George Mason University

Displaying 1-40 of 118 results

  • White Papers // May 2014

    Constructing and Analyzing Criminal Networks

    Analysis of criminal social graph structures can enable them to gain valuable insights into how these communities are organized. Such as, how large scale and centralized these criminal communities are currently? While these types of analysis have been completed in the past, the authors wanted to explore how to construct...

    Provided By George Mason University

  • White Papers // Apr 2014

    On Time-Sensitive Revenue Management and Energy Scheduling in Green Data Centers

    In this paper, the authors design an analytically and experimentally better online energy and job scheduling algorithm with the objective of maximizing net pro t for a service provider in green data centers. They first study the previously known algorithms and conclude that these online algorithms have provable poor performance...

    Provided By George Mason University

  • White Papers // Jan 2014

    Accessing Big Data in the Cloud Using Mobile Devices

    The amount of data generated annually over the internet has exceeded the zeta-byte levels. Processing data with such high volume far exceeds the computational capabilities of today's datacenters and computers, giving rise to the term big data. The amount of data acquired, stored, and processed annually over the Internet has...

    Provided By George Mason University

  • White Papers // Nov 2013

    The Anatomy of Mapreduce Jobs, Scheduling, and Performance Challenges

    Hadoop is a leading open source tool that supports the realization of the big data revolution and is based on Google's MapReduce pioneering work in the field of ultra large amount of data storage and processing. Instead of relying on expensive proprietary hardware, Hadoop clusters typically consist of hundreds or...

    Provided By George Mason University

  • White Papers // Sep 2013

    Reducing Power in Hybrid MRAM Cache Through Iterative Low Voltage Writes

    As technology scales down, the static leakage power of SRAM based cache becomes a more critical source of dissipated power, particularly for large last level cache where leakage power is high. The emerging non-volatile Spin Transfer Torque (STT-RAM) is a nominee to substitute SRAM due to low leakage power. However,...

    Provided By George Mason University

  • White Papers // Jun 2013

    OCTANE: Open Car Testbed and Network Experiments Bringing Cyber-Physical Security Research to Researchers and Students

    Security research and teaching using cyber-physical systems (e.g., automotive networks) is challenging because of the need to replicate the interactions between the hardware components and the control software of the systems. These interactions are challenging to replicate because of the dynamic inputs in real-world environments that cause various interactions of...

    Provided By George Mason University

  • White Papers // Apr 2013

    IOCheck: A Framework to Enhance the Security of I/O Devices at Runtime

    Securing hardware is the foundation for implementing a secure system. However, securing hardware devices remains an open research problem. In this paper, the authors present IOCheck, a framework to enhance the security of I/O devices at runtime. It leverages System Management Mode (SMM) to quickly check the integrity of I/O...

    Provided By George Mason University

  • White Papers // Apr 2013

    MOTAG: Moving Target Defense Against Internet Denial of Service Attacks

    Distributed Denial of Service (DDoS) attacks still pose a significant threat to critical infrastructure and Internet services alike. In this paper, the authors propose MOTAG, a moving target defense mechanism that secures service access for authenticated clients against flooding DDoS attacks. MOTAG employs a group of dynamic packet indirection proxies...

    Provided By George Mason University

  • White Papers // Jan 2013

    Out-of-the-Box Monitoring of VM-Based High-Interaction Honeypots

    Honeypot has been an invaluable tool for the detection and analysis of network-based attacks by either human intruders or automated malware in the wild. The insights obtained by deploying honeypots, especially high-interaction ones, largely rely on the monitoring capability on the honeypots. In practice, based on the location of sensors,...

    Provided By George Mason University

  • White Papers // Jan 2013

    Billing Attacks on SIP-Based VoIP Systems

    Billing is fundamental to any commercial VoIP services and it has direct impact on each individual VoIP subscriber. One of the most basic requirements of any VoIP billing function is that it must be reliable and trustworthy. From the VoIP subscriber's perspective, VoIP billing should only charge them for the...

