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IsoCore – An efficient model to aid rapid forecasting of SARS-CoV-2 infection from biomedical imagery IsoCore -一个有效的模型,帮助从生物医学图像快速预测SARS-CoV-2感染
Q4 Engineering Pub Date : 2023-04-28 DOI: 10.24840/2183-6493_009-003_001636
Faraz Bagwan, N. Pise
Combating the covid19 scourge is a prime concern for the human race today. Rapid diagnosis and isolation of virus-exposed persons is critical to limiting illness transmission. Due to the prevalence of public health crises, reaction-based blood tests are the customary approach for identifying covid19. As a result, scientists are testing promising screening methods like deep layered machine learning on chest radiographs. Despite their usefulness, these approaches have large computational costs, rendering them unworkable in practice. This study's main goal is to establish an accurate yet efficient method for covid19 predicting using chest radiography pictures. We utilize and enhance the graph-based family of neural networks to achieve the stated goal. The IsoCore algorithm is trained on a collection of X-ray images separated into four categories: healthy, Covid19, viral pneumonia, and bacterial pneumonia. The IsoCore, which has 5 to 10 times fewer parameters than the other tested designs, attained an overall accuracy of 99.79%. We believe the acquired results are the most ideal in the deep inference domain at this time. This proposed model might be employed by doctors via phones.
抗击新冠肺炎疫情是当今人类最关心的问题。快速诊断和隔离病毒接触者对于限制疾病传播至关重要。由于公共卫生危机的普遍存在,基于反应的血液检测是识别covid - 19的习惯方法。因此,科学家们正在胸部x光片上测试有前途的筛查方法,如深层机器学习。尽管它们很有用,但这些方法有很大的计算成本,使它们在实践中不可行。本研究的主要目标是建立一种准确而有效的胸片预测方法。我们利用并增强基于图的神经网络家族来实现既定目标。IsoCore算法是在一组x射线图像上进行训练的,这些图像分为四类:健康、covid - 19、病毒性肺炎和细菌性肺炎。IsoCore的参数比其他测试设计少5到10倍,总体精度达到99.79%。我们认为得到的结果是目前深度推理领域最理想的。医生可能会通过电话采用这种模式。
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引用次数: 0
From Education to Research 从教育到研究
Q4 Engineering Pub Date : 2023-04-20 DOI: 10.24840/2183-6493_009-002_002133
Paulo Pinho
This paper provides a brief account of the creation and evolution of the CITTA R&D Unit, which, in the early 2000s, emerged from the SPTA, the Planning Division of FEUP’s Civil Engineering Department (DEC). Attention is given to the birth of the Centre, marked by the convergence of some favourable external and internal conditions, which also shaped its composition, structure, and scientific scope. The CITTA development phase is then characterised. This phase was influenced by the pluriannual evaluation of the FCT in 2008 and, a few years later, by the integration of a large group of researchers from the University of Coimbra, which justified the profound revision of the CITTA’s internal regulations. Finally, the paper addresses the Centre's consolidation phase, emphasising the role and importance of the two last pluriannual FCT evaluations, the relative position of the Centre's publication performance compared to similar centres in Europe, and its strategic plan, conceived around the low-carbon cities paradigm.Author Keywords. civil engineering, Porto Faculty of Engineering, Planning Division.
