生鲜农产品供应链系统有序度评价研究——日本生协数据的实证分析与启示

文章借鉴结构熵理论建立了生鲜农产品供应链系统有序度的评价方法,将生鲜农产品供应链系统的有序度分为流通损耗有序度和可追溯性有序度,在此基础上,利用该评价方法和调研日本生协最大的分支机构——Coopnet生协所获得的一手数据,对传统的"批发市场购进——店面销售"和新型的"产直购进——宅配销售"两种生鲜农产品供应链系统的有序度进行了对比分析,并结合分析结果,总结了日本生协生鲜农产品供应链系统变革对我国农产品流通的启示。     

Financing preferences: evidence from the Korean market

We investigate the financing decisions of Korean firms during the period of 1996–2015. Korean firms follow a matching strategy for funding their cash needs. Cash inflows from investing activities are the primary source of funding for capital expenditures, and cash inflows from financing activities are the major means of covering cash outflows from financing activities. We also find that Korean firms’ financing practice of handling cash deficits can be described by the pecking order model modified and augmented by cash flow variables. Cash inflows from investing activities account for the major portion of financing to make up for cash deficits, followed by short- and long-term debt, and then equity financing.     

Predicting a flash crash in the yen/dollar foreign exchange market

I examine whether the volume-synchronized probability of informed trading (VPIN) can predict a flash crash in the yen/dollar foreign exchange market. The results show that VPIN using bulk volume classification predicted a recent event. However, VPIN using order flows, which are the amount of the ask-side transaction minus those of bid-side, does not.     

分布式嵌套阵列及其DOA估计

提出了一种分布式嵌套阵列天线结构,由两个相互独立的四级嵌套子阵构成。两个子阵间存在一个基线长度,且满足一定条件。对该阵列天线接收到的信号进行高阶累积量和Khatri-Rao积运算可以得到三个完全相同的均匀直线阵列天线结构。针对新得到的阵列天线结构,使用基于空间平滑技术的双尺度酉旋转不变子空间（ESPRIT）波达方向（DOA）估计算法对信号进行DOA估计。该方法可以有效地提高阵列天线的自由度,进而达到提高估计精度的目地。仿真结果证明了基于所提出阵列天线结构的DOA估计方法的有效性。     

Inventory model for an inventory system with time-varying demand rate

The standard inventory problems of the multi-period have been modeled under different situations. Specifically we have considered the demand subjects of a continuous distribution and a discrete distribution, and whether the demand of each period is unchanged or not. A method to get an economic order quantity in inventory systems with discrete and unchanged demand was presented in a previous paper, and this method has been generalized to an inventory model with varying continuous demand. However, it was not achieved due to there being many classified cases in the general situations. In this article the above method is discussed in the case discrete demand to determine whether it increases or decreases from period to period. A theoretical method is presented by using previous results and some examples are given which suggest how the concept can handle on inventory system. In order to make the decision, an algorithm is also presented under some conditions, and examples are shown by using the computer software program, Mathematica, which helps to explain the findings. In general cases, we view the optimal policy in the inventory problems in only a few periods.     

论消费者自主选择权的保护——以数字电视为视角

消费者自主选择权是消费者最为核心的权利之一,消费者自主选择权的正当性基础是平衡正义、消费者的弱者地位及其意思表示不自由。而数字电视提供者滥用其垄断地位以格式合同剥夺了消费者自主选择权,极大冲击了契约自由原则。政府与数字电视提供商利用"公共利益"之名合法化其自身利益,损害消费者的自主选择权。因而,应完善垄断行业消费者权益保护的相关立法、执法及诉讼机制,更好保护消费者自主选择权。     

Position-Dependent order effects on the prediction of consumer preferences in repeated choice experiments

Using stated choice data collected by experimental design with repeated choice tasks, this study developed an approach to quantify the position-dependent order effects on the prediction of preferences and marginal willingness to pay for product attributes. Results showed that repeated choice tasks allow learning to occur. Models with order effect adjustments showed significant improvements in goodness of fit. Attribute-specific polynomial trends showed the best fit among all models, which could possibly be explained by respondents’ familiarity and sensitivity to different product attributes. Repeated-choice experiments have a good potential to capture consumer preferences more accurately than the single-choice design. But order effects need to be taken into account for preferences and market prediction.     

中国上市公司现金持有动态调整行为研究

以动态面板数据方法构建的公司现金持有动态调整模型比静态模型更能够捕捉到企业现金持有的动态调整速度和调整形态,利用该模型对我国市场进行实证检验,结果表明,我国上市公司存在最优现金持有水平,但由于调整成本的存在,使得公司在偏离最优水平的情况下只能进行部分调整且调整速度较慢,并由此导致了持续性单方向调整的特殊形态。此外,企业规模、投资机会及财务杠杆等其他一些因素对现金持有动态调整过程也有显著影响。     

论政府行政方式转变下的给付行政

随着政府职能的转变,政府行政的方式也从管理转向为服务。给付行政则是政府行政方式转变的一个缩影,它的法理基础在于责任政府和生存权。当前我国给付行政需要在拓展范围、公正程序、坚持补充性和禁止过度给付等方面加以完善。     

高管薪酬、激励与公司业绩关系研究述评

关于公司业绩与高管薪酬的关系,很难用一个简单的线性关系来解答。无论是委托代理理论、信号理论、激励理论,还是契约理论,都有诸多的假设前提;而利用上市公司数据的实证研究结论又依赖于数据样本、计量方法以及公司薪酬、业绩等代理变量;因而,无论是实证研究还是理论模型研究,对公司业绩与高管薪酬的关系都未有定论。在研究我国公司高管激励问题时,还应将经济制度、法制乃至人文环境加入激励模型。