Earticle

It is absolutely essential to implement advanced IP network technologies such as QoS, Multicast, High Availability, and Security in order to provide real-time services like IPTV via IP backbone network. In reality, the existing commercial networks of internet service providers are subject to certain technical difficulties and limitations in embodying those technologies. On-going research efforts involve the experimental engineering works and implementation experience to trigger IPTV service on the premium-level IP backbone which has recently been developed. This paper introduces the core network technologies that will enable the deployment of a high-quality IPTV service, and then proposes a suitable methodology for application and deployment policies on each technology to lead the establishment and globalization of the IPTV service.

현재의 인터넷 망을 이용하여 음성, 화상 정보를 실시간으로 이용하고자 하는 다양한 응용이 시도되고 있다. 차세대 통신으로 주목 받고 있는 IMT-2000에서도 기존의 회선 교환망 대신 인터넷 망을 이용함으로써 경제성, 관리의 편의성, 새로운 서비스의 창출이 가능한 등의 이점이 있다. 인터넷 망이 최선의 노력(best effort)만을 제공하기 때문에 발생되는 신뢰성과 지연의 문제는 이미 많은 연구가 있어왔고 현재 어느 정도의 서비스 품질을 획득하여 VoIP(Voice Over Internet Protocol)와 같은 서비스가 실제로 이용되고 있다. 그러나 무선 통신의 경우는 이에 더하여 무선 구간에서의 자원 할당의 문제가 남아 있다. 본 연구에서는 코어 망으로 인터넷 프로토콜을 사용하는 차세대 All-IP 망에서, 무선 이동단말 간의 멀티미디어 서비스가 가능하도록 효율적인 주파수 할당을 지원하는 QoS 관리자를 설계하였다. 제안한 QoS(Quality Of Service)관리자는 요구 대역폭이 다른 멀티미디어 호 요청에 대해 융통성 있는 주파수 할당이 가능하도록 대국의 QoS 관리자와의 협상을 통해 제한된 범위 내에서 서비스 품질을 조절하여 보다 많은 호 연결 요청이 성공할 수 있도록 한다.

위성 ATM 망에서 TCP/IP 기반의 응용 서비스를 제공하기 위해서는 위성의 긴 전송지연과 이성 채널의 버스트 오류 특성에 따른 정확한 전송 성능의 영향과 분석이 요구되며, 아울러 성능 목표치가 제시되어야 한다. 본 논문은 2Mbps급 KOREASAT위성을 이용한 위성망과 지상망이 상호 연동된 실제 위성/지상 ATM LANE(LAN Emulation)을 구현하고, 위성 채널의 Eb/No와 TCP 소켓 버퍼 크기, 그리고 전송 메시지 크기를 바꾸어 가면서 그때의 TCP/IP 트래픽과 FTP의 전송성능을 비교 분석하였다. 아울러 IPoA(IP over ATM)기반의 영상회의 서비스에 대한 전송 품질 및 메시지 전달 특성 등을 분석하였다. 연구결과 TCP 소켓 버퍼 크기가 증가할 때 TCP의 전체 성능이 증가함을 알 수 있으나 제한된 최대 윈도우 크기 64kbytes와 위성채널의 오류 특성으로 인해 실제 최대 전송속도는 이론상의 목표치를 달성하지 못함을 보여 주었다. 또한 2Mbps 위성링크에서 Eb/No가 6dB 이하에서는 실제적으로 제공할 수 있는 최대 전송성능의 50%이하로 떨어져 TCP/IP over ATM 서비스가 거의 불가능함을 보여주었다. FTP의 경우, 파일 크기가 작으면 최대 전송속도에 도달하기 전에 파일 전송이 완료되어 대역폭 이용의 효율성 측면에서 TCP/IP의 slow start 메케니즘이 적절하지 않음을 보여주었다. 이울러 IPoA영상회의 서비스에서도 Eb/No가 약 6.5dB 이하에서는 영상이 거의 정지되고, 메시지 전달시간도 ITU에서 권고하는 목표치를 훨씬 상회하여 서비스가 거의 불가능함을 보였다.

Many different types of network equipments are deployed in a large-scale IP network. In this operating environment, network service providers suffer from difficulty in controlling various equipments simultaneously in case network faults happen in their overall or regional network due to physical link failure or abnormal traffic. This paper presents a policy-based methodology to control many different types of network equipments at the same time in abnormal cases. The key idea is that NMS(Network Management System) keeps vendor-neutral control policies in normal times and that when an abnormal case occurs in network, NMS transforms the selected policy into vendor-specific control commands and enforces them to various equipments simultaneously.

