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arXiv 2025年

作者： Garcia-Herrero, Francisco Valls, Javier Vergara-Picazo, Llanos Torres, Vicente Department of Computer Architecture and Automatics Complutense University of Madrid Madrid Spain Instituto de Telecomunicaciones y Aplicaciones Multimedia Universitat Politecnica de Valencia Valencia Spain

Understanding the impact of accuracy and speed when quantum error correction (QEC) decoders transition from floating-point software implementations to finite-precision hardware architectures is crucial for resource estimation on both classical and quantum sides. The final performance of the hardware implementation influences the code distance, affecting the number of physical qubits needed, and defines connectivity between quantum and classical control units, among other factors like refrigeration systems. This paper introduces a hardware emulator to evaluate QEC decoders using real hardware instead of software models. The emulator can explore 1013 different error patterns in 20 days with a single FPGA device running at 150 MHz, guaranteeing the decoder’s performance at logical rates of 10−12, the requirement for most quantum algorithms. In contrast, an optimized C++ software on an Intel Core i9 with 128 GB RAM would take over a year to achieve similar results. The emulator also enables storing patterns that generate logical errors for offline analysis and to design new decoders. Using results from the emulator, we propose a diversity-based method combining several belief propagation (BP) decoders with different quantization levels. Individually, these decoders may show sub-par error correction, but together they outperform the floating-point version of BP for quantum low-density parity-check (QLDPC) codes like hypergraph or lifted product. Preliminary results with circuit-level noise and bivariate bicycle codes suggest hardware insights can also improve software. Our diversity-based proposal achieves a similar logical error rate as BP with ordered statistics decoding, with average speed improvements ranging from 30% to 80%, and 10% to 120% in worst-case scenarios, while reducing post-processing algorithm activation by 47% to 96.93%, maintaining the same accuracy. © 2025, CC BY.

关键词： Qubits

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Modeling the stability of a computer system

Modeling the stability of a computer system

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作者： Lopez, Victoria Miñana, Guadalupe Department of Computer Architecture and Automatics Complutense University Madrid Spain

Performance, reliability and safety are relevant factors when analyzing or designing a computer system. Many studies about on performance are based on monitoring and analyzing data from a computer system. One of the most useful pieces of data is the Load Average (LA) that which shows the load average of the system in the last minute, the sequence of in the last five minutes and the sequence of in the last fifteen last minutes. There are a lot ofmany studies of the system performance based on the load average. This is shown by mean means of monitoring the commands of the operative system, but sometimes they are sometimes difficult to understand and far of removed from human intuition. The aim of this paper is to show demonstrate a new procedure that allows us to determine the stability of a computer system from a list of load average sample data. The idea is shown as an algorithm based in statistic analysis, the aggregation of information and its formal specification. The result is an evaluation of the stability of the load and the computer system by monitoring but without adding any overhead to the system. In addition, the procedure can be used as a software monitor for risk prevention of on any vulnerable system. © 2012 World Scientific Publishing Company.

关键词： Decision making

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Exploring Heterogeneous Computing Environments: A Preliminary Analysis of Python and SYCL Performance 11th

Exploring Heterogeneous Computing Environments: A Preliminar...

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11th Conference on Cloud Computing, Big Data and Emerging Topics, JCC-BD and ET 2023

作者： Faqir-Rhazoui, Youssef García, Carlos Department of Computer Architecture and Automatics Universidad Complutense de Madrid Madrid Spain

ISBN: (纸本)9783031409417

Python’s popularity has grown rapidly over the past decade due to its high productivity factor. While Python is popular in scientific computing, its interpreted nature and limitations on parallelization result in slower performance compared to compiled languages. Despite this, Python is still a valuable tool for high-performance computing (HPC) due to its ease of programming and optimization capabilities. This paper discusses the performance gap between Python and compiled languages like SYCL when working with heterogeneous computing environments and the challenges in developing portable and high-performance native extensions. It highlights the development of the dpctl Python library, which provides a portable and architecture-agnostic API for writing extensions and supports asynchronous SYCL kernel execution. We developed four benchmarks across CPU, integrated GPU, and discrete Intel Arc GPU, finding that SYCL outperformed Python in all cases, but optimizations could be made to improve Python performance. This research also highlights issues encountered when porting Python code, limitations in using Numpy, and current Intel Arc performance issues. © 2023, The Author(s), under exclusive license to Springer Nature Switzerland AG.

