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VFDS: Very fast database sampling system

Teodora Sandra Buda, Thomas Cerqueus, John Murphy, Morten Kristiansen
2013 2013 IEEE 14th International Conference on Information Reuse & Integration (IRI)  
In a wide range of application areas (e.g. data mining, approximate query evaluation, histogram construction), database sampling has proved to be a powerful technique.  ...  In this paper we propose a very fast sampling method that maintains the referential integrity of the sample database intact.  ...  VFDS In this section, we describe the VFDS (Very Fast Database Sampling) system which is designed to produce a database sample from a relational database.  ... 
doi:10.1109/iri.2013.6642466 dblp:conf/iri/BudaCMK13 fatcat:rl7rul66pffknkmaijatnhzama

Generation of test databases using sampling methods

Teodora Sandra Buda
2013 Proceedings of the 2013 International Symposium on Software Testing and Analysis - ISSTA 2013  
In this research, we propose two database sampling methods, VFDS and CoDS, with the objective of populating the testing environment.  ...  Database sampling from the production environment is a potential solution to overcome these challenges.  ...  We propose VFDS (Very Fast Database Sampling) for solving the first three objectives.  ... 
doi:10.1145/2483760.2492397 dblp:conf/issta/Buda13 fatcat:t7vc3zdxu5a7jdnpqs65a6tsiu

Detecting VoIP Floods Using the Hellinger Distance

H. Sengar, Haining Wang, D. Wijesekera, S. Jajodia
2008 IEEE Transactions on Parallel and Distributed Systems  
Nevertheless, being an application running over the TCP/IP suite, it is susceptible to flooding attacks.  ...  As a solution, we offer the VoIP Flooding Detection System (vFDS)-an online statistical anomaly detection framework that generates alerts based on abnormal variations in a selected hybrid collection of  ...  ACKNOWLEDGMENTS An earlier version of this paper [29] was presented in the Proceedings of the 14th International Workshop on Quality of Service (IWQoS '06).  ... 
doi:10.1109/tpds.2007.70786 fatcat:7ujrcwgvmbc7vdee2fyytbww4a

Fast Detection of Denial-of-Service Attacks on IP Telephony

Hemant Sengar, Haining Wang, Duminda Wijesekera, Sushil Jajodia
2006 IEEE International Workshop on Quality of Service, IWQoS  
In this paper, we present an online statistical detection mechanism, called vFDS, to detect DoS attacks in the context of VoIP.  ...  Our experimental results show that vFDS achieves fast and accurate detection of DoS attacks.  ...  [20] are the closest to our work. TLAS is based on TCP protocol behavior of (SYN, ACK) pairs.  ... 
doi:10.1109/iwqos.2006.250469 dblp:conf/iwqos/SengarWWJ06 fatcat:toxvdhwkkfggnpvfzvgx2m3eka

Detection of Intruders and Flooding In Voip Using IDS, Jacobson Fast And Hellinger Distance Algorithms

A Rahul
2012 IOSR Journal of Computer Engineering  
VoIP Flood Detection System (VFDS) is aimed to detect TCP Flooding attacks and SIP Flooding attacks on SIP devices using Jacobian Fast and Hellinger distance algorithms.  ...  The Jacobian Fast Algorithm fixes the threshold limit and Hellinger distance calculation is a statistical anomaly based algorithm uses to detect deviation in traffic  ...  Our threshold is an instance of Jacobson's Fast algorithm for RTT mean and variation [6] .  ... 
doi:10.9790/0661-0223036 fatcat:7zsr6jmnxzeppkkrdoge63ohqq

Antibiotic Resistance Gene Diversity and Virulence Gene Diversity Are Correlated in Human Gut and Environmental Microbiomes

Pedro Escudeiro, Joël Pothier, Francisco Dionisio, Teresa Nogueira, Paul D. Fey
2019 mSphere  
In the human gut, there are less ARd and VFd than in more diversified environments, and yet correlations between the ARd and VFd are stronger.  ...  They can vary from very high in Malawi, where antibiotic consumption is unattended, to nonexistent in the uncontacted Amerindian population.  ...  On the other hand, human gut microbiomes harbor a less diverse VF repertoire, especially in the U.S. samples, which seems to indicate an evolution toward adaptation to the human gut or less contact with  ... 
doi:10.1128/msphere.00135-19 pmid:31043514 pmcid:PMC6495336 fatcat:md446vqv6ffofanw6b27wi2fuy

Applicability of Existing Objective Metrics of Perceptual Quality for Adaptive Video Streaming

Jacob Søgaard, Lukáš Krasula, Muhammad Shahid, Dogancan Temel, Kjell Brunnström, Manzoor Razaak
2016 IS&T International Symposium on Electronic Imaging Science and Technology  
Objective video quality metrics are designed to estimate the quality of experience of the end user.  ...  In VQM-VFD a neural network is used to map the values of the eight parameters to an overall measure of distortion.  ...  Some methods, which are more general, are more robust to this (such as PSNR, SSIM, MS-SSIM, VQM, PEVQ-S, and VQM-VFD), while other methods are much more tailored to specific problems.  ... 
doi:10.2352/issn.2470-1173.2016.13.iqsp-206 fatcat:y4iiiwd6rfbv5klb2w3puxnuti

