• 한국정보통신학회논문지
• /
• 제17권2호
• /
• pp.515-524
• /
• 2013

신뢰성 있는 소프트웨어 개발을 위해서 가장 중요한 단계 중의 하나가 소프트웨어 테스트이다. 최근에 점진적이고 반복적인 소프트웨어 개발 방법론이 각광을 받으면서, 소프트웨어의 작은 변경에 따른 회귀 테스트의 중요성이 점점 커지고 있다. 또한 센서네트워크와 같은 다수의 노드 환경에서 동작하는 소프트웨어를 검증하기 위한 시뮬레이터 환경이 필요하다. 본 논문에서는 네트워크 프레임워크와 통합시뮬레이터 간의 인터페이스 모듈을 구현하여, 네트워크 프레임워크로 구현한 센서네트워크 어플리케이션을 다양한 가상의 환경에서 단위테스트하기 위한 환경을 제공한다.

• 대한전자공학회:학술대회논문집
• /
• 대한전자공학회 2000년도 추계종합학술대회 논문집(1)
• /
• pp.453-456
• /
• 2000

This paper describes IMT-2000 Testbed System which consists of ATM based IMT-2000 exchange(A-lMX), RNC simulator, HLR simulator, SCP simulator, B-ISDN subscriber simulator and MS simulator. Simulators were developed to verify the mobile functions and basic services of IMT-2000 like Videophone, VoD(Video on Demand), and Internet access. UPT(Universal Personal Telecommunication) service could be adapted well to this testbed system. Until the entire network elements are developed fully, this testbed system can be used to prove new services in IMT-2000 network.

• 경영과학
• /
• 제26권1호
• /
• pp.113-126
• /
• 2009

By the newly emerging network access technology, we face the new heterogeneous network environment. Focusing on the co-existence of multiple access network technology and the complex service needs of users, the wireless service operators should present the stable service quality for every user. For this, the service operators should build the new operation framework which combine the pre-established network and newly adopted one. Our problem is finding the optimal heterogeneous network operation framework. We suggest market-based marginal cost function for evaluating the relative value of resource of each network and develop the whole new heterogeneous network operation framework. To test the applicability of developed operation framework, we build large-scale JAVA simulator. By this development, we can easily test the new network environment in practical engineering field.

• 대한산업공학회지
• /
• 제37권4호
• /
• pp.279-288
• /
• 2011

The past researches focused on the supply chain network that consists of factories, distribution centers and retailers for single product type. This research is required because the factory for single product type is advanced to reconfigurable type in order to produce various products, according to customers' various purchase forms and time. This research is also required because in the past researches, the material flows from factories to distribution centers and from distribution centers to retailers, but recently, there are material flows between distribution centers. The supply chain network in this research consists of reconfigurable manufacturing system, multi-layered distribution centers, and retailers. A simulator is developed to analyze the material flow on the supply chain network. The developed simulator is web-based designed by using Java Server Page and MS-SQL, so as to maximize the convenience for users.

• 한국통신학회논문지
• /
• 제37C권10호
• /
• pp.993-1003
• /
• 2012

본 논문은 워게임 모델과 통신 모델을 HLA/RTI를 이용하여 연동 시뮬레이션 함으로써 부대 전투력과 통신 시스템의 요구 성능을 상호 분석하는 방법을 제안한다. 전투 효과도의 분석은 통신 모델의 시뮬레이션을 통해 얻어진 통신 효과도을 반영하여 워게임 모델의 시뮬레이션을 통해 이루어진다. 통신 시스템의 요구 성능 분석은 워게임 모델의 시뮬레이션에 의해 만들어진 작전 시나리오 및 부대 정보를 이용하여 통신 모델의 시뮬레이션을 통해 이루어진다. 이를 위해 연대급 규모 방어 작전을 모델링 및 시뮬레이션 하였으며, 적군의 생존 비율과 아군의 FM 무전기 송신 출력이 상호 분석을 위한 분석 지수로 사용되었다.

