Resumo: A presente pesquisa pretende analisar e discutir como as trocas dialogicas ente professor... more Resumo: A presente pesquisa pretende analisar e discutir como as trocas dialogicas ente professor e alunos influenciam na aprendizagem de conceitos matematicos ao utilizar um Objeto de Aprendizagem denominado Balanca Interativa. A pesquisa foi realizada numa escola da rede publica municipal da cidade de Fortaleza com uma turma de vinte e seis alunos de 7a serie e seu professor de matematica. Os dados preliminares da pesquisa ja indicam evidencias da importância das trocas dialogicas para aprendizagem de conceitos matematicos. Abstract: The present research aims to analyze how dialogical exchanges between students and teacher influences the learning of mathematical concepts while using a Learning Object called Interactive Scale. The research was conducted in a public school in the city of Fortaleza, Brazil with twenty- six 7th grade students and their mathematics teacher. Preliminary data had shown evidence of the importance of dialogical exchanges for the learning of mathematical co...
This article presents research conclusions about how the Free Trade Agreement with USA could impa... more This article presents research conclusions about how the Free Trade Agreement with USA could impact the micro and small clothes makers’ finance. Furthermore, it presents the results of a survey among a group of micro and small clothes makers from Gamarra Street.
The Journal of Defense Modeling and Simulation: Applications, Methodology, Technology, 2005
It is widely accepted that acquisition of the knowledge behind military tactics has been one limi... more It is widely accepted that acquisition of the knowledge behind military tactics has been one limiting factor in the development of computer generated forces (CGF) for training simulations. This has been addressed by several researchers with varying degrees of success. A system capable of building a knowledge base directly from a dialogue with a subjectmatter expert (SME) could significantly reduce the human effort involved in capturing the knowledge and representing it directly in the modeling language. Because of its highly modular and hierarchical nature, the context-based reasoning (CxBR) modeling paradigm lends itself very well to facilitating the knowledge acquisition process for tactical behaviors. This paper describes an investigation into using CxBR as the foundation for a system that creates a (partial) model of tactical behavior through an interactive process with an SME. Through a sequence of queries from the system, the SME is progressively asked to provide details about the contexts that compose the context-based model of the expert's tactical know-how. A prototype was built and evaluated. A comparison to the effort taken to manually develop a knowledge base is reported. We use the simulation of a non-trivial maritime military confrontation as the benchmark for the comparisons.
We experimentally demonstrate a novel grating which only produces reflection with mode conversion... more We experimentally demonstrate a novel grating which only produces reflection with mode conversion in a two-mode waveguide. That characteristic can improve the performance of optical devices that currently use tilted Bragg gratings to provide the mode conversion. Tilted Bragg gratings produce also reflections without mode conversion which increases noise and crosstalk of the optical device.
High and Low Concentrator Systems for Solar Electric Applications V, 2010
ABSTRACT Abstract In this presentation we evaluate the energy collection efficiency and energy yi... more ABSTRACT Abstract In this presentation we evaluate the energy collection efficiency and energy yield of different holographic planar concentrator designs. The holographic planar concentrator replaces expensive photovoltaic cell material with holographic collectors that cost approximately 1% of the photovoltaic material. An analysis is performed using a combination of raytracing and coupled wave theory. Other loss factors such as Fresnel reflection and polarization are also incorporated. The performance of single gratings is optimized to maximize the spectral and angular bandwidth that matches the spectral responsivity of different photovoltaic devices. Multiple grating collectors are also modeled to maximize energy collection over the course of a year accommodating the movement of the sun. The results show that approximately half of the light illuminating the hologram can directly be collected by diffraction and directed to the photovoltaic cell. A test system is evaluated and the experimental results compare well with the analysis.
We address the problem of fusion in a facial component approach to face verification. In our stud... more We address the problem of fusion in a facial component approach to face verification. In our study the facial components are local image windows defined on a regular grid covering the face image. Gabor jets computed in each window provide face representation. A fusion architecture is proposed to combine the face verification evidence conveyed by each facial component. A novel modification of the linear discriminant analysis method is presented that improves fusion performance as well as providing a basis for feature selection. The potential of the method is demonstrated in experiments on the XM2VTS data base.
