• 한국정보처리학회논문지
• /
• 제6권11S호
• /
• pp.3229-3242
• /
• 1999

At recent, the Internet is evolving into the directions which is capable of incorporating stream-type services such as voice and video services due to the remarkable growth of WWW service and the development of new multimedia application services. However, the existing Internet can only support a best-effort delivery model and thus it is difficult to satisfy these requirements as well as to provide the QoS beyond a certain degree. Accordingly, it is imperative to develop QoS-based routing algorithm in order to allow flexible routing by the Internet user's QoS demand and to be applied into wide area networks. In this paper, we presented new routing algorithms for next generation Internet services and made performance evaluations. The proposed algorithms allow the routing by the user's QoS demand level in order to provide the diverse Internet application services based on ATM network environment that is expected to play a role as an infrastructure of next Generation Internet Services.

• 품질경영학회지
• /
• 제35권3호
• /
• pp.37-46
• /
• 2007

Our society is increasingly dependent on the Internet, and this trend will be accelerating in the ear of All-IP convergence. As the core infrastructure of the All-IP convergence, the next generation Internet should enable end-to-end Quality of Service(e2e QoS). For that purpose, major international standardization institutes such as ITU(International Telecommunication Union) and IETF(Internet Engineering Task Force) are building the concept and architecture of the Next Generation Network(NGN). However, these institutes focus only on technical issues, and leave many business/policy-oriented challenges unresolved. For example, the standards raised by ITU assume that the entire service delivery process for e2e QoS services is perfectly working. But required is a standardized business interface and process for seamless inter-operations across many stakeholders including ISPs(Internet Service Providers), CPs(Content Providers), so on. On the other hand, TMF(TeleManagement Forum) and QuEST(Quality Excellence for Suppliers of Telecommunication) Forum, global consortiums of telecom operators and vendors, present sets of interface rules and process which playa crucial role as de facto standards: for example, NGOSS/eTOM and TL9000 authorization system. However, these standards focus on telephone services, and provide little principle for the next generation Internet. Our study seeks a way to combine these two strains for a successful implementation of NGN. In particular, we find a missing link in the NGN architecture and the elements that could be complemented with the help of NGOSS/eTOM and TL9000. Finally, presented is a strategic direction that our standardization policy should purse in order to reinforce our global leadership for the next generation Internet.

• KSII Transactions on Internet and Information Systems (TIIS)
• /
• 제13권6호
• /
• pp.2964-2985
• /
• 2019

Global data center IP traffic is expected to reach 20.6 zettabytes (ZB) by the end of 2021. Intra-data center networks (Intra-DCN) will account for 71.5% of the data center traffic flow and will be the largest portion of the traffic. The understanding of traffic distribution in IntraDCN is still sketchy. It causes significant amount of bandwidth to go unutilized, and creates avoidable choke points. Conventional transport protocols such as Optical Packet Switching (OPS) and Optical Burst Switching (OBS) allow a one-sided view of the traffic flow in the network. This therefore causes disjointed and uncoordinated decision-making at each node. For effective resource planning, there is the need to consider joining the distributed with centralized management which anticipates the system's needs and regulates the entire network. Methods derived from Kalman filters have proved effective in planning road networks. Considering the network available bandwidth as data transport highways, we propose an intelligent enhanced SDN concept applied to OBS architecture. A management plane (MP) is added to conventional control (CP) and data planes (DP). The MP assembles the traffic spatio-temporal parameters from ingress nodes, uses Kalman filtering prediction-based algorithm to estimate traffic demand. Prior to packets arrival at edges nodes, it regularly forwards updates of resources allocation to CPs. Simulations were done on a hybrid scheme (1+1) and on the centralized OBS. The results demonstrated that the proposition decreases the packet loss ratio. It also improves network latency and throughput-up to 84 and 51%, respectively, versus the traditional scheme.

• 한국컴퓨터정보학회논문지
• /
• 제25권4호
• /
• pp.87-95
• /
• 2020

본 논문에서는 향후 네트워크 서비스의 발전 및 네트워크 대역폭 확대에 따른 현재의 인터넷이 가지고 있는 문제점을 살펴보고 이를 고도화할 수 있는 방안에 대해 제안한다. 현재의 인터넷은 TCP/IP로 구성되어 오랜 시간 사용되어 왔으나 대역폭, 전송량, 보안 등의 근본적인 문제가 해결되지 않아 지속적인 투자 및 유지보수를 통해 미래 네트워크를 대비하여야 한다. 이를 극복하기 위해 현재의 인터넷 프로토콜을 차세대 네트워크로 변환하여 이러한 문제를 극복하고 고도화할 수 있는 방안을 제시하고자 한다. 현재 차세대 네트워크에 대한 많은 연구가 이루어지고 있으나 국내에는 이러한 연구가 많이 이루어지지 않고 있으며 국가적인 차원에서 미래의 인터넷 서비스 산업 발전을 위해 차세대 네트워크에 대한 연구는 매우 중요한 과제일 것이다. 본 논문에서는 다양한 차세대 프로토콜을 통한 장점을 통해 고도화된 인터넷 환경을 제안하고자 한다.

