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New Frequency Reconfigurable Patch Antenna for Wireless Communication 用于无线通信的新型频率可重构贴片天线
Sanaa Errahili, Asma Khabba, S. Ibnyaich, M. Hassani
In this paper, a new frequency reconfigurable patch antenna is proposed. The planned antenna is designed on the dielectric substrate of FR4-epoxy with 4.4 relative permittivity, with a compact volume of 25 × 21 × 1.67mm3. The proposed antenna is formed of a Positive Intrinsic Negative diode (PIN diode), placed at the radiating patch to achieve frequency reconfigurability. Based on the switching state of the PIN diode, the antenna is capable of operating at two different frequency ranges. The simulation of the proposed antenna is implemented using CST microwave studio, it was re-simulated in Ansys HFSS software to confirm the results obtained. The performance of the antenna is analysed from the reflection coefficient, the voltage standing wave ratio(VSWR), the surface current distribution and the radiation pattern. The antenna has two resonant frequencies: 3.44 GHz (Worldwide Interoperability for Microwave Access (WiMAX)) and 5.26 GHz (Wireless Local Area Network (WLAN)).
本文提出了一种新的频率可重构贴片天线。天线设计在相对介电常数为4.4的fr4 -环氧树脂介质基板上,体积紧凑,为25 × 21 × 1.67mm3。所提出的天线由一个正固有负二极管(PIN二极管)组成,放置在辐射贴片上以实现频率可重构性。基于PIN二极管的开关状态,天线能够在两个不同的频率范围内工作。利用CST微波工作室对天线进行了仿真,并在Ansys HFSS软件中进行了二次仿真,验证了仿真结果。从反射系数、电压驻波比、表面电流分布和辐射方向图等方面分析了天线的性能。天线有两个谐振频率:3.44 GHz(全球微波接入互操作性(WiMAX))和5.26 GHz(无线局域网(WLAN))。
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引用次数: 1
Motion Detection Using the Dynamic Color Texture 使用动态颜色纹理的运动检测
I. Bellamine, H. Silkan, A. Tmiri
Color interest point detection is an important research area in the field of image processing and computer vision. In general, the use of color increases the distinctiveness of interest points. In this article we propose to extend the detection of the color interest point to the temporal aspect. For color sequences, we propose an extension version of the Color interest point detector to detect what they call "Color Space- Time Interest Points detector" (CSTIP). To increase the robustness of CSTIP features extraction, we suggest a pre-processing step which is based on a dynamic decomposition model and can decomposes the video into the dynamic color texture component and the dynamic color structure component. We compute the new Color Space Time Interest Points (CSTIP) associated to the dynamic color texture (DCT) components by using the proposed algorithm of the detection of Color Space- Time Interest Points. Experimental results are obtained from very different types of videos, namely sport videos and animation movies.
色彩兴趣点检测是图像处理和计算机视觉领域的一个重要研究方向。一般来说,色彩的使用增加了兴趣点的独特性。在本文中,我们提出将颜色兴趣点的检测扩展到时间方面。对于颜色序列,我们提出了一个扩展版本的颜色兴趣点检测器来检测他们所谓的“颜色时空兴趣点检测器”(CSTIP)。为了提高CSTIP特征提取的鲁棒性,我们提出了一种基于动态分解模型的预处理步骤,可以将视频分解为动态颜色纹理分量和动态颜色结构分量。利用所提出的颜色时空兴趣点检测算法,计算与动态颜色纹理(DCT)分量相关联的新的颜色时空兴趣点(CSTIP)。实验结果来自非常不同类型的视频,即体育视频和动画电影。
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引用次数: 0
Role of Information Technologies in Supply Chain Management 信息技术在供应链管理中的作用
Heddoun Asmae, Benrrezzouq Rhizlane
Logistics Information Technology (LIC) is a key enabler of effective supply chain management activities. In 2015, $300 billion was spent on LIC by businesses worldwide, an increase of 1.8% and 3.8% over 2016 and 2017, respectively. With such large investments, companies run the risk of deteriorating financial performance if the (LIC) does not work as expected. In fact, there is a mix of evidence, some companies benefiting from the (LIC) while others do not benefit from the investment in the LIC. Despite substantial research on the use of information technology in a Supply Chain Management context, the impact of the LIC on business performance is unclear. In particular, the existing literature has reported conflicting results regarding the relationship between the LIC and the company's performance. Therefore, the purpose of our article is to investigate the roles of information technologies in SCM and to highlight this extremely important area of research. We find that the LIC is not universally associated with improving the performance of the company. In particular, LIC has several characteristics, and each characteristic is related to different performance indicators.
