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检索条件"机构=UNAM Computer Engineering"

共 112 条记录，以下是1-10 订阅

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Consistent IoT Systems: A Perspective Based on Paraconsistent Descriptive Logic

Consistent IoT Systems: A Perspective Based on Paraconsisten...

引用

International Conference on Intelligent Environments (IE)

作者： Miguel Pérez-Gaspar Javier Gomez Everardo Bárcenas Francisco García Dept. of Telecommunications UNAM Mexico City Mexico Department of Computer Engineering UNAM Mexico City Mexico

ISBN: (数字)9798350386790

ISBN: (纸本)9798350386806

Internet of Things (IoT) devices generate vast and often contradictory data streams. This poses a challenge for IoT systems, which must make accurate and reliable decisions based on this data. Paraconsistent descriptive logic (PDL) is a branch of non-classical logic that can handle inconsistencies without compromising data reliability. We propose the integration of PDL into IoT systems to improve data coherence and reliability. We also introduce a Consistency Theorem that establishes rules for managing inconsistencies systematically and in a controlled way. Our efforts aim to pave the way for more robust, reliable, and user-friendly IoT systems.

关键词： Accuracy Coherence Reliability theory Internet of Things Logic Streams

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Non-Orthogonal Multiplexing Access (NOMA)-based Dense Passive Optical Networks Considering Fairness under Differential Split Ratios

Non-Orthogonal Multiplexing Access (NOMA)-based Dense Passiv...

引用

2024 Signal Processing in Photonic Communications, SPPCom 2024

作者： Wei, Zixian Zhang, Jinsong Li, Weijia St-Arnault, Charles Bernal, Santiago Khalil, Mostafa Gutiérrez-Castrejón, Ramón Chen, Lawrence R. Plant, David V. Department of Electrical and Computer Engineering McGill University MontrealQCH3A 0E9 Canada Institute of Engineering Universidad Nacional Autonoma de Mexico UNAM Cd. Universitaria Mexico City04510 Mexico

We demonstrate a NOMA-based 200-G coherent PON for two access users with a differential split ratio, where the fairness and performance of far-end users with 256 SR are increased by adjusting the power allocation fact... 详细信息

关键词： Passive optical networks

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Spatial Diversity in Non-Orthogonal Multiplexing Access (NOMA)-based Coherent Optical Transmission under Differential Path Loss

Spatial Diversity in Non-Orthogonal Multiplexing Access (NOM...

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2024 Signal Processing in Photonic Communications, SPPCom 2024

We first demonstrate a MISO coherent optical transmission based on joint NOMA and spatial diversity, where maximal ratio combining brings 1.764-dB diversity gain for two high-path-loss 120-km and 140-km branches. ... 详细信息

关键词： Light transmission

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Adapting Detection in Blockchain-enabled Federated Learning for IoT Networks

Adapting Detection in Blockchain-enabled Federated Learning ...

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2023 International Conference on Electrical, computer, Communications and Mechatronics engineering, ICECCME 2023

作者： López, David Farooq, Bilal Al Mallah, Ranwa Instituto de Ingenería Unam Mexico City Mexico Toronto Metropolitan University Tmu Toronto Canada Royal Military College of Canada Department of Electrical and Computer Engineering Kingston Canada

ISBN: (纸本)9798350322972

Blockchain-enabled Federated Learning (FL) is a decentralized approach to coordinate nodes during the training of a machine learning model in order to enhance privacy and save network resources (e.g., bandwidth). However, malicious nodes may try to sabotage the training by carrying out poisoning attacks to hinder the performance of the model. An effective defense to have on the blockchain is a mechanism to monitor the behaviour of the nodes, detect the malicious nodes, and remove them from the training. This work proposes a multiobjective optimization algorithm that adapts local training and model sharing on the blockchain to the wireless and mobile environment of the nodes. The results show an improvement in terms of time, bandwidth, and energy consumption when the optimization of the selection of the proportion of miners responsible for the monitoring and consensus was adapted to take into account multiple factors related to the communication network. © 2023 IEEE.

关键词： Multiobjective optimization

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Design and evaluation of indoor wireless ad hoc network using BATMAN-adv with mobile robots

Design and evaluation of indoor wireless ad hoc network usin...

