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动之以情还是晓之以理?——环境治理中网络问政的政府回应话语模式

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社会发展研究 2021年第3期8卷 44-62,243页

作者：常多粉孟天广清华大学政治学系

随着人们环保意识的提高和网络问政时代的到来,网络环保诉求日益增多,如何回应公众的环保诉求直接反映着治理绩效,进而影响政府公信力。基于领导留言板的环保诉求和政府回应数据,本文运用有监督的机器学习和统计分析,从政府层级和机构... 详细信息

随着人们环保意识的提高和网络问政时代的到来,网络环保诉求日益增多,如何回应公众的环保诉求直接反映着治理绩效,进而影响政府公信力。基于领导留言板的环保诉求和政府回应数据,本文运用有监督的机器学习和统计分析,从政府层级和机构类型维度分析了政府回应的话语模式。研究发现,根据政府回应话语的情感色彩和法治化程度,回应话语模式可类型化为描述话语、共情话语、规则话语和混合话语四种模式;政府回应的话语模式受政府层级和机构类型的影响,其中层级越高越倾向于混合话语,层级越低越倾向于共情话语;党委办、信访、吸纳部门和监督部门等机构偏好共情话语,而政府办、业务部门则偏好规则话语。考察政府回应的话语模式及其制度逻辑,既有利于进一步规范政府回应模式、提高政府回应能力,也有利于提高公众参与积极性、促进政民互动。

关键词：环境治理网络问政政府回应话语模式

突发公共危机治理中的数字政府应用、信息获取与政府信任

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西安交通大学学报（社会科学版） 2020年第4期40卷 12-22页

作者：赵金旭傅承哲孟天广清华大学政治学系北京100084 华南师范大学政治与公共管理学院广东广州510006

伴随着政府数字化转型,数字政府应用蓬勃发展并已成为驱动国家治理现代化的新途径。基于“数字技术与公共卫生治理现代化”全国性网络问卷调查,从政治传播和公共服务两个角度考察数字政府应用对公众信息获取及政府信任的影响机制,进而... 详细信息

伴随着政府数字化转型,数字政府应用蓬勃发展并已成为驱动国家治理现代化的新途径。基于“数字技术与公共卫生治理现代化”全国性网络问卷调查,从政治传播和公共服务两个角度考察数字政府应用对公众信息获取及政府信任的影响机制,进而探讨数字政府应用的未来发展方向。研究发现,数字政府应用促进了疫情专业信息获取且可以有效抵制谣言扩散,传统数字政府应用比商业平台数字政府应用更能发挥积极作用;公众使用数字政府应用获取公共服务显著提升了政府信任;疫情专业信息获取促使公众提升对政府信息和能力的信任。未来数字政府建设应同时强化其政治传播和公共服务功能。

关键词：突发公共危机国家治理治理现代化疫情防治数字政府应用信息获取政府信任

Species-specific and generalized allometric biomass models for eight Fagaceae species in the understory of evergreen broadleaved forests in subtropical China

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Journal of Forestry Research 2024年第4期35卷 156-170页

作者： Shengwang meng Qianyanzhou Ecological Research Station Key Laboratory of Ecosystem Network Observation and ModelingInstitute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101People’s Republic of China

Quantifying the biomass of saplings in the regeneration component is critical for understanding biogeochemical processes of forest ***,accurate allometric equations have yet to be developed in sufficient *** develop species-specific and generalized allometric equations,154 saplings of eight Fagaceae tree species in subtropical China’s evergreen broadleaved forests were *** dendrometric variables,root collar diameter(d),height(h),and crown area(ca)were applied in the model by the weighted nonlinear seemingly unrelated regression *** only d as an input variable,the species-specific and generalized allometric equations estimated the aboveground biomass reasonably,with R _(adj)^(2) values generally>*** h and/or ca improved the fitting of some biomass components to a certain *** equations showed a relatively large coefficient of variation but comparable bias to species-specific *** in the absence of species-specific equations at a given location are generalized equations for mixed species *** developed regression equations can be used to accurately calculate the aboveground biomass of understory Fagaceae regeneration trees in China’s subtropical evergreen broadleaved forests.

