David Baez - Academia.edu (original) (raw)

Papers by David Baez

Research paper thumbnail of MATLAB® Handbook with Applications to Mathematics, Science, Engineering, and Finance

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Research paper thumbnail of A modified fully biquadratic state-variable KHN filter using only 3 op-amps

Proceedings of Canadian Conference on Electrical and Computer Engineering CCECE-94, 1994

We present a modified KHN filter which is able to realize any kind of biquadratic function and on... more We present a modified KHN filter which is able to realize any kind of biquadratic function and only needs three op-amps, resulting in the saving of an op-amp. Its usefulness is noted when we realize second order all-pass, band-reject or elliptic functions

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Research paper thumbnail of Simulador de Tramas de Comunicación de AMPS y GSM (SITCAG)

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Research paper thumbnail of Harmonic Distortion in Switched Current Cells Due to Settling Error

Analog Integrated Circuits and Signal Processing, 2004

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Research paper thumbnail of GENESIS: an educational tool for integrated circuit system generation

FIE '98. 28th Annual Frontiers in Education Conference. Moving from 'Teacher-Centered' to 'Learner-Centered' Education. Conference Proceedings (Cat. No.98CH36214)

Summary form only given. In this paper, the authors present an educational software package for t... more Summary form only given. In this paper, the authors present an educational software package for the generation, schematic capture, simulation, optimization and layout description of integrated electronic systems. This system works in an environment (framework) that manipulates each of the tools. The main characteristic of this system is that the hierarchic method is used and students can make top-down designs starting from a system definition up to the physical description layout of the devices needed in the integrated circuit.

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Research paper thumbnail of MATLAB Applications in Finance

MATLAB with Applications to Engineering, Physics and Finance

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Research paper thumbnail of A Feature Extraction Method Based on the Pattern Spectrum for Hand Shape Biometry

In this paper a novel feature extraction methodology based on the morphological pattern spectrum ... more In this paper a novel feature extraction methodology based on the morphological pattern spectrum or pecstrum, for a hand-shape biometric system is proposed. The image of the right hand of a subject is captured in an unconstrained pose, with a commercial flatbed scanner. The invariance to rotation and position properties of the pecstrum allow the system to avoid a fixed hand position using pegs, as is the case in other reported systems. Identification experiments were carried out using the obtained feature vectors as the input to some recognition systems based on distance classifiers, neural networks, and support vector machines, for comparison purposes. The verification case was analyzed through an Euclidean distance classifier, obtaining the acceptance rate (FAR) and false rejection rate (FRR) of the system for some K-fold cross validation experiments. In average, an Equal Error Rate of 2.31 % was obtained. The results indicate that the pattern spectrum represents a good alternativ...

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Research paper thumbnail of Diagnostic accuracy of clinical visualization and light-based tests in precancerous and cancerous lesions of the oral cavity and oropharynx: a systematic review and meta-analysis

Clinical Oral Investigations

Objective Evaluate and compare the performance of autofluorescence, chemiluminescence, and clinic... more Objective Evaluate and compare the performance of autofluorescence, chemiluminescence, and clinical visual examination in the detection of oral potentially malignant disorders (OPMD), oral cancer (OC), and oropharyngeal cancer (OPC). Materials and methods A systematic review with meta-analysis based on diagnostic test studies. A literature search was carried out in the MEDLINE and EMBASE databases through August 30, 2020. For this review, the quality assessment tool of diagnostic precision studies (QUADAS-2) was used. Hierarchical regression models were used to estimate pooled diagnostic precision values in a random effects model. Results A total of 40 studies were identified for this review according to each test evaluated: 5.562 samples for autofluorescence, 1.353 samples for chemiluminescence, and 1.892 samples for clinical examination. The summary measures sensitivity and specificity of the clinical examination were 63% and 78%, respectively, AUC = 0.78 95% CI (0.74–0.81). In the autofluorescence test, these were 86% and 72%, respectively, AUC = 0.86 95% CI (0.83–0.89); and the chemiluminescent test were 67% and 48%, respectively, AUC = 0.59 95% CI (0.54–0.63) Conclusions Autofluorescence devices displayed superior accuracy levels in the identification of premalignant lesions and early neoplastic changes compared to clinical examination and chemiluminescent test. Overall, biopsy remains the gold standard for the definitive diagnosis of OPMD, OC, and OPC. Clinical Relevance Light-based clinical methods such as autofluorescence and chemiluminescence techniques have been used in clinical diagnosis for the differentiation of OPMD and malignant and benign lesions; although detailed visual examination appears to be effective in identifying, previous systematic reviews have not evaluated a relevant number of studies and they did not evaluate the accuracy of the clinical examination.

