基于HRNet的轻量化人体姿态估计网络

由于算力和内存的限制，目前的人体姿态估计网络难以广泛应用于移动设备、嵌入式平台.针对这个问题，本文以HRNet为基础框架，提出了一种轻量化的人体姿态估计网络X-HRNet，使用ResNeXt模块替换普通的Basic模块以减少网络的参数和计算复杂度.实验结果表明，所提出模型在COCO验证集上取得了78.2%的精度，比HRNet高1.9%，参数量下降了22.2M，计算量下降了27.3GFLOPs.与以往的轻量化人体姿态估计方法不同，所提出的X-HRNet是一种兼顾精度和轻量化的方法，在保持精度的同时有效减少了计算量和参数量，为嵌入式平台提出了一种新的轻量化人体姿态估计网络.     

面向交通场景的轻量级行人检测算法

针对交通场景下行人检测模型网络复杂、参数量大以及难以在低性能设备上部署的问题,基于YOLOv5s网络模型提出了一种改进的轻量级行人检测算法。首先,使用Ghost模块重构YOLOv5s网络进行特征提取,降低模型的参数量和计算量,提高推理速度。其次,引入坐标注意力机制提高模型对目标特征的提取能力,提升其对小目标行人的检测效果。最后,采用SIoU损失函数加快模型的收敛速度,提高模型的识别准确率。实验结果表明,改进后的算法能保证较高的检测精度,与原始YOLOv5s算法相比参数量减少47.1%,计算量减少48.7%,提高了交通场景下行人检测的速度且易于部署。     

改进型SSD网络的织物瑕疵检测算法

针对传统纺织生产中瑕疵检测精度低、速度慢和模型太大影响部署等问题,提出一种基于改进型SSD(single shot multiBox detector)网络的织物瑕疵检测算法。将RepVGG网络融合SE(squeeze-and-excitation)模块,提出SE-RepVGG网络作为SSD的主干网络;在增强网络特征提取能力的同时,采用结构重参数化方法大幅减少网络的参数量和计算量,以改善实时检测性能;利用深度可分离卷积代替传统卷积,设计DCS(deconvoution-and-squeeze)模块构建SSD的辅助网络,以进一步降低网络计算量;利用K-means聚类算法调整先验框比例,以提升检测精度。实验结果表明,相比原始SSD网络,算法在检测精度上mAP提高34.47%,达到96.96%,网络参数量减少13.01 MB,检测速度为47 F·s^-1,满足工业实时检测需求。     

基于改进YOLOv5s的行人车辆目标检测算法

针对传统的行人车辆目标检测算法因参数量大和计算复杂度高而在现实应用中受限的问题,基于轻量化深度学习网络提出改进的YOLOv5s行人车辆目标检测算法.首先,选用ghost模块替换主干网络中部分卷积模块进行模型剪枝,同时向网络中引入注意力机制,使得网络在减少模型参数量和提升模型性能两方面实现更好的平衡;其次,采用边界框的宽高差值计算代替边界框回归损失函数中宽高比距离的计算,加速网络的收敛;最后,通过构建真实交通场景下的行人车辆目标检测数据集检验模型的准确性和实时性.实验结果表明,在保持原算法较高精度的同时,改进后YOLOv5s算法的参数量下降28%,模型大小降低27%,节省了硬件成本,拓宽了YOLOv5s算法的应用场景.     

DenseNet模型轻量化改进研究

针对深层DenseNet模型在小型数据集上的过拟合问题,提出了一种改进的轻量化DenseNet模型.首先,优化网络中密集连接块(Dense Block)数量和其内部网络结构;然后,提出一种自适应池化层方法,解决改进网络的特征图分辨率适应问题;最后,加入Skip Layer模块增强密集连接块间特征信息流通.实验结果表明,改进方法能够减少模型的参数量和计算量,有效解决了深层DenseNet的过拟合问题.     

