• 제어로봇시스템학회:학술대회논문집
• /
• 1997.10a
• /
• pp.215-218
• /
• 1997

A dynamic back-propagation neural network is addressed for adaptive neural control system to approximate non-linear control system rather than static networks. It has the capability to represent the approximation of nonlinear system without mathematical analysis and to carry out the on-line learning algorithm for real time application. The simulated results show fast tracking capability and adaptive response by using dynamic back-propagation neurons.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
• /
• 2004.11a
• /
• pp.1005-1011
• /
• 2004

Squeeze film dampers (SFDs) have been commonly used to effectively enhance the dynamic behavior of the rotating shaft supported by rolling element bearings. However, due to the recent trends of high operating speed, high load capacity and light weight in rotating machinery, it is becoming increasingly important to change the dynamic characteristics of rotating machines in operation so that the excessive vibrations, which may occur particularly when passing through critical speeds or unstable regions, can be avoided. Semi-active type SFDs using magneto-rheological fluid (MR fluid), which responds to an applied magnetic field with a change in rheoloaical behavior, are introduced in order to find its applications to rotating machinery as an effective device attenuating unbalance responses. In this paper, a semi-active SFD using MR fluid is designed, tested and identified by means of linear analysis to investigate the capability of changing its dynamic properties such as damping and stiffness. Furthermore, the proposed device is applied to a rotor system to investigate its potential capability for vibration attenuation: an efficient method for selecting the optimal location of the proposed damper is introduced and control algorithm that could improve the unbalance response properties of a flexible rotor is also proposed.

• Asian Journal of Business Environment
• /
• v.8 no.2
• /
• pp.33-41
• /
• 2018

Purpose - This study aims to examine the determinants of income management of the public servant. Three independent variables are examined such as attitude towards money, financial capability and debt management while the dependent variable is financial wellbeing of public servants. Research design, data, and methodology - Quantitative research is applied in this study, and data are collected by using cross sectional approach. Survey questionnaires are obtained from 270 respondents, which represents 79% response rate. The multiple regressions are used to examine the influence of attitude towards money, financial capability and debt management towards financial wellbeing. Results - The result of the multiple regression indicated positive influences of attitude towards money and financial capability on financial wellbeing. However, debt management found no significant influence on financial wellbeing. Conclusions - Research findings show that people have different attitudes towards money and different trends of expenditure. It is also crucial to be highlighted that employees' attitude and financial capability have a greater influence on overall satisfaction with employees' financial wellbeing. Some would want to show off their luxury items they bought to close friends or relatives and some are very prudent in making expenditures even for necessity items.

• International Commerce and Information Review
• /
• v.13 no.4
• /
• pp.411-433
• /
• 2011

This article investigates the impacts of firms' regulatory compliance and voluntary innovation activities in environmental management on the development of their organizational capabilities and the enhancement of their performance, within the Korean context. The study invokes a structural equation analysis. The results indicate that voluntary innovation activity in response to market pressures makes a significant contribution to the development of firm-specific organizational capability and the enhancement of firms' performance, but regulatory compliance activity does not significantly affect either organizational capability or performance. This capability was also seen to have implications for firm's performance. This article also suggests several policy implications related to the research.

• Journal of Korean Society of Industrial and Systems Engineering
• /
• v.40 no.4
• /
• pp.10-20
• /
• 2017

The proportion of software in the automotive industry is steadily increasing due to the rapid technological development of automobile E/E parts. Because the automotive E/E technology is now on the basis of intelligent automobile and advanced safety automobile technology. The purpose of this study is to investigate the effect of organizational capability (organizational resource capability and management capability), process capability (process capability, customer Requirement management capability), performance dimension (motivation, participation level). In this study, we conducted questionnaires and statistical analysis on engineers (members of the Korea Advanced Automotive Technology Association) who perform research and development activities in the R&D organization of the automotive E/E part in South Korea. ANOVA is applied for the verification of the difference in performance measured by organizational capability, process maturity, and motivation participation level according to company characteristics (level of processing : supply chain configuration, annual sales, total SW development ratio). According to the results of this study, in order to improve the performance of ASPICE or ISO 26262-related consulting project, a different consulting approach strategy considering the characteristics of organization and personnel is needed. In summary, the analysis results for the three main treatment levels are as follows. The difference in organizational capacity, process capability and performance was found to be statistically significant according to supply chain configuration and annual sales, but it was found that the difference of response according to the proportion of total SW was not significant.

