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Search Results (2,868)

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15 pages, 2204 KiB  
Article
On the Functional Nature of Cognitive Systems
by Vincenzo Manca
Information 2024, 15(12), 807; https://doi.org/10.3390/info15120807 (registering DOI) - 16 Dec 2024
Viewed by 290
Abstract
The functional nature of cognitive systems is outlined as a general conceptual model where typical notions of cognition are analyzed apart from the physical realization (biological or artificial) of such systems. The notion of function, one of the main logical bases of mathematics, [...] Read more.
The functional nature of cognitive systems is outlined as a general conceptual model where typical notions of cognition are analyzed apart from the physical realization (biological or artificial) of such systems. The notion of function, one of the main logical bases of mathematics, logic, linguistics, physics, and computer science, is shown to be a unifying concept in analyzing cognition components: learning, meaning, comprehension, language, knowledge, and consciousness are related to increasing levels in the functional organization of cognition. Full article
(This article belongs to the Section Information Applications)
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<p>A graph representation of the above FN expressed by a system of equations.</p>
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<p>FN holomorphy. Top: three weighted functions (bullets receive inputs and rectangles represent weights). Bottom: an FN is obtained by connecting the functions on the top, which provides a weighted function of the same kind as a single connected elements.</p>
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<p>An FN on top and its integration with learning FN on bottom. Integration is represented at two levels, employing a reverse network of nodes that are arrow bridges of original FN.</p>
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<p>An FN and a meta-function K adjusting a weight according to an input error (between the computed function and a target function).</p>
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<p>The translation of the meta-function K into a function providing the same effect according to a bridge mechanism.</p>
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<p>The inputs I1, I2, and I3 of F-G-H are sent to the FN with six Id functions (Id is the identity), where three meta-functions update three weights. When input 1 is given to the synapses on the bottom, G sends to F the same value generated by I1, I2, and I3. In other words, the FN on the bottom memorizes inputs of F-G-H as weights (those between the pairs of Id functions). This representation individuates a memory mechanism transforming input values into weights, where meta-functions are essential (weights indicated by slim rectangles have value 1).</p>
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29 pages, 4342 KiB  
Article
Determining Factors Affecting Agroecological Practices’ Acceptance and Use in Mali, West Africa
by Moumouni Sidibé, Afio Zannou, Idelphonse O. Saliou, Issa Sacko, Augustin K. N. Aoudji, Achille Ephrem Assogbadjo, Harouna Coulibaly and Bourema Koné
Sustainability 2024, 16(24), 11002; https://doi.org/10.3390/su162411002 - 15 Dec 2024
Viewed by 281
Abstract
Land degradation issues and declining fertility are driving the need for agroecological practices. This research analysed the determinants of acceptance and actual use of five main agroecological practices (contour farming techniques, organic fertiliser, crop association, improved seeds and integrated crop management practices) by [...] Read more.
Land degradation issues and declining fertility are driving the need for agroecological practices. This research analysed the determinants of acceptance and actual use of five main agroecological practices (contour farming techniques, organic fertiliser, crop association, improved seeds and integrated crop management practices) by farmers in Mali. The extended Unified Theory of Acceptance and Use of Technology (UTAUT) was used to develop the conceptual model. Data were collected from 505 randomly selected farming households in the cotton and cereal production zones in Mali. Partial Least Square–Structural Equation Modelling (PLS-SEM) was used to estimate technology acceptance and use. The findings revealed that behavioural intention is significantly and positively influenced by the expected performance and social influence. The expected effort is a key influential factor of the behavioural intention to adopt organic fertiliser. Experience has a mediating effect on the relationship between social influence and behavioural intention to adopt improved seeds adapted to the agroecological conditions. The actual use behaviour is directly and positively affected by the behavioural intention, facilitating conditions and expected net benefit. These findings align with the UTAUT model, have useful implications for both farmers and decision-makers and offer directions for technical approaches to agroecological practices’ development. Full article
(This article belongs to the Special Issue Sustainable Crop Production and Agricultural Practices)
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<p>Latent variables influencing the adoption of agroecological practices. Source: Adapted from [<a href="#B15-sustainability-16-11002" class="html-bibr">15</a>].</p>
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<p>Locations of the communes of Cinzana (<b>left</b>) and Kléla (<b>right</b>).</p>
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<p>Contour farming technique path coefficient results with original UTAUT (<b>a</b>) and extended UTAUT (<b>b</b>) models. *** <span class="html-italic">p</span> &lt; 0.01.</p>
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<p>Organic fertiliser path coefficient results with original UTAUT (<b>a</b>) and extended UTAUT (<b>b</b>) models. *** <span class="html-italic">p</span> &lt; 0.01, ** <span class="html-italic">p</span> &lt; 0.05.</p>
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<p>Crop association path coefficient results with original UTAUT model (<b>a</b>) and extended UTAUT model (<b>b</b>). *** <span class="html-italic">p</span> &lt; 0.01.</p>
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<p>ISEED-AE path coefficient results with original UTAUT model (<b>a</b>) and extended UTAUT model (<b>b</b>). *** <span class="html-italic">p</span> &lt; 0.01, ** <span class="html-italic">p</span> &lt; 0.05.</p>
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<p>Integrated crop management path coefficient results with original UTAUT (<b>a</b>) and extended UTAUT (<b>b</b>) models. *** <span class="html-italic">p</span> &lt; 0.01, ** <span class="html-italic">p</span> &lt; 0.05.</p>
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27 pages, 6729 KiB  
Article
Shear Fragility Analysis of Non-Classically Damped Three-Dimensional Structures Under Seismic Excitation
by Jinghui Wang, Ping Tan, Tiancan Huang, Xuefeng He and Fulin Zhou
Buildings 2024, 14(12), 3967; https://doi.org/10.3390/buildings14123967 - 13 Dec 2024
Viewed by 320
Abstract
This study proposes a seismic performance evaluation method for structures using the base shear index to calculate the collapse probability. After non-proportional damping was applied to the three-dimensional bar system model, the structural dynamic response was computed through large-scale finite element analysis. A [...] Read more.
