• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2002년도 ICCAS
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• pp.49.2-49
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• 2002

This paper describes the configuration of a multi-agent system that can recognize human intentions. This system constructs ontologies of human intentions and enables knowledge acquisition and sharing between intelligent agents operating in different environments. This is achieved by using a bi-directional associative memory network. The process of intention recognition is based on fuzzy association inferences. This paper shows the process of information sharing by using ontologies. The purpose of this research is to create human-centered systems that can provide a natural interface in their interaction with people.

• 기술사
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• 제38권1호
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• pp.35-43
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• 2005

What are main contents of Balanced National Development Five Years Plan? We will study for contents and policies of the plan's six themes. Six themes of the plan are the drive strategy, the rearing of the worldwide progressive cluster, the local promotion in the strategic industry, the formation of the square national circulation road network, the consolidation of the metropolitan area and the independent drop-out region, and the fund and raising plan. And especially, we will study the details of the national land-structure network formation.

• 한국정보과학회:학술대회논문집
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• 한국정보과학회 2004년도 봄 학술발표논문집 Vol.31 No.1 (A)
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• pp.715-717
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• 2004

인터넷의 폭발적인 성장으로 인하여 MAN(Metropolitan Area Network)은 기존 음성 트래픽 전송 중심의 SONET/SDH(Synchronous Optical NETwork/Synchronous Digital Hierarchy) 환경에서 데이터 트래픽을 수용 할 수 있는 MSPP(MultiService Provisioning Platform) 환경으로 변해가고 있다. 이러한 네트워크 환경에서 이종 망간의 스위칭 역할을 수행하는 NG-SDH장비는 각 망간의 OAM을 제공하기 위해 OAM(Operation/Administration/Maintenance)신호에 대한 IWF(InterWorking Function) 기능을 필요로 하게 된다. 본 논문은 이종 망간 OAM 기능 제공을 위한 IWF에 대해 분석, 정의하고 이를 기반으로 NG-SDH 장비 블록 내에서 이종망간 OAM 기능을 제공할 OAM 변환기를 설계하였다.

• Journal of Multimedia Information System
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• 제3권4호
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• pp.149-154
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• 2016

Wireless mesh networks (WMNs) are used for metropolitan area network that requires high network throughput for handling many users. TDMA-based access is a common solution for this problem and several scheduling methods have been proposed. However, existing heuristic methods have room for improvement at network throughput although they are low complexity. In this paper, we propose a novel divided scheduling method based on structural characteristics in order to improve network throughput in WMNs. It separately schedules neighbor links of gateways and that of the other links by different scheduling algorithms. Simulation-based evaluations show that our proposal improves up to 14% of network throughput compared with conventional scheduling algorithm script.

• 가족자원경영과 정책
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• 제10권3호
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• pp.97-111
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• 2006

The objective of this research is to analyze how main social relation network of middle-aged women such as family, friends and neighbors, etc affects the preference for silver town. For this objective, structured questionnaires were distributed to 309 middle-aged women at the age of 40-59 years old living in Seoul and new cities of metropolitan area. Statistics such as ANOVA, Pearson Coefficient and Multiple Regression were adopted for statistical analysis. The main result of this research is as follows: First, housewives showed higher preference for silver town than people involved in other occupations. Second, though the relation of friends and neighbors among the social relation network of middle-aged women affected the preference for silver town, that of family did not affect significantly. The result of this research suggests that it is necessary to adopt policy considering the relation of friends and neighbors among the social relation network of middle-aged women so as to activate silver town.

• 대한지리학회지
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• 제44권2호
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• pp.187-205
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• 2009

최근 지리학 및 교통 관련 분야에서는 교통 네크워크의 잠재적 손실이 지리 공간상에서 어떠한 영향을 주는가를 살피는 연구가 중요한 주제로 등장하고 있다. 서울의 지하철망은 대규모의 도심 통행을 지지히는 중요한 기반시설이며, 특히 환승역은 그 기능을 상실할 경우 전체 교통망의 신뢰도에 큰 영향을 줄 수 있는 중요한 교통 입지시설이다. 이 논문은 지하철 환승역의 기능 손실이 지하철망의 신뢰도과 대응력에 어떠한 영향을 주는지를 네트워크의 위상학적인 차원, 전체 지리 공간, 그리고 개별 환승역 차원에서 살펴본다. 시뮬레이션을 통한 분석 결과, 서울 지하철망은 상당히 높은수준의 네트워크 신뢰도를 보였으나 환승역 간에는지리적으로 유의미한 변이가 있음을 확인하였다.

