• 한국멀티미디어학회논문지
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• 제13권2호
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• pp.279-286
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• 2010

서비스 품질을 보장하는 네트워크에서 경로를 구성하는 노드에 가해지는 부하의 불균형은 경로의 트래픽 흐름 수락 능력을 저해하는 주요 요인으로 알려져 있다. 이러한 문제를 해결하기 위해 다양한 경로 부하 밸런싱 방법이 개발되었으며, 이들은 모두 경로의 가용 자원 상황에 따라 각 노드에 할당되는 흐름의 지연한계를 재조정하는 피드백 부하 밸런싱 방법을 사용하였다. 이들 방법은 트래픽 부하의 서비스 품질의 확률적인 특성을 전혀 고려하지 않아 부하 불균형을 사전에 예방할 수 없으므로 수락 능력 저하를 개선하는데 있어 근본적인 한계가 있다. 본 연구에서는 트래픽 부하의 서비스 품질의 확률적 특성에 기초한 예방적 부하 밸런싱을 모색하고 RSVP에 적용할 수 있는 구체적 방법을 제안한다. 간단한 평가 네트워크를 대상으로 제안한 방법의 성능을 평가한 결과 기존 방식 대비 4~22% 정도 높은 흐름 수락 능력을 제공함을 확인하였다.

• 콘크리트학회논문집
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• 제12권4호
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• pp.31-40
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• 2000

This study aims to improve serviceability of concrete by inducing chemical prestress with the application of expansive additives for concrete. For this purpose, material tests and 4 point-bending tests of RC slabs were performed to verify the effect of expansive additives on the concrete. and the critical aspects of the structural behavior were investigated. The results of the material tests show that the optimal proportion of expansive additives is 13% of total cement weigth and the properties of expansive concrete in that proportion are the same as those of plain concrete. Both the experimental cracking load and service load of the expansive concrete slabs are increased in comparison with those of the plain concrete. In addition to the above results, the deflection of expansive concrete is smaller than that of plain concrete, and permanent strains resulting from cyclic load are decreased. It can be concluded that the use of expansive additives to induce chemical prestress in RC slabs greatly improves the serviceability.

• 한국정보처리학회:학술대회논문집
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• 한국정보처리학회 2012년도 추계학술발표대회
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• pp.759-762
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• 2012

This paper is for EPC(Evolved Packet Core) network to share the load balance by IMSI(International Mobile Subscriber Identity) prefix in MME(Mobility Management Entity). For the telecommunication, it needs to choose the anchoring gateway to use the specific gateway to avoid the traffic load to support the efficient telecommunication service. We propose the way to choose the effective gateway to avoid the traffic load in order for good qualify service. We compare the load between the gateways which are the general gateway and the specific gateway used by proposed concept.

• Journal of Information Processing Systems
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• 제17권2호
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• pp.297-305
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• 2021

Large amount of data is being generated in gaming servers due to the increase in the number of users and the variety of game services being provided. In particular, load balancing schemes for gaming servers are crucial consideration. The existing literature proposes algorithms that distribute loads in servers by mostly concentrating on load balancing and cooperative offloading. However, many proposed schemes impose heavy restrictions and assumptions, and such a limited service classification method is not enough to satisfy the wide range of service requirements. We propose a load balancing agent that combines the dynamic allocation programming method, a type of greedy algorithm, and proximal policy optimization, a reinforcement learning. Also, we compare performances of our proposed scheme and those of a scheme from previous literature, ProGreGA, by running a simulation.

• 대한전기학회논문지:전력기술부문A
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• 제52권10호
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• pp.571-576
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• 2003

XML Web Service based on internet can cause problems on transmission speed and data error. Also system analysis results simulated by several different research groups can hardly have reliability because of error data that come from improperly managed files. In order to solve this problems, algorithm sever using XML Web Service is shared on the internet so widely that various application programs based on basic analysis module with a united IO can be developed. And also XML Dataset DB is interacted with XML Web Service, which prevents propagation of error data. It causes to improve reliabilityon the load flow analysis result and solve the problems on data error or transmission speed that can possibly come from internet.

