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Loss Process at an AQM Buffer AQM缓冲区的损耗过程
IF 3.5 Q2 COMPUTER SCIENCE, INFORMATION SYSTEMS Pub Date : 2023-07-10 DOI: 10.3390/jsan12040055
A. Chydzinski
We perform a comprehensive analysis of packet losses occurring at an AQM buffer in which the packet deletion probability is relative to the size of the queue. Several characteristics of the loss process are derived: the number of deletions in an interval of length t, the temporary intensity of deletions at arbitrary time, the steady-state loss ratio, and the number of losses if there is no service. All of them are obtained for a general deletion probability function and an advanced model of the arrival process, which incorporates, among other things, the autocorrelation of traffic. Analytical results are accompanied by examples in which numerical values are obtained for several configurations of the system. Using these examples, the dependence of the loss process on the initial system state, deletion probability function, and traffic autocorrelation are discussed.
我们对发生在AQM缓冲区的数据包丢失进行了全面的分析,其中数据包删除概率与队列的大小有关。导出了损耗过程的几个特征:长度为t的区间内的损耗次数、任意时间内的暂时损耗强度、稳态损耗比以及无服务时的损耗次数。所有这些都是由一个通用的删除概率函数和一个先进的到达过程模型得到的,其中包括流量的自相关。分析结果附有实例,其中对系统的几种构型进行了数值计算。通过这些例子,讨论了丢失过程对系统初始状态、删除概率函数和流量自相关的依赖关系。
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引用次数: 0
Low-Cost Real-Time Locating System Solution Development and Implementation in Manufacturing Industry 制造业低成本实时定位系统解决方案的开发与实现
IF 3.5 Q2 COMPUTER SCIENCE, INFORMATION SYSTEMS Pub Date : 2023-07-10 DOI: 10.3390/jsan12040054
Andrea Volpi, R. Montanari, L. Tebaldi, Marco Mambrioni
The present work originates from a previous study in which a low-cost Real-Time Locating System (RTLS) based on Ultra-Wideband signals was developed and tested both in a laboratory and in a real industrial environment for assessing its performance and determining the best configuration, according to some selected KPIs. Starting from the future research directions depicted, the evolution herein presented is twofold. First, tests performed in the laboratory are refined and deepened in terms of (i) different anchors’ arrangements and orientation; (ii) the increased number of tested tags; and (iii) the tags’ battery capacity test. Second, the development and deployment of the industrial solution as well is improved by means of a case for hosting tags to be positioned on the asset to be tracked, realized through 3D printing, in line with the industrial context requirements. Finally, an economic analysis is performed so as to demonstrate the convenience of the investment and the feasibility of the solution. Results are positive and promising in terms of both economic sustainability and implementation of the system in a real industrial environment and may constitute guidelines for practitioners and managers.
