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A high-sensitivity temperature sensor based on a singlemode-multimode-polymer filled hollow core fibre-multimode-singlemode (SMHMS) fibre structure is proposed. This sensor was made from a short section of hollow core fibre filled with a high thermo-optic coefficient (TOC) polymer with a refractive index close to that of the fibre cladding, fusion spliced between two singlemode-multimode (SM) fibre...
In this paper, a novel technique was proposed to improve the sensing performance by employing wavelength diversity in Brillouin optical time domain reflectometry (BOTDR). This technique enables to maximize the launch pump power to achieve a higher measurement accuracy, without activating the nonlinear effects, which limit the conventional BOTDR performance. Experimentally, we have demonstrated the...
This paper reports post-annealing of zinc oxide (ZnO) films on flexible foil substrates in order to improve the functional and acoustic wave sensing performance. ZnO films of 5 $\mu \text{m}$ thick were deposited onto aluminum foils (50 $\mu \text{m}$ thick) using magnetron sputtering and then annealed in air at different temperatures between 300 °C and 500 °C. Effects of post-annealing on structural,...
This paper suggests a new fast chaos-based image cipher with a permutation-diffusion structure. In the permutation stage, the original image is scrambled by swapping each pixel with another one at a location chosen by a pseudorandom permutation generated from the logistic map. The initial condition of the map, i.e. the permutation key, is determined by the CityHash value of the original image. Owing...
Human pulse recognition is an important part of the objective study of Traditional Chinese Medicine (TCM). In the current human pulse recognition methods, there are many feature extraction algorithms but many are complex and redundancy exists in the features selections. This paper focused on the typical convolutional neural network (CNN), and designed a 9-layer CNN which can be used to human wrist...
Bead-based immunoassay has been growing as a promising technology in the point-of-care diagnostics due to great flexibility. For samples with dilute analytes, the colloidal particles can concentrate dispersed analytes and act as carriers for advanced particle manipulation. To realize a rapid in-situ immunoassay, Firster resonance energy transfer (FRET) was used herein to ensure only the target antigen...
In this paper, we discuss the scheduling problem of assigning jobs on multiple parallel machines with mold constraints. The mold constraint specifies that each job needs to be processed with specific molds on a machine and there is an arbitrary amount for each type of molds. Besides, different machines can mount different molds. Setup time is also considered when a first job in a machine starts or...
Currently, many companies face dual pressures of bearing the cost of harmless treatment for industrial waste and the continuous rising of the price of raw materials and energy. In order to solve this problem, many industrial wastes from other companies are purchased to substitute the raw materials or energy, at the same time, it sales the industrial wastes of themselves, so the industrial symbiotic...
Recently, Wireless Body Area Networks (WBANs) have been an attractive platform for pervasive computing and communication. Since the patient-related data is significance for medical diagnosis and patients' health-care, the security of distributed data storage is critical need for applications. However, the distributed architecture makes it challenging to build a secure and efficient data storage system...
This paper presents an algorithm to improve the time and space complexity of reverse hash chain traversal. Mapping the traversing of a reverse hash chain to the inorder traversing of a binary tree, the proposed algorithm chooses auxiliary nodes saved by stack dynamically with the help of the binomial tree model, and achieves low time and space complexity for the traversing of a reverse hash chain...
As wireless sensor networks (WSNs) are susceptible to attacks and sensor nodes have limited resources, designing a secure and efficient user authentication protocol for WSNs is a difficult task. Considering that most future large-scale WSNs follow a two-tiered architecture, we propose an efficient and Denial-of-Service resistant user authentication scheme for two-tiered WSNs, which imposes very light...
In this paper, the auxiliary equation method is used to seek exact solutions of a 3-dimensional KdV equation. As a result, topological 1-soliton solutions are successfully obtained with the aid of symbolic computation. It is shown that the auxiliary equation method is a very effective and powerful mathematical tool for solving nonlinear evolution equations in mathematics and physics.
Some navigation applications, such as the navigation of blind users, require that a continuous positioning is performed in combined outdoor urban and indoor environments with a certain positioning accuracy. For outdoor urban environments usually GNSS and dead reckoning are employed and has proven to be satisfactory. In indoor environments, however, absolute position determination with an accuracy...
This paper presents a novel compensation current detection approach for DSTATCOM under unbalanced conditions based on the improved instantaneous symmetrical components. The principle of the proposed approach is based on the real-time rotating vector which enables calculate the positive sequence component, negative sequence component and zero sequence component of the three phase instantaneous variables...
Using multicast technology can significantly reduce energy consumption and prolong the life time of nodes in query-based wireless sensor networks (WSNs). Existing multicast protocols for WSNs mainly focus on covering multicast-scope zone effectively, and assume secure communication between all nodes. In order to satisfy security requirements and control of energy consumption, we present Steiner-based...
The aim of this paper is the detection and parameter estimation for multicomponent linear frequency modulation (LFM) signals based on Hilbert-Huang Hough transform of the signals. The proposed method iteratively decomposes the multicomponent LFM signals into monocomponent LFM signals and applies Hilbert-Huang Hough transform to each LFM component, which is a mapping from the time domain to the parameter...
This paper have focused on the parameter estimation for multicomponent linear frequency modulation (LFM) signals using EMD based fractional Fourier transform. The proposed method iteratively decomposes the multicomponent LFM signals into monocomponent LFM signals and applies fractional Fourier transform (FRFT) to each LFM component, which is a mapping from the time domain to the fractional Fourier...
Connected to high-voltage power system directly, electrified railway is a particular user to power system, and its loads have the characteristics such as non-liner, asymmetry and volatility and so on. Researched on Chunshen traction substation which belongs to Shanghai-Hangzhou electrified railway, and accorded to the requirements and characteristics of comprehensive management to harmonics, reactive...
On the basis of time-reversal focusing theory, time frequency analysis combining with time reversal mirror (TRM) on detection of linear frequency modulation (LFM) signal in inhomogeneous medium is studied. The simulation experiment on time frequency analysis is carried out in a lab water tank. Time reversal is manifested by taking the time-domain scattered fields received on an array, reversing them,...
A photovoltaic (PV) grid-connected power conditioning system with the function of uninterruptible power supply (UPS) is presented in the paper. It can not only realize photovoltaic generation, but also has full function of shunt active power filter (APF). In addition, it can act as UPS when instantly power interruption occurs. The instantaneous reactive power theory is employed in harmonics current...
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