关键词： Allometry Aboveground biomass Additivity Regeneration Subtropical China

高管公职经历、中央环保督察与企业环境绩效--基于A省企业层级数据的实证分析

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公共管理学报 2021年第1期18卷 114-125,173页

作者：王鸿儒陈思丞孟天广清华大学公共管理学院北京100084 清华大学社会科学学院北京100084

本文基于南方A省2011-2018年全样本的21374个企业层级的环境污染数据,通过匹配企业高管职务信息数据,定量分析了高管具有公职经历的企业在不同所有制下和中央环保督察下所展现出来的排污行为差异。研究发现:第一,国有企业高管"准公职人... 详细信息

本文基于南方A省2011-2018年全样本的21374个企业层级的环境污染数据,通过匹配企业高管职务信息数据,定量分析了高管具有公职经历的企业在不同所有制下和中央环保督察下所展现出来的排污行为差异。研究发现:第一,国有企业高管"准公职人员"的特征使得国有企业的相对排污水平较低,且这一影响随着行政隶属政府层级的提高而扩大;第二,高管公职经历对民营企业排污具有"庇护效应",高管具有公职的民营企业相对排污水平更高,这一效应因企业规模和地区监管强度而存在异质性;第三,中央环保督察不仅激励行政隶属层级较低的国有企业缩小排污水平,也显著打击了高管具有公职的民营企业的排污特权,有效地降低了其排污水平。本文降低了分析层级,运用企业层级的数据展现了企业高管公职经历在不同所有制企业中的不同影响,同时揭示了中央环保督察对于地方潜在政企合谋排污的抑制作用,为构造新型政商关系提供了理论依据和实践参考。

关键词：企业高管公职经历政商关系中央环保督察企业所有制排污水平

A vertical track nonlinear energy sink

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Applied Mathematics and Mechanics(English Edition) 2024年第6期45卷 931-946页

作者： meng LI Hu DING Shanghai Key Laboratory of Mechanics in Energy Engineering School of Mechanics and Engineering ScienceShanghai Frontier Science Center of MechanoinformaticsShanghai UniversityShanghai 200444China

Eliminating the effects of gravity and designing nonlinear energy sinks(NESs)that suppress vibration in the vertical direction is a challenging task with numerous damping *** this paper,the dynamic design of a vertical track nonlinear energy sink(VTNES)with zero linear stiffness in the vertical direction is proposed and realized for the first *** motion differential equations of the VTNES coupled with a linear oscillator(LO)are *** the strong nonlinearity considered of the VTNES,the steady-state response of the system is analyzed with the harmonic balance method(HBM),and the accuracy of the HBM is verified *** this basis,the VTNES prototype is manufactured,and its nonlinear stiffness is *** damping effect and dynamic characteristics of the VTNES are studied theoretically and *** results show that the VTNES has better damping effects when strong modulation responses(SMRs)***,even for small-amplitude vibration,the VTNES also has a good vibration suppression *** sum up,in order to suppress the vertical vibration,an NES is designed and developed,which can suppress the vertical vibration within certain ranges of the resonance frequency and the vibration intensity.

关键词： track nonlinear energy sink(TNES) vertical direction gravity nonlinear stiffness harmonic balance method(HBM) vibration control

Nested Saturated Control of Uncertain Complex Cascade Systems Using Mixed Saturation Levels

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IEEE/CAA Journal of Automatica Sinica 2024年第5期11卷 1163-1174页

作者： meng Li Zhigang Zeng Wuhan National Laboratory for Optoelectronics Wuhan 430074 School of Artificial Intelligence and Automation Huazhong University of Science and TechnologyWuhan 430074China School of Artificial Intelligence and Automation Huazhong University of Science and TechnologyWuhan 430074 Key Laboratory of Image Processing and Intelligent Control of Education Ministry of China Wuhan 430074China

This study addresses the problem of global asymptotic stability for uncertain complex cascade systems composed of multiple integrator systems and non-strict feedforward nonlinear systems. To tackle the complexity inherent in such structures, a novel nested saturated control design is proposed that incorporates both constant saturation levels and state-dependent saturation levels. Specifically, a modified differentiable saturation function is proposed to facilitate the saturation reduction analysis of the uncertain complex cascade systems under the presence of mixed saturation levels. In addition, the design of modified differentiable saturation function will help to construct a hierarchical global convergence strategy to improve the robustness of control design scheme. Through calculation of relevant inequalities, time derivative of boundary surface and simple Lyapunov function,saturation reduction analysis and convergence analysis are carried out, and then a set of explicit parameter conditions are provided to ensure global asymptotic stability in the closed-loop systems. Finally, a simplified system of the mechanical model is presented to validate the effectiveness of the proposed method.

