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Polygonal finite element-based content-aware image warping

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Computational Visual Media 2023年第2期9卷 367-383页

作者： Juan Cao xiaoyi zhang Jiannan Huang Yongjie Jessica zhang School of Mathematical Sciences Xiamen UniversityXiamen 361005China Fujian Provincial Key Laboratory of Mathematical Modeling and High-Performance Scientific Computation Xiamen UniversityXiamen 361005China Department of Mechanical Engineering Carnegie Mellon UniversityPittsburghPA 15213USA

Mesh-based image warping techniques typically represent image deformation using linear functions on triangular meshes or bilinear functions on rectangular *** enables simple and efficient implementation,but in turn,restricts the representation capability of the deformation,often leading to unsatisfactory warping *** present a novel,flexible polygonal finite element(poly-FEM)method for content-aware image *** deformation is represented by high-order poly-FEMs on a content-aware polygonal mesh with a cell distribution adapted to saliency information in the source *** allows highly adaptive meshes and smoother warping with fewer degrees of freedom,thus significantly extending the flexibility and capability of the warping *** from the continuous formulation of image deformation,our polyFEM warping method is able to compute the optimal image deformation by minimizing existing or even newly designed warping energies consisting of penalty terms for specific *** demonstrate the versatility of the proposed poly-FEM warping method in representing different deformations and its superiority by comparing it to other existing state-ofthe-art methods.

关键词： image warping finite element method(FEM) polygonal element mesh generation

Stability of solutions for nonlinear Schrdinger equations in critical spaces

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Science China Mathematics 2011年第5期54卷 973-986页

作者： LI Dong zhang xiaoyi Department of Mathematics University of Iowa Iowa city IA 52242 USA Academy of Mathematics and Systems Science Chinese Academy of Sciences Beijing 100190 China

We consider the Cauchy problem for nonlinear Schrdinger equation iut + Δu = ±|u|pu,4/d< p <4 /d-2 in high dimensions d 6. We prove the stability of solutions in the critical space H˙xsp , where sp = d/2-p/2 .

关键词： Schrodinger equation stability critical space

Energy flexibility and resilience analysis of demand-side energy efficiency measures within existing residential houses during cold wave event

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Building Simulation 2024年第7期17卷 1043-1063页

作者： xiaoyi zhang Fu Xiao Yanxue Li Yi Ran Weijun Gao Innovation Institute for Sustainable Maritime Architecture Research and Technology Qingdao University of TechnologyQingdaoChina Department of Building Environment and Energy Engineering The Hong Kong Polytechnic UniversityHong KongChina Faculty of Environmental Engineering The Universityof KitakyushuKitakyushuJapan

Using the behind-meter data,this study applied a comparison and optimization-based framework to evaluate the energy flexibility and resilience of distributed energy resources within existing houses during cold wave *** analysis demonstrates the effectiveness of high envelope insulation level in improving energy resilience,identifies impacts of distributed energy resources on variations of household electricity ***,a 14.6%reduction in the median value of the normalized load of building group with low U-values,implementations of cogeneration system effectively suppressed variations of electricity *** energy performances of on-site generators are evaluated based on high resolution data,energy flexibility of domestic hot water and thermostatically controlled loads were investigated through built demand response *** reveal that electrifying hot water demand offers additional power flexibility,the integration of fuel cell cogeneration system has proven to be an efficient energy resource,enabling on-site generation of both electricity and hot water,substantially reducing grid *** extreme cold event resulted in significant spikes in space heating power *** optimization results demonstrate that reducing the indoor setpoint temperature effectively decreases daily power consumption by approximately 5.0%per degree *** findings help acquire better understanding of interconnections between energy efficiency and resilience of residential energy-efficient measures.

