The present edition of Computación y Sitemas includes six articles related basically in two items: Cualitative Reasoning and Robotics.

Llanos, Cuberos, et al, present an analysis of three methods that comparate secuences wich represent the behavior for a system that evolutes with the time, and that is searching to recognize Behavior Patterns (similituds) in that sequencies. The principal reason for this work is to review complex systems using reasoning mechanisms based in a previously extracting knowledgement.

Ruíz, Angulo, et al. present the algorithm desing for learning systems with the presence of information with different precision levels, using cualitative reasoning. The authors propose the use of a Nucleo Function that act among tha data that belong to a cualitative space of absolute magnitude orders and they take up a finance application wich are used for credit risk predictions.

Morales Villanueva and García Hernández, present a work related with movil computation. In this case, it is proposed an efficient scheme of management of localization movil nodes in a movil IP systems. This scheme is based in an optimization model that use cells groups to minimize the traffic for actualization.

Aguilar, Bonilla and Chavoya, present a control work. In this case, the proposition is a linear control law for a robotic manipulator with two grades for liberty, and its objective is stabilize it and try to coincide its behaviour with a lineal model.

Zemliak, Ríos y Zemliak, present another control work. The proposition is to formulate the desing process of analogical circuits using the control theory as basis. This process give different desing strategies and it plan the use of an optimal control theory to determinate among them the most efficient strategy, talking about computation.

Finally, it is presented the Ph. D Thesis by Hermilio Sánchez Cruz, who proposes a similitude of measure to bidimensional objects. The principal aspect in this work is to optimize an original proposed method by the thesis director (Ernesto Bribiesca Correa), trying to minimize the transformation energy. The method its applied to objects from the real world, such as cars and Mexican volcanoes.

It is expected to be interest for the researchers and students in that involved areas, the artocles above mentioned.

Carlos Artemio Coello Coello
Associate Editor