To address the challenges in recognizing various types of falls, which often exhibit high similarity and are difficult to distinguish, this paper proposes a human fall classification system based on SE-Residual Concatenate Network (SE-RCNet) with adaptive weighted fusion. First, we designed innovative SE-RCNet network, incorporating SE modules after dense residual connections automatically recalibrate feature channel weights suppress irrelevant features. Subsequently, network was used train...

Due to the influence of construction quality, engineering geology and hydrological environment, defects such as dehollowing insufficient compaction can occur in tunnels. Aiming at problems complex detection model, poor real-time performance low accuracy current tunnel lining defect methods, study proposes a lightweight algorithm based on knowledge distillation. Firstly, high-precision teacher model yolov5s was constructed by constructing C3CSFM module that combines residual structure...

One of the greatest engineering feats in history is construction tunnels, and management tunnel safety depends heavily on detection defects. However, real-time, portability, accuracy issues with present defect technique still exist. The study improves traditional technology based knowledge distillation algorithm, depth pooling residual structure designed teacher network to enhance ability extract target features. Next, MobileNetv3 lightweight built into student reduce number volume model...

The defect identification of tunnel lining is a task with lot tasks and time‐consuming work, currently, it mainly relies on manual operation. This paper takes the ground‐penetrating radar image internal defects as research object, chooses popular VGG16, ResNet34 convolutional neural network (CNN) to build automatic recognition model for comparative study, proposes an improved defect‐recognition model. In this paper, SGD Adam training algorithms are used update parameters, PyTorch depth...

Tunnel linings require routine inspection as they have a big impact on tunnel’s safety and longevity. In this study, the convolutional neural network was utilized to develop MFF-YOLO model. To improve feature learning efficiency, multi-scale fusion constructed within neck network. Additionally, reweighted screening method devised at prediction stage address problem of duplicate detection frames. Moreover, loss function adjusted maximize effectiveness model training its overall performance....

The algorithm research on building concept lattice is one of the most important topics in formal analysis. So far, two types algorithms called batch and incremental have been proposed. As fastest algorithm, AddIntent a very promising algorithm. But process recursive construction some concepts accessed repeatedly so that unnecessary time consuming caused. Making full use structure lattice, improved proposed this paper can avoid repeated comparison by adding marks to which are accessed, new or...

A target tracking method based on data fusion of infrared and radar is proposed to improve precision. Unscented Kalman filter (UKF) applied process distributed architectures. The combines the advantages UKF track-to-track algorithms. cross-covariances two sensors are used estimate overall covariance states. estimation obtained by algorithm for optimal combination correlated estimates. simulating radar. simulation results show has in higher precision, probability detection increased.

Aiming at the problem of insufficient number samples due to difficulty data acquisition in identification tunnel lining defects, a generative adversarial network was introduced expand data, and improved for mode collapse traditional that generated image features were not obvious. On basis WGAN-GP network, deep convolutional is selected as its backbone effectiveness feature extraction by Lv et al. (2022) used improve quality images network. In addition, residual module into discriminator...

Cascaded optical parametric oscillations generating a tunable terahertz (THz) wave are analyzed to solve the problem of low quantum conversion efficiency in THz-wave oscillator. The forward and backward processes theoretically based on periodically poled lithium niobate (PPLN) as an example. Tuning characteristics THz that relate parameters pump wavelength, grating period PPLN, working temperature numerically simulated. gain absorption deduced situation quasiphase-matching configuration at...

Due to the polycrystalline cubic boron nitride tool has characteristics of high hardness, brittleness, etc., it is easy break or produce defects in laser cutting process, which affects performance tool. Traditional defect detection methods can no longer meet needs modern manufacturing. Aiming at problems low accuracy and poor real-time surface on laser-cutting tools, this study proposes model based asymptotic fusion strategy, fills gap field. In backbone network, C3SE module constructed by...

Abstract A novel compact five-band internal handset antenna covering LTE (746–806 MHz), GSM850 (824–894 GSM900 (890–960 DCS (1710–1880 MHz) and PCS (1850–1990 bands is presented. To enhance the bandwidths of proposed both at low frequency band high band, a rectangular slot with proper size removed in ground plane an appropriate location. Both simulated results measured show that reasonable radiation patterns gains for each are achieved.

In this letter, a miniaturized high gain dual-band circularly polarized antenna is proposed for the global satellite navigation system application. Centrosymmetric radiation structure with I-shape branches helps improve performance of in low frequency within limited area. The reflective phase modulation (RPM) surface double zero-reflection-phase points analyzed and used to lower profile. bandwidth filtered assisted by RPM surface. composite left/ right hand transmission line feed network...

In this work, we propose a novel dual optical frequency comb (DOFC) generation scheme based on cascaded difference (DCDFG). Feasible designs are introduced that enable the two sets of waves, initially generated by DCDFG in an aperiodically periodically poled lithium niobate (APPLN) crystal with pump wave and signal then transferred to high-order Stokes waves oscillations optimization phase mismatching each-order DCDFG; finally, DOFC was constructed. We demonstrate high-performance...

We present a novel flip-chip packaging technology capable of interconnecting optoelectronic devices packed at very high density. The process utilizes micro-machined cantilevers for establishing electrical contact and is assembled room temperature without solder. have used the to interconnect various devices, including 200-element arrays independently addressable VCSELs having 4 /spl mu/m-wide pads on 6 mu/m pitch silicon CMOS driver chips with equally dense output lines.

Zadeh Absurdity will appear in applying D-S evidence theory to fuse highly conflicting evidence. To solve the problem, a novel information fusion model is presented. Firstly, through calculating capacity, pretreats of containing overlapping focal element; Secondly, utilizes distance function gain every creditable degree which used as weighting factor assign conflicts, and realizes effective modification theory. The numerical experiments show that not only has advantage two kinds methods...

During the course of intercepting fast target in proportion navigation law, missile's acceleration increases so quickly and even reaches its saturated value near hitting spot that guidance precision becomes worse. To analyse effect on an algorithm to calculate miss distance within limitation different is presented simulation three-dimensional field carried out. The indicates hardly influences when exceeds a certain critical which much less than maximal acceleration. can not only but also get...

В статье исследованы три схемы выравнивания нестационарных каналов акустических подводных систем связи UWA (underwater acoustic) с ортогональным частотным разделением OFDM (Orthogonal Frequency Division Multiplexing). Рассмотрены следующие алгоритмы выравнивания: алгоритм обнуления незначащих коэффициентов ZF (zero-forcing), выравнивание по минимальной среднеквадратичной ошибке MMSE (minimum mean square error equalization), и последовательного подавления помех SIC (serial interference...