National University of Singapore

Displaying 1-40 of 207 results

  • White Papers // Feb 2014

    Effective Multi-Modal Retrieval Based on Stacked Auto-Encoders

    Multi-modal retrieval is emerging as a new search paradigm that enables seamless information retrieval from various types of media. For example, users can simply snap a movie poster to search relevant reviews and trailers. To solve the problem, a set of mapping functions are learned to project high-dimensional features extracted...

    Provided By National University of Singapore

  • White Papers // Jan 2014

    Random Number Conversion and LOCC Conversion via Restricted Storage

    The authors consider Random Number Conversion (RNC) through random number storage with restricted size. They clarify the relation between the performance of RNC and the size of storage in the framework of first- and second-order asymptotics, and derive their rate regions. Then, they show that the results for RNC with...

    Provided By National University of Singapore

  • White Papers // Jan 2014

    Ubiquitous Memory Introspection

    Modern memory systems play a critical role in the performance of applications, but a detailed understanding of the application behavior in the memory system is not trivial to attain. It requires time consuming simulations and detailed modeling of the memory hierarchy, often using long address traces. It is increasingly possible...

    Provided By National University of Singapore

  • White Papers // Dec 2013

    Efficient In-Memory Data Management: An Analysis

    Given the explosion of big data analytics, it is important to understand the performance costs and limitations of existing approaches for in-memory data management. Broadly, in-memory data management covers two main types of roles: supporting analytics operations such as iterative algorithms and supporting storage and retrieval operations on arbitrary key-value...

    Provided By National University of Singapore

  • White Papers // Oct 2013

    Real-time and Low Power Embedded l1-Optimization Solver Design

    Basis Pursuit DeNoising (BPDN) is an optimization method used in cutting edge computer vision and compressive sensing research. Although hosting a BPDN solver on an embedded platform is desirable because analysis can be performed in real-time, existing solvers are generally unsuitable for embedded implementation due to either poor run-time performance...

    Provided By National University of Singapore

  • White Papers // Aug 2013

    A Performance Study of Three Disk-Based Structures for Indexing and Querying Frequent Itemsets

    Frequent itemset mining is an important problem in the data mining area. Extensive efforts have been devoted to developing efficient algorithms for mining frequent itemsets. However, not much attention is paid on managing the large collection of frequent itemsets produced by these algorithms for subsequent analysis and for user exploration....

    Provided By National University of Singapore

  • White Papers // Aug 2013

    Efficient Indexing for Diverse Query Results

    In this paper, the authors examine the problem of computing diverse query results which is useful for browsing search results in online shopping applications. The search results are diversified wrt a sequence of output attributes (termed d-order) where an attribute that appears earlier in the d-order has higher priority for...

    Provided By National University of Singapore

  • White Papers // Aug 2013

    A Quantitative Evaluation of Privilege Separation in Web Browser Designs

    Privilege separation is a fundamental security concept that has been used in designing many secure systems. A number of recent works propose redesigning web browsers with greater privilege separation for better security. However, privilege-separated designs require a fine balance between security benefits and other competing concerns, such as performance. In...

    Provided By National University of Singapore

  • White Papers // Aug 2013

    MAMPSx: A Design Framework for Rapid Synthesis of Predictable Heterogeneous MPSoCs

    Heterogeneous Multi-Processor System-on-Chip (HMPSoC) is becoming popular as a means of meeting energy efficiency requirements of modern embedded systems. However, as these HMPSoCs run multimedia applications as well, they also need to meet real-time requirements. Designing these predictable HMPSoCs is a key challenge, as the current design methods for these...

    Provided By National University of Singapore

  • White Papers // Aug 2013

    Power-Performance Modeling on Asymmetric Multi-Cores

    Asymmetric multi-core architectures have recently emerged as a promising alternative in a power and thermal constrained environment. They typically integrate cores with different power and performance characteristics, which makes mapping of workloads to appropriate cores a challenging task. Limited number of performance counters and heterogeneous memory hierarchy increase the difficulty...

    Provided By National University of Singapore

  • White Papers // Jul 2013

    Run-Time Mapping for Reliable Many-Cores Based on Energy/Performance Trade-offs

    To accommodate the applications' ever-increasing demands and to achieve and exploit easily-manageable scalability, complex many-core systems are built by integrating low-cost Commercial Off-The-Shelf (COTS) components. Most recent many-core systems consist of processing nodes interconnected via Network-on-Chips (NoCs) in a mesh-based architecture. This paper presents a run-time resource manager for NoC-based...

