• Journal of Korean Institute of Industrial Engineers
• /
• v.34 no.2
• /
• pp.205-215
• /
• 2008

convergence networks (BcN). The problem seeks to minimize the total cost of switch and cable while satisfying the requirement of demand and quality of service (QoS). We develop mixed integer programming models to obtain the optimal switch location of the access network. We develop a Tabu Search (TS) heuristic algorithm for finding a good feasible solution within a reasonable time limit. We propose real networks with up to 25 nodes and 180 demands. In order to demonstrate the effectiveness of the proposed algorithm, we generate lower bounds from nonlinear QoS relaxation problem. Computational results show that the proposed heuristic algorithm provides upper bounds within 5% optimality gap in 10 seconds.

• 한국정보통신설비학회:학술대회논문집
• /
• 2007.08a
• /
• pp.92-99
• /
• 2007

현재 통신 시장은 보다 편리하고 다양한 서비스를 찾는 소비자의 욕구와 맞물려 TPS(Triple Play Service) 방향으로 급속히 나아가고 있다. 인터넷 전화의 보급은 이미 보편적 서비스가 된 초고속인터넷 서비스와 연계하여 빠르게 확산되고 있으며, 2007년 들어 방송서비스까지 결합한 TPS에 대한 통신사업자간 경쟁이 본격화되고 있는 추세이다. 트리플 플레이 서비스(Triple Play Service;이하 TPS)는 초고속 인터넷과 인터넷 전화와 방송 서비스를 하나의 회선으로 제공하는 종합 인터넷 서비스로, 광대역 통합망(BcN; Broadband Convergence Network)의 핵심 서비스이다. 액세스 스위치(Access Switch) 단은 TPS로 인해 더욱 많은 역할을 담당할 것으로 전망되는데, 디지털 방송을 인터넷 프로토콜을 통해 전송하기 위한 멀티캐스트 기능과 혼재된 이종간의 디지털 신호를 각 서비스의 품질에 맞게 보장해 주는 QoS(Quality of Service) 기능이 무엇보다 중요하게 고려 되어야 한다. 본 논문에서는 TPS의 핵심일 수 있는 방송 서비스를 위해 액세스 스위치 단에서 제공해야 할 멀티캐스트와 QoS 기능 구현 방안에 대해 제시한다

• Journal of Internet Computing and Services
• /
• v.22 no.6
• /
• pp.129-140
• /
• 2021

The next generation mBcN should be built to cooperate with the wireless network to support hyper-speed and hyper-connectivity. In this paper, we propose a network architecture for the cooperation mBcN and 5G commercial network and architecture of the cooperative security gateway required for the cooperation. The proposed cooperative security gateway is between gNB and UPF to support LBO, SFC, and security. Our analysis shows that the proposed architecture has several advantages. First of all, user equipment connected with the mBcN can be easily connected through the 5G commercial radio network to the mBcN. Second, the military application traffic can be transmitted to mBcN without going through the 5G core network, reducing the end-to-end transmission delay without causing the traffic load on the 5G core network. In addition, the security level of the military application can effectively be maintained because the user equipment can be connected to the cooperative security gateway, and the traffic generated by the user equipment is transmitted to the mBcN without going through the 5G core network. Finally, we demonstrate that LBO, SFC, and security modules are essential functions of the proposed gateway in the 5G test-bed environment.

• The Journal of Korean Institute of Communications and Information Sciences
• /
• v.33 no.9B
• /
• pp.802-812
• /
• 2008

This paper proposes QoS Model which has tested and analyzed the capabilities of provisioning multimedia service in high speed Internet environment. We have tested quality measurement test for VoIP/MoIP, VoD, IPTV services and analyzed the level of QoS and QoS degradation by constructing test laboratory consisted of 46 subscribers which provided by 3 telecom operators. Besides, We propose QoS Model to apply for BcN application based on analysis result and prove proposed model by constructing test lab in KOREN environment. It is expected that telecom will use this results as a valuable information to construct All-IP network based on NGN(NGN:Next Generation Network).This paper proposes QoS Model which has tested and analyzed the capabilities of provisioning multimedia service in high speed Internet environment. It is expected that telecom will use this results as a valuable information to construct All-IP network based on NGN.

• Proceedings of the IEEK Conference
• /
• 2005.11a
• /
• pp.167-170
• /
• 2005

We performed field test and analyzed results of field test in variable HFC(Hybrid Fiber Coaxial) network environments. And we investigated whether the test results is satisfied in DOCSIS(Data-over-Cable Service Interface Specification) 2.0 and OpenCable standard. Also, we propose HFC improvement problem for HFC Network quality as BcN(Broadband convergence Network) access network. We tested three sample areas. The sample areas represent various type of SO(System Operator) in korea. The field test was to measure signal level about digital channels. In results of multiple digital channels, in case of "Equalizer ON", we could be obtained very good test results. The results of field test were shown in satisfying recommended values in DOCSIS 2.0 and OpenCable. So, we could have confidence through field test that BcN will be possible to be adapted to environment of korea HFC network.

