WorldWideScience

Sample records for single-input multiple-output simo

  1. Minimum Symbol Error Rate Detection in Single-Input Multiple-Output Channels with Markov Noise

    DEFF Research Database (Denmark)

    Christensen, Lars P.B.

    2005-01-01

    Minimum symbol error rate detection in Single-Input Multiple- Output(SIMO) channels with Markov noise is presented. The special case of zero-mean Gauss-Markov noise is examined closer as it only requires knowledge of the second-order moments. In this special case, it is shown that optimal detection...

  2. Three-Dimensional Terahertz Coded-Aperture Imaging Based on Single Input Multiple Output Technology

    Directory of Open Access Journals (Sweden)

    Shuo Chen

    2018-01-01

    Full Text Available As a promising radar imaging technique, terahertz coded-aperture imaging (TCAI can achieve high-resolution, forward-looking, and staring imaging by producing spatiotemporal independent signals with coded apertures. In this paper, we propose a three-dimensional (3D TCAI architecture based on single input multiple output (SIMO technology, which can reduce the coding and sampling times sharply. The coded aperture applied in the proposed TCAI architecture loads either purposive or random phase modulation factor. In the transmitting process, the purposive phase modulation factor drives the terahertz beam to scan the divided 3D imaging cells. In the receiving process, the random phase modulation factor is adopted to modulate the terahertz wave to be spatiotemporally independent for high resolution. Considering human-scale targets, images of each 3D imaging cell are reconstructed one by one to decompose the global computational complexity, and then are synthesized together to obtain the complete high-resolution image. As for each imaging cell, the multi-resolution imaging method helps to reduce the computational burden on a large-scale reference-signal matrix. The experimental results demonstrate that the proposed architecture can achieve high-resolution imaging with much less time for 3D targets and has great potential in applications such as security screening, nondestructive detection, medical diagnosis, etc.

  3. Sliding-mode control of single input multiple output DC-DC converter

    Science.gov (United States)

    Zhang, Libo; Sun, Yihan; Luo, Tiejian; Wan, Qiyang

    2016-10-01

    Various voltage levels are required in the vehicle mounted power system. A conventional solution is to utilize an independent multiple output DC-DC converter whose cost is high and control scheme is complicated. In this paper, we design a novel SIMO DC-DC converter with sliding mode controller. The proposed converter can boost the voltage of a low-voltage input power source to a controllable high-voltage DC bus and middle-voltage output terminals, which endow the converter with characteristics of simple structure, low cost, and convenient control. In addition, the sliding mode control (SMC) technique applied in our converter can enhance the performances of a certain SIMO DC-DC converter topology. The high-voltage DC bus can be regarded as the main power source to the high-voltage facility of the vehicle mounted power system, and the middle-voltage output terminals can supply power to the low-voltage equipment on an automobile. In the respect of control algorithm, it is the first time to propose the SMC-PID (Proportion Integration Differentiation) control algorithm, in which the SMC algorithm is utilized and the PID control is attended to the conventional SMC algorithm. The PID control increases the dynamic ability of the SMC algorithm by establishing the corresponding SMC surface and introducing the attached integral of voltage error, which endow the sliding-control system with excellent dynamic performance. At last, we established the MATLAB/SIMULINK simulation model, tested performance of the system, and built the hardware prototype based on Digital Signal Processor (DSP). Results show that the sliding mode control is able to track a required trajectory, which has robustness against the uncertainties and disturbances.

  4. Enhancing Physical Layer Security of Multiuser SIMO Mixed RF/FSO Relay Networks with Multi-Eavesdroppers

    KAUST Repository

    El-Malek, Ahmed H. Abd; Salhab, Anas M.; Zummo, Salam A.; Alouini, Mohamed-Slim

    2017-01-01

    In this paper, we investigate the secrecy performance of multiuser (MU) single-input multiple-output (SIMO) mixed radio frequency (RF)/free space optical (FSO) relay network with opportunistic user scheduling and multiple eavesdropping attacks

  5. Ergodic Capacity for the SIMO Nakagami- Channel

    Directory of Open Access Journals (Sweden)

    Vagenas EfstathiosD

    2009-01-01

    Full Text Available This paper presents closed-form expressions for the ergodic channel capacity of SIMO (single-input and multiple output wireless systems operating in a Nakagami- fading channel. As the performance of SIMO channel is closely related to the diversity combining techniques, we present closed-form expressions for the capacity of maximal ratio combining (MRC, equal gain combining (EGC, selection combining (SC, and switch and stay (SSC diversity systems operating in Nakagami- fading channels. Also, the ergodic capacity of a SIMO system in a Nakagami- fading channel without any diversity technique is derived. The latter scenario is further investigated for a large amount of receive antennas. Finally, numerical results are presented for illustration.

  6. Blind Separation of Acoustic Signals Combining SIMO-Model-Based Independent Component Analysis and Binary Masking

    Directory of Open Access Journals (Sweden)

    Hiekata Takashi

    2006-01-01

    Full Text Available A new two-stage blind source separation (BSS method for convolutive mixtures of speech is proposed, in which a single-input multiple-output (SIMO-model-based independent component analysis (ICA and a new SIMO-model-based binary masking are combined. SIMO-model-based ICA enables us to separate the mixed signals, not into monaural source signals but into SIMO-model-based signals from independent sources in their original form at the microphones. Thus, the separated signals of SIMO-model-based ICA can maintain the spatial qualities of each sound source. Owing to this attractive property, our novel SIMO-model-based binary masking can be applied to efficiently remove the residual interference components after SIMO-model-based ICA. The experimental results reveal that the separation performance can be considerably improved by the proposed method compared with that achieved by conventional BSS methods. In addition, the real-time implementation of the proposed BSS is illustrated.

  7. Optimal non-coherent data detection for massive SIMO wireless systems: A polynomial complexity solution

    KAUST Repository

    Alshamary, Haider Ali Jasim

    2016-01-04

    © 2015 IEEE. This paper considers the joint maximum likelihood (ML) channel estimation and data detection problem for massive SIMO (single input multiple output) wireless systems. We propose efficient algorithms achieving the exact ML non-coherent data detection, for both constant-modulus constellations and nonconstant-modulus constellations. Despite a large number of unknown channel coefficients in massive SIMO systems, we show that the expected computational complexity is linear in the number of receive antennas and polynomial in channel coherence time. To the best of our knowledge, our algorithms are the first efficient algorithms to achieve the exact joint ML channel estimation and data detection performance for massive SIMO systems with general constellations. Simulation results show our algorithms achieve considerable performance gains at a low computational complexity.

  8. Optimal non-coherent data detection for massive SIMO wireless systems: A polynomial complexity solution

    KAUST Repository

    Alshamary, Haider Ali Jasim; Al-Naffouri, Tareq Y.; Zaib, Alam; Xu, Weiyu

    2016-01-01

    © 2015 IEEE. This paper considers the joint maximum likelihood (ML) channel estimation and data detection problem for massive SIMO (single input multiple output) wireless systems. We propose efficient algorithms achieving the exact ML non-coherent data detection, for both constant-modulus constellations and nonconstant-modulus constellations. Despite a large number of unknown channel coefficients in massive SIMO systems, we show that the expected computational complexity is linear in the number of receive antennas and polynomial in channel coherence time. To the best of our knowledge, our algorithms are the first efficient algorithms to achieve the exact joint ML channel estimation and data detection performance for massive SIMO systems with general constellations. Simulation results show our algorithms achieve considerable performance gains at a low computational complexity.

  9. The Best Achievable ℋ2 Tracking Performances for SIMO Feedback Control Systems

    Directory of Open Access Journals (Sweden)

    Shinji Hara

    2007-01-01

    Full Text Available This paper is concerned with the inherent ℋ2 tracking performance limitation of single-input and multiple-output (SIMO linear time-invariant (LTI feedback control systems. The performance is measured by the tracking error between a step reference input and the plant output with additional penalty on control input. We employ the plant augmentation strategy, which enables us to derive analytical closed-form expressions of the best achievable performance not only for discrete-time system, but also for continuous-time system by exploiting the delta domain version of the expressions.

  10. Channel-aware multi-user uplink transmission scheme for SIMO-OFDM systems

    Institute of Scientific and Technical Information of China (English)

    PAN ChengKang; CAI YueMing; XU YouYun

    2009-01-01

    The problem of medium access control (MAC) in wireless single-Input multiple-output-orthogonal frequency division multiplexing (SIMO-OFOM) systems is addressed.Traditional random access protocols have low overheads and inferior performance.Centralized methods have superior performance and high overheads.To achieve the tradeoff between overhead and performance,we propose a channelaware uplink transmission (CaUT) scheme for SIMO-OFDM systems.In CaUT,users transmit requestto-send (RTS) at some subcarriers whose channel gains are above a predetermined threshold.Using the channel state information provided by RTS,access point performs user selection with receive beamforming to decide which users can access and then broadcasts the selection results via clear-to-send (CTS) to users.We present a distributed power control scheme by using a simple fixed modulation mode.We optimize the modulation order and channel gain thresholds to maximize the separable packets subject to the bit-error-rate (BER) and temporal fairness requirements and the Individual average transmit power constraints.The performance of CaUT scheme is analyzed analytically and evaluated by simulations.Simulation results show that CaUT can achieve more significant throughput performance than traditional random access protocols.

  11. Multiple Input - Multiple Output (MIMO) SAR

    Data.gov (United States)

    National Aeronautics and Space Administration — This effort will research and implement advanced Multiple-Input Multiple-Output (MIMO) Synthetic Aperture Radar (SAR) techniques which have the potential to improve...

  12. Security and reliability analysis of diversity combining techniques in SIMO mixed RF/FSO with multiple users

    KAUST Repository

    Abd El-Malek, Ahmed H.; Salhab, Anas M.; Zummo, Salam A.; Alouini, Mohamed-Slim

    2016-01-01

    In this paper, we investigate the impact of different diversity combining techniques on the security and reliability analysis of a single-input-multiple-output (SIMO) mixed radio frequency (RF)/free space optical (FSO) relay network with opportunistic multiuser scheduling. In this model, the user of the best channel among multiple users communicates with a multiple antennas relay node over an RF link, and then, the relay node employs amplify-and-forward (AF) protocol in retransmitting the user data to the destination over an FSO link. Moreover, the authorized transmission is assumed to be attacked by a single passive RF eavesdropper equipped with multiple antennas. Therefore, the system security reliability trade-off analysis is investigated. Closed-form expressions for the system outage probability and the system intercept probability are derived. Then, the newly derived expressions are simplified to their asymptotic formulas at the high signal-to-noise- ratio (SNR) region. Numerical results are presented to validate the achieved exact and asymptotic results and to illustrate the impact of various system parameters on the system performance. © 2016 IEEE.

  13. Enhancing Physical Layer Security of Multiuser SIMO Mixed RF/FSO Relay Networks with Multi-Eavesdroppers

    KAUST Repository

    El-Malek, Ahmed H. Abd

    2017-02-09

    In this paper, we investigate the secrecy performance of multiuser (MU) single-input multiple-output (SIMO) mixed radio frequency (RF)/free space optical (FSO) relay network with opportunistic user scheduling and multiple eavesdropping attacks. The considered system includes multiple users, one amplify-and-froward (AF) relay, one destination and multiple eavesdroppers. The users are connected with a multi-antenna relay through RF links and the relay is connected with the destination through an FSO link. Maximal ratio combining (MRC) scheme is used at the relay node to combine the received signals at its different antennas. The RF/FSO channels are assumed to follow Nakagami-m/Gamma-Gamma fading models with considering the effect of pointing errors. In particular, we derive closed- form expressions for the exact and asymptotic outage probabilities. The asymptotic outage results are then used to obtain the optimal RF transmission power based on the dominant link between the RF and FSO links. Then, the considered system secrecy performance is investigated in the presence of multi- eavesdroppers where exact closed-form expression for the intercept probability is derived. Finally, a cooperative jamming model is proposed along with power allocation to enhance the system secrecy performance. Monte-Carlo simulations are provided to validate the achieved exact and asymptotic results.

  14. Security and reliability analysis of diversity combining techniques in SIMO mixed RF/FSO with multiple users

    KAUST Repository

    Abd El-Malek, Ahmed H.

    2016-07-26

    In this paper, we investigate the impact of different diversity combining techniques on the security and reliability analysis of a single-input-multiple-output (SIMO) mixed radio frequency (RF)/free space optical (FSO) relay network with opportunistic multiuser scheduling. In this model, the user of the best channel among multiple users communicates with a multiple antennas relay node over an RF link, and then, the relay node employs amplify-and-forward (AF) protocol in retransmitting the user data to the destination over an FSO link. Moreover, the authorized transmission is assumed to be attacked by a single passive RF eavesdropper equipped with multiple antennas. Therefore, the system security reliability trade-off analysis is investigated. Closed-form expressions for the system outage probability and the system intercept probability are derived. Then, the newly derived expressions are simplified to their asymptotic formulas at the high signal-to-noise- ratio (SNR) region. Numerical results are presented to validate the achieved exact and asymptotic results and to illustrate the impact of various system parameters on the system performance. © 2016 IEEE.

  15. Security-Reliability Trade-Off Analysis for Multiuser SIMO Mixed RF/FSO Relay Networks With Opportunistic User Scheduling

    KAUST Repository

    El-Malek, Ahmed H. Abd; Salhab, Anas M.; Zummo, Salam A.; Alouini, Mohamed-Slim

    2016-01-01

    In this paper, we study the performance of multiuser single-input multiple-output mixed radio frequency (RF)/free space optical (FSO) relay network with opportunistic user scheduling. The considered system includes multiple users, one amplify

  16. Quantum theory of multiple-input-multiple-output Markovian feedback with diffusive measurements

    International Nuclear Information System (INIS)

    Chia, A.; Wiseman, H. M.

    2011-01-01

    Feedback control engineers have been interested in multiple-input-multiple-output (MIMO) extensions of single-input-single-output (SISO) results of various kinds due to its rich mathematical structure and practical applications. An outstanding problem in quantum feedback control is the extension of the SISO theory of Markovian feedback by Wiseman and Milburn [Phys. Rev. Lett. 70, 548 (1993)] to multiple inputs and multiple outputs. Here we generalize the SISO homodyne-mediated feedback theory to allow for multiple inputs, multiple outputs, and arbitrary diffusive quantum measurements. We thus obtain a MIMO framework which resembles the SISO theory and whose additional mathematical structure is highlighted by the extensive use of vector-operator algebra.

  17. Computing multiple-output regression quantile regions

    Czech Academy of Sciences Publication Activity Database

    Paindaveine, D.; Šiman, Miroslav

    2012-01-01

    Roč. 56, č. 4 (2012), s. 840-853 ISSN 0167-9473 R&D Projects: GA MŠk(CZ) 1M06047 Institutional research plan: CEZ:AV0Z10750506 Keywords : halfspace depth * multiple-output regression * parametric linear programming * quantile regression Subject RIV: BA - General Mathematics Impact factor: 1.304, year: 2012 http://library.utia.cas.cz/separaty/2012/SI/siman-0376413.pdf

  18. Galois connection for multiple-output operations

    Czech Academy of Sciences Publication Activity Database

    Jeřábek, Emil

    2018-01-01

    Roč. 79 (2018), č. článku 17. ISSN 0002-5240 EU Projects: European Commission(XE) 339691 - FEALORA Institutional support: RVO:67985840 Keywords : clones and coclones * Galois connection * multiple-output operations Subject RIV: BA - General Mathematics OBOR OECD: Pure mathematics Impact factor: 0.625, year: 2016 https://link.springer.com/ article /10.1007%2Fs00012-018-0499-7

  19. Galois connection for multiple-output operations

    Czech Academy of Sciences Publication Activity Database

    Jeřábek, Emil

    2018-01-01

    Roč. 79, č. 2 (2018), č. článku 17. ISSN 0002-5240 EU Projects: European Commission(XE) 339691 - FEALORA Institutional support: RVO:67985840 Keywords : clones and coclones * Galois connection * multiple-output operations Subject RIV: BA - General Mathematics OBOR OECD: Pure mathematics Impact factor: 0.625, year: 2016 https://link.springer.com/article/10.1007%2Fs00012-018-0499-7

  20. On directional multiple-output quantile regression

    Czech Academy of Sciences Publication Activity Database

    Paindaveine, D.; Šiman, Miroslav

    2011-01-01

    Roč. 102, č. 2 (2011), s. 193-212 ISSN 0047-259X R&D Projects: GA MŠk(CZ) 1M06047 Grant - others:Commision EC(BE) Fonds National de la Recherche Scientifique Institutional research plan: CEZ:AV0Z10750506 Keywords : multivariate quantile * quantile regression * multiple-output regression * halfspace depth * portfolio optimization * value-at risk Subject RIV: BA - General Mathematics Impact factor: 0.879, year: 2011 http://library.utia.cas.cz/separaty/2011/SI/siman-0364128.pdf

  1. Multiple output timing and trigger generator

    Energy Technology Data Exchange (ETDEWEB)

    Wheat, Robert M. [Los Alamos National Laboratory; Dale, Gregory E [Los Alamos National Laboratory

    2009-01-01

    In support of the development of a multiple stage pulse modulator at the Los Alamos National Laboratory, we have developed a first generation, multiple output timing and trigger generator. Exploiting Commercial Off The Shelf (COTS) Micro Controller Units (MCU's), the timing and trigger generator provides 32 independent outputs with a timing resolution of about 500 ns. The timing and trigger generator system is comprised of two MCU boards and a single PC. One of the MCU boards performs the functions of the timing and signal generation (the timing controller) while the second MCU board accepts commands from the PC and provides the timing instructions to the timing controller. The PC provides the user interface for adjusting the on and off timing for each of the output signals. This system provides 32 output or timing signals which can be pre-programmed to be in an on or off state for each of 64 time steps. The width or duration of each of the 64 time steps is programmable from 2 {micro}s to 2.5 ms with a minimum time resolution of 500 ns. The repetition rate of the programmed pulse train is only limited by the time duration of the programmed event. This paper describes the design and function of the timing and trigger generator system and software including test results and measurements.

