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An automatic optical inspection system for the detection of three parallel lines in solar panel end face

OPTIK 2014年第2期125卷 688-693页

作者： Lin, Chern-Sheng Tzeng, Guo-An Cheng, Chi-Tsung Lay, Yun-Long Tien, Chuen-Lin Feng Chia Univ Dept Automat Control Engn Taichung 40724 Taiwan Natl Chin Yi Univ Technol Dept Elect Engn Taipei Taiwan Feng Chia Univ Dept Elect Engn Taichung 40724 Taiwan

This study inspected and tracked the location state of a test object in the telemetry monitoring of a wafer or solar panel, and the relevant optoelectronic devices. A CCD camera, triggered by the proposed system, captures the test target image in real time, which is transferred to the system for low-pass filtering, image binarization, spatial masking, boundary tracing, and other means of image processing. The new edge point detection algorithm is then applied to identify the edge points of three parallel lines. Three different group edge points are determined using the edge point detection algorithm, and the three groups are computed using a single linear regression equation. Multiple-linear regression is conducted to obtain the sections of straight lines of the groups that can best satisfy the expected requirements. Finally, whether the detection results are consistent with the expected requirements is determined to inspect whether the test object is consistent with the process specifications in order to reduce undesirable losses, as caused by inappropriate placement angle in subsequent manufacturing, thus, enhancing subsequent manufacturing to achieve high yield. (C) 2013 Elsevier GmbH. All rights reserved.

关键词： Three parallel lines detection algorithm Multiple-linear regression

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Target detection based on F-test in passive multistatic radar

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DIGITAL SIGNAL PROCESSING 2018年 79卷 1-8页

作者： Zhao, Hong-Yan Zhang, Zi-Jing Liu, Jun Zhou, Shenghua Zheng, Jibin Liu, Weijian Xidian Univ Natl Lab Radar Signal Proc Xian 710071 Shaanxi Peoples R China Taiyuan Univ Technol Coll Informat & Comp Taiyuan 030024 Shanxi Peoples R China Univ Sci & Technol China Dept Elect Engn & Informat Sci Hefei 230027 Anhui Peoples R China Wuhan Elect Informat Inst Wuhan 430019 Hubei Peoples R China

Passive multistatic radar is of great interest in both civilian and military applications due to its numerous advantages. We focus on the target detection problem in passive multistatic radar consisting of a non-cooperative illuminator of opportunity, and several spatially separated surveillance receivers. Two F-test based detectors are proposed for target detection in this passive multistatic radar. They both exhibit a constant false alarm rate with respect to noise power. We drive closed-form expressions for the probability of false alarm of the proposed detector for the case of equal noise power in each receivers. Simulation results illustrate that the proposed detectors achieve satisfactory detection performance without requirement of knowledge about noise power. (C) 2018 Elsevier Inc. All rights reserved.

关键词： Passive multistatic radar F-test detection algorithm Passive detection

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Apoptosis detection via automated algorithms to analyze biomarker translocation in reporter cells

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BIOTECHNOLOGY AND BIOENGINEERING 2020年第5期117卷 1470-1482页

作者： Ahmed, A. H. Rezwanuddin Dereli-Korkut, Zeynep Lee, Joanne Haeun Piracha, Sidra Gilchrist, M. Lane Jiang, Xuejun Wang, Sihong CUNY City Coll Dept Biomed Engn New York NY 10031 USA CUNY City Coll Dept Chem Engn New York NY 10031 USA Mem Sloan Kettering Canc Ctr Cell Biol Program 1275 York Ave New York NY 10021 USA

Rapid, efficient, and robust quantitative analyses of dynamic apoptotic events are essential in a high-throughput screening workflow. Currently used methods have several bottlenecks, specifically, limitations in available fluorophores for downstream assays and misinterpretation of statistical image data analysis. In this study, we developed cytochrome-C (Cyt-C) and caspase-3/-8 reporter cell lines using lung (PC9) and breast (T47D) cancer cells, and characterized them from the response to apoptotic stimuli. In these two reporter cell lines, the spatial fluorescent signal translocation patterns served as reporters of activations of apoptotic events, such as Cyt-C release and caspase-3/-8 activation. We also developed a vision-based, tunable, automated algorithm in MATLAB to implement the robust and accurate analysis of signal translocation in single or multiple cells. Construction of the reporter cell lines allows live monitoring of apoptotic events without the need for any other dyes or fixatives. Our algorithmic implementation forgoes the use of simple image statistics for more robust analytics. Our optimized algorithm can achieve a precision greater than 90% and a sensitivity higher than 85%. Combining our automated algorithm with reporter cells bearing a single-color dye/fluorophore, we expect our approach to become an integral component in the high-throughput drug screening workflow.

