Politecnico di Milano

Displaying 1-40 of 52 results

  • White Papers // Jan 2013

    PoliSave: Efficient Power Management of Campus PCs

    In this paper, the authors study the power consumption of networked devices in a large Campus network, focusing mainly on PC usage. They first define a methodology to monitor host power state, which they then apply to their Campus network. Results show that typically people refrain from turning off their...

    Provided By Politecnico di Milano

  • White Papers // Nov 2012

    On-Line Power Savings in a Distributed Multi-Stage Router Architecture

    The authors focus on a distributed Multi-Stage Software Router (MSSR) architecture internally composed by several Personal Computers (PCs) to overcome scalability and performance issues of Software Routers (SRs) based on a single PC. Sizing the internal architecture to sustain the peak load may lead to power inefficiency at low loads....

    Provided By Politecnico di Milano

  • White Papers // Nov 2012

    Exploiting Space Diversity and Dynamic Voltage Frequency Scaling in Multiplane Network-on-Chips

    Network-on-Chips (NoCs) have been proposed as a scalable solution to interconnect multiple components on a silicon chip. In this paper, the authors approach NoCs power optimization through Dynamic Voltage and Frequency Scaling (DVFS) under the hypothesis that two NoC planes are available, each with a different voltage supply and clock...

    Provided By Politecnico di Milano

  • White Papers // Aug 2012

    On the Effectiveness of Sleep Modes in Backbone Networks With Limited Configurations

    The authors study the problem of putting in sleep mode devices of a backbone network, while limiting the number of times each device changes its power state (full power mode or sleep mode). Their aim is to limit the number of network configurations, i.e., the change of the current set...

    Provided By Politecnico di Milano

  • White Papers // Jun 2012

    Multiple Daily Base Station Switch-Offs in Cellular Networks

    In this paper, the authors study base station sleep modes, which are today considered a viable approach to improve the energy efficiency of cellular access networks, by reducing power consumption in periods of low traffic. When some base stations are switched off, radio coverage and service provisioning are taken care...

    Provided By Politecnico di Milano

  • White Papers // Jun 2012

    EWA: An Adaptive Algorithm for Energy Saving in IP-Over-WDM Networks

    The authors propose Energy Watermark Algorithm (EWA), an adaptive algorithm to reduce power consumption in Internet Protocol (IP)-over-Wavelength Division Multiplexing (WDM) networks. Their solution wisely adapts the set of powered on line cards to the actual traffic demand. In particular, EWA trades between network power consumption and Quality of Service...

    Provided By Politecnico di Milano

  • White Papers // May 2012

    Efficient Multistriding of Large Non-Deterministic Finite State Automata for Deep Packet Inspection

    Multistride automata speed up input matching because each multistriding transformation halves the size of the input string, leading to a potential 2x speedup. However, up to now little effort has been spent in optimizing the building process of multistride automata, with the result that current algorithms cannot be applied to...

    Provided By Politecnico di Milano

  • White Papers // May 2012

    Analog Digital Belief Propagation: From Theory to Practice

    The authors introduce a novel message passing (BP) algorithm, named Analog-Digital Belief Propagation (ADBP). The algorithm works with factor graph over linear models and uses messages in a particular class of parameterized Gaussian-like distributions by tracking their parameters. With respect to the regular Gaussian BP, this algorithm adds two operations...

    Provided By Politecnico di Milano

  • White Papers // May 2012

    Energy Saving in Distributed Router Architectures

    A multi-stage software router overcomes scalability issues related to a single, PC-based, software router by introducing parallel forwarding paths. However, since the architecture includes different internal components, energy inefficiency at low loads may arise if the multi-stage internal architecture does not adapt to currently offered traffic. This paper presents an...

    Provided By Politecnico di Milano

  • White Papers // May 2012

    Spectral Efficiency of Linear and Continuous Phase Modulations Over Nonlinear Satellite Channels

    The authors consider a frequency-division-multiplexed satellite system where nonlinear distortions may originate from the presence of high power nonlinear devices and can cause significant performance degradations. The spectral efficiency is used as a performance measure to compare, from an information theoretic point of view, different transmission strategies and modulation formats....