  2. A Monte Carlo Study on Multiple Output Stochastic Frontiers

    DEFF Research Database (Denmark)

    Henningsen, Géraldine; Henningsen, Arne; Jensen, Uwe

    , dividing all other output quantities by the selected output quantity, and using these ratios as regressors (OD). Another approach is the stochastic ray production frontier (SR) which transforms the output quantities into their Euclidean distance as the dependent variable and their polar coordinates......In the estimation of multiple output technologies in a primal approach, the main question is how to handle the multiple outputs. Often an output distance function is used, where the classical approach is to exploit its homogeneity property by selecting one output quantity as the dependent variable...... of both specifications for the case of a Translog output distance function with respect to different common statistical problems as well as problems arising as a consequence of zero values in the output quantities. Although, our results partly show clear reactions to statistical misspecifications...

  3. Elliptical multiple-output quantile regression and convex optimization

    Czech Academy of Sciences Publication Activity Database

    Hallin, M.; Šiman, Miroslav

    2016-01-01

    Roč. 109, č. 1 (2016), s. 232-237 ISSN 0167-7152 R&D Projects: GA ČR GA14-07234S Institutional support: RVO:67985556 Keywords : quantile regression * elliptical quantile * multivariate quantile * multiple-output regression Subject RIV: BA - General Mathematics Impact factor: 0.540, year: 2016 http://library.utia.cas.cz/separaty/2016/SI/siman-0458243.pdf

  4. Multiple-Input Multiple-Output OFDM with Index Modulation

    OpenAIRE

    Basar, Ertugrul

    2015-01-01

    Orthogonal frequency division multiplexing with index modulation (OFDM-IM) is a novel multicarrier transmission technique which has been proposed as an alternative to classical OFDM. The main idea of OFDM-IM is the use of the indices of the active subcarriers in an OFDM system as an additional source of information. In this work, we propose multiple-input multiple-output OFDM-IM (MIMO-OFDM-IM) scheme by combining OFDM-IM and MIMO transmission techniques. The low complexity transceiver structu...

  5. Programmable pulse sequence generator with multiple output lines

    Science.gov (United States)

    Drabczyk, Hubert

    2006-10-01

    This paper presents a novel concept of pulse sequence generator and its prototype as an electronic circuit testing laboratory tool. The generator has multiple output lines and is capable of using control data defining different pulse sequences to be given to the outputs. It is also possible to use different voltage levels in output signal and switch output lines for reading data from driven system. The pulse sequence generator can be used for runtime environment simulation, as hardware tester or auxiliary tool in new designs. Important design factors were to keep cost of the tool low and allow integration with other projects by using flexible architecture. The prototype was based on universal programmer with adjustable power supply, '51 microcontroller and Altera Cyclone chip. The generator communicates witch PC computer via RS232 port. Dedicated software was developed in the course of this project, to control the tool and data transmission. The prototype confirmed the possibility to create an inexpensive multipurpose laboratory tool for programming, testing and simulation of digital devices.

  6. Programmable Input Mode Instrumentation Amplifier Using Multiple Output Current Conveyors

    Directory of Open Access Journals (Sweden)

    Pankiewicz Bogdan

    2017-03-01

    Full Text Available In this paper a programmable input mode instrumentation amplifier (IA utilising second generation, multiple output current conveyors and transmission gates is presented. Its main advantage is the ability to choose a voltage or current mode of inputs by setting the voltage of two configuration nodes. The presented IA is prepared as an integrated circuit block to be used alone or as a sub-block in a microcontroller or in a field programmable gate array (FPGA, which shall condition analogue signals to be next converted by an analogue-to-digital converter (ADC. IA is designed in AMS 0.35 µm CMOS technology and the power supply is 3.3 V; the power consumption is approximately 9.1 mW. A linear input range in the voltage mode reaches ± 1.68 V or ± 250 µA in current mode. A passband of the IA is above 11 MHz. The amplifier works in class A, so its current supply is almost constant and does not cause noise disturbing nearby working precision analogue circuits.

  7. Secrecy performance analysis of SIMO underlay cognitive radio systems with outdated CSI

    KAUST Repository

    Lei, Hongjiang; Zhang, Jianming; Park, Kihong; Ansari, Imran Shafique; Pan, Gaofeng; Alouini, Mohamed-Slim

    2017-01-01

    This study investigates the secrecy outage performance of a single-input multiple-output underlay cognitive radio network (CRN) with outdated channel state information (CSI). The confidential messages are transmitted from transmitter to the destination, while a multi-antenna eavesdropper exists. The maximal ratio combining and selection combining schemes are utilised at the receivers to improve the quality of the received signal-to-noise ratio. The exact and asymptotic closed-form expressions of secrecy outage probability are derived, and simulation results are provided to verify the authors' proposed analytical results. The results reveal that imperfect CSI of main channels deteriorates the secrecy outage performance while that of eavesdropping and interfering channels has contrary effect, and only a unity diversity order can be obtained in underlay CRNs with imperfect CSI.

  8. Secrecy performance analysis of SIMO underlay cognitive radio systems with outdated CSI

    KAUST Repository

    Lei, Hongjiang

    2017-06-13

    This study investigates the secrecy outage performance of a single-input multiple-output underlay cognitive radio network (CRN) with outdated channel state information (CSI). The confidential messages are transmitted from transmitter to the destination, while a multi-antenna eavesdropper exists. The maximal ratio combining and selection combining schemes are utilised at the receivers to improve the quality of the received signal-to-noise ratio. The exact and asymptotic closed-form expressions of secrecy outage probability are derived, and simulation results are provided to verify the authors\\' proposed analytical results. The results reveal that imperfect CSI of main channels deteriorates the secrecy outage performance while that of eavesdropping and interfering channels has contrary effect, and only a unity diversity order can be obtained in underlay CRNs with imperfect CSI.

  9. A Monte Carlo Study on Multiple Output Stochastic Frontiers: Comparison of Two Approaches

    DEFF Research Database (Denmark)

    Henningsen, Geraldine; Henningsen, Arne; Jensen, Uwe

    , dividing all other output quantities by the selected output quantity, and using these ratios as regressors (OD). Another approach is the stochastic ray production frontier (SR) which transforms the output quantities into their Euclidean distance as the dependent variable and their polar coordinates......In the estimation of multiple output technologies in a primal approach, the main question is how to handle the multiple outputs. Often an output distance function is used, where the classical approach is to exploit its homogeneity property by selecting one output quantity as the dependent variable...... of both specifications for the case of a Translog output distance function with respect to different common statistical problems as well as problems arising as a consequence of zero values in the output quantities. Although, our results partly show clear reactions to statistical misspecifications...

  10. Self-Structured Organizing Single-Input CMAC Control for Robot Manipulator

    Directory of Open Access Journals (Sweden)

    ThanhQuyen Ngo

    2011-09-01

    Full Text Available This paper represents a self-structured organizing single-input control system based on differentiable cerebellar model articulation controller (CMAC for an n-link robot manipulator to achieve the high-precision position tracking. In the proposed scheme, the single-input CMAC controller is solely used to control the plant, so the input space dimension of CMAC can be simplified and no conventional controller is needed. The structure of single-input CMAC will also be self-organized; that is, the layers of single-input CMAC will grow or prune systematically and their receptive functions can be automatically adjusted. The online tuning laws of single-input CMAC parameters are derived in gradient-descent learning method and the discrete-type Lyapunov function is applied to determine the learning rates of proposed control system so that the stability of the system can be guaranteed. The simulation results of robot manipulator are provided to verify the effectiveness of the proposed control methodology.

  11. Experimental demonstration of multiple-inputs multiple-outputs OFDM/OQAM visible light communications

    Science.gov (United States)

    Lin, Bangjiang; Tang, Xuan; Ghassemlooy, Zabih; Lin, Chun; Zhang, Min

    2017-10-01

    We experimentally demonstrate a 2×2 optical multiple-inputs multiple-outputs (MIMO) visible light communications system based on the modified orthogonal frequency-division multiplexing/offset quadrature amplitude modulation scheme. The adjacent subcarrier frequency-domain averaging (ASFA) with the full-loaded (FL) and half-loaded (HL) preamble structures is proposed for demultiplexing and mitigating the intrinsic imaginary interference (IMI) effect. Compared with the conventional channel estimation (CE) method, ASFA offers improved transmission performance. With the FL method, we obtain more accurate MIMO CE to mitigate the IMI effect and the optical noise compared to the HL method.

  12. Experimentation of Eigenvector Dynamics in a Multiple Input Multiple Output Channel in the 5GHz Band

    DEFF Research Database (Denmark)

    Brown, Tim; Eggers, Patrick Claus F.; Katz, Marcos

    2005-01-01

    Much research has been carried out on the production of both physical and non physical Multiple Input Multiple Output channel models with regard to increased channel capacity as well as analysis of eigenvalues through the use of singular value decomposition. Little attention has been paid...... to the analysis of vector dynamics in terms of how the state of eigenvectors will change as a mobile is moving through a changing physical environment. This is important in terms of being able to track the orthogonal eigenmodes at system level, while also relieving the burden of tracking of the full channel...

  13. General Dimensional Multiple-Output Support Vector Regressions and Their Multiple Kernel Learning.

    Science.gov (United States)

    Chung, Wooyong; Kim, Jisu; Lee, Heejin; Kim, Euntai

    2015-11-01

    Support vector regression has been considered as one of the most important regression or function approximation methodologies in a variety of fields. In this paper, two new general dimensional multiple output support vector regressions (MSVRs) named SOCPL1 and SOCPL2 are proposed. The proposed methods are formulated in the dual space and their relationship with the previous works is clearly investigated. Further, the proposed MSVRs are extended into the multiple kernel learning and their training is implemented by the off-the-shelf convex optimization tools. The proposed MSVRs are applied to benchmark problems and their performances are compared with those of the previous methods in the experimental section.

  14. Monterey Bay National Marine Sanctuary: Sanctuary Integrated Monitoring Network (SIMoN)

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — The Sanctuary Integrated Monitoring Network (SIMoN) is an integrated, long-term program that takes an ecosystem approach to identify and understand changes to the...

  15. Novel applications of multitask learning and multiple output regression to multiple genetic trait prediction.

    Science.gov (United States)

    He, Dan; Kuhn, David; Parida, Laxmi

    2016-06-15

    Given a set of biallelic molecular markers, such as SNPs, with genotype values encoded numerically on a collection of plant, animal or human samples, the goal of genetic trait prediction is to predict the quantitative trait values by simultaneously modeling all marker effects. Genetic trait prediction is usually represented as linear regression models. In many cases, for the same set of samples and markers, multiple traits are observed. Some of these traits might be correlated with each other. Therefore, modeling all the multiple traits together may improve the prediction accuracy. In this work, we view the multitrait prediction problem from a machine learning angle: as either a multitask learning problem or a multiple output regression problem, depending on whether different traits share the same genotype matrix or not. We then adapted multitask learning algorithms and multiple output regression algorithms to solve the multitrait prediction problem. We proposed a few strategies to improve the least square error of the prediction from these algorithms. Our experiments show that modeling multiple traits together could improve the prediction accuracy for correlated traits. The programs we used are either public or directly from the referred authors, such as MALSAR (http://www.public.asu.edu/~jye02/Software/MALSAR/) package. The Avocado data set has not been published yet and is available upon request. dhe@us.ibm.com. © The Author 2016. Published by Oxford University Press.

  16. Deep convolutional neural network based antenna selection in multiple-input multiple-output system

    Science.gov (United States)

    Cai, Jiaxin; Li, Yan; Hu, Ying

    2018-03-01

    Antenna selection of wireless communication system has attracted increasing attention due to the challenge of keeping a balance between communication performance and computational complexity in large-scale Multiple-Input MultipleOutput antenna systems. Recently, deep learning based methods have achieved promising performance for large-scale data processing and analysis in many application fields. This paper is the first attempt to introduce the deep learning technique into the field of Multiple-Input Multiple-Output antenna selection in wireless communications. First, the label of attenuation coefficients channel matrix is generated by minimizing the key performance indicator of training antenna systems. Then, a deep convolutional neural network that explicitly exploits the massive latent cues of attenuation coefficients is learned on the training antenna systems. Finally, we use the adopted deep convolutional neural network to classify the channel matrix labels of test antennas and select the optimal antenna subset. Simulation experimental results demonstrate that our method can achieve better performance than the state-of-the-art baselines for data-driven based wireless antenna selection.

  17. Measurement and Analysis of Multiple Output Transient Propagation in BJT Analog Circuits

    Science.gov (United States)

    Roche, Nicolas J.-H.; Khachatrian, A.; Warner, J. H.; Buchner, S. P.; McMorrow, D.; Clymer, D. A.

    2016-08-01

    The propagation of Analog Single Event Transients (ASETs) to multiple outputs of Bipolar Junction Transistor (BJTs) Integrated Circuits (ICs) is reported for the first time. The results demonstrate that ASETs can appear at several outputs of a BJT amplifier or comparator as a result of a single ion or single laser pulse strike at a single physical location on the chip of a large-scale integrated BJT analog circuit. This is independent of interconnect cross-talk or charge-sharing effects. Laser experiments, together with SPICE simulations and analysis of the ASET's propagation in the s-domain are used to explain how multiple-output transients (MOTs) are generated and propagate in the device. This study demonstrates that both the charge collection associated with an ASET and the ASET's shape, commonly used to characterize the propagation of SETs in devices and systems, are unable to explain quantitatively how MOTs propagate through an integrated analog circuit. The analysis methodology adopted here involves combining the Fourier transform of the propagating signal and the current-source transfer function in the s-domain. This approach reveals the mechanisms involved in the transient signal propagation from its point of generation to one or more outputs without the signal following a continuous interconnect path.

  18. Security-Reliability Trade-Off Analysis for Multiuser SIMO Mixed RF/FSO Relay Networks With Opportunistic User Scheduling

    KAUST Repository

    El-Malek, Ahmed H. Abd

    2016-05-24

    In this paper, we study the performance of multiuser single-input multiple-output mixed radio frequency (RF)/free space optical (FSO) relay network with opportunistic user scheduling. The considered system includes multiple users, one amplify-and-forward relay, one destination, and a multiple-antenna eavesdropper. The users are connected with the relay node through RF links and the relay is connected with the destination through an FSO link. Both maximum ratio combining and selection combining schemes are used at the multiple-antenna relay to combine the signal received from the best user on different antennas. The RF/FSO channels models are assumed to follow Nakagami-m/gamma-gamma fading models with pointing errors. Closed-form expressions are derived for the outage probability, average symbol error probability, and ergodic channel capacity. Then, the power of the selected best user is determined to minimize the system asymptotic outage probability under the dominant RF or FSO link. Then, the considered system secrecy performance is investigated, where the closed-form expressions for the intercept probability are derived. Finally, we propose a new cooperative jamming model in which the worst user is selected by the authorized system to jam the existing eavesdropper. Monte-Carlo simulations are provided to validate the achieved exact and asymptotic results.

  19. Multiple-input multiple-output visible light communication system based on disorder dispersion components

    Science.gov (United States)

    Yang, Tao; Zhang, Qi; Hao, Yue; Zhou, Xin-hui; Yi, Ming-dong; Wei, Wei; Huang, Wei; Li, Xing-ao

    2017-10-01

    A multiple-input multiple-output visible light communication (VLC) system based on disorder dispersion components is presented. Instead of monochromatic sources and large size photodetectors used in the traditional VLC systems, broadband sources with different spectra act as the transmitters and a compact imaging chip sensor accompanied by a disorder dispersion component and a calculating component serve as the receivers in the proposed system. This system has the merits of small size, more channels, simple structure, easy integration, and low cost. Simultaneously, the broadband sources are suitable to act as illumination sources for their white color. A regularized procedure is designed to solve a matrix equation for decoding the signals at the receivers. A proof-of-concept experiment using on-off keying modulation has been done to prove the feasibility of the design. The experimental results show that the signals decoded by the receivers fit well with those generated from the transmitters, but the bit error ratio is increased with the number of the signal channels. The experimental results can be further improved using a high-speed charge-coupled device, decreasing noises, and increasing the distance between the transmitters and the receivers.

  20. Performance analysis of commercial multiple-input-multiple-output access point in distributed antenna system.

    Science.gov (United States)

    Fan, Yuting; Aighobahi, Anthony E; Gomes, Nathan J; Xu, Kun; Li, Jianqiang

    2015-03-23

    In this paper, we experimentally investigate the throughput of IEEE 802.11n 2x2 multiple-input-multiple-output (MIMO) signals in a radio-over-fiber-based distributed antenna system (DAS) with different fiber lengths and power imbalance. Both a MIMO-supported access point (AP) and a spatial-diversity-supported AP were separately employed in the experiments. Throughput measurements were carried out with wireless users at different locations in a typical office environment. For the different fiber length effect, the results indicate that MIMO signals can maintain high throughput when the fiber length difference between the two remote antenna units (RAUs) is under 100 m and falls quickly when the length difference is greater. For the spatial diversity signals, high throughput can be maintained even when the difference is 150 m. On the other hand, the separation of the MIMO antennas allows additional freedom in placing the antennas in strategic locations for overall improved system performance, although it may also lead to received power imbalance problems. The results show that the throughput performance drops in specific positions when the received power imbalance is above around 13 dB. Hence, there is a trade-off between the extent of the wireless coverage for moderate bit-rates and the area over which peak bit-rates can be achieved.

