Coupling of HV Distributions Systems through multiple point-to-point-DC-connections

2019 ◽  
Author(s):  
S. Schlegel ◽  
D. Westermann
Keyword(s):  
Multiple Point ◽  
Point To Point

scholarly journals Distributed Architecture for Unmanned Vehicle Services

Sensors ◽  
2021 ◽  
Vol 21 (4) ◽  
pp. 1477
Author(s):  
João Ramos ◽  
Roberto Ribeiro ◽  
David Safadinho ◽  
João Barroso ◽  
Carlos Rabadão ◽  
...  
Keyword(s):  
Remote Control ◽  
Mobile Networks ◽  
Modular Design ◽  
Unmanned Vehicles ◽  
Local Network ◽  
The Internet ◽  
Multiple Point ◽  
Distributed Architecture ◽  
Point To Point ◽  
Technical Effort

The demand for online services is increasing. Services that would require a long time to understand, use and master are becoming as transparent as possible to the users, that tend to focus only on the final goals. Combined with the advantages of the unmanned vehicles (UV), from the unmanned factor to the reduced size and costs, we found an opportunity to bring to users a wide variety of services supported by UV, through the Internet of Unmanned Vehicles (IoUV). Current solutions were analyzed and we discussed scalability and genericity as the principal concerns. Then, we proposed a solution that combines several services and UVs, available from anywhere at any time, from a cloud platform. The solution considers a cloud distributed architecture, composed by users, services, vehicles and a platform, interconnected through the Internet. Each vehicle provides to the platform an abstract and generic interface for the essential commands. Therefore, this modular design makes easier the creation of new services and the reuse of the different vehicles. To confirm the feasibility of the solution we implemented a prototype considering a cloud-hosted platform and the integration of custom-built small-sized cars, a custom-built quadcopter, and a commercial Vertical Take-Off and Landing (VTOL) aircraft. To validate the prototype and the vehicles’ remote control, we created several services accessible via a web browser and controlled through a computer keyboard. We tested the solution in a local network, remote networks and mobile networks (i.e., 3G and Long-Term Evolution (LTE)) and proved the benefits of decentralizing the communications into multiple point-to-point links for the remote control. Consequently, the solution can provide scalable UV-based services, with low technical effort, for anyone at anytime and anywhere.

scholarly journals Probability waves: pattern-based p-value correction in mass univariate analysis between two event-related potential waves

2019 ◽  
Author(s):  
Dimitri Marques Abramov
Keyword(s):  
Type I Error ◽  
Univariate Analysis ◽  
Event Related Potential ◽  
New Method ◽  
Multiple Point ◽  
P Value ◽  
Type I ◽  
P Values ◽  
Two Samples ◽  
Point To Point

AbstractBackgroundMethods for p-value correction are criticized for either increasing Type II error or improperly reducing Type I error. This problem is worse when dealing with hundreds or thousands of paired comparisons between waves or images which are performed point-to-point. This text considers patterns in probability vectors resulting from multiple point-to-point comparisons between two ERP waves (mass univariate analysis) to correct p-values. These patterns (probability waves) mirror ERP waveshapes and might be indicators of consistency in statistical differences.New methodIn order to compute and analyze these patterns, we convoluted the decimal logarithm of the probability vector (p’) using a Gaussian vector with size compatible to the ERP periods observed. For verify consistency of this method, we also calculated mean amplitudes of late ERPs from Pz (P300 wave) and O1 electrodes in two samples, respectively of typical and ADHD subjects.Resultsthe present method reduces the range of p’-values that did not show covariance with neighbors (that is, that are likely random differences, type I errors), while preserving the amplitude of probability waves, in accordance to difference between respective mean amplitudes.Comparison with existing methodsthe positive-FDR resulted in a different profile of corrected p-values, which is not consistent with expected results or differences between mean amplitudes of the analyzed ERPs.Conclusionthe present new method seems to be biological and statistically more suitable to correct p-values in mass univariate analysis of ERP waves.

scholarly journals MEDIA ENGINEERING WITH A CONTENT HUB SYSTEM. GENERIC CONTENT TRANSFORMATION FOR MOBILE MEDIA

2014 ◽  
pp. 108-115
Author(s):  
Michael A. Herzog ◽  
Matthias Trier
Keyword(s):  
Multiple Point ◽  
Unified Approach ◽  
Mobile Media ◽  
Authoring Environment ◽  
Point To Point ◽  
High Level ◽  
Media Channels ◽  
Different Content ◽  
Transformation Processes ◽  
Primary Problem

A primary problem in multimedia content production is the plethora of formats and the resulting multiple point-to-point transformation processes in different content formatting specifications. However, these content transformation processes can be conceptually broken down into a limited set of abstract principles. This allows a unified approach that theoretically enables the transformation of any given input channel into any desired output. Based on this principle, the present article introduces the concept of Generic Content Transformation and the related project MOCCA, which develops the corresponding software implementation of generic content transformation for a variety of input and output channels. To balance technical similarities with specific properties of different media channels, we suggest a combination of an XML-based structure (MocML) and a high level authoring environment. Generic Content Transformation further allows for novel means of accessing assets via compound search algorithms. In the second part we summarize and discuss current results and experiences in three scenarios of media production, including mobile media.

