• Journal of Korea Multimedia Society
• /
• v.7 no.4
• /
• pp.518-531
• /
• 2004

This paper discusses a testbed architecture for implementing scalable service differentiation in the Internet. The differentiated services (DiffServ) testbed architecture is based on a model in which a bandwidth broker (BB) can control network resources, and the ALTQ can reserve resources in a router to guarantee a Quality of Service (QoS) for incoming traffic to the testbed. The reservation and releasemessage for the ALTQ is contingent upon a decision message in the BE. The BB has all the information in advance, which is required for a decision message, in the form of PIB. A signaling protocol between the BB and the routers is the COPS protocol proposed at the IETF. In terms of service differentiation, a user should make an SLA in advance, and reserve required bandwidth through an RAR procedure. The SLA and RAR message between a user and the BB has implemented with the COPS extension which was used between a router and the BB. We evaluates the service differentiation for the video streaming in that the EF class traffic shows superb performance than the BE class traffic where is a network congestion. We also present the differentiated service showing a better packet receiving rate, low packet loss, and low delay for the EF class video service.

• Proceedings of the Korean Society for Quality Management Conference
• /
• 2006.11a
• /
• pp.90-95
• /
• 2006

고객 만족도조사 (Customer Satisfaction Index)는 기업 외부 관점에서 고객의 만족도를 조사하여 기업의 서비스 품질 개선에 기여한다. 그러나 기업 외부 관점의 고객만족도만의 서비스 평가뿐 아니라 내부 직원의 업무 평가를 통한 서비스 품질 개선도 필요하다. 내부 직원의 업무 평가는 직원 개개인의 능력까지 평가할 수 있는 COI(Customer Orientation Index)통해 이루어질 수 있다. 따라서 CSI 와 COI를 연계 분석하면 기업 외,내부 관점에서의 효과적이 서비스 품질 개선이 가능하다. 또, 고객만족을 위한 높은 서비스 품질을 유지하기 위해서는 서비스 품질 개선뿐 아니라 지속적인 관리와 모니터링도 필요한데 CSI 만으로는 한계가 있다. 이를 위해 CSI 분석 결과 도출된 핵심관리 프로세스를 지표화 하여 관리하기 위해 서비스 수준 계약서 (Service Level Agreement)에 반영하여 관리할 수 있다.

• Proceedings of the Korean Information Science Society Conference
• /
• 2008.06b
• /
• pp.19-23
• /
• 2008

국제 회계 기준의 도입이 금융 산업 전반에 많은 업무와 IT 시스템의 변화를 요구 하고 있으며, 특히 보험업의 경우 정확한 원가분석을 통한 경쟁력을 갖춘 상품을 판매 하고자 하며, 대다수의 대형 보험사의 경우IT 업무는 Outsourcing을 통해 운영하고 있어, SLA(Service Level Agreement)계약의 정확한 원가를 산정 하고자 한다. 이에 보험 산업에서는 ERP 및 ABC를 도입 하고 있으나, 현재의 원가 산정 방식 시스템은 건 별 배분이 불가 하거나, 작업에 투입되는 시스템 자원 및 인력 비용을 많이 요구 하고 있다. 본 논문에서는 ABC 기반의, IT비용배분과 Rollup에 의한 사업비 배부 모델을 제시 하고, Pilot Test를 통하여 본 연구 모델의 우수성을 증명 하였다.

• IEMEK Journal of Embedded Systems and Applications
• /
• v.11 no.3
• /
• pp.153-162
• /
• 2016

This paper proposes an optimal dynamic resource allocation method in IoT (Internet of Things) parking guidance system using Q-learning resource allocation model. In the proposed method, a resource allocation using a forecasting model based on Q-learning is employed for optimal utilization of parking guidance system. To demonstrate efficiency and availability of the proposed method, it is verified by computer simulation and practical testbed. Through simulation results, this paper proves that the proposed method can enhance total throughput, decrease penalty fee issued by SLA (Service Level Agreement) and reduce response time with the dynamic number of users.

• Proceedings of the Korea Information Processing Society Conference
• /
• 2014.04a
• /
• pp.121-123
• /
• 2014

클라우드 브로커는 대규모의 데이터센터를 거느린 클라우드 서비스 제공자와 그로부터 제공되는 자원을 이용하여 원하는 작업을 실행하는 클라우드 이용자 사이를 중개하여 제공자 측에는 보다 많은 이용자들이 서비스를 이용하는 데 용이하도록 하여 수익을 증대시키고, 이용자 측에는 정해진 예산 내에서 서비스 협정(Service Level Agreement, SLA)를 보장하여 원하는 작업을 실행하도록 하는 역할을 수행하여 스스로의 이익을 창출한다. 본 논문에서는 클라우드 브로커의 이러한 서비스 차익거래를 위해 필요한 VM 풀의 운영에 있어 효과적인 VM 예약 기법을 제안한다.