  1. Cantada al Santísimo con violines. Llegue la suerte mía

    OpenAIRE

    Morales

    2010-01-01

    Tabla de contenido: 1. Violín primero; 2. Violín segundo; 3. Acompañamiento; 4. Recitado y aria.Folio 2. Acompañamiento.Folio 3. Violín primero.Folio 4. Violín segundo.Folio 5. Cantada al Santísimo.Folio 5-7. Letra.

  2. Control of cancer growth using single input autonomous fuzzy Nano-particles

    Directory of Open Access Journals (Sweden)

    Fahimeh Razmi

    2015-04-01

    Full Text Available In this paper a single input fuzzy controller is applied on autonomous drug-encapsulated nanoparticles (ADENPs to restrict the cancer growth. The proposed ADENPs, swarmly release the drug in local cancerous tissue and effectively decreases the destruction of normal tissue. The amount of released drug is defined considering to feed backed values of tumor growth rate and the used drug. Some significant characteristics of Nano particles compared to Nano-robots is their ability to recognize the cancerous tissue from the normal one and their simple structure. Nano particles became an attractive topic in Nano science and many efforts have been done to manufacture these particles. Simulation results show that the proposed controlling method not only decreases the cancerous tissue effectively but also reduces the side effects of drug impressively.

  3. A new adaptive blind channel identification algorithm

    International Nuclear Information System (INIS)

    Peng Dezhong; Xiang Yong; Yi Zhang

    2009-01-01

    This paper addresses the blind identification of single-input multiple-output (SIMO) finite-impulse-response (FIR) systems. We first propose a new adaptive algorithm for the blind identification of SIMO FIR systems. Then, its convergence property is analyzed systematically. It is shown that under some mild conditions, the proposed algorithm is guaranteed to converge in the mean to the true channel impulse responses in both noisy and noiseless cases. Simulations are carried out to demonstrate the theoretical results.

  4. Application of data-processing to the technical and economical management of the plants of Simo

    International Nuclear Information System (INIS)

    Chastagner, F.

    1988-01-01

    The firm Simo is entrusted with the processing of the uranium ores extracted from the mines of Cogema in France, in its three plants. The paper describes the conception and the functioning of the information system. Among the advantages contributed by the system, the coherence between the technical follow-up and the economical follow-up constitutes one of the principal progressive features [fr

  5. A Direct Algorithm for Pole Placement by State-derivative Feedback for Single-input Linear Systems

    Directory of Open Access Journals (Sweden)

    Taha H. S. Abdelaziz

    2003-01-01

    Full Text Available This paper deals with the direct solution of the pole placement problem for single-input linear systems using state-derivative feedback. This pole placement problem is always solvable for any controllable systems if all eigenvalues of the original system are nonzero. Then any arbitrary closed-loop poles can be placed in order to achieve the desired system performance. The solving procedure results in a formula similar to the Ackermann formula. Its derivation is based on the transformation of a linear single-input system into Frobenius canonical form by a special coordinate transformation, then solving the pole placement problem by state derivative feedback. Finally the solution is extended also for single-input time-varying control systems. The simulation results are included to show the effectiveness of the proposed approach.

  6. Multiple-output support vector machine regression with feature selection for arousal/valence space emotion assessment.

    Science.gov (United States)

    Torres-Valencia, Cristian A; Álvarez, Mauricio A; Orozco-Gutiérrez, Alvaro A

    2014-01-01

    Human emotion recognition (HER) allows the assessment of an affective state of a subject. Until recently, such emotional states were described in terms of discrete emotions, like happiness or contempt. In order to cover a high range of emotions, researchers in the field have introduced different dimensional spaces for emotion description that allow the characterization of affective states in terms of several variables or dimensions that measure distinct aspects of the emotion. One of the most common of such dimensional spaces is the bidimensional Arousal/Valence space. To the best of our knowledge, all HER systems so far have modelled independently, the dimensions in these dimensional spaces. In this paper, we study the effect of modelling the output dimensions simultaneously and show experimentally the advantages in modeling them in this way. We consider a multimodal approach by including features from the Electroencephalogram and a few physiological signals. For modelling the multiple outputs, we employ a multiple output regressor based on support vector machines. We also include an stage of feature selection that is developed within an embedded approach known as Recursive Feature Elimination (RFE), proposed initially for SVM. The results show that several features can be eliminated using the multiple output support vector regressor with RFE without affecting the performance of the regressor. From the analysis of the features selected in smaller subsets via RFE, it can be observed that the signals that are more informative into the arousal and valence space discrimination are the EEG, Electrooculogram/Electromiogram (EOG/EMG) and the Galvanic Skin Response (GSR).

  7. Analytical approach for modeling and performance analysis of microring resonators as optical filters with multiple output bus waveguides

    Science.gov (United States)

    Lakra, Suchita; Mandal, Sanjoy

    2017-06-01

    A quadruple micro-optical ring resonator (QMORR) with multiple output bus waveguides is mathematically modeled and analyzed by making use of the delay-line signal processing approach in Z-domain and Mason's gain formula. The performances of QMORR with two output bus waveguides with vertical coupling are analyzed. This proposed structure is capable of providing wider free spectral response from both the output buses with appreciable cross talk. Thus, this configuration could provide increased capacity to insert a large number of communication channels. The simulated frequency response characteristic and its dispersion and group delay characteristics are graphically presented using the MATLAB environment.

  8. Improving SC-FDMA performance by Turbo Equalization in UTRA LTE Uplink

    DEFF Research Database (Denmark)

    Berardinelli, Gilberto; Priyanto, Basuki Endah; Sørensen, Troels Bundgaard

    2008-01-01

    of UTRA Long Term Evolution (LTE) Uplink. The performance is evaluated for 1x2 Single Input Multiple Output (SIMO) antenna configuration in a 6 paths Typical Urban (TU-06) channel profile. For assessment purpose, the results are compared with SC-FDMA MMSE and OFDMA schemes. Simulation results show...

  9. Minimum redundancy MIMO radars

    OpenAIRE

    Chen, Chun-Yang; Vaidyanathan, P. P.

    2008-01-01

    The multiple-input multiple-output (MIMO) radar concept has drawn considerable attention recently. In the traditional single-input multiple-output (SIMO) radar system, the transmitter emits scaled versions of a single waveform. However, in the MIMO radar system, the transmitter transmits independent waveforms. It has been shown that the MIMO radar can be used to improve system performance. Most of the MIMO radar research so far has focused on the uniform array. However, i...

  10. Los espacios en Edipo en Colono. El segundo estásimo

    Directory of Open Access Journals (Sweden)

    María Inés Saraiva de Grossi

    2005-12-01

    Full Text Available O presente trabalho consiste numa classificação dos espaços em Édipo em Colono, fundamentalmente no estásimo II, que se constrói como o epicentro dramático, porque acolhe em si mesmo todas as categorias espaciais formuladas, o que lhe confere um relevo semiótico particular. O rapto das filhas de Édipo, cantado pelos anciãos, constitui um ponto de inflexão que separa a obra em duas partes.

  11. ESPRIT-like algorithm for computational-efficient angle estimation in bistatic multiple-input multiple-output radar

    Science.gov (United States)

    Gong, Jian; Lou, Shuntian; Guo, Yiduo

    2016-04-01

    An estimation of signal parameters via a rotational invariance techniques-like (ESPRIT-like) algorithm is proposed to estimate the direction of arrival and direction of departure for bistatic multiple-input multiple-output (MIMO) radar. The properties of a noncircular signal and Euler's formula are first exploited to establish a real-valued bistatic MIMO radar array data, which is composed of sine and cosine data. Then the receiving/transmitting selective matrices are constructed to obtain the receiving/transmitting rotational invariance factors. Since the rotational invariance factor is a cosine function, symmetrical mirror angle ambiguity may occur. Finally, a maximum likelihood function is used to avoid the estimation ambiguities. Compared with the existing ESPRIT, the proposed algorithm can save about 75% of computational load owing to the real-valued ESPRIT algorithm. Simulation results confirm the effectiveness of the ESPRIT-like algorithm.

  12. Double-Layer Low-Density Parity-Check Codes over Multiple-Input Multiple-Output Channels

    Directory of Open Access Journals (Sweden)

    Yun Mao

    2012-01-01

    Full Text Available We introduce a double-layer code based on the combination of a low-density parity-check (LDPC code with the multiple-input multiple-output (MIMO system, where the decoding can be done in both inner-iteration and outer-iteration manners. The present code, called low-density MIMO code (LDMC, has a double-layer structure, that is, one layer defines subcodes that are embedded in each transmission vector and another glues these subcodes together. It supports inner iterations inside the LDPC decoder and outeriterations between detectors and decoders, simultaneously. It can also achieve the desired design rates due to the full rank of the deployed parity-check matrix. Simulations show that the LDMC performs favorably over the MIMO systems.

  13. On the average complexity of sphere decoding in lattice space-time coded multiple-input multiple-output channel

    KAUST Repository

    Abediseid, Walid

    2012-12-21

    The exact average complexity analysis of the basic sphere decoder for general space-time codes applied to multiple-input multiple-output (MIMO) wireless channel is known to be difficult. In this work, we shed the light on the computational complexity of sphere decoding for the quasi- static, lattice space-time (LAST) coded MIMO channel. Specifically, we drive an upper bound of the tail distribution of the decoder\\'s computational complexity. We show that when the computational complexity exceeds a certain limit, this upper bound becomes dominated by the outage probability achieved by LAST coding and sphere decoding schemes. We then calculate the minimum average computational complexity that is required by the decoder to achieve near optimal performance in terms of the system parameters. Our results indicate that there exists a cut-off rate (multiplexing gain) for which the average complexity remains bounded. Copyright © 2012 John Wiley & Sons, Ltd.

  14. Integrated reconfigurable multiple-input–multiple-output antenna system with an ultra-wideband sensing antenna for cognitive radio platforms

    KAUST Repository

    Hussain, Rifaqat

    2015-06-18

    © The Institution of Engineering and Technology 2015. A compact, novel multi-mode, multi-band frequency reconfigurable multiple-input-multiple-output (MIMO) antenna system, integrated with ultra-wideband (UWB) sensing antenna, is presented. The developed model can be used as a complete antenna platform for cognitive radio applications. The antenna system is developed on a single substrate area of dimensions 65 × 120 mm2. The proposed sensing antenna is used to cover a wide range of frequency bands from 710 to 3600 MHz. The frequency reconfigurable dual-element MIMO antenna is integrated with P-type, intrinsic, N-type (PIN) diodes for frequency agility. Different modes of selection are used for the MIMO antenna system reconfigurability to support different wireless system standards. The proposed MIMO antenna configuration is used to cover various frequency bands from 755 to 3450 MHz. The complete system comprising the multi-band reconfigurable MIMO antennas and UWB sensing antenna for cognitive radio applications is proposed with a compact form factor.

  15. Adaptive multi-node multiple input and multiple output (MIMO) transmission for mobile wireless multimedia sensor networks.

    Science.gov (United States)

    Cho, Sunghyun; Choi, Ji-Woong; You, Cheolwoo

    2013-10-02

    Mobile wireless multimedia sensor networks (WMSNs), which consist of mobile sink or sensor nodes and use rich sensing information, require much faster and more reliable wireless links than static wireless sensor networks (WSNs). This paper proposes an adaptive multi-node (MN) multiple input and multiple output (MIMO) transmission to improve the transmission reliability and capacity of mobile sink nodes when they experience spatial correlation. Unlike conventional single-node (SN) MIMO transmission, the proposed scheme considers the use of transmission antennas from more than two sensor nodes. To find an optimal antenna set and a MIMO transmission scheme, a MN MIMO channel model is introduced first, followed by derivation of closed-form ergodic capacity expressions with different MIMO transmission schemes, such as space-time transmit diversity coding and spatial multiplexing. The capacity varies according to the antenna correlation and the path gain from multiple sensor nodes. Based on these statistical results, we propose an adaptive MIMO mode and antenna set switching algorithm that maximizes the ergodic capacity of mobile sink nodes. The ergodic capacity of the proposed scheme is compared with conventional SN MIMO schemes, where the gain increases as the antenna correlation and path gain ratio increase.

  16. Hybrid digital-analog video transmission in wireless multicast and multiple-input multiple-output system

    Science.gov (United States)

    Liu, Yu; Lin, Xiaocheng; Fan, Nianfei; Zhang, Lin

    2016-01-01

    Wireless video multicast has become one of the key technologies in wireless applications. But the main challenge of conventional wireless video multicast, i.e., the cliff effect, remains unsolved. To overcome the cliff effect, a hybrid digital-analog (HDA) video transmission framework based on SoftCast, which transmits the digital bitstream with the quantization residuals, is proposed. With an effective power allocation algorithm and appropriate parameter settings, the residual gains can be maximized; meanwhile, the digital bitstream can assure transmission of a basic video to the multicast receiver group. In the multiple-input multiple-output (MIMO) system, since nonuniform noise interference on different antennas can be regarded as the cliff effect problem, ParCast, which is a variation of SoftCast, is also applied to video transmission to solve it. The HDA scheme with corresponding power allocation algorithms is also applied to improve video performance. Simulations show that the proposed HDA scheme can overcome the cliff effect completely with the transmission of residuals. What is more, it outperforms the compared WSVC scheme by more than 2 dB when transmitting under the same bandwidth, and it can further improve performance by nearly 8 dB in MIMO when compared with the ParCast scheme.

  17. SISTEM KONTROL OTOMATIK DENGAN MODEL SINGLE-INPUT-DUAL-OUTPUT DALAM KENDALI EFISIENSI UMUR-PEMAKAIAN INSTRUMEN

    Directory of Open Access Journals (Sweden)

    S.N.M.P. Simamora

    2014-10-01

    Full Text Available Efficiency condition occurs when the value of the used outputs compared to the resource total that has been used almost close to the value 1 (absolute environment. An instrument to achieve efficiency if the power output level has decreased significantly in the life of the instrument used, if it compared to the previous condition, when the instrument is not equipped with additional systems (or proposed model improvement. Even more effective if the inputs model that are used in unison to achieve a homogeneous output. On this research has been designed and implemented the automatic control system for models of single input-dual-output, wherein the sampling instruments used are lamp and fan. Source voltage used is AC (alternate-current and tested using quantitative research methods and instrumentation (with measuring instruments are observed. The results obtained demonstrate the efficiency of the instrument experienced a significant current model of single-input-dual-output applied separately instrument trials such as lamp and fan when it compared to the condition or state before. And the result show that the design has been built, can also run well.

  18. Towards a Multiple Input-Multiple Output paper mill: Opportunities for alternative raw materials and sidestream valorisation in the paper and board industry

    NARCIS (Netherlands)

    Bousios, Spyridon; Worrell, Ernst

    2017-01-01

    The paper and board industry (PBI) faces a series of challenges, ranging from shifts in the availability and quality of raw materials to the generation of large amounts of sidestreams whose disposal entails significant costs. The concept of the “Multiple Input-Multiple Output (MIMO) Paper Mill” is

  19. Dicósimo, Daniel y Simonassi, Silvia (comp., Trabajadores y empresarios en la Argentina del siglo XX: indagaciones desde la historia social

    Directory of Open Access Journals (Sweden)

    Valeria Ianni

    2013-01-01

    Full Text Available Dicósimo, Daniel y Simonassi, Silvia (comp., Trabajadores y empresarios en la Argentina del siglo XX: indagaciones desde la historia social, Prohistoria ediciones, Rosario, 2011 (194 págs..

  20. El hiperversículo en la generación de los novísimos

    Directory of Open Access Journals (Sweden)

    Miguel Ángel Márquez Guerrero

    2017-06-01

    Full Text Available Este artículo estudia una unidad métrica mayor que el versículo del verso libre, a la que denomino “hiperversículo”. El verso libre innova la silva modernista introduciendo el versículo, verso compuesto de miembros que comparten el ritmo endecasilábico de los versos simples. La prosificación de los poemas en la última etapa de Juan Ramón Jiménez quedó como un desarrollo extremo y marginal. Sin embargo, el hiperversículo de los novísimos aparece en los sesenta como un puente entre el verso libre inicial y sus formas ‘prosificadas’. Por otra parte, el hiperversículo es un rasgo de la poética de los novísimos que los vincula a las vanguardias.

  1. SIMO optical wireless links with nonzero boresight pointing errors over M modeled turbulence channels

    Science.gov (United States)

    Varotsos, G. K.; Nistazakis, H. E.; Petkovic, M. I.; Djordjevic, G. T.; Tombras, G. S.

    2017-11-01

    Over the last years terrestrial free-space optical (FSO) communication systems have demonstrated an increasing scientific and commercial interest in response to the growing demands for ultra high bandwidth, cost-effective and secure wireless data transmissions. However, due the signal propagation through the atmosphere, the performance of such links depends strongly on the atmospheric conditions such as weather phenomena and turbulence effect. Additionally, their operation is affected significantly by the pointing errors effect which is caused by the misalignment of the optical beam between the transmitter and the receiver. In order to address this significant performance degradation, several statistical models have been proposed, while particular attention has been also given to diversity methods. Here, the turbulence-induced fading of the received optical signal irradiance is studied through the M (alaga) distribution, which is an accurate model suitable for weak to strong turbulence conditions and unifies most of the well-known, previously emerged models. Thus, taking into account the atmospheric turbulence conditions along with the pointing errors effect with nonzero boresight and the modulation technique that is used, we derive mathematical expressions for the estimation of the average bit error rate performance for SIMO FSO links. Finally, proper numerical results are given to verify our derived expressions and Monte Carlo simulations are also provided to further validate the accuracy of the analysis proposed and the obtained mathematical expressions.

