浅谈反映人体测量学来源的人体比例理论

人体测量学并不是现代社会的产物。有着很长发展历史的人体比例理论中就包含了现代人体测量学的基本内容,尽管其还不够系统完整,但至少说明了在艺术创作中诞生的人体比例理论对现代人体测量学的影响。并随着时间的推移而不断的完善发展,为现代人体测量学的系统提出奠定了坚实的基础。     

表征绕组特征的参数与绕组变形关系的仿真

为了提升变压器绕组变形判别精度,研究了表征绕组特征的参数与绕组变形关系的仿真方法.利用有限元方法建立表征绕组特征的参数与绕组变形关系的双绕组、同芯式变压器漏磁场模型,通过二维泊松方程混合边值的有限元解分析变压器绕组漏磁场,利用最小二乘算法基于所建立变压器漏磁场模型辨识可表征绕组特征的漏电感参数,通过所获取漏电感值与实际...     

垂线偏差对空中对准航向误差的影响研究

针对性分析了垂线偏差变化对空中对准航向精度的影响.首先给出了常用空中对准降阶滤波模型,分析了垂线偏差变化影响空中对准航向误差的机理.然后通过实测离线数据测试验证了垂线偏差对空中对准航向误差的影响.最后通过误差协方差分析方法仿真了降阶滤波模型在真实世界中的滤波性能.离线测试及仿真结果表明:在给定条件下垂线偏差变化率对航向误差的影响相对其他未建模惯性测量组件误差是主要的,对航向对准误差影响较大,可达0.15°.在中高精度应用中为保证在不同空域内空中对准航向精度考虑采用高精度重力场模型对垂线偏差进行补偿是必要的.     

Computer-integrated manufacturing as the basis for the factory of the future

Today, throughout the world, manufacturing is being subjected to major economic and social pressures which can only be satisfied through major advances in manufacturing productivity and quality. Fortunately, there are also strong technological resources emerging today which have the potential to provide such major advances. These resources derive from the technology which is becoming known as computer-integrated manufacturing (CIM). The technology, taken together with today's long-term economic and social pressures, is clearly shaping the factory of the future. In this paper, the nature and potential of CIM is first defined. It is then evaluated by combining the results of a survey of the CIRP Scientific Technical Committee on Optimization members' estimates with information derived both from recent literature and from the author's personal observations of the development of CIM throughout the world. The resulting appraisal reveals that, although implementation of CIM is still in its infancy, even at this early stage tremendous economic benefits are being reaped from implementation of this technology. In addition, its potential for further benefit, both economic and social, is very large indeed.     

基于小波包分解的图像清晰度判定

针对微操作机器人在视觉伺服过程中图像清晰度判定问题，提出了基于小波包分解的图像清晰度判定方法。介绍了微操作显微视觉系统的特点，构造了基于小波包重构信号能量的图像清晰度判定特征向量．并建立了线性图像清晰度分类器。采用Fisher准则确定分类器的权向量和分界点阈值。实验数据验证了该分类器的有效性。     

On the numerical solution of the stokes equations using the finite element method

A numerical solution of the stationary Stokes equations is considered based on the work of Crouzeix and Raviart [1]. The finite element method is used to discretize the partial differential equations, and a direct discretization of the velocity field and pressure is given which is applicable in both two and three dimensions. It is shown that not every arbitrary element can be used, and a condition is given to check whether or not an element is admissible. The system of linear equations is solved using the method of Powell and Hestenes for constrained optimization (see [2]).     

On the computation of the exponential integral

A simple high-accuracy algorithm for calculating the exponential integral is developed. The exponential integral is represented in the form of a convergent series when x is small and in the form of an asymptotically convergent continued fraction when x is large. It is shown that the optimal boundary between these representations is x = 1. The use of 18 series terms and 220 continued fraction terms guarantees that the relative error is smaller than 2 × 10^?15, which exceeds what is needed in practice.     