A new methodology describing the effects of aperiodic and multiplexed gratings in volume holograp... more A new methodology describing the effects of aperiodic and multiplexed gratings in volume holographic imaging systems (VHIS) is presented. The aperiodic gratings are treated as an ensemble of localized planar gratings using coupled wave methods in conjunction with sequential and non-sequential ray-tracing techniques to accurately predict volumetric diffraction effects in VHIS. Our approach can be applied to aperiodic, multiplexed gratings and used to theoretically predict the performance of multiplexed volume holographic gratings within a volume hologram for VHIS. We present simulation and experimental results for the aperiodic and multiplexed imaging gratings formed in PQ-PMMA at 488nm and probed with a spherical wave at 633nm. Simulation results based on our approach that can be easily implemented in ray-tracing packages such as Zemax ® are confirmed with experiments and show proof of consistency and usefulness of the proposed models.
Anesthesiologists typically rely on a subjective evaluation (&amp... more Anesthesiologists typically rely on a subjective evaluation ("syringe feel") of possible abnormal resistance to injection while performing a peripheral nerve block (PNB). A greater force required to perform the injection is believed to be associated with intraneural injection. The hypothesis of this study is that anesthesiologists vary in their perception of…
Minimizing mold deflection is essential when manufacturing plastic parts to tight tolerances. Bot... more Minimizing mold deflection is essential when manufacturing plastic parts to tight tolerances. Both the mold and the machine are compliant and deform upon loading, which can affect the part quality. Therefore, understanding mold deflection during injection molding is critical for determining the final geometry of the part. It is also critical for secondary processes such as the inmold coating process. This article presents work in quantifying both mold deflection during an injectionmolding cycle and the effect of machine compliance on mold behavior. The mold cavity pressure obtained using MoldFlowி was used as input for the subsequent finite element mold deflection analysis. Two different structural models were used: the first model included only the mold, the mold base units and the ejector platen; the second model included the effect of the injection-molding machine compliance. To validate the model, strain gage rosettes were placed on the mold and the machine. Validating experiments were conducted using process parameters identical to those used in the simulations. A comparison of the experimental and simulation results for both models is presented.
An innovative approach has been developed to fabricate composite parts with complicated geometry.... more An innovative approach has been developed to fabricate composite parts with complicated geometry. The part is first divided into several simple substructures and each substructure is produced by an optimal process. These preformed substructures are then assembled on a specially designed tool and transferred into a mold cavity for resin impregnation by structural reaction injection molding (SRIM). A composite link is used as an example in this study. The mold filling pattern is simulated using a 3-D computer model. The simulated results compared well with the experimental results when race tracking and fiber impingement effects were considered in the model.
The goal of this work was to investigate the effect of two stage pressure molding on the compress... more The goal of this work was to investigate the effect of two stage pressure molding on the compression molding of a sheet molding compound (SMC). It has been shown in previous studies that a rapid drop in pressure during SMC curing significantly reduced severity of sink marks. This study concentrated on a method of predicting the optimum time during curing to release pressure by examining material behavior through process data from in-mold sersors. A simple control scheme was them applied for automatic pressure release at the optimum time corresponding with the peak of the material expansion and the onset of the reaction exotherm.
A phase-contrast volume holographic imaging system for three-dimensional contrast enhancement is ... more A phase-contrast volume holographic imaging system for three-dimensional contrast enhancement is presented. The system utilizes a spatial filter placed on a conjugate plane to the volume holographic pupil to simultaneously enhance weak phase information at different depths within an object. The proposed system was validated with experimental image data obtained in mouse colon samples and quantitative measurements of modulation transfer function as well.
... Jose D. Pardo1, Jose. A. Castro1, Gilberto. P. Iseda1, Cesar. Torres M2, Lorenzo Mattos2. ...... more ... Jose D. Pardo1, Jose. A. Castro1, Gilberto. P. Iseda1, Cesar. Torres M2, Lorenzo Mattos2. ... REFERENCIAS [1] Cooley, JW, y Tukey, J., “An algorithm for machine computation of complex Fourier series”, Math comput. 19: 297-301, 1965 [2] DELGADO, Alberto. ...
