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基于度量学习的电路焊点缺陷检测方法

北京理工大学学报 2024年第6期44卷 625-634页

作者：刘少丽戚慧志杜浩浩邓超北京理工大学机械与车辆学院北京100081 北京理工大学唐山研究院河北唐山063000 上海航天精密机械研究所上海201600 中国电子科技集团公司第二十九研究所四川成都610036

针对目前电路焊点缺陷检测方法效率低、准确度差、焊点图像样本量小的问题,提出了一种基于度量学习的快速识别焊点缺陷的方法.首先利用工业相机搭配远心镜头获取焊点图像.通过挖掘焊点图像特征,设计交点检测法来分割焊接单元图像,制作... 详细信息

针对目前电路焊点缺陷检测方法效率低、准确度差、焊点图像样本量小的问题,提出了一种基于度量学习的快速识别焊点缺陷的方法.首先利用工业相机搭配远心镜头获取焊点图像.通过挖掘焊点图像特征,设计交点检测法来分割焊接单元图像,制作焊点缺陷数据集.在此基础上,设计焊点图像全局特征与局部表征提取方法来对焊点的两类特征进行融合,并对注意力机制进行改进,加入到全局特征提取模块中.对焊点缺陷的检测实验结果表明该方法最终实现了准确率达到98.4%,满足焊点缺陷检测的实际生产要求.

关键词：焊点检测图像分割深度学习度量学习特征融合

基于线结构光的大型构件表面尺寸加工质量检测方法

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北京理工大学学报 2024年第7期44卷 701-711页

作者：刘少丽杜浩浩何楠黄嘉淳戚慧志北京理工大学机械与车辆学院北京100081 北京理工大学唐山研究院河北唐山063000 北京卫星制造厂有限公司北京100094 上海航天精密机械研究所上海201600

针对大型构件表面尺寸加工质量的高精度三维检测的需求,设计了一套主动式线结构光旋转扫描检测系统.采用相机主动式旋转扫描,适用于不方便移动且跨距大、特征多的大型构件检测.提出了一种新的系统旋转中心快速标定的方法,仅需标靶上一... 详细信息

针对大型构件表面尺寸加工质量的高精度三维检测的需求,设计了一套主动式线结构光旋转扫描检测系统.采用相机主动式旋转扫描,适用于不方便移动且跨距大、特征多的大型构件检测.提出了一种新的系统旋转中心快速标定的方法,仅需标靶上一点即可完成标定,适合大型构件检测的现场快速标定.加入编码机构,可根据被测物的特征变化动态调整扫描速度,提高了系统检测效率和通用性.所有元器件均可单独调用,保证了系统的可扩展性.改善了扫描时的串口逻辑,进一步提高了三维点云的密度.实验结果表明,本系统对标准物体的最大偏差为0.0310 mm,标准差最大为0.0150 mm,对大型构件实物的检测误差在0.05 mm以内,满足大型构件表面特征加工质量的高精度三维检测需求.

关键词：大型构件表面特征检测标定误差检验线结构光旋转扫描

氟康唑联合克霉唑阴道片在霉菌性阴道炎治疗中的疗效评价

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实用妇科内分泌电子杂志 2024年第2期11卷 64-67页

作者：刘绍丽朱博曲靖市第一人民医院妇科云南曲靖655000 曲靖市第一人民医院关节与运动医学科云南曲靖655000

目的分析氟康唑联合克霉唑阴道片治疗霉菌性阴道炎的临床效果。方法选取86例霉菌性阴道炎患者,根据治疗方法不同分为对照组与研究组,每组43例。对照组开展克霉唑阴道片治疗,研究组开展氟康唑联合克霉唑阴道片治疗。比较两组患者的治疗... 详细信息

目的分析氟康唑联合克霉唑阴道片治疗霉菌性阴道炎的临床效果。方法选取86例霉菌性阴道炎患者,根据治疗方法不同分为对照组与研究组,每组43例。对照组开展克霉唑阴道片治疗,研究组开展氟康唑联合克霉唑阴道片治疗。比较两组患者的治疗效果、不良反应发生情况、疾病症状消失时间及炎症因子指标。结果研究组患者治疗总有效率97.67%较对照组81.40%更高(P0.05)。研究组患者的外阴瘙痒、白带异常、腰腹酸痛、尿频、尿痛症状消失时间均较对照组更短(P<0.05)。治疗后,两组患者肿瘤坏死因子-α(TNF-α)、超敏C反应蛋白(hs-CRP)、白介素-4(IL-4)及白介素-6(IL-6)指标均较治疗前下降,且研究组患者较对照组更低(P<0.05)。结论氟康唑联合克霉唑阴道片应用于霉菌性阴道炎治疗中,可提升治疗效果,促进疾病症状消失,并改善患者的炎症因子,值得临床推广。

