首页 > 最新文献

Acta Scientiarum-technology最新文献

英文 中文
GUI-CAD Tool to assist the multiclass classification of mammary pathologies by infrared images 利用红外图像辅助乳腺病理多分类的GUI-CAD工具
IF 0.8 4区 综合性期刊 Q2 Mathematics Pub Date : 2022-07-28 DOI: 10.4025/actascitechnol.v44i1.60535
K. Queiroz, M. C. Araújo, Hugo Dourado, R. C. Lima
Infrared thermography is a potential method to improve efficiency for early detection of breast cancer. This technique does not use ionizing radiation and is feasible for screening in men and for detecting changes in young women. In this study, ninety-eight infrared images were used to create a database to develop a computer-aided diagnosis system. Typically, this kind of system is associated with graphical interfaces to facilitate users’ work. In this study, the computer-aided diagnosis was implemented based on statistical classifiers for analysis of four classes: Malignant Tumor, Benign Tumor, Cyst and Healthy. The region of interest was segmented in automatic and semiautomatic ways, which is respectively associated with the Support Vector Machine classifier and Mahalanobis classifier. To evaluate the performance of the proposed classifiers, a confusion matrix was applied to each result obtained. Using the proposed GUI-CAD tool, it was possible to carry out individual and unsupervised classification of patients, with 93% sensitivity.
红外热像仪是一种有潜力提高乳腺癌早期检测效率的方法。该技术不使用电离辐射,可用于男性筛查和检测年轻女性的变化。本研究利用98张红外影像建立数据库,开发计算机辅助诊断系统。通常,这类系统与图形界面相关联,以方便用户的工作。本研究采用基于统计分类器的计算机辅助诊断方法,对恶性肿瘤、良性肿瘤、囊肿和健康四类进行分析。利用支持向量机分类器和Mahalanobis分类器分别对感兴趣区域进行自动和半自动分割。为了评估所提出的分类器的性能,对得到的每个结果应用混淆矩阵。使用提出的GUI-CAD工具,可以对患者进行个体和无监督分类,灵敏度为93%。
{"title":"GUI-CAD Tool to assist the multiclass classification of mammary pathologies by infrared images","authors":"K. Queiroz, M. C. Araújo, Hugo Dourado, R. C. Lima","doi":"10.4025/actascitechnol.v44i1.60535","DOIUrl":"https://doi.org/10.4025/actascitechnol.v44i1.60535","url":null,"abstract":"Infrared thermography is a potential method to improve efficiency for early detection of breast cancer. This technique does not use ionizing radiation and is feasible for screening in men and for detecting changes in young women. In this study, ninety-eight infrared images were used to create a database to develop a computer-aided diagnosis system. Typically, this kind of system is associated with graphical interfaces to facilitate users’ work. In this study, the computer-aided diagnosis was implemented based on statistical classifiers for analysis of four classes: Malignant Tumor, Benign Tumor, Cyst and Healthy. The region of interest was segmented in automatic and semiautomatic ways, which is respectively associated with the Support Vector Machine classifier and Mahalanobis classifier. To evaluate the performance of the proposed classifiers, a confusion matrix was applied to each result obtained. Using the proposed GUI-CAD tool, it was possible to carry out individual and unsupervised classification of patients, with 93% sensitivity.","PeriodicalId":7140,"journal":{"name":"Acta Scientiarum-technology","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2022-07-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85535411","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Physicochemical properties, mineral and fatty acids composition of Jackfruit seeds flour of two varieties from Brazilian Midwest 巴西中西部两个品种菠萝蜜种子面粉的理化性质、矿物质和脂肪酸组成
IF 0.8 4区 综合性期刊 Q2 Mathematics Pub Date : 2022-07-28 DOI: 10.4025/actascitechnol.v44i1.60187
Vagno França Hajj, A. P. Lopes, J. Visentainer, M. E. Petenuci, G. Fonseca
Jackfruit seeds are usually discarded as waste. Therefore, this work aimed at obtaining the Jackfruit seeds flour of two varieties (soft and firm) from Brazilian Midwest and to evaluate its physicochemical characteristics, mineral and fatty acids composition (FA). Seeds were dried at 45°C for 72h and ground (40-mesh). Both flours revealed high protein content, varying from 13.43% to 16.28%. It also revealed excellent insoluble fibers (4.16% for soft Jackfruit seeds flour [SJF] and 4.68% for firm Jackfruit seeds flours [FJF]) content. Plus, it was good sources of minerals, especially magnesium (approximately 200 mg 100g-1). Oleic acid was predominant in FJF (47.03%) and linoleic acid (30.81%) in SJF. The flour from both seeds presented minor contents of acid α-linolenic acid (approximately 5%). Consequently, both seeds flours are strongly indicated for formulating new food products, improving its nutritional value and promoting beneficial effects on human health.
