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A Comparison of Request Distribution Strategies Used in One and Two Layer architectures of Web Cloud systems 26th

A Comparison of Request Distribution Strategies Used in One ...

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26th international conference on computer Networks (CN)

作者： Zatwarnicki, Krzysztof Zatwarnicka, Anna Opole Univ Technol Inst Comp Sci 76 Proszkowska St PL-45758 Opole Poland

ISBN: (纸本)9783030219529;9783030219512

Web Cloud systems are becoming more and more popular. In the article we want to examine HTTP request distribution strategies that can be used in one and two layer architectures of Web cloud systems. In particular, we want to compare our intelligent solutions with each other, and with popular and most commonly used in Web cloud systems. We describe modern solutions, present the test-bed and results of conducted experiments. At the end, we discuss results and present final conclusions.

关键词： Web cloud HTTP request distribution Cloud computing Fuzzy-Neural modeling Web systems simulation

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Urban light electric vehicle real-time model architecture using VeriStand Software

Urban light electric vehicle real-time model architecture us...

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international (EPE-PEMC) Power Electronics and Motion Control conference

作者： Raul Nemeş Sorina Ciornei Mircea Ruba Claudia Marţiş Horia Hedeşiu Technical University of Cluj Napoca Cluj Napoca Romania

ISBN: (纸本)9781728156606;9781728156613

The approach of the paper regards analysis of a light electric vehicle used for urban mobility via real-time simulation with experimental validation. Using a dedicated software, National Instruments VeriStand, the authors prove the possibility of performing vehicle testing for a period of actual mobility time recorded inside the urban scenario. Such long-time simulations are extremely time consuming or impossible to perform using computer-based simulators. One solution is to decrease the model complexity in order to perform these simulations, however the computation time still reaches periods beyond the actual analyzed one. Using VeriStand, the model complexity is kept at its maximum, hence the accuracy and the performances are not diminished. The required computation time is the actual mobility time. Hence, the same time can be applied for an actual test-bench, proving via comparative analysis the quality of the results and the accuracy of the model under test. The considered application is an electric scooter, equipped with a 300W permanent magnet synchronous machine (PMSM), supplied via an inverter from a source of 36 VDC. The model of the PMSM is a flux-linkage one designed in Matlab Simulink and exported into VeriStand running on a NI-PXIe 8135 embedded Controller. The entire study is validated with experimental measurements performed with the actual machine under study.

关键词： Analytical models Software packages Computational modeling Electric vehicles Real-time systems Complexity theory Mathematical model

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modeling and performances assessments of PV/T bifluid hybrid collector: Three cooling modes operation case 4

Modeling and performances assessments of PV/T bifluid hybrid...

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4th international conference on Electrical and Information Technologies, ICEIT 2020

作者： El Manssouri, Oussama El Fouas, Chaimae Hajji, Bekkay Rabhi, Abdelhamid Tina, Giuseppe Marco Gagliano, Antonio Mohamed First University Renewable Energy Embedded System and Data Processing Laboratory National School of Applied Sciences Oujda Morocco Picardie Jules Verne University Modelization Information and Systems Laboratory Amiens France University of Catania DIEEI: Department of Electric Electronic and Computer Engineering Catania Italy

ISBN: (数字)9781728143415

ISBN: (纸本)9781728143415

The objective of the present work is the performance assessments of a bi-fluid photovoltaic/thermal solar collector (PV/T). Based on energy-balance equations, a mathematical model of PV/T hybrid collector has been developed and simulated using Matlab Software. This model takes into account the effect of the three modes of fluid operation under the same PV/T system, namely: the air mode, the water mode, and the simultaneous mode of water and air. The results show that the lowest PV module temperature is observed in the simultaneous mode (air water) compared to others modes. It's maximum value achieved is around 62°C in the bi-fluid mode against 80°C and 73°C respectively in the air mode and the water mode. The maximum efficiencies of 66.97 % (thermal efficiency) and 10.1% (electrical efficiency) are also observed, when both fluids are operated simultaneously compared to others modes. Finally, the working in simultaneous mode is beneficial to transmit more heat, produce more thermal energy and consequently improve the electrical and thermal performances of the PV/T hybrid collector. Moreover, the theoretical model developed is validated, evidencing a good fit between simulation results and the experimental data available in literature. The PV/T collector designed in this study has a variety of applications, as solar drying in agriculture, air conditioning, space heating and hot water supply for domestic applications. © 2020 IEEE.

