Papers by Jorge Perez Garcia
DYNA
Spain occupies a prominent position among the countries with the most UNESCO World Heritage Sites... more Spain occupies a prominent position among the countries with the most UNESCO World Heritage Sites. The possibilities offered by the application of AR-VR technologies for some of these elements’ virtual reconstruction brings a great opportunity to give visibility and support the transmission of cultural heritage, especially in those cases where physical restoration is not possible. It is increasingly common to find virtual reconstructions of monuments, since these do not damage either put at risk the element being represented. In this work, the process of modelling and reconstructing the Castillo de la Estrella, located in the town of Teba (Malaga), as well as the subsequent development of an Augmented Reality application is presented. This allows the Castillo de la Estrella reconstruction to be displayed virtually on mobile devices such as smartphones or tablets, and might potentially be implemented in the museum that houses the castle itself, providing a tool that improves the visi...
Physical Review Applied, 2020
We describe a new method for the rapid determination of the mass of particles confined in a free-... more We describe a new method for the rapid determination of the mass of particles confined in a free-space optical dipole-force trap. The technique relies on direct imaging of drop-and-restore experiments without the need for a vacuum environment. In these experiments, the trapping light is rapidly shuttered with an acousto-optic modulator causing the particle to be released from and subsequently recaptured by the trapping force. The trajectories of both the falls and restorations, imaged using a high-speed CMOS sensor, are combined to determine the particle mass. We corroborate these measurements using an analysis of position autocorrelation functions of the trapped particles. We report a statistical uncertainty of less than 2% for masses on the order of 5 × 10 −14 kg using a data acquisition time of approximately 90 seconds.
Tierras De Castilla Y Leon Ganaderia, 2007
Universidad Ciencia Y Tecnologia, Apr 17, 2012
A pesar de que en la literatura se reportan numerosos trabajos relacionados con modelos de propag... more A pesar de que en la literatura se reportan numerosos trabajos relacionados con modelos de propagación desarrollados para predicción de cobertura en la banda no licenciada de redes inalámbricas de datos de 2,4 GHz, tanto en ambientes interiores como en ambientes exteriores, ninguno de ellos se refiere a condiciones de propagación (morfología, topografía, propiedades atmosféricas, entre otras) típicas de Venezuela o similares. En este sentido, en el presente artículo se desarrolla un modelo para ambientes exteriores, basado en mediciones realizadas en las ciudades de Mérida (Venezuela) y Cúcuta (Colombia), ciudad ésta con características de propagación similares a algunas ciudades de Venezuela, tal como San Cristóbal. El modelo obtenido presenta un mejor desempeño, en términos del error relativo, que los modelos de la literatura con los que fue comparado.
Ginecol Obstet Mex, Aug 1, 1998
GLOBECOM '03. IEEE Global Telecommunications Conference (IEEE Cat. No.03CH37489)
In order to support the enormous growth of the Internet, innovative research in every router's su... more In order to support the enormous growth of the Internet, innovative research in every router's subsystem is needed. In this paper we focus our attention on packet buffer design for routers supporting high-speed line rates. More specifically, we address the design of packet buffers using Virtual Output Queuing (VOQ) discipline, which are used in most modern router architectures. The design is based on a previously proposed scheme that uses a combination of SRAM and DRAM modules. We propose a storage scheme that achieves a conflict-free memory bank organization. This leads to a reduction of the granularity of DRAM accesses, resulting in a decrease of storage capacity needed by the SRAM. In the DRAM/SRAM scheme, SRAM memory bandwidth needs to fit the line rate. Since memory bandwidth is limited by its size, searching for memory schemes having a small SRAM size arises as an essential issue for high speed line rates (e.g. OC768, 40 Gbps and OC3072, 160 Gbps).
IEEE International Symposium on Performance Analysis of Systems and Software, 2005. ISPASS 2005., 2005
In this paper we study the properties of a new packet trace compression method based on clusterin... more In this paper we study the properties of a new packet trace compression method based on clustering of TCP flows. With our proposed method, the compression ratio that we achieve is around 3%, reducing the file size, for instance, from 100 MB to 3 MB. Although this specification defines a lossy compressed data format, it preserves important statistical properties present into original trace. In order to validate the method, memory performance studies were done with the Radix Tree algorithm executing a trace generated by our method. To give support to these studies, measurements were taken of memory access and cache miss ratio. For the time, the results have showed that our proposed method provides a good solution for packet trace compression.
Veterinary Microbiology, 2015
The most common animal models used to study Clostridium perfringens infections in humans and anim... more The most common animal models used to study Clostridium perfringens infections in humans and animals are reviewed here. The classical C. perfringens-mediated histotoxic disease of humans is clostridial myonecrosis or gas gangrene and the use of a mouse myonecrosis model coupled with genetic studies has contributed greatly to our understanding of disease pathogenesis. Similarly, the use of a chicken model has enhanced our understanding of type A-mediated necrotic enteritis in poultry and has led to the identification of NetB as the primary toxin involved in disease. C. perfringens type A food poisoning is a highly prevalent bacterial illness in the USA and elsewhere. Rabbits and mice are the species most commonly used to study the action of enterotoxin, the causative toxin. Other animal models used to study the effect of this toxin are rats, non-human primates, sheep and cattle. In rabbits and mice, CPE produces severe necrosis of the small intestinal epithelium along with fluid accumulation. C. perfringens type D infection has been
EUROSENSORS XVI Conference, 2004
The fabrication and characterization of an optical accelerometer based on silicon technology and ... more The fabrication and characterization of an optical accelerometer based on silicon technology and using BESOI wafers is presented. Instead of the standard total internal reflection (TIR) waveguides, AntiResonant Reflecting Optical Waveguides (ARROW) have been used. On the basis of a quad beam accelerometer design, a sensing waveguide has been placed on the seismic mass. Its misalignment with the waveguides located at the frame allows measuring the acceleration. The mechanical structure has been designed so as to have a span of 2 m, that should provide with a sensitivity of 4.6 dB/g. Reference waveguides measured by end-fire coupling have low radiation and insertion losses (0.3 and 2.5 dB, respectively). High insertion losses are observed due to imperfections in polishing when V-grooves with glass anodic bonding are used. This fact causes the reduction of its sensibility to 2.3 dB/g.
