• KSII Transactions on Internet and Information Systems (TIIS)
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• v.9 no.6
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• pp.2050-2077
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• 2015

One of the major issues in emerging cloud management system needs the efficient service level agreement negotiation framework, with an optimal negotiation strategy. Most researchers focus mainly on the atomic service negotiation model, with the assistance of the Agent Controller in the broker part to reduce the total negotiation time, and communication overhead to some extent. This research focuses mainly on composite service negotiation, to further minimize both the total negotiation time and communication overhead through the pre-request optimization of broker strategy. The main objective of this research work is to introduce an Automated Dynamic Service Level Agreement Negotiation Framework (ADSLANF), which consists of an Intelligent Third-party Broker for composite service negotiation between the consumer and the service provider. A broker consists of an Intelligent Third-party Broker Agent, Agent Controller and Additional Agent Controller for managing and controlling its negotiation strategy. The Intelligent third-party broker agent manages the composite service by assigning its atomic services to multiple Agent Controllers. Using the Additional Agent Controllers, the Agent Controllers manage the concurrent negotiation with multiple service providers. In this process, the total negotiation time value is reduced partially. Further, the negotiation strategy is optimized in two stages, viz., Classified Similarity Matching (CSM) approach, and the Truncated Negotiation Group Gale Shapely Stable Matching (TNGGSSM) approach, to minimize the communication overhead.

• Journal of KIISE
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• v.42 no.11
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• pp.1361-1371
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• 2015

Depending on the increase amongst various cloud services, the technology of the Cloud Service Broker (CSB) to find the most appropriate services to meet the needs of cloud service consumers has emerged. In order to advance for cloud services to be used through the CSB, it is important to ensure the quality level that meets the demands of consumers through a negotiation process based on the Service Level Agreement (SLA). However, quality metrics of cloud services are different from each other based on the measurement scale, which represents the quality level, and the calculation for each type of cloud services. Therefore, it is necessary to analyze the variability of the quality of cloud services and establish a SLA model for ensuring and improving the level of quality. In this paper, we analyze the quality metrics for the specific type of cloud services by applying the cross-cutting concept and propose a Virtual SLA (VSLA) meta-model.

• The Journal of Information Systems
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• v.16 no.3
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• pp.69-90
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• 2007

Recently, Service Level Management(SLM) including SLA has been developing to manage the level of information systems service. Although previous SLA studies have provided the conceptual model and critical success factors, the studies have not tested the effectiveness of the SLA by way of the empirical study. In this study, we applied an innovation decision making theory to our model and tested an empirical study using of a firm survey data. We suggested a SLM model, which consists of SLA planning, application, management dimensions. We found that the SLM's management stage has an impact on performance, whereas SLM's planning and application has not. At each sub dimensional analysis, there are found that adequate SLA indicators in the application stage influences performance and change management and feedback & reporting in the management stage influence performance.

• Information Systems Review
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• v.2 no.1
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• pp.85-99
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• 2000

• The KIPS Transactions:PartA
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• v.12A no.7 s.97
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• pp.613-620
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• 2005

To provide reliable differentiated service for internet clients, many studies on differentiated service are widely done. According to the types of the request of the clients in cluster-based web systems, SLA (Service Level Agreement) between service provider and the clients is considered. In this Paper, we study primary-backup web switch in the web systems that distribute the request of clients to each of web servers and also study performance isolation and admission control schemes of heterogeneous web systems which distinguish the servers into each different function domains. We analyze the availability, the response time and the performance of admission control through various simulated experiments on the proposed web systems.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.20 no.6
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• pp.221-235
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• 2010

Internet service providers provide various security services, such as firewall, intrusion detection, intrusion prevention, anti-virus, along with their main Internet services. Those security service users have no idea what kind of quality services they are guaranteed. And therefore, Internet users interest in Security Service Level Agreement(SLA) increases as their interest in secure Internet service increases. However, there wasn't any researches in the S-SLA area domestically and there are only limited SLA indexes related to system or service maintenances at the moment. Therefore, this paper analyses security functions in IPS services and categorize them into common and independent security functions. Finally to improve quality of security services, this paper proposes S-SLA indexes depending on the different security levels. This will be subdivide into agreement on security service.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.12 no.3
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• pp.1373-1379
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• 2011

The SLA (Service Level Agreement) is once determined between service provider and users in B3G networks so that the network service must be provided as QoS management. Here, the network situation is changed as the time flow, and the service environment is also altered. Hence, dynamic QoS management scheme should be considered. In this paper, we propose a handover scheme for dyanamic QoS as the network situation in B3G networks. The heterogeneous networks can be used for dynamic QoS management in B3G networks.

• Proceedings of the Korean Information Science Society Conference
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• 2005.11a
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• pp.556-558
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• 2005

SLA(Service Level Agreement)는 최근 들어 IT서비스를 받는 고객들에게 서비스 보장에 대한 명확한 계약과 일정수준 이상의 서비스 관리 제공으로 의무화 추세가 증가되고 있다. 또한 서비스 공급자는 변화하는 고객의 요구사항을 직면하여 SLA의 적용을 통해 서비스 Quality를 높이는데 주력하고 있다. 특히 특정 가입자가 두지점 사이에 교환 설비를 거치지 않고 직접 연결하여 독점적으로 사용할 수 있는 전용회선 서비스는 End-To-End간의 품질보증을 기본 목적으로 하고는 있지만 저렴한 요금의 프레임릴레이 ATM, VPN등 대체서비스로의 이동이 이어지고 있어 고객 측면의 새로운 방안 제시가 필요한 실정이다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2001.10a
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• pp.49-52
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• 2001

인터넷 서비스의 수요가 급증함에 따라 정보통신서비스 제공기법에서도 사용자에게 보장된 네트워크 품질 제공을 할 수 있도록 SLA(Service Level Agreement) 도입의 중요성이 부각되고 있다. 서비스 품질내부자원 활용도를 증가시키고 타 기업간의 경쟁에 효과적으로 대응하기 위해서는 서비스 제공자와 사용자간의 협약인 SLA 제공이 이루어져야 한다. 최근 국내 몇 IDC 업체들로부터 SLA 제공이 시작되고 있으나, 국내 IP 기반 통신서비스 제공업체에서는 SLA 제공이 미흡한 실정이다. 본 논문에서는 IP 기반 통신망에서 필요한 SLA를 분류하고, 각 SLA에 영향을 미치는 네트워크 요소들을 살펴봄으로써, 기업에서는 SLA 제공을 통해 이용 가능한 네트워크 자원을 최적화 함과 동시에 사용자들에게 품질이 보장된 다양한 서비스를 제공한 수 있게 될 것이다.

• Journal of Communications and Networks
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• v.15 no.3
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• pp.301-311
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• 2013

This paper proposes a policy-based quality of service (QoS) management framework for adaptive routing decisions. We present an approach considering interior gateway protocol (IGP) for path discovery mechanisms and QoS-aware policies for configuring the network elements. The integration of the aforementioned modules into this policy-based network management (PBNM) system is demonstrated by conducting experiments in a real environment, the hellenic public administration network SYZEFXIS. These experiments combine different traffic conditioning mechanisms through event detectors, consider IP service level agreement mechanisms that interoperate with the PBNM system and analyze the enforcement of IGP and QoS policies. Finally, validation and measurement tools are used to prove the efficiency of this framework. It is shown that this architecture offers significantly increased performance and learning capabilities, while the PBNM system achieves adaptive QoS routing through automated configuration considering the avoidance of suboptimal routing issues or under-performance conditions of the network entities.