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The boundary ringing artifacts always appears near image boundary after deconvolution. We presented a new deconvolution image boundary ringing metric to evaluate the quality of images. First, we remove the deconvolution image boundary ringing artifact using the PDE-based method, and then we compare it with the degraded image to evaluate the boundary ringing artifact. The experimental results validate...
The Fixed-Dimension particle swarm optimization (PSO) can't be used to solve the mobile agent (MA) routing problem where the number of sensor nodes which can be viewed as the dimension of particle is not always fixed, since the updating formulae are only fit for particles of same dimension to update their velocity and position. To solve MA routing problem, a variable-dimension PSO based on chord-length...
In this demonstration, we port our current Connect6 program, NCTU6, to mobile devices, such as iOS devices, Android devices. However, computing powers of mobile devices are also relatively weaker when compared with high-end machines. For example, the CPU speeds of mobile devices are about 1/5 to 1/8 of those of desktops, and the memory of mobile devices is usually limited to several megabytes. In...
The rapid advancement and ubiquity of social virtual environments is bringing geographically distant users to interact as if they are in the same physical location, leading to the emergence of new application areas that adopt virtual environment technologies. In this article, we present our experiences of enhancing The 3rd International Workshop on Massively Multiuser Virtual Environments (MMVE 2010)...
This paper studies the test and evaluation methods for parallel application in high-performance computers. The parallel performance of specific application could be attributed to its multiple application parameters. The basic test methods are proposed for application evaluation. The test results are analyzed to achieve application performance further. Finally, performance results are analyzed through...
A Web search engine must update its index periodically to incorporate changes to the Web. Query processing is a major cost factor in operating large web search engines. To solve this problem, we propose a framework for optimizing the search result by combing inverted index compression and feature-based caching. We perform a comparison and evaluation of several inverted compression algorithms. We then...
The traditional database is designed for the structured data and the complex query. In the environment of the cloud, the scale of data is very large, the data is non-structured, the request of the data is dynamic, these characteristics raise new challenges for the data's storage and administration, in this context, the NoSQL database comes into being. The article compares and analyzes the general...
In the cloud testing environment, the virtual machine is a large scale of the testing resources. Users usually require its operation stability, and would not like to see the phenomenon of frequent migration of virtual machines during the test. Therefore, how to implement the optimized deployment of virtual machine effectively is a very important aspect of the cloud platform. This paper presents an...
The edge ringing artifacts often appear nearby the image edge for the deconvolution bias. A new post filtering is proposed to remove the edge ringing artifact in the deconvolution image. The experimental results validate the proposed edge ringing artifact filtering algorithms perform well.
Spatial publish subscribe (SPS) is a basic primitive underlying many real-time, interactive applications such as online games or discrete-time simulations. Supporting SPS on a large-scale, however, requires sufficient resources and proper load distribution among the simulation units. For load distribution, existing mechanisms either use a static partitioning, such that over-provisioning or overloading...
Spatial publish subscribe (SPS) is a basic primitive underlying many real-time, interactive applications such as online games or discrete-time simulations. Voronoi Self-organizing Overlay (VSO) is a scalable SPS service designed to adjust workload automatically to avoid system overload or underload. We investigate the deployment of VSO on Planet Lab, to evaluate whether it is feasible to scale up...
The edge ringing artifacts always appear near the image edge after deconvolution and degrade the image quality. In this paper, we presented a new deconvolution image edge ringing metric to evaluate the quality of image. The proposed approach is able to remove the deconvolution image edge ringing artifact by using a PDE (Partial Differential Equation)-based method and it will be compared with the degraded...
Supporting real-world activities online has been one of the main goals in applied computer science. However, the gathering of a large crowd for a specific purpose (e.g., lecture, concert, rally), has not yet moved online. The recent concept of crowdcasting (i.e., broadcasting to an audience while engaging them with real-time feedback) may pave the way towards it, but the audience scale and feedback...
Interaction Distribution Networks (IDNs) are systems designed to deliver small, interactive data streams in a scalable manner. Compared with Content Distribution Network (CDN), which serves relatively static and bulky data, IDNs may be more suited for latency-sensitive bi-directional interactive streams such as network games or real-time conferencing. Although existing instant messenger (IM) or massively...
Rate adaptation (RA) is a mechanism unspecified by the 802.11 standards, yet critical to the system performance. Although many different design directions have been studied the past years [1]–[14], there are still little insights learned of how short-term channel's past performance can be utilized to limit transmissions at low throughput rates. In this paper, we conduct a systematic experimental study...
Outlier detection is an important problem for many domains, including fraud detection, network intrusion and medical diagnosis. Discovery of unexpected knowledge revealed from outliers is becoming an integral aspect of data mining. Existing works in this field fall short of the adaptability to the distributive feature of the dataset. This paper presents a novel approach for outlier detection with...
Reasonable channel assignment is one of the key research contents of the multi-channel assignment algorithms. A distributed channel assignment method based on partition of interface function was proposed in this paper. Different channel assigning or switching algorithms for interfaces with different function were used: Channel assigning algorithm based on measuring time to gateway was used for station...
As the popularity of WebVR applications rises in recent years, a great disparity exists between the huge 3D content on servers and the limited cache capacity on clients. In order to alleviate server loading, peer-to-peer (P2P)-based 3D content distribution has been proposed recently. However, given the limited cache sizes at clients, how to maintain and replace the cache content effectively becomes...
Large web search engines have to answer thousands of queries per second with interactive response times under tight latency constraints. Query processing is a major cost factor in operating large web search engines. To keep up with this immense workload, a number of techniques such as caching, index compression, and index and query pruning are used to improve scalability. We focus on two techniques,...
Result caching is an efficient technique for reducing the query processing load, hence it is commonly used in search engines. In this paper, we study query result caching and proposes a cache management policy for achieving higher hit ratios compared to traditional heuristics methods. Our cache management policy comprises an eviction policy and an admission policy, and it divides the memory allocated...
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