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CFSA-Net:Efficient Large-Scale Point Cloud Semantic Segmentation Based on Cross-Fusion Self-Attention

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Computers, Materials & Continua 2023年第12期77卷 2677-2697页

作者： Jun Shu Shuai Wang shiqi yu Jie Zhang School of Electrical and Engineering Hubei University of TechnologyWuhan430068China Hubei Key Laboratory for High-Efficiency Utilization of Solar Energy and Operation Control of Energy Storage System Hubei University of TechnologyWuhan430068China School of Mechanical and Electrical Engineering Wuhan Donghu UniversityWuhan430212China

Traditional models for semantic segmentation in point clouds primarily focus on smaller scales.However,in real-world applications,point clouds often exhibit larger scales,leading to heavy computational and memory requirements.The key to handling large-scale point clouds lies in leveraging random sampling,which offers higher computational efficiency and lower memory consumption compared to other sampling methods.Nevertheless,the use of random sampling can potentially result in the loss of crucial points during the encoding stage.To address these issues,this paper proposes cross-fusion self-attention network(CFSA-Net),a lightweight and efficient network architecture specifically designed for directly processing large-scale point clouds.At the core of this network is the incorporation of random sampling alongside a local feature extraction module based on cross-fusion self-attention(CFSA).This module effectively integrates long-range contextual dependencies between points by employing hierarchical position encoding(HPC).Furthermore,it enhances the interaction between each point’s coordinates and feature information through cross-fusion self-attention pooling,enabling the acquisition of more comprehensive geometric information.Finally,a residual optimization(RO)structure is introduced to extend the receptive field of individual points by stacking hierarchical position encoding and cross-fusion self-attention pooling,thereby reducing the impact of information loss caused by random sampling.Experimental results on the Stanford Large-Scale 3D Indoor Spaces(S3DIS),Semantic3D,and SemanticKITTI datasets demonstrate the superiority of this algorithm over advanced approaches such as RandLA-Net and KPConv.These findings underscore the excellent performance of CFSA-Net in large-scale 3D semantic segmentation.

关键词： Semantic segmentation large-scale point cloud random sampling cross-fusion self-attention

基于土地利用情景模拟的和田地区生态系统服务价值时空特征与交互驱动研究

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农业资源与环境学报 2024年第4期41卷 780-793页

作者：张朝辉于师琪石河子大学经济与管理学院新疆石河子832000

为探究生态系统服务价值(Ecosystem Services Value,ESV)时空演变规律与驱动机制,以新疆和田地区为研究区,耦合PLUS-Geodetector模型对2018—2034年土地利用情景进行模拟,并从产业发展角度分析其ESV变化趋势与驱动机制。本研究设置8类... 详细信息

为探究生态系统服务价值(Ecosystem Services Value,ESV)时空演变规律与驱动机制,以新疆和田地区为研究区,耦合PLUS-Geodetector模型对2018—2034年土地利用情景进行模拟,并从产业发展角度分析其ESV变化趋势与驱动机制。本研究设置8类土地利用类型和不同情景下的邻域权重,利用PLUS模型进行模拟得到2034年自然演变、经济优先、生态保护三种土地利用情景。结果表明:三种情景下,和田地区ESV总值均有所增加,其中生态保护情景增长量最高,经济优先情景最低;除南部山区、中北部水域附近为高值、次高值、中值区域外,ESV分布呈现出以低值、次低值区域为主,南高北低的总体特征;2010—2018年,和田地区ESV的大幅度变动主要集中在中部城镇发展轴邻近区域,而在2018—2034年,ESV的空间变化范围将进一步扩张,由农牧业、工业快速发展所带来的耕地、建设用地向城镇轴线南北两侧的迅速扩展是造成ESV空间变化的主要因素,经济优先情景下人造土地利用类型扩张速度更快,生态保护情景则与之相反。和田地区ESV现状与演化趋势是自然与产业因素综合作用的结果,自然因素对和田地区ESV驱动作用较社会经济因素更强,社会经济因素中牧业、工业具有更强的驱动作用,双因子交互作用的驱动力大于单因子,且各产业交互作用驱动力高于单产业。研究表明,不同的发展模式下和田地区ESV的数量与分布产生明显差异,而各产业内的各个因素及其交互作用对ESV的变化具有明显的驱动作用,根据ESV评估与驱动机制分析科学规划发展路线,对和田地区可持续、高质量发展具有重要意义。

