Artículos de conferencia

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1-D memristor-based cellular automaton for pseudo-random number generation
(IEEE, 2017) Karamani, Rafailia Eleni; Ntinas, Vasileios; Vourkas, Ioannis; Sirakoulis, Georgios C.
Cellular Automata (CAs) is a well-known parallel, bio-inspired, computational model. It is based on the capability of simpler, locally interacting units, i.e. the CAs cells, to evolve in time, giving rise to emergent computation, suitable to model physical system behavior, prediction of natural phenomena and multi-dimensional problem solutions. Moreover, at the same time CAs constitute a promising computing platform, beyond the von Neumann architecture. In this paper, a memristor device is considered to be the basic module of a CA cell circuit implementation, performing as a combined memory and processing element to implement CA-based circuits, able to model sufficiently systems and applications as mentioned above, targeting tentatively to a more energy efficient design compared to the conventional electronics. In particular and as a proof of concept, the results of elementary CAs modeling and simulation for the generation of pseudo-random numbers are presented using a 1-D memristor-based CAs array to illustrate the robustness and the efficacy of the proposed computing approach.
1-THz bandwidth of 70-krad/s endless optical polarization control
(2014) Koch, Benjamin; Noe, Reinhold; Mirvoda, Vitali; Sandel, David
112Gb/s PolMux RZ-DQPSK with fast polarization tracking based on interference control
(2009) Wernz, H.; Bayer, S.; Olsson, B.E.; Camera, M.; Griesser, H.; Furst, C.; Koch, Benjamin; Mirvoda, V.; Hidayat, A.; Noe, R.
12 krad/s endless polarization stabilization with lithium niobate component
(2008) Koch, Benjamin; Hidayat, A.; Zhang, H.; Mirvoda, V.; Lichtinger, M.; Sandel, D.; Noé, R.
140-krad/s, 254-Gigaradian endless optical polarization tracking, independent of analyzed output polarization
(2012) Koch, Benjamin; Noé, R.; Mirvoda, V.; Sandel, D.
2-methoxiestradiol induces apoptosis in gynecologic cancer cells but not in normal cell lines established from reproductive tissues.
(ELSEVIER SCIENCE INC, 2006) Cuello, MA; Kato, S; Sadarangani, A; Espinoza, N; Lange, S; Villalon, M; Owen, G
200-Gb/s, 430-km PDM-RZ-DQPSK (4 bit/symbol) transmission with 10 krad/s endless polarization tracking
(2010) Koch, Benjamin; Noé, R.; Sandel, D.; Mirvoda, V.; Filsinger, V.; Puntsri, K.
23-Level Inverter for EVs Using Only One Power Supply and Series Active Filters
(2012) Pereda Torres, Javier
27-level converter for electric vehicles using only one power supply
(IEEE, 2010) Dixon Rojas, Juan; Pereda Torres, Javier Eduardo
The main advantage of asymmetrical multilevel inverters is the optimization of levels with a minimum number of power supplies. However, this optimized multilevel system still needs a large number of isolated and floating DC supplies, which makes these converters complicated to implement in electric vehicles (EVs), because the system will require many independent battery packs. In this paper, a very simple scheme, based on a small and cheap high frequency link (HFL), allows the utilization of only one power supply for the complete multilevel inverter drive, with an inherent regulation of the voltages supplied among the H-bridges. It also allows voltage control with full number of levels if the DC power supply is of variable voltage characteristic. This work is focused on a 27-level asymmetric inverter but the strategy, using only one power supply, can be applied to converters with any number of levels. In particular, an asymmetrical 27-level converter needs nine isolated power supplies and the proposed system reduces these nine sources to only one: the battery car. The topology also permits full regenerative braking working as a three-level converter. The proposed system is intended for application in electric vehicles from power ratings up to 150 kW. Simulations and experimental results show the feasibility to implement this â€œone-sourceâ€ multilevel system.