• 한국CDE학회논문집
• /
• 제9권3호
• /
• pp.212-219
• /
• 2004

This paper presents the visualization method of the KAIST interactive bicycle simulator. The simulator consists of two bicycles of 6 DOF and 4 DOF platforms, force feedback handlebars and pedal resistance systems to generate motion feelings; a real-time visual simulator, a HMD and a beam projection system; and a 3D sound system. The system has an integrating control network with the server-client network structure for multiple simulators. The visual simulator generates dynamic images in real-time while communicating with other modules of the simulator. The operator of the simulator can have realistic visual experience of riding on a velodrome or through the KAIST campus, while being able to watch the other bicycle with an avatar.

• 한국통신학회논문지
• /
• 제32권5A호
• /
• pp.441-450
• /
• 2007

본 논문에서는 위성망 자원할당 및 분석 툴(SNRAT : Satellite Network Resource Allocation & Analysis Tool)을 활용하여 위성통신체계에 대한 링크성능 분석결과를 제시하였으며, 모의위성망을 구성하여 성능분석 툴로 예측한 링크 성능을 검증하였다. 통신위성은 지상장비와 달리 정지궤도에 발사하여 궤도 내 운용을 시작하면, 더 이상 성능의 수정이나 수리가 불가능하고, 운용 가능한 수명이 제한되어 있기 때문에 적기에 배치하여 운용하는 것이 매우 중요하다. 따라서, 위성 발사 전 위성망 자원할당 및 분석 툴을 이용하여 통신품질, 지원용량 및 항재밍 성능 등을 예측하고, 모의위성망을 구축하여 지상단말과 망제어기와 같은 지상장비 및 중계기 규격의 적합성을 증명하였으며, 여러 망 운용 시나리오에 대한 시험을 통해 최적의 운용방안을 도출하였다.

• KSII Transactions on Internet and Information Systems (TIIS)
• /
• 제9권7호
• /
• pp.2548-2567
• /
• 2015

Recently, there has been a clear trend towards the application of ad hoc networking technology in civil aviation communication systems, giving birth to a new research field, namely, aeronautical ad hoc networks (AANETs). An AANET is a special type of ad hoc wireless network with a significantly larger scale and distinct characteristics of its mobile nodes. Thus, there is an urgent need to develop a simulator to facilitate the research in these networks. In this paper, we present a network simulator, Aero-Sim, for AANETs. Aero-Sim, which is based on the freely distributed NS-2 simulator, enables detailed packet-level simulations of protocols at the MAC, link, network, transport, and application layers by composing simulations with existing modules and protocols in NS-2. Moreover, Aero-Sim supports three-dimensional network deployment. Through several case studies using realistic China domestic air traffic, we show that the proposed simulator can be used to simulate AANETs and can reproduce the real world with high fidelity.

• 전기학회논문지
• /
• 제56권8호
• /
• pp.1373-1381
• /
• 2007

This paper presents a graphical windows-based software for the education and training of transmission network charge. The motivation for the development of the simulator is to provide students with a simple and useable tool for gaining an intuitive feel for transmission network charge. The developed simulator consists of the main module (MMI, GUI), the power flow module (PF), the power flow tracing module (PFT), and usage cost DB module (UCD). Each module has a separate graphical and interactive interfacing window. The developed simulator provides with two power system analysis methods (i.e., DC-PF and Modified DC-PF) and supports the PSS/E input data format to load input data of power system. Also, power flow tracing can be calculate using four methods such as "Felix Wu", "Modified Felix Wu", "DCLF ICRP", and "Reverse MW mile". Results of calculation for transmission usage cost are displayed and compared on the window through the table and/or chart. Therefore, the developed simulator can be utilize as a useful tool for effective education and training of transmission network charge.

• 전력전자학회:학술대회논문집
• /
• 전력전자학회 2005년도 전력전자학술대회 논문집
• /
• pp.634-637
• /
• 2005

We propose a charge/discharge model for network based vehicle. These model include motor, alternator, lamp, brake, window brush, air conditioner, etc.. Also, we simulate these models in Matlab. The simulation results show that error range is less than 3%. So, we can adopt these model to charge/discharge simulator for network based vehicle. If this error range can be shrunk within 2%, we can use this simulator for comertial use.