菠萝蜜的种子通常被当作废物丢弃。因此,本研究旨在从巴西中西部地区获得两个品种(软质和硬质)的菠萝蜜种子粉,并对其理化特性、矿物质和脂肪酸组成(FA)进行评价。种子在45°C下干燥72h,研磨(40目)。两种面粉的蛋白质含量都很高,从13.43%到16.28%不等。不溶性纤维含量为4.16%(软质菠萝蜜籽粉[SJF])和4.68%(硬质菠萝蜜籽粉[FJF])。此外,它是矿物质的良好来源,尤其是镁(大约200毫克100克)。以油酸为主(47.03%),亚油酸为主(30.81%)。两种种子制得的面粉中α-亚麻酸含量均较低(约为5%)。因此,这两种种子面粉被强烈建议用于制定新的食品,提高其营养价值和促进对人类健康的有益影响。
{"title":"Physicochemical properties, mineral and fatty acids composition of Jackfruit seeds flour of two varieties from Brazilian Midwest","authors":"Vagno França Hajj, A. P. Lopes, J. Visentainer, M. E. Petenuci, G. Fonseca","doi":"10.4025/actascitechnol.v44i1.60187","DOIUrl":"https://doi.org/10.4025/actascitechnol.v44i1.60187","url":null,"abstract":"Jackfruit seeds are usually discarded as waste. Therefore, this work aimed at obtaining the Jackfruit seeds flour of two varieties (soft and firm) from Brazilian Midwest and to evaluate its physicochemical characteristics, mineral and fatty acids composition (FA). Seeds were dried at 45°C for 72h and ground (40-mesh). Both flours revealed high protein content, varying from 13.43% to 16.28%. It also revealed excellent insoluble fibers (4.16% for soft Jackfruit seeds flour [SJF] and 4.68% for firm Jackfruit seeds flours [FJF]) content. Plus, it was good sources of minerals, especially magnesium (approximately 200 mg 100g-1). Oleic acid was predominant in FJF (47.03%) and linoleic acid (30.81%) in SJF. The flour from both seeds presented minor contents of acid α-linolenic acid (approximately 5%). Consequently, both seeds flours are strongly indicated for formulating new food products, improving its nutritional value and promoting beneficial effects on human health.","PeriodicalId":7140,"journal":{"name":"Acta Scientiarum-technology","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2022-07-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79364047","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Cross-cultural usability evaluation of AI-based adaptive user interface for mobile applications 基于人工智能的移动应用自适应用户界面的跨文化可用性评估
IF 0.8 4区 综合性期刊 Q2 Mathematics Pub Date : 2022-07-28 DOI: 10.4025/actascitechnol.v44i1.61112
Mahdi H. Miraz, Maaruf Ali, P. Excell
With the widespread purchase of mobile communication devices and their extensive usage in every aspect of life, allied with global mobility and market penetration – a more culturally universally adaptable interface has become a priority. This pliable interface must conform continuously with the changing abilities of the end user and the person’s culture, irrespective of the prevailing ambient culture. The information required to customise this interface must be derived from the user’s actual digital footprint and not on their feedback. This treatise presents the usability evaluation results of a culturally inclusive and ubiquitous mobile learning (M-Learning) platform (‘Mobile Academy’), with an AI-based adaptive user interface which takes the snapshot of the installed apps on a smartphone as input, predicts the user’s cultural affiliation as well as the language preference and thus offer a culturally customised user interface as the output. The proof of concept (PoC) prototype has been developed based on the CIAUI (Culturally Inclusive Adaptive User Interface) framework, using plasticity of user interface techniques. This approach was taken to test the affordability of developing inclusive applications, considering the ever growing large global culturally diverse user base. Usability evaluation was then conducted and the results carefully analysed. The results indicated that the PoC exhibited enhanced cross-cultural usability and affordability of such techniques. The evaluation results of the PoC also advocates in favour of the user’s cultural profiling based on the mobile usage data, particularly a single snapshot of installed apps. The research provides direction for future research and application development.
随着移动通信设备的广泛购买及其在生活各个方面的广泛使用,加上全球移动性和市场渗透,一个更具文化普遍适应性的界面已成为当务之急。这种柔韧的界面必须不断适应终端用户的能力变化和个人文化,而不管当前的环境文化如何。定制此接口所需的信息必须来自用户的实际数字足迹,而不是他们的反馈。本文介绍了一个文化包容性和无处不在的移动学习(M-Learning)平台(“移动学院”)的可用性评估结果,该平台具有基于人工智能的自适应用户界面,该界面将智能手机上安装的应用程序的快照作为输入,预测用户的文化归属感以及语言偏好,从而提供文化定制的用户界面作为输出。概念验证(PoC)原型基于CIAUI(文化包容性自适应用户界面)框架,利用用户界面技术的可塑性进行开发。采用这种方法是为了测试开发包容性应用程序的可负担性,考虑到不断增长的庞大的全球文化多样性用户群。然后进行可用性评估,并仔细分析结果。结果表明,PoC的跨文化可用性和可负担性都有所提高。PoC的评估结果也支持基于手机使用数据的用户文化分析,特别是已安装应用的单个快照。该研究为今后的研究和应用开发提供了方向。
{"title":"Cross-cultural usability evaluation of AI-based adaptive user interface for mobile applications","authors":"Mahdi H. Miraz, Maaruf Ali, P. Excell","doi":"10.4025/actascitechnol.v44i1.61112","DOIUrl":"https://doi.org/10.4025/actascitechnol.v44i1.61112","url":null,"abstract":"With the widespread purchase of mobile communication devices and their extensive usage in every aspect of life, allied with global mobility and market penetration – a more culturally universally adaptable interface has become a priority. This pliable interface must conform continuously with the changing abilities of the end user and the person’s culture, irrespective of the prevailing ambient culture. The information required to customise this interface must be derived from the user’s actual digital footprint and not on their feedback. This treatise presents the usability evaluation results of a culturally inclusive and ubiquitous mobile learning (M-Learning) platform (‘Mobile Academy’), with an AI-based adaptive user interface which takes the snapshot of the installed apps on a smartphone as input, predicts the user’s cultural affiliation as well as the language preference and thus offer a culturally customised user interface as the output. The proof of concept (PoC) prototype has been developed based on the CIAUI (Culturally Inclusive Adaptive