平面图形周长和面积测量仪原理的理论推导

研究了一种简单机械结构的周长和面积测量仪原理,并对其做了理论推导。其测量采用变换器原理,从而使得测量方法变得简捷,简单的数据记录方法精确、实用、有效。该理论推导为其实际运用打下理论基础。     

抓紧结构调整振兴广西装备制造业

阐述广西机械工业结构调整的必要性,并提出了相应的任务和对策.     

Hemispheric asymmetries for global and local visual perception: Effects of stimulus and task factors.

Although neurological and physiological studies indicate a right hemisphere superiority in global processing and a left hemisphere superiority in local processing of Navon-type hierarchical letters (D. Navon, 1977), most investigations of lateralized perception in healthy participants report neither asymmetry. In 6 experiments the authors examined the influence of attentional demands, stimulus properties, and mode of response on perceptual asymmetries for global and local perception. Consistent with their theoretical predictions, asymmetries were more robust on divided- than focused-attention tasks and in response to stimuli in which local and global levels were equally salient compared with those with greater global than local saliency. Contrary to their prediction, perceptual asymmetries were not influenced by the complexity of the motor response. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

并行设计耦合任务集的识别方法

并行设计中强调多种知识的有效集成，耦合任务是一组具有相互依赖关系的任务的集合，它正反映了这种知识集成的要求，它对设计时间和质量均有着关键的影响。通过对耦合任务集的识别可以为合理分配设计资源、在效规划设计过程、科学组建集成开发队伍提供参考。本文在建立设计过程图的基础上提出了识别耦合任务集的有效方法。     

Accelerating EM for Large Databases

The EM algorithm is a popular method for parameter estimation in a variety of problems involving missing data. However, the EM algorithm often requires significant computational resources and has been dismissed as impractical for large databases. We present two approaches that significantly reduce the computational cost of applying the EM algorithm to databases with a large number of cases, including databases with large dimensionality. Both approaches are based on partial E-steps for which we can use the results of Neal and Hinton (In Jordan, M. (Ed.), Learning in Graphical Models, pp. 355–371. The Netherlands: Kluwer Academic Publishers) to obtain the standard convergence guarantees of EM. The first approach is a version of the incremental EM algorithm, described in Neal and Hinton (1998), which cycles through data cases in blocks. The number of cases in each block dramatically effects the efficiency of the algorithm. We provide amethod for selecting a near optimal block size. The second approach, which we call lazy EM, will, at scheduled iterations, evaluate the significance of each data case and then proceed for several iterations actively using only the significant cases. We demonstrate that both methods can significantly reduce computational costs through their application to high-dimensional real-world and synthetic mixture modeling problems for large databases.     

最晚截止期优先带宽转让算法

基于最早截止期优先调度的实时系统，针对有新任务插入(与/或)现行任务加速但系统带宽不足的问题，提出一种最晚截止期优先(LDF)算法，用于系统在运行时选择现行任务转让带宽。采用从最晚作业截止期任务开始判断的方法，经过尽可能少的比较次数，找到合适的受压任务，平滑地完成带宽转让。算法需要的最多比较次数为2n。仿真结果表明，该算法在大多情况下只需要比较1~2次即可完成压缩任务。     

Development of task analysis method for operator tasks in main control room of an advanced nuclear power plant

Task analysis methods provide an insight for quantitative and qualitative predictions of how people will use a proposed system, though the different versions have different emphases. Most of the methods can attest to the coverage of the functionality of a system and all provide estimates of task performance time. However, most of the tasks that operators deal with in a digital work environment in the main control room of an advanced nuclear power plant require high mental activity. Such mental tasks overlap and must be dealt with at the same time; most of them can be assumed to be highly parallel in nature. Therefore, the primary aim to be addressed in this paper was to develop a method that adopts CPM-GOMS (cognitive perceptual motor-goals operators methods selection rules) as the basic pattern of mental task analysis for the advanced main control room. A within-subjects experiment design was used to examine the validity of the modified CPM-GOMS. Thirty participants participated in two task types, which included high- and low-compatibility types. The results indicated that the performance was significantly higher on the high-compatibility task type than on the low-compatibility task type; that is, the modified CPM-GOMS could distinguish the difference between high- and low-compatibility mental tasks.     

Intraindividual variability is related to cognitive change in older adults: Evidence for within-person coupling.

In this study, the authors addressed the longitudinal nature of intraindividual variability over 3 years. A sample of 304 community-dwelling older adults, initially between the ages of 64 and 92 years, completed 4 waves of annual testing on a battery of accuracy- and latency-based tests covering a wide range of cognitive complexity. Increases in response-time inconsistency on moderately and highly complex tasks were associated with increasing age, but there were significant individual differences in change across the entire sample. The time-varying covariation between cognition and inconsistency was significant across the 1-year intervals and remained stable across both time and age. On occasions when intraindividual variability was high, participants' cognitive performance was correspondingly low. The strength of the coupling relationship was greater for more fluid cognitive domains such as memory, reasoning, and processing speed than for more crystallized domains such as verbal ability. Variability based on moderately and highly complex tasks provided the strongest prediction. These results suggest that intraindividual variability is highly sensitive to even subtle changes in cognitive ability. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

焦炉操作全自动模型的开发与应用

在焦化企业中焦炉的推焦车、拦焦车、加煤车、熄焦车按生产计划执行导焦、推焦、接焦和加煤等任务。在 保证班计划能正确生成、下达的情况下将这些任务进行顺序控制可自动执行班计划，最终实现焦炉的自动化操作。 全自动控制系统对降低工人劳动强度、提高生产效率、简化操作流程、确保安全生产等有重要的意义。主要介绍了 焦炉全自动操作系统的开发以及在梅钢新焦炉系统中的应用。