关键词： Air

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WISDOM: Watering Intelligently at Scale with Distributed Optimization and modeling 19

WISDOM: Watering Intelligently at Scale with Distributed Opt...

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17th ACM conference on embedded Networked Sensor systems (SenSys)

作者： Winkler, Daniel A. Cerpa, Alberto E. Univ Calif Merced CA 95343 USA

ISBN: (纸本)9781450369503

As lawn irrigation is estimated to consume 7 billion gallons of scarce fresh water each day in North America alone, lawn irrigation systems are a high priority for improvements in efficiency. To this end, recent work has introduced several key advancements in irrigation control. Distributed actuation systems allow the irrigation system to apply water completely independently across the field allowing flexibility of control, and the use of fluid flow modeling and optimization allows more efficient schedules to be computed automatically, significantly improving the irrigation quality of service as well. However, the proposed systems are designed with centralized architectures that introduce single points of failure, computational bottlenecks in data processing, and significant network energy for data forwarding used by the centralized data-driven modeling strategies. In response to these challenges, we propose and demonstrate WISDOM, whose novel and flexible hardware and processing pipelines enable the use of a distributed system for the management of irrigation systems of any scale, with energy independence by way of energy harvesting. Across 4 weeks of live system deployment, we find that the WISDOM system can save up to 32.9% of water in comparison to industry-best, while maintaining a perfect quality of service to the plant. Furthermore, with substantial analysis in simulation we find that in addition to practical system improvements, the use of the proposed distributed system within typical operating conditions will provide all of the efficiency and quality-of-service benefits of the globally-modeled, centrally controlled systems, while allowing the robust control of irrigation systems of any size.

关键词： Quality of service

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Integrating Modalities into Context Aware eLearning System Using Cloud Computing

Integrating Modalities into Context Aware eLearning System U...

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Women in Data Science at Taif University (WiDSTaif ), international conference of

作者： Atef Zaguia Darine Ameyed Yassine Daadaa College of Computers and Information Technology Taif University Taif Saudi Arabia École de Technologie Supérieure University of Quebec Montreal Canada College of Computer and Information Sciences Al Imam Mohammad Ibn Saud Islamic University (IMSIU) Riyadh Saudi Arabia

ISBN: (纸本)9781665449496

ICT and digital Technologies have influenced the everyday life and the way how people learn and work. Nowadays, there is a variety of learning systems supporting innovative digital approaches and many schools, universities and organizations worldwide are investing in building their own e-Learning platforms. However, learners” performance still a concern that requests focus for improvement. The learning processes can be adapted to suit the needs of particular users when the proposed e-learning systems include context-awareness computing. We believe that instead of designing an e-Learning environment with hidden contextual information, e.g.: user's activity, location or nearby devices, we must consider a new e-Learning application approach including context-awareness capabilities. Such a system will be more efficient and adaptive to users' needs. Existing e-Learning systems suffer a lack of dynamic scalability. It's also complexes to extend, and expensive to integrate with other e-Learning platforms. In particular students who have visual processing disorder or hearing impairments can manipulate digital text or use adaptive modules like Subtitles which help them in processing the information effectively. This paper focus on the development of a hybrid e-Learning cloud system that combines the National Institute of Standards and Technology (NIST) architecture and various contexts aware computing such as User context, system context, and environment context that can quickly adjust to any environment change is expected. Were viewed traditional e-Learning architectures and their limitations and then proposed a hybrid cloud computing architecture to offer resources efficiently to all learning stakeholders and improve the education system quality at an affordable cost. To demonstrate the usefulness of the proposed system, we implemented and evaluated a simulation scenario. Based on our results, we highlight facts for increasing the cooperation and communication levels among

