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基于特征校正的多对抗域适应方法

电信科学 2024年第1期40卷 71-82页

作者：张永刘昊双章琪刘文哲湖州师范学院信息工程学院浙江湖州313000 辽宁师范大学计算机与信息技术学院辽宁大连116081

领域自适应可以通过对齐源域和目标域的分布将有标签的源域信息迁移到没有标签但相关的目标域。然而,现有的大多数方法仅对源域和目标域的低层特征分布进行对齐,无法捕获样本中的细粒度信息。基于此,提出了一种基于特征校正的多对抗域... 详细信息

领域自适应可以通过对齐源域和目标域的分布将有标签的源域信息迁移到没有标签但相关的目标域。然而,现有的大多数方法仅对源域和目标域的低层特征分布进行对齐,无法捕获样本中的细粒度信息。基于此,提出了一种基于特征校正的多对抗域适应方法。该方法在引入注意力机制以突出可迁移区域的基础上,通过部署特征校正模块对齐两个域之间的高级特征分布,进一步缩小域差异。此外,为了避免单个分类器过度拟合其自身的噪声伪标签,还提出了双分类器协同训练,并利用图神经网络特征聚合的特性生成更精准的源域标签。在3个迁移学习基准数据集上的大量实验证明所提方法的有效性。

关键词：领域自适应迁移学习对抗网络注意力机制

利用冰冻切片机快速制作木质茎的显微切片技术

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西北植物学报 2024年第7期44卷 1164-1168页

作者：马芳宋玉霞刘文哲西北大学生命科学学院西安710069 宁夏大学民族预科教育学院银川750021 宁夏农林科学院农业生物技术中心银川750002

【目的】植物的木质茎因次生维管组织含量多、细胞壁木质化程度高、质地较硬,所以徒手切片和石蜡切片均难以获得满意的切片效果。冰冻切片机可对一定硬度的组织进行切片,是植物木质茎制片的有效工具之一。【方法】利用冰冻切片机对一些... 详细信息

【目的】植物的木质茎因次生维管组织含量多、细胞壁木质化程度高、质地较硬,所以徒手切片和石蜡切片均难以获得满意的切片效果。冰冻切片机可对一定硬度的组织进行切片,是植物木质茎制片的有效工具之一。【方法】利用冰冻切片机对一些质地均匀、含水量较高的幼小木质茎直接切片;对木质坚硬、含水量较少的茎,经过FAA固定液固定、OCT包埋后(-30)~(-25)℃冰冻切片,再用0.1%甲苯胺蓝染色,显微镜观察并拍照染色效果。【结果】来源于乔木或灌木,直径不超过6 cm的木质茎,利用冰冻切片均可快速获得结构完整、图像清晰、色彩丰富的显微结构图像。【结论】冰冻切片机可用于幼小木质茎的显微切片制作,结合甲苯胺蓝染色,具有简便、高效、易操作的优点。

关键词：木质茎冰冻切片显微结构

High-efficiency nonlocal reflection-type vortex beam generation based on bound states in the continuum

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National Science Review 2023年第5期10卷 201-207页

作者： Tongyu Li Jiajun Wang Wenjie Zhang Xinhao Wang wenzhe liu Lei Shi Jian Zi State Key Laboratory of Surface Physics Key Laboratory of Micro-and Nano-Photonic Structures (Ministry of Education) and Department of PhysicsFudan University Department of Physics The Hong Kong University of Science and Technology

Momentum-space polarization vortices centered at symmetry-protected bound states in the continuum of a periodic structure,*** crystal slab,provide a novel nonlocal approach to generate vortex *** approach enjoys a great convenience of no precise alignment requirements,although the generation efficiency of the nonlocal generators requires further optimization before the practical *** this work,we propose a temporal-coupled-mode-theory-based guideline for high-efficiency nonlocal reflection-type vortex generator *** conversion efficiency of the vortex beam is found to be limited by the ratio of the radiative loss to the intrinsic absorption in practical *** increase this ratio through mode selection and structure design,the photonic crystal slabs are theoretically designed and experimentally characterized,showing a maximum on-resonance conversion efficiency of up to 86%.Combining high efficiency with simple fabrication and no re quirement for precise alignment,reflection-type photonic crystal slabs could offer a new and competitive way to generate vortex beams flexibly.

