Networks that have optical fibre and coaxial cable as support for signal distribution are HFC net... more Networks that have optical fibre and coaxial cable as support for signal distribution are HFC networks. They are used to build a broadband network. This paper treats a HFC Network monitoring system for estimating fault location in transmission or distribution systems by collecting fault information from cable modems installed at customer locations.
Congenital Zika virus (ZIKV) exposure results in a spectrum of disease ranging from severe birth ... more Congenital Zika virus (ZIKV) exposure results in a spectrum of disease ranging from severe birth defects to delayed onset neurodevelopmental deficits. ZIKV-related neuropathogenesis, predictors of birth defects, and neurodevelopmental deficits are not well defined in people. Here we assess the methodological and statistical feasibility of a congenital ZIKV exposure macaque model for identifying infant neurobehavior and brain abnormalities that may underlie neurodevelopmental deficits. We inoculated five pregnant macaques with ZIKV and mock-inoculated one macaque in the first trimester. Following birth, growth, ocular structure/function, brain structure, hearing, histopathology, and neurobehavior were quantitatively assessed during the first week of life. We identified the typical pregnancy outcomes of congenital ZIKV infection, with fetal demise and placental abnormalities. We estimated sample sizes needed to define differences between groups and demonstrated that future studies qua...
Human pegivirus (HPgV)-formerly known as GB virus C and hepatitis G virus-is a poorly characteriz... more Human pegivirus (HPgV)-formerly known as GB virus C and hepatitis G virus-is a poorly characterized RNA virus that infects about one-sixth of the global human population and is transmitted frequently in the blood supply. We create an animal model of HPgV infection by infecting macaque monkeys with a new simian pegivirus (SPgV) discovered in wild baboons. Using this model, we provide a high-resolution, longitudinal picture of SPgV viremia where the dose, route, and timing of infection are known. We detail the highly variable acute phase of SPgV infection, showing that the viral load trajectory early in infection is dependent on the infecting dose, whereas the chronic-phase viremic set point is not. We also show that SPgV has an extremely low propensity for accumulating sequence variation, with no consensus-level variants detected during the acute phase of infection and an average of only 1.5 variants generated per 100 infection-days. Finally, we show that SPgV RNA is highly concentra...
Proceedings of the 3rd ACM/IEEE Symposium on Architecture for networking and communications systems - ANCS '07, 2007
Scheduling in large switches is challenging. Arbiters must operate at high rates to keep up with ... more Scheduling in large switches is challenging. Arbiters must operate at high rates to keep up with the high switching rates demanded by multi-gigabit-per-second link rates and short cells. Low-latency requirements of some applications also challenge the design of schedulers. In this paper, we propose the Parallel Wrapped Wave Front Arbiter with Fast Scheduler (PWWFA-FS). We analyze its performance, present simulation results, discuss its implementation, and show how this scheme can provide low latency under light load while scaling to large switches with multi-terabit-per-second throughput and hundreds of ports.
15th EUROMICRO International Conference on Parallel, Distributed and Network-Based Processing (PDP'07), 2007
Ethernet is turning out to be a cost-effective solution for building Cluster networks offering co... more Ethernet is turning out to be a cost-effective solution for building Cluster networks offering compatibility, simplicity, high bandwidth, scalability and a good performanceto-cost ratio. Nevertheless, Ethernet still makes inefficient use of network resources (links) and suffers from long failure recovery time due to the lack of a suitable routing algorithm. In this paper we embed an efficient routing algorithm into 802.3 Ethernet technology, making it possible to use off-the-shelf equipment to build high-performance and costeffective Ethernet clusters, with an efficient use of link bandwidth and with fault tolerant capabilities. The algorithm, referred to as Segment-Based Routing (SR), is a deterministic routing algorithm that achieves high performance without the need for virtual channels (not available in Ethernet). Moreover, SR is topology agnostic, meaning it can be applied to any topology, and tolerates any combination of faults derived from the original topology when combined with static reconfiguration. Through simulations we verify an overall improvement in throughput by a factor of 1.2 to 10.0 when compared to the conventional Ethernet routing algorithm, the Spanning Tree Protocol (STP), and other topology agnostic routing algorithms such as Up*/Down* and Tree-based Turn-prohibition, the last one being recently proposed for Ethernet.
