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The ion selectivity of nanochannel due to the wall surface charges is capable of inducing strong coupling between fluidic and ionic motion within the system, which has been overlooked in the study of nanofluidics. This interaction opens up the prospect of operating nanochannel as nanoscale devices for electrokinetic energy conversion. However, the very short channel lengths make the ionic movement...
Aiming at improving the detecting probability of weak target and adaptability in multi-clutter background, a new CFAR processing method based on DB4 wavelet (WT-FS-CFAR) is proposed. The proposed method can deal with the wavelet coefficients of the echo signal adaptively and reconstruct a new echo signal. Compared with typical CFAR processor, experimental results show that the proposed method could...
In this study, reactive-ion etching (RIE) of Ge in different ambient was systematically investigated. Several dominant parameters (applied power, gas flow rate and gas compositions) during the etching were considered to improve the profile of 3D Ge structures. Besides, it was experimentally confirmed that to obtain Ge sidewalls with small roughness and a large angle, adding O2 and an appropriate masking...
This paper propose a mathematical formulation of energy management problem and its implementation in an energy management system (EMS) for isolated neighboring multi-microgrids. Using the model predictive control technique, the optimal operation of the microgrids is determined by utilizing an extended horizon of prediction and evaluation, which allows a proper scheduling of the energy storage units,...
As the rapid growth of computing demand in cloud computing, the virtualization of data center network is more and more deployed. The data center is reconstructed to Software Defined Data Center with the technical of Software defined network. The services of data center are formed into Virtual Data Center, which is based on the virtual resource collection of the physical network section. So the VDC...
This paper mainly introduces the method for realizing storage control with a direct control of Hard Disk by using FPGA and DSP. And it uses a FIFO as a data cache so that the storage requrements for 80k Hz data sampling rate system can be satisfied.
In order to decide a medical treatment plan for a patient, experts from different disciplines should come together to discuss. This process is often time-consuming and organized in an inefficient way. A multi-disciplinary medical treatment decision support system is proposed and developed in order to speed up this process. Specifically, this system can recommend treatment plan according to a patient's...
Aiming at the fast processing demands of large batches of UAV data processing in Photogrammetry, this paper studies the GPU acceleration matching method guided by Position and Orientation System (POS) and combined with RANSAC method for excluding mismatching points. Experiments are carried out according to the Songshan Calibration Field's Mapping Project. Firstly, three groups of stereo image pairs...
Rumors can spread fast on Online Social Networks (OSN) which may cause serious public issues. Thus the detection of rumors on OSN has become a hot research topic in recent years. While most of the previous work proposed some supervised methods like classification to deal with the rumor detection problem, we view the rumors as outliers among the recent Weibos posted by a user and propose a novel outlier...
We present widely tunable continuous-wave terahertz (THz) mode-beating signal generation based on an InP photonic integrated circuit (PIC) including a pair of 1.55-pm DFB lasers with integrated semiconductor optical amplifiers (SOA). Continuous THz signal from 40 GHz to 1.0 THz has been demonstrated.
Planetary gearboxes play a significant role in helicopter transmission system. Fault diagnosis of planetary gearboxes is a key topic for health monitoring and maintenance of helicopter. The vibration signals of faulty planetary gearboxes have complicated spectral structures due to its distinctive and complex structure and time-variant running operation condition, leading to the difficulty in fault...
This paper presents a novel method based on delaying Hall signal for reducing torque ripple of brushless DC motor. During the delayed interval, the back electromotive force (back-EMF) amplitude of outgoing phase declines and the phase current rises to stabilize phase voltage. The electromagnetic torque can remain steady by regulating the duty ratio. During the commutation interval, the time of outgoing...
Several metasurface-based terahertz (THz) devices, including lens, computer generated holograms, spin selected focusing lens, as well as wavelength selected diffractive elements, have been designed and fabricated. The thickness of these device is only 1/4000 of the working wavelength. A THz focal plane imaging system is employed to characterize the function of the devices. Theoretical expectations...
To push the development of surface plasmonic devices (SPDs), a practical characterization means is essential for accurately observing a THz surface wave (TSW). In this work, a THz digital holographic imaging system is employed to coherently characterize temporal variations and spectral properties of TSWs excited by metallic sub-wavelength structures. Numerical simulations of experimental procedures...
We propose a meta-hologram for generating an abruptly autofocusing ring-Airy beam in the Terahertz (THz) band. The designed meta-hologram is composed of gold C-shaped slot antennas, which can be used to modulate the phase and amplitude of the scattered THz wave. A THz ring-Airy beam is generated and observed. The propagation process is also investigated in detail. This method can be expanded to other...
Wireless body area network (WBAN) has drawn more and more interests in recent years. As one alternative communication scheme for WBAN, human body communication (HBC) uses human body as the communication medium and it provides better performance for communication security, spectrum efficiency, power consumption, and electromagnetic compatibility. The aims of this paper are to measure and characterize...
The normalized projection misalignment (NPM), which is a measure of blind system identification (BSI), is studied in the context of multichannel speech dereverberation. The NPM errors are convolved with the multichannel equalization filters, and the angle between vectors obtained from channel-wise NPM errors convolving with equalization filters is computed. The mean squared error (MSE), which is a...
Cloud-based vehicular networks is a new paradigm to improve the vehicular services through distributing computation tasks between remote clouds and local vehicular terminals. To further reduce the latency and the transmission cost of the computation offloading, we propose a cloud-based Mobile Edge Computing (MEC) offloading framework in vehicular networks. In the framework, efficient computation offloading...
In battery-powered Cognitive Machine-to-Machine Communications (CM2M), the energy consumption, opportunistic data access capacity and interference to the licensed system need to be optimized simultaneously. We consider this as joint cooperative spectrum sensing and power allocation, and model this as a constraint multiobjective optimization problem of three objectives. Our model helps to find a Pareto...
To improve the power communication network risk assessment techniques, we proposed a network risk assessment method for power business. The method is based on the risk assessment relationship model consisted of communication network and power network. According to the risk caused by different levels business faults in physical link layer, network topology layer and business layer, the model uses probabilistic...
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