    Provided By Politecnico di Milano

  • White Papers // Apr 2012

    Formally Based Semi-Automatic Implementation of an Open Security Protocol

    In this paper, the authors present an experiment in which an implementation of the client side of the SSH Transport Layer Protocol (SSH-TLP) was semi-automatically derived according to a model-driven development paradigm that leverages formal methods in order to obtain high correctness assurance. The approach used in the experiment starts...

    Provided By Politecnico di Milano

  • White Papers // Mar 2012

    Drop the Phone and Talk to the Physical World: Programming the Internet of Things With Erlang

    The authors present ELIOT, an Erlang-based development framework expressly conceived for heterogeneous and massively decentralized sensing/actuation systems: a vision commonly regarded as the "Internet of Things". They choose Erlang due to the functional high-level programming model and the native support for concurrency and distributed programming. Both are assets when developing...

    Provided By Politecnico di Milano

  • White Papers // Mar 2012

    DSOL: A Declarative Approach to Self-Adaptive Service Orchestrations

    Service Oriented Computing (SOC) has brought a simplification in the way distributed applications can be built. Mainstream approaches, however, failed to support dynamic, self-managed compositions that would empower even non-technical users to build their own orchestrations. Indeed, because of the changeable world in which they are embedded, service compositions must...

    Provided By Politecnico di Milano

  • White Papers // Feb 2012

    A Truthful Auction for Access Point Selection in Heterogeneous Mobile Networks

    In recent years, with the evolution of new and content-rich Internet services, mobile network operators face the challenging task to guarantee ubiquitous access to their customers, while minimizing network deployment costs. In order to foster the opportunistic utilization of unexploited Internet connections of residential users, the authors propose a new...

    Provided By Politecnico di Milano

  • White Papers // Dec 2011

    Low Latency Complex Event Processing on Parallel Hardware

    Most complex information systems are event-driven: each part of the system reacts to the events happening in the other parts, potentially generating new events. Complex Event Processing (CEP) engines in charge of interpreting, filtering, and combining primitive events to identify higher level composite events according to a set of rules,...

    Provided By Politecnico di Milano

  • White Papers // Nov 2011

    An Application Specific Instruction Set Processor Based Implementation for Signal Detection in Multiple Antenna Systems

    Most of known sphere decoders have been implemented as Application Specific Integrated Circuits (ASICs), but the need for high degree of flexibility in MIMO detection makes interesting also Application Specific Instruction set Processor (ASIP) implementations. A single programmable ASIP can hardly reach the same processing speed as a fully dedicated...

    Provided By Politecnico di Milano

  • White Papers // Sep 2011

    Shellzer: A Tool for the Dynamic Analysis of Malicious Shellcode

    Shellcode is malicious binary code whose execution is triggered after the exploitation of a vulnerability. The automated analysis of malicious shellcode is a challenging task, since encryption and evasion techniques are often used. This paper introduces Shellzer, a novel dynamic shellcode analyzer that generates a complete list of the API...

    Provided By Politecnico di Milano

  • White Papers // Aug 2011

    An Energy and Memory-Efficient Key Management Scheme for Mobile Heterogeneous Sensor Networks

    Wireless Sensor Network (WSN) technology is being increasingly adopted in a wide variety of applications ranging from home/building and industrial automation to more safety critical applications including e-health or infrastructure monitoring. Considering mobility in the above application scenarios actually introduces additional technological challenges, especially with respect to security. The resource...

    Provided By Politecnico di Milano

  • White Papers // Apr 2011

    A Framework for QoS-Aware Execution of Workflows Over the Cloud

    The Cloud Computing paradigm is providing system architects with a new powerful tool for building scalable applications. Clouds allow allocation of resources on a "Pay-as-you-go" model, so that additional resources can be requested during peak loads and released after that. However, this flexibility asks for appropriate dynamic reconfiguration strategies. In...

    Provided By Politecnico di Milano

  • White Papers // Feb 2011

    Computational REST Meets Erlang

    Today's applications are developed in a world where the execution context changes continuously. They have to adapt to these changes at run-time if they want to offer their services without interruption. This is particularly critical for distributed Web applications, whose components run on different machines, often managed by different organizations....