• 한국IT서비스학회:학술대회논문집
• /
• 2007.11a
• /
• pp.386-391
• /
• 2007

개방형 서비스개발자들은 SCE(service Creation Environment) 도구를 사용하여 망에 대한 전문적인 지식이 없더라도 예전보다 쉽고 빠르게 서비스를 개발할 수 있게 되었다. 본 논문에서는 툴킷 라이브러리 형태의 SCE를 제공하는 방법을 제안한다. SCE 툴킷 라이브러리는 SCE를 SDK((Software Development Kit) 형태로 제공한다. 이는 기존의 IDE(Integrated Development Environment) 환경에 라이브러리 형식으로 SCE 기능을 추가할 수 있게 함으로써, 개발자가 기존에 사용하던 친숙한 환경에서 서비스를 개발할 수 있도록 해준다. 또한 Parlay X API, 웹 2.0 API, 유틸리티 API를 제공하는데 있어서 복잡한 API 및 파라미터를 추상화하여 제공하는 방법을 제안한다. 이러한 SCE 툴킷 라이브러리는 창조적인 새로운 서비스의 출현에 많은 기여를 할 것으로 전망된다.

• Journal of the Korea Institute of Information and Communication Engineering
• /
• v.12 no.4
• /
• pp.670-676
• /
• 2008

There is a difficult plane letting a security threat to occur in Internet networks as VoIP service uses technology-based the Internet is inherent, and you protect without adjustment of the existing security solution or changes with real-time service characteristics. It is a voice to single networks The occurrence security threat that it is possible is inherent in IP networks that effort and cost to protect a data network only are complicated relatively as provide service integrated data. This paper about various response way fields to be able to prevent analysis regarding definition regarding VoIP spam and VoIP spam technology and VoIP spam.

• The KIPS Transactions:PartC
• /
• v.12C no.6 s.102
• /
• pp.773-780
• /
• 2005

Recently, the telecommunication network is in a transition toward the BcN (Broadband convergence Networks) that integrates the Internet, the telecommunication and the broadcasting. The BcN makes it possible to provide of 4he third-party application by using the Open API The Parlay X API is an example of the Open API and the Parlay X API is grafted in the Web Service and is abstracted from the Parlay API. So, the Parlay X API does not only have advantages of a Web Service, but also disadvantages of the Web Service. The main disadvantage of the Web Service is that it does not support the any QoS mechanism. In this paper, we propose the architecture that solves the reliability among the QoS issues for the Web Service. The proposed mechanism adopts the Asynchronous architecture for the reliable Web Service and improves the performance of the retransmission between the client and the server using the expected response time. We perform the performance evaluation through the simulation in older to compare with the existing mechanism. Consequently, we can confirm that the performance of the proposed mechanism performs better than the existing mechanism.

• Journal of Communications and Networks
• /
• v.8 no.4
• /
• pp.410-421
• /
• 2006

In this work, we propose an analytic framework for dimensioning the link capacity of broadband access networks which provide universal broadband access services to a diverse kind of customers such as patient and impatient customers. The proposed framework takes into account the flow-level quality of service (QoS) of a connection as well as the packet-level QoS, via which a simple and systematic provisioning and operation of the network are provided. To that purpose, we first discuss the necessity of flow-aware network dimensioning by reviewing the networking technologies of the current and future access network. Next, we propose an analytic model for dimensioning the link capacity for an access node of broadband convergence networks which takes into account both the flow and packet level QoS requirements. By carrying out extensive numerical experiment for the proposed model assuming typical parameters that represent real network environment, the validity of the proposed method is assessed.

• 제어로봇시스템학회:학술대회논문집
• /
• 2005.06a
• /
• pp.1586-1589
• /
• 2005

GUMF (Global User Management Framework) that is proposed in this research can be applied to next generation network such as BcN (Broadband convergence Network), it is QoS guaranteed security framework for user that can solve present Internet's security vulnerability. GUMF offers anonymity for user of service and use the user's real-name or ID for management of service and it is technology that can realize secure QoS. GUMF needs management framework, UMS (User Management System), VNC (Virtual Network Controller) etc. UMS consists of root UMS in country dimension and Local UMS in each site dimension. VNC is network security equipment including VPN, QoS and security functions etc., and it achieves the QoSS (Quality of Security Service) and CLS(Communication Level Switching) functions. GUMF can offer safety in bandwidth consumption attacks such as worm propagation and DoS/DDoS, IP spoofing attack, and current most attack such as abusing of private information because it can offer the different QoS guaranteed network according to user's grades. User's grades are divided by 4 levels from Level 0 to Level 3, and user's security service level is decided according to level of the private information. Level 3 users that offer bio-information can receive secure network service that privacy is guaranteed. Therefore, GUMF that is proposed in this research can offer profit model to ISP and NSP, and can be utilized by strategy for secure u-Korea realization.