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基于多维安全视角构建数字金融基础设施安全创新体系

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信息安全研究 2024年第4期10卷 290-293页

作者：狄刚柴跃廷清华大学中国人民银行数字货币研究所全国区块链和分布式记账技术标委会清华大学工业智能与系统研究所清华大学电子商务交易技术国家工程实验室科技部现代服务业总体专家组

数字金融安全保障工作是落实金融强国6大体系的应有之义,也是做好数字金融大文章的前提.做好数字金融安全保障需基于多维安全视角,深入分析其在新的安全场景下,面临新安全威胁和新技术应用带来的挑战,要以分散风险、失陷假设、攻防相长... 详细信息

数字金融安全保障工作是落实金融强国6大体系的应有之义,也是做好数字金融大文章的前提.做好数字金融安全保障需基于多维安全视角,深入分析其在新的安全场景下,面临新安全威胁和新技术应用带来的挑战,要以分散风险、失陷假设、攻防相长、持续演进的新思路进行应对,综合云原生安全、零信任、威胁感知等新技术手段,采用新型数字金融安全模型,依托包括后量子密码技术在内的数字金融安全技术,构筑数字金融安全底座.

关键词：数字金融创新体系基础设施安全分散风险安全模型威胁感知新技术手段安全视角

Analysis of Specialized Production of Transaction Services Based on Essential Services Quantity

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Tsinghua Science and Technology 2017年第5期22卷 529-538页

作者： Li Wang yueting chai Yi Liu Department of Automation Tsinghua University

The specialized production of e-commerce transaction systems is an important research topic, which is of great significance for evaluating the development level and forecasting the development direction of e-commerce. However, there is a certain disparity between the current mainstream research model and reality, which leads to a deviated result. This paper puts forward a definition of ＂transaction efficiency＂ based on essential transaction services and establishes a model of the middleman＇s specialized production decision of transaction services. The research result shows that （1） transaction efficiency plays an important role in improving the middleman＇s specialized production level, （2） only when the transaction efficiency is higher than a certain threshold will the distribution middleman appear, and （3） the degree of economic specialization, price of commodities and transaction services, and other associated factors also affect the evolution of e-commerce transaction systems.

关键词： essential services quantity transaction efficiency transaction service specialized productionoptimization model

Analysis of a Firm's Optimal Size Based on Accessible Market Capacity

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Tsinghua Science and Technology 2020年第5期25卷 659-667页

作者： Xiao Sun Jun Qian yueting chai Yi Liu the National Engineering Laboratory for E-Commerce Technologies Tsinghua UniversityBeijing 100084China Beijing National Research Center for Information Science and Technology Beijing 100084China

E-commerce has dramatically reduced the limitation of space and time on economic activities,resulting in individuals having access to a huge number of *** this paper,we propose a company's optimal size decision model containing management costs as a means of investigating the evolution of the company size in *** that production decisions are made based on accessible market capacity,we explain how a company enters the market,and we draw an evolutionary path of the optimal company *** results show that in the early expansion stage of accessible market capacity,a firm's optimal size keeps increasing;after reaching a peak,the change in a firm's optimal size depends on its cost *** the accessible market capacity reaches a threshold,the firm will no longer be in the market,and may no longer ***,we construct a simulation framework based on complex adaptive systems to validate our proposed model.A simulation experiment confirms our model and reveals the dynamic co-evolution process of individual producers and firms.

关键词： accessible market capacity management cost firm size evolution

Analysis of Review Helpfulness Based on Consumer Perspective

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Tsinghua Science and Technology 2015年第3期20卷 293-305页

作者： Yuanlin Chen yueting chai Yi Liu Yang Xu National Engineering Laboratory for E-Commerce Technologies Tsinghua University DNSLAB China Internet Network Information Center

When consumers make purchase decisions, they generally refer to the reviews generated by other consumers who have already purchased similar products in order to get more information. Online transaction platforms provide a highly convenient channel for consumers to generate and retrieve product reviews. In addition, consumers can also vote reviews perceived to be helpful in making their decision. However, due to diverse characteristics, consumers can have different preferences on products and reviews. Their voting behavior can be influenced by reviews and existing review votes. To explore the influence mechanism of the reviewer, the review, and the existing votes on review helpfulness, we propose three hypotheses based on the consumer perspective and perform statistical tests to verify these hypotheses with real review data from Amazon. Our empirical study indicates that review helpfulness has significant correlation and trend with reviewers, review valance, and review votes. In this paper, we also discuss the implications of our findings on consumer preference and review helpfulness.

