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National University of Singapore
(189 results)-
White Papers
Integrating Specification and Programs for System Modeling and Verification
April 21, 2009, 12:00am PDT
High level specification languages like CSP use mathematical objects as abstractions to represent systems and processes. System behaviors are described as process expressions combined with...
Provided by National University of Singapore
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Demo Abstract: Towards Bug-Free Implementations for Wireless Sensor Networks
July 22, 2011, 12:00am PDT
TinyOS has been widely used for developing Wireless Sensor Network (WSN) applications. The programming language of TinyOS applications, NesC, provides fine-grained control over the underlying...
Provided by National University of Singapore
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White Papers
ES2: A Cloud Data Storage System for Supporting Both OLTP and OLAP
November 19, 2010, 12:00am PST
Cloud computing represents a paradigm shift driven by the increasing demand of Web based applications for elastic, scalable and efficient system architectures that can efficiently support their...
Provided by National University of Singapore
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White Papers
Skyline Queries Against Mobile Lightweight Devices in MANETs
January 1, 2011, 12:00am PST
Skyline queries are well suited when retrieving data according to multiple criteria. While most previous work has assumed a centralized setting this paper considers skyline querying in a mobile...
Provided by National University of Singapore
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White Papers
Demonstrating a Dynamic Multi-Channel Access 802.11 Mesh Network Prototype for High Bandwidth Requirement
August 19, 2010, 12:00am PDT
Multi-channel access has the potential to solve the throughput and scalability issues that mar the performance of 802.11 mesh and adhoc networks. It allows multiple simultaneous transmissions in a...
Provided by National University of Singapore
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White Papers
Cooperative Spectrum Sensing Protocols for Cognitive Radio Mesh Networks
November 10, 2009, 12:00am PST
In this paper, the authors consider the cooperative spectrum sensing problem in a Cognitive Radio (CR) mesh network, where Secondary Users (SUs) are self-organized into a IEEE 802.16 mesh network...
Provided by National University of Singapore
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White Papers
Joint Cooperative MAC and Routing in IR-UWB Networks
March 14, 2009, 12:00am PDT
The cooperation issue above the physical layer, such as in the medium access control and routing layer, is less investigated in UWB networks. This is despite the large potential of the cooperation...
Provided by National University of Singapore
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White Papers
Markov Decision Process Frameworks for Cooperative Retransmission in Wireless Networks
October 4, 2008, 12:00am PDT
The challenging problem of cooperative retransmission in the wireless networks is investigated in this paper. This paper introduces the centralized and distributed Markov Decision Process (MDP)...
Provided by National University of Singapore
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White Papers
Mobile Target Tracking for Healthcare Applications: Trade-Off Between Accuracy and Energy
April 18, 2008, 12:00am PDT
In healthcare-related human tracking applications for wireless sensor networks, introducing a mobile sensor node into a static node deployment increases its tracking accuracy as the mobile node...
Provided by National University of Singapore
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White Papers
A Cooperative Retransmission Scheme in Wireless Networks With Imperfect Channel State Information
October 6, 2008, 12:00am PDT
A transmitted packet that fails to reach its intended destination may be correctly received by neighbor nodes due to the broadcast nature of the wireless medium. In a cooperative retransmission...
Provided by National University of Singapore
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White Papers
A Low-Overhead Cooperative Retransmission Scheme for IR-UWB Networks
December 3, 2008, 12:00am PST
In this paper, the UWB unique properties such as fine ranging and immunity to small scale fading are utilized in order to exploit the multiuser diversity in UWB networks. The optimal cooperation...
Provided by National University of Singapore
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White Papers
A QoS Network Architecture for Multi-Hop, Multi-Sink Target Tracking WSNs
June 27, 2008, 12:00am PDT
The authors propose a novel routing scheme for providing Quality of Service (QoS) for multi-target tracking in multi-sink Wireless Sensor Networks (WSNs). They first introduce the concept of event...
Provided by National University of Singapore
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White Papers
A2-MAC: An Adaptive, Anycast MAC Protocol for Wireless Sensor Networks
January 19, 2009, 12:00am PST
Advancements in wireless networking and technology have led to the proliferation of tiny computing and sensing devices which are capable of performing collaborative tasks such as tactical...