This study proposes a seismic performance evaluation method for structures using the base shear index to calculate the collapse probability. After non-proportional damping was applied to the three-dimensional bar system model, the structural dynamic response was computed through large-scale finite element analysis. A three-dimensional matrix element for calculating viscous dampers was established in this study. The viscous unified elastoplastic (VUEL) damper element program was compiled using the Fortran language into the ABAQUS 6.14 software. An incremental dynamic analysis (IDA) routine was developed using Python 3.0 within the environment of ABAQUS. The uncontrolled structure was designed using the forced decoupling response spectrum method (FD-RSM), while the damped structure was designed using the complex modal response spectrum method (CM-RSM). Seismic fragility analysis was conducted on both uncontrolled and damped structures using the recommended far-field and near-field earthquake records from ATC-63 FEMAP-695. The shear-based fragility index and collapse probability were investigated to comprehensively assess the seismic performance of the uncontrolled and damped structures. The analysis results indicated that the ratios of the limit performance states for moderate damage (IO), severe damage (LS), and complete damage (CP) in the structure were 1:1.6:2.6. Compared with the various limit performance states of the uncontrolled structures, the increments in the moderate, severe, and complete damage limit performance states of the damped structures were 12.79%, 14.86%, and 16.97%, respectively. Full article
(This article belongs to the Section Building Structures)
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<p>Three-dimensional finite element models for structures.</p>
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<p>MAXWELL model.</p>
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<p>The process of ABAQUS subroutine development.</p>
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<p>Finite element structural model in ABAQUS.</p>
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<p>Viscous damper.</p>
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<p>Seismic records set for FEMA P-695 in ATC-63.</p>
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<p>Seismic records set for FEMA P-695 in ATC-63.</p>
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<p>Complex modal analysis.</p>
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<p>IDA curve of structural shear force.</p>
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<p>Seismic probability demand of structural base shear.</p>
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<p>Seismic probability demand of structural drift.</p>
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<p>Fragility curves of structural drift index at different peak ground accelerations (PGAs).</p>
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<p>Fragility curves of base shear index for different peak ground accelerations (PGA) in structures.</p>
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<p>Damage probability of structural drift index under different performance levels.</p>
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<p>Damage probability of structural base shear index under different performance levels.</p>
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<p>Comparison of median values of fragility functions for different structural shear forces.</p>
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<p>Comparison of standard deviations of fragility functions for different structural shear forces.</p>
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10 pages, 958 KiB  
Article
A Unified Semiconductor-Device-Physics-Based Ballistic Model for the Threshold Voltage of Modern Multiple-Gate Metal-Oxide-Semiconductor Field-Effect-Transistors
by Te-Kuang Chiang
Electron. Mater. 2024, 5(4), 321-330; https://doi.org/10.3390/electronicmat5040020 - 13 Dec 2024
Viewed by 277
Abstract
Based on the minimum conduction band edge caused by the minimum channel potential resulting from the quasi-3D scaling theory and the 3D density of state (DOS) accompanied by the Fermi–Dirac distribution function on the source and drain sides, a unified semiconductor-device-physics-based ballistic model [...] Read more.
Based on the minimum conduction band edge caused by the minimum channel potential resulting from the quasi-3D scaling theory and the 3D density of state (DOS) accompanied by the Fermi–Dirac distribution function on the source and drain sides, a unified semiconductor-device-physics-based ballistic model is developed for the threshold voltage of modern multiple-gate (MG) transistors, including FinFET, Ω-gate MOSFET, and nanosheet (NS) MOSFET. It is shown that the thin silicon, thin gate oxide, and high work function will alleviate ballistic effects and resist threshold voltage degradation. In addition, as the device dimension is further reduced to give rise to the 2D/1D DOS, the lowest conduction band edge is increased to resist threshold voltage degradation. The nanosheet MOSFET exhibits the largest threshold voltage among the three transistors due to the smallest minimum conduction band edge caused by the quasi-3D minimum channel potential. When the n-type MOSFET (N-FET) is compared to the P-type MOSFET (P-FET), the P-FET shows more threshold voltage because the hole has a more effective mass than the electron. Full article
(This article belongs to the Special Issue Metal Oxide Semiconductors for Electronic Applications)
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<p>Typical schematic of the 3D modern multiple-gate MOSFETs composed of (<b>A</b>) nanosheet (NS) MOSFET, (<b>B</b>) Ω-gate MOSFET, and (<b>C</b>) FinFET. The channel direction is along the z-axis. The channel length, height, and width are denoted by <span class="html-italic">L<sub>g</sub></span>, <span class="html-italic">H</span>, and <span class="html-italic">W</span>, respectively. The gate oxide thickness is denoted by <span class="html-italic">t<sub>ox</sub></span>. <span class="html-italic">W<sub>o</sub></span> is the opening of the bottom oxide in the Ω-gate MOSFET.</p>
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<p>Threshold voltage versus channel length for different silicon thicknesses of FinFET.</p>
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<p>Threshold voltage versus channel length for different gate oxide thicknesses of Ω-gate MOSFET.</p>
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<p>Threshold voltage versus channel length for different work functions of nanosheet MOSFET.</p>
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<p>Threshold voltage versus channel length for different dimensionalities of FinFET.</p>
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<p>Threshold voltage versus channel length for different MG FETs, including FinFET, Ω-gate MOSFET, and nanosheet MOSFET.</p>
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<p>Threshold voltage versus scaling factor for silicon/oxide thickness combinations of FinFET.</p>
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27 pages, 7948 KiB  
Article
SSUM: Spatial–Spectral Unified Mamba for Hyperspectral Image Classification
by Song Lu, Min Zhang, Yu Huo, Chenhao Wang, Jingwen Wang and Chenyu Gao
Remote Sens. 2024, 16(24), 4653; https://doi.org/10.3390/rs16244653 (registering DOI) - 12 Dec 2024
Viewed by 312
Abstract
How to effectively extract spectral and spatial information and apply it to hyperspectral image classification (HSIC) has been a hot research topic. In recent years, the transformer-based HSIC models have attracted much interest due to their advantages in long-distance modeling of spatial and [...] Read more.
How to effectively extract spectral and spatial information and apply it to hyperspectral image classification (HSIC) has been a hot research topic. In recent years, the transformer-based HSIC models have attracted much interest due to their advantages in long-distance modeling of spatial and spectral features in hyperspectral images (HSIs). However, the transformer-based method suffers from high computational complexity, especially in HSIC tasks that require processing large amounts of data. In addition, the spatial variability inherent in HSIs limits the performance improvement of HSIC. To handle these challenges, a novel Spectral–Spatial Unified Mamba (SSUM) model is proposed, which introduces the State Space Model (SSM) into HSIC tasks to reduce computational complexity and improve model performance. The SSUM model is composed of two branches, i.e., the Spectral Mamba branch and the Spatial Mamba branch, designed to extract the features of HSIs from both spectral and spatial perspectives. Specifically, in the Spectral Mamba branch, a nearest-neighbor spectrum fusion (NSF) strategy is proposed to alleviate the interference caused by the spatial variability (i.e., same object having different spectra). In addition, a novel sub-spectrum scanning (SS) mechanism is proposed, which scans along the sub-spectrum dimension to enhance the model’s perception of subtle spectral details. In the Spatial Mamba branch, a Spatial Mamba (SM) module is designed by combining a 2D Selective Scan Module (SS2D) and Spatial Attention (SA) into a unified network to sufficiently extract the spatial features of HSIs. Finally, the classification results are derived by uniting the output feature of the Spectral Mamba and Spatial Mamba branch, thus improving the comprehensive performance of HSIC. The ablation studies verify the effectiveness of the proposed NSF, SS, and SM. Comparison experiments on four public HSI datasets show the superior of the proposed SSUM. Full article