关键词：生态系统服务价值情景模拟 PLUS模型驱动机制地理探测器和田地区

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潮流能水轮机阵列水动力与布局优化研究进展

河海大学学报（自然科学版） 2024年第3期52卷 79-87页

作者：张继生俞诗琪张灿李浩然王芳宇河海大学海岸灾害及防护教育部重点实验室江苏南京210098 河海大学港口海岸与近海工程学院江苏南京210098 深海技术科学太湖实验室江苏无锡214082

概述了潮流能水轮机阵列的水动力特性,总结了不同横向、纵向间距下水轮机尾流变化的一般规律,梳理了水轮机阵列布局的优化方法,从人工传统优化阵列布局与计算机自动优化阵列布局两方面回顾了水轮机阵列单目标优化与多目标优化的研究进... 详细信息

概述了潮流能水轮机阵列的水动力特性,总结了不同横向、纵向间距下水轮机尾流变化的一般规律,梳理了水轮机阵列布局的优化方法,从人工传统优化阵列布局与计算机自动优化阵列布局两方面回顾了水轮机阵列单目标优化与多目标优化的研究进展。人工传统布局结构简单且易于操作,有比较强的工程实践性,但物理试验可限制的约束条件有限,难以模拟阵列在真实海况下的发电情况;自动优化布局相比于人工传统布局更具有现实意义,但依然面临经济模块因素缺乏、多目标内容待完善、理论与实践未统一、前期准备时间较长等诸多挑战。

关键词：潮流能水轮机尾流规律阵列优化单目标优化多目标优化

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不同样本集划分策略对农作物遥感分类精度的影响

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河南农业科学 2024年第6期53卷 144-153页

作者：刘洋李强子杜鑫王红岩张源张喜旺沈云祺张思宸余仕奇中国科学院空天信息创新研究院北京100101 中国科学院大学北京100049 河南大学河南郑州475001

农作物分布的提取精度对于后续的农田参数反演和作物单产估算等均具有深刻的影响,而农作物分类识别过程中,训练样本的准确性和数量对其最终分类结果的影响是至关重要的。针对样本较少且分布不均匀的问题,通过实地标识和目视解译2种方式... 详细信息

农作物分布的提取精度对于后续的农田参数反演和作物单产估算等均具有深刻的影响,而农作物分类识别过程中,训练样本的准确性和数量对其最终分类结果的影响是至关重要的。针对样本较少且分布不均匀的问题,通过实地标识和目视解译2种方式构建农作物分类样本数据集,设计5种样本数据集构建方案:方案(1)全部采用实测样点(70%训练、30%验证);方案(2)全部采用目视解译样点(70%训练、30%验证);方案(3)实测样点与目视样点分别选取相同比例的训练样本与验证样本,再结合构建训练样本集与验证样本集(70%训练、30%验证);方案(4)目视解译样点作为训练样本,实测样点作为验证样本;方案(5)目视样点与实测样点选取相同数量的样本进行结合构建样本集(70%训练、30%验证)。研究不同方案下的农作物遥感分类精度。结果表明,除方案(4)外,(1)(2)(3)(5)4种样本数据集划分方案的整体精度均在95%以上,分类结果较好,表明采用目视解译补充样本点,可以有效解决样本点较少和分布不均匀的情况。方案(3)作为研究区作物识别提取的最佳分类方案,总体精度达到97.6%,Kappa系数达到0.970,且玉米、水稻、大豆单类精度均超过97%,表明目视解译样点与实测样点分别选取训练样本与验证样本再结合构建训练样本集与验证样本集,不仅可以提升分类结果的精度,而且可以提高分类结果的真实性、准确性。

关键词：遥感农作物分类目视解译样本集划分

Weizmannia coagulans:an ideal probiotic for gut health

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Food Science and Human Wellness 2024年第1期13卷 16-26页

作者： shiqi Zhang Pinglan Li Suwon Lee yu Wang Chunming Tan Nan Shang Key Laboratory of Functional Dairy Ministry of EducationCollege of Food Science and Nutritional EngineeringChina Agricultural UniversityBeijing 100083China Coree Beijing Co. Ltd.Beijing 101312China Key Laboratory of Precision Nutrition and Food Quality Department of Nutrition and HealthChina Agricultural UniversityBeijing 100083China College of Engineering China Agricultural UniversityBeijing 100083China

