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International Conference and Workshop on computing and Communication (IEMCON)

作者： Khaldoon Alshouiliy Abhishek Shivanna Sujan Ray Ali AlGhamdi Dharma P Agrawal Center for Distributed and Mobile Computing EECS University of Cincinnati Cincinnati USA Department of Computer Science and Information Technology AlBaha University Al Agig Saudi Arabia

ISBN: (纸本)9781728125312

Nowadays, healthcare sector starts relying on the datasets that are collected by clinics or some organizations to help doctors in predicting and analyzing the patient's status in early stage. There are many dangerous diseases around the world that people suffer from them, but one of the most dangerous diseases is cancer. Recent research shows that about 12% US women over the course of their life, develop invasive breast cancer. Thus, in this case, the breast cancer (BC) is categorized as a dangerous type among all cancer types. This study focuses on BC by using a well-known dataset titled Breast Cancer Wisconsin (Diagnostic) Data Set. It has 32 attributes and 569 instances. Some of those attributes have missing values and others are not necessary for our work. So, we removed the ID column and any instance that has a missing value. Our aims in this research is analyzing BC dataset and understand its features. Then, we upload it to Microsoft Azure machine learning (AzureML) platform for building our model. We use two classes Decision Jungle and two Classes Decision machine learning algorithms to predicate whether the patient diagnose is Benign or Malignant. We assess the performance of each algorithms in terms of different measures like Accuracy, Precision, Recall, F1 and AUC. The results of our study in this paper show that the accuracy of Decision Jungle is approximately 97%. On the other hand, the accuracy of Decision tree is approximately 95%.

关键词： Breast cancer Machine learning algorithms Decision trees Machine learning Support vector machines Heating systems

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QoS-aware Node Selection Algorithm for Routing Protocols in VANETs

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Procedia Computer Science 2014年 40卷 66-73页

作者： Ahmad Mostafa Anna Maria Vegni Asitha Bandaranayake Dharma P. Agrawal Center for Distributed and Mobile Computing Department of Electrical Engineering and Computing Systems University of Cincinnati Cincinnati OH 45221 – 0030 USA Department of Engineering COMLAB Telecommunications Laboratory Roma Tre University 00146 Rome Italy

In this paper, we present a QoS-Aware node Selection Algorithm (QASA) for routing protocols to be suitable for a particular class of opportunistic networks, when applied to the Vehicular Ad hoc Networks. Our algorithm aims to select the next-hop vehicle to communicate with, by exploiting the “bridging approach” for message forwarding i.e. , vehicles on the east (west) select from west (east). The QoS metrics that are being optimized are the throughput in the network, and packets end-to-end delay. In order to provide the best network performance, the algorithm utilizes a probabilistic rebroadcasting scheme based on different network parameters including vehicle density, inter-vehicle distance, and the transmission range for the vehicles. Moreover, QASA utilizes a transmission range-based metric that can be changed as per application requirements, whether it is high throughput or minimum end-to-end delay. Simulation results show the effectiveness of our approach in terms of improved QoS metrics in different vehicular network scenarios.

关键词： VANETs Reliability Probability-based routing Quality-of-Service

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CAREFOR: Collision-Aware REliable FORwarding Technique for Vehicular Ad hoc Networks

CAREFOR: Collision-Aware REliable FORwarding Technique for V...

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International Conference on computing, Networking and Communications

作者： Anna Maria Vegni Ahmad Mostafa Dharma P. Agrawal Department of Applied Electronics University of Roma Tre Rome Italy School of Computing Sciences and Informatics Center for Distributed and Mobile Computing University of Cincinnati Cincinnati OH USA

ISBN: (纸本)9781467352871

This paper presents a new probabilistic-based re-broadcast scheme, providing a reliable and low-collision packet forwarding in a vehicular ad hoc network. In the proposed technique called Collision-Aware REliable FORwarding, each vehicle rebroadcasts a received information on the basis of physical parameters associated with a vehicular environment, i.e., the distance from the source, the density of neighbors, and the forward transmission range. The key idea is that a node implicitly evaluates the probability that there is another node which can be more successful in rebroadcasting, that means (i) the message will be transmitted as far as possible, and (ii) will have a low number of expected collisions. Unlike other existing probability assignment schemes, our technique attempts to accurately forecast the next-hop transmission, while keeping the computation cost very low.

