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Georgia Institute of Technology
(322 results)-
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Practical Multi-Antenna Spatial Reuse in WLANs
July 24, 2010, 12:00am PDT
Smart antennas can improve spatial reuse in a wireless network through interference suppression. However, interference suppression requires support from clients in the form of channel estimation,...
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The Myth of Spatial Reuse With Directional Antennas in Indoor Wireless Networks
January 20, 2010, 12:00am PST
Interference among co-channel users is a fundamental problem in wireless networks, which prevents nearby links from operating concurrently. Directional antennas allow the radiation patterns of...
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A Framework for Characterizing the Wireless and Mobile Network Continuum
January 1, 2011, 12:00am PST
The vast majority of research in Wireless And Mobile (WAM) networking falls in the MANET (Mobile Ad Hoc NETwork) category, where end-to-end paths are the norm. More recently, research has focused...
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NBS: A Network-Bandwidth-Aware Streaming Version Switcher for Mobile Streaming Applications Under Fuzzy Logic Control
May 10, 2012, 12:00am PDT
Good quality of service for a video streaming application under time-varying network bandwidth capacity is often required in many real-world scenarios, e.g., streaming in a typical high-speed...
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Economical and Robust Provisioning of N-Tier Cloud Workloads: A Multi-Level Control Approach
March 15, 2011, 12:00am PDT
Resource provisioning for N-tier web applications in Clouds is non-trivial due to at least two reasons. First, there is an inherent optimization conflict between cost of resources and Service...
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Variations in Performance and Scalability When Migrating N-Tier Applications to Different Clouds
April 27, 2011, 12:00am PDT
The increasing popularity of computing clouds continues to drive both industry and research to provide answers to a large variety of new and challenging questions. The authors aim to answer some...
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A Petri Net Siphon Based Solution to Protocol-Level Service Composition Mismatches
November 4, 2009, 12:00am PST
Protocol-level mismatch is one of the most important problems in service composition. The commonly used reachability exploration method focuses on verifying deadlock-freeness. When this property...
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Whitepapers
SCT-MAC: A Scheduling Duty Cycle MAC Protocol for Cooperative Wireless Sensor Network
May 24, 2012, 12:00am PDT
Effective techniques for extending lifetime in multi-hop Wireless Sensor Networks (WSNs) include duty cycling and more recently introduced cooperative transmission range extension. However a...
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On the Modeling of Randomized Distributed Cooperation for Linear Multi-Hop Networks
May 24, 2012, 12:00am PDT
A one-dimensional cooperative network is modeled stochastically, such that the nodes are randomly placed according to a Bernoulli process. A discrete time quasi-stationary Markov chain model is...
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Queueing Models for the Performance of Multihop Routing in a Intermittently-Connected Mobile Network
May 24, 2012, 12:00am PDT
Consider an intermittently-connected mobile ad-hoc network with a single source/destination aided by n mobile relay nodes each of which has a finite storage buffer. In this paper, the authors...
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Analysis of Intra-Flow Interference in Opportunistic Large Array Transmission for Strip Networks
May 24, 2012, 12:00am PDT
The Opportunistic Large Array (OLA), a simple form of concurrent cooperative transmission that extends range, is known to provide fast and reliable broadcasting of a single packet on both disk-...
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Cooperative Transmission Range Doubling With IEEE 802.15.4
May 24, 2012, 12:00am PDT
In battery-driven multi-hop wireless sensor networks, the most highly burdened relay nodes, or bottleneck nodes, will die first. These deaths eventually partition the network and trap valuable...
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Exploiting Statistical Interference Models for Distributed Resource Allocation in Cognitive Femtocells
May 24, 2012, 12:00am PDT
The authors develop cognitive resource allocation scheme to mitigate co-tier and cross-tier interference in overlay femtocell networks. By exploiting statistical models for characterizing...
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Symbol Block Construction for Frequency Domain Equalization of Multi-H CPM
May 24, 2012, 12:00am PDT
This paper considers the construction of a symbol block to generate a cyclic multi-h Continuous Phase Modulated (CPM) signal so as to permit Frequency Domain Equalization (FDE) at the receiver....
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Throughput and Latency of Finite-Buffer Wireless Erasure Networks With Backpressure Routing
May 24, 2012, 12:00am PDT
The authors consider the problem of estimating throughput and average latency in wireless erasure networks with nodes having finite buffers. In these networks, packets are either lost due to link...
