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To improve the efficiency of particle swarm optimization, a quantum particle swarm optimization algorithm is proposed on the basis of analyzing the search process of particle swarm optimization algorithm. In the proposed algorithm, particles are endoded by qubits described on the Bloch sphere, each particle occupy three locations of the search space, and each location represents a optimization solution...
A dual shaped reflector system based on kinematic and dynamic ray tracing technique is developed to achieve a circular, collimated, and uniform beam from an elliptical Gaussian beam generated by the Quantum Cascade Laser(QCL) applied in terahertz holographic image system. Simulation result shows that the system has achieved ±0.7dB amplitude ripple and ±7 degree phase vibration for the output beam...
Unlike conventional “one shot” biometric authentication schemes, continuous authentication has a number of advantages, such as longer time for sensing, ability to rectify authentication decisions, and persistent verification of a user's identity, which are critical in applications demanding enhanced security. However; traditional modalities such as face, fingerprint and keystroke dynamics, have various...
The self-regulation of on-load tap changer (OLTC) transformation ratio is an important factor causing voltage instability. This paper introduces OLTC simulation models and their characteristics. Based on the sensitivity information, this paper deduces the voltage-regulating effect of OLTC in different load models with usage of the analytic method. The voltage-regulating effect of OLTC is very complicated...
Status of wind power's development and accommodation is introduced in Shandong power grid. Available capability of accommodating wind power in spring of 2013 is analyzed under the condition of load, power interchange, generation and power grid prediction. Based on wind power prediction, actual wind power accommodation capability is carried out through wind power restriction caused by constraint of...
In recent ten years, the problems related to voltage stability arise frequently worldwide. The intelligent algorithm, represented by fuzzy logic, neural network and genetic algorithm, has many applications in the analysis of voltage stability problems. This paper will mainly introduce such application.
Investigations into a device that separates one input signal into two signals of equal power, namely 3dB power divider, were carried out. This paper presents 3dB power divider using double layer metal slotted structure without any dielectric plate. The proposed structure with low coupling effect operates at 54GHz and has a 2GHz bandwidth. All the operating principles and simulation characteristics...
This paper designs a distributed low-rate DoS (LDoS) attack using random walk algorithm; random walk algorithm can be used in generating power-law distribution which complies with normal network behavior feature. In this attack pattern, the behavior of each distributed attack flows are normal and nonperiodic, while the superposed effect has the same damage degree as traditional square wave LDoS attacks...
In this paper, we investigate the possibility of using limited feature points (shape landmarks) from 3-D human body shapes to recognize the gender of human beings. Several machine learning algorithms and feature extraction algorithms (principal component analysis and linear discriminant analysis) are investigated and analyzed in this paper. Experimental results on a large dataset containing 2484 3-D...
In this paper, we describe a framework for GPS/INS based Portable Positioning System. The framework includes two main components: receiving terminal and monitoring center. In the receiving terminal, the digital compass and the GPS modules are both connected with an I/O interface in a FPGA to provide an integrated positioning solution. This integrated positioning algorithm can solve the problems arising...
A key assumption of traditional machine learning is that both the training and test data share the same distribution. However, this assumption does not hold in many real-world scenarios. For example, in facial expression recognition, the appearance of an expression may vary significantly for different people. Previous work has shown that learning from adequate person-specific data can improve facial...
Nanomaterials exhibit unique properties and have been receiving considerable interest. The dielectric measurement has been performed on gold nanoparticle dispersions by using a THz-Time domain spectroscopy system to investigate the interaction of THz waves with gold nanoparticles.
In this paper, the photoconductivity of silicon is characterized in measurement in two mm-wave bands: 110GHz – 170GHz and 220GHz – 325GHz. It is shown that in the mm-wave bands the silicon has a low loss under dark condition but becomes almost opaque under light illumination.
In this paper, an optically controlled millimeter-wave frequency selective surface using high resistivity silicon as tunable substrate is designed and tested. It is shown from measured results, the transmission performance of FSS at resonant frequency is tuned from −1.02dB to −16dB by light illumination. The photoconductive characteristic of silicon in millimeter wave region is studied. It is shown...
This paper designed and implemented a content-based medical image retrieval (CBMIR) system for mammograms images. The main functions of this system includes query module, feature extraction module, matching module and display module. The system uses the Euclidean distance as an image similarity measure, using the gray level co-occurrence matrix texture and Tamura texture feature extraction. Experiments...
We address the problem of group-level event recognition from videos. The events of interest are defined based on the motion and interaction of members in a group over time. Example events include group formation, dispersion, following, chasing, flanking, and fighting. To recognize these complex group events, we propose a novel approach that learns the group-level scenario context from automatically...
Congealing for an image ensemble is a joint alignment process to rectify images in the spatial domain such that the aligned images are as similar to each other as possible. Fruitful congealing algorithms were applied to various object classes and medical applications. However, relatively little effort has been taken in the direction of compact and effective feature representations for each image....
A novel programmable frequency divider for quantization noise (QN) suppression in fractional- phase-locked loops (PLLs) is presented in this paper. The proposed phase switching multi-modulus frequency divider (PS-MMFD) utilizes a novel glitch-free phase switching (PS) divide-by-0.5/1/1.5/2 cell to reduce the frequency division step to 0.5 and its QN induced by modulation is thus suppressed...
This paper presents a new scheme of digital calibration for a 14-bit 125-MS/s pipelined ADC. The proposed digital calibration corrects the linearity errors resulted from capacitor mismatches, finite Operational Transconductance Amplifier (OTA) gain and OTA's settling error. This calibration method is based on radix-based calibration, and Pseudo-random Noise (PN) sequence is injected into the Multiplying...
Overlap is one of the characteristics of social networks, in which a person may belong to more than one social group. For this reason, discovering overlapping structures is necessary for realistic social analysis. In this paper, we present a novel, general framework to detect and analyze both individual overlapping nodes and entire communities. In this framework, nodes exchange labels according to...
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