    Provided By George Mason University

  • White Papers // Dec 2012

    Concurrent Object-Oriented Development with Behavioral Design Patterns

    The development of concurrent applications is challenging because of the complexity of concurrent designs and the hazards of concurrent programming. Architectural modeling using the Unified Modeling Language (UML) can support the development process, but the problem of mapping the model to a concurrent implementation remains. This paper addresses this problem...

    Provided By George Mason University

  • White Papers // Dec 2012

    Queuing Network Models to Predict the Completion Time of the Map Phase of MapReduce Jobs

    Big data processing is generally defined as a situation when the size of the data itself becomes part of the computational problem. This paper has made divide-and-conquer type algorithms implemented in clusters of multi-core CPUs in Hadoop/MapReduce environments an important data processing tool for many organizations. Jobs of various kinds,...

    Provided By George Mason University

  • White Papers // Oct 2012

    Comprehensive Evaluation of High-Speed and Medium-Speed Implementations of Five SHA-3 Finalists Using Xilinx and Altera FPGAs

    In this paper, the authors present a comprehensive comparison of all Round 3 SHA-3 candidates and the current standard SHA-2 from the point of view of hardware performance in modern FPGAs. Each algorithm is implemented using multiple architectures based on the concepts of iteration, folding, unrolling, pipelining, and circuit replication....

    Provided By George Mason University

  • White Papers // Sep 2012

    Geoprocessing on the Amazon Cloud Computing Platform - AWS

    With the continuously increment of the available amount of spatial data sets, science, industry and administration require web-based geo-information concerning storage, availability and processing. The development of Spatial Data Infrastructures (SDIs) brings about the Web-based sharing of large volumes of distributed geospatial data and computational resources. A powerful, dependable and...

    Provided By George Mason University

  • White Papers // Jul 2012

    Security Margin Evaluation of SHA-3 Contest Finalists Through SAT-Based Attacks (Extension)

    In 2007, the U.S. National Institute of Standards and Technology (NIST) announced a public contest aiming at the selection of a new standard for a cryptographic hash function. In this paper, the security margin of five SHA-3 finalists is evaluated with an assumption that attacks launched on finalists should be...

    Provided By George Mason University

  • White Papers // Jun 2012

    The Virtual Apprentice

    Over the past couple of decades, virtual humans have been attracting more and more attention. Many applications including, video games, movies, and various training and tutoring systems have benefited from work in this area. While the visual quality of virtual agents has improved dramatically, their intelligence and socialization still needs...

    Provided By George Mason University

  • White Papers // Apr 2012

    NetGator: Malware Detection Using Program Interactive Challenges

    Internet-borne threats have evolved from easy to detect denial of service attacks to zero-day exploits used for targeted exfiltration of data. Current intrusion detection systems cannot always keep-up with zero-day attacks and it is often the case that valuable data have already been communicated to an external party over an...

    Provided By George Mason University

  • White Papers // Mar 2012

    The MEERKATS Cloud Security Architecture

    MEERKATS is a novel architecture for cloud environments that elevates continuous system evolution and change as first-rate design principles. The authors' goal is to enable an environment for cloud services that constantly changes along several dimensions, toward creating an unpredictable target for an adversary. This unpredictability will both impede the...

    Provided By George Mason University

  • White Papers // Mar 2012

    Throughput Limits in Spectrum Sensing Cognitive Radio Networks Using Point Processes

    Spectrum sensing in cognitive wireless networks is important for Secondary nodes to avoid interference with the Primaries. In this paper, considering a spectrum sensing framework, the authors develop models for bounding interference levels from Secondary network to the Primary nodes. First, they assume that both networks are distributed according to...

    Provided By George Mason University

  • White Papers // Mar 2012

    Crowd Distribution and Location Preference

    Most crowd simulators focus on navigation and agents flow. In this paper, the authors present another perspective which concentrates on the overall distribution of virtual agents and uses psychological preferences for choosing goal locations. Both observation and published theory indicate that most people prefer to maintain their personal space as...

