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Design and Analysis of a Coverage Optical Device for IR-WLAN Using SMS Method in Three Dimensions Dise o y análisis de un dispositivo óptico de cobertura para IR-WLAN por SMS en tres dimensiones
Dioén Biosca Rojas,Maikel Hernández Sanz
Revista Cubana de Ingeniería , 2010, DOI: 10.1234/rci.v1i1.5
Abstract: In this paper the features of the Simultaneous Multiple Surfaces (SMS) design method are described. The method is addressed for designing optical devices in two dimensions (2D) as well as in three dimensions (3D). A 2D design is presented as an example and a complete 3D design of a specific optical device is developed. The prototype just synthesised finds application as an optical element of coverage systems in wireless indoor infrared networks. The statement of the problem is made directly in 3D, the device is accomplished and the transmission curves obtained by simulation are presented using a commercial ray tracing software. In the field of applications, a panoramic view of different coverage systems in wireless indoor infrared networks is made and several alternatives of use are suggested for the new designed device. En el presente trabajo se describen las particularidades del método de dise o de Superficies Múltiples Simultáneas o SMS, en el dise o de dispositivos ópticos tanto en dos dimensiones (2D) como su extensión a tres dimensiones (3D). Se brinda un ejemplo de dise o de dispositivo 2D y se desarrolla particularmente el dise o de un dispositivo 3D para su aplicación como elemento óptico en sistemas de cobertura para redes inalámbricas infrarrojas en interiores. A lo largo del dise o se realiza el planteamiento del problema directamente en 3D, se obtiene el dispositivo y se presentan las curvas de transmisión del mismo obtenidas por simulación mediante trazado de rayos. Respecto a la aplicación, se realiza una panorámica de los diferentes sistemas de cobertura existentes para las redes inalámbricas infrarrojas en interiores y se presentan varias alternativas de aplicación del dispositivo dise ado en variantes de los sistemas convencionales de cobertura.
El método biográfico en investigación social: potencialidades y limitaciones de las fuentes orales y los documentos personales
Sanz Hernández, Alexia
Asclepio : Revista de Historia de la Medicina y de la Ciencia , 2005,
Abstract: The biographical reconstruction is a game of intersubjectivities that emerges essentially from the person and her testimony, either oral or written. Memory, identity and sociability are also devices from which there are to understand the potentialities and limitations of the oral and material documents of life, sources on which the biographical investigation is based. This paper is a didactic essay about how to make it. La reconstrucción biográfica es un juego de intersubjetividades que emerge esencialmente de la persona y de su testimonio, ya sea oral u escrito. Memoria, identidad y sociabilidad son igualmente dispositivos desde los cuales hay que entender las potencialidades y limitaciones de los documentos orales y materiales de vida, fuentes sobre las que se fundamenta la investigación biográfica. El trabajo muestra, de un modo práctico o didáctico, cómo orientarse en este proceso.
Arteritis de Takayasu de evolución fulminante en una paciente pediátrica
Vargas-Sanabria,Maikel; Valerio-Hernández,Mayela;
Acta Médica Costarricense , 2007,
Abstract: abstract we present the case of a previously healthy 4 monthsold child, , who suffered a 4 day illness, unspecific at the beginning, but during her last day showed signs of tissue hipoperfusion, had 2 cardicac arrests and died. the forensic autopsy and histological examination demonstrated great vessels vasculitis. this findings are compatible with takayasu?s arteritis. takayasu is a very uncommon disease in the occidental hemisphere, and is also unusual in caucasic children and uncommonly has a lethal outcome.
Arteritis de Takayasu de evolución fulminante en una paciente pediátrica
Maikel Vargas-Sanabria,Mayela Valerio-Hernández
Acta Médica Costarricense , 2007,
Abstract: Resumen Se presenta el caso de una lactante de 4 meses, conocida sana, con un cuadro de 4 días de evolución, inicialmente inespecífico, que el último día se tornó fulminante, con signos francos de hipoperfusión tisular, que la llevaron a 2 paros cardiorrespiratorios y a la muerte. Al realizarse la autopsia médico legal y el estudio histopatológico se encontró una vasculitis de grandes vasos, correspondiente con enfermedad de Takayasu. La arteritis de Takayasu es por sí misma muy poco frecuente en el hemisferio occidental, esto aunado a que se manifieste en una lactante caucásica con evolución fulminante, constituye una entidad extremadamente rara y por lo tanto de interés para un diagnóstico más expedito. Abstract We present the case of a previously healthy 4 monthsold child, , who suffered a 4 day illness, unspecific at the beginning, but during her last day showed signs of tissue hipoperfusion, had 2 cardicac arrests and died. The forensic autopsy and histological examination demonstrated great vessels vasculitis. This findings are compatible with Takayasu’s arteritis. Takayasu is a very uncommon disease in the occidental hemisphere, and is also unusual in caucasic children and uncommonly has a lethal outcome.
