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With the process of China's entering a serious aging society, it generally becomes one of the problems for people caring as elderly falls frequently. Thus, it is necessary for us find a way that the old people get help timely when it happened. On studies related to falls in outdoors currently, popular methods are on Computer Vision and Inertial Sensor. The problems of these researches are focus on...
Spectral testing and linearity testing are two important categories in ADC testing. The sampling clock quality is a crucial factor in ADC spectral testing. The cumulative clock jitter of the sampling clock generates power leakage in the fundamental component of the ADC output spectrum, and the random clock jitter increases the noise floor of the ADC output spectrum, which corrupts the spectrum result...
In this paper, the compressive sensing (CS) is introduced into fast multipole method (FMM) for the purpose of reducing the angle sampling rate in solving multi-static scattering problems. The scattered fields induced by all excitations on one scattering angles are viewed as the proceeded signal, which is sparsely sampled by CS. Then the Huygens principle is introduced to convert the sparse sampling...
This paper proposes a new order reduction approach for multidimensional (n-D) Roesser state-space model. The proposed approach is based on a certain system of equations which can be constructed from the well defined initial matrix constructed by the coefficient matrices of the given n-D Roesser state-space model. If there is a nonzero solution of the constructed certain system of equations, then the...
Two-dimensional zero-attraction projection (2DZAP) algorithm for single snapshot direction of arrival (DOA) estimation is proposed in this paper. Compared with the traditional DOA estimation, the proposed 2D-ZAP algorithm can estimate DOA exactly by ℓ-norm with the same number of sensors, although each sensor samples the signal only one time. In addition, 2D-ZAP algorithm can reduce the noise interference...
In recent years, with the shrinkage of the arctic sea ice area, arctic channel can be used for merchant ships. Different from the traditional channel, there are ice areas in arctic channel. Moreover, ice particles may enter into seawater cooling system of polar marines with the seawater. In the present study, Eulerian-Eulerian multiphase model coupled with the interphase heat and mass transfer model...
Wireless positioning in indoor environment is growing rapidly with the development of location based services. Among these technologies, fingerprinting positioning has been widely used, and its performance is satisfactory in precision requirement. The radio-map is the key to fingerprinting positioning. However, once the application scenarios changed, and the radio-map doesn't get updated in time,...
A major concern of the large-scale deployment of location based services (LBSs) is the safeguards of the user's location data collected by service providers, since person's location information may imply sensitive private information. Most existing techniques have addressed privacy protection mainly for snapshot queries. However, providing anonymity for continuous queries is important, since users'...
Most of the recent successful methods in accurate object detection and localization used some variants of R-CNN style two stage Convolutional Neural Networks (CNN) where plausible regions were proposed in the first stage then followed by a second stage for decision refinement. Despite the simplicity of training and the efficiency in deployment, the single stage detection methods have not been as competitive...
In this work, a new hyper-chaotic system based on memristor is proposed and the anti-synchronization is demonstrated. Through the analysis of the system behaviors, including the stability of equilibrium set, Lyapunov exponents and phase portraits, it demonstrates the proposed system is a new hyper-chaotic system with the features of infinite equilibrium points and complex dynamic characteristics....
A new hybridized algorithm is developed to solve the combined heat and power economic dispatch (CHPED) problem. Due to the non-convexity of the CHPED problem, the global optimum is difficult to achieve. The presented approach combines the algorithms of harmony search (HS) and Nelder-Mead (NM), and the hybridized algorithm is called the NM-HS algorithm. The hybridized NM-HS algorithm improves the efficiency...
Proximity detection is one of the critical components in Location-based Social Networks (LBSNS), which has attracted much attention recently. With the advent of LBSNS, more and more users' location information will be collected by the service providers. However, with a potentially untrusted server, such a proximity detection service may threaten the privacy of users. In this paper, aiming at achieving...
This paper proposes Recryptor, an energy efficient and compact ARM Cortex-M0 based reconfigurable cryptographic processor using in-memory computing. Recryptor is capable of accelerating a wide range of cryptography algorithms and standards, including public/private key cryptography and hash functions, by augmenting the memory of a commercial general purpose IoT processor resulting in a highly compact...
In this paper, we focus our attention on the Rényi entropy rate of hidden Markov processes under certain positivity assumptions. The existence of the Rényi entropy rate for such processes is established. Furthermore, we show that, with some extra “fast-forgetting” assumptions, the Rényi entropy rate of the approximating Markov processes exponentially converges to that of the original hidden Markov...
With the gradual popularity of location-based social network service, the localization technologies, for example the WLAN-based positioning technique, have become the premise of the service. Nevertheless, the positioning system is vulnerable to spoofing attack resulting in the user's identity divulged, due to the openness of the wireless network. The paper firstly implements a location cheating attack...
Optical microwave phase lock loop using semiconductor optical amplifiers is experimentally demonstrated. Bio-inspired by Eigenmannia and implemented with photonics, the proposed scheme is compact, has a simple architecture, and has a wide operating frequency range.
We present a soft silicone shape sensor for 3D surface shape measurement. The sensor is based on dual-layer fiber Bragg grating arrays with orthogonal mesh structure, which enable 3D bi-directional shape sensing.
Greedy algorithm is powerful and practical and has been used frequently in compressed sensing because it leads to relatively small calculation and is easy to be realized. GraDeS (Gradient Descent with Sparsification) is one of the greedy algorithms, which reconstructs signal by gradient iteration with hard threshold. However the sparsity of original signal is necessary in GraDes which means it is...
Filterbanks are widely used in many applications. In the literature, most filterbanks with irrational value coefficients were designed, while in practice, filters and filterbanks are implemented using rational coefficients. This paper introduces a powerful mathematical tool called Gröbner basis (GB)into the design of orthogonal filterbanks. Specifically, we use GB to find good rational lattice parameters...
In this paper, a new order reduction approach based on real eigenvalues will be proposed for Roesser state-space model of multidimensional (n-D) system. Compare with the existing order reduction approaches, the new order reduction approach can generate the Roesser model with a lower order. Moreover, corresponding examples are given to illustrate the details as well as the effectiveness of the proposed...
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