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101.
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
102.
The evaluation of the economic efficiency of regulatory schemes is essential for regulators and utilities. In this study it is analysed for the first time the welfare costs of non-marginal cost pricing in the water supply in England and Wales, by computing the deadweight loss of the water only companies (WoCs) that existed over the period of 1993–2009. The results indicate that the current price schemes can have substantial efficiency costs. Our estimates show that the loss of efficiency for the WoCs lies between 15 and 60 million GBP over the period 1993–2009. These amounts could have been redistributed either to the companies in terms of profits or to the consumers via price reductions. The methodology and results of this study are of great interest for both regulators and water utilities managers to evaluate the effectiveness of price regulation and make informed decisions. 相似文献
103.
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105.
Alexandros André Chaaraoui Pau Climent-Pérez Francisco Flórez-Revuelta 《Expert systems with applications》2012,39(12):10873-10888
Human Behaviour Analysis (HBA) is more and more being of interest for computer vision and artificial intelligence researchers. Its main application areas, like Video Surveillance and Ambient-Assisted Living (AAL), have been in great demand in recent years. This paper provides a review on HBA for AAL and ageing in place purposes focusing specially on vision techniques. First, a clearly defined taxonomy is presented in order to classify the reviewed works, which are consequently presented following a bottom-up abstraction and complexity order. At the motion level, pose and gaze estimation as well as basic human movement recognition are covered. Next, the mainly used action and activity recognition approaches are presented with examples of recent research works. Increasing the degree of semantics and the time interval involved in the HBA, finally the behaviour level is reached. Furthermore, useful tools and datasets are analysed in order to provide help for initiating projects. 相似文献
106.
Panayiotis Bilalis Eleni K. Efthimiadou Alexandros Chatzipavlidis Nikos Boukos George C. Kordas 《Polymer International》2012,61(6):888-894
Temperature and pH responsive poly(N‐isopropylacrylamide‐co‐methacrylic acid) (P(NIPAAm‐co‐MAA)) microcontainers with encapsulated magnetic nanoparticles in the shell were prepared by a two‐stage distillation precipitation polymerization. PMAA@Fe3O4/P(NIPAAm‐co‐MAA) core–shell nanoparticles were synthesized by the second‐stage polymerization of NIPAAm, MAA and N, N′‐methylenebisacrylamide as crosslinker in the presence of magnetic nanoparticles and PMAA as core. These novel triple‐functional microcontainers were prepared by selective removal of the PMAA core in water. Daunorubicin hydrochloride (DNR) was loaded into the microcontainers and the release profile was studied by UV–visible spectroscopy. The synthesized nanostructures were characterized with transmission and scanning electron microscopy, X‐ray diffraction and Fourier transform infrared spectroscopy. The magnetic properties were evaluated by vibrating sample magnetometry. The shrink and swelling behavior was studied by dynamic light scattering. Copyright © 2012 Society of Chemical Industry 相似文献
107.
Sofia Pegiadou-Koemtzopoulou Ioannis Eleftheriadis Aristidis Kehayoglou 《Journal of surfactants and detergents》1998,1(1):59-64
The complex-forming interaction between two direct dyes, CI Yellow 106 and CI Blue 78, and two nonionic surfactants, namely,
polyoxyethylene nonyl phenyl ether (NP-12) and polyoxyethylene stearylamine (R-11), in aqueous solutions was studied. The
estimation was made by measuring surface tension and critical micelle concentration (CMC) changes as a function of dye concentration.
A decrease of NP-12 surface tension at low concentration and an increase of R-11 surface tension in the presence of both dyes
were observed along with a significant decrease of NP-12 CMC values. A difference in the spectrophotometric absorbance of
dye solutions in the presence of both surfactants, indicating a change in the environment of the dye chromophore, was also
visible. These results confirm the formation of hydrophobic complexes of NP-12 and hydrophilic complexes of R-11 with both
dyes. 相似文献
108.
With biomass staying high in the EU political agenda and most of the recent documents acknowledging that it has the potential to make a very significant contribution to reaching the 20% target [7 and 6], the issue of supply in terms of feedstock types, availability constraints and costs in different Member States is set to determine the future technology uptake and market deployment prospects. 相似文献
109.
Neville A. Stanton James Brown Kirsten M. A. Revell Pat Langdon Mike Bradley Ioannis Politis Lee Skrypchuk Simon Thompson Alexandros Mouzakitis 《人机工程学与制造业中的人性因素》2022,32(1):89-101
Predicting what drivers will do as vehicle control is handed over to them from automation is a relatively new challenge for the motor vehicle industry. Operator Event Sequence Diagrams (OESDs) offer a way of modeling the interactions between the driver and vehicle automation in the handover of control. In this paper, two studies are presented in which a range of handover strategies are tested. The anticipated driver strategies were modeled using OESDs to serve as predictions of driver behavior. Drivers were then observed in two separate studies: (1) using a Lower-Fidelity (vehicle seat and controls) simulator and (2) using a Higher-Fidelity (whole vehicle) simulator. Driver behavior during a takeover task was categorized according to the signal detection paradigm into hits, misses, false alarms, and correct rejections. The results showed that for all strategies in both sets of studies, the median criterion for validity was exceeded ( > 0.8), suggesting that OESDs made good predictions of driver behavior during the handover of the vehicle from automation to manual control. 相似文献
110.
Konstantoudakis Konstantinos Breitgand David Doumanoglou Alexandros Zioulis Nikolaos Weit Avi Christaki Kyriaki Drakoulis Petros Christakis Emmanouil Zarpalas Dimitrios Daras Petros 《Multimedia Tools and Applications》2022,81(9):12211-12250
Multimedia Tools and Applications - Immersive 3D media is an emerging type of media that captures, encodes and reconstructs the 3D appearance of people and objects, with applications in... 相似文献