  2. Two-axis control of a coupled quantum dot - donor qubit in Si-MOS

    Science.gov (United States)

    Rudolph, Martin; Harvey-Collard, Patrick; Jacobson, Tobias; Wendt, Joel; Pluym, Tammy; Dominguez, Jason; Ten-Eyck, Greg; Lilly, Mike; Carroll, Malcolm

    Si-MOS based QD qubits are attractive due to their similarity to the current semiconductor industry. We introduce a highly tunable MOS foundry compatible qubit design that couples an electrostatic quantum dot (QD) with an implanted donor. We show for the first time coherent two-axis control of a two-electron spin logical qubit that evolves under the QD-donor exchange interaction and the hyperfine interaction with the donor nucleus. The two interactions are tuned electrically with surface gate voltages to provide control of both qubit axes. Qubit decoherence is influenced by charge noise, which is of similar strength as epitaxial systems like GaAs and Si/SiGe. This work was performed, in part, at the Center for Integrated Nanotechnologies, a U.S. DOE, Office of Basic Energy Sciences user facility. The work was supported by the Sandia National Laboratories Directed Research and Development Program. Sandia National Laboratories is a multi-program laboratory operated by Sandia Corporation, a Lockheed-Martin Company, for the U. S. Department of Energy under Contract No. DE-AC04-94AL85000.

  3. Ergodic channel capacity of spatial correlated multiple-input multiple-output free space optical links using multipulse pulse-position modulation

    Science.gov (United States)

    Wang, Huiqin; Wang, Xue; Cao, Minghua

    2017-02-01

    The spatial correlation extensively exists in the multiple-input multiple-output (MIMO) free space optical (FSO) communication systems due to the channel fading and the antenna space limitation. Wilkinson's method was utilized to investigate the impact of spatial correlation on the MIMO FSO communication system employing multipulse pulse-position modulation. Simulation results show that the existence of spatial correlation reduces the ergodic channel capacity, and the reception diversity is more competent to resist this kind of performance degradation.

  4. Robust fault detection and isolation technique for single-input/single-output closed-loop control systems that exhibit actuator and sensor faults

    DEFF Research Database (Denmark)

    Izadi-Zamanabadi, Roozbeh; Alavi, S. M. Mahdi; Hayes, M. J.

    2008-01-01

    An integrated quantitative feedback design and frequency-based fault detection and isolation (FDI) approach is presented for single-input/single-output systems. A novel design methodology, based on shaping the system frequency response, is proposed to generate an appropriate residual signal...

  5. Solid-phase reduction of silico-12-molybdic acid H4SiMo12O40 by some organic oxygen containing compounds

    International Nuclear Information System (INIS)

    Chuvaev, V.F.; Pinchuk, I.N.; Spitsyn, V.I.

    1982-01-01

    A study is made on reduction reactions of anhydrous silico-12-molybdic acid by vapors of organic oxygen-containing compounds at 170 deg C: alcohols, simple carbonyl compounds. Methods of thermal analysis, electron paramagnetic resonance, paramagnetic resonance were used to established that depending on the nature of organic reagent and temperature, H 6 SiMo 2 5 Mo 10 6 O 40 two-electron or H 8 SiMo 4 5 Mo 8 6 O 40 four-electron flues form. It is shown that the increase of heterogeneous reduction temperature can lead to formation of anhydrous phases of SiMo 12 O 38 -(n/2), able to attach water reversibly with formation of corresponding blue. Characteristics of blues, prepared during solid-phase reduction of silico-12-molybdic acid and mixed valent forms with corresponding reduction degree, separated from water solutions, were compared

  6. Multi-Target Angle Tracking Algorithm for Bistatic Multiple-Input Multiple-Output (MIMO Radar Based on the Elements of the Covariance Matrix

    Directory of Open Access Journals (Sweden)

    Zhengyan Zhang

    2018-03-01

    Full Text Available In this paper, we consider the problem of tracking the direction of arrivals (DOA and the direction of departure (DOD of multiple targets for bistatic multiple-input multiple-output (MIMO radar. A high-precision tracking algorithm for target angle is proposed. First, the linear relationship between the covariance matrix difference and the angle difference of the adjacent moment was obtained through three approximate relations. Then, the proposed algorithm obtained the relationship between the elements in the covariance matrix difference. On this basis, the performance of the algorithm was improved by averaging the covariance matrix element. Finally, the least square method was used to estimate the DOD and DOA. The algorithm realized the automatic correlation of the angle and provided better performance when compared with the adaptive asymmetric joint diagonalization (AAJD algorithm. The simulation results demonstrated the effectiveness of the proposed algorithm. The algorithm provides the technical support for the practical application of MIMO radar.

  7. Multi-Target Angle Tracking Algorithm for Bistatic Multiple-Input Multiple-Output (MIMO) Radar Based on the Elements of the Covariance Matrix.

    Science.gov (United States)

    Zhang, Zhengyan; Zhang, Jianyun; Zhou, Qingsong; Li, Xiaobo

    2018-03-07

    In this paper, we consider the problem of tracking the direction of arrivals (DOA) and the direction of departure (DOD) of multiple targets for bistatic multiple-input multiple-output (MIMO) radar. A high-precision tracking algorithm for target angle is proposed. First, the linear relationship between the covariance matrix difference and the angle difference of the adjacent moment was obtained through three approximate relations. Then, the proposed algorithm obtained the relationship between the elements in the covariance matrix difference. On this basis, the performance of the algorithm was improved by averaging the covariance matrix element. Finally, the least square method was used to estimate the DOD and DOA. The algorithm realized the automatic correlation of the angle and provided better performance when compared with the adaptive asymmetric joint diagonalization (AAJD) algorithm. The simulation results demonstrated the effectiveness of the proposed algorithm. The algorithm provides the technical support for the practical application of MIMO radar.

  8. High-Cycle Fatigue Resistance of Si-Mo Ductile Cast Iron as Affected by Temperature and Strain Rate

    Science.gov (United States)

    Matteis, Paolo; Scavino, Giorgio; Castello, Alessandro; Firrao, Donato

    2015-09-01

    Silicon-molybdenum ductile cast irons are used to fabricate exhaust manifolds of internal combustion engines of large series cars, where the maximum pointwise temperature at full engine load may be higher than 973 K (700 °C). In this application, high-temperature oxidation and thermo-mechanical fatigue (the latter being caused by the engine start and stop and by the variation of its power output) have been the subject of several studies and are well known, whereas little attention has been devoted to the high-cycle fatigue, arising from the engine vibration. Therefore, the mechanical behavior of Si-Mo cast iron is studied here by means of stress-life fatigue tests up to 10 million cycles, at temperatures gradually increasing up to 973 K (700 °C). The mechanical characterization is completed by tensile and compressive tests and ensuing fractographic examinations; the mechanical test results are correlated with the cast iron microstructure and heat treatment.

  9. Investigation of interference in multiple-input multiple-output wireless transmission at W band for an optical wireless integration system.

    Science.gov (United States)

    Li, Xinying; Yu, Jianjun; Dong, Ze; Zhang, Junwen; Chi, Nan; Yu, Jianguo

    2013-03-01

    We experimentally investigate the interference in multiple-input multiple-output (MIMO) wireless transmission by adjusting the relative locations of horn antennas (HAs) in a 100 GHz optical wireless integration system, which can deliver a 50 Gb/s polarization-division-multiplexing quadrature-phase-shift-keying signal over 80 km single-mode fiber-28 and a 2×2 MIMO wireless link. For the parallel 2×2 MIMO wireless link, each receiver HA can only get wireless power from the corresponding transmitter HA, while for the crossover ones, the receiver HA can get wireless power from two transmitter HAs. At the wireless receiver, polarization demultiplexing is realized by the constant modulus algorithm (CMA) in the digital-signal-processing part. Compared to the parallel case, wireless interference causes about 2 dB optical signal-to-noise ratio penalty at a bit-error ratio (BER) of 3.8×10(-3) for the crossover cases if similar CMA taps are employed. The increase in CMA tap length can reduce wireless interference and improve BER performance. Furthermore, more CMA taps should be adopted to overcome the severe wireless interference when two pairs of transmitter and receiver HAs have different wireless distances.

  10. Direction-of-arrival estimation for co-located multiple-input multiple-output radar using structural sparsity Bayesian learning

    International Nuclear Information System (INIS)

    Wen Fang-Qing; Zhang Gong; Ben De

    2015-01-01

    This paper addresses the direction of arrival (DOA) estimation problem for the co-located multiple-input multiple-output (MIMO) radar with random arrays. The spatially distributed sparsity of the targets in the background makes compressive sensing (CS) desirable for DOA estimation. A spatial CS framework is presented, which links the DOA estimation problem to support recovery from a known over-complete dictionary. A modified statistical model is developed to accurately represent the intra-block correlation of the received signal. A structural sparsity Bayesian learning algorithm is proposed for the sparse recovery problem. The proposed algorithm, which exploits intra-signal correlation, is capable being applied to limited data support and low signal-to-noise ratio (SNR) scene. Furthermore, the proposed algorithm has less computation load compared to the classical Bayesian algorithm. Simulation results show that the proposed algorithm has a more accurate DOA estimation than the traditional multiple signal classification (MUSIC) algorithm and other CS recovery algorithms. (paper)

  11. A Dual-Band Multiple Input Multiple Output Frequency Agile Antenna for GPSL1/Wi-Fi/WLAN2400/LTE Applications

    Directory of Open Access Journals (Sweden)

    Sajid Aqeel

    2016-01-01

    Full Text Available A novel dual-band, single element multiple input multiple output (MIMO dielectric resonator antenna (DRA with a modest frequency tuning ability is presented in this communication. The proposed antenna operates at GPS L1/Bluetooth/Wi-Fi/LTE2500/WLAN2400 frequency bands. A single dielectric resonator element is fed by two coaxial probes to excite the orthogonal modes. A couple of slots are introduced on the ground plane to improve the isolation between antenna ports. The slots also serve the purpose of reconfiguration in the lower band on placement of switches at optimized locations. The measured impedance bandwidth is 5.16% (1.41–1.49 GHz in the lower band and 26% (2.2–2.85 GHz in the higher band. The lower band reconfigures with an impedance bandwidth of 6.5% (1.55–1.65 GHz when PIN diodes are switched ON. The gain, efficiency, correlation coefficient, and diversity gain of the MIMO DRA are presented with a close agreement between simulated and measured results.

  12. Prediction of beta-turns and beta-turn types by a novel bidirectional Elman-type recurrent neural network with multiple output layers (MOLEBRNN).

    Science.gov (United States)

    Kirschner, Andreas; Frishman, Dmitrij

    2008-10-01

    Prediction of beta-turns from amino acid sequences has long been recognized as an important problem in structural bioinformatics due to their frequent occurrence as well as their structural and functional significance. Because various structural features of proteins are intercorrelated, secondary structure information has been often employed as an additional input for machine learning algorithms while predicting beta-turns. Here we present a novel bidirectional Elman-type recurrent neural network with multiple output layers (MOLEBRNN) capable of predicting multiple mutually dependent structural motifs and demonstrate its efficiency in recognizing three aspects of protein structure: beta-turns, beta-turn types, and secondary structure. The advantage of our method compared to other predictors is that it does not require any external input except for sequence profiles because interdependencies between different structural features are taken into account implicitly during the learning process. In a sevenfold cross-validation experiment on a standard test dataset our method exhibits the total prediction accuracy of 77.9% and the Mathew's Correlation Coefficient of 0.45, the highest performance reported so far. It also outperforms other known methods in delineating individual turn types. We demonstrate how simultaneous prediction of multiple targets influences prediction performance on single targets. The MOLEBRNN presented here is a generic method applicable in a variety of research fields where multiple mutually depending target classes need to be predicted. http://webclu.bio.wzw.tum.de/predator-web/.

  13. Direction-of-arrival estimation for co-located multiple-input multiple-output radar using structural sparsity Bayesian learning

    Science.gov (United States)

    Wen, Fang-Qing; Zhang, Gong; Ben, De

    2015-11-01

    This paper addresses the direction of arrival (DOA) estimation problem for the co-located multiple-input multiple-output (MIMO) radar with random arrays. The spatially distributed sparsity of the targets in the background makes compressive sensing (CS) desirable for DOA estimation. A spatial CS framework is presented, which links the DOA estimation problem to support recovery from a known over-complete dictionary. A modified statistical model is developed to accurately represent the intra-block correlation of the received signal. A structural sparsity Bayesian learning algorithm is proposed for the sparse recovery problem. The proposed algorithm, which exploits intra-signal correlation, is capable being applied to limited data support and low signal-to-noise ratio (SNR) scene. Furthermore, the proposed algorithm has less computation load compared to the classical Bayesian algorithm. Simulation results show that the proposed algorithm has a more accurate DOA estimation than the traditional multiple signal classification (MUSIC) algorithm and other CS recovery algorithms. Project supported by the National Natural Science Foundation of China (Grant Nos. 61071163, 61271327, and 61471191), the Funding for Outstanding Doctoral Dissertation in Nanjing University of Aeronautics and Astronautics, China (Grant No. BCXJ14-08), the Funding of Innovation Program for Graduate Education of Jiangsu Province, China (Grant No. KYLX 0277), the Fundamental Research Funds for the Central Universities, China (Grant No. 3082015NP2015504), and the Priority Academic Program Development of Jiangsu Higher Education Institutions (PADA), China.

  14. Ohtlikud lennud / Simo Meinert

    Index Scriptorium Estoniae

    Meinert, Simo

    2006-01-01

    ETV uus algupärane krimisari "Ohtlik lend" : stsenarist Mihkel Ulman : lavastaja Ain Prosa : produtsent Raivo Suviste : peaosades Elisabet Tamm, Marko Matvere : Balti Video. Sama ka : Teleleht nr. 38, lk. 6-7 : ill

  15. A method to synchronize signals from multiple patient monitoring devices through a single input channel for inclusion in list-mode acquisitions

    International Nuclear Information System (INIS)

    O’Connor, J. Michael; Pretorius, P. Hendrik; Johnson, Karen; King, Michael A.

    2013-01-01

    minimal external hardware and software modification through a single input channel, while still recording cardiac gating signals

  16. A method to synchronize signals from multiple patient monitoring devices through a single input channel for inclusion in list-mode acquisitions

    Energy Technology Data Exchange (ETDEWEB)

    O’Connor, J. Michael; Pretorius, P. Hendrik; Johnson, Karen; King, Michael A., E-mail: Michael.King@umassmed.edu [Department of Radiology, University of Massachusetts Medical School, Worcester, Massachusetts 01655 (United States)

    2013-12-15

    minimal external hardware and software modification through a single input channel, while still recording cardiac gating signals.

  17. LA CULTURA COMO MERCANCÍA. UNA APROXIMACIÓN A LOS NOVÍSIMOS DESDE LA PERSPECTIVA ADORNIANA DE LA INDUSTRIA CULTURAL

    Directory of Open Access Journals (Sweden)

    María Ayllón Barasoain

    2014-09-01

    Full Text Available Una investigación crítica en torno al ámbito literario implica necesariamente el acercamiento desde herramientas de análisis que pongan de relieve las implicaciones políticas, económicas y de dominio que muchas veces imperan en la configuración de los cánones y modelos culturales. En este sentido, el presente texto propone abordar un fenómeno editorial de gran relevancia en el panorama español, como es la antología poética Nueve novísimos poetas españoles, a partir de la perspectiva del concepto adorniano de industria cultural, no sólo desde la acepción teórica propuesta por el filósofo alemán sino también considerando sus usos concretos en el panorama nacional del tardofranquismo.

  18. Fiber-wireless transmission system of 108  Gb/sdata over 80 km fiber and 2×2multiple-input multiple-output wireless links at 100 GHz W-band frequency.

    Science.gov (United States)

    Li, Xinying; Dong, Ze; Yu, Jianjun; Chi, Nan; Shao, Yufeng; Chang, G K

    2012-12-15

    We experimentally demonstrate a seamlessly integrated fiber-wireless system that delivers a 108  Gb/s signal through 80 km fiber and 1 m wireless transport over free space at 100 GHz adopting polarization-division-multiplexing quadrature-phase-shift-keying (PDM-QPSK) modulation and heterodyning coherent detection. The X- and Y-polarization components of the optical PDM-QPSK baseband signal are simultaneously upconverted to 100 GHz wireless carrier by optical polarization-diversity heterodyne beating, and then independently transmitted and received by two pairs of transmitter and receiver antennas, which form a 2×2 multiple-input multiple-output wireless link. At the wireless receiver, two-stage downconversion is performed firstly in the analog domain based on balanced mixer and sinusoidal radio frequency signal, and then in the digital domain based on digital signal processing (DSP). Polarization demultiplexing is realized by the constant modulus algorithm in the DSP part at the receiver. The bit-error ratio for the 108  Gb/s PDM-QPSK signal is less than the pre-forward-error-correction threshold of 3.8×10(-3) after both 1 m wireless delivery at 100 GHz and 80 km single-mode fiber-28 transmission. To our knowledge, this is the first demonstration to realize 100  Gb/s signal delivery through both fiber and wireless links at 100 GHz.

  19. Grey-box state-space identification of nonlinear mechanical vibrations

    Science.gov (United States)

    Noël, J. P.; Schoukens, J.

