Stackelberg Game-Based Resource Allocation with Blockchain for Cold-Chain Logistics System

Cold-chain logistics system(CCLS)plays the role of collecting and managing the logistics data of frozen food.However,there always exist problems of information loss,data tampering,and privacy leakage in traditional centralized systems,which influence frozen food security and people’s health.The centralized management form impedes the development of the cold-chain logistics industry and weakens logistics data availability.This paper first introduces a distributed CCLS based on blockchain technology to solve the centralized management problem.This system aggregates the production base,storage,transport,detection,processing,and consumer to form a cold-chain logistics union.The blockchain ledger guarantees that the logistics data cannot be tampered with and establishes a traceability mechanism for food safety incidents.Meanwhile,to improve the value of logistics data,a Stackelberg game-based resource allocation model has been proposed between the logistics data resource provider and the consumer.The competition between resource price and volume balances the resource supplement and consumption.This model can help to achieve an optimal resource price when the Stackelberg game obtains Nash equilibrium.The two participants also can maximize their revenues with the optimal resource price and volume by utilizing the backward induction method.Then,the performance evaluations of transaction throughput and latency show that the proposed distributed CCLS is more secure and stable.The simulations about the variation trend of data price and amount,optimal benefits,and total benefits comparison of different forms show that the resource allocation model is more efficient and practical.Moreover,the blockchain-based CCLS and Stackelberg game-based resource allocation model also can promote the value of logistic data and improve social benefits.

Quantum Secure Undeniable Signature for Blockchain-Enabled Cold-Chain Logistics System

Data security and user privacy are two main security concerns in the cold-chain logistics system(CCLS).Many security issues exist in traditional CCLS,destroying data security and user privacy.The digital signature can provide data verification and identity authentication based on the mathematical difficulty problem for logistics data sharing in CCLS.This paper first established a blockchain-enabled cold-chain logistics system(BCCLS)based on union blockchain technology,which can provide secure data sharing among different logistics nodes and guarantee logistics data security with the untampered blockchain ledger.Meanwhile,a lattice-based undeniable signature scheme is designed to strengthen the security of logistics data and user privacy against quantum attacks.This scheme is based on the lattice assumption,which can provide anti-quantum security for BCCLS in the future quantum computer age.It also establishes the undeniable mechanism that guarantees that the actual signer cannot deny a valid signature.Then,security proof shows that this undeniable signature scheme is correct and safe,and an efficiency comparison shows that it is more efficient than other schemes in similar literature.The performance evaluations of transaction throughput and latency show that the proposed BCCLS is efficient and practical.This work can improve the security and efficiency of logistics data management and promote the reform and development of the logistics industry.

Spatial Structure of China's E-commerce Express Logistics Network Based on Space of Flows

The intermediate link compression characteristics of e-commerce express logistics ne tworks influence the tradition al mode of circulation of goods and economic organization,and alter the city spatial pattern.Based on the theory of space of flows,this study adopts China Smart Logistics Network relational data to build China's e-commerce express logistics network and explore its spatial structure characteristics through social network analysis(SNA),the PageRank technique,and geospatial methods.The results are as follows:the network density is 0.9270,which is close to 1;hence,indicating that e-commerce express logistics lines between Chinese cities are nearly complete and they form a typical network structure,thereby eliminating fragmented spaces.Moreover,the average minimum number of edges is 1.1375,which indicates that the network has a small world effect and thus has a high flow efficiency of logistics elements.A significant hierarchical diffusion effect was observed in dominant flows with the highest edge weights.A diamond-structured network was formed with Shanghai,Guangzhou,Chongqing,and Beijing as the four core nodes.Other node cities with a large logistics scale and importance in the network are mainly located in the 19 city agglomerations of China,revealing the fact that the development of city agglomerations is essential for promoting the separation of experience space and changing the urban spatial pattern.This study enriches the theory of urban networks,reveals the flow laws of modern logistics elements,and encourages coordinated development of urban logistics.

Delivery Invoice Information Classification System for Joint Courier Logistics Infrastructure

With the growth of the online market,demand for logistics and courier cargo is increasing rapidly.Accordingly,in the case of urban areas,road congestion and environmental problems due to cargo vehicles are mainly occurring.The joint courier logistics system,a plan to solve this problem,aims to establish an efficient logistics transportation system by utilizing one joint logistics delivery terminal by several logistics and delivery companies.However,several courier companies use different types of courier invoices.Such a system has a problem of information data transmission interruption.Therefore,the data processing process was systematically analyzed,a practically feasible methodology was devised,and delivery invoice information processing standards were established for this.In addition,the importance of this paper can be emphasized in terms of data processing in the logistics sector,which is expected to grow rapidly in the future.The results of this study can be used as basic data for the implementation of the logistics joint delivery terminal system in the future.And it can be used as a basis for securing the operational reliability of the joint courier logistics system.