    Provided By National University of Singapore

  • White Papers // Jul 2013

    Introduction to Malware Analysis

    Malware has become the spotlight of security threats on the virtual world. Many different kind of malware exist. Some have destruction capability such as deletion of data, while the other is more stealthy (eg. log keystrokes). The foremost goal of malware analysis is to understand malware behaviors. Through the understanding...

    Provided By National University of Singapore

  • White Papers // Jul 2013

    Aging-Aware Hardware-Software Task Partitioning for Reliable Reconfigurable Multiprocessor Systems

    Homogeneous multiprocessor systems with reconfigurable area (also known as reconfigurable multiprocessor systems) are emerging as a popular design choice in current and future technology nodes to meet the heterogeneous computing demand of a multitude of applications enabled on these platforms. Application specific mapping decisions on such a platform involve partitioning...

    Provided By National University of Singapore

  • White Papers // Jul 2013

    Enhancing VHDL Learning Through a Light-Weight Integrated Environment for Development and Automated Checking

    The development environments for Hardware Description Languages (HDLs) are essentially meant and designed for highly trained professionals/ engineers and as such are not suitable for use as an introductory tool for students learning HDLs. With students adopting a variety of operating systems, there is a need for a light-weight and...

    Provided By National University of Singapore

  • White Papers // Jun 2013

    Implementation of Core Coalition on FPGAs

    Embedded systems increasingly need to support dynamic and diverse application landscape. In response, performance asymmetric multi-cores, comprising of identical instruction-set architecture but micro-architecturally distinct set of simple and complex cores, have emerged as an attractive alternative to accommodate software diversity. Dynamic heterogeneous multi-core architectures take this concept forward by allowing...

    Provided By National University of Singapore

  • White Papers // Jun 2013

    Incorporating Energy and Throughput Awareness in Design Space Exploration and Run-time Mapping for Heterogeneous MPSoCs

    The advancement in process technology has enabled integration of different types of processing cores into a single chip towards creating heterogeneous Multi-Processor Systems-on-Chip (MPSoCs). While providing high level of computation power to support complex applications, these modern systems also introduce novel challenges for system designers, like managing a huge number...

    Provided By National University of Singapore

  • White Papers // Jun 2013

    Task Scheduling on Adaptive Multi-Core

    Multi-cores have become ubiquitous both in the general-purpose computing and the embedded domain. The current technology trends show that the number of on-chip cores is rapidly increasing, while their complexity is decreasing due to power and thermal constraints. Increasing number of simple cores enable parallel applications benefit from abundant Thread-Level...

    Provided By National University of Singapore

  • White Papers // Jun 2013

    RAPIDITAS: RAPId Design-Space-Exploration Incorporating Trace-Based Analysis and Simulation

    Simulation-based Design Space Exploration (DSE) to evaluate all possible mappings for a given application and Multi-Processor System-on-Chip (MPSoC) platform is computationally costly for large problems. Even using efficient exploration methodologies to evaluate the mappings cannot overcome the evaluation time bottleneck. This paper presents a novel DSE methodology that analyzes the...

    Provided By National University of Singapore

  • White Papers // Jun 2013

    Energy-Aware Dynamic Reconfiguration of Communication-Centric Applications for Reliable MPSoCs

    To accommodate the ever increasing demands of applications and for the ease of scalability, Multi-Processor system-on-chips (MPSoCs) are becoming a popular design choice in current and future technologies with streaming multimedia and other communication-centric applications constituting a large fraction of the application space. Mapping and scheduling of these applications on...

    Provided By National University of Singapore

  • White Papers // May 2013

    Converse Bounds for Assorted Codes in the Finite Blocklength Regime

    The authors study converse bounds for unequal error protection codebooks with k > 1 different classes of codewords. They dub these unequal error protection codes "Assorted codes". They extend a finite blocklength converse bound due to Polyanskiy-Poor-Verdu to apply to assorted codes and use this extension to obtain a refined...

    Provided By National University of Singapore

  • White Papers // May 2013

    On the Dispersions of the Discrete Memoryless Interference Channel

    In this paper, achievable dispersions for the Discrete Memoryless Interference Channel (DM-IC) are derived. In other words, they characterize the backoff from the Han-Kobayashi (HK) achievable region, the largest inner bound known to date for the DM-IC. In addition, they also characterize the backoff from Sato's region in the strictly...