User Interface) framework, using plasticity of user interface techniques. This approach was taken to test the affordability of developing inclusive applications, considering the ever growing large global culturally diverse user base. Usability evaluation was then conducted and the results carefully analysed. The results indicated that the PoC exhibited enhanced cross-cultural usability and affordability of such techniques. The evaluation results of the PoC also advocates in favour of the user’s cultural profiling based on the mobile usage data, particularly a single snapshot of installed apps. The research provides direction for future research and application development.","PeriodicalId":7140,"journal":{"name":"Acta Scientiarum-technology","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2022-07-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79403642","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Integrating corpus-based and NLP approach to extract terminology and domain-oriented information: an example of US military corpus 整合基于语料库和自然语言处理的方法提取术语和面向领域的信息:以美国军事语料库为例
IF 0.8 4区 综合性期刊 Q2 Mathematics Pub Date : 2022-07-28 DOI: 10.4025/actascitechnol.v44i1.60486
Liang-Ching Chen, Kuei-Hu Chang, Shu-Ching Yang
Within the modern information, communication and technology (ICT), seeking high efficient and accurate corpus-based approaches to process natural language data (NLD) is critical. Traditional corpus-based approaches for processing corpus (i.e. the collected NLD) mainly focused on quantifying and ranking words for assisting human in extracting keywords. However, traditional corpus-based approaches cannot identify the meanings behind the words to properly extract terminologies nor their information. To address this issue, the main objective of this paper is to propose an integrated linguistic analysis approach that combines two corpus-based approaches and a rule-based natural language processing (NLP) approach to extract and identify terminologies and create the text database for extracting deeper domain-oriented information by using the terminologies as channels to retrieve core information from the target corpus. Military domain is an uncommon research field and often classified as confidential data, which caused little researches to focus on. Nevertheless, military information is vital to national security and should not be ignored. Hence, to verify the proposed approach in extracting terminologies and information of the terminologies, the researchers adopt the US Army field manual (FM) 8-10-6 as the target corpus and empirical case. Compared with AntConc 3.5.8 and Tongpoon-Patanasorn’s hybrid approach, the results indicate that from the perspectives of terminology identification, texts database creation, domain knowledge extraction, only the proposed approach can handle all these issues.
在现代信息、通信和技术(ICT)中,寻求高效、准确的基于语料库的方法来处理自然语言数据(NLD)至关重要。传统的基于语料库的语料库(即收集到的NLD)处理方法主要集中在对词进行量化和排序,以帮助人类提取关键词。然而,传统的基于语料库的方法无法识别单词背后的含义,从而无法正确提取术语及其信息。为了解决这一问题,本文的主要目标是提出一种集成的语言分析方法,该方法结合了两种基于语料库的方法和基于规则的自然语言处理(NLP)方法来提取和识别术语,并创建文本数据库,通过将术语作为从目标语料库中检索核心信息的通道来提取更深层次的面向领域的信息。军事领域是一个不常见的研究领域,经常被列为机密数据,因此研究很少受到关注。然而,军事情报对国家安全至关重要,不应被忽视。因此,为了验证所提出的方法在提取术语和术语信息方面的有效性,研究人员采用美国陆军野战手册(FM) 8-10-6作为目标语料库和经验案例。与AntConc 3.5.8和Tongpoon-Patanasorn的混合方法相比,结果表明,从术语识别、文本数据库创建、领域知识提取等方面来看,只有本文提出的方法才能解决所有这些问题。
{"title":"Integrating corpus-based and NLP approach to extract terminology and domain-oriented information: an example of US military corpus","authors":"Liang-Ching Chen, Kuei-Hu Chang, Shu-Ching Yang","doi":"10.4025/actascitechnol.v44i1.60486","DOIUrl":"https://doi.org/10.4025/actascitechnol.v44i1.60486","url":null,"abstract":"Within the modern information, communication and technology (ICT), seeking high efficient and accurate corpus-based approaches to process natural language data (NLD) is critical. Traditional corpus-based approaches for processing corpus (i.e. the collected NLD) mainly focused on quantifying and ranking words for assisting human in extracting keywords. However, traditional corpus-based approaches cannot identify the meanings behind the words to properly extract terminologies nor their information. To address this issue, the main objective of this paper is to propose an integrated linguistic analysis approach that combines two corpus-based approaches and a rule-based natural language processing (NLP) approach to extract and identify terminologies and create the text database for extracting deeper domain-oriented information by using the terminologies as channels to retrieve core information from the target corpus. Military domain is an uncommon research field and often classified as confidential data, which caused little researches to focus on. Nevertheless, military information is vital to national security and should not be ignored. Hence, to verify the proposed approach in extracting terminologies and information of the terminologies, the researchers adopt the US Army field manual (FM) 8-10-6 as the target corpus and empirical case. Compared with AntConc 3.5.8 and Tongpoon-Patanasorn’s hybrid approach, the results indicate that from the perspectives of terminology identification, texts database creation, domain knowledge extraction, only the proposed approach can handle all these issues.","PeriodicalId":7140,"journal":{"name":"Acta Scientiarum-technology","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2022-07-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77891346","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Detection of retinal diseases from ophthalmological images based on convolutional neural network architecture 基于卷积神经网络架构的眼科图像视网膜疾病检测
