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In this paper, we investigate the problem of intelligent jamming design to attack a legitimate multiuser DS-CDMA downlink communication system. As the most common and realistic scenario, neither the channel state information (CSI) nor legitimate users' spread sequences (signatures) are known to the jammer. Therefore, the first task before intelligent jamming design is to acquire the necessary information...
In this paper, a fast online parameter estimation scheme with sinusoidal d-axis current injection is introduced. Compared to the existing parameter estimation strategies, the proposed estimation scheme has relative faster convergence time and is feasible in the transient operation. This estimation scheme is realized by the recursive least square algorithm based on different operating points of the...
In this study, the parameters of magnetic absorbing materials were measured and used to predict their effectiveness at reducing total radiation power from a heat sink. The parameters of absorbing materials were measured using a transmission line method and fitted using the Debye model. By comparing S-parameters and power loss between a simulated and measured microstrip line, the fitted material parameters...
Fault detection in wireless sensor networks is a crucial and challenging task. Many detection approaches relying on specific rules or inference models have been proposed to distinguish faulty sensors by exploring spatial-temporal correlations among sensor readings. However, these approaches may require high communication overhead or computational cost, and many potential faulty sensors that may not...
Metal-transparent-metallic-oxide (MTMO) grayscale photomasks fabricated by laser-induced oxidization are studied based on three stages oxidation theories and absorbed laser power density distribution. The calculated fabrication diameter is consistent with the experimental fabrication size.
A novel continuously tunable microwave photonic filter with both positive and negative coefficients is presented and experimentally demonstrated. In this paper, multi-wavelength optical carriers are generated based on all-optical mixing in an intensity modulator and a phase modulator. The positive and negative coefficients are realized using a phase modulator and two linearly chirped fiber bragg gratings...
Circulating Fluidized Bed Boiler (CFBB) is a nonlinear system with large time delay and strong coupling. Faced with the existing problems, a novel active disturbance rejection control (ADRC) design method is proposed based on effective open-loop transfer function (EOTF). The interaction effects for a particular loop from all the other loops are incorporated into EOTFs so that the system can be approximated...
This paper considers the problem of signal eavesdropping in direct-sequence code-division multiple-access (DS-CDMA) channels. We aim at extracting the information data symbols of all concurrent users in a DS-CDMA system without the knowledge of spreading sequences (signature waveforms), and channel state information (CSI) as well as no availability of pilot signaling (training sequence). We first...
Fault detection plays a crucial role in wireless sensor networks (WSNs). Many fault detection approaches requiring a priori knowledge of network faults have been proposed to distinguish faulty sensors by exploring spatial-temporal correlations among sensor readings. However, many faulty sensors that may not generate anomalous sensor readings, and potential failures with unknown types and symptoms...
In this paper, a Lyaupnov based finite control set model predictive direct torque control for the permanent magnet synchronous machine (PMSM) is proposed. In the proposed control scheme, the finite control set prediction and the Lyapunov theory are combined to minimize the torque ripple. The 8 voltage vectors of the 2-level converter are utilized as a finite control set for the torque prediction of...
Sensors easily become faulty and unreliable subject to limited battery and insecurity. Data Fault is one of traditional faults in the wireless sensor networks. Data fault mainly uses distributed method through exchanging neighbors' measurements and voting for decision. But the detection accuracy performance is easily influenced by unbalanced fault distribution. Based on this, we propose the k-means...
This chapter describes the following aspects of blood–brain barrier (BBB) uptake transporters: evidence of apical or luminal expression on the BBB, substrate specificity, structure‐activity relationship (SAR), feasibility, and limitations to apply the uptake transporters for central nervous system (CNS) drug discovery and strategies to address the limitations. It reviews luminal and abluminal expressions...
In this paper a novel adaptive Maximum Torque per Ampere (MTPA) control scheme of an interior permanent magnet synchronous machine (IPMSM) is introduced. To avoid an on- or off-line numerical calculation of the reference current for the MTPA curve, a reference model of the torque which is equivalent to the IPMSM with zero d-axis current is utilized to enforce the torque of the IPMSM towards its reference...
Superpixel generation is widely used in image segmentation. In this paper, we present an efficient flooding based superpixel generation algorithm. A new distance metric is defined for estimating pixels and seeds' similarity with COLOR, COMPACTNESS and SMOOTHNESS constraints. A seeds update strategy based on Lloyd's algorithm is adopted for optimizing seeds and superpixels' contour regions. Experimental...
This paper proposes a new control scheme based on maximum torque-per-ampere (MTPA) for speed controlled induction machines. In the MTPA scheme the torque- and flux-generating currents are calculated from the reference torque. In order to attain the reference torque in the constrained regions, the loss minimization curve can not be guaranteed anymore. Instead of the optimum current, the boundary values...
This paper focuses on a robustness controller and the performance of a permanent magnet synchronous machine (PMSM) with parameter uncertainty. The proposed controller is composed by a model reference adaptive current controller and a torque compensator. An internal model of the PMSM is introduced to define the transient reference behavior of the current and torque. A simple adaptation rule of the...
In many S-parameter measurements, one would desire to make the measurement with some other setup than what one has. There may be a test fixture required between the normal coaxial calibration planes and the DUT (Device Under Test); it may be useful to see the DUT performance with a certain matching network in place, and may be desired to see what the subsystem performance would be when the given DUT...
Microstructure evolution and temperature distribution of eutectic SnBi solder joint under high current density of 1×104A/cm2 at room temperature were investigated in the current study. With the increase of current stressing time, a continuous Bi segregation layer was formed and grew along the interface at the anode side, and a Sn rich region was found at the cathode side. Due to the microstructure...
High-performance mesophase pitch-based graphite fiber reinforced metal matrix composites offer a good thermal conductivity and tailorable coefficient of thermal expansion. These composites are regarded as a promising heat dissipation materials for electronic packaging application. It is reported that short graphite fiber/Al composites were fabricated by vacuum pressure infiltration, which is a suitable...
Modern distributed applications in high-performance computing (HPC) fields often need to disseminate data efficiently from one cluster to an arbitrary number of others by using multicast techniques. InfiniBand, with its high-throughput, low latency and low overhead communications, has been increasingly adopted as an HPC cluster interconnection. Although Infini Band hardware multicast is efficient...
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