Pub Date : 2018-05-20DOI: 10.19053/01211129.v27.n48.2018.7982
Jairo A. Moreno-González, A. Alarcón-Aldana, M. Callejas-Cuervo
Advances in knowledge and technology in various fields of human life and, particularly, in sports have resulted in innovative systems for professional sportsmen training. Here, we designed an electromagnetic system for practicing indoor cycling; this system can precisely simulate on the track the ascents and descents that allow the users to feel like they are training outdoors. Furthermore, this system connects to a web application that allows access from any mobile device to predefine the training routines and thus improve the user experience.
{"title":"Implementation of an electromagnetic system for controlling resistance and speed in indoor cycling","authors":"Jairo A. Moreno-González, A. Alarcón-Aldana, M. Callejas-Cuervo","doi":"10.19053/01211129.v27.n48.2018.7982","DOIUrl":"https://doi.org/10.19053/01211129.v27.n48.2018.7982","url":null,"abstract":"Advances in knowledge and technology in various fields of human life and, particularly, in sports have resulted in innovative systems for professional sportsmen training. Here, we designed an electromagnetic system for practicing indoor cycling; this system can precisely simulate on the track the ascents and descents that allow the users to feel like they are training outdoors. Furthermore, this system connects to a web application that allows access from any mobile device to predefine the training routines and thus improve the user experience.","PeriodicalId":21428,"journal":{"name":"Revista Facultad De Ingenieria-universidad De Antioquia","volume":"26 1","pages":"27-34"},"PeriodicalIF":1.0,"publicationDate":"2018-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82034320","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-05-05DOI: 10.19053/01211129.V27.N48.2018.8073
Liliana María Arroyave-Muñoz, C. P. Ossa-Orozco
Tissue engineering (TE) seeks to improve the unsatisfactory development of implants and medical procedures to solve bone and cartilage injuries. TE aims at regenerating tissues using cell growth platforms (scaffolds), which may consist of natural polymers such as polyhydroxyalkanoate (PHA). PHA is an innovative material useful in medical applications due to its degradation capability and bacterial origin that allows large-scale production and control final properties. In this research, we developed commercial PHA scaffolds using the lyophilization technique with a factorial experimental design. We used dichloromethane as PHA solvent, tergitol as surfactant, and liquid nitrogen (N 2 ) for the freezing process. We characterized the PHA by Fourier-transform infrared spectroscopy (FTIR) and thermogravimetric analysis (TGA); and the scaffolds by scanning electron microscopy (SEM) and mechanical compression and hydrolysis degradation tests. The characterization of the PHA indicated that the material is a mixture of PHA and polylactic acid (PLA). The results showed a suitable pore distribution for migration of chondrocytes through the scaffold, in addition to a behavior similar to that of the articular cartilage, although it presented lower mechanical strength. Also, the scaffolds displayed mass loss in a non-linear way related to the percentage of PHA present in the sample. In conclusion, PHA scaffolds have a potential use in tissue engineering for restoring articular cartilage.
