• Journal of Korean Society for Atmospheric Environment
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• 제18권E4호
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• pp.215-221
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• 2002

The real-time modeling system, named AirWatch System, has been developed to evaluate the environmental impact from a large source. It consists of stack TMS (TeleMetering System) that measures the emission data from the source, AWS (Automatic Weather Station) that monitors the weather data and computer system with the dispersion modeling software. The modeling theories used in the system are Gaussian plume and puff models. The Gaussian plume model is used for the dispersion in the simple terrain with a point meteorological data while the puff model is for the dispersion in complex terrain with three dimensional wind fields. The AirWatch System predicts the impact of the emitted pollutants from the large source on the near-by environment on the real -time base and the alarm is issued to control the emission rate if the calculated concentrations exceed the modeling significance level.

• 한국경영과학회:학술대회논문집
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• 한국경영과학회 2001년도 추계학술대회 논문집
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• pp.50-54
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• 2001

Information systems development entails planning, analysis, design and construction phases. The analysis phase identifying user requirements is the most important of these phases. Since unidentified defects in the early phase causes increased work and costs as development proceeds, the quality of analysis results affects the quality of the resultant system. Major tasks in the analysis phase are data modeling and process modeling. Research on building a knowledge-based system for data modeling have been conducted much, however, not sufficiently for process modeling. As a system environment with high user interaction increases, research on process modeling methods and knowledge- based systems considering such environment are required. In this research, a process modeling framework for information systems with high user interaction is suggested and a knowledge-based system for supporting the suggested framework is implemented. A proposed model consists of the following tasks: event analysis, process analysis, and event/process interaction analysis. Event analysis identifies business events and their responses. Process analysis break down the processes of an enterprise into progressively increasing details. Decomposition begins at the function level and ends when the elementary process level is reached. Event/process interaction analysis verifies the results of process analysis and event analysis. A knowledge-based system for supporting a proposed process modeling framework is implemented in a web-based environment.

• 한국지리정보학회지
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• 제8권1호
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• pp.49-62
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• 2005

비행 시뮬레이션과 같은 가상현실 시스템은 실제 존재하는 도시의 가상환경을 필요로 하며, 항상 변화하고 있는 도시환경과 최대한 일치하는 도시모델을 유지하여야 한다. 따라서 주기적으로 갱신되는 지형공간정보를 활용할 수 있는 도시 모델링 방법이 필요하다. 또한 비행 시뮬레이션은 가까운 지역뿐만이 아니라 먼 거리의 건물을 효과적으로 표현할 수 있어야 한다. 이를 위하여 본 논문에서는 고해상도 항공사진과 수치지도로부터, 가상 도시환경을 비교적 적은 노력으로 모델링 할 수 있는 방법을 제시한다. 이미지 기반의 모델링 기법을 아파트처럼 단순한 구조의 건물이 많은 한국의 도시환경과 지형공간정보의 특성에 맞도록 적용하여, 수많은 건물을 폴리곤으로 모델링 하지 않고 효율적으로 표현할 수 있도록 한다. 제안하는 방법은 지형공간정보의 전처리 과정과 가상 도시환경 모델링 과정으로 구성되며, 건물의 높이 맵을 만드는 간단한 전처리 과정만으로 가상 도시환경을 모델링 할 수 있어, 기존의 폴리곤 기반의 모델링 방법이 대규모 도시 가상환경에서 멀리 있는 수많은 건물의 표현을 생략하였던 문제점을 개선하였다.

• 대한안전경영과학회지
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• 제5권4호
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• pp.131-145
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• 2003

A strategic plan for an immediate situation must be present in a business enterprise to deal actively and efficiently with the demand environment of new customer. The purpose of this paper is to provide research about the manufacturing strategy situations of the Korean manufacturing company. And this paper is a part of Modeling on Manufacturing Strategy. We emphasizes the importance of dynamism and complexity on the competitive environment, and classify the manufacturing strategy by trade-off model, cumulative model, sandcone model, strategic fit model, and competitiveness model.

• 한국군사과학기술학회지
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• 제11권6호
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• pp.127-134
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• 2008

An autonomous reconnaissance ground robot performs its duty in various different environments such as mountain-scape, desert and under-water through changing its shape and form according to the environment it is working in. Making a prototype robot for each environment requires extra cost and time. It is also difficult to modify the problem after production. In this paper, we propose the adoption of M&S(Modeling & Simulation) environment for the production and design of the autonomous reconnaissance ground robot. The proposed method on the M&S environment contributed to the more effective and less time consuming production of the robot through the Pre-Modeling and Pre-Simulation process. For example, we showed the design and implementation of the autonomous reconnaissance ground robot under the proposed environment and tools.