Bienestar Animal: Comportamiento productivo y salud de las crías de cerdos alojadas en tecnología Flat Deck - Animal Well-being: Productive behaviour and health of the breeding of pigs housed in technology Flat Deck
Maikel Díaz Gutierrez,Yunier Hernández Cruz
REDVET , 2010,
Abstract: ResumenCon el objetivo de evaluar comportamiento productivo y de salud de las crías de cerdos alojados en tecnología Flat Deck se realiza el trabajo Bienestar Animal: Comportamiento productivo y de salud de las crías de cerdos alojadas en tecnología Flat Deck. Para ello se utilizaron 24 bóxer de maternidad de tecnología Flat Deck, de estos 12 de origen chino y 12 de origen espa ol con características similares. Se analizaron un total de 1433 crías mestizas (cruce de hembras Yorkland entre la tercera y cuarta paridad con machos CC-21, L-35 y Duroc). De estas, 715 corresponden a la tecnología de origen chino y 718 a la tecnología de origen espa ol, alojadas aproximadamente a 10 crías por bóxer. Se tuvo en cuenta el tama o de la camada al nacer (TCN) y peso al nacer (PN), peso al destete(PD) y ganancia media diaria (GMD); además de los indicadores de salud(enfermos y muertes) por tecnología. En los indicadores evaluadosinicialmente que no son influenciados por las tecnologías no sepresentaron diferencias estadísticamente significativas (p>0,05). En los indicadores productivos por tecnología no se encontraron diferencia estadísticamente significativa, encontrándose las medias del peso al destete entre 7.08 y 7.15 y una ganancia media diaria de 219.11 y 221.09 respectivamente. No siendo así para los indicadores de salud, quien fue desfavorable para la tecnología de origen chino donde se presentaron 27 animales enfermos por encima de los enfermos en la tecnología de origen espa ol.SummaryWith the objective of evaluating productive behaviour and of health of the breeding of pigs housed in technology Flat Deck he/she is carried out the work Animal Well-being: Productive behaviour and of health of the breeding of pigs housed in technology Flat Deck. For they were used it 24 boxers of technology maternity Flat Deck, of these 12 of Chinese origin and 12 of Spanish origin with characteristic similar. They were analyzed a total of 1433 breeding matzos (cross of female Yorkland between the third and quarter parity with males CC-21, L-35 and Duroc). Of these, 715 correspond at the technology of Chinese origin and 718 to the technology of Spanish origin, housed 10 breeding approximately by boxer. One kept in mind the size from the litter when being born (TCN) and I weigh when being born (PN), I weigh to the weaning (PD) and half daily (GMD) gain; besides the indicators of health (sick and deaths) for technology. In the indicators evaluated initially that they are not influenced by the technologies they didn't show up differences statisticallysignificant (p > 0,05). In
A First Principles Density Functional Study of Au Deposition on TiN (001) Surface
Norge Cruz Hernández,Javier Fdez. Sanz
International Journal of Molecular Sciences , 2001, DOI: 10.3390/i2050263
Abstract: The structure and local electron properties of Au atoms deposited on the TiN (001) surface has been theoretically analyzed using a periodic slab model and density functional based calculations. The surface is described by means of a 2x2 cell five layers thick, on which gold atoms are added. Deposition of single atoms on the surface, (θ = 0.25 ML), shows that the preferred site is on-top of Ti atoms, with a metal-surface distance of 2.49 ?. The computed adsorption energy for this site is -1.92 eV, only slightly lower than that lying between two Ti surface atoms (-1.90 eV). The on-top nitrogen sites are less favorable by about 0.4 eV. The calculations were carried out using the Perdew-Wang 91 exchange correlation functional and ultra soft pseudopotentials, with electronic states represented by a plane-wave expansion.