Optimization Model of Cold-Chain Logistics Network for Fresh Agricultural Products —Taking Guangdong Province as an Example

Cold-chain demand of fresh agricultural products is increasing in China, while network layout of cold-chain logistics is in disorder and its cost is huge. To address this problem, this paper casts an optimal model of cold-chain logistics network and tackles it with genetic algorithms. This optimal model takes running total cost of logistics network as the objective, and embeds a nonlinear mixed integer programming including two assignment issues. The model determines optimal layout and logistics management for pre-cooling stations and logistics center for fresh agricultural products. Our main contribution is to consider construction cost and operation cost of cold chain logistics simultaneously. Case study illustrates the effectiveness of the model.

The Construction of Cold-Chain Logistics Park of Agricultural Products in Sanshui from Two-stage Perspective

This paper firstly analyzed the operation model,market positioning,market demand forecast as well as market competition and challenges,park site selection,and transportation conditions for construction of the Cold-Chain Logistics Park of Agricultural Products in Sanshui.Then,it presented the overall planning scheme for construction of the Cold-Chain Logistics Park of Agricultural Products from a progressive two-stage perspective of overall planning and stage-by-stage implementation.The first stage mainly performs the function as a transaction platform of agricultural products and meanwhile provides customers with agricultural products storage and inspection services.The second stage adds value-added services such as distribution processing,modified atmosphere storage,freezing and refrigeration,market price information distribution,E-commerce of agricultural products and personalized services.It is expected to provide references and suggestions for the construction of the Cold-Chain Logistics Park of Agricultural Products.

Research on the Challenges of Cold-chain Logistics and the Combination Ways with Logistics O2O Operation

In this paper, we conduct research on challenges of cold-chain logistics and combination ways with logistics O2O operation. Because of the cold chain logistics to the high requirement of the equipment, technology as caused the high cost of cold chain logistics. In the overall cost of China’s logistics is on the high side, under the condition of low profi t, many enterprises to enter and don’t have much interest in the field of cold chain logistics. So-called cold chain logistics is frozen food in the production, storage, transportation, sales, remain the regulations to the consumption of each link in the cold chain environment, to ensure the food quality, reduce loss of food and system engineering. Under this basis, we propose the O2O based logistics pattern that will solve the issues well.

Logistics Implications of Urban Road Pricing

Urban road pricing schemes are becoming increasingly popular among researchers and politicians as they promise a handle on increasing inner city traffic and economy as well as sustainable improvements for cities facing huge congestion and pollution problems. As in the cases of London and Stockholm, many European cities are going to implement such toll systems, especially as also the European Commission is voting for such pricing schemes in the recent white book on transportation and traffic, This research therefore provides a description of different urban road pricing schemes, their cost implications for city （last mile） transport as well as the decision and management options derived from these schemes for logistics companies. These options are furthermore checked regarding their advantages and disadvantages under the described toll schemes.

Temporal-spatial Distribution Model of Cold Chain Logistics for Vegetables

[Objective] The aim was to study on temporal-spatial distribution model of cold chain logistics for vegetables. [Method] Broccoli was taken as an example. Detailedly, time-space distribution model of cold chain logistics for broccoli was proposed from standpoints of costs and benefits based on changes of time and space, and a comprehensive evaluation was made on timeliness, efficiency, risks, added- value of products and satisfaction of information in cold-chain logistics. [Result] The efficiency of cold chain logistics for vegetable can be greatly improved by temporal- spatial distribution model of cold chain logistics. [Conclusion] Costs and benefits of vegetables in temporal-apstial distribution could be evaluated by the model.

An Analysis of the Cold Chain Logistics concerning Agricultural Products in Chongqing City

Agriculture is the foundation of the national economy. On the one hand,there is increasing demand for fresh and safe refrigerated agricultural products; on the other hand,the current cold chain logistics is relatively underdeveloped and has many problems. This paper does a research on the major large-scale agricultural cold-chain logistics companies in Chongqing,and finds that cold-chain logistics in Chongqing has some problems such as incomplete industrial chain,relatively backward infrastructure,lack of talents,and high logistics costs. Some solutions to these problems are put forward: improving chain logistics infrastructure; strengthening personnel training; building information platform to create a new model of the cold-chain logistics in the Internet era; seeking government's policy and financial support.

