• Proceedings of the KIEE Conference
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• 2007.04a
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• pp.166-168
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• 2007

This paper is dealing with how to control of a client robot's movement for instructions from a server PC and a wireless andremote control Robot that sends the server information of images for monitoring. To implement this. 802.11x WLAN with TCP/IP socket programming is used to get the driving instructions from the server PC and control movements of the robot such as a forward, backward and directions. As well as this, ARM9 cored PAX255 embedded processor and Linux OS is used for the function transmitting BMP format of 320 ${\times}$ 240 pixel for stopped image data.

• 제어로봇시스템학회:학술대회논문집
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• 2000.10a
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• pp.107-107
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• 2000

This paper focuses on a method to connect mobile devices such as mobile robot, ACV and UTC with Profibus network. In this paper, the IEEE 802.11 wireless LAN is used for wireless extension of Frofibus, and four major issues are introduced to implement the wireless extended Profibus; First, the integration method between Profibus and IEEE 802.11 is introduced. Second, the implementation method of gateway is proposed. Three, the virtual polling mode algorithm is developed for satisfaction of real-time characteristics required in industrial network. Finally, we implement a experimental model, and carried out the performance analysis of wireless extended Profibus. This results show that wireless extended Profibus is suitable to industrial network such as automated container terminal.

• 한국IT서비스학회:학술대회논문집
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• 2007.05a
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• pp.488-493
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• 2007

최근 정보통신 기술의 발전으로 인하여 어느 장소에서든 컴퓨터 또는 무선장치를 사용하여 집안의 지능형 가전기기들을 점검하고 제어 할 수 있는 수준까지 이르렀다. 이와 같은 서비스를 제공하기 위한 요소기술 중에 마이크로소프트사에서 발표한 UPnP(Universal Plug & Play)는 TCP/IP 프로토콜을 기반으로 하여 각 지능형 가전기기에 IP주소를 할당하여 어느 곳에서나 누구나 편리하게 지능형 가전기기의 서비스를 이용할 수 있도록 해준다. 본 논문에서는 UPnP 미들웨어 기반의 홈 네트워크에서 웹 기반의 인터페이스를 통해 지능형 가전기기를 쉽게 관리할 수 있는 홈 게이트웨이와 지능형 가전기기 간 연동 시스템을 설계하고 구현한다.

• Proceedings of the Korean Information Science Society Conference
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• 2006.10d
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• pp.435-440
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• 2006

최근 정보통신 기술의 발전으로 인하여 어느 장소에서든 컴퓨터 또는 무선장치를 사용하여 집안의 지능형 가전기기들을 점검하고 제어 할 수 있는 수준까지 이르렀다. 이와 같은 서비스를 제공하기 위한 요소기술 중에 마이크로소프트사에서 발표한 UPnP(Universal plug & Play)는 TCP/IP 프로토콜을 기반으로하여 각 지능형 가전기기에 IP주소를 할당하여 어느 곳에서나 누구나 편리하게 지능형 가전기기의 서비스를 이용할 수 있도록 해준다. 본 논문에서는 UPnP 미들웨어 기반의 홈 네트워크에서 웹 기반의 인터페이스를 통해 지능형 가전기기를 쉽게 관리할 수 있는 시스템을 설계하고 구현한다.

• 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.

• Proceedings of the Korea Information Processing Society Conference
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• 2000.10b
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• pp.1165-1168
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• 2000