3-D CNC trajectory interpolation using Bresenham's algorithm
(IEEE, 1994) Chiang Sánchez, Luciano Eduardo
This article describes a 3D extension of Bresenham's algorithm and its implementation in the linear trajectory interpolation of CNC paths. The resulting algorithm has been successfully applied to a CNC milling machine that uses stepper motors as actuators, resulting in minimal contour errors for a given step motor resolution. A numerical control system that uses the algorithm implementation has been built as part of a wider effort which is to test the feasibility of building or retrofitting machine tools with CNC capabilities at an affordable price tag for a developing country.<>
3-Epi-25 Serum 25-Hydroxyvitamin D3 Concentrations in Chilean Children Between 5 and 8 Years
(KARGER, 2018) Arancibia, Monica; Seiltgens, Cristian; Poggi, Helena; Allende, Fidel; Solari, Sandra; Peredo, Soledad; Trincado, Claudia; Garcia, Hernan; Moore, Rosario; Dapremont, Ivonne; Andrade, Daniela; Sifaqui, Sofia; Ossa, Jt; Campino, Carmen; Carvajal, Cristian; Fardella, Carlos; Baudrand, Rene; Sanchez, Ximena; Martinez Aguayo, Alejandro
32-Krad/s polarization and 3-dB PDL tracking in a realtime digital coherent polarization-multiplexed QPSK receiver
(2008) Pfau, T.; El-Darawy, M.; Wördehoff, C.; Peveling, R.; Hoffmann, S.; Koch, Benjamin; Adamczyk, O.; Porrmann, M.; Noé, R.
40 dB crosstalk suppression in high-precision endless polarization control
(2014) Koch, Benjamin; Noé, Reinhold; Mirvoda, Vitali; Sandel, Daniel; Panhwar, M. F.
805 Complications of Gastrointestinal Endoscopy in 85,391 Procedures
(Mosby-Elsevier, 2012) Espino Espino, Alberto Antonio; García Astorquiza, Ximena Andrea; Mac Namara, Macarena; Richter Roca, Hugo Michael; Pimentel Muller, Fernando; Biel Morales, Francisco Javier; Robles García, Camila Fernanda; Callejas, Matías F.; Sharp Pittet, Allan Carlos; Donoso, Andrés; Candia Balboa, Roberto Andrés; González Donoso, Robinson; Jarufe Cassis, Nicolás; Arrese, Marco; Álvarez Lobos, Manuel; Padilla Pérez, Oslando
Background: Complications are inherent to GI endoscopy (GIE) and do not necessarily imply endoscopist's negligence. They may occur even using highest standards of practice. Objectives: To analyze the frequency and severity of complications occurring within 30 days after of the GIE at a single university hospital in Chile. Methods: We reviewed the records about patients who underwent GIE from January 2001 through May 2011. Results: A total of 85,391 GIE were evaluated. Procedures: 46,928 (55%) esophagogastroduodenoscopy (EGD); 27,993 (32.8%) diagnostic colonoscopies; 1427 (1.7%) polypectomies; and other procedures (hemostasis, variceal band ligation (VBL), foreign-body removal, dilation, stents, PEG, ERCP, EUS and double balloon endoscopy) 9043 (10.5%). A total of 299 complications were associated with GIE (59 % female, mean age 63 years, range 5 - 99). The overall complications rate was 0.35% (cardiopulmonary (CP) 0.1%, bleeding 0.07%, perforation 0.06%, infection 0.04%, pancreatitis 0.03% and other). The overall complication rate was higher in therapeutic procedures (TP) vs diagnostic procedures (DP) (2.7% v/s 0.16%, p<0.0001). The percentage of severe complications was higher in TP vs DP (52.3% vs 28.4%, p<0.0001). The overall complication rate for EGD was 0.14% (CP 0.07%, perforation 0.017%, bleeding 0.019%); diagnostic colonoscopy, 0.27% (CP 0.1%, perforation 0.06%, bleeding 0.02%); and polypectomy, 1.8% (CP 0.14%, perforation 0.28%, bleeding 0.98%). A total of 15 deaths occurred (overall rate 0.018%, 83% in TP). The overall mortality rate was higher in TP vs DP (0.2% v/s 0.003%, p<0.0001). The mortality rate for PEG was 0.7%; VBL 0.4%; ERCP 0.2%; diagnostic colonoscopy 0.004%; EGD 0.004%; and polypectomy 0%. Conclusions: GIE is associated with complications and mortality. The severity and risk of complications are higher in therapeutic procedures. These risks should be clearly explained to patients and their family before the procedure.
