• Smart Structures and Systems
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• v.15 no.4
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• pp.963-995
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• 2015

The effectiveness of the various control algorithms for semi-active structural control systems proposed in the literature is highly questionable when dealing with earthquake actions, which never reach a steady state. From this perspective, the paper summarizes the results of an experimental activity aimed to compare the effectiveness of four different semi-active control algorithms on a structural mock up representative of a class of structural systems particularly prone to seismic actions. The controlled structure is a near full scale 2-story steel frame, equipped with two semi-active bracing systems including two magnetorheological dampers designed and manufactured in Europe. A set of earthquake records has been applied at the base of the structure, by utilizing a shaking table facility. Experimental results are compared in terms of displacements, absolute accelerations and energy dissipation capability. A further analysis on the percentage incidence of undesired and/or unpredictable operations corresponding to each algorithm gives an insight on some factors affecting the reliability and, in turn, the real effectiveness of semi-active structural control systems.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.25 no.7
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• pp.767-773
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• 2014

This paper presents the reduction characteristics of electromagnetic penetration through a slit in conducting screen by loaded plate. The FDTD method is used in theoretical analysis. And the characteristics of penetrated electric fields are calculated in terms of length, width, shape, position, and height of the loaded plate to find out how the geometry of plate influences the reduction characteristics of the electromagnetic penetration and shielding effectiveness. The results show that the characteristics of penetrated electric field and shielding effectiveness depend on the geometry of loaded plate. In particular, the optimal geometry of loaded plate which minimize penetrated electric field are verified.

• Journal of Venture Innovation
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• v.1 no.1
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• pp.113-127
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• 2018

The purpose of this study was to investigate the determinants of organizational trust and its effect on organizational effectiveness in the public organizations. This study examined five factors of organizational competencies, consideration, fairness, organizational morality and organizational social responsibility as the determinants of organizational trust and job satisfaction, organizational commitment and intend to leave as the indicators of organizational effectiveness. For this study, data were collected from 323 public officials in Gyeonggi Province with structured questionnaires and analyzed using structural equation modelling technique. This study found that organizational competencies, consideration, fairness, organizational morality and organizational social responsibility made significant contributions to the formation of organizational trust and that organizational trust impacted positively organizational effectiveness measured in terms of job satisfaction, organizational commitment and intend to leave.

• The Journal of the Korea Contents Association
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• v.14 no.7
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• pp.435-448
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• 2014

The purpose of this study was to investigate the effects of distributive and procedural justice on organizational effectiveness and the mediating role of supervisor trust among the MICE industry employees. For the study, data were collected from 303 MICE industry employees in metropolitan area by self-administered questionnaires. Collected data were analyzed using structural equation modeling technique. The results of this study showed that organizational justice had effects on organizational effectiveness measured in terms of job satisfaction, organizational commitment and organizational citizenship behaviour of MICE industrial employees and that supervisor trust mediated the relationship between organizational justice and organizational effectiveness. Based on the results of this study, the theoretical implications of the findings were discussed and directions for future research were advanced.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.21 no.9
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• pp.331-337
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• 2020

study analyzed the relationship between ChildCare Teachers' Office Stress on Happiness with Teacher Effectiveness. A survey was conducted on 243 childcare teachers in J area. The collected data was analyzed using the JAMOVI program to analyze the mediated effects and technical statistics. Results found that office stress, teacher efficacy, and sense of happiness of childcare teachers were found to meet the normality assumption. Second, the analysis of the relationship between office stress, teacher efficacy, and happiness showed a statistically significant negative correlation between administrative stress and teacher efficacy and happiness and teacher efficacy showed a significant positive correlation. Higher office stress led to less teacher effectiveness and happiness, and higher happiness led to higher teacher effectiveness. Third, office stress is a significant predictor of happiness and teacher's efficacy. In conclusion, office stress should be considered important in terms of happiness and teacher effectiveness and the direction of improvement in the treatment of child care teachers was suggested.

