• 자동차안전학회지
• /
• 제15권3호
• /
• pp.34-42
• /
• 2023

Simulation-based virtual testing is known to be a major requirement for verifying the safety of autonomous driving functions. However, in the simulation environment, there is a difficulty in that all driving environments related to the autonomous driving system must be realistically modeled. In particular, C-ITS (Cooperative-Intelligent Transport Systems) is essential for urban autonomous driving of Lv.4, but the approach to modeling for C-ITS service in the MILS (Model in the Loop Simulation) environment is not yet clear. Therefore, this paper aims to deal with V2X (Vehicle to Everything) modeling methods to effectively apply C-ITS-based autonomous cooperative driving services in the MILS environment. First, major C-ITS services and use cases for autonomous cooperative driving are analyzed, and a modeling method of V2X signals for C-ITS service simulation is proposed. Based on the modeled V2X messages, the validity of the proposed approach is reviewed through simulations on the C-ITS service use case.

• 산업공학
• /
• 제16권2호
• /
• pp.258-267
• /
• 2003

Recently, virtual reality technologies have been rapidly developed and realtime virtual simulation methods have been extensively employed for several application areas such as game, sports, manufacturing, military, and so on. A 3D database in realtime virtual simulation plays a key role because it makes users feel reality in virtual space. In a application view of 3D database, a systematic construction approach is required to reduce its construction time and increase its quality. However, many researches have been mostly focused on realtime graphic issues and its key technologies. In virtual simulation of transportation equipments, this paper proposes a systematic construction process of 3D database consisting of four stages as follows: 1) determine the activity space of a equipment, 2) collect data related to 3D database construction, 3) make a 3-dimensional modeling strategy, and 4) generate and evaluate a 3D model. This paper also introduces a new procedure of 3D environment modeling, which summarizes and expands our modeling experiences, to be used as a modeling guide.

• 한국시뮬레이션학회:학술대회논문집
• /
• 한국시뮬레이션학회 2001년도 The Seoul International Simulation Conference
• /
• pp.453-458
• /
• 2001

A mobile agent is an autonomous software agent capable of moving from one computer to another while performing its tasks. We view the agent as a discrete event system in the view of its computation and communication. This paper presents a methodology far modeling and simulation of such a mobile agent system as a discrete event system. The methodology is based on the Mobile Discrete Event System Specification (MDEVS) formalism and the associated simulation environment AgentSim which are previously developed by the authors. Within the methodology an atomic model represents dynamics of a mobile agent; a coupled model is modeled as mobile agent servers for representation of structural changes between atomic agents. Being based on the object-oriented environment the modeling methodology exploits inheritance of basic classes AtomicModel and CoupledModel provided by AgentSim.

• 대한수학교육학회지:수학교육학연구
• /
• 제15권1호
• /
• pp.75-105
• /
• 2005

본 연구는 엑셀을 활용한 소그룹 모델링의 흐름과 학생과 엑셀의 상호작용이 모델링에 미치는 영향에 대한 이해를 바탕으로 추후 엑셀을 활용한 소그룹 모델링을 통한 수학 교수ㆍ 학습을 위한 기초적인 정보를 제공하는데 목적이 있다. 엑셀을 활용한 소그룹 모델링의 흐름을 알아보기 위해 학생들이 고려하는 양, 양들간 관계, 구성하는 모델을 바탕으로 모델링 주기를 살펴보았다 또한 학생과 엑셀의 상호작용이 모델링에 미치는 영향을 이해하기 위해 학생과 엑셀의 상호작용을 모델 형성, 모델 정교화, 모델을 통한 상황 해석ㆍ예측ㆍ통제 측면에서 분석하였다. 본 연구로부터 엑셀을 활용한 소그룹 모델링이 어떻게 이루어지는가와 학생-엑셀 상호작용 패턴에 대한 이해를 바탕으로 모델링 도구로서의 엑셀의 잠재력을 확인하고 학생들의 모델링 활동에 있어서의 강점과 취약점을 확인할 수 있었다. 또한 엑셀을 활용한 소그룹 모델링이 보다 효과적으로 이루어지기 위해 요구되는 교사 역할에 관한 시사점을 얻을 수 있었다.