Proceedings 20th IEEE International Parallel & Distributed Processing Symposium, 2006
Computers get faster every year, but the demand for computing resources seems to grow at an even ... more Computers get faster every year, but the demand for computing resources seems to grow at an even faster rate. Depending on the problem domain, this demand for more power can be satisfied by either, massively parallel computers, or clusters of computers. Common for both approaches is the dependence on high performance interconnect networks such as Myrinet, Infiniband, or 10 Gigabit Ethernet. While high throughput and low latency are key features of interconnection networks, the issue of faulttolerance is now becoming increasingly important. As the number of network components grows so does the probability for failure, thus it becomes important to also consider the fault-tolerance mechanism of interconnection networks. The main challenge then lies in combining performance and fault-tolerance, while still keeping cost and complexity low. This paper proposes a new deterministic routing methodology for tori and meshes, which achieves high performance without the use of virtual channels. Furthermore, it is topology agnostic in nature, meaning it can handle any topology derived from any combination of faults when combined with static reconfiguration. The algorithm, referred to as Segment-based Routing (SR), works by partitioning a topology into subnets, and subnets into segments. This allows us to place bidirectional turn restrictions locally within a segment. As segments are independent, we gain the freedom to place turn restrictions within a segment independently from other segments. This results in a larger degree of freedom when placing turn restrictions compared to other routing strategies. In this paper a way to compute segment-based routing tables is presented and applied to meshes and tori. Evaluation results show that SR increases performance by a factor of 1.8 over FX and up*/down* routing.
International Journal of Parallel Programming, 2010
Networks on Chip (NoCs) have been shown as an efficient solution to the complex on-chip communica... more Networks on Chip (NoCs) have been shown as an efficient solution to the complex on-chip communication problems derived from the increasing number of processor cores. One of the key issues in the design of NoCs is the reduction of both area and power dissipation. As a result, two-dimensional meshes have become the preferred topology, since it offers low and constant link delay. Unfortunately, manufacturing defects or even real-time failures often make the resulting topology to become irregular, preventing the use of traditional routing algorithms. This scenario shows the need for topology-agnostic routing algorithms that provide a valid routing solution when applied over any topology. This paper proposes a new communication-driven routing technique that optimizes the network performance for Application-Specific NoCs. This technique combines a flexible, topology-agnostic routing algorithm with a communication-aware mapping technique that matches the traffic generated by the application with the available network bandwidth. Since the mapping technique can be pruned as needed in order to fit either quality function values or time constraints, this technique can be adapted to fit with different computational costs. The evaluation results show that it significantly improves network performance in terms of both latency and power consumption.
We performed systematic experiments on the synthesis of layered crystal α-ZrP and revealed the co... more We performed systematic experiments on the synthesis of layered crystal α-ZrP and revealed the control of size, aspect ratio and size polydispersity of disk-shaped crystals. The growth of the disks is mediated by oriented attachment, taking place continuously throughout the hydrothermal treatment between various sized disks. The master of the synthesis of layered crystals will contribute to various applications such as the nanocomposites and liquid crystals.
2008 37th International Conference on Parallel Processing, 2008
The topology, the routing algorithm and the way the traffic pattern is distributed over the netwo... more The topology, the routing algorithm and the way the traffic pattern is distributed over the network influence the ultimate performance of the interconnection network. Offchip high-performance interconnects provide mechanisms to support irregular topologies, whereas in on-chip networks the topology is fixed at design time. Continuous trend on device miniaturization and high volume manufacturing increase the probability of faults in embedded systems, leading to irregular topologies. Also, partitionability and virtualization of the entire on-chip network is envisioned for future systems. These trends lead to the need of routing algorithms that adapt to the static or dynamic changes in irregular topologies. In this paper we analyze the benefits of the reconfiguration at the routing algorithm level in order to allow topology changes. That is, support topology changes that appear on the network due to different reasons including switch or link failures, energy reduction decisions or design and manufacturing issues. We perform an exhaustive analysis on the performance impact of the routing algorithm in a NoC system. Our aim is to enable the possibility of reconfiguration of the routing algorithm. We take advantage on the flexibility offered by the segment-based routing methodology that allows a fast computation of many deadlock-free routing algorithms by obtaining different segmentation processes and routing restriction policies. This study analyzes the potentials offered by SR. Results show that the election of the routing algorithm may greatly affect the final performance of the network. Additionally, we propose an organized segmentation process that achieves reliable performance with low variability for all topologies studied under uniform traffic conditions. These results encourages us to the search of a dynamic mechanism that adapts the routing algorithm to the traffic.
2014 IEEE International Conference on Consumer Electronics (ICCE), 2014
ABSTRACT Video game production is facing challenges related to the need to increase consideration... more ABSTRACT Video game production is facing challenges related to the need to increase consideration of player characteristics from the user perspective. This paper presents an initial proposal of factors that may be considered so that video games can be more user-centered. For example, we mention managing affective characteristics and relating player emotions to aspects of video game characters and other entities.
