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RTRC:A Reputation-Based Incentive Game Model for Trustworthy Crowdsourcing Service

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China Communications 2016年第12期13卷 199-215页

作者： xindi Ma Jianfeng Ma Hui Li Qi Jiang Sheng Gao School of Computer Science and Technology Xidian University School of Cyber Engineering Xidian University School of Computer & Software Nanjing University of Information Science & Technology School of Information Central University of Finance and Economics

The ubiquity of mobile devices have promoted the prosperity of mobile crowd systems, which recruit crowds to contribute their resources for performing tasks. Yet, due to the various resource consumption, the crowds may be reluctant to join and contribute information. Thus, the low participation level of crowds will be a hurdle that prevents the adoption of crowdsourcing. A critical challenge for these systems is how to design a proper mechanism such that the crowds spontaneously act as suppliers to contribute accurate information. Most of existing mechanisms ignore either the honesty of crowds or requesters respectively. In this paper, considering the honesty of both, we propose a game-based incentive mechanism, namely RTRC, to stimulate the crowds to contribute accurate information and to motivate the requesters to return accurate feedbacks. In addition, an evolutionary game is designed to model the dynamic of user-strategy selection. Specially, the replicator dynamic is applied to model the adaptation of strategy interactions taking into account the dynamic nature in time dependence and we also derive the evolutionarily stable strategies(ESSs) for users. Finally, empirical results over the simulations show that all the requesters and suppliers will select honest strategy to maximize their profit.

关键词： crowdsourcing system evolutionary game theory evolutionarily stable strategy incentive mechanism

APPLET: a privacy-preserving framework for location-aware recommender system

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Science China(Information Sciences) 2017年第9期60卷 5-20页

作者： xindi MA Hui LI Jianfeng MA Qi JIANG Sheng GAO Ning XI Di LU School of Computer Science and Technology Xidian University School of Cyber Engineering Xidian University School of Information Central University of Finance and Economics

Location-aware recommender systems that use location-based ratings to produce recommendations have recently experienced a rapid development and draw significant attention from the research community.However, current work mainly focused on high-quality recommendations while underestimating privacy issues,which can lead to problems of privacy. Such problems are more prominent when service providers, who have limited computational and storage resources, leverage on cloud platforms to fit in with the tremendous number of service requirements and users. In this paper, we propose a novel framework, namely APPLET, for protecting user privacy information, including locations and recommendation results, within a cloud environment. Through this framework, all historical ratings are stored and calculated in ciphertext, allowing us to securely compute the similarities of venues through Paillier encryption, and predict the recommendation results based on Paillier,commutative, and comparable encryption. We also theoretically prove that user information is private and will not be leaked during a recommendation. Finally, empirical results over a real-world dataset demonstrate that our framework can efficiently recommend POIs with a high degree of accuracy in a privacy-preserving manner.

关键词： recommender system location-based service homomorphic encryption privacy-preserving frame work collaborative filtering

不同成分金属玻璃薄膜在纳米压入与划痕中的力学响应

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中国科学：物理学、力学、天文学 2023年第1期53卷 69-82页

作者：马昕迪孙康王刚上海大学材料科学与工程学院上海200444

本文通过纳米压痕及划痕测试探究了不同成分金属玻璃薄膜在纳米尺度的力学响应行为.系统地研究了具有不同脆性指数的Cu_(50)Zr_(50), Ni_(62)Nb_(38), Fe_(70)Nb_(10)B_(20)和Co_(56)Ta_(35)B_(9)四种金属玻璃薄膜在不同加载速率条件下... 详细信息

本文通过纳米压痕及划痕测试探究了不同成分金属玻璃薄膜在纳米尺度的力学响应行为.系统地研究了具有不同脆性指数的Cu_(50)Zr_(50), Ni_(62)Nb_(38), Fe_(70)Nb_(10)B_(20)和Co_(56)Ta_(35)B_(9)四种金属玻璃薄膜在不同加载速率条件下的纳米压入锯齿流变行为.结合理论计算分析了不同加载条件下金属玻璃薄膜的蠕变行为,获得了材料内部剪切转变区体积.通过纳米划痕实验探究了不同成分的金属玻璃薄膜的耐磨性.结果表明金属玻璃薄膜的流变方式依赖于加载速率的变化.剪切转变区体积大小是由玻璃的脆性指数和弛豫态结构与加载速率的共同作用所致,玻璃内部不均匀程度越大剪切转变区体积越容易受加载速率的影响.