    Provided By George Mason University

  • White Papers // Jan 2012

    NSDMiner: Automated Discovery of Network Service Dependencies

    Enterprise networks today host a wide variety of network services, which often depend on each other to provide and support network-based services and applications. Understanding such dependencies is essential for maintaining the well-being of an enterprise network and its applications, particularly in the presence of network attacks and failures. In...

    Provided By George Mason University

  • White Papers // Nov 2011

    Chrome Extensions: Threat Analysis and Countermeasures

    The widely popular browser extensions now become one of the most commonly used malware attack vectors. The Google chrome browser, which implements the principles of least privileges and privilege separation by design, offers a strong security mechanism to protect malicious websites from damaging the whole browser system via extensions. In...

    Provided By George Mason University

  • White Papers // Nov 2011

    Groestl Tweaks and Their Effect on FPGA Results

    The authors have performed the first order analysis of the influence of the Round 3 tweaks in Groestl on the performance of this algorithm in FPGAs. Both Groestl-0 and the revised Groestl have been fully implemented in VHDL using two alternative architectures: quasi-pipelined and parallel. The results indicate that the...

    Provided By George Mason University

  • White Papers // Sep 2011

    Capacity Bounds in Random Wireless Networks

    The authors consider a receiving node, located at the origin, and a Poisson point process that models the locations of the desired transmitter as well as the interferers. Interference is known to be non-Gaussian in this scenario. The capacity bounds for additive non-Gaussian channels depend on not only the power...

    Provided By George Mason University

  • White Papers // Sep 2011

    An Empirical Study on Variants of TCP Over AODV Routing Protocol in MANET

    The cardinal concept of TCP development was to carry data within the network where network congestion plays a vital role to cause packet loss. On the other hand, there are several other reasons to lose packets in Mobile Ad Hoc Networks due to fading, interfaces, multi-path routing, malicious node, and...

    Provided By George Mason University

  • White Papers // Aug 2011

    Populations with Purpose

    There are currently a number of animation researchers that focus on simulating virtual crowds, but few are attempting to simulate virtual populations. Virtual crowd simulations tend to depict a large number of agents walking from one location to another as realistically as possible. The virtual humans in these crowds lack...

    Provided By George Mason University

  • White Papers // Jul 2011

    Network Security Risks Associated With IaaS in a Shared Environment

    Cloud computing offers extraordinary benefits and efficiencies to organizations. Organizations can now purchase computing resources on an as-needed basis without the overhead and costs of managing their own IT resources. However, with those efficiencies come many hurdles that must be overcome. Understanding what is going on behind the opaque wall...

    Provided By George Mason University

  • White Papers // Jun 2011

    NetGator: Malware Detection Through Program Interactive Proofs

    Exfiltration of data using internet-borne attacks has become a credible threat for organization and enterprises. History has shown that crafted targeted attacks and zero-day malware are capable of penetrating even the most sophisticated defenses. To make matters worse, intrusion detection systems that perform analysis of network traffic are dependent on...

    Provided By George Mason University

  • White Papers // Jun 2011

    Assessing Home Internet Users' Demand for Security: Will They Pay ISPs?

    One strategy for improving cyber security would be for Internet Service Providers (ISPs) to take a more active role in curtailing criminal behavior over the Internet. However, few ISPs today are offering robust security to their customers. They largely contend that home Internet users are unwilling to pay for improvements...

    Provided By George Mason University

  • White Papers // May 2011

    Guided Exploration of the Architectural Solution Space in the Face of Uncertainty

    A system's early architectural decisions impact its properties (e.g., scalability, dependability) as well as stakeholder concerns (e.g., cost, time to delivery). Choices made early on are both difficult and costly to change, and thus it is paramount that the engineer gets them "Right". This leads to a paradox, as in...