• 한국정보처리학회논문지
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• 제7권3호
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• pp.953-961
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• 2000

In this paper, we propose the algorithm which solve synchronization problem happened migrating service objects. Load imbalance is occurred due to allocate different amount of load to be proposed to each node in distribute system. To solve this problem, the service objects have to be migrated from heavily loaded node to lightly loaded node. And in such a process, the synchronization problem may occur when client request a service object migrated incompletely. Therefore, we describe the environment of executing service objects, the importer/exporter/trader model compatible with migration of service objects, and appropriate migration algorithm, Finally, we analyze the conditions of problems, and propose the solution of each situations. Also, the performance advantages of using proposed algorithms are quantified through a simulation study.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제17권11호
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• pp.3030-3049
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• 2023

With the development and wide application of hybrid network computing modes like cloud computing, edge computing and fog computing, the customer service requests and the collaborative optimization of various computing resources face huge challenges. Considering the characteristics of network environment resources, the optimized deployment of service resources is a feasible solution. So, in this paper, the optimal goals for deploying service resources are customer experience and service cost. The focus is on the system impact of deploying services on load, fault tolerance, service cost, and quality of service (QoS). Therefore, the alternate node filtering algorithm (ANF) and the adjustment factor of cost matrix are proposed in this paper to enhance the system service performance without changing the minimum total service cost, and corresponding theoretical proof has been provided. In addition, for improving the fault tolerance of system, the alternate node preference factor and algorithm (ANP) are presented, which can effectively reduce the probability of data copy loss, based on which an improved cost-efficient replica deployment strategy named ICERD is given. Finally, by simulating the random occurrence of cloud node failures in the experiments and comparing the ICERD strategy with representative strategies, it has been validated that the ICERD strategy proposed in this paper not only effectively reduces customer access latency, meets customers' QoS requests, and improves system service quality, but also maintains the load balancing of the entire system, reduces service cost, enhances system fault tolerance, which further confirm the effectiveness and reliability of the ICERD strategy.

• 복합신소재구조학회 논문집
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• 제1권1호
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• pp.34-45
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• 2010

This paper describes the design, manufacturing process, testing, application, and assessment of capacity-ratings of the first all advanced composites bridge on a public highway system. In order to verify the bridge design prior to the field application, a sub-scale bridge superstructure was built and tested in the laboratory. The field load test results were compared with those of the finite element analysis for the verification of validity. To investigate its in-service performance, field load testing and visual inspections were conducted under an actual service environment. The paper includes the presentation and discussion for advanced composites bridge capacity rating based on the stress modification coefficients obtained from the test results. The test result indicates that the advanced composites bridge has no structural problems and is structurally performing well in-service as expected. Since these composite materials are new to bridge applications, reliable data is not available for their in-service performance. The results may provide a baseline data for future field advanced composites bridge capacity rating assessments and also serve as part of a long-term performance of advanced composites bridge.

• Journal of Communications and Networks
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• 제5권1호
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• pp.73-81
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• 2003

The controlled load service defined within the IETF's Integrated Services architecture for quality-of-service (QoS) in the Internet requires source nodes to regulate their traffic while the network, in combination with an admission control strategy, provides a guarantee of performance equivalent to that achieved in a lightly loaded network. Packets sent in violation of the traffic contract are marked so that the network may assign them a lower priority in the use of bandwidth and buffer resources. In this paper, we define the requirements of a scheduler serving packets belonging to the controlled load service and present a novel scheduler that exactly achieves these requirements. In this set of requirements, besides efficiency and throughput, we include an additional important requirement to bound the additional delay of unmarked packets caused due to the transmission of marked packets while dropping as few marked packets as possible. Without such a bound, unmarked packets that are in compliance with the traffic contract are not likely to experience delays consistent with that in al lightly loaded network. For any given desired bound ${\alpha}$ on this additional delay, we present the CL(${\alpha}$) scheduler which achieves the bound while also achieving a per-packet work complexity of O(1) with respect to the number of flows. We provide an analytical proof of these properties of the CL(${\alpha}$) scheduler, and we also verify this with simulation using real traces of video traffic. The scheduler presented here may be readily adapted for use in scheduling flows with multi-level priorities such as in some real-time video streams, as well as in other emerging service models of the Internet that mark packets to identify drop precedences.

• 한국통신학회논문지
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• 제30권3B호
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• pp.105-113
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• 2005

본 연구에서는 PVM으로 구성된 클러스터의 공유를 기반으로 하는 단계화된 응용서비스 플랫폼을 기반으로 응용서비스를 구현함으로써 응용서비스 플랫폼의 유용성을 평가하였다. 응용서비스 플랫폼은 요청 처리에 필요한 전 과정을 요청처리 단계와 서비스제공 단계로 나누고, 서비스요청처리 단계를 위한 전위응용서버의 서비스관리자와 요청된 서비스의 분산을 담당하는 부하관리자, 그리고 후위서버에서의 서비스제공을 위한 작업관리자로 구성된다. 구현된 응용서비스 플랫폼은 필요한 처리자원을 동적으로 할당, 시스템을 재구성함으로써 기존의 단일서버 시스템에 비해 부하의 변화에 보다 능동적으로 대처할 수 있을 뿐 아니라, 기능의 변경없이 다양한 응용서비스의 구현을 지원함을 확인하였다.