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Search Results: 1 - 10 of 87392 matches for " 周艺 "
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资本限量条件下的投资选择决策模型

财会月刊 , 2010,
Abstract: 在项目投资决策中,确定净现值一直是一个难题。为此,本文以区间数表示投资项目的净现值,建立了资本限量条件下投资选择的一个模糊整数规划模型,然后根据模型的特征,提出了一种新的分类隐数搜寻方法,由此可以确定最佳的组合投资选择方案。【关键词】资本限量净现值投资决策模糊整数规划模型资本是有限的,而市场投资需求是无限的。资本限量决策是指企业在一定限度资金的条件下,对所有可供选择项目采用一定的方法进行有效组合,使所选择的一组投资项目既能满足资金的供给能力,又能使企业获得最大的收益的一种投资决策分析方法。资本限量条件下项目投资决策方法的基本原则是充分有效地利用资本,使有限的资本产生出最大的效益。如何将有限的资本配置到具有最佳经济效益的项目中,是每一个投资决策者非常关心的问题,也是投资学的一个重要课题,目前普遍使用的投资决策模型主要有净现值法和内含报酬率法、互斥组合法等。净现值法在项目投资决策、债券评价、长期投资决策等方面被广泛应用,是评判经济活动的一个重要方法,而该方法所采用的指标也是项目财务评价和社会经济评价的重要指标之一。
基于2011计划的高校创新驱动机制设计研究
Research of Designing Innovative Drive Mechanism for University Base on the 2011 Plan
 [PDF]

志方,
Creative Education Studies (CES) , 2015, DOI: 10.12677/CES.2015.34019
Abstract:
本文以高等学校创新能力提升计划(2011计划)之“三位一体”创新能力提升为指引,从组织管理体制、人事管理制度、人才培养模式、科研组织模式、评价激励机制、资源配置方式六个角度,设计了一套可供高校借鉴的创新驱动机制,通过组织流程再造、人事制度变革、科研组织优化等九大创新措施,进一步促进高校的体制机制改革创新,实现人才培养、学科建设、科学研究的全面提升。
This paper designs a set of innovation drive mechanisms for college and university from the six angles: organization management system, personnel management system, personnel training mode, research organization model, evaluation incentive mechanism and resource allocation, based on the “Trinity” innovation ability of higher school innovation ability (2011 plan). Through the organization process reengineering, personnel system reform, scientific research organization optimization and other innovative measures, the reform and the innovation of the university’s institutional mechanisms are further promoted and the comprehensive promotion of personnel training, discipline construction and scientific research is achieved.
Web Retrieval Optimization Model Based on User''s Query Intention Identification
基于用户查询意图识别的Web搜索优化模型

,
计算机科学 , 2012,
Abstract: A Web retrieval optimization model was proposed based on the analysis and classification of user's query intendon. It focuses on user's query intention identification,and can both ensure match user's query intention accurately and filter useless information automatically by means of characteristic word of query intention, content keyword and user's ctuery behavior. Comparing with related work. This paper focused on user's query intention and user's satisfaction. Experimental results show that the model can improve significantly the accuracy in information retrieve and users'satisfaction compared with traditional methods.
基于用户查询意图识别的web搜索优化模型
,元?
计算机科学 , 2012,
Abstract: 在对用户查询意图进行分析分类的基础上,提出了一种web搜索优化模型。该模型通过识别用户查询意图来查询意图特征词和内容主题词的双重约束,再结合用户查询行为获得查询目标,既保证了用户查询意图的准确匹配,又自动过滤和屏蔽了不相关信息。与相关工作对比,其重点在于准确获取用户查询意图,提高用户满意度。实验结果表明,该模型在实现信息搜索准确性和用户对查询结果满意度方面比传统搜索方法有明显改善。
Evaluation Information System for Regional Sustainable Development
区域可持续发展评价系统研制

