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71.
Esteves Carlos Allen-Blanchette Christine Makadia Ameesh Daniilidis Kostas 《International Journal of Computer Vision》2020,128(3):588-600
International Journal of Computer Vision - We address the problem of 3D rotation equivariance in convolutional neural networks. 3D rotations have been a challenging nuisance in 3D classification... 相似文献
72.
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
73.
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
74.
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
75.
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
76.
Emmanouil Ergazakis Kostas Ergazakis Dimitrios Askounis Yannis Charalabidis 《Telematics and Informatics》2011
This paper deals with the problem of the low ICT adoption rate by many cities or urban regions. The consequences of the poor ICT environment in these authorities may be summarized into (i) the cutback of local business competitiveness, (ii) the incapability of attracting new business investments, (iii) the poor service of citizens needs (living in the local area or abroad – a foreign country or another city, namely emigrants), (iv) the poor service of visitors that have or want to have transactions in the local area. The main shortcomings of local authorities refer to lack of capabilities and expertise, negligence of local needs and urban characteristics, absence of ICT adoption models to local needs, ignorance of development and exploitation models etc. These regions need support so as to select the most appropriate ICT best practices, integrated them into their strategic plans and implement them with success. This procedure is particularly complex, since many factors and restrictions have to be considered. The overall objective of this paper is to illustrate the Digital City concept and to propose an integrated methodology for Digital City development that will act in a supportive way for the regions or cities that have low rates in ICT penetration and try to adopt ICT best practices into their core functions and services. 相似文献
77.
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
78.
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
79.
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
80.
In this paper the problem of tracking walking people with multiple moving robots is tackled. For this purpose we present an
adaptation to the Multiple Hypothesis Tracking method, which unlike classic MHT, allows for one-to-many associations between
targets and measurements in each hypothesis production cycle and is thus capable of operating in a scenario involving multiple
sensors. Derivation of hypotheses probabilities accounts for the continuously changing overlapping areas in fields of view
of the robots sensors and for detection uncertainty. In the context of three experiments involving people walking among moving
robots, the successful integration of our tracking algorithm to a real-world setup is assessed. 相似文献