KTH - Royal Institute of Technology

Displaying 81-102 of 102 results

  • White Papers // Mar 2009

    Finance And R&D Investments - Is There A Debt Overhang Effect On R&D Investments?

    The motivation of this paper is the rather naive approach to debt as a financing source of R&D investment in the empirical investment literature. The author focuses on long-term relational debt based on its appealing contractual properties and discovers a debt overhang effect for the relationship between additional long-term debt...

    Provided By KTH - Royal Institute of Technology

  • White Papers // Mar 2009

    Ownership Structure, Board Composition And Investment Performance

    In this paper the relation between ownership structure, board composition and firm performance is explored. A panel of Swedish listed firms is used to investigate how board composition affects firm performance. Board heterogeneity is measured as board size, age and gender diversity. The results show that Swedish board of directors...

    Provided By KTH - Royal Institute of Technology

  • White Papers // Feb 2009

    Automated Multidimensional Characterization of Power Amplifier for Design and Production

    Designing, optimizing and producing modern Power Amplifiers (PA) requires new and fast RF (Radio Frequency) measurement techniques capable of characterizing its real behavior. PAs are a truly multidimensional device where many desired performance parameters are contradictory to each other. This is especially true for the generation of modern communication PAs...

    Provided By KTH - Royal Institute of Technology

  • White Papers // Feb 2009

    High-Level Estimation and Trade-Off Analysis for Adaptive Real-Time Systems

    The authors propose a novel design estimation method for adaptive streaming applications to be implemented on a partially reconfigurable FPGA. Based on experimental results they enable accurate design cost estimates at an early design stage. Given the size and computation time of a set of configurations, which can be derived...

    Provided By KTH - Royal Institute of Technology

  • White Papers // Jan 2009

    Priority Based Forced Requeue to Reduce Worst-Case Latencies for Bursty Traffic

    In this paper the authors introduce Priority Based Forced Requeue to decrease worst-case latencies in NoCs offering best effort services. Forced Requeue is to prematurely lift out low priority packets from the network and requeue them outside using priority queues. The first benefit of this approach, applicable to any NoC...

    Provided By KTH - Royal Institute of Technology

  • White Papers // Jan 2009

    Flow Regulation for On-Chip Communication

    IPs for a SoC are typically developed concurrently using a standard interface, for example, AXI or OCP. Despite the standard interfaces, integrating IPs to a SoC infrastructure presents challenges because traffic flows from IPs are diverse and typically they have stringent performance constraints; the impact of interferences among traffic flows...

    Provided By KTH - Royal Institute of Technology

  • White Papers // Jan 2009

    Buffer Minimization of Real-Time Streaming Applications Scheduling on Hybrid CPU/FPGA Architectures

    The authors address the problem of real-time streaming applications scheduling on hybrid CPU/FPGA architectures. The main contribution is a two-step approach to minimize the buffer requirement for streaming applications with throughput guarantees. A novel declarative way of constraint based scheduling for real-time hybrid SW/HW systems is proposed, while the application...

    Provided By KTH - Royal Institute of Technology

  • White Papers // Jan 2009

    MagicNET: The Human Immune System and Network Security System

    Most of the current security systems do not provide adequate level of protection against ever-increasing threats. The main reason for their failure is the use of point solutions to protect hosts and reactive approach against intrusions. The paper studied human immune system, which survives under dynamic changing conditions and provides...

    Provided By KTH - Royal Institute of Technology

  • White Papers // Jan 2009

    Efficient Link Scheduling and Channel Hopping for Convergecast in Wireless HART Networks

    There is a strong current interest in migrating substantial parts of the traditionally wired industrial infrastructure to wireless technologies to improve flexibility, scalability, and efficiency. However, concerns about network latency, reliability and security along with the lack of device interoperability have hampered the deployment rate. To address these concerns, WirelessHART,...

    Provided By KTH - Royal Institute of Technology

  • White Papers // Dec 2008

    Optimal Stopping for Event-Triggered Sensing and Actuation

    Novel event-triggered sensing and actuation strategies are presented for networked control systems with limited communication resources. Two architectures are considered: one with the controller co-located with the sensor and one with the control co-located with the actuator. A stochastic control problem with an optimal stopping rule is shown to capture...

    Provided By KTH - Royal Institute of Technology

  • White Papers // Dec 2008

    Implementation of a DLI-Guard Using the AMBA AXI Protocol for Network-on-Chip

    Nowdays, the integration of several system components or IP blocks, such as processors, DSP units and memories on one chip is overwhelming the industry. The method of integrating several components on one chip is known as System on Chip (SoC) design. Due to the increase of the number of the...

