• Title/Summary/Keyword: Simulation Client

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Development of A Web-based Simulation System for Axi-Symmetric Deep Drawing (축대칭 디프드로잉 공정의 웹 기반 해석시스템 개발)

  • 정완진
    • Transactions of Materials Processing
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    • v.12 no.6
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    • pp.550-557
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    • 2003
  • In this study, a web-based system was developed by utilizing finite element method and virtual system designed using Virtual Reality Modeling Language (VRML). The simulation program for axi-symetric sheet forming is developed using finite flement method. The developed system consists of two modules, client module and server module. The client module was developed by using Active-X control. The input data for FEM calculation is transferred to the server module by using communication protocol. Then sever module performs several successive processes: input data generation, forming simulation, conversion of results to VRML format. After that, the results from the simulation can be visualized on the web browser in client computer. Besides, client module offers the capability to control and navigate on virtual forming machine and calculated result. By using this system simulation result can be investigated more realistically in virtual environment including forming machine.

Web-Based Simulation under Distributed Environment (분산 환경하에서의 웹기반 시뮬레이션에 관한 연구)

  • 이영해
    • Journal of the Korea Society for Simulation
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    • v.7 no.2
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    • pp.79-90
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    • 1998
  • This paper introduces the concept of web-based simulation and suggests the structure of web-based simulation which reduces the simulation run time and performs simulations in efficient way under distributed environments. Since its introducing in 1996, web-based simulation has been studied only with a tool of applet, but in this paper a method of server applications for client applets will be used. In server application, server transfers objects requested by clients such as simulation engines, reports, files. After each client connects to web-server, and then server allocates simulation modules to connected clients. These work magnify the transferring applets from server and simulation models which were made by clients. This paper also processes a structure for managing efficiently web-based simulation under distributed environment and steps in which clients connect, model, simulate with distributed structure, and programs of proposed structure.

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A Web-based Simulation Environment based on the Client/Server Architecture for Distance Education: SimDraw (원격교육을 위한 클라이언트/서버구조의 웹 기반 시뮬레이션 환경 : SimDraw)

  • 서현곤;사공봉;김기형
    • Journal of KIISE:Software and Applications
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    • v.30 no.11
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    • pp.1080-1091
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    • 2003
  • Recently, the distance education has been rapidly proliferated with the rapid growth of the Internet and high speed networks. There has been relatively much research with regard to online lecture (teaching and studying) tools for the distance education, compared to the virtual laboratory tools (for self-study and experiments). In this paper, we design and implement a web-based simulation tool, named as SimDraw, for the virtual laboratory in the distance education. To apply the web-based simulation technology into the distance education, some requirements should be met; firstly, the user interface of the simulation should be very easy for students. Secondly, the simulation should be very portable to be run on various computer systems of remote students. Finally, the simulation program on remote computers should be very thin so that students can easily install the program onto their computers. To meet these requirements, SimDraw adopts the client/server architecture; the client program contains only model development and animation functions so that no installation of a client program onto student's system is required, and it can be implemented by a Java applet in Web browsers. The server program supports client programs by offering the functions such as remote compiling, model storing, library management, and user management. For the evaluation of SimDraw, we show the simulation process using the example experimentation of the RIP(Routing Information Protocol) Internet routing protocol.

Bandwidth Requirement and Priority-based Synchronization Methods in Hybrid Client-Server Architecture for Mobile Multiplayer Games (모바일 멀티플레이어 게임을 위한 하이브리드 클라이언트-서버 구조의 대역폭 요건과 우선순위 기반 동기화 기법)

  • Kim, Jinhwan
    • Journal of Korea Multimedia Society
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    • v.17 no.4
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    • pp.526-534
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    • 2014
  • Most of the multiplayer games available online are based on a client-server architecture because this architecture gives better administration control to the game providers than peer-to-peer architecture. In this architecture, the server is responsible for all the communication between the connected clients. The weakness of this architecture is its bandwidth requirement and scalability. Peer-to-peer architectures have then been proposed to solve these issues. In this paper, we propose a hybrid client-server architecture in which the game state is partially shared by the mobile terminal to achieve consistency among different players. Like a peer-to-peer architecture, this architecture uses client-side capacities to reduce bandwidth requirements for the server and improves consistency in wireless networks. Client events have different timeliness and consistency requirements according to their nature in the game world. These requirements lead to tasks with different priorities on CPU processing. In the proposed architecture, either the server or the client applies consistency mechanism according to the priority level. Simulation experiments show that the bandwidth of the server in this architecture is smaller than that of the client-server architecture. As a result, the server in the proposed architecture can accommodate more clients with enhancing the scalability.