• 대한환경공학회지
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• 제29권6호
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• pp.706-714
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• 2007

본 연구에서는 배급수계통에서 잔류염소와 THMs의 분포를 예측하는 방안을 제시하였다. 잔류염소와 THMs의 등의 수질변화에 대해 현장조사를 실시하였고, 수체와 관벽에 대한 잔류염소 감소계수와 THMs의 생성계수를 산출하여 관망해석에 의한 수질모델링에 적용하였다. 병실험을 통해 잔류염소 병렬 1차 수체 반응계수를 구하고, 5개 관벽 감소 모델을 비교 평가하여 1차 관벽 감소계수 산출하고 적용했을 때 잔류염소 현장 측정값과 관망 수질모델링에 의한 예측간의 평균절대오차 및 평균제곱근오차가 각각 0.03, 0.037 mg/L로 가장 작았다. 또한 병실험에 의한 THMs생성량을 비선형 회귀분석으로 1차 생성계수를 구하고 현장 측정값과 비교하였다. 그 결과, 9월의 현장 측정값과 예측값의 결정계수 $R^2$는 0.98, 11월에는 0.82로 예측이 가능하였다.

• 한국실내디자인학회논문집
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• 제22권4호
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• pp.141-148
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• 2013

This study aims to investigate the eco-friendly planning methods for a sustainable apartment houses in the Metropolitan area of Seoul. Eco-friendly plans that considers the environmental issues were attempted from the beginning of 2000s, and since then, many apartment houses in Korea were built using this concept. They were, however, generally focusing on the physical and spatial aspects of the site plan. After the Seoul C40 weather summit conference in 2009, the low carbon green housing standard has been emphasized and thus the chemical concept was added to the existing physical planning methods. Under such a background, this study intends to investigate the eco-friendly plans for the apartment houses in the 2000s. This includes an ecological network plan, an ecological base plan, a building greening plan, a water treatment plan, and an energy saving plan. Based on the analysis and synthesis of these planning methods in the early 21st century, it would be possible to set up a proper future plan to enhance the sustainable built environment in the housing industry in the coming years.

• KIEE International Transactions on Power Engineering
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• 제5A권4호
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• pp.331-338
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• 2005

In this paper, an improved maintenance scheduling approach suitable for the competitive environment is proposed by taking account of profits and costs of generation companies and the formulated combinatorial optimization problem is solved by using Reactive Tabu search (RTS). In competitive power markets, electricity prices are determined by the balance between demand and supply through electric power exchanges or by bilateral contracts. Therefore, in decision makings, it is essential for system operation planners and market participants to take the volatility of electricity price into consideration. In the proposed maintenance scheduling approach, firstly, electricity prices over the targeted period are forecasted based on Artificial Neural Network (ANN) and also a newly proposed aggregated bidding curve. Secondary, the maintenance scheduling is formulated as a combinatorial optimization problem with a novel objective function by which the most profitable maintenance schedule would be attained. As an objective function, Opportunity Loss by Maintenance (OLM) is adopted to maximize the profit of generation companies (GENCOS). Thirdly, the combinatorial optimization maintenance scheduling problem is solved by using Reactive Tabu Search in the light of the objective functions and forecasted electricity prices. Finally, the proposed maintenance scheduling is applied to a practical test power system to verify the advantages and practicability of the proposed method.

• Journal of Communications and Networks
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• 제8권4호
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• pp.369-377
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• 2006

Recently, the metropolitan area network (MAN) has attracted much attention in telecommunication research and has emerged as one of the most important research topics in the community. Several standards representing the first step for developing metropolitan networks have been published; IEEE 802.16 (WiMAX) has taken a relevant role in reaching the goal of realizing a full-service network all over a urban and suburban area. At the same time, the wireless local area networks (WLAN) have been widely used for in-home or short range communications, mainly basing on the IEEE 802.11 (WiFi) standard. A consequence is the increasing interest in interworking technology, that allows an interconnection between different standards by maintaining certain properties, mainly in terms of quality of service (QoS). One of the major issues is to design bridging devices capable of transparently interconnect different wireless technologies. In this paper, we propose two interconnection bridging solutions between WiMAX and WiFi links; the first is more based on the concept of maintaining a certain end-to-end QoS level independently from the wireless technologies used. The second method is more devoted to the reduction of the implementation complexity at the cost of no QoS assurance. The performance of the two methods are compared by resorting to computer simulations showing the advantages of each one technique.