• 한국정보통신학회논문지
• /
• 제5권6호
• /
• pp.1038-1044
• /
• 2001

현재 정도통신시장의 추세는 유선의 무선화 현상과 데이터서비스의 급성장이라는 양축으로 압축하여 설명할 수 있다. 인터넷의 등장과 이의 급격한 파급은 전세계를 하나로 묶고 있고, 정보화 추 축의 정도가 국가의 경쟁력을 좌우하는 중요한 잣대가 되고 있다. 이러한 시점에서 통신 및 타 산업의 경쟁력 및 국가 기반의 체질적 강화를 위해서는 차세대 인터넷의 조기구축과 정착이 요구되고 있다. 따라서 본 논문에서는 현재 인터넷 환경의 변화를 살펴보고, 현재 인터넷의 한계와 문제점 을 질어된 후 차세대 인터넷의 개요를 파악하고자 한다. 그리고 차세대 인터넷의 대표주자격인 광인터넷의 정의와 기술현황 및 진화방향을 개괄해보고, 광인터넷의 성공적 구현을 위한 정책적 시사점을 조망해보고자 한다.

• KSII Transactions on Internet and Information Systems (TIIS)
• /
• 제12권8호
• /
• pp.3946-3965
• /
• 2018

Network anomaly detection in Software Defined Networking, especially the detection of DDoS attack, has been given great attention in recent years. It is convenient to build the Traffic Matrix from a global view in SDN. However, the monitoring and management of high-volume feature-rich traffic in large networks brings significant challenges. In this paper, we propose a moving window Principal Components Analysis based anomaly detection and mitigation approach to map data onto a low-dimensional subspace and keep monitoring the network state in real-time. Once the anomaly is detected, the controller will install the defense flow table rules onto the corresponding data plane switches to mitigate the attack. Furthermore, we evaluate our approach with experiments. The Receiver Operating Characteristic curves show that our approach performs well in both detection probability and false alarm probability compared with the entropy-based approach. In addition, the mitigation effect is impressive that our approach can prevent most of the attacking traffic. At last, we evaluate the overhead of the system, including the detection delay and utilization of CPU, which is not excessive. Our anomaly detection approach is lightweight and effective.

• 한국IT서비스학회지
• /
• 제7권1호
• /
• pp.131-149
• /
• 2008

Bandwidth Trading(BT) represents a potential market with over 1 trillion USD across the world and high growth potential. BT is also likely to accelerate globalization of the telecommunications industry and massive restructuring driven by unbundling rush. However, systematic researches on BT remain at an infant stage. This study starts with structure analysis of the Internet industry, and discusses significance of Internet interconnection with respect to BT Issues. We also describe the bandwidth commoditization trends and review technical requirements for effective Internet interconnection with BT capability. Taking a step further, this study explores the possibility of improving efficiency of network providers and increasing user convenience by developing an architectural prototype of Hub-&-Spoke interconnection model required to facilitate BT. The BT market provides an Innovative base to ease rigidity of two-party contract and Increase service efficiency. However, as fair, efficient operation by third party is required, this research finally proposes an exchanging hub named NIBX(New Internet Business eXchange).

• 한국정보처리학회논문지
• /
• 제6권11S호
• /
• pp.3309-3319
• /
• 1999

Seamless end-to-end Internet Quality of Service (QoS) management is very only because Internet Management is not well understood and practiced in the real world but because the nature of the Internet is hard to predict and manage. Secure transmission, transport reliability, ability to differentiate service qualities, QoS-based intelligent routing, QoS monitoring, and customer-oriented service management are essential technical huddles to be coped with. Despite of these difficulties, the Internet becomes the platform of choice for the next generation applications and services. without a solid management solution, it is not easy to deploy high quality commercial services. In this paper, we propose an architecture of seamless end-to-end Internet QoS Management System and describe the design principles and system components of our developing prototype system.

• KSII Transactions on Internet and Information Systems (TIIS)
• /
• 제13권11호
• /
• pp.5673-5691
• /
• 2019

Information centric mobile network can significantly improve the data retrieving efficiency by caching contents at mobile edge. However, the cache pollution attack can affect the data obtaining process severely by requiring unpopular contents deliberately. To tackle the problem, we design an algorithm of mitigating cache pollution attacks in information centric mobile network. Particularly, the content popularity distribution statistic is proposed to detect abnormal behavior. Then a probabilistic caching strategy based on abnormal behavior is applied to dynamically maintain the steady-state distribution for content visiting probability and achieve the purpose of defense. The experimental results show that the proposed scheme can achieve higher request hit ratio and smaller latency for false locality content pollution attack than the CacheShield approach and the baseline approach where no mitigation approach is applied.

• 한국정보통신학회논문지
• /
• 제10권12호
• /
• pp.2166-2172
• /
• 2006

인터넷의 활성화와 인트라넷 구축을 통한 그룹웨어의 확산과 함께 LAM의 초고속화 기술이 급진적으로 발전되어 왔으며, 이러한 발전은 고품질의 실시간 서비스에 대한 사용자의 요구에 의해 새로운 형태의 통합네트워크 형태로 발전되어 가고 있다. 통합네트워크는 데이터, 음성 및 영상 응용 서비스가 함께 제공될 수 있는 통신망으로서 궁극적으로는 통합된 단일 네트워크 플랫폼으로 발전해 갈 것으로 보인다. 본 논문에서는 IP기반의 통합서비스를 제공하기 위하여 실질적인 GoS 제공 기술, 프로그래머블 스위치 네트워크 구조 기술과 통합 호 제어 처리 기술을 포함하는 차세대 통합 LAN에 관한 연구결과를 제시하고자 한다.