The Experts below are selected from a list of 42 Experts worldwide ranked by ideXlab platform

Pérez-rondón, Félix Antonio - One of the best experts on this subject based on the ideXlab platform.

  • Design, simulation and construction of a pellets transportation laboratory
    'Universidad Santo Tomas', 2019
    Co-Authors: Flórez-ruiz, Juan Fernando, Díaz-rodríguez, Jorge Guillermo, Ramírez-dueñes Alexander, Pérez-rondón, Félix Antonio
    Abstract:

    Este artículo presenta cómo se diseñaron y construyeron tres modelos a escala de maquinaria industrial, como una forma educativa de mostrar el transporte de material particulado. En la literatura analizada se encontraron modelos de cálculo para equipos a nivel industrial, más no a nivel de laboratorio. Se escogieron los más representativos del transporte comercial: un tornillo transportador, una banda transportadora y un elevador de cangilones. Estos tres equipos se calcularon y fueron construidos en policarbonato para permitir la visualización de su funcionamiento interno. Los tres equipos están controlados por un controlador lógico programable (PLC) y conectados entre sí por una red SCADA. Los equipos son modulares para no alterar el orden de funcionamiento, pudiendo obtener diferentes secuencias de trabajo. Además, se elaboró una interfaz gráfica hombre-máquina (HMI) para supervisar y controlar los equipos diseñados. Los resultados de flujo de transporte y material particulado obtenidos son aproximadamente coincidentes con los calculados, validando el uso de los modelos de cálculo para niveles de trabajo mucho menores. Finalmente, se destaca que el sistema obtenido es un entorno para que los estudiantes implementen técnicas de control usando los sensores y motores presentes.The article presents how three scaled down industrial machinery models were designed and built as an educational tool to present the transport of particulate material. The literature review showed calculation models for equipment at industrial level, not for laboratory level. There were chosen the most representative means of commercial transport for particulate materials: a conveyor screw, a conveyor belt and a bucket elevator. These three machines were calculated and built in polycarbonate to allow visualization of their internal functioning. The three devices are controlled by a programmable logic controller (PLC) and connected to each other by a SCADA network. The equipment is modular so as not to alter the Order of Operation, being able to obtain different work sequences. In addition, a man-machine graphic interface (HMI) was developed to supervise and to control the designed equipment. The results of particulate material mass flow obtained are approximately coincident with those estimated, validating the use of calculation models for much lower levels of work. Finally, it is emphasized that the system obtained is an environment for students to implement control techniques using the sensors and motors used in the designs

  • Diseño, simulación y construcción de un modelo de laboratorio de transporte de pellets
    2019
    Co-Authors: Flórez-ruiz, Juan Fernando, Díaz-rodríguez, Jorge Guillermo, Ramírez-dueñes Alexander, Pérez-rondón, Félix Antonio
    Abstract:

    The article presents how three scaled down industrial machinery models were designed and built as an educational tool to present the transport of particulate material. The literature review showed calculation models for equipment at industrial level, not for laboratory level. There were chosen the most representative means of commercial transport for particulate materials: a conveyor screw, a conveyor belt and a bucket elevator. These three machines were calculated and built in polycarbonate to allow visualization of their internal functioning. The three devices are controlled by a programmable logic controller (PLC) and connected to each other by a SCADA network. The equipment is modular so as not to alter the Order of Operation, being able to obtain different work sequences. In addition, a man-machine graphic interface (HMI) was developed to supervise and to control the designed equipment. The results of particulate material mass flow obtained are approximately coincident with those estimated, validating the use of calculation models for much lower levels of work. Finally, it is emphasized that the system obtained is an environment for students to implement control techniques using the sensors and motors used in the designs.Este artículo presenta cómo se diseñaron y construyeron tres modelos a escala de maquinaria industrial, como una forma educativa de mostrar el transporte de material particulado. En la literatura analizada se encontraron modelos de cálculo para equipos a nivel industrial, más no a nivel de laboratorio. Se escogieron los más representativos del transporte comercial: un tornillo transportador, una banda transportadora y un elevador de cangilones. Estos tres equipos se calcularon y fueron construidos en policarbonato para permitir la visualización de su funcionamiento interno. Los tres equipos están controlados por un controlador lógico programable (PLC) y conectados entre sí por una red SCADA. Los equipos son modulares para no alterar el orden de funcionamiento, pudiendo obtener diferentes secuencias de trabajo. Además, se elaboró una interfaz gráfica hombre-máquina (HMI) para supervisar y controlar los equipos diseñados. Los resultados de flujo de transporte y material particulado obtenidos son aproximadamente coincidentes con los calculados, validando el uso de los modelos de cálculo para niveles de trabajo mucho menores. Finalmente, se destaca que el sistema obtenido es un entorno para que los estudiantes implementen técnicas de control usando los sensores y motores presentes

Flórez-ruiz, Juan Fernando - One of the best experts on this subject based on the ideXlab platform.