New communication strategies in NEMO

2021 ◽  
Author(s):  
Italo Epicoco ◽  
Silvia Mocavero ◽  
Francesca Mele ◽  
Alessandro D'Anca ◽  
Giovanni Aloisio
Keyword(s):  
Domain Size ◽  
Data Locality ◽  
Communication Strategy ◽  
Multiple Point ◽  
Design Strategies ◽  
Computational Point ◽  
Communication Time ◽  
Collective Communications ◽  
Point To Point ◽  
Point Stencil

<p>One of the main bottlenecks for NEMO scalability is the time spent performing communications. Two complementary strategies are here proposed to reduce the communication frequency and the communication time: the MPI3 neighbourhood collective communications instead of multiple point to point exchanges and the increasing of the halo region size.</p><p>NEMO performs Lateral Boundaries Conditions update by using four point to point MPI communications at north, south, east and west for each MPI domain. The model completes east-west exchange before performing north-south communications. The order of the exchanges allows us to preserve both 5-point and 9-point stencils. MPI3 neighbourhood collectives provide a way to have sub-communicators used to perform collective communications. Two different sub-communicators can be defined in order to support the two different stencils. A single MPI message is needed to be built for all neighbours instead of 4 different messages before calling the collective communication, while the received message is used to update the halo region, following the order of the neighbours in the sub-communicator.</p><p>The new communication strategy has been tested on two computational kernels (i.e. one for 5-point stencil and one for 9-point stencil), selected among the main relevant routines from the computational point of view. Preliminary tests, performed on a domain size of 3000x2000x31 grid points on the Zeus Intel Xeon Gold 6154 machine, available at CMCC, show a gain in communication time for the 5-point stencil use case up to 31% on 2016 cores. The improvement is reduced when communications with processes on the diagonal are activated. However, a modest gain is still achieved, depending on the number of cores.</p><p>On the other side, the analysis of some NEMO routines shows how the exchange of more than one row/column of halo would allow to move communications outside the routine, preserving data dependencies. A wider halo size reduces the frequency of message exchanges whilst increases the message size at each exchange. It allows us to adopt some optimisation strategies (i.e. loop fusion, tiling, etc.) to improve the data locality. Nevertheless, the use of a wider halo introduces itself some improvements for some kernels like for the MUSCL advection scheme which shows a gain of ~23% in the execution time comparing the original version and the new one with halo extended to 2 lines and the communication moved outside the computing region.</p><p>The current work has been performed according to the NEMO development strategy plan, defined by the NEMO Consortium, which establish the priorities of the design strategies to reduce the bottlenecks to the scalability and the time to solution.</p><p> </p><p>Acknowledgments</p><p>This work is co-funded by the EU H2020 IS-ENES project Phase 3 (ISENES3) under Grant Agreement number 824084.</p>

Finding the Right Problems: Some HREM Applications to Interfaces

1984 ◽  
Vol 42 ◽  
pp. 376-379
Author(s):  
D. Cherns
Keyword(s):  
Grain Boundaries ◽  
High Resolution Electron Microscopy ◽  
Boundary Structure ◽  
Atomic Structures ◽  
Grain Boundary Structure ◽  
Resolution Electron ◽  
Point To Point ◽  
The Right ◽  
New Generation ◽  
Better Than

The use of high resolution electron microscopy (HREM) to determine the atomic structure of grain boundaries and interfaces is a topic of great current interest. Grain boundary structure has been considered for many years as central to an understanding of the mechanical and transport properties of materials. Some more recent attention has focussed on the atomic structures of metalsemiconductor interfaces which are believed to control electrical properties of contacts. The atomic structures of interfaces in semiconductor or metal multilayers is an area of growing interest for understanding the unusual electrical or mechanical properties which these new materials possess. However, although the point-to-point resolutions of currently available HREMs, ∼2-3Å, appear sufficient to solve many of these problems, few atomic models of grain boundaries and interfaces have been derived. Moreover, with a new generation of 300-400kV instruments promising resolutions in the 1.6-2.0 Å range, and resolutions better than 1.5Å expected from specialist instruments, it is an appropriate time to consider the usefulness of HREM for interface studies.

An x-ray microprobe based upon a close-coupled focal-spot / glass capillary arrangement

1992 ◽  
Vol 50 (2) ◽  
pp. 1758-1759
Author(s):  
D. A. Carpenter ◽  
M. A. Taylor
Keyword(s):  
Imaging Techniques ◽  
Fluorescence Analysis ◽  
High Sensitivity ◽  
Specimen Preparation ◽  
X Rays ◽  
Glass Capillary ◽  
Close Coupling ◽  
X Ray ◽  
Point To Point ◽  
Beam Damage

The development of intense sources of x rays has led to renewed interest in the use of microbeams of x rays in x-ray fluorescence analysis. Sparks pointed out that the use of x rays as a probe offered the advantages of high sensitivity, low detection limits, low beam damage, and large penetration depths with minimal specimen preparation or perturbation. In addition, the option of air operation provided special advantages for examination of hydrated systems or for nondestructive microanalysis of large specimens.The disadvantages of synchrotron sources prompted the development of laboratory-based instrumentation with various schemes to maximize the beam flux while maintaining small point-to-point resolution. Nichols and Ryon developed a microprobe using a rotating anode source and a modified microdiffractometer. Cross and Wherry showed that by close-coupling the x-ray source, specimen, and detector, good intensities could be obtained for beam sizes between 30 and 100μm. More importantly, both groups combined specimen scanning with modern imaging techniques for rapid element mapping.

Sign in / Sign up

Export Citation Format

Share Document