2,724 results match your criteria: "Beijing University of Posts & Telecommunications[Affiliation]"

The evolution of cooperation is a theme commonly studied in biology, psychology, sociology, and economics. Mechanisms that promote cooperative behavior in structured populations have been intensively studied. However, individuals' values, specifically, their opinions have been rarely taken into account so far.

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Topological valley-locked waveguides with C impurity.

Nanophotonics

August 2024

Key Laboratory of Polar Materials and Devices, Department of Electronic Sciences, School of Physics and Electronic Sciences, East China Normal University, Shanghai 200241, China.

Article Synopsis
  • * The study introduces a C impurity that can control light wave transmission states in these waveguides, essentially acting as a switch for different orientations (0°/45°).
  • * The innovations presented could lead to advanced applications like flexible coding channels and improved energy concentrators in integrated photonic networks.
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Topological hyperbolic metamaterials.

Nanophotonics

March 2024

Department of Electrical and Computer Engineering, North Carolina State University, Raleigh, NC 27695, USA.

Article Synopsis
  • Hyperbolic metamaterials (HMM) exhibit both metal and dielectric properties simultaneously, enabling advanced applications like super-resolution imaging but suffer from intrinsic losses that limit their effectiveness.
  • The development of active HMM, which incorporates gain materials to offset losses, has sparked research into topological aspects of HMM, fostering innovations like lossless HMM using all-dielectric materials.
  • Recent studies focus on topological transitions and edge states in HMM, alongside potential advancements through twistronics, highlighting a promising area for future exploration.
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Article Synopsis
  • - The multicore fiber amplifier is essential for advanced spatial division multiplexing (SDM) communication, but it has more complex challenges than traditional single-core systems, prompting the search for a more efficient solution.
  • - An innovative triple cladding 13-core Er/Yb co-doped microstructured fiber (13CEYDMOF) is proposed to balance performance factors like efficiency and cost, featuring unique peanut-shaped air holes that improve excitation and reduce fiber size.
  • - Experimental results show that the 13CEYDMOF achieved impressive performance metrics, including an average gain of 23.8 dB and a low noise figure, making it suitable for transmitting 13 spatial channels effectively in the telecommunication band.
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Neurons receive synaptic inputs with diverse temporal patterns in vivo, and their integration of these patterns is critical for understanding information processing mechanisms in the brain. Fast-spiking basket cells, which perform both supralinear and sublinear dendritic integration, are essential for inhibitory control in the hippocampus. However, their responses and the mechanisms underlying different temporal input patterns remain unclear.

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EMR-LIP: A lightweight framework for standardizing the preprocessing of longitudinal irregular data in electronic medical records.

Comput Methods Programs Biomed

February 2025

Center for Computational Systems Medicine, McWilliams School of Biomedical Informatics, The University of Texas Health Science Center at Houston, Houston, Texas, 77030, USA. Electronic address:

Article Synopsis
  • The study introduces the EMR-LIP framework, designed to standardize and optimize the preprocessing of complex Electronic Medical Records (EMRs) data for better clinical predictive modeling.
  • EMR-LIP allows for a more detailed categorization of variables and tailor-made preprocessing techniques, demonstrating its effectiveness through analysis of two public EMR databases, MIMIC-IV and eICU-CRD.
  • The results indicated that models using EMR-LIP preprocessing improved overall performance, achieving high accuracy rates in predicting in-hospital deaths and ensuring fairness across different ethnic groups.
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We comparatively studied the wetting behavior of water droplets on graphene and biphenylene using molecular dynamics simulations. The research showed that pristine biphenylene (BPN), unlike graphene, exhibits greater hydrophobicity and anisotropic wettability. This specific anisotropy can be tuned by the layer number and vacancy concentration.

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Dynamic Passivation of Perovskite Films via Gradual Additive Release for Enhanced Solar Cell Efficiency.

Angew Chem Int Ed Engl

November 2024

Key Laboratory of Applied Surface and Colloid Chemistry, Ministry of Education, Shaanxi Key Laboratory for Advanced Energy Devices, Shaanxi Engineering Lab for Advanced Energy Technology, School of Materials Science and Engineering, Shaanxi Normal University, Xi'an, 710119, China.