  • Design, simulation and construction of a pellets transportation laboratory
    'Universidad Santo Tomas', 2019
    Co-Authors: Flórez-ruiz, Juan Fernando, Díaz-rodríguez, Jorge Guillermo, Ramírez-dueñes Alexander, Pérez-rondón, Félix Antonio
    Abstract:

    Este artículo presenta cómo se diseñaron y construyeron tres modelos a escala de maquinaria industrial, como una forma educativa de mostrar el transporte de material particulado. En la literatura analizada se encontraron modelos de cálculo para equipos a nivel industrial, más no a nivel de laboratorio. Se escogieron los más representativos del transporte comercial: un tornillo transportador, una banda transportadora y un elevador de cangilones. Estos tres equipos se calcularon y fueron construidos en policarbonato para permitir la visualización de su funcionamiento interno. Los tres equipos están controlados por un controlador lógico programable (PLC) y conectados entre sí por una red SCADA. Los equipos son modulares para no alterar el orden de funcionamiento, pudiendo obtener diferentes secuencias de trabajo. Además, se elaboró una interfaz gráfica hombre-máquina (HMI) para supervisar y controlar los equipos diseñados. Los resultados de flujo de transporte y material particulado obtenidos son aproximadamente coincidentes con los calculados, validando el uso de los modelos de cálculo para niveles de trabajo mucho menores. Finalmente, se destaca que el sistema obtenido es un entorno para que los estudiantes implementen técnicas de control usando los sensores y motores presentes.The article presents how three scaled down industrial machinery models were designed and built as an educational tool to present the transport of particulate material. The literature review showed calculation models for equipment at industrial level, not for laboratory level. There were chosen the most representative means of commercial transport for particulate materials: a conveyor screw, a conveyor belt and a bucket elevator. These three machines were calculated and built in polycarbonate to allow visualization of their internal functioning. The three devices are controlled by a programmable logic controller (PLC) and connected to each other by a SCADA network. The equipment is modular so as not to alter the Order of Operation, being able to obtain different work sequences. In addition, a man-machine graphic interface (HMI) was developed to supervise and to control the designed equipment. The results of particulate material mass flow obtained are approximately coincident with those estimated, validating the use of calculation models for much lower levels of work. Finally, it is emphasized that the system obtained is an environment for students to implement control techniques using the sensors and motors used in the designs

  • Diseño, simulación y construcción de un modelo de laboratorio de transporte de pellets
    2019
    Co-Authors: Flórez-ruiz, Juan Fernando, Díaz-rodríguez, Jorge Guillermo, Ramírez-dueñes Alexander, Pérez-rondón, Félix Antonio
    Abstract:

    The article presents how three scaled down industrial machinery models were designed and built as an educational tool to present the transport of particulate material. The literature review showed calculation models for equipment at industrial level, not for laboratory level. There were chosen the most representative means of commercial transport for particulate materials: a conveyor screw, a conveyor belt and a bucket elevator. These three machines were calculated and built in polycarbonate to allow visualization of their internal functioning. The three devices are controlled by a programmable logic controller (PLC) and connected to each other by a SCADA network. The equipment is modular so as not to alter the Order of Operation, being able to obtain different work sequences. In addition, a man-machine graphic interface (HMI) was developed to supervise and to control the designed equipment. The results of particulate material mass flow obtained are approximately coincident with those estimated, validating the use of calculation models for much lower levels of work. Finally, it is emphasized that the system obtained is an environment for students to implement control techniques using the sensors and motors used in the designs.Este artículo presenta cómo se diseñaron y construyeron tres modelos a escala de maquinaria industrial, como una forma educativa de mostrar el transporte de material particulado. En la literatura analizada se encontraron modelos de cálculo para equipos a nivel industrial, más no a nivel de laboratorio. Se escogieron los más representativos del transporte comercial: un tornillo transportador, una banda transportadora y un elevador de cangilones. Estos tres equipos se calcularon y fueron construidos en policarbonato para permitir la visualización de su funcionamiento interno. Los tres equipos están controlados por un controlador lógico programable (PLC) y conectados entre sí por una red SCADA. Los equipos son modulares para no alterar el orden de funcionamiento, pudiendo obtener diferentes secuencias de trabajo. Además, se elaboró una interfaz gráfica hombre-máquina (HMI) para supervisar y controlar los equipos diseñados. Los resultados de flujo de transporte y material particulado obtenidos son aproximadamente coincidentes con los calculados, validando el uso de los modelos de cálculo para niveles de trabajo mucho menores. Finalmente, se destaca que el sistema obtenido es un entorno para que los estudiantes implementen técnicas de control usando los sensores y motores presentes