    Provided By KTH - Royal Institute of Technology

  • White Papers // Sep 2008

    Pulse Shape Adaptivity in OFDM/OQAM Systems

    Adaptation is crucial to realize high data rate transmission in multicarrier communication systems over dispersive channels. Apart from rate/power adaptation enabled by Orthogonal Frequency Division Multiplexing (OFDM), OFDM/offset QAM (OFDM/OQAM) systems provide possibility to adjust pulse shapes regarding to the channel characteristics. In this paper, the authors discuss and evaluate...

    Provided By KTH - Royal Institute of Technology

  • White Papers // Sep 2008

    Pilot-Based Bayesian Channel Norm Estimation in Rayleigh Fading Multi-Antenna Systems

    Pilot-based estimation of the squared Euclidean norm of the channel vector of a Rayleigh fading system is considered. Unlike most previous work in the area of estimation of multiple antenna channels, the authors consider Bayesian estimation where the long-term channel statistics are known a priori. Closed-form expressions of the Minimum...

    Provided By KTH - Royal Institute of Technology

  • White Papers // Sep 2008

    Subgradient Methods and Consensus Algorithms for Solving Convex Optimization Problems

    In this paper, the authors propose a subgradient method for solving coupled optimization problems in a distributed way given restrictions on the communication topology. The iterative procedure maintains local variables at each node and relies on local subgradient updates in combination with a consensus process. The local subgradient steps are...

    Provided By KTH - Royal Institute of Technology

  • White Papers // Sep 2008

    Cascade Structural Model Approximation of Identified State Space Models

    General black-box system identification techniques such as subspace system identification and FIR/ARX least squares system identification are commonly used to identify multi-input multi-output models from experimental data. However, in many applications there are a priori given structural information. Here the focus is on linear dynamical systems with a cascade structure,...

    Provided By KTH - Royal Institute of Technology

  • White Papers // Sep 2008

    Deadline-Constrained Transmission Scheduling and Data Evacuation in WirelessHART Networks

    Real-time data delivery is a critical issue in wirelessHART networks. This paper develops a novel mathematical programming framework for joint routing and link scheduling of deadline-constrained traffic in wirelessHART networks. The general framework explores dynamic network flows in a time-expanded graph model and can provide flexible solutions for a variety...

    Provided By KTH - Royal Institute of Technology

  • White Papers // Aug 2008

    Performance Analysis of Reconfiguration in Adaptive Real-Time Streaming Applications

    The authors propose a design optimization framework for adaptive real-time streaming applications. The main contribution is a hybrid approach for performance analysis combining formal analysis and simulation using a two-phase framework. They formulate the scheduling problem of adaptive streaming applications with ILP analysis, and use the simulation based on the...

    Provided By KTH - Royal Institute of Technology

  • White Papers // Aug 2008

    Design and Performance of Optimized Relay Mappings

    The authors look at the three-node relay channel and the transmission of an information symbol from the source node to the destination node. They let the relay be a memoryless function and formulate necessary conditions for the optimality of the relay mapping and the detector. Based on these, they propose...

    Provided By KTH - Royal Institute of Technology

  • White Papers // Jul 2008

    The Break-Even Cost of Bit-Rate Fairness in Cellular-Relaying Networks

    In order to maximize the profit, an operator must choose the network architecture, deployment solution, and radio resource allocation depending on which fairness should the network enforce. The use of fixed relays has been proposed in the literature as cost-efficient way to enhance cellular networks. In this paper, the authors...

    Provided By KTH - Royal Institute of Technology

  • White Papers // Jul 2008

    Estimation of the Rician K-factor in Reverberation Chambers for Improved Repeatability in Terminal Antenna Measurements

    An estimator of the RicianK-factor for reverberation chamber is derived in this paper using maximum likelihood estimation approach. This is done by reviewing the existing statistical model of the fields in the reverberation chamber. The functionality of the derived K-factor estimator is tested with the measurement data for the well...

    Provided By KTH - Royal Institute of Technology

  • White Papers // Jun 2006

    Strategic Business and IT Alignment: A Prioritized Theory Diagram

    Many academic and practitioners' studies have shown that misalignment or lack of alignment between Information Technology (IT) and business strategies is one of the main reasons why enterprises fail to exploit the full potential of their IT investments. Furthermore, organizations that have accomplished a high degree of alignment are often...

    Provided By KTH - Royal Institute of Technology

  • White Papers // Oct 2004

    Human Capital Development and Competence Structures in Changing Media Production Environments

    This doctoral paper discusses the competence structures and the development of human capital in the graphic arts and media sector. The study has focused on exploring the new media landscape and in particular the structural changes that influence the sector, the print-versus electronic-media debate and the future of print media....

