• Korean Management Science Review
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• v.26 no.3
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• pp.205-221
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• 2009

Countries around the world are actively investing in development and industrial application of RFID, a new wireless communications technology widely perceived as a next-generation growth engine with the potential for creation of new business value. In this paper, we empirically study factors influencing the acceptance of RFID by stage of introduction, to contribute making policies aimed at stimulating demand for this technology and accelerating its penetration. The process of acceptance of RFID was divided, in this paper, into three stages: perception, adoption and implementation, and influence factors, both Internal and external to an organization, drawn from existing literature, are analyzed. A conceptual model comprising internal influence factors, including technical, organization and economic factors, and external factors related to environment and this model was tested through structural equation analysis. To obtain data for empirical analysis, we surveyed public institutions and general companies that are potential users of RFID. The data thus collected were analyzed to determine factors influencing the acceptance of RFID by stage, and practical implications for the RFID promotion policy at the level of demand creation and industrial application were derived from the results of this analysis.

• Journal of Biosystems Engineering
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• v.17 no.1
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• pp.37-44
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• 1992

This study was intended to develop the design program of the working surface of moldboard-plow by use of the computer-aided design. The mathematical model of the working surfaces of moldboard-plows by use of computer graphics was developed and plotted in two dimension on three major planes. The surfaces of moldboard-plows were represented with "B-spline surface fitting" by selecting the twenty-five three-dimensional data that could well describe the working surface of moldboard-plow. The shape of moldboard-plow on three major planes was drawn for varied design parameters. The representation of the mathematical model for the working surfaces of various types of moldboard-plows was manipulated by translation, rotation and scaling about arbitrary axes in space. By using three-dimensional graphics techique to describe moldboard-plows, it was capable of plotting the three-dimensional shape of moldboard-plow easily and quickly in comparison with the existing design methods that were difficult to grasp the shape of moldboard-plow as a whole. The design theories of moldboard plow and three-dimensional computer graphic technique were applied to find out the improved reversible Jaenggi bottom. It was resulted in the newly developed shape of Jaenggi which may be used for improving the performance compared to existing ones.

• KIEE International Transactions on Power Engineering
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• v.2A no.4
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• pp.131-135
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• 2002

This paper describes a new ultra-fast contingency screening algorithm for on-line TSA without time simulation. All machines are represented in a classical model and the stability index is defined as the ratio between acceleration power during a fault and deceleration power after clearing the fault. Critical clustering of machines is done based on the stability index, and the power-angle curve of the critical machines is drawn assuming that the angles of the critical machines increase uniformly, while those of the non-critical ones remain constant. Finally, the critical clearing time (CCT) is computed using the power-angle curve. The proposed algorithm is tested on the KEPCO system comprised of 900-bus and 230-machines. The CCT values computed with the screening algorithm are in good agreement with those computed using the detailed model and the SIME method. The computation time for screening about 270 contingencies is 17 seconds with 1.2 GHz PC.

• 한국기계연구소 소보
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• s.19
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• pp.125-139
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• 1989

As an adaptive control function generator, the CMAC (Cerebellar Model Arithmetic or Articulated Controller) based learning control has drawn a great attention to realize a rather robust real-time manipulator control under the various uncertainties. There remain, however, inherent problems to be solved in the CMAC application to robot motion control or perception of sensory information. To apply the CMAC to the various unmodeled or modeled systems more efficiently, it is necessary to analyze the effects of the CMAC control parameters on the trained net. Although the CMAC control parameters such as size of the quantizing block, learning gain, input offset, and ranges of input variables play a key role in the learning performance and system memory requirement, these have not been fully investigated yet. These parameters should be determined, of course, considering the shape of the desired function to be trained and learning algorithms applied. In this paper, the interrelation of these parameters with learning performance is investigated under the basic learning schemes presented by authors. Since an analytic approach only seems to be very difficult and even impossible for this purpose, various simulations have been performed with pre specified functions and their results were analyzed. A general step following design guide was set up according to the various simulation results.

• Journal of Information Science Theory and Practice
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• v.4 no.1
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• pp.30-48
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• 2016

The study tested a hybrid model with constructs drawn from the Technology Acceptance Model (TAM) and Diffusion of Innovation (DOI) theory in order to examine the moderating effect of productivity and relative advantage (RA) on perceived usefulness (PU) vis-à-vis electronic information resources (EIR) adoption in private university libraries in Ogun and Osun States of Nigeria. The descriptive research design was adopted in the study. The population consisted of 61 (55.0%) librarians and 50 (45.0%) library officers (totaling 116—100%) in Babcock University, Bells University, Covenant University, Bowen University, Oduduwa University, and Redeemer's University. Purposive sampling procedure was adopted after which total enumeration was used since the total population is small. The questionnaire was used for data collection. Of the 116 copies of the questionnaire administered, 111 (95.7%) were found usable. The instrument was structured based on a 4-point Likert agreement scale of Strongly Agree, Agree, Disagree, and Strongly Disagree. Data were analyzed using descriptive statistics like tables of frequency counts and percentage. The findings revealed that productivity and relative advantage are significant moderators of perceived usefulness of EIR adoption in private university libraries in Ogun and Osun States, Nigeria.