物流信息技术(LIC)是有效供应链管理活动的关键推动者。2015年,全球企业在LIC上的支出为3000亿美元,分别比2016年和2017年增长1.8%和3.8%。如此大规模的投资,如果(LIC)不像预期的那样发挥作用,公司就会面临财务业绩恶化的风险。事实上,有多种证据表明,一些公司从(LIC)中受益,而另一些公司则没有从投资LIC中受益。尽管在供应链管理背景下对信息技术的使用进行了大量研究,但LIC对业务绩效的影响尚不清楚。特别是,现有文献报告了关于LIC与公司绩效之间关系的相互矛盾的结果。因此,本文的目的是研究信息技术在供应链管理中的作用,并强调这一极其重要的研究领域。我们发现,LIC并不普遍与公司绩效的改善有关。特别是,LIC具有几个特征,每个特征都与不同的性能指标相关。
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引用次数: 0
Inferring SQL Queries Using Interactivity 使用交互性推断SQL查询
K. Ahkouk, M. Machkour, J. Antari
Interactivity in language processing plays a pivotal role to allow models to better understand how to build the appropriate output. In the task of Natural Language to SQL, the fact of including the users' interactivity can be one of the practical solutions that haven't been studied deeply in the existing works published in the last decade. Using databases by users with limited familiarity in SQL will create an additional obstacle for these users to better exploit the content stored in the database systems. In this paper we present the already published studies and we discuss the utility of using the interactivity to definitely improve the query generation process in order to construct a model that generalize for unseen and complex sentences and to automatically generate the appropriate outputs.
语言处理中的交互性在使模型更好地理解如何构建适当的输出方面起着关键作用。在从自然语言到SQL的任务中,包含用户交互性的事实可能是过去十年出版的现有作品中没有深入研究的实际解决方案之一。对SQL不太熟悉的用户使用数据库会给这些用户更好地利用数据库系统中存储的内容带来额外的障碍。在本文中,我们介绍了已经发表的研究,并讨论了使用交互性来明确改进查询生成过程的效用,以便构建一个模型,该模型可以泛化未见过的和复杂的句子,并自动生成适当的输出。
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引用次数: 1
Towards analyzing crash events for novice drivers under reduced-visibility settings: A simulator study 在低能见度环境下对新手驾驶员碰撞事件的分析:模拟器研究
Z. E. A. Elassad, H. Mousannif, H. A. Moatassime
Road accidents are one of the primary concerns and critical issues that encounters societies nowadays: Crash events analysis is a key role in improving traffic safety and reducing potential inconveniences to road users. As such, novice drivers continue to be overrepresented in fatalities and injuries arising from crashes, especially in those that occur during nigh times under rainy weather conditions. In this study, we aim to investigate road crash events for novice drivers under reduced-visibility scenarios during multiple night-time driving simulations that have been conducted using a desktop driving simulator. This paper depicted the effect of both light rain and heavy rain on traffic safety by endorsing real-time driver inputs established as throttle pedal position, brake pedal position and wheel angle. To the authors' knowledge, minimal work has been directed to the examination of light and heavy rain on novice drivers crash events based on driver inputs during night times. Artificial Neural Networks (ANN) and Decision Trees (DT) machine learning models have been developed to analyze crash events; results depict that ANN model exhibited the best performances in terms of accuracy and AUC measures during all-weather covariates. Conventionally, and based on the findings, new insights into night-related crash events' assessments for novice drivers could be harnessed to assist enforcement endeavors to design crash avoidance/warning systems under reduced-visibility settings.
