Multi-task learning (MTL) has been successfully applied to many recommendation applications. However, MTL models often suffer from performance degeneration with negative transfer due the complex and competing task correlation in real-world recommender systems. Moreover, through extensive experiments across SOTA models, we have observed an interesting seesaw phenomenon that of one is improved by hurting some other tasks. To address these issues, propose a Progressive Layered Extraction (PLE)...

The design and implementation of a compact monopole antenna with broadband circular polarization is presented in this letter. proposed consists simple C-shaped patch modified ground plane the overall size 0.33 λ × 0.37 λ. By properly embedding slit improving two triangular stubs, measured 3-dB axial-ratio bandwidth 104.7% (2.05–6.55 GHz) obtained, while impedance 106.3% (2.25–7.35 GHz), defined by –10-dB return loss, achieved. performance for different parameters analyzed. good candidate...

ABSTRACT This letter presents a compact 77 GHz millimeter‐wave comb antenna, exhibiting suppressed side‐lobe and enhanced gain. In the conventional tapered lager‐width of radiating stub performs decreased resonance ability. By loading coupling patches cutting notches on elements, it is possible to increase resonant ability design an antenna array with satisfying radiation pattern Low cost, low profile ease fabrication are further advantages proposed array. Two arrays (1 × 13 4 13) operating...

Vertical take-off and landing unmanned aerial vehicles (VTOL UAV) are widely used in various fields because of their stable flight, easy operation, low requirements for environments. To further expand the UAV's environment to include a non-structural complex environment, this study developed gear robot VTOL vehicles. This article mainly introduces adaptive control an unstructured environment. Based on depth camera (TOF camera), IMU, optical flow sensor, system achieves multi-sensor data...

ABSTRACT This article proposes a novel miniaturized dual‐band filter, which is implemented by combining quarter‐mode substrate integrated waveguide (QMSIW) and complementary split‐ring resonator (CSRR). The consists of QMSIW cavity CSRR structure, can miniaturize SIW filter increasing electrical length the CSRR. With combination two second‐order filters different size, propagating passbands be generated. Based on proposed prototype designed, fabricated, measured. measured are centered at 3.5...

A novel compact monopole antenna with wide circularly polarised (CP) bandwidth is designed, fabricated and measured. The impedance broadband CP characteristic are achieved based on a simple tilted structure, which consists of slotted rectangular patch an improved ground plane. measured return loss better than 10 dB 97.4% (1.10–3.19 GHz), the 3 axial‐ratio 59.1% (1.11–2.04 GHz) peak gain within operating band 4.84 dBic, indicates that it good candidate for application various global...

This paper presents and investigates a new three-rotation (3R) parallel compliant mechanism that uses rods to achieve three rotations. The is designed for use in pointing devices or as spatial manipulator. mobility analysis based on the Cosserat rod model Lagrangian dynamics equations. equations are then effectively solved using back-propagation neural network chaos-enhanced accelerated particle swarm optimization. After studying of moving platform, simplified proposed used kinematic...

In the field of medicine, blood analysis is one most important means assessing human health. The type and number cells an basis for doctors to diagnose treat diseases. To solve problems difficult classification low efficiency in cell detection. this paper, improved YOLOv5-BS target detection algorithm proposed. purpose improvement improve real-time accuracy identification. based on YOLOv5s network adds advantages CNN Transformer. First, combine BotNet backbone. Then replace YOLOv5 Head...

Abstract A novel compact triple‐band circularly polarized monopole antenna has been proposed for wireless local area network (WLAN) and worldwide interoperability microwave access (WiMAX) applications. The composes of a square patch etched with an X‐shaped slit improved ground plane. Furthermore, inverted‐L is embedded in the to improve axial ratio (AR) impedance bandwidth. With size 44 × 46 1.5 mm 3 , provides relative wide 3‐dB AR bandwidth 24.2% (2.22–2.83 GHz), 25.9% (2.92–3.79 9.3%...

An orbital angular momentum (OAM) antenna based on four‐arm planar spiral for multiple OAM modes generation is proposed in this Letter. There are four generated by employing different phase feeding arrangements the ports. By adjusting branch between port and corresponding arm, a good match can be easily obtained. The characteristics of with at operating frequency 5.8 GHz presented both simulation experiment, 10‐dB return loss from 5.6 to 6.0 GHz. measured near‐field distributions clearly...