关键词： Python

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Robot formation control based on a multi-potential approach

Robot formation control based on a multi-potential approach

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作者： Cifuentes, Santiago Giron-Sierra, Jose M. Jimenez, Juan F. Department of Computer Architecture and Automatics Madrid Complutense University Madrid Spain

ISBN: (纸本)9781424474530

This paper proposes a new mobile robot formation control based on a multi-potential approach. The proposed method provides a pure reactive local mechanism that allows multiple robots to fit into formation pattern. Robots can deal with partially unknown scenarios and different formation patterns. The work is aimed to non-holonomic vehicles, constrains in speed and turn radius are considered. ©ICROS.

关键词： Mobile robots

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Fmotar: A fast multi-objective thermal aware routing algorithm for three-dimensional network-on-chips 50

Fmotar: A fast multi-objective thermal aware routing algorit...

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50th Summer computer Simulation Conference, SCSC 2018, Part of the 2018 Summer Simulation Multi-Conference, SummerSim 2018

作者： Majumdar, Amartya Dash, Ranjita K. Risco-Martín, José L. Turuk, Ashok K. Department of Computer Science and Engineering NIT Rourkela RourkelaOdisha India Department of Computer Architecture and Automatics Complutense University of Madrid Madrid Spain

ISBN: (纸本)9781510860209

Three-dimensional Network-on-Chip (3D NoC) is gaining popularity among designers due to its scalability, higher bandwidth, fault tolerance, and reliability. However, stacking of multiple dies leads to increase in power density and accumulation of heat flux, thereby causing severe thermal problems. Unequal traffic distribution across the chip and higher power density result in higher on-chip temperatures. This leads to performance degradation, increase in leakage power, and circuit failure. In this paper, we have proposed a thermal-aware adaptive routing algorithm called fast multi-objective thermal aware routing (FMoTAR) to optimize the thermal profile of 3D NoCs. The effectiveness of any adaptive routing algorithm is correlated to the selection strategy used for packet forwarding. In the proposed technique, routing function returns multiple admissible output channels. A selection function is used to select the output channel to which a packet will be forwarded. For faster convergence of finding minimal path from source to destination, a bidirectional search is carried out in FMoTAR. Analysis of the simulation results shows that on-chip traffic is more uniform in FMoTAR. This leads to reduction in the peak on-chip temperature. Moreover, the average propagation delay is lesser in FMoTAR in comparison to existing thermal-aware routing techniques. © 2018 Society for Modeling & Simulation International (SCS).

关键词： Network-on-chip

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Robot formation control based on a multi-potential approach

Robot formation control based on a multi-potential approach

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International Conference on Control, Automation and Systems ( ICCAS)

作者： Santiago Cifuentes Jose M. Giron-Sierra Juan F. Jimenez Department of Computer Architecture and Automatics Madrid Complutense University Madrid Spain

关键词： Collision avoidance Equations Mobile robots Navigation Vehicles Turning

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Project-Based Learning with historic buildings: immersion in real training environments for the Degree in Technical architecture

Project-Based Learning with historic buildings: immersion in...

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2021 International Conference of Innovation, Learning and Cooperation, CINAIC 2021

作者： Valentín-Gamazo, David Villanueva Durango, Nelson Tuesta García-Herrero, Francisco Blanco, Ma Isabel Mansilla de las Moras, Ma Cruz Rey Technical Teaching Department European University Miguel de Cervantes Valladolid Spain Department of Computer Architecture and Automatics Computer Science Faculty Complutense University of Madrid Madrid Spain Humanities Department European University Miguel de Cervantes Valladolid Spain

University education in the knowledge branches of Engineering and architecture, has usually been based on the system of assignments and projects as a practical dynamic of training and assessment in many subjects. With the EHEA arrival, the search for new complementary systems more focused on learning than on teaching or, in other words, on the student than on the teacher, boosted the commitment to the methodology known as Project Based Learning (PBL), oriented to the development of technical skills in contexts similar to those produced in professional environments. In general, these pedagogical scenarios are built on the basis of theoretical models inspired by real cases to a greater or lesser extent. This paper analyzes the method implemented since the 2017-2018 academic year to innovate in the compulsory subject of Rehabilitation, Restoration and Pathology of the Technical architecture Degree at the European University Miguel de Cervantes, when the PBL applied in case studies of existing historic buildings;providing students with heritage constructions to visit, recognize, measure, diagnose, draw, rehabilitate, restore, etc., and allowing their immersion in situations that introduce them to their future work practice reality. Copyright © 2021 for this paper by its authors. Use permitted under Creative Commons License Attribution 4.0 International (CC BY 4.0).

