• 대한전기학회:학술대회논문집
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• 대한전기학회 1998년도 하계학술대회 논문집 B
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• pp.410-413
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• 1998

A passive approach for enhancing fault detection and isolation performance of multiple observer based fault detection isolation schemes(FDIS) is proposed. The FDIS has a hierarchical framework to perform detection and isolation of faults of interest, and diagnosis of process faults. The decision unit comprises of a rule base and fuzzy inference engine and removes some difficulties of conventional decision unit which includes crisp logic and threshold values. Emphasis is placed on the design and evaluation methods of the diagnostic rule base. The suggested scheme is applied for the FDIS design for a DC motor driven centrifugal pump system.

• 대한전기학회논문지:전력기술부문A
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• 제48권4호
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• pp.444-451
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• 1999

A diagnostic rule-base design method for enhancing fault detection and isolation performance of multiple obsever based fault detection isolation schemes (FIDS) is presented. The diagnostic rule-base has a hierarchical framework to perform detection and isolation of faults of interest, and diagnosis of process faults. The decision unit comprises a rule base and a fuzzy inference engine and removes some difficulties of conventional decision unit which includes crisp logic with threshold values. Emphasis is placed on the design and evaluation methods of the diagnostic rult-base. The suggested scheme is applied to the FDIS design for a DC motor driven centrifugal pump system.

• The Journal of Asian Finance, Economics and Business
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• 제8권8호
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• pp.487-496
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• 2021

This study examines the environmental performance of firms in Vietnam and its determinants. The contribution of the paper is on both theoretical and empirical aspects. On the theoretical matter, the research proposes a new index measuring environmental management at the firm level, namely the Environmental Management Index with a clear illustration for the case of Vietnam. On the empirical matter, the study points out and estimates determinants of the corporate environmental performance of Vietnamese firms measured by the newly proposed index. Due to data availability and the impossibility of getting more updated data, the empirical analysis covers only the period from 2004-2009. However, findings are still meaningful because, on the one hand, it provides some evidence for Vietnamese policymakers; on the other hand, with the robust methodology proposed, when more recent data are available, researchers can easily replicate the estimation for more insights. Empirical results show that factors having positive impacts on the environmental performance of Vietnamese firms are profit, capital stock, and interestingly public pressure proxied by the population of the province where the firm is located. Firm ownership does also matter in explaining the corporate environmental performance of Vietnam.

• 통상정보연구
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• 제9권1호
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• pp.403-425
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• 2007

최근 몇 년, 동안 많은 경제전문가와 학자들은 중국의 빠른 경제성장 출현이 세계의 정치와 경제에 중요한 이슈가 될 것이라고 예견해 왔다. 중국의 급속한 성장을 주요한 문제로 받아 들이 면서 급성장에 기여한 요인들과 향후 중국의 경제성장 정책방향에 대하여 주의 깊게 분석하여 연구하기 시작하였다. 이것은 놀라운 일이 아니라는 것을 이 논문을 통해서 이해하게 될 것이다. 경제성장 요인으로는 해외직접투자 (FDI), 수출 그리고 경제개혁이 가장 중요한 요인으로 밝혀졌으며, FDI는 자동차와 운수장비, 전력장치와 가전분야에 집중 되었으며 이는 경제 성장뿐만 아니라 선진국과의 격차 해소에 필수적인 기술집약적인 분야에 집중 투자 함으로서 세계 수출입 시장으로의 원동력이 되고 수출입의 증가로 인해 많은 외환의 비축을 촉진시키게 되었다. 본고에서는 다음의 내용을 소재로 중국경제 정책의 방향을 중점 연구하였다. 1. 중국의 경제성장과 발전의 중요한원동력이 무엇이며 향후에도 과거와 같은 경제성장 이 지속 될 것이며 또 얼마동안 지속될 것이냐? 2. 중국의 경제 성장이 원자재의 품귀와 가격상승으로 원자재 시장을 교란시켜 왔는데 과잉 외환보유를 해소하기 위해 정부 주도의 원유 및 전략물자와 기술도입의 확대 등. 3. 중국 경제에서 과다 외환보유로 인한 리스크 증가에도 불구하고 민간부분의 자율외환시장 기능 확대와 향후에도 정부주도형 외환관리와 경제정책 시스템을 유지 등.

• Journal of Korea Trade
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• 제27권1호
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• pp.1-18
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• 2023

Purpose - Using a sample of Korean multinational corporations, we examine whether the relationship between tax risk and the implied cost of capital discriminates between the environmental, social, and corporate governance (ESG) of highly rated firms. Design/methodology - Firms with high tax risks have an increased uncertainty of future cash flows. Therefore, as the volatility of future cash flow increases, information asymmetry and the required return increases. Highly rated ESG firms can reduce information asymmetry, thereby weakening the positive relationship between tax risk and cost of capital. We employ the standard deviation of the cash effective tax rate as proxy of tax risk. We utilize the ESG rating data of the Korea Corporate Governance Service (KCGS). We use a PEG model, MPEG model, and GM model to measure the implied cost of capital. Findings - We find a positive association between the implied cost of capital and tax risk. The positive relationship between tax risk and the implied cost of capital weakens in highly rated ESG firms. Highly rated ESG firms prefer a stable tax position to invest after-tax cash flows into sustainable management. Therefore, the negative effects of tax risk on cost of capital can be reduced. Originality/value - This study provides empirical evidence that ESG activities can mitigate the negative impact of tax risk on the cost of capital for Korean multinational corporations. In a business environment where ESG activities are more important, the empirical results that ESG activities can reduce the corporate risk of Korean FDI companies are expected to provide implications for the ESG activities of multinational corporations.

