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检索条件"主题词=Correction algorithm"

共 139 条记录，以下是131-140 订阅

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Optimization of Complex Shape Part Inspections with Phased Arrays

Optimization of Complex Shape Part Inspections with Phased A...

引用

IEEE International Ultrasonics Symposium

作者： Marco A. B. Andrade Julio C. Adamowski Alberto Ibanez Montserrat Parrilla Carlos Fritsch Department of Mechatronics Engineering Escola Politecnica da Universidade de Sao Paulo Instituto de Automatica Industrial Consejo Superior de Investigaciones Cientificas (CSIC)

ISBN: (纸本)9781424443895;9781424443901

The non-destructive testing of complex shape parts is usually performed in immersion. In state of the art phased array equipments an image consists of a set of scan lines where dynamic depth focusing is performed in reception. To achieve the highest resolution and sensitivity, the scan lines should coincide with the path of maximum acoustic field intensity of the emitted beam. In complex part inspections, it is common that the path defined by the maximum field does not coincide with the scan lines. In order to increase the image resolution and sensitivity, this paper presents a correction algorithm to determine the locus of the foci that coincide with the maximum field intensity of the emitted beam. The proposed method was verified by comparing the images obtained with the classical approach and with that obtained by using the correction algorithm. The image comparison shows that the proposed method improves the image sensitivity and resolution.

关键词： Focal law computing Field simulation Arbitrary interface NDE field simulation phased array correction algorithm Nondestructive Testing scan line NDE1 gene image resolution state of the art images Imagery (Psychotherapy) scanning

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Non-invasive glucose monitoring from measured inputs

Non-invasive glucose monitoring from measured inputs

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UKACC International Conference on Control 2010

作者： Derrick K. Rollins Kaylee Kotz Cory Stiehl Department of chemical and Biological Engineering Department of Statistics Iowa State University Ames IA USA Department of chemical and Biological Engineering Iowa State University Ames IA USA

ISBN: (纸本)9781627481199

In recent years, there has been tremendous progress in the technological advancement of continuous-time glucose devices. However, even the most successful devices are at least semi-invasive, requiring subcutaneous insertion of a sensor, that affects patient comfort in addition to reoccurring costs for sensor placement. The objective of this work is the development of a continuous-time glucose modeling system that infers glucose levels from non-invasive measured inputs of activity, stress, and food components. The method appears to have excellent long term stability and the correction algorithm for using measured glucose is quite promising.

关键词： Block-oriented modeling Wiener systems Nonlinear dynamic modeling Continuous glucose monitoring long-term stability correction algorithm glucose monitoring Technological Advancement sensor placement Blood Glucose Glucose Sensors Patient Comfort

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TUNING THE NARROW-BAND BEAM POSITION MONITOR SAMPLING CLOCK TO REMOVE THE ALIASING ERRORS IN APS STORAGE RING ORBIT MEASUREMENTS

TUNING THE NARROW-BAND BEAM POSITION MONITOR SAMPLING CLOCK ...

引用

2007 IEEE Particle Accelerator Conference (PAC 2007), vol.1

作者： X. Sun O. Singh ANL Argonne IL 60439 U.S.A.

ISBN: (纸本)9781424409167;1424409160;1424409179

The Advanced Photon Source storage ring employs a real-time orbit correction system to reduce orbit motion up to 50Hz. This system uses up to 142 narrow-band rf beam position monitors (Nbbpms) in a correction algorithm by sampling at a frequency of 1.53kHz. Several Nbbpms exhibit aliasing errors in orbit measurements, rendering these Nbbpms unusable in real-time orbit feedback. The aliasing errors are caused by beating effects of the internal sampling clocks with various other processing clocks residing within the BPM electronics. A programmable external clock has been employed to move the aliasing errors out of the active frequency band of the real-time feedback system (RTFB) and rms beam motion calculation. This paper discusses the process of tuning and provides test results.

关键词： correction algorithm tuning Eye Sockets Orbits Timing devices in orbit measurement BPM MONITOR Frequency bands Aliasing Sampling

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Towards Autonomous Robot Machining

Towards Autonomous Robot Machining

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ISR/Robotik 2014;41st International Symposium on Robotics

作者： Frank Domroes Michael Rieger Bernd Kuhlenkoetter TU Dortmund University

This paper presents the design of a robotic machining system, developed to face the requirement of high flexibility in milling and deburring operations in small batch production. By using a flexibile programming concept, based on robot force control and changing feed speed, we allow autonomous adaption of paths along the workpiece contour and process a milling operation accordingly. We take into account that gripped parts might be misaligned and present a correction algorithm from laser distance measurements.

关键词： workpiece contour batch production correction algorithm Autonomous robots milling Machine Systems machining milling operation deburring feed speed Force control

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Research on the Profits Distribution of the Supply Chain using Shapely Value method

Research on the Profits Distribution of the Supply Chain usi...

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第17届工业工程与工程管理国际学术会议(IE&EM2010)

作者： Ju-hong GAO~1 Yan-fei SHI~2 1,2 School of Management and Economic,Tianjin University,P.R.China

In this paper,shapely value method is used to solve the problem of benefits distribution of the supply chain as a virtual dynamic alliance,and through a correction algorithm with an example,the risks values and interests shared by the enterprises in the supply chain is analyzed based on the acceptable satisfaction degree analysis, providing a reasonable feasibility strategy allocation of the interests.

