Ing. Luis E. Garcia Castillo (original) (raw)

Papers by Ing. Luis E. Garcia Castillo

Synergismus Scyentifica Utfpr, Feb 19, 2010

Resumo-De acordo com a suposição da presença de uma variedade invariante de atração com respeito ... more Resumo-De acordo com a suposição da presença de uma variedade invariante de atração com respeito ao qual o equilíbrioé assintóticamente estável,é comprovado a estabilidade assintótica de um equilíbrio de um sistema não linear. Este resultadoé aplicado ao problema de estabiliçabilidade de um sistema de controle.

Brazilian Journal of Animal and Environmental Research

Se compararon dos métodos (combustión húmeda y calcinación a 550 ºC) para la determinación de la ... more Se compararon dos métodos (combustión húmeda y calcinación a 550 ºC) para la determinación de la materia orgánica en materiales orgánicos. En el ensayo participaron nueve laboratorios, empleando cinco materiales orgánicos (tres composts y dos sustratos), analizados por cuadruplicado. La precisión se evaluó calculando la repetibilidad y la reproducibilidad, según la norma COVENIN 2972-92 (ISO 5725-86). No se encontraron diferencias significativas entre métodos, laboratorios, ni réplicas, por lo que se asume que los métodos comparados generan resultados estadísticamente iguales. La precisión evaluada a través de la repetibilidad y la reproducibilidad no resultó dependiente del nivel de materia orgánica. Los menores valores de repetibilidad y reproducibilidad obtenidos con el método de calcinación indican que esta modalidad analítica es más precisa. Se recomienda la aplicación del método de calcinación porque se basa en un procedimiento rápido, sencillo, no consume reactivos químicos y...

AIBR. Revista de Antropología Iberoamericana, 2012

Claude Bataillon afirmaba, a finales de la década de los sesenta en su estudio sobre “Las regione... more Claude Bataillon afirmaba, a finales de la década de los sesenta en su estudio sobre “Las regiones geográficas en México”, que uno de los rasgos más enigmáticos de México era su red municipal. Bataillon hacía esa afirmación desde su mirada como geógrafo social y en referencia a los muy diversos tamaños de los municipios y su relación tanto con la densidad de la población como con sus características históricas y étnicas.

AI Magazine, 2009

SPARK'08 was the first edition of a workshop series designed to provide a stable, long‐term f... more SPARK'08 was the first edition of a workshop series designed to provide a stable, long‐term forum where researchers could discuss the applications of planning and scheduling techniques to real problems. Animated discussion characterized the workshop, which was collocated with the 18th International Conference on Automated Planning and Scheduling (ICAPS‐08) held in Sydney, Australia, in September 2008.

Revista Pueblos y fronteras digital, 2013

Reseña a Identidad y migración en la formación y revalorización de los territorios rurales, 2011,... more Reseña a Identidad y migración en la formación y revalorización de los territorios rurales, 2011, coordinado por Héctor M. Robles Berlanga y Cristóbal Santos Cervantes, Universidad Autónoma Metropolitana, Unidad Xochimilco, Serie Mundos Rurales, ISBN 978-607-477-662-1.

Liminar Estudios Sociales Y Humanisticos, 2004

Aposta Revista De Ciencias Sociales, 2015

Los mercados de educación superior se caracterizan por ser altamente competitivos. En este escena... more Los mercados de educación superior se caracterizan por ser altamente competitivos. En este escenario un grupo de universidades han definido su estrategia de crecimiento a través de la oferta de programas de estudios en el formato a distancia. Esta situación se observa en Chile, donde de un total de 60 universidades que operan en el sector de educación superior, 14 ofrecen este tipo de programas. Sin embargo, en Chile la oferta se concentra principalmente en estudios de capacitación, perfeccionamiento y postítulo. Dado esto, se concluye que es necesario que las instituciones de gobierno regulen la calidad de los programas ofrecidos, y que las universidades operen con responsabilidad. Esto permitirá que el mercado laboral mejore la percepción que tiene sobre la educación a distancia, y con esto que sean más los estudiantes que opten por estos tipos de programas.

Agave americana L. and Furcraea andina Trel. (Asparagaceae), are important species for search of ... more Agave americana L. and Furcraea andina Trel. (Asparagaceae), are important species for search of new pesticide agents. The dipteran Culex quinquefasciatus is common in aquatic environments of Lima and causes painful stings in people. The gastropod Heleobia cumingii D'Orbigny, 1835 is a native snail found in lotic and lentic aquatic environments of Peru. Thus, the aim of this study was to evaluate the effect of the insecticide and molluscicide of dry leaves powder and juice in aqueous of A. americana and F. andina on C. quinquefasciatus and H. cumingii. The end point was the mortality of the larvae of C. quinquefasciatus and of the snail H. cumingii. Bark of F. andina showed higher insecticidal effect in relation to other aqueous extracts in toto and periderm evaluated in both plant species. The extract in toto of A. americana showed a greater effect molluscicide in relation to the rest of aqueous aqueous extracts of bark and periderm evaluated in both plant species. Aqueous extr...

Lecture Notes in Computer Science, 2003

This paper discusses the need for an AI temporal planner to represent ill defined and imprecise t... more This paper discusses the need for an AI temporal planner to represent ill defined and imprecise temporal knowledge for real world problems. The ability to deal with imprecise knowledge provides a flexible framework for temporal planning, in contrast with the rigidity of classical temporal planners, and it concerns all of the stages of the planning process, that is, from domain and plan representation to plan generation and execution monitoring.