关键词：氟康唑克霉唑阴道片霉菌性阴道炎临床疗效炎症因子

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成都市职住空间分布特征及影响因素研究

地理与地理信息科学 2024年第1期40卷 81-88页

作者：毕硕本王璐烨刘少丽张丽丽袁聪南京信息工程大学地理科学学院江苏南京210044

为解决传统职住分离测度指标存在的异方差问题,该文采用对数调整就业—居住偏离度,基于成都市的普查数据和地理信息数据,分析街道尺度下成都市主城区人口分布特征和职住空间匹配状况,并借助回归分析方法探讨社会经济要素与建成环境要素... 详细信息

为解决传统职住分离测度指标存在的异方差问题,该文采用对数调整就业—居住偏离度,基于成都市的普查数据和地理信息数据,分析街道尺度下成都市主城区人口分布特征和职住空间匹配状况,并借助回归分析方法探讨社会经济要素与建成环境要素对成都市主城区职住分离的影响。结果表明:①调整后的就业—居住偏离度能消除回归模型中的异方差问题,保障回归结果解释力的有效性;②成都市主城区的就业和居住人口密度整体呈现由中心向外递减的空间分布特征,就业人口趋向市中心集聚,职住分离是主城区的突出特征,二者空间不匹配程度较大;③回归分析结果表明,就业人口密度、居住人口密度、老年系数、性别比、公交/地铁站点密度、路网密度和社会性基础设施密度是影响成都市主城区职住分离的主要因素;④就业主导区和居住主导区产生职住分离的内在动力机制存在差异,且影响就业主导区职住分离的因素更复杂。

关键词：职住分离就业—居住偏离度回归分析成都市

基于DEMATEL模型的智能家居系统设计研究

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设计 2024年第8期37卷 74-77页

作者：姚善良刘少立武汉工程大学艺术设计学院

探究智能家居系统要素构成关系,提高智能家居系统设计的科学性和系统性。整理智能家居产品的主要分类及代表产品,运用决策实验室分析法(DEMATEL)对系统内部各要素的交互关系及因果影响程度进行分析,构建各要素象限分布图,生成要素分布... 详细信息

探究智能家居系统要素构成关系,提高智能家居系统设计的科学性和系统性。整理智能家居产品的主要分类及代表产品,运用决策实验室分析法(DEMATEL)对系统内部各要素的交互关系及因果影响程度进行分析,构建各要素象限分布图,生成要素分布表并总结各要素的作用定位。智能家居系统要素的影响关系明显区别于传统家居系统,各要素权重相对平均且具有较强的联系性,呈现出多层次的复杂系统构成关系。运用DEMATEL模型可以明确智能家居系统中各要素的工作逻辑和影响关系,针对研究结果提出未来智能家居系统的完善策略和设计原则,从而制订更加科学合理的智能家居系统配置方案,为智能家居系统设计实践提供理论依据和路径参考。

关键词：智能家居设计策略 DEMATEL 系统设计家居系统

Accurate Measurement Method for Tube's Endpoints Based on Machine Vision

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Chinese Journal of Mechanical Engineering 2017年第1期30卷 152-163页

作者： liu shaoli JIN Peng liu Jianhua WANG Xiao SUN Peng School of Mechanical Engineering Beijing Institute of TechnologyBeijing 100081China

Tubes are used widely in aerospace vehicles, and their accurate assembly can directly affect the assembling reliability and the quality of products. It is important to measure the processed tube＇s endpoints and then fix any geometric errors correspondingly. However, the traditional tube inspection method is time-consuming and complex operations. Therefore, a new measurement method for a tube＇s endpoints based on machine vision is proposed. First, reflected light on tube＇s surface can be removed by using photometric linearization. Then, based on the optimization model for the tube＇s endpoint measurements and the principle of stereo matching, the global coordinates and the relative distance of the tube＇s endpoint are obtained. To confirm the feasibility, ll tubes are processed to remove the reflected light and then the endpoint＇s positions of tubes are measured. The experiment results show that the measurement repeatability accuracy is 0.167 mm, and the absolute accuracy is 0.328 ram. The measurement takes less than 1 min. The proposed method based on machine vision can measure the tube＇s endpoints without any surface treatment or any tools and can realize on line measurement.