    Provided By George Mason University

  • White Papers // Apr 2011

    CapMan: Capability-Based Defense Against Multi-Path Denial of Service (DoS) Attacks in MANET

    This paper presents a capability-based security mechanism called CapMan. The authors' approach is designed to prevent Denial-of-Service (DoS) attacks on wireless communications, particularly against multi-path communication in Mobile Adhoc NETworks (MANETs). CapMan offers a mechanism for a per flow, distributed bandwidth control by all the participating nodes along multiple communication...

    Provided By George Mason University

  • White Papers // Apr 2011

    GPU-Euler: Sequence Assembly Using GPGPU

    Advances in sequencing technologies have revolutionized the field of genomics by providing cost effective and high throughput solutions. In this paper, the authors develop a parallel sequence assembler implemented on general purpose Graphic Processor Units (GPUs). The authors' work was largely motivated by a growing need in the genomic community...

    Provided By George Mason University

  • White Papers // Mar 2011

    Which Should We Try First? Ranking Information Resources Through Query Classification

    Users seeking information in distributed environments of large numbers of disparate information resources are often burdened with the task of repeating their queries for each and every resource. Invariably, some of the searched resources are more productive (yield more useful documents) than others, and it would be undoubtedly useful to...

    Provided By George Mason University

  • White Papers // Feb 2011

    Hidden Markov Process Based Dynamic Spectrum Access for Cognitive Radio

    Cognitive radio is an emerging technology for sensing and dynamic access of spectrum in mobile radio environments. It aims at dynamically allocating unused bandwidth among secondary users without causing harmful interference to the primary users. This approach, which has clear economical benefits, has recently attracted significant research effort. In this...

    Provided By George Mason University

  • White Papers // Feb 2011

    Resilient Traffic Engineering in a Transit-Edge Separated Internet Routing

    The significant growth of Internet traffic and increase of routing tables require solutions to address Internet scalability and resiliency. A possible direction is to move away from the flat legacy Internet routing to hierarchical routing, separating edge networks from transit networks. In this paper, the authors study the extended traffic...

    Provided By George Mason University

  • White Papers // Jan 2011

    Contract As Convention

    Contract theory is a curiously neglected field. While the efficiency of contract law rules has received much attention, the same cannot be said of the more basic question why contracts should be enforced. The reliance and autonomy explanations which contract theorists most frequently offer are moreover unpersuasive. Reliance theories would...

    Provided By George Mason University

  • White Papers // Jan 2011

    Enforcement Architecture and Implementation Model for Group-Centric Information Sharing

    A fundamental requirement for Secure Information Sharing (SIS) is that protection needs to extend to clients. Trusted Computing Technology provides a hardware root of trust through the Trusted Platform Module. This paper presents a super-distribution based enforcement architecture and implementation model for the group-centric SIS problem which is concerned with...

    Provided By George Mason University

  • White Papers // Jan 2011

    The Sound Of One Hand Clapping: The 2010 Merger Guidelines And The Challenge Of Judicial Adoption

    There is ample justification for the consensus view that the Horizontal Merger Guidelines have proven one of antitrust law's great successes in the grounding of antitrust doctrine within economic learning. The foundation of the Guidelines' success has been its widespread adoption by federal courts, which have embraced its rigorous underlying...

    Provided By George Mason University

  • White Papers // Jan 2011

    Does Antitrust Enforcement In High Tech Markets Benefit Consumers? Stock Price Evidence From FTC V. Intel

    Antitrust enforcement efforts in the United States and abroad have been ramped up in high-tech industries, rekindling stale and largely unresolved debates concerning the appropriate role of antitrust enforcement in high-tech markets. Like the previous enforcement actions against Microsoft, and likely enforcement efforts in the future against similarly situated business...

    Provided By George Mason University

  • White Papers // Jan 2011

    RandSys: Thwarting Code Injection Attacks With System Service Interface Randomization

    Code injection attacks are a top threat to today's Internet. With zero-day attacks on the rise, randomization techniques have been introduced to diversify software and operation systems of networked hosts so that attacks that succeed on one process or one host cannot succeed on others. Two most notable system-wide randomization...