Provided by National University of Singapore
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White Papers
Throughput and Delay Scaling in Supportive Two-Tier Networks
October 18, 2011, 12:00am PDT
In this paper, the authors studied the throughput and delay scaling laws for a supportive two-tier network, where the secondary tier is willing to relay packets for the primary tier. When the...
Provided by National University of Singapore
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White Papers
A Medium Access Control Protocol for UWB Sensor Networks With QoS Support
January 16, 2009, 12:00am PST
Ultra-WideBand (UWB) is a PHYsical (PHY) layer technology that promises high transmission rates, as well as high resistance to noise and multipath effects. However, the impulse-based nature of...
Provided by National University of Singapore
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White Papers
ROPA: A MAC Protocol for Underwater Acoustic Networks With Reverse Opportunistic Packet Appending
January 4, 2010, 12:00am PST
In most existing sender-initiated handshaking based underwater Media Access Control (MAC) protocols, only the initiating sender is allowed to transmit data packets to its intended receiver after...
Provided by National University of Singapore
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White Papers
A Transmission Scheme for Continuous ARQ Protocols Over Underwater Acoustic Channels
February 15, 2009, 12:00am PST
Due to the half-duplex property of the underwater acoustic channels, the classic Stop-and-Wait ARQ (SW-ARQ) and its variants are generally thought to be the only class of ARQ protocols that can be...
Provided by National University of Singapore
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White Papers
Sector-Based Routing With Destination Location Prediction for Underwater Mobile Networks
March 6, 2009, 12:00am PST
Unlike in terrestrial sensor networks where the locations of destination nodes are often assumed to be fixed and accurately known, such assumptions are usually not valid in underwater sensor...
Provided by National University of Singapore
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White Papers
MACA-U: A Media Access Protocol for Underwater Acoustic Networks
August 13, 2008, 12:00am PDT
Unlike terrestrial wireless communication which uses radio waves, underwater communication relies on acoustic waves. The long latency and limited bandwidth pose great challenges in underwater...
Provided by National University of Singapore
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White Papers
MACA-MN: A MACA-Based MAC Protocol for Underwater Acoustic Networks With Packet Train for Multiple Neighbors
January 31, 2008, 12:00am PST
Unlike the terrestrial wireless networks that utilize the radio channel, underwater networks use the acoustic channel, which poses research challenges in the Medium Access Control (MAC) protocol...
Provided by National University of Singapore
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White Papers
A Graph Theoretic Approach for Optimizing Key Pre-Distribution in Wireless Sensor Networks
May 7, 2009, 12:00am PDT
Finding an optimal key assignment (subject to given constraints) for a key pre-distribution scheme in wireless sensor networks is a difficult task. Hence, most of the practical schemes are based...
Provided by National University of Singapore
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White Papers
Transmission Schemes for Lifetime Maximization in Wireless Sensor Networks: Uncorrelated Source Observations
August 4, 2007, 12:00am PDT
The authors study transmission schemes for lifetime maximization in wireless sensor networks. Specifically they consider the network where all the sensors observe uncorrelated signals and forward...
Provided by National University of Singapore
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White Papers
End-to-End Outage Probability Minimization in OFDM Based Linear Multi-Hop Networks
February 27, 2008, 12:00am PST
This paper is concerned with the end-to-end transmission outage in an OFDM based wireless multi-hop network. The network consists of a source node, a destination node, and a set of serial relay...
Provided by National University of Singapore
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White Papers
Capacity Analysis and Power Allocation Over Non-Identical MISO Rayleigh Fading Channels
February 27, 2008, 12:00am PST
The authors analyze the capacity of a multiple-input single-output system over Rayleigh fading channels. The channels are assumed to be independent and non-identically distributed. Simple,...
Provided by National University of Singapore
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End-to-End Resource Allocation in OFDM Based Linear Multi-Hop Networks
February 21, 2008, 12:00am PST
The authors study the end-to-end resource allocation in an OFDM based multi-hop network consisting of a one-dimensional chain of nodes including a source, a destination, and multiple relays. The...
Provided by National University of Singapore
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White Papers
A Generalized Gradient Scheduling Algorithm in Wireless Networks for Variable Rate Transmission
August 4, 2007, 12:00am PDT
Average transmission rate and rate oscillation are two important performance metrics for most wireless services. Both are often needed to be optimized in multi-user scheduling and resource...