关键词： biomarker translocation caspase-3 caspase-8 cytochrome-C detection algorithm reporter cells

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Automatic detection of abnormal torque while reaming

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JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING 2018年 166卷 13-24页

作者： Hovda, Sigve Norwegian Univ Sci & Technol Dept Geosci & Petr SP Andersens Veg 15a Trondheim Norway

A lumped element model is implemented to describe the torsional vibrations of the drillstring while reaming, i.e. rotating off-bottom. The rotary motions and the torques anywhere in the drillstring are simply convolutions of the surface rotary motion with analytical expressions that are derived in this paper. The Coulomb friction forces are divided into steady-state forces and time-dependent forces. The drillstring vibrates around a stable position that is determined by the steady-state friction torques. The vibrations are damped by viscous friction forces and in particular the Basset forces dominate the damping. The time-dependent part of the Coulomb friction forces are related to when something is not normal in the well. For instance, when the drill bit is hindered by a cuttings bed or the bottom part of the drillstring is hung up in a sharp curvature. The model is further used in an algorithm for detecting the time-dependent Coulomb friction coefficients. A sensitivity study is added and the detection algorithm seems to be mathematically robust. This motivates experimental verifications of both the model and the detection algorithm in the future.

关键词： Drillstring dynamics Torsional vibration Couette Poiseuille flow detection algorithm

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Residual Current detection Prototype and Simulation Method in Low Voltage DC System

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IEEE ACCESS 2022年 10卷 51100-51109页

作者： Cheng, Da Zhang, Baoliang Xiong, Suqin Xie, Zhimin Xue, Zhongzheng China Elect Power Res Inst Co Ltd Beijing 100912 Peoples R China Xi An Jiao Tong Univ State Key Lab Elect Insulat & Power Equipment Xian 710049 Shaanxi Peoples R China

With the rapid development of the DC system, the residual current in the DC system has become an urgent problem to be solved. However, the type B residual current devices (RCD) for AC systems could not be directly used in DC systems. In the DC system, the voltage fluctuation generated by the rectifier and the system circulating net currents generated by the line with different positive and negative parameters would interfere with RCD detection. In this paper, the residual current experimental platform was built first. Then the residual current detection prototype was developed and its operating characteristics were tested. The impedance model of the human body was built for different electric shock conditions secondly. Thirdly, the influence of system factors on circulating net currents and residual current detection was analyzed. Finally, the configurations of RCD in the DC system were proposed, protecting the human body from electric shock and preventing electric fire accident threats.

关键词： Electric shock Load modeling Switches Prototypes Magnetic cores Electromagnetics Magnetic hysteresis DC residual current LVDC detection algorithm magnetic modulation model simulation

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detection of fiducial gold markers for automatic on-line megavoltage position verification using a marker extraction kernel (MEK)

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INTERNATIONAL JOURNAL OF RADIATION ONCOLOGY BIOLOGY PHYSICS 2000年第5期47卷 1435-1442页

作者： Nederveen, A Lagendijk, J Hofman, P Univ Utrecht Med Ctr Dept Radiat Oncol NL-3584 CX Utrecht Netherlands

Purpose: In this study automatic detection of implanted gold markers in megavoltage portal images for on-line position verification was investigated, Methods and Materials: A detection method for fiducial gold markers, consisting of a marker extraction kernel (MEK), was developed. The detection success rate was determined for different markers using this MEK. The localization accuracy was investigated by measuring distances between markers, which were fixed on a perspex template. In order to generate images comparable to images of patients with implanted markers, this template was placed on the skin of patients before the start of the treatment, Portal images were taken of lateral prostate fields at 18 MV within 1-2 monitor units (MU). Results: The detection success rates for markers of 5 mm length and 1.2 and 1.4 mm diameter were 0.95 and 0.99 respectively when placed at the beam entry and 0.39 and 0.86 when placed at the beam exit. The localization accuracy appears to be better than 0.6 mm for all markers. Conclusion: Automatic marker detection with an acceptable accuracy at the start of a radiotherapy fraction is feasible, Further minimization of marker diameters may be achieved with the help of an a-Si flat panel imager and may increase the clinical acceptance of this technique. (C) 2000 Elsevier Science Inc.

