基于MATLAB的改进BP神经网络的实现与比较

本文在Black-Scholes型市场中引入机会收益的概念,并利用文[4]中提出的在险收益的风险概念,建立了机会收益-在险收益(EaC-EaR)动态投资决策模型maxR=E[Xπ(T)|Xπ(T)≥ρ1-β(x,π,T)]s.t.EaR(x,π,T)≤Cπ∈Rd,其中C是事先给定的某风险水平,ρ1-β(x,π,T)是期末财富Xπ(T)的1-β下侧分位数.通过对该模型的讨论,得到了最优常数再调整策略的显式表达式以及投资组合的有效前沿,阐明的金融学涵义包括:在EaC-EaR投资组合模型下,风险中性市场中的最优常数再调整投资策略是纯债券投资策略,而风险非中性市场中的最优常数再调整投资策略蕴涵了两基金分离定理的成立.另外,β=1时的均值-在险收益(M-EaR)模型maxR=E[Xπ(T)]s.t.EaR(x,π,T)≤Cπ∈Rd正是上述模型的特款.     

车用三效催化转化器劣化性能数值模拟

本文提出了证券投资组合的一个新模型.该模型综合考虑了证券的收益率、证券分红和证券价格的关系,并将证券分红和证券价格作为系统的随机参数处理,建立了证券投资组合的随机规划模型.利用机会约束规划方法,我们研究了将所建立的随机规划模型转化为普通光滑优化问题求解的方法,得到了该类问题求解的有效途径.     

政府投资工程项目比选制度的法律分析

地方法律法规与民众关系密切，研究地方法治建设具有重要意义。以四川省政府投资工程建设项目比选制度为对象，梳理其形成，归纳其概念，在对比选制度进行法理分析和实证分析的基础上，提出完善措施，以期学界同仁关心地方法治建设。     

浅析中国木材产业的国际化经营问题

国际化经营是影响中国木材产业的重要因素,对于中国木材产业的成长具有重大意义。该文介绍了国际化经营的相关概念,分析了中国木材产业国际化经营的现状,研究了进出口和对外直接投资对中国木材产业的影响,提出了中国木材产业国际化经营的演化路径。     

Research of Investment and Cash Flow Constrain Under Ownership Concentration

This article summarizes the theory achievements,arguments,the investment and ownership concentration model which studied in investment-cash flow and the stockholder's rights structure questions.The financing restraint is explained.The special social stratum shareholder is elaborated which influences relation between investment and internal cash flow by the financing restraint existing in the enterprise,the management opportunism hypothesis and the information assymetrical theory separately.Finally the authors induce and study the real diagnosis model of the supposition(above).The model is important for the empirical study of ownership structure influencing to corporate investment.     

Tourism

The development of tourism in New Zealand during the 1990s reflects an intensification of many of the trends that were beginning to emerge in the latter part of the preceding decade, notably in terms of growth and change. The environment for tourism in the 1990s, however, was more fluid and challenging than it had been earlier. Growth continued, despite some major perturbations due to such factors as the Asian economic crisis. The industry proved its resilience and ability to adapt to changing conditions, institutional restructuring occurred and tourism in New Zealand generally became more diverse and complex. Increasing attention, but not much action, was directed at some of the externalities that the growth of tourism was generating.     

江苏省农村公共投资现状及不同类型农村居民对公共投资期望的个案考察

在把握江苏农村公共投资现状基础上,通过个案调查对农村居民公共物品需求进行考察并提出相应政策建议。笔者研究发现,农村居民公共物品需求明显表现出“生产第一、生活第二”规律,不同类型农村居民对公共投资的期望不存在显著差异;虽多数农村居民认识到“投资非农产业收益较高”,但多数农村居民仍非常重视农业生产,对农业生产公共物品的政府投资抱很大期望;农村居民对公共物品的期望排序与宏观层面农村公共投资收益率大小次序基本一致,农村居民急需的公共物品也是政府投资收益率较高的公共项目。     

Analysis on Unbalance of Real Estate Investment Goal under the Environment of High Profit Margin

With incessant development of Chinese real estate market, the amount and size of real estate corporations are enlarging rapidly and the real estate corporation investment goal is tending to become divertive. So it is especially important to understand rightly the investment goal of the real estate corporations. This paper analyzes the unbalance phenomena of real estate corporation investment under the environment of high profit margin and discusses the serious aftereffect from this unbalance. Finally this paper brings forward the right order of investment goals for the real estate corporations in order to contribute to a nicer performance of real estate corporations in establishing sustainable development stratagem.     

干旱灾害背景下宁夏避灾农业经营模式的地域构架

宁夏农业生态环境的干旱化趋势,已经成为制约区域农业可持续发展的主要障碍。在干旱灾害环境背景下,基于区域内部环境质量的非均质性,初步提出并构建了宁夏避灾农业经营模式,即引黄灌区高效集约与规模经营的避灾农业亚模式和南部山区高效利用与综合发展的避灾农业亚模式。较以往农业发展模式,避灾农业生态模式更具经济上易于接受,运行上易于操作,收益上高效的特点,特别是对于优化农业投资环境,实现区域可持续发展意义重大。     

宁夏农业生态环境保护投融资的初步研究

阐述了宁夏农业生态环境的现状,由于自然环境因素、乡镇企业的发展、化肥农药农膜的不合理使用等人为因素的影响,使得该地区的农业生态环境破坏进一步加剧。分析宁夏农业生态环境投融资现状及原因,一是投融资总量不足,二是投资效率不高。提出完善宁夏农业环境保护投资体制,提高资金的运作效率,拓宽农业生态环保融资渠道,采用多种融资方式提高农业生态环境保护投入,逐步改善农业生态环境。