John P. Meehan - One of the best experts on this subject based on the ideXlab platform.

  • Total Hip Instability and the Spinopelvic Link
    Current Reviews in Musculoskeletal Medicine, 2020
    Co-Authors: Mauro Giordani, John P. Meehan
    Abstract:

    Purpose of Review Advances in technology, implant design, and surgical technique have lowered the dislocation rate in primary total hip arthroplasty (THA). Despite these advances, there remain a large number of instability episodes without a known etiology. Recent research suggests that the pelvic and lumbar spine interrelationship may be the explanation in prosthetic dislocations without a known cause. In this review, we describe the biomechanics, measurements, diagnoses, classification, management, and outcomes of total hip and revision total hip instability as it relates to spinopelvic alignment. Recent Findings As a person goes from standing to sitting, lumbar lordosis decreases, and the sacrum and entire pelvis tilts posteriorly with sacrum and coccyx rotating posterior-inferiorly, resulting in increased acetabular cup anteversion to accommodate femoral flexion. A fused spine and associated fixed acetabulum can result in abnormal pelvic femoral motion, impingement, and dislocation. Classifying the spinopelvic mechanics by sacral motion based on sitting and standing lateral radiographs provides an understanding of how the acetabulum behaves in space. This information helps appropriate cup positioning, reducing the risk of femoral side impingement and subsequent dislocation. Summary Surgical techniques to consider in the spinopelvic at-risk patient are positioning considerations in acetabular cup inclination and anteversion, high offset femoral stems, high offset acetabular liners, dual mobility articulations, and removal of impinging structures. Future research is needed to define the safest Order of Operation in concomitant hip and spine pathology, the effects on pelvic femoral biomechanics in spine surgery, and whether preoperative and intraoperative management strategies have a long-term beneficial effect on the dislocation rate.

Ji-hoon Kang - One of the best experts on this subject based on the ideXlab platform.

  • XQuery Query Rewriting for Query Optimization in Distributed Environments
    Journal of the Korea Society of Computer and Information, 2009
    Co-Authors: Jong-hyun Park, Ji-hoon Kang
    Abstract:

    XQuery query proposed by W3C is one of the standard query languages for XML data and is widely accepted by many applications. Therefore the studies for efficient Processing of XQuery query have become a topic of critical importance recently and the optimization of XQuery query is one of new issues in these studies. However, previous researches just focus on the optimization techniques for a specific XML data management system and these optimization techniques can not be used under the any XML data management systems. Also, some previous researches use predefined XML data structure information such as XML schema or DTD for the optimization. In the real situation, however applications do not all refer to the structure information for XML data. Therefore, this paper analyzes only a XQuery query and optimize by using itself of the XQuery query. In this paper, we propose 3 kinds of optimization method that considers the characteristic of XQuery query. First method removes the redundant expressions described in XQuery query second method replaces the processing Order of Operation and clause in XQuery query and third method rewrites the XQuery query based on FOR clause. In case of third method, we consider FOR clause because generally FOR clause generates a loop in XQuery query and the loop often rises to execution frequency of redundant Operation. Through a performance evaluation, we show that the processing time for rewritten queries is less than for original queries. also each method in our XQuery query optimizer can be used separately because the each method is independent.

Ramírez-dueñes Alexander - One of the best experts on this subject based on the ideXlab platform.