A Study on Implementation of Roaming Function in Digital Mobile Communications System using a Client-Server Model (클라이언트-서버 모델을 사용한 디지틀 이동통신 시스템의 로우밍 기능 구현에 관한 연구)

  • 임선배;박진우
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.17 no.12
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    • pp.1371-1379
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    • 1992
  • In this paper, we describe the general concept of digital mobile communications system and present a client-server model for the implementation of roaming function, which is on of the most important functions in digital mobile communications system. And finally we also describe our simulation test and analysis for the presented client-server model.

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Development of web-based Simulation System for Finite Element Analysis (웹기반 유한요소해석 시스템 개발)

  • Yoon E. Y.;Kim J.;Kang B. S.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • 2005.10a
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    • pp.384-388
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    • 2005
  • The purpose of this paper is to develop web-based simulation system which can be used anytime, anywhere without expensive hardware and software. In this paper, a web-based simulation system was developed by utilizing finite element analysis and client/server system using visual C++ and ASP. The client/server system consist of two modules, post-processor, management system module. The input data for FEM calculation is transferred to the management system. After that, the result from the simulation can be visualized through the post-processor module. By using this system, small industries and individuals can considerably save the time and expense.

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Remote Dynamic Control of AMl Robot Using Network (네트워크를 이용한 AM1 로봇의 원격 동적 제어)

  • 김성일;배길호;김원일;한성현
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • 2001.04a
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    • pp.229-233
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    • 2001
  • In this paper, we propose a remote controller for robot manipulator using local area network(LAN) and internet. To do this, we develope a server-client system as used in the network field. The client system is in any computer in remote place for the user to log-in the server and manage the remote factory. the server system is a computer which controls the manipulator and waits for a access from client. The server system consists of several control algorithms which is needed to drive the manipulator and networking system to transfer images that shows states of the work place, and to receive a Tmp data to run the manipulator. The client system consists of 3D(dimension) graphic user interface for teaching and off-line task like simulation, external hardware interface which makes it easier for the user to teach. Using this server-client system, the user who is on remote place can edit the work schedule of manipulator, then run the machine after it is transferred and monitor the results of the task.

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A Bandwidth Estimation Scheme to Improve the QoE of HTTP Adaptive Streaming in the Multiple Client Environment

  • Kim, Sangwook;Chung, Kwangsue
    • KSII Transactions on Internet and Information Systems (TIIS)
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    • v.12 no.1
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    • pp.308-324
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    • 2018
  • HTTP adaptive streaming (HAS) is a promising technology for delivering video content over the Internet. HAS-based video streaming solutions rely on bandwidth estimation to select the appropriate video bitrate. Video streaming solutions that consider network conditions provide users with seamless video playback. However, when multiple clients compete for a common bottleneck link, conventional bandwidth estimation schemes that consider only one client overestimate the network bandwidth due to the ON-OFF traffic pattern. The bandwidth overestimation can cause Quality of Experience (QoE) degradation, such as unnecessary changes in video quality, and unfairness of video quality. In this paper, we propose a client-side bandwidth estimation scheme to obtain a better QoE of HAS in the multiple-client environment. The proposed scheme differentiates the client buffer status according to the buffer occupancy, and then estimates the available network bandwidth based on the buffer status and segment throughput. We evaluate the performance of HAS implemented in the ns-3 network simulator. Simulation results show that compared with the conventional schemes, the proposed scheme can enhance the QoE.

Reducing Outgoing Traffic of Proxy Cache by Using Client-Cluster

  • Kim Kyung-Baek;Park Dae-Yeon
    • Journal of Communications and Networks
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    • v.8 no.3
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    • pp.330-338
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    • 2006
  • Many web cache systems and policies concerning them have been proposed. These studies, however, consider large objects less useful than small objects in terms of performance, and evict them as soon as possible. Even if this approach increases the hit rate, the byte hit rate decreases and the connections occurring over congested links to outside networks waste more bandwidth in obtaining large objects. This paper puts forth a client-cluster approach for improving the web cache system. The client-cluster is composed of the residual resources of clients and utilizes them as exclusive storage for large objects. This proposed system achieves not only a high hit rate but also a high byte hit rate, while reducing outgoing traffic. The distributed hash table (DHT) based peer-to-peer lookup protocol is utilized to manage the client-cluster. With the natural characteristics of this protocol, the proposed system with the client-cluster is self-organizing, fault-tolerant, well-balanced, and scalable. Additionally, the large objects are managed with an index based allocation method, which balances the loads of all clients well. The performance of the cache system is examined via a trace driven simulation and an effective enhancement of the proxy cache performance is demonstrated.