A baseline restorer for charge-sensitive amplifiers in a 500-nm CMOS process
(IEEE, 2018) Abusleme Hoffman, Ángel Christian; Barraza Altamirano, Renzo Ignacio; Kuleshov, S.
Charge-sensitive amplifiers (CSAs), widely used as front-ends in pulse processors for capacitive detectors, require a feedback network to set the operation point, deal with leakage currents and restore the baseline voltage upon the arrival of signals. Passive feedback networks are simple and reliable solutions that accomplish the task, but cannot modify the operation point in order to accommodate an input with different polarity, and do not offer sufficient flexibility to deal with a wide range of leakage current or input rates. The Krummenacher feedback solves these drawbacks at the cost of a large compensation capacitor, which is required for stability purposes. In this work, a novel configurable feedback network is presented. Based on the same principle as the Krummenacher network, this circuit relies on the design parameters to ensure stability. This work shows analysis, design and test results from a recent implementation in a 500-nm CMOS process.
A beam model applicable to small fields: Development and validation
(2009) Caprile Etchart, Paola F.; Hartmann, G.H.
A Blind Calibration Scheme for Switched-Capacitor Pipeline Analog-to-Digital Converters
(IEEE, 2020) Bozzo Jiménez Juan Andrés; Abusleme Hoffman, Ángel Christian; Martinez, J. S.
A foreground calibration algorithm is proposed to digitally self-calibrate a switched-capacitor (SC), pipelined, analog-to-digital converter (ADC). Static errors resulting from capacitor mismatch, charge transfer loss (from limited amplifier dc gain) and variance in Multiplying DAC (MDAC) voltages are estimated and compensated for. The proposed algorithm reuses the electrical components of the pipeline stages to instantiate Î”Î£ converters in the stages' interfaces. By feeding to those converters self-generated input signals and storing the output stream of codes, the algorithm is able to infer the electrical parameters of the reused elements. The algorithm does not require external stimulus or specialized circuitry to be used as true ground but depends on the stages sub-ADC threshold levels precision, diminishing its performance in circuits where error is dominated by sub-ADC input offset. A number of 10-bit ADC's with a mean uncalibrated Effective Number Of Bits (ENOB) of 6.3 bits where simulated, and a resolution improvement between 2.5 bits, for the best case, and 1 bit for the worst, were observed.
A characterization of cancer vasculogenic mimicry: Extracellular matrix induced cellular signaling to lumen formation.
(AMER ASSOC CANCER RESEARCH, 2021) Mingo, Gabriel; Valdivia, Andres; Aldana, Varina; Pradenas, Javiera; Babbitt, Nicole; Gonzalez, Pamela; Nualart, Francisco; Diaz, Jorge; Leyton, Lisette; Bertocchi, Cristina; Owen, Gareth
A comparison of gradient versus color and texture analysis for lane detection and tracking
(IEEE, 2009) Tapia Espinoza, Rodolfo Antonio; Torres Torriti, Miguel Attilio
Accurate lane detection in real-time is a critical task in autonomous vehicle guidance and lane departure warning for driver assistance. Existing vision-based approaches rely mostly on some analysis of the spatial gradient of the image. However, if the road structure is not regular and well delimited, edges may not be easy to extract and other features must be employed. This paper evaluates the use of color and textural features as a way to improve the standard gradient-based lane detection. Textural features are generated using a bank of Gabor filters. A benefit of using color and texture is that the sky regions of the image, as well as side elements, can be detected. The results obtained from testing the approaches on city roads show that color and texture analysis yields a more accurate road segmentation.
A Comparison of Path Planning Algorithms for Omni-Directional Robots in Dynamic Environments
(IEEE, 2006) Haro, F.; Torres Torriti, Miguel Attilio
The scope of this paper is to analyze and compare three path planning methods for omni-directional robots, which are based on a) the bug algorithm, b) the potential fields algorithm, and c) the A* algorithm for minimum cost path with multiresolution grids. The approaches are compared in terms of computational costs and the resulting path lengths. Results obtained indicate that the bug algorithm is a suitable choice for this type of application as its computational cost is lower than that of the other methods. Furthermore, minor modifications of the standard bug algorithm, such as the tangent following modification, allow the path planner to handle well the situations encountered in typical multi-robot environments

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