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Experimental void fraction measurement approach of small channel two-phase flow 小通道两相流的实验空隙率测量方法
Q4 Engineering Pub Date : 2024-09-28 DOI: 10.1016/j.measen.2024.101306
Alireza Abedini , Ali Nouri Borujerdi , Mohammad Najafi , Aminreza Noghrehabadi
This investigation presents a novel experimental approach for assessing void fraction parameters in two-phase flows within microchannels. The study critiques the conventional impedance methods that utilize alternating current (AC) for void fraction measurements, highlighting the inherent drawbacks such as ground capacitance interference and non-uniform current distribution. To circumvent these issues, the research introduces the use of direct current (DC), which ensures a homogeneous distribution across the conductor's cross-section, as a more reliable alternative. Termed the "Direct Impedance Method," this technique employs DC to enhance the accuracy of void fraction measurements. The study explores various geometric configurations of full-ring and half-ring electrodes, both vertical and horizontal, within a microchannel of 500 μm diameter. An empirical formula is derived to calculate the void fraction from the electrical data obtained. High-speed imaging at 4000 frames per second supplements the method by providing visual confirmation of the flow patterns. The comparative analysis of the direct impedance method and image processing using the homogeneous theoretical model reveals a deviation of approximately 2 %–10 % for the slug and annular flow pattern. In contrast, the deviation is more for the bubble pattern. The results affirm that the Direct Impedance Method is a cost-effective and reasonably precise technique for small-channel applications. Its accuracy is inversely proportional to the channel diameter, rendering it unsuitable for channels larger than 2 mm. The method's low construction cost further enhances its practical appeal.
这项研究提出了一种新颖的实验方法,用于评估微通道内两相流的空隙率参数。研究对利用交流电测量空隙率的传统阻抗方法进行了批评,强调了其固有的缺点,如接地电容干扰和电流分布不均匀。为了规避这些问题,研究引入了直流电(DC)作为更可靠的替代方法,它能确保导体横截面上的均匀分布。这项技术被称为 "直接阻抗法",利用直流电提高空隙率测量的准确性。该研究探讨了直径为 500 微米的微通道内垂直和水平全环和半环电极的各种几何配置。根据获得的电学数据,得出了计算空隙率的经验公式。每秒 4000 帧的高速成像对该方法进行了补充,提供了流动模式的视觉确认。通过对直接阻抗法和使用均质理论模型的图像处理法进行比较分析,发现弹头和环形流动模式的偏差约为 2%-10%。相比之下,气泡模式的偏差更大。结果证明,直接阻抗法是一种经济有效且相当精确的小通道应用技术。它的精确度与通道直径成反比,因此不适用于大于 2 毫米的通道。该方法的建造成本低,进一步增强了其实用性。
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引用次数: 0
Crystal structure, optical, photoluminescence, Raman, and magnetic properties for Sm-doped Cr-Mg-Bi ferrites 掺杂 Sm 的铬镁铋铁氧体的晶体结构、光学、光致发光、拉曼和磁学特性
Q4 Engineering Pub Date : 2024-09-26 DOI: 10.1016/j.measen.2024.101307
Banothu Naresh, Bhukya Venkatesh, J. Laxman Naik
The current work,A series of rare earth Sm3+ ion substituted Cr-Mg-Bi ferrites Cr0.7Mg0.2Bi0.1SmxFe2-xO4 (x = 0.00, 0.02, 0.04, and 0.06) have beensynthesized by thesol-gel auto-combustion method. The XRD, FESEM, HRTEM,UV–Vis, FTIR, Raman spectroscopy, Photo Luminesce and Magnetic Properties analysis have been used to investigate structural, morphological, optical, Raman spectroscopy, Photo Luminesce and Magnetic Properties. Every sample contains a single-phase spinel structure, as confirmed by XRD.The substitution of Sm3+ ions is found to increase the lattice parameter from 8.258 to 8.248 Å.A monotone diffraction peak (311) is visible near small angles of degrees (35.33–35.13). The Debye-Scherrer equation, the nanoparticles' crystallite size ranges from 35.357 to 54.778 nm.FE-SEMs reveal a spherical grain that groups and has a porous form, with particles 38.13–53.28 nmin size.HR-TEM micrographs illustrate spherical morphology and their average particle size decreases from 55.32 to 65.42 nm. The selected area electron diffraction (SAED) pattern confirms the crystal planes which were revealed from XRD calculations.The spinel structure was confirmed by FTIR spectroscopy, which found 414 cm−1 and 516 cm−1 vibrational band at the octahedral and tetrahedral sites.As the concentration of Sm3+ rises, the direct and indirect band gap energy values determined from UV–Vis show an increase and decrease.The generated NPs' semiconducting nature is confirmed by the strong correlation between the g-value and particle size change.Photoluminescence (PL) investigation shows that all processed samples have four bands.(i) peak centered at 412 nm, which is near-band edge emission and corresponds to the ultraviolet (UV) band,(ii) The violet band has a high-intensity peak at 434 nm,(iii) The blue band is related to a low-intensity, sharp peak located at 466 nm, and (iv) A broad peak at 502 nm with a very low intensity distinguishes the green band.The Raman spectroscopy investigation revealed that the CMBSF nanoparticles had a mixed spinel structure. The magnetic investigation shows that when the Sm content of ferrites increases, saturation magnetization drops from 39.86 to 33.16 emu/g.The sample's coercivity (Hc) increases from 16.06 to 21.90 KOe with Sm substitution.