    Provided By Politecnico di Milano

  • White Papers // Dec 2010

    Tree-Based Routing Protocol for Wireless Sensor Networks

    The issue of supporting mobility in Wireless Sensor Networks is recently attracting increasing attention within the research community as new-born application scenarios require the deployment of hybrid network architectures composed of fixed and mobile sensor nodes. In this paper, the authors address the problem of mobility management in WSNs by...

    Provided By Politecnico di Milano

  • White Papers // Jul 2010

    Dynamic Framed-ALOHA for Energy-Constrained Wireless Sensor Networks With Energy Harvesting

    The Dynamic Framed-ALOHA (DFA) protocol is studied for wireless sensor networks with energy limitations and energy-harvesting capability. The performance of DFA in this scenario is evaluated in terms of the time efficiency (or throughput), which is routinely used to evaluate medium access protocols, and by introducing a new metric, referred...

    Provided By Politecnico di Milano

  • White Papers // Jun 2010

    Home Energy Saving Through Wireless Sensor Networks

    This paper presents a Home Automation system based on Wireless Sensor Networks (WSN) that allows managing and saving the energy consumption of home appliances. According to recent studies energy consumptions are increasing year after year, and if effective energy saving policies will not be adopted, in 2030 they will rise...

    Provided By Politecnico di Milano

  • White Papers // Jun 2010

    A Game Theoretic Analysis of Network Design With Socially-Aware Users

    In many scenarios network design is not enforced by a central authority, but arises from the interactions of several self-interested agents. This is the case of the Internet, where connectivity is due to Autonomous Systems' choices, but also of overlay networks, where each user client can decide the set of...

    Provided By Politecnico di Milano

  • White Papers // Jun 2010

    A Wireless Sensor Network Based System for Reducing Home Energy Consumption

    In this paper, the authors present a work in progress within the European project AIM for the design of a system based on wireless sensor networks to save energy in home environments. According to recent studies energy consumptions are increasing year after year, and if effective energy saving policies will...

    Provided By Politecnico di Milano

  • White Papers // Apr 2010

    SLIM: Service Location and Invocation Middleware for Mobile Wireless Sensor and Actuator Networks

    One of the main obstacles to the adoption of Wire-less Sensor Networks (WSNs) outside the research community is the lack of high level mechanisms to easily program them. This problem affects distributed applications in general, and it has been replied by the Software Engineering community, which recently embraced Service Oriented...

    Provided By Politecnico di Milano

  • White Papers // Mar 2010

    MultiCaR: Remote Invocation for Large Scale, Context-Aware Applications

    Remote Method Invocation (RMI) provides a powerful programming abstraction, well integrated with the object-oriented paradigm. Like conventional method calls, RMI interaction is point-to-point and uses an explicit address to determine the target of invocations. While natural and easy to use, these characteristics limit the applicability of RMI in large scale,...

    Provided By Politecnico di Milano

  • White Papers // Mar 2010

    Radio Over Telephone Lines in Femtocell Systems

    Wireless over Cable (WoC) paradigm is a new technique to enable distributed antennas systems. WoC is based on the relay of radio frequency wireless signals over a cable infrastructure through a bidirectional (analog) amplify and forward device that translates the bandwidth of wireless signals to comply with the specifications of...

    Provided By Politecnico di Milano

  • White Papers // Mar 2010

    Low Voltage Fault Attacks to AES and RSA on General Purpose Processors

    Fault injection attacks have proven in recent times a powerful tool to exploit implementative weaknesses of robust cryptographic algorithms. A number of different techniques aimed at disturbing the computation of a cryptographic primitive have been devised, and have been successfully employed to leak secret information inferring it from the erroneous...

    Provided By Politecnico di Milano

  • White Papers // Feb 2010

    Energy Saving and Network Performance: A Trade-Off Approach

    Power consumption of the Information and Communication Technology sector (ICT) has recently become a key challenge. In particular, actions to improve energy-efficiency of Internet Service Providers (ISPs) are becoming imperative. To this purpose, in this paper, the authors focus on reducing the power consumption of access nodes in an ISP...