IF 0.8 4区 综合性期刊 Q2 Mathematics Pub Date : 2022-07-28 DOI: 10.4025/actascitechnol.v44i1.61181
Safiye Pelin Taş, Sezin Barın, Gür Emre Güraksın
The retina is an eye layer that incorporates light- and color-sensitive cells as well as nerve fibers. It collects light and distributes it to the brain for image processing through the use of the optic nerve. Diseases that end up causing vision loss and blindness are generated by retinal ailments. As a result, it is imperative to diagnose and treat certain disorders as early as possible. Optical coherence tomography (OCT), an angiography imaging technique, is operated to help diagnose retinal disorders. Deep learning approaches, which are extensively utilized, have now become a convenient way for diagnosing retinal illnesses through OCT images as a result of their effective outcomes in interpreting medical images. To diagnose retinal disorders utilizing OCT scans, this investigation developed a hybrid methodology based on image pre-processing and convolutional neural networks (CNNs) (a deep learning method). Image pre-processing techniques including background filling, resizing, noise reduction, and highlighting are exercised at the pre-processing stage. The segmentation process provides a new CNN architecture with five convolution layers that does have a low computational cost. Compared to other publications using the same data set, the proposed method seems to have a success rate of 99.48 percent in the detection of retinal disorders, closing a significant gap in the literature. The proposed approach has the advantage of maintaining low computing costs in comparison to other studies in the literature. When the conclusions are regarded, it is noticed that the suggested method might be exerted as a decision support system to assist physicians in the clinical context during the diagnosis of retinal disorders.
视网膜是眼睛的一层,包括对光和颜色敏感的细胞以及神经纤维。它收集光线,并通过视神经将其分配给大脑进行图像处理。最终导致视力丧失和失明的疾病是由视网膜疾病引起的。因此,必须尽早诊断和治疗某些疾病。光学相干断层扫描(OCT)是一种血管成像技术,用于帮助诊断视网膜疾病。深度学习方法被广泛使用,由于其在解释医学图像方面的有效结果,现在已成为通过OCT图像诊断视网膜疾病的一种方便方法。为了利用OCT扫描诊断视网膜疾病,本研究开发了一种基于图像预处理和卷积神经网络(cnn)(一种深度学习方法)的混合方法。图像预处理技术包括背景填充、调整大小、降噪和突出显示。分割过程提供了一种具有五个卷积层的新CNN架构,其计算成本较低。与使用相同数据集的其他出版物相比,所提出的方法在检测视网膜疾病方面的成功率似乎达到99.48%,缩小了文献中的显着差距。与文献中的其他研究相比,所提出的方法具有保持低计算成本的优点。考虑到这些结论,我们注意到所建议的方法可以作为一种决策支持系统,在临床背景下协助医生诊断视网膜疾病。
{"title":"Detection of retinal diseases from ophthalmological images based on convolutional neural network architecture","authors":"Safiye Pelin Taş, Sezin Barın, Gür Emre Güraksın","doi":"10.4025/actascitechnol.v44i1.61181","DOIUrl":"https://doi.org/10.4025/actascitechnol.v44i1.61181","url":null,"abstract":"The retina is an eye layer that incorporates light- and color-sensitive cells as well as nerve fibers. It collects light and distributes it to the brain for image processing through the use of the optic nerve. Diseases that end up causing vision loss and blindness are generated by retinal ailments. As a result, it is imperative to diagnose and treat certain disorders as early as possible. Optical coherence tomography (OCT), an angiography imaging technique, is operated to help diagnose retinal disorders. Deep learning approaches, which are extensively utilized, have now become a convenient way for diagnosing retinal illnesses through OCT images as a result of their effective outcomes in interpreting medical images. To diagnose retinal disorders utilizing OCT scans, this investigation developed a hybrid methodology based on image pre-processing and convolutional neural networks (CNNs) (a deep learning method). Image pre-processing techniques including background filling, resizing, noise reduction, and highlighting are exercised at the pre-processing stage. The segmentation process provides a new CNN architecture with five convolution layers that does have a low computational cost. Compared to other publications using the same data set, the proposed method seems to have a success rate of 99.48 percent in the detection of retinal disorders, closing a significant gap in the literature. The proposed approach has the advantage of maintaining low computing costs in comparison to other studies in the literature. When the conclusions are regarded, it is noticed that the suggested method might be exerted as a decision support system to assist physicians in the clinical context during the diagnosis of retinal disorders.","PeriodicalId":7140,"journal":{"name":"Acta Scientiarum-technology","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2022-07-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81851965","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Influence of connection stiffness on static-dynamic behavior of steel frames 连接刚度对钢框架静动力性能的影响
IF 0.8 4区 综合性期刊 Q2 Mathematics Pub Date : 2022-07-28 DOI: 10.4025/actascitechnol.v44i1.60179
E. A. Bolandim, Renato Silva Nicoletti, A. Rossi, Alex Sander Clemente de Souza
The growing problems of excessive vibration in steel structures due to human rhythmic activities and vibrating machinery have led to the need for increasingly rigorous dynamic analysis in order to verify excessive displacements and ensure the users’ comfort. The present work aimed to carry out, via numerical simulation in ANSYS Mechanical APDL software, static, modal and harmonic analysis in steel frames with two floors and two bays in order to investigate the influence of the connection’s stiffness on the behavior of the structure. The results obtained showed that the natural frequency value of the models increases as the stiffness of the beam-column connections is increased. However, due to the harmonic analysis performed, it was not possible to delineate a behavior between the stiffness of the connections and the amplification.