A Voxelized Fractal Descriptor for 3D Object Recognition

Jose Francisco Domenech, Felix Escalona, Francisco Gomez-Donoso, Miguel Cazorla
2020 IEEE Access  
Experiments were made possible by a generous hardware donation from NVIDIA.  ...  FIGURE 1 : 1 The process to generate a VFD from an input point cloud. are in Sec.  ...  The process to generate the VFD from an input point cloud is as follows: first, a point cloud is obtained. The points are not required to be sorted by any mean.  ... 
doi:10.1109/access.2020.3021455 fatcat:jwyml3m5pff7nanlawj6nadg5i

Several insights into the preprocessing of electrograms in atrial fibrillation for dominant frequency analysis

Wenhai Li, Cuiwei Yang, Yanlei Wang, Dexi Wang, Ying Chen, Zhong Wu
2016 BioMedical Engineering OnLine  
The analysis of the atrial electrical activity plays an important  ...  The influence of VFDs on DF It is necessary to estimate the influence of VFDs on atrial fundamental frequency.  ...  The effect of signal sampling frequency on DF Figure 9 shows an example about the impact on the DF results when the sampling rate of epicardial mapping signals down from 2 kHz to different rates (Fig  ... 
doi:10.1186/s12938-016-0157-2 pmid:27067549 pmcid:PMC4828784 fatcat:zmh3xvilkjasxfmazkqcz4wcxy

Algorithm development for non-intrusive load monitoring for verification and diagnostics

Christopher E. Reeg, Thomas J. Overbye
2010 North American Power Symposium 2010  
An algorithm currently under development, specifically developed for the low resolution of inexpensive commercial sensor packages, will be discussed and demonstrated.  ...  This is in contrast to intrusive monitoring where end use devices are sensed.  ...  Fig. 1 - 1 Six minute time sample of real (top trace power data. This specific signature is being generated by an always maker.  ... 
doi:10.1109/naps.2010.5619600 fatcat:rb5j6m4ujrgf7doj5qm25cqozu

Dynamic Analysis of R.C. Frame Building Using Energy Dissipation Devices: A Review

Rakesh Patwa
2018 International Journal for Research in Applied Science and Engineering Technology  
A passive energy dissipation devices used in building to improve the seismic response during the earthquake.  ...  Haskell (2007) the application of VFD devices as part of seismic energy dissipation systems for buildings and bridges has been experimentally and analytically studied.  ...  VISCOUS FLUID DAMPER (VFD) Viscous fluid dampers is one of the damping devices that often used in aerospace and military ion and recently been adopted for structure application.  ... 
doi:10.22214/ijraset.2018.5400 fatcat:4gkosrew3jgq3brdwrclxiy7ja

VR for Cultural Heritage [chapter]

Francesco Fassi, Alessandro Mandelli, Simone Teruggi, Fabrizio Rechichi, Fausta Fiorillo, Cristiana Achille
2016 Lecture Notes in Computer Science  
Three main topics, consequentially related, will be here addressed: (i) the survey of the structure, meant to update the old drawings; (ii) the construction of an accurate and detailed 3D model to be used  ...  The second was the possibility to use this technology to virtually explore the cathedral from a technical point of view: by using an immersive visualization technology, operators can improve their understanding  ...  , and finally to the connection of the VR application to the technical BIM database.  ... 
doi:10.1007/978-3-319-40651-0_12 fatcat:zlcwvodvgnbkziae4gfnwkltje

On Proposing a Non-intrusive Device and Methodology to Monitor Motor Degradation

Henrique Cafruni Kuhn, Rodrigo da Rosa Righi, Cesar David Paredes Crovato
2021 Journal of King Saud University: Engineering Sciences  
Monitoring the degradation of induction motors is an essential concern for industries, especially when there are high costs related to maintenance and their stops.  ...  This is an open access article under the CC BY-NC-ND license (  ...  Acknowledgements The authors would like to thank to: HTR Micron company, FAPERGS, CAPES and CNPq.  ... 
doi:10.1016/j.jksues.2021.04.007 fatcat:lmnx4qizzfcmdhp2mced6cajme

Real-time neuro-fuzzy controller for pressure adjustment in water distribution systems

Hugo Augusto Marinho Moreira, Heber Pimentel Gomes, Juan Moises Mauricio Villanueva, Saulo de Tarso Marques Bezerra
2020 Water Science and Technology : Water Supply  
Fuzzy, neural and neuro-fuzzy controllers were tested in an experimental setup to compare their performances in a transient regime, a permanent regime, and with respect to disturbances applied to the system  ...  The results demonstrate that the neuro-fuzzy controller (NFC) presented a significant increase in pumping system efficiency and a reduction in specific energy consumption of up to 392% when compared to  ...  For the acquisition of training data, a frequency of sampling equal to 100 samples/s was used, estimating an average value for every 10 samples to reduce variations during data acquisition.  ... 
doi:10.2166/ws.2020.379 fatcat:dyluycvnxff3tbhvdbiapbu454

Closed-Loop Drive Detection and Diagnosis of Multiple Combined Faults in Induction Motor Through Model-Based and Neuro-Fuzzy Network Techniques

Imadeddine Harzelli, Abdelhamid Benakcha, Tarek Ameid, Arezki Menacer
2021 Journal of Modeling and Optimization  
Therefore, two techniques are applied: the model-based strategy, which is an online method used to generate residual stator current signal in order to indicate the presence of possible failures by means  ...  However, the MANAFIS required a relevant database to achieve satisfactory results.  ...  The noise generated by a VFD reduces its signal to noise ratio (SNR). A white Gaussian noise of 10 dB of SNR (low SNR) added to the output voltages (Ua, Ub, Uc), in order to model the other noise.  ... 
doi:10.32732/jmo.2021.13.2.58 fatcat:xpifd6psfrhh7mhq5rbcy3dikq
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