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Social influence and spread dynamics in social networks

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Frontiers of Computer Science 2012年第5期6卷 611-620页

作者： xiaolong zheng Yongguang ZHONG Daniel ZENG Fei-Yue WANG State Key Laboratory of Management and Control for Complex Systems Institute of AutomationChinese Academy of SciencesBeijing 100190China Department of Management Science and Engineering Qingdao UniversityQingdao 266071China

Social networks often serve as a critical medium for information dissemination, diffusion of epidemics, and spread of behavior, by shared activities or similarities be- tween individuals. Recently, we have witnessed an explosion of interest in studying social influence and spread dynamics in social networks. To date, relatively little material has been provided on a comprehensive review in this field. This brief survey addresses this issue. We present the current significant empirical studies on real social systems, including network construction methods, measures of network, and newly em- pirical results. We then provide a concise description of some related social models from both macro- and micro-level per- spectives. Due to the difficulties in combining real data and simulation data for verifying and validating real social sys- tems, we further emphasize the current research results of computational experiments. We hope this paper can provide researchers significant insights into better understanding the characteristics of personal influence and spread patterns in large-scale social systems.

关键词： social networks spread dynamics social influence computational experiment

Astrocyte transplantation for repairing the injured spinal cord

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The Journal of Biomedical Research 2022年第5期36卷 312-320页

作者： xiaolong zheng Wei Wang Department of Neurology Tongji HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhanHubei 430030China Key Laboratory of Neurological Diseases of Chinese Ministry of Education the School of Basic MedicineTongji Medical CollegeHuazhong University of Science and TechnologyWuhanHubei 430030China

Spinal cord injury(SCI)leads to permanent deficits in neural function without effective therapies,which places a substantial burden on families and ***,the major glia supporting the normal function of neurons in the spinal cord,become active and form glial scars after SCI,which has long been regarded as a barrier for axon ***,recent progress has indicated the beneficial role of astrocytes in spinal *** the past three decades,astrocyte transplantation for SCI treatment has gained increasing *** this review,we first summarize the progress of using rodent astrocytes as the primary step for spinal *** astrocytes can survive well,migrate extensively,and mature in spinal injury;they can also inhibit host reactive glial scar formation,stimulate host axon regeneration,and promote motor,sensory,respiratory,and autonomic functional ***,we review the progress in spinal repair by using human astrocytes of various origins,including the fetal brain,fetal spinal cord,and pluripotent stem ***,we introduce some key questions that merit further research in the future,including rapid generation of large amounts of human astrocytes with high purity,identification of the right origins of astrocytes to maximize neural function improvement while minimizing side effects,testing human astrocyte transplantation in chronic SCI,and verification of the long-term efficacy and safety in large animal models.

关键词： spinal cord injury astrocyte transplantation regeneration

A Hybrid Estimation of Distribution Algorithm for Unrelated Parallel Machine Scheduling with Sequence-Dependent Setup Times

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IEEE/CAA Journal of Automatica Sinica 2016年第3期3卷 235-246,246+236-245页

作者： Ling Wang Shengyao Wang xiaolong zheng Department of Automation Tsinghua University

A hybrid estimation of distribution algorithm (EDA) with iterated greedy (IG) search (EDA-IG) is proposed for solving the unrelated parallel machine scheduling problem with sequence-dependent setup times (UPMSP-SDST). For makespan criterion, some properties about neighborhood search operators to avoid invalid search are derived. A probability model based on neighbor relations of jobs is built in the EDA-based exploration phase to generate new solutions by sampling the promising search region. Two types of deconstruction and reconstruction as well as an IG search are designed in the IG-based exploitation phase. Computational complexity of the algorithm is analyzed, and the effect of parameters is investigated by using the Taguchi method of design-of-experiment. Numerical tests on 1640 benchmark instances are carried out. The results and comparisons demonstrate the effectiveness of the EDA-IG. Especially, the bestknown solutions of 531 instances are updated. In addition, the effectiveness of the properties is also demonstrated by numerical comparisons. © 2014 Chinese Association of Automation.

