基于分形维数的重庆都市圈景区空间结构优化研究

运用分形维数和GIS空间分析工具,采用测算重庆都市圈旅游景区空间结构的集聚维数、网格维数和关联维数的方法,对其自组织演化空间特征进行研究。研究表明重庆都市圈旅游景区空间结构是分形的,旅游景区从中心向外围由密到疏,具有向河流、交通、山脉集中的趋势,都市核心区空间关联性较都市拓展区空间关联性弱,并提出"疏通文化景区脉络,打造环城观景走廊",实行"藤结瓜"型旅游景区集聚发展格局的优化策略。     

顺酐工艺技术路线的综合评价与择优

从生产成本、能耗、技术路线的先进性、操作与维护等方面对以正丁烷为原料生产顺酐的四种工艺技术进行综合对比评价，用模糊数学的方法选择最优工艺。     

Optimal control of pricing strategy for diffusion model

This study presents a conceptual framework based on the new product diffusion and demand theory models. The proposed framework was creating a probability of demand function. Considering effectiveness of demand function transmitted by adopters, the optimal control policies of pricing are conducted according to the optimal control theorv.     

Landfill Construction and Capacity Expansion

We study the optimal capacity and lifetime of landfills taking into account their sequential nature. Such an optimal capacity is characterized by the so-called Optimal Capacity Condition. Particular versions of this condition are obtained for two alternative settings: first, if all the landfills are to have the same capacity, and second, if each of them is allowed to have a different capacity. In the second case we obtain an optimal control problem, with mixed elements of both continuous and discrete time. The resulting optimization problems involve dividing a time horizon of planning into several subintervals of endogenously decided length. The results obtained may be useful to address other economic problems such as private and public investments, consumption decisions on durable goods, etc.     

基层国库现金管理的探索与思考—基于Baumol扩展模式和Miller—Orr模型的分析

本文通过对陕西汉中2009和2010年两年的国库收支状况和库存余额的简要分析,运用Baumol模型的扩展模式和Miller-Orr模型对国库最佳现金持有量做出估算,得出应进行积极现金管理的结论,提出:制定基层人民银行国库现金管理工作指导意见或管理办法,加强基层国库现金管理的理论研讨和实践指导,基层在进行国库现金管理时要建立健全监督机制,确保地方国库现金运行安全。     

可再生能源替代的整体最优动态投资策略

将能源作为经济系统中不可完全替代的限制性要素纳入生产函数,以可再生能源在总能源消费中所占比例作为替代率,来了解可再生能源替代问题在整体经济系统中的作用。基于经济发展、能源需求、温室气体(GHG)排放、能源耗竭、替代率等要素,建立可再生能源替代的动态系统的数学模型。运用最优控制理论,在期望替代路径给定的条件下,得出可再生替代能源产业理论上的最优动态投资策略,使之在满足经济持续发展对能源总需求的前提下,全社会化石能源的使用量最小,以最大限度地减少GHG排放。     

略论商业特许连锁经营的法律调整

确定企业的量佳现金持有量 ,应是一个风险与收益的权衡问题 ,既要确定最大现金短缺量、最大现金持有量和最佳现金转换量 ,又要使现金总成本达到最低。     

ON THE TIMING OPTION IN A FUTURES CONTRACT

The timing option embedded in a futures contract allows the short position to decide when to deliver the underlying asset during the last month of the contract period. In this paper we derive, within a very general incomplete market framework, an explicit model independent formula for the futures price process in the presence of a timing option. We also provide a characterization of the optimal delivery strategy, and we analyze some concrete examples.     

DUALITY IN OPTIMAL INVESTMENT AND CONSUMPTION PROBLEMS WITH MARKET FRICTIONS

In the style of Rogers (2001) , we give a unified method for finding the dual problem in a given model by stating the problem as an unconstrained Lagrangian problem. In a theoretical part we prove our main theorem, Theorem 3.1, which shows that under a number of conditions the value of the dual and primal problems is equal. The theoretical setting is sufficiently general to be applied to a large number of examples including models with transaction costs, such as Cvitanic and Karatzas (1996) (which could not be covered by the setting in Rogers [2001] ). To apply the general result one has to verify the assumptions of Theorem 3.1 for each concrete example. We show how the method applies for two examples, first Cuoco and Liu (1992) and second Cvitanic and Karatzas (1996) .