    2018-05-01

    The present paper deals with the identification of nonlinear mechanical vibrations. A grey-box, or semi-physical, nonlinear state-space representation is introduced, expressing the nonlinear basis functions using a limited number of measured output variables. This representation assumes that the observed nonlinearities are localised in physical space, which is a generic case in mechanics. A two-step identification procedure is derived for the grey-box model parameters, integrating nonlinear subspace initialisation and weighted least-squares optimisation. The complete procedure is applied to an electrical circuit mimicking the behaviour of a single-input, single-output (SISO) nonlinear mechanical system and to a single-input, multiple-output (SIMO) geometrically nonlinear beam structure.

  20. Rapid impact testing for quantitative assessment of large populations of bridges

    Science.gov (United States)

    Zhou, Yun; Prader, John; DeVitis, John; Deal, Adrienne; Zhang, Jian; Moon, Franklin; Aktan, A. Emin

    2011-04-01

    Although the widely acknowledged shortcomings of visual inspection have fueled significant advances in the areas of non-destructive evaluation and structural health monitoring (SHM) over the last several decades, the actual practice of bridge assessment has remained largely unchanged. The authors believe the lack of adoption, especially of SHM technologies, is related to the 'single structure' scenarios that drive most research. To overcome this, the authors have developed a concept for a rapid single-input, multiple-output (SIMO) impact testing device that will be capable of capturing modal parameters and estimating flexibility/deflection basins of common highway bridges during routine inspections. The device is composed of a trailer-mounted impact source (capable of delivering a 50 kip impact) and retractable sensor arms, and will be controlled by an automated data acquisition, processing and modal parameter estimation software. The research presented in this paper covers (a) the theoretical basis for SISO, SIMO and MIMO impact testing to estimate flexibility, (b) proof of concept numerical studies using a finite element model, and (c) a pilot implementation on an operating highway bridge. Results indicate that the proposed approach can estimate modal flexibility within a few percent of static flexibility; however, the estimated modal flexibility matrix is only reliable for the substructures associated with the various SIMO tests. To overcome this shortcoming, a modal 'stitching' approach for substructure integration to estimate the full Eigen vector matrix is developed, and preliminary results of these methods are also presented.

  1. Influence of Antenna Characteristics on Elevation Dependence of Building Penetration Loss for High Elevation Links

    Directory of Open Access Journals (Sweden)

    M. Kvicera

    2012-12-01

    Full Text Available Building penetration loss models presented in our previous paper [1] were valid for various scenarios, propagation conditions, frequency bands and hemispherical receiving antenna pointing towards zenith. These models had a significantly rising trend of penetration loss with increasing elevation angle of the link in common. In this paper we show that when working with non-isotropic terminal antennas, this trend relates primarily to the elevation trend of the corresponding reference level dependent on the receiving antenna radiation pattern. This is demonstrated by the results of single-input multiple-output (SIMO measurement trials performed at L-band in an office building and a brick building in the city of Prague. Further, based on the detailed analysis, a method to modify the elevation trend of a particular penetration loss model for different receiving antenna radiation patterns is derived and experimentally validated.

  2. Performance analysis of correlated multi-channels in cognitive radio sensor network based smart grid

    CSIR Research Space (South Africa)

    Ogbodo, EU

    2017-09-01

    Full Text Available €  (7) Where = 1 − 1 √𝑀 ; = 3 𝑀−1 ;𝑠𝑖 = 2𝑠𝑖𝑛𝑖𝜋/4𝑛; M is the constellation order which may be 4, 16, 32, etc.; n is the number of iteration. We can then derive MGF based average error probability by simply...-QAM under correlated fading channels distribution conditions such that the signals are received at the various sensor nodes. We consider a dual-branch single-input multiple- output (SIMO) system. The received signal at the receiver can be modelled as: 𝑊𝑖(ð...

  3. LMI-based gain scheduled controller synthesis for a class of linear parameter varying systems

    DEFF Research Database (Denmark)

    Bendtsen, Jan Dimon; Anderson, Brian; Lanzon, Alexander

    2006-01-01

    This paper presents a novel method for constructing controllers for a class of single-input multiple-output (SIMO) linear parameter varying (LPV) systems. This class of systems encompasses many physical systems, in particular systems where individual components vary with time, and is therefore...... of significant practical relevance to control designers. The control design presented in this paper has the properties that the system matrix of the closed loop is multi-affine in the various scalar parameters, and that the resulting controller ensures a certain degree of stability for the closed loop even when...... as a standard linear time-invariant (LTI) design combined with a set of linear matrix inequalities, which can be solved efficiently with software tools. The design procedure is illustrated by a numerical example....

  4. Using random response input in Ibrahim Time Domain

    DEFF Research Database (Denmark)

    Olsen, Peter; Brincker, R.

    2013-01-01

    In this paper the time domain technique Ibrahim Time Domain (ITD) is used to analyze random time data. ITD is known to be a technique for identification of output only systems. The traditional formulation of ITD is claimed to be limited, when identifying closely spaced modes, because....... In this article it is showed that when using the modified ITD random time data can be analyzed. The application of the technique is displayed by a case study, with simulations and experimental data....... of the technique being Single Input Multiple Output (SIMO). It has earlier been showed that when modifying ITD with Toeplitz matrix averaging. Identification of time data with closely spaced modes is improved. In the traditional formulation of ITD the time data has to be free decays or impulse response functions...

  5. Local bilinear multiple-output quantile/depth regression

    Czech Academy of Sciences Publication Activity Database

    Hallin, M.; Lu, Z.; Paindaveine, D.; Šiman, Miroslav

    2015-01-01

    Roč. 21, č. 3 (2015), s. 1435-1466 ISSN 1350-7265 R&D Projects: GA MŠk(CZ) 1M06047 Institutional support: RVO:67985556 Keywords : conditional depth * growth chart * halfspace depth * local bilinear regression * multivariate quantile * quantile regression * regression depth Subject RIV: BA - General Mathematics Impact factor: 1.372, year: 2015 http://library.utia.cas.cz/separaty/2015/SI/siman-0446857.pdf

  6. A Monte Carlo study on multiple output stochastic frontiers

    DEFF Research Database (Denmark)

    Henningsen, Geraldine; Henningsen, Arne; Jensen, Uwe

    2015-01-01

    , dividing all other output quantities by the selected outputquantity, and using these ratios as regressors (OD). Another approach is the stochasticray production frontier (SR), which transforms the output quantities into their Euclideandistance as the dependent variable and their polar coordinates...... of the approaches is clearly superior. However, considerable differences are found between the estimates at single replications. Taking average efficiencies from both approaches gives clearly better efficiency estimates than taking just the OD or the SR. In the case of zero values in the output quantities, the SR...

  7. Estudio de las escenas: Jesús es condedado a muerte y Jesús ante Poncio Pilato, del conjunto pictórico de la iglesia del Santísimo Cristo de Benigànim. Estado de conservación, propuesta de intervención y presupuesto económico de restauración.

    OpenAIRE

    LLOPIS SERRANO, PAULA

    2015-01-01

    Este trabajo final de grado expone el estudio técnico, del estado de conservación, la propuesta de intervención, y el presupuesto de restauración de les dos escenas pertenecientes al conjunto pictórico de la Iglesia del Santísimo Cristo de Benigpànim. El estudio prevé un enfoque, tanto documental como analítico, determinando la técnica pictórica, el estado de conservación en el que se encuentra, y las posibles intervenciones anteriores. This final course work explains the technical work...

  8. Multi-diversity combining and selection for relay-assisted mixed RF/FSO system

    Science.gov (United States)

    Chen, Li; Wang, Weidong

    2017-12-01

    We propose and analyze multi-diversity combining and selection to enhance the performance of relay-assisted mixed radio frequency/free-space optics (RF/FSO) system. We focus on a practical scenario for cellular network where a single-antenna source is communicating to a multi-apertures destination through a relay equipped with multiple receive antennas and multiple transmit apertures. The RF single input multiple output (SIMO) links employ either maximal-ratio combining (MRC) or receive antenna selection (RAS), and the FSO multiple input multiple output (MIMO) links adopt either repetition coding (RC) or transmit laser selection (TLS). The performance is evaluated via an outage probability analysis over Rayleigh fading RF links and Gamma-Gamma atmospheric turbulence FSO links with pointing errors where channel state information (CSI) assisted amplify-and-forward (AF) scheme is considered. Asymptotic closed-form expressions at high signal-to-noise ratio (SNR) are also derived. Coding gain and diversity order for different combining and selection schemes are further discussed. Numerical results are provided to verify and illustrate the analytical results.

  9. Investigations in Satellite MIMO Channel Modeling: Accent on Polarization

    Directory of Open Access Journals (Sweden)

    Karagiannidis George K

    2007-01-01

    Full Text Available Due to the much different environment in satellite and terrestrial links, possibilities in and design of MIMO systems are rather different as well. After pointing out these differences and problems arising from them, two MIMO designs are shown rather well adapted to satellite link characteristics. Cooperative diversity seems to be applicable; its concept is briefly presented without a detailed discussion, leaving solving particular satellite problems to later work. On the other hand, a detailed discussion of polarization time-coded diversity (PTC is given. A physical-statistical model for dual-polarized satellite links is presented together with measuring results validating the model. The concept of 3D polarization is presented as well as briefly describing compact 3D-polarized antennas known from the literature and applicable in satellite links. A synthetic satellite-to-indoor link is constructed and its electromagnetic behavior is simulated via the FDTD (finite-difference time-domain method. Previous result of the authors states that in 3D-PTC situations, MIMO capacity can be about two times higher than SIMO (single-input multiple-output capacity while a diversity gain of nearly is further verified via extensive FDTD computer simulation.

  10. Low complexity algorithms to independently and jointly estimate the location and range of targets using FMCW

    KAUST Repository

    Ahmed, Sajid

    2017-05-12

    The estimation of angular-location and range of a target is a joint optimization problem. In this work, to estimate these parameters, by meticulously evaluating the phase of the received samples, low complexity sequential and joint estimation algorithms are proposed. We use a single-input and multiple-output (SIMO) system and transmit frequency-modulated continuous-wave signal. In the proposed algorithm, it is shown that by ignoring very small value terms in the phase of the received samples, fast-Fourier-transform (FFT) and two-dimensional FFT can be exploited to estimate these parameters. Sequential estimation algorithm uses FFT and requires only one received snapshot to estimate the angular-location. Joint estimation algorithm uses two-dimensional FFT to estimate the angular-location and range of the target. Simulation results show that joint estimation algorithm yields better mean-squared-error (MSE) for the estimation of angular-location and much lower run-time compared to conventional MUltiple SIgnal Classification (MUSIC) algorithm.

  11. Low complexity algorithms to independently and jointly estimate the location and range of targets using FMCW

    KAUST Repository

    Ahmed, Sajid; Jardak, Seifallah; Alouini, Mohamed-Slim

    2017-01-01

    The estimation of angular-location and range of a target is a joint optimization problem. In this work, to estimate these parameters, by meticulously evaluating the phase of the received samples, low complexity sequential and joint estimation algorithms are proposed. We use a single-input and multiple-output (SIMO) system and transmit frequency-modulated continuous-wave signal. In the proposed algorithm, it is shown that by ignoring very small value terms in the phase of the received samples, fast-Fourier-transform (FFT) and two-dimensional FFT can be exploited to estimate these parameters. Sequential estimation algorithm uses FFT and requires only one received snapshot to estimate the angular-location. Joint estimation algorithm uses two-dimensional FFT to estimate the angular-location and range of the target. Simulation results show that joint estimation algorithm yields better mean-squared-error (MSE) for the estimation of angular-location and much lower run-time compared to conventional MUltiple SIgnal Classification (MUSIC) algorithm.

  12. A Comparative Study of Control Methods for a Robotic Manipulator with Six DOF in Simulation

    Directory of Open Access Journals (Sweden)

    Smyrnaiou Georgia P.

    2017-01-01

    Full Text Available In this paper a comparative study of the classical control methods for the testing of a mathematical model, which controls six actuators of a six degrees of freedom robotic arm with a single controller, is illustrated, aiming to the constructive simplification of the system. In more detail, a mathematical model of the system is designed which simulates all mechanical parts, including 5-way directional pneumatic valve, the pneumatic actuators/pistons and the mathematical model of the controller. The purpose of the above is the tuning of a Single Input, Multiple Output (SIMO controller which will direct the motion of the six pneumatic pistons. The thorough analysis of the implementation of the pneumatic system in Matlab/Simulink environment is followed by experimentation and results using Proportional (P, Proportional-Integral (PI, Proportional-Derivative (PD and Proportional-Integral-Derivative (PID controllers. The simulation results show the advantages of the above classical control methods on the robotic human arm which imitating human motion and made by a well-known company in the field of pneumatic automation.

  13. Sinfonía VI al Santísimo

    OpenAIRE

    Stamitz, Charles (1745-1801)

    2010-01-01

    Tabla de contenido: 1. Violín primero; 2. Violín segundo; 3. Viola; 4. Cuerno primero; 5. Cuerno segundo; 6. BajoFolio 1. Bajo a la SinfoníaFolio 3. Violín primeroFolio 5. Violín segundoFolio 7. ViolaFolio 9. Corno primeroFolio 10. Corno segundo

  14. Sinfonía IV al Santísimo

    OpenAIRE

    Stamitz, Charles (1745-1801)

    2010-01-01

    Tabla de contenido: 1. Violín primero; 2. Violín segundo; 3. Viola; 4. Cuerno primero; 5. Cuerno segundo; 6. Bajo.Folio 1v. Violín primero.Folio 3v. Violín segundo.Folio 5. Viola.Folio 6. Cuerno primero.Folio 7. Cuerno segundo.Folio 8. Bajo.

  15. Tänapäeva lood / Simo Meinert

    Index Scriptorium Estoniae

    Meinert, Simo

    2006-01-01

    Eesti lugude projekti raames valminud uued dokumentaalfilmid, mida näeb lähemal ajal ETVs : Aivo Spitsonoki "Lehmakauplemine", Urmas Eero Liivi "Casting", "Soome tööle", "Täkutallinn", "Udmurditar ja mulk", "Tähelepanu, start!", "Tuhande ühe öö muinasjutt"

  16. Johann Urbi vanatädi / Simo Meinert

    Index Scriptorium Estoniae

    Meinert, Simo

    2005-01-01

    Kanal 2 asub näitama Hollywoodi draamasarja "Mägi" ("The Mountain"), kus astub üles laulja Tarmo Urbi poeg Johann. Urbide perekondlikest suhetest räägib laulja Silvia Urb. Lisatud seriaali lühitutvustus ning loetelu J. Urbi varasematest rollidest. Sama artikkel ilma lisadeta: Teleleht nr. 22, 2005/Jun/6, lk. 7 : ill

  17. A discriminator with a current-sum multiplicity output for the PHENIX multiplicity vertex detector

    International Nuclear Information System (INIS)

    Smith, R.S.; Kennedy, E.J.; Jackson, R.G.

    1996-01-01

    A current output multiplicity discriminator for use in the front-end electronics (FEE) of the Multiplicity Vertex Detector (MVD) for the PHENIX detector at RHIC has been fabricated in the a 1.2-micro CMOS, n-well process. The discriminator is capable of triggering on input signals ranging from 0.25 MIP to 5 MIP. Frequency response of the discriminator is such that the circuit is capable of generating an output for every bunch crossing (105 ns) of the RHIC collider. Channel-to-channel threshold matching was adjustable to ± 4 mV. One channel of multiplicity discriminator occupied an area of 85 micro x 630 micro and consumed 515 microW from a single 5-V supply. Details of the design and results from prototype device testing are presented

  18. Beamspace Multiple Input Multiple Output. Part II: Steerable Antennas in Mobile Ad Hoc Networks

    Science.gov (United States)

    2016-09-01

    to the transmitter with half the channel transfer function power , since the actual receiver dwells on each channel only half the time. Fourth diagram...steering in a wireless network to maximize signal power and minimize interference [8–10]. The ability to switch beams adds another diversity dimension to...channel transfer function power , since the actual receiver dwells on each channel only half the time. Fourth diagram: The transmit array sends four

  19. Multiple output power supply circuit for an ion engine with shared upper inverter

    Science.gov (United States)

    Cardwell, Jr., Gilbert I. (Inventor); Phelps, Thomas K. (Inventor)

    2001-01-01

    A power supply circuit for an ion engine suitable for a spacecraft is coupled to a bus having a bus input and a bus return. The power supply circuit has a first primary winding of a first transformer. An upper inverter circuit is coupled to the bus input and the first primary winding. The power supply circuit further includes a first lower inverter circuit coupled to the bus return and the first primary winding. The second primary winding of a second transformer is coupled to the upper inverter circuit. A second lower inverter circuit is coupled to the bus return and the second primary winding.

  20. Multiple-output all-optical header processing technique based on two-pulse correlation principle

    NARCIS (Netherlands)

    Calabretta, N.; Liu, Y.; Waardt, de H.; Hill, M.T.; Khoe, G.D.; Dorren, H.J.S.

    2001-01-01

    A serial all-optical header processing technique based on a two-pulse correlation principle in a semiconductor laser amplifier in a loop mirror (SLALOM) configuration that can have a large number of output ports is presented. The operation is demonstrated experimentally at a 10Gbit/s Manchester

  1. Surprise! Infants Consider Possible Bases of Generalization for a Single Input Example

    Science.gov (United States)

    Gerken, LouAnn; Dawson, Colin; Chatila, Razanne; Tenenbaum, Josh

    2015-01-01

    Infants have been shown to generalize from a small number of input examples. However, existing studies allow two possible means of generalization. One is via a process of noting similarities shared by several examples. Alternatively, generalization may reflect an implicit desire to explain the input. The latter view suggests that generalization…

  2. A computer simulation of an adaptive noise canceler with a single input

    Science.gov (United States)

    Albert, Stuart D.

