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排序方式: 共有367条查询结果,搜索用时 15 毫秒
71.
Terence C. Lau Jianguo Lu John Mylopoulos Kostas Kontogiannis 《Information Systems Frontiers》2003,5(2):149-160
As technology evolves, many organizations face the problem of migrating legacy applications from one technology base to another. We report on a case study involving the migration of legacy code into the IBM® WebSphere® Commerce Suite product. Specifically, we focus on the problem of migrating applications that use traditional database access techniques to applications using the Enterprise JavaBean (EJB) programming model. Our results include a practical methodology that facilitates such migration, as well as a tool that supports this methodology. The tool has been released on IBM's alphaWorks site. 相似文献
72.
Hossein Azari Irene Cheng Kostas Daniilidis Anup Basu 《Computer Vision and Image Understanding》2012,116(1):38-53
In multiview 3D TV, a pair of corresponding pixels in adjacent 2D views contributes to the reconstruction of voxels (3D pixels) in the 3D scene. We analyze this reconstruction process and determine the optimal pixel aspect ratio based on which the estimated object position can be improved given specific imaging or viewing configurations and constraints. By applying mathematical modeling, we deduce the optimal solutions for two general stereo configurations: parallel and with vergence. We theoretically show that for a given total resolution a finer horizontal resolution, compared to the usual uniform pixel distribution, in general, provides a better 3D visual experience for both configurations. The optimal value may vary depending on different configuration parameter values. We validate our theoretical results by conducting subjective studies using a set of simulated non-square discretized red–blue stereo pairs and show that human observers indeed have a better 3D viewing experience with an optimized vs. a non-optimized representation of 3D-models. 相似文献
73.
The compatibility of epoxidized poly(cis-1,4-butadiene) (EPB) with chlorinated polyvinylchloride (CPVC) was investigated. Blends studied covered the complete composition range using EPB at two degrees of epoxidation: 20 and 43 mol % oxirane units. Tensile properties of EPB (63)/CPVC were also studied at the 50/50 composition. Dynamic mechanical analysis (DMA) showed that both sets of blends were miscible at the segmental level except for the rich CPVC compositions. All blends showed good tensile properties. even those where DMA indicated phase separation. This may be attributed to strong segmental interactions of the donnor-acceptor type between the oxirane and acidic-hydrogen-containing groups of these complementary dissimilar blend partners. 相似文献
74.
Multimedia Tools and Applications - Big Data (BD) is a new technology which rapidly growing in the telecommunications sectors, especially in the contemporary field of wireless telecommunications.... 相似文献
75.
Ioannis Kitsos Kostas Magoutis Yannis Tzitzikas 《Distributed and Parallel Databases》2014,32(3):405-446
Although Web Search Engines index and provide access to huge amounts of documents, user queries typically return only a linear list of hits. While this is often satisfactory for focalized search, it does not provide an exploration or deeper analysis of the results. One way to achieve advanced exploration facilities exploiting the availability of structured (and semantic) data in Web search, is to enrich it with entity mining over the full contents of the search results. Such services provide the users with an initial overview of the information space, allowing them to gradually restrict it until locating the desired hits, even if they are low ranked. This is especially important in areas of professional search such as medical search, patent search, etc. In this paper we consider a general scenario of providing such services as meta-services (that is, layered over systems that support keywords search) without a-priori indexing of the underlying document collection(s). To make such services feasible for large amounts of data we use the MapReduce distributed computation model on a Cloud infrastructure (Amazon EC2). Specifically, we show how the required computational tasks can be factorized and expressed as MapReduce functions. A key contribution of our work is a thorough evaluation of platform configuration and tuning, an aspect that is often disregarded and inadequately addressed in prior work, but crucial for the efficient utilization of resources. Finally we report experimental results about the achieved speedup in various settings. 相似文献
76.
77.
Nikos Papadakis Kostas Stravoskoufos Evdoxios Baratis Euripides G.M. Petrakis Dimitris Plexousakis 《Expert systems with applications》2011,38(12):14660-14667
We present PROTON, a reasoner for managing temporal information over OWL ontologies. We adopt the so called 4d-fluent or 4-dimensionalist approach for representing temporal information in ontologies i.e. for time points or intervals and for events that occur in time points or intervals. Also, we propose an extension to the situation calculus in order to encapsulate time. PROTON is implemented using this extension. 相似文献
78.
Overlay networks for task allocation and coordination in large-scale networks of cooperative agents 总被引:1,自引:0,他引:1
Panagiotis Karagiannis George Vouros Kostas Stergiou Nikolaos Samaras 《Autonomous Agents and Multi-Agent Systems》2012,24(1):26-68
This paper proposes a novel method for scheduling and allocating atomic and complex tasks in large-scale networks of homogeneous
or heterogeneous cooperative agents. Our method encapsulates the concepts of searching, task allocation and scheduling seamlessly
in a decentralized process where no accumulated or centralized knowledge or coordination is necessary. Efficient searching
for agent groups that can facilitate the scheduling of tasks is accomplished through the use of a dynamic overlay structure
of gateway agents and the exploitation of routing indices. The task allocation and the scheduling of complex tasks are accomplished
by combining dynamic reorganization of agent groups and distributed constraint optimization methods. Experimental results
display the efficiency of the proposed method. 相似文献
79.
The present paper attempts to identify the spatial patterns of soil nutrients in the abandoned Haizhou opencast coal mine and waste disposal site, in China. A geostatistical approach was used to overcome problems due to the heterogeneity of the site (some parts have been abandoned for more than 30 years, lack of clean soil, presence of overburden and low-grade ore, co-disposal of wastes from adjacent sites) and the limited number of available samples. One hundred and eight soil samples were collected from an area of 332 ha and analyzed for pH, organic matter (OM), NH4–N, available phosphorus (AP) and available potassium (AK). The results indicate that nutrients exhibit different spatial distribution and only NH4–N showed strong spatial dependence and a relatively large nugget effect. Relatively high content of OM, NH4–N, AP and AK was seen in the northeastern part, whereas pH was higher in central north and southern parts of the site. The determination of the spatial variability and heterogeneity of nutrients in mining and waste disposal sites assesses the need for amendments and assists in the selection of the most feasible revegetation scheme. 相似文献
80.
Kim Byung-Gyu Hong Gwang-Soo Psannis Kostas E. 《Multimedia Tools and Applications》2017,76(21):22741-22759
Multimedia Tools and Applications - The accelerated development of IT technologies on the Internet for fast provision of commercial multimedia services has stimulated an urgent demand for reliable... 相似文献