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East-West Design & Test Symposium (EWDTS)

作者： Binod Kumar Boda Nehru Brajesh Pandey Virendra Singh Jaynarayan Tudu Computer Architecture and Dependable Systems Lab (CADSL) Indian Institute of Technology Bombay India Dept. of Computer Science and Automation Indian Institute of Science Bangalore

ISBN: (纸本)9781509006946

Power dissipation is a major issue with testing of designs having full scan architectures. The proposed scan technique minimizes toggle activity while scanning in test patterns. The method uses bit inversion technique to avoid toggles in scan flip-flops. The setup is dynamically configurable to one among the logic reversal structure and traditional scan while shift-in/shift-out of test patterns. Experimental results indicate that the average toggle activity is minimized substantially compared to California Scan architecture. It has features of full diagnosability of single stuck-at faults along the scan chain path.

关键词： computer architecture Silicon Circuit faults Testing Logic gates Inverters Clocks

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Real-time signal processing in a collision avoidance radar system using parallel computing 7th

Real-time signal processing in a collision avoidance radar s...

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7th International Conference on High-Performance Computing and Networking, HPCN Europe 1999

作者： Reijns, G.L. Van Gemund, A.J.C. Schier, J. Dept. of Information Technology and Systems Lab. of Computer Architecture and Digital Technique Delft University of Technology Netherlands Inst. of Information Theory and Automation Czech Academy of Sciences Czechia Int. Research Inst. for Telecom-transmission and Radar Delft University of Technology Netherlands

ISBN: (纸本)3540658211

COLARADO (an acronym for collision avoidance radar able to distinguish obstacles) is a system for use in the control of autonomously driven vehicles, having static radar antennas. By combining the echos, resulting from 2 continuously emitting transmitters and 3 receivers, it is possible to compute the locations of obstacles in 3 dimensions. The main problem is to separate the real obstacles from ghosts amongst noise and clutter, up to a distance of 12.8 m. This paper discusses the signal processing algorithms as well as the related real-time parallel computer hardware and system software. © Springer-Verlag Berlin Heidelberg 1999.

关键词： computer hardware

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A Unified Cloud-Enabled Discrete Event Parallel and Distributed Simulation architecture

arXiv

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arXiv 2023年

作者： Risco-Martín, José L. Henares, Kevin Mittal, Saurabh Almendras, Luis F. Olcoz, Katzalin Dept. of Computer Architecture and Automation Universidad Complutense de Madrid Madrid28040 Spain The MITRE Corporation FairbornOH United States

Cloud infrastructure provides rapid resource provision for on-demand computational requirements. Cloud simulation environments today are largely employed to model and simulate complex systems for remote accessibility and variable capacity requirements. In this regard, scalability issues in Modeling and Simulation (M&S) computational requirements can be tackled through the elasticity of on-demand Cloud deployment. However, implementing a high performance cloud M&S framework following these elastic principles is not a trivial task as parallelizing and distributing existing architectures is challenging. Indeed, both the parallel and distributed M&S developments have evolved following separate ways. Parallel solutions has always been focused on ad-hoc solutions, while distributed approaches, on the other hand, have led to the definition of standard distributed frameworks like the High Level architecture (HLA) or influenced the use of distributed technologies like the Message Passing Interface (MPI). Only a few developments have been able to evolve with the current resilience of computing hardware resources deployment, largely focused on the implementation of Simulation as a Service (SaaS), albeit independently of the parallel ad-hoc methods branch. In this paper, we present a unified parallel and distributed M&S architecture with enough flexibility to deploy parallel and distributed simulations in the Cloud with a low effort, without modifying the underlying model source code, and reaching important speedups against the sequential simulation, especially in the parallel implementation. Our framework is based on the Discrete Event System Specification (DEVS) formalism. The performance of the parallel and distributed framework is tested using the xDEVS M&S tool, Application Programming Interface (API) and the DEVStone benchmark with up to eight computing nodes, obtaining maximum speedups of 15.95× and 1.84×, respectively. © 2023, CC BY-SA.