关键词： photonic crystal slab vortex beam bound states in the continuum

Non-Convex Optimization of Resource Allocation in Fog Computing Using Successive Approximation

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Journal of Systems Science & Complexity 2024年第2期37卷 805-840页

作者： LI Shiyong liu Huan LI wenzhe SUN Wei School of Economics and Management Yanshan UniversityQinhuangdao 066000China

Fog computing can deliver low delay and advanced IT services to end users with substantially reduced energy ***,with soaring demands for resource service and the limited capability of fog nodes,how to allocate and manage fog computing resources properly and stably has become the ***,the paper investigates the utility optimization-based resource allocation problem between fog nodes and end users in fog *** authors first introduce four types of utility functions due to the diverse tasks executed by end users and build the resource allocation model aiming at utility ***,for only the elastic tasks,the convex optimization method is applied to obtain the optimal results;for the elastic and inelastic tasks,with the assistance of Jensen’s inequality,the primal non-convex model is approximated to a sequence of equivalent convex optimization problems using successive approximation ***,a two-layer algorithm is proposed that globally converges to an optimal solution of the original ***,numerical simulation results demonstrate its superior performance and *** with other works,the authors emphasize the analysis for non-convex optimization problems and the diversity of tasks in fog computing resource allocation.

关键词： Fog computing non-convex optimization optimal resource allocation successive approximation method utility function

A Two-stage Service-oriented Task Offloading Framework with Edge-cloud Collaboration:A Game Theory Approach

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Journal of Systems Science and Systems Engineering 2024年第5期33卷 521-551页

作者： Shiyong Li wenzhe Li Huan liu Wei Sun School of Economics and Management Yanshan UniversityQinhuangdao 066004

With the fast development of Mobile Internet,data traffic generated by end devices is anticipated to witness substantial growth in the future ***,processing tasks locally will cause latency due to the limited resources of the end ***-cloud collaboration,an effective solution for latency-sensitive applications,is attracting greater attention from both industry and *** combines the advantages of the cloud center with abundant computing resources and edge nodes with low-latency *** this paper,we propose a two-stage task offloading framework with edge-cloud collaboration to assist end devices processing latency-sensitive tasks either on the edge servers or in the cloud *** for homogeneous task offloading,in the first stage,the competitive end devices offload tasks to the edge *** formulate the selfish task offloading problem among end devices as a potential *** the second stage,the edge nodes request resources from the cloud center to process end devices tasks due to their limited ***,we consider the heterogeneous task offloading problem and use intelligent optimization algorithm to obtain the optimal offloading *** results show that the service prices of edge nodes influence the decisions and task offloading costs of end *** also verify the intelligent optimization algorithm can achieve optimal performance with low complexity and fast convergence.

关键词： Edge-cloud collaboration task offloading potential game simulation annealing algorithm

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燃煤机组锅炉负荷偏差分析模型与评价系统

锅炉技术 2024年第3期55卷 19-27页

作者：陈冬林蒋权胡章茂殷立国杨宁武刘文哲张博长沙理工大学能源与动力工程学院湖南长沙410114 中国大唐集团有限公司北京100033 大唐华银电力股份有限公司湖南长沙410111 湖南大唐先一科技有限公司湖南长沙410111

“双碳”大背景下我国上网新能源装机发展十分迅速。为了加大电网对新能源发电的消纳,燃煤发电机组频繁参与深度调峰导致了机组实际负荷与自动发电控制(AGC)指令负荷出现较大偏差。针对这一技术难题,以锅炉及其辅助设备为对象,研究构建... 详细信息

“双碳”大背景下我国上网新能源装机发展十分迅速。为了加大电网对新能源发电的消纳,燃煤发电机组频繁参与深度调峰导致了机组实际负荷与自动发电控制(AGC)指令负荷出现较大偏差。针对这一技术难题,以锅炉及其辅助设备为对象,研究构建了锅炉机组本体及其辅助设备的实际出力模型、应有出力模型和最大出力模型,建立了用以分析评价锅炉机组负荷偏差原因及诊断与预警的分析评价系统,并将该系统在电厂中进行了验证。结果表明:该分析评价系统可有效地对锅炉及其辅助设备的出力故障进行早期预警和诊断,可有效提高机组运行的可靠性、安全性与经济性。

关键词：燃煤机组锅炉负荷偏差系统开发

Routing valley exciton emission of a WS_(2) monolayer via delocalized Bloch modes of in-plane inversion-symmetry-broken photonic crystal slabs