关键词： Students

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Dimensionality reduction of hyperspectral images using reconfigurable hardware

Dimensionality reduction of hyperspectral images using recon...

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International Conference on Field Programmable Logic and Applications

作者： Daniel Fenzández Carlos González Daniel Mozos Department of Computer Architecture and Automatics Complutense University of Madrid Madrid Spain

Remotely sensed hyperspectral imaging is a very active research area, with numerous contributions in the recent scientific literature. To carry out these investigations, it is necessary to collect large amounts of information that will be processed on satellite or airborne platforms using parallel processing techniques on multi core systems or Graphics Processing Units, trying to avoid excessive energy consumption. Due to the high dimensionality of the data, algorithms analyzing hyperspectral images have a high computational cost. This cost is a significant disadvantage in applications that require real-time response, such as fire tracing, prevention and monitoring of natural disasters, chemical spills and other environmental pollution, etc. To solve these problems, one of the solutions most used is the dimensional reduction, which removes noise and redundant information of images. Therefore, it is possible to reduce significantly the size of the images, and improve the complexity of the algorithms and data storage. Moreover, Field-Programmable Gate Arrays are specially recommended in remotely sensed applications that require real-time response due to their features such as reconfiguration, low consumption, compact size and high computing power on board. In this work, we propose the implementation in reconfigurable hardware of the principal component analysis (PCA) algorithm to carry out the dimensional reduction of hyperspectral images. Experimental results demonstrate that our hardware version of the PCA algorithm exhibits real-time performance.

关键词： Principal component analysis Hyperspectral imaging Field programmable gate arrays Covariance matrices Hardware Real-time systems

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Protecting the Ccsds 123.0-B-2 Compression Algorithm Against Single-Event Upsets for Space Applications

SSRN

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SSRN 2024年

作者： Báscones, Daniel García-Herrero, Francisco Ruano, Óscar González, Carlos Mozos, Daniel Maestro, Juan Antonio Department of Computer Architecture and Automatics UCM Profesor García Santesmases 9 Madrid28040 Spain

Hyperspectral imaging is an excellent tool to remotely analyse the Earth fromin-orbit devices. Satellites capture these images containing vast informationabout the ground pixels. To optimise storage and transmission speeds, com-pression is often performed onboard the satellite. To that end, algorithmssuch as the CCSDS 123.0-B-2 are implemented on FPGAs, enabling thisprocess in an efficient and fast manner. Single-Event Upsets (SEU) are com-monplace in this scenario: bit-flips in the FPGA’s configuration memorywhich can catastrophically alter the algorithm’s output. In this paper, wepropose a fault tolerance technique for this specific case. The compressioncore is checked periodically by running a golden model designed to excite thefull internal datapath based on a synthetic image. A failure in this checkwill trigger a reconfiguration of the compression core. Results show betterdetection rates than Dual Modular Redundancy (DMR) at a fraction of theresource cost, proving this technique as a viable alternative. Furthermore,other algorithms with similar processing flows might benefit as well from thistechnique. © 2024, The Authors. All rights reserved.

关键词： Field programmable gate arrays (FPGA)

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A biologically inspired architecture for control of grasping movements of an anthropomorphic gripper

A biologically inspired architecture for control of grasping...

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10th International Conference on Climbing and Walking Robots, CLAWAR 2007

作者： Varona Moya, S. Molina Vilaplana, J. Linares Barranco, A. Feliú Battle, J. López Coronado, J. Department of Systems Engineering and Automatics Polytechnic University of Cartagena Campus Muralla Del Mar C/Dr. Fleming S/N 30202 Cartagena Murcia Spain Department of Computer Technology and Architecture University of Sevilla Avda. Reina Mercedes S/N 41012 Sevilla Spain

ISBN: (纸本)9812708154

In this paper we introduce a research plan for the development of an architecture for control of grasping movements in a manipulation system. It consists in an anthropomorphic robotic gripper with tactile and propioceptive sensing capability plus a stereoscopic visual guidance system, electronic control boards designed for implementing a powerful and neurologically inspired inter-chip communication technique called AER and a HYPBF neural networks model that will emulate the performance of the most important brain areas involved in motor behaviour control for efficient object manipulation. © 2007 World Scientific Publishing Co. Pte. Ltd.

关键词： Stereo image processing

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