关键词： Discrete event simulation

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Efficient micro data centres deployment for mobile healthcare monitoring systems in IoT urban scenarios

arXiv

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arXiv 2023年

作者： Henares, Kevin Risco-Martín, José L. Ayala, José L. Hermida, Román Dept. of Computer Architecture and Automation Complutense University of Madrid Calle Prof. José García Santesmases 9 Madrid28040 Spain

In the last decade, the Internet of Things paradigm has caused an exponential increase in the number of connected devices. This trend brings the Internet closer to everyday activities and enables data collection that can be used to create and improve a great variety of services and applications. Despite its great benefits, this paradigm also comes with several challenges. More powerful storage and processing capabilities are required to service all these devices. Additionally, the need to deploy and manage the infrastructure to efficiently support these resources continues to pose a challenge. Modeling and simulation can help to design and analyze these scenarios, providing flexible and powerful mechanisms to study and compare different strategies and infrastructures. In this scenario, Micro Data Centers (MDCs) can be used as an effective way of reducing overwhelmed Cloud Data Center infrastructures. This paper explores an M&S methodology to study the overall power consumption of a healthcare IoT scenario. The patients wear non-intrusive monitoring devices that periodically generate tasks to be executed in MDCs. We extract the layout of existing urban infrastructures, simulate the monitored population's behavior, and compare the power consumption of several data center configurations. © 2023, CC BY-SA.

关键词： Internet of things

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Control of Microgrid Cluster Using Raspberry Pi

Control of Microgrid Cluster Using Raspberry Pi

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Energy Technologies for Future Grids (ETFG), IEEE International Conference on

作者： David Carrasco-González Raúl Sarrias-Mena Pablo Horrillo-Quintero Francisco Llorens-Iborra Luis M. Fernández-Ramírez Department of Electrical Engineering SURET Research Group University of Cadiz (UCA) Spain Dept. of Engineering in Automation Electronics and Computer Architecture and Networks SURET Reseach Group UCA Spain

Currently, microgrid clusters (MGC) are being increasingly used owing to their benefits and human needs. MGs can be composed of power generation, consumption, and storage elements. They permit the combination of DC and AC technologies, even for a single microgrid (MG). In this paper, a new control system of a MGC consisting of two MGs connected to the main grid is developed. One of them is a DC MG that is composed of a wind turbine (WT), electrolyzer (EZ), ultracapacitor (UC), fuel cell (FC) and DC loads. The other MG is an AC MG, which is made up of a PV generator, a battery bank and AC loads. The MGC is tested under different working conditions in an experimental setup composed of a Raspberry Pi microcontroller, an OPAL-RT 4510 unit and a PC host. The experimental setup allows the system to run in real time and validate the results obtained. Finally, the control system implemented in the MGC exhibits a correct behaviour under different conditions, according to the results obtained.

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Parameter Analysis of Monte Carlo Simulation Model for Improvement of Its Performance with High Accuracy of Reliability Estimations of Radiocommunication Equipment

Parameter Analysis of Monte Carlo Simulation Model for Impro...

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International Siberian Conference on Control and Communications

作者： Alexander Lyubchenko Stanislav Bartosh Pedro A. Castillo Maribel G. Arenas Evgeniy Kopytov Institute of Automation Telecommunication and IT Omsk State Transport University Omsk Russian Federation Dept. of Computer Architecture and Technology University of Granada Granada Spain Dept. of Communication and Information Safety Omsk State Technical University Omsk Russian Federation

ISBN: (纸本)9781467383844

computer based simulation technology remains one of the most popular approaches in the research field. It has the advantages with comparison to analytical methods for some applications. However, it requires implementing procedures devoted to the determination of developing simulation model's parameters in order to provide better performance and accuracy of the results. In the paper, the developed model of functioning process of the radiocommunication devices was briefly described. Parameters estimation of the model was performed and the smoothing and interpolation methods were chosen.

关键词： simulation smoothing interpolation reliability indexes availability radicommunication devices

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Optimizing L1 Cache for Embedded Systems through Grammatical Evolution

arXiv

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arXiv 2023年

作者： Álvarez, Josefa Díaz Colmenar, J. Manuel Risco-Martín, José L. Lanchares, Juan Garnica, Oscar Centro Universitario de Mérida Universidad de Ex-tremadura Mérida06800 Spain Dept. of Computer Science and Statistics Universidad Rey Juan Carlos Móstoles28933 Spain Dept. of Computer Architecture and Automation Universidad Complutense de Madrid Madrid28040 Spain

Nowadays, embedded systems are provided with cache memories that are large enough to influence in both performance and energy consumption as never occurred before in this kind of systems. In addition, the cache memory system has been identified as a component that improves those metrics by adapting its configuration according to the memory access patterns of the applications being run. However, given that cache memories have many parameters which may be set to a high number of different values, designers face to a wide and time-consuming exploration space. In this paper we propose an optimization framework based on Grammatical Evolution (GE) which is able to efficiently find the best cache configurations for a given set of benchmark applications. This metaheuristic allows an important reduction of the optimization runtime obtaining good results in a low number of generations. Besides, this reduction is also increased due to the efficient storage of evaluated caches. Moreover, we selected GE because the plasticity of the grammar eases the creation of phenotypes that form the call to the cache simulator required for the evaluation of the different configurations. Experimental results for the Mediabench suite show that our proposal is able to find cache configurations that obtain an average improvement of 62% versus a real world baseline configuration. © 2023, CC BY-SA.