    Provided By National University of Singapore

  • White Papers // May 2013

    Efficient Routing on Multilayered Communication Networks

    The authors study the optimal routing on multilayered communication networks, which are composed of two layers of sub-networks. One is a wireless network, and the other is a wired network. They develop a simple recurrent algorithm to find an optimal routing on this kind of multilayered network, where the single-channel...

    Provided By National University of Singapore

  • White Papers // May 2013

    Communication and Migration Energy Aware Task Mapping for Reliable Multiprocessor Systems

    Heterogeneous Multi-Processor Systems-on-Chip (MPSoCs) are emerging as a promising solution in deep sub-micron technology nodes to satisfy design performance and power requirements. However, shrinking transistor geometry and aggressive voltage scaling are negatively impacting the dependability of these MPSoCs by increasing the chances of failures. This paper proposes an offline (design-time)...

    Provided By National University of Singapore

  • White Papers // Apr 2013

    A Formula for the Capacity of the General Gelfand-Pinsker Channel

    The authors consider the Gel'fand-Pinsker problem in which the channel and state are general, i.e., possibly non-stationary, non-memoryless and non-ergodic. Using the information spectrum method and a non-trivial modification of the piggyback coding lemma by Wyner, they prove that the capacity can be expressed as an optimization over the difference...

    Provided By National University of Singapore

  • White Papers // Apr 2013

    Towards General Security Support in the Browser Environment

    The web browser has evolved into a complex execution environment for rich Internet applications, providing support for advanced layout and various executable components. However, the security mechanisms in browsers do not evolve at the same pace to provide adequate protection for web applications. In this paper, the authors give a...

    Provided By National University of Singapore

  • White Papers // Mar 2013

    CoMP Meets Energy Harvesting: A New Communication and Energy Cooperation Paradigm

    In this paper, the authors investigate joint communication and energy cooperation in cellular networks for the Coordinated Multi-Point (CoMP) downlink transmission with Base Stations (BSs) powered by renewable energy. For the purpose of exposition, they consider a simplified CoMP model with two BSs cooperatively serving two Mobile Stations (MSs), where...

    Provided By National University of Singapore

  • White Papers // Mar 2013

    Multiuser MISO Beamforming for Simultaneous Wireless Information and Power Transfer

    In this paper, the authors study a multiuser Multiple-Input Single-Output (MISO) broadcast system for Simultaneous Wireless Information and Power Transfer (SWIPT), where a multi-antenna Access Point (AP) sends information and energy simultaneously via beam-forming to multiple single-antenna receivers. They maximize the weighted sum-power transferred to Energy Harvesting (EH) receivers subject...

    Provided By National University of Singapore

  • White Papers // Feb 2013

    Splash: Fast Data Dissemination With Constructive Interference in Wireless Sensor Networks

    It is well-known that the time taken for disseminating a large data object over a wireless sensor network is dominated by the overhead of resolving the contention for the underlying wireless channel. In this paper, the authors propose a new dissemination protocol called Splash that eliminates the need for contention...

    Provided By National University of Singapore

  • White Papers // Feb 2013

    Opportunistic Wireless Energy Harvesting in Cognitive Radio Networks

    Wireless networks can be self-sustaining by harvesting energy from ambient Radio-Frequency (RF) signals. Recently, researchers have made progress on designing efficient circuits and devices for RF energy harvesting suitable for low-power wireless applications. Motivated by this and building upon the classic Cognitive Radio (CR) network model, this paper proposes a...

    Provided By National University of Singapore

  • White Papers // Feb 2013

    MIMO Broadcasting for Simultaneous Wireless Information and Power Transfer

    Wireless Energy Transfer (WET) is a promising technology to provide virtually perpetual energy supplies to wireless networks. Generally speaking, WET is implementable by either the "Near-field" ElectroMagnetic (EM) induction or the "Far-field" EM radiation, for short and long range applications, respectively. In this paper, the latter case in the particular...

    Provided By National University of Singapore

  • White Papers // Feb 2013

    Wireless Information and Power Transfer: A Dynamic Power Splitting Approach

    Energy harvesting is a promising solution to prolong the operation time of energy-constrained wireless networks. In particular, scavenging energy from ambient radio signals, namely Wireless Energy Harvesting (WEH), has recently drawn significant attention. In this paper, the authors consider a point-to-point wireless link over the flat-fading channel, where the receiver...

