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Measuring the spatiotemporal variation and evolution of transport network of China＇s megaregions

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Journal of Geographical Sciences 2016年第10期26卷 1497-1516页

作者： SONG Ge YANG Jiawen School of management University of Science and Technology of China Hefei 230026 China School of Urban planning and Design Peking University Shenzhen Graduate School Shenzhen 518055 Guangdong China

Megaregion has become a prominent feature of modern China. Reflecting upon China＇s recent path of transport infrastructure construction, this research examines the spatiotemporal characteristics of transport network development and its accessibility impacts in China＇s ten megaregions from 1982 to 2010. Using historical transport network data and multiple national censuses （1982, 1990, 2000 and 2010）, we computed two levels of indicators of megaregional transport network： megaregion level and county level, and analyzed the intra-megaregion and inter-megaregion disparities of transport network of the ten megaregions of China. Transport networks at the megaregion level are measured by three indicators： 1） transport network density; 2） infrastructure endowment per capita; and 3） size of transport network＇s standard ellipse. Two accessibility indicators for measuring transportation network at the county level are calculated： weighted average travel time and potential accessibility. The research results show the following： 1） Road and rail network densities witnessed the greatest growth during the 2000-2010 period, and growth was more significant for railway network. 2） By 2010, average road endowments per capita in inland megaregions became higher than in coastal megaregions, while average rail endowments per capita in coastal megaregions became higher than in inland megaregions. 3） The sizes and directions of the standard deviational ellipses of road and rail network changed continuously during the study period. However the changes of road network ellipses were relatively small, while the changes of railway network ellipses were more significant. 4） Megaregions have all benefited significantly from transportation infrastructure improvement in the past few decades in terms of WATT and potential accessibility, but the three giant megaregions benefited most.

关键词： China megaregions transport network accessibility GIS transport network model

Machine learning accelerated carbon neutrality research using big data-from predictive models to interatomic potentials

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Science China(Technological Sciences) 2022年第10期65卷 2274-2296页

作者： WU LingJun XU ZhenMing WANG ZiXuan CHEN ZiJian HUANG ZhiChao PENG Chao PEI XiangDong LI XiangGuo MAILOA Jonathan P HSIEH Chang-Yu WU Tao YU Xue-Feng ZHAO HaiTao Materials Interfaces center Shenzhen Institute of Advanced TechnologyChinese Academy of SciencesShenzhen 518055China College of Materials Science and Technology Nanjing University of Aeronautics and AstronauticsNanjing 210016China Multiscale Crystal Materials Research center Shenzhen Institute of Advanced TechnologyChinese Academy of SciencesShenzhen 518055China College of Computer National University of Defense TechnologyChangsha 410073China School of Materials Shenzhen Campus of Sun Yat-sen UniversityShenzhen 518107China Quantum Laboratory TencentShenzhen 518057China China Beacons Institute The University of Nottingham Ningbo ChinaNingbo 315100China

Carbon neutrality has been proposed as a solution for the current severe energy and climate crisis caused by the overuse of fossil fuels, and machine learning(ML) has exhibited excellent performance in accelerating related research owing to its powerful capacity for big data processing. This review presents a detailed overview of ML accelerated carbon neutrality research with a focus on energy management, screening of novel energy materials, and ML interatomic potentials(MLIPs), with illustrations of two selected MLIP algorithms: moment tensor potential(MTP) and neural equivariant interatomic potential(NequIP). We conclude by outlining the important role of ML in accelerating the achievement of carbon neutrality from global-scale energy management, unprecedented screening of advanced energy materials in massive chemical space, to the revolution of atomicscale simulations of MLIPs, which has the bright prospect of applications.

