Instituto Tecnológico Autónomo de México

About: Instituto Tecnológico Autónomo de México is a education organization based out in Mexico City, Mexico. It is known for research contribution in the topics: Politics & Population. The organization has 1098 authors who have published 2532 publications receiving 39083 citations. The organization is also known as: Instituto Tecnologico Autonomo de Mexico & Mexico Autonomous Institute of Technology.

Determination of Allicin in Garlic and Commercial Garlic Products by Gas Chromatography with Flame Photometric Detection

Abstract: Dosage de l'allicine dans des epices et des produits commercialises parapharmaceutiques. La limite de detection est de 0,02 mg/g. L'alliin, precurseur de l'allicine, est dose par une autre methode

Linguistically Defined Clustering of Data

Abstract: Abstract This paper introduces a method of data clustering that is based on linguistically specified rules, similar to those applied by a human visually fulfilling a task. The method endeavors to follow these remarkable capabilities of intelligent beings. Even for most complicated data patterns a human is capable of accomplishing the clustering process using relatively simple rules. His/her way of clustering is a sequential search for new structures in the data and new prototypes with the use of the following linguistic rule: search for prototypes in regions of extremely high data densities and immensely far from the previously found ones. Then, after this search has been completed, the respective data have to be assigned to any of the clusters whose nuclei (prototypes) have been found. A human again uses a simple linguistic rule: data from regions with similar densities, which are located exceedingly close to each other, should belong to the same cluster. The goal of this work is to prove experimentally that such simple linguistic rules can result in a clustering method that is competitive with the most effective methods known from the literature on the subject. A linguistic formulation of a validity index for determination of the number of clusters is also presented. Finally, an extensive experimental analysis of benchmark datasets is performed to demonstrate the validity of the clustering approach introduced. Its competitiveness with the state-of-the-art solutions is also shown.

The Best Neural Network Architecture

Abstract: When designing neural networks (NNs) one has to consider the ease to determine the best architecture under the selected paradigm. One possible choice is the so-called multi-layer perceptron network (MLP). MLPs have been theoretically proven to be universal approximators. However, a central issue is that the architecture of the MLPs, in general, is not known and has to be determined heuristically. In the past, several such approaches have been taken but none has been shown to be applicable in general, while others depend on complex parameter selection and fine-tuning. In this paper we present a method which allows us to determine the said architecture from basic theoretical considerations: namely, the information content of the sample and the number of variables. From these we derive a closed analytic formulation. We discuss the theory behind our formula and illustrate its application by solving a set of problems (both for classification and regression) from the University of California at Irvine (UCI) data base repository.

Private Infrastructure Concessions: The 1989-1994 National Highway Program in Mexico

Abstract: In the late 1980s Mexico, like other emerging economies, embarked upon an accelerated expansion of its toll highway system by offering concessions to the private sector for construction and operation. The government awarded Build-Operate-Transfer (BOT) contracts where a private entity builds the infrastructure and operates it for a specific period. Then, in theory, once the private entity has recovered its investment and obtained a certain return, the infrastructure reverts to the public sector. This model has gained wide acceptance not only to roads but in water supply and power. However, agency cost in imperfectly competitive markets, like network industries, often led to opportunistic behavior by concessionaires. Income guarantees should be used as incentive devices before demand and political risk to reward efficiency throughout project life span instead of serving as a means of indiscriminate compensation. An alternative to such contracts is proposed when the full transfer of ownership rights to the infrastructure assets is not feasible.