本文简要介绍了CITTA研发部门的创建和发展,该部门在21世纪初从SPTA, FEUP土木工程系(DEC)的规划部(SPTA)中脱颖而出。人们注意到该中心的诞生,其标志是一些有利的外部和内部条件的汇合,这些条件也形成了该中心的组成、结构和科学范围。然后描述了CITTA的发展阶段。这一阶段受到2008年对FCT的多年评估的影响,几年后,来自科英布拉大学的一大批研究人员的整合,证明了对CITTA内部法规的深刻修订是合理的。最后,本文讨论了中心的巩固阶段,强调了最近两次多年期FCT评估的作用和重要性,中心的出版表现与欧洲同类中心相比的相对地位,以及围绕低碳城市范式构思的战略计划。作者关键词。土木工程,波尔图工程学院,规划部。
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引用次数: 0
Planning Thoughts – The evolution of themes in Master Dissertations and Doctoral Theses in the field of specialisation in Spatial Planning, FEUP 规划思想-空间规划专业领域硕士学位论文和博士论文主题的演变
Q4 Engineering Pub Date : 2023-04-20 DOI: 10.24840/2183-6493_009-002_002071
Paulo Conceição, Isabel Breda Vázquez, Fernando Brandão Alves, Ana Rita Sousa, Jorge Afonso Rios, Daniel Sampaio Tavares
The formal existence of a specialisation in spatial planning at FEUP dates back 50 years. The present paper aims to contribute to the analysis of this experience, and to some extent of its contributions, by tracing the evolution of the themes of MSc dissertations and PhD thesis. under the scope of the different spatial planning specialisation courses. After a brief contextualisation, which refers to changes in higher education in Portugal and in FEUP, the paper answers two research questions: How did the themes of Master Dissertations and Doctoral Theses in Spatial Planning evolve within this field of specialisation in FEUP? How do the themes in the field of Spatial Planning correlate between themselves? To this end, methodologies of content analysis of metadata, titles, and abstracts (CAMTA) and cluster analysis based on the software VOSviewer were applied. The increasing number of publications and themes, which reflect the consolidation of this field of specialisation, and the permanence of three major research clusters, which are thus a characteristic of the planning approach developed at FEUP, constitute some of the main results of the study.
FEUP空间规划专业的正式存在可以追溯到50年前。本文旨在通过追踪硕士论文和博士论文主题的演变,对这一经验进行分析,并在一定程度上做出贡献。在不同的范围内开设了空间规划专业课程。在简要介绍了葡萄牙和FEUP高等教育的变化之后,本文回答了两个研究问题:在FEUP的这个专业领域内,空间规划硕士论文和博士论文的主题是如何演变的?空间规划领域的主题是如何相互关联的?为此,采用元数据、标题和摘要内容分析(CAMTA)和基于VOSviewer软件的聚类分析方法。越来越多的出版物和主题反映了这一专业领域的巩固,以及三个主要研究集群的持久性,这是FEUP制定的规划方法的一个特点,构成了这项研究的一些主要成果。
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引用次数: 0
Reflexions on an ENVI-met operation-methodology case study 对ENVI-met操作方法案例研究的反思
Q4 Engineering Pub Date : 2023-04-20 DOI: 10.24840/2183-6493_009-002_001949
Philipp Barnstorf, Fernando Brandão Alves, C. Pimenta do Vale
An ENVI-met-operating methodology is case-studied aiming at contributing to the experience-exchange in ENVI-met’s applied-to-practice operation and providing its developers with feedback.The operating methodology is explained in detail as being applied – in an earlier research partnership with a city council’s urban-projects division – on an actual urban-street-requalification project.Daytime and night-time pedestrian-thermal-comfort impact of different intervention scenarios – differing both in soil-cover types and/or street-trees numbers and arrangements – were assessed and compared during a significant heat-wave event.The results seem to reveal a significant ENVI-met limitation on modelling green pergolas – open-wire-trellis overhang covered with climber plants.
本文对ENVI-met操作方法进行了案例研究,旨在促进ENVI-met应用于实践操作的经验交流,并为其开发人员提供反馈。在与市议会城市项目部门的早期研究伙伴关系中,详细解释了在实际的城市街道资格再认证项目中应用的操作方法。在一次重大热浪事件中,评估和比较了不同干预方案对日间和夜间行人热舒适的影响——不同的土壤覆盖类型和/或街道树木的数量和安排。结果似乎揭示了一个显着的ENVI-met对绿色藤架建模的限制-开放的电线网格悬垂覆盖着攀缘植物。
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引用次数: 0
Forming the Spatial Planning Division at the Department of Civil Engineering, University of Porto 成立波尔图大学土木工程系空间规划部
Q4 Engineering Pub Date : 2023-02-14 DOI: 10.24840/2183-6493_009-002_002028
Luís Valente de Oiveira
Forming the Spatial Planning Division
成立空间规划科
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引用次数: 0
Assessing Budget Risk with Monte Carlo and Time Series Bootstrap 用蒙特卡罗法和时间序列法评估预算风险
Q4 Engineering Pub Date : 2023-01-23 DOI: 10.24840/2183-6493_009-001_000976
André Pereira, André Gomes
Budgets are important management tools recognized for their help in planning, communication, monitoring the expense  performance, and even motivating collaborators. However, recently there has been criticism of the traditional Budgeting Process due to its cumbersomeness, long duration, and eventual diversion of the focus from the day-to-day activities. Thus, improving the Budgeting Process by incorporating Expense component uncertainties is of uttermost importance to accelerate its approval.This paper presents a methodology for companies to assess their budget risk based on their historical Expense data by applying Monte Carlo Simulation and Time Series Bootstrapping Techniques. Besides, some state-of-the-art sensitivity Importance Measures are also implemented to help evaluate the relative importance of the Expense components. The methodology proposed, based on a real case study with data from a major Portuguese retailer, has the advantage of being objective and supported by data, thus not being subject to bias from the management.