{"title":"Morphology, mechanical strength and degradation of polyhydroxyalkanoate scaffolds","authors":"Liliana María Arroyave-Muñoz, C. P. Ossa-Orozco","doi":"10.19053/01211129.V27.N48.2018.8073","DOIUrl":"https://doi.org/10.19053/01211129.V27.N48.2018.8073","url":null,"abstract":"Tissue engineering (TE) seeks to improve the unsatisfactory development of implants and medical procedures to solve bone and cartilage injuries. TE aims at regenerating tissues using cell growth platforms (scaffolds), which may consist of natural polymers such as polyhydroxyalkanoate (PHA). PHA is an innovative material useful in medical applications due to its degradation capability and bacterial origin that allows large-scale production and control final properties. In this research, we developed commercial PHA scaffolds using the lyophilization technique with a factorial experimental design. We used dichloromethane as PHA solvent, tergitol as surfactant, and liquid nitrogen (N 2 ) for the freezing process. We characterized the PHA by Fourier-transform infrared spectroscopy (FTIR) and thermogravimetric analysis (TGA); and the scaffolds by scanning electron microscopy (SEM) and mechanical compression and hydrolysis degradation tests. The characterization of the PHA indicated that the material is a mixture of PHA and polylactic acid (PLA). The results showed a suitable pore distribution for migration of chondrocytes through the scaffold, in addition to a behavior similar to that of the articular cartilage, although it presented lower mechanical strength. Also, the scaffolds displayed mass loss in a non-linear way related to the percentage of PHA present in the sample. In conclusion, PHA scaffolds have a potential use in tissue engineering for restoring articular cartilage.","PeriodicalId":21428,"journal":{"name":"Revista Facultad De Ingenieria-universidad De Antioquia","volume":"102 1","pages":"61-70"},"PeriodicalIF":1.0,"publicationDate":"2018-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86114303","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-05-05DOI: 10.19053/01211129.V27.N48.2018.8072
Maritza Buitrago-Vásquez, C. P. Ossa-Orozco
Injectable bone substitutes are generally composite materials capable of being extruded through a device; they consist of a solid phase inside a matrix that allows the easy movement of particles. Injectable bone substitutes have the advantage of allowing its application in situ without the need of invasive surgical techniques, guaranteeing a good recovery; for this reason, they are a promising alternative to replace conventional techniques to repair bone defects. Conventional techniques include the use of allografts and autografts, which often cause adverse reactions, and are disadvantageous for both the patient and the doctor. Furthermore, there are no reports regarding bone substitute development in Colombia, creating the necessity to research composite materials that could become injectable bone substitutes. In this study, we manufactured injectable bone substitutes with hydroxyapatite and calcium phosphate, which is most similar to bone tissue, and synthesized them in nanorods with shape and size similar to the natural hydroxyapatite found inside the body. Additionally, we used extracted silk fibroin from silkworm cocoons of Bombyx mori , a natural polymer of protein nature with high mechanical properties and excellent biocompatibility. For the materials manufactured, we evaluated degradation, in a simulated body fluid (SBF) at normal body temperature, water uptake, injectability and mechanical strength. The manufactured bone substitutes showed good degradation and water uptake properties, an approximate 97% injectability, and low mechanical resistance, indicating promising properties to be used as an injectable bone substitute.
{"title":"Degradation, water uptake, injectability and mechanical strength of injectable bone substitutes composed of silk fibroin and hydroxyapatite nanorods","authors":"Maritza Buitrago-Vásquez, C. P. Ossa-Orozco","doi":"10.19053/01211129.V27.N48.2018.8072","DOIUrl":"https://doi.org/10.19053/01211129.V27.N48.2018.8072","url":null,"abstract":"Injectable bone substitutes are generally composite materials capable of being extruded through a device; they consist of a solid phase inside a matrix that allows the easy movement of particles. Injectable bone substitutes have the advantage of allowing its application in situ without the need of invasive surgical techniques, guaranteeing a good recovery; for this reason, they are a promising alternative to replace conventional techniques to repair bone defects. Conventional techniques include the use of allografts and autografts, which often cause adverse reactions, and are disadvantageous for both the patient and the doctor. Furthermore, there are no reports regarding bone substitute development in Colombia, creating the necessity to research composite materials that could become injectable bone substitutes. In this study, we manufactured injectable bone substitutes with hydroxyapatite and calcium phosphate, which is most similar to bone tissue, and synthesized them in nanorods with shape and size similar to the natural hydroxyapatite found inside the body. Additionally, we used extracted silk fibroin from silkworm cocoons of Bombyx mori , a natural polymer of protein nature with high mechanical properties and excellent biocompatibility. For the materials manufactured, we evaluated degradation, in a simulated body fluid (SBF) at normal body temperature, water uptake, injectability and mechanical strength. The manufactured bone substitutes showed good degradation and water uptake properties, an approximate 97% injectability, and low mechanical resistance, indicating promising properties to be used as an injectable bone substitute.","PeriodicalId":21428,"journal":{"name":"Revista Facultad De Ingenieria-universidad De Antioquia","volume":"72 1 1","pages":"49-60"},"PeriodicalIF":1.0,"publicationDate":"2018-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73018854","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-05-04DOI: 10.19053/01211129.V27.N48.2018.8071
Debrayan Bravo-Hidalgo
Buildings contain the environment in which almost all human activities take place, and therefore, nowadays, they represent a great sink of energy. Establishing thermal comfort conditions within these buildings is responsible for a large portion of their energy demand. This paper aims at providing a theoretical framework of the performance and the trends in research and implementation of night air conditioning by outside air ventilation. The bibliographic search was conducted in the academic directory Scopus, and the information extracted was processed in the VOSviewer software, through which text mining, map of terms and networks of investigative action were carried out. The literature showed that direct ventilation has a more significant cooling potential in regions characterized by a high difference between day and night air temperatures. The effectiveness of night cooling and the reliable prediction of thermal behavior are strongly related to the model adopted for the convection algorithm. A reliable prediction of heat transfer by convection requires an approach based on computational simulations of fluid dynamics, which are much more demanding in terms of computational power, compared to simulations of the variation of energy flows as a function of time. Most studies showed that the position of the thermal mass is not significant, while the amount of ventilation air is of great importance. In particular, the energy demand for cooling a building decreases sharply if the air flow rates increase.
