• Proceedings of the Korean Information Science Society Conference
• /
• 2003.04d
• /
• pp.503-505
• /
• 2003

패킷망을 통해 음성, 영상, 데이터를 동시에 제공할 수 있는 차세대 네트워크(NGN) 개념이 제안되어 현재 네트워크 상에 전개되어 가고 있다. 하지만 NGN의 Softswitch의 구성을 위해서는 현재의 PSTN 내의 Class 4/5 switch를 NGN의 구성에 맞게 끔 Access Gateway 및 Media Gateway로 교체해 나가야 하며 교체 후에도 소비자의 새로운 서비스 신설 요구에 신속하게 부합하기 위하여 기존 시스템의 서비스 중단없이 새로운 서비스 및 신규 프로토콜을 신속히 전개할 수 있는 개념은 필수적인 요소가 되었다. 이러한 점을 지원하기 위하여 본 논문에서는 개방형 네트워크 아키텍처 접근 방식인 Active Network의 개념을 응용한 차세대네트워크 Media Gateway Controller내의 이산 메커니즘 적용 Active Packet Processor도입하였다.

• Journal of the Korea Institute of Information and Communication Engineering
• /
• v.11 no.12
• /
• pp.2265-2270
• /
• 2007

This paper discusses a tester of functionality and call processing performance, based on the MEGACO/H.248 protocol that both IETF and ITU-T recommend as a media gateway control protocol, of both a media gateway controller and an access gateway which constitute a next generation convergence network. Effective methods, a functional architecture and implementation for such testification are provided. Especially included are not only a virtual emulation function of analog subscriber lines connecting to an access gateway, but also a tester emulated as a counter system of the protocol for the testifying a media gateway controller and an access gateway system.

• Proceedings of the Korea Information Processing Society Conference
• /
• 2009.04a
• /
• pp.7-10
• /
• 2009

본 연구에서는 차량 네트워크를 구성하는 CAN(Controller Area Network), MOST(Media Oriented System Transport)등의 버스 시스템을 중심으로 IVN(In-Vechicle Network)에 대한 선행연구와 지능형 통합 Gateway 개발 연구를 통해 통합적인 차량 상태정보 수집 및 교환을 위한 차량 Gateway를 제시하고, Soc(System on Chip)형태의 차량용 인터페이스(HMI, Human Machine Interface)를 통한 지능형 통합 GateWay 통신 기술을 OSGi의 번들 형태로 제작하여 알아본다.

• Proceedings of the Korean Information Science Society Conference
• /
• 2004.04a
• /
• pp.787-789
• /
• 2004

MEGACO(MEdia GAteway COntro) 프로토콜은 VoIP(Voice over IP) 시스템에서 MGC(Media Gateway Controller)와 MG(Media Gateway)간에 통신을 정의하는 표준이다. MEGACO 명세서에는 통신규약에 대한 내용을 ABNF (Argumented BNF)형식으로 제공하고 있으나, 이것을 그대로 사용하여 MEGACO 메시지를 분석하는 파서(Parser)를 개발하기에는 많은 어려움이 있다. 규칙(rule)과 규칙간의 비결정적인 요소와 토큰과 토큰간의 모호성이 많이 존재하기 때문에 적절한 변환을 통하여 파서를 제작하여야 한다. 본 논문에서는 ANTLR 파서 생성기와 MEGACO 명세서에서 제공되는 ABNF문법을 사용하여 MEGACO 파서(Parser)를 개발하였다. ANTLR에서 제공하는 Syntactic predicate와 Semantic Predicate등을 적절하게 사용하여 명세서에 존재하는 여러 가지 형태의 비결정적인 구문과 모호한 토큰들을 제거하였다.

• Proceedings of the Korea Information Processing Society Conference
• /
• 2002.11b
• /
• pp.1515-1518
• /
• 2002

인터넷 서비스의 수요가 급증함에 따라 통신서비스 제공기업에서도 VoIP 시스템 도입의 중요성이 부각되고 있다. PSTN 교환기는 호 처리 기능과 회선 스위칭 기능이 하나로 결합된 단일 시스템인 반면, VoIP 시스템에서의 MGC 는 하드웨어 부분과 소프트웨어 부분을 물리적으로 분리하고 둘 사이의 인터페이스를 표준 프로토콜을 적용한 것이다. 이때 MG(Media Gateway)는 회선 스위칭 기능을 담당하고 MGC(Media Gateway Controller)는 호 처리 기능을 수행한다. 최근 국내 외 업체들에서는 VoIP 시스템 제공이 시작되고 있으나 국내 IP 기반 통신서비스 제공업체에서는 VoIP 시스템 제공이 미흡한 실정이다. 본 논문에서는 VoIP 시스템에서 MGC 간 라우팅 방법을 최적화 함과 동시에 사용자들에게 다양한 서비스를 제공할 수 있는 라우팅 방안을 제시하고자 한다.

