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NIS02-6: A Game for Ad Hoc Network Connectivity in the Presence of Malicious Users

NIS02-6: A Game for Ad Hoc Network Connectivity in the Prese...

引用

IEEE Globecom 2006

作者： George Theodorakopoulos John S. Baras Department of Electrical and Computer Engineering Institute for Systems Research University of Maryland College Park MD USA

Ad hoc network users are resource constrained: Before transmitting data, they have to take into account the energy expenditure involved. Even if a user is, in principle, willing to spend energy to improve network connectivity, his actual decision will be heavily influenced by the decisions of his neighboring users, since they act as relay nodes for him. Moreover, some of the neighbors may not be as benign as he is; in fact, they could be outright malicious. We are abstracting the tradeoff between spending energy and increasing connectivity by modeling the interaction of a user with his one-hop neighbors in a game theoretic fashion. Two types of users exist: Good users willingly trade energy for connectivity, but only if they expect their neighbors to do the same; Bad users try to destroy connectivity, but also lure the Good users to waste energy. Within our model for user behavior and sophistication, we explore outcomes that can arise in this graphical game.

关键词： Ad hoc networks Game theory Throughput Wireless networks Telecommunication traffic Network topology Frequency estimation Educational institutions Relays Traffic control

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Robust adaptive control of underwater vehicles with biologically inspired vortex ring thrusters

Robust adaptive control of underwater vehicles with biologic...

引用

3rd IFAC Workshop on Navigation, Guidance and Control of Underwater Vehicles, NGCUV 2012

作者： Xu, Y. Mohseni, K. Department of Mechanical and Aerospace Engineering University of Florida Gainesville FL 32611-6250 United States Department of Electrical and Computer Engineering University of Florida Gainesville FL 32611-6250 United States Institute for Networked Autonomous Systems University of Florida Gainesville FL 32611-6250 United States

ISBN: (纸本)9783902823199

A novel underwater thruster was designed to provide quantized level of thrusts for underwater vehicle maneuvering with a minimal effect on the drag profile of the vehicle. The design was inspired by the efficient and agile locomotion mechanism in squid and jellyfish, which is characterized by formation of vortex rings from pulsatile jets. There have been several successful implementations of the device on a series of autonomous underwater vehicles in our group. In this paper, a robust adaptive control algorithm is formulated for future vehicles with new, more compact thrusters of this type. Control strategy for motion in 6 degrees of freedom, together with corresponding force allocation method is developed and is tested in simulation, where an asymptotic position and velocity tracking result is obtained.

关键词： Robust control

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Increasing security in wireless e-health systems

Increasing security in wireless e-health systems

引用

IEEE International Symposium on Signal Processing and Information Technology (ISSPIT)

作者： Andreas Papalambrou John Gialelis Dimitrios Serpanos Industrial Systems Institute/R.C. ATHENA and Department of Electrical and Computer Engineering University of Patras

In this paper, we identify the security and privacy issues specific to wireless health monitoring devices and describe solutions for protecting wireless communications against side channel attacks and in particular traffic analysis attacks. This process takes place by means of data obfuscation and modifications of communication protocol architectures in order to limit exposed information of system architecture to potential attackers. Initial network simulations of the proposed methods show the feasibility of these methods.

关键词： Cryptography Wireless sensor networks Wireless communication Irrigation Privacy Limiting

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Learning Agent Interactions from Density Evolution in 3D Regions With Obstacles

Learning Agent Interactions from Density Evolution in 3D Reg...

引用

IEEE Conference on Decision and Control

作者： Amoolya Tirumalai Christos N. Mavridis John S. Baras Department of Electrical and Computer Engineering Institute for Systems Research University of Maryland College Park MD USA

In this work, we study the inverse problem of identifying complex flocking dynamics in a domain cluttered with obstacles. We get inspiration from animal flocks moving in complex ways with capabilities far beyond what current robots can do. Owing to the difficulty of observing and recovering the trajectories of the agents, we focus on the dynamics of their probability densities, which are governed by partial differential equations (PDEs), namely compressible Euler equations subject to non-local forces. We formulate the inverse problem of learning interactions as a PDE-constrained optimization problem of minimizing the squared Hellinger distance between the histogram of the flock and the distribution associated to our PDEs. The numerical methods used to efficiently solve the PDE-constrained optimization problem are described. Realistic flocking data are simulated using the Boids model of flocking agents, which differs in nature from the reconstruction models used in our PDEs. Our analysis and simulated experiments show that the behavior of cohesive flocks can be recovered accurately with approximate PDE solutions.