本研究采用溶胶-凝胶自燃烧法合成了一系列稀土 Sm3+ 离子取代的 Cr-Mg-Bi 铁氧体 Cr0.7Mg0.2Bi0.1SmxFe2-xO4(x = 0.00、0.02、0.04 和 0.06)。采用 XRD、FESEM、HRTEM、UV-Vis、FTIR、拉曼光谱、光致发光和磁性能分析方法对其结构、形态、光学、拉曼光谱、光致发光和磁性能进行了研究。经 XRD 证实,每个样品都含有单相尖晶石结构。取代 Sm3+ 离子后,晶格参数从 8.258 Å 增加到 8.248 Å。根据 Debye-Scherrer 方程,纳米颗粒的晶粒大小在 35.357 至 54.778 nm 之间。FE-SEM 显示的球形晶粒具有群集和多孔形式,颗粒大小为 38.13-53.28 nmin。HR-TEM 显微照片显示了球形形态,其平均颗粒大小从 55.32 nm 减小到 65.42 nm。傅立叶变换红外光谱证实了尖晶石结构,在八面体和四面体位点发现了 414 cm-1 和 516 cm-1 的振动带。随着 Sm3+ 浓度的增加,紫外可见光谱测定的直接和间接带隙能值显示出增加和减少。光致发光(PL)调查显示,所有处理过的样品都有四个波段:(i) 以 412 nm 为中心的峰值是近带边缘发射,对应紫外(UV)波段;(ii) 紫色波段在 434 nm 处有一个高强度峰值;(iii) 蓝色波段与位于 466 nm 处的低强度尖锐峰值有关;(iv) 绿色波段在 502 nm 处有一个强度很低的宽峰值。拉曼光谱研究表明,CMBSF 纳米粒子具有混合尖晶石结构。磁性研究表明,当铁氧体中的 Sm 含量增加时,饱和磁化率从 39.86 降至 33.16 emu/g。
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引用次数: 0
Application of improved fish school algorithm in variable frequency speed control system 改进的鱼群算法在变频调速系统中的应用
Q4 Engineering Pub Date : 2024-09-21 DOI: 10.1016/j.measen.2024.101308
Shanshan Wu , Letao Yu
In order to solve the problems of long adjustment time and poor stability of the commonly used speed current variable frequency negative feedback speed control system in engineering, the author proposes an improved fish school algorithm application method in variable frequency speed control systems. A fish swarm algorithm optimized based on the arena method is applied to a variable frequency speed control system, and the optimization algorithm is applied to the speed control system to screen the PI parameters that meet the requirements of the speed control system. The simulation results show that compared with manual parameter tuning, the controller parameters optimized by the improved fish school algorithm have better control performance. In the absence of overshoot starting, the starting time was shortened by 0.21s, and the system response speed was improved. When a sudden load of 6 N m is applied, the speed drop is reduced by 3 r · min−1, and the recovery time is shortened by 0.15 s, resulting in stronger anti-interference performance of the system. Conclusion: The new algorithm shortens the control time and improves the robustness of the system.
