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With the extensive use of sophisticated image editing software, it has become easy to manipulate digital images without any visually visible clue. Copy-move is a special type of image forgery performed by copying a part of the image and pasting anywhere else in the same image. We proposed a passive image authentication technique to determine the copy-move forgery. First, the method divides the image...
We report the experimental discovery of intrinsic ferromagnetism in Cr2Ge2Te6 atomic layers by scanning magneto-optic Kerr microscopy. In this 2D van der Waals ferromagnet, unprecedented control of transition temperature is realized via small magnetic fields.
We report on on-chip quantum entanglement between two microscopically separated qubits by engineering their long-range interactions via a metasurface. The metasurface route to quantum state engineering opens a new paradigm for on-chip quantum technology.
We show the manipulation of spin flow of light in valley photonic crystals. Due to the coupled valley spin physics, both photonic valley Hall effect and unidirectional spin flow are realized in bulk crystal.
Grid connection of distributed generation would have a certain impact on safe and stable operation of receiving-end network, so systematic analysis on it would be significant. The method for comprehensive assessment on effects caused by grid connection of distributed generation on power grid is presented. The assessment system is divided into steady-state operation assessment, reliability assessment,...
For long-distance transmissions, relay-aided transmission technique is a promising solution to improve the performance for the free-space optical (FSO) communications. In this paper, a serial decode-and-forward relay-aided FSO communication system is considered. In the system, the main noise is Gaussian noise, however, with a noise variance depending on the current signal strength. Moreover, a composite...
This study aims to design an adaptive output recurrent cerebellar model articulation controller (AORCMAC), which is embedded into the direct torque control (DTC) system of an induction motor as the speed controller. Similar to the conventional cerebellar model articulation controller (CMAC), the designed AORCMAC also has the advantages of rapid learning, simple architecture, online training, and nonlinear...
Outdoor vehicular visible light communication (V2LC) has been proposed recently as a new solution to increase road safety and realize autonomous driving. This paper investigates the outage probability performance for the outdoor V2LC system. In the system, the main distortion is caused by the ambient-induced shot noise and the thermal noise. By considering the impacts of path loss and atmosphere turbulence,...
Recently, the physical-layer security, which exploits the channel characteristics in order to hide information from unauthorized receivers and does not reliance on the upper-layer encryption, has been proposed as a promising complement to the traditional security schemes. In this paper, the lower bounds on secrecy capacity for indoor visible light communications (VLC) are investigated. The noise is...
This paper investigates the type-2 T-S fuzzy multiple feedback-loop guaranteed cost controller design for uncertain singular systems with transmission and state delays. Based on the type-2 T-S fuzzy theory, this work constructs a mathematical model for a class of nonlinear uncertain singular time-delay systems. Using the parallel distributed compensation concept with Lyapunov theory and linear matrix...
We optimized micro-holes in a thin slab for fast Si photodetectors at wavelength 800–950nm. Lateral modes are shown to be responsible for the effective light trapping. Small disorder and cone hole shapes helped achieve uniform quantum efficiency in a wide wavelength range.
In mobile wireless sensor networks (MWSNs), each sensor has the ability not only to sense and transmit data but also to move to some specific location. Because the movement of sensors consumes much more power than that in sensing and communication, the problem of scheduling mobile sensors to cover all targets and maintain network connectivity such that the total movement distance of mobile sensors...
Recently, the optical spatial modulation (OSM) technique has been proposed for visible light communication (VLC). However, its design flexibility is limited by the fact that the number of transmitters has to be a power of two, given that the number of bits mapped by the transmit antenna index at each time slot is required to be an integer. In the paper, to break the limitation on the required number...
A broadband rat-race coupler is proposed with planar configuration. Stepped-impedance and coupled transmission lines are utilized. Due to the symmetric structure, it is easy to design such a component by the even-/odd-mode analysis. A prototype is optimized to demonstrate our idea. The central frequency is 1.37 GHz with a 52% relative bandwidth. The return loss and port isolation are both better than...
A new multifunctional quadrature coupler is proposed and developed at 2.0 GHz, with a 70.7% wide operating band, good frequency selectivity, and high harmonic suppression over 30 dB at 6.0 GHz. It is realized with EBG-/DGS-loaded arms and open-ended coupled lines. With the properly selected critical parameters, arbitrary power division ratio, such as 2:1, can easily be achieved. The measured and simulated...
The emergence of many heterogeneous sensor systems on the Web has produced huge amounts of sensor data. This requires building the customized and automated processing methods, which can be formed by connecting the services on the Web. Based on the semantic Web services markup language named OWL-S, the algorithms for processing sensor data on the Web are represented as the service ontologies and become...
Stirling power generating system, which has the advantages of multiple energies applicable and high efficiency, is promising for aerospace applications. As the main part of Stirling power generating system, single-phase oscillating permanent-magnet linear machine (PMLM) is investigated in this paper. Firstly, the electromagnetic performances, such as no-load back electromotive force (EMF) and thrust,...
This paper proposes a auditory system based on microphone array and composed of three parts: noise suppression, sound source localization (SSL) and beamforming. The ego-noise is harmful to the auditory system embedded in a small robot and very hard to be suppressed. We have proposed a method to design active acoustic metamaterials (AAMMs) that perform extremely well in the ego-noise suppression in...
Bonding front propagation driven by the work of adhesion is restricted by the air drag and mechanical deformation of wafers. Energy variation during room temperature bonding can influence the bonding initiation and front propagation dramatically. In order to evaluate the dissipated energy and elastic strain energy resulting from the air cushion and the wafer bow, both theoretical and finite element...
A narrow pulse driver circuit was studied in this paper. we proposed and demonstrated a method combining the analog circuit and the digital circuit. By analyzing the working principle of transistor, we selected the HEMT transistor as a high-speed switch. It can supply voltage pulse or current pulse according to different applications. The generation of trigger signal, controls of the pulse width and...
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