Provided by National University of Singapore
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White Papers
Non-Cooperative Power Control for Faded Wireless Ad Hoc Networks
August 8, 2007, 12:00am PDT
The problem of non-cooperative power control is studied for wireless ad hoc networks supporting data services. The authors develop a Maximum Throughput based Non-cooperative Power control Game...
Provided by National University of Singapore
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White Papers
Time Sharing Policy in Wireless Networks for Variable Rate Transmission
July 2, 2007, 12:00am PDT
For most of wireless services with variable rate transmission, both average rate and rate oscillation are important performance metrics. One often needs to decide how much rate oscillation the...
Provided by National University of Singapore
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White Papers
Performance Analysis of Iteratively Decoded Variable-Length Space-Time Coded Modulation
July 2, 2007, 12:00am PDT
It is demonstrated that iteratively Decoded Variable Length Space Time Coded Modulation (VL-STCM-ID) schemes are capable of simultaneously providing both coding gain as well as multiplexing and...
Provided by National University of Singapore
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White Papers
Closed-Form Performance of MFSK Signals With Diversity Reception Over Non-Identical Fading Channels
May 23, 2007, 12:00am PDT
This paper provides a comprehensive study on the error performance of non-coherent orthogonal M-ary Frequency-Shift-Keying (FSK) signals with various diversity combining schemes over fading...
Provided by National University of Singapore
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White Papers
Continuous Online Index Tuning in Moving Object Databases
January 18, 2010, 12:00am PST
Database tuning is crucial to the efficient operation of a DataBase Management System (DBMS). In fact, most commercial DBMS provides some tuning tools. The goal of tuning is to ensure the database...
Provided by National University of Singapore
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White Papers
Sense the Physical, Walkthrough the Virtual, Manage the Co (Existing) Spaces: A Database Perspective
September 1, 2009, 12:00am PDT
In a co-space environment, the physical space and the virtual space co-exist, and interact simultaneously. While the physical space is virtually enhanced with information, the virtual space is...
Provided by National University of Singapore
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White Papers
Continuous Content-Based Copy Detection Over Streaming Videos
November 22, 2007, 12:00am PST
Digital videos are increasingly adopted in various multimedia applications where they are usually broadcasted or transmitted as video streams. Continuously monitoring copies on the fast and long...
Provided by National University of Singapore
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White Papers
Querying Complex Spatio-Temporal Sequences in Human Motion Databases
November 21, 2007, 12:00am PST
Content-based retrieval of spatio-temporal patterns from human motion databases is inherently nontrivial since finding effective distance measures for such data is difficult. These data are...
Provided by National University of Singapore
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White Papers
Disseminating Streaming Data in a Dynamic Environment: An Adaptive and Cost-Based Approach
August 11, 2007, 12:00am PDT
In a distributed stream processing system, streaming data are continuously disseminated from the sources to the distributed processing servers. To enhance the dissemination efficiency, these...
Provided by National University of Singapore
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White Papers
Toward Massive Query Optimization in Large-Scale Distributed Stream Systems
August 31, 2008, 12:00am PDT
Existing distributed stream systems adopt a tightly-coupled communication paradigm and focus on fine-tuning of operator placements to achieve communication efficiency. This kind of approach is...
Provided by National University of Singapore
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White Papers
Rethinking the Design of Distributed Stream Processing Systems
January 29, 2008, 12:00am PST
In this paper, the authors present a novel architecture to support large scale stream processing services in a widely distributed environment. The proposed system, COSMOS, distinguishes itself by...
Provided by National University of Singapore
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White Papers
Software Specification Discovery: A New Data Mining Approach
September 29, 2007, 12:00am PDT
This paper have proposed a new data mining approach, namely specification discovery, which is a process for automated extraction of software specification from program artifacts. Three separate...
Provided by National University of Singapore School of Business
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White Papers
Dagster: Contributor-Aware End-Host Multicast for Media Streaming in Heterogeneous Environment
July 12, 2007, 12:00am PDT
The paper presents Dagster, an end-host multicast scheme for delivering multimedia streams. Unlike previous schemes, Dagster does not constrain the amount of bandwidth a node must donate. Instead,...