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Research paper thumbnail of A Biometric System Based on Neural Networks and SVM Using Morphological Feature Extraction from Hand-Shape Images

Informatica

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Research paper thumbnail of Condiciones en C++

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Research paper thumbnail of UDLAP: Sentiment Analysis Using a Graph-Based Representation

Proceedings of the 9th International Workshop on Semantic Evaluation (SemEval 2015), 2015

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Research paper thumbnail of One small step for machines, one giant leap for Mexico: a local history of computing

IEEE Annals of the History of Computing, 2015

This article presents a brief history of how computing started and evolved in Mexico. From the fi... more This article presents a brief history of how computing started and evolved in Mexico. From the first computer installed in 1958 to the present day, the authors analyze the role computer science has played in Mexico, looking at its limitations, opportunities, academic programs, government, and related industries as the motor of computer science development. They describe how research has gone from an approach centered only on applications development to the creation of research institutions granting advanced degrees and a growing community of researchers.

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Research paper thumbnail of Simulacion De Tramas De Comunicación De Los Sistemas GSM a De S y Acrónimos

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Research paper thumbnail of A novel modification scheme for the state variable filter to improve its high frequency performance

1997 IEEE Pacific Rim Conference on Communications, Computers and Signal Processing, PACRIM. 10 Years Networking the Pacific Rim, 1987-1997, 1997

Abstract The state variable filter, also known as the KHN filter, is well known for its low sensi... more Abstract The state variable filter, also known as the KHN filter, is well known for its low sensitivities to the passive elements. However, its sensitivities to the finite gain product of the operational amplifiers limit its performance for high frequencies. We propose a new ...

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Research paper thumbnail of Simulation and experimental results for a compact fluorescent lamp with electronic adapter

38th Midwest Symposium on Circuits and Systems. Proceedings, 1996

SIMULATION AND EXPERIMENTAL RESULTS FOR A COMPACT FLUORESCENT LAMP WITH ELECTRONIC ADAPTER Oscar ... more SIMULATION AND EXPERIMENTAL RESULTS FOR A COMPACT FLUORESCENT LAMP WITH ELECTRONIC ADAPTER Oscar Montero, DavidBdez, Fernando Alvarez, Rubin Alejos* Departamento de Ingenieria Electronica1 Universidad de Las Americas A P. 100 CP, 72820 Cholula, ...

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Research paper thumbnail of Multimedia tutorial on operational amplifiers, fundamentals, and applications

FIE '98. 28th Annual Frontiers in Education Conference. Moving from 'Teacher-Centered' to 'Learner-Centered' Education. Conference Proceedings (Cat. No.98CH36214), 1998

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Research paper thumbnail of Electronic automotive requirement design space - a bird\u2019s eye view of a strategic requirement design space exploration

International Conference on Informatics in Control, Automation and Robotics, 2005

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Research paper thumbnail of The Bernstein filter-a new class of linear phase filter approximation

[1991] Proceedings of the 34th Midwest Symposium on Circuits and Systems, 1992

Abstract A class of linear phase analog filter approximation based on the Bernstein polynomials i... more Abstract A class of linear phase analog filter approximation based on the Bernstein polynomials is presented. The advantages obtained using this approximation when compared to the Thomson approximation include the fact that the group delay can be ...

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Research paper thumbnail of Software for simulation in the introductory electrical engineering course

Proceedings of 36th Midwest Symposium on Circuits and Systems, 1993

Students at the very first electrical engineering course begin to get acquainted with the bare ba... more Students at the very first electrical engineering course begin to get acquainted with the bare basic material in the field. Thus, solving a circuit, aside from a small resistive circuit, is more than impossible. Fortunately, students have access to simulators like SPICE which can help them solve more complex circuits to observe the behaviour under different excitation inputs. This work describes a software interface that helps one to use a SPICE simulator without having any knowledge about the simulator syntax and requiring no previous training on the interface

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Research paper thumbnail of Linear phase IIR digital filters using the Bernstein polynomial

[Proceedings] ICASSP 91: 1991 International Conference on Acoustics, Speech, and Signal Processing, 1991

Abstract The author presents a technique for the design of digital recursive linear phase filters... more Abstract The author presents a technique for the design of digital recursive linear phase filters by means of Bernstein polynomials designed in the analog domain and then transformed into the digital domain through the bilinear transform. Results are presented ...

