Julian Echeverry - Academia.edu (original) (raw)
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Papers by Julian Echeverry
The Journal of microwave power and electromagnetic energy : a publication of the International Microwave Power Institute, 2010
This paper describes analytical and experimental work developed to evaluate the effects of the el... more This paper describes analytical and experimental work developed to evaluate the effects of the electromagnetic fields produced by high-voltage lines (400kV) on wireless data transmission at the 900MHz band. In this work the source of the data transmission is located inside the electromagnetic field and the reception station is located at different distances from the power lines. Different atmospheric conditions are considered.
Se presenta en este trabajo una metodología de caracterización basada en la representación tiempo... more Se presenta en este trabajo una metodología de caracterización basada en la representación tiempo frecuencia de las señales fonocardiográficas con el fin de hacer reconocimiento de valvulopatías cardíacas. La naturaleza de estas patologías las hace susceptibles a ser caracterizadas ...
Database and Expert Systems Applications, 2010
This work is focused on the context of speech interfaces for controlling household electronic dev... more This work is focused on the context of speech interfaces for controlling household electronic devices. In particular, we present an example of a spoken dialogue system for controlling a Hi-Fi audio system. This system demonstrates that a more natural, flexible and robust dialogue is possible. That is due to both the Bayesian Networks based solution that we propose for dialogue modeling, and also to carefully designed contextual information handling strategies.
Introduction and objective: Tooth decay is one of the most prevalent infectious diseases of the o... more Introduction and objective:
Tooth decay is one of the most prevalent infectious diseases of the oral cavity. The aim of this study was to determine the prevalence of Streptoccocus mutans and its genotypes in saliva samples from 6 and 7 year old children with and without dental caries.
Materials and methods:
Forty seven saliva samples were obtained from 6-7 year-old children, randomly selected from a Public School in Medellin, Colombia. Oral examinations in order to determine the DMF-T Index (Decay, Missing and Filling Teeth) were carried out. Isolates were identified by the Streptoccocus sobrinus and Streptococcus mutans PCR, API 20STREP and 16S rRNA sequence analysis. Genotypes c, e, f and k were detected by PCR.
Results:
Prevalence of S. mutans was 14.9%. Of the 47 saliva samples, 57.4% (27) corresponded to children with dental caries, and 8.5% (4) were positive for S. mutans genotype c, 2.1% (1 each) genotype f, genotype k, and genotype c and k, respectively.
Conclusion:
Prevalence of S. mutans was lower than in previous studies of Colombian children with similar demographic characteristics. Streptoccocus mutans genotype c, f and k were found in children with caries but not in the group without caries. This is the first report of S. mutans genotype k in Colombia; this genotype requires further study to clarify its relation with dental caries and cardiovascular disease in Colombia.
The Journal of microwave power and electromagnetic energy : a publication of the International Microwave Power Institute, 2010
This paper describes analytical and experimental work developed to evaluate the effects of the el... more This paper describes analytical and experimental work developed to evaluate the effects of the electromagnetic fields produced by high-voltage lines (400kV) on wireless data transmission at the 900MHz band. In this work the source of the data transmission is located inside the electromagnetic field and the reception station is located at different distances from the power lines. Different atmospheric conditions are considered.
Se presenta en este trabajo una metodología de caracterización basada en la representación tiempo... more Se presenta en este trabajo una metodología de caracterización basada en la representación tiempo frecuencia de las señales fonocardiográficas con el fin de hacer reconocimiento de valvulopatías cardíacas. La naturaleza de estas patologías las hace susceptibles a ser caracterizadas ...
Database and Expert Systems Applications, 2010
This work is focused on the context of speech interfaces for controlling household electronic dev... more This work is focused on the context of speech interfaces for controlling household electronic devices. In particular, we present an example of a spoken dialogue system for controlling a Hi-Fi audio system. This system demonstrates that a more natural, flexible and robust dialogue is possible. That is due to both the Bayesian Networks based solution that we propose for dialogue modeling, and also to carefully designed contextual information handling strategies.
Introduction and objective: Tooth decay is one of the most prevalent infectious diseases of the o... more Introduction and objective:
Tooth decay is one of the most prevalent infectious diseases of the oral cavity. The aim of this study was to determine the prevalence of Streptoccocus mutans and its genotypes in saliva samples from 6 and 7 year old children with and without dental caries.
Materials and methods:
Forty seven saliva samples were obtained from 6-7 year-old children, randomly selected from a Public School in Medellin, Colombia. Oral examinations in order to determine the DMF-T Index (Decay, Missing and Filling Teeth) were carried out. Isolates were identified by the Streptoccocus sobrinus and Streptococcus mutans PCR, API 20STREP and 16S rRNA sequence analysis. Genotypes c, e, f and k were detected by PCR.
Results:
Prevalence of S. mutans was 14.9%. Of the 47 saliva samples, 57.4% (27) corresponded to children with dental caries, and 8.5% (4) were positive for S. mutans genotype c, 2.1% (1 each) genotype f, genotype k, and genotype c and k, respectively.
Conclusion:
Prevalence of S. mutans was lower than in previous studies of Colombian children with similar demographic characteristics. Streptoccocus mutans genotype c, f and k were found in children with caries but not in the group without caries. This is the first report of S. mutans genotype k in Colombia; this genotype requires further study to clarify its relation with dental caries and cardiovascular disease in Colombia.