• Proceedings of the IEEK Conference
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• 2002.06c
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• pp.235-238
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• 2002

This paper presents a remote mobile robot system that transmits streaming video and audio over the lossy packet networks such as (Wireless) LAN. The error resilient video and audio packets are transmitted on the RTP/UDPfP Protocol stack. The mobile robot can be accessed by a certified user from the remoted area. Thus, the movement of mobile robot can be controlled by the operator observing the working surroundings.

• Proceedings of the Korean Information Science Society Conference
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• 2002.10e
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• pp.427-429
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• 2002

내장형 시스템 및 RTOS에 대한 관심이 늘어나면서 낮은 성능의 하드웨어상에서의 네트워킹 기능이 중요한 이슈로 떠오르고 있다. 그러나 기존의 BSD기반의 TCP／IP는 많은 메모리를 필요로 하고 실제로 RTOS에서 자주 사용되지 않는 기능들도 많이 있기 때문에 기존의 TCP／IP 프로토콜 스택의 수정이 불가피하다. 본 논문에서는 낮은 성능의 하드웨어에 적합하게 TCP/IP프로토콜 스택을 경량화하고 메모리 사용에 대한 오버헤드를 줄일 수 있는 프로토콜 스택을 구현하고자 한다.

• Proceedings of the Korean Information Science Society Conference
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• 2002.10e
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• pp.118-120
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• 2002

블루투스는 저 전력과 휴대성이 높은 특징을 갖는 단거리 무선 통신 기술이며 다양한 응용 범위를 지니고 있어 차세대 통신기술로 각광받고 있다. 이에 따라 다양한 블루투스서비스들의 요구가 증대되고 있고 이들의 개발에 필요한 프로토콜 스택의 중요성 또한 커지고 있다. 본 논문에서는 오픈소스 프로토콜 스택인 OpenBT를 블루투스 모듈과 호스트 사이에서 중요한 역할을 하는 HCI를 중심으로 분석하였으며 이를 기반으로 한 응용 프로그램의 구현 및 테스트에 관하여 논하였다

• Proceedings of the IEEK Conference
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• 2002.06a
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• pp.343-346
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• 2002

This paper presents a Prototype system developed for a Bluetooth interfaced VoIP system. The VoIP phone is developed based on tile implementation of a CELP coder on the TI 16bit DSP Processor A PC interfaced with Bluetooth module is used to designing a access point system. Host controller protocol stack is implemented to realize gateway between the wireless and wired line networks. A server application program for user management and call processing, which is based on TCP/IP peer to peer connection, is implemented for tile evaluation of overall interface system.

• Proceedings of the Korea Institutes of Information Security and Cryptology Conference
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• 1998.12a
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• pp.263-275
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• 1998

본 논문에서는 ATM 망에서 정보보호 서비스를 제공하기 위해 기존의 ATM Forum에서의 보호 프로토콜 스택을 분석하여 새로운 보호프로토콜 스택을 제안한다 제안된 보호프로토콜 스택은 ATM 계층에서 기밀성과 무결성 서비스를 제공하기 때문에 기존의 ATM 프로토콜 스택에 대한 변경을 최소화하며 또한 종단시스템간, 종단시스템-스위치간, 스위치간 보호 서비스를 제공할 수 있는 장점이 있다.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.15 no.4
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• pp.2382-2392
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• 2014

In this paper, a new data frame structure for wavelength routing in optical ring access network(ORAN) is designed and the functions of each field in the frame are defined. In addition, the IP packet transmission to the network layer corresponding to the newly proposed structure of the protocol stack is newly presented. Tha data transmission protocol design techniques of ORAN was proposed. IP packet and broadcasting packet transmission within the sub-network, and the IP packet transmission to other sub-network was shown through the process illustration. In the process, the encapsulation and framing process of the wavelength information to routing has been described in detail. And each step takes place in a packet transfer process is demonstrated. A ring type optical access network protocol is not yet research field. ORAN data transfer protocol to send/receive module structure of a subscriber node and a control node of the two rings which analyzed the results are shown. The high-speed Internet solution is proposed that by using wavelength routing the packet transport protocol for ORAN is designed.

• Journal of KIISE:Information Networking
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• v.30 no.2
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• pp.244-251
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• 2003

As the Internet and wireless mobile communication is being widespread, the WAP (Wireless Application Protocol) that merges these two technologies has emerged. Also, the research of the WAP gateway that enables efficient processing of multiple user demands concurrently and prompt response to requests from various wireless devices has been performed in many working groups. The WAP stack is the most fundamental technology among these researches. In this paper, we implement the WAP container utilizing the JAVA's multithreading and applying to the connection pooling technique to manage the available resource in the container efficiently. Also, we design and implement the WTP(Wireless Transaction Protocol) layer and the UDP(User Datagram Protocol) layer based on the priority Policy. Our design and implementation showed the shorter waiting time than that of the existing FCFS(First-Come, First-Served) system in the transaction layer and its efficiency was proved through simulation.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.36 no.6B
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• pp.728-737
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• 2011

For the real time monitoring and tracking of shipping container which is one of the core objects for global logistics, Wireless Ad-Hoc Network technology might be needed in stacking environments such as ports, yards and ships. In this paper, we propose a container network routing protocol suitable for port or yard stacking environments which include some constraints such as shadow area problem from metal material, frequent movement of container, etc. With this protocol in which a mesh network algorithm is applied, every container data packet can be delivered to the sink node reliably even with frequent join/leave of container nodes. As soon as a node on path gets malfunction, alternative backup path is supported with notice to neighbor node, which makes constant total optimal path. We also verified that the performance of proposed protocol is better than AODV, one of previous major MANet(Mobile Ad-Hoc Network) protocol with a function for alternative path, which says the proposed protocol is better for frequent join/leave and variable link quality.

• Proceedings of the IEEK Conference
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• 2000.11a
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• pp.57-60
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• 2000

In this paper, we describe the implementation of Bluetooth headset. Bluetooth headset sets up link using ACL connection between headset and audio gateway, transfers 64kbps voice using SCO connection. Bluetooth headset implemented in this paper is designed with no HCI, so all protocol stack is implemented in Bluetooth module. We verify the upper layer protocol and application program using C-language modeling on Unix environment.

• Proceedings of the IEEK Conference
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• 2004.06a
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• pp.123-126
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• 2004

Demands on dealing with multimedia data through the network have been increased, and networking multimedia devices require processing, transmitting , and receiving the digital data. In order to implement the network for high performance and low cost, we may have to integrate the dedicated hardware into a system on a chip by spending an extra amount of silicon resource. In this paper, we describe hardware implementation of TCP/IP protocol stack which is now popular to connect multiple PCs and peripherals by means of networks. For evaluation we used ALTERA APEX 20K600EBC652 FPGA with 600,000 gates. The operating frequency is estimated 29.9MHz and it used area of $26\%$.