• 한국IT서비스학회:학술대회논문집
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• 한국IT서비스학회 2006년도 추계학술대회
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• pp.366-371
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• 2006

To compensate the loss of leased-line subscribers and the excessive increase of residential xDSL (Digital Subscriber Line) ones of KT (Korea Telecom), the paper proposes the service model by which it can reinstate the subscription ratio status through employing next generation OSS (Operations Support System) and highquality MPLS (Multiprotocol Label Switching) VPN (Virtual Private Network). It also describes diverse modules comprising NeOSS (New OSS) of KT, followed by detailed accounts regarding the service delivery process of KT VPN. Shortly visited are the primary constituents as well as configuration parameters of MPLS VPN. Finally the network topology along with a feasible service model case is presented.

• ETRI Journal
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• 제41권2호
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• pp.207-223
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• 2019

Network function virtualization can significantly improve the flexibility and effectiveness of network appliances via a mapping process called service function chaining. However, the failure of any single virtualized network function causes the breakdown of the entire chain, which results in resource wastage, delays, and significant data loss. Redundancy can be used to protect network appliances; however, when failures occur, it may significantly degrade network efficiency. In addition, it is difficult to efficiently map the primary and backups to optimize the management cost and service reliability without violating the capacity, delay, and reliability constraints, which is referred to as the reliability-aware service chaining mapping problem. In this paper, a mixed integer linear programming formulation is provided to address this problem along with a novel online algorithm that adopts the joint protection redundancy model and novel backup selection scheme. The results show that the proposed algorithm can significantly improve the request acceptance ratio and reduce the consumption of physical resources compared to existing backup algorithms.

• 디지털산업정보학회논문지
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• 제6권4호
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• pp.83-94
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• 2010

Mobile network infrastructure is being completed with the development of hardware and software for mobile devices. Network in mobile devices has evolved for telematics that is expanded much more than its existing concept. Telematics is compound word that is formed from the words "telecommunication" and "informatics". It means that telematics performs control and monitoring service with using mobile device resources. These services provide their services for users' requests through wired or wireless network from mobile devices and server that offers contents and network service collects management information of mobile devices. Map service is one of the preferred services for many telematics users. However, mobile map service has a limit between traffic and information sharing. Therefore it is very important to supply their information for both service provider and terminal user. In this paper, we design a new interactive sketch map using routes and information on the space to be applied effectively, and provide an extended document format that is defined to an extensible and dynamic clustering scheme to have portability map service for mobile device.

• 한국통신학회논문지
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• 제33권5B호
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• pp.334-343
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• 2008

In this work we propose a universal pricing machine, which incorporates a universal pricing framework for the future IEEE802.16 WiMAX service with multiple classes of service. A multimedia service is provided by a QoS provisioning scheme in the WiMAX network and universal pricing means that it can compute the price for any type of service in a unified framework. In the proposed pricing framework we incorporate multiple types of services such as the real time and nonreal time services that are supposed to be provided in the WiMAX network. To that purpose, let us first carry out an analysis on the current pricing scheme of Korean WiMAX service which incorporates only the data size. From that analysis we propose a new pricing scheme for the future WiMAX service that provides different service classes in the network. Via numerical experiment, we verify the implication of the work.

• 한국멀티미디어학회논문지
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• 제11권12호
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• pp.1730-1738
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• 2008

Quality of Service (QoS) Guarantees grant ways for service providers to establish service differentiation among subscribers. On the other hand, service subscribers are also assured the level of service they paid for. In addition, the efficient level of service quality can be selected according to the subscribers' needs thus ensuring efficient use of available bandwidth. While network utility optimization techniques assure certain QoS metrics, a number of situations exist where some QoS goals are not met. The optimality of the network parameters is not mandatory to guarantee specified QoS levels. This paper proposes a joint data rate and power control scheme that guarantees service contract QoS level to a subscriber using Goal Programming. In using goal programming, this paper focuses on finding the range of feasible solutions as opposed to solving for the optimal. In addition, in case no feasible solution is found, an acceptable compromised solution is solved.

• 한국정보통신학회논문지
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• 제10권11호
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• pp.2069-2074
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• 2006

앞으로의 네트워크는 IP를 중심으로 하여 여러 가지 서비스 네트워크들이 통합된 형태가 될 것이다. 기존의 PSTN 네트워크를 비롯, 이동 통신, 방송, 그리고 인터넷까지 전부 통합되어 상위 사용자에게는 어떤 서비스라도 제공할 수 있는 통합된 네트워크가 될 것이다. 이러한 통합된 네트워크 프레임워크를 구축하는데 있어 제공해야 될 중요한 프로토콜들로는 가장 먼저 이동성과 더불어 멀티호밍 등이 될 것이다. 미래의 통합된 네트워크의 단말은 소형화, 지능화로 인해 이동성이 기본이 될 것이며, 여러 가지 액세스 기술로 인해 한 단말에는 많은 인터페이스들이 존재한다. 따라서 이러한 단말에게 지속적인 서비스를 제공하기 위해서는 이동성 및 멀티호밍 프로토콜을 지원해야 하는 것이다. 본 논문에서는 이와 같이 통합된 네트워크 프레임워크상에서 서비스 이동성을 제공하기 위해 필요한 프로토콜들과 기능들에 대해 선행 연구한다.

