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Chalmers University of Technology
(65 results)-
White Papers
Mitigating Distributed Denial of Service Attacks in Multiparty Applications in the Presence of Clock Drifts
July 25, 2008, 12:00am PDT
A weak point in network-based applications is that they commonly open some known communication port(s), making themselves targets for Denial of Service (DoS) attacks. Considering adversaries that...
Provided by Chalmers University of Technology
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White Papers
A Collaborative Web Service Platform for AEC Supply Chain
June 30, 2008, 12:00am PDT
Information sharing within and across companies is crucial for an effective supply chain. For the AEC industry, however, information sharing is difficult due to the highly fragmented and...
Provided by Chalmers University of Technology
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White Papers
Decision Support for Intrusion Detection Data Collection
October 19, 2008, 12:00am PDT
Data collection is a critical but difficult activity for intrusion detection. The amount of resources that must be monitored and the rate at which events are generated makes it impossible to use...
Provided by Chalmers University of Technology
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White Papers
Simulation of MIMO Antenna Systems in Simulink and Embedded Matlab
September 12, 2008, 12:00am PDT
Multi-Input Multi-Output (MIMO) has emerged as a hot topic in wireless communications during the last decade. This is due to possible dramatic increases in reliability and capacity as compared to...
Provided by Chalmers University of Technology
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White Papers
Towards a 4G IP-Based Wireless System Proposal
January 1, 2010, 12:00am PST
A packet switched wireless cellular system with wide area coverage, high throughput and high spectral efficiency is proposed. Smart antennas at both base stations and mobiles improve the antenna...
Provided by Chalmers University of Technology
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White Papers
Analysis of Internet Backbone Traffic and Header Anomalies Observed
August 23, 2007, 12:00am PDT
The dominating Internet protocols, IP and TCP, allow some flexibility in implementation, including a variety of optional features. To support research and further development of these protocols,...
Provided by Chalmers University of Technology
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White Papers
Global Scheduling of Multi-Mode Real-Time Applications Upon Multiprocessor Platforms
February 10, 2011, 12:00am PST
Multi-mode real-time systems are those which support applications with different modes of operation, where each mode is characterized by a specific set of tasks. At run-time, such systems can, at...
Provided by Chalmers University of Technology
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White Papers
A full-Custom ASIC Design of a 8-bit, 25 MHz, Pipeline ADC Using 0.35 um CMOS technology
November 8, 2010, 12:00am PST
The purpose of this project was to design and implement a pipeline Analog-to-Digital Converter using 0.35um CMOS technology. Initial requirements of a 25-MHz conversion rate and 8-bits of...
Provided by Chalmers University of Technology
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White Papers
Non-Uniform Sampling and Reconstruction of Multi-Band Signals and Its Application in Wideband Spectrum Sensing of Cognitive Radio
July 30, 2010, 12:00am PDT
Sampling theories lie at the heart of signal processing devices and communication systems. To accommodate high operating rates while retaining low computational cost, efficient Analog-to Digital...
Provided by Chalmers University of Technology
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White Papers
The Initial Formation Of Business Networks: How To Capture The Process Of Strategising
August 28, 2010, 12:00am PDT
This paper discusses how network pictures can be used as a methodological tool to capture the process of strategising over time. The aim of this paper is to identify ways to capture the process of...
Provided by Chalmers University of Technology
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White Papers
Opening Windows To Inter-Firm Change Processes - Tracing The Beginning Of A Process
August 29, 2010, 12:00am PDT
The focus of this paper is on change processes in interfirm relationships, and specifically on the beginning of the process. The purpose is to present methodological tools to trace the beginning...
Provided by Chalmers University of Technology
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White Papers
The Importance Of Linking Internal And External Supply Side Organising - Purchasing Transformation In The Service Sector
August 27, 2010, 12:00am PDT
In response to the changing role of purchasing, companies are reorganising their purchasing function. Increasingly purchasing is becoming important for value generating purposes as a complement to...
Provided by Chalmers University of Technology
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White Papers
Product Recovery In Networks
September 4, 2010, 12:00am PDT
This paper deals with product recovery. Especially the paper sets out to scrutinize the organization of product recovery starting with firms who want to 'Get rid of' obsolete products, followed by...
