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ABSTRACT: This study describes the power conversion and control solution used in the electrical power take-off of a 35 kW test rig developed to investigate a linear, direct drive, air-cored, tubular, permanent magnet generator for an offshore wave energy device. The solution proposed is to collect the power extracted directly from individual coils of the generator, which have different induced voltages and cannot easily be connected into a small number of phases. Local energy storage is integrated into the system to smooth the electrical output power and reduce the rating of the downstream inverter for grid interfacing. The solution is demonstrated by analysis, backed up by simulation and test results. This shows the potential and limitations of the proposed conversion technology solution.
IET Renewable Power Generation 02/2011; · 1.74 Impact Factor
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ABSTRACT: Mask inspection has become a major bottleneck in the manufacturing flow taking up as much as 30% of the total manufacturing time. In this work we explore techniques to improve the reticle inspection flow by increasing its design awareness. We develop an algorithm to locate non-functional features in a post-OPC layout with 100% accuracy without using any design information. Using this, and timing information of the design (if available), we assign a minimum size defect to each reticle feature that could cause the design to fail. The criticality of various reticle features is then used to partition the reticle such that each partition is inspected at a different pixel size and sensitivity so that the false+nuisance defect count is reduced without missing any critical defect. Up to 4X improvement in false+nuisance defect count is observed with our technique resulting in up to 55% improvement in first pass yield coming from reduction in nuisance defects and substantial reduction in defect review load.
Computer-Aided Design (ICCAD), 2010 IEEE/ACM International Conference on; 12/2010
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ABSTRACT: Power quality (PQ) is becoming increasingly important owing to the increasing use of power electronic devices, coupled with the increasing penetration of loads, which are sensitive to voltage disturbances. As a result of the problems caused by the confluence of these two trends, there is an increasing need for PQ to be monitored in order to diagnose its nature and locate the source of the disturbance, allowing remedial measures to be taken. While automated systems for diagnosis of PQ events have been developed, identifying the location of the source of a disturbance is a problem, which has not been fully addressed to date; in particular the question of locating a non-stationary disturbance. In this study, a novel approach to identify the location of the source of a PQ disturbance is described, using a form of artificial neural network known as a self-organising map. The proposed technique is verified via simulation of the IEEE 14-bus model in PSCAD and an experimental system based on the IEEE 6-bus model. This approach provides a mean of locating the source of PQ events, including transient disturbances.
IET Generation Transmission & Distribution 11/2010; · 1.20 Impact Factor
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ABSTRACT: Heart rate is dependent on a cycle of depolarization and repolarization of the atria and ventricles that is regulated by intrinsic and extrinsic factors. Inhomogeneity in ventricular repolarization, measured as QT interval dispersion (QTd) is likely to lead to arrhythmia. The role of the autonomic nervous system in the development of this inhomogeneity is still uncertain. Autonomic regulation can be measured using the tone-entropy algorithm, which indicates inter-beat interval variation. When a sliding cut-off for QTd was used only the control group had a significant association between QTd and both tone and entropy. This finding suggests that for certain levels of ventricular inhomogeneity, autonomic control becomes more dissociated from intra-beat variation measured by QTd. This may be an early sign of potentially fatal arrhythmia.
Computing in Cardiology, 2010; 10/2010
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ABSTRACT: Improving risk assessment to provide evidence for preventative intervention has recently become more of a focus in cardiovascular medicine with atherosclerosis as an early manifestation of cardiovascular disease. The total cholesterol to high-density lipoprotein (TC/HDL) ratio is often used an atherogenic index. High levels of the TC/HDL ratio also affect nervous system function and this study investigated the relationship between TC/HDL and heart rate variability measured by the tone-entropy algorithm. For tone there was a significant indication that cholesterol levels? influences autonomic nervous system function in control individuals with no cardiovascular disease, but not in diabetics. Entropy was not associated with TC/HDL in eitherthe control ordiabetes group. The relationship seen for tone and TC/HDL suggests that tone can be used as an initial risk indicator for further invasive cardiac function testing.
Computing in Cardiology, 2010; 10/2010
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ABSTRACT: Different signal processing techniques are available for automatic detection and diagnosis of power quality disturbances. This paper describes the results of a comparison of the effects of frequency deviation on the accuracy of a number of widely used techniques for signal harmonic analysis, together with a means of mitigation of these effects.
