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A cross-layer scheme for medium access control with QoS guaranteeing for Ad hoc networks

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The Journal of China Universities of Posts and Telecommunications 2006年第3期13卷 43-49页

作者： YU yi-fan yiN chang-chuan YUE Guang-xin School of Telecommunications Engineering Beijing University of Posts and Telecommunications Beijing 100876 China

Ample medium access control （MAC） protocols for Ad hoc networks have been proposed. However, most oal （PHY） layer and the MAC layers. Therefore, their efficiencf them do not take into account the interactions between the physicy and feasibility are greatly limited. In this article, we present a novel MAC protocol for Ad hoc networks according to the idea of cross-layer design. The proposed protocol combines an MAC protocol termed dual busy tone multiple access （DBTMA） with Orthogonal frequency division multiplexing （OFDM） system in IEEE 802.1 la standard. The analysis showed that the proposed protocol provides higher throughput and is more flexible than previous MAC protocols. In addition, it can provide Quality of Service（QoS） guarantee to the packets with different delay requirements in the presence of hidden terminals.

关键词： DBTMA OFDM IEEE 802.11a MAC Cross-layer

Phase Patterning of Poly(oxime-ester)for Information Encryption by Photo-induced Isomerization

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Chinese Journal of Polymer Science 2024年第10期42卷 1488-1494,I0010页

作者： Yu-fan Yang Yun Bai yi-Bao Li chang-Fei He School of Chemistry and Chemical Engineering Gannan Normal UniversityGanzhou341000China

Crystal polymers or liquid crystal elastomers undergo a phase transition that results in a change in the corresponding optical properties,which has the potential to be applied in areas such as information encryption and *** utilization of these materials for patterning purposes requires different phase transition ***,once prepared,altering the phase transition temperature of them presents significant ***,a poly(oxime-ester)(POE)network is developed to achieve high-resolution and multilevel patterning by photo-induced *** as-prepared POE exhibits the ability to transition from an opaque state to a transparent state under temperature stimuli,with the transition temperature and kinetics dependent on UV light exposure ***,complex patterns and information can be encrypted through different selective regional exposure time and decrypted under specific temperature or cooling ***,we illustrate an example of temporal communication,where cooling time or temperature serves as the encoded *** research expands the application scope of advanced encryption materials,showcasing the potential of POE in dynamic information encryption and decryption processes.

关键词： Poly(oxime-ester) Isomerization Phase patterning Information encryption

Recent Progress on Water-based Liquid Embolic Agents in Endovascular Treatment

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Chemical Research in Chinese Universities 2024年第5期40卷 776-785页

作者： QI yi fan Hailong Department of Neurosurgery Faculty of Medicine and Graduate School of MedicineHokkaido UniversitySapporo060-8638Japan Institute for Chemical Reaction Design and Discovery(WPI-ICReDD) Hokkaido UniversitySapporo001-0021Japan

Vascular embolization treatment,a minimally invasive surgery for various blood vessel-related conditions,has emerged as a crucial method in treating such as hemorrhage,arteriovenous malformation,aneurysms,and hypervascular *** embolic agents are gaining prominence due to their distinct advantage in infiltrating distal regions,expanding the scope of embolization beyond the reach of solid *** strides in biomaterials and technologies have spurred the development of novel liquid embolic agents,addressing challenges posed by traditional *** mini-review provides a concise overview of the recent progress in water-based liquid embolic agents,highlighting their potential to overcome limitations associated with current embolic *** presenting selected research outcomes,we illuminate advancements that enhance the efficacy of liquid embolic ***,the review outlines essential properties for effective liquid embolic agents,offering insights for future developments in this field.

关键词： Endovascular treatment Lquid embolic agent Hydrogel

In memory of Robie ***(1948-2022):A scientist and a friend

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Environmental Science and Ecotechnology 2024年第2期18卷 4-6页

作者： yi-fan Li 不详

On February 17,2022,I received an email from Julie Henderson,the life partner of Robie *** her email,she conveyed the following message:"Hello yifan,Rob asked me to especially let you know that when he had *** admired and enjoyed working with you."As I read those words,tears welled up in my eyes,overwhelmed by profound *** was not only my scientific research colleague but also my closest *** had collaborated for more than two decades.