{"title":"Night air conditioning of buildings by external air ventilation","authors":"Debrayan Bravo-Hidalgo","doi":"10.19053/01211129.V27.N48.2018.8071","DOIUrl":"https://doi.org/10.19053/01211129.V27.N48.2018.8071","url":null,"abstract":"Buildings contain the environment in which almost all human activities take place, and therefore, nowadays, they represent a great sink of energy. Establishing thermal comfort conditions within these buildings is responsible for a large portion of their energy demand. This paper aims at providing a theoretical framework of the performance and the trends in research and implementation of night air conditioning by outside air ventilation. The bibliographic search was conducted in the academic directory Scopus, and the information extracted was processed in the VOSviewer software, through which text mining, map of terms and networks of investigative action were carried out. The literature showed that direct ventilation has a more significant cooling potential in regions characterized by a high difference between day and night air temperatures. The effectiveness of night cooling and the reliable prediction of thermal behavior are strongly related to the model adopted for the convection algorithm. A reliable prediction of heat transfer by convection requires an approach based on computational simulations of fluid dynamics, which are much more demanding in terms of computational power, compared to simulations of the variation of energy flows as a function of time. Most studies showed that the position of the thermal mass is not significant, while the amount of ventilation air is of great importance. In particular, the energy demand for cooling a building decreases sharply if the air flow rates increase.","PeriodicalId":21428,"journal":{"name":"Revista Facultad De Ingenieria-universidad De Antioquia","volume":"19 1","pages":"35-47"},"PeriodicalIF":1.0,"publicationDate":"2018-05-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84754744","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-05-01DOI: 10.19053/01211129.V27.N48.2018.8104
Luis Eduardo Llano-Sánchez, L. C. Ruiz, D. Domínguez-Cajeli, Martha Cecilia Melo-de-Alonso
This paper proposes a process of higher heat transfer efficiency, through a fractal design over Cesaro curve as an extend surface for an exchange tube. Our designs yielded better results applying finite element analysis compared with the smooth surface commonly used in the industry. This new adaptation can be oriented toward applications involving gases and viscous liquids, for devices such as motors, boilers and dissipaters, among others.
