检索结果-内蒙古大学图书馆

2nd International Conference on Advanced Materials and its Application (AMA 2013)

作者： Lu, Hua Yang, Fan Jin, Hongyu Han, Zhenyu Harbin Inst Technol Sch Mechatron Engn Harbin 150001 Peoples R China

ISBN: (纸本)9783037857878

Automated fiber placement (AFP) is a recent development of composite manufacturing technology and is widely used in the field of aerospace. The post processing of AFP has an important influence to the stability of machine movement and the manufacturing accuracy. This paper presents a post processing algorithm of a kind of 7-DOF gantry-type automated fiber placement equipment. The linking coordinates are set up according to the structure of the machine. To solve the redundant degree problem, pose separation method is adopted to calculate the inverse kinematics of the spindle rotation DOF and the other six movement DOFs of the manipulator respectively. Finally, reasonable parameters of each motion of the machine are obtained by the proposed post-processing method.

关键词： post-processing algorithm automated fiber placement machine inverse kinematics

来源：评论

学校读者我要写书评

暂无评论

Kinematic Analysis and post-processing algorithm Research for 5-Axis CNC Machine Tools with a Universal Head

Kinematic Analysis and Post-Processing Algorithm Research fo...

引用

IEEE International Conference on Industrial Engineering and Engineering Management (IEEM 2009)

作者： Xie, C. Zhang, W. M. He, X. Y. Tongji Univ Coll Mech Engn Shanghai 200092 Peoples R China Sheyang Machine Tool Grp Co LTD Design & Res Inst Shenyang Peoples R China

ISBN: (纸本)9781424448692

Improving the accuracy of 5-axis CNC machine tools is a problem for professional people to solve all the time. Its kinematic configuration and numerical control algorithm are crucial factors affecting errors. All the possible structural configurations of 5-axis CNC machine tools with a universal head were shown in this study. The optimal kinematic chain was presented from the view of kinematic errors and workpiece degrees of freedom (DOF). The general calculating formulation of tool center point (TCP) deduced by analyzed the special movement of 5-axis CNC machine tools with a universal head. It is pointed out that the tool axis orientation (TAO) only depends on rotational movements instead of translational ones. The post-processing algorithm of CAM programs was solved out through compound transmission matrix. It was concluded that TCP coordinate value, tool axis orientation and post-processing algorithm can not be changed with the sequence change of movement axes for 5-axis CNC machine tools with a universal head

关键词： Kinematic analysis post-processing algorithm 5-axis CNC machine tools with a universal head Kinematic errors

来源：评论

学校读者我要写书评

暂无评论

Development and Characterization of a Lateral Localization post-processing algorithm Using Multiple Receive Apodizations

Development and Characterization of a Lateral Localization P...

引用

作者： Yunis, Omar Tariq The University of Memphis

学位级别：M.S., Master of Science/Master of Surgery

Ultrasound localization microscopy (ULM) is a super-resolution vascular imaging technique that tracks the position of individual circulating microbubbles over time. Conventional ULM methods fit a gaussian distribution to a coarsely-pixelated brightness image of a microbubble, and assume the microbubble's position is the mean. In this work, we developed alternative algorithms to precisely and accurately estimate the location of a microbubble by considering multiple even and odd receive apodization profiles applied to channel RF data. These receive apodization profiles each yield a point spread function with a unique lateral character, enabling intra-beam determination of a scatterer's location. algorithms were refined and evaluated first for the case of focused-beam transmits over a range of F-numbers, and also for the case of ultrafast, multi-angle plane-wave compounding. The performance of the algorithms was experimentally evaluated on a research ultrasound scanner using a P4-2v phased array probe and a custom wire-target phantom. Results show that the position of the scatterer was resolvable to less than one-fourth of the diffraction limited resolution.