关键词： Context-aware services Performance evaluation Cloud computing Visualization Electronic learning Computational modeling systems operation

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Automatic Throughput and Critical Path Analysis of x86 and ARM Assembly Kernels 10

Automatic Throughput and Critical Path Analysis of x86 and A...

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10th IEEE/ACM Performance modeling, Benchmarking and simulation of High Performance computer systems (PMBS) held as part of the 31st ACM/IEEE international conference for High Performance Computing, Networking, Storage and Analysis (SC

作者： Laukemann, Jan Hammer, Julian Hager, Georg Wellein, Gerhard Friedrich Alexander Univ Erlangen Nurnberg Erlangen Reg Comp Ctr Erlangen Germany

ISBN: (纸本)9781728159775

Useful models of loop kernel runtimes on out-of-order architectures require an analysis of the in-core performance behavior of instructions and their dependencies. While an instruction throughput prediction sets a lower bound to the kernel runtime, the critical path defines an upper bound. Such predictions are an essential part of analytic (i.e., white-box) performance models like the Roofline and Execution-Cache-Memory (ECM) models. They enable a better understanding of the performance-relevant interactions between hardware architecture and loop code. The Open Source Architecture Code Analyzer (OSACA) is a static analysis tool for predicting the execution time of sequential loops. It previously supported only x86 (Intel and AMD) architectures and simple, optimistic full-throughput execution. We have heavily extended OSACA to support ARM instructions and critical path prediction including the detection of loop-carried dependencies, which turns it into a versatile cross-architecture modeling tool. We show runtime predictions for code on Intel Cascade Lake, AMD Zen, and Marvell ThunderX2 micro-architectures based on machine models from available documentation and semi-automatic benchmarking. The predictions are compared with actual measurements.

关键词： benchmarking performance modeling performance engineering architecture analysis static analysis

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Novel Synthesizable eFPGA based on Island Network with Multilevel Switch Boxes

Novel Synthesizable eFPGA based on Island Network with Multi...

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ACS/IEEE international conference on computer systems and Applications

作者： Hajer Saidi Mariem Turki Zied Marrakchi Abdulfattah Obeid Mohamed Abid CES Research Laboratory National Engineering School of Sfax Digital Research center of Sfax (CRNS) Sfax Sfax Tunisia CES Research Laboratory National Engineering School of Sfax Sfax Tunisia National Center for Electronics and Photonics Technology King Abdulaziz City for Science and Technology Riyadh Riyadh Saudi Arabia

ISBN: (数字)9781728185774

ISBN: (纸本)9781728185781

Flexibility, low latency, energy-efficiency, and low area, power, and cost are very important to consider for hardware and software implementation of VLSI circuits. With the advanced technology used to design these circuits especially the System on Chip, embedded FPGA (eFPGA) is one of the fields that has attracted extensive attention to ensure flexibility into SoC. Matrix and hierarchical architectures are the two most popular architectures used to design an FPGA. This paper present firstly an embedded FPGA with hierarchical architecture, the configuration of this eFPGA is ensured by a loader with a proposed model. Then, we propose the first embedded FPGA having a matrix architecture with a multi-level switch box. With the best of our knowledge, this is the first work that presents a decoder which loads the bitstream words to eFPGA SRAMs cells for the mesh of cluster architectures. A series of experimentation is conducted to evaluate the proposed eFPGAs. The static power, latency, and hardware utilization, as well as hardware implementation, are discussed and analyzed. Mesh of cluster eFPGA introduces an area overhead ≈ 2 times of tree eFPGA size which is correlated to static power but has a straightforward benefit in terms of frequency and performance, regularity, and easy to implement.

