食品检测咀嚼机器人灵活性分析与运动仿真

为了解决目前食品检测中检测不准确,反馈速度慢,评价不客观等问题,设计了基于Stewart平台的咀嚼仿生机 器人;介绍了咀嚼仿生机器人的工作原理;推导了机构的雅克比矩阵;分析了机构在中位时的局部灵活性;建立了仿真咀 嚼平台的虚拟样机模型;模拟了下颌简单的张合运动。仿真结果表明驱动杆的各种物理量变化曲线与人类真实咀嚼运 动比较吻合,机构的设计合理可靠。该机构能准确、快速、客观地实现食品的检测。     

基于改进Credit Metrics模型的商业银行信用风险度量及实证研究

信用风险是我国商业银行面临的主要风险.随着美国金融危机的蔓延,各国银行业已意识到加强信用风险监管的必要性.研究信用风险特征,建立合适的度量模型准确地度量我国商业银行的信用风险,是降低信用风险的必然要求,而Credit Metrics模型以其擅长度量非交易性资产的信用风险而著称.作者首先对Credit Metrics模型加以改进,使用我国的信用评级转移矩阵,其次考虑宏观经济和企业本身的非系统性风险,重新调整信用评级转移矩阵.最后以某家银行为基础,使用Credit Met-rics模型进行实证研究,同时对于模型中的部分参数进行修正并对模型加以改进,从而完善CreditMetrics模型在我国商业银行业的应用.     

Spatial effects in dynamic conditional correlations

The recent literature on time series has developed a lot of models for the analysis of the dynamic conditional correlation, involving the same variable observed in different locations; very often, in this framework, the consideration of the spatial interactions is omitted. We propose to extend a time-varying conditional correlation model (following an autoregressive moving average dynamics) to include the spatial effects, with a specification depending on the local spatial interactions. The spatial part is based on a fixed symmetric weight matrix, called Gaussian kernel matrix, but its effect will vary along the time depending on the degree of time correlation in a certain period. We show the theoretical aspects, with the support of simulation experiments, and apply this methodology to two space–time data sets, in a demographic and a financial framework, respectively.     

Consistent Smooth Bootstrap Kernel Intensity Estimation for Inhomogeneous Spatial Poisson Point Processes

Non‐parametric estimation and bootstrap techniques play an important role in many areas of Statistics. In the point process context, kernel intensity estimation has been limited to exploratory analysis because of its inconsistency, and some consistent alternatives have been proposed. Furthermore, most authors have considered kernel intensity estimators with scalar bandwidths, which can be very restrictive. This work focuses on a consistent kernel intensity estimator with unconstrained bandwidth matrix. We propose a smooth bootstrap for inhomogeneous spatial point processes. The consistency of the bootstrap mean integrated squared error (MISE) as an estimator of the MISE of the consistent kernel intensity estimator proves the validity of the resampling procedure. Finally, we propose a plug‐in bandwidth selection procedure based on the bootstrap MISE and compare its performance with several methods currently used through both as a simulation study and an application to the spatial pattern of wildfires registered in Galicia (Spain) during 2006.     

A solvable singular control problem driven by a jump diffusion process with applications

We consider a class of singular control problems driven by a double exponential jump diffusion process, which come from the reversible investment problem. In some interesting cases (e.g., the running cost function is given by the so-called Cobb-Douglas production function), we give the explicit solutions to the singular control problem by using the connection between singular control and optimal switching. We solve a collection of consistent optimal switching problems and yield the explicit solution for the singular control problem. We then give an application to a particular inventory control problem in a single random period.     

设计结构矩阵在新产品开发项目计划中的应用

项目任务之间有顺序、平行和交叉三种关系，大多数网络图方法都侧重解决顺序和平行任务的问题，而忽略了交叉任务的问题。阐述了设计结构矩阵的原理、动态联盟新产品开发项目的特点，明确了在动态联盟新产品开发项目中应用设计结构矩阵的意义，提出了在动态联盟新产品开发项目计划制定中应用设计结构矩阵的方法。此研究有利于增加联盟体整体竞争力、降低新项目的风险、实现规模经济，能实现资源共享、优势互补和防止过度竞争。     

关于线性二次型调节器次最优控制模型和方法的研究

讨论了解决线性二次型调节器系统的次最优方案，目的是要确定一个相对易改进的线性反馈规律，它可导出接近的最优系统指标用这种方法，次最优线性调节器问题被精确公式化，并导出了其解的必要条件     

层次分析法在高校教学质量综合评估中的应用

利用层次分析方法，通过建立层次结构模型、构造成对比较矩阵、计算单排序权向量并进行一致性检验、计算层次总排序权值并进行一致性检验，计算出每所高等院校课程教学质量评估的综合得分而获得高等院校的课程教学质量的综合排序。与一般的统计分析相比，具有良好的系统性和实用性，方法简捷有效，综合效果显著。     

技术意象、社会基质与人的解放——布克钦技术思想解析

布克钦指出技术具有传统的和现代的两种意象，产生技术两种意象的根源在于技术的社会基质。因此，要实现迈向解放的技术、实现人的自由与自然的解放就需要超越技术的传统意象和现代意象，重建社会结构与社会制度并恢复生态感知。布克钦技术思想具有其自洽的理论进路与深刻的实践启示意义，但其在理论上落入了唯心主义，在行动上具有乌托邦色彩。