scholarly journals A Global Robotic Telescope Network for Time-Domain Science

2011 ◽  
Vol 7 (S285) ◽  
pp. 408-410 ◽  
Author(s):  
R. A. Street ◽  
T. A. Lister ◽  
Y. Tsapras ◽  
A. Shporer ◽  
F. B. Bianco ◽  
...  
Keyword(s):  
Network Design ◽  
Time Domain ◽  
General Purpose ◽  
Technical Failure ◽  
Network Approach ◽  
Robotic Telescope ◽  
Astronomical Facility

AbstractLas Cumbres Observatory Global Telescope Network (LCOGT) is currently building a new kind of general-purpose astronomical facility: a fully robotic network of telescopes of 2m, 1m and 0.4m apertures and homogeneous instrumentation. A pan-network approach to scheduling (rather than per individual telescope) offers redundancy in the event of poor weather or technical failure, as well as the ability to observe a target around the clock. Here we describe the network design and instrumentation under development, together with the main science programmes already being lead by LCOGT staff.

scholarly journals Modelling and Simulation of Tramway Transportation Systems

2019 ◽  
Vol 2019 ◽  
pp. 1-8 ◽  
Author(s):  
A. Capasso ◽  
M. Ceraolo ◽  
R. Lamedica ◽  
G. Lutzemberger ◽  
A. Ruvio
Keyword(s):  
Time Domain ◽  
Energy Recovery ◽  
Simulation Models ◽  
Transportation Systems ◽  
General Purpose ◽  
Storage Device ◽  
Time Domain Simulation ◽  
Real Cost ◽  
Braking Energy Recovery ◽  
Track Analysis

Electrified guided vehicles typically face routes having a large number of acceleration and braking phases. The braking energy, since the feeding line presents nonreversible electrical feeding substations, can be recovered in the presence of other nearby vehicles. To improve braking energy recovery, one or more storage systems can be positioned along the track. Analysis of effectiveness for the considered solution requires time-domain simulation models, to be created through suitable simulation general-purpose languages or specialised languages/software. In this paper, three different tools for the considered existing tramway were developed, and the main examined characteristics have been compared to each other. Then, analysis of output results was also performed, demonstrating the real cost-effectiveness of introducing one storage device on the considered tramline in operation.

scholarly journals Multi Simulation Platform for Time Domain Diffuse Optical Tomography: An Application to a Compact Hand-Held Reflectance Probe

2019 ◽  
Vol 9 (14) ◽  
pp. 2849 ◽  
Author(s):  
Edoardo Ferocino ◽  
Antonio Pifferi ◽  
Simon Arridge ◽  
Fabrizio Martelli ◽  
Paola Taroni ◽  
...  
Keyword(s):  
Time Domain ◽  
Count Rate ◽  
Breast Imaging ◽  
Optical Tomography ◽  
Diffuse Optical Tomography ◽  
Cost Effective ◽  
General Purpose ◽  
Simulation Platform ◽  
Photon Count ◽  
Optical Properties Of Tissue

Time Domain Diffuse Optical Tomography (TD-DOT) enables a full 3D reconstruction of the optical properties of tissue, and could be used for non-invasive and cost-effective in-depth body exploration (e.g., thyroid and breast imaging). Performance quantification is crucial for comparing results coming from different implementations of this technique. A general-purpose simulation platform for TD-DOT clinical systems was developed with a focus on performance assessment through meaningful figures of merit. The platform was employed for assessing the feasibility and characterizing a compact hand-held probe for breast imaging and characterization in reflectance geometry. Important parameters such as hardware gating of the detector, photon count rate and inclusion position were investigated. Results indicate a reduced error (<10%) on the absorption coefficient quantification of a simulated inclusion up to 2-cm depth if a photon count rate ≥ 106 counts per second is used along with a good localization (error < 1 mm down to 25 mm-depth).

