Sistema Regional de Información
en línea para Revistas Científicas de América Latina,
el Caribe, España y Portugal

Optimal product-mix means to determine the quantity of products to produce to maximize the gain. To determine the optimal product-mix of the Cooperativa Industrial Manufacturas del Centro from Huancayo city, the most important textile company in the region Andrés A. Cáceres, it has been built a hybrid model combining the discrete-event simulation and the genetic algorithms. The discrete-event simulation is used to infer the indirect unitary cost of each product due to the use of a system activity-based costing. To apply a system activity-based costing the posteriori information is required to, but one can know it (to approach it) a priori applying the discrete-event simulation. The genetic algorithms determine the optimal product-mix that maximizes the utility. These genetic algorithms use the code of value for the chromosomes and they include techniques for the solution of problems with lineal restrictions. The optimal product-mix obtained with the model decrease the losses of the product-mix used in the first semester, of those products whose unitary cost is greater than its price in 43% and they increase the utility in 123%.

In the country it was thought that the scientific research it could make only certain people, presently is within reach of all. In the last years terminologies and definitions have been created that "assure" the validity the project and after the results; it caused that courses on investigation were created, each one with its own methodology. The Concytec established the Scholastic Fair of Science and Technology with the purpose of waking up vocations by the investigation from the school. This work was made on base to the scholastic fairs interviewing to students and professors of schools; in addition to professors to courses of investigation in the universities and professionals who graduated with thesis. One was that the students of schools have interest by the investigation, the university students see it more complicated and consider to investigate is difficult by the detailed courses on methodology of the investigation that impose to them, those that graduate with thesis delayed in average a year in culminating it. Teaching to make the investigation in natural form and practice is pleasant for the students.

Currently the investigation in the area of routers is carried out for tools of simulation, existing a great difference among the simulation and the real world. The investigators in this area affirm that it is necessary to count on real conditions to validate the results and not only to utilize tools of simulation. The majority of the routers are teams with designs closed, inflexible and static. To add new functionalities al router requires the access to the interfaces of the software in the road of sent of packages, but these normally do not be available. Being evident the need to count with settings that permit to complete the circle among the experimentation and the real world, this paper describes the developments open software of router, that are being carried out with the purpose of building a software of router complete that be a platform of investigation and stable implementation.

Between 1970 and 2003 the medium and large term Peruvian Public Foreign Debt had receiving of foreign countries an total amount of $ 32 656 million, having amortized $ 31 513 million and having paid as interests a amount of $ 26 549 million, that is meaning a foreign extern service of $ 58 062. This is a minus capitalization of Perú for $ 25 406 millions in this period, that made an annual average of 770 millions that meaning go out more recourses than be income in the country, and this is a falseness of called “extern aid”. The time of greater minus capitalization was between 1986 y 1990.

The present investigation´s work denominated arise of the deficiency in the planning and execution of investigation proyect that have the student of the school of system engineering, this is reflect for want of coherence in the redaction scientist and in the assimilation of the methodology for elaborate the investigation´s matrix , because the students don’t develop the investigation´s capacitys that his permit elaborate projects. For it is thought draw and apply a model didactic based in the active methods for the university course of investigation´s methodology that permit the elaboration y execution of investigation´s scientific projects. The model didatic denominated “Ciclic crescent” has a pedagogic model constructivist, his objetic is that the students reach level upper intellectuals, the same as critic thought ,the heuristic, the innovation, the taking decision and the problem´s solution. The model didactic “ciclic crescent” seek to reach competitions in the students it is characterize for a teachiong builder of sense since the student , as soon as, a teaching criticism and dialogue collective with a integral evaluation. The ejecution the model didactic “ciclic crescent” was possible though of the apprenticeship´s guide of the university course of investigation´s methodology of the area of formation general of the school of engineering’s systems, it has 15 sessions, We applied a pre test and a post test about the aptitude for elaborate and execute investigation projects, realizing information´s compilation and the respective treatment, I reach to conclusion that exist a significant influence in the improvement thes capacitys.