Provided by National University of Singapore School of Business
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White Papers
An XML-Based Data Integrity Service Model for Web Intermediaries
January 1, 2008, 12:00am PST
Recent research in active network and web intermediary services result in web contents being disassembled, transformed and recomposed in a pipelined process as they flow through the Internet. This...
Provided by National University of Singapore School of Business
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White Papers
Pharmaco-Cybernetics as an Interactive Component of Pharma-Culture: Empowering Drug Knowledge Through User-, Experience-And Activity-Centered Designs
October 31, 2009, 12:00am PDT
The advent of the World Wide Web (WWW) has led to the creation of many web publishing platforms. Patients are becoming more well-informed through drug and health-related information over the...
Provided by National University of Singapore
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White Papers
Extended XML Tree Pattern Matching: Theories and Algorithms
January 19, 2010, 12:00am PST
As business and enterprises generate and exchange XML data more often, there is an increasing need for efficient processing of queries on XML data. Searching for the occurrences of a tree pattern...
Provided by National University of Singapore
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White Papers
Towards an Effective XML Keyword Search
December 16, 2009, 12:00am PST
Inspired by the great success of Information Retrieval (IR) style keyword search on the web, keyword search on XML has emerged recently. The difference between text database and XML database...
Provided by National University of Singapore
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Efficient Label Encoding for Range-Based Dynamic XML Labeling Schemes
December 18, 2009, 12:00am PST
Designing dynamic labeling schemes to support order-sensitive queries for XML documents has been recognized as an important research problem. In this paper, the authors consider the problem of...
Provided by National University of Singapore
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Demonstrating Effective Ranked XML Keyword Search With Meaningful Result Display
January 5, 2009, 12:00am PST
In this paper, the authors demonstrate an effective ranked XML keyword search with meaningful result display. The system, named ICRA, recognizes a set of object classes in XML data for result...
Provided by National University of Singapore
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Effective XML Keyword Search With Relevance Oriented Ranking
January 5, 2009, 12:00am PST
Inspired by the great success of Information Retrieval (IR) style keyword search on the web, keyword search on XML has emerged recently. The difference between text database and XML database...
Provided by National University of Singapore
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White Papers
VERT: A Semantic Approach for Content Search and Content Extraction in XML Query Processing
July 11, 2007, 12:00am PDT
Processing a twig pattern query in XML document includes structural search and content search. Most existing algorithms only focus on structural search. They treat content nodes the same as...
Provided by National University of Singapore
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White Papers
A Dynamic Labeling Scheme Using Vectors
May 25, 2007, 12:00am PDT
The labeling problem of dynamic XML documents has received increasing research attention. When XML documents are subject to insertions and deletions of nodes, it is important to design a labeling...
Provided by National University of Singapore
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White Papers
Capitalizing On Capitol Hill: Informed Trading By Hedge Fund Managers
November 1, 2010, 12:00am PDT
In this paper, the authors examine the hypothesis that hedge fund managers obtain an informational advantage in securities trading through their connections with lobbyists. Using datasets on hedge...
Provided by National University of Singapore
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White Papers
Sync-TCP: A New Approach to High Speed Congestion Control
August 27, 2009, 12:00am PDT
As bandwidth in the Internet continues to grow, there will be more and more long fat network pipes with abundant residual bandwidth. At the same time, there is also a gradual and steady increase...
Provided by National University of Singapore
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White Papers
A Resource Allocation Scheme to Achieve Fairness in TH-UWB Sensor Networks With Near-Far Effects
June 16, 2008, 12:00am PDT
The inherent near-far effect in wireless networks causes nodes that are further away from the receiver to suffer from throughput degradation, as packets from nodes that are nearer are typically...
Provided by National University of Singapore
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White Papers
Prioritizing Sensed Data Transmission by Consensus Relation in Wireless Sensor Network
September 5, 2008, 12:00am PDT
In this paper the authors propose an approach to prioritizing order of transmission of sensed data in wireless sensor network that are very popular in, for example, environmental monitoring. The...