关键词： Lateral localization post-processing algorithm Multiple receive apodization

来源：评论

学校读者我要写书评

暂无评论

Development of a novel flexible printed circuit sensor and post-processing algorithm for two-phase flow measurement in narrow rectangular channels

引用

EXPERIMENTAL THERMAL AND FLUID SCIENCE 2022年 136卷 1页

作者： Yang, Yiang Xiong, Jinbiao Shanghai Jiao Tong Univ Sch Nucl Sci & Engn Shanghai Peoples R China

Experimental measurement of two-phase flow in narrow rectangular channels is of great interest for various industrial applications. As it is almost prohibitive to apply the conventional two-phase flow measurement technology in narrow rectangular channels, the novel flexible printed circuit (FPC) sensor has been developed based on the wire-mesh sensor system. The FPC sensor avoids the stretching device which significantly disturbs the flow and achieves the spatial resolution of 1.35 mm and the sampling rate up to 3150 Hz in a narrow channel. The dedicated post-processing algorithms, including that for noise elimination, resolution refinement, interface sharpening and parameter derivation, were developed for bubbly and slug flows. The reliability of the FPC sensor and the accuracy of post-processing algorithms are assessed based on comparison with high-speed camera images. According to the validation, for bubbly flow with the bubble diameter larger than 4 mm, the bubble diameter can be underestimated by 5.2% with the relative standard deviation below 7.8%. When recommended criterion is followed in postprocessing, the bubble velocity is underestimated by 2.0% with the relative standard deviation below 3.74%. For slug flow, Taylor bubble velocity and length can be underestimated by 1.03% and 2.22% with the relative standard deviation of 5.37% and 7.11%.

关键词： Narrow rectangular channel Two-phase flow instrumentation Non-intrusive measurement Void fraction post-processing algorithm

来源：评论

学校读者我要写书评

暂无评论

Characterization of kilovoltage x-ray image guidance system with a novel post-processing algorithm on a new slip ring-mounted radiotherapy system

引用

JOURNAL OF APPLIED CLINICAL MEDICAL PHYSICS 2024年第12期25卷 e14524页

作者： Zhu, Heling Dong, Tingting Pang, Tingtian Guan, Qiu Yang, Jingru Zhao, Feini Yang, Bo Qiu, Jie Chinese Acad Med Sci & Peking Union Med Coll Peking Union Med Coll Hosp Dept Radiat Oncol Beijing Peoples R China Our United Corp Xian Shanxi Peoples R China

Purpose: This study evaluates the performance of a kilovoltage x-ray image-guidance system equipped with a novel post-processing optimization algorithm on the newly introduced TAICHI linear accelerator (Linac). Methods: A comparative study involving image quality tests and radiation dose measurements was conducted across six scanning protocols of the kV-cone beam computed tomography (CBCT) system on the TAICHI Linac. The performance assessment utilized the conventional Feldkamp-Davis-Kress (FDK)algorithm and a novel Non-Local Means denoising and adaptive scattering correction (NLM-ASC) algorithm. Image quality metrics, including spatial resolution, contrast-to-noise ratio (CNR), and signal-to-noise ratio (SNR), were evaluated using a Catphan 604 phantom. Radiation doses for low-dose and standard protocols were measured using a computed tomography dose index (CTDI)phantom, with comparative measurements from the Halcyon Linac's iterative CBCT (iCBCT). Results: The NLM-ASC algorithm significantly improved image quality, achieving a 300%-1000% increase in CNR and SNR over the FDK-only images and it also showed a 100%-200% improvement over the iCBCT images from Halcyon's head protocol. The optimized low-dose protocols yielded higher image quality than the standard FDK protocols, indicating potential for reduced radiation exposure. Clinical implementation confirmed the TAICHI system's utility for precise and adaptive radiotherapy. Conclusion: The kV-IGRT system on the TAICHI Linac, with its novel post-processing algorithm, demonstrated superior image quality suitable for routine clinical use, effectively reducing image noise without compromising other quality metrics.

关键词： kV-CBCT post-processing algorithm slip ring-mounted Linac

来源：评论

学校读者我要写书评

暂无评论

Quantitative measure and visualization for local shock strength in two-dimensional flow

引用

ACTA MECHANICA SINICA 2025年第5期41卷 1-14页

作者： Li, Jiashuo Shi, Aiming Dowell, Earl H. Peking Univ Coll Engn Ctr Appl Phys & Technol Beijing 100871 Peoples R China Northwestern Polytech Univ Sch Aeronaut NPU Duke Aerodynam & Aeroelast Xian 710072 Peoples R China Natl Key Lab Aircraft Configurat Design Xian 710072 Peoples R China Duke Univ Dept Mech Engn & Mat Sci NPU Duke Aerodynam & Aeroelast Durham NC 27708 USA