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Graphical abstract
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<p>(<b>a</b>) The overall architecture of the proposed SSUM, including (<b>b</b>) Spatial Mamba; (<b>c</b>) nearest-neighbor spectrum fusion (NSF) strategy; (<b>d</b>) sub-spectrum scanning (SS) mechanism; and (<b>e</b>) 2D Selective Scan Module (SS2D). Specifically, (<b>a</b>) denotes the overall architecture of the SSUM; (<b>b</b>) denotes the Spatial Mamba, which corresponds to the Spatial Mamba in (<b>a</b>); (<b>c</b>) denotes the nearest-neighbor spectrum fusion (NSF) strategy, which corresponds to the NSF in (<b>a</b>); (<b>d</b>) denotes the sub-spectrum scanning (SS) mechanism, which corresponds to the SS in (<b>a</b>); (<b>e</b>) denotes the 2D selective scan module (SS2D), which corresponds to the SS2D in (<b>b</b>).</p>
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<p>Improved Spatial Attention mechanism applied to this method.</p>
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<p>Indian Pines dataset. (<b>a</b>) False-color map. (<b>b</b>) Ground truth.</p>
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<p>Pavia University dataset. (<b>a</b>) False-color map. (<b>b</b>) Ground truth.</p>
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<p>Salinas Valley dataset. (<b>a</b>) False-color map. (<b>b</b>) Ground truth.</p>
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<p>WHU-Hi-Long Kou dataset. (<b>a</b>) False-color map. (<b>b</b>) Ground truth.</p>
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<p>Classification maps produced by various methods applied to the Indian Pines dataset: (<b>a</b>) false-color map, (<b>b</b>) ground truth, (<b>c</b>) KNN, (<b>d</b>) RF, (<b>e</b>) 1DCNN, (<b>f</b>) 2DCNN, (<b>g</b>) HybridSN, (<b>h</b>) IRTS-3DCNN, (<b>i</b>) CasRNN, (<b>j</b>) ViT, (<b>k</b>) SpectralFormer, (<b>l</b>) GraphGST, (<b>m</b>) SS-Mamba, and (<b>n</b>) SSUM.</p>
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<p>Classification maps produced by various methods applied to the Pavia University dataset: (<b>a</b>) false-color map, (<b>b</b>) ground truth, (<b>c</b>) KNN, (<b>d</b>) RF, (<b>e</b>) 1DCNN, (<b>f</b>) 2DCNN, (<b>g</b>) HybridSN, (<b>h</b>) IRTS-3DCNN, (<b>i</b>) CasRNN, (<b>j</b>) ViT, (<b>k</b>) SpectralFormer, (<b>l</b>) GraphGST, (<b>m</b>) SS-Mamba, and (<b>n</b>) SSUM.</p>
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<p>Classification maps produced by various methods applied to the Salinas Valley dataset: (<b>a</b>) false-color map, (<b>b</b>) ground truth, (<b>c</b>) KNN, (<b>d</b>) RF, (<b>e</b>) 1DCNN, (<b>f</b>) 2DCNN, (<b>g</b>) HybridSN, (<b>h</b>) IRTS-3DCNN, (<b>i</b>) CasRNN, (<b>j</b>) ViT, (<b>k</b>) SpectralFormer, (<b>l</b>) GraphGST, (<b>m</b>) SS-Mamba, and (<b>n</b>) SSUM.</p>
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<p>Classification maps produced by various methods applied to the WHU-Hi-LongKou dataset: (<b>a</b>) false-color map, (<b>b</b>) ground truth, (<b>c</b>) KNN, (<b>d</b>) RF, (<b>e</b>) 1DCNN, (<b>f</b>) 2DCNN, (<b>g</b>) HybridSN, (<b>h</b>) IRTS-3DCNN, (<b>i</b>) CasRNN, (<b>j</b>) ViT, (<b>k</b>) SpectralFormer, (<b>l</b>) GraphGST, (<b>m</b>) SS-Mamba, and (<b>n</b>) SSUM.</p>
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<p>Impacts of the different parameters for the proposed SSUM. (<b>a</b>) Impact of the neighborhood size. (<b>b</b>) Impact of the patch size. (<b>c</b>) Impact of the sub-spectrum length. (<b>d</b>) Impact of the number of bands after PCA.</p>
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<p>Classification map detail analysis. (<b>a</b>) Salinas Valley classified by GraphGST. (<b>b</b>) Salinas Valley classified by SSUM. (<b>c</b>) Long Kou classified by GraphGST. (<b>d</b>) Long Kou classified by SSUM.</p>
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25 pages, 25344 KiB  
Article
Identifying Priority Conservation Areas in Shennongjia National Park Based on Monetary Costs and Zonation Model
by Weixuan Ding, Liangyi Huang, Jirong Guang and Jingya Zhang
Land 2024, 13(12), 2164; https://doi.org/10.3390/land13122164 - 12 Dec 2024
Viewed by 303
Abstract
Identifying priority conservation areas (PCAs) for national parks is critical for improving the cost-effectiveness and viability of conservation efforts, given the multiplicity of conservation values, the complexity of human activities, and the limited financial resources available. Assessing conservation costs is central to systematic [...] Read more.
Identifying priority conservation areas (PCAs) for national parks is critical for improving the cost-effectiveness and viability of conservation efforts, given the multiplicity of conservation values, the complexity of human activities, and the limited financial resources available. Assessing conservation costs is central to systematic conservation planning (SCP). To compensate for the limitations of the alternative cost method in small-scale case studies and accurately reflect the cost differences due to specific land use, tenure, and management strategies, conservation costs are quantified and spatialized in this study using monetization methods. Taking Shennongjia National Park (SNP) as an example, we considered the core conservation values of species, ecosystems, and geological heritage, using the Zonation 5 model to identify PCAs under three different targets: 17%, 30%, and 50%. The results indicated that, as the conservation targets increased, PCAs expanded from the central and southern high-altitude areas to the northwest and northeast. Conservation gaps are primarily concentrated in the western part of Songluo and the northern parts of Hongping and Songba. Conservation costs exhibit clear spatial heterogeneity, increasing gradually from the central high mountains towards the surrounding areas. Among these, ecological compensation cost was the primary factor driving the sharp increase in total costs, while opportunity cost remained consistently low with minimal fluctuations. Compared to the alternative method, our study clarified the spatial distribution and types of costs in the process of national park construction, providing a quantitative basis and scientific guidance for future fiscal investment directions, methods, and responsible entities. At the administrative division level, we revealed the main cost challenges faced by townships in balancing resource conservation with community development, leading to more targeted, timely, and actionable community governance strategies. These findings further illustrate the significant advantages of using monetary costs in optimizing the boundaries of individual national parks and enhancing funding allocation efficiency, while promoting effective unified management of natural resource assets within spatial planning. Full article
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<p>Location of the study area, land use, and distribution of nature reserves.</p>
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<p>Workflow for identifying PCAs under different targets.</p>
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<p>Distribution of habitat suitability and species conservation importance of 13 representative species in the study area. (<b>a</b>) Sichuan snub-nosed monkey; (<b>b</b>) golden leopard; (<b>c</b>) jackal; (<b>d</b>) black bear; (<b>e</b>) forest musk deer; (<b>f</b>) white-shouldered eagle; (<b>g</b>) white-crested long-tailed pheasant; (<b>h</b>) ginkgo; (<b>i</b>) Chinese yew; (<b>j</b>) dove tree; (<b>k</b>) light-leaved dove tree; (<b>l</b>) Qinling fir; (<b>m</b>) bashan torreya; (<b>n</b>) species conservation importance.</p>
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<p>Distribution of ecosystem conservation importance in the study area. (<b>a</b>) Ecosystem type values; (<b>b</b>) ecosystem service values; (<b>c</b>) WY, SR, CS, and HQ.</p>
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<p>Distribution of geological heritage conservation importance.</p>
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<p>Spatial distribution of conservation costs. (<b>a</b>) OC; (<b>b</b>) ECC; (<b>c</b>) total conservation costs.</p>
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<p>PCAs, conservation costs, and features coverage of SNP under different conservation targets.</p>
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<p>Conservation gap analysis under different conservation targets. (<b>a</b>) Areas of overlap and gaps; (<b>b</b>) area statistics of overlap and gap areas.</p>
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<p>Analysis of changes in conservation costs under different targets. (<b>a</b>) Growth rates of various conservation costs, average coverage; (<b>b</b>) proportion of each type of OC and ECC.</p>
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<p>Statistics on OC and ECC of each township under different targets.</p>
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17 pages, 14527 KiB  
Article
Niche Expansion Has Increased the Risk of Leptocybe invasa Fisher Et LaSalle Invasions at the Global Scale
by Xianheng Ouyang, Jiangling Pan, Hui Rao and Qiaoyun Sun
Insects 2024, 15(12), 985; https://doi.org/10.3390/insects15120985 - 12 Dec 2024
Viewed by 408
Abstract
Invasive alien species often undergo shifts in their ecological niches when they establish themselves in environments that differ from their native habitats. Leptocybe invasa Fisher et LaSalle (Hymenoptera: Eulophidae), specifically, has caused huge economic losses to Eucalyptus trees in Australia. The global spread [...] Read more.