{"title":"Design of longitudinal finned tubes adjusted with the Cesàro curve","authors":"Luis Eduardo Llano-Sánchez, L. C. Ruiz, D. Domínguez-Cajeli, Martha Cecilia Melo-de-Alonso","doi":"10.19053/01211129.V27.N48.2018.8104","DOIUrl":"https://doi.org/10.19053/01211129.V27.N48.2018.8104","url":null,"abstract":"This paper proposes a process of higher heat transfer efficiency, through a fractal design over Cesaro curve as an extend surface for an exchange tube. Our designs yielded better results applying finite element analysis compared with the smooth surface commonly used in the industry. This new adaptation can be oriented toward applications involving gases and viscous liquids, for devices such as motors, boilers and dissipaters, among others.","PeriodicalId":21428,"journal":{"name":"Revista Facultad De Ingenieria-universidad De Antioquia","volume":"26 1","pages":"71-78"},"PeriodicalIF":1.0,"publicationDate":"2018-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79445270","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-03-27DOI: 10.17533/UDEA.REDIN.N86A02
Juliana Ossa-Valencia, Teresita Betancur-Vargas
Hydrogeochemistry is an essential tool for the verification of conceptual models, especially of groundwater flow models. This is even more relevant when dealing with complex hydrogeological models that have intercalating layers with different degrees of permeability, and regional flows contributing to the system. The hydrogeochemical characteristics of the Uraba-Colombia Aquifer and geological cross-sections were studied to establish possible processes that explain the groundwater flow evolution and the recharge zones. 4 flow lines were considered to show the groundwater evolution from Ca2+-HCO3 - facies and a TDS concentration of approximately 400 mg/L, trough Ca2+-Mg2+-HCO3 - and Na+ -Mg2+-HCO3 - facies, ending with Na+ -HCO3 - facies close to discharge area, with TDS=1,550 mg/L. Data on stable isotopes confirmed the groundwater flow directions. It is also clear that evolution orders correspond to the possible flow rates in areas with a homogeneous gradient, but with higher hydraulic conductivity conditions to the south and center, compared to the north.
{"title":"Hydrogeochemical characterization and identification of a system of regional flow. Case study: the aquifer on the Gulf of Urabá, Colombia","authors":"Juliana Ossa-Valencia, Teresita Betancur-Vargas","doi":"10.17533/UDEA.REDIN.N86A02","DOIUrl":"https://doi.org/10.17533/UDEA.REDIN.N86A02","url":null,"abstract":"Hydrogeochemistry is an essential tool for the verification of conceptual models, especially of groundwater flow models. This is even more relevant when dealing with complex hydrogeological models that have intercalating layers with different degrees of permeability, and regional flows contributing to the system. The hydrogeochemical characteristics of the Uraba-Colombia Aquifer and geological cross-sections were studied to establish possible processes that explain the groundwater flow evolution and the recharge zones. 4 flow lines were considered to show the groundwater evolution from Ca2+-HCO3 - facies and a TDS concentration of approximately 400 mg/L, trough Ca2+-Mg2+-HCO3 - and Na+ -Mg2+-HCO3 - facies, ending with Na+ -HCO3 - facies close to discharge area, with TDS=1,550 mg/L. Data on stable isotopes confirmed the groundwater flow directions. It is also clear that evolution orders correspond to the possible flow rates in areas with a homogeneous gradient, but with higher hydraulic conductivity conditions to the south and center, compared to the north.","PeriodicalId":21428,"journal":{"name":"Revista Facultad De Ingenieria-universidad De Antioquia","volume":"53 1","pages":"9-18"},"PeriodicalIF":1.0,"publicationDate":"2018-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79156780","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-03-27DOI: 10.17533/UDEA.REDIN.N86A03
Isabel Cristina Muñoz-Ortega, David Alexander Urrego-Higuita, Andrés Felipe Vallejo-Aristizábal, Alher Mauricio Hernández-Valdivieso