SPE International Conference on Health, Safety and Environment in Oil and Gas Exploration and Production, 2010
The oil and gas industry has reached a plateau in many of its health, safety, and environment (HS... more The oil and gas industry has reached a plateau in many of its health, safety, and environment (HSE) indicators. Statistics show that over the last five years the industry has not experienced a significant reduction in either the number or severity of accidents, despite the investment of considerable effort and money. Influencing employee behavior has been identified as the key factor for resuming performance improvement, with several organizations adopting systems to tackle the challenge using behavior-based safety programs. In the opinion of the authors, most of these programs have had limited effectiveness due their being implemented in isolation, rather than integrated into an overall management system. This paper shows how a corporate program in an oilfield services company has been fully integrated into the organization's HSE culture with an innovative approach: humanizing the management system. The paper describes the vision and strategy to bring implementation of the mana...
The cottontail rabbit papillomavirus (CRPV) / rabbit model has proved useful for the investigatio... more The cottontail rabbit papillomavirus (CRPV) / rabbit model has proved useful for the investigation of prophylactic and therapeutic vaccines and for the study of the pathogenesis of papillomavirus infection. It is currently the only animal model in which the entire viral program can be recapitulated, including progression to cancer. CRPV DNA is infectious in domestic rabbits and therefore mutants can be studied without the need to generate corresponding viruses. Although the CRPV animal model is used widely in various laboratories, no optimized or standardized method is used for creating CRPV viral and especially DNA infections. These different methods have made it difficult for investigators to compare results from laboratory to laboratory. A simple and highly efficient method is reported here; it has been refined based on previous methodology for the production of CRPV infections from both virus and plasmid DNA. This method can be adapted easily by other investigators in the field. The resulting standardization will aid in the evaluation of data from different laboratories.
Concentration profiles, interface thickness, and interface tensions have been calculated for mixt... more Concentration profiles, interface thickness, and interface tensions have been calculated for mixtures applying the gradient theory to the Peng-Robinson equation of state. The approach is based on an accurate local fit of vapor-liquid equilibrium (VLE) data, and, for this purpose, the flexibility of the original Wong-Sandler mixing rule has been taken into account. Correlation and prediction capabilities of experimental interfacial tension data are analyzed for the quadratic mixing rule and the present approach. The method, which is discussed in detail in this work, provides an improved scheme for calculating interfacial properties, both for polar and nonpolar mixtures. According to results, a better correlation and prediction of the interfacial tensions can be obtained from an adequate interpolation of the VLE, using simple cubic equations of state. Examples are presented for binary and ternary mixtures.
I Q U I D equilibrium data for the ternary chloroform-methanol-ethyl acetate system and its three... more I Q U I D equilibrium data for the ternary chloroform-methanol-ethyl acetate system and its three component binary systems a t atmospheric pressure were determined as part of a continuing study of relationships for ternary systems which are prerequisite in the design of multicomponent distillation equipment. This ternary system was chosen for two reasons: to confirm whether the ternary system exhibits an azeotrope, as the binary chloroform-methanol and the methanol-ethyl acetate systems form a minimum boiling point azeotrope (4, 10, 13); and to examine whether ternary constants are needed in the calculation of the ternary vapor-liquid equilibria from data on the binary systems. EXPERIMENTAL Purity of Compounds. The compounds supplied for this work were first grade (Japanese Industrial Standards) materials. Chloroform was purified by distilling in a glass column packed with McMahon packings. Methanol was distilled in the same column. Ethyl acetate was washed with distilled water three times to remove alcohol and treated by drying over anhydrous potassium carbonate and distilled in the same column. In distillation the predistillate and residue liquids, each approximately one-sixth of the charge, were discarded, and the heart cut 'used for experimental work. Proper precautions minimized absorption of atmospheric moisture by methanol and ethyl acetate. The properties of the purified compounds are listed in Table I together with reliable literature values. Analytical Method. Density and refractive index were used as means of analyses of the unknown binary and ternary mixtures. Densities were determined using 10-ml. pycnometers with graduated arms a t 25" f 0.1" C. Measurements
The shield region is a singular range of the global phase diagram (GPD), where equations of state... more The shield region is a singular range of the global phase diagram (GPD), where equations of state based on mean-field theories predict a quadruple point (QP) for fluid binary mixtures. The QP in question is characterized by three immiscible liquids and a vapor in equilibrium. No experimental system has been found exhibiting such an equilibrium behavior. In this theoretical study the interfacial and wetting behavior of the phases that coexist at the QP by applying the gradient theory to the van der Waals equation of state is described.
