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Entropy-based guidance and predictive modelling of pedestrians’visual attention in urban environment

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Building Simulation 2024年第10期17卷 1659-1674页

作者： Qixu xie Li Zhang Department of Architecture School of ArchitectureTsinghua UniversityBeijing 100084China Urban Ergonomics Lab School of ArchitectureTsinghua UniversityBeijing 100084China

Selective visual attention determines what pedestrians notice and ignore in urban *** consistency exists between different individuals’visual attention,designers can modify design by underlining mechanisms to better meet user ***,the mechanism of pedestrians’visual attention remains poorly understood,and it is challenging to forecast which position will attract pedestrians more in urban *** address this gap,we employed 360°video and immersive virtual reality to simulate walking scenarios and record eye movement in 138 *** findings reveal a remarkable consistency in fixation distribution across individuals,exceeding both chance and orientation *** driver of this consistency emerges as a strategy of information maximization,with participants tending to fixate areas of higher local ***,we built the first eye movement dataset for panorama videos of diverse urban walking scenes,and developed a predictive model to forecast pedestrians’visual attention by supervised deep *** predictive model aids designers in better understanding how pedestrians will visually interact with the urban environment during the design phase.

关键词： visual attention pedestrian eye-tracking local entropy deep learning urban ergonomics

Turbulence Statistics of Thermo-Buoyancy Supercritical Fuel Flow in a Regenerative Cooling Channel

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Journal of Thermal Science 2024年第1期33卷 126-137页

作者： SUN Feng xie Gongnan School of Marine Science and Technology Northwestern Polytechnical UniversityXi'an 710072China Department of Thermal Engineering Tsinghua UniversityBeijing 100084China

Active regenerative cooling with supercritical hydrocarbon fuel is considered as the most promising thermal protection *** existence of buoyancy force would lead to strongly anisotropic flow and thermal transport *** is closely related to the cooling performance of the *** elucidate the mechanisms of turbulent transport,the large eddy simulation(LES) was performed to assess turbulence statistics within different turbulence *** results indicated that the buoyancy and inertial force together dominated the change of turbulent ***,the spatial thermal buoyancy effect significantly suppressed the vertical velocity *** is due to the laminar motion caused by the buoyancy force,thereby weakening the thermal *** the statistics of velocity fluctuation,it was found that the buoyancy force and inertial force greatly weaken the vertical and streamwise velocity fluctuation,*** the statistics of thermal transport,the results pointed out that the near-wall heat transport characteristics need to be paid more *** thickness of the temperature mixing boundary layer led to the attenuation of vertical heat flux,which inhibited vertical temperature diffusion and predisposed to extreme conditions of heat transfer *** results can enhance the academic understanding of the heat transfer mechanism of supercritical fluids,and give guidance for further applications of thermal protection.

关键词： active regenerative cooling large eddy simulation(LES) buoyancy force turbulence statistics

Multi-algorithm Fusion Framework for Energy Prediction of Energy Harvesting IoT Node and Implementation

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Chinese Journal of Electronics 2020年第5期29卷 952-958页

作者： LI Xiangyu xie Nijie Institute of Microelectronics Tsinghua University Beijing National Research Center for Information Science and Technology

Accurate harvested energy prediction of the energy harvesting Internet-of-things(IoT) nodes is the basis of the proper power management and should be lowoverhead. A new multi-algorithm fusion framework, which merges results of multiple prediction algorithms to achieve a higher accuracy, has been proposed. A three-algorithm fusion solar radiation predictor was implemented. The experiments using the real solar radiation data show that it improves the percentage prediction error by 10%–26% for different prediction intervals. Its complexity is low enough to run on the embedded systems in real-time.