    Provided By KTH - Royal Institute of Technology

  • White Papers // Feb 2009

    High-Level Estimation and Trade-Off Analysis for Adaptive Real-Time Systems

    The authors propose a novel design estimation method for adaptive streaming applications to be implemented on a partially reconfigurable FPGA. Based on experimental results they enable accurate design cost estimates at an early design stage. Given the size and computation time of a set of configurations, which can be derived...

    Provided By KTH - Royal Institute of Technology

  • White Papers // Nov 2012

    Low Complexity Adaptive Antenna Selection for Cognitive Radio MIMO Broadcast Channels

    A multi-antenna cognitive radio network, with a single pair of primary users and a secondary broadcast channel, is considered. Under perfect Channel State Information (CSI), the rate-optimal strategy for the primary link is waterfilling, resulting in possibly unused dimensions. The secondary base station, supplied with perfect and global CSI, employs...

    Provided By KTH - Royal Institute of Technology

  • White Papers // Aug 2008

    Design and Performance of Optimized Relay Mappings

    The authors look at the three-node relay channel and the transmission of an information symbol from the source node to the destination node. They let the relay be a memoryless function and formulate necessary conditions for the optimality of the relay mapping and the detector. Based on these, they propose...

    Provided By KTH - Royal Institute of Technology

  • White Papers // Sep 2008

    Pulse Shape Adaptivity in OFDM/OQAM Systems

    Adaptation is crucial to realize high data rate transmission in multicarrier communication systems over dispersive channels. Apart from rate/power adaptation enabled by Orthogonal Frequency Division Multiplexing (OFDM), OFDM/offset QAM (OFDM/OQAM) systems provide possibility to adjust pulse shapes regarding to the channel characteristics. In this paper, the authors discuss and evaluate...

    Provided By KTH - Royal Institute of Technology

  • White Papers // Sep 2008

    Cascade Structural Model Approximation of Identified State Space Models

    General black-box system identification techniques such as subspace system identification and FIR/ARX least squares system identification are commonly used to identify multi-input multi-output models from experimental data. However, in many applications there are a priori given structural information. Here the focus is on linear dynamical systems with a cascade structure,...

    Provided By KTH - Royal Institute of Technology

  • White Papers // Mar 2011

    On Designing Optimal Servomechanism Controller With Limited Model Information

    The family of limited model information designs, which construct controllers by accessing the plant's model in a constrained manner, is introduced in this paper. The closed-loop constant-disturbance rejection performance of the best Proportional-Integral (PI) controller that they can produce is investigated. For a class of linear discrete-time time-invariant plants, it...

    Provided By KTH - Royal Institute of Technology

  • White Papers // Nov 2009

    Supporting Distributed Shared Memory on Multi-Core Network-on-Chips Using a Dual Microcoded Controller

    Supporting Distributed Shared Memory (DSM) is essential for multi-core Network-on-Chips for the sake of reusing huge amount of legacy code and easy programmability. The authors propose a microcoded controller as a hardware module in each node to connect the core, the local memory and the network. The controller is programmable...

    Provided By KTH - Royal Institute of Technology

  • White Papers // Apr 2010

    Supporting Efficient Synchronization in Multi-Core NoCs Using Dynamic Buffer Allocation Technique

    This paper explores a dynamic buffer allocation technique to guide distributed synchronization architecture to support efficient synchronization on multi-core Network-on-Chips (NoCs). The synchronization architecture features two physical buffers to be able to concurrently queue and handle synchronization requests issued by the local processor and remote processors via the on-chip network....

    Provided By KTH - Royal Institute of Technology

  • White Papers // Jul 2010

    Handling Shared Variable Synchronization in Multi-Core Network-on-Chips With Distributed Memory

    Parallelized shared variable applications running on multi-core Network-on-Chips (NoCs) require efficient support for synchronization, since communication is on the critical path of system performance and contended synchronization requests may cause large performance penalty. In this paper, the authors propose a dedicated hardware module for synchronization management. This module is called...

    Provided By KTH - Royal Institute of Technology

  • White Papers // Aug 2008

    Performance Analysis of Reconfiguration in Adaptive Real-Time Streaming Applications

    The authors propose a design optimization framework for adaptive real-time streaming applications. The main contribution is a hybrid approach for performance analysis combining formal analysis and simulation using a two-phase framework. They formulate the scheduling problem of adaptive streaming applications with ILP analysis, and use the simulation based on the...

    Provided By KTH - Royal Institute of Technology

  • White Papers // Apr 2009

    Network-Calculus-Based Performance Analysis for Wireless Sensor Networks

    Recently, Wireless Sensor Network (WSN) has become a promising technology with a wide range of applications such as supply chain monitoring and environment surveillance. It is typically composed of multiple tiny devices equipped with limited sensing, computing and wireless communication capabilities. Design of such networks presents several technique challenges while...