关键词： system modeling energy efficiency energy resilience cold wave thermal comfort

Modeling and management performances of distributed energy resource for demand flexibility in Japanese zero energy house

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Building Simulation 2023年第11期16卷 2177-2192页

作者： Yanxue Li xiaoyi zhang Fu Xiao Weijun Gao Yan Liu Innovation Institute for Sustainable Maritime Architecture Research and Technology Qingdao University of TechnologyQingdao266033China Department of Building Environment and Energy Engineering The Hong Kong Polytechnic UniversityHong KongChina Faculty of Environmental Engineering The University of KitakyushuKitakyushu808-0135Japan

Zero-energy buildings(ZEBs)can contribute to decarbonizing building energy systems,while the energy mismatch between energy demand and on-site stochastic generation in ZEBs increases the need for energy *** study proposed mixed-integer linear programming energy management schemes for optimizing the flexible scheduling of distributed energy resources,including battery energy storage,heat pump,and building thermal mass as a passive thermal energy storage *** optimally designed objectives,this study used case studies to evaluate the flexibility potential provided by the demand-side management,considering dynamic characteristics of the *** results showed that the proposed demand-side management for battery storage offers significant potential in increasing photovoltaic(PV)self-consumption and reducing operational *** reduction ratios of flexible dispatch of combined PV and battery storage systems exceed 15%.Flexible coupling of PV and heat pump systems for meeting hot water demand can reduce energy cost by more than 20%.The flexible coupling of the heat pump and PV system also had a significant impact on the power consumption pattern of domestic heat pumps,the load-shifting potential highly depends on the available PV generation and hot water *** optimal trade-off between thermal energy use and thermal comfort violation may not reduce the total energy used for space heating,the increased PV consumption helped reduce grid *** study provides insights into the energy flexibility behavior and efficiency of the proposed demand-side management for ZEBs,which is expected to provide guidelines for exploring demand-side flexibility.

关键词： energy flexibility zero-energy building distributed energy resources energy system management

Study on the challenge and influence of the built thermal environment on elderly health in rural areas:Evidence from Shandong,China

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Building Simulation 2023年第8期16卷 1345-1360页

作者： Yanxue Li Yue Gu Zhihui Li xiaoyi zhang Weijun Gao Fu Xiao Innovation Institute for Sustainable Maritime Architecture Research and Technology Qingdao University of TechnologyFushun Road 11Qingdao 266033China Department of Building Environment and Energy Engineering The Hong Kong Polytechnic UniversityHong KongChina Qingdao Women and Children’s Hospital Tongfu Road 6Qingdao 266000China Faculty of Environmental Engineering The University of KitakyushuKitakyushu808-0135Japan

Elderly health is increasingly recognized as a worldwide challenge with the continuous social aging *** study aimed to investigate the thermal conditions of the elderly in rural areas of Shandong,*** thermal sensation and physiological response performances of elderly participants were examined in their own *** show a clear seasonal pattern in cardiovascular disease mortality,cold stress increases the cardiovascular disease *** coal-based stoves serve as the main source of home heating and their limited coverage of the room area gave rise to poor quality of thermal *** analysis of skin temperature for those under 65 and above did not reveal any significant difference in response to different indoor *** regression results confirm that a colder home leads to a rising value of the elderly’s systolic blood pressure,rising by more than 1 mmHg for every 1℃decrease in indoor temperature and thus posing a greater risk of cardiovascular *** systolic blood pressure value of older subjects rise more when they are exposed to decreasing indoor temperatures,possibly due to an age-related decline in their ability to maintain stability of blood *** is noteworthy that the average blood velocity of older subjects reduces less in response to decreasing indoor temperatures,indicating a weakened capacity to resist cold stress and its associated high risk of *** investigation provides evidence in favor of improving the thermal environment of the elderly and reducing their risk of cardiovascular diseases.

关键词： rural house thermal environment cardiovascular diseases physiological parameters elderly

Pharmacophore and Docking-based 3D-QSAR Studies on HIV-1 Integrase Inhibitors

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Chemical Research in Chinese Universities 2014年第2期30卷 297-305页

作者： zhang xiaoyi DENG Dongjie TAN Jianjun HE Yu LI Chunhua WANG Cunxin College of Life Science and Bioengineering Beijing University of Technology Beijing 100124 P.R.China College of Materials Science and Engineering Beijing University of Technology Beijing 100124 P.R.China

