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We performed and succeeded in the time synchronization through the experimental satellite for communication, WINDS using PTP [1]. PTP is the protocol for time synchronization which is also called IEEE 1588. It is said that PTP is more accurate than NTP which is popular for us as the time synchronization protocol because of their synchronization algorithm. WINDS is the communication satellite launched...
This paper proposes synchronization method and the robot-based remote laser welding system as a means of resolving the limited welding speed and accuracy of conventional laser welding systems. On this paper, a study of robot based remote laser welding technology for manufacturing light car body was conducted. Laser patterning on the fly needs to control some parameters to accomplish the desired shape...
A post-synchronization method for a localization system is presented here. The synchronization of independent secondary radar units of an active localization system is essential. There are different synchronization techniques. One of these is FSK-pre-synchronization, which is analysed in this paper. The precision of the pre-synchronization is not accurate enough for round trip phase measurement. The...
There is great demand for an accurate and scalable metric to evaluate the functional stimuli, testbench checkers, and DfD (Design-for-Debug) structures used in post-silicon timing validation. In this paper, we show the inadequacy of existing methods (due to either inaccuracy or a lack of scalability) and propose an approach that leverages debug engineers' experience to model timing errors efficiently...
This work introduces a new branch predictor design that increases the perceived predictor capacity without increasing its delay by using a large virtual second-level table allocated in the second-level caches. Virtualization is applied to a state-of-the-art multi-table branch predictor. We evaluate the design using instruction count as proxy for timing on a set of commercial workloads. For a predictor...
In this paper we propose using one of the stochastic methods — Probabilistic Collocation Method (PCM) to find simplified polynomial mapping between two uncertain Air-Traffic System (ATS) parameter data sets. These two parameter sets can be two distinguished collection of measured parameters depicting various aspects of one specific air-traffic system, and the knowledge of parameters distribution is...
Approximation can increase performance or reduce power consumption with a simplified or inaccurate circuit in application contexts where strict requirements are relaxed. For applications related to human senses, approximate arithmetic can be used to generate sufficient results rather than absolutely accurate results. Approximate design exploits a tradeoff of accuracy in computation versus performance...
Host-compiled simulation has been widely adopted as a practical approach for fast and high-level evaluation of complex software-intensive systems at early stages of the design process. In such approaches, higher speed is achieved by coarse-grained simulation of the system, which also leads to a loss in timing accuracy. To eliminate the inherent speed and accuracy tradeoff, we present an adjustive...
To enable statistical static timing analysis, for each cell in a digital library, a timing model that considers variations must be characterized. In this paper, we propose a dynamic method to accurately and efficiently characterize a cell's delay and output slew as a function of random mismatch variations. Based on a tight error bound for characterization using partial devices, our method sequentially...
Network-on-chip (NoC) is very important for many applications, such as many-core architectures and application-specific usages. For exploring the design space, several approaches have been proposed with different considerations. In this paper, inspired by bloom filters, we propose Attackboard, a novel design for exploring the design space of NoC, which satisfies accuracy, space efficiency, and simplicity...
Wide Area Measurement Systems (WAMS) are increasingly used to observe the static and dynamic performance of power systems. Synchronised phasor measurements are also a valuable wide-area input to control and protection schemes. It is important that PMUs perform correctly for the various purposes that the data is used for. Standard and type testing is valuable, but it is also necessary to have the capability...
A sliding mode observer in the presence of sampled output information and its application to fault reconstruction is studied. The observer is designed by using the delayed continuous-time representation of the sampled-data system, for which a set of Linear Matrix Inequalities (LMIs) provide conditions for the ultimate boundedness. It is shown that an ideal sliding motion cannot be achieved in the...
Fractional order models in One Non-integer Order Plus Time Delay (NIOPTD-I) template have been used for time domain online and offline system identification. A newly proposed Nyquist based model reduction technique has been used for reduced parameter modeling of the identified models. The comparative accuracies of the test plants in the online and offline identification and reduced parameter modeling...
This paper presents a generalized minimax approach for designing odd-order finite-impulse-response (FIR) variable fractional-delay (VFD) digital filters using a regular polygon and analyzes the trade-off between the design time and design accuracy. The complex-valued frequency response errors are constrained inside a regular polygon, and the constrains are linear functions of the VFD filter coefficients...
Protection and performance are the major requirements for any Intrusion Detection and/or Prevention System (IDPS). Existing IDPSs do not seem to provide a satisfactory method of achieving these two conflicting goals. Intrusion Detection Systems (IDSs) fulfill the network performance requirement but exhibit poor protection under successive attacks. On the other hand, Intrusion Prevention Systems (IPSs)...
Service composition constructs composite applications with different services to fulfill numerous service requirements. Different users have various QoS demands for composite services. In this paper, we present a service composition model considering not only multiple QoS constraints but also load balance factors. Moreover, a service selection algorithm based on niching technique and particle swarm...
This article describes a new approach for higher radix butterflies suitable for pipeline implementation. Based on the butterfly computation introduced by Cooley-Tukey [1], we will introduce a novel approach for the Discrete Fourier Transform (DFT) factorization, by redefining the butterfly computation, which is more suitable for efficient VLSI implementation. The proposed factorization motivated us...
Among Sound Source Localization (SSL) methods, beamformed microphone arrays using Steering Response Power(SRP) has received significant attention. Yet, its application is stumbled by its computational complexity which cannot meet low-power/low-cost applications requirements. In this paper, Angular beamforming is presented. By applying this beamforming approach to the conventional SRP-PHAT one can...
A new digital background calibration algorithm for pipelined analog-to-digital converters is proposed in this paper. It is based on error estimation with non-precision calibration signals for foreground correction and a modified split structure for converting the foreground structure to the background one. This architecture allows improving the calibration signals accuracy contrarily to linear gain...
In stream data processing, data arrives continuously and is processed by decision making, process control and e-science applications. To control and monitor these applications, reproducibility of result is a vital requirement. However, it requires massive amount of storage space to store fine-grained provenance data especially for those transformations with overlapping sliding windows. In this paper,...
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