Weizmannia coagulans(formerly Bacillus coagulans)is a spore-forming and lactic acid-producing bacterium.It has recently attracted much attention from researchers and food manufacturers due to its probiotic functions and stability in processing and storage.W.coagulans is capable of improving gut health through the regulation of gut microbiota,modulation of immunity,and improving digestibility and metabolism.Spores,germinated cells and metabolites of W.coagulans modulate the gut micro-environment and further affect other organs.W.coagulans is an environment-friendly probiotic since it can contribute to the host by reconstructing the balance of gut microbiota and only temporarily resides in the intestine after administration.W.coagulans has been generally recognized as safe(GRAS)by the US Food and Drug Administration(FDA),thus it is an ideal probiotic for improving gut health.The merit of its stability in processing and storage provides W.coagulans spores many possibilities for its use in various types of functional foods.This review presents an overview of the characteristics of W.coagulans that make it an ideal probiotic candidate and highlights the proposed health benefits with scientific evidence conferred by the administration of W.coagulans.

关键词： Weizmannia coagulans Spore former Probiotics Microbiota Gut disorders

Spi1 regulates the microglial/macrophage inflammatory response via the PI3K/AKT/mTOR signaling pathway after intracerebral hemorrhage

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Neural Regeneration Research 2024年第1期19卷 161-170页

作者： Guoqiang Zhang Jianan Lu Jingwei Zheng Shuhao Mei Huaming Li Xiaotao Zhang An Ping shiqi Gao yuanjian Fang Jun yu Department of Neurosurgery The Second Affiliated Hospital of Zhejiang University School of MedicineHangzhouZhejiang ProvinceChina Department of Neurosurgery Huashan Hospital of Fudan University School of MedicineShanghaiChina Clinical Research Center for Neurological Diseases of Zhejiang Province HangzhouZhejiang ProvinceChina Key Laboratory of Precise Treatment and Clinical Translational Research of Neurological Diseases HangzhouZhejiang ProvinceChina

Preclinical and clinical studies have shown that microglia and macrophages participate in a multiphasic brain damage repair process following intracerebral hemorrhage.The E26 transformation-specific sequence-related transcription factor Spi1 regulates microglial/macrophage commitment and maturation.However,the effect of Spi1 on intracerebral hemorrhage remains unclear.In this study,we found that Spi1 may regulate recovery from the neuroinflammation and neurofunctional damage caused by intracerebral hemorrhage by modulating the microglial/macrophage transcriptome.We showed that high Spi1expression in microglia/macrophages after intracerebral hemorrhage is associated with the activation of many pathways that promote phagocytosis,glycolysis,and autophagy,as well as debris clearance and sustained remyelination.Notably,microglia with higher levels of Soil expression were chara cterized by activation of pathways associated with a variety of hemorrhage-related cellular processes,such as complement activation,angiogenesis,and coagulation.In conclusion,our results suggest that Spi1 plays a vital role in the microglial/macrophage inflammatory response following intracerebral hemorrhage.This new insight into the regulation of Spi1 and its target genes may advance our understanding of neuroinflammation in intracerebral hemorrhage and provide therapeutic targets for patients with intracerebral hemorrhage.

关键词： intracerebral hemorrhage macrophage microglia neuroinflammation phagocytosis PI3K/AKT/mTOR signaling pathway Spi1 transcriptomics

Mn-based cathode materials for rechargeable batteries

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Science China Chemistry 2024年第1期67卷 87-105页

作者： Xu Zhang shiqi Liu Boya Wang Guoqing Wang Haozhe Du Xuanyu Wang Haidong Zhang Shu Zhao Lin Wang Haijun yu Institute of Advanced Battery Materials and Devices Faculty of Materials and ManufacturingBeijing University of TechnologyBeijing 100124China Key Laboratory of Advanced Functional Materials Ministry of EducationBeijing University of TechnologyBeijing 100124China Create Energy&Benefit Future Co.Ltd. Beijing 100176China