    Provided By George Mason University

  • White Papers // Jun 2010

    On the Role of Architectural Styles in Improving the Adaptation Support of Middleware Platforms

    Modern middleware platforms provide the applications deployed on top of them with facilities for their adaptation. However, the level of adaptation support provided by the state-of-the-art middleware solutions is often limited to dynamically loading and off-loading of software components. Therefore, it is left to the application developers to handle the...

    Provided By George Mason University

  • White Papers // May 2010

    Context-Driven Optimization of Mobile Service-Oriented Systems for Improving Their Resilience

    Mobile software systems are characterized by their highly dynamic and unpredictable execution context. Such systems are permeating a number of domains where the systems operate in constantly changing conditions. The authors refer to such systems as Situated Software Systems. These systems are often deployed in mission-critical settings with stringent reliability...

    Provided By George Mason University

  • White Papers // May 2009

    Digging Digg : Comment Mining, Popularity Prediction, and Social Network Analysis

    Using comment information available from Digg the authors define a co-participation network between users. They focus on the analysis of this implicit network, and study the behavioral characteristics of users. Using an entropy measure, the authors infer that users at Digg are not highly focused and participate across a wide...

    Provided By George Mason University

  • White Papers // Nov 2010

    GeoMason: GeoSpatial Support for MASON

    MASON is a free, open-source Java-based discrete event multi-agent simulation toolkit that has been used to model network intrusions, unmanned aerial vehicles, nomadic migrations, and farmer/herder conflicts, among others. Many multi-agent models use georeferenced data which represent such things as road networks, rivers, vegetation coverage, population, and topology. However, MASON...

    Provided By George Mason University

  • White Papers // Jan 2011

    Life After Self-Healing: Assessing Post-Repair Program Behavior

    One promising technique for defending software systems against vulnerabilities involve the use of self-healing. Such efforts, however, carry a great deal of risk because they largely bypass the cycle of human-driven patching and testing used to vet both vendor and internally developed patches. In particular, it is difficult to predict...

    Provided By George Mason University

  • White Papers // Mar 2011

    Which Should We Try First? Ranking Information Resources Through Query Classification

    Users seeking information in distributed environments of large numbers of disparate information resources are often burdened with the task of repeating their queries for each and every resource. Invariably, some of the searched resources are more productive (yield more useful documents) than others, and it would be undoubtedly useful to...

    Provided By George Mason University

  • White Papers // Dec 2010

    Predicting Network Response Times Using Social Information

    Social networks and discussion boards have become a significant outlet where people communicate and express their opinion freely. Although the social networks themselves are usually well-provisioned, the participating users frequently point to external links to substantiate their discussions. Unfortunately, the sudden heavy traffic load imposed on the external, linked web...

    Provided By George Mason University

  • White Papers // Jun 2011

    NetGator: Malware Detection Through Program Interactive Proofs

    Exfiltration of data using internet-borne attacks has become a credible threat for organization and enterprises. History has shown that crafted targeted attacks and zero-day malware are capable of penetrating even the most sophisticated defenses. To make matters worse, intrusion detection systems that perform analysis of network traffic are dependent on...

    Provided By George Mason University

  • White Papers // May 2011

    Guided Exploration of the Architectural Solution Space in the Face of Uncertainty

    A system's early architectural decisions impact its properties (e.g., scalability, dependability) as well as stakeholder concerns (e.g., cost, time to delivery). Choices made early on are both difficult and costly to change, and thus it is paramount that the engineer gets them "Right". This leads to a paradox, as in...

    Provided By George Mason University

  • White Papers // Apr 2011

    GPU-Euler: Sequence Assembly Using GPGPU

    Advances in sequencing technologies have revolutionized the field of genomics by providing cost effective and high throughput solutions. In this paper, the authors develop a parallel sequence assembler implemented on general purpose Graphic Processor Units (GPUs). The authors' work was largely motivated by a growing need in the genomic community...