由于人类有节奏的活动和振动机械引起的钢结构过度振动问题日益严重,因此需要越来越严格的动力分析,以验证过度位移并确保用户的舒适性。本工作旨在通过ANSYS机械APDL软件的数值模拟,对两层两隔板钢框架进行静力、模态和谐波分析,以研究连接刚度对结构性能的影响。计算结果表明,随着梁柱连接刚度的增大,模型的固有频率值增大。然而,由于进行了谐波分析,不可能描述连接刚度和放大之间的行为。
{"title":"Influence of connection stiffness on static-dynamic behavior of steel frames","authors":"E. A. Bolandim, Renato Silva Nicoletti, A. Rossi, Alex Sander Clemente de Souza","doi":"10.4025/actascitechnol.v44i1.60179","DOIUrl":"https://doi.org/10.4025/actascitechnol.v44i1.60179","url":null,"abstract":"The growing problems of excessive vibration in steel structures due to human rhythmic activities and vibrating machinery have led to the need for increasingly rigorous dynamic analysis in order to verify excessive displacements and ensure the users’ comfort. The present work aimed to carry out, via numerical simulation in ANSYS Mechanical APDL software, static, modal and harmonic analysis in steel frames with two floors and two bays in order to investigate the influence of the connection’s stiffness on the behavior of the structure. The results obtained showed that the natural frequency value of the models increases as the stiffness of the beam-column connections is increased. However, due to the harmonic analysis performed, it was not possible to delineate a behavior between the stiffness of the connections and the amplification.","PeriodicalId":7140,"journal":{"name":"Acta Scientiarum-technology","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2022-07-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86670942","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Stress-strain analysis of the tow hook of a commercial truck by numerical simulations 某商用卡车牵引钩应力-应变数值模拟分析
IF 0.8 4区 综合性期刊 Q2 Mathematics Pub Date : 2022-07-28 DOI: 10.4025/actascitechnol.v44i1.60577
Alexandre Assis Rezende Santos, Leomar Santos Marques, M.V.T. de Moura, Ricardo Rodrigues Magalhães
Numerical simulations have been widely used in the industry, although with some limitations. One of these limitations is the fact that the thermal effects derived from component manufacturing processes are normally disregarded in the analysis. Thus, the main goal of this study is to evaluate strains near the weld beads of a geometric model for a truck tow hook using numerical simulations by finite element method, considering thermal loads applied before the field loading. To validate the simulation results, an experiment was performed using a tow hook found in a commercial truck. Strain gauge rosettes were placed on the body base plate, and a load of 181.050 N was applied to the hook. This loading was the result of a commercial truck being pulled on level terrain, simulating a normal operation condition of the tow hook. The Von Mises stress found in simulations was approximately 302.23 MPa at the same position where the strain gauges were glued, when the load was applied. The difference between the simulated and experimental values of the equivalent specific strains in the area of the weld beads was 19.2%, and the difference between the permanent displacement values, resulting from plastic strain, in the X-direction was 0.1%. These results justify conducting new studies involving numerical simulations and considering thermal effects on static and dynamic loads in the automotive industry.