• International journal of advanced smart convergence
• /
• v.7 no.4
• /
• pp.50-56
• /
• 2018

The Internet of Things (IoT) and Visible Light Communication (VLC) is opening up new services in lighting industry by integrating sensory network features in addition to standard illumination functionality. In this progressive developments, the next generation lighting devices for smart homes are capable to sense the environmental conditions and transfer the captured data through lights to gateway controller to access remotely. The smart home environmental sensor information's are few kbps only so VLC systems need to built-in with low rate light connectivity to transfer data to the gateway. To provide error free communication, the quality of a received light signal is important to be considered when designing an VLC receiver. Therefore, this paper proposes the design of robust low rate IoL receiver design using NCP302 voltage detector for micro controller to adapt the IoT/IoL front end module for system integration. To evaluate the proposed system performance, the Arduino UNO based IoT/IoL controller designed with lighting, sensors and lights connectivity interfaces. The experimental result shows that the robust interference rejection is feasible on proposed VOL receiver and possible to have an error-free communication up to 10 kbps at a low SNR using OOK modulation.

• Proceedings of the IEEK Conference
• /
• 2005.11a
• /
• pp.113-118
• /
• 2005

Softswitch is the core BcN equipment which voice and multimedia switching based on the IP Technologies. It is designed to replace the Class 5(local Exchange) and Class 4(Toll Exchange) switch based on the circuit wired and wireless switching network technologies. Softswitch gets its name because typically it is a software based solution implemented on general purpose computers/servers. While the traditional PSTN switches are rely on dedicated facilities for T and S inter-connection and are designed primarily for voice communications. Packet based Softswitch is divided the control of call and bearer, very different from Public telephone network. Sometimes Call Agent or Media Gateway Controller, a key component in the VoIP solution, is also called Softswitch. This paper will suggest the software architecture of softswitch for performance in call processing part, also suggest the session management model to cover call setup latency.

• International journal of advanced smart convergence
• /
• v.6 no.1
• /
• pp.76-81
• /
• 2017

This paper presents a low cost and flexible IoT enabled smart LED controller using Arduino that is used for emergency exit signs. The Internet of Things (IoT) is become a global network that put together physical objects using network communications for the purpose of inter-communication of devices, access information on internet, interaction with users as well as permanent connected environment. A crucial point in this paper, is underlined on the potential key points of applying the Arduino platform as low cost, easy to use microcontroller with combination of various sensors applied in IoT technology to facilitate and establishment of intelligent products. To demonstrate the feasibility and effectiveness of the system, devices such as LED strip, combination of various sensors, Arduino, power plug and ZigBee module have been integrated to setup smart emergency exit sign system. The general concept of the proposed system design discussed in this paper is all about the combination of various sensor such as smoke detector sensor, humidity, temperature sensor, glass break sensors as well as camera sensor that are connected to the main controller (Arduino) for the purpose of communicating with LED exit signs displayer and dedicated PC monitors from integrated system monitoring (controller room) through gateway devices using Zig bee module. A critical appraisal of the approach in the area concludes the paper.

• Journal of KIISE:Computing Practices and Letters
• /
• v.11 no.1
• /
• pp.92-99
• /
• 2005

In this paper, we present a high-level design methodology applied on a network system-on-a-chip(SOC) using SystemC. The main target of our approach is to get optimum performance parameters for high network address translation(NAT) throughput. The Fast Ethernet media access controller(MAC) and its direct memory access(DMA) controller are modeled with SystemC in transaction level. They are calibrated through the cycle-based measurement of the operation of the real Verilog register transfer language(RTL). The NAT throughput of the model is within $\pm$10% error compared to the output of the real evaluation board. Simulation speed of the model is more than 100 times laster than the RTL. The validated models are used for intensive architecture exploration to find the performance bottleneck in the NAT router.