• Ecology and Resilient Infrastructure
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• 제3권4호
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• pp.247-255
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• 2016

강우 시 표면 유출에 의한 비점오염물질의 하천 유입은 도시 하천 관리에 부정적인 영향을 미치며 특히 강우 초기의 수질농도가 매우 높은 것으로 알려져 있다. 본 연구에서는 하천의 제외지 또는 유수지 등의 공간을 활용하여 침강 및 여과작용을 이용하여 최소한의 에너지 및 비용을 이용하여 오염물질을 정화시키면서 하천의 수질 및 수량 관리에 긍정적인 작용을 할 수 있는 장치와 시스템을 개발하고자 하였다. 빗물 자동 모니터링 시스템을 이용하여 초기 우수에 대한 유량 및 수질을 파악하였고 이를 토대로 처리 시스템의 설계 기준을 확립하고자 하였다. 초기우수 제어 장치는 침전 장치만으로도 총부유물질 (TSS) 84 - 95%, 총질소 (TN) 31 - 46%, 총인 (TP) 42 - 86%의 제거 효율이 나타났다. 또한 일기 예보를 통해 강우에 의한 유량 및 수질을 예측하고 처리장치의 상태 및 자동 모니터링시스템과 연계하여 시설을 종합적으로 관리할 수 있는 강우 유출 종합관리 시스템 ISTORMS (Integrated Stormwater Runoff Management System)를 개발하였다. 본 연구 결과는 도시 하천의 수질 및 유량 환경개선에 효율적으로 적용될 수 있을 것으로 기대된다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2007년도 제38회 하계학술대회
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• pp.127-129
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• 2007

Since the competitive market environment was introduced into the electric power industry, the structure of the industry has been changing from vertically integrated system to functionally unbundled and decentralized system composed of multiple (decision-making) market participants. So the market participants such as Gencos or LSE (load serving entity) need to forecast the market clearing price and thus build their offer or bidding strategies. Not just these market players but also a market operator is required to perform market analysis and ensure simulation capability to manage and monitor the competitive electricity market. For fulfilling the demand for market simulation, many global venders like GE, Henwood, Drayton Analytics, CRA, etc. have developed and provided electricity market simulators. Most of these simulators are based on the optimization formulation which has been used mainly for the least cost resource planning in the centralized power system planning and operation. From this standpoint, it seems somehow inevitable to face many challenges on modeling competitive market based on the method of traditional market simulators. In this paper, we propose a kind of new method, which is MAS based market simulation. The agent based model has already been introduced in EMCAS, one of commercial market simulators, but there may be various ways of modeling agent. This paper, in particular, seeks to introduce an model for MAS based market simulator.

• 한국BIM학회 논문집
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• 제8권4호
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• pp.49-59
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• 2018

Recently, the application of BIM for port & harbour facilities has been increasing, as it is widely applied to the infrastructure field both at domestic and abroad. However, the port and harbour projects still have very poor facilities information management system and the application level of BIM is very low compared to other facilities. Even if BIM is applied for those project, it is very difficult to determine in advance what information is needed without an accurate understanding of the business process. The purpose of this study is to develop a BIM framework for port & harbour facilities and to examine its applicability. To do this, we structured the classification of the port & harbour facilities and constructed object-based classification system based on ISO12006-3 standard. We also derived the BIM framework requirements from the viewpoint of process, standard, interface, and information, and confirmed the linkage of the BIM object classification system in the framework item. The applicability of the BIM framework for inspection process cases of port & harbour was examined. Accordingly, this study can solve requirement setting method, which is the non - procedural and non - systematic project information, in the BIM application process of the port & harbour project with the BIM framework. In addition, the framework is expected to be integrated into the system to play a key role in the selection of project objectives, and the ability to clearly identify the information requirements required by the BIM manager to perform the project.

• 한국정보시스템학회지:정보시스템연구
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• 제14권2호
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• pp.101-132
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• 2005

There is a need for research to identify the integrated, rather than fragmented, factors that determine users' acceptance of Internet shopping. Using the newly revised technology acceptance model (TAM) as a theoretical framework, this study investigates the effect of a set of information systems quality (information quality and system quality) and trust on intention to use Internet showing through perceived ease of use and perceived usefulness. Using structural equation modeling, the results strongly support the utilization of TAM in predicting users' intention to use Internet shopping, and demonstrates the effects of critical external variables on behavior intention through perceived ease of use and perceived usefulness. Systems quality such as response time, accessibility, and usability has significant effects on perceived ease of use of Internet shopping. Futhermore, trust has also a significant effect on perceived usefulness, perceived ease of use, intention to use Internet shopping, and actual usage of Internet shopping. Based on these results, this study suggests managerial implications of new Internet shopping strategies, focusing on the integration of information systems quality and trust in order to achieve sustainable competitive advantage in Internet shopping.