    Provided By Politecnico di Milano

  • White Papers // Feb 2010

    Loupe: Verifying Publish-Subscribe Architectures With a Magnifying Lens

    The Publish-Subscribe (P/S) communication paradigm fosters high decoupling among distributed components. This facilitates the design of dynamic applications, but also impacts negatively on their verification, making it difficult to reason on the overall federation of components. In addition, existing P/S infrastructures offer radically different features to the applications, e.g., in...

    Provided By Politecnico di Milano

  • White Papers // Jan 2010

    Using Compositionality to Formally Model and Analyze Systems Built of a High Number of Components

    When dependability of systems with a large number of components is a concern, being able to model and analyze their properties, especially non-functional ones, in a formal and automated way becomes essential. Often, however, the application of formal methods and automated reasoning is seen by practitioners as complex and time...

    Provided By Politecnico di Milano

  • White Papers // Jan 2010

    A Tile-Based Approach for Self-Assembling Service Compositions

    This paper presents a novel approach to the design of self-adaptive service-oriented applications based on a new model called service tiles. The approach allows designers to develop a service-oriented system by building an assembly of component services that accomplishes the given goal. The assembly is computed automatically starting from the...

    Provided By Politecnico di Milano

  • White Papers // Jan 2010

    Shared Protection Network Design: Valid Inequalities and a Decomposition Approach

    Shared Protection is a technique that can reduce the cost of backup resources in survivable networks, if it is suitably considered at the design level. This paper presents a model and two families of valid cut-set inequalities for this problem. Because of the computational burden brought by the problem, the...

    Provided By Politecnico di Milano

  • White Papers // Dec 2009

    C-VET the UCLA Campus Vehicular Testbed: Integration of VANET and MESH Networks

    Vehicular communications are becoming a reality under the push of increased transportation safety requirements and huge investments of several actors in the field like car manufacturers and Public Transport Authorities. As a consequence, the building blocks of the "Vehicle Grid" (radios, Access Points, spectrum, standards, etc.) will soon be in...

    Provided By Politecnico di Milano

  • White Papers // Oct 2009

    A Game Theoretic Framework for Joint Routing and Pricing in Networks With Elastic Demands

    In this paper, the authors study the economic interactions between network users and providers. Each user must ship his traffic from a source to a destination node, splitting it over multiple paths, each owned by an independent network provider. Users are charged a fixed price per unit of bandwidth used,...

    Provided By Politecnico di Milano

  • White Papers // Oct 2009

    A Cooperative Approach for Topology Control in Wireless Sensor Networks

    The choice of the transmission power levels adopted in Wireless Sensor Networks (WSNs) is critical to determine the performance of the network itself in terms of energy efficiency, connectivity and spatial reuse, since it has direct impact on the physical network topology. In this paper, a cooperative, lightweight and fully...

    Provided By Politecnico di Milano

  • White Papers // Jul 2009

    An Auction Framework for Spectrum Allocation With Interference Constraint in Cognitive Radio Networks

    Extensive research in recent years has shown the benefits of cognitive radio technologies to improve the flexibility and efficiency of spectrum utilization. This new communication paradigm, however, requires a well-designed spectrum allocation mechanism. In this paper, the authors propose an auction framework for cognitive radio networks to allow unlicensed Secondary...

    Provided By Politecnico di Milano

  • White Papers // Jul 2009

    Integrated Modeling and Verification of Real-Time Systems Through Multiple Paradigms

    In this paper, the authors present a technique to model different aspects of the same system with different formalisms, while keeping the various models tightly integrated with one another. In a multi-paradigm approach to modeling, formalisms with different natures are used in combination to describe complementary parts and aspects of...

    Provided By Politecnico di Milano

  • White Papers // Jul 2009

    Performance Evaluation of Cooperative Forwarding Schemes in Wireless Networks With General Topology and Multiple Traffic Flows: An Optimization Approach

    Cooperation schemes are the key elements of infrastructure-less wireless networks that allow nodes that cannot directly communicate to exchange information through the help of intermediate nodes that relay their messages towards destination. The most widely adopted approach is based on hop-by-hop forwarding at network layer along a path to destination....