基于改进YOLOv4的轻量化目标检测方法

针对检测模型参数量大,难以在嵌入式设备上部署等问题,设计了一种改进的YOLOv4目标检测算法.该算法使用轻量化的MobileNetV1替换CSPDarketnet53主干特征提取网络,并将后续网络中的3×3卷积替换为深度可分离卷积,极大地减少了模型的参数量;在检测头加入NAM注意力模块,增强网络对细节信息的提取能力;采用SDIoU Loss作为边框回归损失,在加快收敛速度的同时提高了检测精度.实验表明：与YOLOv4-CSPDarknet53相比,改进算法在PASCAL VOC07+12数据集上训练出来的模型大小为47.19 M,约为原来的五分之一,FPS提升了40(f/s),mAP提升了2.4%.与YOLOv4-Tiny、YOLOv5s、YOLOv7等目标检测算法相比,具有兼顾检测速度与精度的特点.     

基于YOLOv7-TSCR的连铸坯表面缺陷检测

为解决连铸生产过程中铸坯表面缺陷检测准确率低、检测速度慢、模型参数量大难以部署等问题,提出一种融合重参数化和注意力机制的轻量化铸坯表面缺陷检测算法YOLOv7-TSCR。首先,利用Mish和SiLU激活函数、SimAM注意力机制,构建了改进的高效层聚合模块ELAN-S,以有效增强对多尺度缺陷特征的提取;其次,设计了C2f_RG模块改进特征融合网络,减少参数量的同时获得更丰富的梯度流信息,增强特征融合能力;最后,根据采集实际生产中的缺陷图像,构建铸坯缺陷数据集并进行验证。结果表明：YOLOv7-TSCR相较其他网络模型检测效果显著提升,在模型参数量减小的情况下,精确率达93.5%,平均精度均值提高了2.8%,检测速度可达120 FPS;在NEU-DET公开数据集上进行的泛化性对比实验证明了算法具有较强的泛化性。改进算法在保证较高检测精度的基础上,具有较快的检测速度和较小的参数量,为铸坯表面缺陷的高效检测提供了技术参考。     

基于无锚的轻量化孪生网络目标跟踪算法

针对运算资源受限条件下难以实现高精度、高帧率跟踪的问题,提出一种基于无锚的轻量化孪生网络目标跟踪算法.首先使用修改的轻量级网络MobileNetV3作为主干网络提取特征,在保持深度特征表达能力的同时减小网络的参数量和计算量;然后对传统互相关操作,提出图级联优化的深度互相关模块,通过丰富特征响应图突出目标特征重要信息;最后在无锚分类回归预测网络中,采用特征共享方式减少参数量和计算量以提升跟踪速度.在两个主流数据集OTB2015和VOT2018上进行对比实验,实验结果表明,该算法相比于SiamFC跟踪器有较大的精度优势,并且在复杂跟踪场景下更具鲁棒性,同时跟踪帧率可达175帧/s.     

改进YOLOv5网络模型的车位检测方法

针对目前车位检测方法效率低的问题，提出一种轻量级车位检测方法OG-YOLOv5。首先，基于YOLOv5网络添加车位分隔线方位回归分支，实现车位方位的准确预测，可直接根据网络预测结果推断完整车位信息；其次，通过检测尺度裁剪、Ghost模块重构网络实现模型轻量化；再者，通过在网络主干中引入ECA注意力机制、优化损失函数提高目标预测精度。通过对比实验，结果表明所提OG-YOLOv5网络的mAP达到了98.8%，模型参数量和计算量仅为原模型的32.0%和28.3%，在GPU和CPU上的检测时间分别减少了16.2%和28.1%，车位检测准确率和召回率分别达到了97.75%和96.87%。     

改进残差神经网络在遥感图像分类中的应用

针对传统卷积神经网络随着深度加深而导致网络退化以及计算量大等问题,提出一种改进残差神经网络的遥感图像场景分类方法。该方法以残差网络ResNet50作为主框架,在残差结构中引入深度可分离卷积和分组卷积,减少了网络的参数量和计算量,加快模型收敛的同时也提升了分类精度。此外在网络中嵌入多尺度SE block模块对通道特征进行重校准,提取出更加重要的特征信息,进一步提升了网络的分类性能。在AID和UCMerced_Land Use两个公开数据集上的分类精度分别为91.92%和93.52%,相比常规残差网络分类精度分别提高了3.38%和10.24%,证明所提方法在遥感图像场景分类任务中的可行性和有效性。     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

Design and analysis of generic LBS application developing platform

Location based services is promising due to its novel working style and contents.A software platform is proposed to provide application programs of typical location based services and support new applications developing efficiently. The analysis shows that this scheme is easy implemented, low cost and adapt to all kinds of mobile nework system.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that