设计了一种变速箱控制器模块（TCM）的CAN总线上位机软件,实现了对TCM的参数设置及状态监控.为了保证上位机与TCM通信时能同步进行数据解码和运算分析,引入了多线程技术.同时,在数据量较大的情况下现有VC程序绘制动态波形的效率较低,容易引发绘制波形的数据被覆盖而导致波形显示不完全,为此,在程序中加入了对数据的队列操作.结果显示,该方法能保证波形动态显示的实时性和完整性.
The school bus routing problem(SBRP)seeks to plan an efficient route schedule of a fleet of school buses that pick up students and deliver them while satisfying various constraints.Most of existing SBRP algorithms focus on reducing the total bus travelling distance instead of reducing the number of buses required.Considering that the cost of bus purchase and maintenance accounts for a large percentage in school bus operations,this paper proposes an ant colony optimization(ACO)algorithm for the bi-objective SBRP.The optimization objectives are to minimize the number of buses required and the total traveling distance.The key algorithm procedures such as the bus route construction,the ant pheromone setting and updating,and the local search for solution improvement are discussed in details.The proposed algorithm is tested on a set of benchmark instances.The computational results show that the local search procedure embedded in ACO is capable of improving the solution quality significantly.The performance of the algorithm is also verified by comparing it with the IBM ILOG CPLEX optimizer.For the small instances that CPLEX can obtain the optimal number of required buses,our algorithm can also find the minimum number of required buses.While for the large instances,our algorithm outperforms CPLEX in terms of solution quality and computation time.
Based on solving the unconstrained optimization problems,we propose a cautious BFGS method for solving the extreme eigenvalue problems of large scale symmetric and positive definite matrices.The method effectively avoids the problem of solving the inverse problem of the large scale Hession matrix.Then,we prove the global convergence of the algorithm under some reasonable conditions.Finally,we compare our method with EIGS(a matlab implementation for computig the extreme eigenvalue of matrix).The numerical experiments show that the proposed method is fast,efficient and stable.
In recent five years,the theoretical research of the editology has focused more on the basic concepts,the basic principles,the nature of the discipline,the system of the discipline,the research methods and so on.The wordbig editionproposed by the researchers has a distinct feature of the times,displaying the new progress in the theoretical research of editology.The research of the editorial subject mainly involves role transformation,ability cultivation and team construction of the editors.The researchers generally believe that the application of digital technology in the publishing industry has brought new opportunities and challenges to the editors,and only by changing their roles,can the editors adapt to the new requirements of the development of multimedia in the digital age.The most representative researches include the analysis of the path and direction of the editor's role transformation,the analysis of the elements of the editing ability,and the study of ability improvement methods,which not only reflects the humanistic care of the researchers,but also highlights the special status of the editorial subject in the editorial activities.The research of editorial practice mainly has focused on the innovation of editorial work,system reforms of newspapers and periodicals,the editing process and so on in all the media period.The researchers have combined the reform and innovation of the editorial work with the current media convergence and system reform,and have connected with the process and links of edition with digital publishing technology closely,showing a research feature of pragmatism.
Enamel,the hardest organization in human body,is composed of enamel rod and inter-rod enamel.It has excellent anti-wear properties in the process of eating and chewing food.In this paper,the erosion effects of vinegar on the surface mechanical and tribological behaviors of human tooth enamel have been investigated in vitro.Rice vinegar and white vinegar were used as erosion mediums,and the erosion time was 5 min.The nano-mechanical properties and micro-tribological behavior of enamel were examined using a nano-indenter/scratchtester.The surfaces of enamel were analyzed by means of various microscopic examinations.The results showed that both rice vinegar and white vinegar could result in the surface damage of human enamel.After 5 min erosion in the two vinegar solutions,the indentation hardness and elastic modulus of enamel decreased significantly and the coefficient of friction showed a big fluctuation.It was also found that the wear resistance of the eroded enamel was reduced.Under the same condition of erosion,white vinegar had a little more significant erosion effect on human tooth enamel than rice vinegar.
