• 한국통신학회논문지
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• 제21권10호
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• pp.2620-2633
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• 1996

In this paper, a new high-speed local area network using a dual mode switching access (DMSA) protocol implemented on a dual unidirectional bus is described. By utilizing the implicit positionalordering of stations on a unidirectional bus, the proposed system switches between random access mode and the token access model withoug unnecessary delay. Therefore, unlike other hybrid systems such as Buzz-net and Z-net, DMSA does not show a rapid degradation in performance as the load increases. We obtain the average channel utilization and the average access delay by using a simplified analytic model. The numerical results obtained via analysis are compared to the simulation resuls for a partial validation of the approximate model. The performance characteristics of DMSA are superior delay-throughput characteristics at light and medium loads, compared to compared to other LAN systems, and the capability of providing a single active station with full capabity of the channel.

• 대한산업공학회지
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• 제15권1호
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• pp.1-15
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• 1989

In the past few years, increasing numbers of automatic storage/retrieval system (AS/RS) using computer controlled storage/retrieval machine have been installed. This paper introduces two modeling approaches to determine the best operating policy for AS/RS : an M/G/1 queueing model and a computer simulation model. The operating policy consists of three elements. : the operation command cycle, the storage location method, and the operation dispatching rule. The analysis based on M/G/1 model is suitable for a quick and approximate evaluation, due to its inherent strict assumptions. The computer simulation can be used to perform a more realistic analysis. It is shown through the study that a significant improvement in the throughput and/or the space requirement can be expected by determining the best operating policy to a particular system. Most important, the computer simulation demonstrates its powerful capability in evaluating dynamic stochatic systems with imperfect information.

• 기술혁신연구
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• 제15권2호
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• pp.123-152
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• 2007

The striking characteristic of the contemporary global security environment is that the nature of threats has become diverse and complex. For example, transnational and non-military threats including terrorism and proliferation of weapon of mass destruction has increased. In this security environment, Advanced countries funnel their investments for defense budgets into the assurance of key force capability and R&D of cutting-edge core technologies, in consideration of future battlefield environments so as to get an edge on not only defense science and technology but also intelligence capabilities. As shown by past practices of the korea's defense acquisition, the ministry of national defense has tried to enhance its force capabilities in the short-term by purchasing foreign weapon systems rather than by investing in domestic R&D. Accordingly, the technological gaps between the korea and advanced countries were widened due to both insufficient investment in development of domestic technologies and avoidance of technological transfer by advanced countries. Thus, for the effective execution of the R&D budget and the successful performance of the projects, the importance of selection, management and evaluation of the R&D projects is emphasized. So, The objective of this study is that the analysis of the proposal-selection evaluation system for the realization of the successful defense core technology R&D projects. This study focused on the improvement of the proposal-selection evaluation model which can be applicable to the national defense core R&D projects. Using the improved proposal-selection evaluation system, we propose a model to enhance the reliability of the national defense core technology R&D project evaluation system.

• 한국전자거래학회:학술대회논문집
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• 한국전자거래학회 2002년도 e-Biz World Conference
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• pp.65-85
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• 2002

최근 정보통신기술은 급격하게 발전하고 있으며 급변하는 정보화 추세에 탄력적으로 대응하고 유연하게 반응하기 위해서는 적시에 최적의 정보시스템의 구현, 활용. 효율적 유지 관리를 통한 활용의 극대화가 필수적이다. 이는 체계적이고, 과학적이며, 정확하고, 지속적인 점검, 분석 및 평가를 통해 이루어질 수 있으며, 따라서 본 연구의 목적은 기업의 현 정보화 수준을 포괄적이고, 체계적이며, 실용적인 관점에서 평가하고, 결과를 정보화 구현과정에 환류(feedback)시킬 수 있는 통합평가체계를 개발하는 것이다. 연구목적의 달성을 위해 본 연구에서는 첫째. '정보화수준 성숙단계'를 개발하고, 정보화 수준 '평가절차'와 평가영역' 및 절차와 영역을 연결하는 '평가방법'을 포함한 통합평가체계를 개발하며, 마지막으로 실 사례 적용을 통하여 개발된 정보화수준 통합평가시스템의 '적용성'과 '실효성'을 입증하였다.