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IEEE Conference on Industrial Electronics and Applications (ICIEA)

作者： Alejandro Velázquez-Mena Héctor Benítez-Pérez Rita C. Rodríguez-Martínez Ricardo F. Villarreal-Martínez Department of Computer Engineering School of Engineering UNAM Mexico Institute of Research in Applied Mathematics and Systems (IIMAS) UNAM Mexico

ISBN: (纸本)9781665409858

The mesh networks are one alternative because it has three essential characteristics: scalable, cooperative work, and self-organization. This type of network can solve problems of load assignment, distribution of tasks, and resources. One alternative to wireless networks (WLAN) is possible to communicate with multiple nodes, but the mesh networks can have connectivity with all nodes. However, it has been observed that in the literature, there is no implementation of this version (B.A.T.M.A.N. version V) of the protocol in indoor situations. Therefore, in this article, a mesh wireless network with heterogeneous devices is proposed to testbed the protocol with conditions in areas with different levels of obstructions applying teleoperation.

关键词： Mesh networks Wireless LAN Protocols Service robots Network topology Wireless networks Stairs

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High accuracy localization of acoustic perturbation on a 60-km bidirectional coherent transmission system using a frequency-locked DFB laser

High accuracy localization of acoustic perturbation on a 60-...

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Optical Sensing and Precision Metrology 2025

作者： Hu, Yixiang Gutiérrez-Castrejón, Ramón Zhang, Kaibo Robin, Daniel Ayotte, Simon Cardin, Vincent Plant, David V. Department of Electrical and Computer Engineering McGill University MontréalQCH3A 0E9 Canada Institute of Engineering Univ. Nacional Autónoma de México UNAM Cd. Universitaria CdMx04510 Mexico TeraXion 2716 rue Einstein QuébecQCG1P 4S8 Canada

ISBN: (数字)9781510685093

ISBN: (纸本)9781510685086

Fiber sensing is attracting more and more research interest, and it brings new opportunities to the optical telecom network. Here, we employ a 60 km bidirectional coherent transmission system to realize distributed vibration sensing. A vibration, positioned at 20 km from the east and 40 km from the west terminals, induces length fluctuation of the fiber which transduces into phase fluctuations on the transmitted light. The instantaneous phase of the beating of the transmitted light and LO lasers is obtained in the digital domain. The position of the vibration is resolved by locating the peak in the cross-correlation of the measured instantaneous phase at both ends. Through comparison experiments of four narrow linewidth semiconductor lasers following a statistical approach, it is found that the localization accuracy strongly depends on the laser frequency noise level. We obtained the best localization accuracy using a DFB semiconductor laser electrically locked on an optical reference, both packaged in a common 14-pin butterfly. Its frequency noise is 35 Hz2/Hz at 2 kHz and it has a linewidth of 0.1 kHz. Employing this low-noise laser, we successfully detected an acoustic perturbation with a localization error of only 23 meters for a vibration at 2 kHz with a bandwidth of 400 Hz. In contrast, a free-running DFB laser and two external cavity lasers proved too noisy to obtain a localization error better than a few kilometers using the same excitation. © 2025 SPIE.

关键词： Linewidth

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Impact of the Gain Recovery Time of a QD-SOA on Transmission System Amplification

Impact of the Gain Recovery Time of a QD-SOA on Transmission...

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2024 Conference on Lasers and Electro-Optics, CLEO 2024

作者： St-Arnault, Charles Bernal, Santiago Gutiérrez-Castrejón, Ramón Berikaa, Essam Wei, Zixian Rautert, Janina Poltavtsev, Sergey V. Gubenko, Alexey E. Belykh, Vasilii V. Mikhrin, Vladimir S. Kovsh, Alexey R. Plant, David V. Dept. of Electrical and Computer Engineering McGill University MontrealQCH3A 0G4 Canada Institute of Engineering Univ. Nacional Autónoma de México UNAM Cd. Universitaria 04510 Mexico Innolume GmbH Konrad-Adenauer-Allee 11 Dortmund44263 Germany Alfalume Inc Los GatosCA United States

We experimentally evaluate the influence of the gain recovery time of a QD-SOA on IM/DD in the O-band and establish a way to estimate the gain recovery time of an SOA. © Optica Publishing Group 2024 © 2024 T... 详细信息

ISBN: (纸本)9781957171395

关键词： Optical waveguides

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Impact of the Gain Recovery Time of a QD-SOA on Transmission System Amplification

Impact of the Gain Recovery Time of a QD-SOA on Transmission...