EEGcorco: a computer program to simultaneously calculate and statistically analyze EEG coherence and correlation  [PDF]
Miguel Angel Guevara, Marisela Hernández-González, Araceli Sanz-Martin, Claudia Amezcua
Journal of Biomedical Science and Engineering (JBiSE) , 2011, DOI: 10.4236/jbise.2011.412096
Abstract: EEGcorco is a computer program designed to analyze the degree of synchronization between two electroencephalographic signals (EEG) by mean the analysis of correlation and coherence index. The correlation and coherence values permit the quantitative determination of the similarity among EEG signals from homologous areas of the cerebral hemispheres (interhemispheric), and among localized areas within one cerebral hemisphere (intrahemispheric). EEG coherence is a function of frequency; thus it is commonly presented in a spectral manner (coherence values in every frequency of the spectrum), in contrast, the correlation function has been employed mainly to search periodic components of bioelectrical signals, and normally appears as punctual values defined in time, hence it is not common calculate correlation spectra. EEGcorco offers an easy and novel way to calculate correlation spectra by mean the application of the Fast Fourier Transformation (FFT) to digitized EEG signals. Both, correlation and coherence spectra are obtained in both independent frequencies and frequencies grouped in wide bands. Moreover, the program applies parametric statistical analyses to those coherence and correlation spectra also, for each individual frequency and for the frequencies grouped in bands. The program functions on any PC-compatible computer equipped with a Pentium or superior processor and a minimum of 512 Mb of RAM memory (though the higher the capacity the better). The space required on the hard disk depends on the signals to be analyzed, as the output takes the form of files in text format that occupy very little space. The program has been elaborated completely in the Delphi environment for the Windows operating system. The efficacy and versatility of EEGcorco allow it to be easily adapted to different experimental and clinical needs.
EEGbands: A Computer Program to Statistically Analyze Parameters of Electroencephalographic Signals  [PDF]
Miguel Angel Guevara, Araceli Sanz-Martin, Marisela Hernández-González
Journal of Behavioral and Brain Science (JBBS) , 2014, DOI: 10.4236/jbbs.2014.47032
Abstract: The quantitative analysis of electroencephalographic activity (EEG) is a useful tool for the study of changes in brain electrical activity during cognitive and behavioral functions in several experimental conditions. Their recording and analysis are currently carried out primarily through the use of computer programs. This paper presents a computerized program (EEGbands) created for Windows operating systems using the Delphi language, and designed to analyze EEG signals and facilitate their quantitative exploration. EEGbands applies Rapid Fourier Transformation to the EEG signals of one or more groups of subjects to obtain absolute and relative power spectra. It also calculates both interhemispheric and intrahemispheric correlation and coherence spectra and, finally, applies parametrical statistical analysis to these spectral parameters calculated for wide frequency EEG bands. Unlike other programs, EEGbands is simple and inexpensive, and rapidly and precisely generates results files with the corresponding statistical significances. The efficacy and versatility of EEGbands allow it to be easily adapted to different experimental and clinical needs.
RompecPC: A computerized program to create and solve jigsaw puzzles  [PDF]
Miguel Angel Guevara, Marai Pérez Hernández, Marisela Hernández González, Araceli Sanz-Martin, Sonia Ramírez Zapata
Journal of Biomedical Science and Engineering (JBiSE) , 2013, DOI: 10.4236/jbise.2013.67088
Abstract: RompecPC is a computerized program designed to create and assemble jigsaw puzzles. The program automatically records the solver’s responses as the number of pieces positioned correctly, the number of correct and incorrect movements, the number of times that she/he attempts to move a piece to the same place (perseverations), and the latency and place to which each piece is moved or attempted to be moved. These features facilitate the implementation and evaluation of puzzles while also reducing human error. Therefore, RompePC is a useful tool for the neuropsychological assessment of visuospatial skills in both clinical and experimental research.
Revisión por aguja de la bula de filtración, una alternativa terapéutica en pacientes trabeculectomizados Needle review of the filtering bleb as an alternative in the treatment of patients undergoing trabeculectomy
Elizabeth Arzuaga Hernández,Francisco Fumero González,Sahiris González Piloto,Maikel Batista Pe?a
Revista Cubana de Oftalmolog?-a , 2012,
Abstract: La trabeculectomía es generalmente un procedimiento exitoso para reducir la presión intraocular en pacientes con glaucoma. Sin embargo, el fallo de la ampolla de filtración puede ocurrir y provocar un incremento de la presión intraocular. Esto conllevaría a una intervención médica o quirúrgica adicional. Se realiza una revisión bibliográfica sobre la cistitomía transconjuntival, asociada al uso de antimetabolitos (mitomicina C o 5-fluorouracilo) o no. Se demuestra que es mínimamente invasiva, con escasas complicaciones y que constituye un método eficaz, fácil y barato para restablecer el drenaje acuoso y disminuir la presión intraocular. Trabeculectomy is usually a successful procedure to reduce intraocular pressure in glaucoma patients. However, the failure of the filtering bleb can occur, leading to increased intraocular pressure and to a further medical or surgical intervention. A literature review on transconjunctival cystotomy, with or without the use of mitomycin C or 5-fluorouracil, was made. It was demonstrated that this method is minimally invasive with few complications, effective, easy-to-apply and inexpensive to restore aqueous drainage and lowering intraocular pressure.
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