• 국제학술발표논문집
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• The 7th International Conference on Construction Engineering and Project Management Summit Forum on Sustainable Construction and Management
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• pp.1-7
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• 2017

Korea's domestic construction market and overseas construction order environment are experiencing a decreasing trend, and this trend is expected to continue. Therefore, domestic construction companies are seeking to enter the global construction market. This study analyzes the global construction market and the global competitiveness for global construction companies and provides the results. To this end, this study has developed a model to evaluate the global construction competitiveness level and to evaluated global construction competitiveness in 2016. The evaluation of global construction competitiveness was analyzed based on the competitiveness of construction infrastructure by country, and the evaluation results of competitiveness of construction companies. These assessments were based on 20 detailed international statistics (ENR, Global Insight, Compass, etc.). The evaluation results are as follows. First, in regard to the comprehensive global construction competitiveness by country, America ranked first among 20 countries, followed by China. European countries like Spain, Germany and the Netherlands ranked third to fifth, respectively. Korea ranked sixth, one rank higher than that of the previous year. America and European countries remain strong. Second, in regard to the comprehensive building infrastructure competitiveness by country, America ranked first followed by Germany. Korea ranked twelfth, which is the same rank as that of the previous year. When it comes to stability in the construction market, China ranked first and Korea eighth. For construction systems, Sweden ranked first and Korea thirteenth, and for infrastructure, Japan ranked first and Korea tenth. Third, according to the construction company's capability evaluation by country, America ranked first followed by China. Korea ranked fourth, two ranks higher than that of the previous year because of its building competitiveness (fifth → fourth) and design competitiveness (eleventh → eighth) which has improved. When it comes to building competitiveness, China ranked first and Korea fourth. For design competitiveness, America ranked first and Korea eighth, and for price competitiveness, India ranked first and Korea seventh. However, Korea is still in the middle of the pack rank among the 20 countries considered when it comes to design competitiveness. It is ranked eleventh for design productivity and thirteenth for foreign sales against the total sales (internationalization). Thus, Korea needs to improve technical power and tap into new markets for improved competitiveness, including increased productivity. To do so, more R&D investment is required.

• 한국산업정보학회논문지
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• 제27권5호
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• pp.99-117
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• 2022

본 연구는 서비스기업 중 하나인 은행 구성원을 대상으로 은행의 고객경험관리역량이 조직구성원의 직무만족 및 고객지향성에 어떤 영향을 미치는지 확인하고자 한다. 이를 위해 고객경험관리역량, 직무만족, 고객지향성에 대한 이론을 설명하고 이들 간의 관계를 이론 및 실증적으로 검증하였다. 본 연구를 위하여 은행에서 근무하는 접점직원 321명을 대상으로 SPSS23.0, AMOS 23을 이용해 구조방정식 분석을 실시하였다. 본 연구의 분석결과를 살펴보면 은행의 고객경험관리역량의 요소 중 구성원교육, 임파워먼트, 구성원평가, 교차검정은 직무만족 및 고객지향성에 긍정적 영향이 있는 것으로 나타났다. 이에 반해 채널통합은 직무만족과 고객지향성 모두 영향을 미치지 못했으며, 성과관리는 직무만족을 매개로하여 고객지향성에 영향을 미쳤다. 이러한 결과는 조직단위에서 고객경험관리역량을 확인할 수 있는 시사점을 제시하지만, 서비스기업이 은행으로 한정되었다는 한계도 존재한다.

• 한국안전학회지
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• 제37권5호
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• pp.80-88
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• 2022

The Korean nuclear industry had developed the SPACE (Safety and Performance Analysis Code for nuclear power plants) code, which adopts a two-fluid, three-field model that is comprised of gas, continuous liquid and droplet fields and has the capability to simulate three-dimensional models. According to the revised law by the Nuclear Safety and Security Commission (NSSC) in Korea, the multiple failure accidents that must be considered for the accident management plan of a nuclear power plant was determined based on the lessons learned from the Fukushima accident. Generally, to improve the reliability of the calculation results of a safety analysis code, verification is required for the separate and integral effect experiments. Therefore, the goal of this work is to verify the calculation capability of the SPACE code for multiple failure accidents. For this purpose, an experiment was conducted to simulate a Control Element Drive Mechanism (CEDM) break with a safety injection failure using the ATLAS test facility, which is operated by Korea Atomic Energy Research Institute (KAERI). This experiment focused on the comparison between the experiment results and code calculation results to verify the performance of the SPACE code. The results of the overall system transient response using the SPACE code showed similar trends with the experimental results for parameters such as the system pressure, mass flow rate, and collapsed water level in component. In conclusion, it can be concluded that the SPACE code has sufficient capability to simulate a CEDM break with a safety injection failure accident.