Provided by Chalmers University of Technology
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White Papers
Adaptation Chains In Triadic Relationship Settings - A Case Study Of A Travel Management Process
August 28, 2010, 12:00am PDT
The focus of this paper is on adaptation processes within triadic relationship settings, which consists of an organizational buyer, and its travel agency and service supplier partners (2 airline...
Provided by Chalmers University of Technology
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White Papers
Dynamic Vs. Static Flow-Sensitive Security Analysis
May 4, 2010, 12:00am PDT
This paper seeks to answer fundamental questions about trade-offs between static and dynamic security analysis. It has been previously shown that flow-sensitive static information-flow analysis is...
Provided by Chalmers University of Technology
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White Papers
Securing Timeout Instructions in Web Applications
April 29, 2009, 12:00am PDT
Timeout mechanisms are a useful feature for web applications. However, these mechanisms need to be used with care because, if used as-is, they are vulnerable to timing attacks. This paper focuses...
Provided by Chalmers University of Technology
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Whitepapers
A Comparison of Alternative Audit Sources for Web Server Attack Detection
February 14, 2009, 12:00am PST
Most intrusion detection systems available today are using a single audit source for detecting all attacks, even though attacks have distinct manifestations in different parts of the system. In...
Provided by Chalmers University of Technology
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Whitepapers
Sum Rate Analysis of ZF Receivers in Distributed MIMO Systems With Rayleigh/Lognormal Fading
May 24, 2012, 12:00am PDT
This paper presents a detailed sum rate characterization of distributed multiple-input multiple-output systems operating over composite fading channels and employing linear zero-forcing receivers....
Provided by Chalmers University of Technology
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Whitepapers
Estimation of Synchronization Parameters in AF Cooperative Networks
May 24, 2012, 12:00am PDT
In cooperative networks, Multiple Carrier Frequency Offsets (MCFOs) and Multiple Timing Offsets (MTOs) originate due to multiple distributed nodes. In this paper, algorithms for joint estimation...
Provided by Chalmers University of Technology
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Whitepapers
Sub-Sampled OFDM Based Sub-Band Ultra-Wideband System
May 24, 2012, 12:00am PDT
In Sub-band Ultra-WideBand (SUWB) systems, the use of spreading codes in conjunction with sub-banding enables energy efficient reduced sampling rate receiver designs. In this work, the Orthogonal...
Provided by Chalmers University of Technology
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Whitepapers
Variational Bayesian Framework for Receiver Design in the Presence of Phase Noise in MIMO Systems
March 12, 2012, 12:00am PDT
In this paper, the problem of receiver design for phase noise estimation and data detection in the presence of oscillator phase noise in a point-to-point Multiple-Input Multiple-Output (MIMO)...
Provided by Chalmers University of Technology
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Whitepapers
Two-Level HARQ for Turbo Coded Cooperation: System Retransmission Gain and Optimal Time Allocation
March 12, 2012, 12:00am PDT
Hybrid Automatic Repeat reQuest (HARQ) is a well-known technique for improving system throughput and link performance of wireless communication systems, including cooperative communication...
Provided by Chalmers University of Technology
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Whitepapers
B-IFDMA - A Power Efficient Multiple Access Scheme for Non-Frequency-Adaptive Transmission
January 1, 2012, 12:00am PST
Within the EU FP6 Integrated Projects WINNER and WINNER II, multiple access schemes for frequency-adaptive and non-frequency-adaptive transmission for a future broadband mobile wireless system are...
Provided by Chalmers University of Technology
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Whitepapers
Off the Wall: Lightweight Distributed Filtering to Mitigate Distributed Denial of Service Attacks
July 20, 2012, 12:00am PDT
Distributed Denial of Service (DDoS) attacks are hard to deal with, due to the fact that it is difficult to distinguish legitimate traffic from malicious traffic, especially since the latter is...
Provided by Chalmers University of Technology
-
Whitepapers
Self-Stabilizing (k,r)-Clustering in Clock Rate-Limited Systems
September 11, 2012, 12:00am PDT
Wireless ad-hoc networks are distributed systems that often reside in error-prone environments. Self-stabilization lets the system recover autonomously from an arbitrary system state, making the...
Provided by Chalmers University of Technology
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Whitepapers
An Evaluation of Community Detection Algorithms on Large-Scale Email Traffic
March 24, 2012, 12:00am PDT
Community detection algorithms are widely used to study the structural properties of real-world networks. In this paper, the authors experimentally evaluate the qualitative performance of several...