WAP은 무선환경에서 발견되는 저 대역폭, 높은 지연하에서 기존의 TCP/IP/HTTP/HTML을 최적화해서 적용하기 위한 일련의 프로토콜이다. WAP은 웹컨텐츠를 이동전화나 PDA등에서 받아 볼 수 있게 해준다. 그러나 WAP 게이트웨이가 컨텐츠제공자에게 속해있지 않다면 단대단 보안을 지원하지는 못한다. 본 논문은 ITLS를 제안하여 WAP 게이트웨이에서 평문의 메시지를 보지 못하게 한다. 기본원리는 웹서버의 보안 상대를 게이트웨이가 아닌 클라이언트로 변경하고, 클라이언트는 웹서버와 게이트웨이를 위해 두번 암호화하도록 하는 것이다. 즉 게이트웨이는 클라이언트로부터 수신한 암호문을 한번만 복호화하고 재암호화 없이 바로 웹서버에게 보내는 것이다. 반대방향도 유사한 형태이다. 이러한 기능을 제공하기 위해 WTLS 핸드쉐이크 프로토콜에 새로운 메시지 유형을 추가하고, 응용데이터 암호화 또는 복호화 규칙도 변경하였다.

• Journal of the Institute of Electronics Engineers of Korea CI
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• v.42 no.2 s.302
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• pp.39-48
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• 2005

In this paper, we implement the multimedia remote control system by using existing internet service or wired online. We also provide user-friendly convenient environment with developed application program named EzPlay and PC-EPG. The multimedia remote control system consists of integrated wireless transceiver of PC and TV connected USB type and the users can easily use lots of contents because EzPlay program provides appropriate UI mode on the PC and TV screen. The unposed system can operate real-time playing, reserved video receding and data storing function using internet mesh based on signal detecting control theory. The PC-EPG system is implemented by server/client web program and the client program based on visual C++/MFC processes data storing in client computer through TCP/IP. It also provides intelligent function that constructs database according to user's preference.

• Journal of the Korean Institute of Intelligent Systems
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• v.25 no.4
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• pp.334-341
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• 2015

This paper develops a new system for remotely monitoring and controlling the windows and doors in mobile environment. We design and implement the opening and shutting unit, the gateway, and the control server system, respectively. The opening and shutting unit consists of the driver using DC motor and the motion controller which monitors the state and transfers the control information. The gateway supports TCP/IP and CDMA protocol, which is the interface of wire and wireless communication for transferring the current state and control information. The control server consists of the program to store and process the control information, the middleware to support the processing of various state message, and DB for monitoring the state and remotely controlling the system. Especially, an application software and the Web-based user interface have also been developed to support the mobile environment. The operation performances, environment influences, driving persistences, and operation failure ratio, which are based on PC and smart-phone, have been tested in 2 authorized agencies. The test results show that the developed system has a superior performance.

• Journal of Korea Multimedia Society
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• v.10 no.1
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• pp.74-82
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• 2007

IPv6 is the internet protocol for next generation which can solve the problem of IPv4 protocol. Mobile IPv6 efficiently provides the mobility for mobile devices holding the properties of IPv6. iSCSI(Internet Small Computer System Interface) is a block-oriented storage access protocol that enables a user to recognize a remote storage as their own local block device through general TCP/IP networks. Since iSCSI uses a standard Ethernet switch and router for this kind of access, it can not only be applized to Ethernet technologies, but can also be used to create a storage networking system without any distance restrictions that can equally be applied to a wireless network environment. Accordingly, this paper presents an alternative approach to overcome the limited storage space of mobile devices based on the IPv6 iSCSI initiator driver which was originally designed for wired networks. Also, this paper describes about the implementation and performance analysis of mobile education service system using virtual storage devices in IPv6 wireless networks.

• Journal of Internet of Things and Convergence
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• v.6 no.3
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• pp.1-6
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• 2020

This paper aims to integrate the previous models about mean object transfer latency in one framework and analyze the result through the computational experience. The analytical object transfer latency model assumes the multiple packet losses and the Internet of Things(IoT) environment including multi-hop wireless network, where fast re-transmission is not possible due to small window. The model also considers the initial congestion window size and the multiple packet loss in one congestion window. Performance evaluation shows that the lower and upper bounds of the mean object transfer latency are almost the same when both transfer object size and packet loss rate are small. However, as packet loss rate increases, the size of the initial congestion window and the round-trip time affect the upper and lower bounds of the mean object transfer latency.