• 한국정보통신학회논문지
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• 제4권2호
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• pp.347-356
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• 2000

본 연구는 정보통신망과 전자정부의 관계를 불가분의 관계로 보고 전자정부를 어떻게 구현시킬 수 있을 것인가에 초점을 두고 연구하는 것이 아니라 선행연구와는 다른 관점에서 정보통신망을 독립변수로 하고 전자정부의 변화를 종속변수로 하여 정보통신망이 전자정부에 어떻게 영향을 미치는가를 분석하였다. 분석의 전제조건으로는 정부조직의 구조적 측면 및 담당업무의 기능적 분석은 배제시켰다. 연구분석의 방법은 설문지조사ㆍ문헌적조사ㆍ면담조사에 의한 정책델파이기법을 이용하였으며, 설문지 조사방법은 1999. 10 - 2000. 3 사이에 1ㆍ2차로 구분하여 실시하였다. 1차 분석에 의하여 본 연구자는 초기의 문제해결은 엘리트에 의해 발전되므로 2차 조사방법은 정책델타이기법을 이용하기로 하였다. 조사방법에 의해 전자정부에 필요한 정보통신망을 분석한 결과 첫째, 초고속정보통신망 둘째, 근거리 통신망 셋째, 종합정보통신망 넷째, 일반공중통신망 다섯째, 종합유선방송망으로 나타났고, 전자정부에 필요한 정보통신망 서비스는 첫째, 재택근무서비스 둘째, 인터넷서비스 셋째, PC통신서비스 넷째, 화상회의서비스 다섯째, 전자자료교환서비스로 나타났다. 전자정부에 정보통신망이 미치는 영향은 첫째, 재택근무의 도입 둘째, 행정서비스의 개선 셋째, 행정에 주민 참여 넷째, 업무의 전산화 다섯째, 원격화상시스템 도입 등으로 나타났다.

• The Journal of the Acoustical Society of Korea
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• 제28권3E호
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• pp.99-108
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• 2009

In this paper, we suggest criteria for objective measurement of speech quality in mobile VoIP (Voice over Internet Protocol) services over wireless mobile internet such as mobile WiMAX networks. This is the case that voice communication service is available under other networks. When mobile VoIP service users in the mobile internet network based on packet call up PSTN and mobile network users, but there have not been relevant quality indexes and quality standards for evaluating speech quality of mobile VoIP. In addition, there are many factors influencing on the speech quality in packet network. Especially, if the degraded speech with packet loss transfers to the other network users through the handover, voice communication quality is significantly deteriorated by the transformation of speech codecs. In this paper, we eventually adopt the Gilbert-Elliot channel model to characterize packet network and assess the voice quality through the objective speech quality method of ITU-T P. 862. 1 MOS-LQO for the various call scenario from mobile VoIP service user to PSTN and mobile network users under various packet loss rates in the transmission channel environments. Our simulation results show that transformation of speech codecs results in the degraded speech quality for different transmission channel environments when mobile VoIP service users call up PSTN and mobile network users.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제9권11호
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• pp.4720-4738
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• 2015

Proper management on user-driven virtual circuits (VCs) is essential for seamless operation of virtual networks. The Network Provisioning System (NPS) is useful software for creating user-driven VCs automatically and must take fault management into account for physical layer impairments on user-driven VCs. This paper addresses a user-driven and trusty protection management in an NPS with an open standard Network Service Interface (NSI), as a contribution to show how to implement the user-driven and trusty protection management required for user-driven VCs. In particular, it provides a RESTful web service Interface for Configuration and Event management (RICE) that enable management of a distinguished data and control plane VC status between Network Service Agents (NSAs) in the event of a node or link fault and repair in a domain. This capability represents a contribution to show how network and protection events in a domain can be monitored between NSAs (NPSs with the NSI) in multiple domains. The implemented NPS controls and manages both the primary and backup VC with disjoint path in a user-driven manner. A demonstration to verify RICE API's capability is addressed for the trusty protection in the dynamic VC network.

• 한국산업정보학회논문지
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• 제16권5호
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• pp.55-62
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• 2011

최근 스마트 폰 보급 확대에 의해 위치기반 서비스(LBS)의 범위는 점점 더 확장되고 있고 서비스 또한 고속 이동 통신을 기반으로 매우 개인화되고 다양해지고 있다. 그 중에 위치기반 소셜 네트워크 서비스(LBSNS)는 스마트 폰 등장 이후에 가장 성장성이 기대되는 서비스이다. 본 논문은 스마트 폰의 위치에 기반하여 적응적으로 변화되는 커뮤니티를 형성하는 모델을 연구하고, 형성된 커뮤니티에 대한 적절한 관리와 형성된 커뮤니티 내의 멤버를 자동적으로 추가하거나 삭제할 수 있는 기능을 제공하는 LBSNS 서비스 모델을 제시한다. 또한, 향후 모바일 환경에서 위치기반 소셜 네트워크 서비스의 의미있는 연구방향을 기술한다.