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Total 1395 results found since Jan 2013.

Sensors, Vol. 21, Pages 3037: A Hybrid Differential Symbiotic Organisms Search Algorithm for UAV Path Planning
Li Ma Unmanned aerial vehicle (UAV) path planning is crucial in UAV mission fulfillment, with the aim of finding a satisfactory path within affordable time and moderate computation resources. The problem is challenging due to the complexity of the flight environment, especially in three-dimensional scenarios with obstacles. To solve the problem, a hybrid differential symbiotic organisms search (HDSOS) algorithm is proposed by combining the mutation strategy of differential evolution (DE) with the modified strategies of symbiotic organism search (SOS). The proposed algorithm preserves the local search capability of S...
Source: Sensors - April 26, 2021 Category: Biotechnology Authors: Huo Zhu Li Ma Tags: Article Source Type: research

Sensors, Vol. 21, Pages 3576: ECS-NL: An Enhanced Cuckoo Search Algorithm for Node Localisation in Wireless Sensor Networks
g-Chi Lee Node localisation plays a critical role in setting up Wireless Sensor Networks (WSNs). A sensor in WSNs senses, processes and transmits the sensed information simultaneously. Along with the sensed information, it is crucial to have the positional information associated with the information source. A promising method to localise these randomly deployed sensors is to use bio-inspired meta-heuristic algorithms. In this way, a node localisation problem is converted to an optimisation problem. Afterwards, the optimisation problem is solved for an optimal solution by minimising the errors. Various bio-inspired algo...
Source: Sensors - May 21, 2021 Category: Biotechnology Authors: Vaibhav Kotiyal Abhilash Singh Sandeep Sharma Jaiprakash Nagar Cheng-Chi Lee Tags: Article Source Type: research

Sensors, Vol. 21, Pages 3994: Privacy-Enhancing k-Nearest Neighbors Search over Mobile Social Networks
feng Xu Focusing on the diversified demands of location privacy in mobile social networks (MSNs), we propose a privacy-enhancing k-nearest neighbors search scheme over MSNs. First, we construct a dual-server architecture that incorporates location privacy and fine-grained access control. Under the above architecture, we design a lightweight location encryption algorithm to achieve a minimal cost to the user. We also propose a location re-encryption protocol and an encrypted location search protocol based on secure multi-party computation and homomorphic encryption mechanism, which achieve accurate and secure k-nearest ...
Source: Sensors - June 9, 2021 Category: Biotechnology Authors: Yuxi Li Fucai Zhou Yue Ge Zifeng Xu Tags: Article Source Type: research

Sensors, Vol. 21, Pages 4729: Reconfigurable Antenna Array Direction Finding System Based on a Fast Search Algorithm
inan Wang In a traditional antenna array direction finding system, all the antenna sensors need to work or shut down at the same time, which often leads to signal crosstalk, signal distortion, and other electromagnetic compatibility problems. In addition, the direction-finding algorithm in a traditional system needs a tremendous spectral search, which consumes considerable time. To compensate for these deficiencies, a reconfigurable antenna array direction finding system is established in this paper. This system can dynamically load part or all of the antennas through microwave switches (such as a PIN diode) and conduc...
Source: Sensors - July 10, 2021 Category: Biotechnology Authors: Chunxi Liu Dongliang Peng Zhikun Chen Yong Wu Binan Wang Tags: Communication Source Type: research

Sensors, Vol. 21, Pages 6927: HARNAS: Human Activity Recognition Based on Automatic Neural Architecture Search Using Evolutionary Algorithms
ingshu He Human activity recognition (HAR) based on wearable sensors is a promising research direction. The resources of handheld terminals and wearable devices limit the performance of recognition and require lightweight architectures. With the development of deep learning, the neural architecture search (NAS) has emerged in an attempt to minimize human intervention. We propose an approach for using NAS to search for models suitable for HAR tasks, namely, HARNAS. The multi-objective search algorithm NSGA-II is used as the search strategy of HARNAS. To make a trade-off between the performance and computation speed of a...
Source: Sensors - October 19, 2021 Category: Biotechnology Authors: Xiaojuan Wang Xinlei Wang Tianqi Lv Lei Jin Mingshu He Tags: Article Source Type: research