Industrial & Engineering Chemistry Research, 2014
We present a corresponding states correlation based on the description of fluid phase properties ... more We present a corresponding states correlation based on the description of fluid phase properties by means of an Mie intermolecular potential applied to tangentially bonded spheres. The macroscopic properties of this model fluid are very accurately represented by a recently proposed version of the Statistical Associating Fluid Theory (the SAFT-γ version). The Mie potential can be expressed in a conformal manner in terms of three parameters that relate to a length scale, σ, an energy scale, ε, and the range or functional form of the potential, λ, while the nonsphericity or elongation of a molecule can be appropriately described by the chain length, m. For a given chain length, correlations are given to scale the SAFT equation of state in terms of three experimental parameters: the acentric factor, the critical temperature, and the saturated liquid density at a reduced temperature of 0.7. The molecular nature of the equation of state is exploited to make a direct link between the macroscopic thermodynamic parameters used to characterize the equation of state and the parameters of the underlying Mie potential. This direct link between macroscopic properties and molecular parameters is the basis to propose a top-down method to parametrize force fields that can be used in the coarse grained molecular modeling (Monte Carlo or molecular dynamics) of fluids. The resulting correlation is of quantitative accuracy and examples of the prediction of simulations of vapor−liquid equilibria and interfacial tensions are given. In essence, we present a recipe that allows one to obtain intermolecular potentials for use in the molecular simulation of simple and chain fluids from macroscopic experimentally determined constants, namely the acentric factor, the critical temperature, and a value of the liquid density at a reduced temperature of 0.7. av 2 3 av 3 (3) where N av is Avogadro's number. Comparing eqs 2 and 3 one can immediately establish a link between the macroscopic
IEEE Transactions on Parallel and Distributed Systems, 2012
Most standard cluster interconnect technologies are flexible with respect to network topology. Th... more Most standard cluster interconnect technologies are flexible with respect to network topology. This has spawned a substantial amount of research on topology-agnostic routing algorithms, which make no assumption about the network structure, thus providing the flexibility needed to route on irregular networks. Actually, such an irregularity should be often interpreted as minor modifications of some regular interconnection pattern, such as
Experimental vapor-liquid equilibrium have been measured for the binary system hexane + 2-methoxy... more Experimental vapor-liquid equilibrium have been measured for the binary system hexane + 2-methoxy-2-methylbutane at 50, 75 and 94 kPa, and over the temperature range 321-357 K using a vapor-liquid equilibrium still with circulation of both phases. In addition mixing volumes were determined at 298.15 K and atmospheric pressure with a vibrating tube densimeter, while maximum differential bubble pressure tensiometry was used to measure atmospheric interfacial tensions at 303.15 K. According to experimental results, the mixture exhibits slight positive deviation from ideal behavior over the experimental range. The mixing volumes of the system are positive over the whole mole fraction range, and the interfacial tensions exhibit slight negative deviation from the linear behavior. The vapor-liquid equilibrium data of the binary mixture satisfy the Fredenlund's consistency test and were well correlated using theapproach with the Wohl, NRTL, Wilson and UNIQUAC equations for all the measured isobars. Mixing volumes and interfacial tensions, in turn, were satisfactorily correlated using the Redlich-Kister equation. The experimentally determined phase equilibrium, mixing volume and interfacial tension data were theoretically predicted using the Peng-Robinson Stryjek-Vera equation of state (EoS), which was extended to mixtures using the modified Huron-Vidal mixing rule. In such an approximation, theapproach was directly linked to the Square Gradient Theory, while the experimental excess Gibbs energy data were directly transferred to the EoS model for calculation purposes. According to the results, accurate predictions of the experimental data were obtained for the vapor-liquid equilibrium and interfacial tensions, while qualitatively correct results were obtained for the mixing volumes.
ABSTRACT Isobaric vapor–liquid equilibrium data at 50, 75, and 94kPa have been determined for the... more ABSTRACT Isobaric vapor–liquid equilibrium data at 50, 75, and 94kPa have been determined for the binary system ETBE+propan-1-ol, in the temperature range 325–368K. The measurements were made in a vapor–liquid equilibrium still with circulation of both phases. Mixing volumes have been also determined from density measurements at 298.15K and 101.3kPa and, at the same temperature and pressure, the dependence of interfacial tension on concentration has been measured using the pendant drop technique. According to experimental results, the mixture presents positive deviation from ideal behavior and azeotropy is present at 75 and 94kPa. No azeotrope was detected at 50kPa. The mixing volumes of the system are negative over the whole mole fraction range, and the interfacial tensions exhibit negative deviation from the linear behavior. The activity coefficients and boiling points of the solutions were well correlated with the mole fraction using the Wohl, Wilson, NRTL, UNIQUAC equations. Excess volume data and interfacial tensions were correlated using the Redlich–Kister model.