ZHOU Yi,

遥感学报 , 2003,
Abstract: In the last three decades,sustainable development(SD)has been proposed and developed as a new development model.In China,SD has been confirmed as one of the two basic strategies(the other one is"Developing through science & education")for national development.We define regional sustainability development as the continuous support of human quality of life within a region's ecological carrying capacity.To achieve regional sustainability development,one must first assess the current situation.Until now,studies on SD have been mainly focused on two domain,one is the concepts and theory of SD and the other is the effectively realizing processes of SD,while few studies were carried out on evaluation methods of SD.Recently the application of Geo-spatial information technology in SD assessment,has gained great attention,mainly because the conventional statistic methods cannot satisfy the requirements of SD assessments. A concept-ual model of regional SD assessment,using high spatiod-temporal resolution remote sensing satellites as an important data sources,was built based on some essential achievements such as Human Development Index(HDI)and ecological footprint.In the conceptual model,'development'and 'sustainability' were used as two primary criteria to evaluate the regional SD situation. Evaluation Information System for Regional Sustainable Development (EIS/RSD) was developed based on the above-mentioned conceptual model. The system has a number of application models,which can be used for further analysis of original data. The analysis result can be displayed using map and chart. This paper presents the aim,developing scheme,conceptual model,function and assessment method of evaluation information system for regional sustainable development.
生长素与油菜素甾醇相互作用机制的研究进展
, 薛红卫
中国科学 生命科学 , 2013, DOI: 10.1360/052013-319
Abstract: 植物生长发育是一个复杂、精细的调控过程,涉及细胞、组织和器官间多层次的信息交流,激素在其间发挥了重要调控作用.生长素和油菜素甾醇(BR)都能促进植物伸长,随着对其作用机制研究的深入,人们发现它们协同调控很多生理过程,对二者作用机制和信号转导的相互作用研究也成为激素研究领域的热点之一.对生长素和BR转导途径的揭示及直接下游基因的大规模发掘为二者通过相互作用调控不同生理过程的机制研究提供了重要线索.生长素和BR的相互作用涉及到下游基因转录的调控、信号组分互作以及合成代谢和极性运输等多层次的调控.
极端情况下对我国股市风险的实证研究
,
中国管理科学 , 2012,
Abstract: ?准确地度量风险是对风险进行有效管理的前提也是投资者做出合理的投资决策的基础,然而在极端事件频繁发生的情况下,传统的VaR计算方法难以准确地度量股市风险,极值理论却可以很好地解决这一问题。本文特别关注了由2007年美国"次贷"危机所引发的全球金融危机爆发时我国股市的风险度量问题,考虑到全球股市间极端事件的联动效应,利用基于极值理论的POT模型对上证综指日收益率的尾部数据直接建模拟合分布,进而计算出风险值VaR和CVaR,通过比较危机前后的风险值,发现随着金融危机的到来,我国股市的风险有了一定程度的释放。
牛心包引导骨组织再生的实验研究
,吴汉江
华西口腔医学杂志 , 2004,
Abstract: 目的评价戊二醛(GA)处理的牛心包作为引导骨组织再生材料的可行性。方法在II只狗的双侧下领骨颊侧骨板各制备一个1.0cmx1.Ocmx0.5cm大小的骨缺损,随机在一侧骨缺损覆盖GA牛心包,另一侧不覆盖膜作为对照侧。术后2周,4周,8周,16周采用Dental-CT及组织学切片观察骨缺损修复情况。结果①10只狗伤口愈合良好,1只狗(16周组)牛心包处理区伤口愈合欠佳;316周内牛心包未见明显吸收,周围仅少量炎性细胞浸润;③牛心包覆盖侧骨缺损修复速度快于对照侧。结论①GA牛心包有良好的引导骨组织再生作用,牛心包有可能成为一种新的引导骨组织再生材料;②GA处理的牛心包有良好的生物相容性。
基于迁移家庭资产选择行为的资产组合设计研究
,通平
南京农业大学学报(社会科学版) , 2018,
Abstract: 本文从设计心理学的动力角度对农村向城镇迁移的居民家庭(即迁移家庭)开展数据调查,探究迁移家庭金融资产选择的行为特征,及引起该行为特征的心理动力因素。研究发现,迁移家庭金融资产结构存在失衡,房产投资对其金融资产选择行为存在一定的"挤出效应";有序的Logistic模型实证分析表明,认知水平、投资心理、进入城镇的不同方式,以及社会保障对迁移家庭的金融资产参与度有显著影响,认知水平较高的迁移家庭在金融资产选择上更加多元化,家庭决策者的投资心理影响整个家庭对不同风险程度金融资产的选择,社会保障相对健全对迁移家庭而言有较大的推动作用,从而更愿意主动迁移,因此,对金融资产的参与度更高。
From the perspective of design dynamics, this paper carried out a data survey on rural households migrating to urban areas (migrating families for short), and explores the behavioral characteristics of migrating family financial asset selection and the physiological and psychological factors that cause this behavior. The study found that for migrating families there is an unbalanced structure of financial assets and their real estate investment produces some "crowding out effect" on their financial asset selection behavior. Empirical analysis of ordered Logistic model further showed that their cognition level, investment psychology status, different ways of entering towns and cities and the social security all have a significant effect on migrant households’ financial asset participation. The migrating families with higher cognitive levels tend to be more diversified in their choice of financial assets, and family decision makers’ investment attitude influences the whole family in their choice of financial assets with different degrees of risk. Relatively sound social security has strong influence on the migration of families, who are more willing to take the initiative to transfer, therefore, they are more involved in financial assets
舰艇抗冲击试验中爆距定位理论分析与计算
,,唐恒
力学与实践 , 2014, DOI: 10.6052/1000-0879-13-255
Abstract: 在舰艇抗冲击试验中,爆距直接影响到对目标的毁伤效果,爆距的误差范围也直接影响到试验数据的处理,因此,依据爆距的要求,需要对爆源布放沉底后进行准确的定位.准确计算出爆源布放至海底的位置尤为重要.本文对试验中爆源布放后布放索及浮漂在水中的受力情况进行了分析,建立了爆源布放索-浮漂系统受力的数学模型,采用Runge-Kutta方法和Newton迭代法计算出浮漂的漂移量,并给出了具体的算例.
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