关键词： Energy harvesting Energy prediction Multi-algorithm fusion Internet-of-things

A self-adaptive grey forecasting model and its application

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Journal of Systems Engineering and Electronics 2022年第3期33卷 665-673页

作者： TANG Xiaozhong xie Naiming College of Economics and Management Nanjing University of Aeronautics and AstronauticsNanjing 211106China Department of Industry and Finance Huangshan Vocational and Technical CollegeHuangshan 245000China

GM(1,1)models have been widely used in various fields due to their high performance in time series ***,some hypotheses of the existing GM(1,1)model family may reduce their prediction performance in some *** solve this problem,this paper proposes a self-adaptive GM(1,1)model,termed as SAGM(1,1)model,which aims to solve the defects of the existing GM(1,1)model family by deleting their modeling ***,a novel multi-parameter simultaneous optimization scheme based on firefly algorithm is proposed,the proposed multi-parameter optimization scheme adopts machine learning ideas,takes all adjustable parameters of SAGM(1,1)model as input variables,and trains it with firefly *** Sobol’sensitivity indices are applied to study global sensitivity of SAGM(1,1)model parameters,which provides an important reference for model parameter ***,forecasting capability of SAGM(1,1)model is illustrated by Anhui electricity consumption *** show that prediction accuracy of SAGM(1,1)model is significantly better than other models,and it is shown that the proposed approach enhances the prediction performance of GM(1,1)model significantly.

关键词： grey forecasting model GM(1,1)model firefly algo-rithm Sobol’sensitivity indices electricity consumption prediction

Consensus Analysis of Fractional Multi-Agent Systems with Delayed Distributed PI Controller

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Journal of Systems Science & Complexity 2023年第1期36卷 205-221页

作者： xie Yingkang MA Qian School of Automation Nanjing University of Science and TechnologyNanjing 210094China

The consensus problem for fractional multi-agent systems(MASs)with time delay is *** distributed fractional proportional-integral(PI)-type controller is designed so that the consensus of the proposed systems is ***,explicit condition to determine the crossing directions is *** results show that with the increase of time delay,the closed-loop system has two different dynamic characteristics:From consensus to nonconsensus and consensus ***,delay margin within which consensus of MASs will always hold is *** results should provide useful guidelines in the consensus analysis and in the analytical design of the distributed controllers.

关键词： Consensus switching crossing direction fractional multi-agent systems fractional PI controller time delay

Shape Memory Polymers:Ever Evolving Shape Morphing Characteristics

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Chinese Journal of Polymer Science 2023年第3期41卷 325-326页

作者： Tao xie State Key Laboratory of Chemical Engineering College of Chemical and Biological EngineeringZhejiang University

Shape memory effect (SME) of polymers refers to their ability to fix temporary shapes and revert to their permanent shapes in an on demand *** the permanent shape is typically determined by the molding processes,the temporary shape(s) can be arbitrarily defined by an external force applied during the programming step(or shape fixing step).This attribute differentiates shape memory polymers (SMP) from many other classes of stimuli-responsive shape-changing polymers,in terms of both the material behaviors and potential applications.

关键词： permanent arbitrarily programming

Strategies for enhancing conductivity of colloidal nanocrystals and their photoelectronic applications

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Journal of Energy Chemistry 2020年第9期29卷 29-42,I0002页

作者： Fen Qiao Yi xie School of Energy&Power Engineering Jiangsu UniversityZhenjiang 212013JiangsuChina State Key Laboratory of Silicate Materials for Architectures Wuhan University of TechnologyWuhan 430070HubeiChina

Semiconductor colloidal nanocrystals(NCs)have size-and shape-dependent optoelectronic properties due to the quantum confinement effect,and are considered to be promising optoelectronic *** them,Ⅱ-Ⅵ(CdSe,CdS,CdTe,etc.)andⅣ-Ⅵ(PbSe,PbTe,PbS,etc.)have been widely studied as representative colloidal ***,the surfactant used in its synthesis progress results in the NCs surface covered by an insulating shell,which greatly affects the exciton separation and carrier transport of colloidal NCs-based photovoltaic ***,how to design high-efficiency optoelectronic devices by improving the transport performance of carriers has been a great *** key issues in the research ofⅡ-Ⅵ(CdSe,CdS,CdTe,etc.)andⅣ-Ⅵ(PbSe,PbTe,PbS,etc.)colloidal NCs were summarized,including synthesis strategy,morphology/size adjustment,surface ligand design,improvement of conductivity and their optoelectronic *** influence of surface ligands on the stability and dispersion of NCs was firstly introduced,and then strategies of improving electrical conductivity of NCs were discussed,such as ligands exchange,doping,self-assembly and plasmons,which provided a good foundation for the subsequent preparation of optoelectronic *** future development direction of NCs optoelectronic devices is expounded from the aspects of materials composition,comprehensive preparation and flexible processing of colloidal NCs.