Networks that have optical fibre and coaxial cable as support for signal distribution are HFC net... more Networks that have optical fibre and coaxial cable as support for signal distribution are HFC networks. They are used to build a broadband network. This paper treats a HFC Network monitoring system for estimating fault location in transmission or distribution systems by collecting fault information from cable modems installed at customer locations.
Congenital Zika virus (ZIKV) exposure results in a spectrum of disease ranging from severe birth ... more Congenital Zika virus (ZIKV) exposure results in a spectrum of disease ranging from severe birth defects to delayed onset neurodevelopmental deficits. ZIKV-related neuropathogenesis, predictors of birth defects, and neurodevelopmental deficits are not well defined in people. Here we assess the methodological and statistical feasibility of a congenital ZIKV exposure macaque model for identifying infant neurobehavior and brain abnormalities that may underlie neurodevelopmental deficits. We inoculated five pregnant macaques with ZIKV and mock-inoculated one macaque in the first trimester. Following birth, growth, ocular structure/function, brain structure, hearing, histopathology, and neurobehavior were quantitatively assessed during the first week of life. We identified the typical pregnancy outcomes of congenital ZIKV infection, with fetal demise and placental abnormalities. We estimated sample sizes needed to define differences between groups and demonstrated that future studies qua...
Human pegivirus (HPgV)-formerly known as GB virus C and hepatitis G virus-is a poorly characteriz... more Human pegivirus (HPgV)-formerly known as GB virus C and hepatitis G virus-is a poorly characterized RNA virus that infects about one-sixth of the global human population and is transmitted frequently in the blood supply. We create an animal model of HPgV infection by infecting macaque monkeys with a new simian pegivirus (SPgV) discovered in wild baboons. Using this model, we provide a high-resolution, longitudinal picture of SPgV viremia where the dose, route, and timing of infection are known. We detail the highly variable acute phase of SPgV infection, showing that the viral load trajectory early in infection is dependent on the infecting dose, whereas the chronic-phase viremic set point is not. We also show that SPgV has an extremely low propensity for accumulating sequence variation, with no consensus-level variants detected during the acute phase of infection and an average of only 1.5 variants generated per 100 infection-days. Finally, we show that SPgV RNA is highly concentra...
Proceedings of the 3rd ACM/IEEE Symposium on Architecture for networking and communications systems - ANCS '07, 2007
Scheduling in large switches is challenging. Arbiters must operate at high rates to keep up with ... more Scheduling in large switches is challenging. Arbiters must operate at high rates to keep up with the high switching rates demanded by multi-gigabit-per-second link rates and short cells. Low-latency requirements of some applications also challenge the design of schedulers. In this paper, we propose the Parallel Wrapped Wave Front Arbiter with Fast Scheduler (PWWFA-FS). We analyze its performance, present simulation results, discuss its implementation, and show how this scheme can provide low latency under light load while scaling to large switches with multi-terabit-per-second throughput and hundreds of ports.
15th EUROMICRO International Conference on Parallel, Distributed and Network-Based Processing (PDP'07), 2007
Ethernet is turning out to be a cost-effective solution for building Cluster networks offering co... more Ethernet is turning out to be a cost-effective solution for building Cluster networks offering compatibility, simplicity, high bandwidth, scalability and a good performanceto-cost ratio. Nevertheless, Ethernet still makes inefficient use of network resources (links) and suffers from long failure recovery time due to the lack of a suitable routing algorithm. In this paper we embed an efficient routing algorithm into 802.3 Ethernet technology, making it possible to use off-the-shelf equipment to build high-performance and costeffective Ethernet clusters, with an efficient use of link bandwidth and with fault tolerant capabilities. The algorithm, referred to as Segment-Based Routing (SR), is a deterministic routing algorithm that achieves high performance without the need for virtual channels (not available in Ethernet). Moreover, SR is topology agnostic, meaning it can be applied to any topology, and tolerates any combination of faults derived from the original topology when combined with static reconfiguration. Through simulations we verify an overall improvement in throughput by a factor of 1.2 to 10.0 when compared to the conventional Ethernet routing algorithm, the Spanning Tree Protocol (STP), and other topology agnostic routing algorithms such as Up*/Down* and Tree-based Turn-prohibition, the last one being recently proposed for Ethernet.