Provided by National University of Singapore
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White Papers
Link Lifetimes: Distribution, Estimation and Application in Mobile Ad Hoc Networks
October 30, 2008, 12:00am PDT
Lifetime of a link defines the amount of time the link is available for transmission. In this paper, the authors begin with associating a statistical parametric model for link lifetime...
Provided by National University of Singapore
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A Resource Allocation Scheme for TH-UWB Networks With Multiple Sinks
January 4, 2008, 12:00am PST
In this paper, the authors study the time-slot allocation problem in a multi-sink single-hop TH-UWB network scenario, where the traffic from a sensor node is anycasted via a single hop to any one...
Provided by National University of Singapore
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Incentive-Compatible Resource Allocation in Overlapping Heterogeneous Wireless Networks
August 7, 2009, 12:00am PDT
This paper considers the coordinated radio resource allocation problem for users which are simultaneously covered by multiple overlapping heterogeneous wireless networks. As the resource...
Provided by National University of Singapore
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White Papers
Pritrans: A Prioritized Converge-Cast Scheme Using Consensus Ranking in Wireless Sensor Networks
January 18, 2010, 12:00am PST
Data packets collected in wireless sensor networks may contain information of different importance, including regular updates and critical data triggered by important events. In a converge-cast...
Provided by National University of Singapore
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White Papers
DEAL: Discover and Exploit Asymmetric Links in Dense Wireless Sensor Networks
January 9, 2009, 12:00am PST
Asymmetric links commonly exist in low power wireless sensor networks. However, it is difficult to discover and exploit them efficiently. In this paper, the authors propose DEAL, a link management...
Provided by National University of Singapore
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White Papers
Practical Connectivity-Based Routing in Wireless Sensor Networks Using Dimension Reduction
January 14, 2009, 12:00am PST
Connectivity-based routing protocols provide an attractive option for point to point communication in wireless networks due to its potential for low routing overhead. However, when the entire...
Provided by National University of Singapore
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White Papers
Hierarchical Cost-Sensitive Web Resource Acquisition for Record Matching
June 9, 2010, 12:00am PDT
Web information is increasingly used as evidence in solving various problems, including record matching. However, acquiring web-based resources is slow and can incur other access costs. As such,...
Provided by National University of Singapore
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White Papers
Rich and Dynamic Library Catalogs: A Case Study of Online Search Interfaces
August 13, 2007, 12:00am PDT
The authors redesign the user interface of an online library catalog, leveraging current web technologies that allow dynamic and fine-grained user interaction. Over the course of the iterative...
Provided by National University of Singapore
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White Papers
Robust Argumentative Zoning for Sensemaking in Scholarly Documents
April 14, 2011, 12:00am PDT
The authors present an automated approach to classify sentences of scholarly work with respect to their rhetorical function. While previous work that achieves this task of argumentative zoning...
Provided by National University of Singapore
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Extracting Formulaic and Free Text Clinical Research Articles Metadata Using Conditional Random Fields
June 1, 2010, 12:00am PDT
The authors explore the use of Conditional Random Fields (CRFs) to automatically extract important metadata from clinical research papers. These metadata fields include formulaic metadata about...
Provided by National University of Singapore
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White Papers
Video Retrieval Using High Level Features: Exploiting Query Matching and Confidence-Based Weighting
January 1, 2011, 12:00am PST
Recent research in video retrieval has focused on automated, high-level feature indexing on shots or frames. One important application of such indexing is to support precise video retrieval. The...
Provided by National University of Singapore
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White Papers
FireCite: Lightweight Real-Time Reference String Extraction From Webpages
August 7, 2009, 12:00am PDT
The authors present FireCite, a Mozilla Firefox browser extension that helps scholars assess and manage scholarly references on the web by automatically detecting and parsing such reference...
Provided by National University of Singapore
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White Papers
NPIC: Hierarchical Synthetic Image Classification Using Image Search and Generic Features
January 1, 2011, 12:00am PST
The authors introduce NPIC, an image classification system that focuses on synthetic (e.g., non-photographic) images. They use class-specific keywords in an image search engine to create a noisily...
Provided by National University of Singapore
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White Papers
Perspectives on Crowdsourcing Annotations for Natural Language Processing
March 26, 2011, 12:00am PDT
Crowdsourcing has emerged as a new method for obtaining annotations for training models for machine learning. While many variants of this process exist, they largely differ in their method of...
