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71.
Spyridon J. Hatjispyros Theodoros NicolerisStephen G. Walker 《Computational statistics & data analysis》2011,55(6):2011-2025
An approach to modeling dependent nonparametric random density functions is presented. This is based on the well known mixture of Dirichlet process model. The idea is to use a technique for constructing dependent random variables, first used for dependent gamma random variables. While the methodology works for an arbitrary number of dependent random densities, with each pair having their own dependent structure, the mathematics and estimation algorithm is focused on two dependent random density functions. Simulations and a real data example are presented. 相似文献
72.
Thanassis Perperis Theodoros Giannakopoulos Alexandros Makris Dimitrios I. Kosmopoulos Sofia Tsekeridou Stavros J. Perantonis Sergios Theodoridis 《Expert systems with applications》2011,38(11):14102-14116
In this paper we present our research results towards the detection of violent scenes in movies, employing advanced fusion methodologies, based on learning, knowledge representation and reasoning. Towards this goal, a multi-step approach is followed: initially, automated audio and visual analysis is performed to extract audio and visual cues. Then, two different fusion approaches are deployed: (i) a multimodal one that provides binary decisions on the existence of violence or not, employing machine learning techniques, (ii) an ontological and reasoning one, that combines the audio-visual cues with violence and multimedia ontologies. The latter reasons out not only the existence of violence or not in a video scene, but also the type of violence (fight, screams, gunshots). Both approaches are experimentally tested, validated and compared for the binary decision problem of violence detection. Finally, results for the violence type identification are presented for the ontological fusion approach. For evaluation purposes, a large dataset of real movie data has been populated. 相似文献
73.
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
74.
Nikolaos B. Kyriakidis Panagiotis E. Athanasopoulos Theodoros Karamanolis 《Food Additives & Contaminants》2001,18(4):309-313
The degradation of azinphos methyl in orange and peach juice was studied. The insecticide was aseptically added to packed orange and peach juices and stored at 40, 20 and 0°C. Samples were removed at regular intervals and were analysed for residues of azinphos methyl. Residues were determined with a simple gas-chromatographic method using a 30m glass capillary column and an NP detector. The recoveries of azinphos methyl were 87-110% for orange juice and 92-108% for peach juice, and the limit of determination was 0.004mg/kg for both juices. From the experimental data, rate constants, half-lives, and times needed to reach legal limits for the decomposition of azinphos methyl in orange and peach juices were evaluated. Half-lives for orange and peach juices were 6.5 and 7.8 days at 40°C, 86.6, and 92.4 days at 20°C, and 407.7 and 495.1 days at 0°C, respectively. 相似文献
75.
76.
77.
Frey M. Wenninger G. Krutzsch B. Koltsakis G. C. Haralampous O. A. Samaras Z. C. 《Topics in Catalysis》2007,42(1-4):237-245
The objective of this work is to study the regeneration performance of a heavy-duty DPF application. The simulation of the
local temperatures and pressure drop during the regeneration could be validated with experimental data, indicating the need
for a 2D model approach to describe this particular catalysed DPF configuration. Furthermore, the model was applied to illustrate
the axial and radial regeneration phenomena focusing on soot and temperature distribution. 相似文献
78.
Analytical modelling of plastic behaviour of uniformly FRP confined concrete members 总被引:1,自引:0,他引:1
Theodoros C. Rousakis Athanasios I. Karabinis Panos D. Kiousis Ralejs Tepfers 《Composites Part B》2008,39(7-8):1104-1113
A method is presented for the assessment and calibration of the elastoplastic behaviour of FRP confined concrete. The method is based on the evaluation of permanent deformations from observed experimental deformations and theoretical elastic response of confined concrete. The inelastic response of concrete and the parameters of its mathematical modelling are investigated. Closed form expressions are produced to relate the model parameters to the mechanical properties of the material. A strain-hardening Drucker–Prager model is developed which simulates both the hardening and softening material response with reasonable agreement to the experimental observations. The predictive ability of the model is verified through comparisons to numerous published experimental data and analytical models. 相似文献
79.
Locating objects in mobile computing 总被引:7,自引:0,他引:7
In current distributed systems, the notion of mobility is emerging in many forms and applications. Mobility arises naturally in wireless computing since the location of users changes as they move. Besides mobility in wireless computing, software mobile agents are another popular form of moving objects. Locating objects, i.e., identifying their current location, is central to mobile computing. We present a comprehensive survey of the various approaches to the problem of storing, querying, and updating the location of objects in mobile computing. The fundamental techniques underlying the proposed approaches are identified, analyzed, and classified along various dimensions 相似文献
80.
Theodoros Kostoulas Thomas Winkler Todor Ganchev Nikos Fakotakis Joachim Köhler 《Language Resources and Evaluation》2013,47(2):539-563
The MoveOn speech and noise database was purposely designed and implemented in support of research on spoken dialogue interaction in a motorcycle environment. The distinctiveness of the MoveOn database results from the requirements of the application domain—an information support and operational command and control system for the two-wheel police force—and also from the specifics of the adverse open-air acoustic environment. In this article, we first outline the target application, motivating the database design and purpose, and then report on the implementation details. The main challenges related to the choice of equipment, the organization of recording sessions, and some difficulties that were experienced during this effort, are discussed. We offer a detailed account of the database statistics, the suggested data splits in subsets, and discuss results from automatic speech recognition experiments which illustrate the degree of complexity of the operational environment. 相似文献