Etravirine is the first non-nucleoside reverse transcriptase inhibitor (NNRTI) to be active again... more Etravirine is the first non-nucleoside reverse transcriptase inhibitor (NNRTI) to be active against human immunodeficiency virus with NNRTI mutations. To understand the unique features of etravirine and to evaluate its safety, efficacy, and optimal use. The structure and the mechanism of action of etravirine in blocking the reverse transcriptase enzyme and the preclinical, pharmacokinetic and pharmacodynamic studies were reviewed. The DUET Phase III clinical trials and the resistance profile of etravirine were evaluated. Etravirine has unique activity against most HIV isolates that are resistant to other NNRTIs. Unlike other NNRTIs, it has a higher genetic barrier to developing high-grade resistance. In the DUET studies, etravirine demonstrated virological efficacy superior to the control arms with comparable rates of adverse events with the exception of rash. Because of its effect on the cytochrome P450 system, there are important drug interactions that will need to be taken into consideration with its use.
Carbon fiber (CF) woven fabric (52% by weight) reinforced epoxy composite and carbon nanofiber (C... more Carbon fiber (CF) woven fabric (52% by weight) reinforced epoxy composite and carbon nanofiber (CNF, 12% by weight) paper coated on the surface of the CF/epoxy composite were fabricated by resin transfer molding (RTM). The surface erosion characteristics of molded CF composites were investigated by sand erosion test using silica particles with a size around 150 lm as the erodent. The eroded surfaces were examined by scanning electron microscopy (SEM) and weight loss. The CNF paper was able to provide a much stronger erosion resistance compared to the CF reinforced epoxy composites, which is attributed to the high strength of CNFs and their nanoscale structure. Finite element (FE) computer simulations were used to qualitative interpret the underlying mechanisms.
Resumo: A presente pesquisa pretende analisar e discutir como as trocas dialogicas ente professor... more Resumo: A presente pesquisa pretende analisar e discutir como as trocas dialogicas ente professor e alunos influenciam na aprendizagem de conceitos matematicos ao utilizar um Objeto de Aprendizagem denominado Balanca Interativa. A pesquisa foi realizada numa escola da rede publica municipal da cidade de Fortaleza com uma turma de vinte e seis alunos de 7a serie e seu professor de matematica. Os dados preliminares da pesquisa ja indicam evidencias da importância das trocas dialogicas para aprendizagem de conceitos matematicos. Abstract: The present research aims to analyze how dialogical exchanges between students and teacher influences the learning of mathematical concepts while using a Learning Object called Interactive Scale. The research was conducted in a public school in the city of Fortaleza, Brazil with twenty- six 7th grade students and their mathematics teacher. Preliminary data had shown evidence of the importance of dialogical exchanges for the learning of mathematical co...
This article presents research conclusions about how the Free Trade Agreement with USA could impa... more This article presents research conclusions about how the Free Trade Agreement with USA could impact the micro and small clothes makers’ finance. Furthermore, it presents the results of a survey among a group of micro and small clothes makers from Gamarra Street.
The Journal of Defense Modeling and Simulation: Applications, Methodology, Technology, 2005
It is widely accepted that acquisition of the knowledge behind military tactics has been one limi... more It is widely accepted that acquisition of the knowledge behind military tactics has been one limiting factor in the development of computer generated forces (CGF) for training simulations. This has been addressed by several researchers with varying degrees of success. A system capable of building a knowledge base directly from a dialogue with a subjectmatter expert (SME) could significantly reduce the human effort involved in capturing the knowledge and representing it directly in the modeling language. Because of its highly modular and hierarchical nature, the context-based reasoning (CxBR) modeling paradigm lends itself very well to facilitating the knowledge acquisition process for tactical behaviors. This paper describes an investigation into using CxBR as the foundation for a system that creates a (partial) model of tactical behavior through an interactive process with an SME. Through a sequence of queries from the system, the SME is progressively asked to provide details about the contexts that compose the context-based model of the expert's tactical know-how. A prototype was built and evaluated. A comparison to the effort taken to manually develop a knowledge base is reported. We use the simulation of a non-trivial maritime military confrontation as the benchmark for the comparisons.