    Provided By George Mason University

  • White Papers // Jun 2009

    Analytical Techniques for Performance Analysis of Multi-Copy Routing Schemes in Delay Tolerant Networks

    Delay Tolerant Networks (DTNs) are a class of networks that experience frequent and long-duration partitions due to sparse distribution of nodes. The topological impairments experienced within a DTN pose unique challenges for designing effective DTN multicasting protocols. In this paper, the authors examine multi-copy routing schemes for DTNs. They provide...

    Provided By George Mason University

  • White Papers // Jul 2009

    VirusMeter: Preventing Your Cellphone From Spies

    Due to the rapid advancement of mobile communication technology, mobile devices nowadays can support a variety of data services that are not traditionally available. With the growing popularity of mobile devices in the last few years, attacks targeting they are also surging. Existing mobile malware detection techniques, which are often...

    Provided By George Mason University

  • White Papers // Sep 2010

    Artificial Malware Immunization Based on Dynamically Assigned Sense of Self

    Computer malwares (e.g., botnets, rootkits and spyware) are one of the most serious threats to all computers and networks. Most malwares conduct their malicious actions via hijacking the control flow of the infected system or program. Therefore, it is critically important to protect the mission critical systems from malicious control...

    Provided By George Mason University

  • White Papers // Oct 2009

    Towards a Framework for Group-Centric Secure Collaboration

    The concept of groups is a natural aspect of most collaboration scenarios. Group-centric Secure Information Sharing models (g-SIS) have been recently proposed in which users and objects are brought together to promote sharing and collaboration. Users may join, leave and re-join and objects may be added, removed and re-added. Furthermore,...

    Provided By George Mason University

  • White Papers // Jun 2009

    A Hybrid Enforcement Model for Group-Centric Secure Information Sharing

    Group-centric Secure Information Sharing (g-SIS) is motivated by the need to dynamically share information amongst a set of authorized users for a specific purpose. Authorized group users may read and contribute new objects to the group. An important usability objective in g-SIS is to allow users to access group objects...

    Provided By George Mason University

  • White Papers // Jun 2010

    Encryption-Based Policy Enforcement for Cloud Storage

    Nowadays, users are more and more exploiting external storage and connectivity for sharing and disseminating user-generated content. To this aim, they can benefit of the services offered by Internet companies, which however assume that the service provider is entitled to access the resources. To overcome this limitation, the authors present...

    Provided By George Mason University

  • White Papers // Apr 2009

    Piecewise Planar City 3D Modeling From Street View Panoramic Sequences

    City environments often lack textured areas, contain repetitive structures, strong lighting changes and therefore are very difficult for standard 3D modeling pipelines. The authors present a novel unified framework for creating 3D city models which overcomes these difficulties by exploiting image segmentation cues as well as presence of dominant scene...

    Provided By George Mason University

  • White Papers // Jul 2011

    Network Security Risks Associated With IaaS in a Shared Environment

    Cloud computing offers extraordinary benefits and efficiencies to organizations. Organizations can now purchase computing resources on an as-needed basis without the overhead and costs of managing their own IT resources. However, with those efficiencies come many hurdles that must be overcome. Understanding what is going on behind the opaque wall...

    Provided By George Mason University

  • White Papers // Jul 2010

    Providing Mobile Users' Anonymity in Hybrid Networks

    The authors present a novel hybrid communication protocol that guarantees mobile users' k-anonymity against a wide-range of adversaries by exploiting the capability of handheld devices to connect to both WiFi and cellular networks. Unlike existing anonymity schemes, they consider all parties that can intercept communications between the mobile user and...

    Provided By George Mason University

  • White Papers // Sep 2010

    Unfolding The Allegory Behind Market Communication And Social Error And Correction

    One aspect of the present paper is to draw out the Adam Smith in Friedrich Hayek. The author suggests that common economic talk of market communication, market error and correction, and policy error and correction invokes a spectatorial being and appeals to our sympathy with such being. Behind such common...