• Fire Science and Engineering
• /
• v.30 no.5
• /
• pp.130-136
• /
• 2016

In this study, the budget investment state of the technology classification structure in a fire-fighting and safety research development program and the capability of a fire-fighting safety research program were analyzed between 2007 and 2013 with support from the ministry of public safety. The Ministry of public safety and security's fire safety research funding has shown a gradual increasing tendency. More 80% of the budget was invested in fire safety and disaster response technologies and the fire safety and special disaster prevention response technology of R&D. From the results of analyzing the capacity of fire-fighting safety and rescue safety, it was found to have a moderate level of 3.5 on a 7 point scale basis. To develop the Ministry of Public Safety and Security's fire safety research in the future, the flexibility and reasonableness of the budget/legal/institutional framework and support should be ensured to improve the operational capability of resources. In addition, a proliferation program is necessary for the commercialization and industrialization of research results.

• Proceedings of the Earthquake Engineering Society of Korea Conference
• /
• 1997.10a
• /
• pp.201-208
• /
• 1997

In most seismic codes such as the Uniform Building Code(UBC), the response modification factor(or the force reduction factor)is used to reflect the capability of a structure in dissipating energy through inelastic behavior. The response modification factor is assigned according to structural system type. Ductile systems such as special moment-resisting steel frames are assigned larger values of the response modification factor, and are consequently designed for smaller seismic design forces. Therefore, structural damage may occur during a severe earthquake. To ensure safety of the structures, the suitability of the response modification factor used in aseismic design procedures shall be evaluated. The object of this study is to develop a method for the evaluating of the response modification factor. The validity of the evaluating method has been examined for several cases of different structures and different earthquake excitations.

• Journal of the Korean Society of Clothing and Textiles
• /
• v.27 no.11
• /
• pp.1219-1228
• /
• 2003

This research was conducted to find out what the general globalization trends of Korean fashion enterprises are, and what the factors required the Korean fashion enterprises to improve the global competitiveness under the globalized circumstances are. The data were collected from the survey by questionnaire on Korean leading fashion enterprises and the Directory of Companies Branching out abroad in 2000/2001(Korea Trade-Investment Promotion Agency, 2000). The Results of the research are as follows: first, Korean fashion enterprises expanded evenly worldwide in the sales and distribution functions while relying heavily on Asian countries for manufacturing functions; Secondly, the globalization of Korean leading fashion enterprises was progressed, but still remains at the stage of the sales of manufacturing capability or the sales of low costs products rather than at the stage of manufacturing products of high added-value or the sales of design or marketing capability. Thirdly, the factors for the global competitiveness of the Korean fashion enterprises are related to capability of low cost, quick response, product development, marketing, internationalization and high value added.

• Proceedings of the KIPE Conference
• /
• 2015.07a
• /
• pp.361-362
• /
• 2015

This paper proposes a Direct Power Control (DPC) scheme of improved command tracking capability for Permanent Magnet Synchronous Generator (PMSG) Medium Voltage (MV) Wind Turbines. Benchmarking is performed based on a neutral point clamped three-level back-to-back type voltage source converter. It is introduced to design the DPC modeling and propose DPC scheme of a three-level NPC (3L-NPC) converter. During the fault condition in wind farms, the proposed control scheme directly controls the generated output power to the command value from the hierarchical wind farm controller. The proposed control scheme is compared with conventional control scheme as respect to loss and thermal analysis. The DPC scheme of improved command tracking capability is confirmed through PLECS simulations. Simulation result shows that proposed control scheme achieves a much shorter transient time in a step response of generated output power. The proposed control scheme makes it possible to provide a good dynamic performance for PMSG MV wind turbine to generate a high quality output power under grid fault condition.

• Structural Engineering and Mechanics
• /
• v.34 no.1
• /
• pp.1-14
• /
• 2010

The innovative intelligent fuzzy weighted input estimation method which efficiently and robustly estimates the unknown time-varying input force in on-line is presented in this paper. The algorithm includes the Kalman Filter (KF) and the recursive least square estimator (RLSE), which is weighted by the fuzzy weighting factor proposed based on the fuzzy logic inference system. To directly synthesize the Kalman filter with the estimator, this work presents an efficient robust forgetting zone, which is capable of providing a reasonable compromise between the tracking capability and the flexibility against noises. The capability of this inverse method are demonstrated in the input force estimation cases of the plate structure system. The proposed algorithm is further compared by alternating between the constant and adaptive weighting factors. The results show that this method has the properties of faster convergence in the initial response, better target tracking capability, and more effective noise and measurement bias reduction.