Universities Power Engineering Conference, 2008. UPEC 2008. 43rd International; 10/2008
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ABSTRACT: Pressures for improved safety and performance in healthcare often are addressed by the imposition of tighter control over processes directed at producing "perfect performance of work." A series of near-miss incidents related to a routine hospital procedure demonstrates how these efforts can yield unintended and unappreciated consequences, undermining system resilience and safety despite the best of intentions. Attention to conflicts between goals and tasks across the organization and the role of workers in creating resilience are overlooked as contributors to system safety.
Systems, Man and Cybernetics, 2007. ISIC. IEEE International Conference on; 11/2007
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ABSTRACT: This paper describes the design build and test of a linear test rig for demonstrating novel topology linear machines. The work is aimed at aiding the developments of power take off for wave and tidal energy converters. The rig consists of three parts: prime mover, test machine and converter. Experience and method for the design manufacture and initial testing of each of these components is detailed.
Proceedings of the Institute of Marine Engineering, Science, and Technology. Part A, Journal of marine engineering and technology 08/2007; 2007(10):3-15. · 0.08 Impact Factor
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ABSTRACT: This paper describes the development of an extremely powerful, small-form-factor FPGA-based hardware system for high-bandwidth optical networks. This fully configurable platform exploits the recent advances in programmable logic to offer highly efficient and targeted solutions for a wide range of communications applications. As a first illustrative example, an FPGA solution for interface to the ITU-T G.709 Optical Transport Network (OTN) is presented, and the platforms fast-prototyping and reuse potential is discussed. FPGAs are identified as ideal replacements for Application Specific Integrated Circuits (ASICs) in next generation communications networks, and a migration path to higher bandwidth configurable systems is proposed.
Networking, International Conference on Systems and International Conference on Mobile Communications and Learning Technologies, 2006. ICN/ICONS/MCL 2006. International Conference on; 05/2006
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ABSTRACT: The study describes a power electronic conversion and control scheme for a 8.5 kW, multi-coil, linear, permanent magnet, air -cored generator for direct-drive wave energy conversion developed for a wave energy Test Rig developed for the New & Renewable Energy Centre at Blyth, Northumberland. The proposed scheme is justified against the requirements implied by the features of the linear generator design. Simulation and preliminary test results are presented.
Power Electronics, Machines and Drives, 2006. The 3rd IET International Conference on; 04/2006
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V Wood,
R Gwilliam,
M-A Rajandream,
M Lyne,
R Lyne,
A Stewart,
J Sgouros,
N Peat,
J Hayles,
S Baker, [......],
L Cerutti,
T Lowe,
W R McCombie,
I Paulsen,
J Potashkin,
G V Shpakovski,
D Ussery,
B G Barrell,
P Nurse,
L Cerrutti
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ABSTRACT: We have sequenced and annotated the genome of fission yeast (Schizosaccharomyces pombe), which contains the smallest number of protein-coding genes yet recorded for a eukaryote: 4,824. The centromeres are between 35 and 110 kilobases (kb) and contain related repeats including a highly conserved 1.8-kb element. Regions upstream of genes are longer than in budding yeast (Saccharomyces cerevisiae), possibly reflecting more-extended control regions. Some 43% of the genes contain introns, of which there are 4,730. Fifty genes have significant similarity with human disease genes; half of these are cancer related. We identify highly conserved genes important for eukaryotic cell organization including those required for the cytoskeleton, compartmentation, cell-cycle control, proteolysis, protein phosphorylation and RNA splicing. These genes may have originated with the appearance of eukaryotic life. Few similarly conserved genes that are important for multicellular organization were identified, suggesting that the transition from prokaryotes to eukaryotes required more new genes than did the transition from unicellular to multicellular organization.
Nature 03/2002; 415(6874):871-80. · 36.28 Impact Factor
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V Wood,
R Gwilliam,
M A Rajandream,
M Lyne,
R. Lyne,
A Stewart,
J. Sgouros,
N. Peat,
J Hayles,
S Baker, [......],
S L Forsburg,
L Cerutti,
T. Lowe,
W R McCombie,
I Paulsen,
J Potashkin,
G V Shpakovski,
D. Ussery,
B G Barrell,
P Nurse
