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价格异常与不对称相关结构下套期保值策略——来自亚洲股指期货市场的实证 被引量:3
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作者 郑尊信 《证券市场导报》 CSSCI 北大核心 2010年第4期22-29,77,共9页
在不对称相关结构下,尾部区域期货和现货价格联动模式异常复杂,传统套期保值策略在极端价格行为下将不可避免地出现系统性偏差。为此,恰当的连接函数被引入描述尾部区域的价格联动模式,依据MV框架构建局部套期保值策略,以解决极端价格... 在不对称相关结构下,尾部区域期货和现货价格联动模式异常复杂,传统套期保值策略在极端价格行为下将不可避免地出现系统性偏差。为此,恰当的连接函数被引入描述尾部区域的价格联动模式,依据MV框架构建局部套期保值策略,以解决极端价格行为下的套期保值问题。对亚洲市场日经指数和恒生指数期货套期保值的实证研究表明:(1)采用Rotated Gumbel连接函数,在传统MV策略(全局策略)下,虽然在降低套保组合方差方面没有明显优势,但日经指数和恒生指数期货的套期保值成本将显著下降,套保组合收益/组合方差的比率显著上升;(2)如果套期保值者能够对未来形成可靠预期,套期保值的成本将进一步下降,并且现货价格风险也得到有效控制。 展开更多
关键词 极端价格 预期 不对称相关 局部套期保值
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基于CNFET电路段内关键门的全局布局算法
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作者 田康林 赵康 《计算机辅助设计与图形学学报》 EI CSCD 北大核心 2024年第3期464-472,共9页
针对传统硅基电路布局算法在碳纳米管(CNT)密度变化的碳纳米管场效应晶体管(CNFET)电路上表现出时序良率不高的问题,提出一种基于段内关键门的全局布局算法.首先自底向上逐级分析电路各个层级,依次建立门延迟、门树延迟模型,在此基础上... 针对传统硅基电路布局算法在碳纳米管(CNT)密度变化的碳纳米管场效应晶体管(CNFET)电路上表现出时序良率不高的问题,提出一种基于段内关键门的全局布局算法.首先自底向上逐级分析电路各个层级,依次建立门延迟、门树延迟模型,在此基础上结合CNFET电路相关矩阵建立包含延迟均值和方差的段统计延迟模型;然后通过理论分析确定时序良率与段的统计延迟之间的相关关系;最后利用CNFET电路不对称空间相关性,使用网格搜索策略不断迭代调整段内关键门位置,以降低段延迟.在OpenCores中4个测试电路上的实验结果表明,所提算法平均提高了20%的电路时序良率,在执行时间上比CNT密度变化感知的基准方法降低25%,揭示了其在高时序良率要求的大规模电路中应用的潜力. 展开更多
关键词 碳纳米管 碳纳米管场效应晶体管 不对称空间相关 全局布局算法
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氨基酸嗜盐不对称指数与其理化性质的相关性
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作者 张光亚 《计算机与应用化学》 CAS CSCD 北大核心 2012年第5期545-548,共4页
了解嗜盐蛋白氨基酸使用的偏好及该偏好与其理化性质之间的联系对探索嗜盐蛋白构效关系具有重要意义。本文选取极端嗜盐细菌Salinibacter ruber和非嗜盐菌Pelodictyon luteolum中362对同源蛋白,统计了52102个氨基酸突变位点,以此计算氨... 了解嗜盐蛋白氨基酸使用的偏好及该偏好与其理化性质之间的联系对探索嗜盐蛋白构效关系具有重要意义。本文选取极端嗜盐细菌Salinibacter ruber和非嗜盐菌Pelodictyon luteolum中362对同源蛋白,统计了52102个氨基酸突变位点,以此计算氨基酸的嗜盐不对称指数(HAI),并与243个理化性质进行相关性分析。结果表明:天冬氨酸的嗜盐性能最强,而异亮氨酸和赖氨酸最弱;243个理化性质中有16个同HAI存在显著相关性,其中5个呈正相关;氨基酸的亲疏水性及β折叠的倾向性是影响HAI值的两种最重要的理化性质。本文提出的氨基酸嗜盐不对称指数为了解嗜盐蛋白稳定性机制提供了新视角。 展开更多
关键词 嗜盐蛋白 Β折叠 氨基酸亲疏水性 嗜盐不对称指数 相关性分析
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The Influence of Government Regulation on Audit Quality
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作者 QIN Yuan WANG Min 《International English Education Research》 2015年第12期29-30,共2页
"Independent Audit basic norms" pointed out independent audit is the CPA entrusted by law, to be conduct an independent review of the accounting statements and related information and issue the audit opinion." In t... "Independent Audit basic norms" pointed out independent audit is the CPA entrusted by law, to be conduct an independent review of the accounting statements and related information and issue the audit opinion." In the stock market, an independent audit is an important means to achieve fair presentation of financial statements by SFC-authorized accounting firm to conduct an independent audit of listed companies. In the open accounting services market, the independent audit is the most occupied audit resources, the most important business, and therefore the business is also subject to severe supervision of the SFC. Its value lies in perform forensic of the financial statements information of listed companies, and the higher the quality, the more it can reduce the risk of material misstatement of the financial statements, which is the need to strengthen and improve audit quality. Our independent audit market originated in the 1980s, along with the reform and opening up, China's economy is experiencing rapid growth, the demand for high quality audit increasingly enhanced. Audit activities have the nature of external and information asymmetry. External audit refers to it have an impact to investors, government departments and the other public stakeholders. Information asymmetry refers to the information asymmetry between the auditor and the audited entity, but due to the presence of asymmetric information and other reasons, the interests of stakeholders will be hurt by false information Government regulation as a model audit industry control, either in foreign or domestic, have played an irreplaceable role, especially in the socialism of China, plays a leading role. For example, when Enron bankruptcy United States speedly issue SOX in 2002 to strengthen the role of government regulation, effectively preventing the conspiracy of the CPA and the audited entity and improve audit quality. Visiblely, the role of government regulation in the audit market is very important. 展开更多
关键词 government regulation audit quality regulatory authorities
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Generalized Coherent States for Position-Dependent Effective Mass Systems
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作者 Naila Amir Shahid Iqbal 《Communications in Theoretical Physics》 SCIE CAS CSCD 2016年第12期615-620,共6页
A generalized scheme for the construction of coherent states in the context of position-dependent effective mass systems has been presented. This formalism is based on the ladder operators and associated algebra of th... A generalized scheme for the construction of coherent states in the context of position-dependent effective mass systems has been presented. This formalism is based on the ladder operators and associated algebra of the system which are obtained using the concepts of supersymmetric quantum mechanics and the property of shape invariance. In order to exemplify the general results and to analyze the properties of the coherent states, several examples have been considered. 展开更多
关键词 generalized coherent states supersymmetric quantum mechanics shape invariance ladder operators position-dependent effective mass systems non-linear oscillators Mandel parameter subPoissonian statistics
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