• 한국군사과학기술학회지
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• 제17권4호
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• pp.395-403
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• 2014

Recent technological advancement has a profound effect on the ways that the war is being conducted and fought. The advanced communications, information, computing and sensor technologies enable the combat units to be integrated in the battlefield management network. By exchanging and sharing real-time battlefield information that is critical for the successful outcome of military engagement, the legacy forces are becoming much more effective and lethal than ever before, The bigger picture of such phenomena can be summarized as the concept of Network Centric Warfare(NCW). The main purpose of this study is to compare the outcome of regional combat engagement between the legacy forces and the future combat systems(FCS). The FCS capitalizes on the advanced technologies within the frame of NCW. This study uses the modeling and simulation methodology to assess the effectiveness of two different combat forces. The simulation results show that the FCS is more effective, hence vindicating the superiority of technologically advanced combat units.

• 반도체디스플레이기술학회지
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• 제20권4호
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• pp.119-124
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• 2021

In a situation where Moore's law, which states that the performance of semiconductor integrated circuits doubles every two years, is showing a limit from a certain point, and it is difficult to increase the performance due to the limitations of exposure technology.In this study, a wafer hybrid method that can increase the degree of integration Various research on bonding technology is currently in progress. In this study, in order to achieve rotational precision between wafers in wafer hybrid bonding technology, modeling of θ_z alignment stage and VCM actuator modeling used for rotational alignment, magnetic field analysis and desgin, control, and evaluation are performed. The system of this study was controlled by VCM actuator, capactive sensor, and dspace, and the working range was ±7200 arcsec, and the in-position and resoultion were ±0.01 arcsec. The results of this study confirmed that safety and precise control are possible, and it is expected to be applied to the process to increase the integration.

• 인터넷정보학회논문지
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• 제23권1호
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• pp.39-47
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• 2022

디지털트윈은 현실데이터를 수집하고 가상공간을 구현하는 측면에서 핵심 인프라에 대한 디지털 관리체계 구축의 하나로 자리 잡고 있다. 하지만 현재 국내에는 3차원 기반의 통합적인 해양정보 분석도구 및 기술이 부재하며, 육상과 달리 유동적인 해양정보를 디지털화하기 위해서는 새로운 3D모델링 기술과 자료처리 기술이 요구되나 추진에 한계가 존재한다. 이에 본 연구에서는 해양 디지털트윈 관련 동향과 디지털트윈 기술 요소를 분석하여 향후 해양 디지털트윈의 구조, 데이터, 모델링, 활용 플랫폼 4가지 부문으로 개발 방향을 제시하고자 한다.

• 국제학술발표논문집
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• The 9th International Conference on Construction Engineering and Project Management
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• pp.245-252
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• 2022

Risk identification for bridge projects is a knowledge-based and labor-intensive task involving several procedures and stakeholders. Presently, risk information of bridge projects is unstructured and stored in different sources and formats, hindering knowledge sharing, reuse, and automation of the risk identification process. Consequently, there is a need to develop structured and formalized risk information for bridge projects to aid effective risk identification and automation of the risk management processes to ensure project success. This study proposes a semantic risk breakdown structure (SRBS) to support risk identification for bridge projects. SRBS is a searchable hierarchical risk breakdown structure (RBS) developed with python programming language based on a semantic modeling approach. The proposed SRBS for risk identification of bridge projects consists of a 4-level tree structure with 11 categories of risks and 116 potential risks associated with bridge projects. The contributions of this paper are threefold. Firstly, this study fills the gap in knowledge by presenting a formalized risk breakdown structure that could enhance the risk identification of bridge projects. Secondly, the proposed SRBS can assist in the creation of a risk database to support the automation of the risk identification process for bridge projects to reduce manual efforts. Lastly, the proposed SRBS can be used as a risk ontology that could aid the development of an artificial intelligence-based integrated risk management system for construction projects.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2003년도 ICCAS
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• pp.2471-2474
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• 2003

This paper focuses on the stability and operability of a man-machine system considering a human operator. Some papers' main interest has been the stability only, but the operability such as fatigue is also the other main interest. In a man-machine system, feelings such as motional, visual, and kinesthetic are important since those enable operators to work easily or fatigue operators. A model of a man-machine system has been developed. Motional, visual, and kinesthetic feelings may be considered as feedbacked sensor signals. We also have quantified the degree of fatigue with respect to reference operation. This is a performance index to be optimized. Several methods are presented to optimize the degree of fatigue and the stability of the integrated system. Examples are presented to show that the usefulness of the proposed modeling method and fatigue mitigating algorithm.

• 한국측량학회지
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• 제23권4호
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• pp.359-366
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• 2005

3차원 지형정보에 대한 사용자 요구의 증가에 따라 GPS/INS, 레이저 스캐너 시스템이 조합된 항공레이저측량 기술이 각광받고 있다. 본 논문에서는 항공레이저측량(LiDAR) 시스템의 정확도 확보를 위해 검정장에서의 측량데이터를 바탕으로 시스템 검정을 실시하였다. 검정결과, 수평 정확도는 ${\pm}15{\sim}30\;cm$ 이내, 수직정확도는 ${\pm}15cm$ 이내로 나타났다. 이를 통해 항공레이저측량 데이터를 이용하여 정밀 DEM 및 등고선 제작. 도시지역의 3차원 모델 제작, 엔지니어링 설계 등의 활용에 충분함을 입증하였다.