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University of Minho
(66 results)-
White Papers
From Spreadsheets to Relational Databases and Back
July 22, 2008, 12:00am PDT
This paper presents techniques and tools to transform spreadsheets into relational databases and back. A set of data refinement rules is introduced to map a tabular datatype into a relational...
Provided by University of Minho
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White Papers
Capi: Cloud Computing API
July 21, 2009, 12:00am PDT
Cloud Computing is an emerging business model to provide access to IT resources in a pay per use fashion. Those resources range from low-level virtual machines, passing by application platforms...
Provided by University of Minho
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White Papers
RFID and Wireless Sensing
March 30, 2009, 12:00am PDT
Off late, the demand of markets to use active transponders, is reaching a saturation point. The main reason is because these ones get its power from batteries, which must be periodically replaced...
Provided by University of Minho
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White Papers
Wireless Communications and Mobile Computing
September 2, 2009, 12:00am PDT
The main objective of this course is to provide the students with the competences required for understanding and using the communications component of an universal communications environment....
Provided by University of Minho
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White Papers
Discovery-Based Edit Assistance for Spreadsheets
June 25, 2009, 12:00am PDT
Spreadsheets can be viewed as a highly flexible end-users programming environment which enjoys wide-spread adoption. But spreadsheets lack many of the structured programming concepts of regular...
Provided by University of Minho
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White Papers
Improving QoS Guarantees Through Implicit AC
January 21, 2008, 12:00am PST
In multiservice networks, Admission Control (AC) is a convenient means of assuring high quality communications by safeguarding enough availability for customer traffic. This can be particularly...
Provided by University of Minho
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White Papers
Processing XML: A Rewriting System Approach
May 1, 2010, 12:00am PDT
Nowadays XML processing is performed using one of two approaches: using the SAX (Simple API for XML) or using the DOM (Document Object Model). While these two approaches are adequate for most...
Provided by University of Minho
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White Papers
Odour User Interface for Authentication: Possibility and Acceptance: Case Study
March 19, 2010, 12:00am PDT
Historically, some new technologies are faced with rejection or acceptance. So researchers developed TAM (Technology Acceptance Model). TAM depends upon the user perception of the easiness and...
Provided by University of Minho
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White Papers
Fiscal Policy And Asset Prices
September 3, 2010, 12:00am PDT
The authors assess the role played by fiscal policy in explaining the dynamics of asset markets. Using a panel of ten industrialized countries, they show that a positive fiscal shock has a...
Provided by University of Minho
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White Papers
Exchange Rates, Employment And Labour Market
July 7, 2010, 12:00am PDT
There is increasing evidence that the interaction between shocks and labour market institutions is crucial to understanding the dynamics of employment. In this paper, the authors show that the...
Provided by University of Minho
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White Papers
Collateralizable Wealth, Asset Returns, And Systemic Risk: International Evidence
April 1, 2010, 12:00am PDT
I assess the role of wealth and systemic risk in explaining future asset returns. The author shows that the residuals of the trend relationship among asset wealth and human wealth predict both...
Provided by University of Minho
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White Papers
Providing Cost-Effective QoS Monitoring in Multiservice Networks
April 16, 2009, 12:00am PDT
In multiservice networks, QoS monitoring needs to be carried out in a per-class basis so that each service class measuring requirements and behavior are met and sensed properly. Facing the...
Provided by University of Minho
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White Papers
The Contagion Effects Of Financial Crises On Stock Markets Of Developed Countries
December 3, 2007, 12:00am PST
This paper makes an innovative approach, since it applies a set of diversified tests, which have not been used on a joint basis until now, in order to study the contagion effects of financial...
Provided by University of Minho
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Whitepapers
Precoder Design for Physical Layer Multicasting
May 24, 2012, 12:00am PDT
This paper studies the design of linear precoders via instantaneous rate maximization over a K-user multicast channel, wherein multiple antennas are present at the transmitter as well as at all...
Provided by University of Minho
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Whitepapers
Collaboration in Social Network-Based Information Dissemination
May 24, 2012, 12:00am PDT
Connectivity and trust within social networks have been exploited to build applications on top of these networks, including information dissemination, Sybil defenses, and anonymous communication...
