基于图像自适应增强的轻量级雾天车牌检测和识别算法

针对雾天图像降质带来的车牌识别难题,提出一种采用图像自适应增强的轻量级车牌检测和识别算法。以目标检测网络YOLOv5s和车牌识别网络LPRNet为基础,设计一个改进的图像自适应增强模块级联于YOLOv5s之前,并引入混合注意力(SA)机制改进LPRNet。图像自适应增强模块由带参数的图像去雾和纹理增强模块以及自适应参数预测模块组成。自适应参数预测模块是轻量级卷积神经网络,与YOLOv5s联合训练,为不同程度的带雾图像自动提供合适的去雾和纹理增强参数以获得更准确的车牌检测结果。利用车牌位置的真实标签和实际检测结果,采用混合注意力机制和迁移学习策略得到最终的SA-LPRNet模型,缓解识别模型对检测结果的敏感性以获得更高的车牌识别准确率。在合成的雾天车牌数据集上的实验结果表明：本文算法对雾天车牌检测的mAP@0.5-0.95指标达到70.6%,车牌识别准确率达到93.5%,优于对比算法,且识别速度满足实时性要求。     

煤化工炼焦推焦车自动走行控制系统的研制

研究了PLC用于煤化工炼焦推焦车走行自动控制，实现炉号识别、自动定位功能等的方、法。本系统采用PLC二进制编码原理和位置式接近传感器实现自动炉号识别；采用数字控制变频调速器驱动电机，采用AD61高速计数模块进行反馈修正位置误差，探讨了离散数字处理增量式PID控制算法进行位置误差补偿的条件，保证推焦车自动走行过程中的自动精确定位；通过RS485实现PLC与上位机的通讯和报表管理。该方法和算法研制的系统在实际的推焦车控制系统中得到成功应用。     

基于标签的协同过滤推荐方法研究

传统基于物品的协同过滤算法由于物品相似度矩阵稀疏,推荐准确率不高.针对这一问题,提出一种基于标签和改进杰卡德系数的协同过滤算法,进行电视节目个性化推荐.首先,爬取相关信息对原始数据进行扩充,并利用统计学方法对时间特征进行归一化处理,计算用户偏好系数;然后,统计出现次数较高的类别作为推荐类别标签,并利用改进的杰卡德系数构造标签相似度矩阵;最后,根据推荐类别标签的用户偏好系数计算节目的推荐系数.实验结果表明,基于标签的协同过滤算法可以降低稀疏矩阵对推荐准确率的影响,相比基于物品的协同过滤算法,准确率提高了5％,召回率提高了3.1％.另外,使用改进的杰卡德系数计算相似度,减少了热门标签对推荐系统的影响,进一步将准确率提高了5％,召回率提高了2.3％.     

复杂维修场景下飞机机号的定位识别方法

针对在复杂维修场景下飞机数量较多且体积庞大,无法实现准确高效的识别跟踪目标飞机的问题,提出基于YOLOv4目标检测的飞机机号识别算法,该方法首先利用YOLOv4检测算法获得飞机机型和预测框图像信息,然后通过图像处理算法实现飞机骨架细化,并依据机型获取飞机机号位置信息,最后利用OCR(optical character recognition)识别出目标飞机机号信息。实验结果证明,该算法实现了对飞机机号的识别,准确率为75%,帧率为30帧,可达到实时性的目的。     

基于MCU的物流状态监测装置的研究与设计

在现代物流发展背景下,以保障物流物品安全与完整为目的,以了解装载、运输特定物品的车辆实时运动状态为手段,研究并开发了一款以AT89C52控制器为核心、ADXL345等多传感器协同监测物流运输状态的装置。物流运输车辆的实时行驶状态通过ADXL345模块进行检测,单片机作为主控模块实时控制报警系统,一旦检测信息同设定的安全阈值出现偏差,报警模式自动开启。低成本、模块化使得设计装置能够较好地应用于包装箱的性能检测、物流振动检测、物流监控等产业。     

汽车轮渡智能装载优化方案研究

为进一步提高汽渡船的装载率,提高汽渡公司经济效益,制定更加科学合理的渡船装载方案,结合原有渡运流程,设计了汽渡智能装载流程,建立了汽渡装载模型.在二维装箱BL算法的基础上设计了汽渡装载算法,能自动计算确定车辆的甲板停放位置,通过比较迭代得到最佳装载方案,设计了渡船智能装载系统直接输出甲板车辆停放位置图,实现了智能装载.以G公司历史数据为例,对比各航次渡船智能装载方案,验证了数学模型与算法的正确性和有效性.结果表明,应用此方案装载率平均提高了7.46%,收益提高了15.7%,能有效提高汽车渡船的装载率与汽渡公司经济效益.     

基于RFID技术的位置信息辅助系统

为提高车辆获取位置信息的准确性,基于RFID(射频识别)技术提出一种车辆位置信息辅助系统,在本系统中,将RFID标签铺设至路面上,为装有RFID读卡器车辆提供准确的道路和位置信息系统.根据标签中提供的位置信息,利用车间通信,并依据车辆的运行状态,让无RFID车辆同时能够计算出自身的位置,达到信息扩散与共享的效果.本文结合8种不同的道路状况,进行仿真实验.结果表明:本系统能够在不同的道路状况下良好运行,实现位置信息的扩散与共享.     

