scholarly journals THE CBE HARDWARE ACCELERATOR FOR NUMERICAL RELATIVITY: A SIMPLE APPROACH

2010 ◽  
Vol 01 (01) ◽  
pp. 147-156 ◽  
Author(s):  
GAURAV KHANNA
Keyword(s):  
Programming Model ◽  
Numerical Relativity ◽  
Low Cost ◽  
Kerr Black Hole ◽  
Cell Processor ◽  
Science Community ◽  
Advanced Knowledge ◽  
Overall Performance ◽  
Software Caching ◽  
Performance Results

Hardware accelerators (such as the Cell Broadband Engine) have recently received a significant amount of attention from the computational science community because they can provide significant gains in the overall performance of many numerical simulations at a low cost. However, such accelerators usually employ a rather unfamiliar and specialized programming model that often requires advanced knowledge of their hardware design. In this article, we demonstrate an alternate and simpler approach toward managing the main complexities in the programming of the cell processor, called software caching. We apply this technique to a numerical relativity (NR) application: a time-domain, finite-difference Kerr black hole perturbation evolver, and present the performance results. We obtain gains in the overall performance of generic simulations that are close to the theoretical maximum that can be obtained through our parallelization approach.

scholarly journals Biomechanics of Trail Running Performance: Quantification of Spatio-Temporal Parameters by Using Low Cost Sensors in Ecological Conditions

2021 ◽  
Vol 11 (5) ◽  
pp. 2093
Author(s):  
Noé Perrotin ◽  
Nicolas Gardan ◽  
Arnaud Lesprillier ◽  
Clément Le Goff ◽  
Jean-Marc Seigneur ◽  
...  
Keyword(s):  
Heart Rate ◽  
Low Cost ◽  
Step Length ◽  
Measurement Unit ◽  
Ecological Conditions ◽  
Sports Science ◽  
Ground Contact Time ◽  
Spatio Temporal ◽  
Performance Results ◽  
Trail Running

The recent popularity of trail running and the use of portable sensors capable of measuring many performance results have led to the growth of new fields in sports science experimentation. Trail running is a challenging sport; it usually involves running uphill, which is physically demanding and therefore requires adaptation to the running style. The main objectives of this study were initially to use three “low-cost” sensors. These low-cost sensors can be acquired by most sports practitioners or trainers. In the second step, measurements were taken in ecological conditions orderly to expose the runners to a real trail course. Furthermore, to combine the collected data to analyze the most efficient running techniques according to the typology of the terrain were taken, as well on the whole trail circuit of less than 10km. The three sensors used were (i) a Stryd sensor (Stryd Inc. Boulder CO, USA) based on an inertial measurement unit (IMU), 6 axes (3-axis gyroscope, 3-axis accelerometer) fixed on the top of the runner’s shoe, (ii) a Global Positioning System (GPS) watch and (iii) a heart belt. Twenty-eight trail runners (25 men, 3 women: average age 36 ± 8 years; height: 175.4 ± 7.2 cm; weight: 68.7 ± 8.7 kg) of different levels completed in a single race over a 8.5 km course with 490 m of positive elevation gain. This was performed with different types of terrain uphill (UH), downhill (DH), and road sections (R) at their competitive race pace. On these sections of the course, cadence (SF), step length (SL), ground contact time (GCT), flight time (FT), vertical oscillation (VO), leg stiffness (Kleg), and power (P) were measured with the Stryd. Heart rate, speed, ascent, and descent speed were measured by the heart rate belt and the GPS watch. This study showed that on a ≤10 km trail course the criteria for obtaining a better time on the loop, determined in the test, was consistency in the effort. In a high percentage of climbs (>30%), two running techniques stand out: (i) maintaining a high SF and a short SL and (ii) decreasing the SF but increasing the SL. In addition, it has been shown that in steep (>28%) and technical descents, the average SF of the runners was higher. This happened when their SL was shorter in lower steep and technically challenging descents.