Provided by University of Minho
-
Whitepapers
Reduced-Latency SC Polar Decoder Architectures
May 24, 2012, 12:00am PDT
Polar codes have become one of the most favorable capacity achieving Error Correction Codes (ECC) along with their simple encoding method. However, among the very few prior Successive Cancellation...
Provided by University of Minho
-
Whitepapers
Database Security: A Historical Perspective
April 22, 2010, 12:00am PDT
The importance of security in database research has greatly increased over the years as most of critical functionality of the business and military enterprises became digitized. Database is an...
Provided by University of Minho
-
Whitepapers
Joint Back-Pressure Power Control and Interference Cancellation in Wireless Multi-Hop Networks
August 31, 2012, 12:00am PDT
Back-pressure routing and power control policies are well-appreciated for maximizing throughput in wireless multi-hop networks, where power control is used to manage interference in a way that...
Provided by University of Minho
-
Whitepapers
Motion Segmentation by SCC on the Hopkins 155 Database
September 9, 2009, 12:00am PDT
The authors apply the Spectral Curvature Clustering (SCC) algorithm to a benchmark database of 155 motion sequences, and show that it outperforms all other state-of-the-art methods. The average...
Provided by University of Minho
-
Whitepapers
Network-Compressive Coding for Wireless Sensors with Correlated Data
September 25, 2012, 12:00am PDT
A network-compressive transmission protocol is developed in which correlated sensor observations belonging to a finite alphabet are linearly combined as they traverse the network on their way to a...
Provided by University of Minho
-
Whitepapers
Lowcomplexity Post-Coded OFDM Communication System: Design and Performance Analysis
November 16, 2007, 12:00am PST
Orthogonal Frequency Division Multiplexing (OFDM) provides a viable solution to communicate over frequency selective fading channels. However, in the presence of frequency nulls in the channel...
Provided by University of Minho
-
Whitepapers
Design and Analysis of Post-Coded OFDM Systems
December 1, 2008, 12:00am PST
This paper discusses the design and analysis of Post Coded OFDM (PC-OFDM) systems. Coded or precoded OFDM systems are generally employed to overcome the symbol recovery problem in uncoded OFDM...
Provided by University of Minho
-
Whitepapers
Non-Redundant and Redundant Post Coding in OFDM Systems
November 16, 2007, 12:00am PST
Orthogonal Frequency Division Multiplexing (OFDM) provides a viable solution to communicate over frequency selective fading channels by converting them to an equivalent collection of flat fading...
Provided by University of Minho
-
Whitepapers
Effect of Beampattern on Directional Beacon based Position Location Algorithm for UWB Systems
November 16, 2007, 12:00am PST
Motivated from the results of previous studies, the authors aim to evaluate the effect of antenna beam pattern on the performance of directional beacon based position location algorithm in this...
Provided by University of Minho
-
Whitepapers
C-TREND: A New Technique for Indentifying and Visualizing Trends in Multi-Attribute Transactional Data
June 21, 2007, 12:00am PDT
Organizations and firms are increasingly capturing more data about their customers, suppliers, competitors, and business environment. Most of this data is multi-attribute (multi-dimensional) and...
Provided by University of Minho
-
Whitepapers
A Feature Combination Approach for the Detection of Early Morning Bathroom Activities with Wireless Sensors
November 16, 2012, 12:00am PST
In this paper the authors investigate the use of wearable accelerometers and wireless home sensors for the detection of early morning daily activities. In particular they focus on the detection of...
Provided by University of Minho
-
Whitepapers
Methodically Modeling the Tor Network
June 27, 2012, 12:00am PDT
Live Tor network experiments are difficult due to Tor's distributed nature and the privacy requirements of its client base. Alternative experimentation approaches, such as simulation and...
Provided by University of Minho
-
Whitepapers
Spatial Cloaking for Anonymous Location-Based Services in Mobile Peer-to-Peer Environments
January 1, 2013, 12:00am PST
In this paper, the authors tackle a privacy breach in current Location-Based Services (LBS) where mobile users have to report their exact location information to an LBS provider in order to obtain...
