin bolted transducer was set in an acrylic tube as a piston type without liquid leakage. Phenomena of the internal flow of liquid were measured at 3 load levels by PIV. Velocity vector, velocity profile and turbulent kinetic energy distribution were visualized and observed. In results, several internal flow characteristics by ultrasonic vibrations were examined.
Enhancement of turbulent flow is needed to increase the efficiency of heat transfer between fuel bundles and coolant in the nuclear reactor. The analysis of flow within a coaxial circular pipe by a jet pump to supply coolant and the method of turbulent flow enhancement with minimum power losses have to be investigated. In this study, the application of the digital imaginary method to analyze characteristics of the circular jet flow has been established and a method to enhance turbulent flow researched with adding ultrasonic vibration. In results, characteristics of flow such as velocity distribution, entrainment, vortex, separation, reattachment, and time mean kinetic energy were obtained and the efficiency of turbulent flow enhancement by ultrasonic vibration was examined.
A prospective study was conducted to determine the change of serum IgE and its significance in children with minimal change nephrotic syndrome(MCNS). Study population consisted of 33 biopsyproven MCNS and these children were grouped into infrequent relapser(IR, 3 cases), steroid dependant/frequent relapser(SD/FR, 25 cases), and partial responder(PR, 5 cases), according to the steroid therapy. Ten healthy children aged 2-12 year were used as control group. The foiiowing results were obtained. During relapse, serum IgE showed significant elevation(376.8±401.6 IU/dL) compared to the controls(48.8±36.9)(p<0.05). IgE elevation was more marked in SD/FR and PR group compared to IR group. In SD/FR group with positive allergy history, IgE elevation persisted into remmision period. However, it decreased to near normal range in SD/FR group without allergy history. In PR group, elevated IgE persisted into remmision period irrespective to allergy history. Proportion of lymphocytes bearing FCε R showed elevated level of 11.5±8.5% during relapse compared to 5.2±3.5 during remmision period. In summary, present study shows that high serum IgE and lympocyte bearing FCε R is seen during relapse period of MCNS irrespective to allergy history, especially in SD/FR and PR group, suggesting that immunologic mechanism involving IgE plays a significant role in the pathogenesis of MCNS.