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본 연구는 환율과 주가 두 변수간의 상호영향을 분석함에 있어서 연구기간이 일반적인, 비교적 긴 기간에만 집중되고 있는 대부분의 기존연구와 달리 이벤트 중심으로 두변수간의 관계를 분석하였다. 금융시장이 전면적으로 개방된 시점인 1997년부터의 KOSPI지수와 원/달러 명목환율의 일별자료를 이용하여 두 시계열변수간의 상관관계와 선후행관계에 대하여 알아보았다. 분석결과, 첫째, 안정성검정에 있어서 ADF 단위근검정 방법을 사용하였는데 이벤트 발생 후 1개월 기간을 제외한 나머지 기간에는 1차 차분을 통하여 불안정성이 제거 되는데, 이는 이벤트 발생 후 1개월 이내에는 시계열이 상대적으로 더욱 불안전하다고 해석할 수 있다. 둘째, 그랜저 인과관계 분석을 진행하여 선후행관계에 대하여 분석한 결과, 이벤트 발생 후 1년 정도의 기간에 대체적으로 선후행관계가 비교적 선명하게 나타났다. 글로벌 금융위기일 경우에는 이벤트 발생 후 8개월 기간의 여러 기간에 대하여 일관되게 환율이 주가를 선도하는 관계가, 외환위기일 경우에는 이벤트 발생 후 1년 기간에 미미한 피드백관계가 나타났다. 셋째, 교차상관관계 분석은 그랜저 인과관계 분석결과를 강력하게 지지해주고 있다. 글로벌금융위기의 경우에는 환율이 선도할 경우 선명한 정의 상관관계를 나타내어 전통적 접근을 따르고 있으나 외환위기의 경우에는 그 관계가 미미하게 나타났다. 또한 대체로 이벤트 발생 시점에서 가까운 기간일수록 두 시계열변수간의 상관관계가 더욱 선명하게 나타났다. We analyzes the interaction between Exchange rates and stock prices, focusing on a relatively short period of time and events, unlike most of the previous studies analyzed the long relationship between two variables. First, in the ADF unit root test, except for the period of one month period, the primary difference is removed through the instability. Second, the Granger causality analysis proceeds for the analysis of precedence relations, event for a period of one year after the precedence relations. If the global financial crisis period of 8months after the occurrence of the event leading to consistently exchange relationship, when the crisis in the 1-year period after the occurrence of an event related feedback was minimal. Third, the cross-correlation analysis strongly supported Granger causality. In the case of the global financial crisis, when the exchange rate leading a clear positive correlation follows the traditional approach, but in the case of the financial crisis that the relationship was insignificant. In addition, more short-term correlation were more clearly.
The ride-through control of a doubly-fed induction generator (DFIG) for the voltage sags on wind farms utilizing crowbar circuits by which the rotor side converter (RSC) is disabled has being reported in many literatures. An analysis and calculation of the transient current when the RSC is switched off are of significance for carrying out the low voltage ride through (LVRT) of a DFIG. The mathematical derivation is highlighted in this paper. The zero-state and zero-input responses of the transient current in the frequency domain through a Laplace transformation are investigated, and the transient components in the time domain are achieved. With the characteristics worked out from the linear resolving without modeling simplification, the selection of the resistance in the linear crowbar circuit and the value conversion from a linear circuit to a nonlinear one is proposed to setup the attenuation rate. In terms of grid code requirements, the theoretical analysis for the time constant of the transient components attenuation insures the controllability when the excitation of the RSC is resumed and it guarantees the reserved time for the response of the reactive power compensation. Simulations are executed in MATLAB/SIMPOWER and experiments are carried out to validate the theoretical analysis. They indicate that the calculation method is effective for selection of the resistance in a crowbar circuit for LVRT operations.