• Journal of KIISE:Computer Systems and Theory
• /
• v.35 no.9_10
• /
• pp.452-465
• /
• 2008

This paper proposes a light-weight, seamless integrated access control for global e-Science resource sharing. E-Science, based on Grid Computing, was designed to help scientists to remotely control and process the Grid resources such as high-end equipments and remote machines. As many researchers engage in the e-Science Grids, the researchers in a grid often have to wait for or give up use of the Grid resources, even when there are idle resources in other Grids. In this case, provided that proper compensation is given, Grid resource sharing is helpful both for the researchers and the Grids which provide their resources. But, sharing Grid resources globally is not simple, as each e-Science Grid is especially designed for resource sharing in its Virtual Organization(VO) and already has its unique access control policy for its resources. This paper proposes a new integrated access control for e-Science Grid resource sharing. The access control is light-weight without any priori service level agreement(SLA)s among the Grids which share their resources and seamless because the users can use the resources shared as the ones belonging to their Grids without their additional registration to the other Grids.

• Journal of the Institute of Electronics Engineers of Korea TC
• /
• v.46 no.8
• /
• pp.59-66
• /
• 2009

Recently, as the expectation about the IPTV (Internet Protocol TV) service quality is rapidly increased by the development of the national high-speed internet and TPS (the Triple Play Service : data + image + audio) service Therefore, the enactment of the national quality standards about the IPTV service quality guaranteeing the real time video quality of a subscriber and the international standards are hastily needed. This paper built a test bed with the network domain and the subscriber set-top box domain including the headend area and commercial network characteristic in order to test in the environment which is similar to the characteristic of the service business network. And by using the constructed environment, the characteristics required for SLA(service Level Agreement) of the IPTV service are presented as the quality test according to the service environment change.

• The Journal of Korean Institute of Communications and Information Sciences
• /
• v.29 no.7B
• /
• pp.711-721
• /
• 2004

To provide the end-to-end service differentiation for assured services, the random early demotion and promotion (REDP) marker in the edge router at each domain boundary monitors the aggregate flow of the incoming in-profile packets and demotes in-profile packets or promotes the previously demoted in-profile packets at the aggregate flow level according to the negotiated interdomain service level agreement (SLA). The REDP marker achieves UDP fairness in demoting and promoting packets through random and early marking decisions on packets. But, TCP fairness of the REDP marker is not obvious as fur UDP sources. In this paper, to improve TCP fairness of the REDP marker, we combine a dropper with the REDP marker. To make packet transmission rates of TCP flows more fair, at the aggregate flow level the combined dropper drops incoming excessive in-profile packets randomly with a constant probability when the token level in the leaky bucket stays In demotion region without incoming demoted in-profile packets. It performs a dropping in the demotion at a domain boundary only if there is no prior demotion. The concatenate dropping at multiple domains is avoided to manifest the effect of a dropping at a domain boundary on TCP fairness. We experiment with the REDP marker with the combined dropper using ns2 simulator for TCP sources. The simulation results show that the REDP marker with the combined dropper improves TCP fairness in demoting and promoting packets by generating fair demoted in-profile traffic compared to the REDP marker. The effectiveness of the selected drop probability is also investigated with showing its impact on the performance of the REDP marker with the combined dropper.

• The Journal of Korean Institute of Communications and Information Sciences
• /
• v.29 no.4B
• /
• pp.444-454
• /
• 2004

To support diverse transmission requirements of multimedia applications, Quality of Service (QoS) should be provided in the Internet, where only the best-effort service is available. In this paper, we describe our recent effort on the implementation and verification of an extendable and flexible QoS allocation and resource management system based on the bandwidth broker model for realizing the IETF differentiated service (DiffServ). Focusing on the bandwidth issue over single administrative domain, the implemented system provides real-time resource reservation and allocation, delayed call admission control, simple QoS negotiation between sewer and users, and simple resource monitoring. The implemented system is verified by evaluating the performance of a resource-intensive application over the real-world testbed network.

• KSII Transactions on Internet and Information Systems (TIIS)
• /
• v.16 no.6
• /
• pp.1892-1912
• /
• 2022

With the massive demand and growth of cloud computing, virtualization plays an important role in providing services to end-users efficiently. However, with the increase in services over Cloud Computing, it is becoming more challenging to manage and run multiple Virtual Machines (VMs) in Cloud Computing because of excessive power consumption. It is thus important to overcome these challenges by adopting an efficient technique to manage and monitor the status of VMs in a cloud environment. Reduction of power/energy consumption can be done by managing VMs more effectively in the datacenters of the cloud environment by switching between the active and inactive states of a VM. As a result, energy consumption reduces carbon emissions, leading to green cloud computing. The proposed Efficient Dynamic VM Scheduling approach minimizes Service Level Agreement (SLA) violations and manages VM migration by lowering the energy consumption effectively along with the balanced load. In the proposed work, VM Scheduling for Efficient Dynamically Migrated VM (VMS-EDMVM) approach first detects the over-utilized host using the Modified Weighted Linear Regression (MWLR) algorithm and along with the dynamic utilization model for an underutilized host. Maximum Power Reduction and Reduced Time (MPRRT) approach has been developed for the VM selection followed by a two-phase Best-Fit CPU, BW (BFCB) VM Scheduling mechanism which is simulated in CloudSim based on the adaptive utilization threshold base. The proposed work achieved a Power consumption of 108.45 kWh, and the total SLA violation was 0.1%. The VM migration count was reduced to 2,202 times, revealing better performance as compared to other methods mentioned in this paper.