Integrase（IN） plays an essential role in the process of HIV-1 *** inhibitors of diketo acid derivatives（DKAs） were analysed by the Comparative Molecular Field Analysis（CoMFA） and Comparative Molecular Similarity Induces Analysis（CoMSIA） methods.A set of 42 compounds were randomly selected as the training set（35） and test set（7）.Firstly,a good pharmacophore（goodness of hit=0.787） was obtained and used to align ***,predictive models were constructed with the CoMFA and CoMSIA methods based on the pharmacophore *** a result,the CoMS1A method yielded the best model with an r2 of 0.955 and a q2 of 0.665,which can predict the activities of the tested DKAs very well（r2=0.559）.Finally,DKAs were docked into IN,and the predicit modes were superimposed on the contour maps obtained from the best CoMSIA *** superimposed maps gave a visualized and meaningful insight into the inhibitory behaviors,providing significantly useful information for the rational drug design of anti-IN agents.

关键词： HIV-1 integrase Diketo acid Quantitative structure-activity relationship Pharmacophore Molecular docking

A Strategy to Find Novel Candidate DKAs Inhibitors Using Modified QSAR Model with Favorable Druggability Properties

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Chemical Research in Chinese Universities 2019年第6期35卷 1111-1118页

作者： zhang xiaoyi NIU Wenling TANG Tang HOU Chengfei GUO Yajie KONG Ren College of Life Science and Bioengineering Beijing University of TechnologyBeijing 100124P.R.China Institute of Bioinfotmatics and Medical Engineering School of Electrical and Information EngineeringJiangsu University of TechnologyChangzhou 213016P.R.China

The study dealed with quantitative structure-activity relationship(QSAR)to explore the important features of diketo acid(DKA)derivatives for exerting potent HIV-1 integrase inhibitors activity.A three-step screening method was proposed to choose ***,additional descriptors were used in the CoMFA and ***,a modified CoMSIA m7 model,constructed by adding Csp^2_03_F descriptor,showed better predictive *** parameters(Q^2 and R^2)for the models were 0.722 and 0.925,*** addition,external validation for the models using a test group revealed R^2pred=*** maps analysis defined favored and disfavored regions of the compounds,and two new compounds with the descriptor structure were designed with better activities than Raltegravir(RAL),well drug-likeness and low *** research provides a base for further DKA development.

关键词： Diketo acid(DKA) Modified quantitative structure-activity relationship(QSAR) Autodock Drug design Descriptor screening

Field Investigation and Comparison Analysis of Low-Grade Heat Pump Technologies in Building Space Heating Projects

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Energy Engineering 2022年第1期119卷 63-81页

作者： Yanxue Li Weijun Gao xiaoyi zhang Wenya Xu Yingjun Ruan Yinzhong Wang Innovation Institute for Sustainable Maritime Architecture Research and Technology Qingdao University of TechnologyQingdao266033China Faculty of Environmental Engineering The University of KitakyushuKitakyushu808-0135Japan Institute of Mechanical Engineering Tongji UniversityShanghai200092China Dongying Electric Power Company Dongying257000China

The building sector contributes a large ratio of final energy consumption,and improving building energy efficiency is expected to play a significant role in mitigating its carbon dioxide ***,we collected the on-site measurement data to investigate the techno-economic performances of different heat pump types that exist in building space heating projects in Qingdao,*** in-depth analysis revealed the temperature variations of measured low-grade heat sources over the whole heating supply period,and urban sewage water shows high stable heat energy quality compared with seawater and geothermal heat *** behaviors including cycling inlet and outlet temperature of the selected heat pumps were illustrated,and analysis evaluated detailed effects of operational parameters on energy efficiency *** the relationship between COPs distributions of heat pumps and operational conditions was examined further,and the positive effect of the rising temperature of heat sources on energy efficiency improvement of heat pump is highlighted when the heating supply temperature is ***,we analyzed the economic and carbon emission performance of the heat pump system,and results show that electricity price plays a vital role in the lifespan energy cost saving potential,and the heat pump could serve as a promising approach in reducing CO_(2) related to the building space ***,we recommended suggestions for improving the overall energy efficiency and cost competitiveness of decentralized heat pump systems for building space heating.

关键词： On-site measurement heat pumps heating supply operational performance

Q learning algorithm based UAV path learning and obstacle avoidence approach 36

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Q learning algorithm based UAV path learning and obstacle av...