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Optimal Sequential Detection in Cognitive Radio Networks
March 12, 2012, 12:00am PDT
Cognitive Radio (CR) can successfully deal with the growing demand and the scarcity of the wireless spectrum. To increase the spectrum usage, CR technology allows secondary users to access...
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Optimal Distributed Estimation in Wireless Sensor Networks With Spatially Correlated Noise Sources
March 12, 2012, 12:00am PDT
A sensor network's motes observe the environment, make estimates based on observations with spatially correlated noise sources, and then send/relay these estimates to a Cluster-Head (CH). A novel...
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On Secure Communication with Constrained Randomization
February 24, 2012, 12:00am PST
In this paper, the authors investigate how constraints on the randomization in the encoding process affect the secrecy rates achievable over wiretap channels. In particular, they characterize the...
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Exploiting Partial Channel State Information for Secrecy Over Wireless Channels
October 22, 2012, 12:00am PDT
In this paper, the authors investigate the effect of partial channel state information on the achievable secure communication rates and secret-key generation rates over ergodic fading channels. In...
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Learning the Dependency Structure of Latent Factors
December 6, 2012, 12:00am PST
In this paper, the authors study latent factor models with dependency structure in the latent space. They propose a general learning framework which induces sparsity on the undirected graphical...
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Input/Output APIs and Data Organization for High Performance Scientific Computing
November 16, 2008, 12:00am PST
Scientific data formats like HDF-5 and NetCDF have given rise to rich tool chains for use by science end users. Performance issues with their direct use by petascale (and beyond) applications,...
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NEAT: Road Network Aware Trajectory Clustering
March 10, 2012, 12:00am PST
Mining trajectory data has been gaining significant interest in recent years. However, existing approaches to trajectory clustering are mainly based on density and Euclidean distance measures. The...
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Commodity Converged Fabrics for Global Address Spaces in Accelerator Clouds
May 13, 2012, 12:00am PDT
Hardware support for Global Address Spaces (GAS) has previously focused on providing efficient access across remote memories, typically using custom interconnects or high-level software layers....
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Evaluating the Need for Complexity in Energy-Aware Management for Cloud Platforms
May 29, 2012, 12:00am PDT
In order to curtail the continuous increase in power consumption of modern datacenters, researchers are responding with sophisticated energy-aware workload management methods. This increases the...
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Dynamic Compilation of Data-Parallel Kernels for Vector Processors
January 16, 2012, 12:00am PST
Modern processors enjoy augmented throughput and power efficiency through specialized functional units leveraged via instruction set extensions. These functional units accelerate performance for...
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Lynx: A Dynamic Instrumentation System for Data-Parallel Applications on GPGPU Architectures
January 31, 2012, 12:00am PST
As parallel execution platforms continue to proliferate, there is a growing need for real-time introspection tools to provide insight into platform behavior for performance debugging, correctness...
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Benchmarking Next Generation Hardware Platforms: An Experimental Approach
February 14, 2012, 12:00am PST
Heterogeneous multi-cores-platforms comprised of both general purpose and accelerator cores - are becoming increasingly common. Further, with processor designs in which there are many cores on a...
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Why Do Migrations Fail and What Can We Do About It?
September 13, 2011, 12:00am PDT
This paper investigates the main causes that make the application migration to Cloud complicated and error-prone through two case studies. The authors first discuss the typical configuration...
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Network Compression: Memory-Assisted Universal Coding of Sources with Correlated Parameters
October 7, 2012, 12:00am PDT
The existence of significant amount of correlation in the network traffic has stimulated the development of in-network traffic reduction techniques since end-to-end universal compression solutions...
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Characterizing and Mitigating Inter-Domain Policy Violations in Overlay Routes
January 1, 2013, 12:00am PST
The Internet is a complex structure arising from the interconnection of numerous Autonomous Systems (AS), each exercising its own administrative policies to reflect the commercial agreements...
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A Complete Femtocell Network Modeling and Development Platform
November 21, 2012, 12:00am PST
Femtocells have emerged as an alternative solution for operators to improve coverage and throughput in indoor environments. However, modeling and development platforms are still needed in order to...