The concept of local shock strength and a quantitative measure index str of local shock strength are proposed, derived from the oblique shock relation and the monotonic relationship between total pressure loss ratio and normal Mach number. Utilizing the high density gradient characteristic of shock waves and the oblique shock relation, a post-processing algorithm for two-dimensional flow field data is developed. The objective of the post-processing algorithm is to obtain specific shock wave location coordinates and calculate the corresponding str from flow filed data under the calibration of the oblique shock relation. Validation of this post-processing algorithm is conducted using a standard model example that can be solved analytically. Combining the concept of local shock strength with the post-processing algorithm, a local shock strength quantitative mapping approach is established for the first time. This approach enables a quantitative measure and visualization of local shock strength at distinct locations, represented by color mapping on the shock structures. The approach can be applied to post-processing numerical simulation data of two-dimensional flows. Applications to the intersection of two left-running oblique shock waves (straight shock waves), the bow shock in front of a cylinder (curved shock wave), and Mach reflection (mixed straight and curved shock waves) demonstrate the accuracy, and effectiveness of the mapping approach in investigating diverse shock wave phenomena. The quantitative mapping approach of str may be a valuable tool in the design of supersonic/hypersonic vehicles and the exploration of shock wave evolution.

关键词： Shock wave Local shock strength Quantitative measure index post-processing algorithm Quantitative mapping

来源：评论

学校读者我要写书评

暂无评论

Enhanced mask R-CNN for luminaire detection through brightness balancing and distribution-guided optimization in tunnels

引用

INTERNATIONAL JOURNAL OF DIGITAL EARTH 2025年第1期18卷

作者： Qin, Xiaoqiong Xu, Bintao Wang, Chenchen Liu, Lirui Xie, Linfu Liu, Rong Hu, Mingwei Chen, Xiangsheng Shenzhen Univ State Key Lab Intelligent Geotech & Tunnelling Shenzhen Peoples R China Minist Emergency Management Shenzhen Technol Inst Urban Publ Safety Shenzhen Peoples R China Minist Emergency Management Key Lab Urban Safety Risk Monitoring & Early Warni Shenzhen Peoples R China Guangdong Hualu Transport Technol Co Ltd Guangzhou Peoples R China Guangdong Prov Key Lab Tunnel Safety & Emergency S Guangzhou Peoples R China Shenzhen Univ State Key Lab Subtrop Bldg & Urban Sci Shenzhen 518060 Peoples R China Shenzhen Univ Res Inst Smart Cities Sch Architecture & Urban Planning Shenzhen 518060 Peoples R China Sun Yat Sen Univ Sch Geog & Planning Guangzhou Peoples R China

Luminaire detection methods based on deep learning encounter challenges in tunnel luminaire detection due to the complex environment and unfavorable lighting conditions. To overcome these issues, this paper proposes an improved tunnel luminaire detection solution by enhancing the Mask R-CNN using brightness balancing and distribution-guided optimization. Leveraging tunnel gray-scale images and the Mask R-CNN object detection framework, a feature fusion network based on ResNet-FPN, trained via transfer learning, which enhances performance in detecting object luminaires. Furthermore, considering the differences in luminaire brightness, their backgrounds, and regular spacing, an object brightness enhancement method based on a fixed threshold and an innovative distribution-guided optimization strategy are introduced to effectively reducing missed detections and false alarms while accurately correcting the detected luminaire positions. To evaluate the performance of the proposed approach, real datasets of tunnel environment are used. Experimental results revealed that the proposed approach achieved precision, recall, and an F1-score of 98.3%, 98.5%, and 0.984, respectively, which improved of 0.5%, 5.1%, and 0.029, respectively, compared to the original model, thus, could be applied to the 3D model construction and intelligent management of tunnels. The code implementing our method is available at https://***/xubintao/OBE-and-DGO.

关键词： Mask R-CNN object detection tunnel luminaires object brightness enhancement post-processing algorithm

来源：评论

学校读者我要写书评

暂无评论

Tensor multi-subspace learning for robust tensor-based multi-view clustering

引用

KNOWLEDGE-BASED SYSTEMS 2025年 318卷

作者： Cai, Bing Lu, Gui-Fu Ji, Guangyan Du, Yangfan Anhui Inst Informat Technol Sch Comp & Software Engn Wuhu 241000 Peoples R China Nanjing Univ Sci & Technol Sch Comp Sci & Engn Nanjing 210094 Peoples R China Anhui Polytech Univ Sch Comp & Informat Wuhu 241000 Peoples R China

