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We propose a novel mode converter (MC) based on multimode interference (MMI). This MC taking advantages of long-period fiber grating and multimode interference, it not only has high conversion efficiency, but also greatly reduces the interference between modes.
Direct position determination (DPD) determines the target localization directly from the raw observations, which is superior to traditional methods estimating related parameters firstly. However, DPD is based on maximum likelihood (ML) estimator with large data transmission and computational cost. In this paper, we develop low complexity beamspace DPD (BS-DPD), converting the raw data into beamspace...
Due to the uncertainty and random nature of ocean waves, the accurate prediction of ship attitude is hard to be achieved, especially in high sea states. A ship attitude prediction method using Input Delay Neural Network (IDNN) is proposed in this paper. One of the advantages of this method is that it takes the measurements of Microelectromechanical Systems (MEMS) gyrosocpes, besides ship Euler angles,...
Opinion dynamics and its understanding in social networks is an emerging field of research in recent years. Existing work mainly considers direct exchanges of opinions among agents under certain conditions. This paper addresses a problem where the agents of a network make and exchange decisions repeatedly in a multi-hypothesis scenario and learn from the neighbors' decisions. Two models are proposed...
Light field cameras generate low-resolution images due to the tradeoff between spatial and angular resolution. Traditional light field super-resolution (LFSR) methods depend on prior knowledge of depth information. This paper presents a projection-based LFSR solution without prior information based on redefinition of the mapping function between disparity and shearing shift. Moreover, simplified variational...
The output of the attitude determination systems suffers from large errors in case of accelerometer malfunctions. In this paper, an attitude estimator, based on Virtual Horizontal Reference (VHR), is designed for an Attitude Heading and Reference System (AHRS) to cope with this problem. The VHR makes it possible to correct the output of roll and pitch of the attitude estimator in the situations without...
For the problems and deficiencies of the current farmland solid remote monitoring system, this paper introduces a kind of farmland solid remote monitoring system based on embedded technology and BS mode, the system achieves data acquisition and A / D converting, sending monitoring data to CDMA through serial port, converting the data to TCP/IP data packets, sending the data by using CDMA DTU, connecting...
Satellite tracking is a challenging task for marine applications due to the disturbance from ocean waves. An Attitude Heading and Reference System (AHRS) for measuring ship attitude, based on Microelectromechanical Systems (MEMS) sensors, is a key part for satellite tracking. In this paper, an adaptive Multiplicative Extended Kalman Filter (MEKF) for attitude estimation of Marine Satellite Tracking...
Marine Satellite Tracking Antenna (MSTA) is a necessary device in ships for receiving satellite signals when they are sailing on the sea. This paper presents a simple methodology to obtain the dynamic equations of MSTA through Lagrange method, which is fundamental in design of modelbased controllers. The detailed derivation procedure of using basis vectors of coordinate system, is presented. Moreover,...
Opinion dynamics in social networks has been widely studied in recent years, mostly by considering exchanges of opinions among neighboring agents. This paper addresses a scenario where the agents make decisions repeatedly on two hypotheses and where agents only exchange decisions. Motivated by the Bayesian models in the literature of human cognition, we model this learning procedure by the Bayes'...
In this paper, a nonlinear attitude estimator is designed for an Attitude Heading and Reference System (AHRS) based on Micro Electro-Mechanical Systems (MEMS) sensors. The design process of the attitude estimator is stated with detail, and the equilibrium point of the estimator error model is proved to be asymptotically stable using LaSalle’s invariance set theorem through limitation of the range...
Presoaked basalt fiber concrete (PBFC) is a new kind of concrete reinforced with random short presoaked basalt fibers. In the paper, the applicability of the presoaked basalt fiber (PBF) as a strengthening material was investigated through various experimental works for mechanical characteristics and strengthening effects by changing its dosage and length, and compared with ordinary concrete. Experimental...
In this paper, we consider the problem of social learning in a network of agents where the agents make decisions repeatedly on two hypotheses. At every time slot, each agent in the system obtains sequentially a private observation that is independently generated under one of the hypotheses, and makes a decision on choosing the true hypothesis. The private belief of each agent is the posterior of one...
A detection method for bridge over dry-season-river is proposed in this paper, from high resolution remote sensing (RS) image. Traditional bridge detection methods excessively depend on characteristics of water. However, when the river is in the dry season, water characteristics will not be reliable, and large errors will be obtained on the riverside-part. To solve this problem, a two-stage detection...
To save fuel consumption of the vehicle, researched the vibration energy harvest, it was crucial aspect of technology development for the vehicles. This paper constructed system of the vibration harvest for the suspension of the vehicle by SIMULINK software, firstly we predigested theory model of the suspension of the vehicle, Secondly built simulation system of the suspension on the basis of theory...
We report an experiment to demonstrate a quantum permutation determining algorithm by employing photon polarization and spatial modes. This work displays the remarkable speedup of quantum algorithm and strong universality in quantum computation.
In this paper, we consider the problem of social learning in a network of agents where the agents make decisions onK hypotheses sequentially and broadcast their decisions to others. Each agent in the system has a private observation that is generated by one of the hypotheses. All the observations are independently generated from the same hypothesis. We study a setting where the agents randomly choose...
Eigenspace-based beamformer and dominant mode rejection are robust against DOA mismatch and array model mismatch when SNR is proper. While the former algorithm suffers from performance break down at low SNR and at high SNR, the performance of the latter degrades. We propose a principle to judge the level of the SNR based on random matrix theory. The idea of random matrix theory is to identify the...
Currently, HD videoconference becomes more and more prevalent. The bit rate of HD videos is large, so effective compressing scheme is very important. A static or gradually changed background in a global manner is an important characteristic for videoconference. H.264/AVC, which is the state-of-the-art codec, performs well, but it is not efficient enough for videoconference since it cannot fully exploit...
Auxiliary power unit (APU) is one major power source in extended-range electric vehicle. A new control strategy of auxiliary power unit applied in extended-range electric vehicle (EREV) is proposed in this paper. Considering the electric bus work requirements and road conditions, the bias-limited control strategy oversees the variable SOC and can be modified automatically, assuring its declining trend...
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