关键词： supply chain benefits distribution shapely value method correction algorithm satisfaction degree analysis

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Analysis of Sampling Error in FTIR

Analysis of Sampling Error in FTIR

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The 2013 3rd International Conference on Photonics and Image in Agriculture Engineering (PIAGENG 2013)

作者： Ya Kang Dep.of Engi.Management Chongqing City Management College

ISBN: (纸本)9780819495587

In Fourier transform infrared spectrometer(FTIR), the optical path difference of laser metrology is applied to increase spectrum measure precision. However, due to the characteristics of laser single frequency and steady frequency, the uneven speed of moving mirror, circuit delay etc. cause the deviation of sampling point. In this paper, based on the interference theory of spectrometer, according to the Fourier contrary transform and methods of error analysis, the theory model between relative error of spectrum measure and the deviation of sampling point is established. Some simulation computations of the model have been done, the result indicates that, as a theory basis, the model can be applied in analyzing the sampling error of spectrometer and correction algorithm.

关键词： infrared technology spectrum measure Fourier contrary transform sampling error correction algorithm

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Deep Learning Models for PET Scatter Estimations

Deep Learning Models for PET Scatter Estimations

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IEEE Nuclear Science Symposium

作者： Hua Qian Xue Rui Sangtae Ahn GE Global Research

ISBN: (纸本)9781538622834

Projection data acquired from a positron emission tomography (PET) scanner consist of true, scattered and random events. Scattered events can cause severe artifacts and quantitation errors in reconstructed PET images unless corrected for properly. A scatter correction algorithm is required to predict scattered events from the measurement. Scatter correction requires estimation of both single scatter and multiple scatter profiles. Usually, single scatter profiles are calculated by model-based simulation and multiple scatter profiles are estimated by a kernel-based convolution method. However, design of the convolution kernels for multiple scatter estimation is sophisticated and requires fine parameter tuning. In this work, we adopt deep learning techniques for scatter estimation. We propose two convolutional neural networks. The first network estimates multiple scatter profiles from single scatter profiles, replacing the kernel-based convolution method. The second network is designed to predict the total scatter profiles (including single and multiple scatters) directly from the input of emission and attenuation sinograms. Initial results from both networks show a promise with the potential for more accurate and faster scatter correction for PET.

关键词： Scattering PET Scan MULTIPLE SCATTERING Polyethylene Terephthalates correction algorithm single scattering Convolution

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一种红外焦平面非均匀性特征分解的校正算法

一种红外焦平面非均匀性特征分解的校正算法

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第四届全国信息光学与光子器件学术会议

作者：贺明王亚弟王新赛路建方刘雨朱玉娜防空兵学院红外与成像制导技术实验室河南郑州450052 解放军信息工程大学电子技术学院河南郑州450052 防空兵学院红外与成像制导技术实验室河南郑州450052 解放军信息工程大学电子技术学院河南郑州450052

针对目前传统的红外焦平面自适应场景校正算法适用性的局限，本文创新的提出了一种基于红外焦平面非均匀性特征分解的场景校正算法，分析红外焦平面非性匀性构成因素，把红外焦平面非均匀性分解成盲点、行列非均匀性、梯度非均匀性等特... 详细信息

针对目前传统的红外焦平面自适应场景校正算法适用性的局限，本文创新的提出了一种基于红外焦平面非均匀性特征分解的场景校正算法，分析红外焦平面非性匀性构成因素，把红外焦平面非均匀性分解成盲点、行列非均匀性、梯度非均匀性等特征，然后对各类非均匀性采用不同的处理算法，最后合并完成校正。利用该算法在自主研发的热像仪中验证。实验表明，该算法校正精度高，适用性强，能有效克服了传统场景校正出现＇鬼影＇等图像退化现象，并且计算简单，满足实时性要求。

关键词： Infrared focal plane arrays nonunifority image decomposition correction algorithm

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A Consideration of Interference Prevention Technique for Doppler Weather Radars

A Consideration of Interference Prevention Technique for Dop...

引用

International Symposium on Antennas and Propagation

作者： Atsumu Hattori Nobuyoshi Kikuma Hiroshi Hirayama Kunio Sakakibara Department of Computer Science and Engineering Nagoya Institute of Technology Gokiso-cho Showa-ku Nagoya 466-8555 Japan

ISBN: (纸本)9781467310017

Doppler weather radar is a type of radar used to locate precipitation, calculate its motion, and estimate its type (rain, snow, hail, etc.). Modern weather radars are mostly pulse-Doppler radars, capable of detecting the motion of rain droplets in addition to the intensity of the precipitation. Data obtained from weather radars can be analyzed to determine the structure of storms and their potential to cause severe weather s uch as local short-term rainfall. In recent years, the installation places of the Doppler weather radars are increased in order to predict more exactly the local short-term rainfall. However, Doppler weather radars which are installed closely cause interference to each other. As a result, the correct meteorological data are no longer obtained from the radars. From now on, the number of the radars will increase because of more localization of short-term rainfall. Therefore, the evaluation of conventional interference prevention techniques and improvement of the techniques are indispensable for stable and reliable operation of the radars. In this paper, clarifying the characteristics of the conventional interference detection and correction algorithm in Doppler weather radars, we propose a novel algorithm and show through computer simulation that it is more effective than the conventional one.

关键词： radar Doppler weather radar rain interference detection correction algorithm

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