Improvements of City Logistics Methods in Thriasio Area, Greece

Urban freight transport is a very important part of the logistics chain. Creating the right conditions for the economic and commercial development of urban transport is extremely important. The purpose of this paper is to explore the concept of city logistics while presenting the situation in Greece, a country lagging in the implementation of good practices, and some suggestions for improving the existing reality of urban transport. In order to achieve the objectives of the present work, a review of the relevant literature and primary research, was conducted through personal interviews for the implementation of urban freight transport. The results, according to the literature, have shown that designing the right way and organizing an appropriate route for the product increases the quantities produced that are shipped for sale, either directly from the producers, through traders, suppliers, or logistics companies, which simply carry the products. Wrong design, on the other hand, leads to a complex system with significant losses, both in cost and quality. Also, according to primary research, businesses now active in the Thriasio area report the importance and positive impact they have had on the wider local community, as well as that urban shopping centers play a very important role, organizing and coordinating freight transport in the city centers. Moreover, the establishment of businesses in the center of Thriasio gives a positive impact on their establishment as their business has evolved and increased.

Exploring the drivers of urban expansion in a medium-class urban agglomeration in India using the remote sensing techniques and geographically weighted models

Rapid urbanization urges the immediate attention of policymakers to ensure sustainable city development.Under-standing the urban growth drivers is essential to address effective strategies for urbanization-related challenges.This work aims to study Raiganj’s urban development and the factors associated with this expansion.This study employed global logistic regression(LR)and geographical weighted logistic regression(GWLR)to explore the role of different factors.The results showed that the role of the central business district(covariate>-1),commercial market(covariate>-3),and police station(covariate>-4)were significant to the development of new built-up areas.In the second period,major roads(covariate>-2)and new infrastructures(covariate>-4)became more relevant,particularly in the eastern and southern areas.GWLR was more accurate in assessing the different fac-tors’impact than LR.The results obtained are essential to understanding urban expansion in India’s medium-class cities,which is critical to effective policies for sustainable urbanization.

Themes and Challenges in Making Urban Freight Distribution Sustainable

The purpose of this article is to explore and classify themes and challenges in making urban freight distribution sustainable.The study has a cross sectional design which started by a narrative literature review and analysis of a sample of related literature(like peer-reviewed articles and EU(European Union)documents).It ended with complementary discussion and recommendation for tackling the challenges.The results of the study illustrate eight and seven emerged categories of themes and challenges,respectively.It is concluded that there is great need for a packet of mixed strategies as well as a more holistic perspective where all actors together analyse and design future set-ups and operation of urban freight distribution.Such a holistic view is essential in order to:understand how different actors of the chain look upon sustainable urban freight distribution,avoid sub-optimal policies/governing rules,and suggest close-to-reality solutions for tackling the challenges.Freight distribution in urban areas is the main focus of this article.In addition,the study is demarcated to eco/environmental aspect of sustainability although it is impossible to completely exclude its interaction with economic and social aspects.The results offered in this paper provide a systematic structure for classifying issues related to sustainable urban freight distribution;something which will be beneficial for managers and policy-makers when they approach sustainable supply chain management challenges.This study provides a synthesized classification of themes and challenges which can guide researchers,industries,authorities,and policy-makers in future sustainability efforts.

新型城镇化、乡村振兴与物流业动态关系研究

探究新型城镇化、乡村振兴与物流业的互动关系,对构建经济发展新格局、促进经济高质量发展具有重要意义。因此,基于中国1998—2021年的时间序列数据,利用VAR构建三元估计模型,通过脉冲响应以及方差分解动态分析三者之间的交互关系。研究发现:新型城镇化、乡村振兴与物流业三者之间并未形成良性互动局面;新型城镇化与乡村振兴建设是促进物流业高质量发展的关键,但物流业无论是对新型城镇化还是乡村振兴的带动效果都不明显;城乡协调一体化是新型城镇化与乡村振兴的内在要求,物流业亟需变革自身发展模式,实现高质量转型,才能发挥其促进城乡融合发展、畅通经济循环的积极作用。

灵活就业人员参加城镇职工养老保险问题与对策研究——以石家庄为例

灵活就业人员在国民经济发展中发挥着重要的作用,但是我国的基本养老政策并未对灵活就业人员缴费提出刚性要求,有相当数量的灵活就业人员在被纳入城镇职工养老保险政策范围的过程中面临着诸多困难。研究从微观角度入手,将影响灵活就业人员是否参加城镇职工养老保险的因素分为个人特征、政策环境、工作环境三个维度和13个指标进行分析。得出工作满意度与选择城镇职工养老保险成正向关系;政策环境可以促进灵活就业人员选择城镇职工养老保险;个人特征的四个因素通过不同方面对灵活就业人员的行为进行影响。最终提出提升灵活就业人员的工作满意度,营造参加基本养老保险的社会氛围,完善基本养老保险相关法律法规来提高灵活就业人员的参保率。