• 한국대기환경학회:학술대회논문집
• /
• 한국대기환경학회 2004년도 춘계학술대회 논문집
• /
• pp.74-75
• /
• 2004

• 한국환경과학회지
• /
• 제27권3호
• /
• pp.203-217
• /
• 2018

For this study, WRF numerical modeling was performed, using RDAPS information for input data on typhoons affecting the Korean peninsula to produce wind data of 700hPa. RAM numerical modeling was also used to calculate 3-second gusts as the extreme wind speed. After comparing wind speeds at an altitude of 10 m to evaluate the feasibility of WRF numerical modeling, modeled values were found to be similar with measured ones, reflecting change tendencies well. Therefore, the WRF numerical modeling results were verified. As a result of comparing and analyzing these wind speeds, as calculated through RAM numerical modeling, to evaluate applicability for disaster preparedness, change tendencies were observed to be similar between modeled and measured values. In particular, modeled values were slightly higher than measured ones, indicating applicability for the prevention of possible damage due to gales. Our analysis of 3-second gusts during the study period showed a high distribution of 3-second gusts in the southeast region of the Korean peninsula from 2002-2006. The frequency of 3-second gusts increased in the central north region of Korea as time progressed. Our analysis on the characteristics of 3-second gusts during years characterized by El $Ni{\tilde{n}}o$ or La Nina showed greater strength during hurricanes that affected the Korean peninsula in El $Ni{\tilde{n}}o$ years.

• 컴퓨터교육학회논문지
• /
• 제8권1호
• /
• pp.105-115
• /
• 2005

단일 영상을 이용하여 구성한 3차원 환경 모델은 고정된 해상도로 인해 발생하는 흐려짐 현상과 가리움에 의해 환경맵에서 없는 정보가 나타날 시 발생하는 구성된 3차원 환경 모델의 늘어짐 현상이나 정보의 부족으로 인한 영상의 구멍이 발생한다. 본 본문에서는 이러한 문제점들을 해결하기 위해 다중 영상들을 이용한 일치 및 통합 방법을 제안한다. 본 연구에서는 세밀한 환경 모델링을 통한 시차 표현과 주변 환경의 자유로운 확장을 위해 대응선에 기반으로 하는 환경 모델 일치 및 통합 방법을 사용한다. 다중 영상에 의한 환경 모델링 방법은 렌더링에 적합한 해상도를 갖는 상세한 환경 모델을 생성할 수가 있어 시점이 자유로운 고화질의 탐색 영상 생성이 가능하다.

• 한국실내디자인학회논문집
• /
• 제27권2호
• /
• pp.154-165
• /
• 2018

For the foundational study on automatic review of the barrier free Environment certification for the socially disadvantaged using BIM modeling information, we first confirm the need of the automatic review by analyzing the barrier free Environment certification an by investigating the existing studies on barrier free Environment certification. After that, we select a primary approach for our research by investigating the related works such as automatic review of the building code. As a next step, we generate the BIM modeling information, extract the classification system, analyze and extract items in the barrier free Environment certification according the extracted system, compares the items with the BIM generation information, and allocate them. And, we showed the potential usability of automatic review by deriving a process to prepare the ruleset structure for the automatic review and to prepare a criteria for BIM modeling guide.

• 한국항공운항학회지
• /
• 제29권3호
• /
• pp.100-110
• /
• 2021

Building Information Modeling(BIM) technology continues to develop and is now being applied to infrastructure facilities. As smart technology based on BIM is applied to the construction industry, the construction of the same data in a common environment is considered to be a very important step in various applications. This study was conducted on methods to establish an open BIM-based airport facility information common data environment. Therefore, this study develops the element technology to establish a common data environment for the integrated management of airport facility information, and aims to standardize data in the common data environment among various technologies and applications. In order to achieve the aim, in this study, the required technologies were derived by examining the common data environment and examining the civil engineering facility field and the case of integrated airport facility management. Through this, standards and development for information standard framework, information requirement level, BIM guidebook, and BIM library were developed in connection with national and higher standards. Through these standards, it is expected that the integrated management of various airport facilities will be efficiently carried out through a standard data platform in the future.

• 제어로봇시스템학회논문지
• /
• 제8권9호
• /
• pp.776-787
• /
• 2002

Automation of welding process in shipyards is ultimately necessary, since the welding site is spatially enclosed by floors and girders, and therefore welding operators are exposed to hostile working conditions. To solve this problem, a welding mobile robot that can navigate autonomously within the enclosure has been developed. To achieve the welding task in the closed space, the robotic welding system needs a sensor system for the working environment recognition and the weld seam tracking, and a specially designed environment recognition strategy. In this paper, a three-dimensional laser vision system is developed based on the optical triangulation technology in order to provide robots with 3D work environmental map. Using this sensor system, a spatial filter based on neural network technology is designed for extracting the center of laser stripe, and evaluated in various situations. An environment modeling algorithm structure is proposed and tested, which is composed of the laser scanning module for 3D voxel modeling and the plane reconstruction module for mobile robot localization. Finally, an environmental recognition strategy for welding mobile robot is developed in order to recognize the work environments efficiently. The design of the sensor system, the algorithm for sensing the partially structured environment with plane segments, and the recognition strategy and tactics for sensing the work environment are described and discussed with a series of experiments in detail.