关键词： consumer preference online decision making review helpfulness behavior analysis

Architecture of Next-Generation E-Commerce Platform

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Tsinghua Science and Technology 2019年第1期24卷 18-29页

作者： Yadong Huang yueting chai Yi Liu Jianping Shen the National Engineering Laboratory for E-Commerce Technology Department of Automation Tsinghua University

E-commerce, driven by computer and internet technology, has experienced a significant growth in almost all fields during the past two decades. E-commerce has significantly changed the rules of business. Numerous research institutions and enterprises have made e-commerce more intelligent and convenient. Here, we propose a novel prototype of next-generation e-commerce platform with an architecture framework and theoretical *** subject, including the individual, enterprise, and administrative department, has his/her personalized portal to complete the subject information synchronization, supply release, demand satisfaction, and social contact. By using the personalized portal, instead of the traditional trading platform, the consumers and suppliers can complete intelligent matching transactions without intermediate traders. Moreover, the overall transaction process can be reviewed, making the transaction safer, more transparent, and more interesting. Moreover, the interconnected personalized portals solve the isolated islands of information, and the counterparts support parallel ***, this may improve the operating efficiency of the entire society.

关键词： e-commerce personalized portal accurate demand reliable supply smart cyberspace

Evolution of Specialization with Reachable Transaction Scope Based on a Simple and Symmetric Firm Resource Allocation Model

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Tsinghua Science and Technology 2017年第1期22卷 10-28页

作者： Xiao Sun yueting chai Yi Liu Jianping Shen Yadong Huang National Engineering Laboratory for E-Commerce Technologies(NELECT) Tsinghua UniversityBeijing 100084

In the last decade, as an emerging transaction measure driven by computer and internet technology, e-commerce experienced explosive growth in many areas. It has greatly broken down the limitations of space and time to economic activities, thus changing the rules of business fundamentally. Significant work has been done to understand the laws of e-commerce from multiple dimensions, but the question of how e-commerce shapes firms＇ specialization and market structure from the perspective of spatial factors remains obscure. In this paper, we propose a simple and symmetric firm resource allocation model with a specialized-economy production function and market size constraint, to investigate how individual firms adjust resource allocation with reachable transaction scope expanded. It is shown that with the expansion of reachable transaction scope, individual firms discretely take back one unit resource from a low-investment direction and, instead, channel it to a ＂specialized direction＂. Meanwhile, at the macro level, an optimal division network evolves from a static self-sufficient stage to a diverse semi-specialized stage, and finally to a highly integrated completely specialized stage. Ergo, a Complex Adaptive System （CAS） based simulation framework is constructed. Designed simulation experiments are carried out and confirm to the analysis result of our proposed model.

关键词： e-commerce evolution reachable transaction scope resource allocation complex adaptive system

Infra-Marginal Analysis Model for Provision Mode Selection for E-commerce Services

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Tsinghua Science and Technology 2014年第2期19卷 174-183页

作者： Xiao Yu yueting chai Yi Liu Hongbo Sun the National Engineering Laboratory for E-Commerce Technology Department of AutomationTsinghua University

E-commerce has grown extraordinarily since the emergence of the internet, and many types of services are employed to accelerate this process. Service quality and productivity are two critical indicators to evaluate the competitiveness of e-commerce companies. Deciding which provision mode of e-commerce services （buy, sell, or self-provide） to adopt is a key operational strategy issue. This paper investigates the conditions and limitations of e-commerce services＇ optimal supply modes, and proposes a cost oriented infra-marginal model where service demand is considered an exogenous variable due to its non-elastic and unprofitable characteristics. By analyzing the main impact factors of this model, this paper infers provision mode selection strategies, which are determined by four factors： transaction cost, service price, service demand, and competitive advantages. Decision trees are derived from these strategies to help e-commerce companies make appropriate decisions. Finally, the proposed model＇s feasibility is verified by two case studies.