A Parallel Hardware Architecture based on Node-Depth Encoding to Solve Network Design Problems

2014 ◽  
Vol 4 (1) ◽  
pp. 54-75
Author(s):  
Marcilyanne M. Gois ◽  
Paulo Matias ◽  
André B. Perina ◽  
Vanderlei Bonato ◽  
Alexandre C. B. Delbem
Keyword(s):  
Network Design ◽  
Phylogenetic Trees ◽  
General Purpose ◽  
Hardware Architecture ◽  
Design Problems ◽  
Power Circuit ◽  
General Purpose Processor ◽  
Network Design Problems ◽  
Input Variables ◽  
Node Depth

Many problems involving network design can be found in the real world, such as electric power circuit planning, telecommunications and phylogenetic trees. In general, solutions for these problems are modeled as forests represented by a graph manipulating thousands or millions of input variables, making it hard to obtain the solutions in a reasonable time. To overcome this restriction, Evolutionary Algorithms (EAs) with dynamic data structures (encodings) have been widely investigated to increase the performance of EAs for Network Design Problems (NDPs). In this context, this paper proposes a parallelization of the node-depth encoding (NDE), a data structure especially designed for NDPs. Based on the NDE the authors have developed a parallel algorithm and a hardware architecture implemented on FPGA (Field-Programmable Gate Array), denominated Hardware Parallelized NDE (HP-NDE). The running times obtained in a general purpose processor (GPP) and the HP-NDE are compared. The results show a significant speedup in relation to the GPP solution, solving NDP in a time limited by a constant. Such time upper bound can be satisfied for any size of network until the hardware resources available on the FPGA are depleted. The authors evaluated the HP-NDE on a Stratix IV FPGA with networks containing up to 2048 nodes.

Transient Analysis of Multi-Conductor Transmission Line Based on the Second-Order Upwind Scheme

2014 ◽  
Vol 543-547 ◽  
pp. 821-824
Author(s):  
Yin Han Gao ◽  
Jun Dong Zhang ◽  
Kai Yu Yang ◽  
Tian Hao Wang ◽  
Yu Zhu ◽  
...  
Keyword(s):  
Transmission Line ◽  
Time Domain ◽  
Splitting Method ◽  
General Purpose ◽  
Second Order ◽  
Upwind Scheme ◽  
Application Process ◽  
Discontinuous Solutions ◽  
Leapfrog Scheme ◽  
Line Coupling

On the basis of the second-order upwind scheme, combined with the flux splitting method, we derive a uniform multi-conductor transmission line time-domain calculations. This method is a direct time-domain discrete numerical method with second order accuracy. It does not have any special requirements for circuit and the application process and complex transformations which lead to facilitate the preparation of the program. Numerical experiments show that this method of preparation of general purpose computing program has roughly the same computational efficiency with the traditional leapfrog scheme and at the discontinuous solutions, there are no non-physical oscillations. It can easily be used to calculate a uniform multi-conductor transmission line coupling.

scholarly journals THE 4 M NEW ROBOTIC TELESCOPE PROJECT: AN UPDATED REPORT

2021 ◽  
Vol 53 ◽  
pp. 8-13
Author(s):  
C. M. Gutiérrez ◽  
M. Torres ◽  
A. Oria ◽  
J. J. Fernández-Valdivia ◽  
D. Arnold ◽  
...  
Keyword(s):  
Control System ◽  
Time Domain ◽  
Near Infrared ◽  
Quick Response ◽  
Atmospheric Conditions ◽  
Scientific Impact ◽  
The Status ◽  
Robotic Telescope ◽  
Technical Solutions ◽  
And Control

The New Robotic Telescope (NRT) is an international collaboration to build and operate a 4m diameter fully robotic telescope. The telescope will take advantage of the superb atmospheric conditions at the Observatory of the Roque de los Muchachos (ORM). In conjunction with a large aperture, entirely robotic operation, quick response, and a set of versatile instrumentation in the optical and near-infrared this guarantees a high scientific impact focused mainly in the area of time domain astronomy. This paper presents the scientific motivation and the status of the project, discussing possible technical solutions under evaluation for the optics, mechanics and control system.

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