In this letter, the channel current magnetic effect of complementary metal-oxide-semiconductor (CMOS) transistors is studied, and an improved small-signal equivalent circuit model (SSECM) proposed. Silicon-on-insulator (SOI) CMOS were fabricated measured in a commercial 0.18-μm process. Then, series RL network introduced into classical transistor SSECM to characterize effect. To validate model, scattering parameters calculated by are compared with measurement data. The results show that...

This article proposes a new reconfigurable parallel mechanism using spatial overconstrained platform. proposed can be used as machine tool. The mobility is analyzed by Screw Theory. inverse kinematic model established applying the closed-loop equation. Next, dynamic of presented Lagrange formulation. To control mechanism, some controllers have been used. Based on this model, fuzzy-proportion integration differentiation (PID) controller designed to track trajectory end effector. For each...

A novel ultrawideband (UWB) printed planar antenna with triple band-notched characteristics is proposed and discussed in this paper. The realization of the antenna's owed to slots on ground plane radiating patch. By employing a curve-shaped defected structure (DGS) plane, notched band (SATCOM) 8.0-8.4 GHz achieved. embedding two arc-shaped patch, another bands (WIMAX) 3.3-3.6 (WLAN) 5.1-5.8 are has been successfully simulated, fabricated, measured. Moreover, designed compact size lower cost,...

A simple E-shaped patch array antenna with low profile and high gain is proposed for the millimeter-wave wireless communication system. The can achieve impedance bandwidth from 56.6 GHz to 64.5 GHz, which covers unlicensed frequency of 60 (57-64 GHz). peak 17.92 dBi. results show that has great potential application millimeter wave communication.

It is a well-known challenge to learn an unbiased ranker with biased feedback. Unbiased learning-to-rank(LTR) algorithms, which are verified model the relative relevance accurately based on noisy feedback, appealing candidates and have already been applied in many applications single categorical labels, such as user click signals. Nevertheless, existing LTR methods cannot properly handle continuous essential for industrial applications, content recommender systems. To provide personalized...

The transmission characteristics of optically controlled phase shifters employing the organic semiconductor poly(3-hexylthiophene) (P3HT) are reported. Two microstrip structures were fabricated onto a P3HT coated indium tin oxide substrate supported by glass. Experimental results on these unoptimized prototype yield reversible differential shifts >10° at 2.0GHz under tens milliwatt optical power illumination. These devices demonstrate great potential as linear analog shifters.

A harmonic-tuned (HT) voltage-controlled oscillator in a 65-nm CMOS process is demonstrated this letter. The oscillation frequency and harmonics are tuned independently by two separated high-Q resonators. novel F <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">23</sub> inductor-capacitor resonator resonating at the second third simultaneously introduced. proposed inductor has high-quality factor of 15 24 common-mode (CM) differential-mode (DM),...

This paper presents a novel monopole antenna with dual band-notched characteristics and half-patch broadband circular microstrip antenna. To obtain this feature, two optimized arc-shaped slot is embedded to the disk UWB The normal type of used achieve wide impedance bandwidth. An omnidirectional radiation pattern also achieved, which enables proposed be in communication systems. Based on full patch has ultra bandwidth for embedding pair double slots, half obtained by cutting away radiator....

A compact ultra-wideband (UWB) planar antenna with reconfigurable band-notched characteristics is proposed in this paper. The covers the frequency band from 3GHz to 11GHz (S11 ≤ −10), 114% fractional bandwidth. T-shaped on ground used widen of antenna. Dual arc-shaped slots are embedded patch, obtain (WIMAX) 3.3–3.6 GHz and (WLAN) 5.1–5.9 notched bands. achieved by adding PIN diode slot. When conductive DC voltage source, disappeared good UWB characteristic. measured results have a agreement...

Using the spherical trip theorem, we present a new intrinsic proof of Gromoll–Grove diameter rigidity theorem: "If simply-connected Riemannian manifold has sectional curvature ≥ 1 and [Formula: see text], then either it is homeomorphic to sphere, or isometric one classic projective spaces".