    Provided By KTH - Royal Institute of Technology

  • White Papers // Dec 2008

    Implementation of a DLI-Guard Using the AMBA AXI Protocol for Network-on-Chip

    Nowdays, the integration of several system components or IP blocks, such as processors, DSP units and memories on one chip is overwhelming the industry. The method of integrating several components on one chip is known as System on Chip (SoC) design. Due to the increase of the number of the...

    Provided By KTH - Royal Institute of Technology

  • White Papers // Jun 2009

    Trigger Algorithm Development on FPGA-Based Compute Nodes

    Based on the ATCA computation architecture and Compute Nodes (CN), investigation and implementation work has been being executed for HADES and PANDA trigger algorithms. The authors present the designs for HADES track reconstruction processing, Cherenkov ring recognition, Time-Of-Flight processing, electromagnetic shower recognition, and the PANDA straw tube tracking algorithm. They...

    Provided By KTH - Royal Institute of Technology

  • White Papers // Oct 2009

    A Reconfigurable Design Framework for FPGA Adaptive Computing

    Partial Reconfiguration (PR) offers the possibility to adaptively change part of the FPGA design without stopping the remaining system. In this paper, the authors present a comprehensive framework for adaptive computing, in which design key points of hardware processes, system interconnections, Operating Systems (OS), device drivers, scheduler software as well...

    Provided By KTH - Royal Institute of Technology

  • White Papers // Dec 2009

    Scalability of Relaxed Consistency Models in NoC Based Multicore Architectures

    This paper studies realization of relaxed memory consistency models in the network-on-chip based Distributed Shared Memory (DSM) multi-core systems. Within DSM systems, memory consistency is a critical issue since it affects not only the performance but also the correctness of programs. The authors investigate the scalability of the relaxed consistency...

    Provided By KTH - Royal Institute of Technology

  • White Papers // Jun 2009

    A Flow Regulator for On-Chip Communication

    IPs for a SoC are typically developed concurrently using a standard interface, for example, AXI or OCP. Despite the standard interfaces, integrating IPs to a SoC infrastructure presents challenges because traffic flows from IPs are diverse and typically have stringent performance constraints; the impact of interferences among traffic flows is...

    Provided By KTH - Royal Institute of Technology

  • White Papers // Sep 2009

    Protocol Design for Control Applications Using Wireless Sensor Networks

    Given the potential benefits offered by Wireless Sensor Networks (WSNs), they are becoming an appealing technology for process, manufacturing, and industrial control applications. In this paper, the authors propose a novel approach to WSN protocol design for control applications. The protocols are designed to minimize the energy consumption of the...

    Provided By KTH - Royal Institute of Technology

  • White Papers // Dec 2009

    Adaptive IEEE 802.15.4 Protocol for Reliable and Timely Communications

    The authors present an adaptive Medium Access Control (MAC) design for minimizing the power consumption while guaranteeing reliability and delay constraints, which is developed for the slotted IEEE 802.15.4 standard. By considering the Bianchi's MAC model, they present a generalized Markov chain model and the usage of MAC model in...

    Provided By KTH - Royal Institute of Technology

  • White Papers // Mar 2010

    Accurate Delay Analysis of Slotted IEEE 802.15.4 for Control Applications

    To understand the fundamental performance limits and the quality of service offered by the IEEE 802.15.4 standard for control applications, the packet delay distribution plays a major role. Due to the random backoff mechanism employed by the IEEE 802.15.4 medium access protocol (MAC), it is difficult to derive such a...

    Provided By KTH - Royal Institute of Technology

  • White Papers // Aug 2010

    Breath: An Adaptive Protocol for Industrial Control Applications Using Wireless Sensor Networks

    An energy-efficient, reliable and timely data transmission is essential for Wireless Sensor Networks (WSNs) employed in scenarios where plant information must be available for control applications. To reach a maximum efficiency, cross layer interaction is a major design paradigm to exploit the complex interaction among the layers of the protocol...

    Provided By KTH - Royal Institute of Technology

  • White Papers // Dec 2009

    Limitations of Robust Control Over WSN: UFAD Control in Intelligent Buildings

    Intelligent buildings ventilation control is a challenging automation problem with objectives that rise several research problems of immediate actuality, such as the wireless automation and the control of complex interconnected subsystems. The system considered is composed of ventilated rooms, fans, plenums and a wireless network. The complexity arises from the...

    Provided By KTH - Royal Institute of Technology

  • White Papers // Jan 2011

    Wireless Networked Control System Co-Design

    A framework for the joint design of wireless network and controllers is proposed. Multiple control systems are considered where the sensor measurements are transmitted to the controller over the IEEE 802.15.4 protocol. The essential issues of wireless Networked Control Systems (NCSs) are investigated to provide an abstraction of the wireless...

    Provided By KTH - Royal Institute of Technology