数值模拟已广泛应用于工业,尽管有一些局限性。这些限制之一是,在分析中通常忽略了来自组件制造过程的热效应。因此,本研究的主要目标是在考虑现场加载前施加的热载荷的情况下,利用有限元方法对卡车拖钩几何模型焊缝珠附近的应变进行数值模拟。为了验证仿真结果,使用商用卡车上发现的拖钩进行了实验。将应变计花环放置在钩体底板上,并对钩施加181.050 N的载荷。这种装载是一辆商用卡车在水平地形上被拉的结果,模拟了牵引钩的正常操作条件。当施加载荷时,在粘贴应变片的相同位置,模拟发现Von Mises应力约为302.23 MPa。焊珠区域等效比应变的模拟值与实验值的差异为19.2%,x方向上由塑性应变引起的永久位移值的差异为0.1%。这些结果证明了在汽车工业中开展涉及数值模拟和考虑静态和动态负载热效应的新研究是合理的。
{"title":"Stress-strain analysis of the tow hook of a commercial truck by numerical simulations","authors":"Alexandre Assis Rezende Santos, Leomar Santos Marques, M.V.T. de Moura, Ricardo Rodrigues Magalhães","doi":"10.4025/actascitechnol.v44i1.60577","DOIUrl":"https://doi.org/10.4025/actascitechnol.v44i1.60577","url":null,"abstract":"Numerical simulations have been widely used in the industry, although with some limitations. One of these limitations is the fact that the thermal effects derived from component manufacturing processes are normally disregarded in the analysis. Thus, the main goal of this study is to evaluate strains near the weld beads of a geometric model for a truck tow hook using numerical simulations by finite element method, considering thermal loads applied before the field loading. To validate the simulation results, an experiment was performed using a tow hook found in a commercial truck. Strain gauge rosettes were placed on the body base plate, and a load of 181.050 N was applied to the hook. This loading was the result of a commercial truck being pulled on level terrain, simulating a normal operation condition of the tow hook. The Von Mises stress found in simulations was approximately 302.23 MPa at the same position where the strain gauges were glued, when the load was applied. The difference between the simulated and experimental values of the equivalent specific strains in the area of the weld beads was 19.2%, and the difference between the permanent displacement values, resulting from plastic strain, in the X-direction was 0.1%. These results justify conducting new studies involving numerical simulations and considering thermal effects on static and dynamic loads in the automotive industry.","PeriodicalId":7140,"journal":{"name":"Acta Scientiarum-technology","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2022-07-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73205647","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Structure and share of satellite TV channels and DTH platforms in Europe 欧洲卫星电视频道和DTH平台的结构和份额
IF 0.8 4区 综合性期刊 Q2 Mathematics Pub Date : 2022-07-28 DOI: 10.4025/actascitechnol.v44i1.59237
Krsto Jakšić, Ivana Milošević, B. Jaksic, Vladimir Maksimovic, J. Todorovic
This work deals with the structure of TV channels that are distributed from satellite positions where DTH platforms offer their services in European countries. The structure is being considered via service availability (FTA and PAY TV), resolution (SDTV, HDTV and UHDTV), standards of broadcasting (DVB-S and DVB-S2), satellites and satellite positions, as well as market share of leading satellite operators at European market through which DTH providers do their services to the ultimate users. We also represent the market of TV channel distribution through the number of household which use cable, satellite, terrestrial and IPTV. Collected data are represented as a table and graph for the period from 1996 to 2020.
这项工作涉及从卫星位置分布的电视频道的结构,其中DTH平台在欧洲国家提供服务。这种结构是通过服务可用性(FTA和付费电视)、分辨率(SDTV、HDTV和UHDTV)、广播标准(DVB-S和DVB-S2)、卫星和卫星位置、主要卫星运营商在欧洲市场的市场份额(DTH提供商通过这些市场向最终用户提供服务)来考虑的。我们还通过使用有线电视、卫星电视、地面电视和IPTV的家庭数量来代表电视频道分配市场。收集的数据以表格和图表的形式表示1996年至2020年期间的数据。
{"title":"Structure and share of satellite TV channels and DTH platforms in Europe","authors":"Krsto Jakšić, Ivana Milošević, B. Jaksic, Vladimir Maksimovic, J. Todorovic","doi":"10.4025/actascitechnol.v44i1.59237","DOIUrl":"https://doi.org/10.4025/actascitechnol.v44i1.59237","url":null,"abstract":"This work deals with the structure of TV channels that are distributed from satellite positions where DTH platforms offer their services in European countries. The structure is being considered via service availability (FTA and PAY TV), resolution (SDTV, HDTV and UHDTV), standards of broadcasting (DVB-S and DVB-S2), satellites and satellite positions, as well as market share of leading satellite operators at European market through which DTH providers do their services to the ultimate users. We also represent the market of TV channel distribution through the number of household which use cable, satellite, terrestrial and IPTV. Collected data are represented as a table and graph for the period from 1996 to 2020.","PeriodicalId":7140,"journal":{"name":"Acta Scientiarum-technology","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2022-07-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81671162","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Physiological response of the protective enzymatic mechanism of Pontederia parviflora Alexander caused by chromium absorption stress 铬吸收胁迫下庞德马保护酶机制的生理响应
IF 0.8 4区 综合性期刊 Q2 Mathematics Pub Date : 2022-07-28 DOI: 10.4025/actascitechnol.v44i1.59876
D. C. Souza, A. Martinez, A. Peron, S. Froehner
The use of plants to eliminate organic or inorganic compounds is one of the alternatives for environmental treatment, but to guarantee the efficiency of process is necessary to know the effects in plant metabolism. This study sought to evaluate the enzymatic mechanism involved in the protection of the metabolism of Pontederia parviflora Alexander caused chromium absorption stress. The experiment was carried with solution of chromium (III) in three concentrations (10, 50 and 100 ppm) in the period of four days and evaluations daily. The concentration of chromium in the solution influenced the form of storage of metal in the tissues of plants. In 24 hours, there was increase of glutathione in the root in 10ppm solution and in 50 and 100 ppm the accumulation of glutathione occurs in the stem, coinciding with the peak absorption metal (48 hours). The activity of the catalase was higher in the roots, the peroxidase showed higher activity at the 50 ppm concentration, and the guaiacol had similar activity to catalase. The tolerance of P. parviflora in response to chromium stress occur for complex mechanisms, phytohormone-producing as significantly regulated under Cr stress and the formation of phytoquelatins was in sync with the absorption of metal. Due to the tolerance shown by P. parviflora, it becomes important for the environmental treatment of contaminated water.