关键词： Colloidal nanocrystal Surface engineering Conductivity Photoelectronic device

Biological mechanisms driving the seasonal changes in the internal loading of phosphorus in shallow lakes

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Science China Earth Sciences 2006年第z1期49卷 14-27页

作者： xie Ping Donghu Experimental Station of Lake Ecosystems State Key Laboratory of Freshwater Ecology and Biotechnology of ChinaInstitute of Hydrobiology Chinese Academy of Sciences Wuhan 430072 China

Because of the obvious importance of P as a nutrient that often accelerates growth of phytoplankton (including toxic cyanobacteria) and therefore worsens water quality, much interest has been devoted to P exchange across the sediment-water interface. Generally, the release mode of P from the sediment differed greatly between shallow and deep lakes, and much of the effort has been focused on iron and oxygen, and also on the relevant environmental factors, for example, turbulence and decomposition, but a large part of the P variation in shallow lakes remains unexplained. This paper reviews experimental and field studies on the mechanisms of P release from the sediment in the shallow temperate (in Europe) and subtropical (in the middle and lower reaches of the Yangtze River in China) lakes, and it is suggested that pH rather than DO might be more important in driving the seasonal dynamics of internal P loading in these shallow lakes, i.e., intense photosynthesis of phytoplankton increases pH of the lake water and thus may increase pH of the surface sediment,leading to enhanced release of P (especially iron-bound P) from the sediment. Based on the selective pump of P (but not N) from the sediment by algal blooms, it is concluded that photosynthesis which is closely related to eutrophication level is the driving force for the seasonal variation of internal P loading in shallow lakes. This is a new finding. Additionally, the selective pump of P from the sediment by algal blooms not only explains satisfactorily why both TP and PO4-P in the hypereutrophic Lake Donghu declined significantly since the mid-1980s when heavy cyanobacterial blooms were eliminated by the nontraditional biomanipulation (massive stocking of the filter-feeding silver and bighead carps), but also explains why TP in European lakes decreased remarkably in the spring clear-water phase with less phytoplankton during the seasonal succession of aquatic communities or when phytoplankton biomass was decreased

关键词： shallow lakes, internal P loading, algal blooms.

A Low-Complexity Key-Recovery Attack on 6-Round Midori64

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Journal of Systems Science & Complexity 2023年第4期36卷 1738-1756页

作者： xie Xiaofeng TIAN Tian Information Engineering University Zhengzhou 450001China

In EUROCRYPT 2017,a new structure-difference property,say“a-multiple-of-8”was proposed on 5-round *** by the idea,yoyo attacks and mixture differential attacks were proposed yielding new records on data and computational complexities for key-recovery attacks against 5-round *** this paper,the authors attempt to apply the idea of mixture differential cryptanalysis to *** is a lightweight block cipher proposed at ASIACRYPT *** the structure of Midori is similar to AES,the MixColumn matrix of Midori is not *** on this observation,the authors present a class of deterministic differential trails on 2-round *** combined with the yoyo trick,a new type of 4-round retracing boomerang distinguishers is obtained on *** on the new 4-round distinguishers,a key-recovery attack on 6-round Midori64 is given that requires only 2^(27)computational complexity,2^(29)chosen plaintexts,2^(20)adaptively chosen *** key-recovery attack has been experimentally verified.

关键词： Boomerang attack Midori mixture differential attack yoyo attack