    Provided By George Mason University

  • White Papers // May 2009

    Advanced Vulnerability Analysis and Intrusion Detection Through Predictive Attack Graphs

    Network security tools generally lack sufficient context for maintaining a well informed and proactive defense posture. Vulnerabilities are usually assessed in isolation, without considering how they contribute to overall attack risk. Similarly, intrusion alarms are logged as isolated events, with limited correlation capabilities. Security professionals are often overwhelmed by constant...

    Provided By George Mason University

  • White Papers // May 2009

    Simulation-Based Command and Control Applications in a Service-Oriented, Cloud Computing Environment

    Modeling and Simulation (M&S) technologies have matured suitably to provide real time tactical utility to warfighting Command and Control (C2) computer system users, but C2 systems adoption of M&S in their native applications has been slow for design, acceptance, computing and procurement reasons. While extensive work has been done with...

    Provided By George Mason University

  • White Papers // Jul 2009

    Dartmouth Internet Security Testbed (DIST): Building a Campus-Wide Wireless Testbed

    This paper describes the experiences in deploying a campus-wide wireless security testbed. The testbed gives one the capability to monitor security-related aspects of the 802.11 MAC layer in over 200 diverse campus locations. The paper describes both the technical and the social challenges of designing, building, and deploying such a...

    Provided By George Mason University

  • White Papers // Jul 2009

    Spam Detection Using Clustering, Random Forests, and Active Learning

    This paper describes work in progress. The research is focused on efficient construction of effective models for spam detection. Clustering messages allows for efficient labeling of a representative sample of messages for learning a spam detection model using a Random Forest for classification and active learning for refining the classification...

    Provided By George Mason University

  • White Papers // Oct 2009

    Visualization of Earth Science Data Using Google Earth

    With Google Earth being widely used by the general public and professionals, Virtual Globes are revolutionizing the way in which scientists conduct their research and the general public uses geospatial-related data and information. NASA Goddard Earth Science Data and Information Service Center (GES DISC) developed a service-oriented online scientific data...

    Provided By George Mason University

  • White Papers // Jul 2009

    The Heisenberg Measuring Uncertainty in Lightweight Virtualization Testbeds

    The need for large-scale experimentation testbeds involving several hundred, or even thousands, of nodes is undeniable. Testbeds including Emulab, and Deter are heavily used for both research and application testing. To scale even further and shed some of the limitations that the relative small number of physical nodes impose, researchers...

    Provided By George Mason University

  • White Papers // May 2010

    Universal Multi-Factor Authentication Using Graphical Passwords

    With AO, companies are able to turn into a more industrialized model in a centralized low-cost country for the service. With this, funds can be released easily and they therefore help pay for investments in larger transformation programs. In the case of AO, companies can ask their suppliers to manage...

    Provided By George Mason University

  • White Papers // Sep 2009

    Understanding Cloud Computing: Experimentation and Capacity Planning

    Cloud computing is a relatively new concept but has its roots in many not-so-new technologies. It is a modality of computing characterized by on demand availability of resources in a dynamic and scalable fashion. This paper discusses in detail the concept of cloud computing, its advantages such as pay as...

    Provided By George Mason University

  • White Papers // Jul 2009

    A2M: Access-Assured Mobile Desktop Computing

    Continued improvements in network bandwidth, cost, and ubiquitous access are enabling service providers to host desktop computing environments to address the complexity, cost, and mobility limitations of today's personal computing infrastructure. However, distributed denial of service attacks can deny use of such services to users. The authors present A2M, a...

    Provided By George Mason University

  • White Papers // Feb 2010

    Security Policy Cognizant Module Composition

    Component-based software development and deployment is based on developing individual software modules that are composed on an as needed basis. Such modules expose the computations they provide and their dependencies on providing these computations - that results in a well known requires-provides specifications for modules. This paper provides a framework...

    Provided By George Mason University

  • White Papers // Sep 2011

    An Empirical Study on Variants of TCP Over AODV Routing Protocol in MANET

    The cardinal concept of TCP development was to carry data within the network where network congestion plays a vital role to cause packet loss. On the other hand, there are several other reasons to lose packets in Mobile Ad Hoc Networks due to fading, interfaces, multi-path routing, malicious node, and...

