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University of Alberta
(42 results)-
Whitepapers
Query Processing in Object-Oriented Database Systems
November 7, 2007, 12:00am PST
One of the basic functionalities of Database Management Systems (DBMSs) is to be able to process declarative user queries. The first generation of object-oriented DBMSs did not provide declarative...
Provided by University of Alberta
-
White Papers
Visualizing Web Navigation Data With Polygon Graphs
January 1, 2010, 12:00am PST
As the volume of digitally accessible information grows, there is increasing pressure on the development of data visualization methods to enable humans to interpret that data. This paper provides...
Provided by University of Alberta
-
White Papers
Realtime Visualization of Monocular Data for 3D Reconstruction
January 21, 2008, 12:00am PST
Methods for reconstructing photorealistic 3D graphics models from images or video are appealing applications of computer vision. Such methods rely on good input image data, but the lack of user...
Provided by University of Alberta
-
White Papers
To Bundle Or Not To Bundle: On The Profitability Of Multi-Item Auctions
February 1, 2009, 12:00am PST
Bundling, a strategy of selling two or more distinct products as a package for a single price, is widely practiced in today's marketplace. The paper investigates under what conditions it is more...
Provided by University of Alberta
-
White Papers
Generalized Agency Problems
June 1, 2009, 12:00am PDT
Agency problems in economics virtually always entail self-interested agency exhibiting "Insufficient" loyalty to principal. Social psychology also has a literature, mainly derived from work by...
Provided by University of Alberta
-
Whitepapers
Simulating Service-Oriented Systems: A Survey and the Services-Aware Simulation Framework
April 16, 2012, 12:00am PDT
The service-oriented architecture style supports desirable qualities, including distributed, loosely-coupled systems spanning organizational boundaries. Such systems and their configurations are...
Provided by University of Alberta
-
Whitepapers
Autonomic Configuration Adaptation Based on Simulation-Generated State-Transition Models
June 1, 2011, 12:00am PDT
Configuration management is a complex task, even for experienced system administrators, which makes self-managing systems a particularly desirable solution. This paper describes a novel...
Provided by University of Alberta
-
Whitepapers
Maintaining and Evolving Service Level Agreements: Motivation and Case Study
July 24, 2011, 12:00am PDT
Inter-organization service-oriented compositions are governed by Service Level Agreements (SLAs). While the software is maintained and evolved in response to changing business requirements or...
Provided by University of Alberta
-
Whitepapers
Automated State-Space Exploration for Configuration Management of Service-Oriented Applications
July 6, 2011, 12:00am PDT
Configuration management is a complex task, even for experienced system administrators, which makes self-managing systems a desirable solution. Self-management implies the need for a model based...
Provided by University of Alberta
-
Whitepapers
Code Convention Adherence in Evolving Software
September 19, 2011, 12:00am PDT
Maintainability is a desired property of software, and a variety of metrics have been proposed for measuring it, focusing on different notions of complexity and code readability. Many practices...
Provided by University of Alberta
-
Whitepapers
Moving Text Analysis Tools to the Cloud
October 2, 2011, 12:00am PDT
Text analysis is an important computational task, as unstructured data including text abound and can potentially provide interesting information and knowledge in a variety of areas. In the...
Provided by University of Alberta
-
White Papers
Reviving a Tangible Interface Affording 3D Spatial Interaction
January 1, 2011, 12:00am PST
Tangible interfaces offer natural means of human computer interaction and have already been shown to simplify existing computerized applications and offer solutions for tasks that were considered...
Provided by University of Alberta
-
White Papers
Cooperative Decision-Making in Decentralized Multiple-Robot Systems: The Best-of-N Problem
January 23, 2009, 12:00am PST
Multiple-Robot Systems (MRS) that is decentrally organized has many benefits over centralized systems. Decentralized systems are less affected by computational and communicative bottlenecks, and...
Provided by University of Alberta
-
White Papers
A Probability Model for Lifetime of Wireless Sensor Networks
September 28, 2007, 12:00am PDT
Considering a wireless sensor network whose nodes are distributed randomly over a given area, a probability model for the network lifetime is provided. Using this model and assuming that packet...