    Provided By Politecnico di Milano

  • White Papers // Nov 2011

    An Application Specific Instruction Set Processor Based Implementation for Signal Detection in Multiple Antenna Systems

    Most of known sphere decoders have been implemented as Application Specific Integrated Circuits (ASICs), but the need for high degree of flexibility in MIMO detection makes interesting also Application Specific Instruction set Processor (ASIP) implementations. A single programmable ASIP can hardly reach the same processing speed as a fully dedicated...

    Provided By Politecnico di Milano

  • White Papers // Mar 2009

    A Self-Repairing Tree Topology Enabling Content-Based Routing in Mobile Ad Hoc Networks

    Content-Based Routing (CBR) provides a powerful and flexible foundation for distributed applications. Its communication model, based on implicit addressing, fosters decoupling among the communicating components, therefore meeting the needs of many dynamic scenarios, including Mobile Ad hoc NETworks (MANETs). Unfortunately, the characteristics of the CBR model are only rarely met...

    Provided By Politecnico di Milano

  • White Papers // Mar 2010

    Radio Over Telephone Lines in Femtocell Systems

    Wireless over Cable (WoC) paradigm is a new technique to enable distributed antennas systems. WoC is based on the relay of radio frequency wireless signals over a cable infrastructure through a bidirectional (analog) amplify and forward device that translates the bandwidth of wireless signals to comply with the specifications of...

    Provided By Politecnico di Milano

  • White Papers // Jun 2010

    A Game Theoretic Analysis of Network Design With Socially-Aware Users

    In many scenarios network design is not enforced by a central authority, but arises from the interactions of several self-interested agents. This is the case of the Internet, where connectivity is due to Autonomous Systems' choices, but also of overlay networks, where each user client can decide the set of...

    Provided By Politecnico di Milano

  • White Papers // Sep 2011

    Shellzer: A Tool for the Dynamic Analysis of Malicious Shellcode

    Shellcode is malicious binary code whose execution is triggered after the exploitation of a vulnerability. The automated analysis of malicious shellcode is a challenging task, since encryption and evasion techniques are often used. This paper introduces Shellzer, a novel dynamic shellcode analyzer that generates a complete list of the API...

    Provided By Politecnico di Milano

  • White Papers // Apr 2009

    Mashlight: A Lightweight Mashup Framework for Everyone

    Recently, Web 2.0 has brought a storm on web application development. In particular, mashups have greatly enhanced user creativity across the web, allowing end-users to rapidly combine information from diverse sources, and integrate them into "New" goal-oriented applications. In the meantime, widgets (also built with Web 2.0 technology) have also...

    Provided By Politecnico di Milano

  • White Papers // Jan 2010

    Using Compositionality to Formally Model and Analyze Systems Built of a High Number of Components

    When dependability of systems with a large number of components is a concern, being able to model and analyze their properties, especially non-functional ones, in a formal and automated way becomes essential. Often, however, the application of formal methods and automated reasoning is seen by practitioners as complex and time...

    Provided By Politecnico di Milano

  • White Papers // Jan 2010

    A Tile-Based Approach for Self-Assembling Service Compositions

    This paper presents a novel approach to the design of self-adaptive service-oriented applications based on a new model called service tiles. The approach allows designers to develop a service-oriented system by building an assembly of component services that accomplishes the given goal. The assembly is computed automatically starting from the...

    Provided By Politecnico di Milano

  • White Papers // Jul 2009

    Integrated Modeling and Verification of Real-Time Systems Through Multiple Paradigms

    In this paper, the authors present a technique to model different aspects of the same system with different formalisms, while keeping the various models tightly integrated with one another. In a multi-paradigm approach to modeling, formalisms with different natures are used in combination to describe complementary parts and aspects of...

    Provided By Politecnico di Milano

  • White Papers // Feb 2010

    Loupe: Verifying Publish-Subscribe Architectures With a Magnifying Lens

    The Publish-Subscribe (P/S) communication paradigm fosters high decoupling among distributed components. This facilitates the design of dynamic applications, but also impacts negatively on their verification, making it difficult to reason on the overall federation of components. In addition, existing P/S infrastructures offer radically different features to the applications, e.g., in...