The rapid expansion of renewable energies asks for great progress of energy-storage technologies for sustainable energy supplies,which raises the compelling demand of high-performance rechargeable batteries.To satisfy the huge demand from the coming energy-storage market,the resource and cost-effectiveness of rechargeable batteries become more and more important.Manganese(Mn)as a key transition element with advantages including high abundance,low cost,and low toxicity derives various kinds(spinels,layered oxides,polyanions,Prussian blue analogs,etc.)of high-performance Mn-based electrode materials,especially cathodes,for rechargeable batteries ranging from Li-ion batteries,Na-ion batteries,aqueous batteries,to multivalent metal-ion batteries.It is anticipated that Mn-based materials with Mn as the major transition-metal element will constitute a flourishing family of Mn-based rechargeable batteries(Mn RBs)for large-scale and differentiated energy-storage applications.On the other hand,several critical issues including Jahn-Teller effect,Mn dissolution,and O release greatly hinder the pace of Mn RBs,which require extensive material optimizations and battery/system improvements.This review aims to provide an investigation about Mn-based materials and batteries for the coming energy-storage demands,with compelling issues and challenges that must be overcome.

关键词： manganese cathode materials Mn-based rechargeable batteries energy storage

Regulation of different light conditions for efficient biomass production and protein accumulation of Spirulina platensis

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Journal of Oceanology and Limnology 2024年第1期42卷 174-186页

作者： yufei ZHANG Xianjun LI yuhui LI shiqi LIU Yanrui CHEN Miao JIA Xin WANG Lu ZHANG Qiping GAO Liang ZHANG Daoyong yu Baosheng GE State Key Laboratory of Heavy Oil Processing and Center for Bioengineering and Biotechnology China University of Petroleum(East China)Qingdao 266580China Tongwei Co. Ltd.Healthy Aquaculture Key Laboratory of Sichuan ProvinceChengdu 610093China

Light plays an important role in the photosynthesis and metabolic process of microalgae.However,how different light conditions regulate the biomass production and protein accumulation of microalgae is mostly unknown.In this study,the influence of different light conditions,including light colors,densities,and light:dark cycles on the cell growth and biochemical composition of Spirulina platensis was symmetrically characterized.Under different colored lights,S.platensis all shows an increase trend within the increased light intensity ranges;however,each showing different optimal light intensities.At the same light intensity,different colored lights show different growth rate of S.platensis following the sequence of red>white>green>yellow>blue.The maximum growth rate and protein accumulation were determined as 21.88 and 5.10 mg/(L·d)when illuminated under red LED.The energy efficiency of different light sources was calculated and ranked as red>white>blue≈green>yellow.Transcriptomic analysis suggests that red light can promote cell growth and protein accumulation by upregulating genes related to photosynthesis,carbon fixation,and C-N metabolism pathways.This study provides a conducive and efficient way to promote biomass production and protein accumulation of S.platensis by regulating light conditions.

关键词： microalgae light emitting diode protein accumulation biomass production transcriptomic analysis

Silkworm pupa peptide ameliorates dextrose sodium sulfate-induced colitis by enhancing gut barriers and modifying gut flora

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Food Science and Human Wellness 2024年

作者： Yaxi Zhou Diandian Wang Hao Duan shiqi Zhou Jinhong Guo yu Guo Jian Zhao Wenjie Yan Beijing Key Laboratory of Bioactive Substances and Functional Food College of Biochemical Engineering Beijing Union University

The anti-inflammatory properties of silkworm pupa peptide (SPP) have been recognized for their potential benefits in colitis treatment. However， the underlying mechanism of SPP in colitis animal models remains unclear. The objective of our work was to investigate the improving effect and the mechanism of action of SPP on a mouse model of dextrose sodium sulfate (DSS)-induced colitis. The findings suggested that SPP effectively eased ulcerative colitis (UC) symptoms in mice by decreasing disease activity index， ameliorating histopathological injury， and decreasing serum and colonic markers of inflammation. In addition， our research findings demonstrated that SPP restored intestinal barrier function by increasing the production of tight junction proteins such as zonula occludens-1 (ZO-1)， claudin-1， claudin-3， occludin， and adherens junction protein E-cadherin1. Further， SPP supplementation enhanced the concentration of short-chain fatty acids and positively altered the makeup of the gut bacteria in the mice’s gut. These findings underscore SPP’s ability to slow the progression of colitis and point to its possible use as a functional component in dietary supplements for the prevention of early-stage colitis.

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