关键词： carbon neutrality machine learning big data molecular dynamics interatomic potentials

DRIVING FACTORS FOR CONSTRUCTION WASTE MINIMIZATION:EMPIRICAL STUDIES IN HONG KONG AND shenzhen

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Journal of Green Building 2019年第4期14卷 155-167页

作者： Zezhou Wu Ann T.W.Yu Hao Wang Yigang Wei Xiaosen Huo Sino-Australia Joint Research center in BIM and Smart Construction Shenzhen UniversityShenzhenChina Department of Building and Real Estate The Hong Kong Polytechnic UniversityKowloonHong Kong School of management Science and Engineering Central University of Finance and EconomicsBeijingChina School of Economics and management Beihang UniversityBeijingChina School of Economics and management Chongqing Jiaotong UniversityChongqingChina

Effective waste management is an important aspect of green building ***,a number of studies find that construction waste minimization actions are not satisfactorily performed in ***,it is of significance to identify the driving factors that influence construction practitioners’waste minimization *** paper aims to explore the driving factors by comparing the affecting factors and construction waste minimization behavior between Hong Kong and ***,through a comprehensive literature review,potential affecting factors were categorized into five groups:background information variables,construction waste minimization intentions,economic viability,governmental supervision,and project *** on the identified factors,a questionnaire was initially designed and then refined through a focus group meeting with three experienced experts.A total of 166 questionnaires were collected and non-parametric tests(Mann-Whitney U Test and Kruskal-Wallis Test)were conducted to investigate the underlying driving *** revealed that background information variables play insignificant roles in construction waste *** with other affecting factors(i.e.,waste minimization intentions,governmental supervision,project constraints),economic viability is the most important driving factor that determines construction waste *** suggested that local governments should make policies that increase practitioners’profit,rather than just increasing their intentions or regulating waste management behavior.

关键词： driving factor construction waste minimization economic viability Hong Kong shenzhen

China's current forest age structure will lead to weakened carbon sinks in the near future

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The Innovation 2023年第6期4卷 38-47页

作者： Rong Shang Jing M.Chen Mingzhu Xu Xudong Lin Peng Li Guirui Yu Nianpeng He Li Xu Peng Gong Liangyun Liu Han Liu Wenzhe Jiao Key Laboratory for Humid Subtropical Eco-Geogr aphical Processes of the Ministy of Education School of Geographical SciencesFujian Normal UniversityFuzhou 350117China Department of Geography and planning University of TorontoTorontoOntario M5S 3G3Canada Key Laboratory of Ecosystem Network Observation and Modeling Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBejing 100101China Institute for Climate and Carbon Neutrality Department of Geography and Department of Earth SciencesUniversity of Hong KongHong Kong 999077China International Research center of Big data for Sustainable Development Goals Beijing 100094China Land Consolidation and Rehabilitation center Ministry of Natural ResourcesBeijing 100035China Department of Civil and Environmental Engineering Massachusetts Institute of TechnologyCambridgeMA 02139USA

Forests are chiefly responsible for the terrestrial carbon sink that greatly re duces the buildup of CO_(2)concentrations in the atmosphere and alleviates climate *** predictions of terrestrial carbon sinks in the future have so far ignored the variation of forest carbon uptake with forest ***,we predict the role of China's current forest age in future carbon sink capacity by generating a high-resolution(30 m)forest age map in 2019 over China's landmass using satellite and forest inventory data and deriving forest growth curves using measurements of forest biomass and age in 3,121 *** China's forests currently have large proportions of young and middle-age stands,we project that China's forests will maintain high growth rates for about 15 ***,as the forests grow older,their net primary productivity will decline by 5.0%±1.4%in 2050,8.4%±1.6%in 2060,and 16.6%±2.8%in 2100,indicating weakened carbon sinks in the near *** weakening of forest carbon sinks can be potentially mitigated by optimizing forest age structure through selective logging and implementing new or improved *** finding is important not only for the global carbon cycle and climate projections but also for developing forest management strategies to enhance land sinks by alleviating the age effect.

