卫星光通信中平台抖动补偿技术研究

以卫星光通信系统为例,对空间光通信系统中光学平台的抖动进行了分析。研究了一种自调节前馈补偿技术,通过自适应信号处理或对前馈控制器进行直接优化,可对光学平台的抖动进行有效抑制。     

Factors associated with expectation of household's future financial condition

Path analysis is used to examine the causal relationships among selected objective and subjective factors associated with a household's expectation of future financial condition. Results indicate that respondents who perceive the effect of changes in the external environment on their own household's financial condition as positive are younger, have higher net worth, perceive more internal control over their situation, and report that most of the changes in the external environment are positive. Respondents who are younger, have higher income, perceive more internal control over their situation, and believe the effect of changes in the external environment on their household's financial condition are positive are more likely to be optimistic about their financial future. It is important that educators and financial advisors recognize the significant role perception of being in control plays in determining expectations of future financial condition.Journal Paper No. J-15256 of the Iowa Agriculture and Home Economics Experiment Station, Project No. 2809. Data were collected in conjunction with the cooperative regional research project NC-182, Family Resource Utilization as a Factor in Determining Economic Well-Being of Rural Families. Cooperating states are Arizona, California, Illinois, Indiana, Iowa, Kansas, Michigan, and Minnesota.Her current research interests include family financial management and consumer bankruptcy; she received her Ph.D. from the University of Missouri.She received her Ph.D. from the University of Illinois; her current research interests include gender roles, family financial management, and economic well-being.She received her Ph.D. from the University of Illinois. Her research interests are economic well-being and quality of life.Her current research interests include the economic well-being of various family forms. She received her Ph.D. from the University of Illinois.     

Cybernetic Risk Analysis

The Pearl Harbor case study reveals that risk analysis failure may be caused by any of a number of factors. However, the most important variables are system load, gain, lead time, and lag time. The dynamics of such cybernetic systems analysis constitute an important aspect in this regard. Four different risk management strategies, or organization designs, have been proposed in this paper. Each has a unique combination of the imputed variables and each has a unique cause of surprise, risk analysis failure, and crisis.     

农户病虫害统防统治服务采纳行为的影响因素——以江苏省水稻种植为例

采用嵌套Logit模型,基于江苏省病虫害统防统治试点地区630个水稻种植户的调研数据,对影响农户采纳包药防治服务与全承包防治服务的因素进行了比较分析。结果表明:在第一层次病虫害防治模式（统防统治与自防自治）采纳时,农户的病虫害防治效果认知是影响其防治模式采纳决策的重要因素。在第二层次病虫害防治方式选择时,用工补贴、宣传引导、雇工价格变异系数、服务价格、户主年龄、与农技员联系强度,对农户包药防治服务采纳决策有显著影响;用工补贴、雇工价格变异系数、户主年龄、留守劳动力人数、家庭收入水平和稻田规模,对农户全承包防治服务采纳决策有显著影响;提出应根据农户禀赋和所属地区特征提高服务供给的针对性,充分发挥村集体组织协调功能等政策建议。     

不同决策模式下农产品质量控制策略研究

农产品质量已经引起公众的广泛关注。考虑由一个供应商和一个零售商构成的两级农产品供应链,构建零售商主导下的Stackelberg分散决策博弈模型和两者协同合作下的集中决策博弈模型,以供应商和零售商的最优质量努力水平为状态变量,利用逆向求解法得出供应商和零售商的最优质量决策。研究表明:在一定条件下,农产品供应链中主体的合作可以实现供应商、零售商和整个供应链系统利润的Pareto改善,在此基础上分析实现Pareto改善的条件以推动农产品供应链达到协调。     

资本下乡：进入模式选择及其影响因素

进入模式是经济组织配置资源的重要手段。以工商资本对农户经营活动的控制权程度为依据,将工商资本投资农业的进入模式划分为“松散型”、“半紧密型”、“紧密型”三种类型。利用对广东、湖北、江苏以及云南四省151个投资主体的调查数据,采用有序逻辑回归模型分析生产因素、市场因素、制度因素以及生产技术传递能力对工商资本投资农业的进入模式选择的影响。结果表明：耕地资源优势越弱,工商资本投资农业选择紧密型进入模式的可能性越高;市场潜力越大,越倾向于选择紧密型进入模式;非正式制度越不利,选择紧密型进入模式的可能性越低;生产技术的传递能力越弱,越倾向于选择紧密型进入模式。     

兰州市洒水治污政策变迁路径与动力研究——基于定性比较分析法

以兰州市洒水车治污政策为研究案例,应用清晰集定性比较分析法（Crisp-set QCA）研究地方政府具体环保政策的变迁问题。分析发现,自上而下的政治压力、公众舆论压力、媒介压力、专家压力以及领导变更等五类8个解释变量可以作为案例政策变迁的驱动因素,其中,中央媒介压力是政策变迁的必要条件。按照不同的驱动因素组合,兰州洒水治污政策变迁有4种演进路径,其中,最短路径是“中央媒介压力且网络媒介压力”与“领导批示且中央媒介压力”。此外,在本政策案例中,领导批示不但没有促成政策变迁,甚至不构成变迁的必要条件。无论是“地方领导留言板”,还是“门户网站留言板”均非政策变迁的充分或必要条件,因此未能彰显公民参与在政策问题建构中的权力扩大,公众并没有实质拥有建构权,也未能成为建构主体,仅依赖互动平台的构建是无法打破原有的政策问题建构秩序的,因而也不能促使政策变迁彰显民意。     

汇率对中国对韩直接投资影响的实证研究

利用1989-2003年年度数据对汇率水平和波动对中国对韩国直接投资的影响进行实证研究。研究表明,人民币对韩元升值对中国对韩国直接投资有不够显著的正影响,人民币对韩元波动程度增加对中国对韩国直接投资有显著的正影响。政策含义在于：2005年人民币汇率改革对中国企业实施“走出去”战略和缓解人民币升值压力有深远影响。     

人民币实际汇率波动与中国对美出口

运用协整方法对人民币实际汇率波动与中国对美出口的关系进行实证研究。结果表明：中国对美出口收入效应极强,中国对美出口汇率波动效应较弱,中国对美出口的价格效应不存在。在美国经济可能陷入衰退的情况下,中国政府应暂缓人民币升值和人民币汇率形成机制改革的步伐。     

以公共政策为导向的户外广告规划研究——《深圳市户外广告设置指引》的探索

为了提升城市户外广告环境品质,改进规划工作的不足,提出以公共政策为导向的户外广告规划研究方法。在《深圳市户外广告设置指引》的编制实践中,通过多视角的目标建构、"规范"加"规划"的导控策略以及"手册式"的成果表达手段,取得了良好的实践效果。因此提出:为了提高户外广告规划成果的可操作性,增强实施实效性,必须正确认识户外广告的双重属性,将规划工作从传统的技术导向转变为以公共政策导向,做到导控中的因势"利导"与"力导"。