On the monotonic convergence of the eigensolution by the h-version of the finite element method

The convergence of the strain energy of solutions by the finite element method (FEM) for static problems has been extensively investigated. It has been proven that for exactly and minimally conforming hierarchical elements, convergence is monotonic as the number of degrees of freedom (NDOF) are increased by both the h- and p-versions.An investigation of the convergence of the eigensolution for dynamic problems by the h-version is presented. In general, an increase in the NDOF does not result in an improvement in the eigensolution. A condition for refinement is given under which monotonic convergence and improvement is ensured.     

Between the crystalline and the chaotic

This short feature documents elements of research in advance of a long-term work. Rather than a technical account or retrospective, the aim is to demonstrate by example how research itself is a primary process, illustrated by work carried out at the Institute of Creative Technologies (IOCT) during the last few years. When creative output is appraised only from its visible results, something is lost in the telling; carefully selected public facets rarely convey the depths of the underlying lines of inquiry. The research covered is for a work that generates quantitative data, driving visualisations of human movement, proximity and orientation. The aim is to reveal how these literal data reflect our relationships to one another in social settings. To contextualise the current process, complex systems, dynamic pattern formation and other works are also mentioned. As a personal account, it seemed appropriate to supplement the usual academic passive voice with first-person narrative.     

概念格在查询课程的系统中的应用

概念格是数据分析理论中的一种有力工具。针对查询课程系统这类问题,利用概念间的相似度构造加权的概念格．从而给出一种方法来解决查询过程中关键词的输入顺序问题,并结合实例说明了这种方法的有效性。     

On the relation of the quality of the system with the configuration of the structure of its control device

By examples of the design in the input-output relations of control devices with various configurations, the dependence on the configuration of the value of the criteria characterizing the system quality is shown. The complexity of solving the problem in the state space is illustrated.     

概念格在查询课程的系统中的应用

概念格是数据分析理论中的一种有力工具。针对查询课程系统这类问题,利用概念间的相似度构造加权的概念格,从而给出一种方法来解决查询过程中关键词的输入顺序问题,并结合实例说明了这种方法的有效性。     

Criterion for the convergence of the solution of the Riccati differential equation

The optimal control problem for a linear system with a quadratic cost function leads to the matrix Riccati differential equation. The convergence of the solution of this equation for increasing time interval is investigated as a function of the final state penalty matrix. A necessary and sufficient condition for convergence is derived for stabilizable systems, even if the output in the cost function is not detectable. An algorithm is developed to determine the limiting value of the solution, which is one of the symmetric positive semidefinite solutions of the algebraic Riccati equation. Examples for convergence and nonconvergence are given. A discussion is also included of the convergence properties of the solution of the Riccati differential equation to any real symmetric (not necessarily positive semidefinite) solution of the algebraic Riccati equation.     

城区大型医院门诊大厅扩建空间利用优化

健康服务质量和生活水平的提高,使人们对医疗健康保障的标准和需求不断增加,在医院经常出现排队现象.为提高医院服务质量和患者的满意度,需对医院门诊大厅扩建空间进行优化.针对当前医院门诊大厅扩建空间利用优化方法存在的排队时间长、设施覆盖率低问题,提出新的城区大型医院门诊大厅扩建空间利用优化方法.通过单服务台和多服务台等待排队...     

浅谈紫禁城的屋顶文化

紫禁城是我国古代建筑的精品,显示着古代匠师们在建筑上的卓越成就。其苦心经营的屋顶建构更是彰显了宫殿壮丽的威严和飞动的气势。随着我国城市化建设的加速发展,正确地认识中国传统建筑文化并设计具有中国文化的建筑迫在眉睫。本文将从紫荆城屋顶的造型和色彩两方面探析紫禁城的屋顶文化。     

卡尔曼滤波在陀螺仪随机漂移中的应用

本文针对MIMU中微机械陀螺的静态随机漂移,采用时间序列分析的方法建立了其随机漂移误差的AR模型,并在此基础上,探讨了利用Kalman滤波降低该随机噪声的具体方法.对实测数据的仿真结果表明,本文所介绍的滤波方法是正确、有效的。     

