• ETRI Journal
• /
• 제33권6호
• /
• pp.957-960
• /
• 2011

We present a fair and efficient solution for selfish readers with the Nash bargaining solution (NBS) to mitigate the effects of RFID frequency interference. We compare the NBS with a solution derived by the max log-sum scheme that maximizes total utility and show that for selfish and rational readers, the NBS brings success in bargaining on resource allocation between readers unlike the max log-sum scheme, although the NBS has less total payoff compared to the max log-sum scheme.

• 대한가정학회지
• /
• 제34권5호
• /
• pp.293-306
• /
• 1996

An educational program for parent caregiving families has been developed with a view to help mitigate burdens of those who provide caring services for their aged parents and to meet the needs of both the caregiving middle-aged daughter-in-law and the parent. The program has been applied to a small group of people who at least one living aged parent. The effectiveness of the program has been evaluated by taking pre- and posttests. The result of the tests strongly suggest that the program has been effective in improving participatns' knowledge on aging process, confict solving and relationship with parent.

• Journal of Information Processing Systems
• /
• 제6권4호
• /
• pp.563-574
• /
• 2010

The growing number of web applications in the global economy has made it critically important to develop secure and reliable software to support the economy's increasing dependence on web-based systems. We propose an intercepting filter approach to mitigate the risk of injection flaw exploitation- one of the most dangerous methods of attacking web applications. The proposed approach can be implemented in Java or .NET environments following the intercepting filter design pattern. This paper provides examples to illustrate the proposed approach.

• Communications for Statistical Applications and Methods
• /
• 제23권6호
• /
• pp.587-592
• /
• 2016

It is a long-standing issue to correctly determine the number of long-run relationships among time series processes. We revisit nonparametric test for cointegration rank and propose bootstrap refinements. Consistent with model-free nature of the tests, we make use of Cholesky factor bootstrap methods, which require weak conditions for data generating processes. Simulation studies show that the original Breitung's test have difficulty in obtaining the correct size due to dependence in cointegrated errors. Our proposed bootstrapped tests considerably mitigate size distortions and represent a complementary approach to other bootstrap refinements, including sieve methods.

• Soft Computing and Machine Intelligence
• /
• 제1권1호
• /
• pp.24-30
• /
• 2021

The accelerated growth of the internet and the enormous amount of data availability has become the primary reason for machine learning applications for data analysis and, more specifically, pattern recognition and decision making. In this paper, we focused on the crowdfunding site Kickstarter and collected the comments in order to apply neural networks to classify the projects based on the sentiments of backers. The power of customer reviews and sentiment analysis has motivated us to apply this technique in crowdfunding to find timely indications and identify suspicious activities and mitigate the risk of money loss.

• Journal of Electrical Engineering and Technology
• /
• 제10권1호
• /
• pp.379-387
• /
• 2015

A custom power device provides an integrated solution to the present problems that are faced by the utilities and power distribution. In this paper, a new controller is designed which is connected to a multiconverter unified power quality conditioner (MC-UPQC) for improving the power quality issues adopted modified synchronous reference frame (MSRF) theory with Fuzzy logic control (FLC) technique. This newly designed controller is connected to a source in order to compensate voltage and current in two feeders. The expanded concept of UPQC is multi converter-UPQC; this system has a two-series voltage source inverter and one shunt voltage source inverter connected back to back. This configuration will helps mitigate any type of voltage / current fluctuations and power factor correction in power distribution network to improve power quality issues. In the proposed system the power can be conveyed from one feeder to another in order to mitigate the voltage sag, swell, interruption and transient response of the system. The control strategies of multi converter- UPQC are designed based on the modified synchronous reference frame theory with fuzzy logic controller. The fast dynamics response of dc link capacitor is achieved with the help of Fuzzy logic controller. Different types of fault conditions are taken and simulated for the analysis and the results are compared with the conventional method. The relevant simulation and compensation performance analysis of the proposed multi converter-UPQC with fuzzy logic controller is performed.

• 환경정책연구
• /
• 제10권3호
• /
• pp.3-20
• /
• 2011

태양광 및 풍력단지 건설 운영 사례에서 나타나는 환경 사회적 갈등들을 통하여 그 원인을 분석하고, 국내외의 긍정적인 건설 운영 및 갈등 조정 사례들을 분석하여 갈등의 최소화 방안 및 제도적 보완책을 모색하였다. 국내 태양광 및 풍력단지의 건설 운영 사례에서 나타나는 갈등은 지역 환경 훼손, 발전 시설에 따른 직접적인 피해, 발전 사업에 따른 지역 이익의 부재, 환경규제 및 관리상의 문제가 주된 원인이며, 이의 해결을 위한 방안으로 발전 사업 지침 개선 및 강화, 주민 수용성 확보, 사업설명회 규정 강화, 이해당사자의 참여 확대 방안 및 대안 입지와 해상풍력의 조속한 시행을 제시하였다. 이들 방법을 통해 신재생에너지기본계획 중 태양광 및 풍력에너지의 목표, 환경의 보호 및 보전 그리고 주민수용성 향상을 달성할 수 있다.

