• Proceedings of the Korean Information Science Society Conference
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• 2005.11a
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• pp.10-12
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• 2005

인터넷 및 네트워크가 급격하게 발전함에 따라 많은 피해가 발생하고 있으며, 이러한 피해중 웜은 많은 장비 및 네트워크 상의 위협을 준다 이러한 위협이 되는 웜을 잘 대처하기 위해서는 웜의 행동자체에 대한 파악을 반드시 해야 하고 이에 선행 연구작업으로써 웜 분류는 반드시 실시되어야 한다. 외국의 웜 분류 연구중 UC Berkeley와 시만텍사의 분류방안을 살펴보고 그러한 분류 방안에 기반한 트래픽 및 웜 행동 패턴을 기준으로 전파특성과 웜의 행동 단계별 기준하에 재정립 및 분류 기법을 제안하겠다. 이러한 웜의 분류는 차후 시뮬레이터 모듈의 구현과 칵 모듈의 조합을 통한 구체적인 웜 모델링에 대한 연구의 기초가 된다.

• Proceedings of the IEEK Conference
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• 2003.07c
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• pp.2689-2692
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• 2003

본 논문에서는 향후 인터넷 환경에서 필수적인 요건이 될 수 있는 인터넷 멀티 캐스팅의 여러 프로토콜중 공유 트리 방식의 하나인 CBT 프로토콜에서 송신자와 수신자 사이의 경로 즉 비용을 줄이기 위해 기존의 코어 선택 알고리즘을 개선할 수 있는 알고리즘을 제안한다. CBT 프로토콜에서는 공유 트리의 구성이 코어 라우터를 중심으로 이루어지고 이 코어 라우터를 통해 그룹에 가입/ 데이터 전송/ 탈퇴 등이 이루어지게 되므로 코어 라우터의 선정은 전체적인 효율성 선정의 중요 요소가 된다. 여기서는 모든 노드의 전체 비용을 산출하여 가장 비용 요소가 적은 노드를 선정하는 알고리즘을 제안하며, 네트워크 시뮬레이터를 통해 사용율 및 평균비용을 기존 방식과 비교하여 그 결과에 대해서 논한다.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2005.06a
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• pp.785-791
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• 2005

Reconfigurability of machine tools is one of the critical factors to realize the responsive manufacturing systems to satisfy the mass-customization production. This paper presents the methods to model and simulate the machine tools on Internet in response to change in the machining requirements. Specifically, a set of module combination rules and a modeling method of the structure of machine tools using connectivity graph are developed. In response to the user requirements, kinematic relations and structures of machine tools can be derived using the module combination rules and connectivity graph relationships. Internet-based simulator of machine tools is implemented and presented. The developed machine tool simulator can be used to verify the structure of machine tools derived from the user requirements.

• The Journal of Korea Institute of Information, Electronics, and Communication Technology
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• v.5 no.3
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• pp.110-116
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• 2012

As rapid development of the Internet, there are increasing interests about quality of service of VoIP using the Internet network and established PSTN. There was some study going on to improve the quality of service from the point of view of supplier's mainly. However recently, the demand for setting up the objective standards that service provider can offer to customers is needed as the interests from customers has been going up. In this study, we analysed the results from the test using PESQ which is a parameter of quality of service. we offer the conditions of network which guarantees the minimum quality of phone call using VoIP.

• Archives of design research
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• v.15 no.1
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• pp.191-202
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• 2002

As family types have been diverse, patterns of living and living space became diverse as much as users are. Therefore, it is needed to provide various remodeled design of living space corresponding to changes of users'living patterns, and to provide these remodeling process to users directly on the web. In this paper, use scenario for the Internet-based Virtual Apartment Remodeling Simulator is researched as an export system to remodel space in accordance with users diverse lifestyle paradigm and the website is developed. The study consists of four parts. First, the general concept of remodeling, including the range and types of remodeling, are defined, and the misleading terms in this field are reviewed and organized by secondary research Second, fixed factors and variable factors are differentiated in the complex building for residence and business that was decided as a basic building type in this study. Third, there needed a database for consulting, final material, pre-estimation real estimation for simulation of remodeling. This database was introduced along with floor plan and elevation. Finally, the remodeling simulator is presented by the case study developed on the web. The system structure and use scenario are also presented. In order to present and inspect design alternatives, prototype was produced. The Final simulator was enhanced by defeating problems regarding interface efficiency and missing information of existing online site.

