• Proceedings of the Korean Information Science Society Conference
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• 2002.04a
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• pp.523-525
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• 2002

DOS (Denial Of Service)에 대한 공격은 시스템의 정상적인 동작을 방해하여 시스템 사용자에 대한 서비스 제공을 거부하도록 만드는 공격으로 현재 이의 공격에 대한 탐지 알고리즘 및 연구들이 많이 제시되고 있다. 본 논문에서는 네트워크 또는 트랜스포트 계층에 해당하는 프로토콜(TCP/IP, ICMP, UDP) 공격을 분석하고 이들 프로토콜의 취약점을 공격하는 DOS 공격 이외의 다른 공격을 탐지하기 위하여 프로토콜의 기능별, 계층별에 따른 모듈화 작업을 통하여 네트워크 침입탐지 시스템을 설계하였다.

• Proceedings of the Korea Information Processing Society Conference
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• 2003.05b
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• pp.1261-1264
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• 2003

인터넷 인구의 증가로 인하여 보다 강력한 컴퓨팅 파워를 위해 네트워크로 연결되어 모든 것을 공유하고자 하는 노력이 진행되었다. 이를 관리하는 기존의 시스템들은 시스템관리나 네트워크 장비, 회선에 대한 관리 등이 따로 수행되고 있는 실정이다 이에 따른 복잡한 네트워치 자원들을 관리하기 위해서 플랫폼 독립적 통신을 위한 JAVA RMI와 TCP/IP, SNMP를 이용한 네트워크 자원관리 시스템을 설계 및 구현하였다.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.5 no.5
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• pp.447-453
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• 2004

In this paper, we propose a new system to block harmful Internet information based on IP spoofing. The proposed system is located on a organization's internal network and monitors all outgoing traffic and lets all this traffic go outside. Once the proposed system detects a host's access to a harmful site, it sends the host a pseudo RST packet that pretends to be the response from the harmful site, and prevents the connection between the host and the harmful site. The proposed software system is installed on only a server, and need not be installed on user hosts at all. Thus we can maintain and upgrade the blocking system easily. The performance evaluation of the proposed system shows that it effectively blocks the access to the harmful sites. Since the proposed system is based on IP spoofing, it can be used badly as a hacking tool. Finally we propose some methods to eliminate this possibility.

• Journal of Advanced Marine Engineering and Technology
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• v.34 no.1
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• pp.125-132
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• 2010

IEC61162-3 known as NMEA2000 protocol is approved as a standard network of SOLAS ship by ISO and used for the instrument network which exchanges data in real-time. For easy the development of ship network equipments, this study is focused on the development of SoC which can convert to NMEA2000 protocol from various kind of protocols such as TCP/IP, NMEA0183, RS422 and others using FPGA and u-Blaze. In this paper, we composed NMEA2000 protocol stack on FPGA and verified NMEA2000 network communication of FPGA system by connecting with commercialized devices through PC Hyper-terminal and network monitoring program.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2003.05a
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• pp.704-711
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• 2003

Recently, the demands for real-time service and multimedia data are rapidly increasing. There are significant redundancies between header fields both within the same packet header and in consecutive packets belonging to the same packet stream. But there are many overheads in using the current UDP/IP protocol. Header compression is considered to enhance the transmission efficiency for small size of payload. By sending the static field information only once initially and by utilizing dependencies and predictability for other fields, the header size can be significantly reduced for most packets. This work describes an implementation for header compression of the headers of U/UDP protocols to reduce overhead on Ethernet network. Typical UDP/IP Header packets can be compressed down to 7 bytes and the header compression system is designed and implemented on the Linux environment. Using the designed Header compression system between a server and a client have the advantage of effective data throughput in network.

• Proceedings of the KIEE Conference
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• 2008.07a
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• pp.1706-1711
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• 2008

This paper proposes a new Web based-control concept & design method and implementation of LonWorks network system for a large scale renewable energy energy control and monitoring system in building. The Experimental LonWorks network system using LonWorks/Ethernet(Web) server is designed and fabricated. This article addresses issues in architecture of LonWorks/Ethernet sever, embedded processors architecture for converting LonTalks protocol to Modbus protocol and software, and Internet technologies. It is also verified that the multi-induction motor control and monitoring system using LonWorks/Ethernet server have available, interoperable, reliable performance characteristics from the experimental results, Especially, The seamless integration of TCP/IP networks with control networks allows access to any control point from anywhere. Thus, the results provide a available technical data for remote distributed control system of industrial and buildings field.

• Korean Journal of Air-Conditioning and Refrigeration Engineering
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• v.13 no.8
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• pp.787-795
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• 2001

An experimentation on the on-line fault detection and diagnosis(FDD) system has been performed with HVAC system in he experimental building constructed inside the large scale environmental chamber. Personal computer with a home-made FDD program by pattern recognition method utilizing artificial neural network was connected on-line via Ether-net TCP/IP to the supervisory control server for HVAC system. The FDD program monitored the HVAC system by 1 minuted interval. The results showed that he FDD program detected the sudden or abrupt faults such s those in fans, sensors and heater, etc.

• The Journal of Information Systems
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• v.17 no.1
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• pp.155-171
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• 2008

This thesis proposed a method that connecting step motor to image send board which can acquire image to move and remote controlling via streaming image board of PDA(personal digital assistant) based on embedded Linux which is using wireless network There are three embedded Linux system to embody movable image send board. First, though the wireless network a signal of PDA is transmitted to the board which has embedded Linux and a system which is controlled by the expansion I/O port of the board. Second, it's a system streaming realtime image at a PDA which has embedded Linux. The last is a system which controls a process of image board using TCP/IP communication and image send board at PC. These are the system which can use industrial settings and homes. It can also make use of an embodiment method about travelling image robot.

• Journal of the Korea Society of Computer and Information
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• v.10 no.1 s.33
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• pp.27-34
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• 2005

Current security reinforcement systems are Passive defense system that only blocks filter to all traffic from the attacker. So, Those are weak re-attack and Stepping Stones attack because active response about attacker is lacking. Also, present techniques of traceback need much time and manpower by log information collection and trace through the personal inspection and active response is lacking. In this paper, We propose technique for TCP connection traceback that can apply in present internet and trace to inserted marking on IP header to correspond re-attack and Stepping Stones attack. Therefore, Proposed technique is unnecessary correction of existing network component and can reduce size of marked information and overhead of resources.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2008.08a
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• pp.171-174
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• 2008

최근 산업자동화의 발전으로 용접분야에서도 무인화 및 자동화 시스템 구축이 활성화되고 있으며 산업 현장에서의 인터넷의 보급이 일반화되어 TCP/IP 통신을 통한 원격관리 시스템도 일반화되고 있다. 본 논문에서는 아크 용접 시스템에서 주요한 용접인자인 용접전류, 용접전압 정보를 이용하고 신경회로망을 적용하여 용접현상을 모니터링 하였으며, 분석된 용접현상에 대한 중요한 정보를 TCP/IP 통신을 통해 원격에서 관리가 가능하도록 구현하였다. 마지막으로 다양한 용접 모니터링을 위해 효율적인 신경회로망 모델을 제시하고, 원격 모니터링 및 용접품질관리를 위한 원격관리 시스템 구현 방법을 제시한다.