Provided by University of Alberta
-
White Papers
Optimizing XML Compression
May 28, 2009, 12:00am PDT
The eXtensible Markup Language (XML) provides a powerful and flexible means of encoding and exchanging data. As it turns out, its main advantage as an encoding format (namely, its requirement that...
Provided by University of Alberta
-
White Papers
Disjoint LDPC Coding for Gaussian Broadcast Channels
June 15, 2009, 12:00am PDT
Low-Density Parity-Check (LDPC) codes have been used for communication over a two-user Gaussian broadcast channel. It has been shown in the literature that the optimal decoding of such system...
Provided by University of Alberta
-
White Papers
Local And Global Merchant Networks: Accounting Across Space And Time
July 1, 2010, 12:00am PDT
The authors' paper has three main objectives. First, they build upon the earlier research of the Guide du Commerce (1773) and French trade to examine business networks emanating from...
Provided by University of Alberta
-
White Papers
A Simple Construction of 16-QAM Codewords With Low PMEPR for OFDM Signals
July 28, 2010, 12:00am PDT
Golay sequences have been introduced to construct 16-QAM (Quaternary Amplitude Modulation) code for the Orthogonal Frequency Division Multiplexing (OFDM), reducing the Peak-to-Mean Envelope Power...
Provided by University of Alberta
-
White Papers
Testing Real-Time Properties of Embedded Systems
May 14, 2008, 12:00am PDT
The authors introduce an executable model for verifying real-time properties of embedded systems programmed under PicOS, which is a tiny operating system for small-footprint wireless devices. One...
Provided by University of Alberta
-
White Papers
Opportunistic Relaying in Two-Way Networks
July 7, 2010, 12:00am PDT
This paper is on opportunistic relaying for networks with two-way communications. For a network with two users that exchange information with each other through multiple amplify-and-forward...
Provided by University of Alberta
-
White Papers
BEM-Based Estimation for Time-Varying Channels and Training Design in Two-Way Relay Networks
July 2, 2010, 12:00am PDT
In this paper, channel estimation for Two-Way Relay Networks (TWRNs) over time-varying channels is investigated. The authors consider the Amplify-and-Forward (AF) relaying scheme and adopt the...
Provided by University of Alberta
-
White Papers
Feedback Delay Effect on Dual-Hop MIMO AF Relaying With Antenna Selection
July 19, 2010, 12:00am PDT
In this paper, the effect of feedback delays on the performance of multiple-input multiple-output antenna amplify-and-forward relay networks with the best transmit/receive antenna pair selection...
Provided by University of Alberta
-
White Papers
Generalized Singular Value Decomposition for Coordinated Beamforming in MIMO Systems
July 19, 2010, 12:00am PDT
In this paper, the authors examine the use of Generalized Singular Value Decomposition (GSVD) for coordinated beamforming in MIMO systems. GSVD facilitates joint decomposition of a class of...
Provided by University of Alberta
-
White Papers
Superimposed Pilot Based Joint CFO and Channel Estimation for CP-OFDM Modulated Two-Way Relay Networks
July 22, 2010, 12:00am PDT
This paper proposes a superimposed training strategy to estimate the individual frequency and channel parameters in an Amplify-and-Forward (AF) Two-Way Relay Network (TWRN). Two efficient...
Provided by University of Alberta
-
White Papers
Transmit Antenna Selection Strategies for Cooperative MIMO AF Relay Networks
July 19, 2010, 12:00am PDT
In this paper, an analytical framework is developed for the performance analysis of three Transmit Antenna Selection (TAS) strategies for dual-hop multiple-input multiple-output Channel-Assisted...
Provided by University of Alberta
-
White Papers
Multi-Hop Relay Networks With Multiple-Antenna Equipped Source and Destination
June 1, 2010, 12:00am PDT
The performance of a multi-hop amplify-and-forward relay network is analyzed. The source and destination terminals are equipped with multiple-antennas and the relays with single-antennas. The...
Provided by University of Alberta
-
White Papers
Superimposed Pilots Aided Joint CFO and Channel Estimation for ZP-OFDM Modulated Two-Way Relay Networks
May 28, 2010, 12:00am PDT
Existing works on joint Carrier Frequency Offset (CFO) and channel estimation in Two-Way Relay Networks (TWRN) only deal with the convoluted channel parameters and the mixed CFO values. In this...