Lecture Notes in Computer Science, 2007

Pathology and Laboratory Medicine International, 2010

Background: Human ovarian reserve is defined by the population of nongrowing follicles (NGFs) in ... more Background: Human ovarian reserve is defined by the population of nongrowing follicles (NGFs) in the ovary. Direct estimation of ovarian reserve involves the identification of NGFs in prepared ovarian tissue. Previous studies involving human tissue have used hematoxylin and eosin (HE) stain, with NGF populations estimated by human examination either of tissue under a microscope, or of images taken of this tissue. Methods: In this study we replaced HE with proliferating cell nuclear antigen (PCNA), and automated the identification and enumeration of NGFs that appear in the resulting microscopic images. We compared the automated estimates to those obtained by human experts, with the "gold standard" taken to be the average of the conservative and liberal estimates by three human experts. Results: The automated estimates were within 10% of the "gold standard", for images at both 100× and 200× magnifications. Automated analysis took longer than human analysis for several hundred images, not allowing for breaks from analysis needed by humans. Conclusion: Our results both replicate and improve on those of previous studies involving rodent ovaries, and demonstrate the viability of large-scale studies of human ovarian reserve using a combination of immunohistochemistry and computational image analysis techniques.

Microbiology, 2004

Searches in a Candida albicans database (http://genolist.pasteur.fr/CandidaDB/) identified two In... more Searches in a Candida albicans database (http://genolist.pasteur.fr/CandidaDB/) identified two Individual Protein Files (IPF 15363 and 19968) whose deduced amino acid sequences showed 42 % and 45 % homology with Saccharomyces cerevisiae Pir4. The two DNA sequences are alleles of the same gene (CaPIR1) but IPF 19968 has a deletion of 117 bases. IPF 19968 encodes a putative polypeptide of 364 aa, which is highly O-glycosylated and has an N-mannosylated chain, four cysteine residues and seven repeats. Both alleles are expressed under different growth conditions and during wall construction by regenerating protoplasts. The heterozygous mutant cells are elongated, form clumps of several cells and are hypersensitive to drugs that affect cell wall assembly. CaPir1 was labelled with the V5 epitope and found linked to the 1,3-b-glucan of the C. albicans wall and also by disulphide bridges when expressed in S. cerevisiae.

Expert Systems with Applications, 2008

In this paper, we present SAMAP, whose goal is to build a software tool to help different people ... more In this paper, we present SAMAP, whose goal is to build a software tool to help different people visit different cities. This tool integrates modules that dynamically capture user models, determine lists of activities that can provide more utility to a user given the past experience of the system with similar users, and generates plans that can be executed by the user. This system is intended to work in portable devices (mobile phones, PDAs, etc,) with internet connection. In this paper, we describe the architecture, the knowledge model that is shared among components using an ontology, and the three components of the tool: user module, case-based module and planning module.

A general fully coupled multi-hybrid method in three dimensions (3D) combining the Finite Element... more A general fully coupled multi-hybrid method in three dimensions (3D) combining the Finite Element Method (FEM), the Method of Moments (MoM), and a high frequency asymptotic technique, Physical Optics (PO), is presented. Complex radiating structures are analyzed with FEM (which easily handles complex geometries, permeable materials, anisotropy, and so on) while small and medium size perfect electric conductor (PEC) objects are rigorously analyzed using MoM; large PEC objects can be efficiently analyzed with PO. Furthermore, different regions of the same object can be modeled with MoM and PO. That provides the possibility, for instance, of taking into account the edge effects of PEC objects without the need of introducing artificial line currents at the edges, as the Physical Theory of Diffraction (PTD) does. Several numerical results are presented showing the validity of the method.

One of the main obstacles in applying AI planning techniques to real problems is the difficulty t... more One of the main obstacles in applying AI planning techniques to real problems is the difficulty to model the domains. Usually, this requires that the people that have developed the planning system carry out the modeling phase, since the representation depends very much on a deep knowledge of the internal working of the planning tools. Since, in Business Process Reengineering (BPR), there has already been some work on the definition of languages that allow non-experts to enter knowledge on processes into the tools, we propose here the use of one of such languages to enter knowledge on the organisation processes. As instances of this domain, we will use the workflow modeling tool SHAMASH, where we have exploited its object oriented structure and rule-base approach to introduce the knowledge through its user-friendly interface. Then, we have used a translator to transform it into predicate logic terms. After this conversion, real models can be automatically generated using a planner that integrates Planning and Scheduling, IPSS. We present results in a simplified real workflow domain, the TELEPHONE INSTALLATION (TI) domain.

This work presents a translation process from a standard representation of plans into a standard ... more This work presents a translation process from a standard representation of plans into a standard executable format for Business Process Management (BPM). This translation is conceived as a Knowledge Engineering for Planning process that bridges the existing gap between AI Planning and Busines Process Management and provides support for the direct execution of plans playing the role of Human-Centric processes.

This work describes the solutions adopted to the problems tackled during the development of SIADE... more This work describes the solutions adopted to the problems tackled during the development of SIADEX, an intelligent planning and scheduling application where users play a central role. The system is being developed under a research contract with the Andalusian Regional Ministry of Environment (Spain) and integrates planning and scheduling techniques in a service oriented architecture devoted to support decisions on crisis intervention planning.

This paper presents some enhancements in the temporal reasoning of a Hierarchical Task Network (H... more This paper presents some enhancements in the temporal reasoning of a Hierarchical Task Network (HTN) planner, named SIADEX, that, up to authors knowledge, no other HTN planner has. These new features include a sound partial order metric structure, deadlines, temporal landmarking or synchronization capabilities built on top of a Simple Temporal Network and an efficient constraint propagation engine boosted by exploiting the causal structure of plans.