C*-代数上部分矩阵的可逆补     

成波 《安康学院学报》2004,16(4):57-59

给出了有单位元的C*-代数上可逆矩阵的特征,讨论了C*-代数上部分矩阵的可逆补问题,得到C*-代数上部分矩阵(a? cb)有可逆补的条件.  相似文献   

七元素调控宏观经济     

盛平兴  张晨 《商丘师范学院学报》2005,21(2):78-82

经济哲学与宏观经济调控方略在经济发展中的重要性显而易见．回顾经济学流派的各种经济政策展示了调控的显著性，在当今国际经济一体化过程中，宏观经济政策的贫乏越加显现出来．创新是首要任务．以宏观经济指标理论，政策性和阶段性的宏观调控策略．宏观经济良性循环三大任务为综合目标的七元素调控宏观经济的数学模型是三率调控宏观经济的进一步深入和细致，我们分析了税收，存款利率，贷款利率，汇率，货币发行量，国债发行量，财政预算七元素与30个宏观经济指标变量间的经验关系，并由此建立粗略的阶段性的效益矩阵作为决策的基础．利用宏观经济指标对经济的贡献率确定加权系数，并建立线性的目标函数并求出离散组合优化值，为中国宏观经济的发展献一点调控策略。供政府部门的决策者参考．  相似文献   

电磁场中二能级原子的密度矩阵     

高峰  张登玉  唐志祥 《衡阳师范学院学报》2003,24(3):27-29

求解了经典电磁场中二能级原子系统的密度矩阵演化方程，得到了系统状态的演化规律。  相似文献   

体育专业大学生身体成分与心肺功能的相关性研究     

聂环玲  宋光杰  何兴国  韩学良 《河南职业技术师范学院学报》2011,(5):106-108

以身体成分与心肺功能之间的相关性为研究目的,对本单位社会体育专业09级64名男生进行了身体成分、心率及肺活量测试,研究结果表明：各项身体成分同心率之间相关性不显著;体重与肺活量之间呈显著正相关（P〈0.01）,体脂百分比、肌肉百分比同肺活量之间的相关性不显著;体重、体脂百分比与肺活量体重指数之间呈极显著负相关（P〈0.01）,肌肉百分比与肺活量体重指数之间呈极显著正相关（P〈0.01）.  相似文献   

一元线性回归系数比值不确定度的评定     

罗颖 《赣南师范学院学报》2011,32(6):92-95

分析一元线性回归系数的相关性,导出一元线性回归系数比值不确定度的计算公式,指出了某些文献中有关回归系数比值不确定度评定存在的问题.  相似文献   

基于分子结构矩阵的醇类化合物色谱保留指数的预测   总被引：1，自引：1，他引：0  

刘新华 《德州学院学报》2011,27(4):40-46

根据分子结构创建了分子结构矩阵,将分子结构矩阵的行数、列数以及其向量的一范数的算术平方根为分子的结构信息指数,并将多元统计学中的因子分析方法引入QSPR/QSAR研究中,以优化的变量因子为自变量,预测了25种醇类化合物的色谱保留指数,结果令人满意.  相似文献   

Emerging Educational Institutional Decision-Making Matrix     

Kevin H. Ashford-Rowe Marnie Holt 《美中教育评论》2011,(3):317-322

The ＂emerging educational institutional decision-making matrix＂ is developed to allow educational institutions to adopt a rigorous and consistent methodology of determining which of the myriad of emerging educational technologies will be the most compelling for the institution, particularly ensuring that it is the educational or pedagogical but not the technological imperative that drives the technology integration agenda. The matrix is designed to be used after some initial research into an emerging technology. Once a technology is put through the matrix, a member of options are available： （1） shelving the technology; （2） putting the technology on hold and maintaining a watching brief until the technology matures in the market; and （3） researching the product further by conducting a trial or placing in testing sandpit. After further research, the technology can be tested as a pilot to determine how well or otherwise, the technology works within the institution. If an emerging technology has more than one product associated with it, a second and third step in the matrix has been developed, and the second step assigns a rating to each of the categories within the matrix. With many products containing similar features, a third step has been developed to compare products on a feature level.  相似文献   

次强Hermiter矩阵及其性质     

刘玉  吴萍萍 《韩山师范学院学报》2011,32(3):1-5

在次Hermiter矩阵定义的基础上给出了次强Hermiter矩阵的概念,利用次Hermiter矩阵的研究方法及性质,推出了次强Hermiter矩阵的一些性质．  相似文献   

FARMER: A novel approach to file access correlation mining and evaluation reference model     

夏鹏  冯丹  王芳 《上海大学学报(英文版)》2011,15(6):574-588

File semantic has proven effective in optimizing large scale distributed file system. As a consequence of the elaborate and rich I/O interfaces between upper layer applications and file systems, file system can provide useful and insightful information about semantic. Hence, file semantic mining has become an increasingly important practice in both engineering and research community. Unfortunately, it is a challenge to exploit file semantic knowledge because a variety of factors could affect this information exploration process. Even worse, the challenges are exacerbated due to the intricate interdependency between these factors, and make it difficult to fully exploit the potentially important correlation among various semantic knowledges. This article proposes a file access correlation miming and evaluation reference (FARMER) model, where file is treated as a multivariate vector space, and each item within the vector corresponds a separate factor of the given file. The selection of factor depends on the application, examples of factors are file path, creator and executing program. If one particular factor occurs in both files, its value is non-zero. It is clear that the extent of inter-file relationships can be measured based on the likeness of their factor values in the semantic vectors. Benefit from this model, FARMER represents files as structured vectors of identifiers, and basic vector operations can be leveraged to quantify file correlation between two file vectors. FARMER model leverages linear regression model to estimate the strength of the relationship between file correlation and a set of influencing factors so that the “bad knowledge” can be filtered out. To demonstrate the ability of new FARMER model, FARMER is incorporated into a real large-scale object-based storage system as a case study to dynamically infer file correlations. In addition FARMER-enabled optimize service for metadata prefetching algorithm and object data layout algorithm is implemented. Experimental results show that is FARMER-enabled prefetching algorithm is shown to reduce the metadata operations latency by approximately 30%–40% when compared to a state-of-the-art metadata prefetching algorithm and a commonly used replacement policy.  相似文献   

Searching high gray scale FPD scanning matrix based on PSO     

严利民  王念  田锋 《上海大学学报(英文版)》2011,15(3):207-211

With the increase of gray scale and flat panel display (FPD) size, subspace bitwise scanning strategy can be replaced traditional scanning method to cut down frame frequency. However, the direct searching strategy (DSS) becomes unfeasible to obtain corresponding high gray scale scanning matrix. Thus, particle swarm optimization (PSO) is introduced to accelerate searching for high gray scale weights scanning matrix (WSM) with its parallelism and global optimization feature. Finally a WSM of 256 gray scales is found out successfully with Matlab, which both gray linearity and scanning efficiency are satisfied.  相似文献