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CLEO: Science and Innovations in CLEO 2024, CLEO: S and I 2024 - Part of Conference on Lasers and Electro-Optics

作者： St-Arnault, Charles Bernal, Santiago Gutiérrez-Castrejón, Ramón Berikaa, Essam Wei, Zixian Rautert, Janina Poltavtsev, Sergey V. Gubenko, Alexey E. Belykh, Vasilii V. Mikhrin, Vladimir S. Kovsh, Alexey R. Plant, David V. Dept. of Electrical and Computer Engineering McGill University MontrealQCH3A 0G4 Canada Institute of Engineering Univ. Nacional Autónoma de México UNAM Cd. Universitaria04510 Mexico Innolume GmbH Konrad-Adenauer-Allee 11 Dortmund44263 Germany Alfalume Inc. Los GatosCA United States

We experimentally evaluate the influence of the gain recovery time of a QD-SOA on IM/DD in the O-band and establish a way to estimate the gain recovery time of an SOA. © Optica Publishing Group 2024

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Blockchain-enabled Efficient and Secure Federated Learning in IoT and Edge Computing Networks

Blockchain-enabled Efficient and Secure Federated Learning i...

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International Conference on Computing, Networking and Communications (ICNC)

作者： Ranwa Al Mallah David López Talal Halabi Dept. of Electrical and Computer Engineering Royal Military College of Canada Kingston Canada Instituto de Ingenería UNAM Mexico City Mexico Dept. of Computer Science Université Laval Québec Canada

Federated learning (FL) has proven to be a promising solution to enable on-device machine learning over massive data generated by Internet of Things (IoT) devices at the network edge. However, the wide vulnerability space of the IoT network increases the risk of model poisoning attacks carried out by malicious or compromised IoT devices against FL model training. This paper proposes to exploit the use of blockchain technology to perform optimized monitoring of the behavior of IoT devices and select only reliable ones to provide model updates to the global FL model while preserving network performance. We formulate our worker device monitoring problem as an optimization problem and solve it to produce the optimal number of monitoring miners in the blockchain network in order to reduce the latency, bandwidth and energy consumption in the overall IoT network. Our results show that the optimal monitoring solution was able to reduce by 75% the total delay incurred by the IoT devices during training.

关键词： Training Performance evaluation Federated learning Blockchains Behavioral sciences Internet of Things Task analysis

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On the Decentralization of Attribute-Based Encryption Schemes

On the Decentralization of Attribute-Based Encryption Scheme...

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Mexican International Conference on computer Science (ENC)

作者： Melissa Brigitthe Hinojosa-Cabello Rocio Alejandra Aldeco-Perez Miguel Morales-Sandoval Jose Juan Garcia-Hernandez Cinvestav Unidad Tamaulipas Ciudad Victoria Tamps Mexico School of Engineering UNAM Coyoacan Mexico City Mexico Computer Science Department INAOE Tonantzintla Puebla Mexico

Nowadays, cloud services are used for outsourcing the high processing and storage requirements demanded under Internet of Things (IoT) application scenarios. However, since cloud storage providers are not fully trustworthy, the major security concerns within this context are confidentiality and access control of outsourced sensitive data. In this sense, AttributeBased Encryption (ABE) is a type of cryptographically enabled access control that allows secure and fine-grained data-sharing with multiple users. With ABE, simultaneous provision of access control and confidentiality features is achieved by means of (1) access control policies used for data encryption, and (2) attribute sets that further describe the users’ access capabilities. Despite the advantages provided by ABE, some issues still limit its efficient deployment in practical applications. One of these constraints is the centralized approach and dependency on a single trusted authority. In this work, we cope with the strong dependency of ABE schemes on a single trusted authority. Our decentralization approach aims to eliminate single points of failure by distributing between multiple entities the ABE trusted authority’s tasks, namely users’ secret key generation, and management. In this approach, we focus on a permissioned blockchain solution compliant with ABE typical deployments where system users are known and belong to specific organizational domains.

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