Provided by University of Alberta
-
White Papers
Resource Allocation and QoS Provisioning for Wireless Relay Networks
April 29, 2009, 12:00am PDT
Emerging broadband wireless applications in most wireless networks require increasingly high throughput and more stringent Quality-of-Service (QoS) requirements. In this respect, multiple-antenna...
Provided by University of Alberta
-
White Papers
Aggregation Convergecast Scheduling in Wireless Sensor Networks
January 1, 2011, 12:00am PST
The authors consider the problem of aggregation convergecast scheduling in wireless sensor networks. Aggregation convergecast differs from regular convergecast in that it accommodates transmission...
Provided by University of Alberta
-
White Papers
Structure Learning of Causal Bayesian Networks: A Survey
January 9, 2011, 12:00am PST
Causality is a fundamental concept in reasoning. The effectiveness of many reasoning tasks depends on the understanding of the underlying cause-effect relationships. Therefore, the notion of...
Provided by University of Alberta
-
White Papers
Histogram and Other Aggregate Queries in Wireless Sensor Networks
February 1, 2011, 12:00am PST
Wireless Sensor Networks (WSNs) are typically used to collect values of some phenomena in a monitored area. In many applications, users are interested in summaries of the observed data, e.g., a...
Provided by University of Alberta
-
White Papers
Supporting Wireless Application Development Via Virtual Execution
October 18, 2008, 12:00am PDT
Although simple wireless devices built from low-end components are quite popular these days, one seldom hears about serious wireless networks within this framework. While it is not a big challenge...
Provided by University of Alberta
-
White Papers
Optimal Multiuser Zero Forcing With Per-Antenna Power Constraints for Network MIMO Coordination
February 12, 2011, 12:00am PST
The authors consider a multicell Multiple-Input Multiple-Output (MIMO) coordinated downlink transmission, also known as network MIMO, under per-antenna power constraints. They investigate a simple...
Provided by University of Alberta
-
White Papers
Optimal Traffic-Oblivious Energy-Aware Routing for Multihop Wireless Networks
January 1, 2011, 12:00am PST
Energy efficiency is an important issue in multi-hop wireless networks with energy concerns. Usually it is achieved with accurate knowledge of the traffic pattern and/or the current network...
Provided by University of Alberta
-
White Papers
On Reliable Transmission of Data Over Simple Wireless Channels
January 4, 2009, 12:00am PST
Standard protocols for reliable data transmission over unreliable channels are based on various Automatic Repeat reQuest (ARQ) schemes, whereby the sending node receives feedback from the receiver...
Provided by University of Alberta
-
White Papers
BGP Routing Scalability: Reflectors Vs. Route Servers
January 1, 2008, 12:00am PST
Autonomous systems need to be connected using BGP servers. To reduce the complexity of connecting these systems together, researchers have suggested that route servers or routing databases be...
Provided by University of Alberta
-
White Papers
Use Case Redocumentation From GUI Event Traces
April 30, 2008, 12:00am PDT
Use case re-documentation is an important maintenance task. The implemented functionality of an application may not reflect original use cases. This discrepancy can create problems in downstream...
Provided by University of Alberta
-
White Papers
The Framework Use Problem: A Preliminary Study With GUI Frameworks
January 1, 2008, 12:00am PST
This paper reports the study of the problems associated with the use of two GUI frameworks, MFC and Swing. They argue that learning a framework is a design recovery process; the process is further...
Provided by University of Alberta
-
White Papers
Using Support Vector Machines to Learn How to Compile a Method
October 1, 2010, 12:00am PDT
The question addressed in this paper is what subset of code transformations should be attempted for a given method in a Just-in-Time compilation environment. The solution proposed is to use a...
Provided by University of Alberta
-
White Papers
Efficient Resource Allocation for OFDMA Multicast Systems With Fairness Consideration
October 10, 2008, 12:00am PDT
The problem of how to optimally allocate available resources (e.g., bandwidth and power) in OFDM-based multicast wireless systems is important. Taking the maximization of system throughput as the...