关键词： forest carbon structure

An Easily Compatible Eye-tracking System for Freely-moving Small Animals

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Neuroscience Bulletin 2022年第6期38卷 661-676页

作者： Kang Huang Qin Yang Yaning Han Yulin Zhang Zhiyi Wang Liping Wang Pengfei Wei shenzhen Key Lab of Neuropsychiatric Modulation and Collaborative Innovation center for Brain Science Guang-dong Provincial Key Laboratory of Brain Connectome and BehaviorCAS Center for Excellence in Brain Science and Intelligence TechnologyBrain Cognition and Brain Disease InstituteShenzhen-Hong Kong Institute of Brain Science-Shenzhen Fundamental Research InstitutionsShenzhen Institute of Advanced TechnologyChinese Academy of SciencesShenzhen 518055China University of Chinese Academy of Seiences Bejing 100049China Harbin Institute of Technology shenzhen Shenzhen 518055.China

Measuring eye movement is a fundamental approach in cognitive science as it provides a variety of insightful parameters that reflect brain states such as visual attention and *** eye-tracking with multimodal neural recordings or manipulation techniques is beneficial for understanding the neural substrates of cognitive *** commercially-available and custom-built systems have been widely applied to awake,head-fixed small ***,the existing eyetracking systems used in freely-moving animals are still limited in terms of their compatibility with other devices and of the algorithm used to detect eye ***,we report a novel system that integrates a general-purpose,easily compatible eye-tracking hardware with a robust eye feature-detection *** ultra-light hardware and a detachable design,the system allows for more implants to be added to the animal's exposed head and has a precise synchronization module to coordinate with other neural ***,we systematically compared the performance of existing commonly-used pupil-detection approaches,and demonstrated that the proposed adaptive pupil feature-detection algorithm allows the analysis of more complex and dynamic eye-tracking data in freemoving *** eye-tracking and electroencephalogram recordings,as well as algorithm validation under five noise conditions,suggested that our system is flexibly adaptable and can be combined with a wide range of neural manipulation and recording technologies.

关键词： Eye-tracking Freely-moving Head-mounted device Pupil detection Adaptive Kalman filter

A Social Network Analysis on Organizational Innovation and Its Effects: A Case Study on the Practice of Changzhou Municipal Bureau of Urban planning,Xinbei Branch

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China City planning Review 2017年第4期26卷 57-64页

作者： Li Dongquan Lan Zhiyong Wei Dengyu Qian Fang Liu Jian Department of Urban planning and management School of Public Administration and PolicyRenmin University of China Research center of Urban-Rural Development planning and management Renmin University of China School of Public management and Policy Tsinghua University Everbright Xinglong Trust Co. Ltd. 不详

Using Xinbei Branch of Changzhou Municipal Bureau of Urban planning as a case,this study carefully examines how organizations innovate in China's urban planning *** study builds itself upon a network analysis of the data collected through a survey of all the relevant members about their working relationships after their organizational *** shows that,with regional competition for economic development,the local government departments in developed areas tend to actively seek opportunities for organizational innovation in order to ensure planning management effectiveness and promote planning implementation *** reform measures and their effects are carefully examined for identifying lessons and experiences in planning implementation in China.

关键词： Social Network Analysis planning management organizational innovation Xinbei Branch Bureau

Simulation modeling and optimization for ambulance allocation considering spatiotemporal stochastic demand

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Journal of management Science and Engineering 2019年第4期4卷 252-265页

作者： Wei Yang Qiang Su Samuel HHuang Qiugen Wang Yanhong Zhu Ming Zhou College of management Shenzhen University518060ShenzhenChina School of Economics and management Tongji University200092ShanghaiChina Department of Mechanical and Materials Engineering University of CincinnatiCincinnatiOH45221USA Trauma center Shanghai General Hospital200127ShanghaiChina