We have studied the influence of gamma radiation in a colloidal suspension of ZnO. A first ZnO colloid was prepared from Zn(CH3COO) 2.2H2O, LiOH.H2O and ethyl alcohol, while the second was prepared from Zn(CH3COO) 2.2H2O, NaHO and propyl alcohol. The ZnO colloids were irradiated at 30, 50, 75 and 100 kGy. These irradiated colloids were characterized by Transmission Electron Microscopy (TEM) and UV-Vis spectroscopy. ZnO films were produced by spray-pyrolysis technique from irradiated colloids, these films were characterized by X-ray diffraction (XRD). To evaluate the electrical properties of ZnO films, these films were fabricated on alumina substrates with gold electrodes printed and the system served us as gas sensor. The study of the dependence of the conductance with temperature in air, shows that the electrical conductivity of the sensors varies depending on the crystalline composition, operating temperature and the dose at which colloids have been irradiated. Different response patterns were found when the sensors are exposed to Natural Gas (NG) and Liquefied Petroleum Gas (LPG), typical responses of n-type, duals and p-type semiconductor sensors have been found.

Throughout human existence, the treatment of illnesses has always been a constant concern. Now that the world population has increased and the illnesses have multiplied, the sale of drugs has become one of the main businesses in the world. Like we know, natural medicine is an important alternative in the treatment and prevention of illnesses. Given these assumptions, we have made an important investigation it has allowed us to generate this article. The objective of this article is to explain the how to model an Expert System for the prevention and treatment of illnesses based on the daily food consumption. In summary, the Expert System (ES) that we have modelling, permit you to register as entry symptoms, illnesses, or medical test results from a patient and generates as output a list of alternatives of foods that the patient should consume at breakfast, lunch, and supper. Thus, the patient relieves their symptoms, maintaining where possible their normal food consumption habits. Of course the ES will be responsible for the linkage of the dishes recommended by the system with natural products that relieve the symptoms registered as input. Obviously, for each patient with different symptoms, it is hoped that ES recommend different dishes.

The present work is oriented to offer a communication via to the many people who undergo of a severe loss of function motorboat as a result of different accidents and/or diseases, so that they can control and interact better with his environment, for which an brain-computer interface has been implemented through the acquisition of EEG signals by electrodes, implementation of algorithms to extract characteristics and to execute a method of classification of such way to interpret these signals and to execute corresponding actions. The first objective to design and to construct to a System of Communication and Control Based on the Thought able to catch and to measures EEG signals. The second objective is to implement the system of data acquisition including a digital filter in real time that allows us to eliminate the noise. The third objective is to analyze the variation of the EEG signals in front of the different tasks under study and of implementing an algorithm of extraction of characteristics. The fourth objective is to work on the base of the characteristics of the EEG signals, to implement a classification system that allows to discriminate the 2 tasks under study and on the basis of it of conducting the corresponding battles.

In the present article, a mathematical model for the b- immobilized fructofuranosidase was constructed considering the partition equilibrium between the liquid phase and the particle, diffusion and reaction within the particle. The kinetic constants were estimated by fitting the kinetic equations with the experimental data of the fructosyl-stevioside experiments using suspended enzyme. The other constants were estimated by fitting the mathematical model with experimental data of partition equilibrium coefficient, and fructosyl-stevioside synthesis using immobilized enzyme. The model could describe the fructosyl-stevioside formation under several conditions of initial concentration of substrate and total enzyme in the system.

This article emphasizes research on different forms of interaction between man - machine, which will widely spread out in a not too distant future through physical robots, virtual robots, or orders issued by the human brain processed by electrodes capable of capturing the energy of the biochemical process between neurons and thus read human thought. Robots during Man – Machine interaction must constantly make decisions. Therefore, when building knowledge bases it is important to consider the following steps: analysis of data, analysis of the representation of information based on taxonomic criteria, identification of axioms, suggested protective mechanism of axioms, inference mechanism suggestion, evaluation of formal systems, recommendation of formal systems, recommendation of the most convenient and expressive formal system for the representation of each of the axioms, recommendation to the team of software engineers of the most appropriate mechanism for incorporating axioms & rules. Finally, it draws conclusions and reflections of the author on this new paradigm of Computer Sciences.