关键词： e-commerce services provision mode selection e-commerce infra-marginal analysis cost minimizing

Frictional contact analysis of a rigid solid with periodic surface sliding on the thermoelectric material

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Applied Mathematics and Mechanics(English Edition) 2024年第1期45卷 179-196页

作者： Yali ZHANG yueting ZHOU Shenghu DING School of Mathematics and Statistics Ningxia UniversityYinchuan 750021China School of Aerospace Engineering and Applied Mechanics Tongji UniversityShanghai 200092China

Understanding and characterizing rough contact and wavy surfaces are essential for developing effective strategies to mitigate wear,optimize lubrication,and enhance the overall performance and durability of mechanical *** sliding friction contact problem between a thermoelectric(TE)half-plane and a rigid solid with a periodic wavy surface is the focus of this *** simplify the problem,we utilize mixed boundary conditions,leading to a set of singular integral equations(SIEs)with the Hilbert *** analytical solutions for the energy flux and electric current density are obtained by the variable transform method in the context of the electric and temperature *** contact problem for the elastic field is transformed into the second-kind SIE and solved by the Jacobi ***,the smoothness of the wavy contact surface ensures that there are no singularities in the surface contact stress,and ensures that it remains free at the contact *** on the plane strain theory of elasticity,the analysis primarily examines the correlation between the applied load and the effective contact *** distribution of the normal stress on the surface with or without TE loads is discussed in detail for various friction ***,the obtained results indicate that the in-plane stress decreases behind the trailing edge,while it increases ahead of the trailing edge when subjected to TE loads.

关键词： wavy surface periodic contact thermoelectric(TE)material Hilbert integral kernel

Identifying the enhancement mechanism of Al/MoO_(3) reactive multilayered films on the ignition ability of semiconductor bridge using a one-dimensional gas-solid two-phase flow model

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Defence Technology（防务技术） 2024年第3期33卷 168-179页

作者： Jianbing Xu Yuxuan Zhou Yun Shen yueting Wang Yinghua Ye Ruiqi Shen School of Chemistry and Chemical Engineering Nanjing University of Science and TechnologyNanjing 210094China Micro-Nano Energetic Devices Key Laboratory of MIIT Nanjing 210094China Institute of Space Propulsion Nanjing University of Science and TechnologyNanjing 210094China

Energetic Semiconductor bridge(ESCB)based on reactive multilayered films(RMFs)has a promising application in the miniature and intelligence of initiator and pyrotechnics *** the ignition enhancement mechanism of RMFs on semiconductor bridge(SCB)during the ignition process is crucial for the engineering and practical application of advanced initiator and pyrotechnics *** this study,a one-dimensional(1D)gas-solid two-phase flow ignition model was established to study the ignition process of ESCB to charge particles based on the reactivity of Al/MoO_(3) *** order to fully consider the coupled exothermic between the RMFs and the SCB plasma during the ignition process,the heat release of chemical reaction in RMFs was used as an internal heat source in this *** is found that the exothermal reaction in RMFs improved the ignition performance of *** the process of plasma rapid condensation with heat release,the product of RMFs enhanced the heat transfer process between the gas phase and the solid charge particle,which accelerated the expansion of hot plasma,and heated the solid charge particle as well as gas phase region with low *** addition,it made up for pressure loss in the gas *** the plasma dissipation process,the exothermal chemical reaction in RMFs acted as the main heating source to heat the charge particle,making the surface temperature of the charge particle,gas pressure,and gas temperature rise *** result may yield significant advantages in providing a universal ignition model for miniaturized ignition devices.

关键词： Ignition enhancement mechanism 1D gas-solid two-phase flow Al/MoO_(3)reactive multilayered films Semiconductor bridge Miniaturized ignition device