关键词： email friend partner

Characteristics of the HIV/AIDS Epidemic among People Aged≥50 Years in China during 2018–2021

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Biomedical and Environmental Sciences 2024年第4期37卷 399-405页

作者： HOU Yu Shan JIN yi Chen CAI chang TANG Hou Lin QIN Qian Qian LYU fan National Center for AIDS/STD Control and Prevention Chinese Center for Disease Control and PreventionBeijing 102206China

Objective This study aimed to determine the current epidemiological status of PLWHA aged≥50 years in China from 2018 to *** also aimed to recommend targeted interventions for the prevention and treatment of HIV/AIDS in elderly *** Data on newly reported cases of PLWHA,aged≥50 years in China from 2018 to 2021,were collected using the *** tests and spatial analyses were also *** Between 2018 and 2021,237,724 HIV/AIDS cases were reported among patients aged≥50 years in *** main transmission route was heterosexual transmission(91.24%).Commercial heterosexual transmission(CHC)was the primary mode of transmission among males,while non-marital non-CHC([NMNCHC];60.59%)was the prevalent route in *** proportion of patients with CHC decreased over time(Z=67.716,P<0.01),while that of patients with NMNCHC increased(Z=153.05,P<0.01).The sex ratio varied among the different modes of infection,and it peaked at 17.65 for *** spatial analysis indicated spatial clustering,and the high-high clustering areas were mainly distributed in the southwestern and central-southern *** In China,PLWHA,aged≥50 years,were predominantly infected through heterosexual *** primary modes of infection were CHC and *** were variations in the sex ratio among different age groups,infected through various sexual ***/AIDS cases exhibited spatial *** on these results,the expansion of HIV testing,treatment,and integrated behavioral interventions in high-risk populations is recommended to enhance disease detection in key regions.

关键词： HIV/AIDS Aged≥50 years China

Scattering-based hybrid network for facial attribute classification

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Frontiers of Computer Science 2024年第3期18卷 105-116页

作者： Na LIU fan ZHANG Liang chang Fuqing DUAN School of Artificial Intelligence Beijing Normal UniversityBeijing 100875China

Face attribute classification(FAC)is a high-profile problem in biometric verification and face *** recent research has been devoted to extracting more delicate image attribute features and exploiting the inter-attribute correlations,significant challenges still *** scattering transform(WST)is a promising non-learned feature *** has been shown to yield more discriminative representations and outperforms the learned representations in certain *** to the image classification task,WST can enhance subtle image texture information and create local deformation *** paper designs a scattering-based hybrid block,to incorporate frequency-domain(WST)and image-domain features in a channel attention manner(Squeezeand-Excitation,SE),termed WS-SE *** with CNN,WS-SE achieves a more efficient FAC performance and compensates for the model sensitivity of the small-scale affine *** addition,to further exploit the relationships among the attribute labels,we propose a learning strategy from a causal *** cause attributes defined using the causalityrelated information can be utilized to infer the effect attributes with a high confidence *** analysis experiments demonstrate the effectiveness of our model,and our hybrid model obtains state-of-the-art results in two public datasets.

关键词： wavelet scattering transform causality-related learning facial attribute classification

Advanced nanofabrication for elastic inorganic aerogels

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Nano Research 2024年第10期17卷 8842-8862页

作者： Xiaota Cheng Xinyi chang fan Wu Yalong Liao Kai Pan Hao Fong Jianyong Yu yi-Tao Liu Bin Ding Innovation Center for Textile Science and Technology College of TextilesDonghua UniversityShanghai 201620China Aerospace Institute of Advanced Material and Processing Technology Beijing 100074China College of Materials Science and Engineering Beijing University of Chemical TechnologyBeijing 100029China

Inorganic aerogels with low density,high porosity,large specific surface area,and superior mechanical properties are excellent candidate materials in fields such as thermal management,energy,catalysis,and biomedical applications.A comprehensive overview of existing elastic inorganic aerogels is provided,covering their structural units,preparation methods,mechanical performances,and ***,based on the constituent building blocks and microstructures,a detailed analysis of the mechanical properties and guidelines for elastic design of aerogels is *** with a succinct summary of prospective developmental direction,this review deliberates on the challenges and potential opportunities of elastic inorganic aerogels,with the intent of providing a versatile platform for designing new types of elastic inorganic aerogels for various applications.