Provided by National University of Singapore
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White Papers
Efficient WebBased Linkage of Short to Long Forms
June 13, 2008, 12:00am PDT
Abbreviations, acronyms, initialisms, and shortenings frequently occur in many texts found on the Web, such as publication metadata, stock ticker codes, and biological papers. To connect these...
Provided by National University of Singapore
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White Papers
Authenticating Aggregate Range Queries Over Multidimensional Dataset
March 22, 2011, 12:00am PDT
The authors are interested in the integrity of the query results from an outsourced database service provider. Alice passes a set D of d-dimensional points, together with some authentication tag...
Provided by National University of Singapore
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White Papers
Authenticating Aggregate Range Queries Over Dynamic Multidimensional Dataset
March 29, 2011, 12:00am PDT
The authors are interested in the integrity of the query results from an outsourced database service provider. Alice passes a set D of d-dimensional points, together with some authentication tag...
Provided by National University of Singapore
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White Papers
DCMP: A Distributed Cycle Minimization Protocol for Peer-to-Peer Networks
June 27, 2007, 12:00am PDT
Broadcast-based Peer-to-Peer (P2P) networks, including flat (e.g., Gnutella) and two-layer super-peer implementations (e.g., Kazaa), are extremely popular nowadays due to their simplicity, ease of...
Provided by National University of Singapore
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White Papers
Competition And Innovation: The Inverted-U Relationship Revisited
February 15, 2011, 12:00am PST
The author re-examines the inverted-U relationship between competition and innovation (originally modeled and tested by Aghion et al. [2005]) by using data from publicly traded manufacturing firms...
Provided by National University of Singapore
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White Papers
End-to-End Outage Minimization in OFDM Based Linear Relay Networks
January 21, 2009, 12:00am PST
Multi-hop relaying is an economically efficient architecture for coverage extension and throughput enhancement in future wireless networks. OFDM, on the other hand, is a spectrally efficient...
Provided by National University of Singapore
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White Papers
Protecting Infrastructure Networks From Cost-Based Attacks
January 4, 2009, 12:00am PST
It has been known that heterogeneous networks are vulnerable to the intentional removal of a small fraction of highly connected or loaded nodes, which implies that, to protect a network...
Provided by National University of Singapore
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White Papers
On the Compression of Cryptographic Keys
February 19, 2008, 12:00am PST
Any secured system can be modeled as a capability-based access control system in which each user is given a set of secret keys of the resources he is granted access to. In some large systems with...
Provided by National University of Singapore
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White Papers
Refinements of Miller's Algorithm Over Weierstrass Curves Revisited
March 2, 2011, 12:00am PST
In 1986 Victor Miller described an algorithm for computing the Weil pairing in his unpublished manuscript. This algorithm has then become the core of all pairing-based cryptosystems. Many...
Provided by National University of Singapore
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Byzantine Modification Detection in Multicast Networks With Random Network Coding
April 8, 2010, 12:00am PDT
This paper gives an information theoretic approach for detecting Byzantine modifications in networks employing random linear network coding. Each exogenous source packet is augmented with a...
Provided by National University of Singapore
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White Papers
Greedy Virtual Coordinates for Geographic Routing
September 3, 2007, 12:00am PDT
The authors present a new approach for generating virtual coordinates that produces usable coordinates quickly and improves the routing performance of existing geographic routing algorithms....
Provided by National University of Singapore
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White Papers
Remote Integrity Check With Dishonest Storage Server
November 3, 2008, 12:00am PST
The authors are interested in this problem: a verifier, with a small and reliable storage, wants to periodically check whether a remote server is keeping a large file x. A dishonest server, by...
Provided by National University of Singapore
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White Papers
Debugging Statecharts Via Model-Code Traceability
July 24, 2008, 12:00am PDT
Model-driven software development involves constructing behavioral models from informal English requirements. These models are then used to guide software construction. The compilation of...
Provided by National University of Singapore
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White Papers
Footprinter: Round-Trip Engineering Via Scenario and State Based Models
December 5, 2008, 12:00am PST
In model-driven software development, while scenario based models are closer to distributed system requirements, state-based models are suitable for code generation. The tool 'Footprinter'...
Provided by National University of Singapore
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