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Basketball is one of the students' favorite ball games, and it is also one of the most popular sports for college students to carry out after class. Especially in recent years, with the spread of NBA culture around the world and the extensive development of CUBA in domestic colleges and universities, Yao Ming has appeared in China to compete in the NBA and achieve brilliant achievements. With the increasing investment in the number of basketball venues, basketball itself, as a sport with low dependence on venues, equipment, and people, has the characteristics of economy, convenience, and remarkable sports effect compared with other sports. College students' basketball skills, basketball awareness, and love for basketball are increasing day by day. Attribute reduction algorithm is one of the core contents of knowledge discovery, which describes whether every attribute in the attribute set of information system is necessary and how to delete unnecessary knowledge. Based on the attribute reduction algorithm, this paper studies the early warning of basketball injury risk. The basketball injury can not only make athletes unable to participate in training or competition, but even cripple or lose their lives, which hinders the normal development of sports. Therefore, we should make a comprehensive and objective analysis of sports training to find out the causes of sports injuries, so as to prevent sports injuries. This algorithm takes the attribute frequency as the heuristic information and solves the attribute selection problem when the attribute frequency is the same. [ABSTRACT FROM AUTHOR]

In Cuba, from the seventies of the past century, different algorithms to study stationary and transient regimes of the Cuban Electric System were developed. Those algorithms and computer programs were focused in the study of transient stability. Currently, we use widely the computer program "Power System Explorer" (PSX) which have a lot of facilities to make studies about stationary and transient regimes of electric power systems. Due to the studies about planning of electric power systems and the accumulated experience working with Cuban Electric System, the need of study the problems related with voltage stability of Cuban Electric System has arisen. In this paper, we make a first review about some static and dynamic mathematical methods included in bibliography about voltage stability of electric power systems. [ABSTRACT FROM AUTHOR]

The Vehicle Routing Problem (VRP) has been extensively studied by different authors, often specialists in the areas of Operations Research and Logistics. Sometimes this problem is so complex that it requires algorithms to find feasible solution in time with adequate quality. Several researches have shown the effective use of heuristic algorithms on vehicle routing for large dimension problem. Moreover, in a not least important researches solutions are demonstrated with exact and approximate algorithms (the approximate not be addressed in this research) applied to problems with lower dimensions. For that reason the aim is to make an analysis before optimization process of real VRP in order to know which group of algorithms (exact or heuristic) will be the possible solution of them. The paper proposes Discriminate Analysis in order to classify the solution area for a real VRP in Cuban Enterprise. [ABSTRACT FROM AUTHOR]