Provided by University of Alberta
-
Whitepapers
Moving Text Analysis Tools to the Cloud
October 2, 2011, 12:00am PDT
Text analysis is an important computational task, as unstructured data including text abound and can potentially provide interesting information and knowledge in a variety of areas. In the...
Provided by University of Alberta
-
Whitepapers
Code Convention Adherence in Evolving Software
September 19, 2011, 12:00am PDT
Maintainability is a desired property of software, and a variety of metrics have been proposed for measuring it, focusing on different notions of complexity and code readability. Many practices...
Provided by University of Alberta
-
Whitepapers
Automated State-Space Exploration for Configuration Management of Service-Oriented Applications
July 6, 2011, 12:00am PDT
Configuration management is a complex task, even for experienced system administrators, which makes self-managing systems a desirable solution. Self-management implies the need for a model based...
Provided by University of Alberta
-
Whitepapers
Maintaining and Evolving Service Level Agreements: Motivation and Case Study
July 24, 2011, 12:00am PDT
Inter-organization service-oriented compositions are governed by Service Level Agreements (SLAs). While the software is maintained and evolved in response to changing business requirements or...
Provided by University of Alberta
-
Whitepapers
Autonomic Configuration Adaptation Based on Simulation-Generated State-Transition Models
June 1, 2011, 12:00am PDT
Configuration management is a complex task, even for experienced system administrators, which makes self-managing systems a particularly desirable solution. This paper describes a novel...
Provided by University of Alberta
-
Whitepapers
Simulating Service-Oriented Systems: A Survey and the Services-Aware Simulation Framework
April 16, 2012, 12:00am PDT
The service-oriented architecture style supports desirable qualities, including distributed, loosely-coupled systems spanning organizational boundaries. Such systems and their configurations are...
Provided by University of Alberta
-
Whitepapers
Centralized and Distributed Power Allocation in Multi-User Wireless Relay Networks
July 25, 2012, 12:00am PDT
Optimal power allocation for multi-user amplify-and-forward wireless relay networks in which multiple source-destination pairs are assisted by a set of relays is investigated. Two relay power...
Provided by University of Alberta
-
White Papers
Predicting Object-Oriented Software Quality: A Case Study
November 18, 2009, 12:00am PST
Software quality lags far behind the quality of any other engineered product that humans create, and yet software systems are essential to the modern world. Software engineers have long proposed...
Provided by University of Alberta
-
White Papers
Efficient Resource Allocation for OFDMA Multicast Systems With Fairness Consideration
October 10, 2008, 12:00am PDT
The problem of how to optimally allocate available resources (e.g., bandwidth and power) in OFDM-based multicast wireless systems is important. Taking the maximization of system throughput as the...
Provided by University of Alberta
-
White Papers
Using Support Vector Machines to Learn How to Compile a Method
October 1, 2010, 12:00am PDT
The question addressed in this paper is what subset of code transformations should be attempted for a given method in a Just-in-Time compilation environment. The solution proposed is to use a...
Provided by University of Alberta
-
White Papers
On Reliable Transmission of Data Over Simple Wireless Channels
January 4, 2009, 12:00am PST
Standard protocols for reliable data transmission over unreliable channels are based on various Automatic Repeat reQuest (ARQ) schemes, whereby the sending node receives feedback from the receiver...
Provided by University of Alberta
-
White Papers
Optimal Traffic-Oblivious Energy-Aware Routing for Multihop Wireless Networks
January 1, 2011, 12:00am PST
Energy efficiency is an important issue in multi-hop wireless networks with energy concerns. Usually it is achieved with accurate knowledge of the traffic pattern and/or the current network...
Provided by University of Alberta
-
White Papers
Optimal Multiuser Zero Forcing With Per-Antenna Power Constraints for Network MIMO Coordination
February 12, 2011, 12:00am PST
The authors consider a multicell Multiple-Input Multiple-Output (MIMO) coordinated downlink transmission, also known as network MIMO, under per-antenna power constraints. They investigate a simple...
Provided by University of Alberta
-
White Papers
Supporting Wireless Application Development Via Virtual Execution
October 18, 2008, 12:00am PDT
Although simple wireless devices built from low-end components are quite popular these days, one seldom hears about serious wireless networks within this framework. While it is not a big challenge...