We experimentally demonstrate a novel grating which only produces reflection with mode conversion... more We experimentally demonstrate a novel grating which only produces reflection with mode conversion in a two-mode waveguide. That characteristic can improve the performance of optical devices that currently use tilted Bragg gratings to provide the mode conversion. Tilted Bragg gratings produce also reflections without mode conversion which increases noise and crosstalk of the optical device.
High and Low Concentrator Systems for Solar Electric Applications V, 2010
ABSTRACT Abstract In this presentation we evaluate the energy collection efficiency and energy yi... more ABSTRACT Abstract In this presentation we evaluate the energy collection efficiency and energy yield of different holographic planar concentrator designs. The holographic planar concentrator replaces expensive photovoltaic cell material with holographic collectors that cost approximately 1% of the photovoltaic material. An analysis is performed using a combination of raytracing and coupled wave theory. Other loss factors such as Fresnel reflection and polarization are also incorporated. The performance of single gratings is optimized to maximize the spectral and angular bandwidth that matches the spectral responsivity of different photovoltaic devices. Multiple grating collectors are also modeled to maximize energy collection over the course of a year accommodating the movement of the sun. The results show that approximately half of the light illuminating the hologram can directly be collected by diffraction and directed to the photovoltaic cell. A test system is evaluated and the experimental results compare well with the analysis.
We address the problem of fusion in a facial component approach to face verification. In our stud... more We address the problem of fusion in a facial component approach to face verification. In our study the facial components are local image windows defined on a regular grid covering the face image. Gabor jets computed in each window provide face representation. A fusion architecture is proposed to combine the face verification evidence conveyed by each facial component. A novel modification of the linear discriminant analysis method is presented that improves fusion performance as well as providing a basis for feature selection. The potential of the method is demonstrated in experiments on the XM2VTS data base.
A new methodology describing the effects of aperiodic and multiplexed gratings in volume holograp... more A new methodology describing the effects of aperiodic and multiplexed gratings in volume holographic imaging systems (VHIS) is presented. The aperiodic gratings are treated as an ensemble of localized planar gratings using coupled wave methods in conjunction with sequential and non-sequential ray-tracing techniques to accurately predict volumetric diffraction effects in VHIS. Our approach can be applied to aperiodic, multiplexed gratings and used to theoretically predict the performance of multiplexed volume holographic gratings within a volume hologram for VHIS. We present simulation and experimental results for the aperiodic and multiplexed imaging gratings formed in PQ-PMMA at 488nm and probed with a spherical wave at 633nm. Simulation results based on our approach that can be easily implemented in ray-tracing packages such as Zemax ® are confirmed with experiments and show proof of consistency and usefulness of the proposed models.
Anesthesiologists typically rely on a subjective evaluation (&amp... more Anesthesiologists typically rely on a subjective evaluation ("syringe feel") of possible abnormal resistance to injection while performing a peripheral nerve block (PNB). A greater force required to perform the injection is believed to be associated with intraneural injection. The hypothesis of this study is that anesthesiologists vary in their perception of…
Minimizing mold deflection is essential when manufacturing plastic parts to tight tolerances. Bot... more Minimizing mold deflection is essential when manufacturing plastic parts to tight tolerances. Both the mold and the machine are compliant and deform upon loading, which can affect the part quality. Therefore, understanding mold deflection during injection molding is critical for determining the final geometry of the part. It is also critical for secondary processes such as the inmold coating process. This article presents work in quantifying both mold deflection during an injectionmolding cycle and the effect of machine compliance on mold behavior. The mold cavity pressure obtained using MoldFlowி was used as input for the subsequent finite element mold deflection analysis. Two different structural models were used: the first model included only the mold, the mold base units and the ejector platen; the second model included the effect of the injection-molding machine compliance. To validate the model, strain gage rosettes were placed on the mold and the machine. Validating experiments were conducted using process parameters identical to those used in the simulations. A comparison of the experimental and simulation results for both models is presented.
