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Conference on Information and Knowledge technology

作者： Sadegh Etemad Maryam Amirmazlaghani Dep. of Computer Engineering and Info. Technology Amirkabir University of Technology Tehran Iran

In this study, a new statistical multiplicative watermark detector in contourlet domain is presented. The contourlet coefficients of images are highly non-Gaussian and a proper distribution to model the statistics of the contourlet coefficients is a heavy-tail Probability Distribution Function (PDF). In this study, a multiplicative watermarking scheme is proposed in the contourlet domain using t location-scale distribution (tLS). Afterward, we used the likelihood ratio decision rule and tLS distribution to design an optimal multiplicative watermark detector. The detector showed higher efficiency than other watermarking schemes in the literature, based on the experimental results, and its robustness against different attacks was verified.

关键词： Watermarking Detectors Transforms Additives Airplanes Boats Copyright protection

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Electric energy production in a wind farm - the statistical analysis of measurement results using the time series

Electric energy production in a wind farm - the statistical ...

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Progress in Applied Electrical engineering (PAEE)

作者： Wiesława Malska Damian Mazur Dep. of Power Electronics Rzeszow University of Technology Rzeszow Poland Dep. of Electrical and Computer Engineering Fundamentals Rzeszow University of Technology Rzeszow Poland

The paper presents an analysis of the results of electric energy production in a wind farm. A statistical analysis of the measurement results were performed using the STATISTICA program. The article presents time series on the forecast of electric energy production and actually sold electric energy produced in a wind farm. The analysis was based on data coming from a real wind farm - located in Subcarpathion region.

关键词： Production Wind farms Time series analysis Wind forecasting Renewable energy sources Forecasting Power system stability

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A user's intention detection method for smart walker

A user's intention detection method for smart walker

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International Conference on Awareness Science and technology (iCAST)

作者： Wen-Chang Cheng Yan-Zhi Wu Dep. of Computer Science and Information Engineering Chaoyang University of Technology Taichung Taiwan

To assist home care for the elderly, we've finished a smart walker in previous study, with the features including destination track navigation, obstacle detection, self-positioning, follow-up, and wireless inductive charging. In this study, we further finish the user's intention detection function on the smart walker to control the smart walker. We install 3 pressure sensors on both sides of smart walker handles respectively to extract the user's force application, which are taken as input signal. Through AdaBoost classifier, it finishes input signal recognition and controls of the smart walker moving forward/backward directly. The user doesn't need to press the switch or click on the panel, but apply force on the handle directly, which makes the operation easier. The experiment validates that the accuracy can achieve higher than 98%, which can simplify the operation effectively and achieve the practical purpose.

关键词： Pressure sensors Training Error analysis Senior citizens Force Elevators

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Wavelet transform based technique for text image localization

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Karbala International Journal of Modern Science 2016年第2期2卷 138-144页

作者： Ali, Suhad A. Hashim, Ashwaq T. Babylon University Science College for Women Computer Science Dep. Babylon Iraq Technology University Control and Systems Engineering Dep. Baghdad Iraq

In this paper, a robust technique based on discrete wavelet transform, edge detection, and morphology operation for scene text detection is proposed. There are several stages in the proposed method. In the first stage, a single wavelet decomposition LH, HL and HH subbands are applied for detecting edges in original scene text image. The projection technique is applied in the second stage to preliminary detect text and non-text pixels. In third stage, 4-connected components are applied, and then area geometric feature is used as threshold to remove non-text region. At last stage, morphological operations are applied to connect isolated text components and to remove non-text regions. The proposed method is applied on a various images such as images of low contrast, complex background images and images of different fonts and size of text. The experimental results show that the proposed method can detect regions of the text perfectly. © 2016 The Authors

关键词： Connected components DWT Image projection Morphological operator

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Application of Typical Meteorological Years for Sizing Building Integrated PV Systems under Zero Load Rejections

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Energy Procedia 2017年 105卷 881-887页

作者： K.A. Kavadias D. Zafirakis A.G. Paliatsos Soft Energy Applications and Environmental Protection Laboratory Mechanical Engineering Dep. Piraeus University of Applied Sciences P.O. Box 41046 Athens 12201 Greece Lab of Environmental Technology Electronic Computer Systems Engineering Dep. Piraeus University of Applied Sciences P.O. Box 41046 Athens 12201 Greece

Autonomous photovoltaic systems have already been proved as one of the most reliable ways to handle the electrification requirements of remote consumers in isolated areas. The technology improvement in the field of building integrated photovoltaic systems, along with the governmental financial incentives for boosting the corresponding energy sector, have increased the interest of installing small scale photovoltaic systems not only in remote dwellings but also in grid-connected households. The penetration of photovoltaic systems in densely populated areas has made people even more familiar with them and therefore people with environmental consciousness are more likely to adopt the specific technology. In this context, the present work aims in highlighting the capabilities of building integrated photovoltaic systems along with battery storage devices in covering the electrical needs of a typical dwelling using real electricity demand and meteorological data based on Typical Meteorological Year time series. The system is simulated on an hourly basis by using an integrated numerical code that has been developed by the Soft Energy Applications & Environmental Protection Laboratory of the Mechanical engineering dep.. of Piraeus University of Applied Sciences in Greece. The proposed solution guarantees zero load rejections under different solar potential schemes investigating also the possibilities of minimizing the storage system capacity.