关键词： machine vision non-contact measurement reflection light tube endpoint measurement

Auxiliary stream for optimizing memory access of video decoders

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Science China(Information Sciences) 2014年第1期57卷 41-50页

作者： liu shaoli LI Ling CHEN YunJi HU WeiWu Institute of Computing Technology Chinese Academy of Sciences

Due to the ever increasing resolution and frame rate of mainstream video sequences,memory access has become the main performance bottleneck of video *** reduce the required of-chip memory,many decoders employ on-chip ***,they cannot distinguish whether a data block is reusable due to the lack of the information of undecoded Macro Blocks(MBs),thus often evicting reusable data from the cache and preserving non-reusable data in the cache,which will lead to a waste of of-chip memory *** this paper,we manage to make full use of cache from a novel perspective,i.e.,auxiliary *** speaking,since the memory access behavior of video decoding is determined in video encoding,the encoder can pack the memory access behaviors of video decoding as auxiliary bitstream,which can inform the decoder whether a data block will be reused by future ***,such an auxiliary stream can enable optimal management of *** efectively reduce the size of auxiliary bitstream,we propose an Auxiliary Prior Information Coding(APIC)method complying with the current video *** future video standards,we introduce a Super Block scan Order(SBO)for MB organization to further reduce the bitrate overhead of auxiliary *** above ideas are evaluated on a number of representative video *** additional prior information can reduce the required of-chip memory bandwidth for motion compensation by over 35%(for a 60 kB cache),while only causing less than 2.3%bitrate increase for high definition(HD)videos.

关键词： video decoding video coding memory access motion compensation auxiliary information

Weakly-Supervised Single-view Dense 3D Point Cloud Reconstruction via Differentiable Renderer

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Chinese Journal of Mechanical Engineering 2021年第5期34卷 195-205页

作者： Peng Jin shaoli liu Jianhua liu Hao Huang Linlin Yang Michael Weinmann Reinhard Klein School of Mechanical Engineering Beijing Institute of TechnologyBeijing 100081China Institute of Computer Science II University of Bonn53115 BonnGermany

In recent years,addressing ill-posed problems by leveraging prior knowledge contained in databases on learning techniques has gained much *** this paper,we focus on complete three-dimensional(3D)point cloud reconstruction based on a single red-green-blue(RGB)image,a task that cannot be approached using classical reconstruction *** this purpose,we used an encoder-decoder framework to encode the RGB information in latent space,and to predict the 3D structure of the considered object from different *** individual predictions are combined to yield a common representation that is used in a module combining camera pose estimation and rendering,thereby achieving differentiability with respect to imaging process and the camera pose,and optimization of the two-dimensional prediction error of novel ***,our method allows end-to-end training and does not require supervision based on additional ground-truth(GT)mask annotations or ground-truth camera pose *** evaluation of synthetic and real-world data demonstrates the robustness of our approach to appearance changes and self-occlusions,through outperformance of current state-of-the-art methods in terms of accuracy,density,and model completeness.

关键词： Point clouds reconstruction Differentiable renderer Neural networks Single-view configuration

Stealth-ACK: stealth transmissions of No C acknowledgements

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Science China(Information Sciences) 2017年第9期60卷 21-35页

作者： Jinhua TAO Shi QIU shaoli liu Tianshi CHEN Rui MAO Institute of Computing Technology Chinese Academy of Sciences College of Computer Science and Software Engineering Shenzhen University

Network-on-Chip(No C) is a promising replacement of bus architecture due to its better *** state-of-the-art No Cs, each packet contains several fixed-length flits, which facilitates allocations of network resources but brings in many unused bits. In this paper, we propose a novel technique called Stealth-ACK to effectively address the above problem. Stealth-ACK leverages unused bits in head flits of non-ACK packets to carry and stealthily transmit ACK information. Such stealth transmissions of ACK information effectively reduce not only the amount of dedicated ACK packets on No C, but also the number of unused bits in head flits of non-ACK packets, which significantly reduces wastes on No C bandwidth. Experimental results show that Stealth-ACK averagely increases the throughput of 16 × 16 2-D mesh No C by 11.9%, and averagely reduces the No C latency by 34.8% on application traces of SPLASH-2. Moreover, Stealth-ACK only requires trivial hardware modification to basic router architectures, which incurs negligible power consumption and area cost.

关键词： networks-on-chip acknowledgement packet router architecture optimisation routing algorithm