Provided by Chalmers University of Technology
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Whitepapers
Towards Modeling Legitimate and Unsolicited Email Traffic Using Social Network Properties
May 14, 2012, 12:00am PDT
Identifying unsolicited email based on their network-level behavior rather than their content have received huge interest. In this paper, the authors investigate the social network properties of...
Provided by Chalmers University of Technology
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Whitepapers
Remote Control of Smart Meters: Friend or Foe?
August 25, 2011, 12:00am PDT
The traditional electrical grid is transitioning into the smart grid. New equipment is being installed to simplify the process of monitoring and managing the grid, making the system more...
Provided by Chalmers University of Technology
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Whitepapers
Mapping Systems Security Research at Chalmers
June 13, 2011, 12:00am PDT
At the department of Computer Science and Engineering at Chalmers University, there is a long tradition of research in systems security. More than two decades ago, the authors started to look at...
Provided by Chalmers University of Technology
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Whitepapers
Tracking Malicious Hosts on a 10Gbps Backbone Link
November 15, 2010, 12:00am PST
The authors use anonymized flow data collected from a 10Gbps backbone link to discover and analyze malicious flow patterns. Even though such data may be rather difficult to interpret, they show...
Provided by Chalmers University of Technology
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White Papers
Safe Wrappers and Sane Policies for Self Protecting JavaScript
November 16, 2010, 12:00am PST
The author describe a method for wrapping built-in methods of JavaScript programs in order to enforce security policies. The method is appealing because it requires neither deep transformation of...
Provided by Chalmers University of Technology
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White Papers
Implementing Erasure Policies Using Taint Analysis
November 15, 2010, 12:00am PST
Security or privacy-critical applications often require access to sensitive information in order to function. But in accordance with the principle of least privilege - or perhaps simply for legal...
Provided by Chalmers University of Technology
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White Papers
Specification and Verification of Side Channel Declassification
October 13, 2009, 12:00am PDT
Side channel attacks have emerged as a serious threat to the security of both networked and embedded systems - in particular through the implementations of cryptographic operations. Side channels...
Provided by Chalmers University of Technology
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White Papers
A User Model for Information Erasure
August 27, 2009, 12:00am PDT
The authors studied a notion of information erasure for systems which receive secrets intended for limited-time use. Erasure demands that once a secret has fulfilled its purpose the subsequent...
Provided by Chalmers University of Technology
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White Papers
Just Forget It: The Semantics and Enforcement of Information Erasure
April 29, 2008, 12:00am PDT
There are many settings in which sensitive information is made available to a system or organisation for a specific purpose, on the understanding that it will be erased once that purpose has been...
Provided by Chalmers University of Technology
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White Papers
Termination-Insensitive Noninterference Leaks More Than Just a Bit
August 12, 2008, 12:00am PDT
The authors have argued that in the presence of output, justifications of Denning-style analyses based on claims that they leak "Just a bit" are at best misleading. They have presented the first...
Provided by Chalmers University of Technology
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White Papers
A Theorem Proving Approach to Analysis of Secure Information Flow
January 1, 2011, 12:00am PST
Most attempts at analysing secure information flow in programs are based on domain-specific logics. Though computationally feasible, these approaches suffer from the need for abstraction and the...
Provided by Chalmers University of Technology
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White Papers
Mutual Information Statistics and Beamforming Performance Analysis of Optimized LoS MIMO Systems
June 21, 2010, 12:00am PDT
This paper provides a systematic Mutual Information (MI) and Multichannel BeamForming (MBF) characterization of optimized multiple-input multiple-output (MIMO) communication systems operating in...
Provided by Chalmers University of Technology
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White Papers
The Mobile Broadband and Fixed Broadband Battle in Swedish Market: Exploring Complementary or Substitution
September 15, 2010, 12:00am PDT
The Mobile BroadBand (MBB) in Swedish market has become a more attractive opportunity for service providers, with growing demand for ubiquitous broadband connectivity after the mobile operators...
Provided by Chalmers University of Technology
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White Papers
Hybrid GNSS-Terrestrial Cooperative Positioning Via Distributed Belief Propagation
July 27, 2010, 12:00am PDT
Cooperative positioning algorithms have been recently introduced to overcome the limitations of traditional methods, relying on GNSS or other terrestrial infrastructure. In particular, SPAWN...