  • Design, simulation and construction of a pellets transportation laboratory
    'Universidad Santo Tomas', 2019
    Co-Authors: Flórez-ruiz, Juan Fernando, Díaz-rodríguez, Jorge Guillermo, Ramírez-dueñes Alexander, Pérez-rondón, Félix Antonio
    Abstract:

    Este artículo presenta cómo se diseñaron y construyeron tres modelos a escala de maquinaria industrial, como una forma educativa de mostrar el transporte de material particulado. En la literatura analizada se encontraron modelos de cálculo para equipos a nivel industrial, más no a nivel de laboratorio. Se escogieron los más representativos del transporte comercial: un tornillo transportador, una banda transportadora y un elevador de cangilones. Estos tres equipos se calcularon y fueron construidos en policarbonato para permitir la visualización de su funcionamiento interno. Los tres equipos están controlados por un controlador lógico programable (PLC) y conectados entre sí por una red SCADA. Los equipos son modulares para no alterar el orden de funcionamiento, pudiendo obtener diferentes secuencias de trabajo. Además, se elaboró una interfaz gráfica hombre-máquina (HMI) para supervisar y controlar los equipos diseñados. Los resultados de flujo de transporte y material particulado obtenidos son aproximadamente coincidentes con los calculados, validando el uso de los modelos de cálculo para niveles de trabajo mucho menores. Finalmente, se destaca que el sistema obtenido es un entorno para que los estudiantes implementen técnicas de control usando los sensores y motores presentes.The article presents how three scaled down industrial machinery models were designed and built as an educational tool to present the transport of particulate material. The literature review showed calculation models for equipment at industrial level, not for laboratory level. There were chosen the most representative means of commercial transport for particulate materials: a conveyor screw, a conveyor belt and a bucket elevator. These three machines were calculated and built in polycarbonate to allow visualization of their internal functioning. The three devices are controlled by a programmable logic controller (PLC) and connected to each other by a SCADA network. The equipment is modular so as not to alter the Order of Operation, being able to obtain different work sequences. In addition, a man-machine graphic interface (HMI) was developed to supervise and to control the designed equipment. The results of particulate material mass flow obtained are approximately coincident with those estimated, validating the use of calculation models for much lower levels of work. Finally, it is emphasized that the system obtained is an environment for students to implement control techniques using the sensors and motors used in the designs

  • Diseño, simulación y construcción de un modelo de laboratorio de transporte de pellets
    2019
    Co-Authors: Flórez-ruiz, Juan Fernando, Díaz-rodríguez, Jorge Guillermo, Ramírez-dueñes Alexander, Pérez-rondón, Félix Antonio
    Abstract:

    The article presents how three scaled down industrial machinery models were designed and built as an educational tool to present the transport of particulate material. The literature review showed calculation models for equipment at industrial level, not for laboratory level. There were chosen the most representative means of commercial transport for particulate materials: a conveyor screw, a conveyor belt and a bucket elevator. These three machines were calculated and built in polycarbonate to allow visualization of their internal functioning. The three devices are controlled by a programmable logic controller (PLC) and connected to each other by a SCADA network. The equipment is modular so as not to alter the Order of Operation, being able to obtain different work sequences. In addition, a man-machine graphic interface (HMI) was developed to supervise and to control the designed equipment. The results of particulate material mass flow obtained are approximately coincident with those estimated, validating the use of calculation models for much lower levels of work. Finally, it is emphasized that the system obtained is an environment for students to implement control techniques using the sensors and motors used in the designs.Este artículo presenta cómo se diseñaron y construyeron tres modelos a escala de maquinaria industrial, como una forma educativa de mostrar el transporte de material particulado. En la literatura analizada se encontraron modelos de cálculo para equipos a nivel industrial, más no a nivel de laboratorio. Se escogieron los más representativos del transporte comercial: un tornillo transportador, una banda transportadora y un elevador de cangilones. Estos tres equipos se calcularon y fueron construidos en policarbonato para permitir la visualización de su funcionamiento interno. Los tres equipos están controlados por un controlador lógico programable (PLC) y conectados entre sí por una red SCADA. Los equipos son modulares para no alterar el orden de funcionamiento, pudiendo obtener diferentes secuencias de trabajo. Además, se elaboró una interfaz gráfica hombre-máquina (HMI) para supervisar y controlar los equipos diseñados. Los resultados de flujo de transporte y material particulado obtenidos son aproximadamente coincidentes con los calculados, validando el uso de los modelos de cálculo para niveles de trabajo mucho menores. Finalmente, se destaca que el sistema obtenido es un entorno para que los estudiantes implementen técnicas de control usando los sensores y motores presentes