本工作源于之前的一项研究,在该研究中,根据一些选定的KPI,开发了一种基于超宽带信号的低成本实时定位系统(RTLS),并在实验室和实际工业环境中进行了测试,以评估其性能并确定最佳配置。从未来的研究方向出发,本文提出了两个方面的发展。首先,在实验室进行的测试在(i)不同锚的布置和方向方面得到了改进和深化;(ii)测试标签的数量增加;以及(iii)标签的电池容量测试。其次,工业解决方案的开发和部署也通过将标签放置在要跟踪的资产上的案例得到了改进,该案例通过3D打印实现,符合工业环境要求。最后进行了经济分析,论证了投资的便利性和解决方案的可行性。就经济可持续性和在实际工业环境中实施该系统而言,结果是积极和有希望的,可能成为从业者和管理者的指导方针。
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引用次数: 0
Sensorless Estimation of Human Joint Torque for Robust Tracking Control of Lower-Limb Exoskeleton Assistive Gait Rehabilitation 人体关节力矩的无传感器估计用于下肢外骨骼辅助步态康复的鲁棒跟踪控制
IF 3.5 Q2 COMPUTER SCIENCE, INFORMATION SYSTEMS Pub Date : 2023-07-07 DOI: 10.3390/jsan12040053
A. Abdullahi, R. Chaichaowarat
Patients suffering from motor disorders or weakness resulting from either serious spinal cord injury or stroke often require rehabilitation therapy to regain their mobility. In the lower limbs, exoskeletons have two motors aligned with the patients’ hip and knee to assist in rehabilitation exercises by supporting the patient’s body structure to increase the torques at the hip and knee joints. Assistive rehabilitation is, however, challenging, as the human torque is unknown and varies from patient to patient. This poses difficulties in determining the level of assistance required for a particular patient. In this paper, therefore, a modified extended state observer (ESO)-based integral sliding mode (ISM) controller (MESOISMC) for lower-limb exoskeleton assistive gait rehabilitation is proposed. The ESO is used to estimate the unknown human torque without application of a torque sensor while the ISMC is used to achieve robust tracking of preset hip and knee joint angles by considering the estimated human torque as a disturbance. The performance of the proposed MESOISMC was assessed using the mean absolute error (MAE). The obtained results show an 85.02% and 87.38% reduction in the MAE for the hip and joint angles, respectively, when the proposed MESOISMC is compared with ISMC with both controllers tuned via LMI optimization. The results also indicate that the proposed MESOISMC method is effective and efficient for user comfort and safety during gait rehabilitation training.
严重脊髓损伤或中风导致运动障碍或虚弱的患者通常需要康复治疗以恢复其活动能力。在下肢,外骨骼有两个与患者髋关节和膝关节对齐的马达,通过支持患者的身体结构来增加髋关节和膝关节的扭矩,以辅助康复锻炼。然而,辅助康复具有挑战性,因为人的扭矩是未知的,并且因人而异。这给确定特定病人所需的援助水平带来了困难。因此,本文提出了一种基于改进扩展状态观测器(ESO)的下肢外骨骼辅助步态康复积分滑模(ISM)控制器(MESOISMC)。ESO用于在不使用扭矩传感器的情况下估计未知的人体扭矩,ISMC用于将估计的人体扭矩作为干扰来实现对预设髋关节和膝关节角度的鲁棒跟踪。使用平均绝对误差(MAE)评估所提出的MESOISMC的性能。结果表明,与两种控制器均经过LMI优化的ISMC相比,所提出的MESOISMC对髋关节和关节角度的MAE分别降低了85.02%和87.38%。结果还表明,MESOISMC方法在步态康复训练中对用户的舒适性和安全性是有效和高效的。
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引用次数: 2
DDoS Attack and Detection Methods in Internet-Enabled Networks: Concept, Research Perspectives, and Challenges 互联网网络中的DDoS攻击和检测方法:概念、研究前景和挑战
IF 3.5 Q2 COMPUTER SCIENCE, INFORMATION SYSTEMS Pub Date : 2023-07-06 DOI: 10.3390/jsan12040051
K. Adedeji, A. Abu-Mahfouz, A. Kurien
In recent times, distributed denial of service (DDoS) has been one of the most prevalent security threats in internet-enabled networks, with many internet of things (IoT) devices having been exploited to carry out attacks. Due to their inherent security flaws, the attacks seek to deplete the resources of the target network by flooding it with numerous spoofed requests from a distributed system. Research studies have demonstrated that a DDoS attack has a considerable impact on the target network resources and can result in an extended operational outage if not detected. The detection of DDoS attacks has been approached using a variety of methods. In this paper, a comprehensive survey of the methods used for DDoS attack detection on selected internet-enabled networks is presented. This survey aimed to provide a concise introductory reference for early researchers in the development and application of attack detection methodologies in IoT-based applications. Unlike other studies, a wide variety of methods, ranging from the traditional methods to machine and deep learning methods, were covered. These methods were classified based on their nature of operation, investigated as to their strengths and weaknesses, and then examined via several research studies which made use of each approach. In addition, attack scenarios and detection studies in emerging networks such as the internet of drones, routing protocol based IoT, and named data networking were also covered. Furthermore, technical challenges in each research study were identified. Finally, some remarks for enhancing the research studies were provided, and potential directions for future research were highlighted.