Article Synopsis
  • Modifying perovskites with functional additives improves their crystallization and defect passivation, enhancing photovoltaic efficiency.
  • Conventional pre-mixing methods struggle with uneven additive distribution, limiting their effectiveness in targeting defect sites.
  • This study introduces a dynamic passivation strategy that releases additives during crystallization, leading to better film quality and a solar cell efficiency of 25.33%, supporting the potential for commercial use.
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Isolation Transformer Based Very Low Frequency Antenna with Enhanced Radiation Characteristics.

Adv Sci (Weinh)

November 2024

State Key Laboratory of Information Photonics and Optical Communications, School of Science, Beijing University of Posts and Telecommunications, Beijing, 100876, P. R. China.

Very low frequency electromagnetic waves adeptly propagate in harsh cross-medium environments, surmounting the rapid attenuation that impedes high-frequency counterparts. Traditional low frequency antennas, however, encounter challenges concerning size, efficiency, and power. Here, an isolation transformer based very low frequency loop antenna with compact size and well impedance matching is proposed to enhance radiation characteristics for long-distance communication.

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Quantum Privacy-Preserving Range Query Protocol for Encrypted Data in IoT Environments.

Sensors (Basel)

November 2024

School of Information and Electrical Engineering, Hangzhou City University, Hangzhou 310015, China.

With the rapid development of IoT technology, securely querying sensitive data collected by devices within a specific range has become a focal concern for users. This paper proposes a privacy-preserving range query scheme based on quantum encryption, along with circuit simulations and performance analysis. We first propose a quantum private set similarity comparison protocol and then construct a privacy-preserving range query scheme for IoT environments.

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ASIP Performance Enhancement by Hazard Control through Scoreboard.

Micromachines (Basel)

October 2024

Ultichip Communication Technology, Beijing 100088, China.

The application-specific instruction set processor (ASIP) has been gradually accepted in AI, communication, media, game and industry control. The digital signal processor (DSP) is a typical ASIP, whose benefits include high performance in specific domains, low power consumption, high flexibility and low silicon consumption. One of the challenges for DSP design is to handle problems induced by datapath acceleration.

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Article Synopsis
  • - The research explores how the COVID-19 pandemic influenced emotional eating, especially concerning snacks and sweets, by analyzing social media posts from Sina Weibo using Natural Language Processing.
  • - It identifies three phases of consumer behavior during the pandemic: anxiety, escapism, and compensatory periods, each reflecting different levels of emotional eating.
  • - The study found a significant rise in posts about compensatory consumption of snacks and sweets in 2020 compared to 2019, indicating a psychological shift impacted by the pandemic, with implications for health policymakers and the food industry.
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Some Improvements on Good Lattice Point Sets.

Entropy (Basel)

October 2024

Guangdong Provincial Key Laboratory of Interdisciplinary Research and Application for Data Science, BNU-HKBU United International College, Zhuhai 519087, China.

Good lattice point (GLP) sets are a type of number-theoretic method widely utilized across various fields. Their space-filling property can be further improved, especially with large numbers of runs and factors. In this paper, Kullback-Leibler (KL) divergence is used to measure GLP sets.

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Introduction: The global aesthetic medicine industry is rapidly expanding, with conferences serving as crucial platforms for knowledge exchange and collaboration. However, concerns have emerged about the increasing prioritisation of commercial content over scientifically rigorous presentations. This study critically evaluates the balance between commercial and scientific content at aesthetic medicine conferences, utilising artificial intelligence (AI) tools to analyse the impact of industry sponsorship and live procedural demonstrations on educational value.

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Effect of adult hippocampal neurogenesis on pattern separation and its applications.

Cogn Neurodyn

October 2024

School of Science, Beijing University of Posts and Telecommunications, #10 Xitucheng Road, Beijing, 100876 People's Republic of China.

Adult hippocampal neurogenesis (AHN) is considered essential in memory formation. The dentate gyrus neural network containing newborn dentate gyrus granule cells at the critical period (4-6 weeks) have been widely discussed in neurophysiological and behavioral experiments. However, how newborn dentate gyrus granule cells at this critical period influence pattern separation of dentate gyrus remains unclear.

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Compared to conventional lasers limited to generating static modes, mode-switchable lasers equipped with adjustable optics significantly enhance the flexibility and versatility of coherent light sources. However, most current approaches to achieving mode-switchable lasers depend on conventional, i.e.