This study focused on the enzymatic biotransformation of the major ginsenoside Rb1 into Rd for the mass production of minor ginsenosides using a novel recombinant β-glucosidase from Flavobacterium johnsoniae. The gene (bglF3) consisting of 2,235 bp (744 amino acid residues) was cloned and the recombinant enzyme overexpressed in Escherichia coli BL21(DE3) was characterized. This enzyme could transform ginsenoside Rb1 and gypenoside XVII to the ginsenosides Rd and F2, respectively. The glutathione S-transferase (GST) fused BglF3 was purifi ed with GST-bind agarose resin and characterized. The kinetic parameters for β-glucosidase had apparent Km values of 0.91±0.02 and 2.84±0.05 mM and Vmax values of 5.75±0.12 and 0.71±0.01 μmol·min-1·mg of protein-1 against p-nitrophenyl-β-D-glucopyranoside and Rb1, respectively. At optimal conditions of pH 6.0 and 37°C, BglF3 could only hydrolyze the outer glucose moiety of ginsenoside Rb1 and gypenoside XVII at the C-20 position of aglycon into ginsenosides Rd and F2, respectively. These results indicate that the recombinant BglF3 could be useful for the mass production of ginsenosides Rd and F2 in the pharmaceutical or cosmetic industry.
Perforated plates have been widely used in combustors to attenuate harmful sounds. In this study, the acoustic absorption capability of plates with heterogeneously distributed holes under bias flow was evaluated in an impedance tube, and the sound attenuation effect of each plate located in the liquid fuel combustor inlet section was experimentally studied. The perforated plate with heterogeneously distributed large holes showed the best control effect under the designed experimental conditions. After control, the peak dynamic pressure in the chamber and plenum decreased by 90 % and 75 %, respectively, and the reduction in the heat release fluctuation was 60 %. When the primary air flow rate deviated from the optimal value, the plate with large holes still reduced the pressure amplitude in the chamber by approximately 70 %. It was also found that installing the perforated plate with a back cavity had the dual effect of gaining and damping combustion instability.
In this paper, we propose to explore ways to create internal motivation to enhance the job disposition of Korean and Chinese employees. In order to achieve this goal, we would like to select parameters that may trigger an increasing number of internal motivations for interest in recent years: perceived organisational support, perceived provider support, and perceived peer support, and to explore the impact on job embeddedness. I would like to find out the effect of job embodiedness on involved beauty. The process also seeks to verify that China and South Korea are different. To verify the research theory of this research, we will use a questionnaire to researchers of automotive companies using VR technology in Gyeonggi-do, Korea and Hadong-seong, China, and conducted a survey. A total of 200 pairs of questionnaires were distributed to the study subjects, 195 of which were retrieved, 191 of which eliminated unfaithful responses were used for the final analysis. The collected data were used for frequency analysis, exploratory factor analysis, reliability analysis, confirmatory factor analysis, correlation analysis, structural equation analysis. The results of this study, identified through empirical analysis, can be summarized as follows: First, Perceived Organizational Support, Perceived Supervisor Support will have a positive impact on Job Embeddedness. Second, Job Embeddedness will have a positive influence on the Innovative Beehivior. Third, Perceived Organizational Support, Perceived Supervisor Support will have a partial positive effect on Innovative Behavior. Fourth, the formation process and influence of Job Embeddedness of corporate employees in Korea and China are partly different, the report showed. 본 연구는 한국과 중국 조직 구성원의 직무배태성을 높이기 위해 내적동기를 유발시킬 수 있는방법을 탐색하고자 한다. 이러한 목적을 달성하기 위해 최근 관심이 증가되고 있는 내적동기를유발시킬 수 있는 변수인 조직지원인식, 상사지원인식, 동료지원인식을 선정하고 직무배태성에 미치는 영향을 알아보고자 하고 직무배태성이 혁신행동에 미치는 영향을 알아보고자 한다. 또한 이과정은 중국과 한국은 차이가 있는 지롤 검증하고자 한다. 본 연구의 연구가설을 검증하기 위해한국 경기도와 중국 하복성에 있는 VR기술을 활용한 자동차 기업의 연구원들을 대상으로 설문지를 이용할 것이며, 설문조사 실시하였다. 연구의 대상들에게 총 200 쌍의 설문지를 배포하였으며, 그 중 195쌍이 회수되었으며, 회수된 설문지 중 불성실한 응답을 제거한 191쌍이 최종분석에 이용되었다. 수집된 자료들을 SPSS 24.0과 AMOS 24.0을 사용하여 빈도분석, 탐색적 요인분석, 신뢰도분석, 확인적 요인분석, 상관관계분석, 구조방정식모형분석 등을 실시하였다. 실증분석을 통해 확인된 본 연구의 결과는 다음과 같이 요약될 수 있다. 첫째, 지원인식(조직지원인식, 상사지원인식, 동료지원인식)이 직무배태성에 정(+)의 영향을 미칠 것이다. 둘째, 직무배태성은 혁신행동에 정(+)의 영향을 미칠 것이다. 셋째, 지원인식(조직지원인식, 상사지원인식, 동료지원인식)이 혁신행동에 부분적으로 정(+)의 영향을 미칠 것이다. 넷째, 한국과 중국에 있는 기업 직원의 직무배태성의 형성과정과 영향력이 부분적으로 차이가 있는 것으로 나타났다.