Provided by University of Minho
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Whitepapers
GeoFeed: A Location-Aware News Feed System
June 21, 2012, 12:00am PDT
This paper presents the GeoFeed system; a location-aware news feed system that provides a new platform for its users to get spatially related message updates from either their friends or favorite...
Provided by University of Minho
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Whitepapers
Approximate Evaluation of Range Nearest Neighbor Queries with Quality Guarantee
September 29, 2009, 12:00am PDT
The range Nearest-Neighbor (NN) query is an important query type in location-based services, as it can be applied to the case that an NN query has a spatial region, instead of a location point, as...
Provided by University of Minho
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Whitepapers
Probabilistic Verifiers: Evaluating Constrained Nearest-Neighbor Queries Over Uncertain Data
September 23, 2011, 12:00am PDT
In applications like location-based services, sensor monitoring and biological databases, the values of the database items are inherently uncertain in nature. An important query for uncertain...
Provided by University of Minho
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Whitepapers
Hybrid Cooperative Caching in a Mobile Environment
September 26, 2011, 12:00am PDT
Caching is a key technique for improving data access performance of mobile clients. The emergence of peer-to-peer communication technologies now brings to reality "Cooperative caching" in which...
Provided by University of Minho
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Whitepapers
Application of Geomorphological Data Layers to Landslide Susceptibility Mapping with Analytical Hierarchical Process and GIS Techniques (Case Study: Zonouz Plain, East Azerbaijan, Iran)
November 1, 2012, 12:00am PDT
Without a doubt, landslide is one of the most disastrous natural hazards. Therefore, landslide susceptibility maps in regional scale are useful guide for future development activities. In this...
Provided by University of Minho
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Whitepapers
Asymptotically Optimal Policies for Hard-Deadline Scheduling Over Fading Channels
June 4, 2009, 12:00am PDT
A hard-deadline, opportunistic scheduling problem in which B bits must be transmitted within T time-slots over a time-varying channel is studied: the transmitter must decide how many bits to serve...
Provided by University of Minho
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Whitepapers
Energy-Efficient Scheduling of Delay Constrained Traffic Over Fading Channels
April 27, 2008, 12:00am PDT
This paper considers a scheduling problem of transmitting B bits over T time slots, where the channel fades independently from slot to slot. During each slot, the scheduler determines how many of...
Provided by University of Minho
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Whitepapers
How Much Training and Feedback Are Needed in MIMO Broadcast Channels?
April 30, 2008, 12:00am PDT
The authors consider a MIMO fading broadcast channel where channel state information is acquired at user terminals via downlink training and explicit analog feedback is used to provide transmitter...
Provided by University of Minho
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Whitepapers
Optimized Training and Feedback for MIMO Downlink Channels
April 12, 2009, 12:00am PDT
The authors consider a MIMO fading broadcast channel where channel state information is acquired at user terminals via downlink training and channel feedback is used to provide transmitter Channel...
Provided by University of Minho
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Whitepapers
Transmission Capacity of Wireless Ad Hoc Networks: Successive Interference Cancellation Vs. Joint Detection
March 1, 2009, 12:00am PST
The performance benefits of two interference cancellation methods, Successive Interference Cancellation (SIC) and Joint Detection (JD), in wireless ad hoc networks are compared within the...
Provided by University of Minho
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Whitepapers
Delay Constrained Scheduling Over Fading Channels: Optimal Policies for Monomial Energy-Cost Functions
February 26, 2009, 12:00am PST
A point-to-point discrete-time scheduling problem of transmitting B information bits within T hard delay deadline slots is considered assuming that the underlying energy-bit cost function is a...
Provided by University of Minho
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Whitepapers
De-Hyping Transmit Diversity in Modern MIMO Cellular Systems
July 8, 2009, 12:00am PDT
A contemporary perspective on the tradeoff between transmit antenna diversity and spatial multiplexing is provided. It is argued that, in the context of modern cellular systems and for the...