    Provided By National University of Singapore

  • White Papers // Jan 2013

    A Novel Mode Switching Scheme Utilizing Random Beamforming for Opportunistic Energy Harvesting

    Since radio signals carry both energy and information simultaneously, a unified study on Simultaneous Wireless Information and Power Transfer (SWIPT) has recently attracted a great deal of attention for providing wireless energy to communication devices. This paper proposes a novel receiver mode switching scheme for SWIPT and the enabling transmitter...

    Provided By National University of Singapore

  • White Papers // Jan 2013

    Energy Cooperation in Cellular Networks With Renewable Powered Base Stations

    In this paper, the authors propose a model for energy cooperation between cellular Base Stations (BSs) with individual renewable energy sources, limited energy storages and connected by resistive power lines for energy sharing. When the renewable energy profile and energy demand profile at all BSs are deterministic or known ahead...

    Provided By National University of Singapore

  • White Papers // Dec 2012

    Speeding Up Ate Pairing Computation in Affine Coordinates

    At Pairing 2010, researcher's analysis showed that Ate pairing computation in affine coordinates may be much faster than projective coordinates at high security levels. In this paper, the authors further investigate techniques to speed up ate pairing computation in affine coordinates. They first analyze ate pairing computation using 4-ary miller...

    Provided By National University of Singapore

  • White Papers // Dec 2012

    Communication and Migration Energy Aware Design Space Exploration for Multicore Systems with Intermittent Faults

    Shrinking feature-size and growing transistor density are negatively impacting the dependability of Multi-Processor System-on-Chips (MPSoCs) by increasing the chances of faults (permanent, intermittent and transient). Recently, intermittent device defects are gaining significant attention among research community. These are a class of hardware faults occurring frequently but irregularly over a period...

    Provided By National University of Singapore

  • White Papers // Dec 2012

    Reliability-Driven Task Mapping for Lifetime Extension of Networks-on-Chip Based Multiprocessor Systems

    Shrinking transistor geometries, aggressive voltage scaling and higher operating frequencies have negatively impacted the lifetime reliability of embedded multi-core systems. In this paper, a convex optimization-based task-mapping technique is proposed to extend the lifetime of a Multi-Processor Systems-on-Chip (MPSoCs). The proposed technique generates mappings for every application enabled on the...

    Provided By National University of Singapore

  • White Papers // Dec 2012

    A Preference Model for Deciding the Market Share of Network Service Providers

    Started with a single best-effort service, the Internet has evolved to an ecosystem where different Service Providers (SPs), e.g., Internet Service Providers (ISPs) and Content Distribution Networks (CDNs) provide different types of services, e.g., IP transit and content caching/distribution. In this paper, the authors propose a preference model on how...

    Provided By National University of Singapore

  • White Papers // Dec 2012

    CADSE: Communication Aware Design Space Exploration for Efficient Run-Time MPSoC Management

    Real-time multi-media applications are increasingly mapped on modern embedded systems based on Multi-Processor Systems-on-Chip (MPSoC). Tasks of the applications need to be mapped on the MPSoC resources efficiently in order to satisfy their performance constraints. Exploring all the possible mappings, i.e., tasks to resources combinations exhaustively may take days or...

    Provided By National University of Singapore

  • White Papers // Nov 2012

    Optimal Power and Range Adaptation for Green Broadcasting

    Improving energy efficiency is key to network providers maintaining profit levels and an acceptable carbon footprint in the face of rapidly increasing data traffic in cellular networks in the coming years. The energy-saving concept studied in this paper is the adaptation of a Base Station's (BS's) transmit power levels and...

    Provided By National University of Singapore

  • White Papers // Nov 2012

    The Stream Cipher Core of the 3GPP Encryption Standard 128-EEA3: Timing Attacks and Countermeasures

    The core of the 3rd Generation Partnership Project (3GPP) encryption standard 128-EEA3 is a stream cipher called ZUC. It was designed by the Chinese Academy of Sciences and proposed for inclusion in the cellular wireless standards called "Long Term Evolution" or "4G". The LFSR-based cipher uses a 128-bit key. In...