La evaluacion de la mecanica ventilatoria en pacientes ventilados mecanicamente permite ajustar su tratamiento en las unidades de cuidados intensivos en terminos del ajuste del modo ventilatorio y sus parametros asociados. Sin embargo, solo con maniobras obstructivas es posible estimar parametros como la compliancia y la resistencia respiratorias en ventilacion espontanea. Una de las limitaciones mas importantes en el desarrollo de tecnicas de estimacion no obstructivas de la mecanica ventilatoria es que se trata de un sistema no estacionario y la variacion de sus parametros esta sujeta a la variabilidad del patron ventilatorio. Este articulo tiene como objetivo presentar y evaluar un dispositivo que permita modificar artificialmente la distensibilidad toracica de un sujeto sano, lo cual permitira registrar en un futuro una base de datos util para el desarrollo de tecnicas de estimacion de la mecanica ventilatoria. El dispositivo se conformo por una coraza, una bomba y un controlador que permite variar la presion al interior de la coraza, la cual fue ubicada en el pecho y abdomen de los voluntarios para cambiar la distensibilidad de manera controlada. 5 voluntarios participaron en la avaluacion del dispositivo, consiguiendo cambios porcentuales de 34,5 ± 9,4% respecto a su valor en reposo para una presion de 10 cmH2O y cambios de 46,8 ± 5,7% para la maxima presion de 20 cmH2O. Se logro disenar un dispositivo que permitiera modificar artificialmente la distensibilidad toracica de manera comparable para cualquier sujeto sano
{"title":"Device for simulation of restrictive pathologies in healthy subjects with non-invasive mechanical ventilation","authors":"Isabel Cristina Muñoz-Ortega, David Alexander Urrego-Higuita, Andrés Felipe Vallejo-Aristizábal, Alher Mauricio Hernández-Valdivieso","doi":"10.17533/UDEA.REDIN.N86A03","DOIUrl":"https://doi.org/10.17533/UDEA.REDIN.N86A03","url":null,"abstract":"La evaluacion de la mecanica ventilatoria en pacientes ventilados mecanicamente permite ajustar su tratamiento en las unidades de cuidados intensivos en terminos del ajuste del modo ventilatorio y sus parametros asociados. Sin embargo, solo con maniobras obstructivas es posible estimar parametros como la compliancia y la resistencia respiratorias en ventilacion espontanea. Una de las limitaciones mas importantes en el desarrollo de tecnicas de estimacion no obstructivas de la mecanica ventilatoria es que se trata de un sistema no estacionario y la variacion de sus parametros esta sujeta a la variabilidad del patron ventilatorio. Este articulo tiene como objetivo presentar y evaluar un dispositivo que permita modificar artificialmente la distensibilidad toracica de un sujeto sano, lo cual permitira registrar en un futuro una base de datos util para el desarrollo de tecnicas de estimacion de la mecanica ventilatoria. El dispositivo se conformo por una coraza, una bomba y un controlador que permite variar la presion al interior de la coraza, la cual fue ubicada en el pecho y abdomen de los voluntarios para cambiar la distensibilidad de manera controlada. 5 voluntarios participaron en la avaluacion del dispositivo, consiguiendo cambios porcentuales de 34,5 ± 9,4% respecto a su valor en reposo para una presion de 10 cmH2O y cambios de 46,8 ± 5,7% para la maxima presion de 20 cmH2O. Se logro disenar un dispositivo que permitiera modificar artificialmente la distensibilidad toracica de manera comparable para cualquier sujeto sano","PeriodicalId":21428,"journal":{"name":"Revista Facultad De Ingenieria-universidad De Antioquia","volume":"40 1","pages":"19-26"},"PeriodicalIF":1.0,"publicationDate":"2018-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86322832","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-03-27DOI: 10.17533/UDEA.REDIN.N86A07
Andrés Díaz-Toro, Lina María Paz-Pérez, Pedro Piniés-Rodríguez, Eduardo Caicedo-Bravo
Presentamos un sistema de localizacion con informacion densa, reconstruccion 3D, y deteccion de objetos en ambientes tipo escritorio, usando una camara de profundidad; el sensor Kinect. La camara se mueve manualmente mientras se estima su posicion, y se construye un modelo denso con informacion de color de la escena que se actualiza permanentemente. El usuario puede, alternativamente, acoplar el modulo de deteccion de objetos (YOLO: you only look once [1]) para detectar y propagar al modelo informacion de categorias de objetos comunmente encontrados sobre escritorios, como monitores, teclados, libros, vasos y laptops, obteniendo un modelo con color asociado a la categoria del objeto. La posicion de la camara es estimada usando una tecnica modelo-frame con el algoritmo iterativo de punto mas cercano (ICP, iterative closest point) con resolucion en niveles, logrando