    Provided By Politecnico di Milano

  • White Papers // Mar 2012

    Drop the Phone and Talk to the Physical World: Programming the Internet of Things With Erlang

    The authors present ELIOT, an Erlang-based development framework expressly conceived for heterogeneous and massively decentralized sensing/actuation systems: a vision commonly regarded as the "Internet of Things". They choose Erlang due to the functional high-level programming model and the native support for concurrency and distributed programming. Both are assets when developing...

    Provided By Politecnico di Milano

  • White Papers // Mar 2012

    DSOL: A Declarative Approach to Self-Adaptive Service Orchestrations

    Service Oriented Computing (SOC) has brought a simplification in the way distributed applications can be built. Mainstream approaches, however, failed to support dynamic, self-managed compositions that would empower even non-technical users to build their own orchestrations. Indeed, because of the changeable world in which they are embedded, service compositions must...

    Provided By Politecnico di Milano

  • White Papers // Dec 2011

    Low Latency Complex Event Processing on Parallel Hardware

    Most complex information systems are event-driven: each part of the system reacts to the events happening in the other parts, potentially generating new events. Complex Event Processing (CEP) engines in charge of interpreting, filtering, and combining primitive events to identify higher level composite events according to a set of rules,...

    Provided By Politecnico di Milano

  • White Papers // Apr 2010

    SLIM: Service Location and Invocation Middleware for Mobile Wireless Sensor and Actuator Networks

    One of the main obstacles to the adoption of Wire-less Sensor Networks (WSNs) outside the research community is the lack of high level mechanisms to easily program them. This problem affects distributed applications in general, and it has been replied by the Software Engineering community, which recently embraced Service Oriented...

    Provided By Politecnico di Milano

  • White Papers // Feb 2011

    Computational REST Meets Erlang

    Today's applications are developed in a world where the execution context changes continuously. They have to adapt to these changes at run-time if they want to offer their services without interruption. This is particularly critical for distributed Web applications, whose components run on different machines, often managed by different organizations....

    Provided By Politecnico di Milano

  • White Papers // Mar 2010

    MultiCaR: Remote Invocation for Large Scale, Context-Aware Applications

    Remote Method Invocation (RMI) provides a powerful programming abstraction, well integrated with the object-oriented paradigm. Like conventional method calls, RMI interaction is point-to-point and uses an explicit address to determine the target of invocations. While natural and easy to use, these characteristics limit the applicability of RMI in large scale,...

    Provided By Politecnico di Milano

  • White Papers // Feb 2012

    A Truthful Auction for Access Point Selection in Heterogeneous Mobile Networks

    In recent years, with the evolution of new and content-rich Internet services, mobile network operators face the challenging task to guarantee ubiquitous access to their customers, while minimizing network deployment costs. In order to foster the opportunistic utilization of unexploited Internet connections of residential users, the authors propose a new...

    Provided By Politecnico di Milano

  • White Papers // May 2012

    Efficient Multistriding of Large Non-Deterministic Finite State Automata for Deep Packet Inspection

    Multistride automata speed up input matching because each multistriding transformation halves the size of the input string, leading to a potential 2x speedup. However, up to now little effort has been spent in optimizing the building process of multistride automata, with the result that current algorithms cannot be applied to...

    Provided By Politecnico di Milano

  • White Papers // May 2012

    Analog Digital Belief Propagation: From Theory to Practice

    The authors introduce a novel message passing (BP) algorithm, named Analog-Digital Belief Propagation (ADBP). The algorithm works with factor graph over linear models and uses messages in a particular class of parameterized Gaussian-like distributions by tracking their parameters. With respect to the regular Gaussian BP, this algorithm adds two operations...

    Provided By Politecnico di Milano

  • White Papers // May 2012

    Energy Saving in Distributed Router Architectures

    A multi-stage software router overcomes scalability issues related to a single, PC-based, software router by introducing parallel forwarding paths. However, since the architecture includes different internal components, energy inefficiency at low loads may arise if the multi-stage internal architecture does not adapt to currently offered traffic. This paper presents an...

