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排序方式: 共有121条查询结果,搜索用时 0 毫秒
1.
Jimeng Sun Charalampos E. Tsourakakis Evan Hoke Christos Faloutsos Tina Eliassi-Rad 《Data mining and knowledge discovery》2008,17(1):111-128
Data stream values are often associated with multiple aspects. For example each value observed at a given time-stamp from environmental sensors may have an associated type (e.g., temperature,
humidity, etc.) as well as location. Time-stamp, type and location are the three aspects, which can be modeled using a tensor
(high-order array). However, the time aspect is special, with a natural ordering, and with successive time-ticks having usually
correlated values. Standard multiway analysis ignores this structure. To capture it, we propose 2 Heads Tensor Analysis (2-heads), which provides a qualitatively different treatment on time. Unlike most existing approaches that use a PCA-like
summarization scheme for all aspects, 2-heads treats the time aspect carefully. 2-heads combines the power of classic multilinear
analysis with wavelets, leading to a powerful mining tool. Furthermore, 2-heads has several other advantages as well: (a)
it can be computed incrementally in a streaming fashion, (b) it has a provable error guarantee and, (c) it achieves significant
compression ratio against competitors. Finally, we show experiments on real datasets, and we illustrate how 2-heads reveals
interesting trends in the data. This is an extended abstract of an article published in the Data Mining and Knowledge Discovery
journal. 相似文献
2.
Markus Lazar Charalampos Anastassiadis 《International Journal of Engineering Science》2006,44(20):1571-1582
In this paper, following Noether’s theorem we investigate Lie point symmetries of linear theories of microstretch elasticity and micromorphic elasticity. We restrict our consideration to isotropic, compatible and homogeneous materials. Conservation and balance laws are derived, thereby extending results from micropolar elasticity. 相似文献
3.
Assessment of a modification to the Brinell method for determining solid wood hardness 总被引:1,自引:0,他引:1
Charalampos Lykidis Miltiadis Nikolakakos Evaggelos Sakellariou Dimitrios Birbilis 《Materials and Structures》2016,49(3):961-967
Purpose of this study was to assess a modification to the hardness determination method in order to mitigate the effect of visual measurements on the consistency of Brinell method and accuracy of the results. The amendment has been previously proposed by other researchers and refers to the automated determination of indentation diameter and relies on the ability of modern testing machines to accurately measure indentation depth, through which the calculation of indentation diameter is possible. From the results of this study it was shown that the hardness values acquired by the proposed modification presented statistically significant difference compared to those acquired using the visual method described in EN1534 (Wood and parquet flooring—determination of resistance to indentation (Brinell)—test method, 2000). Moreover, compared to the standard methodology, the application of the proposed amendment led to hardness values which are better correlated to density as well as Janka hardness for the six different solid wood species tested. Furthermore, the proposed modification resulted to hardness values which seem to be less affected by the presence of varnish coatings. 相似文献
4.
5.
Katerina Diamantaki Charalampos Rizopoulos Dimitris Charitos Nikos Tsianos 《Personal and Ubiquitous Computing》2011,15(1):37-49
Multiuser location-aware applications present a new form of mediated communication that takes place within a digital as well
as a physical spatial context. The inherently hybrid character of locative media use necessitates that the designers of such
applications take into account the way communication and social interaction is influenced by contextual elements. In this
paper, an investigation into the communicational and social practices of users who participate in a location-based game is
presented, with an emphasis on group formation and dynamics, interpersonal communication, and experienced sense of immersion.
This investigation employs a methodological approach that is reliant on both qualitative and quantitative data analysis. A
series of this user experience study’s results are presented and discussed. 相似文献
6.