关键词： method saturation differentiable

Adaptive admittance tracking control for interactive robot with prescribed performance

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Journal of Systems Engineering and Electronics 2024年第2期35卷 444-450页

作者： meng Qingrui LIN Yan School of Automation Science and Electrical Engineering Beihang UniversityBeijing 100190China College of Electrical Engineering and Automation Shandong University of Science and TechnologyQingdao 266590China

An adaptive control approach is presented in this paper for tracking desired trajectories in interactive manipulators. The controller design incorporates prescribed performance functions (PPFs) to improve dynamic performance. Notably, the performance of the output error is confined in an envelope characterized by exponential convergence, leading to convergence to zero. This feature ensures a prompt response from admittance control and establishes a reliable safety framework for interactions. Simulation results provide practical insights,demonstrating the viability of the control scheme proposed in this paper.

关键词： prescribed performance admittance control adaptive control robots

“软宣传”的兴起、特征与效果——基于2009-2023年主流媒体与政务新媒体的大数据分析

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新闻与传播研究 2023年第12期30卷 86-103+128页

作者：张开平孟天广黄种滨清华大学社会科学学院中国社会科学院社会学研究所

数字时代主流媒体向社交媒体场域的延伸与媒介形式的融合催生了宣传的迭代。基于2009至2023年全国94家主流媒体与政务新媒体的逾702万条微博数据的研究发现，过去十余年间主流媒体在新媒体场域呈现“软宣传”趋向。内容生产呈现亲民和... 详细信息

数字时代主流媒体向社交媒体场域的延伸与媒介形式的融合催生了宣传的迭代。基于2009至2023年全国94家主流媒体与政务新媒体的逾702万条微博数据的研究发现，过去十余年间主流媒体在新媒体场域呈现“软宣传”趋向。内容生产呈现亲民和服务属性的强化，正能量新闻比重稳步提升。宣传话语和形态发生迭代，情感动员、网络流行语和话题标签等传播方式形成了突出价值判断的政治话语。融合文字、图片和视频等媒介形式有助于更敏捷地传递主流价值观，形成传播力更强的新媒体宣传矩阵。亲民化报道显著提高了媒体与公众的互动，融媒体的使用提升了媒体的综合影响力，软宣传的传播效果存在异质性。基于社交媒体的“软宣传”在理念、话语和传播方式上与传统的“硬宣传”具有显著差别，体现出国家信息能力和濡化能力在数字时代的适应性提升。

关键词：宣传政治传播社交媒体主流媒体计算传播学

Cooperative User-Scheduling and Resource Allocation Optimization for Intelligent Reflecting Surface Enhanced LEO Satellite Communication

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China Communications 2024年第2期21卷 227-244页

作者： meng meng Bo Hu Shanzhi Chen Jianyin Zhang State Key Lab of Networking and Switching Technology Beijing University of Posts and TelecommunicationsBeijing 100876China State Key Lab of Wireless Mobile Communication China Academy of Telecommunication TechnologyBeijing 100191China Research Institute of China Mobile Beijing 100053China

Lower Earth Orbit(LEO) satellite becomes an important part of complementing terrestrial communication due to its lower orbital altitude and smaller propagation delay than Geostationary satellite. However, the LEO satellite communication system cannot meet the requirements of users when the satellite-terrestrial link is blocked by obstacles. To solve this problem, we introduce Intelligent reflect surface(IRS) for improving the achievable rate of terrestrial users in LEO satellite communication. We investigated joint IRS scheduling, user scheduling, power and bandwidth allocation(JIRPB) optimization algorithm for improving LEO satellite system *** optimization problem of joint user scheduling and resource allocation is formulated as a non-convex optimization problem. To cope with this problem, the nonconvex optimization problem is divided into resource allocation optimization sub-problem and scheduling optimization sub-problem firstly. Second, we optimize the resource allocation sub-problem via alternating direction multiplier method(ADMM) and scheduling sub-problem via Lagrangian dual method ***, we prove that the proposed resource allocation algorithm based ADMM approaches sublinear convergence theoretically. Finally, we demonstrate that the proposed JIRPB optimization algorithm improves the LEO satellite communication system throughput.

关键词： convex optimization intelligent reflecting surface LEO satellite communication OFDM