关键词： portal imaging gold markers position verification detection algorithm

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Zero Cross detection Using Phase Locked Loop

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IFAC-PapersOnLine 2016年第25期49卷 294-298页

作者： Stastny, Ladislav Mego, Roman Franek, Lesek Bradac, Zdenek Department of Control and Instrumentation Brno University of Technology Brno Czech Republic Department of Radio Electronics Brno University of Technology Brno Czech Republic

This paper discusses zero cross detection method for the time synchronization purpose that is based on phase locked loop. After familiarizing with PLL concept and its blocks, example design of the PLL is realized. Simulation schema is introduced to examine and analyse PLL behaviour under different grid interferences. Performed tests show two potential issues multiple zero crossing in the zero cross area may cause instability of the loop and the presence of harmonics may cause shifts of the zero cross event. © 2016

关键词： Phase locked loops Locks (fasteners) detection algorithm detection methods grid interferences Time synchronization Zero crossings

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Technique for target detection and ranging based on broadband LPI radars

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ELECTRONICS LETTERS 2001年第12期37卷 784-786页

作者： Pérez-Martínez, F García-Fominaya, J Burgos-García, M ETSI Telecomunicac Madrid 28040 Spain

A processing technique for improving the ranging and detection capabilities of LPI radars and the measured performance of an experimental system are presented. The precision of the measured distance is very high even ... 详细信息

关键词： Military radar, detection and tracking systems broadband LPI radars detection algorithm electronic warfare Electronic warfare noisy environments Radar theory target detection low SNR conditions detection capabilities Radar equipment, systems and applications target tracking FM radar radar detection

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detection of Generalized Space Shift Keying Signal With Sparse Reconstruction

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IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY 2017年第6期66卷 5473-5477页

作者： Zhang, Xinhe Liu, Qian Jin, Minglu Dalian Univ Technol Sch Informat & Commun Engn Dalian 116024 Peoples R China Univ Sci & Technol Liaoning Sch Elect & Informat Engn Anshan 114051 Peoples R China Dalian Univ Technol Sch Comp Sci & Technol Dalian 116024 Peoples R China

In this paper, we propose a novel generalized space shift keying (GSSK) detection algorithm by exploiting the inherent sparse property of GSSK signal. In particular, we formulate the GSSK detection into a sparse convex optimization problem. The key contribution of the proposed algorithm lies in the strategical adoption and transformation of the sparse reconstruction (SR) from image processing to GSSK detection. The proposed SR detector achieves better performance than all existing suboptimal solutions with comparable computational complexity. In order to further improve the performance of the SR algorithm, we develop another approach, i.e., the iterative SR algorithm, which utilizes the result of the SR algorithm as the start point and enhances the detection performance gradually in each iteration. The simulation results confirm the efficiency of both of the proposed algorithms.

关键词： Computational complexity detection algorithm generalized space shift keying (GSSK) maximum likelihood detection sparse reconstruction (SR)

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Wireless Falling detection System Based on Community

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JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY 2015年第6期15卷 4367-4372页

作者： Xia, Yun Wu, Yanqi Zhang, Bobo Li, Zhiyang He, Nongyue Li, Song Southeast Univ State Key Lab Bioelect Nanjing 210096 Jiangsu Peoples R China Hunan Univ Technol Hunan Key Lab Green Packaging & Applicat Biol Nan Zhuzhou 412007 Peoples R China

The elderly are more likely to suffer the aches or pains from the accidental falls, and both the physiology and psychology of patients would subject to a long-term disturbance, especially when the emergency treatment was not given timely and properly. Although many methods and devices have been developed creatively and shown their efficiency in experiments, few of them are suitable for commercial applications routinely. Here, we design a wearable falling detector as a mobile terminal, and utilize the wireless technology to transfer and monitor the activity data of the host in a relatively small community. With the help of the accelerometer sensor and the Google Mapping service, information of the location and the activity data will be send to the remote server for the downstream processing. The experimental result has shown that SA (Sum-vector of all axes) value of 2.5 g is the threshold value to distinguish the falling from other activities. A three-stage detection algorithm was adopted to increase the accuracy of the real alarm, and the accuracy rate of our system was more than 95%. With the further improvement, the falling detecting device which is low-cost, accurate and user-friendly would become more and more common in everyday life.

关键词： Wearable Falling Detector Community detection algorithm Google Mapping Service

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