关键词：金属玻璃薄膜纳米压痕纳米划痕力学性能

Incidence and Mortality of Acute Disseminated Encephalomyelitis in China: A Nationwide Population-based Study

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Neuroscience Bulletin 2021年第6期37卷 804-808页

作者： Yuwen Xiu Hongqiu Gu xindi Li Zixiao Li Wei-Na Jin Qiang Liu Fu-Dong Shi China National Clinical Research Center for Neurological Diseases Beijing Tiantan HospitalCapital Medical UniversityBeijing 100070China Department of Neurology Tianjin Neurological InstituteTianjin Medical University General HospitalTianjin 300052China

Dear Editor,Acute disseminated encephalomyelitis(ADEM)is an immune-mediated demyelinating disorder characterized by a widespread attack of inflammation in the brain and spinal cord that damages myelin[1].ADEM is life-... 详细信息

关键词： Acute inflammation myelitis

耐碳青霉烯类肺炎克雷伯菌脂多糖修饰相关的多黏菌素耐药机制研究

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中华微生物学和免疫学杂志 2023年第6期43卷 442-450页

作者：张鑫迪杜艳牛敏昆明医科大学第一附属医院医学检验科云南省检验医学重点实验室云南省医学检验临床医学研究中心昆明650032

目的探讨耐碳青霉烯类肺炎克雷伯菌(CRKP)脂多糖修饰相关的多黏菌素耐药机制。方法通过接合转移和mcr基因的检测探究是否存在质粒介导的耐药基因;利用实时荧光定量PCR检测多黏菌素耐药相关基因的相对表达量,并进行全基因组测序分析;采用... 详细信息

目的探讨耐碳青霉烯类肺炎克雷伯菌(CRKP)脂多糖修饰相关的多黏菌素耐药机制。方法通过接合转移和mcr基因的检测探究是否存在质粒介导的耐药基因;利用实时荧光定量PCR检测多黏菌素耐药相关基因的相对表达量,并进行全基因组测序分析;采用SDS-PAGE银染试验和MALDI-TOF-MS质谱分析检测脂多糖的改变。结果未扩增出mcr-1~8基因且接合转移试验结果为阴性,未检测到与耐药性相关的可移动元件。7株多黏菌素耐药CRKP中pmrA、pmrB、pmrC基因的相对表达量均增高,其中6株phoP/phoQ基因的相对表达量增高;3株crrA/crrB基因的相对表达量降低;4株mgrB基因的相对表达量降低。耐药株发生的错义突变位点主要位于KPHS_09430、KPHS_35900、KPHS_39520、KPHS_52420等基因上,在CRKP-6菌株中检测到ISKpn14插入序列。MALDI-TOF-MS观察到耐药菌株脂多糖中天然脂质A有L-Ara4N修饰。结论染色体介导的双组分调节系统突变引起脂多糖修饰是本研究CRKP对多黏菌素耐药的主要机制,且双组分调节系统的突变对多黏菌素耐药性的影响在不同菌株背景下也存在差异。

关键词：耐碳青霉烯类肺炎克雷伯菌多黏菌素耐药机制脂多糖双组分调节系统

An approach to quality assessment for web service selection based on the analytic hierarchy process for cases of incomplete information

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Science China Chemistry 2015年第12期58卷 71-84页

作者： GAO Cong MA JianFeng LIU ZhiQuan MA xindi School of Computer Science and Technology Xidian University

Since web services intended for the same application environment tend to be functionally homogeneous, researchers have turned to their non-functional aspects in order to constructively compare web services and choose an appropriate one. In general, quality of service is very important to users. Many schemes that consider quality assessment have been proposed for web service selection. With the increasing number of qualityrelated attributes, an effective quality assessment method needs satisfactory scalability. Schemes based on the analytic hierarchy process(AHP) meet this requirement. However, prevalent methods in this vein overlook the fact that the traditional AHP needs a complete judgment matrix. In practice, all the information needed to construct a judgment matrix is often unavailable for a variety of reasons, due to which certain judgments cannot be made. In this paper, for an incomplete judgment matrix, we propose an improved AHP approach to consistency verification and the subsequent ordering. Our method can deal with situations where information is insufficient,and inherits all the merits of the traditional AHP approach. A case study establishes the effectiveness of our proposed method.

关键词：改进的层次分析法质量评价方法不完全信息网络服务 Web服务判断矩阵可扩展性一致性验证

The Effect of Industrial Structure Change on Carbon Dioxide Emissions: A Cross-Country Panel Analysis

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Journal of Systems Science and Information 2020年第1期11卷 1-16页

作者： Jichang DONG Jing HE Xiuting LI xindi MOU Zhi DONG School of Economics and Management University of Chinese Academy of SciencesBeijing 100190China Key Laboratory of Big Data Mining and Knowledge Management Chinese Academy of SciencesBeijing 100190China Sino-Danish College University of Chinese Academy of SciencesBeijing 100190China

