Defensive islanding is an efficient way to avoid catastrophic failures and wide area blackouts. Power system splitting especially for large scale power systems is a combinatorial explosion problem. Thus, it is very di...
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Defensive islanding is an efficient way to avoid catastrophic failures and wide area blackouts. Power system splitting especially for large scale power systems is a combinatorial explosion problem. Thus, it is very difficult to find an optimal solution (if one exists) for large scale power system in real time. This paper proposes to utilize the computational efficiency property of binary particle swarm optimization (BPSO) to find some efficient splitting solutions in limited timeframe. The solutions are optimized based on a cost function considering the balance between real power generation and consumption, the relative importance of customers, the capacities of distribution and transmission systems, and possibility of region to be impacted, etc. The solutions not only provide the lines to cut but also the corresponding load shedding information in each island. Simulations with large scale power system demonstrate the effectiveness of the proposed algorithm.
This paper presents results on the parameters of multipath components extracted from wideband measured MIMO channel matrices. Experimental data were collected with wideband channel sounding measurements at 5.2 GHz in ...
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This paper presents results on the parameters of multipath components extracted from wideband measured MIMO channel matrices. Experimental data were collected with wideband channel sounding measurements at 5.2 GHz in a microcell urban environment, under line of sight propagation conditions. The double directional and propagation delay parameter values of the dominant multipaths were estimated using the multidimensional parameter estimation algorithm. The results presented provide information in the context of parametric MIMO channel characterization and refer to the number of identified waves, and focus on the path weights characteristics. Additionally, the extracted multipath estimates are used to synthesize MIMO matrices that are compared to the directly measured data.
This paper presents a top-down approach to the design of all-silicon CMOS-based fully integrated optical receivers. From the system-level requirements, we determine the optimum block-level specifications, based on whi...
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This paper presents a top-down approach to the design of all-silicon CMOS-based fully integrated optical receivers. From the system-level requirements, we determine the optimum block-level specifications, based on which the individual building blocks are designed. Measurement results of the manufactured design show operation at data rates exceeding 2.5-Gbps/channel for the detector, the amplification and the clock and data recovery circuits. This proof of concept is the first step towards design optimized, completely integrated, multi-channel optical receivers for high-bandwidth short-distance chip-to-chip interconnects
Invasive arterial blood pressure (BP) is a vital sign in hemodynamic monitoring of trauma intensive care unit (ICU) patients. Continuous BP analysis can potentially provide additional information about patient status,...
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Invasive arterial blood pressure (BP) is a vital sign in hemodynamic monitoring of trauma intensive care unit (ICU) patients. Continuous BP analysis can potentially provide additional information about patient status, predict morbidity and mortality, and automatically populate electronic nurse charting systems than intermittent monitoring. Challenges to routine application in the ICU include integration of complex physiological data collection systems, artifacts, missing data, and the various clinical interventions that may temporarily corrupt the BP signal. We have developed and previously described SIMON (signal interpretation and monitoring), a physiological data collection system in the Trauma ICU at Vanderbilt University. In order to extract useful information from continuous arterial line BP monitoring, it is necessary to remove non-physiological artifacts. In this setting, potential artifacts appear to be caused by resonance, over-damping, and data transmission. We designed a simple filter to identify various sources of non-physiological artifacts using statistical signal processing techniques. We implemented the filter to arterial invasive BP signals of 1852 trauma patients throughout their length of ICU stay. After filtering, the power of BP measures to predict hospital death was enhanced. Therefore, we concluded that our strategy of removing non-physiological artifact was simple, fast and useful for an accurate assessment of BP measures in trauma patients
In this paper, two such topologies are presented. The first one consists of a shunt connected controllable source of reactive power, and two series connected voltage-sourced converters - one on each side of the shunt ...
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In this paper, two such topologies are presented. The first one consists of a shunt connected controllable source of reactive power, and two series connected voltage-sourced converters - one on each side of the shunt device. The second topology is a dual of the first; it is based on two shunt connected current-sourced converters around a series connected reactive compensator. In both cases the converters can exchange active power through a common DC circuit. Since both topologies make use of converters in addition to the (presumably existing) passive components, they can be regarded as hybrid, and the resulting FACTS controllers are thus named "hybrid power flow controllers", or HPFC. The analysis carried out that the HPFC offers performance characteristics similar to those of the UPFC. This paper presents some of the results. The rest of this paper is organized as follows. The HPFC topology that employs series VSCs is introduced. The steady state analysis is given and operating characteristics are derived. The dual topology, based on shunt connected current-sourced converters is presented
This paper analyzes the gains in delay performance resulting from network coding. We consider a model of file transmission to multiple receivers from a single base station. Using this model, we show that gains in dela...
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This paper analyzes the gains in delay performance resulting from network coding. We consider a model of file transmission to multiple receivers from a single base station. Using this model, we show that gains in delay performance from network coding with or without channel side information can be substantial compared to conventional scheduling methods for downlink transmission.
A new approach to achieve a switched-capacitor multiply-by-two gain-stage with reduced sensitivity to capacitors' mismatches is presented in this paper. It is based on sampling fully differential input signals ont...
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A new approach to achieve a switched-capacitor multiply-by-two gain-stage with reduced sensitivity to capacitors' mismatches is presented in this paper. It is based on sampling fully differential input signals onto both plates of the input capacitors rather than sampling onto one plate of the capacitors with the other tied to a reference. It uses one operational amplifier (op-amp) in two phases to produce the gain of two (times2). Comparing to the conventional multiply-by-two gain-stage, the mismatches between the capacitors has a much smaller influence on the accuracy of the gain of two (times2). Analytical and circuit-level analysis of the architecture and the conventional structure are presented using a generic 0.35mum CMOS technology
Unipolar and bipolar space charge injection and propagation is analyzed under simplified linear and Fowler-Nordheim charge injection conditions for parallel plane or needle-sphere electrodes stressed by a step voltage...
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Unipolar and bipolar space charge injection and propagation is analyzed under simplified linear and Fowler-Nordheim charge injection conditions for parallel plane or needle-sphere electrodes stressed by a step voltage. To verify our finite element numerical method, we first tested parallel plane electrodes with a simplified linear charge injection law for unipolar space charge propagation that showed good agreement with older closed form theoretical analysis. Finally, we analyzed tip-sphere electrodes for bipolar space charge propagation including Langevin recombination using finite element analysis.
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