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Light(Science & Applications) 2020年第1期9卷 603-610页

作者： Jiajun Wang Han Li Yating Ma Maoxiong Zhao wenzhe liu Bo Wang Shiwei Wu Xiaohan liu Lei Shi Tian Jiang Jian Zi State Key Laboratory of Surface Physics Key Laboratory of Micro-and Nano-Photonics Structures(Ministry of Education)and Department of PhysicsFudan University200433 ShanghaiChina College of Advanced Interdisciplinary Studies National University of Defense Technology410073 ChangshaChina Collaborative Innovation Center of Advanced Microstructures Nanjing University210093 NanjingChina

The valleys of two-dimensional transition metal dichalcogenides(TMDCs)offer a new degree of freedom for information *** take advantage of this valley degree of freedom,on the one hand,it is feasible to control valleys by utilizing different external stimuli,such as optical and electric *** the other hand,nanostructures are also used to separate the valleys by near-field ***,for both of the above methods,either the required low-temperature environment or low degree of coherence properties limit their further ***,we demonstrate that all-dielectric photonic crystal(PhC)slabs without in-plane inversion symmetry(C_(2) symmetry)can separate and route valley exciton emission of a WS2 monolayer at room *** with circularly polarized photonic Bloch modes of such PhC slabs,valley photons emitted by a WS_(2) monolayer are routed directionally and are efficiently separated in the far *** addition,far-field emissions are directionally enhanced and have long-distance spatial coherence properties.

关键词： valley symmetry Bloch

行政合理性原则在行政处罚中的理解与适用——对一起职业健康检查机构未按规定保管病历资料案的分析和思考

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卫生法学 2024年第5期32卷 96-100,106页

作者：周世红丁凯罗剑宇李季刘文哲成都市卫生计生监督执法支队成都610000 成都市卫生健康委员会政策法规与体制改革处成都610000

本案是一起对职业健康检查违规违法行为进行查处的案例。执法人员在监督检查过程中,对多个违法行为的合理性进行了细致、深入的思考和论证,最后根据每个行为的具体情况分别作出了行政处罚或者不予认定的决定。本案对合理性原则的理解、... 详细信息

本案是一起对职业健康检查违规违法行为进行查处的案例。执法人员在监督检查过程中,对多个违法行为的合理性进行了细致、深入的思考和论证,最后根据每个行为的具体情况分别作出了行政处罚或者不予认定的决定。本案对合理性原则的理解、适用及思辨过程,对于一线监督执法具有非常大的借鉴意义。从案情介绍、案例分析和思考建议等三个方面进行深入剖析,帮助基层执法人员进一步理解和掌握行政合理性原则,提升执法办案能力水平。

关键词：职业健康不予处罚主观故意

The de novo genome assembly of Tapiscia sinensis and the transcriptomic and developmental bases of androdioecy

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Horticulture Research 2020年第1期7卷 219-234页

作者： Peng Zhao Guiliang Xin Feng Yan Huan Wang Xiaolong Ren Keith Woeste wenzhe liu Key Laboratory of Resource Biology and Biotechnology in Western China Ministry of EducationCollege of Life SciencesNorthwest UniversityXi’anShaanxi 710069China USDA Forest Service Hardwood Tree Improvement and Regeneration Center(HTIRC) Department of Forestry and Natural ResourcesPurdue University715 West State StreetWest LafayetteIN 47907USA

Tapiscia sinensis(Tapisciaceae)possesses an unusual androdioecious breeding system that has attracted considerable interest from evolutionary *** aspects of *** biology,including its biogeography,genomics,and sexlinked genes,are ***,we report the first de novo assembly of the genome of *** genome size was 410 Mb,with 22,251 predicted *** on whole-genome resequencing of 55 trees from 10 locations,an analysis of population genetic structure indicated that *** has fragmented into five lineages,with low intrapopulation genetic diversity and little gene flow among *** comparing whole-genome scans of male versus hermaphroditic pools,we identified 303 candidate sex-linked genes,79 of which(25.9%)were located on scaffold 25.A 24-kb region was absent in hermaphroditic individuals,and five genes in that region,TsF-box4,TsF-box10,TsF-box13,TsSUT1,and TsSUT4,showed expression differences between mature male and hermaphroditic *** results of this study shed light on the breeding system evolution and conservation genetics of the Tapisciaceae.

关键词： breeding flowers bases