利用植物去除有机或无机化合物是环境处理的替代方法之一,但为了保证处理的效率,有必要了解其在植物代谢中的作用。本研究旨在探讨微花庞德马(Pontederia parviflora Alexander)代谢引起的铬吸收胁迫的酶保护机制。实验采用10、50和100 ppm三种浓度的铬(III)溶液进行,为期4天,每天进行评估。溶液中铬的浓度影响金属在植物组织中的储存形式。在10ppm溶液中,24小时根中谷胱甘肽含量增加,在50和100 ppm溶液中,茎中谷胱甘肽积累发生,与吸收金属的峰值(48小时)一致。根中过氧化氢酶活性较高,过氧化物酶在50ppm浓度下活性较高,愈创木酚与过氧化氢酶活性相近。细小假单胞菌对铬胁迫的耐受机制复杂,铬胁迫下植物激素的产生受到显著调控,植物凝胶蛋白的形成与金属的吸收同步。由于细小假单胞菌表现出的耐受性,其在污染水体的环境处理中具有重要意义。
{"title":"Physiological response of the protective enzymatic mechanism of Pontederia parviflora Alexander caused by chromium absorption stress","authors":"D. C. Souza, A. Martinez, A. Peron, S. Froehner","doi":"10.4025/actascitechnol.v44i1.59876","DOIUrl":"https://doi.org/10.4025/actascitechnol.v44i1.59876","url":null,"abstract":"The use of plants to eliminate organic or inorganic compounds is one of the alternatives for environmental treatment, but to guarantee the efficiency of process is necessary to know the effects in plant metabolism. This study sought to evaluate the enzymatic mechanism involved in the protection of the metabolism of Pontederia parviflora Alexander caused chromium absorption stress. The experiment was carried with solution of chromium (III) in three concentrations (10, 50 and 100 ppm) in the period of four days and evaluations daily. The concentration of chromium in the solution influenced the form of storage of metal in the tissues of plants. In 24 hours, there was increase of glutathione in the root in 10ppm solution and in 50 and 100 ppm the accumulation of glutathione occurs in the stem, coinciding with the peak absorption metal (48 hours). The activity of the catalase was higher in the roots, the peroxidase showed higher activity at the 50 ppm concentration, and the guaiacol had similar activity to catalase. The tolerance of P. parviflora in response to chromium stress occur for complex mechanisms, phytohormone-producing as significantly regulated under Cr stress and the formation of phytoquelatins was in sync with the absorption of metal. Due to the tolerance shown by P. parviflora, it becomes important for the environmental treatment of contaminated water.","PeriodicalId":7140,"journal":{"name":"Acta Scientiarum-technology","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2022-07-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85569795","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Premature ventricular contraction recognition using blind source separation and ensemble gaussian naive bayes weighted by analytic hierarchy process 采用盲源分离和层次分析法加权的集合高斯朴素贝叶斯识别室性早搏
IF 0.8 4区 综合性期刊 Q2 Mathematics Pub Date : 2022-07-28 DOI: 10.4025/actascitechnol.v44i1.60386
B. R. Oliveira, M. A. Q. Duarte, J. Vieira Filho
Premature Ventricular Contractions (PVC) arrhythmias can be associated with sudden death and acute myocardial infarction, occurring in 50% of the population for Holter monitoring. PVC patterns are very hard to be recognized since their waveforms can be confused with other heartbeats, such as Right and Left Bundle Branch Blocks. This work proposes a new approach for PVC recognition, based on Gaussian Naive Bayes algorithm and AMUSE (Algorithm for Multiple Unknown Signal Extraction), which is a method for the blind source separation problem. This approach provides a set of attributes that are combined by Linear Discriminant Analysis, allowing the training of an ensemble learning. The Analytic Hierarchy Process weights each learned model according to its importance, obtained from the performance metrics. This approach has some advantages over baseline methods since it does not use a pre-processing stage and employs a simple machine learning model trained using only two parameters for each feature. Using a standard dataset for training and test phases, the proposed approach achieves 98.75% accuracy, 90.65% sensitivity, and 99.46% specificity. The best performance was 99.57% accuracy, 98.64% sensitivity, and 99.65% specificity for other datasets. In general, the proposed approach is better than 66% of the state-of-the-art methods concerning accuracy
室性早搏(PVC)心律失常可与猝死和急性心肌梗死相关,发生在50%的动态心电图监测人群中。PVC模式很难识别,因为它们的波形可能与其他心跳相混淆,例如右束和左束分支块。本文提出了一种基于高斯朴素贝叶斯算法和AMUSE (algorithm for Multiple Unknown Signal Extraction)的PVC识别新方法,该方法是一种针对盲源分离问题的方法。这种方法提供了一组由线性判别分析组合的属性,允许集成学习的训练。层次分析法根据从性能指标中得到的重要程度对每个学习模型进行加权。这种方法比基线方法有一些优点,因为它不使用预处理阶段,并且使用简单的机器学习模型,每个特征只使用两个参数进行训练。使用训练和测试阶段的标准数据集,该方法达到98.75%的准确率,90.65%的灵敏度和99.46%的特异性。在其他数据集上,准确率为99.57%,灵敏度为98.64%,特异性为99.65%。总的来说,所提出的方法在准确性方面优于66%的最先进的方法
