• 대한안전경영과학회지
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• 제17권1호
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• pp.13-19
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• 2015

Continued efforts to build up Safety Management System(SMS) and to improve its efficiency in airports, to which customers have direct access, are taken for granted due to continuous development of the aviation industry in both quantity and quality and rapid growth of air transportation market. This thesis proposed efficient operation methods of SMS for domestic airport organizations including Incheon International Airport(IIA), the largest airport in South Korea, aiming at strengthening aviation safety from the perspective of airport operators who play a pivotal role in service provider SMS. Those are consolidation of the existing safety management organizations and various improvements to promote voluntary incident reporting system. To draw a proposal for the improvements, conducted a research on domestic safety management status, carried out an analysis on operating conditions and did a research on ICAO regulations, domestic legal system as well as statistics data. Relevant studies and researches were also gathered and analyzed. A search for further improvements can also help increase operational efficiency and promoting a higher-level of safety awareness among operators can establish mature safety culture at airports.

• 농촌지도와개발
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• 제22권1호
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• pp.15-24
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• 2015

Responsible tourism attracting worldwide attention has supported local economy and community development as a type of alternative tourism. This study explored the perception toward fairness in tourism and operation status of responsible tour operators in South Korea by conducting in-depth interviews with probe questions. Ten responsible tour operators were interviewed with a semi-structured interview questionnaire for one upto two hours. From the interview data, six themes were identified as difficulties of responsible tour operators: lack of manpower, advertising and promotion, absence of marketing strategy, regulation, lack of budget and lack of recognition of responsible tourism. As government support identified through the interviews, there are the followings seven themes: a low entry barrier market, investment in human resources, resource utilization, community-based policies, connection with local produce, community support and connection system of responsible travel agencies with intermediate support organizations at a local level, The findings of this paper implicate the underlying subject of responsible tourism from a tour operators' perspective.

• Journal of Electrical Engineering and Technology
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• 제10권3호
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• pp.1335-1341
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• 2015

The utilization of electric vehicles has been suggested to support the frequency regulation of power system. Assuming that an intermediate aggregator exists, this study suggests a decentralized vehicle-to-grid operation scheme in which each vehicle-to-grid aggregator can behave independently of the power system operator. To implement this type of decentralized operation, this study adopts a price-based operation that has been proposed by many researches as an alternative operation scheme for the power system. In this environment, each vehicle-to-grid aggregator can determine its participation in vehicle-to-grid service in consideration of its residual energy of aggregated system and real-time market price. Consequently, the main purpose of this study is to verify whether or not the vehicle-to-grid power can effectively support the current frequency regulation function within the price-based operation scheme. Specifically, a frequency regulation method is proposed based on the real-time price signal, and a feedback controller for battery management is designed for decentralized vehicle-to-grid operation.

• Journal of Electrical Engineering and Technology
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• 제10권3호
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• pp.820-831
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• 2015

In a deregulated electricity market, congestion of the transmission lines is a major problem the independent system operator (ISO) would face. Rescheduling of generators is one of the most practiced techniques to alleviate the congestion. However, not all generators in the system operate deterministically and independently, especially wind power generators (WTGs). Therefore, a novel optimal rescheduling model for congestion management that accounts for the uncertain and correlated power sources and loads is proposed. A probabilistic power flow (PPF) model based on 2m+1 point estimate method (PEM) is used to simulate the performance of uncertain and correlated input random variables. In addition, the impact of direct electricity purchase contracts on the congestion management has also been studied. This paper uses artificial bee colony (ABC) algorithm to solve the complex optimization problem. The proposed algorithm is tested on modified IEEE 30-bus system and IEEE 57-bus system to demonstrate the impacts of the uncertainties and correlations of the input random variables and the direct electricity purchase contracts on the congestion management. Both pool and nodal pricing model are also discussed.

• 유통과학연구
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• 제14권12호
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• pp.5-21
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• 2016

Purpose - This study aims to clarify the meanings of small enterprise and modify criteria for explaining its range. Prioritizing the number of full time workers first and the sales next are proper as a new concept and range. Research design, data, and methodology - In research, 'small company' is a basic concept because the range of its standard is categorized as a 'small company' in the policy system of small & medium business. This study focuses on the solutions with ① evaluation on sales, ② standard for excluded ones ③ regulation for excluded business types in 'Act on Protection and Support for Small Enterprise'. Results - Clarifying the range of standard with maintaining the title is advisable. The scope should resist the current criteria or adopt a new standard which contains not only full time workers but also the sales. The new one may raise the policies' effectiveness because it can sort the 1% people of small enterprises. Conclusions - However, there should be a preventive system for sorting out the non-eligible ones not conformed to the CAP for small company. Therefore, it is desirable to prepare the system with 'unsuitable ones list' or regulate large income·inappropriate business types in 'Act on protection and support for small enterprise'.

