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141.
Oscar De la Torre Torres Mª Isabel Martínez Torre Enciso 《Contaduría y Administración》2017,62(1):222-238
The present paper continues the firsts reviews made to socially responsible investment in Mexico. We extended these reviews by using a non-parametric multivariate equality test, along with a multi-factor market cap model, and a Monte Carlo simulation. Our results show that the IPCS index, the IPCcomp and the IPC have a statistically equal mean-variance performance, suggesting that this sort of investment style (SRI) is a good substitute of the broad market investment style in the long term. Among the causes of this finding is the fact that the IPCS and the IPCcomp indexes have almost the same large and small cap stock concentration and the IPC index (a large-cap one) is not as diversified and mean-variance efficient as the former. 相似文献
142.
在单标的资产价格随机模型的基础上,推导了具相关性的多标的资产价格的随机过程公式,以此构造蒙特卡罗模拟高维欧式期权定价的随机模型,给出模拟算法,并分析了影响蒙特卡罗模拟效果的几个关键因素。模拟算例的结果显示模拟效果较好。 相似文献
143.
[目的]预测2017—2035年诸城市农业结构的变化趋势,对农业结构进行多情景优化仿真,提出优化调整建议。[方法]文章以山东省诸城市作为研究对象,将农业结构划分为种植、种养结合和加工休闲3个子系统,选取56个指标,运用多元统计回归分析等方法构建41个方程,建立农业结构系统动力学(System Dynamics,简称SD)模型,运用Vensim—PLE软件进行仿真优化分析。[结果]SD模型预测结果表明,到2035年,粮食作物播种面积1105万hm2,总产量8037万t,经济作物播种面积652万hm2,总产量15203万t; 生猪出栏量达到29615万头,家禽出栏量1105 231亿只,畜禽粪污利用率8792%; 农业总产值达到25132亿元,休闲农业产值6134亿元,食品加工业产值1 25263亿元。假设种植业生产中的农业科技投入增加2个百分点, 2035年粮食作物产量较优化前增加576万t; 经济作物产量较优化前增加2814万t; 假设有机肥施用补贴增加3个百分点, 2035年畜禽粪污利用率较优化前提高762个百分点; 假设农产品加工业的研发力度和科技投入增加1个百分点, 2035年食品加工产值较优化前增加73521亿元; 农产品加工业产值占农业总产值比值由优化前的325:1达到41:1。[结论]为进一步推进诸城市农业结构调整,迫切需要加大农业科技投入,完善有机肥扶持政策,培育种养结合新型经营主体,重点扶持培育加工龙头企业,发展现代化休闲农场,促进农业产业融合发展。 相似文献
144.
复合实物期权研究述评 总被引:1,自引:0,他引:1
综述了国内外复合期权理论、方法及应用的最新研究成果,介绍了复合期权模型在金融资产和实物资产价值评估、公司金融领域等的具体应用。对多期复合期权模型在序列决策方面所具有的优势与应用前景、研究难点及相应的解决方案展开了深入的讨论。 相似文献
145.
马玲 《石油工业技术监督》2005,21(9):12-14
介绍了燃料乙醇仿真系统软、硬件的结构,着重阐明了它的设计思想和技术特色;标准、适用、灵活是该系统的最重要的特点;实现了全流程的仿真;该系统既可用于培训,还可用于运行指导. 相似文献
146.
147.
Michael Shayne Gary 《战略管理杂志》2005,26(7):643-664
Strategy research has a long‐standing interest in the performance consequences of corporate diversification. In theory, resource sharing should yield economic benefits in related multi‐business firms, but the extensive empirical research remains equivocal. To explore this paradox, this paper examines the process of implementing a related diversification strategy. Working from existing theory, a formal model is constructed that describes the process and performance implications of a related diversification move. The model is analyzed using computer simulation, and the analysis suggests that successful diversification strategies require managerial policies that maintain organization slack. In the absence of such policies, related diversification can negatively impact firm performance even when substantial synergy opportunities exist. The analysis also demonstrates, contrary to existing theory, that diversification strategies based on a very high degree of relatedness can lead to lower performance than less related strategies in some circumstances. Counter‐intuitively, extracting potential synergies may require additional investment in shared resources. Copyright © 2005 John Wiley & Sons, Ltd. 相似文献
148.
We study a longitudinal fit model of adaptation and its association with the longitudinal risk‐return relationship. The model allows the firm to adjust its position in response to partial learning about a changing environment characterized by two path‐dependent processes—a random walk and a stochastic trend. Computational simulations at low levels of learning in both environmental contexts are consistent with empirical data. However, the results are also consistent when firm behavior appears to be mindless in the form of a random walk. Hence, both imperfect learning and a mindless random walk can lead to the inverse longitudinal risk‐return relationships observed empirically. We discuss this apparent paradox and the possible resolution between mindless and conscious behavior as plausible causes of the longitudinal Bowman Paradox. Copyright © 2014 John Wiley & Sons, Ltd. 相似文献
149.
Technology‐push,market‐demand and the missing safety‐pull: a case study of American Airlines Flight 587 下载免费PDF全文
Amy L. Fraher 《New Technology, Work and Employment》2015,30(2):109-127
Through a critical case study of the crash of American Airlines Flight 587, this paper draws upon ‘the Social Shaping of Technology’ (SST) approach to offer a reconceptualisation of the technology‐push and market‐demand model for High‐Reliably Organisations (HROs), providing support for a third factor, called here a ‘safety‐pull’. A safety‐pull is defined as organisationally supported reflexivity in which technology innovators and frontline operators collaborate to consider the potential implications of adopting new technologies in HROs and the complex ways this change may impact human operators' work performance, often in risky and unanticipated ways. In contrast to accidents occurring solely as the result of individual operator error, analysing the safety‐pull provides a way to tease out the wide range of factors that can contribute to HRO failures and offers a new SST perspective through which to examine high‐risk operations. 相似文献
150.
房地产开发企业违约概率压力测试研究——现金流蒙特卡洛模拟方法在银行中的应用 总被引:1,自引:0,他引:1
本文采用蒙特卡洛模拟方法,根据现金净额是否为负这一标准来判断房地产开发企业是否违约,在对企业的现金流进行随机模拟的基础上来计算企业的违约概率。压力测试的场景为房价下降,利率上升。压力传导途径为房价与利率变动导致企业销售收入变动,销售收入的改变导致企业的现金流量表发生变化。房价和利率对销售收入的冲击是随机的,企业的现金流也是随机的,本文通过随机模拟估算了企业的现金流为负的频率,以此作为企业违约的概率。压力测试表明,当房价下降幅度到达15%附近时,房地产开发商的违约概率开始急剧上升。 相似文献