近年来,分布式拒绝服务(DDoS)一直是互联网网络中最普遍的安全威胁之一,许多物联网(IoT)设备被用来进行攻击。由于其固有的安全缺陷,这些攻击试图通过从分布式系统向目标网络发送大量伪造请求来耗尽目标网络的资源。研究表明,DDoS攻击对目标网络资源有相当大的影响,如果没有检测到,可能会导致长期运营中断。DDoS攻击的检测方法多种多样。本文全面介绍了在选定的启用互联网的网络上进行DDoS攻击检测的方法。本调查旨在为早期研究人员在基于物联网的应用中开发和应用攻击检测方法提供简明的介绍性参考。与其他研究不同,涵盖了从传统方法到机器和深度学习方法的各种方法。这些方法根据其操作性质进行分类,调查其优缺点,然后通过使用每种方法的几项研究进行检查。此外,还涵盖了新兴网络中的攻击场景和检测研究,如无人机互联网、基于路由协议的物联网和命名数据网络。此外,还确定了每项研究中的技术挑战。最后,对加强研究提出了一些意见,并强调了未来研究的潜在方向。
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引用次数: 1
Recent Advances in Time-Sensitive Network Configuration Management: A Literature Review 时间敏感网络配置管理的最新进展:文献综述
IF 3.5 Q2 COMPUTER SCIENCE, INFORMATION SYSTEMS Pub Date : 2023-07-06 DOI: 10.3390/jsan12040052
Boxin Shi, Xiaodong Tu, Bin Wu, Yifei Peng
At present, many network applications are seeking to implement Time-Sensitive Network (TSN) technology, which not only furnishes communication transmission services that are deterministic, low-latency, highly dependable, and have ample bandwidth, but also enables unified configuration management, permitting different network types to function under a single management system. These characteristics enable it to be widely used in many fields such as industrial sensor and actuator networks, in-vehicle networks, data center networks, and edge computing. Nonetheless, TSN’s configuration management faces numerous difficulties and challenges related to network deployment, automated operation, and maintenance, as well as real-time and safety assurance, rendering it exceedingly intricate. In recent years, some studies have been conducted on TSN configuration management, encompassing various aspects such as system design, key technologies for configuration management, protocol enhancement, and application development. Nevertheless, there is a dearth of systematic summaries of these studies. Hence, this article aims to provide a comprehensive overview of TSN configuration management. Drawing upon more than 70 relevant publications and the pertinent standards established by the IEEE 802.1 TSN working group, we first introduce the system architecture of TSN configuration management from a macro perspective and then explore specific technical details. Additionally, we demonstrate its application scenarios through practical cases and finally highlight the challenges and future research directions. We aspire to provide a comprehensive reference for peers and new researchers interested in TSN configuration management.