关键词： inorganic aerogels compressive stretchable fabrication mechanical performances applications

Disposal of zinc extraction residues via iron ore sintering process:an innovative resource utilization

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Journal of Iron and Steel Research International 2024年第7期31卷 1636-1645页

作者： Chun-long fan Cheng-yi Ding Tao Yang Yun-fei Luo yi-fan Wang Qian Li Hong-ming Long School of Metallurgical Engineering Anhui University of TechnologyMa'anshan 243002AnhuiChina Zhongye changtian International Engineering Co. Ltd.Changsha 410205HunanChina Key Laboratory of Metallurgical Emission Reduction and Resources Recycling(Ministry of Education) Anhui University of TechnologyMa'anshan 243002AnhuiChina

Zinc extraction residue,a solid waste generated from the treatment of zinc-containing dust in rotary kilns,is commonly stockpiled in steel companies for extended *** poses significant disposal challenges and environmental pollution *** far,research on the treatment of zinc extraction residues has been slow,inadequate,and *** this gap,a novel approach was proposed to effectively treat the zinc extraction residue via the iron ore sintering *** was feasible to add 1 wt.%of zinc extraction residues to the sintering raw *** more adequate mineralization reaction resulted in higher yield and tumbler indexes,despite a slight decrease in sintering *** this may result in a slight decrease in sintering speed,the more complete mineralization reaction leads to improved sintering yield and tumbler ***,the addition of zinc extraction residues reduced the CO and NO_(x) concentrations in the sintering flue ***,the iron ore sintering process provided a viable solution for resource utilization and environmentally friendly treatment of zinc extraction residues.

关键词： Zinc extraction residue Iron ore sintering Co-processing Waste utilization Gas pollutant reduction

Silicon dioxide-protection boosting the peroxidase-like activity of Fe single-atom catalyst for combining chemo-photothermal therapy

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Nano Research 2024年第6期17卷 4924-4933页

作者： Yu fan Yu yi Hongpan Rong Jiatao Zhang Beijing Key Laboratory of Construction-Tailorable Advanced Functional Materials and Green Applications School of Materials Science&EngineeringBeijing Institute of TechnologyBeijing 100081China CAS Center for Excellence in Nanoscience CAS KeyLaboratory for Biomedical Effects of Nanomaterials and NanosafetyNational Center for Nanoscience and Technology(NCNST)Beijing 100190China Key Laboratory of Medical Molecule Science and Pharmaceutics Engineering Ministry of Industry and Information TechnologySchool of Chemistry&Chemical EngineeringBeijing Key Laboratory of Construction-Tailorable Advanced Functional Materials and Green ApplicationsSchool of Materials Science and EngineeringBeijing Institute of TechnologyBeijing 100081China

Carbon-based single-atom catalysts(SACs)have been widely studied in the field of biomedicine due to their excellent catalytic ***,carbon-based SACs usually aggregate during pyrolysis,which leads to the reduction of catalytic ***,we describe a method to improve the monodispersion of SACs using silicon dioxide as a protective *** decoration of silicon dioxide serves as a buffer layer for individual nanoparticles,which is not destroyed during the pyrolysis process,ensuring the single-particle dispersion of the nanoparticles after *** approach increased the hydroxyl groups on the surface of Fe-SAC(Fe-SAC-SE)and improved its water solubility,resulting in a four times enhancement of the peroxidase(POD)-like activity of Fe-SAC-SE(58.4 U/mg)than that of non-protected SACs(13.9 U/mg).The SiO_(2)-protection approach could also improve the catalytic activities of SACs with other metals such as Mn,Co,Ni,and Cu,indicating its generality for SACs *** advantage of the high POD-like activity,photothermal properties,and large specific surface area of Fe-SAC-SE,we constructed a synergistic therapeutic system(Fe-SAC-SE@DOX@PEG)for combining the photothermal therapy,catalytic therapy,and *** was verified that the photothermal properties of Fe-SAC-SE@DOX@PEG could effectively improve its POD-like activity,exhibiting excellent tumor-killing performance at the cellular *** work may provide a general approach to improve the performances of SACs for disease therapy and diagnosis.

关键词： single-atom catalysts peroxidase-like activity SiO2-protection photothermal therapy catalytic therapy chemotherapy