Internet traffics for various kinds of contents are growing with more amount of data to provide high-quality information and are required various QoS depending on the characteristics of contents. However, current Internet service supports BE (Best Effort) service only, therefore IntServ (Integrated Service) scheme and DiffServ (Differentiated Service) scheme are represented to support QoS in IP layer. This paper describes new scheme that provides QoS taking into account the traffic characteristics over Mobile IPv6 network based on IEEE 802.11e by decreasing signal process time using traffic class of DiffServ and MAC and evaluates the performance through computer simulation.

본 연구는 정적 라우팅과 동적 라우팅의 장점을 활용하여 최단 거리를 산정하는 하이브리드 방식의 라우팅 기법이다. 네트워킹은 휴먼 펙터에 의해 결정이 되기 때문에, 네트워크 트래픽은 항상 특정 시간에 몰리게 되고 네트워크 트레픽 레코드를 분석하면 각 시간대별로 네트워크 트레픽 추측이 가능하다. 따라서 RIP의 잦은 정보 교환으로 인해 발생되는 부하를 줄여 IP 네트워크에서 최단 경로를 산정하는 것이 이 논문이 목적이다.

There are many algorithms to improve the network traffic and to avoid losing packets in the network. This paper proposed determining the shortest paths for hops, which are in the middle of the source and destination. The shortest path in this paper means the fastest path between them. Recently, dynamic routing algorithm is currently used now but this paper suggests the fastest paths between the source and the destination is by using the record of the network traffic history. People are using the networking and the network traffic is always corresponding to how many people use the networking in specific time. Therefore, I can predict the network condition by referring to the history of network traffic record, and then the shortest path can be produced without using RIP too much. It will be helpful to improve the network traffic.

The development of cultural industry has been widely concerned in the world, and is increasingly playing a huge economic value in the development of modern society. With the deepening of economic globalization, cultural industry can not only bring economic benefits, but also play an increasingly prominent role in promoting national influence. Therefore, the development of cultural industry has become the focus of most countries. Many countries have formulated corresponding cultural industry policies, which provide strong institutional guarantee and support for the development of cultural industry, thus increasing the international influence of their cultural industry. China also attaches great importance to the development of cultural industry and provides policy support. This has given policy support to the development of China's cultural industry and Chinese film and television productions going global. It is not difficult to see that the Chinese government speeds up the strategic layout of the cultural industry, takes film and television works as the carrier, promotes Chinese film and television works to go out and spread Chinese culture, and tells Chinese stories well through film and television works, thus increasing the influence of Chinese culture in the world and China's cultural soft power. In recent years, the concept of IP has entered the film and television culture industry and become a hot word in the film and television industry. The number of TV series adapted from network literature has soared, so the massive content of network literature has become an indispensable script material for TV series creation. Under the role of market economy, the injection of capital has strongly impacted the creation of TV series and online literature, and the IP industry chain has been formed. Because of this, IP TV series has been widely concerned, gained a large number of fans, popular screen. In this context, many IP TV dramas in China have gone abroad smoothly and achieved some success, and many of them have been widely recognized in South Korea. The year 2021-2022 is the year of cultural exchange between Korea and China, which marks the 30th anniversary of the establishment of diplomatic relations between the two countries. As the two countries seek closer cultural exchanges to resolve unresolved political issues, it is a good opportunity for Chinese TV dramas to be exported to Korea. This is the backdrop for a large number of Chinese dramas to be exported to Korea. Therefore, this paper takes the current situation and success factors of Chinese IP teleplay export to South Korea as an example, discusses the strategy of Chinese teleplay export to South Korea, and provides some constructive suggestions for Chinese teleplay export to South Korea. The Chinese government can take Chinese TV plays as the carrier to go out, so as to increase the influence of Chinese culture in the world and the country's cultural soft power.

ITS용 WSN과 같이 작고 건전지로 동작하는 송신 노드에서는 MCU의 성능이 낮고 메모리의 크기도 충분하지 않으며 소비전력을 줄이는 것이 매우 중요하다. 본 논문에서는 이런 환경에서 TCP/IP 통신을 할 때에 사용되는 TCP헤더 옵션필드와 추가적인 체크섬 필드를 이용하여, 전송하는 데이터의 크기가 메모리의 크기에 제한을 받지 않고, 데이터 처리 시간과 소비전력을 감소시키는 방식이 제안되고 성능이 분석되었다.

The transmitting node in WSN for ITS would be small and operated by battery, and the MCU in the node would be low speed with small sized memory and low power consumption. In this paper, the post-checksum method in which the checksum field is added to the tail of the TCP segment for ITS applications, is proposed to reduce data processing time and power consumption, and so there is no limitation of the transmitting data size.