Provided by University of Minho
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Whitepapers
Identifying Suspicious Activities Through DNS Failure Graph Analysis
August 16, 2010, 12:00am PDT
As a key approach to securing large networks, existing anomaly detection techniques focus primarily on network traffic data. However, the sheer volume of such data often renders detailed analysis...
Provided by University of Minho
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Whitepapers
Efficient Cooperative Spectrum Sensing in Cognitive Radio
October 27, 2009, 12:00am PDT
In this paper, the authors present a new cooperative spectrum sensing scheme, which allocates two separate short periods for sensing and cooperation to achieve high capability of detecting the...
Provided by University of Minho
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Whitepapers
On Achievable Rates of the Two-User Symmetric Gaussian Interference Channel
September 27, 2010, 12:00am PDT
The authors study the Han-Kobayashi (HK) achievable sum rate for the two-user symmetric Gaussian interference channel. They find the optimal power split ratio between the common and private...
Provided by University of Minho
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Whitepapers
What Is the Value of Joint Processing of Pilots and Data in Block-Fading Channels?
April 23, 2009, 12:00am PDT
The spectral efficiency achievable with joint processing of pilot and data symbol observations is compared with that achievable through the conventional (separate) approach of first estimating the...
Provided by University of Minho
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Whitepapers
Training and Feedback Optimization for Multiuser MIMO Downlink
December 7, 2009, 12:00am PST
The authors consider a MIMO fading broadcast channel where the fading channel coefficients are constant over time-frequency blocks that span a coherent time � a coherence bandwidth. In closed-loop...
Provided by University of Minho
-
Whitepapers
De-Hyping Transmit Diversity in Modern MIMO Cellular Systems
July 8, 2009, 12:00am PDT
A contemporary perspective on the tradeoff between transmit antenna diversity and spatial multiplexing is provided. It is argued that, in the context of modern cellular systems and for the...
Provided by University of Minho
-
Whitepapers
Delay Constrained Scheduling Over Fading Channels: Optimal Policies for Monomial Energy-Cost Functions
February 26, 2009, 12:00am PST
A point-to-point discrete-time scheduling problem of transmitting B information bits within T hard delay deadline slots is considered assuming that the underlying energy-bit cost function is a...
Provided by University of Minho
-
Whitepapers
Transmission Capacity of Wireless Ad Hoc Networks: Successive Interference Cancellation Vs. Joint Detection
March 1, 2009, 12:00am PST
The performance benefits of two interference cancellation methods, Successive Interference Cancellation (SIC) and Joint Detection (JD), in wireless ad hoc networks are compared within the...
Provided by University of Minho
-
Whitepapers
Optimized Training and Feedback for MIMO Downlink Channels
April 12, 2009, 12:00am PDT
The authors consider a MIMO fading broadcast channel where channel state information is acquired at user terminals via downlink training and channel feedback is used to provide transmitter Channel...
Provided by University of Minho
-
Whitepapers
How Much Training and Feedback Are Needed in MIMO Broadcast Channels?
April 30, 2008, 12:00am PDT
The authors consider a MIMO fading broadcast channel where channel state information is acquired at user terminals via downlink training and explicit analog feedback is used to provide transmitter...
Provided by University of Minho
-
Whitepapers
Energy-Efficient Scheduling of Delay Constrained Traffic Over Fading Channels
April 27, 2008, 12:00am PDT
This paper considers a scheduling problem of transmitting B bits over T time slots, where the channel fades independently from slot to slot. During each slot, the scheduler determines how many of...
Provided by University of Minho
-
Whitepapers
Asymptotically Optimal Policies for Hard-Deadline Scheduling Over Fading Channels
June 4, 2009, 12:00am PDT
A hard-deadline, opportunistic scheduling problem in which B bits must be transmitted within T time-slots over a time-varying channel is studied: the transmitter must decide how many bits to serve...
Provided by University of Minho
-
Whitepapers
Application of Geomorphological Data Layers to Landslide Susceptibility Mapping with Analytical Hierarchical Process and GIS Techniques (Case Study: Zonouz Plain, East Azerbaijan, Iran)
November 1, 2012, 12:00am PDT
Without a doubt, landslide is one of the most disastrous natural hazards. Therefore, landslide susceptibility maps in regional scale are useful guide for future development activities. In this...
