• 한국통신학회논문지
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• 제29권12C호
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• pp.1707-1721
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• 2004

본 논문에서는 네트워크 차원의 종합적인 보안관리가 가능한 침입탐지시스템의 분산 통신모델을 제안하고 보안노드와 분산 시스템 레벨에서 각각 모델링하고 시뮬레이터를 설계하고 구현한다. 노드 레벨에서는 하드웨어기반 침입탐지를 수행하는 기가비트 보안 노드의 구조분석을 기반으로 경보 메시지의 전달 성능을 평가한다. 분산 시스템 레벨에서는 보안정책을 기반으로 네트워크 수준에서 분산 침입방지시스템의 컴포넌트 사이에 전달되는 탐지 및 경보 정보의 전달 성능을 모의실험을 통하여 성능평가를 수행한다. 제안된 모델에서 통신 메커니즘의 결정요인들을 적용하여 성능 평가를 수행하고 시스템의 정량적인 이해를 하기 위하여 결과를 제시한다.

• 산업경영시스템학회지
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• 제25권2호
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• pp.11-18
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• 2002

Psychological and physiological effects of the simulator sickness could be important bias factors for the sensibility evaluation. The purpose of the present study was to clear the differences of psychophysiological responses due to individual sensitivity of simulator sickness. The present experiment tried to investigate the simulator sickness objectively by observing the change of the simulator sickness for the different level of sickness groups (sick and non_sick group). The subjective evaluations using Simulator Sickness Questionnaire (SSQ) and physiological responses were measured every five minutes when they were driving as 60km/h in the driving graphic simulator. Response level of the subjective evaluation for all subjects on the simulator sickness was linearly increased with time for every item, and the response level of sick group was bigger than that of non_sick group. When the analysis on central nervous system was done separately on the sick and the non_sick group, there was significant difference in the parameter $\theta$/total at Fz and Cz. Although the analysis on autonomic nervous system for all subjects showed the increased activation of sympathetic nervous system, there was no significant difference between the sick and non_sick group. In summary, it is necessary to select the subjects who feel less simulator sickness in order to be accurate sensibility evaluation. The parameters to distinguish between the sick and non_sick group were the change on $\theta$/total and subjective evaluation using SSQ.

• 컴퓨터교육학회논문지
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• 제6권3호
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• pp.197-205
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• 2003

효과적인 교수활동을 위해서는 교수자가 학습자의 현 수준을 정확히 파악해야 한다. 학습자의 수준 파악을 위해서는 일반적으로 진단평가를 활용한다. 그러나 시간상의 제약으로 인해 교수자가 필요로 하는 모든 경우에 학습자의 수준 파악을 위한 진단평가를 실시하기는 어렵다. 이에 본 논문에서는 교수자 교수방법의 효율화를 위한 웹 기반 진단평가시스템을 제안한다. 제안하는 시스템에서는 교수자가 웹을 통해 원하는 평가문제를 수시로 입력하는 것이 가능하며 학습자는 자신의 수강과목의 일정에 따라 시공간 제약 없이 개별적으로 온라인 진단평가를 수행할 수 있다. 또한 제안하는 시스템에서는 각 학습자의 평가결과를 자동으로 처리하여 교수자가 학습자의 현재 수준을 분석하고 교육 수준을 결정할 수 있는 다양한 통계 자료를 제시해준다.

• 한국정보시스템학회지:정보시스템연구
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• 제13권2호
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• pp.225-240
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• 2004

The most critical problem of MIS evaluation is the lack of the systematic framework to cover various factors and viewpoints. To solve this problem, this study takes the multi-level and contingent approach to performance evaluation, composed of three levels: evaluating the contribution of MIS to an organization [strategy level]; evaluating the activities of MIS department or MIS function as an organizational sub-function through the overall MIS lifecycle [function level]; and evaluating the quality or productivity of the application systems as MIS outputs [system level]. Ideal MIS evaluation should include all three levels of the hierarchy with balanced importance. However, MIS evaluationcanbedividedintothreetypes,suchasstrategy-oriented, function-oriented and system-oriented evaluation, depending on the focus and emphasis of evaluation. The usage pattern of each evaluation type is analyzed according to contingent variables of MIS evaluation such as MIS maturity, information intensity and firm size, and top management's intent. It is also found that the firms of higher MIS maturity and top management's intent use the strategy-oriented evaluation type, and the firms with strategy-oriented evaluation type show a higher MIS performance. Further, MIS maturity and top management's intent show contingent effects between evaluation type and MIS performance. Some managerial implications can be drawn based on the results of the study. First, strategy-oriented evaluation of MIS is more important as many firms more often use information technology as a strategic weapon. Second, MIS performance varies with evaluation type. Therefore, the design of MIS evaluation framework should be done carefully in the strategic and managerial contexts. Third, firms are recommend to use a different evaluation type according to organizational characteristics such as MIS maturity and information intensity.

