企业短信服务系统的设计与实现

文章在分析企业信息处理流程的基础上,设计了企业短信息服务系统。该系统借助于Internet,以TCP/IP协议和移动通信为基础,通过中国联通短信网关将互联网和联通网连接起来,实现异地信息的实时收集及传递,为企业信息发布提供了一个新的解决方法,提高了信息传递及交流的效率,投入使用后,效果良好,满足设计要求。     

行为资产组合理论：理论基础、内容及对异象的解释

行为金融理论于20世纪80年代兴起，它通过将行为因素引入决策过程从而对传统的金融理论做出补充。谢夫林(Shefrin)和斯特曼(Statman)在现代资产组合理论的基础上提出了行为资产组合理论，该理论是行为金融的理论基础之一。行为资产组合理论的基础包括安全第一组合理论和安全、潜力和期望理论。内容分为单一账户资产组合理论和多重账户资产组合理论。行为资产组合理论能够对市场中的一些异象做出合理的解释。     

地区专业化、产业集中与经济集聚——对我国制造业的实证分析

以新经济地理学模型为基本理论框架,对我国各省区专业化水平、制造业各行业的集中程度和整个制造业的集聚程度进行了实证分析,结果显示1993—2003年间我国各省份的专业化水平呈显著上升趋势,制造业大部分行业集中程度提高,整个制造业集聚程度上升。在制造业各行业集中程度和整个制造业集聚程度的测算中,引入SP指数,结果显示这一指标的引进是非常必要的。     

An information-theoretic approach for forecasting interval-valued SP500 daily returns

We develop an iterative and efficient information-theoretic estimator for forecasting interval-valued data, and use our estimator to forecast the SP500 returns up to five days ahead using moving windows. Our forecasts are based on 13 years of data. We show that our estimator is superior to its competitors under all of the common criteria that are used to evaluate forecasts of interval data. Our approach differs from other methods that are used to forecast interval data in two major ways. First, rather than applying the more traditional methods that use only certain moments of the intervals in the estimation process, our estimator uses the complete sample information. Second, our method simultaneously selects the model (or models) and infers the model’s parameters. It is an iterative approach that imposes minimal structure and statistical assumptions.     

论SP监管乏力及法律对策

当前非法有害信息泛滥于移动通信网络,造成严重的社会危害后果,归根到底是SP监管乏力所造成。现行SP监管法律规定欠完备,监管主体错位,监管方式单一,监管内容难辨以及监管处罚乏力是造成监管乏力的主要原因。据此,应该加快立法,提供SP监管法律依据;多管齐下,健全SP内部监管体制;齐抓共管,完善SP监管配套举措,才可以有效解决SP监管乏力的诟病。     

Valuing a Change in a Fishing Site without Collecting Characteristics Data on All Fishing Sites: A Complete but Minimal Model

Resource economists are often asked to value a proposed change at one, and only one, recreational site; the model we develop and estimate is applicable for those cases. The application is valuing the elimination of fish consumption advisories on a large bay on Lake Michigan. The model is minimal but complete: complete in that the choice set is not restricted, minimal in that only two conditional indirect utility functions are estimated. It is utility-theoretic and one does not have to collect characteristic data on all of the other fishing sites in the region. Data include the number of trips each individual currently takes to Green Bay, answers to "would you prefer to fish Green Bay under conditions A or B?" and how often each angler says they would fish Green Bay under different sets of conditions.     

武汉城市圈制造业行业专业化实证分析

本文运用2000－2007年间的统计数据,采用SP指数并结合集中度指标,对武汉城市圈制造业行业专业化程度进行了详细测度。研究结果表明：城市圈制造业整体上趋于集中,而从考察的19个行业看,趋于集中和分散的行业数大体相当;进一步分析行业类型发现,空间趋于分散的大多为资源性和低技术行业,而绝大多数中高技术行业集聚明显。同时,从2007年的横截面SP指数和集中度值都可以发现,中高技术行业在空间上更为集中,而资源性和低技术行业则相对分散;考察行业在各城市的分布可以发现,整体上武汉、黄石、黄冈和孝感4市行业集聚较为明显,并且从行业的技术含量分类看,城市圈形成了以武汉等4市为＂中心＂,另外5市为＂外围＂的制造业＂中心-外围＂空间结构。     

我国沿海省市制造业集聚变动的实证分析

我国沿海省市制造业有明显的产业集聚现象.以新经济地理学模型为基本理论框架,借助产业空间集中程度(SP指数)和绝对集中度(CRn)两项指标,计算1998-2006制造业内部28个行业变化趋势,尝试对我国东部沿海省市制造业近年来的发展状态进行定量评价.结果显示:随着我国东部沿海省市经济的发展,各行业的集中趋势仍是主流,绝大部分行业呈集聚加强趋势,而在区域空间方面出现集聚和衰退两种发展趋势.     

International migration and universal healthcare access: evidence from Mexico’s ‘Seguro Popular’

Although ‘Seguro Popular’ (SP), a healthcare programme for the uninsured, has been in place in Mexico for more than a decade, its consequences for international migration both to and from the country have received little scholarly attention. Using the spatial variation in the programme’s coverage generated through the rollout over time, this paper examines the effects of SP on the number of emigrants and return migrants per household. Based on data from Mexico’s National Survey on Demographic Dynamics for 1997–2014, the analysis confirms that being affiliated to SP does not reduce the number of emigrants per household, but such affiliation is, however, positively related to the number of returnees per household. These results are valid across different subsamples of the population and time periods and are robust to omitted variable bias. Our findings have important implications for understanding the effects of social protection policies on international migration patterns.     

基于交通运输方式选择的旅客出行时间价值研究

为了研究旅客出行时间价值与交通方式选择的动态关系,更好地掌握旅客出行方式,在研究国内外关于旅客出行时间价值与交通运输方式选择问题相关文献的基础上,基于旅客角度,阐述了旅客出行时间价值与交通运输方式选择之间的互动关系。以京沪客运通道旅客出行意愿为面向对象,充分考虑旅客的社会经济属性、出行性质属性以及交通运输方式特征属性,通过SP调查研究出行时间价值与交通运输方式选择之间的互动关系,提出了基于消费者效用最大化理论的非集计模型。通过模型推导计算发现:旅客出行方式选择与其经济水平、出行属性密切相关,经济条件和出行属性优越者更倾向于选择快速性与舒适性更好的交通运输方式。研究结果可为交通管理部门科学合理地评估时间价值效益、有效进行交通规划与管理提供参考。