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A portable measurement system for the evaluation of human gait
Stefanovi? Filip,Caltenco Hector
Journal of Automatic Control , 2009, DOI: 10.2298/jac0901001s
Abstract: A tool has been developed which can be used to evaluate human gait in a more detailed manner. Its purpose is to record data from an individual during gait then categorize and analyze the intrinsic phases with neuro-fuzzy techniques. The system is simple to use, adaptive, highly mobile, and does not require calibration. The hardware consists of four accelerometers and four force sensitive resistors to record data during walking which is then prepared and collected by a digital device and PDA computer. The gait data is passed into an intelligent fuzzy inference system managed by custom defined fuzzy rules to be classified into four stance phases (heel strike, flat foot, heel lift, toe push-off), and three swing phases (initial flexion, terminal flexion, and terminal extension). After the fuzzy system was trained using data from five healthy subjects, the system's representative gait classification root mean squared error dropped from 0.2975 to 0.1200, showing a much improved ability to categorize human gait, despite its varied nature. The system represents a robust tool, which can be used in a clinical environment for the analysis of human gait in rehabilitative applications such as rule based control generation for functional electrical stimulation, and gait quality analysis.
Improving the Reliability of Unmanned Aircraft System Wireless Communications through Cognitive Radio Technology  [PDF]
Hector Reyes, Naima Kaabouch
Communications and Network (CN) , 2013, DOI: 10.4236/cn.2013.53027

Unmanned Aircraft System networks are a special type of networks where high speeds of the nodes, long distances and radio spectrum scarcity pose a number of challenges. In these networks, the strength of the transmitted/received signals varies due to jamming, multipath propagation, and the changing distance among nodes. High speeds cause another problem, Doppler Effect, which produces a shifting of the central frequency of the signal at the receiver. In this paper we discuss a modular system based on cognitive to enhance the reliability of UAS networks.

Chiral Dirac Equation Derived From Quaternionic Maxwell’s Systems  [PDF]
Hector Torres-Silva
Journal of Electromagnetic Analysis and Applications (JEMAA) , 2013, DOI: 10.4236/jemaa.2013.53017

In the present article we propose a simple equality involving the Dirac operator and the Maxwell operators under chiral approach. This equality establishes a direct connection between solutions of the two systems and moreover, we show that it is valid when the natural relation between the frequency of the electromagnetic wave and the energy of the Dirac particle is fulfilled if the electric field E is parallel to the magnetic field H. Our analysis is based on the quaternionic form of the Dirac equation and on the quaternionic form of the Maxwell equations. In both cases these reformulations are completely equivalent to the traditional form of the Dirac and Maxwell systems. This theory is a new quantum mechanics (QM) interpretation. The below research proves that the QM represents the electrodynamics of the curvilinear closed chiral waves. It is entirely according to the modern interpretation and explains the particularities and the results of the quantum field theory. Also this work may help to clarify the controversial relation between Maxwell and Dirac equations while presenting an original way to derive the Dirac equation from the chiral electrodynamics, leading, perhaps, to novel conception in interactions between matter and electromagnetic fields. This approach may give a reinterpretation of Majorana equation, neutrino mass, violation of Heinsenberg’s measurement-disturbation relationship and mass generation in systems like graphene devices.

N-Body Simulations of Small Galaxy Groups
Hector Aceves,Hector Velazquez
Physics , 2002,
Abstract: A series of N-body simulations aimed to study the dynamics of small groups of galaxies are presented. The properties of small galaxy groups are very well reproduced, and those of Hickson's compact groups are well reproduced by the most advanced stage of collapsing groups. We find no overmerging problem in our simulations. An important fraction of groups (~40%) initially in virial equilibrium can last for ~10 Gyr without complete merging. These results provide an alternative solution to the overmerging expected in Hicksons's compact groups.
Compiling Uncertainty Away in Conformant Planning Problems with Bounded Width
Hector Palacios,Hector Geffner
Computer Science , 2014, DOI: 10.1613/jair.2708
Abstract: Conformant planning is the problem of finding a sequence of actions for achieving a goal in the presence of uncertainty in the initial state or action effects. The problem has been approached as a path-finding problem in belief space where good belief representations and heuristics are critical for scaling up. In this work, a different formulation is introduced for conformant problems with deterministic actions where they are automatically converted into classical ones and solved by an off-the-shelf classical planner. The translation maps literals L and sets of assumptions t about the initial situation, into new literals KL/t that represent that L must be true if t is initially true. We lay out a general translation scheme that is sound and establish the conditions under which the translation is also complete. We show that the complexity of the complete translation is exponential in a parameter of the problem called the conformant width, which for most benchmarks is bounded. The planner based on this translation exhibits good performance in comparison with existing planners, and is the basis for T0, the best performing planner in the Conformant Track of the 2006 International Planning Competition.
Information Theory and Computational Thermodynamics: Lessons for Biology from Physics
Hector Zenil
Information , 2012, DOI: 10.3390/info3040739
Abstract: We survey a few aspects of the thermodynamics of computation, connecting information, thermodynamics, computability and physics. We suggest some lines of research into how information theory and computational thermodynamics can help us arrive at a better understanding of biological processes. We argue that while a similar connection between information theory and evolutionary biology seems to be growing stronger and stronger, biologists tend to use information simply as a metaphor. While biologists have for the most part been influenced and inspired by information theory as developed by Claude Shannon, we think the introduction of algorithmic complexity into biology will turn out to be a much deeper and more fruitful cross-pollination.
On Intellectus Agens and Aristotellian separate substances: Aquinas' waterloo
Zagal, Hector;
Kriterion: Revista de Filosofia , 2005, DOI: 10.1590/S0100-512X2005000100009
Abstract: the present paper deals with saint thomas's commentary to aristotle's de anima iii, in wich we find the famous analogy of light. it is sustained that due to the limitations of the analogy, saint thomas is forced to introduce a series of neo-platonic elements incompatible with aristotle's philosophy. the author means to explain this "betrayal" to aristotle's philosophy by one of his most credited commentators. it is concluded that in order to reconcile the pagan world with the catholic theology, thomas aquinas needs to redirect aristotle through a less economical argument; that is, the introduction of the intellectus agens
Bronquitis asmática y golpe vitamínico
Revista chilena de pediatría , 1945,
Correa, Francois. El sol del poder. Simbología y política entre los muiscas del norte de los Andes.
Llanos Hector
Maguaré , 2005,
Abstract: Correa, Francois. El sol del poder. Simbología y política entre los muiscas del norte de los Andes. Bogotá: Universidad Nacional de Colombia. 2005
Seminario sobre arqueología y pensamientos simbólicos aborígenes
Llanos Hector
Maguaré , 2005,
Abstract: El Laboratorio de Arqueología del Departamento de Antropología, de la Facultad de Ciencias Humanas de la Universidad Nacional de Colombia y el Museo del Oro del Banco de la República realizaron el seminario Arqueología y pensamiento simbólico, durante los días septiembre 30 y 1 de octubre de 2004.
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