Invasive alien species often undergo shifts in their ecological niches when they establish themselves in environments that differ from their native habitats. Leptocybe invasa Fisher et LaSalle (Hymenoptera: Eulophidae), specifically, has caused huge economic losses to Eucalyptus trees in Australia. The global spread of eucalyptus cultivation has allowed L. invasa to threaten plantations beyond its native habitat. It is, therefore, urgent to implement effective control measures to mitigate the impact of this pest. The optimized MaxEnt model was used to predict the potential global distribution of L. invasa based on occurrence data and environmental variables. The centroid shift, overlap, unfilling, and expansion (COUE) framework was employed to evaluate niche dynamics during the global invasion process by comparing the ecological niches of L. invasa in both native regions and regions affected by invasions (hereafter referred to as “invaded”). The results indicated that the distribution of L. invasa is primarily influenced by temperature, precipitation, and the human influence index variables. Its ecological niche was shown to have considerably expanded from native to invaded regions. Under future climate scenarios, the potential geographical distribution of L. invasa is projected to be concentrated primarily in East Asia, Southeast Asia, Western Europe, and Southern Oceania. In the future, the potentially suitable areas for the establishment of L. invasa are expected to further expand. This study provides a unified framework for exploring the niche dynamics of invasive alien species globally. Emphasizing early warning and control in uninvaded areas is crucial for minimizing L. invasa ecological and economic threats. Full article
(This article belongs to the Section Insect Systematics, Phylogeny and Evolution)
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<p>The occurrence records of <span class="html-italic">Leptocybe invasa</span> around the world.</p>
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<p>Delta AICc values of candidate models for <span class="html-italic">Leptocybe invasa</span>. (<b>a</b>) based on bioclimatic variables and occurrence records worldwide; (<b>b</b>) based on bioclimatic variables and occurrence records in the native range; (<b>c</b>) based on bioclimatic variables and occurrence records in the invasive range; (<b>d</b>) AUC values of the optimal model at the global scale; (<b>e</b>) AUC values of the optimal model in the native range; (<b>f</b>) AUC values of the optimal model in the invasive range.</p>
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<p>Contributions of environmental variables affecting the distribution of <span class="html-italic">Leptocybe invasa</span>. (<b>a</b>) and the response curves of important environmental variables (<b>b</b>–<b>d</b>). bio5: maximum temperature of the warmest month, bio6: minimum temperature of the coldest month, and HII: human influence index.</p>
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<p>Niche overlap, similarity tests, and rates of contribution of bioclimatic variables between the native and invasive ranges of <span class="html-italic">Leptocybe invasa</span>. (<b>a</b>) Niche overlap; (<b>b</b>) contribution rates of environmental variables; (<b>c</b>,<b>d</b>) niche similarity tests. Histograms represent the null distribution of <span class="html-italic">D</span> obtained from 1000 iterations, which were compared to the observed Schoener’s <span class="html-italic">D</span> metric (red diamond) to assess niche similarity based on the tests comparing native to invasive (<b>c</b>) and invasive to native (<b>d</b>) ranges.</p>
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<p>Predicted niche occupancy profiles based on the environmental variables incorporated in the models. bio2: Mean diurnal range, bio5: maximum temperature of the warmest month, bio6: minimum temperature of the coldest month, bio12: annual precipitation, bio14: Precipitation of the driest month, bio15: precipitation seasonality, altitude, and HII: human influence index. The green and red lines represent the density of occurrence of native and invasive ranges, respectively.</p>
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<p>Potentially suitable areas for <span class="html-italic">Leptocybe invasa</span> at the global scale under near-current climate conditions based on global, native and invasive occurrence records.</p>
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<p>Potential geographical distribution of <span class="html-italic">Leptocybe invasa</span> under future climate scenarios (2030s and 2050s).</p>
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<p>Changes in the potentially suitable areas for <span class="html-italic">Leptocybe invasa</span> at the global scale under future climate scenarios (2030s and 2050s).</p>
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27 pages, 7093 KiB  
Article
Integration of Visible Light Communication, Artificial Intelligence, and Rerouting Strategies for Enhanced Urban Traffic Management
by Manuela Vieira, Gonçalo Galvão, Manuel A. Vieira, Mário Véstias, Pedro Vieira and Paula Louro
Vehicles 2024, 6(4), 2106-2132; https://doi.org/10.3390/vehicles6040103 - 11 Dec 2024
Viewed by 430
Abstract
This study combines Visible Light Communication (VLC) and Artificial Intelligence (AI) to enhance traffic signal control, reduce congestion, and improve safety, through real-time monitoring and dynamic traffic management. Leveraging VLC technology, the system uses existing road infrastructure to transmit live data on vehicle [...] Read more.