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The Capacity of the Asynchronous Compound Multiple Access Channel and Results for Random Access systems

The Capacity of the Asynchronous Compound Multiple Access Ch...

引用

IEEE International Symposium on Information Theory

作者： Brooke Shrader Anthony Ephremides Electrical and Computer Engineering Department and Institute for Systems Research University of Maryland College Park MD USA

ISBN: (纸本)142440505X

The capacity region of an asynchronous system with two sources and two receivers is analyzed. The capacity region is first derived for a general discrete memoryless channel. The result is then applied to a random access system in which sources may either transmit information-bearing symbols or idle (empty) symbols in each time slot. The capacity region for this random access system is compared to the corresponding queueing stability region and it is demonstrated that the two regions do not coincide. This comparison is the primary contribution of our work; our result is a deviation from all previous results on the relation between information-theoretic capacity and queueing stability for random access systems

关键词： Stability Clocks Memoryless systems Feedback Educational institutions Delay effects Access protocols Redundancy Channel coding Synchronization

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Performance comparison of two sequential change detection algorithms on detection of in-band wormholes

Performance comparison of two sequential change detection al...

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Annual Conference on Information Sciences and systems (CISS)

作者： Shanshan Zheng Tao Jiang John S. Baras Institute of Systems Research Department of Electrical and Computer Engineering University of Maryland College Park MD USA

This paper compares the performance of parametric and non-parametric sequential change detection algorithms for detecting in-band wormholes in wireless ad hoc networks. The algorithms considered are the non-parametric cumulative sum (NP-CUSUM) and the repeated sequential probability ratio test (R-SPRT). Theoretical performance of the two is compared using metrics that take into account the algorithms' repeated nature, and the advantage of the parametric method is illustrated. On the other hand, connections between the parametric and non-parametric methods are made in the proposed worst case adversary model, where the non-parametric method is shown to be more robust to attack strategy changes. Experimental evaluation of wormhole detection schemes based on the two algorithms is presented. This work has implications for both the theoretical understanding and practical design of wormhole detection schemes based on parametric and nonparametric change detection algorithms.

关键词： Detection algorithms Change detection algorithms Tunneling Mobile ad hoc networks Algorithm design and analysis Sequential analysis Timing Statistical analysis Routing Delay

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Witsenhausen's Counter Example Holds in the Presence of Side Information

Witsenhausen's Counter Example Holds in the Presence of Side...

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IEEE Conference on Decision and Control

作者： Nuno C Martins Department of Electrical and Computer Engineering and the Institute for Systems Research University of Maryland College Park MD USA

ISBN: (纸本)1424401704;9781424401703

In this paper, we consider a two-step decentralized control problem with two agents which are not co-located. The first agent is located at the source of a disturbance, it can measure the disturbance with high accuracy and it can perform local actuation, while communicating with the second agent via a Gaussian channel with a prescribed signal to noise ratio. What remains of the disturbance, after the control action of the first agent, will hit the second agent after a fixed delay. The second agent has noisy measurements as well as the information conveyed through the communication channel to decide on the best strategy to reduce the effects of the remaining disturbance. The control design paradigm is to minimize a quadratic cost combining the control power of the first agent and the final effect of the disturbance at the second agent. Such a framework can be viewed as an extension of the well known Witsenhausen's counter-example which did not include a communication channel. In the absence of a channel, Hans Witsenhausen has shown, by means of an example, that nonlinear strategies outperform the best linear strategy. This result is not obvious because the framework is linear and Gaussian, and the cost is quadratic. In this paper, we give an example illustrating that Witsenhausen's conclusion holds for our framework where a communication channel is present. We provide numerical results showing that, for a large range of the signal to noise ratio at the channel, nonlinear strategies strongly out-perform the best linear strategies

关键词： Counting circuits Communication channels Signal to noise ratio Communication system control Costs Distributed control Noise measurement Performance evaluation Gaussian channels Delay

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3DG: A Framework for Using Generative AI for Handling Sparse Learner Performance Data From Intelligent Tutoring systems

3DG: A Framework for Using Generative AI for Handling Sparse...