• Journal of Electrical Engineering and Technology
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• 제12권2호
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• pp.621-631
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• 2017

In this paper, we study the various impacts of connecting distributed generation (DG) to the distribution network. The comprehensive evaluation index system (CEIS) of four hierarchies is established, considering economy, reliability and voltage quality, and the calculation methods of different indexes are presented. This paper puts forward an improved triangular fuzzy number analytic hierarchy process (ITFNAHP) to weight the second level indexes (SLI) and the third level indexes (TLI), and calculates the variation coefficient to weight the fourth level indexes (FLI). We calculate the comprehensive weight coefficients based on the weight coefficients of the SLI, TLI and FLI, and then calculate the comprehensive evaluation of satisfaction (CES) of different access schemes. On the basis of the IEEE 33-bus example system, simulations of the calculation methods and the comprehensive evaluation method are carried out under different DG access schemes according to the same total investment cost and the same permeability, respectively, and the simulation results are analyzed and discussed.

• 한국군사과학기술학회지
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• 제14권1호
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• pp.84-91
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• 2011

The Systems Interoperability Test and Evaluation System(SITES) is an T&E support tool for both information system and weapon system. The SITES was developed by reference to the Level of Information Systems Interoperability(LISI) in US. We use the tool via MND Broad convergence Network(BCN) in order to assess information system's interoperability. Nowadays, there are many ongoing researches on expanding assessment capability into weapon systems. As part of those research topics, this paper analyze the characteristics of tactical data-link messages which is the way to exchange the information among the weapon systems, and reflect that characteristics in interoperability level assessment.

• 기술혁신학회지
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• 제12권1호
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• pp.137-164
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• 2009

본 연구는 출연(연) 성과향상을 위한 기관평가시스템의 발전방안 논의의 일환으로 출연(연) 기관평가시스템이 연구기관 구성원들의 평가결과에 대한 수용성 정도에 미치는 영향과 이로 인한 연구기관 성과에 미치는 영향을 살펴보았다. 분석결과 경제 인문사회연구회의 출연(연) 기관평가시스템은 연구기관 성과에 유의적인 정(+)의 영향을 미쳤으며, 평가결과 수용성은 연구기관 성과에 관련성이 있는 것으로 확인되었다. 또한, 성과가 높은 기관들은 전반적으로 기관평가시스템에 대한 긍정적 인식과 함께 평가결과 수용태도도 높다는 점을 확인 할 수 있었다. 그러나 출연(연) 기관평가시스템의 전반적 취약점들에 의해 평가결과에 대한 수용도가 높지 않고, 정부 및 연구회 차원에서도 평가결과의 적극적인 활용에 제약이 있음도 알 수 있었다. 끝으로 이러한 연구결과에 따른 개선점을 제시하고, 향후 연구방향과 한계점에 대하여 논의하였다.

• 제어로봇시스템학회논문지
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• 제6권2호
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• pp.197-206
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• 2000

A hybrid control structure for vision-based soccer robot system is considered. The structure is om-posed of four levels such as the role action behavior and execution levels. The control structure which is a combination of hierarchical and behavioral structures can efficiently meet the behavior and design specifications of a soccer robot system Among the four levels only the design of the action level is proposed in the paper and is experimentally evaluated. Design hypothesis and evaluation method are presented to improve the reliability and accomplishment of the robot system. Due to the essential element of soccer robot system design a systematic design procedure of the action level is proposed With the proposed structure and algorithm of the action level the excellent result was shown at the MiroSot'98 held in France.

• Journal of information and communication convergence engineering
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• 제11권3호
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• pp.167-172
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• 2013

Recently, mobile communication systems are suffering from exponentially increasing data traffic. As a promising solution to the increase in data traffic, a coordinated multi-point transmission and reception (CoMP) scheme has been proposed. Although a great deal of research has been done on this new technology, the performance of mobile communication systems with CoMP has not been evaluated properly in a typical indoor environment. To address this, we have developed a system-level simulator and evaluated the performance of mobile communication systems with CoMP. Unlike previous works, we have used an actual antenna pattern in our simulator and link-level results are properly taken into account through link-level abstraction. By using a system-level simulator, we have evaluated the performance of mobile communication systems with CoMP in an indoor environment and found that unlike an outdoor cellular environment, CoMP may not improve the performance of overall mobile communication systems in an indoor environment.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2002년도 추계학술대회 논문집 전력기술부문
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• pp.361-364
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• 2002

The paper presents a basic study on reliability evaluation using METRIS for long term expansion planning of transmission system. The main frame of methodelogy of the reliability evaluation of a transmission system in the METRIS is based on evaluation philosophy that the reliability level of a transmission system is equal to difference between the reliability level of HLII and that of HLI. While basic general theory of probabilistic reliability evaluation of transmission system has been presented, the GUI characteristics of input/out data system of METRIS have been demonstrated by the RBTS case study on METRIS.