预算是重要的管理工具,被认为有助于计划、沟通、监控费用表现,甚至激励合作者。然而,最近有人批评传统的预算编制过程,因为它的繁琐,持续时间长,并最终转移了日常活动的重点。因此,通过纳入费用构成的不确定性来改进预算编制过程对于加快其批准是至关重要的。本文提出了一种方法,为公司评估他们的预算风险基于他们的历史费用数据应用蒙特卡罗模拟和时间序列引导技术。此外,还实施了一些最先进的灵敏度重要性措施,以帮助评估费用组成部分的相对重要性。所提出的方法,基于一个真实的案例研究,数据来自一个主要的葡萄牙零售商,具有客观和数据支持的优势,因此不会受到来自管理层的偏见。
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引用次数: 1
Design and Performance Analysis of Three Phase Line Start Synchronous Reluctance Motor Using Finite Element Analysis 三相线启动同步磁阻电动机的设计与性能有限元分析
Q4 Engineering Pub Date : 2023-01-23 DOI: 10.24840/2183-6493_009-001_001169
M. Chaudhari, A. Chowdhury
Three-phase Induction Motors (TPIM) are popular in industrial applications due to their numerous advantages. However, TPIM has comparatively lower efficiency than modern motor technologies like permanent magnet synchronous motor(PMSM), synchronous reluctance motor(SynRM), or switched reluctance motor(SRM). The expensive rare earth material and the inability of line starting operation discourage the replacement of TPIM with these modern energy-efficient motors. This research proposes a novel conversion of TPIM into Line Start SynRM (LS-SynRM) to cause a cost-effective and compatible performance solution. The proposed design modifications are carried out on the existing 0.5HP, TPIM rotor and analyzed using finite element (FE) software. The optimum barrier parameters such as barrier end width, barrier position, barrier width, and rib width have been determined through parametric analysis. The considerable effect of barrier dimensions on motor performance is evident from the analysis.
三相感应电动机(TPIM)由于其众多优点而在工业应用中广受欢迎。然而,与永磁同步电机(PMSM)、同步磁阻电机(SynRM)或开关磁阻电机(SRM)等现代电机技术相比,TPIM的效率相对较低。昂贵的稀土材料和无法启动的线路运行阻碍了用这些现代节能电机替代TPIM。本研究提出一种将TPIM转换为线路启动SynRM (LS-SynRM)的新方法,以实现成本效益和兼容的性能解决方案。对现有的0.5HP TPIM转子进行了设计修改,并利用有限元软件进行了分析。通过参数分析,确定了最优屏障参数:屏障端宽、屏障位置、屏障宽度和肋宽。从分析中可以明显看出屏障尺寸对运动性能的显著影响。
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引用次数: 0
Pedestrian Gap Acceptance Behavioral Modelling at Midblock and Uncontrolled Intersections 街区中与非控制交叉口行人间隙接受行为模型研究
Q4 Engineering Pub Date : 2023-01-23 DOI: 10.24840/2183-6493_009-001_001113
L. Govinda, K. Ravishankar
Pedestrian safety is one of the major concerns and pedestrian gap acceptance (PGA) behaviour depends on various characteristics of pedestrians, vehicles, geometry and environment. This study is intended to develop PGA models at various pedestrian crossing locations (mid-blocks and uncontrolled intersections). Video graphic data was collected from four different pedestrian crossing locations and extracted the required data from videos manually. The multiple linear regression (MLR) technique was used to model the pedestrian gap acceptance behaviour by the vehicular gap size accepted by the pedestrians. MLR models reveal that the frequency of attempts significantly affects the PGA behaviour only in the case of mid-blocks whereas the frequency of disturbances significantly affects only in the case of intersections. The statistical results showed that the pedestrian road crossing behaviour depends on the type of crossing location also. The results can be used to analyse the pedestrian safety levels at various crossing locations.