    Provided By National University of Singapore

  • White Papers // Feb 2013

    Wireless Information and Power Transfer: A Dynamic Power Splitting Approach

    Energy harvesting is a promising solution to prolong the operation time of energy-constrained wireless networks. In particular, scavenging energy from ambient radio signals, namely Wireless Energy Harvesting (WEH), has recently drawn significant attention. In this paper, the authors consider a point-to-point wireless link over the flat-fading channel, where the receiver...

    Provided By National University of Singapore

  • White Papers // Nov 2012

    Optimal Power and Range Adaptation for Green Broadcasting

    Improving energy efficiency is key to network providers maintaining profit levels and an acceptable carbon footprint in the face of rapidly increasing data traffic in cellular networks in the coming years. The energy-saving concept studied in this paper is the adaptation of a Base Station's (BS's) transmit power levels and...

    Provided By National University of Singapore

  • White Papers // Jan 2013

    A Novel Mode Switching Scheme Utilizing Random Beamforming for Opportunistic Energy Harvesting

    Since radio signals carry both energy and information simultaneously, a unified study on Simultaneous Wireless Information and Power Transfer (SWIPT) has recently attracted a great deal of attention for providing wireless energy to communication devices. This paper proposes a novel receiver mode switching scheme for SWIPT and the enabling transmitter...

    Provided By National University of Singapore

  • White Papers // Feb 2013

    MIMO Broadcasting for Simultaneous Wireless Information and Power Transfer

    Wireless Energy Transfer (WET) is a promising technology to provide virtually perpetual energy supplies to wireless networks. Generally speaking, WET is implementable by either the "Near-field" ElectroMagnetic (EM) induction or the "Far-field" EM radiation, for short and long range applications, respectively. In this paper, the latter case in the particular...

    Provided By National University of Singapore

  • White Papers // Jan 2013

    Energy Cooperation in Cellular Networks With Renewable Powered Base Stations

    In this paper, the authors propose a model for energy cooperation between cellular Base Stations (BSs) with individual renewable energy sources, limited energy storages and connected by resistive power lines for energy sharing. When the renewable energy profile and energy demand profile at all BSs are deterministic or known ahead...

    Provided By National University of Singapore

  • White Papers // Sep 2012

    Cognitive Energy Harvesting and Transmission From a Network Perspective

    Wireless networks can be self-sustaining by harvesting energy from Radio-Frequency (RF) signals. Building on classic cognitive radio networks, the authors propose a novel method for network coexisting where mobiles from a secondary network, called Secondary Transmitters (STs), either harvest energy from transmissions by nearby transmitters from a primary network, called...

    Provided By National University of Singapore

  • White Papers // Feb 2013

    Opportunistic Wireless Energy Harvesting in Cognitive Radio Networks

    Wireless networks can be self-sustaining by harvesting energy from ambient Radio-Frequency (RF) signals. Recently, researchers have made progress on designing efficient circuits and devices for RF energy harvesting suitable for low-power wireless applications. Motivated by this and building upon the classic Cognitive Radio (CR) network model, this paper proposes a...

    Provided By National University of Singapore

  • White Papers // Mar 2013

    Multiuser MISO Beamforming for Simultaneous Wireless Information and Power Transfer

    In this paper, the authors study a multiuser Multiple-Input Single-Output (MISO) broadcast system for Simultaneous Wireless Information and Power Transfer (SWIPT), where a multi-antenna Access Point (AP) sends information and energy simultaneously via beam-forming to multiple single-antenna receivers. They maximize the weighted sum-power transferred to Energy Harvesting (EH) receivers subject...

    Provided By National University of Singapore

  • White Papers // Jul 2012

    On Capacity and Optimal Scheduling for the Half-Duplex Multiple-Relay Channel

    The authors study the Half-Duplex Multiple-Relay Channel (HD-MRC) where every node can either transmit or listen but cannot do both at the same time. They obtain a capacity upper bound based on a max-flow min-cut argument and achievable transmission rates based on the Decode-Forward (DF) coding strategy, for both the...

    Provided By National University of Singapore

  • White Papers // Dec 2008

    Achievable Rates and Schedules for Half Duplex Phase Fading Multiple-Relay Networks

    The authors present part of their work on the capacity upper bound, achievable rates, and scheduling for the Half Duplex Multiple-Relay Channel (HD MRC) where every node can either transmit or listen, but not both, at any time. They derive a capacity upper bound based on the cut-set argument, and...