Provided by University of Alberta
-
White Papers
Histogram and Other Aggregate Queries in Wireless Sensor Networks
February 1, 2011, 12:00am PST
Wireless Sensor Networks (WSNs) are typically used to collect values of some phenomena in a monitored area. In many applications, users are interested in summaries of the observed data, e.g., a...
Provided by University of Alberta
-
White Papers
Structure Learning of Causal Bayesian Networks: A Survey
January 9, 2011, 12:00am PST
Causality is a fundamental concept in reasoning. The effectiveness of many reasoning tasks depends on the understanding of the underlying cause-effect relationships. Therefore, the notion of...
Provided by University of Alberta
-
White Papers
Aggregation Convergecast Scheduling in Wireless Sensor Networks
January 1, 2011, 12:00am PST
The authors consider the problem of aggregation convergecast scheduling in wireless sensor networks. Aggregation convergecast differs from regular convergecast in that it accommodates transmission...
Provided by University of Alberta
-
White Papers
Resource Allocation and QoS Provisioning for Wireless Relay Networks
April 29, 2009, 12:00am PDT
Emerging broadband wireless applications in most wireless networks require increasingly high throughput and more stringent Quality-of-Service (QoS) requirements. In this respect, multiple-antenna...
Provided by University of Alberta
-
White Papers
Superimposed Pilots Aided Joint CFO and Channel Estimation for ZP-OFDM Modulated Two-Way Relay Networks
May 28, 2010, 12:00am PDT
Existing works on joint Carrier Frequency Offset (CFO) and channel estimation in Two-Way Relay Networks (TWRN) only deal with the convoluted channel parameters and the mixed CFO values. In this...
Provided by University of Alberta
-
White Papers
Multi-Hop Relay Networks With Multiple-Antenna Equipped Source and Destination
June 1, 2010, 12:00am PDT
The performance of a multi-hop amplify-and-forward relay network is analyzed. The source and destination terminals are equipped with multiple-antennas and the relays with single-antennas. The...
Provided by University of Alberta
-
White Papers
Transmit Antenna Selection Strategies for Cooperative MIMO AF Relay Networks
July 19, 2010, 12:00am PDT
In this paper, an analytical framework is developed for the performance analysis of three Transmit Antenna Selection (TAS) strategies for dual-hop multiple-input multiple-output Channel-Assisted...
Provided by University of Alberta
-
White Papers
Superimposed Pilot Based Joint CFO and Channel Estimation for CP-OFDM Modulated Two-Way Relay Networks
July 22, 2010, 12:00am PDT
This paper proposes a superimposed training strategy to estimate the individual frequency and channel parameters in an Amplify-and-Forward (AF) Two-Way Relay Network (TWRN). Two efficient...
Provided by University of Alberta
-
White Papers
Generalized Singular Value Decomposition for Coordinated Beamforming in MIMO Systems
July 19, 2010, 12:00am PDT
In this paper, the authors examine the use of Generalized Singular Value Decomposition (GSVD) for coordinated beamforming in MIMO systems. GSVD facilitates joint decomposition of a class of...
Provided by University of Alberta
-
White Papers
Feedback Delay Effect on Dual-Hop MIMO AF Relaying With Antenna Selection
July 19, 2010, 12:00am PDT
In this paper, the effect of feedback delays on the performance of multiple-input multiple-output antenna amplify-and-forward relay networks with the best transmit/receive antenna pair selection...
Provided by University of Alberta
-
White Papers
BEM-Based Estimation for Time-Varying Channels and Training Design in Two-Way Relay Networks
July 2, 2010, 12:00am PDT
In this paper, channel estimation for Two-Way Relay Networks (TWRNs) over time-varying channels is investigated. The authors consider the Amplify-and-Forward (AF) relaying scheme and adopt the...
Provided by University of Alberta
-
White Papers
Opportunistic Relaying in Two-Way Networks
July 7, 2010, 12:00am PDT
This paper is on opportunistic relaying for networks with two-way communications. For a network with two users that exchange information with each other through multiple amplify-and-forward...