Proceedings 20th IEEE International Parallel & Distributed Processing Symposium, 2006
Computers get faster every year, but the demand for computing resources seems to grow at an even ... more Computers get faster every year, but the demand for computing resources seems to grow at an even faster rate. Depending on the problem domain, this demand for more power can be satisfied by either, massively parallel computers, or clusters of computers. Common for both approaches is the dependence on high performance interconnect networks such as Myrinet, Infiniband, or 10 Gigabit Ethernet. While high throughput and low latency are key features of interconnection networks, the issue of faulttolerance is now becoming increasingly important. As the number of network components grows so does the probability for failure, thus it becomes important to also consider the fault-tolerance mechanism of interconnection networks. The main challenge then lies in combining performance and fault-tolerance, while still keeping cost and complexity low. This paper proposes a new deterministic routing methodology for tori and meshes, which achieves high performance without the use of virtual channels. Furthermore, it is topology agnostic in nature, meaning it can handle any topology derived from any combination of faults when combined with static reconfiguration. The algorithm, referred to as Segment-based Routing (SR), works by partitioning a topology into subnets, and subnets into segments. This allows us to place bidirectional turn restrictions locally within a segment. As segments are independent, we gain the freedom to place turn restrictions within a segment independently from other segments. This results in a larger degree of freedom when placing turn restrictions compared to other routing strategies. In this paper a way to compute segment-based routing tables is presented and applied to meshes and tori. Evaluation results show that SR increases performance by a factor of 1.8 over FX and up*/down* routing.
International Journal of Parallel Programming, 2010
Networks on Chip (NoCs) have been shown as an efficient solution to the complex on-chip communica... more Networks on Chip (NoCs) have been shown as an efficient solution to the complex on-chip communication problems derived from the increasing number of processor cores. One of the key issues in the design of NoCs is the reduction of both area and power dissipation. As a result, two-dimensional meshes have become the preferred topology, since it offers low and constant link delay. Unfortunately, manufacturing defects or even real-time failures often make the resulting topology to become irregular, preventing the use of traditional routing algorithms. This scenario shows the need for topology-agnostic routing algorithms that provide a valid routing solution when applied over any topology. This paper proposes a new communication-driven routing technique that optimizes the network performance for Application-Specific NoCs. This technique combines a flexible, topology-agnostic routing algorithm with a communication-aware mapping technique that matches the traffic generated by the application with the available network bandwidth. Since the mapping technique can be pruned as needed in order to fit either quality function values or time constraints, this technique can be adapted to fit with different computational costs. The evaluation results show that it significantly improves network performance in terms of both latency and power consumption.
We performed systematic experiments on the synthesis of layered crystal α-ZrP and revealed the co... more We performed systematic experiments on the synthesis of layered crystal α-ZrP and revealed the control of size, aspect ratio and size polydispersity of disk-shaped crystals. The growth of the disks is mediated by oriented attachment, taking place continuously throughout the hydrothermal treatment between various sized disks. The master of the synthesis of layered crystals will contribute to various applications such as the nanocomposites and liquid crystals.
2008 37th International Conference on Parallel Processing, 2008
The topology, the routing algorithm and the way the traffic pattern is distributed over the netwo... more The topology, the routing algorithm and the way the traffic pattern is distributed over the network influence the ultimate performance of the interconnection network. Offchip high-performance interconnects provide mechanisms to support irregular topologies, whereas in on-chip networks the topology is fixed at design time. Continuous trend on device miniaturization and high volume manufacturing increase the probability of faults in embedded systems, leading to irregular topologies. Also, partitionability and virtualization of the entire on-chip network is envisioned for future systems. These trends lead to the need of routing algorithms that adapt to the static or dynamic changes in irregular topologies. In this paper we analyze the benefits of the reconfiguration at the routing algorithm level in order to allow topology changes. That is, support topology changes that appear on the network due to different reasons including switch or link failures, energy reduction decisions or design and manufacturing issues. We perform an exhaustive analysis on the performance impact of the routing algorithm in a NoC system. Our aim is to enable the possibility of reconfiguration of the routing algorithm. We take advantage on the flexibility offered by the segment-based routing methodology that allows a fast computation of many deadlock-free routing algorithms by obtaining different segmentation processes and routing restriction policies. This study analyzes the potentials offered by SR. Results show that the election of the routing algorithm may greatly affect the final performance of the network. Additionally, we propose an organized segmentation process that achieves reliable performance with low variability for all topologies studied under uniform traffic conditions. These results encourages us to the search of a dynamic mechanism that adapts the routing algorithm to the traffic.
2014 IEEE International Conference on Consumer Electronics (ICCE), 2014
ABSTRACT Video game production is facing challenges related to the need to increase consideration... more ABSTRACT Video game production is facing challenges related to the need to increase consideration of player characteristics from the user perspective. This paper presents an initial proposal of factors that may be considered so that video games can be more user-centered. For example, we mention managing affective characteristics and relating player emotions to aspects of video game characters and other entities.