Processing Panorama Video in Real-time

2014 ◽  
Vol 08 (02) ◽  
pp. 209-227 ◽  
Author(s):  
Håkon Kvale Stensland ◽  
Vamsidhar Reddy Gaddam ◽  
Marius Tennøe ◽  
Espen Helgedagsrud ◽  
Mikkel Næss ◽  
...  
Keyword(s):  
Real Time ◽  
Graphics Processing Units ◽  
Low Cost ◽  
Video Camera ◽  
Wide Field ◽  
High Data ◽  
Data Rates ◽  
Camera Arrays ◽  
Analysis System ◽  
Performance Results

There are many scenarios where high resolution, wide field of view video is useful. Such panorama video may be generated using camera arrays where the feeds from multiple cameras pointing at different parts of the captured area are stitched together. However, processing the different steps of a panorama video pipeline in real-time is challenging due to the high data rates and the stringent timeliness requirements. In our research, we use panorama video in a sport analysis system called Bagadus. This system is deployed at Alfheim stadium in Tromsø, and due to live usage, the video events must be generated in real-time. In this paper, we describe our real-time panorama system built using a low-cost CCD HD video camera array. We describe how we have implemented different components and evaluated alternatives. The performance results from experiments ran on commodity hardware with and without co-processors like graphics processing units (GPUs) show that the entire pipeline is able to run in real-time.

scholarly journals Miniaturized Broadband-Multiband Planar Monopole Antenna in Autonomous Vehicles Communication System Device

Electronics ◽  
2021 ◽  
Vol 10 (21) ◽  
pp. 2715
Author(s):  
Ming-An Chung ◽  
Chih-Wei Yang
Keyword(s):  
Communication System ◽  
Autonomous Vehicles ◽  
Low Cost ◽  
Antenna Design ◽  
Dual Band ◽  
Impedance Change ◽  
Antenna Structure ◽  
Low Profile ◽  
Performance Results ◽  
Wireless Standards

The article mainly presents that a simple antenna structure with only two branches can provide the characteristics of dual-band and wide bandwidths. The recommended antenna design is composed of a clockwise spiral shape, and the design has a gradual impedance change. Thus, this antenna is ideal for applications also recommended in these wireless standards, including 5G, B5G, 4G, V2X, ISM band of WLAN, Bluetooth, WiFI 6 band, WiMAX, and Sirius/XM Radio for in-vehicle infotainment systems. The proposed antenna with a dimension of 10 × 5 mm is simple and easy to make and has a lot of copy production. The operating frequency is covered with a dual-band from 2000 to 2742 MHz and from 4062 to beyond 8000 MHz and, it is also demonstrated that the measured performance results of return loss, radiation, and gain are in good agreement with simulations. The radiation efficiency can reach 91% and 93% at the lower and higher bands. Moreover, the antenna gain can achieve 2.7 and 6.75 dBi at the lower and higher bands, respectively. This antenna design has a low profile, low cost, and small size features that may be implemented in autonomous vehicles and mobile IoT communication system devices.

Performance measurement and management for manufacturing SMEs: a financial statement-based system

2017 ◽  
Vol 21 (1) ◽  
pp. 17-36 ◽  
Author(s):  
Moujib Bahri ◽  
Josée St-Pierre ◽  
Ouafa Sakka
Keyword(s):  
Performance Measurement ◽  
Low Cost ◽  
Secondary Data ◽  
Specific Area ◽  
Financial Statements ◽  
Financial Statement ◽  
Business Practices ◽  
Content Type ◽  
Overall Performance ◽  
Probabilistic Sample

Purpose The purpose of this paper is to propose a performance measurement and management system (PMMS) for small- and medium-sized enterprises (SMEs) based on an analysis of the connections between the firm’s business practices and financial results as reported in the financial statements. Design/methodology/approach Secondary data on the business practices and financial statements of 108 Canadian manufacturing SMEs were taken from a private database. Items from financial statements were used to measure the firm’s performance in specific areas such as sales and current assets management, while net profit was used to measure the overall performance. Information about the level of adoption of more than 120 business practices by the sampled firms was also used. Step-wise regression was then performed for two consecutive years to identify the business practices that had significantly influenced the items in the financial statements. Findings The findings show that an understanding of the business practice/financial statement connection can be useful in managing SME performance. The regression analyses provide rich and interesting results. They indicate that some practices influence performance quickly, while others have a deferred effect. In addition, some practices have impacts that are significant in specific areas of the organization but insignificant in terms of overall performance, while others affect the firm’s overall performance but not the specific area they are intended to improve. Research limitations/implications The main limitation of the study is the non-probabilistic sample. However, the sampled SMEs vary widely in their characteristics, which should partially mitigate the negative impacts of a non-probabilistic sample. Practical implications The paper offers a useful and low-cost PMMS for SMEs, using information that is easily available to owner-managers. It shows that SME performance can be managed using a simple system built around the firm’s financial statements. Originality/value The study is one of the first to empirically test the connection between an extensive list of SME business practices and the financial results presented in the firms’ financial statements.