• 대한토목학회논문집
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• 제31권1D호
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• pp.99-109
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• 2011

국민경제에 상당한 비중을 차지하는 건설산업에 대하여 적정수준의 경기 유지와 산업의 효율성 개선 및 경제 활성화를 위한 방편으로 민간투자사업이 활성화되고 있다. 최근 민간투자산업이 활성화되면서 민간사업자측에서는 건설사업관리(CM)의 도입을 통한 사업의 성공적 수행을 도모하고 있는 반면, 민간투자사업을 관장하는 주무관청은 민간사업자측에 비해 경험 및 역량이 부족한 실정이다. 이에 본 연구에서는 주무관청의 업무역량을 강화하기 위한 방안으로서 기존의 발주자지원형 CM의 업무확장의 개념으로 기존의 CM의 업무체계를 유지하면서 주무관청을 적극적으로 지원하기 위한 파트너쉽지원관리 (Partnership Support Management; PSM) 방식을 도입하기 위하여 민간투자사업의 추진단계를 사업개발단계, 사업고시단계, 사업평가단계, 사업협약단계 및 변경협약단계의 5단계로 분류하여 PSM 참여가능시점 및 유형과 이해관계자의 상관성을 고려한 PSM 업무수행구조와 업무프로세스를 제안하였다. 본 연구에서 제안된 PSM 업무모델은 주무관청의 업무이해도를 향상하여 업무역량 강화 및 업무 부담을 경감시켜, 민간투자사업의 추진을 효율적으로 수행할 수 있을 것으로 기대된다.

• 한국시뮬레이션학회논문지
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• 제21권1호
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• pp.9-17
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• 2012

워게임 시뮬레이션은 전장의 상황을 모델링하고 전력 평가나 임무 분석을 위해 사용되고 있다. 그러나 워게임 시뮬레이션에서 실제 전장에서 받을 수 있는 영향을 모두 고려하는 것은 매우 복잡하다. 이를 해결하기 위해 우리는 온톨로지 기반의 경로탐색 모델을 제안한다. 이 모델은 전장 상황 데이터를 개념화하고 그 관계를 표현할 수 있는 온톨로지를 사용한다. 또한, 몇 가지 추론 규칙을 정의하여 온톨로지로 부터 새로운 지식을 만들거나 기존의 규칙을 통해 지식을 공유한다. 제안하는 모델의 성능 평가를 위해 우리는 제한된 시뮬레이션 환경을 구성하고 부대 이동 시간, 부대의 전투력, 부대 이동간 소요 비용을 측정한다. 측정된 실험의 결과는 제안하는 모델이 이동 시간과 전투력 손실, 소요 비용 측면에서 이점을 제공한다는 것을 보여준다.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제15권5호
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• pp.1744-1760
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• 2021

Since correlation filter appeared in the field of object tracking, it plays an increasingly vital role due to its excellent performance. Although many sophisticated trackers have been successfully applied to track the object accurately, very few of them attaches importance to the scale and rotation estimation. In order to address the above limitation, we propose a novel method combined with Fourier-Mellin transform and confidence evaluation strategy for robust object tracking. In the first place, we construct a correlation filter to locate the target object precisely. Then, a log-polar technique is used in the Fourier-Mellin transform to cope with the rotation and scale changes. In order to achieve subpixel accuracy, we come up with an efficient surface fitting mechanism to obtain the optimal calculation result. In addition, we introduce a confidence evaluation strategy modeled on the output response, which can decrease the impact of image noise and perform as a criterion to evaluate the target model stability. Experimental experiments on OTB100 demonstrate that the proposed algorithm achieves superior capability in success plots and precision plots of OPE, which is 10.8% points and 8.6% points than those of KCF. Besides, our method performs favorably against the others in terms of SRE and TRE validation schemes, which shows the superiority of our proposed algorithm in scale and rotation evaluation.