目前,许多网络应用都在寻求实现时间敏感网络(TSN)技术,该技术不仅提供确定性、低延迟、高可靠性和充足带宽的通信传输服务,而且能够实现统一的配置管理,允许不同网络类型在同一管理系统下运行。这些特性使其能够广泛应用于许多领域,如工业传感器和执行器网络、车载网络、数据中心网络和边缘计算。尽管如此,TSN的配置管理面临着与网络部署、自动化操作和维护以及实时性和安全性保证相关的许多困难和挑战,使其变得极其复杂。近年来,人们对TSN配置管理进行了一些研究,涵盖了系统设计、配置管理的关键技术、协议增强和应用开发等多个方面。然而,对这些研究缺乏系统的总结。因此,本文旨在提供TSN配置管理的全面概述。借鉴70多篇相关出版物和IEEE 802.1 TSN工作组制定的相关标准,我们首先从宏观角度介绍了TSN配置管理的系统架构,然后探讨了具体的技术细节。此外,我们还通过实际案例展示了它的应用场景,最后强调了它的挑战和未来的研究方向。我们渴望为对TSN配置管理感兴趣的同行和新研究人员提供全面的参考。
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引用次数: 0
On Wireless Sensor Network Models: A Cross-Layer Systematic Review 无线传感器网络模型:跨层系统综述
IF 3.5 Q2 COMPUTER SCIENCE, INFORMATION SYSTEMS Pub Date : 2023-06-30 DOI: 10.3390/jsan12040050
Fernando Ojeda, Diego Mendez, A. Fajardo, F. Ellinger
Wireless sensor networks (WSNs) have been adopted in many fields of application, such as industrial, civil, smart cities, health, and the surveillance domain, to name a few. Fateway and sensor nodes conform to WSN, and each node integrates processor, communication, sensor, and power supply modules, sending and receiving information of a covered area across a propagation medium. Given the increasing complexity of a WSN system, and in an effort to understand, comprehend and analyze an entire WSN, different metrics are used to characterize the performance of the network. To reduce the complexity of the WSN architecture, different approaches and techniques are implemented to capture (model) the properties and behavior of particular aspects of the system. Based on these WSN models, many research works propose solutions to the problem of abstracting and exporting network functionalities and capabilities to the final user. Modeling an entire WSN is a difficult task for researchers since they must consider all of the constraints that affect network metrics, devices and system administration, holistically, and the models developed in different research works are currently focused only on a specific network layer (physical, link, or transport layer), making the estimation of the WSN behavior a very difficult task. In this context, we present a systematic and comprehensive review focused on identifying the existing WSN models, classified into three main areas (node, network, and system-level) and their corresponding challenges. This review summarizes and analyzes the available literature, which allows for the general understanding of WSN modeling in a holistic view, using a proposed taxonomy and consolidating the research trends and open challenges in the area.
无线传感器网络(WSN)已被应用于许多领域,如工业、民用、智能城市、卫生和监控领域等。通道和传感器节点符合WSN,每个节点集成了处理器、通信、传感器和电源模块,通过传播介质发送和接收覆盖区域的信息。鉴于无线传感器网络系统的复杂性不断增加,为了理解、理解和分析整个无线传感器网络,使用不同的度量来表征网络的性能。为了降低WSN体系结构的复杂性,实现了不同的方法和技术来捕获(建模)系统的特定方面的属性和行为。基于这些WSN模型,许多研究工作提出了将网络功能和能力抽象并导出给最终用户的问题的解决方案。对研究人员来说,对整个WSN进行建模是一项艰巨的任务,因为他们必须全面考虑影响网络度量、设备和系统管理的所有约束,而不同研究工作中开发的模型目前只关注特定的网络层(物理层、链路层或传输层),这使得对WSN行为的估计成为一项非常困难的任务。在这种背景下,我们提出了一个系统而全面的综述,重点是确定现有的WSN模型,分为三个主要领域(节点、网络和系统级)及其相应的挑战。这篇综述总结和分析了现有的文献,使我们能够从整体的角度对WSN建模有一个总体的理解,使用拟议的分类法,并巩固该领域的研究趋势和悬而未决的挑战。
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引用次数: 0
The Power of Data: How Traffic Demand and Data Analytics Are Driving Network Evolution toward 6G Systems 数据的力量:流量需求和数据分析如何推动网络向6G系统发展
IF 3.5 Q2 COMPUTER SCIENCE, INFORMATION SYSTEMS Pub Date : 2023-06-27 DOI: 10.3390/jsan12040049
D. Sabella, Davide Micheli, G. Nardini
The evolution of communication systems always follows data traffic evolution and further influences innovations that are unlocking new markets and services. While 5G deployment is still ongoing in various countries, data-driven considerations (extracted from forecasts at the macroscopic level, detailed analysis of live network traffic patterns, and specific measures from terminals) can conveniently feed insights suitable for many purposes (B2B e.g., operator planning and network management; plus also B2C e.g., smarter applications and AI-aided services) in the view of future 6G systems. Moreover, technology trends from standards and research projects (such as Hexa-X) are moving with industry efforts on this evolution. This paper shows the importance of data-driven insights, by first exploring network evolution across the years from a data point of view, and then by using global traffic forecasts complemented by data traffic extractions from a live 5G operator network (statistical network counters and measures from terminals) to draw some considerations on the possible evolution toward 6G. It finally presents a concrete case study showing how data collected from the live network can be exploited to help the design of AI operations and feed QoS predictions.