Reduction of carbon dioxide(CO2)emissions is one of the biggest challenges for global sustainable development,in which economic growth characterized by industrialization plays a formidable role.We innovatively adopted the input and output(I-O)table of 41 countries released by World I-O Database to determine the industrial structure change and analyze its impact on CO2 emission evolution by developing a cross-country panel model.The empirical results show that industrial structure change has a significantly negative effect on CO2 emissions;to be specific,0.1 unit increase in the linkage of manufacturing sector and service sector will lead to a decrease of 0.94 metric tons per capita CO2 emissions,indicating that upgrading industrial structure contributes to carbon mitigation and sustainable development.Further,urbanization,technology and trade openness have significantly negative impact on CO2 emissions,while economy growth and energy use take positive impacts.In particular,a 1%increase in per capita income will contribute to an increase of 8.6 metric tons per capita CO2 emissions.However,the effect of industrial structure on environment degradation is moderated by technology level.These findings fill the gaps of previous literature and provide valuable references for effective policies to mitigate CO2 emissions and achieve sustainable development.

关键词： CO2 emissions reduction industrial structure change input and output table panel model cross-country policy analysis

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数字平台自我优待行为反垄断法规制研究

价格理论与实践 2023年第9期 62-67页

作者：邹开亮王馨笛华东交通大学人文社会科学学院

自我优待是国内外数字经济反垄断执法中提出的新概念,妥善处理数字平台自我优待行为的反垄断法规制问题,有利于促进我国数字经济的健康发展。数字平台自我优待行为体现了滥用市场力量排除限制竞争的垄断本质,应适用滥用市场支配地位条... 详细信息

自我优待是国内外数字经济反垄断执法中提出的新概念,妥善处理数字平台自我优待行为的反垄断法规制问题,有利于促进我国数字经济的健康发展。数字平台自我优待行为体现了滥用市场力量排除限制竞争的垄断本质,应适用滥用市场支配地位条款进行规制。针对相关市场界定、市场支配地位认定和规制路径选择中面临的挑战和困难,为有效规制数字平台自我优待行为,应当改进平台经济场景下相关市场界定方法,重构滥用市场支配地位的多维分析架构,构建以差别待遇为主体的综合性规制路径体系。

关键词：数字平台自我优待滥用市场支配地位综合规制

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复合沉淀剂制备高质量碳酸镧及氧化镧的研究

中国稀土学报 2022年第4期40卷 624-632页

作者：张积锴郑诗礼李平杨幼明管新地周洁英陈东英江西理工大学材料冶金化学学部江西赣州341000 中国科学院赣江创新研究院江西赣州341101 赣州有色冶金研究所有限公司江西赣州341000 中国科学院绿色过程制造创新研究院中国科学院过程工程研究所北京100190

为满足稀土工业生产对环保、经济的沉淀剂及沉淀技术的需求,以氯化镧料液为原料,碳酸氢钠和碳酸钠为复合沉淀剂制备了碳酸镧和氧化镧。研究了加料方式、复合沉淀剂配比、反应温度、料液浓度、料液及沉淀剂的流量、沉淀过程pH值范围、添... 详细信息

为满足稀土工业生产对环保、经济的沉淀剂及沉淀技术的需求,以氯化镧料液为原料,碳酸氢钠和碳酸钠为复合沉淀剂制备了碳酸镧和氧化镧。研究了加料方式、复合沉淀剂配比、反应温度、料液浓度、料液及沉淀剂的流量、沉淀过程pH值范围、添加晶种等因素对碳酸镧形貌、粒度及氧化镧中Cl^(-),Na_(2)O含量和稀土总量(REO)等理化性能的影响,运用SEM、粒度分析、XRD等手段对碳酸镧或对应氧化镧形貌、粒度进行了表征。结果表明,控制复合沉淀剂中碳酸氢钠和碳酸钠摩尔比为1∶4,反应温度30℃,料液浓度为110 g·L^(-1),料液流量为6.0 mL·min^(-1),沉淀过程pH值为4.0~4.5,在添加适量碳酸镧晶种和并流加料的条件下,可获得易沉降,粒度D50为23.46μm,形貌为片状堆叠成的类球形La_(2)(CO_(3))_(3)·8H_(2)O晶体;灼烧后氧化镧产品稀土总量为99.62%,Cl^(-)和Na_(2)O含量分别为0.01%和0.001%,达到国家标准GB/T 4154-2015中La_(2)O_(3)-4N_(5)牌号要求。该复合沉淀剂成本低、无氨氮污染,避免了单一沉淀剂的缺点,通过控制沉淀剂配比和沉淀条件及过程可获得质量可控的产品,为实际生产提供了技术基础。

关键词： NaHCO_(3) 复合沉淀剂 Na_(2)CO_(3) 并流加料碳酸镧氧化镧