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Research paper thumbnail of MATLAB® Handbook with Applications to Mathematics, Science, Engineering, and Finance

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Research paper thumbnail of A modified fully biquadratic state-variable KHN filter using only 3 op-amps

Proceedings of Canadian Conference on Electrical and Computer Engineering CCECE-94, 1994

We present a modified KHN filter which is able to realize any kind of biquadratic function and on... more We present a modified KHN filter which is able to realize any kind of biquadratic function and only needs three op-amps, resulting in the saving of an op-amp. Its usefulness is noted when we realize second order all-pass, band-reject or elliptic functions

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Research paper thumbnail of Simulador de Tramas de Comunicación de AMPS y GSM (SITCAG)

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Harmonic Distortion in Switched Current Cells Due to Settling Error

Analog Integrated Circuits and Signal Processing, 2004

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Research paper thumbnail of GENESIS: an educational tool for integrated circuit system generation

FIE '98. 28th Annual Frontiers in Education Conference. Moving from 'Teacher-Centered' to 'Learner-Centered' Education. Conference Proceedings (Cat. No.98CH36214)

Summary form only given. In this paper, the authors present an educational software package for t... more Summary form only given. In this paper, the authors present an educational software package for the generation, schematic capture, simulation, optimization and layout description of integrated electronic systems. This system works in an environment (framework) that manipulates each of the tools. The main characteristic of this system is that the hierarchic method is used and students can make top-down designs starting from a system definition up to the physical description layout of the devices needed in the integrated circuit.

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Research paper thumbnail of MATLAB Applications in Finance

MATLAB with Applications to Engineering, Physics and Finance

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Research paper thumbnail of A Feature Extraction Method Based on the Pattern Spectrum for Hand Shape Biometry

In this paper a novel feature extraction methodology based on the morphological pattern spectrum ... more In this paper a novel feature extraction methodology based on the morphological pattern spectrum or pecstrum, for a hand-shape biometric system is proposed. The image of the right hand of a subject is captured in an unconstrained pose, with a commercial flatbed scanner. The invariance to rotation and position properties of the pecstrum allow the system to avoid a fixed hand position using pegs, as is the case in other reported systems. Identification experiments were carried out using the obtained feature vectors as the input to some recognition systems based on distance classifiers, neural networks, and support vector machines, for comparison purposes. The verification case was analyzed through an Euclidean distance classifier, obtaining the acceptance rate (FAR) and false rejection rate (FRR) of the system for some K-fold cross validation experiments. In average, an Equal Error Rate of 2.31 % was obtained. The results indicate that the pattern spectrum represents a good alternativ...

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Research paper thumbnail of Diagnostic accuracy of clinical visualization and light-based tests in precancerous and cancerous lesions of the oral cavity and oropharynx: a systematic review and meta-analysis

Clinical Oral Investigations

Objective Evaluate and compare the performance of autofluorescence, chemiluminescence, and clinic... more Objective Evaluate and compare the performance of autofluorescence, chemiluminescence, and clinical visual examination in the detection of oral potentially malignant disorders (OPMD), oral cancer (OC), and oropharyngeal cancer (OPC). Materials and methods A systematic review with meta-analysis based on diagnostic test studies. A literature search was carried out in the MEDLINE and EMBASE databases through August 30, 2020. For this review, the quality assessment tool of diagnostic precision studies (QUADAS-2) was used. Hierarchical regression models were used to estimate pooled diagnostic precision values in a random effects model. Results A total of 40 studies were identified for this review according to each test evaluated: 5.562 samples for autofluorescence, 1.353 samples for chemiluminescence, and 1.892 samples for clinical examination. The summary measures sensitivity and specificity of the clinical examination were 63% and 78%, respectively, AUC = 0.78 95% CI (0.74–0.81). In the autofluorescence test, these were 86% and 72%, respectively, AUC = 0.86 95% CI (0.83–0.89); and the chemiluminescent test were 67% and 48%, respectively, AUC = 0.59 95% CI (0.54–0.63) Conclusions Autofluorescence devices displayed superior accuracy levels in the identification of premalignant lesions and early neoplastic changes compared to clinical examination and chemiluminescent test. Overall, biopsy remains the gold standard for the definitive diagnosis of OPMD, OC, and OPC. Clinical Relevance Light-based clinical methods such as autofluorescence and chemiluminescence techniques have been used in clinical diagnosis for the differentiation of OPMD and malignant and benign lesions; although detailed visual examination appears to be effective in identifying, previous systematic reviews have not evaluated a relevant number of studies and they did not evaluate the accuracy of the clinical examination.