通信系统的发展总是伴随着数据流量的发展,并进一步影响着打开新市场和服务的创新。虽然5G部署仍在各国进行中,但数据驱动的考虑因素(从宏观层面的预测中提取,对实时网络流量模式的详细分析,以及终端的具体措施)可以方便地提供适合多种用途的见解(B2B,例如运营商规划和网络管理;以及B2C(例如,更智能的应用程序和人工智能辅助服务),从未来6G系统的角度来看。此外,来自标准和研究项目(如Hexa-X)的技术趋势也随着行业的发展而变化。本文首先从数据的角度探讨了多年来的网络演变,然后通过使用全球流量预测,并辅以实时5G运营商网络的数据流量提取(统计网络计数器和终端测量),对可能向6G发展的一些考虑,展示了数据驱动见解的重要性。最后给出了一个具体的案例研究,展示了如何利用从现场网络收集的数据来帮助设计人工智能操作和提供QoS预测。
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引用次数: 0
Design, Analysis, and Simulation of 60 GHz Millimeter Wave MIMO Microstrip Antennas 60 GHz毫米波MIMO微带天线的设计、分析与仿真
IF 3.5 Q2 COMPUTER SCIENCE, INFORMATION SYSTEMS Pub Date : 2022-01-01 DOI: 10.3390/jsan11040059
J. C. Quintero, Edith Paola Estupiñán Cuesta, Gabriel Leonardo Escobar Quiroga
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引用次数: 0
MINDS: Mobile Agent Itinerary Planning Using Named Data Networking in Wireless Sensor Networks 在无线传感器网络中使用命名数据网络的移动代理行程规划
IF 3.5 Q2 COMPUTER SCIENCE, INFORMATION SYSTEMS Pub Date : 2021-04-22 DOI: 10.3390/jsan10020028
Saeid Pourroostaei Ardakani
Mobile agents have the potential to offer benefits, as they are able to either independently or cooperatively move throughout networks and collect/aggregate sensory data samples. They are programmed to autonomously move and visit sensory data stations through optimal paths, which are established according to the application requirements. However, mobile agent routing protocols still suffer heavy computation/communication overheads, lack of route planning accuracy and long-delay mobile agent migrations. For this, mobile agent route planning protocols aim to find the best-fitted paths for completing missions (e.g., data collection) with minimised delay, maximised performance and minimised transmitted traffic. This article proposes a mobile agent route planning protocol for sensory data collection called MINDS. The key goal of this MINDS is to reduce network traffic, maximise data robustness and minimise delay at the same time. This protocol utilises the Hamming distance technique to partition a sensor network into a number of data-centric clusters. In turn, a named data networking approach is used to form the cluster-heads as a data-centric, tree-based communication infrastructure. The mobile agents utilise a modified version of the Depth-First Search algorithm to move through the tree infrastructure according to a hop-count-aware fashion. As the simulation results show, MINDS reduces path length, reduces network traffic and increases data robustness as compared with two conventional benchmarks (ZMA and TBID) in dense and large wireless sensor networks.