• Journal of Electrical Engineering and Technology
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• 제5권2호
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• pp.209-219
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• 2010

In this paper, a novel dynamic available transfer capability (DATC) has been computed for real time applications using three different intelligent techniques viz. i) back propagation algorithm (BPA), ii) radial basis function (RBF), and iii) adaptive neuro fuzzy inference system (ANFIS) for the first time. The conventional method of DATC is tedious and time consuming. DATC is concerned with calculating the maximum increase in point to point transfer such that the transient response remains stable and viable. The ATC information is to be continuously updated in real time and made available to market participants through an internet based Open Access Same time Information System (OASIS). The independent system operator (ISO) evaluates the transaction in real time on the basis of DATC information. The dynamic contingency screening method [1] has been utilized and critical contingencies are selected for the computation of DATC using the energy function based potential energy boundary surface (PEBS) method. The PEBS based DATC has been utilized to generate patterns for the intelligent techniques. The three different intelligent methods are tested on New England 68-bus 16 machine and 39-bus 10 machine systems and results are compared with the conventional PEBS method.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제6권12호
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• pp.3133-3151
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• 2012

The optimal price strategy selection of two bounded rational cognitive mobile virtual network operators (MVNOs) in a duopoly spectrum sharing market is investigated. The bounded rational operators dynamically compete to sell the leased spectrum to secondary users in order to maximize their profits. Meanwhile, the secondary users' heterogeneous preferences to rate and price are taken into consideration. The evolutionary game theory (EGT) is employed to model the dynamic price strategy selection of the MVNOs taking into account the response of the secondary users. The behavior dynamics and the evolutionary stable strategy (ESS) of the operators are derived via replicated dynamics. Furthermore, a reward and punishment mechanism is developed to optimize the performance of the operators. Numerical results show that the proposed evolutionary algorithm is convergent to the ESS, and the incentive mechanism increases the profits of the operators. It may provide some insight about the optimal price strategy selection for MVNOs in the next generation cognitive wireless networks.

• The Journal of Asian Finance, Economics and Business
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• 제8권5호
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• pp.253-263
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• 2021

This research aims to increase the tourism destination competitiveness for the city of Malang. This research uses the extended criteria of Resource-based View (RBV): VRIOLU (Valuable, Rare, Inimitable, Organization, Large Market, Unmet Need) to analyze tourism destination competitiveness for the city of Malang. A qualitative approach with a case study research design is adopted in this research. Data was collected using data triangulation, such as an in-depth interview with the informants, direct observation in the form of field notes, and picture documentation. The data was analyzed manually by the researchers using thematic analysis. In this research, VRIOLU, the extended criteria of RBV is proven that it can be used as a tool to analyze tourism destination competitiveness by giving the researchers a framework to get the answers from the informants to achieve the research aim. Suggestions to improve the tourism destination competitiveness for the city of Malang include: (1) Actively promoting the added value that can be given by the city of Malang to the visitors; (2) Forming a tourism board to manage the city of Malang as a tourism destination in a holistic manner; (3) Creating synergistic promotion between the stakeholders of tourism operator and governments.

• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2014년도 춘계학술대회
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• pp.261-263
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• 2014

이제 국내에서 IT서비스는 웹을 통하지 않고서는 불가능할 정도까지 일반화 되었다. 반면, 이러한 웹에 대한 보안 문제가 이슈가 되면서 웹서버에 대한 안전한 코팅이 2012년부터 안전행정부를 통하여 강제적인 지시사항으로까지 된 상황이다. 기존에는 이러한 요구를 해결하고자 보안 장비인 웹 방화벽이 국내 시장에서 많은 탄력을 받으며 판매가 되어 왔다. 본 연구에서는 이러한 웹 방화벽의 보안 정책을 운영자가 능동적으로 설정할 수 있는 방안을 제시하여, 보다 안전한 웹서비스를 가능하게 하는 방안을 제시하고자 한다.

• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2021년도 추계학술대회
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• pp.524-526
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• 2021

최근에 비디오 월 컨트롤러 시장이 빠르게 성장하면서 지금까지는 크게 이슈화 되지 않았던 문제들이 표면화 되고 있는데, 비디오 월 컨트롤러에서 블랙 스크린이 발생하는 현상도 그 중 하나일 것이다. 블랙 스크린은 비디오 월 컨트롤러의 멀티 스크린에 정상적인 영상이 아닌 블랙 스크린이 표출되는 현상이다. 블랙 스크린의 발생을 인지하고 해결하기 위해서는 인간의 개입이 불가피 하지만 운영자가 24시간 멀티 스크린을 모니터링 하는 것은 사실상 불가능하다. 따라서 본 논문에서는 비디오 월 컨트롤러에서 블랙 스크린이 발생하는 것을 자동으로 감지하는 모델을 제안한다. 블랙 스크린 감지 모델은 이미지 분류에 널리 활용되고 있는 컨볼루션 신경망으로 블랙 스크린의 발생 여부를 감지한다.