道路交通事故是当今社会面临的主要关注和关键问题之一:碰撞事件分析在提高交通安全和减少道路使用者的潜在不便方面发挥着关键作用。因此,在交通事故造成的伤亡中,新手司机的比例仍然过高,特别是在夜间雨天发生的交通事故中。在这项研究中,我们的目的是调查新手驾驶员在夜间驾驶模拟中使用桌面驾驶模拟器进行的低能见度场景下的道路碰撞事件。本文通过认可油门踏板位置、刹车踏板位置和车轮角度等驾驶员实时输入,描述了小雨和大雨对交通安全的影响。据作者所知,根据驾驶员在夜间的输入,对小雨和大雨对新手驾驶员碰撞事件的影响进行了最少的研究。人工神经网络(ANN)和决策树(DT)机器学习模型已被开发用于分析碰撞事件;结果表明,在全天候协变量中,ANN模型在精度和AUC度量方面表现出最好的性能。通常情况下,根据研究结果,可以利用对新手驾驶员夜间相关碰撞事件评估的新见解,协助执法部门在能见度降低的情况下设计碰撞避免/警告系统。
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引用次数: 3
A machine learning color-based segmentation for object detection within dual X-ray baggage images 一种用于双x射线行李图像中物体检测的基于颜色的机器学习分割方法
Mohamed Chouai, M. Merah, J. Sancho-Gómez, M. Mimi
Billions of suitcases and other belongings are checked every year in the X-ray systems of airports around the world. This process is of great importance because it involves the detection of possible dangerous objects such as weapons or explosives. However, the work done by airport surveillance personnel is not free from errors usually due to tiredness or distractions. This is a security problem that can always be reduced with the help of automatic intelligent tools. This paper proposes a machine learning (ML) application for image segmentation. First, it is used a color-based pixel segmentation of images to separate organic, inorganic, mixed and opaque objects from the background. Second, those five types of images are reduced in the so-called fusion phase and classified into only two: organic and inorganic. A comparative study of several ML algorithms with heuristics over a large data set of X-ray images is presented for the classification of organic and inorganic objects for a future dangerous object detection work.
每年,世界各地机场的x光系统都会检查数十亿件行李箱和其他物品。这一过程非常重要,因为它涉及探测可能的危险物体,如武器或爆炸物。然而,机场监视人员所做的工作也不是没有错误的,通常是由于疲劳或分心。这是一个安全问题,总是可以在自动智能工具的帮助下减少。本文提出了一种用于图像分割的机器学习应用。首先,使用基于颜色的图像像素分割,将有机、无机、混合和不透明物体从背景中分离出来。其次,这五种类型的图像在所谓的融合阶段被简化,并分为两种:有机和无机。在x射线图像的大数据集上,对几种具有启发式算法的ML算法进行了比较研究,为未来的危险物体检测工作提供了有机和无机物体的分类。
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引用次数: 3
Post-Fall Time Accounting for Fall Detection Using a Portable Camera 使用便携式相机进行跌落检测后的时间核算
Isma Boudouane, Amina Makhlouf, M. Harkat, N. Saadia, A. Ramdane-Cherif
Falls are one the major problems that threatens the health of the elderly. For this reason, many devices have been developed by researchers all around the globe to continuously monitor and detect critical events, like falls, which allow for a fast-medical intervention to take place. The proposed method for the detection of fall is based on the original version of the Histogram of Oriented Gradient (HOG) combined with Optical Flow and immobilization time to reduce the numbers of false detections. The method was implemented in a system composed of a portable camera and an embedded multi-core computer (Raspberry Pi) to parallelize computations which allows for real time detection. The results of 45 tests conducted on 09 subjects show that falls from standing position can be detected with 80% of sensitivity. The inclusion of immobilization time in the detection process improves the specificity for rotations by 14%.
跌倒是威胁老年人健康的主要问题之一。出于这个原因,世界各地的研究人员开发了许多设备来持续监测和检测关键事件,如跌倒,从而可以进行快速的医疗干预。本文提出的跌倒检测方法是基于原始版本的定向梯度直方图(HOG),结合光流和固定时间来减少误检次数。该方法在一个由便携式相机和嵌入式多核计算机(树莓派)组成的系统中实现,以并行计算,从而实现实时检测。对09名受试者进行的45项测试结果表明,从站立位置跌落的检测灵敏度为80%。在检测过程中纳入固定时间可使旋转特异性提高14%。
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引用次数: 1
Modelling Sustainability, Cloud computing and knowledge transmission in education in developing countries 发展中国家教育中的可持续性、云计算和知识传播建模
A. Mehrez, L. Aladel
This paper focuses on presenting a conceptual model in order to integrate sustainability in cloud computing resulting in facilitating transmission of knowledge in education with a focus on developing countries. From one perspective and while cloud computing has been considered as a recent area of research due to arguments round its value to organizational performance, sustainability has turned to be a typical common norm due to the discovery of uncertainty in various human aspects. From a different perspective, the role of Knowledge Management in enhancing organisational success has been detected in different researches. The main consensus after these researches is that the more effective management of knowledge is the more effective the organizational performance will be. Therefore, this paper presents a theoretical framework of potential links among cloud computing, knowledge management and sustainability.