移动代理具有提供好处的潜力,因为它们能够在网络中独立或合作移动,并收集/汇总感官数据样本。它们被编程为通过根据应用需求建立的最优路径自主移动和访问传感数据站。然而,移动代理路由协议仍然存在计算/通信开销大、路由规划精度低和移动代理迁移延迟长的问题。为此,移动代理路由规划协议旨在找到最适合的路径来完成任务(例如,数据收集),具有最小的延迟,最大的性能和最小的传输流量。本文提出了一种用于感知数据采集的移动代理路由规划协议MINDS。这个MINDS的关键目标是减少网络流量,最大化数据鲁棒性,同时最小化延迟。该协议利用汉明距离技术将传感器网络划分为多个以数据为中心的集群。反过来,使用命名的数据网络方法将集群头形成为以数据为中心、基于树的通信基础设施。移动代理使用深度优先搜索算法的修改版本,根据跳数感知的方式在树基础结构中移动。仿真结果表明,在密集和大型无线传感器网络中,与两种传统基准(ZMA和TBID)相比,MINDS减少了路径长度,减少了网络流量,提高了数据鲁棒性。
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引用次数: 1
Acknowledgement to Reviewers of JSAN in 2016 2016年对JSAN评审员的致谢
IF 3.5 Q2 COMPUTER SCIENCE, INFORMATION SYSTEMS Pub Date : 2017-03-01 DOI: 10.3390/JSAN6010001
M. Albano, Carl Anthony, A. Arefi, A. Arriola, G. Barton, An Beongku, Kim Boström, Pedro Brandao, J. Calbimonte, J. Decotignie, J. Delsing, H. Eguiraun, Lloyd E. Emokpae, F. Farahmand, Piedad Garrido, Mouzhi Ge, A. Giani, Luis Sanchez Gonzalez, A. Gotta, Shi-Jun He, Noelia Hernandez, Chien-Chang Hsu, P. Jayaraman, Keonwook Kim, P. Kokkinos, Timilehin Labeodan, Duc Le, Tian-Fu Lee, Yingsong Li, Chin-Feng Lin, Jaime Lloret-Mauri, Andrea Marin, M. Martalò, R. Meseguer, P. Minet, N. Mitton, Antonio Moreno, J. P. Muñoz-Gea, C. Pham, A. Piras, A. Puliafito, Yuansong Qiao, Dariusz Rzońca, N. Savage, Marialisa Scatá, M. Sha, Farhad Shahnia, I. Silva, D. Singh, V. Soares, S. Szott, Rui Teng, J. Tervonen, K. Tsang, L. Vangelista, Praneeth Vepakomma, G. Verticale, J. Villadangos, Jiafu Wan, K. Wang, Xin Wang, Yuan-Ting Wu, Boachang Yang, M. Zappatore, Xinming Zhang, Yanjun Zhao
The editors of JSAN would like to express their sincere gratitude to the following reviewers for assessing manuscripts in 2015. We greatly appreciate the contribution of expert reviewers, which is crucial to the journal’s editorial decision-making process. Several steps have been taken in 2015 to thank and acknowledge reviewers. Good, timely reviews are rewarded with a discount off their next MDPI publication. By creating an account on the submission system, reviewers can access details of their past reviews, see the comments of other reviewers, and download a letter of acknowledgement for their records. This is all done, of course, within the constraints of reviewer confidentiality. Feedback from reviewers shows that most see their task as a voluntary and mostly unseen work in service to the scientific community. We are grateful to our reviewers for the contribution they make.
JSAN的编辑们对以下评审员在2015年对稿件进行评估表示衷心的感谢。我们非常感谢专家评审员的贡献,这对期刊的编辑决策过程至关重要。2015年采取了一些步骤来感谢和表彰审查人员。好的、及时的评论会在下一期MDPI出版物上获得折扣。通过在提交系统上创建一个帐户,评审员可以访问他们过去评审的详细信息,查看其他评审员的评论,并下载他们记录的确认信。当然,这一切都是在审查员保密的限制下完成的。来自评审员的反馈显示,大多数人认为他们的任务是自愿的,而且大多是为科学界服务的无形工作。我们感谢我们的评审人员所做的贡献。
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引用次数: 5
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Journal of Sensor and Actuator Networks
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