Provided by University of Alberta
-
White Papers
Testing Real-Time Properties of Embedded Systems
May 14, 2008, 12:00am PDT
The authors introduce an executable model for verifying real-time properties of embedded systems programmed under PicOS, which is a tiny operating system for small-footprint wireless devices. One...
Provided by University of Alberta
-
White Papers
A Simple Construction of 16-QAM Codewords With Low PMEPR for OFDM Signals
July 28, 2010, 12:00am PDT
Golay sequences have been introduced to construct 16-QAM (Quaternary Amplitude Modulation) code for the Orthogonal Frequency Division Multiplexing (OFDM), reducing the Peak-to-Mean Envelope Power...
Provided by University of Alberta
-
White Papers
Local And Global Merchant Networks: Accounting Across Space And Time
July 1, 2010, 12:00am PDT
The authors' paper has three main objectives. First, they build upon the earlier research of the Guide du Commerce (1773) and French trade to examine business networks emanating from...
Provided by University of Alberta
-
White Papers
Disjoint LDPC Coding for Gaussian Broadcast Channels
June 15, 2009, 12:00am PDT
Low-Density Parity-Check (LDPC) codes have been used for communication over a two-user Gaussian broadcast channel. It has been shown in the literature that the optimal decoding of such system...
Provided by University of Alberta
-
White Papers
Optimizing XML Compression
May 28, 2009, 12:00am PDT
The eXtensible Markup Language (XML) provides a powerful and flexible means of encoding and exchanging data. As it turns out, its main advantage as an encoding format (namely, its requirement that...
Provided by University of Alberta
-
White Papers
A Probability Model for Lifetime of Wireless Sensor Networks
September 28, 2007, 12:00am PDT
Considering a wireless sensor network whose nodes are distributed randomly over a given area, a probability model for the network lifetime is provided. Using this model and assuming that packet...
Provided by University of Alberta
-
Whitepapers
Query Processing in Object-Oriented Database Systems
November 7, 2007, 12:00am PST
One of the basic functionalities of Database Management Systems (DBMSs) is to be able to process declarative user queries. The first generation of object-oriented DBMSs did not provide declarative...
Provided by University of Alberta
-
White Papers
Cooperative Decision-Making in Decentralized Multiple-Robot Systems: The Best-of-N Problem
January 23, 2009, 12:00am PST
Multiple-Robot Systems (MRS) that is decentrally organized has many benefits over centralized systems. Decentralized systems are less affected by computational and communicative bottlenecks, and...
Provided by University of Alberta
-
White Papers
Reviving a Tangible Interface Affording 3D Spatial Interaction
January 1, 2011, 12:00am PST
Tangible interfaces offer natural means of human computer interaction and have already been shown to simplify existing computerized applications and offer solutions for tasks that were considered...
Provided by University of Alberta
-
White Papers
Generalized Agency Problems
June 1, 2009, 12:00am PDT
Agency problems in economics virtually always entail self-interested agency exhibiting "Insufficient" loyalty to principal. Social psychology also has a literature, mainly derived from work by...
Provided by University of Alberta
-
White Papers
To Bundle Or Not To Bundle: On The Profitability Of Multi-Item Auctions
February 1, 2009, 12:00am PST
Bundling, a strategy of selling two or more distinct products as a package for a single price, is widely practiced in today's marketplace. The paper investigates under what conditions it is more...
Provided by University of Alberta
-
White Papers
Realtime Visualization of Monocular Data for 3D Reconstruction
January 21, 2008, 12:00am PST
Methods for reconstructing photorealistic 3D graphics models from images or video are appealing applications of computer vision. Such methods rely on good input image data, but the lack of user...
Provided by University of Alberta
-
White Papers
Visualizing Web Navigation Data With Polygon Graphs
January 1, 2010, 12:00am PST
As the volume of digitally accessible information grows, there is increasing pressure on the development of data visualization methods to enable humans to interpret that data. This paper provides...
Provided by University of Alberta
-
White Papers
The Framework Use Problem: A Preliminary Study With GUI Frameworks
January 1, 2008, 12:00am PST
This paper reports the study of the problems associated with the use of two GUI frameworks, MFC and Swing. They argue that learning a framework is a design recovery process; the process is further...
Provided by University of Alberta
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