• The Journal of Asian Finance, Economics and Business
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• 제7권7호
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• pp.565-575
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• 2020

This study aims to analyze the digital performance of Kazakhstan through dynamic analysis of national statistics and international indices as Global Innovation Index and ICT Development Index. The research combines three stages: analysis of digital transformation policies performance, review of ICT industry development, and comparative analysis of the positions of Kazakhstan, Turkey and South Korea as a benchmark in the international indices. This research findings show that despite great efforts of Kazakhstan in digitalization, the ICT industry contribution does not increase, it even falls. The international indices demonstrate that the reason is the weakness of the country in skills, venture capital, and innovation linkages. This leads to low knowledge, technology outputs, and creative outputs. The enablers of digital and overall innovation advancement of economy are identified. According to the international rankings the country has been doing its best in Access and Use areas. Another enablers are good business environment, ease of starting a business, protecting minority investors, and FDI inflows. The findings help to draw recommendations for strategic directions in order to improve the digital performance in Kazakhstan. The main limitation of this study is a lack of dynamic information on positions of Kazakhstan in other international indices related to digitalization.

• 통상정보연구
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• 제15권4호
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• pp.419-436
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• 2013

본 연구는 중국진출 한국인터넷기업을 대상으로 중국내 성과제고를 위한 방안모색을 하고자 중국 소비자의 특성에 따른 성과를 실증분석한 후, 이를 토대로 제고방안을 제시하였다. 연구결과, 인터넷기업에 대한 소비자 인식, 접근성, 거래안정성 등이 성과제고에 유의미한 결과를 가져오는 것으로 나타났다. 이를 통해 중국진출 인터넷기업의 성과제고를 위해서 자사에 대한 브랜드 구축, 서버의 확장, 결제시스템에 대한 안정성 제고, 고객과의 소통을 위한 인적자원의 교육 및 훈련 등이 필요함을 제시하였다. 다만, 본 연구는 대부분 중국의 20대에 집중되어 있어 연구성과를 중국 전체소비자로 확장하기에는 다소 무리가 있다.

• 제어로봇시스템학회논문지
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• 제9권2호
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• pp.99-106
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• 2003

A new reconfigurable model following flight control method based on direct adaptive scheme is presented. Using the timescale separation principle, both the inner-loop and the outer-loop states are controlled simultaneously. For the timescale separation assumption to be satisfied, the inner-loop model dynamics is set to be fast whereas the outer-loop model dynamics is set to be relatively slow. The stability and convergence of the proposed control law is proved by Lyapunov theorem. One of the merits of the proposed reconfigurable controller is that the FDI process and the persistent input excitation are not necessary, which is suitable for the flight control system. To evaluate the reconfiguration performance of the proposed control method, numerical simulation is performed using six degree-of-freedom nonlinear dynamics.

• Advances in robotics research
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• 제2권1호
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• pp.99-112
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• 2018

The main contribution of this work is the design of a field programmable gate array (FPGA) based ARX-Laguerre proportional-integral observation (PIO) system for fault detection and identification (FDI) in a multi-input, multi-output (MIMO) nonlinear uncertain dynamical robot manipulators. An ARX-Laguerre method was used in this study to dynamic modeling the robot manipulator in the presence of uncertainty and disturbance. To address the challenges of robustness, fault detection, isolation, and estimation the proposed FPGA-based PI observer was applied to the ARX-Laguerre robot model. The effectiveness and accuracy of FPGA based ARX-Laguerre PIO was tested by first three degrees of the freedom PUMA robot manipulator, yielding 6.3%, 10.73%, and 4.23%, average performance improvement for three types of faults (e.g., actuator fault, sensor faults, and composite fault), respectively.

• 산업융합연구
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• 제1권1호
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• pp.71-97
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• 2003

In this study, the main goal is conduct an empirical research for MNC's(multinational companies) contingency factors and entry modes. Through examining elements of success and limitations of foreign companies in the domestic market, a resulting purpose can be suggested such as developing attractive foreign investment policy. The results in this study are as below. The results from Logistic Regression Analysis there were indications for preference factors for WOS (Wholly Owned Subsidiary). The factors were 'Strategic Motivation', 'Intelligent Property', and 'Market Latent Purchasing Power'. For JV (Joint Venture) there were preferred factors such as 'Degree of Using Product Factors', 'Differential Products Development Ability', and 'Systematic Incentives'. However, this thesis is limited to identifying clear causal relationship between the 'Performance' of foreign investment enterprise which entered WOS or JV and various factors which were suggested in the contingency factors (independent variables).