Provided by Chalmers University of Technology
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Whitepapers
Tracking Malicious Hosts on a 10Gbps Backbone Link
November 15, 2010, 12:00am PST
The authors use anonymized flow data collected from a 10Gbps backbone link to discover and analyze malicious flow patterns. Even though such data may be rather difficult to interpret, they show...
Provided by Chalmers University of Technology
-
Whitepapers
Mapping Systems Security Research at Chalmers
June 13, 2011, 12:00am PDT
At the department of Computer Science and Engineering at Chalmers University, there is a long tradition of research in systems security. More than two decades ago, the authors started to look at...
Provided by Chalmers University of Technology
-
Whitepapers
Remote Control of Smart Meters: Friend or Foe?
August 25, 2011, 12:00am PDT
The traditional electrical grid is transitioning into the smart grid. New equipment is being installed to simplify the process of monitoring and managing the grid, making the system more...
Provided by Chalmers University of Technology
-
Whitepapers
Towards Modeling Legitimate and Unsolicited Email Traffic Using Social Network Properties
May 14, 2012, 12:00am PDT
Identifying unsolicited email based on their network-level behavior rather than their content have received huge interest. In this paper, the authors investigate the social network properties of...
Provided by Chalmers University of Technology
-
Whitepapers
An Evaluation of Community Detection Algorithms on Large-Scale Email Traffic
March 24, 2012, 12:00am PDT
Community detection algorithms are widely used to study the structural properties of real-world networks. In this paper, the authors experimentally evaluate the qualitative performance of several...
Provided by Chalmers University of Technology
-
Whitepapers
Self-Stabilizing (k,r)-Clustering in Clock Rate-Limited Systems
September 11, 2012, 12:00am PDT
Wireless ad-hoc networks are distributed systems that often reside in error-prone environments. Self-stabilization lets the system recover autonomously from an arbitrary system state, making the...
Provided by Chalmers University of Technology
-
Whitepapers
Off the Wall: Lightweight Distributed Filtering to Mitigate Distributed Denial of Service Attacks
July 20, 2012, 12:00am PDT
Distributed Denial of Service (DDoS) attacks are hard to deal with, due to the fact that it is difficult to distinguish legitimate traffic from malicious traffic, especially since the latter is...
Provided by Chalmers University of Technology
-
Whitepapers
B-IFDMA - A Power Efficient Multiple Access Scheme for Non-Frequency-Adaptive Transmission
January 1, 2012, 12:00am PST
Within the EU FP6 Integrated Projects WINNER and WINNER II, multiple access schemes for frequency-adaptive and non-frequency-adaptive transmission for a future broadband mobile wireless system are...
Provided by Chalmers University of Technology
-
Whitepapers
Two-Level HARQ for Turbo Coded Cooperation: System Retransmission Gain and Optimal Time Allocation
March 12, 2012, 12:00am PDT
Hybrid Automatic Repeat reQuest (HARQ) is a well-known technique for improving system throughput and link performance of wireless communication systems, including cooperative communication...
Provided by Chalmers University of Technology
-
Whitepapers
Variational Bayesian Framework for Receiver Design in the Presence of Phase Noise in MIMO Systems
March 12, 2012, 12:00am PDT
In this paper, the problem of receiver design for phase noise estimation and data detection in the presence of oscillator phase noise in a point-to-point Multiple-Input Multiple-Output (MIMO)...
Provided by Chalmers University of Technology
-
Whitepapers
Sub-Sampled OFDM Based Sub-Band Ultra-Wideband System
May 24, 2012, 12:00am PDT
In Sub-band Ultra-WideBand (SUWB) systems, the use of spreading codes in conjunction with sub-banding enables energy efficient reduced sampling rate receiver designs. In this work, the Orthogonal...
Provided by Chalmers University of Technology
-
Whitepapers
Estimation of Synchronization Parameters in AF Cooperative Networks
May 24, 2012, 12:00am PDT
In cooperative networks, Multiple Carrier Frequency Offsets (MCFOs) and Multiple Timing Offsets (MTOs) originate due to multiple distributed nodes. In this paper, algorithms for joint estimation...