行人安全是人们关注的主要问题之一,行人间隙接受(PGA)行为取决于行人、车辆、几何形状和环境的各种特征。本研究的目的是在不同的人行横道位置(中间街区和不受控制的十字路口)开发PGA模型。在四个不同的人行横道位置采集视频图形数据,并手动提取视频数据。采用多元线性回归(MLR)技术,根据行人接受的车辆间隙大小对行人间隙接受行为进行建模。MLR模型显示,尝试的频率仅在中间街区的情况下显著影响PGA行为,而干扰的频率仅在交叉路口的情况下显著影响。统计结果表明,行人过马路的行为也与路口位置的类型有关。研究结果可用于分析不同路口位置的行人安全水平。
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引用次数: 0
U-Net Architectures for Prostate Cancer Radiation Therapy 前列腺癌放射治疗的U-Net架构
Q4 Engineering Pub Date : 2023-01-23 DOI: 10.24840/2183-6493_009-001_001551
B. Mendes, Inês Domingues, João A. M. Santos
Prostate Cancer (PCa) was first diagnosed in 1853 as cirrhosis of the prostate gland. Silently asymptomatic, PCa is usually diagnosed with Digital Rectal Examination (DRE) and Prostate Specific Antigen (PSA) levels. Since the first treatment of an advanced prostatic malignancy with X-rays by Imbert and Imbert in 1904, External Beam Radiation Therapy (EBRT) is now a curative option for localised and locally advanced disease and a palliative option for the metastatic low-volume disease. With the introduction of computers in EBRT and better imaging techniques, volume delineation is still a very time-consuming task. While Deep Learning methods are urged, EBRT systems still rely on manual or semi-automatic segmentation techniques. The U-Net architecture was specially designed for medical image segmentation presenting promising results. This literature review gathers work using U-Net architectures, outlining methods, techniques and obtained outcomes as a potential foundation for an automated segmentation framework for PCa.
前列腺癌(PCa)于1853年首次被诊断为前列腺肝硬化。前列腺癌无症状,通常通过直肠指检(DRE)和前列腺特异性抗原(PSA)水平诊断。自从Imbert和Imbert在1904年首次用x射线治疗晚期前列腺恶性肿瘤以来,外部束放射治疗(EBRT)现在是局部和局部晚期疾病的治疗选择,也是转移性小体积疾病的姑息治疗选择。随着EBRT中计算机的引入和更好的成像技术,体积描绘仍然是一项非常耗时的任务。虽然深度学习方法是迫切需要的,但EBRT系统仍然依赖于手动或半自动分割技术。U-Net架构是专门为医学图像分割而设计的,具有良好的效果。这篇文献综述收集了使用U-Net架构的工作,概述了方法、技术和获得的结果,作为PCa自动分割框架的潜在基础。
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引用次数: 0
Production of an Office Stapler by Material Extrusion Process, using DfAM as Optimization Strategy 基于DfAM优化策略的材料挤压生产办公订书机
Q4 Engineering Pub Date : 2023-01-23 DOI: 10.24840/2183-6493_009-001_001635
C. Oliveira, Mariana Maia, Jose M. Costa
For the last few decades, the rapid growth of Additive Manufacturing (AM) technologies has been seeable. It is expected to keep maturing continuously due to its advantages compared to conventional manufacturing technologies: flexibility, reliability, energy consumption, and material efficiency. This research article addresses the development and production of a stapler using the Material Extrusion AM process. It is intended to show the development steps to redesign an everyday stapler, into an added-value tool, from the selection and fixture of the CAD model and generative design through Fusion 360 to its optimization on nTopology, simulation, and plot of the part in Eiger.
在过去的几十年里,增材制造(AM)技术的快速发展是可以看到的。与传统制造技术相比,它具有灵活性、可靠性、能源消耗和材料效率等优势,预计将不断成熟。本文研究了一种采用材料挤压增材制造工艺的订书机的开发和生产。它旨在展示重新设计日常订书机的开发步骤,成为增值工具,从CAD模型的选择和夹具以及通过Fusion 360生成设计到其在Eiger中对nTopology,仿真和部分绘图的优化。
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引用次数: 1
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U.Porto Journal of Engineering
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