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QoS Driven Energy-Efficient Design for Downlink OFDMA Networks
November 21, 2012, 12:00am PST
The ubiquitous applications of high-data-rate real-time wireless services have promptly boomed energy consumption in wireless networks. Therefore, energy-efficient design in wireless networks is...
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Joint EM Channel and Covariance Estimation with Sufficient-Statistic Chip Combining for a SIMO MC-CDMA Antijam System
March 13, 2008, 12:00am PDT
Joint iterative channel and covariance estimation with Sufficient-Statistics (SS)-based chip combining is studied for a MultiCarrier Code Division Multiple Access (MC-CDMA) system operating under...
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Energy-Efficient Strategies for Cooperative Communications in Wireless Sensor Networks
July 19, 2007, 12:00am PDT
An Opportunistic Large Array (OLA) is a group of simple, inexpensive relays or forwarding nodes that operate without any mutual coordination, but naturally fire together in response to energy...
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Efficient Monitoring of Untrusted Kernel-Mode Execution
December 1, 2010, 12:00am PST
Recent malware instances execute completely in the kernel as drivers; they do not contain any user-level malicious processes. This design evades the system call monitoring used by many software...
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Attribution of Malicious Behavior
October 12, 2010, 12:00am PDT
Internet-connected computer systems face ongoing software attacks. Existing defensive solutions, such as intrusion detection systems, rely on the ability to identify malicious software (malware)...
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Distributed Cloud Storage Services With FleCS Containers
March 20, 2011, 12:00am PDT
There are limits to the ability to migrate or deploy applications across geographically distributed/loosely coupled cloud resources, requiring substantial data movement and/or uniformly visible...
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Exploring the Design Space of Greedy Link Scheduling Algorithms for Wireless Multihop Networks
April 13, 2011, 12:00am PDT
It is known that using a Spatial TDMA (STDMA) access scheme can increase the capacity of a wireless network over CSMA/CD access scheme. Modern wireless devices are capable of transmitting at...
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Local Decisions and Optimal Distributed Detection in Mobile Wireless Sensor Networks
July 8, 2010, 12:00am PDT
A set of mobile wireless sensors observe the environment as they move about and make decisions based on their observations. They send/relay their decisions to a sensor, called the Cluster-Head...
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FaReS: Fair Resource Scheduling for VMM-Bypass InfiniBand Devices
February 18, 2010, 12:00am PST
In order to address the high performance I/O needs of HPC and enterprise applications, modern interconnection fabrics, such as InfiniBand and more recently, 10GigE, rely on network adapters with...
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Dynamic Classification of Program Memory Behaviors in CMPs
June 1, 2008, 12:00am PDT
Multi-core processors with shared L2 caches can suffer from performance degradations when co-scheduled programs contend for cache resources in a destructive manner. In this work, the authors...
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3D-Stacked Memory Architectures for Multi-Core Processors
June 1, 2008, 12:00am PDT
Three-dimensional integration enables stacking memory directly on top of a microprocessor, thereby significantly reducing wire delay between the two. Previous studies have examined the performance...
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Thermal Optimization in Multi-Granularity Multi-Core Floorplanning
January 1, 2009, 12:00am PST
Multi-core microarchitectures require a careful balance between many competing objectives to achieve the highest possible performance. Integrated Early Analysis is the consideration of all of...
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Criticality-Based Optimizations for Efficient Load Processing
February 1, 2009, 12:00am PST
Some instructions have more impact on processor performance than others. Identification of these critical instructions can be used to modify and improve instruction processing. Previous work has...
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Provable-Security Analysis of Authenticated Encryption in Kerberos
June 14, 2007, 12:00am PDT
Kerberos is a widely-deployed network authentication protocol that is being considered for standardization. Many works have analyzed its security, identifying flaws and often suggesting fixes,...
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Identity-Based Encryption With Efficient Revocation
October 30, 2008, 12:00am PDT
Identity-Based Encryption (IBE) is an exciting alternative to public-key encryption, as IBE eliminates the need for a Public Key Infrastructure (PKI). Any setting, PKI- or identity-based, must...
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On Notions of Security for Deterministic Encryption, and Efficient Constructions Without Random Oracles
February 17, 2009, 12:00am PST
The study of deterministic public-key encryption was initiated by Bellare et al. (CRYPTO '07), who provided the "Strongest Possible" notion of security for this primitive (called PRIV) and...
