成人高等教育毕业设计存在的主要问题及应对措施

毕业设计是本科教育的一个重要环节,也是成教毕业生获得毕业资格和学位资格的重要依据。文章分析了成人高等教育毕业设计中存在的主要问题和原因,同时提出了解决方法。     

A proposed methodology for the prediction of mental workload, based on engineering system parameters

In the design of engineering systems, mental workload is one of the most important factors in the allocation of cognitive tasks. Current methods of task allocation have criteria that are defined in only general terms and are thus not very useful in aiding detailed decision-making in system design. Whilst there are many quantitative criteria available to determine the physical space in human-machine interaction, system designers really require an explicit model and specific criteria for the following identification of the mental workload imposed by the system; prediction of both human and system performance; evaluation of the alternatives of system design; and the design of system components. It is argued that the available methods of workload or performance are either too domain-dependent to apply to the design of other systems, or subject-dependent and thus do not reflect the objective workload imposed by the system. The presented research adopts a new approach to cognitive task analysis in dynamic decision-making systems. Based on the characteristics derived from task analysis, a general conceptual model of the prediction of mental workload in system design is proposed. In the new model, workload is represented by a set of system parameters—task arrival rate, task complexity, task uncertainty, and performance requirements—which are considered to be the main sources of workload. In this context, workload becomes an objective demand of engineering systems, independent of any subjective factors. Whether an individual or population is overloaded depends upon their workload threshold with respect to the specified task and environment. It is hoped that this new model, after both laboratory and industrial validation, could be used by system designers to predict the workload imposed on people by systems.     

ESTIMATION OF DISCRETE CHOICE MODELS WITH MINIMAL VARIATION OF ALTERNATIVE-SPECIFIC VARIABLES

The paper states conditions for minimal variation within the explanatory variables such that the maximum likelihood estimate of the coefficient vector in the discrete choice logit model is unique. Special emphasis is given to the case that (almost) all individuals observe the same set of alternative-specific explanatory variables. The aspect of 'experimental design' in discrete choice models is discussed.     

问题教学法在技术理论课教学中的应用

本文通过对问题教学法在体育院系技术理论课教学中的实验研究，阐明了问题教学法在技术理论课教学中的重要作用，论证了问题教学法作为一种教学手段用于技术理论课教学是行之有效的，为改革体育院系的技术理论课教学提供了重要依据。     

Repeated measurements designs with unequal period sizes

Summary This paper is concerned with the designs in which each experimental unit is assigned more than once to a treatment, either different or identical. An easy method of constructing balanced minimal repeated measurements designs with unequal period sizes is presented whenever the number of periods is less than the number of treatments. Strongly balanced minimal repeated measurements designs with unequal period sizes are also constructed whenever the number of periods is less than the number of treatments.     

Needs Analysis And Objectives Setting in Curriculum Designing——with Special

Syllabusdesign———“theselection ,justificationandsequencingoflinguisticandexperientialcontent”(Nunan ,1993:5 5 ) ,“alongwithconsiderationsofmethodologyandevaluation”(Nunan ,1988:14 ) ,to gethermakeupthe“what”and“how”ofthecurricu lum .Inalearner centeredcurriculumtheselectionofmaterialmustbecarriedoutwithreferenceto“thetargetgoalsofthelearners”andthegradingandse quencingwithreferenceto“priorityoflearners’needs”and“notionsofdifficulty”(Nunan ,1993:6 0 ) .With outconsiderationof…     

性别文化对工业设计的影响

人类的性别地位在工业设计的发展中扮演着重要的角色。设计师在树立产品理念时,应该特别注意现代消费者的性别导向因素、性别的人机因素、性别的审美因素、经济因素、社会因素和心理因素及其变化趋势,采取适宜的设计策略。     

ON THE ESTIMATION OF TOTAL WEIGHT IN SINGULAR SPRING BALANCE WEIGHING DESIGNS UNDER THE CO VARIANCE MATRIX OF ERRORS s2G

The problem of the estimation of the linear combination of weights, c′w, in a singular spring balance weighing design when the error structure takes the form E(ee′) =s?²G has been studied. A lower bound for the variance of the estimated linear combination of weights is obtained and a necessary and sufficient condition for this lower bound to be attained is given. The general results are applied to the case of the total of the weights. For a specified form for G, some optimum spring balance weighing designs for the estimated total weight are found.     

Supersaturated design including an orthogonal base

Recently, many supersaturated designs have been proposed. A supersaturated design is a fractional factorial design in which the number of factors is greater than the number of experimental runs. The main thrust of the previous studies has been to generate more columns while avoiding large values of squared inner products among all design columns. These designs would be appropriate if the probability for each factor being active is uniformly distributed. When factors can be partitioned into two groups, namely, with high and low probabilities of each factor being active, it is desirable to maintain orthogonality among columns to be assigned to the factors in the high-probability group. We discuss a supersaturated design including an orthogonal base which is suitable for this common situation. Mathematical results on the existence of the supersaturated designs are shown, and the construction of supersaturated designs is presented. We next discuss some properties of the proposed supersaturated designs based on the squared inner products.     

数据库设计技巧

数据库设计的科学性和合理性对于提高数据库运行效率和数据库安全是至关重要的。文章从数据表的划分、表间关联、数据冗余处理、视图技术应用及中间表技术等方面论述了数据库设计中的一些技巧。