关键词： Benchmarking Computational complexity Design of experiments Machinery Optimization Scheduling Taguchi methods

An epidemiological analysis of the Beijing 2008 Hand-Foot-Mouth epidemic

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Chinese Science Bulletin 2010年第12期55卷 1142-1149页

作者： CAO ZhiDong ZENG DaJun WANG QuanYi zheng xiaolong WANG FeiYue Key Laboratory of Complex Systems and Intelligence Science Institute of Automation Chinese Academy of Sciences Beijing 100190 China Beijing Center for Disease Control and Prevention Beijing 100013 China

This paper presents an empirical analysis of the epidemiological data concerning the 18445 HFMD-infected cases in Beijing in *** main findings are as follows.(i) Seasonal variations in incidence were observed,with a peak observed during the summer season,especially in *** patients outnumber female patients by 1.57:1.(ii) Most cases occurred in children 4 years old or *** Weibull distribution and Gamma distribution as to model fitness when analyzing patient ages,log-normal distribution indicates that the estimated mean age is 3.4 years.(iii) The age distribution seems to indicate cyclic peaks with roughly one-year intervals.(iv) Correlation analyses (ρ=0.9864) show that time of birth in different months has an impact on the chance of being infected by *** month seems to present a high risk factor on infants and young children.(v) The morbidity rate is 132.7/100000 during the HFMD epidemic in Beijing in *** morbidity map shows that the risks of HFMD infection in areas close to the city center and suburbans are much lower than those in the urban-rural transition *** risks inferred from the morbidity map demonstrate a clear circular pattern.(vi) The prevention and control measures taken by the public health departments seem to be effective during the summer season,resulting in the early ending of the epidemic (one month earlier than the natural season) and reduced outbreak size.

关键词：流行病学分析疫情北京 Weibull分布模型作者对数正态分布季节变化平均年龄

Spatio-temporal evolution of Beijing 2003 SARS epidemic

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Science China Earth Sciences 2010年第7期53卷 1017-1028页

作者： CAO ZhiDong ZENG DaJun zheng xiaolong WANG QuanYi WANG FeiYue WANG JinFeng WANG XiaoLi Key Laboratory of Complex Systems and Intelligence Science Institute of AutomationChinese Academy of SciencesBeijing 100190China Beijing Center for Disease Control and Prevention Beijing 100013China State Key Laboratory of Resources and Environmental Information System Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101China

Studying spatio-temporal evolution of epidemics can uncover important aspects of interaction among people, infectious diseases, and the environment, providing useful insights and modeling support to facilitate public health response and possibly prevention measures. This paper presents an empirical spatio-temporal analysis of epidemiological data concerning 2321 SARS-infected patients in Beijing in 2003. We mapped the SARS morbidity data with the spatial data resolution at the level of street and township. Two smoothing methods, Bayesian adjustment and spatial smoothing, were applied to identify the spatial risks and spatial transmission trends. Furthermore, we explored various spatial patterns and spatio-temporal evolution of Beijing 2003 SARS epidemic using spatial statistics such as Moran’s I and LISA. Part of this study is targeted at evaluating the effectiveness of public health control measures implemented during the SARS epidemic. The main findings are as follows. (1) The diffusion speed of SARS in the northwest-southeast direction is weaker than that in northeast-southwest direction. (2) SARS’s spread risk is positively spatially associated and the strength of this spatial association has experienced changes from weak to strong and then back to weak during the lifetime of the Beijing SARS epidemic. (3) Two spatial clusters of disease cases are identified: one in the city center and the other in the eastern suburban area. These two clusters followed different evolutionary paths but interacted with each other as well. (4) Although the government missed the opportunity to contain the early outbreak of SARS in March 2003, the response strategies implemented after the mid of April were effective. These response measures not only controlled the growth of the disease cases, but also mitigated the spatial diffusion.

关键词： severe acute respiratory syndrome (SARS) Beijing morbidity rate spatial analysis spatio-temporal evolution control measures

Platform governance in the era of AI and the digital economy

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Frontiers of Engineering Management 2023年第1期10卷 177-182页

作者： xiaolong zheng Gang ZHOU Daniel Dajun ZENG The State Key Laboratory of Management and Control for Complex Systems Institute of AutomationChinese Academy of SciencesBeijing 100190China School of Artificial Intelligence Chinese Academy of SciencesBeijing 100190China

1 Introduction Companies that supply online services such as Twitter,Weibo,and Taobao are known as platform companies(Gorwa,2019).Many top companies offer their services through platforms and use Internet technology to facilitate economic transactions,transmit information,connect people,and make predictions(Fenwick et al.,2019).Such platforms cover all areas of society,including politics(Gillespie,2017),labor relations,cultural production(Scholz,2016;van Doorn,2017),and consumption(Nieborg and Poell,2018).The rapid development of Internet technology has increased the influence of network *** platforms have changed the rules of global business operations and influenced the global political *** some high-profile negative events,calls for strengthening the regulation of online platforms and holding them accountable have been growing(Suzor,2019).