Bookmarks Related papers MentionsView impact

Research paper thumbnail of A Biometric System Based on Neural Networks and SVM Using Morphological Feature Extraction from Hand-Shape Images

Informatica

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Research paper thumbnail of Condiciones en C++

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Research paper thumbnail of UDLAP: Sentiment Analysis Using a Graph-Based Representation

Proceedings of the 9th International Workshop on Semantic Evaluation (SemEval 2015), 2015

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Research paper thumbnail of One small step for machines, one giant leap for Mexico: a local history of computing

IEEE Annals of the History of Computing, 2015

This article presents a brief history of how computing started and evolved in Mexico. From the fi... more This article presents a brief history of how computing started and evolved in Mexico. From the first computer installed in 1958 to the present day, the authors analyze the role computer science has played in Mexico, looking at its limitations, opportunities, academic programs, government, and related industries as the motor of computer science development. They describe how research has gone from an approach centered only on applications development to the creation of research institutions granting advanced degrees and a growing community of researchers.

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Research paper thumbnail of Simulacion De Tramas De Comunicación De Los Sistemas GSM a De S y Acrónimos

Bookmarks Related papers MentionsView impact

Research paper thumbnail of A novel modification scheme for the state variable filter to improve its high frequency performance

1997 IEEE Pacific Rim Conference on Communications, Computers and Signal Processing, PACRIM. 10 Years Networking the Pacific Rim, 1987-1997, 1997

Abstract The state variable filter, also known as the KHN filter, is well known for its low sensi... more Abstract The state variable filter, also known as the KHN filter, is well known for its low sensitivities to the passive elements. However, its sensitivities to the finite gain product of the operational amplifiers limit its performance for high frequencies. We propose a new ...

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Research paper thumbnail of Simulation and experimental results for a compact fluorescent lamp with electronic adapter

38th Midwest Symposium on Circuits and Systems. Proceedings, 1996

SIMULATION AND EXPERIMENTAL RESULTS FOR A COMPACT FLUORESCENT LAMP WITH ELECTRONIC ADAPTER Oscar ... more SIMULATION AND EXPERIMENTAL RESULTS FOR A COMPACT FLUORESCENT LAMP WITH ELECTRONIC ADAPTER Oscar Montero, DavidBdez, Fernando Alvarez, Rubin Alejos* Departamento de Ingenieria Electronica1 Universidad de Las Americas A P. 100 CP, 72820 Cholula, ...

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Research paper thumbnail of Multimedia tutorial on operational amplifiers, fundamentals, and applications

FIE '98. 28th Annual Frontiers in Education Conference. Moving from 'Teacher-Centered' to 'Learner-Centered' Education. Conference Proceedings (Cat. No.98CH36214), 1998

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Research paper thumbnail of Electronic automotive requirement design space - a bird\u2019s eye view of a strategic requirement design space exploration

International Conference on Informatics in Control, Automation and Robotics, 2005

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Research paper thumbnail of The Bernstein filter-a new class of linear phase filter approximation

[1991] Proceedings of the 34th Midwest Symposium on Circuits and Systems, 1992

Abstract A class of linear phase analog filter approximation based on the Bernstein polynomials i... more Abstract A class of linear phase analog filter approximation based on the Bernstein polynomials is presented. The advantages obtained using this approximation when compared to the Thomson approximation include the fact that the group delay can be ...

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Research paper thumbnail of Software for simulation in the introductory electrical engineering course

Proceedings of 36th Midwest Symposium on Circuits and Systems, 1993

Students at the very first electrical engineering course begin to get acquainted with the bare ba... more Students at the very first electrical engineering course begin to get acquainted with the bare basic material in the field. Thus, solving a circuit, aside from a small resistive circuit, is more than impossible. Fortunately, students have access to simulators like SPICE which can help them solve more complex circuits to observe the behaviour under different excitation inputs. This work describes a software interface that helps one to use a SPICE simulator without having any knowledge about the simulator syntax and requiring no previous training on the interface

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Linear phase IIR digital filters using the Bernstein polynomial

[Proceedings] ICASSP 91: 1991 International Conference on Acoustics, Speech, and Signal Processing, 1991

Abstract The author presents a technique for the design of digital recursive linear phase filters... more Abstract The author presents a technique for the design of digital recursive linear phase filters by means of Bernstein polynomials designed in the analog domain and then transformed into the digital domain through the bilinear transform. Results are presented ...

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