This study combines Visible Light Communication (VLC) and Artificial Intelligence (AI) to enhance traffic signal control, reduce congestion, and improve safety, through real-time monitoring and dynamic traffic management. Leveraging VLC technology, the system uses existing road infrastructure to transmit live data on vehicle and pedestrian positions, speeds, and queues. AI agents, employing Deep Reinforcement Learning (DRL), process this data to manage traffic flows dynamically, applying anti-bottleneck and rerouting techniques to balance pedestrian and vehicle waiting times. A centralized global agent coordinates the local agents controlling each intersection, enabling indirect communication and data sharing to train a unified DRL model. This model makes real-time adjustments to traffic light phases, utilizing a queue/request/response system for adaptive intersection management. Tested using simulations and real-world trials involving standard and rerouting scenarios, the approach demonstrates significantly better performance in regard to the rerouting configuration, reducing congestion and enhancing traffic flow and pedestrian safety. Scalable and adaptable to various intersection types, including four-way, T-intersections, and roundabouts, the system’s efficacy is validated using the SUMO urban mobility simulator, resulting in notable reductions to travel and waiting times for both vehicles and pedestrians. Full article
(This article belongs to the Special Issue Novel Solutions for Transportation Safety)
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<p>(<b>a</b>) A 2D representation of the V-VLC architecture. (<b>b</b>) V-VLC emitter and receivers’ relative position and an illustration of the coverage map, with the footprint regions in the unit cell (#1–#9) and the steering angle codes (2–9) [<a href="#B22-vehicles-06-00103" class="html-bibr">22</a>].</p>
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<p>(<b>a</b>) Environment scenario; (<b>b</b>) simulated scenario for each junction: four-legged intersection and an environment with the optical infrastructure (X<sub>ij</sub>), the generated footprints (#1–#9), and the connected cars and pedestrians.</p>
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<p>(<b>a</b>) Environment scenario; (<b>b</b>) simulated scenario for each junction: four-legged intersection and an environment with the optical infrastructure (X<sub>ij</sub>), the generated footprints (#1–#9), and the connected cars and pedestrians.</p>
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<p>(<b>a</b>) Schematic diagram of one junction with coded lanes (L/0–7) and traffic lights (TL/0–15). (<b>b</b>) Phase diagram with the traffic directions [<a href="#B22-vehicles-06-00103" class="html-bibr">22</a>].</p>
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<p>Simulated VLC in a two junction (C0 and C1) scenario, involving RGBV ID transmitters.</p>
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<p>Normalized MUX signal responses and the corresponding decoded messages, displayed at the top, sent by the IM to: (<b>a</b>) the vehicles. (<b>b</b>) pedestrians waiting at the corners (I2P1,2) for various frame times. On the right-hand side, the analyzed communication type is displayed to assist visual interpretation.</p>
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<p>Flowchart during simulation and training.</p>
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<p>A schematic diagram of the algorithm employed, using centralized MARL.</p>
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<p>A schematic diagram of the representation state for each junction.</p>
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<p>Network training for both scenarios: (<b>a</b>) cumulative negative rewards and (<b>b</b>) average queue size.</p>
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<p>Comparison of trends over time for vehicle halting sessions at intersections in standard versus rerouting scenario: (<b>a</b>) intersection C0, (<b>b</b>) intersection C1, and (<b>c</b>) intersection C2.</p>
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<p>Comparison of trends over time for pedestrian halting sessions at intersections in standard versus rerouting scenario: (<b>a</b>) intersection C0, (<b>b</b>) intersection C1, and (<b>c</b>) intersection C2.</p>
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<p>Comparison of trends over time for the active phases (actions) at intersections C0, C1 and C2. (<b>a</b>) Standard scenario. (<b>b</b>) Rerouting scenario.</p>
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<p>Comparison of trends over time for the active phases (actions) at intersections C0, C1 and C2. (<b>a</b>) Standard scenario. (<b>b</b>) Rerouting scenario.</p>
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<p>Time-based comparison of active phases 5 and 1 at intersections C0, C1, and C2: (<b>a</b>) standard scenario and (<b>b</b>) rerouting scenario. The phases and scenarios are shown in the insets.</p>
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<p>Comparison of green time trends across all active phases at intersections C0, C1, and C2. Active phases are indicated at the top for clarity. (<b>a</b>) Standard scenario. (<b>b</b>) Rerouting scenario.</p>
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<p>Comparison of green time trends across all active phases at intersections C0, C1, and C2. Active phases are indicated at the top for clarity. (<b>a</b>) Standard scenario. (<b>b</b>) Rerouting scenario.</p>
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18 pages, 6258 KiB  
Article
A Unified Deflection Theory Model for Multi-Tower Self-Anchored Suspension Bridges with Different Tower–Girder and Cable–Girder Connections
by Shiyu Guan, Dinghui Liao, Yi Zhang, Jun Shi, Shuang Liu and Hongyou Cao
Buildings 2024, 14(12), 3945; https://doi.org/10.3390/buildings14123945 - 11 Dec 2024
Viewed by 334
Abstract
This study presents a unified analytical model for multi-tower self-anchored suspension bridges integrating tower–girder connections (TGCs) and cable–girder connections (CGCs) within the framework of deflection theory. The connections are modeled as horizontal springs, and governing equations are derived based on force equilibrium and [...] Read more.
This study presents a unified analytical model for multi-tower self-anchored suspension bridges integrating tower–girder connections (TGCs) and cable–girder connections (CGCs) within the framework of deflection theory. The connections are modeled as horizontal springs, and governing equations are derived based on force equilibrium and compatibility conditions. A comparison with a nonlinear finite element analysis under various live load scenarios confirms the accuracy of the proposed model. A parametric analysis reveals that increasing the CGC stiffness reduces girder deflection, decreasing the maximum vertical deflection by nearly 42.3% when the stiffness is increased from 0 to infinity and moving the maximum displacement from the mid-span section to the mid-tower section. Additionally, CGCs modify the load distribution between the main cable and the girder, limiting the longitudinal displacement of the tower in which the mid-tower displacement is reduced by 45.50%. Tower–girder connections improve the anchoring of the side cable to the tower. When connection stiffness is low, side- and middle-tower stiffness significantly reduce girder deflection, though this effect decreases with increasing stiffness. Enhancing mid-tower stiffness similarly reduces its longitudinal displacement regardless of the tower–girder connection. In longitudinal floating systems, mid-tower displacement rises with increasing side-tower stiffness. Establishing a unified analysis model reveals the key parameters in the structural analysis of suspension bridges, enabling an easier and faster analysis of multi-tower self-anchored suspension bridges. Full article
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<p>Cable system of suspension bridge with CGCs.</p>
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<p>Different types of CGCs on suspension bridges [<a href="#B32-buildings-14-03945" class="html-bibr">32</a>].</p>
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<p>An analysis of the cable and girder differential element at different stages: (<b>a</b>) the completed stage; (<b>b</b>) the operational stage.</p>
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<p>A schematic of the main girder with longitudinal tower–cable–girder connections.</p>
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<p>Simplified mechanical comparison of suspension bridge with CGCs.</p>
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<p>Mechanical diagram of each tower with TGCs.</p>
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<p>Substitutional beam method for multi-tower self-anchored suspension bridge. (<b>a</b>) Statically indeterminate structure under live load and equivalent dead load. (<b>b</b>) Basic structure under live load. (<b>c</b>) Basic structure under equivalent dead load.</p>
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<p>The structural and load parameters of the numerical model.</p>
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<p>A comparison of the girder deflection computed from the FEM (the dashed line with hollow symbols) and the proposed method (the solid line with filled symbols): (<b>a</b>) LFS; (<b>b</b>) TGC; and (<b>c</b>) CGC.</p>
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<p>A comparison of the girder moment computed from the FEM (the dashed line with hollow symbols) and the proposed method (the solid line with filled symbols): (<b>a</b>) LFS; (<b>b</b>) TGC; and (<b>c</b>) CGC.</p>
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<p>The influence of the CGC stiffness on girder deflection.</p>
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<p>The influence of tower stiffness on structure performance considering different CGC stiffness levels: (<b>a</b>) the maximum deflection of the girder; (<b>b</b>) the longitudinal displacement of the mid-tower section; (<b>c</b>) the longitudinal displacement of the left-side tower.</p>
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<p>The influence of the TGC stiffness on girder deflection.</p>
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<p>The influence of tower stiffness on structure performance considering different TGC stiffness levels: (<b>a</b>) the maximum deflection of the girder; (<b>b</b>) the longitudinal displacement of the mid-tower section; (<b>c</b>) the longitudinal displacement of the left-side tower.</p>
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18 pages, 1075 KiB  
Article
Exploring Technology Acceptance of Healthcare Devices: The Moderating Role of Device Type and Generation
by Seieun Kim, Yinai Zhong, Jue Wang and Hak-Seon Kim
Sensors 2024, 24(24), 7921; https://doi.org/10.3390/s24247921 - 11 Dec 2024
Viewed by 372
Abstract
The increasing adoption of healthcare devices necessitates a deeper understanding of the factors that influence user acceptance in this rapidly evolving area. Therefore, this study examined the factors influencing the technology acceptance of healthcare devices, focusing on radar sensors and wearable devices. A [...] Read more.