2011 IEEE 19th Annual International Symposium on Modelling, Analysis, and Simulation of Computer and Telecommunication Systems, 2011
As the evolution of multi-core multi-threaded processors continues, the complexity demanded to pe... more As the evolution of multi-core multi-threaded processors continues, the complexity demanded to perform an extensive trade-off analysis, increases proportionally. Cycleaccurate or trace-driven simulators are too slow to execute the large amount of experiments required to obtain indicative results. To achieve a thorough analysis of the system, software benchmarks or traces are required. In many cases when an analysis is needed most, during the earlier stages of the processor design, benchmarks or traces are not available. Analytical models overcome these limitations but do not provide the fine grain details needed for a deep analysis of these architectures. In this work we present a new methodology to abstract processor architectures, at a level between cycle-accurate and analytical simulators. To apply our methodology we use queueing modeling techniques. Thus, we introduce Q-MAS, a queueing based tool targeting a real chip (the UltraSPARC T2 processor) and aimed at facilitating the quantification of trade-offs during the design phase of multi-core multi-threaded processor architectures. The results demonstrate that Q-MAS, the tool that we developed, provides accurate results very close to the actual hardware, with a minimal cost of running what-if scenarios.
Proceedings of the 2004 workshop on MEmory performance DEaling with Applications , systems and architecture - MEDEA '04, 2004
The trend of the networking processing is to increase the intelligence of the routers (i.e. secur... more The trend of the networking processing is to increase the intelligence of the routers (i.e. security capacities). This means that there is an increment in the workload generated per packet and new types of applications are emerging, such as stateful programs. On the other hand, Internet traffic continues to grow vigorously. This fact involves an increment of the traffic aggregation levels and overloades the processing capacities of the routers. In this paper we show the importance of traffic aggregation level on networking application studies. We also classify the applications according to the data management of the packet processing. Hence, we present the different impacts on the data cache performance depending on the application category. Our results show that traffic aggregation level may affect the cache performance depending on the networking application category. Stateful applications show a significant sensitivity to this impact.
Proceedings of the 2005 ACM symposium on Architecture for networking and communications systems, 2005
The explosive and robust growth of the Internet owes a lot to the "end-to-end principle", which p... more The explosive and robust growth of the Internet owes a lot to the "end-to-end principle", which pushes stateful operations to the end-points. The Internet grew both in traffic volume, and in the richness of the applications it supports. The growth also brought along new security issues and network monitoring applications. Edge devices, in particular, tend to perform upper layer packet processing. A whole new class of applications require stateful processing. In this paper we study the impact of stateful networking applications on architectural bottlenecks. The analysis covers applications with a variety of statefulness levels. The study emphasizes the data cache behavior. Nevertheless, we also discuss other issues, such as branch prediction and ILP. Additionally, we analyze the architectural impact through the TCP connection life. Our results show an important memory bottleneck due to maintaining the states. Moreover, depending on the target of the application, the memory bottleneck may be concentrated within a set of packets or distributed along the TCP connection lifetime.
Lecture Notes in Computer Science
The explosive and robust growth of the Internet owes a lot to the "end-to-end principle", which p... more The explosive and robust growth of the Internet owes a lot to the "end-to-end principle", which pushes stateful operations to the end-points. The Internet grow both in traffic volume, and in the richness of the applications it supports. A whole new class of applications requires stateful processing. This paper presents the first workload characterization of stateful networking applications. The analysis emphasizes the study of data cache behaviour. Nevertheless, we also discuss other issues, such as branch prediction, instruction distribution and ILP. Another important contribution is the study of the state categories of the networking applications. The results show an important memory bottleneck that involves new challenges to overcome.
Conference on Electron Devices, 2005 Spanish
... Monolithic Microfabricated Valves and Pumps by Multilayer Soft Lithography. Science. Vol288... more ... Monolithic Microfabricated Valves and Pumps by Multilayer Soft Lithography. Science. Vol288. 2000. [4] YungJu Chuang, Fan-Gang Tseng, Jen-Hau Cheng and Wei-Keng Lin. A navel fabrication method of embedded micro-channels by using SU-8 thick-film photoresist. ...
Conference on Electron Devices, 2005 Spanish
ABSTRACT This paper describes the fabrication method of a novel electrodeposited nickel membrane.... more ABSTRACT This paper describes the fabrication method of a novel electrodeposited nickel membrane. Different polymer photoresist and new photolithographic process have been developed and optimised at a wafer level. This low cost technology provides a good alternative to integrate actuated microvalves for flow control in a lab-on-a-chip device.
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Papers by Jorge Perez Garcia