una trayectoria libre de deriva, robustez a movimientos rapidos de la camara y a condiciones variables de luz. Simultaneamente, los mapas de profundidad son fusionados en una estructura volumetrica desde las posiciones estimadas de la camara. Para visualizar una representacion explicita de la escena se emplea el algoritmo marching cubes. Los algoritmos de localizacion, fusion, marching cubes y deteccion de objetos fueron implementados usando hardware para procesamiento grafico con el fin de mejorar el desempeno del sistema. Se lograron resultados sobresalientes en la posicion de la camara, alta calidad en la geometria y color del modelo, estabilidad del color usando el modulo de deteccion de objetos (robustez a detecciones erroneas) y manejo exitoso de multiples instancias de la misma categoria
我们提出了一个定位系统，在桌面环境中使用深度摄像机进行密集的信息、3D重建和物体检测;Kinect传感器。相机在估计其位置时手动移动，并建立一个密集的模型，其中包含场景的颜色信息，并不断更新。用户可以,或者,对接模块(他回家现在对象:you only look成为十一[1])来检测对象和传播模式信息categorias加尔发现桌面之上,如显示器、键盘和血管、书籍,获得相关机型颜色对象的下层阶级。相机的位置是使用模型-帧技术与迭代最近点算法(ICP，迭代最近点)与水平分辨率，实现无漂移路径，鲁棒的相机快速运动和可变的光条件。同时，深度图从相机的估计位置融合到体积结构中。为了可视化场景的显式表示，使用了行进立方体算法。利用图形处理硬件实现了定位、融合、行进立方体和对象检测算法，提高了系统性能。在相机定位、高质量的几何形状和模型颜色、使用对象检测模块的颜色稳定性(对错误检测的鲁棒性)和成功处理同一类别的多个实例方面取得了优异的成绩
{"title":"Dense tracking, mapping and scene labeling using a depth camera","authors":"Andrés Díaz-Toro, Lina María Paz-Pérez, Pedro Piniés-Rodríguez, Eduardo Caicedo-Bravo","doi":"10.17533/UDEA.REDIN.N86A07","DOIUrl":"https://doi.org/10.17533/UDEA.REDIN.N86A07","url":null,"abstract":"Presentamos un sistema de localizacion con informacion densa, reconstruccion 3D, y deteccion de objetos en ambientes tipo escritorio, usando una camara de profundidad; el sensor Kinect. La camara se mueve manualmente mientras se estima su posicion, y se construye un modelo denso con informacion de color de la escena que se actualiza permanentemente. El usuario puede, alternativamente, acoplar el modulo de deteccion de objetos (YOLO: you only look once [1]) para detectar y propagar al modelo informacion de categorias de objetos comunmente encontrados sobre escritorios, como monitores, teclados, libros, vasos y laptops, obteniendo un modelo con color asociado a la categoria del objeto. La posicion de la camara es estimada usando una tecnica modelo-frame con el algoritmo iterativo de punto mas cercano (ICP, iterative closest point) con resolucion en niveles, logrando una trayectoria libre de deriva, robustez a movimientos rapidos de la camara y a condiciones variables de luz. Simultaneamente, los mapas de profundidad son fusionados en una estructura volumetrica desde las posiciones estimadas de la camara. Para visualizar una representacion explicita de la escena se emplea el algoritmo marching cubes. Los algoritmos de localizacion, fusion, marching cubes y deteccion de objetos fueron implementados usando hardware para procesamiento grafico con el fin de mejorar el desempeno del sistema. Se lograron resultados sobresalientes en la posicion de la camara, alta calidad en la geometria y color del modelo, estabilidad del color usando el modulo de deteccion de objetos (robustez a detecciones erroneas) y manejo exitoso de multiples instancias de la misma categoria","PeriodicalId":21428,"journal":{"name":"Revista Facultad De Ingenieria-universidad De Antioquia","volume":"44 1","pages":"54-69"},"PeriodicalIF":1.0,"publicationDate":"2018-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73798705","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-03-27DOI: 10.17533/UDEA.REDIN.N86A04
Johan Sebastián Díaz-Tovar, S. Valbuena-Duarte, F. Racedo-Niebles
Non-linear optical properties were obtained as a function of laser power for the 20W-50 multigrade oil for engines. These properties were obtained by using the Z-scan technique for transmission in closed and open cell configurations. A Nd:YAG laser operating in continuous wave (CW) was used, emitting in 532 nm and regulated in electric current. To control the technique, an interface was implemented in LabVIEW, which allows real-time monitoring of the measurement development. The values of the non-linear absorption coefficient (b), non-linear refractive index (n2), and third-order electrical susceptibility (x(3)) were estimated, finding orders of magnitude of 10-3 cm/W, 10-9 cm2/W, and 10-5 esu, respectively. These previous results show that an automobile lubricating oil has significant non-linear optical properties.