Provided by Chalmers University of Technology
-
Whitepapers
Sum Rate Analysis of ZF Receivers in Distributed MIMO Systems With Rayleigh/Lognormal Fading
May 24, 2012, 12:00am PDT
This paper presents a detailed sum rate characterization of distributed multiple-input multiple-output systems operating over composite fading channels and employing linear zero-forcing receivers....
Provided by Chalmers University of Technology
-
Whitepapers
A Comparison of Alternative Audit Sources for Web Server Attack Detection
February 14, 2009, 12:00am PST
Most intrusion detection systems available today are using a single audit source for detecting all attacks, even though attacks have distinct manifestations in different parts of the system. In...
Provided by Chalmers University of Technology
-
Whitepapers
Revisiting Multi-Channel Communication to Mitigate Interference and Link Dynamics in Wireless Sensor Networks
April 8, 2012, 12:00am PDT
Multichannel communication has been proposed as alternative to adaptive (single-channel) routing protocols for mitigating the impact of interference and link dynamics in wireless sensor networks....
Provided by Chalmers University of Technology
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Whitepapers
A Metric for Opportunistic Routing in Duty Cycled Wireless Sensor Networks
June 9, 2012, 12:00am PDT
Opportunistic routing is widely known to have substantially better performance than traditional unicast routing in wireless networks with lossy links. However, wireless sensor networks are heavily...
Provided by Chalmers University of Technology
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White Papers
A Perspective on Information-Flow Control
September 28, 2011, 12:00am PDT
Information-flow control tracks how information propagates through the program during execution to make sure that the program handles the information securely. Secure information flow is comprised...
Provided by Chalmers University of Technology
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White Papers
Unifying Facets of Information Integrity
September 29, 2010, 12:00am PDT
Information integrity is a vital security property in a variety of applications. However, there is more than one facet to integrity: interpretations of integrity in different contexts include...
Provided by Chalmers University of Technology
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White Papers
Securing Interaction Between Threads and the Scheduler in the Presence of Synchronization
January 1, 2012, 12:00am PST
The problem of information flow in multithreaded programs remains an important open challenge. Existing approaches to specifying and enforcing information-flow security often suffer from...
Provided by Chalmers University of Technology
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White Papers
Implicit Flows in Malicious and Nonmalicious Code
October 12, 2009, 12:00am PDT
Information-flow technology is a promising approach for ensuring security by design and construction. When tracking information flow, of particular concern are implicit flows, i.e., flows through...
Provided by Chalmers University of Technology
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White Papers
Securing Class Initialization
March 5, 2010, 12:00am PST
Language-based information-flow security is concerned with specifying and enforcing security policies for information flow via language constructs. Although much progress has been made on...
Provided by Chalmers University of Technology
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White Papers
Multi-Run Security
June 28, 2011, 12:00am PDT
This paper explores information-flow control for batch-job programs that are allowed to be re-run with new input provided by the attacker. The authors argue that directly adapting two major...
Provided by Chalmers University of Technology
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White Papers
On-the-Fly Inlining of Dynamic Security Monitors
December 21, 2011, 12:00am PST
How do the people guarantee that a piece of code, possibly originating from third party, does not jeopardize the security of the underlying application? Language-based information-flow security...
Provided by Chalmers University of Technology
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White Papers
Decentralized Delimited Release
September 20, 2011, 12:00am PDT
Decentralization is a major challenge for secure computing. In a decentralized setting, principals are free to distrust each other. The key challenge is to provide support for expressing and...
Provided by Chalmers University of Technology
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White Papers
Securing Interactive Programs
April 12, 2012, 12:00am PDT
This paper studies the foundations of information flow security for interactive programs. Previous research assumes that the environment is total, that is, it must always be ready to feed new...
Provided by Chalmers University of Technology
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White Papers
Information-Flow Security for a Core of JavaScript
April 18, 2012, 12:00am PDT
Tracking information flow in dynamic languages remains an important and intricate problem. This paper makes substantial headway toward understanding the main challenges and resolving them. The...
Provided by Chalmers University of Technology
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White Papers
Dependently Typed Programming in Agda
October 6, 2008, 12:00am PDT
In Hindley-Milner style languages, such as Haskell and ML, there is a clear separation between types and values. In a dependently typed language the line is more blurry - types can contain (depend...
