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As the cloud computing technique provides a great chance for promoting English teaching quality, in this paper, we aim to construct English writing teaching system by fully exploiting the intelligent cloud service platform. Cloud computing platform contains computer clusters and exploits distributed computation and virtualization technologies to integrate hardware and software into a unified resource...
This paper proposed a novel static magnetic field sensor which integrates a Terfenol-D rod with a Fiber Bragg grating Fabry-Perot(FBG-FP) cavity. In order to improve the performance of the sensor, a theoretical model about pre-stress and the magnetic field sensitivity is established. And the correctness of the model is verified by experiments. The experimental results show that the sensor has good...
Navigation in ice covered waters is a challenging and hazardous activity, threatening the ship herself and the environment. Proper evaluation of the attainable ship speed in ice prior to setting off the journey is essential to mitigate the risk of besetting in ice which may cause further damages. The majority of the existing models evaluating ship speed in ice are physics-driven requiring detailed,...
A feasible method of measuring the aircraft wing deformation based on fiber Bragg grating (FBG) is introduced. The strains of the wing can be obtained by means of FBGs attached on the surface of the model airfoil. A finite element model (FEM) is established to obtain the numerical analysis results of strain and deformation of the wing. The experimental deformation of the airfoil can be deduced by...
A static-strain FBG-FPs sensor with high resolution based on empirical mode decomposition (EMD) and wavelet algorithm is proposed. The FBG-FPs are interrogated by a narrow-linewidth fiber laser which is driven by an optical single sideband (SSB-SC) modulator. Adaptive basis functions which are denoised by wavelet algorithm can be extracted from two FBG-FPs' reflection spectra by EMD. Adaptive basis...
A high-resolution FBG sensor is proposed for crust deformation observation and earthquake monitoring. A narrow-linewidth tunable fiber laser is used to interrogate the FBG. The wavelength shift of the FBGs due to seismic signal is measured by swept optical suppressed carrier single sideband (SSB-SC) interrogation technique with a reference FBG. The self-noise level is tested to be lower than NHNM...
This research is about applying life cycle analysis in evaluations of research and innovation policy, especially for research infrastructures. It focused on gaining insights of management challenges or issues of research infrastructure in Taiwan by using scanning of previous policy documents, interviews and a focus group with stakeholders. The result found that many issues were derived from lacking...
Noises in the reflection spectra of fiber Bragg grating (FBG) typically limit the resolution of quasi-static strain sensor based on FBG. This paper introduces a new spectral noise suppression method based on empirical mode decomposition (EMD). The spectral noise suppression method is used to denoise reflection spectra from a pair of FBG-based Fabry-Perot interferometers (FBG-FPs) for achieving high...
This paper presents a fully distributed fiber acoustic sensing (DAS) system. Combined with the phase-sensitive optical time domain reflectrometry (Φ-OTDR) technology and phase generated carrier (PGC) demodulation technology, the system can detect and acquire seismic wave signal in real time. The system has a 3.05dB flatness of frequency response from 5Hz to 1kHz, which with sampling interval of each...
For the high-precision and long-aperture SAR, range shift errors are introduced by the residual errors after aperture-independent motion compensation, as well as the azimuth phase errors. Both the frequency domain methods and the time domain algorithms exist shortcoming when dealing with the problem, i.e. inaccuracy and huge computation, respectively. Limitations of these algorithms has been analyzed...
Following the development of digital technology, controllers in many control applications are implemented on digital platforms. Although the advantages of event-triggered controllers are proposed and practical applications show their potential, relatively few theoretical results appear to study event-triggered control for switched linear systems. It is the objective of this paper to propose an event-triggered...
We present a novel 3D self-adaptive nerve electrode for high density nerve signal recording and site-specific stimulation. Specifically, a new pre-shaped flexible spiral structure has been developed in order to achieve tight contact with small nerves without any additional mechanical locking structure or force. This unique structure enables the nerve electrode to adapt and maintain close contact with...
A fiber optic accelerometer-magnetometer (FLAM), which can measure acceleration and magnetic field simultaneously, based on fiber laser sensing is proposed. The principle of the FLAM and the theory of the decoupling the signals of acceleration and magnetic field are presented. The FLAM was interrogated using phase-generated-carrier (PGC) method. A test of simultaneously measuring acceleration and...
Object recognition the is an important step for the high-level visions processing tasks, such as security managing, and abnormality event analysis. In this paper, we address these challenges of abnormal water surface monitoring in real-world unconstrained environments where the background is complex and dynamic. In the algorithm proposed, firstly we extract the Gaussian-Hermite moment features of...
With the increasing amount of image data, the image retrieval methods have several drawbacks, such as the low expression ability of visual feature, high dimension of feature, low precision of image retrieval and so on. To solve these problems, a learning method of binary hashing based on deep convolutional neural networks is proposed. The basic idea is to add a hash layer into the deep learning framework...
A fiber optic seismometer based on π-phase-shifted FBG (π-FBG) is proposed. The static wavelength/strain of the π-FBG is measured by swept optical suppressed carrier single sideband (SSB-SC) interrogation technique with a reference FBG resonator. A broadband (DC-50 Hz) wavelength/strain with 0.0006 pm (0.47 nε) resolution is demonstrated. As a reasonable double-diaphragm acceleration model is realized,...
In this work, a three-dimensional (3D) simultaneous arbitrary-way orbital angular momentum (OAM) generator is presented. The proposed generator is constructed by a group of transformation cylinders filled with metamaterials. Using transformation cylinders, arbitrary-way planar wave fronts can be simultaneously converted to helical wave fronts with arbitrary topological charges. Firstly, the principle...
Sentiment analysis is one of the most popular natural language processing techniques. It aims to identify the sentiment polarity (positive, negative, neutral or mixed) within a given text. The proper lexicon knowledge is very important for the lexicon-based sentiment analysis methods since they hinge on using the polarity of the lexical item to determine a text's sentiment polarity. However, it is...
Considering maintenance resources assignments of the large-scale complex equipment, the policy that single repairman has multiple vacations is utilized to analyze a warm standby repairable system. The former models that the known conditions are usually assumed to follow exponential distribution or other typical distributions have many constraint conditions. It is assumed that the online component...
It is expected that muti-core systems will become the dominant computing platform in the next few years. However, the current programming models (such as Java, .Net etc.) do not scale well to exploit the computing power of such multi-core systems. In primitive programming paradigms there exist implicit dependencies between code and program states, and compilers cannot exploit the potential concurrency...
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