• The KIPS Transactions:PartD
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• v.14D no.5
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• pp.555-564
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• 2007

Internet streaming systems consist of a media server, a streaming sewer, and terminals. The media server delivers multimedia contents such as video and/or audio to the streaming server, which distributes the contents to terminals as well. Existing Internet streaming systems have a bottleneck problem in the streaming server because of the limit of the processing capacity of the streaming server and therefore a streaming server can not accomodate more terminals than the limit. As a solution to this problem, P2P streaming systems have been lately proposed and investigated, using P2P distributed architectures. Actually, however, there exist many difficulties in the design and implementation of P2P streaming systems, because it needs many real computers and various network constructions. In this paper, we have proposed and defined a P2P streaming system model such as the architectural model, the timing model, the behavior model, and the performance metrics. And also we have implemented an NS2 based P2P streaming system simulator called P2PStreamSim. Finally, we have verified it through test simulations and analyzed the results.

• Journal of IKEEE
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• v.15 no.1
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• pp.86-95
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• 2011

In this paper, we propose a testbed system for the crisis management system of the power grid(CMS-PG) using satellite communication network. For the verification of CMS-PG, the proposed system composed of the simulator of satellite communication network and the simulator of phase measurement unit. Proposed satellite communication simulator can evaluate the delay and the robustness of the communication according to the rainfall and the humidity of local site. And the proposed simulator can calculates the voltage stability by hardware implementation using FPGA. Using the proposed testbed system, we adapted its function of crisis management system for the conventional power grid.

• Proceedings of the KIEE Conference
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• 2007.10a
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• pp.367-368
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• 2007

본 논문은 홈 네트워크 시스템에서 사용자의 편의를 고려한 홈 서버 구현 방안에 대해 제안한다. 홈 서버는 리눅스 기반의 임베디드 보드 또는 PC를 사용할 수 있고 시스템은 인터넷 망을 기반으로 하고 있으며 클라이언트, 서버, 시뮬레이터로 구성되어 있다. 사용자는 웹 브라우저를 내장한 모든 기기에서 서버에 접속할 수 있다. 클라이언트 프로그램은 모든 종류의 CPU와 OS를 지원하기 위하여 자바 애플릿을 사용하였다. 사용자는 별도의 프로그램 설치 없이 원격에서 서버의 웹 페이지를 통해 접속하고 각종 기기들을 제어할 수 있으며 손쉽게 데이터를 공유할 수 있다. 서버는 리눅스 기반으로 웹 서비스를 할 수 있도록 서버가 구축되어있고 클라이언트 프로그램과 동일한 이유로 자바언어를 사용하여 서버 프로그램을 작성하였다. PC 대신 사용할 수 있는 임베디드 리눅스 보드는 내장형 시스템을 구성하는데 유용하며 홈 네트워크 시스템뿐만 아니라 각종 분야 등에도 널리 이용되어 질 수 있다. 임베디드 보드는 많은 자원을 필요로 하지 않는 국한된 목적의 시스템에 적용하기에 적합하며 널리 사용되고 있다. 시스템 구성을 위해 임베디드 보드에 리눅스를 포팅하고, 웹서버를 사용 가능하게 만들어 준 후, 자바 프로그램을 실행하기 위한 JVM(Java Virtual Machine)과 서블릿 및 JSP등의 자바 코드를 이해할 수 있는 엔진을 포팅하였다. 이로써 웹 서버로서의 역할과 홈 네트워킹 서버로서의 역할을 동시에 수행하게 된다. 시뮬레이션 프로그램은 자바 어플리케이션 프로그램을 사용하였고 데이터의 정상적인 전달여부와 기기들의 상태를 모니터링 할 수 있다.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.10 no.2
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• pp.151-157
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• 2010

Rapid technological advances in the area of micro electro-mechanical systems (MEMS) have spurred the development of small inexpensive sensors capable of intelligent sensing. A significant amount of research has been done in the area of connecting large numbers of these sensors to create robust and scalable Wireless Sensor Networks (WSNs). The resource scarcity, ad-hoc deployment, and immense scale of WSNs make secure communication a particularly challenging problem. Since the primary consideration for sensor networks is energy efficiency, security schemes must balance their security features against the communication and computational overhead required to implement them. In this paper, we combine location information and probability to create a new security aware multipath geographic routing protocol. The implemented result in network simulator (ns-2) showed that our protocol has a better performance under attacks.

• Journal of Engineering Education Research
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• v.3 no.1
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• pp.27-41
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• 2000

Recently there have been many Internet-based studies to provide personal users an efficient educational tool making use of multimedia data. The typical examples are remote education and virtual university where many educational trials on theory-based contents have been performed more frequently than those on experiment-based contents for engineering area. This paper describes about a base system implemented as an example of Internet-based experiment-oriented educations to establish cyber engineering laboratories for mechanics, electronics and chemistry. For the first time as a model of cyber engineering laboratories we herein Introduce in detail a server-and-client-based simulative method in which the result may be displayed on computer monitor of client PC while a simulator program is executed on the server. Secondly we introduce an interactive method in which the user of client PC may not only communicate directly with experiment server after initial connection with management server but also he can confirm the status of experiment being performed by way of video as well as experimental result.