• Journal of Fisheries and Marine Sciences Education
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• v.28 no.4
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• pp.936-946
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• 2016

The purpose of this study is to examine structural relations between the emotional leadership of educational administrative officials' superiors and subordinates' empowerment and job satisfaction. To attain the study goal, this researcher finally selected 368 educational administrative officials working in Gyeongsangbuk-do and conducted statistical analysis. Accordingly, this study has drawn the following detailed conclusions: First, there is statistically significant positive correlation among the subfactors of the emotional leadership of educational administrative officials' superiors and subordinates' empowerment and job satisfaction. Second, it has been found that the hypothetical path model to explain the emotional leadership of educational administrative officials' superiors and subordinates' empowerment and job satisfaction is appropriate. In other words, among the goodness-of-fit indexes of the final study model, ${\chi}^2=203.657$ (p<.001), RMR equals .030, RMSEA is .093, GFI equals .910, and AGFI is .900. About its relative goodness-of-fit indexes, TLI equals .930, NFI is .933, CFI equals .948, and IFI is .949; therefore, all indexes have been found to be allowable. Third, emotional leadership of educational administrative officials' superiors have had this influence directly on job satisfaction. But, the total influence of the emotional leadership of educational administrative officials' superiors on job satisfaction is smaller than that on job satisfaction with the mediation of subordinates' empowerment.

• Proceedings of the Korea Concrete Institute Conference
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• 2005.05b
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• pp.5-8
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• 2005

This research is to present experimental materials model of high strength concrete for prediction of fire safety of structural members based on mechanical properties of materials during heating up to 800$^{circ}C$. The following conclusions are drawn from this study. First of all, between 100 to 200$^{circ}C$, the high strength concrete show degradation at 100$^{circ}C$ and restoration at 200$^{circ}C$. The high strength concrete show elastic deformation at 20 - 200$^{circ}C$. Second, between 300 to 400$^{circ}C$, the mechanical properties of the high strength concrete which are exposed to fire show $75\~95\%$ as compared to the original properties because the thermally expanded ingredients of concrete, aggregates and cement paste, etc. Finally, beyond 600$^{circ}C$, the high strength concrete shows $75\~80\%$ reduction in thermal properties as compared to the normal concrete in the range of 600 to 800$^{circ}C$ and it shows $10\~30\%$ as compared to the original properties.

• International Journal of Fluid Machinery and Systems
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• v.4 no.1
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• pp.191-198
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• 2011

Based on the consideration that the cavitation would affect the operation stability of miniature pumps, the 3-D turbulent cavitating flow in a test pump was simulated by using a mixed cavitation model and k-${\omega}$ SST turbulence model. In order to investigate the influence of inlet geometry parameters on the cavitation performance of the miniature pump, two more impellers are designed for comparison. Based on the results, the following conclusions are drawn: 1) Cavitation performance of the double suction shaft-less miniature pump having different impeller is equivalent to the centrifugal pump having ordinary size, though the flow passage at impeller inlet is small; 2) The miniature pump having radial impeller can produce much higher pump head, but lower cavitation performance than that having the impeller based on the conventional design method; 3) It is believed that by applying the double suction design, the miniature pump achieved relatively uniform flow pattern upstream the impeller inlet, which is favorable for improving cavitation performance.

• Journal of the Korean Home Economics Association
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• v.38 no.10
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• pp.199-213
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• 2000

The purpose of this study was to investigate the effect of mother's depression, mother's negative self-acceptance, and father's psychological health perceived by mother, meditated by marital quality, on children's internalizing & externalizing behaviors. On the basis of precious literature, the theoretical model was specified and estimated. Subjects of this study consisted of 285 preschool children's mothers(160 boys and 125 girls aged from 5- to 7-year-old) drawn from fine child-care centers in Chung-ju City. The results were as following: Mother's depression was a statistically significant factor directly influencing on children's internalizing & externalizing behaviors and indirectly influencing on children's internalizing behavior through the marital quality. 2. Mother's negative self-acceptance was a statistically significant factor indirectly influencing on children's internalizing behavior through the marital quality. However, it did not haute any effects on either children's internalizing behavior or externalizing behaviors. 3. Father's psychological health perceived by mother was a statistically significant factor indirectly influencing on children's internalizing behaviors through the marital quality and directly influencing on children's externalizing behaviors. 4 Marital quality was strongly related to children's internalizing behaviors both directly and indirectly, however, it was not statistically associated with children's externalizing behaviors. Therefore, the model showed marital quality can be a mediating variable for children's internalizing behaviors only. The findings of results is to generate more broad-minded thinking about how mother's psychological factors, marital quality, and children's internalizing behaviors are interrelated.

• Journal of Families and Better Life
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• v.19 no.6
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• pp.35-50
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• 2001

The purpose of this study was to examine the effects of family violence, peer\`s deviant behavior, school environment, and accessibility of violence through a mass media, mediated by school violence, on adolescents 'psychological & behavioral maladjustment. The present study was the primary research of developing program for adolescents'psychological & behavioral adaptation to school violence. On the basis of previous literature, the theoretical model was specified, estimated, and evaluated for adequacy of statistical fat. Subjects of this study consisted of 974 adolescents drawn from middle and high schools in Cheong-ju. The model was supported by the data. Family violence, peer's deviant behavior, school environment, and accessibility of violence through a mass media explained directly the variance of school violence and adolescents'psychological & behavioral maladjustment. The results shows that adolescents'psychological & behavioral maladjustment can be viewed as products of the interaction with environmental factors and school violence. Accessibility of violence through a mass media was strongly related to school violence. Also, school violence was the strongest risk factor in relation to adolescents'behavioral maladjustment while school environment to adolescents'psychological maladjustment. Therefore, prevention program for school violence should consider the psychological & behavioral components within the environmental context.