Strength Properties and Microscopic Observations of Concrete with Plastic Wastes as Partial Aggregate Substitute

2018 ◽  
Author(s):  
Andres Winston C. Oreta ◽  
Maejann E. Cuartero ◽  
Nikko Paolo P. Villanueva
Keyword(s):  
Low Cost ◽  
Construction Materials ◽  
Strength Properties ◽  
The Philippines ◽  
Sustainable Construction ◽  
Strength Performance ◽  
Plastic Bags ◽  
Plastic Wastes ◽  
Metro Manila ◽  
Performance Results

<p>Sustainable construction can be promoted by producing construction materials with recycled waste. This study aims to address the issue of recycling plastic wastes and providing a means of livelihood in a relocation site of typhoon victims and urban settlers in Metro Manila by exploring the production of quality concrete hollow blocks (CHB) mixed with waste plastic wastes. In the study, the strength properties of concrete with various types of plastic wastes (PW) such as plastic bags (PB) and noodle wrappers (NW) as substitute to fine aggregates were investigated. Different percent substitutions, specifically 2.5%, 5%, 7.5% and 10%, were considered for each mix. The behaviour and strength properties of the concrete with and without PW were analysed and compared Moreover, the microscopic structures of the various types of mixes were observed using a Scanning Electron Microscopy (SEM) and related to the failure mode and strength performance. Results show that concrete with PB outperformed the other concrete mixes with plastics due to the plastic bag’s high stretchable property, compared to the noodle wrappers. In addition, plastics, in general, provide additional ductility to the concrete enabling them to tolerate more deformation at lower loads. The final product of the study is a mix design for producing non-load bearing concrete hollow blocks (CHB) that can be used for low-cost housing in the Philippines.</p>

Mobile Health (M-Health) for Tele-Wound Monitoring

2019 ◽  
pp. 98-116 ◽  
Author(s):  
Chinmay Chakraborty
Keyword(s):  
Mobile Health ◽  
Patient Information ◽  
Chronic Wound ◽  
Low Cost ◽  
System Model ◽  
Monitoring And Diagnosis ◽  
Cloud Database ◽  
Overall Performance ◽  
Urban People

This chapter describes the implementation of tele-wound monitoring (TWM) for a patient's chronic wound using a smartphone. The system proved to be quick and reliable for providing healthcare at the doorstep. The smartphone-enabled a tele-wound monitoring (TWM) framework, which is used for remote wound monitoring, has been highlighted. The TWM is effective for both rural as well as urban people; it provides good performance in terms of wound monitoring and diagnosis. The objective of this chapter is to design and develop a TWM system model that can acquire, process and monitor chronic wound-related problems by using a low-cost smartphone to increase the overall performance of the system. Specifically, the TWM system is developed for biomedical information like chronic wound processing to monitor important patient information inexpensively and accurately. The implementation is carried out using hypertext preprocessor (PHP) and MySql database and especially by Firebase cloud database, which is used for improving the efficiency.

Mobile Telemedicine Systems for Remote Patient's Chronic Wound Monitoring

2020 ◽  
pp. 977-1003
Author(s):  
Chinmay Chakraborty ◽  
Bharat Gupta ◽  
Soumya K. Ghosh
Keyword(s):  
Health Care ◽  
Patient Information ◽  
Delivery Of Health Care ◽  
Medical Information ◽  
Chronic Wound ◽  
Low Cost ◽  
System Model ◽  
Telemedicine System ◽  
Overall Performance ◽  
Urban People

Telemedicine can be defined as the delivery of health care and sharing of medical information at a distance using telecommunication platforms. This chapter describes the implementation of a mobile telemedicine system for patient's chronic wound (CW) monitoring using a smartphone. The system proved to be quick and reliable for providing health care at door step. The tele-wound technology network (TWTN) framework in telemedicine systems using smartphones for remote wound monitoring has been proposed. This framework is effective for both rural as well as urban people; it gives good performance in terms of wound monitoring and advanced diagnosis. The main objective of this work is to design and develop a TWTN system model that can acquire, process and monitor CW related problems with using a low cost smartphone to increase the overall performance of the system. Specifically, the TWTN system is developed for biomedical information like CW processing to monitor important patient information inexpensively and accurately.