An innovative approach has been developed to fabricate composite parts with complicated geometry.... more An innovative approach has been developed to fabricate composite parts with complicated geometry. The part is first divided into several simple substructures and each substructure is produced by an optimal process. These preformed substructures are then assembled on a specially designed tool and transferred into a mold cavity for resin impregnation by structural reaction injection molding (SRIM). A composite link is used as an example in this study. The mold filling pattern is simulated using a 3-D computer model. The simulated results compared well with the experimental results when race tracking and fiber impingement effects were considered in the model.
The goal of this work was to investigate the effect of two stage pressure molding on the compress... more The goal of this work was to investigate the effect of two stage pressure molding on the compression molding of a sheet molding compound (SMC). It has been shown in previous studies that a rapid drop in pressure during SMC curing significantly reduced severity of sink marks. This study concentrated on a method of predicting the optimum time during curing to release pressure by examining material behavior through process data from in-mold sersors. A simple control scheme was them applied for automatic pressure release at the optimum time corresponding with the peak of the material expansion and the onset of the reaction exotherm.
A phase-contrast volume holographic imaging system for three-dimensional contrast enhancement is ... more A phase-contrast volume holographic imaging system for three-dimensional contrast enhancement is presented. The system utilizes a spatial filter placed on a conjugate plane to the volume holographic pupil to simultaneously enhance weak phase information at different depths within an object. The proposed system was validated with experimental image data obtained in mouse colon samples and quantitative measurements of modulation transfer function as well.
... Jose D. Pardo1, Jose. A. Castro1, Gilberto. P. Iseda1, Cesar. Torres M2, Lorenzo Mattos2. ...... more ... Jose D. Pardo1, Jose. A. Castro1, Gilberto. P. Iseda1, Cesar. Torres M2, Lorenzo Mattos2. ... REFERENCIAS [1] Cooley, JW, y Tukey, J., “An algorithm for machine computation of complex Fourier series”, Math comput. 19: 297-301, 1965 [2] DELGADO, Alberto. ...
Etravirine is the first non-nucleoside reverse transcriptase inhibitor (NNRTI) to be active again... more Etravirine is the first non-nucleoside reverse transcriptase inhibitor (NNRTI) to be active against human immunodeficiency virus with NNRTI mutations. To understand the unique features of etravirine and to evaluate its safety, efficacy, and optimal use. The structure and the mechanism of action of etravirine in blocking the reverse transcriptase enzyme and the preclinical, pharmacokinetic and pharmacodynamic studies were reviewed. The DUET Phase III clinical trials and the resistance profile of etravirine were evaluated. Etravirine has unique activity against most HIV isolates that are resistant to other NNRTIs. Unlike other NNRTIs, it has a higher genetic barrier to developing high-grade resistance. In the DUET studies, etravirine demonstrated virological efficacy superior to the control arms with comparable rates of adverse events with the exception of rash. Because of its effect on the cytochrome P450 system, there are important drug interactions that will need to be taken into consideration with its use.
Carbon fiber (CF) woven fabric (52% by weight) reinforced epoxy composite and carbon nanofiber (C... more Carbon fiber (CF) woven fabric (52% by weight) reinforced epoxy composite and carbon nanofiber (CNF, 12% by weight) paper coated on the surface of the CF/epoxy composite were fabricated by resin transfer molding (RTM). The surface erosion characteristics of molded CF composites were investigated by sand erosion test using silica particles with a size around 150 lm as the erodent. The eroded surfaces were examined by scanning electron microscopy (SEM) and weight loss. The CNF paper was able to provide a much stronger erosion resistance compared to the CF reinforced epoxy composites, which is attributed to the high strength of CNFs and their nanoscale structure. Finite element (FE) computer simulations were used to qualitative interpret the underlying mechanisms.
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