关键词： accurately keeping possible

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Reliability tradeoffs for energy efficient wireless networks

Reliability tradeoffs for energy efficient wireless networks

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2012 International Conference on Selected Topics in mobile and Wireless Networking, ICOST 2012

作者： Oliveira, Talmai Greve, Fabíola Vegni, Anna Maria Agrawal, Dharma P. School of Computing Sciences and Informatics Center for Distributed and Mobile Computing University of Cincinnati United States Federal University of Bahia Brazil Department of Applied Electronics University of Roma Tre Rome Italy

ISBN: (纸本)9781467309370

A complex wireless deployment under realistic scenario is prone to failures and it becomes very hard to determine when to stop retransmitting a message in order to ensure proper delivery. In this paper, a simple effective link-attribute estimator is proposed that is capable of identifying the quality of communication between neighboring mobile devices while maintaining the scalability. By relying on our link-quality estimator, a maximum number of attempts is computed which (probabilistically) ensures the message delivery while maintaining energy-efficiency. Through appropriate adjustments, our estimator is capable of obtaining the bounds on the number of retransmission attempts required to increase the message delivery ratio. This enables wireless devices to establish a threshold on the number of transmission attempts, thereby avoiding those retransmissions that would only result in wasted energy. Such dynamic threshold helps enforce at least a minimum number of transmission. Simulations prove the effectiveness of our LQ estimator with respect to energy efficiency and message delivery reliability. Results indicate that an acceptable message delivery ratio can be maintained while increasing the overall energy efficiency. © 2012 IEEE.

关键词： Energy efficiency

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Reliability tradeoffs for energy efficient wireless networks

Reliability tradeoffs for energy efficient wireless networks

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International Conference on Selected Topics in mobile and Wireless Networking (iCOST)

作者： Talmai Oliveira Fabíola Greve Anna Maria Vegni Dharma P. Agrawal School of Computing Sciences and Informatics Center for Distributed and Mobile Computing University of Cincinnati USA Computer Science Department (DCC) Federal University of Bahia Brazil Department of Applied Electronics University of Roma Tre Rome Italy

关键词： Reliability Network topology Wireless networks Protocols Topology mobile handsets

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QoSHVCP: Hybrid Vehicular Communications Protocol with QoS prioritization for safety applications

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ISRN Communications and Networking 2012年第1期2012卷

作者： Mostafa, Ahmad Vegni, Anna Maria Oliveira, Talmai Little, Thomas D. C. Agrawal, Dharma P. Center for Distributed and Mobile Computing School of Computing Sciences and Informatics University of Cincinnati Cincinnati OH United States Department of Applied Electronics Roma Tre University Rome Italy Department of Electrical and Computer Engineering Boston University Boston MA United States

This paper introduces a hybrid communication paradigm for achieving seamless connectivity in Vehicular Ad hoc Networks (VANETs), wherein the connectivity is often affected by changes in the dynamic topology, vehicles' speed, as well as the traffic density. Our proposed technique named QoS-oriented Hybrid Vehicular Communications Protocol (QoSHVCP) exploits both existing network infrastructure through a Vehicle-to-Infrastructure (V2I), as well as a traditional Vehicle-to-Vehicle (V2V) connection that could satisfy Quality-of-Service requirements. QoSHVCP is based on a V2V-V2I protocol switching algorithm, executed in a distributed fashion by each vehicle and is based on the cost function for alternative paths each time it needs to transmit a message. We utilize time delay as a performance metric and present the delay propagation rates when vehicles are transmitting high priority messages via QoSHVCP. Simulation results indicate that simultaneous usage of preexisting network infrastructure along with intervehicular communication provide lower delays, while maintaining the level of user's performance. Our results show a great promise for their future use in VANETs. Copyright © 2012 Ahmad Mostafa et al.

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A V2X-based approach for reduction of delay propagation in vehicular Ad-Hoc networks

A V2X-based approach for reduction of delay propagation in v...

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2011 11th International Conference on ITS Telecommunications, ITST 2011

作者： Mostafa, Ahmad Vegni, Anna Maria Singoria, Rekha Oliveira, Talmai Little, Thomas D.C. Agrawal, Dharma P. School of Computing Sciences and Informatics Center for Distributed and Mobile Computing University of Cincinnati Cincinnati OH United States Department of Applied Electronics University of Roma Tre Rome Italy Department of Electrical and Computer Engineering Boston University Boston MA United States

ISBN: (纸本)9781612846712

In this paper we investigate the time delay propagation rates in a Vehicular Ad-Hoc Network, where vehicular connectivity is supported by both Vehicle-to-Vehicle (V2V) and Vehicle-to-Infrastructure (V2I) protocols. In our vision, seamless connectivity issues in a VANET with nearby network infrastructure, can be fixed by an opportunistic choice of a vehicular protocol between V2V and V2I. Such a decision is taken by each vehicle whenever it needs to transmit messages. Our technique called as Vehicle-to-X represents a handoff procedure between V2V and V2I, and vice versa, in order to keep vehicles connected independent of mobility issues and traffic scenarios. We investigate the time delay as a performance metric for protocol switching, and present the time propagation rates which occur when vehicles are transmitting warning messages, via V2V or V2I. Simulation results show how the simultaneous usage of pre-existing network infrastructure, together with inter-vehicular communications, provides low delays;while traditional opportunistic vehicular communications increases the transmission time delays and does not guarantee seamless connectivity to vehicles. © 2011 IEEE.

