供应链视角下餐饮O2O模式的配送路径优化

O2O最后一公里配送往往需要综合考虑时间和成本的关系,研究平台对订单的分配和路径优化对提升O2O供应链的整体效率和产业链升级具有十分重要的意义。从餐饮商家和O2O平台两个主要参与者出发对物流配送系统进行研究,提出了适合于O2O餐饮供应链的配送网络,并考虑道路阻塞、最大里程数等约束,搭建了上层模型最短时间、下层模型最低成本的双层规划模型,进而通过NSGA-Ⅱ算法求得可行解,最后验证了算法的可行性,为进一步研究O2O配送提供了新的解决思路。     

地利共享:土地财政的制度合法性

土地财政作为地方政府财政收入的重要来源,成为地方政府提供基础设施建设和社会公共服务的物质基础。在城市化的快速发展中,土地财政成为必不可少的动力。随着城市化进程的加速,土地管理法的修订,土地财政的合法性颇受争议。从合法性的制度视角看,地利共享是土地制度合法性源泉,体现在规制性、规范性和认知性三方面。但是,土地财政的地利共享合法性也面临着规制上的多变和复杂,规范上的迷离和离散,认知上的背离与缺失三方面的危机。化解土地财政的合法性危机,需要对土地财政地利共享的合法性进行重塑:规制层面上,完善土地管理法律体系,坚持土地使用的宪法底线;规范层面上,坚持土地改革的局部试点,谨慎推行全局式的土地改革策略;认知层面上,完善土地财政使用渠道,探索更加多样的土地增值分配方式。     

Factor state–space models for high-dimensional realized covariance matrices of asset returns

We propose a dynamic factor state–space model for high-dimensional covariance matrices of asset returns. It makes use of observed risk factors and assumes that the latent integrated joint covariance matrix of the assets and the factors is observed through their realized covariance matrix with a Wishart measurement density. For the latent integrated covariance matrix of the assets we impose a strict factor structure allowing for dynamic variation in the covariance matrices of the factors and the residual components as well as in the factor loadings. This factor structure translates into a factorization of the Wishart measurement density which facilitates statistical inference based on simple Bayesian MCMC procedures making the approach scalable w.r.t. the number of assets. An empirical application to realized covariance matrices for 60 NYSE traded stocks using the Fama–French factors and sector-specific factors represented by Exchange Traded Funds (ETFs) shows that the model performs very well in- and out of sample.     

新型抛料分配式多点卸料输送机的研发与应用

通过对比几种常用的粮食入仓多点卸料设备所存在的问题,综合考虑绿色节能、密闭环保、可靠方便等方面,本文研制了一种新型抛料分配式多点卸料输送机,在国内多个项目中得到了很好的应用。     

济南市古生物化石赋存特征及保护区划研究

为贯彻《古生物化石保护条例》,提高济南市古生物化石保护水平,在对区内古生物化石资源进行野外勘查和综合整理的基础上,依据古生物化石鉴定结果及其赋存地层分布特征,得出济南市古生物化石的分布特征,划分了古生物化石产地,选择化石完整程度、富集程度、剖面出露程度、周边地质环境、工程活动影响五个评价因子,运用综合指数法,建立了符合济南实际的古生物化石保护区划分体系,将区内古生物化石产地进行了保护区分级,并按照“保护优先,结合实际”的原则,制定了符合济南市实际的古生物化石保护措施。     

Functional income distribution,capacity utilization,capital accumulation and productivity growth in Turkey: A post-Kaleckian analysis

The aim of this article is to examine the relation between functional income distribution, capacity utilization, capital accumulation and productivity in Turkey by identifying demand and overall regimes prevalent in the economy. For this purpose, we conducted an empirical analysis using different specifications of the post-Kaleckian model of Hein and Tarassow. This model defines and characterizes an overall regime by endogenizing productivity growth and integrating it into the models in this tradition. Empirical findings show that while the demand regime is wage-led, the overall regime turns out to be unstable in Turkey due to the destabilizing impact of productivity growth. This article contributes to the literature by being the first study that simultaneously identifies the demand and the overall regimes of an economy.     

Heterogeneity and netting efficiency under central clearing: A stochastic network analysis

This paper examines the effect of heterogeneity in clearing members’ exposure management practices under central clearing. Our network model specifies the dynamics of prenetted interbank exposures to shape interdependent exposure distributions beyond normality. Employing over-the-counter derivatives market data from the U.S. Office of the Comptroller of the Currency, our simulation results indicate that heterogeneity in bank-to-bank exposure dynamics is systemically desirable, while the entire system benefits more from the central clearing in more homogeneous environments. Policymakers should incentivize individual clearing members to enhance resiliency and stability in counterparty exposure management to maximize netting efficiency under central clearing.     

全域旅游示范区空间分布特征及影响因素分析

［目的］全域旅游示范区的确立为旅游业增添了新的旅游吸引模式，成为新时期我国旅游产业转型升级的重要途径之一。［方法］文章利用ArcGIS102，运用最邻近距离法、不均衡指数、核密度分析、等方法，对标记在地图上的500个全域旅游示范区的空间分布特征进行分析，并探究其空间分布差异的影响因素。［结果］（1）示范区空间分布不均衡，呈典型的聚集型分布，从区域角度来看，西部地区示范区数量多于东部地区，中部地区相对较少，与传统认知上的示范区分布格局存在一定错位； （2）示范区空间分布密度存在明显差异，其中江浙皖、湘赣交界、晋豫交界、陕渝交界等地区示范区聚集最多，形成显著的高密度区； （3）示范区规模度差距较大，上海、北京、江苏、天津等省市规模度较大，其他省市规模度较小； （4）示范区空间分布受到资源禀赋、区位交通、社会经济、政策环境等因素影响较大，呈现“傍景”“环路”的分布格局。［结论］全域旅游示范区空间分布不均衡，各省市既要挖掘自身核心竞争力，也要加强区域协调发展，突出示范区模范带头作用，达到辐射周边市县的效果，实现全域旅游资源优化配置。     

Where to donate: The geographical distribution of corporate philanthropy in China

An emerging body of literature has demonstrated that corporate philanthropy can be an important part of a company’s business strategy. However, we know relatively little about how companies allocate philanthropic resources to achieve their strategic targets. Using geographical distribution data on corporate philanthropy in China from 2009 to 2016, we provide robust evidence of companies’ revenue-driven regional favoritism. Specifically, companies donate more to regions where they obtain revenue than to other regions. Further evidence suggests that this revenue-driven regional favoritism may have both reputational and political motivations. Further analysis suggests that China’s targeted poverty alleviation policy has compromised revenue-driven regional favoritism while increasing the amount of money donated to poor regions. Overall, we enrich understanding of decision-making on corporate philanthropy. We also demonstrate that companies can use the geographical distribution of corporate philanthropy strategically to obtain consumer and government favor in regions where they operate. The results also provide evidence at the micro company level of the effect of China’s implementation of a targeted poverty alleviation policy.