    1991-06-01

    A description of an adaptive noise canceler using Widrows' LMS algorithm is presented. A computer simulation of canceler performance (adaptive convergence time and frequency transfer function) was written for use as a design tool. The simulations, assumptions, and input parameters are described in detail. The simulation is used in a design example to predict the performance of an adaptive noise canceler in the simultaneous presence of both strong and weak narrow-band signals (a cosited frequency hopping radio scenario). On the basis of the simulation results, it is concluded that the simulation is suitable for use as an adaptive noise canceler design tool; i.e., it can be used to evaluate the effect of design parameter changes on canceler performance.

  3. GLASSgo – Automated and Reliable Detection of sRNA Homologs From a Single Input Sequence

    Directory of Open Access Journals (Sweden)

    Steffen C. Lott

    2018-04-01

    Full Text Available Bacterial small RNAs (sRNAs are important post-transcriptional regulators of gene expression. The functional and evolutionary characterization of sRNAs requires the identification of homologs, which is frequently challenging due to their heterogeneity, short length and partly, little sequence conservation. We developed the GLobal Automatic Small RNA Search go (GLASSgo algorithm to identify sRNA homologs in complex genomic databases starting from a single sequence. GLASSgo combines an iterative BLAST strategy with pairwise identity filtering and a graph-based clustering method that utilizes RNA secondary structure information. We tested the specificity, sensitivity and runtime of GLASSgo, BLAST and the combination RNAlien/cmsearch in a typical use case scenario on 40 bacterial sRNA families. The sensitivity of the tested methods was similar, while the specificity of GLASSgo and RNAlien/cmsearch was significantly higher than that of BLAST. GLASSgo was on average ∼87 times faster than RNAlien/cmsearch, and only ∼7.5 times slower than BLAST, which shows that GLASSgo optimizes the trade-off between speed and accuracy in the task of finding sRNA homologs. GLASSgo is fully automated, whereas BLAST often recovers only parts of homologs and RNAlien/cmsearch requires extensive additional bioinformatic work to get a comprehensive set of homologs. GLASSgo is available as an easy-to-use web server to find homologous sRNAs in large databases.

  4. Multiple Antennas Systems and Full Duplex Relay Systems with Hardware Impairments: New Performance Limits

    KAUST Repository

    Javed, Sidrah

    2016-12-01

    Next generation of wireless communication mostly relies on multiple-input multipleoutput (MIMO) configuration and full-duplex relaying to improve data-rates, spectrale efficiency, spatial-multiplexing, quality-of-service and energy-efficiency etc. However, multiple radio frequency (RF) transceivers in MIMO system and multi-hops in relay networks, accumulate transceiver impairments, rendering an unacceptable system performance. Majority of the technical contributions either assume ideal hardware or inappropriately model hardware impairments which often induce misleading results especially for high data-rate communication systems. We propose statistical mathematical modeling of various hardware impairment (HWI) to characterize their deteriorating effects on the information signal. In addition, we model the aggregate HWI as improper Gaussian signaling (IGS), to fully characterize their asymmetric properties and the self-interfering signal attribute under I/Q imbalance. The proposed model encourages to adopt asymmetric transmission scheme, as opposed to traditional symmetric signaling. First, we present statistical baseband equivalent mathematical models for general MIMO system and two special scenarios of receive and transmit diversity systems under HWI. Then, we express their achievable rate under PGS and IGS transmit schemes. Moreover, we tune the IGS statistical characteristics to maximize the achievable rate. We also present optimal beam-forming/pre-coding and receive combiner vector for multiple-input single-output (MISO) and single-input multiple output (SIMO) systems, which lead to SDNR maximization. Moreover, we propose an adaptive scheme to switch between maximal IGS (MIGS) and PGS transmission based on the described conditions to reduce computational overhead. Subsequently, two case studies are presented. 1) Outage analysis has been carried out for SIMO, under transceiver distortion noise, for two diversity combining schemes 2) The benefits of employing IGS

  5. Effective seat-to-head transmissibility in whole-body vibration: Effects of posture and arm position

    Science.gov (United States)

    Rahmatalla, Salam; DeShaw, Jonathan

    2011-12-01

    Seat-to-head transmissibility is a biomechanical measure that has been widely used for many decades to evaluate seat dynamics and human response to vibration. Traditionally, transmissibility has been used to correlate single-input or multiple-input with single-output motion; it has not been effectively used for multiple-input and multiple-output scenarios due to the complexity of dealing with the coupled motions caused by the cross-axis effect. This work presents a novel approach to use transmissibility effectively for single- and multiple-input and multiple-output whole-body vibrations. In this regard, the full transmissibility matrix is transformed into a single graph, such as those for single-input and single-output motions. Singular value decomposition and maximum distortion energy theory were used to achieve the latter goal. Seat-to-head transmissibility matrices for single-input/multiple-output in the fore-aft direction, single-input/multiple-output in the vertical direction, and multiple-input/multiple-output directions are investigated in this work. A total of ten subjects participated in this study. Discrete frequencies of 0.5-16 Hz were used for the fore-aft direction using supported and unsupported back postures. Random ride files from a dozer machine were used for the vertical and multiple-axis scenarios considering two arm postures: using the armrests or grasping the steering wheel. For single-input/multiple-output, the results showed that the proposed method was very effective in showing the frequencies where the transmissibility is mostly sensitive for the two sitting postures and two arm positions. For multiple-input/multiple-output, the results showed that the proposed effective transmissibility indicated higher values for the armrest-supported posture than for the steering-wheel-supported posture.

  6. Error Probability of Binary and -ary Signals with Spatial Diversity in Nakagami- (Hoyt) Fading Channels

    OpenAIRE

    Duong Trung Q; Shin Hyundong; Hong Een-Kee

    2007-01-01

    We analyze the exact average symbol error probability (SEP) of binary and -ary signals with spatial diversity in Nakagami- (Hoyt) fading channels. The maximal-ratio combining and orthogonal space-time block coding are considered as diversity techniques for single-input multiple-output and multiple-input multiple-output systems, respectively. We obtain the average SEP in terms of the Lauricella multivariate hypergeometric function . The analysis is verified by comparing with Monte Carlo simu...

  7. Integrated reconfigurable multiple-input–multiple-output antenna system with an ultra-wideband sensing antenna for cognitive radio platforms

    KAUST Repository

    Hussain, Rifaqat; Sharawi, Mohammad S.

    2015-01-01

    . The developed model can be used as a complete antenna platform for cognitive radio applications. The antenna system is developed on a single substrate area of dimensions 65 × 120 mm2. The proposed sensing antenna is used to cover a wide range

  8. Simulation Performance of Multiple-Input Multiple-Output Systems Employing Single-Carrier Modulation and Orthogonal Frequency Division Multiplexing

    National Research Council Canada - National Science Library

    Saglam, Halil D

    2004-01-01

    ...) systems utilizing Alamouti-based space-time block coding (STBC) technique. The MIMO communication systems using STBC technique employing both single-carrier modulation and orthogonal frequency division multiplexing (OFDM...

  9. Regionalized sensitivity analysis with respect to multiple outputs - and an application for real-time building space exploration

    DEFF Research Database (Denmark)

    Østergård, Torben

    coordinate plot (PCP) is a popular tool, because it is easy to use in “real-time” – even for multiple decision-makers. However, the PCP becomes unmanageable if it contains many variables, e.g. more than 10–15. Since building simulations typically involve a lot more parameters, we would like to reduce...

  10. On the average complexity of sphere decoding in lattice space-time coded multiple-input multiple-output channel

    KAUST Repository

    Abediseid, Walid

    2012-01-01

    complexity of sphere decoding for the quasi- static, lattice space-time (LAST) coded MIMO channel. Specifically, we drive an upper bound of the tail distribution of the decoder's computational complexity. We show that when the computational complexity exceeds

  11. An improved partially interleaved transformer structure for high-voltage high-frequency multiple-output applications

    DEFF Research Database (Denmark)

    Zhao, Bin; Ouyang, Ziwei; Andersen, Michael A. E.

    2017-01-01

    . The proposed structure features lower leakage inductance, smaller AC capacitance and lower rate of AC-DC resistance, which is suitable for high-frequency high-efficiency applications. A planar transformer with the proposed structure was built and tested in an LCLC resonant converter, where the input voltage...

  12. Error Probability of Binary and -ary Signals with Spatial Diversity in Nakagami- (Hoyt Fading Channels

    Directory of Open Access Journals (Sweden)

    Duong Trung Q

    2007-01-01

    Full Text Available We analyze the exact average symbol error probability (SEP of binary and -ary signals with spatial diversity in Nakagami- (Hoyt fading channels. The maximal-ratio combining and orthogonal space-time block coding are considered as diversity techniques for single-input multiple-output and multiple-input multiple-output systems, respectively. We obtain the average SEP in terms of the Lauricella multivariate hypergeometric function . The analysis is verified by comparing with Monte Carlo simulations and we further show that our general SEP expressions particularize to the previously known results for Rayleigh ( = 1 and single-input single-output (SISO Nakagami- cases.

  13. A CMOS/SOI Single-input PWM Discriminator for Low-voltage Body-implanted Applications

    Directory of Open Access Journals (Sweden)

    Jader A. De Lima

    2002-01-01

    Full Text Available A CMOS/SOI circuit to decode Pulse-Width Modulation (PWM signals is presented as part of a body-implanted neurostimulator for visual prosthesis. Since encoded data is the sole input to the circuit, the decoding technique is based on a novel double-integration concept and does not require low-pass filtering. Non-overlapping control phases are internally derived from the incoming pulses and a fast-settling comparator ensures good discrimination accuracy in the megahertz range. The circuit was integrated on a 2 μm single-metal thin-film CMOS/SOI fabrication process and has an effective area of 2 mm2. Measured resolution of encoding parameter α is better than 10% at 6 MHz and VDD = 3.3 V. Idle-mode consumption is 340 μW. Pulses of frequencies up to15 MHz and α =10% can be discriminated for 2.3 V ≤ VDD ≤ 3.3 V. Such an excellent immunity to VDD deviations meets a design specification with respect to inherent coupling losses on transmitting data and power by means of a transcutaneous link.

  14. Single input state, single–mode fiber–based polarization sensitive optical frequency domain imaging by eigenpolarization referencing

    Science.gov (United States)

    Lippok, Norman; Villiger, Martin; Jun, Chang–Su; Bouma, Brett E.

    2015-01-01

    Fiber–based polarization sensitive OFDI is more challenging than free–space implementations. Using multiple input states, fiber–based systems provide sample birefringence information with the benefit of a flexible sample arm but come at the cost of increased system and acquisition complexity, and either reduce acquisition speed or require increased acquisition bandwidth. Here we show that with the calibration of a single polarization state, fiber–based configurations can approach the conceptual simplicity of traditional free–space configurations. We remotely control the polarization state of the light incident at the sample using the eigenpolarization states of a wave plate as a reference, and determine the Jones matrix of the output fiber. We demonstrate this method for polarization sensitive imaging of biological samples. PMID:25927775

  15. Marketing library and information services: international perspectives (Gupta; Konntz; Massísimo; Savard)

    OpenAIRE

    Fernández Marcial, Viviana

    2007-01-01

    This article reviews different experiences in library marketing developed around the world. It focuses on the marketing mix, the central element of a plan of marketing in which four aspects are defined, the four "p": the product, price, place and promotion.

  16. A Novel Current-Mode SIMO Type Universal Filter Using CFTAs

    OpenAIRE

    Herencsár, Norbert; Koton, Jaroslav; Vrba, Kamil; Mišurec, Jiří

    2009-01-01

    In this paper a new active element for the realization of current-mode analog blocks Current Follower Transconductance Amplifier (CFTA) is presented. The element is a combination of the Current Follower (CF) and the Balanced Output Transconductance Amplifier (BOTA). In the paper we also document another extended active element CFTA which has more current outputs than can be realized by the UCC-N1B circuit, which was developed at our workplace. The application of this active element is shown o...

  17. [Aria con violines al Santísimo Sacramento. Ay, Dueño enamorado

    OpenAIRE

    Anónimo

    2010-01-01

    Tabla de contenido: 1. Violín primero; 2. Violín segundo; 3. Violón; 4. Órgano; 5. Recitado y aria.Folio 1. Violín primero.Folio 3. Violín segundo.Folio 5. Violón.Folio 7. Órgano.Folio 9. Recitado y aria.Folio 9-10. Letra.

  18. Reflektuojančio būsimo specialiojo pedagogo profesinio apsisprendimo patirtys

    OpenAIRE

    Bubnys, Remigijus; Žydžiūnaitė, Vilma

    2008-01-01

    Fenomenologinės hermeneutikos rezultatai atskleidė būsimų specialiųjų pedagogų profesinį apsisprendimą lemiančius veiksnius. Studentų pasirinkimą studijuoti lemia į žmogų orientuoti ir savirealizacijos veiksniai: poreikis rūpintis kitais, meilė vaikams, noras padėti žmonėms, įgyti žinių bei poreikis perimti profesinį vaidmenį. Apsisprendimą nebūti specialiuoju pedagogu stiprina komplikuotas darbo pobūdis, asmeninių įgūdžių stoka bei specialiųjų ugdymosi poreikių turinčių vaikų individualūs el...

  19. Rein Oja, Kirsti Timmer ja Avo Põhjala võitluskunstidest / Simo Meinert

    Index Scriptorium Estoniae

    Meinert, Simo

    2001-01-01

    Seriaali "Walker - Texase korravalvur" nimitegelast mängiva Chuck Norrise võitluskunstide oskusi aluseks võttes arendatakse teemat idamaa võitluskunstidest kinos, teatris ja elus. Ka : Teleleht nr. 49, lk. 42-43

  20. Guerra civil y juicios sumarísimos en Linares (1936-1945

    Directory of Open Access Journals (Sweden)

    José Herrador Haro

    2009-12-01

    Full Text Available Este resumen sobre la Guerra Civil en Linares tiene como objetivo primordial preservar para la posteridad la memoria histórica contenida en los testimonios orales de personas, de una y otra ideología, sobrevivientes al conflicto y enraizados en él. Sus informaciones han sido el tamiz para contactar las halladas en fuentes documentales de la época y las actuales. Veremos que dos regímenes diferentes (uno democrático y otro dictatorial coincidían –absurdamente- en un mismo planteamiento político: eliminar a las personas non gratas. De esta manera queremos aportar una visión más amplia y documentada sobre el fenómeno de la represión durante la Guerra Civil.___________________ABSTRACT:The main objective of this summary about the Civil War in Lineares is to preserve the historical memory contained in the oral testimonies of people, from both camps, who survived the conflict and who are deeply rooted in it. The information coming from them has been a filter to compare the findings from documentary sources of that time and from the present. We can see that two different regimes (one democratic and the other dictatorial coincided – absurdly – in the same political approach: to eliminate every persona non grata. In this way we want to provide a broader and better documented view on the phenomenon of repression during the Civil War.

  1. Kagu-Eesti töötus näitab kasvutendentsi / Simo Meinert

    Index Scriptorium Estoniae

    Meinert, Simo

    1994-01-01

    Joonis: 1. Eestis töötud hõiverühmiti 1994.a. 1. juuli seisuga; 2. Vabad töökohad Eestis hõiverühmiti 1994.a. 1. aug. seisuga; 3. Vabade töökohtade muutus Eestis hõiverühmiti 1994.a. 1. aug. seisuga. Tabel: Töötute jaotumine eelneva hõiveala järgi 1994.a. 1. juuli seisuga

  2. Installation of Radiometric Sorting throughout the Cogema-Simo Mining Complex at Lodeve. [Uranium ores

    Energy Technology Data Exchange (ETDEWEB)

    Grenier, J.; Winter, J.M.; Deville, P.

    1986-06-01

    The ores of Lodeve present no physical characteristics which permit an elimination of the lowest grade fractions, with the exception of the radioactivity and the radium which accompanies the uranium. The mine therefore turned to radiometric pebble-by-pebble sorting on a machine model M 17 of Ore Sorters who have a monopoly of this type of equipment; this permits an operation over a size range from 25 to 160 mm. Sampling of the deposit investigation of pebble samples, construction of the sorting plant and commissioning are described.

  3. Space-division-multiplexed transmission of 3x3 multiple-input multiple-output wireless signals over conventional graded-index multimode fiber.

    Science.gov (United States)

    Lei, Yi; Li, Jianqiang; Fan, Yuting; Yu, Dawei; Fu, Songnian; Yin, Feifei; Dai, Yitang; Xu, Kun

    2016-12-12

    In this paper, we experimentally demonstrate space-division-multiplexed (SDM) transmission of IEEE 802.11ac-compliant 3-spatial-stream WLAN signals over 3 spatial modes of conventional 50um graded-index (GI) multimode fiber (MMF) employing non-mode-selective 3D-waveguide photonic lantern. Two kinds of scenarios, including fiber-only transmission and fiber-wireless hybrid transmission, were investigated by measuring error vector magnitude (EVM) performance for each stream and condition number (CN) of the channel matrix. The experimental results show that, SDM-based MMF link could offer a CNwireless MIMO signals over existing in-building commercially-available MMFs with enormous cost-saving.

  4. Space-division-multiplexed transmission of 3x3 multiple-input multiple-output wireless signals over conventional graded-index multimode fiber

    NARCIS (Netherlands)

    Lei, Yi; Li, Jianqiang; Fan, Yuting; Yu, Dawei; Fu, Songnian; Yin, Feifei; Dai, Yitang; Xu, Kun

    2016-01-01

    In this paper, we experimentally demonstrate space-division-multiplexed (SDM) transmission of IEEE 802.11ac-compliant 3-spatial-stream WLAN signals over 3 spatial modes of conventional 50um graded-index (GI) multimode fiber (MMF) employing non-mode-selective 3D-waveguide photonic lantern. Two kinds

  5. FADDEEV: A fortran code for the calculation of the frequency response matrix of multiple-input, multiple-output dynamic systems

    International Nuclear Information System (INIS)

    Owens, D.H.

