• Journal of KIISE:Computing Practices and Letters
• /
• v.6 no.2
• /
• pp.254-264
• /
• 2000

The billing techniques to support multiple services in an ATM based broadband access network have been rarely developed. In fact, the management techniques including accounting management have only focused on a single service environment such as PSTN thus far. In this paper, we present an accounting management system, called rtFAMS, designed and implemented to provide multiple Value Added Service Providers (VASPS) the charging records for the multiple services in a broadband access network. The architecture is based on OSI system management infrastructure and TMN Q3 interface to acquire accounting information from agents in the ATM cross-connecters as well as to process the billing mechanisms in the manager. This system Is designed to actively adopt the rapidly changing service environments and B-ISDN network management techniques. It also provides real-time accounting information to users using Web in addition to supplying the billing records to VASPs.

• Journal of the Institute of Convergence Signal Processing
• /
• v.6 no.4
• /
• pp.176-181
• /
• 2005

This paper presents an equal bit rate control algorithm utilizing the statistical change between the previous frame and the current frame. The previous studies on the model-based rate control have focused on the models of bit rate and distortion in types of coders, in terms of the quantization parameter. The proposed algorithm improves the typical model-based rate control by updating a model parameter instead of modeling a better model of the rate and distortion. The proposed algorithm updates this model parameter by recognizing the change in statistics between the previous frame and the current frame. We implement the proposed algorithm in MPEG-4 coders and verify its performance while comparing it to the TMN8's approach (up to 0.6dB of improvement).

• Journal of the Institute of Electronics Engineers of Korea SP
• /
• v.42 no.6
• /
• pp.63-72
• /
• 2005

In this paper, we propose the bit-rate control algorithm for the block based image compression like H.263, H.263+ or MPEG-4. The proposed algorithm is designed to identify the quantization parameter set through the Lagrangian optimization technique based on the well-known linear source model. We set the Lagrangian cost function with the rates and distortion calculated from the linear source model. We calculate the quantization parameter set using the Vitervi algorithm to solve the Lagrangian optimization problem considering the Dquant method of H.263 and MPEG-4. The proposed algorithm improves the video quality by up to 1.5 dB compared with the TMN8 scheme, and is more effective in the video sources with dynamic activities than the consistent quality approaches.

• The Journal of Korean Institute of Communications and Information Sciences
• /
• v.27 no.6C
• /
• pp.535-543
• /
• 2002

In order to overcome disadvantages of existing centralized network management systems that use simple objects, dynamic object platforms are proposed as alternative systems. So the distributed network management systems are implemented using various distributed platform such as CORBA and Java-RMI. Subsequently mobile agent-based platforms are proposed. The mobile agent-based platform can additionally provide flexibility and scalability to network management system that CORBA or Java-RMI based platforms do not support. In this paper, we address an architecture to solve the problem of the occurrence of additional traffic by using mobile agent and to save resources of network element. Our proposal in this paper is an efficient network management architecture using motile agents. And we make use of mobile agents for minimizing of traffic that can happen when mobile agents moves. Also we design agents using information architecture of TMN for efficient resource management of network element and improvement of operation performance.

• Proceedings of the Korean Information Science Society Conference
• /
• 1998.10a
• /
• pp.368-370
• /
• 1998

현재 전세계적으로 개발 중인 제 3세대 이동통신인 IMT-2000은 여러 종류의 이동 서비스를 제공하기 위해 형성되어 있는 기존의 다양한 망들을 하나로 통합하고 지상과 위성간의 상호 보완적인 망을 구성하여 이를 통해 고정 망과 동등한 품질로 가능한 모든 다양한 멀티 미디어 서비스 및 이동 통신 서비스를 제공할 수 있는 유연한 시스템이다. 이렇게 다양한 서비스를 제공하기 위해 IMT-2000 망관리는 다양한 벤더 및 운영자환경 하에서 시슨템을 계획, 제, 설치, 운용, 유지, 관리 및 고객서비스를 위한 다양한 기능들을 제공하여야하면, 이를 위해 TMN개념을 적용하여햐 한다. 본 논문에서는 RACE H.551의 서비스 관리 대상 객체(Service Managed Object)를 IMT-2000에 맞게 확장하였고, 확장된 관리대상 객체와 NMF(Network Management Forum )의 BPM(Business Process Model)의 관계를 나타내었다.