Tensor-based multi-view clustering (TMVC) has garnered considerable attention for its efficacy in managing data that originate from multiple perspectives. However, the presence of noise in empirical datasets often undermines the reliability and robustness of the affinity matrices generated through these methods. To address this challenge, we introduce an innovative approach termed tensor multi-subspace learning (TMSL). Our methodology commences with the employment of a typical TMVC method to produce self-representation matrices for each view. Nevertheless, the affinity matrix derived from these self-representation matrices frequently falls short of the desired levels of dependability and robustness. To uncover the intrinsic architecture of the data within the tensor subspace, we harness the concept of tensor low-rank representation. This enables us to extract a higher-dimensional representation of multi-view data, thereby yielding a multi-subspace representation tensor that is both reliable and robust. These two stages are then seamlessly integrated into a unified framework and are resolved by employing the augmented Lagrangian algorithm. Notably, the TMSL method also serves as an effective post-processing strategy capable of being applied to various TMVC methods to augment their performance. Empirical evidence has established that TMSL outperforms other contemporary methods, and the post-processing strategy has proven to be an effective unified approach that can be extended to other TMVC methods.

关键词： Multi-view clustering post-processing algorithm Tensor low-rank representation

来源：评论

学校读者我要写书评

暂无评论

Implementing a growth pattern of climax community as post-processing filters core to improve tree species classification accuracy

引用

INTERNATIONAL JOURNAL OF DIGITAL EARTH 2025年第1期18卷

作者： Zhang, Biao Dong, Liguo Wang, Zhichao Feng, Zebang Shao, Yakui Ma, Tiantian Chen, Xuanchi Li, Hao Wang, Bin Feng, Zhongke Beijing Forestry Univ Precis Forestry Key Lab Beijing Beijing 100083 Peoples R China Hainan Univ Hainan Peoples R China Ningxia Acad Agr & Forestry Ningxia Peoples R China NavInfo Co Ltd Beijing Peoples R China Zhengzhou Univ Zhengzhou Peoples R China Tianjin Beidagang Wetland Nat Reserve Management C Tianjin Peoples R China

Improving tree species classification accuracy often involves complex workflows, constrained by high computational costs, extensive data requirements, and sensitivity to spatiotemporal variations. This study introduces the Change Resistance Filter (CR-Filter), inspired by the stable growth patterns of the Climax Community. The CR-Filter, applied as a post-processing tool, integrates Change Resistance on Timelines and Change Resistance on Spatial Neighboring into a unified framework, enhancing classification precision by mitigating spatiotemporal fluctuations. Liupan Mountain Nature Reserve was selected as the study area for its ecological stability. Multi-temporal Sentinel-2 data spanning several years were used to extract and correct phenological indices, which were combined with Sentinel-1 and terrain data to generate interannual tree species classification maps. These maps were subsequently refined using the CR-Filter. Compared to traditional methods, robustness in highly heterogeneous regions was improved by leveraging interannual map integration, yielding species distribution maps with greater spatial consistency and temporal stability. Overall accuracy increased by 8.44%, from 85.85% to 93.10%, effectively reducing misclassification from noise or transient changes. This approach highlights the CR-Filter's efficacy with limited samples and medium-to-low resolution, providing strong technical support for remote sensing-based species mapping and ecological research.

关键词： Tree species classification filter sentinel-2 post-processing algorithm timelines and spatial neighboring

来源：评论

学校读者我要写书评

暂无评论

A New Secure and Efficient Approach for TRNG and Its post-processing algorithms

引用

JOURNAL OF CIRCUITS SYSTEMS AND COMPUTERS 2020年第15期29卷

作者： Yakut, Selman Tuncer, Taner Ozer, Ahmet Bedri Malatya Turgut Ozal Univ Comp Engn Dept Malatya Turkey

Random numbers are important parameters for the security of cryptographic applications. In this study, a secure and efficient generator is proposed to generate random numbers. The first part of the generator is a true random number generator that consists of chaotic systems implemented on FPGA. The second part of the generator is a post-processing algorithm used to overcome the problems that emerge from the generator or environmental factors. As the post-processing algorithm, Keccak, the latest standard of hash algorithm, was rearranged and used. Random numbers with the proposed approach meet the security requirements for cryptographic applications. Furthermore, the NIST 800-22 test suite and autocorrelation test are used to ensure the generated numbers have no statistical weakness. The successful test results demonstrate the security of the generated numbers. An important advantage of the proposed generator does not cause any data loss and perform 100% efficiency although data loss can be up to 70% in some post-processing algorithms.

关键词： Chaotic systems post-processing algorithm post-processing secure random numbers

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：