• 환경영향평가
• /
• 제19권3호
• /
• pp.335-345
• /
• 2010

This paper assessed environmental impacts of marine sand mining on coastal areas and Exclusive Economic Zones (EEZs) of Korea, and diagnosed problems of the related assessment statements for suggesting key assessment items (scoping) and system improvement. To mitigate conflicts and environmental impacts caused by large-scale, concentrated sand mining, we suggest it is critical to promote sustainable and eco-friendly utilization of marine resources while listening opinions from various stakeholders and analyzing alternative plans. Especially, it should be mandatory as a scoping item to provide verifiable data on the amount of sand, potential and accumulative impacts by mining, and key assessment items (e.g. erosion and sedimentation by submarine topography, benthic change, spreading of suspended solids, water pollution, grain-size change, and impact on fisheries resources). We also suggest that postassessment and monitoring should be improved to enable tracking of environmental impacts caused by sand mining through seasonal monitoring together with intermittent short-term surveys. In addition, effective measures to mitigate the impacts is also essential. As repeated sand mining at large-scale can damage marine ecosystems by long-term accumulated impacts, we suggest that assessment systems and regulatory policies should be developed and established, especially for ensuring reliability of assessment and review on selected major sandmining projects.

• 한국산학기술학회논문지
• /
• 제21권11호
• /
• pp.804-813
• /
• 2020

기존의 국내 무부채 기업에 관한 연구는 부채 그룹과 대비되는 의미에서의 무부채 단일 그룹의 동질적인 그룹 특성 연구에 중점을 두었다고 볼 수 있다. 본 연구는 국내 무부채 기업군을 단 변량 분석과 다 변량 로짓 회귀분석을 사용하여 배당금을 지급하는 그룹과 지급하지 않는 그룹으로 나누어 실증 분석한 결과 국내 기업들이 무부채 전략을 선택하는 동기에 있어서 크게 두 종류의 기업군으로 분류 될 수 있음을 발견했다. 첫 번째 기업군은 주로 기업 크기가 작은 신생 기업들로서 금융시장에서 부채를 조달하는데 어려움이 있고 이런 재정적인 어려움 때문에 무부채를 선택하는 기업들이다. 이런 종류의 기업들은 배당금을 지급할 수 있을만한 유동성이 없다. 두 번째 그룹은 비교적 크고 성숙한 기업들로서 현재 부채 조달에 어려움은 없지만 미래 성장에 필요한 투자 자금 확보를 대비해서 현재의 부채 사용을 억제하여 필요한 시점의 원활한 부채 자금 조달을 위한 재정적 유연성을 갖고자 무부채 전략을 선택하는 것으로 보인다. 재정적으로는 비교적 안정되어 있고 배당을 지급하지 않는 그룹보다 수익률과 영업 현금흐름에서 더 높지만 성장가능성은 상대적으로 더 낮다. 요약하자면 무부채 그룹은 단일 공통된 특성의 그룹이 아니다.

• 한국압력기기공학회 논문집
• /
• 제9권1호
• /
• pp.15-19
• /
• 2013

The auxiliary feedwater is an important to remove the heat from the reactor core when the main feedwater system is unavailable. In most initiating events in Probabilistic Safety Assessment(PSA), the operaton of this system is required to mitigate the accidents. For one of domestic nuclear power plants, a design change of a turbine-driven auxiliary feedwater pump(TD-AFWP), pipe, and valves in the auxiliary system is implemented due to the aging related deterioration by long time operation. This change includes the replacement of the TD-AFWP, the relocation of some valves for improving the system availability, a new cross-tie line, and the installation of manual valves for maintenance. The design modification affects the PSA because the system is critical to mitigate the accidents. In this paper, the safety effect of the change of the auxiliary feedwater system is assessed with regard to the PSA view point. The results demonstrate that this change can supply the auxiliary feedwater from the TD-AFWP in the accident with the motor-driven auxiliary feedwater pump(MD-AFWP) unavailable due to test or maintenance. In addition, the change of MOV's normal position from "close" to "open" can deliver the water to steam generator in the loss of offsite power(LOOP) event. Therefore, it is confirmed that the design change of the auxiliary feedwater system reduces the total core damage frequency(CDF).