    Provided By National University of Singapore

  • White Papers // Mar 2013

    CoMP Meets Energy Harvesting: A New Communication and Energy Cooperation Paradigm

    In this paper, the authors investigate joint communication and energy cooperation in cellular networks for the Coordinated Multi-Point (CoMP) downlink transmission with Base Stations (BSs) powered by renewable energy. For the purpose of exposition, they consider a simplified CoMP model with two BSs cooperatively serving two Mobile Stations (MSs), where...

    Provided By National University of Singapore

  • White Papers // May 2013

    Efficient Routing on Multilayered Communication Networks

    The authors study the optimal routing on multilayered communication networks, which are composed of two layers of sub-networks. One is a wireless network, and the other is a wired network. They develop a simple recurrent algorithm to find an optimal routing on this kind of multilayered network, where the single-channel...

    Provided By National University of Singapore

  • White Papers // Dec 2012

    A Preference Model for Deciding the Market Share of Network Service Providers

    Started with a single best-effort service, the Internet has evolved to an ecosystem where different Service Providers (SPs), e.g., Internet Service Providers (ISPs) and Content Distribution Networks (CDNs) provide different types of services, e.g., IP transit and content caching/distribution. In this paper, the authors propose a preference model on how...

    Provided By National University of Singapore

  • White Papers // Feb 2013

    Splash: Fast Data Dissemination With Constructive Interference in Wireless Sensor Networks

    It is well-known that the time taken for disseminating a large data object over a wireless sensor network is dominated by the overhead of resolving the contention for the underlying wireless channel. In this paper, the authors propose a new dissemination protocol called Splash that eliminates the need for contention...

    Provided By National University of Singapore

  • White Papers // Jul 2011

    A Performance Study of Peer-assisted File Distribution with Heterogeneous Swarms

    Peer-to-peer file-sharing protocols, such as BitTorrent, have been widely used to improve the performance and scalability of file distribution systems. In this paper, the authors study the performance of peer-assisted file distribution systems with heterogeneous peers. Based on a measurement study of BitTorrent on PlanetLab, they made two key observations:...

    Provided By National University of Singapore

  • White Papers // May 2011

    Efficient Error Estimating Coding: Feasibility and Applications

    Motivated by recent emerging systems that can leverage partially correct packets in wireless networks, this paper proposes the novel concept of Error Estimating Coding (EEC). Without correcting the errors in the packet, EEC enables the receiver of the packet to estimate the packet's bit error rate, which is perhaps the...

    Provided By National University of Singapore

  • White Papers // May 2012

    The Sender-Excited Secret Key Agreement Model: Capacity, Reliability and Secrecy Exponents

    The authors consider the fundamental limits of the secret key generation problem when the sources are randomly excited by the sender and there is a noiseless public discussion channel. In many practical communication settings, the sources or channels may be influenced by some parties involved. Similar to recent works on...

    Provided By National University of Singapore

  • White Papers // May 2013

    Converse Bounds for Assorted Codes in the Finite Blocklength Regime

    The authors study converse bounds for unequal error protection codebooks with k > 1 different classes of codewords. They dub these unequal error protection codes "Assorted codes". They extend a finite blocklength converse bound due to Polyanskiy-Poor-Verdu to apply to assorted codes and use this extension to obtain a refined...

    Provided By National University of Singapore

  • White Papers // May 2013

    On the Dispersions of the Discrete Memoryless Interference Channel

    In this paper, achievable dispersions for the Discrete Memoryless Interference Channel (DM-IC) are derived. In other words, they characterize the backoff from the Han-Kobayashi (HK) achievable region, the largest inner bound known to date for the DM-IC. In addition, they also characterize the backoff from Sato's region in the strictly...

    Provided By National University of Singapore

  • White Papers // Apr 2013

    A Formula for the Capacity of the General Gelfand-Pinsker Channel

    The authors consider the Gel'fand-Pinsker problem in which the channel and state are general, i.e., possibly non-stationary, non-memoryless and non-ergodic. Using the information spectrum method and a non-trivial modification of the piggyback coding lemma by Wyner, they prove that the capacity can be expressed as an optimization over the difference...

    Provided By National University of Singapore

  • White Papers // Nov 2012

    The Stream Cipher Core of the 3GPP Encryption Standard 128-EEA3: Timing Attacks and Countermeasures

    The core of the 3rd Generation Partnership Project (3GPP) encryption standard 128-EEA3 is a stream cipher called ZUC. It was designed by the Chinese Academy of Sciences and proposed for inclusion in the cellular wireless standards called "Long Term Evolution" or "4G". The LFSR-based cipher uses a 128-bit key. In...