关键词： Vehicular ad hoc networks

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A V2X-based approach for reduction of delay propagation in vehicular Ad-Hoc networks

A V2X-based approach for reduction of delay propagation in v...

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International Conference on ITS Telecommunications (ITST)

作者： Ahmad Mostafa Anna Maria Vegni Rekha Singoria Talmai Oliveira Thomas D. C. Little Dharma P. Agrawal School of Computing Sciences and Informatics Center of Distributed and Mobile Computing University of Cincinnati Cincinnati OH USA Department of Applied Electronics University of Rome Tre Rome Italy Department of Electrical and Computer Engineering Boston University Boston MA USA

In this paper we investigate the time delay propagation rates in a Vehicular Ad-Hoc Network, where vehicular connectivity is supported by both Vehicle-to-Vehicle (V2V) and Vehicle-to-Infrastructure (V2I) protocols. In our vision, seamless connectivity issues in a VANET with nearby network infrastructure, can be fixed by an opportunistic choice of a vehicular protocol between V2V and V2I. Such a decision is taken by each vehicle whenever it needs to transmit messages. Our technique - called as Vehicle-to-X - represents a handoff procedure between V2V and V2I, and vice versa, in order to keep vehicles connected independent of mobility issues and traffic scenarios. We investigate the time delay as a performance metric for protocol switching, and present the time propagation rates which occur when vehicles are transmitting warning messages, via V2V or V2I. Simulation results show how the simultaneous usage of pre-existing network infrastructure, together with inter-vehicular communications, provides low delays; while traditional opportunistic vehicular communications increases the transmission time delays and does not guarantee seamless connectivity to vehicles.

关键词： Vehicles Delay effects Delay Protocols Road transportation Wireless networks Switches

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An identity-based authentication and key establishment scheme for multi-operator maintained wireless mesh networks

An identity-based authentication and key establishment schem...

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International Conference on mobile Adhoc and Sensor Systems

作者： He, Bing Agrawal, Dharma P. Center for Distributed and Mobile Computing Department of Computer Science University of Cincinnati Cincinnati OH 45221 United States

ISBN: (纸本)9781424474882

Wireless Mesh Networks (WMNs) offer broadband wireless Internet access with flexible and cost-effective deployment. Security is one of the key issues should be considered before WMNs get widespread use. Authentication and key establishment (AKE) schemes enable two entities to share common communication keys in an authentic way. In a WMN, a Mesh Client (MC) and the accessing Mesh Router (MR) need to need to authenticate each other before the secure connection could be set up between them. Due to mobility of MCs, a WMN needs to have efficient authentication and key establishment scheme to provide adequate security while meeting the Quality of Service (QoS) requirements, especially during clients handoff. Mesh routers (MRs) also need to authenticate each other before set up the wireless connection. In this paper, we propose a authentication and key establishment scheme for WMN based on the identity-based cryptography (IBC), which enables efficient key agreement and mutual authentication between network entities in a WMN. Through this distributed authentication key establishment scheme, network entities can authenticate each other and establish pairwise communication keys with substantially reduced communication overhead and authentication delay. ©2010 IEEE.

关键词： Authentication

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Exploring load balancing in heterogeneous networks by rate distribution

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International Journal of Autonomous and Adaptive Communications Systems 2010年第3期3卷 284-307页

作者： Haldar, Kuheli Louha Jun, Jung-Hyun Oliveira, Talmai Agrawal, Dharma P. Department of Computer Science Center for Distributed and Mobile Computing University of Cincinnati Cincinnati OH 45221-0030 United States

In a heterogeneous wireless network (HWN), traffic is distributed primarily by grouping and channelling identical traffic through a particular access point. In this paper, we introduce an effective traffic load balancing scheme for maximising expected throughput in HWNs. Two scenarios are explored. First, we model multiple APs of a HWN as a cascade of independent M/M/1 queues. The expected number of packets in the system is formulated as a convex optimisation problem and solved using a Lagrange multiplier. A recursive approach is used in distributing the traffic to different APs. Then, we model multiple APs as a union of multiple M/M/1 and M/D/1 queues. Here, we minimise the time spent by each job in the system. We use a solver to obtain optimal rate distribution among the networks. Through extensive simulations, we show that distributing the traffic optimally outperforms existing traditional methods of grouping and channelling similar kind of traffic. Copyright © 2010 Inderscience Enterprises Ltd.

关键词： Lagrange multipliers

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