    Provided By Politecnico di Milano

  • White Papers // May 2012

    Spectral Efficiency of Linear and Continuous Phase Modulations Over Nonlinear Satellite Channels

    The authors consider a frequency-division-multiplexed satellite system where nonlinear distortions may originate from the presence of high power nonlinear devices and can cause significant performance degradations. The spectral efficiency is used as a performance measure to compare, from an information theoretic point of view, different transmission strategies and modulation formats....

    Provided By Politecnico di Milano

  • White Papers // Mar 2009

    Masibty: An Anomaly Based Intrusion Prevention System for Web Applications

    This paper briefly describes Masibty, a novel anomaly-based web application firewall it devised. It has a modular and extensible structure. It give an overview of the anomaly detection models it implemented in it, and show that it is able to detect different kind of real world attacks on common web...

    Provided By Politecnico di Milano

  • White Papers // Mar 2009

    Quality-And Energy-Aware Data Compression by Aggregation in WSN Data Streams

    Sensor networks consist of autonomous devices that cooperatively monitor an environment. Sensors are equipped with capabilities to store information in memory, process information and communicate with neighbors and with a base station. However, due to the sensors' size, their associated resources are limited. In such a context, the main cause...

    Provided By Politecnico di Milano

  • White Papers // Jan 2010

    Shared Protection Network Design: Valid Inequalities and a Decomposition Approach

    Shared Protection is a technique that can reduce the cost of backup resources in survivable networks, if it is suitably considered at the design level. This paper presents a model and two families of valid cut-set inequalities for this problem. Because of the computational burden brought by the problem, the...

    Provided By Politecnico di Milano

  • White Papers // Mar 2009

    A Study Of Central Auction Based Wholesale Electricity Markets

    The deregulation of electricity markets produced significant economic benefits, reducing prices to customers and opening several opportunities for new actors, e.g., new generators and distributors. A prominent scientific and technological challenge is the automation of such markets. In particular, the authors focus on wholesale electricity markets based on a central...

    Provided By Politecnico di Milano

  • White Papers // Mar 2010

    Low Voltage Fault Attacks to AES and RSA on General Purpose Processors

    Fault injection attacks have proven in recent times a powerful tool to exploit implementative weaknesses of robust cryptographic algorithms. A number of different techniques aimed at disturbing the computation of a cryptographic primitive have been devised, and have been successfully employed to leak secret information inferring it from the erroneous...

    Provided By Politecnico di Milano

  • White Papers // Dec 2008

    A Context and Content-Based Routing Protocol for Mobile Sensor Networks

    The need of monitoring people, animals, and things in general, brings to consider mobile WSNs besides traditional, fixed ones. Moreover, several advanced scenarios, like those including actuators, involve multiple sinks. Mobility and multiple sinks radically changes the way routing is performed, while the peculiarities of WSNs make it difficult to...

    Provided By Politecnico di Milano

  • White Papers // Oct 2009

    A Game Theoretic Framework for Joint Routing and Pricing in Networks With Elastic Demands

    In this paper, the authors study the economic interactions between network users and providers. Each user must ship his traffic from a source to a destination node, splitting it over multiple paths, each owned by an independent network provider. Users are charged a fixed price per unit of bandwidth used,...

    Provided By Politecnico di Milano

  • White Papers // Mar 2009

    An Adaptive Sampling Algorithm for Effective Energy Management in Wireless Sensor Networks With Energy-Hungry Sensors

    Energy conservation techniques for wireless sensor networks generally assume that data acquisition and processing have energy consumption significantly lower than that of communication. Unfortunately, this assumption does not hold in a number of practical applications, where sensors may consume even more energy than the radio. In this paper, effective energy...

    Provided By Politecnico di Milano

  • White Papers // Apr 2009

    Energy Management in Wireless Sensor Networks With Energy-Hungry Sensors

    In recent years, the number of wireless sensor network deployments for real life applications has rapidly increased. Still, the energy problem remains one of the major barrier somehow preventing the complete exploitation of this technology. Sensor nodes are typically powered by batteries with a limited lifetime and, even when additional...