高质量发展视域下中国城市群物流标准化效率及其影响因素研究

基于技术异质性框架,构建包含非期望产出的共同前沿-SBM-DEA模型,测算2012—2020年间中国八大城市群物流标准化两阶段效率,并分析影响效率损失的外部环境与内部企业管理等因素。研究发现:在共同前沿下,中国城市群物流标准化两阶段效率值分别为0.65和0.40,分别有35%和60%的提升空间。无效率值分解发现,总体和高、中质量城市群两阶段效率损失主要来源于管理无效率,而低质量城市群两阶段效率损失包含了技术无效率和管理无效率两方面。在效率影响因素中,FDI和企业创新氛围显著减少物流标准化两阶段的效率损失,知识产权保护只对物流标准制定阶段的效率损失减小有正向作用,政府科技支持、政府环境治理费用、金融环境、消化吸收能力只对物流标准实施阶段效率损失下降起正向作用,政府污染处罚对物流标准化两阶段效率损失均无影响。

城市外围地区农村物流设施空间分布演变及影响因素--以广州市为例

城市外围地区农村物流设施是保障城乡物资双向流通和农村产业发展的重要支撑。以广东省广州市为例,综合使用多源空间数据和空间回归模型等分析方法,探索城市外围地区农村物流设施空间分布演变特征及影响因素。在空间分布演变方面,城市外围地区农村物流设施从单核转向多核,具有圈层化、等级化特征,与广州市空间发展方向和空间格局相一致,最外围地区物流设施建设短板突出;受村级设施分布变化影响,物流设施集聚性呈现“增强—减弱—增强”的波动。影响因素方面,人口因素、交通因素和工业因素对物流设施分布有显著正向影响,农业因素对其有显著负向影响,区位因素对其无明显影响。研究结果能够丰富对农村物流设施分布演变规律的认识,为城市尺度的农村物流设施的布局优化和支撑要素的建设等提供参考。

长三角城市群物流业高质量发展水平测度研究及评价

以长三角城市群物流业为研究对象,采用熵权TOPSIS法和核密度估计分析方法,测度2010—2021年长三角城市群物流业高质量发展水平并分析区域发展差异。研究发现:长三角城市群物流业高质量发展水平向好趋势明显,但仍然有待提高。有18个城市的物流业高质量发展水平低于均值。其中上海的物流业高质量发展水平最高,居于第2位的苏州相比于上海还有较大差距。从各区域来看,区域发展不均衡的特征较明显,各区域物流业高质量发展水平存在一定差距,上海物流业高质量发展水平显著高于其他区域,物流业高质量发展水平排名靠后的城市主要集中在安徽,该区域内发展差距呈现缩小趋势。

长三角一体化城市群数字经济对物流业高质量发展的影响研究

以长三角一体化城市群为研究样本,运用2011-2020年长三角一体化城市群的数据实证检验该区域数字经济对物流业高质量发展的影响,并在此基础上进一步探讨其作用机制。研究结果表明:(1)长三角一体化城市群数字经济的发展能够推动物流业高质量发展,在进行稳健性检验后,结论依然成立;(2)从作用机制研究可以发现,长三角一体化城市群数字经济的发展能够直接推动物流业高质量发展,并且可以通过物流业全要素生产率间接推动物流业高质量发展;(3)异质性结果显示,经济越发达地区其数字经济的发展对于物流业高质量发展的推动作用越明显。根据上述研究结论提出三点政策建议:一是大力发展长三角一体化城市群数字经济与物流业,加强产业与城市间的交流合作;二是通过提高物流业全要素生产率来推动物流业高质量发展;三是根据不同城市的不同经济情况因地制宜地发展数字经济。

城市物流无人机平行航线横向间隔研究

面向未来城市物流无人机高密飞行下安全运行需求,选取空域利用率高的平行航线,聚焦平行航线运行中碰撞风险,研究同时考虑冲突频率和碰撞概率的间隔模型,提出符合安全要求的平行航线横向间隔。借鉴有人机管制经验,确定安全目标水平,并以平行航线上相邻无人机纵向距离小于纵向间隔视为冲突评判标准,再根据实际运行数据,计算区域无人机冲突实际发生频率。综合考虑无人机参数、飞行流量、空域性能、偏离概率及角度、冲突探测与解脱机制等因素,构建多参数、多约束的平行航线城市物流无人机运行场景模拟平台。引入蒙特卡洛方法,给定冲突发生频率和意外偏离概率,假设无人机以一定概率因随机意外偏离而引发无人机之间飞行冲突,模拟冲突下无人机的运行结果,记录违反测试标准的事件。设定1~51 m多个横向间隔待选值,实施510万次仿真实验并统计实验结果,结果发现:①发生违反测试标准事件共计50302起;②事故发生的概率密度与横向间隔服从负指数分布;③可采用施加合适的横向间隔策略,实现安全目标水平。基于拟合的概率密度函数,通过计算剩余风险,对比安全目标水平,确定城市物流无人机平行航线横向间隔为33米。