Natural ester is a suitable substitute for mineral oil and has been widely used in AC transformer in many countries. In order to further application of natural ester in direct current (DC) equipment, it is needed to investigate its long term insulation property under DC condition. In this paper, a thermal ageing experiment was conducted for both mineral oil-paper and natural ester-paper insulation. The DC breakdown and space charge characteristics of insulation paper impregnated with natural ester and mineral oil was compared. Results show that the resistivity of the paper immersed in natural ester and mineral oil both increase as the ageing goes on. While insulation paper impregnated with natural ester has higher resistivity and DC breakdown voltage than the paper impregnated with mineral oil. The DC breakdown voltage for the oil impregnated insulation paper being DC pre-stressing is higher than that without pre-stressing. The average DC breakdown field strength difference between the test with pre-stressing and without pre-stressing clearly shows that there is an apparent enhancement effect for the homo-charge injection on the DC breakdown.
The binding abilities of scutellarin (Scu) andscutellarein (Scue) with bovine serum albumin (BSA) wereinvestigated using equilibrium dialysis, high performanceliquid chromatography, fluorescence spectroscopy, competitivesite marker and molecular docking. The resultsshowed that the average protein binding ratios of Scu andScue with BSA were (79.85 ± 1.83) and (85.49 ± 1.21) %respectively. Under simulated physiological conditions, thefluorescence data indicated that Scu and Scue bound withBSA through a static mechanism. The thermodynamicparameters indicated that the interactions of Scu-BSA andScue-BSA mainly occurred by van der Waals forces andhydrogen bonds and it was easier for Scue to bind withBSA than Scu, indicating that the glucuronic acid moleculein Scu decreased the binding affinity. Site competitivemarker experiments showed that the binding sites of Scuand Scue mainly located within the sub-domain IIA ofBSA. Furthermore, molecular docking studies indicatedthat one BSA could bind three Scue, while one BSA couldcarry only two Scu. All these results clearly indicated theinteractions of Scu and Scue with BSA, which will lay thefoundation for further research to determine the pharmacologyand pharmacodynamics of Scu and Scue for treatingischemic cerebrovascular disease.
A bogie frame is a key component of high-speed rail; higher requirements of the safety and stability of the bogie frame are put forward with the continuous improvement of the train speed. In this study, we first performed a strength analysis of a bogie frame according to the JIS E 4207 standard by using finite element method. Then, we did a reliability analysis of the bogie frame. The reliability problems are defined as strength reliability and resonant frequency reliability, which indicate the structural safety and stability of the bogie frame. The reliability estimation is realized by experimental design, artificial neural network and stochastic perturbation theory. Additionally, reliability-based sensitivity indices were derived to measure the parameter importance of random input variables. An illustrative example of the bogie frame with incomplete probabilistic information was used to demonstrate the applications of the proposed method for reliability and reliability-based sensitivity estimation in terms of strength and resonant frequency reliability. The results indicate that vertical loads and the material density have more of an impact on reliability than other variables of the bogie frame.
Fagaceae is one of the plant family which dominate the broad-leaved forests in Taiwan and have considerable value in economy and ecology. Traditionally, plant species identification based on leaf morphologies and is conducted using naked-eye observation. This study is proposed to distinguish the Fagaceae species using image processing and machine learning. In this study, leaf images of 10 Fagaceae species were collected. A serial of traits relevant to leaf morphologies, such as morphological, color, shape, and venation traits, were quantified from the leaf images. A support vector machine classifier was then developed to identify the species using the quantified traits. The proposed approach reached an identification accuracy of 95.8%.
This paper deals with the robust guaranteed-cost H∞ reliable control problem for delta operator switched uncertain linear systems with actuator faults. The upper bound of the guaranteed-cost function is determined and the closed-loop system can be guaranteed some H∞ performance by using arbitrary and state switching control approaches. Finally, a simulation example is provided to illustrate the efficiency of the proposed methods.