To ensure a timely response to emergencies,governments are obliged to implement effective ambulance allocation *** practice,an emergency medical service(EMS)system works in an uncertain environment,with stochastic demand,response-times,and *** uncertainty significantly affects ambulance allocation ***-ever,few studies in this field adequately consider the effect of spatiotemporal uncertainty in demand,because it is difficult to measure it *** a result,few analytic models capture the dynamic nature of an EMS system and,thus,the allocation plans they generate are not efficient in ***,this study proposes a simulation-based optimization method for ambulance allocation.A simulation model is constructed to mimic the operational processes of an EMS system,and to evaluate the performance of an ambulance allocation plan in an uncertain *** mixture model clus-tering is used to derive the uncertain spatial ***,the simulation generates emergency demand based on the obtained spatial distribution.A Gaussian-process-based search algorithm is used together with the simulation model to identify optimal *** validate the proposed method,a case study is conducted using data on emergency patients in the Shanghai Songjiang *** with the current plan adopted in Songjiang,the experimental results demonstrate that the delay time and frequency of the EMS system can be reduced significantly by employing the proposed ***-more,nearly 41%of the allocation cost can be saved.

关键词： Ambulance allocation Spatiotemporal randomness Simulation-based optimization Gaussian process

BIdM:A Blockchain-Enabled Cross-Domain Identity management System

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Journal of Communications and Information Networks 2021年第1期6卷 44-58页

作者： Ruibiao Chen Fangxing Shu Shuokang Huang Lei Huang Huafang Liu Jin Liu Kai Lei ICNLab School of Electronic and Computer EngineeringPeking UniversityShenzhen 518000China PCL Research center of Networks and Communications Peng Cheng LaboratoryShenzhen 518000China

Reliable identity management and authentication are significant for network *** recent years,as traditional centralized identity management systems suffer from security and scalability problems,decentralized identity management has received considerable attention in academia and ***,with the increasing sharing interaction among each domain,management and authentication of decentralized identity has raised higher requirements for cross-domain trust and faced implementation challenges *** solve these problems,we propose BIdM,a decentralized crossdomain identity management system based on *** design a decentralized identifier(DID)for naming identities based on the consortium blockchain *** the identity subject fully controls the life cycle and ownership of the proposed DID,it can be signed and issued without a central authentication node’s ***,every node in the system can participate in identity authentication and trust establishment,thereby solving the centralized mechanism’s single point of failure *** further improve authentication efficiency and protect users’privacy,BIdM introduces a one-way accumulator as an identity data structure,which guarantees the validity of entity *** theoretically analyze the feasibility and performance of BIdM and conduct evaluations on a prototype *** experimental results demonstrate that BIdM achieves excellent optimization on cross-domain authentication compared with existing identity management systems.

关键词： decentralized identifier blockchain oneway accumulator cross-domain authentication identity management

A novel deep generative modeling-based data augmentation strategy for improving short-term building energy predictions

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Building Simulation 2022年第2期15卷 197-211页

作者： Cheng Fan Meiling Chen Rui Tang Jiayuan Wang Key Laboratory for Resilient Infrastructures of Coastal Cities(shenzhen University) Ministry of EducationChina Sino-Australia Joint Research center in BIM and Smart Construction Shenzhen UniversityShenzhenChina Building Technology&Urban Systems Division Lawrence Berkeley National LaboratoryUSA

Short-term building energy predictions serve as one of the fundamental tasks in building operation *** large numbers of studies have explored the value of various supervised machine learning techniques in energy predictions,few studies have addressed the potential data shortage problem in developing data-driven *** promising solution is data augmentation,which aims to enrich existing building data resources for reliable predictive *** study proposes a deep generative modeling-based data augmentation strategy for improving short-term building energy *** types of conditional variational autoencoders have been designed for synthetic energy data generation using fully connected and one-dimensional convolutional layers *** experiments have been designed to evaluate the value of data augmentation using actual measurements from 52 *** results indicate that conditional variational autoencoders are capable of generating high-quality synthetic data samples,which in turns helps to enhance the accuracy in short-term building energy *** average performance enhancement ratios in terms of CV-RMSE range between 12%and 18%.Practical guidelines have been obtained to ensure the validity and quality of synthetic building energy *** research outcomes are valuable for enhancing the robustness and reliability of data-driven models for smart building operation management.

关键词： building energy predictions data augmentation data-driven models generative modeling variational autoencoders