    Provided By National University of Singapore

  • White Papers // Sep 2010

    Empirical Modeling of a Solar-Powered Energy Harvesting Wireless Sensor Node for Time-Slotted Operation

    Energy Harvesting Wireless Sensor Networks (EHWSNs) are gaining importance in smart homes, environmental monitoring, health care and transportation systems, since they enable much longer operation time as energy can be replenished through energy harvesting. This is unlike WSN nodes that use non-rechargeable batteries which need to be replaced once energy...

    Provided By National University of Singapore

  • White Papers // Jun 2010

    Transmission Power Control in 2-D Wireless Sensor Networks Powered by Ambient Energy Harvesting

    The authors are witnessing pervasive use of Wireless Sensor Networks (WSN)s in a wide variety of applications such as monitoring of road infrastructure. As they are expected to be deployed in harsh environments for long durations, the research community have turned their attention to tapping on ambient energy to power...

    Provided By National University of Singapore

  • White Papers // Feb 2010

    Wireless Sensor Networks Powered by Ambient Energy Harvesting: An Empirical Characterization

    Wireless Sensor Networks Powered by Ambient Energy Harvesting (WSN-HEAP) can perform the task of continuous and remote monitoring of the environment without the need for replacement of batteries. The authors identify three important design considerations for wireless networking protocols in WSNHEAP: the unpredictable energy supply, the propagation losses in different...

    Provided By National University of Singapore

  • White Papers // Sep 2010

    A Robust Multihop Underwater Network for Sensing Applications - Implementation and Experimental Evaluation

    Various novel applications of underwater acoustic sensor networks have emerged or been proposed in recent years. In this paper, the authors present a complete system implementation of a robust multi-hop underwater network for sensing applications. At the core of the system is a robust data delivery scheme which uses opportunistic...

    Provided By National University of Singapore

  • White Papers // Feb 2010

    A Wide Coverage Positioning System (WPS) for Underwater Localization

    Underwater localization is challenging as its efficacy is affected by propagation delays, motion-induced doppler shift, phase and amplitude fluctuations, multipath interference etc that are inherent in underwater acoustic channels. In this paper, the authors consider a recently proposed Underwater Positioning Scheme, which offers unique localization only in a finite region....

    Provided By National University of Singapore

  • White Papers // Apr 2012

    Signal Processing for MIMO Interference Networks

    Multiple antennas, when used at both the transmitter and the receiver, create a Multiple-Input Multiple-Output (MIMO) propagation channel. Using sophisticated coding at the transmitter and substantial signal processing at the receiver, the MIMO channel can be provisioned for higher data rates, resistance to multipath fading, lower delays, and support for...

    Provided By National University of Singapore

  • White Papers // Apr 2012

    A Robust Indoor Pedestrian Tracking System with Sparse Infrastructure Support

    Existing approaches to indoor tracking have various limitations. Location-fingerprinting approaches are labor intensive and vulnerable to environmental changes. Trilateration approaches require at least three Line-of-Sight beacons for coverage at any point in the service area, which results in heavy infrastructure cost. Dead Reckoning (DR) approaches rely on knowledge of the...

    Provided By National University of Singapore

  • White Papers // Jul 2011

    Joint Time and Spatial Reuse Handshake Protocol for Underwater Acoustic Communication Networks

    In most existing handshake-based collision avoidance protocols, nodes in the proximity of the transmitter or receiver are kept silent during an ongoing communication session. In this paper, the authors utilize the long propagation delay in the underwater acoustic channel and the (possible) sparsity of the network topology to increase network...

    Provided By National University of Singapore

  • White Papers // Jul 2010

    A Study on Network Coding in Underwater Networks

    In this paper, the performance of network coding in underwater acoustic networks is evaluated. This paper is to determine the suitability of using network coding for error recovery in the high error rate underwater acoustic channel; and if so, what parameter settings should be used for a given network so...

    Provided By National University of Singapore

  • White Papers // Jun 2013

    Energy-Aware Dynamic Reconfiguration of Communication-Centric Applications for Reliable MPSoCs

    To accommodate the ever increasing demands of applications and for the ease of scalability, Multi-Processor system-on-chips (MPSoCs) are becoming a popular design choice in current and future technologies with streaming multimedia and other communication-centric applications constituting a large fraction of the application space. Mapping and scheduling of these applications on...