{"title":"Study of non-linear optical properties in automobile lubricating oil via Z-Scan technique","authors":"Johan Sebastián Díaz-Tovar, S. Valbuena-Duarte, F. Racedo-Niebles","doi":"10.17533/UDEA.REDIN.N86A04","DOIUrl":"https://doi.org/10.17533/UDEA.REDIN.N86A04","url":null,"abstract":"Non-linear optical properties were obtained as a function of laser power for the 20W-50 multigrade oil for engines. These properties were obtained by using the Z-scan technique for transmission in closed and open cell configurations. A Nd:YAG laser operating in continuous wave (CW) was used, emitting in 532 nm and regulated in electric current. To control the technique, an interface was implemented in LabVIEW, which allows real-time monitoring of the measurement development. The values of the non-linear absorption coefficient (b), non-linear refractive index (n2), and third-order electrical susceptibility (x(3)) were estimated, finding orders of magnitude of 10-3 cm/W, 10-9 cm2/W, and 10-5 esu, respectively. These previous results show that an automobile lubricating oil has significant non-linear optical properties.","PeriodicalId":21428,"journal":{"name":"Revista Facultad De Ingenieria-universidad De Antioquia","volume":"6 1","pages":"27-31"},"PeriodicalIF":1.0,"publicationDate":"2018-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75280623","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-03-27DOI: 10.17533/UDEA.REDIN.N86A06
J. F. Herrera-Cubides, P. Gaona-García, Jorge Ivan Alonso-Echeverri, Kevin Alexandre Riaño-Vargas, A. Gómez-Acosta
Linked Data is a way of using the network by creating links among data from different information sources in order to improve search processes, semantic interoperability among other functionalities. One of the strategies used to perform linked resources queries is through the consumption of SPARQL Endpoints. However, to determine existent trust levels within and outside the knowledge domains where such resources are, the operation of these Endpoints is one of the critical factors for both to realize the state of these resources and their subsequent consumption. To recognize these states, the present article aims at exposing the description, modeling, implementation and analysis of a type-I fuzzy system based on logical rules. It also addresses decision-making regarding the uncertainty that presents the definition of levels of trust to determine the consumption obtained over a set of LOD Datasets Located in several Endpoints. Finally, it presents results, conclusions and further work from a case study performed through the postulation of parameters obtained at runtime over several Endpoints.
{"title":"A fuzzy logic system to evaluate levels of trust on linked open data resources","authors":"J. F. Herrera-Cubides, P. Gaona-García, Jorge Ivan Alonso-Echeverri, Kevin Alexandre Riaño-Vargas, A. Gómez-Acosta","doi":"10.17533/UDEA.REDIN.N86A06","DOIUrl":"https://doi.org/10.17533/UDEA.REDIN.N86A06","url":null,"abstract":"Linked Data is a way of using the network by creating links among data from different information sources in order to improve search processes, semantic interoperability among other functionalities. One of the strategies used to perform linked resources queries is through the consumption of SPARQL Endpoints. However, to determine existent trust levels within and outside the knowledge domains where such resources are, the operation of these Endpoints is one of the critical factors for both to realize the state of these resources and their subsequent consumption. To recognize these states, the present article aims at exposing the description, modeling, implementation and analysis of a type-I fuzzy system based on logical rules. It also addresses decision-making regarding the uncertainty that presents the definition of levels of trust to determine the consumption obtained over a set of LOD Datasets Located in several Endpoints. Finally, it presents results, conclusions and further work from a case study performed through the postulation of parameters obtained at runtime over several Endpoints.","PeriodicalId":21428,"journal":{"name":"Revista Facultad De Ingenieria-universidad De Antioquia","volume":"122 1","pages":"40-53"},"PeriodicalIF":1.0,"publicationDate":"2018-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79391658","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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