    Provided By Politecnico di Milano

  • White Papers // Jul 2009

    An Auction Framework for Spectrum Allocation With Interference Constraint in Cognitive Radio Networks

    Extensive research in recent years has shown the benefits of cognitive radio technologies to improve the flexibility and efficiency of spectrum utilization. This new communication paradigm, however, requires a well-designed spectrum allocation mechanism. In this paper, the authors propose an auction framework for cognitive radio networks to allow unlicensed Secondary...

    Provided By Politecnico di Milano

  • White Papers // Jul 2009

    On Spectrum Selection Games in Cognitive Radio Networks

    Cognitive radio networks aim at enhancing spectrum utilization by allowing cognitive devices to opportunistically access vast portions of the spectrum. To reach such ambitious goal, cognitive terminals must be geared with enhanced spectrum management capabilities including the detection of unused spectrum holes (spectrum sensing), the characterization of available bands (spectrum...

    Provided By Politecnico di Milano

  • White Papers // Jul 2010

    Dynamic Framed-ALOHA for Energy-Constrained Wireless Sensor Networks With Energy Harvesting

    The Dynamic Framed-ALOHA (DFA) protocol is studied for wireless sensor networks with energy limitations and energy-harvesting capability. The performance of DFA in this scenario is evaluated in terms of the time efficiency (or throughput), which is routinely used to evaluate medium access protocols, and by introducing a new metric, referred...

    Provided By Politecnico di Milano

  • White Papers // Apr 2011

    A Framework for QoS-Aware Execution of Workflows Over the Cloud

    The Cloud Computing paradigm is providing system architects with a new powerful tool for building scalable applications. Clouds allow allocation of resources on a "Pay-as-you-go" model, so that additional resources can be requested during peak loads and released after that. However, this flexibility asks for appropriate dynamic reconfiguration strategies. In...

    Provided By Politecnico di Milano

  • White Papers // Oct 2009

    A Cooperative Approach for Topology Control in Wireless Sensor Networks

    The choice of the transmission power levels adopted in Wireless Sensor Networks (WSNs) is critical to determine the performance of the network itself in terms of energy efficiency, connectivity and spatial reuse, since it has direct impact on the physical network topology. In this paper, a cooperative, lightweight and fully...

    Provided By Politecnico di Milano

  • White Papers // Dec 2009

    C-VET the UCLA Campus Vehicular Testbed: Integration of VANET and MESH Networks

    Vehicular communications are becoming a reality under the push of increased transportation safety requirements and huge investments of several actors in the field like car manufacturers and Public Transport Authorities. As a consequence, the building blocks of the "Vehicle Grid" (radios, Access Points, spectrum, standards, etc.) will soon be in...

    Provided By Politecnico di Milano

  • White Papers // Jul 2009

    Performance Evaluation of Cooperative Forwarding Schemes in Wireless Networks With General Topology and Multiple Traffic Flows: An Optimization Approach

    Cooperation schemes are the key elements of infrastructure-less wireless networks that allow nodes that cannot directly communicate to exchange information through the help of intermediate nodes that relay their messages towards destination. The most widely adopted approach is based on hop-by-hop forwarding at network layer along a path to destination....

    Provided By Politecnico di Milano

  • White Papers // Dec 2010

    Tree-Based Routing Protocol for Wireless Sensor Networks

    The issue of supporting mobility in Wireless Sensor Networks is recently attracting increasing attention within the research community as new-born application scenarios require the deployment of hybrid network architectures composed of fixed and mobile sensor nodes. In this paper, the authors address the problem of mobility management in WSNs by...

    Provided By Politecnico di Milano

  • White Papers // Jun 2010

    A Wireless Sensor Network Based System for Reducing Home Energy Consumption

    In this paper, the authors present a work in progress within the European project AIM for the design of a system based on wireless sensor networks to save energy in home environments. According to recent studies energy consumptions are increasing year after year, and if effective energy saving policies will...

    Provided By Politecnico di Milano

  • White Papers // Jun 2010

    Home Energy Saving Through Wireless Sensor Networks

    This paper presents a Home Automation system based on Wireless Sensor Networks (WSN) that allows managing and saving the energy consumption of home appliances. According to recent studies energy consumptions are increasing year after year, and if effective energy saving policies will not be adopted, in 2030 they will rise...

    Provided By Politecnico di Milano