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Physical-Layer Security Over Correlated Erasure Channels
February 17, 2011, 12:00am PST
This paper explores the additional security obtained by noise at the physical layer in a wiretap channel model setting. Security enhancements at the physical layer have been proposed recently...
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A MAC Protocol for Delay-Bounded Applications in Wireless Sensor Networks
January 1, 2011, 12:00am PST
The problem of scheduling packet transmissions for data gathering in wireless sensor networks is studied in this paper. A scenario is considered where different sources contemporarily sense an...
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Wireless Underground Sensor Networks Using Commodity Terrestrial Motes
October 20, 2008, 12:00am PDT
Overall, the results of these experiments demonstrate that existing terrestrial wireless sensor network solutions have limited applicability for wireless underground sensor networks. Reliable...
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Federal, State, And Local Governments: Evaluating Their Separate Roles In US Growth
October 1, 2008, 12:00am PDT
The authors use US county level data (3,058 observations) from 1970 to 1998 to explore the relationship between economic growth and the extent of government employment at three levels: federal,...
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Tamper-Resistant, Application-Aware Blocking of Malicious Network Connections
July 16, 2008, 12:00am PDT
Application-level firewalls block traffic based on the process that is sending or receiving the network flow. They help detect bots, worms, and backdoors that send or receive malicious packets...
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Creating Efficient Execution Platforms With V(irtualized)Services
January 1, 2011, 12:00am PST
Virtualization is creating new opportunities for innovative uses of middleware technologies. In this paper, the authors present such opportunities for mobile or pervasive environments, where...
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DDT: Design and Evaluation of a Dynamic Program Analysis for Optimizing Data Structure Usage
September 8, 2009, 12:00am PDT
Data structures define how values being computed are stored and accessed within programs. By recognizing what data structures are being used in an application, tools can make applications more...
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HE-Tree: A Framework for Detecting Changes in Clustering Structure for Categorical Data Streams
February 10, 2009, 12:00am PST
Analyzing clustering structures in data streams can provide critical information for real-time decision making. Most research in this area has focused on clustering algorithms for numerical data...
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DHT-Based Range Query Processing for Web Service Discovery
May 29, 2009, 12:00am PDT
DHTs are scalable, self-organizing, and adaptive to underlying topology changes, thus being a promising infrastructure for realizing efficient Web service discovery. Range queries play an...
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Scalable and Reliable Location Services Through Decentralized Replication
April 20, 2009, 12:00am PDT
One of the critical challenges for service oriented computing systems is the capability to guarantee scalable and reliable service provision. This paper presents Reliable GeoGrid, a decentralized...
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A Survey of Multiplicative Perturbation for Privacy Preserving Data Mining
September 20, 2007, 12:00am PDT
The major challenge of data perturbation is to achieve the desired balance between the level of privacy guarantee and the level of data utility. Data privacy and data utility are commonly...
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Preserving Caller Anonymity in Voice-Over-IP Networks
February 24, 2008, 12:00am PST
Applications such as VoIP need to provide anonymity to clients while maintaining low latency to satisfy Quality of Service (QoS) requirements. Existing solutions for providing anonymity such as...
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A Utility-Aware Middleware Architecture for Decentralized Group Communication Applications
January 1, 2011, 12:00am PST
The success of Internet telephony services like Skype illustrates the feasibility of utilizing unstructured Peer-to-Peer (P2P) networks as an economical platform for supporting group communication...
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PeerCast: Churn-Resilient End System Multicast on Heterogeneous Overlay Networks
July 11, 2007, 12:00am PDT
The lack of wide deployment of IP multicast in the Internet has prompted researchers to propose end system multicast or application-level multicast as an alternate approach. However, end system...
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Improving Wireless Positioning With Look-Ahead Map-Matching
July 30, 2007, 12:00am PDT
Determining the location of mobile devices is a necessary system function for a growing number of Location Based Services (LBS). The most popular method for location determination is GPS, however...
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Development of Distance Measures for Process Mining, Discovery, and Integration
July 13, 2007, 12:00am PDT
Business processes continue to play an important role in today's service-oriented enterprise computing systems. Mining, discovering, and integrating process-oriented services has attracted growing...
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Security Architectures and Algorithms for Publish-Subscribe Network Services
January 1, 2011, 12:00am PST
A large number of emerging Internet applications requires information dissemination across different organizational boundaries, heterogeneous platforms, and a large, dynamic population of...