为了解决工程中常用的速度电流变频负反馈调速系统调节时间长、稳定性差等问题,作者提出了一种改进的鱼群算法在变频调速系统中的应用方法。将基于竞技场法优化的鱼群算法应用于变频调速系统,并将优化算法应用于调速系统,筛选出符合调速系统要求的 PI 参数。仿真结果表明,与手动参数调整相比,改进的鱼群算法优化的控制器参数具有更好的控制性能。在无过冲启动的情况下,启动时间缩短了 0.21s,系统响应速度得到提高。当突然施加 6 N m 的负载时,速度下降减少了 3 r - min-1,恢复时间缩短了 0.15 s,系统的抗干扰性能更强。结论新算法缩短了控制时间,提高了系统的鲁棒性。
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引用次数: 0
Enhancing Wireless Sensor Network lifetime through hierarchical chain-based routing and horizontal network partitioning techniques 通过基于层次链的路由和水平网络分区技术提高无线传感器网络的使用寿命
Q4 Engineering Pub Date : 2024-09-16 DOI: 10.1016/j.measen.2024.101300
V.Rama Krishna, Vuppala Sukanya, Mohd Abdul Hameed
The efficient use of energy is a critical aspect in Wireless Sensor Networks (WSNs) to prolong the network's lifespan. Investigating routing in WSNs requires considering the effective establishment of chains or clustering methods to optimize the network. The proposed routing technique aims to enhance sensor longevity through different network partitioning methods. The strategy employs the PEGASIS (Power Efficient Gathering in Sensor Information Systems) protocol, which uses Prim's Algorithm to adjust the chain structure and is based on hierarchical chain-based routing. To transmit data from working nodes to the base station (BS), horizontal network partitioning techniques called EEPEG-PA-H and EEPEG-PA-V are utilized. The transition occurs when a node's remaining energy is low. This method has the potential to significantly increase the average network lifespan compared to existing routing methods. For example, EEPEG-PA-H improves longevity by 22.7763 % compared to PEGASIS and by 1.259 % compared to EEPEG-PA across various network sizes using senor.
在无线传感器网络(WSN)中,有效利用能源是延长网络寿命的一个关键环节。研究 WSN 中的路由选择需要考虑有效建立链或聚类方法,以优化网络。所提出的路由技术旨在通过不同的网络划分方法来提高传感器的寿命。该策略采用了 PEGASIS(传感器信息系统中的功率高效聚集)协议,该协议使用普里姆算法调整链结构,并基于分层链式路由。为了从工作节点向基站(BS)传输数据,采用了名为 EEPEG-PA-H 和 EEPEG-PA-V 的水平网络分区技术。当节点的剩余能量较低时,就会发生转换。与现有的路由方法相比,这种方法有可能大大提高网络的平均寿命。例如,与 PEGASIS 相比,EEPEG-PA-H 的寿命提高了 22.7763%,与使用 senor 的 EEPEG-PA 相比,EEPEG-PA-H 的寿命提高了 1.259%。
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引用次数: 0
Enhancing healthcare with AI: Sustainable AI and IoT-Powered ecosystem for patient aid and interpretability analysis using SHAP 利用人工智能加强医疗保健:使用 SHAP 进行患者援助和可解释性分析的可持续人工智能和物联网生态系统
Q4 Engineering Pub Date : 2024-09-12 DOI: 10.1016/j.measen.2024.101305
Biplov Paneru , Bishwash Paneru , Sanjog Chhetri Sapkota , Ramhari Poudyal

The healthcare industry has blossomed into one of the most pivotal and technologically advanced sectors in the past decade. Individuals grapple with the peril of untimely demise from diverse ailments as patients suffer from delayed treatment. The paramount objective is to forge a dependable patient care system utilizing the Internet of Things (IoT), enabling physicians to monitor patients' well-being within medical facilities or even the confines of their homes. The system aids in tracking the patient's SpO2 level, body temperature, pulse rate (beats per minute), room temperature, and humidity, then trains the data with machine learning algorithms for the patient and finally monitors it through the Blynk IoT system. The cloud-stored data can be harnessed to ascertain and supervise one's health and predict forthcoming perils. This study unveils an efficacious decision-making model custom-tailored for Internet of Things (IoT) ventures, and the proposed trained algorithm satiates these requirements, offering efficiency and precision, rendering it appropriate for numerous IoT applications. Finally, the Shapley Additive Explanations (SHAP) is used here for finding out the most influential parameters, and Explainable AI (XAI) is utilized with the help of SHAP values for enhanced information on affecting parameters. The SVC model's hyperparameter is properly adjusted, yielding a testing accuracy of 98.83 % and a training accuracy of 98.71 %. On cross-validation, the lightweight Sklearn model achieved a mean accuracy of almost 99 %. And with a SHAP weightage magnitude of 1.38, 0.91, and 0.44 for Class ‘Good’, Class ‘Poor’, and Class ‘Bad’, respectively, patients SpO2 level is the most significant feature.