SPE International Conference on Health, Safety and Environment in Oil and Gas Exploration and Production, 2010
The oil and gas industry has reached a plateau in many of its health, safety, and environment (HS... more The oil and gas industry has reached a plateau in many of its health, safety, and environment (HSE) indicators. Statistics show that over the last five years the industry has not experienced a significant reduction in either the number or severity of accidents, despite the investment of considerable effort and money. Influencing employee behavior has been identified as the key factor for resuming performance improvement, with several organizations adopting systems to tackle the challenge using behavior-based safety programs. In the opinion of the authors, most of these programs have had limited effectiveness due their being implemented in isolation, rather than integrated into an overall management system. This paper shows how a corporate program in an oilfield services company has been fully integrated into the organization's HSE culture with an innovative approach: humanizing the management system. The paper describes the vision and strategy to bring implementation of the mana...
The cottontail rabbit papillomavirus (CRPV) / rabbit model has proved useful for the investigatio... more The cottontail rabbit papillomavirus (CRPV) / rabbit model has proved useful for the investigation of prophylactic and therapeutic vaccines and for the study of the pathogenesis of papillomavirus infection. It is currently the only animal model in which the entire viral program can be recapitulated, including progression to cancer. CRPV DNA is infectious in domestic rabbits and therefore mutants can be studied without the need to generate corresponding viruses. Although the CRPV animal model is used widely in various laboratories, no optimized or standardized method is used for creating CRPV viral and especially DNA infections. These different methods have made it difficult for investigators to compare results from laboratory to laboratory. A simple and highly efficient method is reported here; it has been refined based on previous methodology for the production of CRPV infections from both virus and plasmid DNA. This method can be adapted easily by other investigators in the field. The resulting standardization will aid in the evaluation of data from different laboratories.
Concentration profiles, interface thickness, and interface tensions have been calculated for mixt... more Concentration profiles, interface thickness, and interface tensions have been calculated for mixtures applying the gradient theory to the Peng-Robinson equation of state. The approach is based on an accurate local fit of vapor-liquid equilibrium (VLE) data, and, for this purpose, the flexibility of the original Wong-Sandler mixing rule has been taken into account. Correlation and prediction capabilities of experimental interfacial tension data are analyzed for the quadratic mixing rule and the present approach. The method, which is discussed in detail in this work, provides an improved scheme for calculating interfacial properties, both for polar and nonpolar mixtures. According to results, a better correlation and prediction of the interfacial tensions can be obtained from an adequate interpolation of the VLE, using simple cubic equations of state. Examples are presented for binary and ternary mixtures.
I Q U I D equilibrium data for the ternary chloroform-methanol-ethyl acetate system and its three... more I Q U I D equilibrium data for the ternary chloroform-methanol-ethyl acetate system and its three component binary systems a t atmospheric pressure were determined as part of a continuing study of relationships for ternary systems which are prerequisite in the design of multicomponent distillation equipment. This ternary system was chosen for two reasons: to confirm whether the ternary system exhibits an azeotrope, as the binary chloroform-methanol and the methanol-ethyl acetate systems form a minimum boiling point azeotrope (4, 10, 13); and to examine whether ternary constants are needed in the calculation of the ternary vapor-liquid equilibria from data on the binary systems. EXPERIMENTAL Purity of Compounds. The compounds supplied for this work were first grade (Japanese Industrial Standards) materials. Chloroform was purified by distilling in a glass column packed with McMahon packings. Methanol was distilled in the same column. Ethyl acetate was washed with distilled water three times to remove alcohol and treated by drying over anhydrous potassium carbonate and distilled in the same column. In distillation the predistillate and residue liquids, each approximately one-sixth of the charge, were discarded, and the heart cut 'used for experimental work. Proper precautions minimized absorption of atmospheric moisture by methanol and ethyl acetate. The properties of the purified compounds are listed in Table I together with reliable literature values. Analytical Method. Density and refractive index were used as means of analyses of the unknown binary and ternary mixtures. Densities were determined using 10-ml. pycnometers with graduated arms a t 25" f 0.1" C. Measurements
The shield region is a singular range of the global phase diagram (GPD), where equations of state... more The shield region is a singular range of the global phase diagram (GPD), where equations of state based on mean-field theories predict a quadruple point (QP) for fluid binary mixtures. The QP in question is characterized by three immiscible liquids and a vapor in equilibrium. No experimental system has been found exhibiting such an equilibrium behavior. In this theoretical study the interfacial and wetting behavior of the phases that coexist at the QP by applying the gradient theory to the van der Waals equation of state is described.