Sensors, Vol. 22, Pages 4382: Analysis of the Conflict between Car Commuter & rsquo;s Route Choice Habitual Behavior and Traffic Information Search Behavior
Sensors, Vol. 22, Pages 4382: Analysis of the Conflict between Car Commuter’s Route Choice Habitual Behavior and Traffic Information Search Behavior Sensors doi: 10.3390/s22124382 Authors: Kai Liu Motivated by the conflict between travelers’ habitual choice behavior and traffic information search behavior, in this paper, a behavioral experiment under different types of traffic information (i.e., per-trip traffic information and en-route traffic information) was designed to obtain data regarding car commuters’ daily route choices. Based on the observed data, participants&amp...
Source: Sensors - June 9, 2022 Category: Biotechnology Authors: Kai Liu Tags: Article Source Type: research

Sensors, Vol. 23, Pages 4124: A Multi-Strategy Improved Sparrow Search Algorithm for Coverage Optimization in a WSN
ihang Zhu To address the problems of low monitoring area coverage rate and the long moving distance of nodes in the process of coverage optimization in wireless sensor networks (WSNs), a multi-strategy improved sparrow search algorithm for coverage optimization in a WSN (IM-DTSSA) is proposed. Firstly, Delaunay triangulation is used to locate the uncovered areas in the network and optimize the initial population of the IM-DTSSA algorithm, which can improve the convergence speed and search accuracy of the algorithm. Secondly, the quality and quantity of the explorer population in the sparrow search algorithm are optimiz...
Source: Sensors - April 20, 2023 Category: Biotechnology Authors: Hui Chen Xu Wang Bin Ge Tian Zhang Zihang Zhu Tags: Article Source Type: research

Sensors, Vol. 23, Pages 7398: Multi-UAV Collaborative Search and Attack Mission Decision-Making in Unknown Environments
ng Fu To address the challenge of coordinated combat involving multiple UAVs in reconnaissance and search attacks, we propose the Multi-UAV Distributed Self-Organizing Cooperative Intelligence Surveillance and Combat (CISCS) strategy. This strategy employs distributed control to overcome issues associated with centralized control and communication difficulties. Additionally, it introduces a time-constrained formation controller to address the problem of unstable multi-UAV formations and lengthy formation times. Furthermore, a multi-task allocation algorithm is designed to tackle the issue of allocating multiple tasks t...
Source: Sensors - August 24, 2023 Category: Biotechnology Authors: Zibin Liang Qing Li Guodong Fu Tags: Article Source Type: research

Sensors, Vol. 17, Pages 2823: Parameter Search Algorithms for Microwave Radar-Based Breast Imaging: Focal Quality Metrics as Fitness Functions
™Halloran Inaccurate estimation of average dielectric properties can have a tangible impact on microwave radar-based breast images. Despite this, recent patient imaging studies have used a fixed estimate although this is known to vary from patient to patient. Parameter search algorithms are a promising technique for estimating the average dielectric properties from the reconstructed microwave images themselves without additional hardware. In this work, qualities of accurately reconstructed images are identified from point spread functions. As the qualities of accurately reconstructed microwave images are similar to the...
Source: Sensors - December 6, 2017 Category: Biotechnology Authors: Declan O ’Loughlin B árbara Oliveira Muhammad Elahi Martin Glavin Edward Jones Milica Popovi ć Martin O ’Halloran Tags: Article Source Type: research

Sensors, Vol. 18, Pages 3047: New Multi-Keyword Ciphertext Search Method for Sensor Network Cloud Platforms
ong Zhang This paper proposed a multi-keyword ciphertext search, based on an improved-quality hierarchical clustering (MCS-IQHC) method. MCS-IQHC is a novel technique, which is tailored to work with encrypted data. It has improved search accuracy and can self-adapt when performing multi-keyword ciphertext searches on privacy-protected sensor network cloud platforms. Document vectors are first generated by combining the term frequency-inverse document frequency (TF-IDF) weight factor and the vector space model (VSM). The improved quality hierarchical clustering (IQHC) algorithm then generates document vectors, document ...
Source: Sensors - September 12, 2018 Category: Biotechnology Authors: Lixia Xie Ziying Wang Yue Wang Hongyu Yang Jiyong Zhang Tags: Article Source Type: research