关键词： RES power PV systems BIPV Building integrated photovoltaic systems

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Joining of non-weldable AA7075 and weldable AA6082 aluminium alloy sheets by Friction Stir Welding

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IOP Conference Series: Materials Science and engineering 2018年第1期448卷

作者： Zsolt Kovács Ferenc Hareancz John von Neumann University GAMF Faculty of Engineering and Computer Science Dep. of Vehicle Technology Kecskemét H-6000 Hungary

In this work, an attempt has been made to join the AA6082-T651 and AA7075-T651 aluminium alloys by friction stir welding (FSW). The FSW is a solid-state joining process which primarily used on aluminium because the metal is not melted during the process so the base material can not soften. For the welding were using cylindrical pin tool, marble table to avoid the harmful heat conduction, two rotation rate of 500 and1000 rpm and different traverse speeds of 15, 20, 25 and 30 mm/min to weld butt joints. The aim of present study were to experimentally explore the dissimilar bounds. For evaluations, hardness testing were using to create hardness profiles across the joint in through thickness direction and optical microscope to classify the microstructures and crystallographic textures of base materials (BM). Based on the results obtained it can be stated that the FSW suitable for AA7075 and AA6082 welding by further optimization of the process parameters.

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General Quantized Innovation Kalman Filter for Stochastic Uncertain Systems with Random Packet Dropouts

General Quantized Innovation Kalman Filter for Stochastic Un...

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Youth Academic Conference of Chinese Association of Automation

作者： Huai min Li Qiang Ling School of Computer and Information Engineering Fuyang Normal University Fuyang 236037 China Dep. of Automation University of Science and Technology of China Hefei 230027 China

ISBN: (纸本)9781538629024

Due to of the bandwidth constraint, sensors may only be able to transmit a finite number of bits to save the energy, and the measurement data may have to be quantized before transmission especially in wireless sensor networks (WSNs). This paper studies the problem of the general quantized innovation filtering with random packet dropouts for linear stochastic uncertain systems. The multiplicative uncertainty of system parameters is first converted into additive noises. Then under the Gaussian assumption on the predicted density, the Lloyd-Max quantizer, a general quantized innovation filter with random packet dropouts in the linear minimum mean square error (LMMSE) sense is derived based on the projection theory and Bayes Rule. Furthermore a sufficient condition is provided, under which a general quantized innovation filter with random packet dropouts can be reduced into a standard Kalman filter. An example is simulated to illustrate the effectiveness and correctness of the designed filter.

关键词： General Quantized Innovation Filter Stochastic Uncertain System Packet Dropouts

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Performance characterization of image feature detectors in relation to the scene content utilizing a large image database

arXiv

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arXiv 2017年

作者： Ferrarini, Bruno Ehsan, Shoaib Leonardis, Ales Rehman, Naveed Ur McDonald-Maier, Klaus D. University of Essex School of Computer Science and Electronic Engineering ColchesterCO4 3SQ United Kingdom Dep. of Electrical Engineering COMSATS Institute of Information Technology Islamabad Pakistan School of Computer Science University of Birmingham Birmingham United Kingdom

Selecting the most suitable local invariant feature detector for a particular application has rendered the task of evaluating feature detectors a critical issue in vision research. Although the literature offers a variety of comparison works focusing on performance evaluation of image feature detectors under several types of image transformations, the influence of the scene content on the performance of local feature detectors has received little attention so far. This paper aims to bridge this gap with a new framework for determining the type of scenes which maximize and minimize the performance of detectors in terms of repeatability rate. The results are presented for several state-of-the-art feature detectors that have been obtained using a large image database of 20482 images under JPEG compression, uniform light and blur changes with 539 different scenes captured from real-world scenarios. These results provide new insights into the behavior of feature detectors. Copyright © 2017, The Authors. All rights reserved.

关键词： Feature extraction

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A hybrid localization method for a soccer playing robot

A hybrid localization method for a soccer playing robot

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2016 Artificial Intelligence and Robotics, IRANOPEN 2016

作者： Teimouri, Meisam Salehi, Mostafa E. Meybodi, Mohammad Reza Mechatronics Research Lab Islamic Azad University Qazvin Branch Qazvin Iran Computer Engineering Dep. Amir Kabir University of Technology Tehran Iran

ISBN: (纸本)9781509021697

Self-localization is the process of estimating the robot position exploiting noisy measurements. Since localization is a key issue for soccer playing robots, some probabilistic approaches have been developed over last years to address it. Methods based on Monte Carlo Localization (MCL) show good ability in dealing with kidnap problem, however, most of them are unstable with limited number of samples. On the other hand, Kalman filter extensions are among the best light weight estimators for position tracking. Their drawback is that they are unimodal and can't be used for global and kidnaped problems. Combining the advantages of these two approaches can lead to a valuable method. In this paper we propose a new hybrid localization method that utilizes the MCL and UKF to reach a stable, multimodal, and low weight localization method. The advantages of our method are evaluated in several experiments. © 2016 IEEE.

关键词： Kalman filters

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TEM Characterization of the Edges of CsPb2Br5 Perovskite Crystals

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Microscopy and Microanalysis 2018年第S1期24卷 1984-1985页

作者： Hector A. Calderon Francisco Robles-Hernandez Yanan Wang Chong Wang Xinghua Su Viktor G. Hadjiev Yizhou Ni Md Kamrul Alam Yan Yao Yu Yang Instituto Politecnico Nacional ESFM Depto. Fisica CDMX Mexico 07338 Inst. of Fund. Frontier Scie. U. of Electronic Science and Technology Sichuan610054 China Dep. of Electrical and Computer Engineering University of Houston Houston Texas77204 USA Inst. of Optoel. Inf. Mat. School of Mat. Sci. and Eng. Yunnan University Kunming 650091 China School of Materials Science and Engineering Chang'an University Xi'an Shaanxi710061 China Texas Center for Superconductivity University of Houston Houston TX77204 USA Department of Mechanical Engineering University of Houston Houston TX77204 USA Department of Physics University of Houston Houston Texas77204 USA Materials Science & Engineering University of Houston Houston Texas77204 USA

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