The increasing adoption of healthcare devices necessitates a deeper understanding of the factors that influence user acceptance in this rapidly evolving area. Therefore, this study examined the factors influencing the technology acceptance of healthcare devices, focusing on radar sensors and wearable devices. A total of 1158 valid responses were used to test hypotheses, mediation, and moderation effects using SmartPLS 4.0. The results highlighted the significant role of performance expectancy, effort expectancy, social influence, facilitating conditions, and perceived risk in shaping user attitudes and trust, which in turn influence behavioral intention. The findings suggested that attitudes fully mediate the effects of performance expectancy and effort expectancy on behavioral intention, while social influence, facilitating conditions, and perceived risk exhibit partial mediation. Moderation analysis revealed significant effects of generation on the relationship between attitude, trust, and behavioral intention. Additionally, device type moderated the effect of trust on behavioral intention, showing a different influence between radar sensors and wearable devices. These findings provide theoretical contributions by extending the unified theory of acceptance and use of technology (UTAUT) model and offering practical implications for manufacturers and policymakers to tailor strategies that foster positive attitudes, enhance trust, and address generational and device-specific differences in healthcare technology adoption. Full article
(This article belongs to the Section Internet of Things)
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<p>Research model.</p>
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<p>Research flow.</p>
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21 pages, 19119 KiB  
Article
Caterpillar-Inspired Multi-Gait Generation Method for Series-Parallel Hybrid Segmented Robot
by Mingyuan Dou, Ning He, Jianhua Yang, Lile He, Jiaxuan Chen and Yaojiumin Zhang
Biomimetics 2024, 9(12), 754; https://doi.org/10.3390/biomimetics9120754 - 11 Dec 2024
Viewed by 402
Abstract
The body structures and motion stability of worm-like and snake-like robots have garnered significant research interest. Recently, innovative serial–parallel hybrid segmented robots have emerged as a fundamental platform for a wide range of motion modes. To address the hyper-redundancy characteristics of these hybrid [...] Read more.
The body structures and motion stability of worm-like and snake-like robots have garnered significant research interest. Recently, innovative serial–parallel hybrid segmented robots have emerged as a fundamental platform for a wide range of motion modes. To address the hyper-redundancy characteristics of these hybrid structures, we propose a novel caterpillar-inspired Stable Segment Update (SSU) gait generation approach, establishing a unified framework for multi-segment robot gait generation. Drawing inspiration from the locomotion of natural caterpillars, the segments are modeled as rigid bodies with six degrees of freedom (DOF). The SSU gait generation method is specifically designed to parameterize caterpillar-like gaits. An inverse kinematics solution is derived by analyzing the forward kinematics and identifying the minimum lifting segment, framing the problem as a single-segment end-effector tracking task. Three distinct parameter sets are introduced within the SSU method to account for the stability of robot motion. These parameters, represented as discrete hump waves, are intended to improve motion efficiency during locomotion. Furthermore, the trajectories for each swinging segment are determined through kinematic analysis. Experimental results validate the effectiveness of the proposed SSU multi-gait generation method, demonstrating the successful traversal of gaps and rough terrain. Full article
(This article belongs to the Section Locomotion and Bioinspired Robotics)
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<p>Natural caterpillar locomotion pattern. (<b>a</b>) Natural caterpillar locomotion sequence (the red dashed line represents stable segment; the yellow dashed line represents swinging segment). (<b>b</b>) Schematic diagram of natural caterpillar segments.</p>
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<p>Nine-state of one segment motion trajectory.</p>
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<p>The hump formed on the natural caterpillar locomotion in a single segment 9-state trajectory. The illustration of the hump formed in the SSU method (red segment ((<b>3</b>)–(<b>6</b>) left) is the segment that is about to enter the swinging phase during the stance phase; red segment (right) is the segment that has ended the swinging phase during the stance phase. The yellow segment is the swinging segment in the swinging phase).</p>
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<p>Footfall-pattern diagram of nature caterpillar gait.</p>
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<p>Robot mechanism and variables. (<b>a</b>) 3-RSR. (<b>b</b>) 4-3-RSR.</p>
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<p>The kinematics analysis of 4-3-RSR robot SSU parameters <math display="inline"><semantics> <mrow> <msub> <mi>N</mi> <mrow> <mi>min</mi> </mrow> </msub> </mrow> </semantics></math>. In the 3-RSR parallel mechanism, (<b>a</b>) the relationship of the distal plate center in axis <math display="inline"><semantics> <mi>X</mi> </semantics></math> coordinate component and base angle <math display="inline"><semantics> <mrow> <msub> <mi>θ</mi> <mn>1</mn> </msub> <mo>,</mo> <msub> <mi>θ</mi> <mn>2</mn> </msub> <mo>,</mo> <msub> <mi>θ</mi> <mn>3</mn> </msub> </mrow> </semantics></math>; (<b>b</b>) the relationship of the pitch angle of the distal plate and base angle <math display="inline"><semantics> <mrow> <msub> <mi>θ</mi> <mn>1</mn> </msub> <mo>,</mo> <msub> <mi>θ</mi> <mn>2</mn> </msub> <mo>,</mo> <msub> <mi>θ</mi> <mn>3</mn> </msub> </mrow> </semantics></math>; (<b>c</b>) the relationship of the pitch angle of the distal plate and distal plate center in axis <math display="inline"><semantics> <mi>X</mi> </semantics></math> coordinate component. (<b>d</b>) The 2-3-RSR mechanism and variables.</p>
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<p>The robot posture when <math display="inline"><semantics> <mrow> <mi>φ</mi> <mo>=</mo> <mrow> <mn>1</mn> <mo>/</mo> <mn>2</mn> </mrow> </mrow> </semantics></math>.</p>
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<p>SSU gait generation flowchart.</p>