    Provided By George Mason University

  • White Papers // Apr 2011

    CapMan: Capability-Based Defense Against Multi-Path Denial of Service (DoS) Attacks in MANET

    This paper presents a capability-based security mechanism called CapMan. The authors' approach is designed to prevent Denial-of-Service (DoS) attacks on wireless communications, particularly against multi-path communication in Mobile Adhoc NETworks (MANETs). CapMan offers a mechanism for a per flow, distributed bandwidth control by all the participating nodes along multiple communication...

    Provided By George Mason University

  • White Papers // Sep 2011

    Capacity Bounds in Random Wireless Networks

    The authors consider a receiving node, located at the origin, and a Poisson point process that models the locations of the desired transmitter as well as the interferers. Interference is known to be non-Gaussian in this scenario. The capacity bounds for additive non-Gaussian channels depend on not only the power...

    Provided By George Mason University

  • White Papers // Aug 2009

    Performance of a Cognitive Radio Network With Tolerable Service Degradation

    The authors analyze the performance of a cognitive radio wireless network, where secondary users opportunistically share the radio spectrum with primary users through spectrum sensing and may cause service degradation to the primary users due to unreliable spectrum sensing. When a secondary user occupying a channel detects the presence of...

    Provided By George Mason University

  • White Papers // May 2009

    Spectrum Sensing With SS-AOA Measurements and Directional Transmissions

    For successful Opportunistic Spectrum Access (OSA) using spatial information, accurate localization is a crucial first step. In this paper, the authors consider a group of unlicensed (secondary) nodes that collaboratively localize a target licensed (primary) transmitter. They propose an optimal hybrid localization scheme based on Signal Strength (SS) and Angle-Of-Arrival...

    Provided By George Mason University

  • White Papers // Feb 2011

    Hidden Markov Process Based Dynamic Spectrum Access for Cognitive Radio

    Cognitive radio is an emerging technology for sensing and dynamic access of spectrum in mobile radio environments. It aims at dynamically allocating unused bandwidth among secondary users without causing harmful interference to the primary users. This approach, which has clear economical benefits, has recently attracted significant research effort. In this...

    Provided By George Mason University

  • White Papers // May 2010

    Exploiting Multichannel Diversity in Cognitive Radio Networks

    Cognitive radios hold tremendous promise for increasing spectral efficiency in wireless systems. In cognitive radio networks, secondary users equipped with frequency-agile cognitive radios communicate with one another via spectrum that is not being used by the primary, licensed users of the spectrum. The authors consider a multichannel cognitive radio network...

    Provided By George Mason University

  • White Papers // Feb 2010

    Cooperative Communication With Regenerative Relays for Cognitive Radio Networks

    Cognitive radios hold tremendous promise for increasing spectral efficiency in wireless systems. In cognitive radio networks, secondary users equipped with frequency-agile cognitive radios communicate with one another via spectrum that is not being used by the primary, licensed users of the spectrum. The authors consider a cooperative communication scenario in...

    Provided By George Mason University

  • White Papers // Oct 2009

    Exploiting Multiuser Diversity for Spectrum Sensing in Cognitive Radio Networks

    The authors consider wireless system consisting of secondary users equipped with cognitive radios that attempt to access radio spectrum that is not being used by the primary licensed users. To avoid causing harmful interference to the primary users, the secondary users perform spectrum sensing to determine spectrum hole opportunities for...

    Provided By George Mason University

  • White Papers // Oct 2009

    Combining Cooperative Relaying With Spectrum Sensing in Cognitive Radio Networks

    In a network with dynamic spectrum access, secondary users equipped with frequency-agile cognitive radios communicate with one another via spectrum that is not being used by the primary, licensed users of the spectrum. The authors consider a scenario in which a secondary transmitter can communicate with a secondary receiver via...

    Provided By George Mason University