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Automated valuation model (AVM) is a mathematical program to estimate the market value of real estates based on the analysis of locations, neighborhood characteristics, and relevant property characteristics. The most common AVMs em-ployed by the appraisal industry are based on multiple regression analysis. Other analytic tools such as statistical learning and fuzzy algorithms have become more popular...
The deterioration of water mains constitutes a major problem in cities' infrastructure management since the replacement and maintenance of water mains need high financial investments. American Water Works Association estimated the total cost for pipeline system management would be more than $1.7 trillion by 2050. Therefore, it is important to assess performance of water mains to optimize the rehabilitation...
As crowdsourcing has been dramatically investigated and utilized to address problems in the real world, it is essential and important to think about performance optimization. Analogous to computer systems with CPUs, treating each worker as a HPU (Human Processing Unit [1]) and studying the performance optimization on top of HPUs are interesting perspectives to resolve crowdsourcing issues. However,...
Composite materials have been adopted and become critical in aerospace industry. However, due to the fatigue under continuous loading, the uncertain in structural integrity still remains an unsolved problem. The assessment of structural damage in composite laminates can be achieved by damage location, classification, and quantification. The growth trend of delamination area is one of the most important...
This paper presents the experimental results of capacitive imaging sensors for structural integrity assessment. The capacitive sensor is based on the measurement of capacitance change due to the anomaly or discontinuity in structures and materials. A number sensor prototypes are investigated in the study. The observation of the scanned image of a Aluminum plate, a carbon fiber plate, and ductile iron...
Under the ever more complex and dense electromagnetic environment, specific emitter identification (SEI) technique opens up prospects for discriminating and identifying different emitters of the same class. SEI is implemented by employing the unintentional modulation on pulse (UMOP), which is unavoidable and unique to individual emitters. However, the characteristics of UMOP have not been sufficiently...
In this paper, we conduct research on the construction and robustness testing of SaaS cloud computing data center based on the MVC design pattern. The SaaS software needs to experience the strict test before the issue. For all this, because is very difficult to forecast in the future all possible network users' to the service condition of SaaS system, therefore is also hard to conduct the completely...
In this paper, a three-phase 12/8 switched reluctance generator is taken as the study object and a control system based on that generator is designed. In that system, the digital signal controller applied for is dsPIC30F6010, and power converter circuit adopt asymmetric half-bridge topology, and the main switches use power MOSFET. The paper analyzes the process of power generation and the basic structure...
In this work, large crystal atomic layer PtSe2 with a narrow band gap is synthesized by chemical transfer method. We then demonstrated, for the first time, mid-infrared photodetectors based on bilayer PtSe2 with fast response time and high responsivity up to 4.5 A/W under mid-infrared illumination (10 μm) at room temperature.
Ground-based experiment of human locomotion in microgravity needs to partially compensate the influence of the earth gravity. This paper presents a novel design and preliminary experiment of an active suspension gravity compensation system, which can apply a desired constant vertical force at human body for physically simulating human walking in microgravity. The system composed of a passive static...
Human oxygen saturation detection is based on the Lambert-Beer Law, but since the human body is a strong scattering tissue instead of a homogeneous medium, the influence of scattering need to be considered, which means the basic Lambert-Beer Law is not applicable. In this paper, a fiber optic spectrometer is used to detect the blood oxygen saturation in vivo with reflective method. Based on the dynamic...
To identify the out-of-database targets in the process of radar ground target recognition with high resolution range profile, this paper proposes an improved radar ground target classifier based on the covariance distribution of the space of training features, namely Dual-SVDD classifier. In the training phase, a double correlate SVDD structure is constructed in feature space and a multi-region data...
An efficient method for ship detection is proposed, aiming at high-resolution Synthetic Aperture Radar (SAR) images. The signal-to-clutter ratio (SCR) is low due to interferers, including SAR ambiguity, inherent speckle, and wake clutters. Besides, internal weak scatters in target region bring challenge to detect complete ship profiles. A homogenized saliency map is generated for ship detection. The...
Mobile radiation sensor networks integrated with global positioning system coordinates provide an attractive option for the task of dynamically monitoring a region's background radiation and detecting the illicit movement of radioactive materials. Both statistical and probabilistic approaches have been developed for stationary sensor networks to estimate source parameters. In this paper, a pre-filter...
Nowadays synthetic aperture radar (SAR) images offer a great potential in observing and monitoring the maritime environment and many efforts have been devoted on ship detection. Despite of the internal speckle noise and SAR ambiguities, the increased image resolution brings about new challenge for accurate ship detection. Four ship detection schemes are studied and compared in this paper: the CA-CFAR...
The back-projection (BP) algorithm is an ideal solution for airborne synthetic aperture radar (SAR) imaging. However, trajectory deviations degrade BP focusing performance dramatically due to the accuracy limitation of navigation system. In this paper, we propose a novel autofocus method compatible with the BP imagery, which can correct the 3D trajectory deviations. In the new method, multiple local...
This paper considers waveform design for target detection with variations in the target impulse response (TIR). A generalized model of the TIR that consists of both the deterministic term and random term is introduced. Based on the derivation of the generalized likelihood ratio test (GLRT) detector and the optimization function for waveform design, an iterative algorithm with the criteria of maximizing...
Unintentional modulation (UIM), which is unavoidable and unique to individual emitters, can be used to reliably realize emitter identification. Previous identification methods extract features from either some parts of the signal, ignoring the UIM on the other parts, or immediately the whole signal, resulting in heavy computational loads. In this paper, we take the structure of UIM into consideration,...
We explore the third order nonlinear optical conductivity of the bilayer graphene in the terahertz regime where the Rashba spin-orbit coupling interaction is taken into account. It is found that nonlinear optical conductivity of the BLG with ROI is significantly enhanced in comparison with the case without the ROI.
Video-based person re-identification has become a hot topic in the field of research on computer vision and intelligent surveillance, which is more robust to the variations in a person's appearance than single-shot based methods and involves space-time information. However, the most existing spatiotemporal features have been proposed for action recognition that they mainly focus on the exact spatial...
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