{"title":"Premature ventricular contraction recognition using blind source separation and ensemble gaussian naive bayes weighted by analytic hierarchy process","authors":"B. R. Oliveira, M. A. Q. Duarte, J. Vieira Filho","doi":"10.4025/actascitechnol.v44i1.60386","DOIUrl":"https://doi.org/10.4025/actascitechnol.v44i1.60386","url":null,"abstract":"Premature Ventricular Contractions (PVC) arrhythmias can be associated with sudden death and acute myocardial infarction, occurring in 50% of the population for Holter monitoring. PVC patterns are very hard to be recognized since their waveforms can be confused with other heartbeats, such as Right and Left Bundle Branch Blocks. This work proposes a new approach for PVC recognition, based on Gaussian Naive Bayes algorithm and AMUSE (Algorithm for Multiple Unknown Signal Extraction), which is a method for the blind source separation problem. This approach provides a set of attributes that are combined by Linear Discriminant Analysis, allowing the training of an ensemble learning. The Analytic Hierarchy Process weights each learned model according to its importance, obtained from the performance metrics. This approach has some advantages over baseline methods since it does not use a pre-processing stage and employs a simple machine learning model trained using only two parameters for each feature. Using a standard dataset for training and test phases, the proposed approach achieves 98.75% accuracy, 90.65% sensitivity, and 99.46% specificity. The best performance was 99.57% accuracy, 98.64% sensitivity, and 99.65% specificity for other datasets. In general, the proposed approach is better than 66% of the state-of-the-art methods concerning accuracy","PeriodicalId":7140,"journal":{"name":"Acta Scientiarum-technology","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2022-07-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72393569","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
期刊
Acta Scientiarum-technology
全部 Acc. Chem. Res. ACS Applied Bio Materials ACS Appl. Electron. Mater. ACS Appl. Energy Mater. ACS Appl. Mater. Interfaces ACS Appl. Nano Mater. ACS Appl. Polym. Mater. ACS BIOMATER-SCI ENG ACS Catal. ACS Cent. Sci. ACS Chem. Biol. ACS Chemical Health & Safety ACS Chem. Neurosci. ACS Comb. Sci. ACS Earth Space Chem. ACS Energy Lett. ACS Infect. Dis. ACS Macro Lett. ACS Mater. Lett. ACS Med. Chem. Lett. ACS Nano ACS Omega ACS Photonics ACS Sens. ACS Sustainable Chem. Eng. ACS Synth. Biol. Anal. Chem. BIOCHEMISTRY-US Bioconjugate Chem. BIOMACROMOLECULES Chem. Res. Toxicol. Chem. Rev. Chem. Mater. CRYST GROWTH DES ENERG FUEL Environ. Sci. Technol. Environ. Sci. Technol. Lett. Eur. J. Inorg. Chem. IND ENG CHEM RES Inorg. Chem. J. Agric. Food. Chem. J. Chem. Eng. Data J. Chem. Educ. J. Chem. Inf. Model. J. Chem. Theory Comput. J. Med. Chem. J. Nat. Prod. J PROTEOME RES J. Am. Chem. Soc. LANGMUIR MACROMOLECULES Mol. Pharmaceutics Nano Lett. Org. Lett. ORG PROCESS RES DEV ORGANOMETALLICS J. Org. Chem. J. Phys. Chem. J. Phys. Chem. A J. Phys. Chem. B J. Phys. Chem. C J. Phys. Chem. Lett. Analyst Anal. Methods Biomater. Sci. Catal. Sci. Technol. Chem. Commun. Chem. Soc. Rev. CHEM EDUC RES PRACT CRYSTENGCOMM Dalton Trans. Energy Environ. Sci. ENVIRON SCI-NANO ENVIRON SCI-PROC IMP ENVIRON SCI-WAT RES Faraday Discuss. Food Funct. Green Chem. Inorg. Chem. Front. Integr. Biol. J. Anal. At. Spectrom. J. Mater. Chem. A J. Mater. Chem. B J. Mater. Chem. C Lab Chip Mater. Chem. Front. Mater. Horiz. MEDCHEMCOMM Metallomics Mol. Biosyst. Mol. Syst. Des. Eng. Nanoscale Nanoscale Horiz. Nat. Prod. Rep. New J. Chem. Org. Biomol. Chem. Org. Chem. Front. PHOTOCH PHOTOBIO SCI PCCP Polym. Chem.
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
0
微信
客服QQ
Book学术公众号 扫码关注我们
反馈
×
意见反馈
请填写您的意见或建议
请填写您的手机或邮箱
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
现在去查看 取消
×
提示
确定
Book学术官方微信
Book学术文献互助
Book学术文献互助群
群 号:481959085
Book学术
文献互助 智能选刊 最新文献 互助须知 联系我们:info@booksci.cn
Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。
Copyright © 2023 Book学术 All rights reserved.
ghs 京公网安备 11010802042870号 京ICP备2023020795号-1