Sensors, Vol. 18, Pages 3274: A Joint Low-Power Cell Search and Frequency Tracking Scheme in NB-IoT Systems for Green Internet of Things
We present an NPSS detection method whose timing metric is composed of symbol-wise autocorrelation and a dedicated normalization factor. After the detection of NPSS, the symbol timing and fractional frequency offset estimation is implemented in a resource-efficient way. NSSS detection is conducted in the frequency domain with a calculation-reduced algorithm based on the features of NSSS sequences. To compensate the accumulated frequency offset during uplink transmission, a pilot-aided rapid frequency tracking algorithm is proposed. The simulation results of the proposed cell search scheme are outstanding in both normal cov...
Source: Sensors - September 29, 2018 Category: Biotechnology Authors: Yu Li Shuo Chen Wenqiang Ye Fujiang Lin Tags: Article Source Type: research

Sensors, Vol. 19, Pages 1551: A Multi-Feature Search Window Method for Road Boundary Detection Based on LIDAR Data
Guo In order to improve the accuracy of structured road boundary detection and solve the problem of the poor robustness of single feature boundary extraction, this paper proposes a multi-feature road boundary detection algorithm based on HDL-32E LIDAR. According to the road environment and sensor information, the former scenic cloud data is extracted, and the primary and secondary search windows are set according to the road geometric features and the point cloud spatial distribution features. In the search process, we propose the concept of the largest and smallest cluster points set and a two-way search method. Fi...
Source: Sensors - March 29, 2019 Category: Biotechnology Authors: Li Shao Guo Tags: Article Source Type: research

Sensors, Vol. 19, Pages 1758: Intelligent Beetle Antennae Search for UAV Sensing and Avoidance of Obstacles
Dechao Chen Based on a bio-heuristic algorithm, this paper proposes a novel path planner called obstacle avoidance beetle antennae search (OABAS) algorithm, which is applied to the global path planning of unmanned aerial vehicles (UAVs). Compared with the previous bio-heuristic algorithms, the algorithm proposed in this paper has advantages of a wide search range and breakneck search speed, which resolves the contradictory requirements of the high computational complexity of the bio-heuristic algorithm and real-time path planning of UAVs. Besides, the constraints used by the proposed algorithm satisfy various charact...
Source: Sensors - April 11, 2019 Category: Biotechnology Authors: Qing Wu Xudong Shen Yuanzhe Jin Zeyu Chen Shuai Li Ameer Hamza Khan Dechao Chen Tags: Article Source Type: research

Sensors, Vol. 19, Pages 2727: Optimized PID Controller Based on Beetle Antennae Search Algorithm for Electro-Hydraulic Position Servo Control System
o Sun To improve the controllability of an electro-hydraulic position servo control system while simultaneously enhancing the anti-jamming ability of a PID controller, a compound PID controller that combines the beetle antennae search algorithm with PID strategy was proposed, and used to drive the position servo control system of the electro-hydraulic servo system. A BAS-PID controller was designed, and the beetle antennae search algorithm was used to tune PID parameters so that the disturbance signal of the system was effectively restrained. Initially, the basic mathematical model of the electro-hydraulic position ser...
Source: Sensors - June 17, 2019 Category: Biotechnology Authors: Yuqi Fan Junpeng Shao Guitao Sun Tags: Article Source Type: research

Sensors, Vol. 20, Pages 3962: The Impact of the Improved Search Object Detection on the SAR Action Success Probability in Maritime Transport
Januszko This paper presents the investigations on the improvement of search object detection during search and rescue (SAR) action at sea using thermal imaging and radar sensors. The introduction of new materials in the construction of lifesaving appliances increasing their detectability has been studied for the selected example of a pneumatic life raft. The research was based on laboratory tests and open sea trials. The presented experimental investigations on the new materials that can be used for pneumatic life raft construction showed the enhancement of its thermal and radar signatures, which directly affect life...
Source: Sensors - July 15, 2020 Category: Biotechnology Authors: Zbigniew Burciu Teresa Abramowicz-Gerigk Wojciech Przybyl Ireneusz Plebankiewicz Adam Januszko Tags: Article Source Type: research