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<p>The SSU swinging segment trajectory. (<b>a</b>) The gaits sequence for <math display="inline"><semantics> <mrow> <mfenced> <mrow> <mi>m</mi> <mo>−</mo> <mn>1</mn> </mrow> </mfenced> <mi>th</mi> </mrow> </semantics></math> segment trajectory <math display="inline"><semantics> <mrow> <msub> <mover accent="true"> <mi>s</mi> <mo stretchy="false">^</mo> </mover> <mrow> <msub> <mi>c</mi> <mn>1</mn> </msub> </mrow> </msub> <mfenced> <mi>t</mi> </mfenced> </mrow> </semantics></math>. (<b>b</b>) The gaits sequence for <math display="inline"><semantics> <mrow> <mfenced> <mrow> <mi>m</mi> <mo>−</mo> <mn>1</mn> </mrow> </mfenced> <mi>th</mi> </mrow> </semantics></math> segment trajectory <math display="inline"><semantics> <mrow> <msub> <mover accent="true"> <mi>s</mi> <mo stretchy="false">^</mo> </mover> <mrow> <mi>c</mi> <mn>2</mn> </mrow> </msub> <mfenced> <mi>t</mi> </mfenced> </mrow> </semantics></math>. (<b>c</b>) The trajectory of <math display="inline"><semantics> <mrow> <mfenced> <mrow> <mi>m</mi> <mo>−</mo> <mn>2</mn> </mrow> </mfenced> <mi>th</mi> </mrow> </semantics></math> segment progressive. (<b>d</b>) The compensate trajectory <math display="inline"><semantics> <mrow> <msub> <mover accent="true"> <mi>s</mi> <mo stretchy="false">^</mo> </mover> <mrow> <mi>c</mi> <mn>1</mn> </mrow> </msub> <mfenced> <mi>t</mi> </mfenced> </mrow> </semantics></math> of <math display="inline"><semantics> <mrow> <mfenced> <mrow> <mi>m</mi> <mo>−</mo> <mn>1</mn> </mrow> </mfenced> <mi>th</mi> </mrow> </semantics></math> segment. (<b>e</b>) The compensate trajectory <math display="inline"><semantics> <mrow> <msub> <mover accent="true"> <mi>s</mi> <mo stretchy="false">^</mo> </mover> <mrow> <mi>c</mi> <mn>2</mn> </mrow> </msub> <mfenced> <mi>t</mi> </mfenced> </mrow> </semantics></math> of <math display="inline"><semantics> <mrow> <mfenced> <mrow> <mi>m</mi> <mo>−</mo> <mn>1</mn> </mrow> </mfenced> <mi>th</mi> </mrow> </semantics></math> segment progressive.</p>
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<p>Three gaits pattern of 4-3-RSR robot. (<b>a</b>) The 1-1-1-1-1 gait, (<b>b</b>) 1-1-2-1 gait, and (<b>c</b>) 1-2-2 gait. Footfall-pattern diagram of the (<b>d</b>) 1-1-1-1-1 gait, (<b>e</b>) 1-1-2-1 gait, and (<b>f</b>) 1-2-2 gait.</p>
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<p>The 4-3-RSR robot. (<b>a</b>) Three rotary joints replace the sphere joint. (<b>b</b>) The 4-3-RSR robot press plate (left) and main view (right).</p>
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<p>Joint trajectories of 4-3-RSR robot. (<b>a</b>) The 1-1-1-1-1 gait, (<b>b</b>) 1-1-2-1 gait, and (<b>c</b>) 1-2-2 gait, where (1) (2) (3) (4) illuminate the 1st, 2nd, 3rd, and 4th 3-RSR parallel mechanism joint trajectories.</p>
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<p>Three gaits experiment of the 4-3-RSR robot. (<b>a</b>) The 1-1-1-1-1 gait, (<b>b</b>) 1-1-2-1 gait, and (<b>c</b>) 1-2-2 gait. (The red dotted line represents the stable segment, and the yellow dotted line represents the swinging segment).</p>
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<p>Locomotion of the 4-3-RSR robot rectilinear gait.</p>
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<p>The 1-1-1-1-1-1 gait crossing gaps.</p>
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<p>The 1-1-1-1-1-1 gait on roughness terrain.</p>
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18 pages, 2246 KiB  
Article
Seedling Production of Retrophyllum rospigliosii in Nurseries and Potential Reforestation Areas Using Modeling Techniques
by Rozly Clarita Camarena-Yupanqui, Edith Orellana-Mendoza, Rosario Marilu Bernaola-Paucar, Fressia Nathalie Ames-Martínez, Harold Loardo-Tovar and Harold Rusbelth Quispe-Melgar
Forests 2024, 15(12), 2179; https://doi.org/10.3390/f15122179 - 11 Dec 2024
Viewed by 586
Abstract
The success of reforestation and restoration projects depends on several factors, with proper seedling management and the selection of an appropriate planting area being crucial. In Peru, the populations of Retrophyllum rospigliosii (Pilg.) C.N.Page (Ulcumano) have been decreasing due to intensive logging of [...] Read more.
The success of reforestation and restoration projects depends on several factors, with proper seedling management and the selection of an appropriate planting area being crucial. In Peru, the populations of Retrophyllum rospigliosii (Pilg.) C.N.Page (Ulcumano) have been decreasing due to intensive logging of one of the most valuable woods in South America’s tropical forests. There are few studies that unify the production of plants through seeds in nurseries and the identification of suitable areas to place the plants produced. Our study has two components. The first aimed to optimize the plant production process through an experiment that evaluated the effects of three doses of controlled-release fertilizer (CRF) (4.2, 8.4, and 12.6 g/L) and two container sizes (115 and 180 cc) on the morphological quality of seedlings in the nursery. The second component involved identifying potential reforestation areas using ecological niche modeling, based on climatic and edaphic variables. The results indicated that the 4.2 g/L CRF treatment for both container sizes had a significant positive effect on seedling growth. The average germination rate was 85% at 120 days. At six months after seedling transplantation, treatments of 4.2 g/L CRF in 115 cc and 180 cc containers were shown to have the best positive effect on morphological variables of seedlings, with a root collar diameter of 3.76 mm and a height of 13.25 cm. Regarding the potential niche models, an area of 6321.97 km2 with ideal conditions for reforestation with R. rospigliosii was estimated, with the departments of Huánuco, Pasco, Junín, and Cusco showing the highest potential. Based on this, it is estimated that over three million plants are needed for large-scale reforestation projects. Integrating silvicultural studies with niche models is a valuable tool for supporting reforestation and ecosystem restoration projects. Full article
(This article belongs to the Section Forest Ecology and Management)
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<p>Study area for <span class="html-italic">Retrophyllum rospigliosii</span> (Pilg.) C.N.Page in the Peruvian Andes. (<b>A</b>) Records of the species within Peruvian territory. (<b>B</b>) Location of the experiment. (<b>C</b>) Adult trees. (<b>D</b>) Seedlings at six months after transplanting. (<b>E</b>) Root and aerial growth of seedlings in containers.</p>
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<p>Growth and development of <span class="html-italic">R. rospigliosii</span>: root collar diameter (<b>A</b>); seedling height (<b>B</b>); aerial dry biomass (<b>C</b>); root dry biomass (<b>D</b>); and total dry biomass (<b>E</b>). Different letters indicate significant differences (<span class="html-italic">p</span> &lt; 0.05).</p>
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<p>Morphological indices of <span class="html-italic">R. rospigliosii</span>: robustness index (<b>A</b>); Dickson quality index (<b>B</b>) and dry shoot biomass/dry root biomass ratio index (ADB/RDB) (<b>C</b>). Different letters indicate significant differences (<span class="html-italic">p</span> &lt; 0.05).</p>
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<p><span class="html-italic">R. rospigliossi</span> potential area in Peru: (<b>A</b>) potential current area, and (<b>B</b>) potential reforestation area.</p>
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21 pages, 4145 KiB  
Article
UniFlow: Unified Normalizing Flow for Unsupervised Multi-Class Anomaly Detection
by Jianmei Zhong and Yanzhi Song
Information 2024, 15(12), 791; https://doi.org/10.3390/info15120791 - 10 Dec 2024
Viewed by 421
Abstract
Multi-class anomaly detection is more efficient and less resource-consuming in industrial anomaly detection scenes that involve multiple categories or exhibit large intra-class diversity. However, most industrial image anomaly detection methods are developed for one-class anomaly detection, which typically suffer significant performance drops in [...] Read more.