    1972-06-01

    The KDF9/EGDON programme FADDEEV has been written to investigate a technique for the calculation of the matrix of frequency responses G(jw) describing the response of the output vector y from the multivariable differential/algebraic system S to the drive of the system input vector u. S: Ex = Ax + Bu, y = Cx, G(jw) = C(jw E - A ) -1 B. The programme uses an algorithm due to Faddeev and has been written with emphasis upon: (a) simplicity of programme structure and computational technique which should enable a user to find his way through the programme fairly easily, and hence facilitate its manipulation as a subroutine in a larger code; (b) rapid computational ability, particularly in systems with fairly large number of inputs and outputs and requiring the evaluation of the frequency responses at a large number of frequencies. Transport or time delays must be converted by the user to Pade or Bode approximations prior to input. Conditions under which the algorithm fails to give accurate results are identified, and methods for increasing the accuracy of the calculations are discussed. The conditions for accurate results using FADDEEV indicate that its application is specialized. (author)

  6. FPGA implementation of a single-input fuzzy logic controller for boost converter with the absence of an external analog-to-digital converter

    DEFF Research Database (Denmark)

    Taeed, Fazel; Salam, Z.; Ayob, S.

    2012-01-01

    converter (ADC). Instead, a simple analog-to-digital conversion scheme is implemented using the FPGA itself. Due to the simplicity of the SIFLC algorithm and the absence of an external ADC, the overall implementation requires only 408 logic elements and five input-output pins of the FPGA.......) and applied on a 50-W boost converter. The SIFLC is compared to the proportional-integral controller; the simulation and practical results indicate that SIFLC exhibits excellent performance for step load and input reference changes. Another feature of this work is the absence of an external analog-to-digital...

  7. Performance and Complexity Analysis of Blind FIR Channel Identification Algorithms Based on Deterministic Maximum Likelihood in SIMO Systems

    DEFF Research Database (Denmark)

    De Carvalho, Elisabeth; Omar, Samir; Slock, Dirk

    2013-01-01

    We analyze two algorithms that have been introduced previously for Deterministic Maximum Likelihood (DML) blind estimation of multiple FIR channels. The first one is a modification of the Iterative Quadratic ML (IQML) algorithm. IQML gives biased estimates of the channel and performs poorly at low...... to the initialization. Its asymptotic performance does not reach the DML performance though. The second strategy, called Pseudo-Quadratic ML (PQML), is naturally denoised. The denoising in PQML is furthermore more efficient than in DIQML: PQML yields the same asymptotic performance as DML, as opposed to DIQML......, but requires a consistent initialization. We furthermore compare DIQML and PQML to the strategy of alternating minimization w.r.t. symbols and channel for solving DML (AQML). An asymptotic performance analysis, a complexity evaluation and simulation results are also presented. The proposed DIQML and PQML...

  8. Steps towards a GaN nanowire based light emitting diode and its integration with Si-MOS technology

    Energy Technology Data Exchange (ETDEWEB)

    Limbach, Friederich

    2012-06-22

    This work is concerned with the realization and investigation of a light emitting diode (LED) structure within single GaN nanowires (NWs) and its integration with Si technology. To this end first a general understanding of the GaN NW growth is given. This is followed by investigations of the influence which doping species, such as Mg and Si, have on the growth of the NWs. The experience gathered in these studies set the basis for the synthesis of nominal p-i-n and n-i-p junctions in GaN NWs. Investigations of these structures resulted in the technologically important insight, that p-type doping with Mg is achieved best if it is done in the later NW growth stage. This implies that it is beneficial for a NW LED to place the p-type segment on the NW top. Another important component of an LED is the active zone where electron-hole recombination takes place. In the case of planar GaN LEDs, this is usually achieved by alloying Ga and In to form InGaN. In order to be able to control the growth under a variety of conditions, we investigate the growth of InGaN in the form of extended segments on top of GaN NWs, as well as multi quantum wells (MQWs) in GaN NWs. All the knowledge gained during these preliminary studies is harnessed to reach the overall goal: The realization of a GaN NW LED. Such structures are fabricated, investigated and processed into working LEDs. Finally, a report on the efforts of integrating III-nitride NW LEDs and Si based metaloxide-semiconductor field effect transistor (MOSFET) technology is given. This demonstrates the feasibility of the monolithic integration of both devices on the same wafer at the same time.

  9. Steps towards a GaN nanowire based light emitting diode and its integration with Si-MOS technology

    OpenAIRE

    Limbach, Friederich

    2012-01-01

    In dieser Arbeit wird die Machbarkeit der Herstellung von Leuchtdioden Strukturen (LEDs) in einzelnen GaN Nanodrähten (ND) und deren Integration mit herkömmlicher Si Technologie untersucht. Hierzu wird zunächst ein generelles Verständnis des Wachstums von GaN ND erarbeitet und dargestellt. Es folgen Untersuchungen zum Einfluss von Dotierstoffen, wie z.B. Mg und Si, auf das Wachstum der ND. Dieses Wissen wird anschließend angewandt um Dotierübergänge in GaN ND herzustellen die nominell n-i-p ...

  10. Quincuagésimo primer aniversario del Hospital Antituberculoso Santa Clara de Santafé de Bogotá

    Directory of Open Access Journals (Sweden)

    Gilberto Rueda Pérez

    1993-07-01

    Full Text Available EI Hospital Santa Clara fue fundado el 16 de julio de 1942, durante la presidencia del Dr. Eduardo Santos, a solicitud de su esposa dona Lorencita Villegas de Santos. EI hospital se construyo en esa época como sanatorio, para la atención, cuidado humano y científico de los pacientes afectados con tuberculosis. Inicialmente el hospital como con 250 camas para adultos y niños. Su nombre "Santa Clara" fue escogido en recuerdo de Clarita, hija única de los benefactores, muerta prematuramente poco tiempo antes.

  11. Launch and recovery of ROV: Investigation of operational limit from DNV Recommended Practices and time domain simulations in SIMO

    OpenAIRE

    Valen, Magnus

    2010-01-01

    Offshore contractors seek to operate their remotely operated vehicles for the widest range of sea conditions where particularly launch and recovery through splash zone are critical phases in the offshore operation. The analytical methods for calculation of operational limit proposed by guidelines from DNV Recommended Practices may lead to an over-estimation of the hydrodynamic forces and consequently to an unduly restrictive operational limit. Accurate predictions of the hydrodynamic forces a...

  12. On the Achievable Rate of Hardware-Impaired Transceiver Systems

    KAUST Repository

    Javed, Sidrah; Amin, Osama; Ikki, Salama S.; Alouini, Mohamed-Slim

    2018-01-01

    In this paper, we accurately model the transceiver hardware impairments (HWIs) of multiple-input multiple-output (MIMO) systems considering different HWI stages at transmitter and receiver. The proposed novel statistical model shows that transceiver HWIs transform the transmitted symmetric signal to asymmetric one. Moreover, it shows that the aggregate self-interference has asymmetric characteristics. Therefore, we propose improper Gaussian signaling (IGS) for transmission in order to improve the achievable rate performance. IGS is considered as a general signaling scheme which includes the proper Gaussian signaling (PGS) as a special case. Thus, IGS has additional design parameters which enable it to mitigate the HWI self-interference. As a case study, we analyze the achievable rate performance of single-input multiple-output systems with linear and selection combiner. Furthermore, we optimize the IGS statistical characteristics for interference alignment. This improves the achievable rate performance as compared to the PGS, which is validated through numerical results.

  13. On the Achievable Rate of Hardware-Impaired Transceiver Systems

    KAUST Repository

    Javed, Sidrah

    2018-01-15

    In this paper, we accurately model the transceiver hardware impairments (HWIs) of multiple-input multiple-output (MIMO) systems considering different HWI stages at transmitter and receiver. The proposed novel statistical model shows that transceiver HWIs transform the transmitted symmetric signal to asymmetric one. Moreover, it shows that the aggregate self-interference has asymmetric characteristics. Therefore, we propose improper Gaussian signaling (IGS) for transmission in order to improve the achievable rate performance. IGS is considered as a general signaling scheme which includes the proper Gaussian signaling (PGS) as a special case. Thus, IGS has additional design parameters which enable it to mitigate the HWI self-interference. As a case study, we analyze the achievable rate performance of single-input multiple-output systems with linear and selection combiner. Furthermore, we optimize the IGS statistical characteristics for interference alignment. This improves the achievable rate performance as compared to the PGS, which is validated through numerical results.

  14. An Energy Efficient Cooperative Hierarchical MIMO Clustering Scheme for Wireless Sensor Networks

    Directory of Open Access Journals (Sweden)

    Sungyoung Lee

    2011-12-01

    Full Text Available In this work, we present an energy efficient hierarchical cooperative clustering scheme for wireless sensor networks. Communication cost is a crucial factor in depleting the energy of sensor nodes. In the proposed scheme, nodes cooperate to form clusters at each level of network hierarchy ensuring maximal coverage and minimal energy expenditure with relatively uniform distribution of load within the network. Performance is enhanced by cooperative multiple-input multiple-output (MIMO communication ensuring energy efficiency for WSN deployments over large geographical areas. We test our scheme using TOSSIM and compare the proposed scheme with cooperative multiple-input multiple-output (CMIMO clustering scheme and traditional multihop Single-Input-Single-Output (SISO routing approach. Performance is evaluated on the basis of number of clusters, number of hops, energy consumption and network lifetime. Experimental results show significant energy conservation and increase in network lifetime as compared to existing schemes.

  15. Design of Robust Controllers for a Multiple Input-Multiple Output Control System with Uncertain Parameters Application to the Lateral and Longitudinal Modes of the KC-135 Transport Aircraft

    Science.gov (United States)

    1984-12-01

    input/output relationship. These are obtained from the design specifications (10:68i-684). Note that the first digit of the subscript of bkj refers...to the output and the second digit to the input. Thus, bkj is.a function of the response requirements on the output, Yk’ due to the input, r.. 169 . A...NXPMAX pNYPMAX, IPLOT) C C C* LIBARY OF PLOT SUBR(OUTINES PSNTCT NLIEPRINTER ONLY~ C* C C C SUP’ LPLOTS C C C DIMENSION IXY(101,71)918UF(100) COMMON /HOPY

  16. Phase noise effects in synchronized wireless networks for mimo-ofdm

    International Nuclear Information System (INIS)

    Kiyani, M.K.

    2014-01-01

    Channel impairments effects are evaluated by inclusion of phase noise in a synchronization error correction algorithm for MIMO (Multiple Input Multiple Output) OFDM (Orthogonal Frequency Division Multiplexing) systems. The original synchronization error correction algorithm applicable to AWGN (Additive White Gaussian Noise) channel pertaining to SISO (Single Input Single Output) system is modified in the presence of SUI (Stanford University Interim) channel models and then applied to MIMO systems. Then the performance of this modified algorithm is verified through simulations under the effects of channel impairments. (author)

  17. Printed MIMO antenna engineering

    CERN Document Server

    Sharawi, Mohammad S

    2014-01-01

    Wireless communications has made a huge leap during the past two decades. The multiple-input-multiple-output (MIMO) technology was proposed in the 1990's as a viable solution that can overcome the data rate limit experienced by single-input-single-output (SISO) systems. This resource is focused on printed MIMO antenna system design. Printed antennas are widely used in mobile and handheld terminals due to their conformity with the device, low cost, good integration within the device elements and mechanical parts, as well as ease of fabrication.A perfect design companion for practicing engineers

  18. Supplementary High-Input Impedance Voltage-Mode Universal Biquadratic Filter Using DVCCs

    Directory of Open Access Journals (Sweden)

    Jitendra Mohan

    2012-01-01

    Full Text Available To further extend the existing knowledge on voltage-mode universal biquadratic filter, in this paper, a new biquadratic filter circuit with single input and multiple outputs is proposed, employing three differential voltage current conveyors (DVCCs, three resistors, and two grounded capacitors. The proposed circuit realizes all the standard filter functions, that is, high-pass, band-pass, low-pass, notch, and all-pass filters simultaneously. The circuit enjoys the feature of high-input impedance, orthogonal control of resonance angular frequency (o, and quality factor (Q via grounded resistor and the use of grounded capacitors which is ideal for IC implementation.

  19. Reflektuojančio būsimo specialiojo pedagogo profesinio apsisprendimo patirtys = Experiences of professional self-determination by reflective intended special pedagogue

    OpenAIRE

    Bubnys, Remigijus; Žydžiūnaitė, Vilma

    2008-01-01

    The results of phenomenological hermeneutics have revealed the factors influencing professional self-determination of intended special pedagogues. Students' choice to study is determined by human oriented and self-realisation factors: need to care about others, love for children, wish to help people, get knowledge and need to overtake professional role. Decision not to become a special pedagogue is intensified by a complicated nature of work, lack of personal skills and individual peculiariti...

  20. La historia sacra del Santísimo Sacramento contra las heregias destos tiempos"An iconographic study of the engravings illustrating the work

    Directory of Open Access Journals (Sweden)

    Calvo Portela, Juan Isaac

    2014-01-01

    Full Text Available En este artículo se hace un estudio iconográfico de las dos estampas que ilustran el libro del dominico fray Alonso de Ribera, La Historia Sacra del Santissimo Sacramento contra las heregias destos tiempos, editado por Luis Sánchez en Madrid en 1626. En dichas estampas se plasman dos aspectos que van a ser fundamentales de la religiosidad contrarreformista española del siglo XVII, la defensa a ultranza de la Eucaristía y la lucha contra la herejía. In this article is made an iconographic study of the two prints that illustrate the book of the Dominican Fray Alonso de Ribera, La Historia Sacra del Santissimo Sacramento contra las heregias destos tiempos, edited by Luis Sanchez in Madrid in 1626. In these prints are reflected two aspects that are going to be essential on the religiosity Spanish Counterreform of the seventeenth century, the stubborn defense of the Eucharist and the fight against heresy.

  1. Ameerika ja Nõukogude Liidu kunstivahetus sulaajal: uhketest avamistest rutakate taandumisteni = Soviet-American art exchanges during the thaw: from bold openings to hasty retreats / Simo Mikkonen

    Index Scriptorium Estoniae

    Mikkonen, Simo, 1978-

    2013-01-01

    Nõukogude Liidu valmidusest kultuurivahetuseks, vahetuste iseloomust ja nendega kaasnenud piirangutest. Ameerika ja Nõukogude kunstiprofessionaalide koostööst vahetusprojektide korraldamisel ning nende tegutsemisvabaduse määrast poliitilise surve all. Alfred Barri rollist näitustevahetuse elluviimisel.

  2. Andres Raid : "Pööbel jääb pööbliks!" / Andres Raid ; interv. Simo Meinert

    Index Scriptorium Estoniae

    Raid, Andres

    2007-01-01

    Telereporter räägib Vene telekanali NTV Mir korrespondentide Eestis viibimisest pronkssõduriga seotud sündmuste ajal, sündmuste kajastamisest, nende arvamustest Eesti-Vene suhete kohta. Vt. samas: Miks pronkssõdur teisaldati varem, kui oli lubatud; Lausvale vene telekanalites

  3. Entrevista a Iñaki Rivera Beiras. “La Universidad tiene que jugar un papel importantísimo en la cárcel”

    Directory of Open Access Journals (Sweden)

    Afilo Revista Digital - Universidad Nacional de Córdoba

    2012-09-01

    Full Text Available Considerado uno de los más destacados especialistas a nivel internacional de la criminología “garantista”, este argentino-catalán es también uno de esos tipos que incomoda al poder. Siempre. Esté donde esté. Desde la academia, en su puesto de profesor titular de ejecución penal y derecho penitenciario en la universidad de Barcelona, o desde la acción, a través del Observatorio de Derechos Humanos que en 2001 ayudó a crear con el objetivo de abordar el complejo mundo penitenciario. Hipercrítico de la situación argentina y mundial por sus fracasadas políticas de encierro indiscriminado y violación sistemática de los derechos humanos de los presos, Iñaki Rivera Beiras en entrevista con Alfilo habla de todo lo que sucede adentro y afuera de la institución insigne del sistema penal: la cárcel.

  4. On the distinguishability and observer design for single-input single-output continuous-time switched affine systems under bounded disturbances with application to chaos-based modulation

    Czech Academy of Sciences Publication Activity Database

    Gómez-Gutiérrez, D.; Renato Vázquez, C.; Čelikovský, Sergej; Ramírez-Trevino, A.; Castillo-Toledo, B.

    2017-01-01

    Roč. 34, č. 1 (2017), s. 49-58 ISSN 0947-3580 R&D Projects: GA ČR GA13-20433S Institutional support: RVO:67985556 Keywords : Unknown input observers * Chaos-based modulation * Chaotic synchronization * Message-embedding Subject RIV: BC - Control System s Theory OBOR OECD: Automation and control system s Impact factor: 1.944, year: 2016 http://library.utia.cas.cz/separaty/2017/TR/celikovsky-0471410.pdf

  5. Propagation channel characterization, parameter estimation, and modeling for wireless communications

    CERN Document Server

    Yin, Xuefeng

    2016-01-01

    Thoroughly covering channel characteristics and parameters, this book provides the knowledge needed to design various wireless systems, such as cellular communication systems, RFID and ad hoc wireless communication systems. It gives a detailed introduction to aspects of channels before presenting the novel estimation and modelling techniques which can be used to achieve accurate models. To systematically guide readers through the topic, the book is organised in three distinct parts. The first part covers the fundamentals of the characterization of propagation channels, including the conventional single-input single-output (SISO) propagation channel characterization as well as its extension to multiple-input multiple-output (MIMO) cases. Part two focuses on channel measurements and channel data post-processing. Wideband channel measurements are introduced, including the equipment, technology and advantages and disadvantages of different data acquisition schemes. The channel parameter estimation methods are ...