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Scaling Unstructured Peer-to-Peer Networks With Heterogeneity-Aware Topology and Routing
January 1, 2011, 12:00am PST
Peer-To-Peer (P2P) le sharing systems such as Gnutella have been widely acknowledged as the fastest growing Internet applications ever. The P2P model has many potential advantages including high...
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Agyaat: Providing Mutually Anonymous Services Over Structured P2P Networks
January 1, 2011, 12:00am PST
In the modern era of ubiquitous computing, privacy is one of the most critical user concerns. To prevent their privacy, users typically, try to remain anonymous to the service provider. This is...
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Hybrid Generative/Discriminative Learning for Automatic Image Annotation
August 17, 2010, 12:00am PDT
Automatic Image Annotation (AIA) raises tremendous challenges to machine learning as it requires modeling of data that are both ambiguous in input and output, e.g., images containing multiple...
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Combining Computational Analyses and Interactive Visualization to Enhance Information Retrieval
August 22, 2010, 12:00am PDT
Exploratory search and information-seeking support systems attempt to go beyond simple information retrieval and assist people with exploration, investigation, learning and understanding...
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3D Reconstruction of Underwater Structures
July 15, 2010, 12:00am PDT
Environmental change is a growing international concern, calling for the regular monitoring, studying and preserving of detailed information about the evolution of underwater ecosystems. For...
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Directional Associative Markov Network for 3-D Point Cloud Classification
June 20, 2008, 12:00am PDT
In this paper the authors address the problem of automated three dimensional point cloud interpretation. This problem is important for various tasks from environment modeling to obstacle avoidance...
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Performance Evaluation of Hadoop on Virtual Machines
December 8, 2009, 12:00am PST
MapReduce is a popular programming framework that is intended for automatical paralellization of computation in the cloud. MapReduce deals with data intensive applications; huge amount of data is...
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Adaptive Data Migration in Multi-Tiered Storage Based Cloud Environment
May 7, 2010, 12:00am PDT
Multi-tiered storage systems today are integrating Solid State Disks (SSD) on top of traditional rotational hard disks for performance enhancement due to the significant IO improvements in SSD...
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Study on Performance Management and Application Behavior in Virtualized Environment
December 24, 2009, 12:00am PST
Control theory has been utilized in recent years to manage the resources in virtualized environment for applications with time-varying resource demand. The systems under control, including the...
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Combining Quality of Service and Social Information for Ranking Services
August 21, 2009, 12:00am PDT
In service-oriented computing, multiple services often exist to perform similar functions. In these situations, it is essential to have good ways for qualitatively ranking the services. In this...
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Intelligent Management of Virtualized Resources for Database Systems in Cloud Environment
July 23, 2010, 12:00am PDT
In a cloud computing environment, resources are shared among different clients. Intelligently managing and allocating resources among various clients is important for system providers, whose...
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Mistral: Dynamically Managing Power, Performance, and Adaptation Cost in Cloud Infrastructures
January 5, 2010, 12:00am PST
Server consolidation based on virtualization is a key ingredient for improving power efficiency and resource utilization in cloud computing infrastructures. However, to provide satisfactory...
Provided by Georgia Institute of Technology
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Security Models and Requirements for Healthcare Application Clouds
May 7, 2010, 12:00am PDT
With the widespread use of Electronic Health Record (EHR), building a secure EHR sharing environment has attracted a lot of attention in both healthcare industry and academic community. Cloud...
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White Papers
Automated Staging Testing Framework for Amazon EC2 (Enhancing Elba in to EC2 With MySQL Cluster)
April 28, 2009, 12:00am PDT
Increasing complexity of large enterprise and distributed application systems makes the management of the system is an increasingly important and increasing expensive technical challenge. Staging...
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Performance and Availability Aware Regeneration for Cloud Based Multitier Applications
April 17, 2010, 12:00am PDT
Virtual machine technology enables agile system deployments in which software components can be cheaply moved, replicated, and allocated hardware resources in a controlled fashion. This paper...
Provided by Georgia Institute of Technology
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White Papers
Online Detection of Utility Cloud Anomalies Using Metric Distributions
December 1, 2009, 12:00am PST
The online detection of anomalies is a vital element of operations in data centers and in utility clouds like Amazon EC2. Given ever-increasing data center sizes coupled with the complexities of...
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