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A low refractive index liquid-core fiber is formed under anti-resonant guidance mechanism with broad transmission band and single modeness. A Raman spectroscopy experiment shows the versatility of this fiber platform for biochemical sensing.
Autonomous underwater gliders (AUGs) are autonomous vehicles that propel themselves by changing their buoyancy through the ocean. For ocean observations, AUGs have unparalleled advantages that can operate in all weather conditions, for long time periods, and in remote locations. However, AUGs have limitations such as instrument and flow noise, which are undesired. To obtain the valid information from...
For a better understanding of how different diseases (e.g. neurovascular diseases, neurodegenerative diseases, and musculoskeletal pain conditions) affect human motor function, a uniform, standardized and objective evaluation is a desirable goal expressed within the clinical community. We explore the capabilities of an augmented reality (AR) game that uses free hand interaction to facilitate an objective...
This paper presents a guidance law design for synchronized path following of multiple underactuated unmanned surface vehicles (USVs) without using a global reference velocity. Firstly, a distributed observer is proposed to eliminate the need of reference velocity known to all the vehicles. Secondly, a line-of-sight based guidance law is derived to force each vehicle to follow a parameterized path...
Bioelectrical impedance technology is considered to be a noninvasive method of measuring heart function. Feature points extraction of impedance cardiography (ICG) signal is vital to cardiovascular disease diagnosis, and feature points extraction has curative value after operation. In this paper, the new algorithm combined with the wavelet technology to extract feature points accurately. Feature points...
With the development of information technology, the electric power system has gradually entered a new stage. And the security problem of electric power system has become an important research filed. In this paper, we applied wavelet technology and digital watermarking algorithm to improve the security level of the electric power system. This two technologies can complete sensitive information hidden...
In opportunistic networks, forwarding based protocols lead to a large amount of data flow to the highly connected nodes and unfairness of the nodes' traffic load, finally, it makes the highly connected nodes suffer congestion and results in the messages were discarded. To solve this problem, a congestion control algorithm based on Social Awareness is proposed in this paper. When choosing the next...
Generalized eigenvalue proximal support vector machine (GEPSVM) is regarded as a milestone in the development of the powerful SVMs. It is more suitable to solve the XOR problem than SVM, meanwhile, it is faster. However, GEPSVM and SVM do not consider the local geometrical structure information of training samples. In this paper, we propose a bounded locality preserving distance based generalized...
Most techniques for dealing with imbalanced data classification in SVM-related methods are sampling, weighting and ensemble strategies, which aim at balancing the importance of different classes when computing the decision boundary. But how to choose and design an appropriate balance strategy is still a difficult problem. In this paper, we propose a between-class discriminant twin support vector machine...
In the current research, a small strain multi-scale constitutive model based on self-consistent method is developed to describe the rate- and temperature-dependent behavior of cyclic deformed Sn-0.7Cu solder. A modification is proposed on the traditional elastic plastic self-consistent (EPSC) model to capture the elasto-viscoplastic behavior of Sn-0.7Cu solder. A modified Voce hardening law is proposed...
Temperature control has received widely attention in open-cathode PEM fuel cell system, due to the importance of stack temperature to the output performance of the stack. The open-cathode PEM fuel cell is such a nonlinear, time varying and uncertain system which increases the difficulty of establishing a control-oriented mechanistic model. In this paper, the on-line T-S fuzzy identification method...
Peer-to-Peer (P2P) architecture is an appealing alternative to centralized architecture, especially for large-scale distributed internet applications. Owing to the similarity between human social networks and P2P social networks, where peer nodes are considered as persons, connections between peer nodes are considered as relationship, human social theories are used to construct P2P social network...
An efficient preconditioner for analysis of electromagnetic scattering and radiation of the composite dielectric and thin conductive plate objects is proposed in this paper. In the conventional method, metal and dielectric are generally considered to be independent to each other. Therefore the accuracy of the solution cannot be guaranteed, when dealing with radiation problems. While the traditional...
The purpose of the paper is to propose a new control scheme in active front steering (AFS) for vehicle stability using disturbance observer method. In the paper, the ideal yaw rate can be calculated on the linear two-degrees-of-freedom vehicle model. In addition, the actual sideslip angle can also be estimated by using a state observer. Based on this, two kinds of baseline AFS controllers are proposed...
This paper is concerned with the disturbance estimation and state recovery of autonomous surface vehicles in the presence of uncertainty and unmeasured surge, sway, and yaw velocities by using the position-yaw measurements only. The uncertainty stems from parametric model uncertainty, unmodelled hydrodynamics, and external disturbance, which are induced by wind, waves and ocean currents. By using...
A novel kind of hierarchical loop-flower basis function is proposed to solve the low frequency scattering problem. The hierarchical loop-flower is defined on a hierarchical mesh. The hierarchical loop basis function is used to expand the solenoidal current and the hierarchical flower basis function is used to expand the nonsolenoidal current and thus the low frequency breakdown problem can be remedied...
In this paper, a distributed guidance law at the kinematic level is developed for coordinated maneuvering of networked fully-actuated autonomous surface vehicles with a virtual leader that moves along a parameterized path. We design the distributed guidance law based on the constant bearing guidance scheme and a path maneuvering design. We prove that the error signals in the closed-loop guidance system...
The 2-μm waveband has gained much attention due to its potential applications in data communications and optical sensing. This wavelength range is of particular interests for integrated platform as it is transparent for silicon and is free of two photon absorption. We experimentally demonstrate a 2-μm silicon focusing grating coupler with subwavelength structure. The theoretical coupling efficiency...
The purpose of this paper is to find the relationship between coal metamorphic and adsorption of Carbon Monoxide(CO) and reveal the source of CO in mines. Through preparation and industrial analysis of coal samples, mercury injection experiment and analysis of different metamorphic grade coal samples, to analysis the impaction on coal metamorphic grade of CO adsorption. Research shows with the increase...
Angular super-resolution imaging plays a significant role in the area of the scanning radar imaging. Some deconvolution methods are used to realize the angular super-resolution on scanning radar. However, the ill-posed nature of the deconvolution problem means difficulties and inaccuracies in the search for the solution. In this paper, we present a novel method for angular super-resolution imaging...
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