Charalampos Konstantopoulos Andreas Svolos Christos Kaklamanis 《Concurrency and Computation》2000,12(5):289-309
Motion estimation is widely used in video coding schemes in order to reduce the inherent temporal redundancy among the frames of a video stream. In particular, low and very low bit rate video coding schemes need sophisticated motion models which usually require a large number of arithmetic operations. In this paper we present a parallel algorithm for the most practical of these models. Specifically we implement the affine motion model on a hypercube‐based multiprocessor. This model covers the most usual kinds of motion and requires only a modest number of arithmetic operations. Also, the hypercube network can efficiently handle the non‐regular data flow resulting from the parallel implementation of this model. In addition, we assume that our multiprocessor is fine grained, in contrast to most programmable architectures used in video coding, where processors usually have large local memory. Apart from its practicality, the constraint of limited local memory makes the algorithm design more challenging and thus more theoretically interesting. Finally, with regard to other proposals in the literature, our scheme is more general: whereas our scheme covers all kinds of motion supported by the affine motion model, the rest of the proposals deal only with a subset of these kinds. Copyright © 2000 John Wiley & Sons, Ltd. 相似文献
7.
Chrysovalantou Ziogou Dimitris Ipsakis Fotis Stergiopoulos Simira Papadopoulou Stella Bezergianni Spyros Voutetakis 《International Journal of Hydrogen Energy》2012
An autonomous power system that exploits solar energy for the production of hydrogen through water electrolysis is fully assessed in terms of system implementation and optimal operating strategy. A 10 kWp photovoltaic array supplies energy to a PEM electrolyzer rated at 6.9 kWp. In order to maintain a smooth operation regardless of the inherent weather fluctuations, a 1000 Ah/24 V lead–acid accumulator stores energy excess and provides it when needed. The monitoring and control of the system is implemented through a Supervisory Control and Data Acquisition system (SCADA), while the interactions between electrical and chemical subsystems are addressed by a complete automation infrastructure. The mathematical models of each subsystem are validated based on real operational data and a model-based power management strategy is proposed and assessed through a parameter sensitivity analysis. Further on, an off-line optimization framework is evaluated regarding the optimal operation of the system in two diverse, but representative time periods. The optimal parameters are identified and their effect on hydrogen production and accumulator utilization is reported. 相似文献
8.
Grigorios Itskos Pradeep K. Rohatgi Angeliki Moutsatsou John D. DeFouw Nikolaos Koukouzas Charalampos Vasilatos Benjamin F. Schultz 《Journal of Materials Science》2012,47(9):4042-4052
Eight types of A356 Al–fly ash composites were produced by pressure infiltration of high-Ca lignite fly ash. This type of
ash was used for the first time in Al-composites synthesis, and particularly by liquid metal infiltration techniques. After
examining mineralogy and chemistry, specific, narrow ash size fractions were used for the synthesis of composites, and properties
linked to microstructure and wear strength of the materials. The effect of using ground ash particles on the microstructure
and tribological performance of the composites was also investigated. It was concluded that using fine, high-Ca ash particles
can improve the properties of composites, and that using ash particles in a ground form can better facilitate the production
process of MMCs. 相似文献
9.
10.
The presence of specific chemical additives in the redox electrolyte results in an efficient increase of the photovoltaic
performance of dye-sensitized solar cells (DSCs). The most effective additives are 4-tert-butylpyridine (TBP), N-methylbenzimidazole (NMBI) and guanidinium thiocyanate (GuNCS) that are adsorbed onto the photoelectrode/electrolyte interface,
thus shifting the semiconductor's conduction band edge and preventing recombination with triiodides. In a comparative work,
we investigated in detail the action of TBP and NMBI additives in ionic liquid-based redox electrolytes with varying iodine
concentrations, in order to extract the optimum additive/I2 ratio for each system. Different optimum additive/I2 ratios were determined for TBP and NMBI, despite the fact that both generally work in a similar way. Further addition of
GuNCS in the optimized electrolytic media causes significant synergistic effects, the action of GuNCS being strongly influenced
by the nature of the corresponding co-additive. Under the best operation conditions, power conversion efficiencies as high
as 8% were obtained. 相似文献