关键词： companies services operations

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2.4GHz无线网络共存技术研究进展

计算机研究与发展 2016年第1期53卷 26-37页

作者：何源郑霄龙清华大学软件学院北京100084 清华信息科学与技术国家实验室(筹) 北京100084

信息时代的众多网络应用需求孕育了多种多样的无线网络通信协议,蓬勃发展的物联网将众多无线网络协议纳入了一个共同的网络框架内.随着物联网系统的广泛应用,同一区域内,尤其在室内环境中,多种无线网络协议共存的情况越来越普遍.众多共... 详细信息

信息时代的众多网络应用需求孕育了多种多样的无线网络通信协议,蓬勃发展的物联网将众多无线网络协议纳入了一个共同的网络框架内.随着物联网系统的广泛应用,同一区域内,尤其在室内环境中,多种无线网络协议共存的情况越来越普遍.众多共存的无线网络协议不仅不能彼此分享数据信息,反而会对彼此造成干扰,影响通信效率.因此,无线网络协议共存技术近年来成为了工业界和学术界的研究热点.然而现在关于2.4GHz频段上的无线网络共存的综述研究或仅仅针对某2种协议间的共存,或缺少对最新技术的总结.因此,在重新梳理相关研究的基础上,介绍了共存问题的成因,分析了共存问题的影响,按照共存环境复杂性,回顾了现有工作提出的关键共存技术,包括同质干扰的避让、容忍和并发传输,异质干扰的检测、识别和异质干扰环境下的共存传输.最后,展望了物联网发展大环境下共存技术的发展趋势——更广泛的互联互通.

关键词： 2.4GHz 无线协议共存异质干扰研究综述

Crowdsourcing intelligence for improving disaster forecasts

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The Innovation 2024年第4期5卷 13-14页

作者： Xiaohui Wang Fuhai Dao Yatai Ji Sihang Qiu Xian Zhu Wenjie Dong Huizan Wang Weimin Zhang xiaolong zheng College of Meteorology and Oceanography National University of Defense TechnologyChangsha 410073China School of Atmospheric Science Sun Yat-sen UniversityZhuhai 519082China College of Systems Engineering National University of Defense TechnologyChangsha 410073China The School of Artificial Intelligence University of Chinese Academy of SciencesBeijing 101408China The State Key Laboratory of Multimodal Artificial Intelligence Systems Institute of AutomationChinese Academy of SciencesBeijing 100190China

*** disasters,including floods,storms,and tsunamis,pose a great threat to human societies.A recent study highlighted this concern,revealing that billions of people globally were exposed to flood hazards.1 In 2023,Super Typhoon Doksuri caused devasting floods in Beijing and Hebei areas,resulting in massive casualties and huge economic ***,there is a need for a precise understanding of disaster processes,reliable forecasting of disaster effects,and timely warning of risks to prevent and mitigate major disasters.2 Numerical modeling stands as the predominant approach to meet these ***,the predictive accuracy of such numerical models could be degraded because of various factors:oversimplification of real processes,computational errors,fluctuations of complex environments(e.g.,terrains,precipitations,buildings,and plants),and the influence of human activities(e.g.,evacuation and rescue)during disasters.

关键词： disaster floods storm

高屋建瓴,有企无止——访中铁咨询集团北京建筑规划设计有限公司董事长郑晓龙

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新建筑 2019年第3期 156-157页

作者：郑晓龙陈茹中铁工程设计咨询集团有限公司、中铁咨询集团北京建筑规划设计有限公司北京100055 新建筑杂志社武汉430074

中铁咨询集团北京建筑规划设计有限公司(下文称"中铁设计规划公司")是中铁工程设计咨询集团有限公司(下文称"集团")的控股子公司。集团大厦坐落于北京西站南面,站在大厦内就可以清晰看到西站全貌。特殊的地理位置亦昭示着其与铁路之间... 详细信息

中铁咨询集团北京建筑规划设计有限公司(下文称"中铁设计规划公司")是中铁工程设计咨询集团有限公司(下文称"集团")的控股子公司。集团大厦坐落于北京西站南面,站在大厦内就可以清晰看到西站全貌。特殊的地理位置亦昭示着其与铁路之间的特殊联系,集团在铁路标准设计、航测遥感、客运专线桥梁等方面一直保持领先的技术优势,并于2016年成立了院士专家工作站集团一直注重规划在整个设计链条中的战略地位,随着时代发展愈发重视,更将其提升至集团重点业务,并以自身之实力扶持公司成长。因此公司成立至今不过短短两载,但依托集团支持,开拓城乡市场、广纳四海英才、研发实用技术等举措,现已走上一条稳定发展的道路1月底本刊记者来到北京中铁设计大厦,专访了中铁设计规划公司郑晓龙董事长,郑先生将公司的源起、发展、前景娓娓道来,平实简洁的言语间透着对当下发展的坚信与似锦前程的期待。

关键词：郑晓龙董事长城市轨道交通规划设计