scholarly journals A SCALABLE DISTRIBUTED MULTIMEDIA KNOWLEDGE RETRIEVAL SYSTEM ON A CLUSTER OF HETEROGENEOUS HIGH PERFORMANCE ARCHITECTURES

2000 ◽  
Vol 09 (03) ◽  
pp. 343-367
Author(s):  
STEPHEN W. RYAN ◽  
ARVIND K. BANSAL
Keyword(s):  
Logic Programming ◽  
Message Passing ◽  
High Performance ◽  
Programming Model ◽  
Object Oriented Programming ◽  
Remote Access ◽  
The Internet ◽  
Data Parallel ◽  
Heterogeneous Architectures ◽  
Performance Results

This paper describes a system to distribute and retrieve multimedia knowledge on a cluster of heterogeneous high performance architectures distributed over the Internet. The knowledge is represented using facts and rules in an associative logic-programming model. Associative computation facilitates distribution of facts and rules, and exploits coarse grain data parallel computation. Associative logic programming uses a flat data model that can be easily mapped onto heterogeneous architectures. The paper describes an abstract instruction set for the distributed version of the associative logic programming and the corresponding implementation. The implementation uses a message-passing library for architecture independence within a cluster, uses object oriented programming for modularity and portability, and uses Java as a front-end interface to provide a graphical user interface and multimedia capability and remote access via the Internet. The performance results on a cluster of IBM RS 6000 workstations are presented. The results show that distribution of data improves the performance almost linearly for small number of processors in a cluster.

CFD Investigation of the Multiple Rotors Darrieus Type Turbine Performance

2019 ◽  
Author(s):  
Omar Sherif Mohamed ◽  
Ahmed Ibrahim ◽  
Ahmed M. R. El Baz
Keyword(s):  
Urban Areas ◽  
Low Cost ◽  
Vertical Axis ◽  
Power Coefficient ◽  
Vertical Axis Wind Turbine ◽  
Cfd Simulations ◽  
Close Proximity ◽  
Horizontal Axis Wind Turbines ◽  
Computational Fluid Dynamics Cfd ◽  
Overall Performance

Abstract The last few years have witnessed researches concerned by vertical axis wind turbine (VAWT) performance considering its advantages compared to the horizontal axis wind turbines, as it can be operated in urban areas without producing noise, ease of maintenance and simple construction, in addition to its low cost. More interest is growing in developing efficient clusters of VAWT in order to increase power generation at specific sites by using multiple turbines. In the present work, the performance of various configurations of Darrieus type VAWT clusters is examined using computational fluid dynamics (CFD) simulations. The objective of this work is to increase the overall power coefficient of the turbines cluster compared to single rotor performance. This objective shall be achieved by examining mutual interactions between rotors arranged in close proximity and examining the effect of oblique angle between rotors on overall performance of the cluster of rotors. The performance is assessed by observing the overall power coefficient of the cluster. Also, the velocity wake of the simulated three rotors turbine cases was analyzed and compared to the that of the single rotor.

scholarly journals Numerical Thermal Analysis and 2-D CFD Evaluation Model for An Ideal Cryogenic Regenerator

Micromachines ◽  
2020 ◽  
Vol 11 (4) ◽  
pp. 361 ◽  
Author(s):  
Natheer Almtireen ◽  
Jürgen J. Brandner ◽  
Jan G. Korvink
Keyword(s):  
High Reliability ◽  
Low Cost ◽  
Evaluation Model ◽  
Volumetric Flow Rate ◽  
Cooling Capacity ◽  
Heating And Cooling ◽  
The Matrix ◽  
Overall Performance ◽  
Application Requirements ◽  
Vital Element

Regenerative cryocoolers such as Stirling, Gifford–McMahon, and pulse tube cryocoolers possess great merits such as small size, low cost, high reliability, and good cooling capacity. These merits led them to meet many IR and superconducting based application requirements. The regenerator is a vital element in these closed-cycle cryocoolers, but the overall performance depends strongly on the effectiveness of the regenerator. This paper presents a one-dimensional numerical analysis for the idealized thermal equations of the matrix and the working gas inside the regenerator. The algorithm predicts the temperature profiles for the gas during the heating and cooling periods, along with the matrix nodal temperatures. It examines the effect of the regenerator’s length and diameter, the matrix’s geometric parameters, the number of heat transfer units, and the volumetric flow rate, on the performance of an ideal regenerator. This paper proposes a 2D axisymmetric CFD model to evaluate the ideal regenerator model and to validate its findings.

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