Provided by University of Minho
-
Whitepapers
Hybrid Cooperative Caching in a Mobile Environment
September 26, 2011, 12:00am PDT
Caching is a key technique for improving data access performance of mobile clients. The emergence of peer-to-peer communication technologies now brings to reality "Cooperative caching" in which...
Provided by University of Minho
-
Whitepapers
Probabilistic Verifiers: Evaluating Constrained Nearest-Neighbor Queries Over Uncertain Data
September 23, 2011, 12:00am PDT
In applications like location-based services, sensor monitoring and biological databases, the values of the database items are inherently uncertain in nature. An important query for uncertain...
Provided by University of Minho
-
Whitepapers
Approximate Evaluation of Range Nearest Neighbor Queries with Quality Guarantee
September 29, 2009, 12:00am PDT
The range Nearest-Neighbor (NN) query is an important query type in location-based services, as it can be applied to the case that an NN query has a spatial region, instead of a location point, as...
Provided by University of Minho
-
Whitepapers
GeoFeed: A Location-Aware News Feed System
June 21, 2012, 12:00am PDT
This paper presents the GeoFeed system; a location-aware news feed system that provides a new platform for its users to get spatially related message updates from either their friends or favorite...
Provided by University of Minho
-
Whitepapers
Spatial Cloaking for Anonymous Location-Based Services in Mobile Peer-to-Peer Environments
January 1, 2013, 12:00am PST
In this paper, the authors tackle a privacy breach in current Location-Based Services (LBS) where mobile users have to report their exact location information to an LBS provider in order to obtain...
Provided by University of Minho
-
Whitepapers
Methodically Modeling the Tor Network
June 27, 2012, 12:00am PDT
Live Tor network experiments are difficult due to Tor's distributed nature and the privacy requirements of its client base. Alternative experimentation approaches, such as simulation and...
Provided by University of Minho
-
Whitepapers
A Feature Combination Approach for the Detection of Early Morning Bathroom Activities with Wireless Sensors
November 16, 2012, 12:00am PST
In this paper the authors investigate the use of wearable accelerometers and wireless home sensors for the detection of early morning daily activities. In particular they focus on the detection of...
Provided by University of Minho
-
Whitepapers
C-TREND: A New Technique for Indentifying and Visualizing Trends in Multi-Attribute Transactional Data
June 21, 2007, 12:00am PDT
Organizations and firms are increasingly capturing more data about their customers, suppliers, competitors, and business environment. Most of this data is multi-attribute (multi-dimensional) and...
Provided by University of Minho
-
Whitepapers
Effect of Beampattern on Directional Beacon based Position Location Algorithm for UWB Systems
November 16, 2007, 12:00am PST
Motivated from the results of previous studies, the authors aim to evaluate the effect of antenna beam pattern on the performance of directional beacon based position location algorithm in this...
Provided by University of Minho
-
Whitepapers
Non-Redundant and Redundant Post Coding in OFDM Systems
November 16, 2007, 12:00am PST
Orthogonal Frequency Division Multiplexing (OFDM) provides a viable solution to communicate over frequency selective fading channels by converting them to an equivalent collection of flat fading...
Provided by University of Minho
-
Whitepapers
Design and Analysis of Post-Coded OFDM Systems
December 1, 2008, 12:00am PST
This paper discusses the design and analysis of Post Coded OFDM (PC-OFDM) systems. Coded or precoded OFDM systems are generally employed to overcome the symbol recovery problem in uncoded OFDM...
Provided by University of Minho
-
Whitepapers
Lowcomplexity Post-Coded OFDM Communication System: Design and Performance Analysis
November 16, 2007, 12:00am PST
Orthogonal Frequency Division Multiplexing (OFDM) provides a viable solution to communicate over frequency selective fading channels. However, in the presence of frequency nulls in the channel...
Provided by University of Minho
-
Whitepapers
Network-Compressive Coding for Wireless Sensors with Correlated Data
September 25, 2012, 12:00am PDT
A network-compressive transmission protocol is developed in which correlated sensor observations belonging to a finite alphabet are linearly combined as they traverse the network on their way to a...