Multi-class anomaly detection is more efficient and less resource-consuming in industrial anomaly detection scenes that involve multiple categories or exhibit large intra-class diversity. However, most industrial image anomaly detection methods are developed for one-class anomaly detection, which typically suffer significant performance drops in multi-class scenarios. Research specifically targeting multi-class anomaly detection remains relatively limited. In this work, we propose a powerful unified normalizing flow for multi-class anomaly detection, which we call UniFlow. A multi-cognitive visual adapter (Mona) is employed in our method as the feature adaptation layer to adapt image features for both the multi-class anomaly detection task and the normalizing flow model, facilitating the learning of general knowledge of normal images across multiple categories. We adopt multi-cognitive convolutional networks with high capacity to construct the coupling layers within the normalizing flow model for more effective multi-class distribution modeling. In addition, we employ a multi-scale feature fusion module to aggregate features from various levels, thereby obtaining fused features with enhanced expressive capabilities. UniFlow achieves a class-average image-level AUROC of 99.1% and a class-average pixel-level AUROC of 98.0% on MVTec AD, outperforming the SOTA multi-class anomaly detection methods. Extensive experiments on three benchmark datasets, MVTec AD, VisA, and BTAD, demonstrate the efficacy and superiority of our unified normalizing flow in multi-class anomaly detection. Full article
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<p>One-class anomaly detection versus multi-class anomaly detection.</p>
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<p><b>Overview of UniFlow.</b> Mona FA: Mona feature adaptation. Ds: Downsample. MC Affine Layer: Multi-cognitive affine coupling layer. MC Additive Layer: Multi-cognitive additive coupling layer. Two Mona feature adaptation layers are employed to adapt the features from two stages. We downsample the feature maps extracted in the second stage to half of their original size via average pooling. Notably, Gaussian noise is added to the features only during the training phase.</p>
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<p>(<b>a</b>) The architecture of Mona. (<b>b</b>) The architecture of multi-cognitive convolutional module. (<b>c</b>) Mona-tuning in each SwinBlock.</p>
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<p>The architecture of the multi-cognitive additive coupling layer. Multi-cognitive Conv: Multi-cognitive convolutional module in <a href="#information-15-00791-f003" class="html-fig">Figure 3</a>b. <math display="inline"><semantics> <mrow> <mn>1</mn> <mo>×</mo> <mn>1</mn> </mrow> </semantics></math> Conv: A convolutional layer with a kernel size of <math display="inline"><semantics> <mrow> <mn>1</mn> <mo>×</mo> <mn>1</mn> </mrow> </semantics></math> and a stride of 1, where the output retains the same shape as the input. Global Affine: Further scaling and translation applied to the global output. Channel permute: Shuffling the order of the channel dimension.</p>
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<p>The architecture of the multi-cognitive affine coupling layer. Multi-cognitive Conv: Multi-cognitive convolutional module in <a href="#information-15-00791-f003" class="html-fig">Figure 3</a>b. <math display="inline"><semantics> <mrow> <mn>3</mn> <mo>×</mo> <mn>3</mn> </mrow> </semantics></math> Conv: A convolutional layer with a kernel size of <math display="inline"><semantics> <mrow> <mn>3</mn> <mo>×</mo> <mn>3</mn> </mrow> </semantics></math> and a stride of 1, where the output has the same spatial dimensions as the input but with twice the number of channels. Global Affine: Further scaling and translation applied to the global output. Channel permute: Shuffling the order of the channel dimension.</p>
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<p>Visualization results of anomaly localization for examples from MVTec AD [<a href="#B18-information-15-00791" class="html-bibr">18</a>] and BTAD [<a href="#B20-information-15-00791" class="html-bibr">20</a>].</p>
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<p>Visualization results of anomaly localization for examples from VisA [<a href="#B19-information-15-00791" class="html-bibr">19</a>].</p>
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<p>The impact of varying feature jittering probability on anomaly detection and localization performance on MVTec AD.</p>
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<p>Framework of the convolutional feature adaptation layer.</p>
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29 pages, 2318 KiB  
Review
A Review of Smart Camera Sensor Placement in Construction
by Wei Tian, Hao Li, Hao Zhu, Yongwei Wang, Xianda Liu, Rongzheng Yang, Yujun Xie, Meng Zhang, Jun Zhu and Xiangyu Wang
Buildings 2024, 14(12), 3930; https://doi.org/10.3390/buildings14123930 - 9 Dec 2024
Viewed by 398
Abstract
Cameras, with their low cost and efficiency, are widely used in construction management and structural health monitoring. However, existing reviews on camera sensor placement (CSP) are outdated due to rapid technological advancements. Furthermore, the construction industry poses unique challenges for CSP implementation due [...] Read more.
Cameras, with their low cost and efficiency, are widely used in construction management and structural health monitoring. However, existing reviews on camera sensor placement (CSP) are outdated due to rapid technological advancements. Furthermore, the construction industry poses unique challenges for CSP implementation due to its scale, complexity, and dynamic nature. Previous reviews have not specifically addressed these industry-specific demands. This study aims to fill this gap by analyzing articles from the Web of Science and ASCE databases that focus exclusively on CSP in construction. A rigorous selection process ensures the relevance and quality of the included studies. This comprehensive review navigates through the complexities of camera and environment models, advocating for advanced optimization techniques like genetic algorithms, greedy algorithms, Swarm Intelligence, and Markov Chain Monte Carlo to refine CSP strategies. Simultaneously, Building Information Modeling is employed to consider the progress of construction and visualize optimized layouts, improving the effect of CSP. This paper delves into perspective distortion, the field of view considerations, and the occlusion impacts, proposing a unified framework that bridges practical execution with the theory of optimal CSP. Furthermore, the roadmap for future exploration in the CSP of construction is proposed. This work enriches the study of construction CSP, charting a course for future inquiry, and emphasizes the need for adaptable and technologically congruent CSP approaches amid evolving application landscapes. Full article
(This article belongs to the Special Issue Smart and Digital Construction in AEC Industry)
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<p>Research methodology.</p>
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<p>Methodological workflow.</p>
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<p>Camera mode: (<b>a</b>) bullet/dome camera, (<b>b</b>) omnidirectional cameras.</p>
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<p>The general framework of GAs.</p>
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<p>The iteration process of PSO.</p>
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<p>The camera placement optimization framework based on BIM.</p>
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28 pages, 1843 KiB  
Article
Can Multimodal Large Language Models Enhance Performance Benefits Among Higher Education Students? An Investigation Based on the Task–Technology Fit Theory and the Artificial Intelligence Device Use Acceptance Model
by Amany Al-Dokhny, Omar Alismaiel, Samia Youssif, Nermeen Nasr, Amr Drwish and Amira Samir
Sustainability 2024, 16(23), 10780; https://doi.org/10.3390/su162310780 - 9 Dec 2024
Viewed by 658
Abstract
The current study highlights the potential of multimodal large language models (MLLMs) to transform higher education by identifying key factors influencing their acceptance and effectiveness. Aligning technology features with educational needs can enhance student engagement and learning outcomes. The study examined the role [...] Read more.
The current study highlights the potential of multimodal large language models (MLLMs) to transform higher education by identifying key factors influencing their acceptance and effectiveness. Aligning technology features with educational needs can enhance student engagement and learning outcomes. The study examined the role of MLLMs in enhancing performance benefits among higher education students, using the task–technology fit (T-TF) theory and the artificial intelligence device use acceptance (AIDUA) model. A structured questionnaire was used to assess the perceptions of 550 Saudi university students from various academic disciplines. The data were analyzed via structural equation modeling (SEM) using SmartPLS 3.0. The findings revealed that social influence negatively affected effort expectancy regarding MLLMs and that hedonic motivation was also negatively related to effort expectancy. The findings revealed that social influence and hedonic motivation negatively affected effort expectancy for MLLMs. Effort expectancy was also negatively associated with T-TF in the learning context. In contrast, task and technology characteristics significantly influenced T-TF, which positively impacted both performance benefits and the willingness to accept the use of MLLMs. A strong relationship was found between adoption willingness and improved performance benefits. The findings empower educators to strategically enhance MLLMs adoption strategically, driving transformative learning outcomes. Full article
(This article belongs to the Special Issue Sustainable Digital Education: Innovations in Teaching and Learning)
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<p>Research model.</p>
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<p>Path coefficient results.</p>
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<p>Path (t-value) results.</p>
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