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Long-lived triplet states are critical intermediates of thiobases for their applications in photodynamic therapy and as photoprobes for DNA/RNA-protein interactions, where thiobases are embedded in DNA/RNA and exist as thionucleosides. However, sugar moieties accelerate triplet decay rates, which is a common issue that must be resolved for thionucleosides. Here, we explore whether protonation of 2-thiocytosine (2tCyt) and 2-thiocytidine (2tCyd) under acidic pH can alter their triplet decays.

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Photocatalytic Mechanisms of Organic Thermally Activated Delayed Fluorescence Compounds.

J Phys Chem Lett

November 2024

State Key Laboratory of Information Photonic and Optical Communications, and School of Science, Beijing University of Posts and Telecommunications (BUPT), Beijing 100876, P. R. China.

Reverse intersystem crossing (RISC) has become possible by minimizing the energy gap between the first excited singlet (S) and triplet state (T), which facilitates the thermally activated delayed fluorescence (TADF). Due to the small singlet-triplet energy gap, the S and T states exhibit comparable redox reactivity, leading organic TADF compounds to be potent photocatalysts. Here, we report such TADF compounds with multiple donor units designed as an efficient photocatalyst for the direct C(sp)-H carbamoylation of saturated aza-heterocycles.

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The integration of energy harvesting techniques has the potential to significantly prolong target monitoring in wireless sensor networks (WSNs). However, the stochastic nature of hybrid solar-wind energy arrivals poses a significant challenge to optimizing energy utilization for target coverage. To address this issue, we propose a dynamic and distributed node scheduling algorithm based on Lyapunov optimization for hybrid energy-harvesting WSNs (HEH-WSNs).

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Automated fiber quantification analysis identifies tract-specific microstructural alterations in brain in intermittent exotropia.

Brain Res Bull

December 2024

Department of Radiology, MOE Key Laboratory of Major Diseases in Children, Beijing Children's Hospital, Capital Medical University, National Center for Children's Health, Beijing, China. Electronic address:

Background: Growing evidence of neuroimaging has indicated brain microstructural abnormalities in comitant strabismus. Nonetheless, few studies have investigated neuropathological alterations in patients with intermittent exotropia (IXT). This study aimed at examining the characteristics of brain microstructure along major fiber tracts in IXT patients using an automated fiber quantification analysis.

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Although research suggests that trait mindfulness has been negatively associated with perceived stress, an integrative examination of the underlying mechanisms is lacking. Consequently, the purpose of this study was to establish an integrative model within Monitor and Acceptance Theory (MAT). This model examined the relationship between trait mindfulness and perceived stress by assessing two important psychological resources: basic psychological needs satisfaction (BPNS) and psychological flexibility.

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Objective: The use of social media during the COVID-19 pandemic has been researched extensively since the outbreak. Sina Weibo, as one of most commonly used social media platforms in China, played an important role in public expression for the duration of COVID-19. We investigated the themes that emerged from the posts and examined the sentiments associated with each theme.

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Inverse-Designed Ultra-Compact Passive Phase Shifters for High-Performance Beam Steering.

Sensors (Basel)

November 2024

State Key Laboratory of Information Photonics and Optical Communications, Beijing University of Posts and Telecommunications, Beijing 100876, China.

Ultra-compact passive phase shifters are inversely designed by the multi-objective particle swarm optimization algorithm. The wavelength-dependent phase difference between two output beams originates from the different distances of the input light passing through the 4 μm × 3.2 μm rectangular waveguide with random-distributed air-hole arrays.

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To enhance the decoding efficiency of Globally Coupled (GC) LDPC codes, we incorporated Early Termination (ET) and Forced Convergence (FC) into the local/global two-phase decoding algorithm to expedite the decoding process. The two-phase decoding scheme integrates the ET technique to halt unnecessary iterations in the local decoding phase while employing the FC technique to accelerate convergence in the global phase decoding. The application of ET technology in the local decoding of GC-LDPC codes will not cause performance loss as in traditional block codes and will cause considerable complexity gains.

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This paper proposes a dual-band patch antenna with combined self-decoupling and filtering properties, designed to suppress mutual coupling between two antenna elements both within the same dual-band and across different dual-bands. Initially, a dual-band aperture-coupled filtering patch antenna is designed, featuring a forked short-circuited SIR feedline with a quarter-wavelength open-ended stub and a U-shaped patch with two U-slots, which generate three controllable radiation nulls while introducing two additional resonant modes. The design steps are also provided in detail.

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