一种多目标跨摄像头跟踪技术研究与实现

将行人检测算法和行人重识别算法相结合,提出一种多目标跨摄像头跟踪算法,该算法由行人检测、行人重识别和行人数据关联三大模块组成.首先利用基于YOLOv3的行人检测改进算法检测视频中出现的行人,并保存视频号、帧号和行人的全身位置信息;其次,利用基于生成对抗网络和重排序的行人重识别改进算法,为已检测的行人图片赋予一个标签;最后整合前两步得到的行人信息,生成包含视频中所有行人信息的JSON(JavaScript Object Notation)文件.该算法可以快速、高效地完成多目标跨摄像头跟踪任务,有一定实用价值,在南京市举办的全球人工智能应用大赛中获得了单项奖.     

基于改进YOLOv5的车辆目标检测研究

针对现有目标检测算法在自动驾驶等领域的车辆目标检测中存在检测精度不高,实时性和鲁棒性较差等问题,本文提出一种基于YOLOv5的车辆目标检测方法.本文在YOLOv5s网络模型框架下,引入一次性聚合（OSA）模块优化主干网络结构,提升网络特征提取能力;并采用非局部注意力机制进行特征增强;同时利用加权非极大值抑制方法实现检测框筛选.实验结果表明,在自制车辆检测数据集上,改进网络模型与原YOLOv5s模型相比,平均准确率均值（mAP）提升3%,不同目标类检测的平均准确率（AP）均得到提升,且检测速度满足实时性要求,对于密集车辆和不同光照条件下均能较好实现车辆目标检测.     

改进YOLOv5的多车辆目标实时检测及跟踪算法

多车辆目标跟踪时间主要花费在车辆检测模块和对每个车辆表观特征提取模块,一般情况下,车辆检测和车辆表观特征提取是在不同的神经网络中进行的,且一张图中的车辆目标越多,对车辆表观特征提取耗费时间的也越多,推理时间也相应变长。针对这一问题,基于经典的Tracking-By-Detection模式,提出一种改进的YOLO模型：在YOLO网络中添加ReID特征识别模块,使YOLO在输出目标位置信息的同时输出目标特征信息,以提高算法的跟踪速度。针对车辆间彼此覆盖的情况,提出一种基于动态IOU阈值的非极大抑制算法,以提高算法的跟踪精度。最后将YOLO输出的信息进行数据匹配,从而实现多目标跟踪。在UA-DETRAC数据集上验证改进模型的有效性,实验结果表明,将YOLOv5网络进行改进后运用在目标跟踪算法中,相对于经典的YOLO+DeepSORT跟踪模型,在车辆密集的情景下平均推理时间减少了17%;在改进后的网络上添加动态IOU阈值非极大抑制,跟踪精度提高了3.9个百分点。改进后的模型有较好的实时性与跟踪准确率。     

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.     

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.     

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.     

Characterization of Ordovician carbonate reservoirs, southeastern Saskatchewan, Canada

The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3～4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰～ -7.8‰, PDB) and matrix dolomites (-6.6‰～ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084～0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078～0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.     

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.     

橡胶颗粒沥青混合料低温抗裂性试验研究

以AC-13级配为基础,将橡胶颗粒代替部分集料掺入混合料中,以低温弯曲试验为评价方法对不同橡胶颗粒掺量下沥青混合料的低温抗裂性进行研究,并引入应变能密度值对混合料的低温抗裂性进行综合评价.试验结果表明:橡胶颗粒沥青混合料试件的破坏微应变均超过2 300,满足冬寒区的技术指标;无论是否掺加橡胶颗粒,随着温度的下降,沥青混合料破坏时的最大弯拉强度增大,弯拉应变降低,劲度模量增大;弯曲应变能密度在胶粒掺量为1%左右时具有较大的弯曲应变能密度值,此时橡胶颗粒沥青混合料具有较好的低温抗裂性.     

A computer generator for randomly layered structures

AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…     

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。     

Quantitative trait loci （QTLs） for quality traits related to protein and starch in wheat

Quality traits in wheat （Triticum aestirum L.） were studied by quantitative trait locus （QTL） analysis in a recombinant inbred line （RIL） population, a set of 131 lines derived from Chuan 35050 × Shannong 483 cross （ChSh）. Grains from RILs were assayed for 21 quality traits related to protein and starch. A total of 35 putative QTLs for 19 traits with a single QTL explaining 7.99-40.52% of phenotypic variations were detected on 10 chromosomes, 1D, 2A, 2D, 3B, 3D, 5A, 6A, 6B, 6D, and 7B. The additive effects of 30 QTLs were positive, contributed by Chuan 35050, the remaining 5 QTLs were negative with the additive effect contributed by Shannong 483. For protein traits, 15 QTLs were obtained and most of them were located on chromosomes 1 D, 3B and 6D, while 20 QTLs for starch traits were detected and most of them were located on chromosomes 3D, 6B and 7B. Only 7 QTLs for protein and starch traits were co-located in three regions on chromosomes 1D, 2A and 2D. These protein and starch trait QTLs showed a distinct distribution pattern in certain regions and chromosomes. Twenty-two QTLs were clustered in 6 regions of 5 chromosomes. Two QTL clusters for protein traits were located on chromosomes 1D and 3B, respectively, three clusters for starch traits on chromosomes 3D, 6B and 7B, and one cluster including protein and starch traits on chromosome 1D.     

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.