351 research outputs found
Comprehensive Border Bases for Zero Dimensional Parametric Polynomial Ideals
In this paper, we extend the idea of comprehensive Gr\"{o}bner bases given by
Weispfenning (1992) to border bases for zero dimensional parametric polynomial
ideals. For this, we introduce a notion of comprehensive border bases and
border system, and prove their existence even in the cases where they do not
correspond to any term order. We further present algorithms to compute
comprehensive border bases and border system. Finally, we study the relation
between comprehensive Gr\"{o}bner bases and comprehensive border bases w.r.t. a
term order and give an algorithm to compute such comprehensive border bases
from comprehensive Gr\"{o}bner bases.Comment: 15 pages, 8 sections and 3 algorithm
DxNAT - Deep Neural Networks for Explaining Non-Recurring Traffic Congestion
Non-recurring traffic congestion is caused by temporary disruptions, such as
accidents, sports games, adverse weather, etc. We use data related to real-time
traffic speed, jam factors (a traffic congestion indicator), and events
collected over a year from Nashville, TN to train a multi-layered deep neural
network. The traffic dataset contains over 900 million data records. The
network is thereafter used to classify the real-time data and identify
anomalous operations. Compared with traditional approaches of using statistical
or machine learning techniques, our model reaches an accuracy of 98.73 percent
when identifying traffic congestion caused by football games. Our approach
first encodes the traffic across a region as a scaled image. After that the
image data from different timestamps is fused with event- and time-related
data. Then a crossover operator is used as a data augmentation method to
generate training datasets with more balanced classes. Finally, we use the
receiver operating characteristic (ROC) analysis to tune the sensitivity of the
classifier. We present the analysis of the training time and the inference time
separately
Gain enhancement design of Aperture Coupled mpa at1.5 GHz
Micro strip patch antenna by default is low cost small in size easy to fabricate but have lower gain. In this research paper we have designed an antenna coupling is provided to increase the gain. The mathematical model is based on transmission line design at 1.5 GHz is simulated parametric study is made The VSWR directivity are within acceptable limits
Optimal Detection of Faulty Traffic Sensors Used in Route Planning
In a smart city, real-time traffic sensors may be deployed for various
applications, such as route planning. Unfortunately, sensors are prone to
failures, which result in erroneous traffic data. Erroneous data can adversely
affect applications such as route planning, and can cause increased travel
time. To minimize the impact of sensor failures, we must detect them promptly
and accurately. However, typical detection algorithms may lead to a large
number of false positives (i.e., false alarms) and false negatives (i.e.,
missed detections), which can result in suboptimal route planning. In this
paper, we devise an effective detector for identifying faulty traffic sensors
using a prediction model based on Gaussian Processes. Further, we present an
approach for computing the optimal parameters of the detector which minimize
losses due to false-positive and false-negative errors. We also characterize
critical sensors, whose failure can have high impact on the route planning
application. Finally, we implement our method and evaluate it numerically using
a real-world dataset and the route planning platform OpenTripPlanner.Comment: Proceedings of The 2nd Workshop on Science of Smart City Operations
and Platforms Engineering (SCOPE 2017), Pittsburgh, PA USA, April 2017, 6
page
A Wideband Microstrip Antenna with EBG Structure and Superstrate
A microstrip patch antenna withEBG structure and a dielectric layer have noteworthy effect on its input characteristics and band width. In this paper we studied both electromagnetic band-gap structure and a superstrate to increasing bandwidth of micrstrip patch antenna. We calculated bandwidth with and without EBG to design an Antenna for resonance frequency 4GHz. And then apply superstrate in EBG structure. This antenna simulated on Ansoft HFSS designer software,impedance bandwidth ,VSWR ,return losses & smith charts are observed and experimentally studied .Details of simulated results are presented and discussed
Study of Challenges Associated with Hybrid Renewable Energy Resources
Due to the fact that solar and wind energy are intermittent and unpredictable, greater penetration of their types into existing power systems, especially weak grids or island systems without adequate and sufficient storage capacity, could cause and create high technical problems . By integrating the two renewable resources in an optimal combination, the effects of the different nature of solar and wind resources can be partially offset and the overall system becomes more reliable and economical to use. This article discusses grid quality problems with grid connected renewable energy sources and grid quality problems are harmonics and voltage and frequency fluctuations as well as a description of grid connected PV generation system in this article
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