• Proceedings of the Korean Information Science Society Conference
• /
• 1998.10a
• /
• pp.246-247
• /
• 1998

PCS를 포함한 차세대 이동통신은 ATM/B-ISDN을 core network으로 하여 다양한 서비스를 제공하는 방향으로 발전할 것으로 예상된다. 이러한 유.무선 통합환경에서 PCS mobility를 효율적으로 제공하기 위해서 TINA와 같은 계층적 연결관리 구조와 이 구조에 적합한 라우팅 기법이 필요하다. 본 논문에서는 ATM/B-ISDNTINA통신망에서 기존의 라우팅 기법에 비해 장점을 가지면서, TINA의 계층적 연결관리 구조를 기바능로 하는 병렬.분산 라우팅 기법을 제안한다. 제안된 병렬.분산 라우팅 기법은 라우팅 알고리즘이 서브네트워트 단위로 병렬적, 계층적으로 실행되어 사용자가 원하는 QoS연결을 제한된 시간내에 빠르게 설정할 수 있으므로, PCS mobility지원을 위한 빈번한 경로 재설정 요구에 유연하게 대처 할수 있다. 또한, 연결관리 체계가 계층적으로 이루어져 있어 TMN/TNA를 통한 체계적인 통신망 관리에도 효율적이다.

• Electronics and Telecommunications Trends
• /
• v.10 no.2 s.36
• /
• pp.73-86
• /
• 1995

통신망은, 사용자의 다양한 요구, 효율적인 보수, 운용의 추구 및 통신사업의 자유화와 동반하여 멀티미디어화, 통신 및 정보 분야의 전략 산업화에 의한 멀티벤더화 등에 의해 점점 복잡해 지고 있다. 이를 해결하기 위해 ITU-T(구CCITT)에서는 국제회의를 통하여 지능망 (Intelligent Network) 및 TMN(Telecommunication Management Network)에 관한 권고를 만들고 있는 중이다. 이와는 다른 방향으로 TINA(Telecommunications Information Networking Architecture)에 대한 작업이 진행중에 있다. TINA는 지능망과는 달리 컨소시엄(TINA-Consortium)을 구성하여 작업을 수행하고 있으며, 적용 기술에 있어서도 다른 각도에서 접근하고 있다. 이러한 지능망과 TINA는 아직 모든 문제를 완전히 해결한 것은 아니지만 점차 통신망의 고도화에 기여하고 있다. 차세대 통신망기술로 부각되고 있는 TINA는 분산처리 및 객체 지향 기술과 같은 고도의 정보 처리기술을 통신 기술에 적용한 구조이다. 몇몇 연구에서는 지능망에서 TINA로의 진화등에 관해 기술하고 있지만, 지능망과 TINA의 차이점을 부분적인 기술의 관점에서 기술하고 있기 때문에 진정한 차이점을 파악하기가 어렵다. 본 논문에서는 지능망과 TINA의 차이점을 기술 측면에서 비교함으로써, 현재 연구중인 TINA의 관계정립의 발판을 마련하고자 한다.

• Proceedings of the IEEK Conference
• /
• 2004.06a
• /
• pp.127-130
• /
• 2004

This paper describes the design and implementation of a SNMP Agent for NG-SDH transmission system. One of the most important items in SDH network management is the information model that implements every function of SDH equipment at network level. Although the TMN framework of SDH information model has been defined quite well, CMIP constraints of a real implementation urge vendors to implement proprietary features, and make it more difficult to maintain an integrated view of multivendor SDH networks management. To solve these aspects, this work proposes SNMP information model that allows a simple view of NG-SDH network management.

• Journal of the Korea Computer Industry Society
• /
• v.7 no.5
• /
• pp.513-520
• /
• 2006

In this paper, we propose a novel real-time frame-layer rate control algorithm using sliding window method for low bit rate video coding. The proposed rate control method performs bit allocation at the frame level to minimize the average distortion over an entire sequence as well as variations in distortion between frames. A new frame-layer rate-distortion model is derived, and a non-iterative optimization method is used for low computational complexity. In order to reduce the quality fluctuation, we use a sliding window scheme which does not require the pre-analysis process. Therefore, the proposed algorithm does not produce time delay from encoding, and is suitable for real-time low-complexity video encoder. Experimental results indicate that the proposed control method provides better visual and PSNR performance than the existing TMN8 rate control method.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
• /
• 2003.05a
• /
• pp.546-550
• /
• 2003

For dual-band operation, it can be done by loading two pair of narrow slots in the equilateral-triangular patch, one embedded close to the side edges of the patch and the other inserted at the bottom edge of the patch. The obtained two operating frequencies are of same polarization planes. The frequency ratio of the two operating frequencies is turnabled by varing the positions and lengths of the inserted slots at the bottom edge of the patch. In this paper, A single-feed equilateral-triangular microstrip patch with two pairs of narrow slot for dual-frequency operation is printed on the substrate(TMN-4 Rosers Co.) of the 60 miles. the antenna radiation characteristics are calculated by Ensemble ver. 5.0 software, and compared with the experimental results.