复形法在永磁式力矩器设计中的应用

采用复形法对测量角位移及角速度用的挠性陀螺仪的永磁式力矩器进行了优化设计，有效地提高了该陀螺仪的跟踪速度。     

Using the theory of the professions to understand the IS identity crisis

Academic information systems (IS) is struggling with an identity crisis that is grounded in limited consensus about the discipline's core concepts, its important research questions and its boundaries. The result is a pluralistic discipline that has triggered an ongoing debate about whether the ‘liquidity’ characteristic of IS is a natural consequence of rapidly changing technologies or if it is indicative of a chaotic state that is unsustainable. This paper looks at IS through a new and different lens by using the theory of the professions to gain insight into current and heretofore unidentified problems facing the discipline. Casting IS as a profession presents an integrated view of academic IS, IS practice and IS education grounded in a framework that explores connections among these three elements. The paper concludes with a discussion of the processes by which professions evolve and likely consequences for IS research, practice and education.     

Bridging the gap between the IS organization and the rest of the business: plotting a route

Abstract. Much of the research literature advocates a strong information system (IS) organization-business relationship if the IS organization and, in particular, technology is to make a value-added contribution to the business. Although research also highlights that in many organizations this relationship is poor, little guidance is provided as to how this 'gap' might be bridged. The research reported in this paper is a longitudinal study of three organizations that are actively seeking to bridge the gap, improve the relationship and consequently the value that they derive from their IS investments. A process model containing six stages, illustrating the route to creating high performance from IS, is constructed from cross-case analysis of the collected data. The paper ends with conclusions and implications.     

On the definition of the intuitionistic fuzzy subgroups

In this paper, a new kind of intuitionistic fuzzy subgroup theory, which is different from that of Ma, Zhan and Davvaz (2008) [22], [23], is presented. First, based on the concept of cut sets on intuitionistic fuzzy sets, we establish the neighborhood relations between a fuzzy point $x_a$ and an intuitionistic fuzzy set $A$. Then we give the definitions of the grades of $x_a$ belonging to $A$, $x_a$ quasi-coincident with $A$, $x_a$ belonging to and quasi-coincident with $A$ and $x_a$ belonging to or quasi-coincident with $A$, respectively. Second, by applying the 3-valued Lukasiewicz implication, we give the definition of $(\alpha ,\beta )$-intuitionistic fuzzy subgroups of a group $G$ for $\alpha ,\beta \in \{\in ,q,\in \wedge q,\in \vee q\}$, and we show that, in 16 kinds of $(\alpha ,\beta )$-intuitionistic fuzzy subgroups, the significant ones are the $(\in ,\in )$-intuitionistic fuzzy subgroup, the $(\in ,\in \vee q)$-intuitionistic fuzzy subgroup and the $(\in \wedge q,\in )$-intuitionistic fuzzy subgroup. We also show that $A$ is a $(\in ,\in )$-intuitionistic fuzzy subgroup of $G$ if and only if, for any $a\in (0,1]$, the cut set $A_a$ of $A$ is a 3-valued fuzzy subgroup of $G$, and $A$ is a $(\in ,\in \vee q)$-intuitionistic fuzzy subgroup (or $(\in ,\in \vee q)$-intuitionistic fuzzy subgroup) of $G$ if and only if, for any $a\in (0,0.5]$(or for any $a\in (0.5,1]$), the cut set $A_a$ of $A$ is a 3-valued fuzzy subgroup of $G$. At last, we generalize the $(\in ,\in )$-intuitionistic fuzzy subgroup, $(\in ,\in \vee q)$-intuitionistic fuzzy subgroup and $(\in \wedge q,\in )$-intuitionistic fuzzy subgroup to intuitionistic fuzzy subgroups with thresholds, i.e., $(s,t]$-intuitionistic fuzzy subgroups. We show that $A$ is a $(s,t]$-intuitionistic fuzzy subgroup of $G$ if and only if, for any $a\in (s,t]$, the cut set $A_a$ of $A$ is a 3-valued fuzzy subgroup of $G$. We also characterize the $(s,t]$-intuitionistic fuzzy subgroup by the neighborhood relations between a fuzzy point $x_a$ and an intuitionistic fuzzy set $A$.