• Journal of Practical Engineering Education
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• v.16 no.2
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• pp.215-226
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• 2024

This study analyzed the performance of educational program for the employees of the work-learning dual system training center using the results of the satisfaction survey of 2,543 and then, suggested implications for enhancing the effectiveness of the curriculum. As a result of the analysis, this educational program showed very high level of satisfaction and was evaluated to provide successful education. Education participant satisfaction was found to be affected by the curriculum situation and participant characteristics. Satisfaction in terms of instructor, subject, facility environment, and operation was all found to have a significant influence on the effectiveness of the educational program for employees of the work-learning dual system training center.

• Journal of Digital Convergence
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• v.13 no.10
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• pp.165-170
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• 2015

This study attempted to investigate an efficient human resources management plan by enhancing organizational performance and reducing the factors which influence turnover intention after analyzing the effects of job burnout on organizational effectiveness and turnover intention. To test a research model, after explaining the purpose of the study to them at work, data were obtained through a standardized questionnaire survey. To figure out the effects of job burnout on organizational effectiveness and turnover intention, causality was analyzed using the Structural Equation Model (SEM). According to hypothesis testing, a total of five hypotheses were chosen, and the following results were obtained: Job burnout had a significant effect on organizational commitment (-0.456), job satisfaction (-0.488) and turnover intention (0.501). In terms of relations between organizational effectiveness and turnover intention, organizational commitment (-0.350) and job satisfaction (-0.199) decreased turnover intention. Therefore, it is important to discover and analyze these obstacles which hinder employees from being absorbed in their work with attachment.

• Journal of the Korean housing association
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• v.24 no.2
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• pp.89-96
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• 2013

Urban design is a specific and detailed action plan which regulates from the development plan to the architectural characteristics of every building and now many new towns by Urban design has been developed after 2000. But recently doubts about the effectiveness of Urban design have been raised in locals. The purpose of this study is to verify the effectiveness of urban design in terms of residents, through case study and the survey of resident's satisfaction on Urban design guidelines. The result of survey of resident's satisfaction on Urban design were above-average satisfaction. And main factors influencing to the resident's satisfaction are the public infrastructure factors, transportation factors, development density factors, and pedestrian environment factors, urban landscape factors. And the total satisfaction was most influenced by the public infrastructure factors among the five factors. To improve the effectiveness of urban design, it is necessary to build specific planning and guidelines to the general.

• International Commerce and Information Review
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• v.9 no.2
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• pp.65-86
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• 2007

This paper reviews the properties and application methods of widely used types of risk measures, identifies the rationale and business-side effects of hedging, derives the theoretical formula of optimal hedging ratio, and analyzes the various functional aspects of VaR(Value-at-risk) as a risk measure and a hedging tool. Especially this paper focuses on the characteristics of VaR compared with other risk measures in terms of their own principal determinants and identifies its stronger aspects in the dimension of hedging strategy tools. As well, this paper provides the detailed processes deriving the optimal hedge ratios based on the distributional parameters and risk factors. In addition, this paper presents the detailed and substantial processes of estimating the minimum variance hedge ratio and minimum-VaR hedge ratio using the actual data and shows that the minimum variance hedge ratio proves helpful for many cases although it is not appropriate for the non-linear portfolio including the option contracts. We demonstrate the trade-off relationship between the minimum variance hedge strategy and the minimum-VaR hedge strategy in their hedging costs and performances through calculation of the respective VaRs and variances of unhedged and hedged portfolios and the optimal hedge ratio and hedging effectiveness values for the given long position in US Dollar with the short position in Euro.

• Transactions of the Korean Society of Mechanical Engineers B
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• v.25 no.8
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• pp.1122-1130
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• 2001

Film cooling performance from two rows of holes with opposite orientation angles is evaluated in terms of heat flux ratio. The film cooling hole has a fixed inclination angle of 35°and orientation angle of 45°for the downstream row and -45°for the upstream row. Four film cooling hole arrangements including inline and staggered configurations are investigated. The blowing ratio studied was 1.0. Boundary layer temperature distributions are measured to investigate injectant behaviors and mixing characteristics. Detailed distributions of the adiabatic film cooling effectiveness and the heat transfer coefficient are measured using TLC(Thermochromic Liquid Crystal). For the inline configuration, there forms a downwash flow at the downstream hole exit to make the injectant well attach to the wall, which gives high adiabatic film cooling effectiveness and heat transfer coefficient. The evaluation of heat flux ratio shows that the inline configuration gives better film cooling performance with the help of the downwash flow at the downstream hole exits.