토르는 온라인 검열에 저항할 수 있는 익명성을 획득하고 트래픽 분석으로부터 보호 받을 수 있는 저지연 개방형 네트워크 중 하나이다. 따라서, 사적인 인터넷 활동에 참여하기를 원하는 사용자들에게 유용한 툴로 알려져 있다. 토르 네트워크에 대한 익명성을 저해하거나 파괴하기 위해 다양한 패시브 및 액티브 공격 기법들이 제안되어 왔으며, 이러한 직접적 공격 기법들 이외에 어플리케이션에서의 취약점으로 인해 토르 사용자의 신원이 노출될 수도 있다. 이러한 취약한 어플리케이션 중 하나는 비트토런트이다. 본 논문에서는 토르 상에서 비트토런트 사용자의 실 IP 주소를 노출시킬 수 있는 몇 가지 공격 방법에 대한 분석을 수행하였으며 각각의 기법에 대한 장단점을 비교, 분석하였다.

Tor is a popular low-latency open network that helps to defend against traffic analysis and achieves anonymity for resisting online censorship. So, it is a useful tool for those users who want to participate privately in the Internet. Different passive and active attacking schemes had been proposed to break the anonymity of Tor network. However, apart from these methods, vulnerability in application can also deanonymize Tor user. One of such vulnerable applications is BitTorrent. In this paper, several attacks targeting BitTorrent users on top of Tor that reveal their real IP address are reviewed. The advantages and disadvantages of each scheme are also discussed with comparing.

인터넷 프로토콜(IP)을 기반으로 음성, 오디오, 비디오 및 데이터 등의 다양한 멀티미디어 통신을 제공 할 수 있는 서비스 플랫폼이 IMS(IP Multi-Media Subsystem)이다. 기업에서는 기존 통신환경을 최대한 유지하면서 최소의 비용으로 다양한 멀티미디어 서비스를 제공하기 위해 꼭 필요한 IMS 융합 서비스만 도입하는 것이 효과적이다. 그러 므로 본 논문에서는 직원이 1,000명 이하의 기업이 IMS 솔루션을 효과적으로 구축하기 위한 방안으로 IMS 코어 메인 시스템을 개발 하였다. 본 시스템은 IMS 서비스와 연동하여 IMS단말과 CSCF(Call Session Control Function) 중간 에 위치하고, IMS단말에 대응해서는 CSCF 역할을, CSCF에 대응해서는 IMS 단말의 기능을 제공하게 된다. 또한 유 선전화, SIP폰 등 기존에 기업에서 사용하던 단말기들은 게이트웨이를 이용하여 연동하게 된다.

Service platform which can offer various multimedia communication as the video, audio, voice and data is IMS(IP Multi-Media Subsystem). It is effective in the company is introducing only such convergence IMS　 services to be required　to provide various multimedia services at the lowest cost and existing communication environment while keeping the maximum Therefore, in this study, we had developed IMS 코어 main system that not more than 1,000 employees of companies can effectively establish IMS solutions. This system is located at the middle between IMS terminal and CSCF(Call Session Control Function) in line with IMS services and provides CSCF in response to the IMS terminal and IMS terminal in response to the CSCF. As well, corded telephone and SIP phone which were used as terminal is linked with gateway.

The purpose of this article is to design a multimedia streaming system with a complex structure as the one with a simple and basic work structure and realize system design that can enhance both expandability and portability based on that structure. To solve the problem that it is too complex and has low expandability, this study suggests a system design structure based on the LTS (Linear Task Set) model. Based on the simple, basic structure grounded on LTS structure, the study defines a consistent process and allows free structure alteration in the simple system structure according to the service purpose and demand. To secure independence and simplicity among components, the study defines a port channel object of a singleton structure and realizes design that can allow stream transmission and overall stream monitoring on the system for all ports with the port channel based on the mapping information of a component port. And based on this model, the paper suggests a component system model that can realize multimedia streaming service.

IP based network public address (PA) is an audio management system that provides high flexibility in reconfiguration, system expansion, and requires much simplified cabling structure. This translates to significant cost saving in installation cost, both labour and material, as it requires less cabling, reduced cable size, conduit size, and trunking size. The network PA works very much similarly to computer networks where packets of data are transmitted from one node to another with each of them having a unique IP address in the network system. The nodes will then only pick up the packets that solely addressed to them. The network PA can also be integrated with other building services or subsystems that are TCP/IP compliant such as the fire alarm management system, CCTV system, and building management system to provide instantaneous voice assisted response and feedback from each system.