在过去十年中,医疗保健行业已发展成为最重要、技术最先进的行业之一。患者因延误治疗而面临各种疾病导致过早死亡的危险。我们的首要目标是利用物联网(IoT)打造可靠的病人护理系统,使医生能够在医疗机构甚至病人家中监控病人的健康状况。该系统有助于跟踪病人的 SpO2 水平、体温、脉搏(每分钟跳动次数)、室温和湿度,然后利用机器学习算法对病人的数据进行训练,最后通过 Blynk 物联网系统进行监控。云存储数据可用于确定和监督个人健康状况,并预测即将发生的危险。本研究揭示了一种为物联网(IoT)企业量身定制的高效决策模型,所提出的训练有素的算法满足了这些要求,提供了效率和精度,使其适用于众多物联网应用。最后,这里使用了夏普利加法解释(SHAP)来找出最有影响力的参数,并在 SHAP 值的帮助下利用可解释人工智能(XAI)来增强影响参数的信息。SVC 模型的超参数经过适当调整后,测试准确率达到 98.83%,训练准确率达到 98.71%。在交叉验证中,轻量级 Sklearn 模型的平均准确率接近 99%。好 "类、"差 "类和 "坏 "类的 SHAP 权重分别为 1.38、0.91 和 0.44,患者的 SpO2 水平是最重要的特征。
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引用次数: 0
Comparative analysis of Vedic multiplier using Vedic sutras with existing multipliers in biomedical application 使用吠陀经文的吠陀乘法器与生物医学应用中现有乘法器的比较分析
Q4 Engineering Pub Date : 2024-09-12 DOI: 10.1016/j.measen.2024.101302
R. Karthi Kumar , S.P. Vimal

In today's computer world, a lot of real-time applications require rapid processing units. Arithmetic Logic Units (ALU) and Multiply-Accumulate (MAC) are the fundamental parts of these circuits and are necessary for their effective and rapid operation. The most significant prevalent part of digital signal processing devices is multipliers. The multiplier, adder, and registers need to be changed in order to maintain accuracy and increase execution speed, which will improve the performance of the ALU and MAC. The development of greater multipliers is being given priority for application in processors because of the increasing constraints on latency. To accelerate multiplication, it is essential to develop quicker multipliers. Vedic multipliers are preferred over different current expansions due to their low power consumption, fast operation, and efficient use of space. Vedic mathematics-based algorithms are often utilized to build quick, low-power multipliers. In addition to simulation results, this section covers the four sutras of Vedic mathematics: Urdhva Tiryakbhyam, Ekadhikena Purvena, Ekanyunena Purvena, and Nikhilam. Vedic multipliers are also compared to a variety of modern multipliers, including booth, Wallace, and array multipliers. All of the sutras are evaluated according to area, speed, power, propagation delay, and mean relative error (MRE) in the current research. The results of the study will be applied in the biomedical field.

