• 대한전기학회:학술대회논문집
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• 대한전기학회 2009년도 제40회 하계학술대회
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• pp.462_463
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• 2009

When introducing the existing distribution system, load and power are mixed for wind power generation to be operated unlike the distribution system. Accordingly, if large scale development facilities such as a wind farm is adopted in concentration, the problems need to be examined and analyzed and security measures need to be taken not to out of voltage range.

• 한국정보과학회:학술대회논문집
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• 한국정보과학회 2004년도 봄 학술발표논문집 Vol.31 No.1 (A)
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• pp.451-453
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• 2004

S/W 시스템의 보안속성에 대한 QoS 요구조건을 적용하기 위해서는 침입에 대한 객관적 모델 및 정량적 분석이 가능해야 한다. 즉, 특정 침입에 대응하는 보안기능의 존재여부를 중심으로 시스템의 성능을 평가하는 정성적 방식이 아닌 보안시스템의 분석적 모델에 의해 침입 형태별로 어떤 성능을 나타내는지를 수치적으로 제시할 필요가 있다. 본 논문에서는 Intrusion Tolerant System(이하 ITS라 함) 모델링에 대한 관련연구를 바탕으로 DoS 공격 등 침입양태별 모델링 사례를 시뮬레이션을 통해 분석하고 모델링의 방향을 제시하고자 한다.

• 한국전자거래학회지
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• 제9권1호
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• pp.285-301
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• 2004

현재 지원되고 있는 클라이언트/서버 방식의 민원 서비스의 한계를 극복하여 인터넷으로 민원 서비스를 하기 위해서는 행정 내부망과 인터넷 망의 연계에 따른 보안문제와 공인 인증과 정부 인증 등을 통한 본인 확인 및 스마트 카드를 통한 전자지불 및 현금 등을 통한 지불 기능이 지원 되어야 한다. 특히 이를 키오스크를 통하여 지원하기 위해서는, 인터넷을 통한 민원서비스를 위한 키오스크는 관청 외부 설치를 전제로 하기 때문에, 보안이 보다 중요한 문제로 등장한다. 이러한 제반 문제점을 해결할 수 있는 민원 서비스시스템을 설계함에 있어 실질적인 민원 처리를 담당하는 민원처리 시스템인 시군구 종합행정정보시스템의 프론트 서버로서의 중계서버와 키오스크 제어를 담당하는 웹서버를 두어 중계서버와 웹서버를 연계하고 웹서버와 중계서버 사이에 인증프로세스를 거치게 함으로 민원처리 시스템과 키오스크를 직접 연계함으로 발생되는 보안 문제를 해결할 수 있다. 민원 서비스를 위한 인증 및 전자지불의 기능 지원을 위하여 본인 확인은 지문인식을, 전자지불은 지불 게이트웨이를 전제로 설계한다. 이를 설계함에 있어서 개발의 초기 단계에서 위험을 줄이고 재작업에 따른 비용을 절감할 수 있을 뿐만 아니라 높은 품질의 시스템을 효과적으로 개발할 수 있는 키오스크 기반 웹 민원서비스 시스템을 아키텍쳐 수준에서 그 모델을 제시한다.

• International Journal of Computer Science & Network Security
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• 제21권3호
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• pp.245-256
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• 2021

Poor logistical infrastructure and agri-food supply chain management leads to significant food waste in logistic system. The concept of the sustainable value added agri-food chains requires defined approach to the analysis of the existing situation, possible improving strategies and also assessment of these changes impact on further development. The purpose of research is to provide scientific substantiation of theoretical and methodological principles and develop practical recommendations for the improvement of the agri-food logistics distribution system. A case study methodology is used in this article. The research framework is based on 4 steps: Value Stream Mapping (VSM), Gap and Process Analysis, Validation and Improvement Areas Definition and Imitation Modelling. This paper presents the appropriateness of LEAN logistics tools using, in particular, Value Stream Mapping (VSM) for minimizing logistic losses and Simulation Modeling of possible logistics distribution system improvement results. The algorithm of VSM analysis of the agri-food supply chain, which involves its optimization by implementing the principles of sustainable development at each stage, is proposed. The methodical approach to the analysis of possible ways for optimizing the operation of the logistics system of the agri-food distribution is developed. It involves the application of Value Stream Mapping, i.e. designing of stream maps of the creation of the added value in the agri-food supply chain for the current and future state based on the minimization of logistic losses. Simulation modeling of the investment project on time optimization in the agri-food supply chain and economic effect of proposed improvements in logistics product distribution system functioning at the level of the investigated agricultural enterprise has been determined. Improvement of logistics planning and coordination of operations in the supply chain and the innovative pre-cooling system proposed to be introduced have a 3-year payback period and almost 75-80% probability. Based on the conducted VSM analysis of losses in the agri-food supply chain, there have been determined the main points, where it is advisable to conduct optimization changes for the achievement of positive results and the significant economic effect from the proposed measures has been confirmed. In further studies, it is recommended to focus on identifying the synergistic effect of the agri-food supply chain optimization on the basis of sustainable development.