    Provided By National University of Singapore

  • White Papers // Dec 2012

    Communication and Migration Energy Aware Design Space Exploration for Multicore Systems with Intermittent Faults

    Shrinking feature-size and growing transistor density are negatively impacting the dependability of Multi-Processor System-on-Chips (MPSoCs) by increasing the chances of faults (permanent, intermittent and transient). Recently, intermittent device defects are gaining significant attention among research community. These are a class of hardware faults occurring frequently but irregularly over a period...

    Provided By National University of Singapore

  • White Papers // Nov 2012

    TRISHUL: A Single-Pass Optimal Two-Level Inclusive Data Cache Hierarchy Selection Process for Real-Time MPSoCs

    Hitherto discovered approaches analyze the execution time of a real-time application on all the possible cache hierarchy setups to find the application specific optimal two-level inclusive data cache hierarchy to reduce cost, space and energy consumption while satisfying the time deadline in real-time Multi-Processor Systems-on-Chip (MPSoC). This brute-force like approaches...

    Provided By National University of Singapore

  • White Papers // Oct 2012

    Energy-Aware Communication and Remapping of Tasks for Reliable Multimedia Multiprocessor Systems

    Shrinking transistor geometries, aggressive voltage scaling and higher operating frequencies have negatively impacted the dependability of embedded Multi-Processor System-on-Chips (MPSoCs). Fault-tolerance and energy efficiency are the two most desired features of modern day MPSoCs. For most of the multimedia applications, task communication energy constitutes more than 40% of the overall...

    Provided By National University of Singapore

  • White Papers // Aug 2012

    Fault-Aware Task Re-Mapping for Throughput Constrained Multimedia Applications on NoC-Based MPSoCs

    Shrinking transistor geometry and aggressive voltage scaling are leading to growing concerns on the reliability of multiprocessor systems. Majority of streaming multimedia applications are characterized by fixed throughput requirements; violation of which directly impacts user experience. None of the prior research considers joint treatment of throughput and task-migration overhead, both...

    Provided By National University of Singapore

  • White Papers // Aug 2012

    A Design Flow for Partially Reconfigurable Heterogeneous Multi-Processor Platforms

    Modern Multi-Processor System-on-Chips (MPSoCs) are expected to handle multi-application use cases. As the number and complexity of these applications scale, resource allocation to meet the application throughput requirement is becoming quite a challenge. In this paper, a complete design flow is proposed for partially reconfigurable heterogeneous MPSoC platforms. The proposed...

    Provided By National University of Singapore

  • White Papers // Jun 2012

    Minimizing Power Consumption of Spatial Division Based Networks-on-Chip Using Multi-Path and Frequency Reduction

    With an increasing number of processing elements being integrated on a single die, Network-on-Chips (NoCs) are emerging as a significant contributor to overall chip power consumption. While some solutions have been proposed to reduce this power consumption, none of them can be applied to Spatial Division Multiplexing (SDM)-based NoCs. In...

    Provided By National University of Singapore

  • White Papers // Jun 2012

    An Area-Efficient Partially Reconfigurable Crossbar Switch with Low Reconfiguration Delay

    With the increasing number of processors in Multi-Processor System-on-Chips (MPSoCs), Network-on-Chips (NoCs) are replacing conventional buses as the interprocessor communication architecture. Since different use cases might be running on MPSoCs, there is a need for dynamically reconfigurable NoC. However, most dynamically reconfigurable NoCs have a large area overhead due to...

    Provided By National University of Singapore

  • White Papers // Jul 2012

    Acceleration of Distance-to-Default with Hardware-Software Co-Design

    The role of credit rating agencies has come under intense scrutiny in the recent past due to their failure to accurately rate the issuers of debt obligations and instruments. With growing uncertainty in the markets and the need for accurate results, credit rating algorithms are getting more and more complex...

    Provided By National University of Singapore

  • White Papers // Jun 2012

    Fault-Tolerant Network Interface for Spatial Division Multiplexing Based Network-on-Chip

    The progressive maturity of VLSI manufacturing technology is helping in integrating more and more processing elements and memory units on a single die to form a Multi-Processor System-On-Chip (MPSoC). Network-on-Chip (NoC) is adopted as communication backbone for most of these modern day multiprocessor systems. As complexity of these system scales,...

    Provided By National University of Singapore