"包装结构设计"课程教学的实践与探讨

文章讨论了“包装结构设计”课程的特点及传统教学存在的问题,然后在教学内容和教学方法上提出了若干改革建议。     

模具设计课程教学与企业实践中的几点不同之处

依据高职院校模具专业人才培养能力定位，结合模具企业工作岗位能力要求，结合教学与模具企业工作实际，提出了模具设计课程教学中需要增设的内容，希望能对该专业教师及教辅人员有一定启发和帮助，并能达到良好的教学效果与预期的教学目标。     

Designs for estimating the difference between two responses

In this paper the problem of designing experiments for estimating the difference between responses at two arbitrary points in the region of interest is considered. Under the average mean squared error criterion the design moment conditions have been worked out. The results have been applied to the class of central composite designs.     

Balanced and partially balanced incomplete block designs with autocorrelation errors

The paper aims to find variance balanced and variance partially balanced incomplete block designs when observations within blocks are autocorrelated and we call them BIBAC and PBIBAC designs. Orthogonal arrays of type I and type II when used as BIBAC designs have smaller average variance of elementary contrasts of treatment effects compared to the corresponding Balanced Incomplete Block (BIB) designs with homoscedastic, uncorrelated errors. The relative efficiency of BIB designs compared to BIBAC designs depends on the block size k and the autocorrelation ρ and is independent of the number of treatments. Further this relative efficiency increases with increasing k. Partially balanced incomplete block designs with autocorrelated errors are introduced using partially balanced incomplete block designs and orthogonal arrays of type I and type II.     

On the use of partial confounding for the construction of alternative regular two-level blocked fractional factorial designs

In this paper, we consider experimental situations in which a regular fractional factorial design is to be used to study the effects of m two-level factors using n=2^m−k experimental units arranged in 2^p blocks of size 2^m−k−p. In such situations, two-factor interactions are often confounded with blocks and complete information is lost on these two-factor interactions. Here we consider the use of the foldover technique in conjunction with combining designs having different blocking schemes to produce alternative partially confounded blocked fractional factorial designs that have more estimable two-factor interactions or a higher estimation capacity or both than their traditional counterparts.     

Concurrent consideration of product design,process planning and production planning activities

In manufacturing engineering, product design, process planning and production planning activities are often considered independently. However, in order to effectively respond to changes in business situations, such as changes in demand forecast, product mix and technology, it is desirable to consider them concurrently. For this purpose, a large-scale linear programming model has been developed. The model considers minimization of the sum of processing cost, late shipment cost and inventory holding cost as the objective, and concurrently selects product designs, and generates process plans and production plans. The number of columns in the formulation can be large and, hence, an efficient column generation scheme is developed to solve the model. The model and solution procedure are illustrated with examples.     

邓小平“两个大局”的构想与各民族共同繁荣

邓小平"两个大局”对东西部地区各民族共同繁荣发展的构想,继承和发扬了我们党关心和重视西部地区建设,特别是民族地区发展的优良传统,将它纳入"分三步走”,基本实现现代化和最终实现共同富裕的远景目标,也是世纪之交实施西部大开发战略的指导思想.     

试论"两课"教学与学生教育管理的"四个结合"

侧重于理论教育的"两课"教学与侧重于实践教育的学生教育管理如何进行有机结合,以增强德育的实效性,一直是"两课"教学工作者与学生教育管理工作者普遍关心和探讨的问题.解答这一问题的有效答案是实现4个结合,即两课体系与学生教育管理体系相结合;两课教学内容与学生教育管理内容相结合;两课教学法与学生教育管理工作方法相结合;两课教师队伍与学生教育管理工作相结合.     

Inequality for equireplicated n-ary block designs with unequal block sizes

It is shown that certain inequalities known for binary, equireplicated, equiblock-sized block designs remain valid for equireplicated n-ary block designs with unequal block sizes. The approach used here is based on the spectral expansion of the C-matrix of the block design. The main theorems include some useful and combinatorially interesting results.     

Optimal estimation of a finite population mean under generalized random permutation models

Employing certain generalized random permutation models and a general class of linear estimators of a finite population mean, it is shown that many of the conventional estimators are “optimal” in the sense of minimum average mean square error. Simple proofs are provided by using a well-known theorem on UMV estimation. The results also cover certain simple response error situations.