• 한국대기환경학회지
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• 제8권2호
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• pp.128-137
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• 1992

Sulfur dioxide distributions in the Seoul area in 1988 were reproduced by using ISCLT which was the most versatile model among the preferred models recommended by USEPA. Modeling was performed season by season in order to take into account distinct four seasons in Korea. Predicted concentrations were close to the observed ones in most regions, but were different from the observed ones in such regions where the effect of sources outside the Seoul area was important. For better results of the modeling, the modeling domain should be chosen after a careful examination of principal wind directions.

• 로봇학회논문지
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• 제6권2호
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• pp.189-196
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• 2011

This paper presents a method of topological modeling using only low-cost sonar sensors. The proposed method constructs a topological model by extracting sub-regions from the local grid map. The extracted sub-regions are considered as nodes in the topological model, and the corresponding edges are generated according to the connectivity between two sub-regions. A grid confidence for each occupied grid is evaluated to obtain reliable regions in the local grid map by filtering out noisy data. Moreover, a convexity measure is used to extract sub-regions automatically. Through these processes, the topological model is constructed without predefining the number of sub-regions in advance and the proposed method guarantees the convexity of extracted sub-regions. Unlike previous topological modeling methods which are appropriate to the corridor-like environment, the proposed method can give a reliable topological modeling in a home environment even under the noisy sonar data. The performance of the proposed method is verified by experimental results in a real home environment.

• 산업공학
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• 제8권2호
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• pp.135-150
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• 1995

An object-oriented simulation modeling environment, AgvTalk, is presented to provide flexible modeling capabilities for simulation of many alternative AGV systems. The hierarchical features and modularity of AgvTalk create possibilities for the extension and reuse of simulation object components. Also, detailed behavior of each object in the AGV system can be modeled easily and exactly in AgvTalk because there are no limiting modeling constructs. The modeling capabilities of AgvTalk is demonstrated by designing and simulating a conceptually different configuration of AGV systems, known as, the tandem configuration. Between the tandem and conventional AGV systems, the characteristics and design methodology in AgvTalk are described. Also, simulations between two systems are compared with AgvTalk in the job shop environment.

• 한국시뮬레이션학회:학술대회논문집
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• 한국시뮬레이션학회 2001년도 The Seoul International Simulation Conference
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• pp.484-484
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• 2001

The sophistication of current software applications results in the increasing cost fur software development time. The component-based software development framework is proposed to overcome the difficulty and time-consuming requirements by modularity and reusability. As is the general software case, a component-based simulation framework encourages the reusability of the real system model based on the modularity of the applied simulation methodology. This paper presents a component-based simulation environment that is based on the DEVS/COM run-time infrastructure. The DEVS (Discrete Event System Specification) formalism provides a formal modeling and simulation framework for the generic dynamic systems [1] and Microsoft's COM (Component Object Model) is one of the strongest competitor fur the component standard. The reusability by the DEVS/COM simulation environment saves model development time remarkably and component technology make simulator itself to be a subparts of real application.

• 한국멀티미디어학회논문지
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• 제6권7호
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• pp.1286-1301
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• 2003

본 논문은 현실감 여는 실시간 영상 기반 환경 탐색을 위해 영상 분할 기반 환경 모델링에 의한 시점 변경이 가능한 환경 탐색, 다중 환경 맵을 이용한 환경 모델의 통합 및 확장에 의한 환경 탐색 방법들을 제안한다. 영상 분할 환경 모델링 방법은 환경 맵에 적용하기 용이하며 환경의 특성에 따른 깊이값 추출 방법으로 손쉽게 환경 모델링이 가능하다. 또한, 시점이 이동되고 시차를 갖는 환경의 표현이 가능하다. 그러나, 환경 맵의 단일 해상도에 의해 발생하는 영상의 흐림 현상과 가리움에 의해 환경 맵에서 없는 정보가 나타날시 발생하는 구성된 3차원 환경 모델의 늘어짐 현상이나 정보의 부족으로 인한 영상의 구멍이 발생한다. 이러한 문제를 제거하기 위해서는 다중 환경맵에 바탕을 둔 3차원 환경 모델의 재구성이 필요하다. 본 연구에서는 세밀한 환경 모델링을 통한 시차 표현과 주변 환경의 자유로운 확장을 위해 대응선 기반 환경 모델 통합 방법을 사용한다. 다중 환경맵에 의한 환경 모델링 방법은 최적의 해상도를 갖는 상세한 환경 모델을 생성할 수가 있어 시점이 자유로운 고화질의 탐색 영상 생성이 가능하다.