本文重点介绍了一个概念模型,以便将可持续性纳入云计算,从而促进教育中的知识传播,重点是发展中国家。从一个角度来看,虽然云计算因其对组织绩效的价值而被认为是一个最近的研究领域,但由于发现了人类各个方面的不确定性,可持续性已成为一种典型的共同规范。从不同的角度来看,不同的研究发现了知识管理在提高组织成功方面的作用。这些研究的主要共识是知识管理越有效,组织绩效越有效。因此,本文提出了云计算、知识管理和可持续性之间潜在联系的理论框架。
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引用次数: 0
Proposal of the Solution of Virtual Basic Schools in Rural Areas of African Countries in Conflict: Case of the Central African Republic 非洲冲突国家农村地区虚拟基础学校的解决方案——以中非共和国为例
G. M. Kossingou, Nadege Gladys Ndassimba, Edgard Ndassimba, Kéba Gueye, S. Ouya
The repeated political-military crises from 1996 to the present have disrupted the education system in CAR. The quantitative and qualitative level of primary and secondary schools in CAR is currently very low compared to the periods before the crisis. Several school facilities in rural areas have been destroyed and qualified basic 1 and 2 teachers are abandoning rural areas at risk occupied by rebels. For more than 15 years now, many primary and secondary school children in high-risk areas have not had access to school. As a direct result, the illiteracy rate and child soldiers in the rebellion are rising. This article proposes the use of the Moodle platform that is an open source platform, with many activity modules. These activities allow interaction between teachers and learners at a distance. The implementation of this e-learning platform is a solution for children and young people who have not been to school for a short or long time.It allows: • Catch-up training in primary school for children who have been out of school for a period of less than or equal to 5 years; • Catch-up courses at secondary school for young people who have been out of school for 5 years or less; • Training in agriculture, animal husbandry and fishing will be offered to young people who can no longer resume their studies; • This solution makes it possible to reduce the illiteracy rate among young people and to improve living conditions in the rural areas of countries in conflict.
从1996年到现在,反复出现的政治军事危机扰乱了中非共和国的教育体系。与危机前相比,中非共和国中小学目前的数量和质量水平都很低。农村地区的几所学校设施遭到破坏,合格的基础1和基础2教师正在放弃被叛乱分子占领的危险农村地区。15年多来,高风险地区的许多中小学生没有机会上学。其直接结果是,叛乱中的文盲率和儿童兵正在上升。本文建议使用Moodle平台,它是一个开源平台,具有许多活动模块。这些活动允许教师和学习者之间进行远距离互动。这个电子学习平台的实施是为那些短时间或长时间没有上学的儿童和年轻人提供的一个解决方案。它允许:•为失学时间少于或等于5年的儿童提供小学补习培训;•为离校5年或更短时间的年轻人提供中学补习班;•将向无法继续学业的年轻人提供农业、畜牧业和渔业方面的培训;•这一解决方案可以降低年轻人的文盲率,并改善冲突国家农村地区的生活条件。
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引用次数: 2
Fuzzy Systems for Computational Linguistics and Natural Language 计算语言学和自然语言的模糊系统
D. Bystrov, Olimjon Toirov, Mustafakulova Gulzoda, Yakubova Dilfuza
A natural language (NL) is any of the languages naturally used by humans, i.e. not an artificial such as programming languages. Natural language generation systems convert information from computer databases into normal-sounding human language and natural language understanding systems convert samples of human language into more formal representations that are easier for computer programs to manipulate. Natural language is basically a system for describing perceptions. In this paper we discuss use of fuzzy logic in natural language processing and computation, the general process of NLP as well as some common techniques used, computational linguistic, linguistic approximation.
自然语言(NL)是人类自然使用的任何语言,即不是人工的,如编程语言。自然语言生成系统将计算机数据库中的信息转换为听起来正常的人类语言,自然语言理解系统将人类语言样本转换为更易于计算机程序操作的更正式的表示。自然语言基本上是一个描述感知的系统。本文讨论了模糊逻辑在自然语言处理和计算中的应用,自然语言处理的一般过程以及一些常用的技术,计算语言学,语言近似。
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引用次数: 12
期刊
Proceedings of the 3rd International Conference on Networking, Information Systems & Security
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