Provided by University of Minho
-
Whitepapers
Motion Segmentation by SCC on the Hopkins 155 Database
September 9, 2009, 12:00am PDT
The authors apply the Spectral Curvature Clustering (SCC) algorithm to a benchmark database of 155 motion sequences, and show that it outperforms all other state-of-the-art methods. The average...
Provided by University of Minho
-
Whitepapers
Joint Back-Pressure Power Control and Interference Cancellation in Wireless Multi-Hop Networks
August 31, 2012, 12:00am PDT
Back-pressure routing and power control policies are well-appreciated for maximizing throughput in wireless multi-hop networks, where power control is used to manage interference in a way that...
Provided by University of Minho
-
Whitepapers
Database Security: A Historical Perspective
April 22, 2010, 12:00am PDT
The importance of security in database research has greatly increased over the years as most of critical functionality of the business and military enterprises became digitized. Database is an...
Provided by University of Minho
-
Whitepapers
Reduced-Latency SC Polar Decoder Architectures
May 24, 2012, 12:00am PDT
Polar codes have become one of the most favorable capacity achieving Error Correction Codes (ECC) along with their simple encoding method. However, among the very few prior Successive Cancellation...
Provided by University of Minho
-
Whitepapers
Collaboration in Social Network-Based Information Dissemination
May 24, 2012, 12:00am PDT
Connectivity and trust within social networks have been exploited to build applications on top of these networks, including information dissemination, Sybil defenses, and anonymous communication...
Provided by University of Minho
-
Whitepapers
Precoder Design for Physical Layer Multicasting
May 24, 2012, 12:00am PDT
This paper studies the design of linear precoders via instantaneous rate maximization over a K-user multicast channel, wherein multiple antennas are present at the transmitter as well as at all...
Provided by University of Minho
-
Whitepapers
A Correlation-Aware Data Placement Strategy for Key-Value Stores
April 3, 2011, 12:00am PDT
Key-value stores hold the unprecedented bulk of the data produced by applications such as social networks. Their scalability and availability requirements often outweigh sacrificing richer data...
Provided by University of Minho
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White Papers
GUI Inspection From Source Code Analysis
December 10, 2010, 12:00am PST
Graphical User Interfaces (GUIs) are critical components of today's software. Given their increased relevance, correctness and usability of GUIs are becoming essential. This paper describes the...
Provided by University of Minho
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White Papers
Testing as a Certification Approach
December 10, 2010, 12:00am PST
For years, one of the main reasons to buy commercial software instead of adopting open-source applications was the, supposed, guarantee of quality. Unfortunately that was rarely true and,...
Provided by University of Minho
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White Papers
On the Structure of Unstructured Overlay Networks
April 30, 2008, 12:00am PDT
Unstructured overlay networks are a key component of many peer-to-peer systems. These overlays exhibit a set of interesting properties that derive from their inherent randomness. In this paper,...
Provided by University of Minho
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White Papers
Large-Scale Peer-to-Peer Autonomic Monitoring
October 3, 2008, 12:00am PDT
The increasing scale and complexity of distributed system motivates the need for autonomous management. One of the key aspects in the management of distributed systems is the issue of component...
Provided by University of Minho
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White Papers
X-BOT: A Protocol for Resilient Optimization of Unstructured Overlays
June 18, 2009, 12:00am PDT
Gossip, or epidemic, protocols have emerged as a highly scalable and resilient approach to implement several application level services such as reliable multicast, data aggregation,...
Provided by University of Minho
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White Papers
Gossip-Based Broadcast
February 12, 2010, 12:00am PST
Gossip, or epidemic, protocols have emerged as a powerful strategy to implement highly scalable and resilient reliable broadcast primitives on large scale peer-to-peer networks. Epidemic protocols...
Provided by University of Minho
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White Papers
On Adding Structure to Unstructured Overlay Networks
February 12, 2010, 12:00am PST
Unstructured peer-to-peer overlay networks are very resilient to churn and topology changes, while requiring little maintenance cost. Therefore, they are an infrastructure to build highly scalable...
Provided by University of Minho
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