关键词： Embedded systems

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POSTER: Performance evaluation of a signal extraction algorithm for the Cherenkov Telescope Array's Real Time Analysis pipeline 16

POSTER: Performance evaluation of a signal extraction algori...

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16th IEEE International Conference on Cluster Computing, CLUSTER 2014

作者： Rodriguez-Vazquez, Juan Jose Vazquez-Poletti, Jose Luis Delgado, Carlos Bulgarelli, Andrea Cardenas-Montes, Miguel Department of Fundamental Research CIEMAT Avda. Complutense 40 Madrid28040 Spain Dept. of Computer Architecture and Automation Complutense University of Madrid C/ Profesor José García Santesmases s/n Madrid28040 Spain Istituto di Astrofisica Spaziale e Fisica Cosmica - Bologna Istituto Nazionale di Astrofisica Via Piero Gobetti 101 Bologna40129 Italy

ISBN: (纸本)9781479955480

In this paper, several versions of a signal extraction algorithm, pertaining to the entry stage of the Cherenkov Telescope Array's Real Time Analysis pipeline, were implemented and optimised using SSE2, POSIX threads and CUDA. Results of this proof of concept let us gain an insight into the suitability of each platform, and the performance each one can deliver, to carry out this particular task. © 2014 IEEE.

关键词： Pipelines

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Modular framework to model critical events in stroke patients 51

Modular framework to model critical events in stroke patient...

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51st Summer computer Simulation Conference, SCSC 2019, Held at the Summer Simulation Conference, SummerSim 2019

作者： Henares, Kevin Risco-Martín, José L. Hermida, Román Roselló, Gemma Reig Cárdenas, Román Dept. of Computer Architecture and Automation Complutense University of Madrid Calle Prof. José García Santesmases 9 Madrid28040 Spain Stroke Care Unit Hospital Universitario de La Princesa Madrid Calle de Diego de León 62 Madrid28006 Spain Universidad Politécnica de Madrid ETSI Telecomunicación Avenida Complutense 30 Madrid28040 Spain

Several of the major causes of death in the world are related to neurological diseases, like strokes, sclerosis, or Parkinson’s. As a consequence, extraordinary amounts of clinical information are collected. With proper Modeling and Simulation (MS) techniques, predictive models can be defined to help physicians in their diagnoses. We have come to the conclusion that the implementation of an abstract MS methodology to facilitate the processing and modeling of the collected data would be of great help. In this paper, we focus on the development of such an abstract framework, mainly aimed at facilitating and automating the process of data collection and predictive and diagnose models. As a use case, we show how this methodology is applied to determine the stroke type and exitus (i.e. probability of death) of stroke patients in the early stages of their episodes. The best models are evaluated and constantly updated to generate these predictions. © 2019 Society for Modeling & Simulation International (SCS).

关键词： Diagnosis

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Simulation of High-Performance Memory Allocators

Simulation of High-Performance Memory Allocators

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Euromicro Symposium on Digital System Design

作者： Jose L. Risco-Martín J. Manuel Colmenar David Atienza J. Ignacio Hidalgo Dept. of Computer Architecture and Automation Complutense University of Madrid Madrid Spain C.E.S. Felipe II Complutense University of Madrid Aranjuez Spain Embedded Systems Laboratory (ESL) EPFL Lausanne Switzerland

Current general-purpose memory allocators do not provide sufficient speed or flexibility for modern high-performance applications. To optimize metrics like performance, memory usage and energy consumption, software engineers often write custom allocators from scratch, which is a difficult and error-prone process. In this paper, we present a flexible and efficient simulator to study Dynamic Memory Managers (DMMs), a composition of one or more memory allocators. This novel approach allows programmers to simulate custom and general DMMs, which can be composed without incurring any additional runtime overhead or additional programming cost. We show that this infrastructure simplifies DMM construction, mainly because the target application does not need to be compiled every time a new DMM must be evaluated. Within a search procedure, the system designer can choose the "best" allocator by simulation for a particular target application. In our evaluation, we show that our scheme will deliver better performance, less memory usage and less energy consumption than single memory allocators.

关键词： Memory management Resource management Energy consumption Dynamic scheduling Software Computational modeling Algorithm design and analysis

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