Industrial & Engineering Chemistry Research, 2014
We present a corresponding states correlation based on the description of fluid phase properties ... more We present a corresponding states correlation based on the description of fluid phase properties by means of an Mie intermolecular potential applied to tangentially bonded spheres. The macroscopic properties of this model fluid are very accurately represented by a recently proposed version of the Statistical Associating Fluid Theory (the SAFT-γ version). The Mie potential can be expressed in a conformal manner in terms of three parameters that relate to a length scale, σ, an energy scale, ε, and the range or functional form of the potential, λ, while the nonsphericity or elongation of a molecule can be appropriately described by the chain length, m. For a given chain length, correlations are given to scale the SAFT equation of state in terms of three experimental parameters: the acentric factor, the critical temperature, and the saturated liquid density at a reduced temperature of 0.7. The molecular nature of the equation of state is exploited to make a direct link between the macroscopic thermodynamic parameters used to characterize the equation of state and the parameters of the underlying Mie potential. This direct link between macroscopic properties and molecular parameters is the basis to propose a top-down method to parametrize force fields that can be used in the coarse grained molecular modeling (Monte Carlo or molecular dynamics) of fluids. The resulting correlation is of quantitative accuracy and examples of the prediction of simulations of vapor−liquid equilibria and interfacial tensions are given. In essence, we present a recipe that allows one to obtain intermolecular potentials for use in the molecular simulation of simple and chain fluids from macroscopic experimentally determined constants, namely the acentric factor, the critical temperature, and a value of the liquid density at a reduced temperature of 0.7. av 2 3 av 3 (3) where N av is Avogadro's number. Comparing eqs 2 and 3 one can immediately establish a link between the macroscopic
IEEE Transactions on Parallel and Distributed Systems, 2012
Most standard cluster interconnect technologies are flexible with respect to network topology. Th... more Most standard cluster interconnect technologies are flexible with respect to network topology. This has spawned a substantial amount of research on topology-agnostic routing algorithms, which make no assumption about the network structure, thus providing the flexibility needed to route on irregular networks. Actually, such an irregularity should be often interpreted as minor modifications of some regular interconnection pattern, such as
Experimental vapor-liquid equilibrium have been measured for the binary system hexane + 2-methoxy... more Experimental vapor-liquid equilibrium have been measured for the binary system hexane + 2-methoxy-2-methylbutane at 50, 75 and 94 kPa, and over the temperature range 321-357 K using a vapor-liquid equilibrium still with circulation of both phases. In addition mixing volumes were determined at 298.15 K and atmospheric pressure with a vibrating tube densimeter, while maximum differential bubble pressure tensiometry was used to measure atmospheric interfacial tensions at 303.15 K. According to experimental results, the mixture exhibits slight positive deviation from ideal behavior over the experimental range. The mixing volumes of the system are positive over the whole mole fraction range, and the interfacial tensions exhibit slight negative deviation from the linear behavior. The vapor-liquid equilibrium data of the binary mixture satisfy the Fredenlund's consistency test and were well correlated using theapproach with the Wohl, NRTL, Wilson and UNIQUAC equations for all the measured isobars. Mixing volumes and interfacial tensions, in turn, were satisfactorily correlated using the Redlich-Kister equation. The experimentally determined phase equilibrium, mixing volume and interfacial tension data were theoretically predicted using the Peng-Robinson Stryjek-Vera equation of state (EoS), which was extended to mixtures using the modified Huron-Vidal mixing rule. In such an approximation, theapproach was directly linked to the Square Gradient Theory, while the experimental excess Gibbs energy data were directly transferred to the EoS model for calculation purposes. According to the results, accurate predictions of the experimental data were obtained for the vapor-liquid equilibrium and interfacial tensions, while qualitatively correct results were obtained for the mixing volumes.
ABSTRACT Isobaric vapor–liquid equilibrium data at 50, 75, and 94kPa have been determined for the... more ABSTRACT Isobaric vapor–liquid equilibrium data at 50, 75, and 94kPa have been determined for the binary system ETBE+propan-1-ol, in the temperature range 325–368K. The measurements were made in a vapor–liquid equilibrium still with circulation of both phases. Mixing volumes have been also determined from density measurements at 298.15K and 101.3kPa and, at the same temperature and pressure, the dependence of interfacial tension on concentration has been measured using the pendant drop technique. According to experimental results, the mixture presents positive deviation from ideal behavior and azeotropy is present at 75 and 94kPa. No azeotrope was detected at 50kPa. The mixing volumes of the system are negative over the whole mole fraction range, and the interfacial tensions exhibit negative deviation from the linear behavior. The activity coefficients and boiling points of the solutions were well correlated with the mole fraction using the Wohl, Wilson, NRTL, UNIQUAC equations. Excess volume data and interfacial tensions were correlated using the Redlich–Kister model.
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Papers by Andres Mejia