在当今的计算机世界中,许多实时应用都需要快速处理单元。算术逻辑单元(ALU)和乘法累加器(MAC)是这些电路的基本组成部分,也是它们有效和快速运行的必要条件。乘法器是数字信号处理设备中最重要的组成部分。乘法器、加法器和寄存器需要改变,以保持精度并提高执行速度,从而改善 ALU 和 MAC 的性能。由于对延迟的限制越来越多,因此开发更大的乘法器在处理器中的应用成为当务之急。为了加速乘法运算,必须开发更快的乘法器。吠陀乘法器具有功耗低、运行速度快、空间利用率高等优点,是目前各种扩展乘法器的首选。基于吠陀数学的算法通常被用来构建快速、低功耗的乘法器。除仿真结果外,本节还介绍了吠陀数学的四部经文:Urdhva Tiryakbhyam、Ekadhikena Purvena、Ekanyunena Purvena 和 Nikhilam。此外,还将吠陀乘法器与各种现代乘法器进行了比较,包括展位乘法器、华莱士乘法器和阵列乘法器。目前的研究根据面积、速度、功率、传播延迟和平均相对误差 (MRE) 对所有乘法器进行了评估。研究结果将应用于生物医学领域。
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引用次数: 0
Urban Odyssey: “Pioneering multimodal routes for Tomorrow's smart cities” 城市奥德赛"为明天的智慧城市开辟多式联运路线
Q4 Engineering Pub Date : 2024-09-06 DOI: 10.1016/j.measen.2024.101301
Vishwas Deep Joshi , Priya Agarwal , Ajay Kumar , Namrata Dogra , Durgesh Nandan

Getting around in modern cities has become a daily puzzle for both residents and travelers. As cities increasingly evolve into complex hubs of innovation and development, the demand for efficient transportation solutions has never been higher. In the multifaceted field of urban transportation, cost-effective and efficient mobility remains a high priority. This paper looks at how cities are planning better ways for people to travel and move within the growing scope of multimodal transportation, a paradigm shift beyond traditional single-mode transit systems. Our approach to improving urban transport revolves around a few key principles: integration, innovation, and collaboration. Integration means bringing together different modes of transportation – like buses, trains, bikes, and even new technologies like ride-sharing services to make it easier for people to switch between them. This transformative approach not only aims to reduce congestion and reduce environmental footprints but also prioritizes user experience while ensuring a harmonious blend of convenience, sustainability, and accessibility. We use new technology and ideas to ensure that travel is easy, quick, and good for the environment. Looking at new trends and examples from around the world, this overview shows how cities are shaping a better future for everyone's daily commute. In this paper, we use Lingo software to solve a numerical example related to multi-modal transportation, demonstrating practical solutions for real-world implementation. Through innovation, we can find creative solutions to urban transportation challenges. Additionally, public transportation enhancements, such as the introduction of synchronized bus routes and electric vehicle charging stations, underline the commitment to sustainability and inclusivity. In the dynamic urban transportation landscape, cities will revolutionize our approach to providing cost-effective and efficient mobility solutions.

在现代城市中,出行已成为居民和旅行者的日常难题。随着城市日益发展成为复杂的创新和发展中心,对高效交通解决方案的需求也空前高涨。在城市交通的多层面领域,具有成本效益的高效交通仍是重中之重。本文探讨了城市如何在日益发展的多式联运(一种超越传统单一交通方式的范式转变)范围内为人们规划更好的出行和移动方式。我们改善城市交通的方法围绕几个关键原则:整合、创新和协作。整合意味着将不同的交通方式(如公交车、火车、自行车,甚至共享单车服务等新技术)整合在一起,使人们能够更方便地在不同交通方式之间切换。这种变革性的方法不仅旨在减少交通拥堵和环境足迹,还优先考虑用户体验,同时确保便利性、可持续性和可及性的和谐统一。我们利用新技术和新理念,确保出行方便、快捷、环保。通过观察世界各地的新趋势和实例,本综述展示了城市如何为每个人的日常通勤打造更美好的未来。在本文中,我们使用 Lingo 软件解决了一个与多式联运相关的数值示例,展示了在现实世界中实施的实用解决方案。通过创新,我们可以找到应对城市交通挑战的创造性解决方案。此外,公共交通的改进,如引入同步公交线路和电动汽车充电站,也彰显了对可持续发展和包容性的承诺。在充满活力的城市交通环境中,城市将彻底改变我们提供经济高效的交通解决方案的方式。
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引用次数: 0
Wavelet-based convolutional neural network for non-intrusive load monitoring of next generation shipboard Power Systems 基于小波的卷积神经网络用于下一代舰载电力系统的非侵入式负载监测
Q4 Engineering Pub Date : 2024-09-04 DOI: 10.1016/j.measen.2024.101298
Soroush Senemmar , Jie Zhang

In this study, a non-intrusive load monitoring (NILM) framework is developed for next generation shipboard power systems (SPS) based on a discrete wavelet transform signal processing and a convolutional neural network (CNN). We have applied the developed NILM method to a four-zone medium voltage direct current (MVDC) SPS to evaluate the effectiveness of the proposed method. Each zone of the MVDC SPS consists of multiple components, such as propulsion load, pulsed load, high ramp rate load, cooling load, and hotel load. The current signals from the main generators are the main inputs to the NILM model. The current signals are first processed through a discrete wavelet transform to create a coefficient vector that reflects the status of all the components in each zone. Then, a multi-class classification problem is formulated and solved using a CNN architecture model to monitor the load statuses in real time. The results of case studies show that the developed NILM model in comparison with benchmark methods can (i) accurately monitor the status of all components with a total accuracy of over 98%, (ii) identify unique pulsed loads with a total accuracy of over 99%, and (iii) sustain the functionality of load monitoring under extreme events such as cyber/physical attacks, load uncertainty, and noisy inputs.

