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Managing hardware resources efficiently when they are shared in virtualized environment is a critical issue for improving application QoS. For CPU resources, virtual machine scheduling delays should be additionally concerned, because they cause unexpected service delays to guest applications and can consequently violate the application QoS. There have been many researches to manage CPU resources by...
A dynamic thread pool model is one of a multithread server programming model that handles many requests from users concurrently. Even though a model such as watermark thread pool model overcomes the efficient usage of resources, it could be more efficient to obtain the required number of threads in advance. In this paper, we implement a prediction-based dynamic thread pool model using customized exponential...
Virtualization is widely used to enhance the utilization of the resources in the enterprise data centers. Migration can solve the resource shortage problem of a physical machine in virtualized environment. If the future resource usage can be predicted, the resource can be managed more efficiently. Auto Regression prediction scheme is well-known for its simplicity and accuracy, but it requires complex...
We present a novel magnetic manipulation mechanism capable of producing two-dimensional, dynamic magnetic trapping using electric field addressed free-suspending ferrofluidic droplets. This is realized by coupling a permanent magnet with a ferrofluidic droplet that induces a highly non-uniform magnetic field for manipulating other magnetic particles. By implementing an electrode design, we use electrostatic...
System virtualization come into the spotlight again with the emerging virtual machine (VM) technologies (e.g., Parallels, VMware and Xen). With these market trends toward virtual environments, many research groups are developing evaluation tools to check the performance of virtual systems and their overheads. However, the performance characterization in virtual environments has not been established...
Most traditional cluster file systems replicate whole files to support the data availability. However, considering that the access patterns of file systems have high localities, replicating whole files is not an efficient strategy to improve the data availability. This paper presents the design and the implementation of HA-PVFS, a PVFS supporting high data availability, in which the replication is...
In 3G-324M protocol proposed for the real time video telephony communication in wireless environments, when video and audio frames are transferred, transmission delay can be occurred if the size of internal buffer increases. The size of inter- nal buffer can be efficiently controlled if efficient communication scheduling is possible. In this paper, we propose an efficient com- munication scheduling...
Recently, building streaming overlay network with- out any loss of the scalability has been a challenging issue. Al- though there have been many research efforts to optimize the overlay structure for scalability, much success has not been no- ticed. One of the reasons is that the nodes inside the NAT boun- dary are excluded when the overlay structure is constructed. This paper presents a streaming...
A superpeer size adaptation using PSO is proposed for the self-organizing superpeer ring with loosely-consistent DHT. In the proposed scheme, all peers memorize the superpeer ratio where they or their neighbors experienced the best response time and adjust the superpeer ratio autonomously using PSO algorithm. Without tuning the optimal superpeer ratio value manually, the self-organizing superpeer...
We propose a dynamic layer management scheme for superpeer ring with a loosely-consistent DHT, where high capacity peers are selected as superpeers based on the capacity data colleted by mobile agents. The benchmarking results show that our scheme outperforms the static superpeer systems in terms of search latency at the expense of overhead.
In this paper, we develop an ant-system based algorithm for approximately solving large Markov decision process (MDP) problems for infinite horizon discounted cost criterion, extending the applicability of the ant-system meta-heuristic into stochastic sequential decision making problems. The algorithm inherits the spirit of the well-known policy iteration algorithm with an adaptation of the ant system...
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