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2024 Joint of International Conference on Learning Analytics and Knowledge Workshops, LAK-WS 2024

作者： Zhang, Liang Lin, Jionghao Borchers, Conrad Cao, Meng Hu, Xiangen Institute for Intelligent Systems University of Memphis MemphisTN38152 United States Department of Electrical and Computer Engineering University of Memphis MemphisTN38152 United States Human-Computer Interaction Institute Carnegie Mellon University PittsburghPA15213 United States Department of Psychology University of Memphis MemphisTN38152 United States

Learning performance data (e.g., quiz scores and attempts) is significant for understanding learner engagement and knowledge mastery level. However, the learning performance data collected from Intelligent Tutoring systems (ITSs) often suffers from sparsity, impacting the accuracy of learner modeling and knowledge assessments. To address this, we introduce the 3DG framework (3-Dimensional tensor for Densification and Generation), a novel approach combining tensor factorization with advanced generative models, including Generative Adversarial Network (GAN) and Generative Pre-trained Transformer (GPT), for enhanced data imputation and augmentation. The framework operates by first representing the data as a three-dimensional tensor, capturing dimensions of learners, questions, and attempts. It then densifies the data through tensor factorization and augments it using Generative AI models, tailored to individual learning patterns identified via clustering. Applied to data from an AutoTutor lesson by the Center for the Study of Adult Literacy (CSAL), the 3DG framework effectively generated scalable, personalized simulations of learning performance. Comparative analysis revealed GAN’s superior reliability over GPT-4 in this context, underscoring its potential in addressing data sparsity challenges in ITSs and contributing to the advancement of personalized educational technology. © 2024 CEUR-WS. All rights reserved.

关键词： Generative adversarial networks

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Opportunistic communications for networked controlled systems of autonomous vehicles

Opportunistic communications for networked controlled system...

引用

MILCOM, Military Communications Conference

作者： Hua Chen Pedram Hovareshti John S. Baras Institute of Systems Research and Department of Electrical and Computer Engineering University of Maryland College Park MD USA

Situational awareness requires maintaining a reasonable level of communication connectivity in networks of autonomous vehicles. It is difficult to overcome deep fading from time-varying wireless channels in a dynamic and resource constrained environment. Moreover, other system constraints such as the energy consumption and total operation time make the design of communication protocols for such systems more challenging. In this paper, we consider the problem of efficient communications between a group of autonomous vehicles with energy consumption and total operation time constraints in an adversarial environment. We show that the policy of continuously attempting to communicate reliably over the course of the mission may lead to considerable system degradation. We propose an adaptive algorithm to make communication attempts opportunistically, based on the qualities of the wireless channels as the vehicles move throughout the terrain. We compare the proposed algorithm with a non-opportunistic algorithm in which the vehicles blindly attempt to communicate regularly throughout the course of the mission. We show that the proposed algorithm significantly improves the system performance, both in terms of operation time when the agents transmit only situational information and data throughput when additional data transmission is necessary.

关键词： Vehicles Wireless communication Wireless sensor networks Trajectory Mobile robots Energy consumption Servers

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A low-power acoustic periodicity detector chip for voice and engine detection

A low-power acoustic periodicity detector chip for voice and...

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Midwest Symposium on Circuits and systems (MWSCAS)

作者： H. Abdalla T. Horiuchi Department of Electrical and Computer Engineering Institute for Systems Research University of Maryland College Park MD USA

The detection of voices or the rumble of engines is a desirable function in many different devices from toys to smart homes to military applications. Typical approaches involving frequency-domain computation are quite computationally intensive and require a significant power and computational budget. In an effort to construct a very low-power detector capable of acting as a wake-up signal for other systems, we have designed a simple, low-power (1.5 /spl mu/W) analog VLSI circuit that detects periodicity in the time-domain envelope of the acoustic signal. The circuit was fabricated in a commercially 1.5 /spl mu/m available CMOS process.

关键词： Acoustic signal detection Engines Military computing Envelope detectors Circuits Acoustic devices Smart homes Signal design Very large scale integration Time domain analysis

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