关键词： Field programmable gate arrays Switches Table lookup Hardware Topology Load modeling IP networks

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How to Bring Project Management of embedded systems to an Appropriate Level of Abstraction for a Discrete Event Model 43

How to Bring Project Management of Embedded Systems to an Ap...

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43rd IEEE-computer-Society Annual international computers, Software and Applications conference (COMPSAC)

作者： Weichenhain, Maxi Fengler, Wolfgang Streitferdt, Detlef TU Ilmenau Comp Sci & Automat Ilmenau Germany

ISBN: (纸本)9781728126074

To transform a systematic model of project management (PM) into a powerful discrete event model (DEM), these two concepts must be merged for mapping and simulation. To achieve this the modeling of PM, its complex tasks must be abstracted, and a decomposition of the entire model into subsystems including the interactions and their components has to be carried out. A merge can only take place if a common level of detailing and abstraction can be identified. In a DEM, the complexity is put into the connection of the subsystems. The behavior of the individual subsystems, however, is kept simple. [1]

关键词： discrete event model project management systematized approach formalism

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An Efficient Convolution Engine based on the À-trous Spatial Pyramid Pooling

An Efficient Convolution Engine based on the À-trous Spatia...

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international conference on Application Specific systems (ASAP), architectures and Processors

作者： Cristian Sestito Fanny Spagnolo Pasquale Corsonello Stefania Perri Department of Informatics Modeling Electronics and System Engineering Department of Mechanical Energy and Management Engineering University of Calabria Rende Italy

ISBN: (数字)9781728171470

ISBN: (纸本)9781728172798

This paper presents an efficient hardware architecture able to perform 2D dilated convolutions and suitable for the integration within modern heterogeneous embedded systems targeting semantic image segmentation. The proposed design supports multiple dilation rates. Moreover, it uses limited amounts of resources even when large convolution windows are processed. As a case study, the novel circuit has been integrated within a Xilinx Zynq-7000 FPSoC device to accelerate a state-of-the-art CNN model for medical images segmentation. Obtained results demonstrate that higher computational capabilities, reduced resources utilization and lower power consumption are achieved with respect to the competitors existing in literature.

关键词： Convolution Kernel computer architecture Hardware Two dimensional displays Image segmentation Acceleration

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A Template-based Framework for Exploring Coarse-Grained Reconfigurable architectures

A Template-based Framework for Exploring Coarse-Grained Reco...

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international conference on Application Specific systems (ASAP), architectures and Processors

作者： Artur Podobas Kentaro Sano Satoshi Matsuoka RIKEN Center for Computational Science (R-CCS) Kobe Japan

ISBN: (数字)9781728171470

ISBN: (纸本)9781728172798

Coarse-Grained Reconfigurable architectures (CGRAs) are being considered as a complementary addition to modern High-Performance Computing (HPC) systems. These reconfigurable devices overcome many of the limitations of the (more popular) FPGA, by providing higher operating frequency, denser compute capacity, and lower power consumption. Today, CGRAs have been used in several embedded applications, including automobile, telecommunication, and mobile systems, but the literature on CGRAs in HPC is sparse and the field full of research opportunities. In this work, we introduce our CGRA simulator infrastructure for use in evaluating future HPC CGRA systems. Our CGRA simulator is built on synthesizable VHDL and is highly parametrizable, including support for connectivity, SIMD, data-type width, and heterogeneity. Unlike other related work, our framework supports co-integration with third-party memory simulators or evaluation of future memory architecture, which is crucial to reason around memory-bound applications. We demonstrate how our framework can be used to explore the performance of multiple different kernels, showing the impact of different configuration and design-space options.

关键词： computer architecture System-on-chip Computational modeling Field programmable gate arrays Kernel Tools Bandwidth

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