Provided by Chalmers University of Technology
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White Papers
Cache-Aware Lock-Free Queues for Multiple Producers/Consumers And Weak Memory Consistency
October 22, 2010, 12:00am PDT
A lock-free FIFO queue data structure is presented in this paper. The algorithm supports multiple producers and multiple consumers and weak memory models. It has been designed to be cache-aware...
Provided by Chalmers University of Technology
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White Papers
A Self-Stabilizing (k,r)-Clustering Algorithm With Multiple Paths for Wireless Ad-Hoc Networks
November 8, 2011, 12:00am PST
Wireless Ad-hoc networks are distributed systems that often reside in error-prone environments. Self-stabilization lets the system recover autonomously from an arbitrary state, making the system...
Provided by Chalmers University of Technology
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White Papers
Programming Future Parallel Architectures With Haskell and Intel ArBB
May 21, 2011, 12:00am PDT
New parallel architectures, such as Cell, Intel MIC, GPUs, and tiled architectures, enable high performance but are often hard to program. What is needed is a bridge between high-level programming...
Provided by Chalmers University of Technology
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White Papers
Resource Allocation and Control Signaling in the WINNER Flexible MAC Concept
June 10, 2008, 12:00am PDT
The EU WINNER projects have studied OFDM-based packet data systems beyond 3G that use adaptivity on all timescales to obtain high flexibility and performance. The adaptive transmission in both...
Provided by Chalmers University of Technology
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White Papers
Performance Evaluation of Memory-Less and Kalman-Based Channel Estimation for OFDMA
January 20, 2009, 12:00am PST
The next generation wireless systems based on Orthogonal Frequency Division Multiple Access (OFDMA) need to operate in widely different deployment and usage scenarios. Thus, support for flexible...
Provided by Chalmers University of Technology
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White Papers
A Complexity Adjustable Scheduling Algorithm for Throughput Maximization in Clusterized TDMA Networks
February 28, 2011, 12:00am PST
The authors consider clustered wireless networks, where transceivers in a cluster use a time-slotted mechanism (TDMA) to access a wireless channel that is shared among several clusters. Earlier...
Provided by Chalmers University of Technology
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White Papers
Diversity Characterization of Optimized Two-Antenna Systems for UMTS Handsets
November 22, 2007, 12:00am PST
This paper presents the evaluation of the diversity performance of several two-antenna systems for UMTS terminals. All the measurements are done in a reverberation chamber and in a Wheeler cap...
Provided by Chalmers University of Technology
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White Papers
State of the Art Survey of Wireless Vehicular Communication Projects
August 27, 2008, 12:00am PDT
In this paper the results of a state of the art survey, using publicly available information, are presented. The scope of the survey concerns projects that include wireless communication...
Provided by Chalmers University of Technology
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White Papers
ContikiSec: A Secure Network Layer for Wireless Sensor Networks Under the Contiki Operating System
October 8, 2009, 12:00am PDT
In this paper, the authors introduce ContikiSec, a secure network layer for wireless sensor networks, designed for the Contiki Operating System. ContikiSec has a configurable design, providing...
Provided by Chalmers University of Technology
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White Papers
Wireless Network Positioning as a Convex Feasibility Problem
January 1, 2011, 12:00am PST
In this paper, the positioning problem is formulated as a Convex Feasibility Problem (CFP). To solve the CFP for non-cooperative networks, the authors consider the well-known Projection Onto...
Provided by Chalmers University of Technology
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White Papers
Censored Cooperative Positioning for Dense Wireless Networks
June 14, 2010, 12:00am PDT
Cooperative positioning is an emerging topic in wireless sensor networks and navigation. It can improve the positioning accuracy and coverage in GPS-challenged conditions such as inside tunnels,...
Provided by Chalmers University of Technology
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White Papers
Hybrid GNSS-Terrestrial Cooperative Positioning Via Distributed Belief Propagation
July 27, 2010, 12:00am PDT
Cooperative positioning algorithms have been recently introduced to overcome the limitations of traditional methods, relying on GNSS or other terrestrial infrastructure. In particular, SPAWN...
Provided by Chalmers University of Technology
-
White Papers
The Mobile Broadband and Fixed Broadband Battle in Swedish Market: Exploring Complementary or Substitution
September 15, 2010, 12:00am PDT
The Mobile BroadBand (MBB) in Swedish market has become a more attractive opportunity for service providers, with growing demand for ubiquitous broadband connectivity after the mobile operators...
Provided by Chalmers University of Technology
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