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This paper presents the design of a networked predictive control (NPC) based wide-area supplementary damping controller (WSDC) of SVC in order to damp the inter-area low frequency oscillations in large-scale interconnected power system. The major advantage of the proposed WSDC is that it can compensate constant and random communication delays existing in wide-area signals in an active way. Moreover,...
We propose a new technique for femtosecond pulse characterization — transient-grating self-referenced spectral interferometry. Using this technique, we built an extremely simple, alignment-free device and successfully sub-two-cycle 10-fs pulses at 1.75 μm.
In this paper, a novel endpoint detection algorithm based on spectrogram row self-correlation is proposed. Initially, the original speech signals are changed into speech spectrogram. In every spectrogram image the self-correlation of each row data is calculated. Therefore, in the coordinate of self-correlation curve the distances of adjacent extremes are chosen as characters used in speech endpoint...
Mg-Al layered double hydroxide (LDH) was modified with sodium dodecyl sulfate (SDS) by regeneration method. Modified LDH/polyethylene (SDS-LDH/PE) composites were prepared by melt blending and solution mixing method. Maleated polyethylene (PEgMA) was used to improve the compatibility between LDH and polyethylene (PE). The structure and the crystallization of composites were investigated by X-ray diffraction...
The global asymptotical master-slave synchronization problem of the identical chaotic Lur'e systems equipped with a sampling controller is studied. The discussed system is transformed into a system with a spacial time-varying delay at first. Then a novel Lyapunov-Krasovskii functional (LKF) is developed to obtain a less conservative synchronization criterion and thus the gains of the controller can...
To improve the switching performance of MEMS relays, carbon nanotubes (CNTs) have been used to provide a compliant layer on switching contacts. In this study a Gold coated CNT composite surface synthesized on a silicon wafer, was mounted on the tip of a piezo-electric actuator and mated with a Au coated hemispherical surface. The switching contacts were tested under conditions typical of MEMS relay...
In previous studies, an omni-directional walking support machine has been developed for people suffering from walking impairment. During walking support, the machine can identify the user's directional intention according to the user's forearm pressures and support the user to where they want to go. However, the motion performance of the machine is affected by the center-of-gravity (COG) shifts and...
We review our recent results in the development of nanostructured photonic metamaterials which provide unprecedented levels of active (nonlinear, switchable, tunable) control over light on the sub-wavelength scale.
Material transfer in switching contacts is considered at very low currents, (below 20mA). The transfer process is critical to a wide range of electronic switching technologies and is a limiting factor for MEMs relays. A test system is described and characterized for bench-marking surfaces. This is followed by a study of Multi-walled CNT's (MWCNT's), synthesized on a silicon planar and sputter coated...
To fix the more and more serious leakage problem in remote access to confidential data, the paper designs and implements a secure end-to-end browsing system with mobile composition. It enables mobile-authenticated users to browse confidential files stored at server side using their personal computers securely. The authentication function is in real-time such that the system can stop the browsing function...
The saturation of a current transformer (CT) will cause severe distortion in the secondary current. Each fundamental cycle of the secondary current consists of two portions, the unsaturated portion and the saturation. This paper proposes a morphological scheme for the detection of the saturations and an embedding and optimization scheme for the removal of the exponential decaying DC offset and the...
Discriminating between the magnetizing inrush and the internal fault of a power transform is a major challenge when designing differential transformer protection. In this paper, a novel method, which is based on mathematical morphology (MM) and artificial neural network (ANN), is proposed to solve this problem. Firstly, an MM based stage is used to extract shape features from differential currents,...
The attachment and detachment of target cancer cells from homogeneous and binary mixtures in antibody-functionalized microchannels have been studied experimentally. Under the same intermediate flow rate, the attachment rate was found to be higher, and detachment flow rate was lower, for cell lines expressing the target receptor at a higher level. For cells that do not express the target receptor,...
Ceramic liposomal nanoparticles, cerasomes, are functionalized with antibodies on their surfaces that act as targeting ligands. This is achieved by using the siloxane network present on the cerasome surface as the foundation for chemical treatment processes previously developed for silicon surfaces. The bio-functionality and physical integrity of the cerasomes are characterized demonstrating successful...
In digital forensics, data stored in a hard disk usually contains valuable evidence. Preserving the integrity of the data in the hard disk is a critical issue. A single hash value for the whole hard disk is not appropriate as the investigation may take a long time and latent sector errors (LSEs) (bad sectors due to media imperfection, for example) which cause a sector suddenly unreadable will make...
Dynamic states of cancer cells moving under shear flow in an antibody-functionalized microchannel are investigated experimentally and theoretically. A simplified physical model was adopted to analyze the cell motion; it features a rigid sphere, with receptors on its surface, moving above a solid surface with distributed ligands. The cell motion is described by the Langevin equation where the hydrodynamic...
This paper presents a novel method for current transformer (CT) saturation detection and compensation. In the method, CT saturation characteristics are represented by a partial nonlinear regression model. The parameters of this model can be estimated rapidly and accurately using both unsaturated and saturated sections of the waveform of a secondary fault current, even in a heavy saturation scenario,...
This paper presents a new method called Multi-objective Optimization by Reinforcement Learning (MORL), to solve the optimal power system dispatch and voltage stability problem. In MORL, the search is undertaken on individual dimension in a high-dimensional space via a path selected by an estimated path value which represents the potential of finding a better solution. MORL is compared with multi-objective...
This paper presents a wide-area damping controller (WADC) based on networked predictive control (NPC), of which the main purpose is to eliminate the impact of the communication delays of the wide-area signals from the wide-area measurement system (WAMS). The proposed WADC incorporates a generalized predictive control (GPC) to generate the optimized future control sequences and a network delay compensator...
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