本研究基于离散小波变换信号处理和卷积神经网络(CNN),为下一代舰载电力系统(SPS)开发了非侵入式负载监测(NILM)框架。我们将所开发的 NILM 方法应用于四区中压直流 (MVDC) SPS,以评估所建议方法的有效性。中压直流 SPS 的每个区都由多个组件组成,如推进负载、脉冲负载、高斜率负载、冷却负载和酒店负载。来自主发电机的电流信号是 NILM 模型的主要输入。首先通过离散小波变换对电流信号进行处理,以创建反映每个区域所有组件状态的系数向量。然后,利用 CNN 架构模型制定并解决多类分类问题,以实时监控负载状态。案例研究结果表明,与基准方法相比,所开发的 NILM 模型能够:(i) 准确监控所有组件的状态,总准确率超过 98%;(ii) 识别独特的脉冲负载,总准确率超过 99%;(iii) 在网络/物理攻击、负载不确定性和高噪声输入等极端事件下保持负载监控功能。
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引用次数: 0
A modified CNN-IDS model for enhancing the efficacy of intrusion detection system 增强入侵检测系统功效的改进型 CNN-IDS 模型
Q4 Engineering Pub Date : 2024-09-03 DOI: 10.1016/j.measen.2024.101299
Ruqaya Abdulhasan Abed, Ekhlas Kadhum Hamza, Amjad J. Humaidi

As the security of computer networks in enterprises worldwide is dependent on the proper functioning of intrusion detection systems (IDSs) and intrusion prevention systems (IPSs), this effectiveness of both of them is of utmost priority. Leveraging diverse techniques, these network security systems are created to keep the reliability, the availability, and the integrity of the organizational networks safe. One plus point of using ML in intrusion detection system (IDS) is that it has successfully weeded out all the IDS attacks with a high degree of accuracy. In contrast, such systems may be believed to operate to their least competent levels when supersized data spaces have to be dealt with. In the process to solve this, application of feature selection techniques will play the crucial role to ignore non-relevant features which do not impact the issue of classification much. One more thing to keep in mind is that the ML-based IDSs often have problems with high false alarms and percentage accuracy because of the imbalanced training sets. The undertaking of this paper involves a through the analysis of the UNSW-NB15 intrusion detection data set as upon which our models will be tested and trained. We utilize two feature selection approaches: the PCA method, which is denoted as PCA, and the SVD method, called SVD. Furthermore, we categorize the datasets using these methods— Ridge Regression (RR), Stochastic Gradient Descent, and Convolutional Neural Network (CNN)-- on the transformed feature space. What is the most widely used for, is that it deals with both, binary and multiclass classification. The result measure that PCA and SVD are succeeded in getting better performance of IDS than others with enhancing the accuracy of classification models. More specifically, the RR classifier's precise was outstanding for the binary classification problem experiencing a rise in the accuracy from 98.13 % to 99.85 %. This shows the critical role of feature selection approaches and is also demonstrates the modeling capabilities of RR, SGD, and CNN classifiers and stands out as a solution to intrusion detection.