• 전기학회논문지
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• 제66권4호
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• pp.613-620
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• 2017

The power grid has been changed to a smart grid system to satisfy the growing need for power grid complexity, demand, reliability, security, and efficiency with a combination of existing power and ICT technology. This study analyzes the research trends in smart grid technology in the period since the introduction of the smart grid system and compares it with industrial trends to grasp the progress and characteristics of Smart Grid technology and look for ways to innovate the technology. To do this, we analyze the research trends using dynamic topic modeling, which is capable of time-series research topic analysis. Next, we compare the results of research trends with industrial trends analyzed by Gartner's experts to demonstrate that smart grid research is evolving to the level of industrialization. The results of this study are quantitative analysis through data mining, and it is expected that it will be used in many fields such as companies that want to participate in industry and government agencies that need to establish policies by showing more objective analysis results.

• 디지털콘텐츠학회 논문지
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• 제16권1호
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• pp.1-12
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• 2015

본 논문에서는 새로운 신뢰 망 운용에 가상화 기술을 적용하기 위하여 기존 가상화 기술 연구동향 및 문제점을 분석하고, 가장 적합한 가상화 기술을 제시하고자 한다. 가상화 기술을 통하여 자원의 활용률을 높이고 관리비용을 절감할 수 있는 장점이 있다. 한편 보안 측면에서는 가상화를 통한 보안의 장점도 있는 반면에, 가상화의 도입으로 인한 새로운 취약성이 발생하여 이 문제에 대한 분석 및 대책이 필요하다. 따라서 가상화 시스템의 보안 위협 요소들을 도출하고, 가상화 보안 정책에 대하여 분석하고 살펴본다.

• 융합보안논문지
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• 제4권3호
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• pp.91-99
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• 2004

학생의 건전한 심신의 발달을 도모하고 국민의 식생활 개선과 학부모의 도시락 만들기 고충을 덜어드리기 위하여 실시하고 있는 학교 급식이 초등학교에서 고등학교까지 실시되고 있다. 이에 본 연구는 급식에 종사하는 사용자의 과중한 업무를 간단하고 신속하게 처리하며, 재사용성과 사용의 용이성, 효율성을 고려한 설계를 하므로서 인지과학에 기반한 시스템을 구현하였다.

• Journal of Electrical Engineering and Technology
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• 제4권3호
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• pp.337-345
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• 2009

Deregulation in power industry has made the reactive power ancillary service management a critical task to power system operators from both technical and economic perspectives. Reactive power management in power systems is a complex combinatorial optimization problem involving nonlinear functions with multiple local minima and nonlinear constraints. This paper proposes a practical market-based reactive power ancillary service management scheme to tackle the challenge. In this paper a new model for voltage security and reactive power management is presented. The proposed model minimizes reactive support cost as an economic aspect and insures the voltage security as a technical constraint. For modeling validation study, two optimization algorithm, a genetic algorithm (GA) and particle swarm optimization (PSO) method are used to solve the problem of optimum allocation of reactive power in power systems under open market environment and the results are compared. As a case study, the IEEE-30 bus power system is used. Results show that the algorithm is well competent for optimal allocation of reactive power under practical constraints and price based conditions.

• 한국시뮬레이션학회논문지
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• 제13권3호
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• pp.21-29
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• 2004

The major objective of this paper is to analyze network vulnerabilities using the SIMVA (SIMualtion-based Vulnerability Analyzer). SIMVA is capable of monitor network status and analyze vulnerabilities automatically. To do this, we have employed the advanced modeling and simulation concepts such as SES/MB (System Entity Structure / Model Base) framework, DEVS (Discrete Event System Specification) formalism, and experimental frame for developing network security models and simulation-based analysis of vulnerability. SIMVA can analyze static vulnerability as well as dynamic vulnerability consistently and quantitatively. In this paper, we verified and tested the capability of application of SIMVA by slammer worm attack scenario.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2004년도 ICEIC The International Conference on Electronics Informations and Communications
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• pp.269-273
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• 2004

This paper presents a comparative performance analysis of a network accelerator model based on M/M/l queuing system. It assumes the Poisson distribution as its input traffic load. The decoding delay is employed as a performance analysis measure. Simulation results based on the proposed model show only $15\%$ differences with respect to actual measurements on field traffic for BCM5820 accelerator device. The performance analysis model provides with reasonable hardware structure of network servers, and can be used to span design spaces statistically.