全球企业的计算机网络安全取决于入侵检测系统(IDS)和入侵防御系统(IPS)的正常运行,因此这两个系统的有效性是重中之重。这些网络安全系统利用各种技术,确保组织网络的可靠性、可用性和完整性。在入侵检测系统(IDS)中使用 ML 的一个优点是,它能成功地剔除所有 IDS 攻击,而且准确率很高。与此相反,当需要处理超大数据空间时,此类系统可能会被认为是最不称职的。在解决这个问题的过程中,特征选择技术的应用将起到至关重要的作用,它可以忽略对分类问题影响不大的非相关特征。还需要注意的一点是,由于训练集不平衡,基于 ML 的 IDS 通常会出现误报率和准确率较高的问题。本文将分析 UNSW-NB15 入侵检测数据集,并在此基础上测试和训练我们的模型。我们采用了两种特征选择方法:PCA 方法(简称 PCA)和 SVD 方法(简称 SVD)。此外,我们还在转换后的特征空间上使用岭回归(RR)、随机梯度下降和卷积神经网络(CNN)等方法对数据集进行分类。其中使用最广泛的是二元分类法和多分类法。结果表明,PCA 和 SVD 在提高分类模型的准确性方面比其他方法成功地获得了更好的 IDS 性能。更具体地说,在二元分类问题上,RR 分类器的准确性非常突出,准确率从 98.13% 上升到 99.85%。这表明了特征选择方法的关键作用,同时也证明了 RR、SGD 和 CNN 分类器的建模能力,并可作为入侵检测的一种解决方案。
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引用次数: 0
Internet of things and optimized knn based intelligent transportation system for traffic flow prediction in smart cities 基于物联网和优化 knn 的智能交通系统,用于智能城市交通流量预测
Q4 Engineering Pub Date : 2024-08-23 DOI: 10.1016/j.measen.2024.101297
Sunkara Teena Mrudula , Meenakshi , Mahyudin Ritonga , S. Sivakumar , Malik Jawarneh , Sammy F , T. Keerthika , Kantilal Pitambar Rane , Bhaskar Roy

The rapid expansion of urban areas and the increasing number of vehicles on the road have resulted in accidents, traffic congestion, economic repercussions, environmental deterioration, and excessive fuel consumption. A dependable traffic management system is necessary to anticipate and regulate urban traffic patterns. Traffic forecast aids in the prevention of traffic issues. Urban traffic predictions often utilise historical and current traffic flow data to forecast road conditions. This article presents a traffic flow prediction system that utilises the Internet of Things (IoT), machine learning, and feature selection. Internet of Things (IoT) devices located on highways or within cars gather sensor data in real-time. The input data set comprises both real-time Internet of Things (IoT) data and historical traffic statistics. The input data is stored in a centralized cloud. The data is subjected to preprocessing in order to eliminate any unwanted interference and identify any exceptional values. The accuracy and root mean square error are contingent upon the process of feature selection. Particle swarm optimization identifies and extracts crucial features from input data. The classification model is constructed using K Nearest Neighbor, Multi layer Perceptron, and Bayes network approaches. The UCI traffic data is used for conducting experiments. The dataset has 47 attributes and 2102 occurrences. The accuracy of traffic flow prediction using PSO KNN is 96 %. The PSO KNN algorithm achieved a Mean Square Error (MSE) of 0.00289 and a Root Mean Square Error (RMSE) of 0.0595.

城市地区的迅速扩张和道路上车辆数量的不断增加导致了交通事故、交通拥堵、经济影响、环境恶化和燃料消耗过多。一个可靠的交通管理系统对预测和调节城市交通模式十分必要。交通预测有助于预防交通问题。城市交通预测通常利用历史和当前交通流量数据来预测道路状况。本文介绍了一种利用物联网(IoT)、机器学习和特征选择的交通流量预测系统。位于高速公路上或汽车内的物联网(IoT)设备实时收集传感器数据。输入数据集包括实时物联网数据和历史交通统计数据。输入数据存储在中央云中。数据经过预处理,以消除任何不必要的干扰并识别任何异常值。准确度和均方根误差取决于特征选择过程。粒子群优化能从输入数据中识别并提取关键特征。使用 K 最近邻、多层感知器和贝叶斯网络方法构建分类模型。实验使用的是 UCI 流量数据。该数据集有 47 个属性和 2102 次出现。使用 PSO KNN 预测交通流量的准确率为 96%。PSO KNN 算法的均方误差 (MSE) 为 0.00289,均方根误差 (RMSE) 为 0.0595。
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引用次数: 0
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Measurement Sensors
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