  6. Iterative MMSE Detection for MIMO/BLAST DS-CDMA Systems in Frequency Selective Fading Channels - Achieving High Performance in Fully Loaded Systems

    Science.gov (United States)

    Silva, João Carlos; Souto, Nuno; Cercas, Francisco; Dinis, Rui

    A MMSE (Minimum Mean Square Error) DS-CDMA (Direct Sequence-Code Division Multiple Access) receiver coupled with a low-complexity iterative interference suppression algorithm was devised for a MIMO/BLAST (Multiple Input, Multiple Output / Bell Laboratories Layered Space Time) system in order to improve system performance, considering frequency selective fading channels. The scheme is compared against the simple MMSE receiver, for both QPSK and 16QAM modulations, under SISO (Single Input, Single Output) and MIMO systems, the latter with 2Tx by 2Rx and 4Tx by 4Rx (MIMO order 2 and 4 respectively) antennas. To assess its performance in an existing system, the uncoded UMTS HSDPA (High Speed Downlink Packet Access) standard was considered.

  7. Modelling and controlling hydropower plants

    CERN Document Server

    Munoz-Hernandez, German Ardul; Jones, Dewi Ieuan

    2013-01-01

    Hydroelectric power stations are a major source of electricity around the world; understanding their dynamics is crucial to achieving good performance.  Modelling and Controlling Hydropower Plants discusses practical and well-documented cases of modelling and controlling hydropower station modelling and control, focussing on a pumped storage scheme based in Dinorwig, North Wales.  Single-input-single-output and multiple-input-multiple-output models, which cover the linear and nonlinear characteristics of pump-storage hydroelectric power stations, are reviewed. The most important dynamic features are discussed, and the verification of these models by hardware in the loop simulation is described. To show how the performance of a pump-storage hydroelectric power station can be improved, classical and modern controllers are applied to simulated models of the Dinorwig power plant. These include PID, fuzzy approximation, feed-forward and model-based predictive control with linear and hybrid prediction models. Mod...

  8. Stress wave communication in concrete: I. Characterization of a smart aggregate based concrete channel

    International Nuclear Information System (INIS)

    Siu, Sam; Wu, Wenhao; Zhi Ding; Ji, Qing; Song, Gangbing

    2014-01-01

    In this paper, we explore the characteristics of a concrete block as a communication medium with piezoelectric transducers. Lead zirconate titanate (PZT) is a piezoceramic material used in smart materials intended for structural health monitoring (SHM). Additionally, a PZT based smart aggregate (SA) is capable of implementing stress wave communications which is utilized for investigating the properties of an SA based concrete channel. Our experiments characterize single-input single-output and multiple-input multiple-output (MIMO) concrete channels in order to determine the potential capacity limits of SAs for stress wave communication. We first provide estimates and validate the concrete channel response. Followed by a theoretical upper bound for data rate capacity of our two channels, demonstrating a near-twofold increase in channel capacity by utilizing multiple transceivers to form an MIMO system. Our channel modeling techniques and results are also helpful to researchers using SAs with regards to SHM, energy harvesting and stress wave communications. (paper)

  9. MMSE-NP-RISIC-Based Channel Equalization for MIMO-SC-FDE Troposcatter Communication Systems

    Directory of Open Access Journals (Sweden)

    Zedong Xie

    2016-01-01

    Full Text Available The impact of intersymbol interference (ISI on single-carrier frequency-domain equalization with multiple input multiple output (MIMO-SC-FDE troposcatter communication systems is severe. Most of the channel equalization methods fail to solve it completely. In this paper, given the disadvantages of the noise-predictive (NP MMSE-based and the residual intersymbol interference cancellation (RISIC equalization in the single input single output (SISO system, we focus on the combination of both equalization schemes mentioned above. After extending both of them into MIMO system for the first time, we introduce a novel MMSE-NP-RISIC equalization method for MIMO-SC-FDE troposcatter communication systems. Analysis and simulation results validate the performance of the proposed method in time-varying frequency-selective troposcatter channel at an acceptable computational complexity cost.

  10. Efficient Multichannel NLMS Implementation for Acoustic Echo Cancellation

    Directory of Open Access Journals (Sweden)

    Schüldt Christian

    2007-01-01

    Full Text Available An acoustic echo cancellation structure with a single loudspeaker and multiple microphones is, from a system identification perspective, generally modelled as a single-input multiple-output system. Such a system thus implies specific echo-path models (adaptive filter for every loudspeaker to microphone path. Due to the often large dimensionality of the filters, which is required to model rooms with standard reverberation time, the adaptation process can be computationally demanding. This paper presents a selective updating normalized least mean square (NLMS-based method which reduces complexity to nearly half in practical situations, while showing superior convergence speed performance as compared to conventional complexity reduction schemes. Moreover, the method concentrates the filter adaptation to the filter which is most misadjusted, which is a typically desired feature.

  11. Efficient Multichannel NLMS Implementation for Acoustic Echo Cancellation

    Directory of Open Access Journals (Sweden)

    Fredric Lindstrom

    2007-02-01

    Full Text Available An acoustic echo cancellation structure with a single loudspeaker and multiple microphones is, from a system identification perspective, generally modelled as a single-input multiple-output system. Such a system thus implies specific echo-path models (adaptive filter for every loudspeaker to microphone path. Due to the often large dimensionality of the filters, which is required to model rooms with standard reverberation time, the adaptation process can be computationally demanding. This paper presents a selective updating normalized least mean square (NLMS-based method which reduces complexity to nearly half in practical situations, while showing superior convergence speed performance as compared to conventional complexity reduction schemes. Moreover, the method concentrates the filter adaptation to the filter which is most misadjusted, which is a typically desired feature.

  12. Low-cost extrapolation method for maximal LTE radio base station exposure estimation: test and validation.

    Science.gov (United States)

    Verloock, Leen; Joseph, Wout; Gati, Azeddine; Varsier, Nadège; Flach, Björn; Wiart, Joe; Martens, Luc

    2013-06-01

    An experimental validation of a low-cost method for extrapolation and estimation of the maximal electromagnetic-field exposure from long-term evolution (LTE) radio base station installations are presented. No knowledge on downlink band occupation or service characteristics is required for the low-cost method. The method is applicable in situ. It only requires a basic spectrum analyser with appropriate field probes without the need of expensive dedicated LTE decoders. The method is validated both in laboratory and in situ, for a single-input single-output antenna LTE system and a 2×2 multiple-input multiple-output system, with low deviations in comparison with signals measured using dedicated LTE decoders.

  13. Low-cost extrapolation method for maximal lte radio base station exposure estimation: Test and validation

    International Nuclear Information System (INIS)

    Verloock, L.; Joseph, W.; Gati, A.; Varsier, N.; Flach, B.; Wiart, J.; Martens, L.

    2013-01-01

    An experimental validation of a low-cost method for extrapolation and estimation of the maximal electromagnetic-field exposure from long-term evolution (LTE) radio base station installations are presented. No knowledge on down-link band occupation or service characteristics is required for the low-cost method. The method is applicable in situ. It only requires a basic spectrum analyser with appropriate field probes without the need of expensive dedicated LTE decoders. The method is validated both in laboratory and in situ, for a single-input single-output antenna LTE system and a 2x2 multiple-input multiple-output system, with low deviations in comparison with signals measured using dedicated LTE decoders. (authors)

  14. Nota Editorial: Memorandum sobre la campaña antituberculosa en el departamento de Cundinamarca: Para el Excelentísimo Sr. Presidente de la República Dr. Eduardo Santos

    Directory of Open Access Journals (Sweden)

    Jorge E. Cavelier

    1938-08-01

    3- Un Pabellón de incurables, destinado a aquellos enfermos cuya posibilidad de reposición es muy remota, pero que no pueden ser abandonados en su desgracia y para quienes de una manera imperiosa se hace precisa la protección del Estado.

  15. Los efectos jurídicos del fallo del Excelentísimo Tribunal Constitucional sobre la llamada “píldora del día después”

    OpenAIRE

    Ángela Vivanco M.

    2008-01-01

    El tema de la llamada “píldora del día después” o “píldora del día siguiente” se inició en Chile con una serie de acciones ante los tribunales ordinarios con resultados muy contradictorios, tras lo cual el fallo del Tribunal Constitucional de abril de 2008 resultó una importante definición acerca del estatuto del embrión humano, la protección de la vida y el principio precautorio aplicado a ella, aunque no pudo extenderse a todas las materias relacionadas con la PDD por ser la competencia del...

  16. Disturbance estimation and compensation for planar motors on the long-stroke stage of a wafer stage

    Directory of Open Access Journals (Sweden)

    Bizhong Xia

    2015-04-01

    Full Text Available This article presents a data-based method to estimate and compensate low-frequency disturbance in planar motors on the long-stroke stage of a wafer stage, which is a typical multiple-input multiple-output system. First, a data-based method is introduced to decouple the multiple-input multiple-output system into multi-single-input single-output system, which is crucial for the design of controller and the correction of disturbance estimation in the scanning direction. Second, dominant low-frequency disturbances in the long-stroke stage are analyzed. Third, estimation and compensation method under moving condition is proposed. The compensation method is based on three feedforward tables, and the tables are indexed by trajectory parameters, including velocity and position instead of time in the iterative learning control method. Finally, experiments are performed on the long-stroke stage of a wafer stage to verify the proposed method. Experimental results show that the proposed method can effectively improve the servo performance by reducing the tracking errors by nearly 1/2 in the forward direction and 1/3 in the backward direction and lowering error difference between the forward and backward directions from 5.1 to 1.2 µm.

  17. Synthesis of a novel adaptive wavelet optimized neural cascaded steam blow-off control system for a nuclear power plant

    International Nuclear Information System (INIS)

    Malik, A.H.; Memon, A.A.; Arshad, F.

    2013-01-01

    Blow-Off System Controller (MIMO AWNN-SBOSC) is designed based on real time dynamic parametric plant data of steam blow-off system with conventional Single-Input Multi-Output Proportional plus Integral plus Derivative Controller (SIMO PIDC). The proposed MIMO AWANN-SBOSC is designed using three Multi-Input Single-Output Adaptive Wavelet Neural Network based Steam Blow-Off System Controllers (MISO AWNN-SBOSC). The hidden layer of each MISO AWNN-SBOSC is formulated using Mother Wavelet Transforms (MWT). Using nonlinear dynamic neural data of designed MIMO AWNN-SBOSC, a Multi-Input Multi-Output Adaptive Wavelet Neural Network based Steam Blow-Off System Model (MIMO AWNN-SBOSM) is developed in cascaded mode. MIMO AWNN-SBOSM is designed using two MISO AWNN-SBOSM. All training, testing and validation of MIMO AWNN-SBOSC and MIMO AWNN-SBOSM are carried out in MA TLAB while all simulation experiments are performed in Visual C. The results of the new design is evaluated against conventional controller based measured data and found robust, fast and much better in performance. (author)

  18. Optimized scheduling technique of null subcarriers for peak power control in 3GPP LTE downlink.

    Science.gov (United States)

    Cho, Soobum; Park, Sang Kyu

    2014-01-01

    Orthogonal frequency division multiple access (OFDMA) is a key multiple access technique for the long term evolution (LTE) downlink. However, high peak-to-average power ratio (PAPR) can cause the degradation of power efficiency. The well-known PAPR reduction technique, dummy sequence insertion (DSI), can be a realistic solution because of its structural simplicity. However, the large usage of subcarriers for the dummy sequences may decrease the transmitted data rate in the DSI scheme. In this paper, a novel DSI scheme is applied to the LTE system. Firstly, we obtain the null subcarriers in single-input single-output (SISO) and multiple-input multiple-output (MIMO) systems, respectively; then, optimized dummy sequences are inserted into the obtained null subcarrier. Simulation results show that Walsh-Hadamard transform (WHT) sequence is the best for the dummy sequence and the ratio of 16 to 20 for the WHT and randomly generated sequences has the maximum PAPR reduction performance. The number of near optimal iteration is derived to prevent exhausted iterations. It is also shown that there is no bit error rate (BER) degradation with the proposed technique in LTE downlink system.

  19. An intelligent 1:2 demultiplexer as an intracellular theranostic device based on DNA/Ag cluster-gated nanovehicles

    Science.gov (United States)

    Ran, Xiang; Wang, Zhenzhen; Ju, Enguo; Pu, Fang; Song, Yanqiu; Ren, Jinsong; Qu, Xiaogang

    2018-02-01

    The logic device demultiplexer can convey a single input signal into one of multiple output channels. The choice of the output channel is controlled by a selector. Several molecules and biomolecules have been used to mimic the function of a demultiplexer. However, the practical application of logic devices still remains a big challenge. Herein, we design and construct an intelligent 1:2 demultiplexer as a theranostic device based on azobenzene (azo)-modified and DNA/Ag cluster-gated nanovehicles. The configuration of azo and the conformation of the DNA ensemble can be regulated by light irradiation and pH, respectively. The demultiplexer which uses light as the input and acid as the selector can emit red fluorescence or a release drug under different conditions. Depending on different cells, the intelligent logic device can select the mode of cellular imaging in healthy cells or tumor therapy in tumor cells. The study incorporates the logic gate with the theranostic device, paving the way for tangible applications of logic gates in the future.

  20. Control of Canadian once-through direct cycle supercritical water-cooled reactors

    International Nuclear Information System (INIS)

    Sun, Peiwei; Wang, Baosheng; Zhang, Jianmin; Su, Guanghui

    2015-01-01

    Highlights: • Dynamic characteristics of Canadian SCWR are analyzed. • Hybrid feedforward and feedback control is adopted to deal with cross-coupling. • Gain scheduling control with smooth weight is applied to deal with nonlinearity. • It demonstrates through simulation that the control requirements are satisfied. - Abstract: Canadian supercritical water-cooled reactor (SCWR) can be modelled as a Multiple-input Multiple-output (MIMO) system. It has a high power-to-flow ratio, strong cross-coupling and high degree of nonlinearity in its dynamic characteristics. Among the outputs, the steam temperature is strongly affected by the reactor power and the most challenging to control. It is difficult to adopt a traditional control system design methodology to obtain a control system with satisfactory performance. In this paper, feedforward control is applied to reduce the effect on steam temperature from the reactor power. Single-input Single-output (SISO) feedback controllers are synthesized in the frequency domain. Using the feedforward controller, the steam temperature variation due to disturbances at the reactor power has been significantly suppressed. The control system can effectively maintain the overall system stability and regulate the plant around a specified operating condition. To deal with the nonlinearities, gain scheduling control strategy is adopted. Different sets of controllers combined by smooth weight functions are used for the plant at different load conditions. The proposed control strategies have been evaluated under various operating scenarios. Simulation results show that satisfactory performance can successfully achieved by the designed control system

  1. A cross-layer resource allocation scheme for spatial multiplexing-based MIMO-OFDMA systems

    Directory of Open Access Journals (Sweden)

    Al-Shatri Hussein

    2011-01-01

    Full Text Available Abstract We investigate the resource allocation problem for the downlink of a multiple-input multiple-output orthogonal frequency division multiple access (MIMO-OFDMA system. The sum rate maximization itself cannot cope with fairness among users. Hence, we address this problem in the context of the utility-based resource allocation presented in earlier papers. This resource allocation method allows to enhance the efficiency and guarantee fairness among users by exploiting multiuser diversity, frequency diversity, as well as time diversity. In this paper, we treat the overall utility as the quality of service indicator and design utility functions with respect to the average transmission rate in order to simultaneously provide two services, real-time and best-effort. Since the optimal solutions are extremely computationally complex to obtain, we propose a suboptimal joint subchannel and power control algorithm that converges very fast and simplifies the MIMO resource allocation problem into a single-input single-output resource allocation problem. Simulation results indicate that using the proposed method achieves near-optimum solutions, and the available resources are distributed more fairly among users.

  2. A Triply Selective MIMO Channel Simulator Using GPUs

    Directory of Open Access Journals (Sweden)

    R. Carrasco-Alvarez

    2018-01-01

    Full Text Available A methodology for implementing a triply selective multiple-input multiple-output (MIMO simulator based on graphics processing units (GPUs is presented. The resulting simulator is based on the implementation of multiple double-selective single-input single-output (SISO channel generators, where the multiple inputs and the multiple received signals have been transformed in order to supply the corresponding space correlation of the channel under consideration. A direct consequence of this approach is the flexibility provided, which allows different propagation statistics to each SISO channel to be specified and thus more complex environments to be replicated. It is shown that under some specific constraints, the statistics of the triply selective MIMO simulator are the same as those reported in the state of art. Simulation results show the computational time improvement achieved, up to 650-fold for an 8 × 8 MIMO channel simulator when compared with sequential implementations. In addition to the computational improvement, the proposed simulator offers flexibility for testing a variety of scenarios in vehicle-to-vehicle (V2V and vehicle-to-infrastructure (V2I systems.

  3. Multi-Satellite MIMO Communications at Ku-Band and Above: Investigations on Spatial Multiplexing for Capacity Improvement and Selection Diversity for Interference Mitigation

    Directory of Open Access Journals (Sweden)

    Liolis Konstantinos P

    2007-01-01

    Full Text Available This paper investigates the applicability of multiple-input multiple-output (MIMO technology to satellite communications at the Ku-band and above. After introducing the possible diversity sources to form a MIMO matrix channel in a satellite environment, particular emphasis is put on satellite diversity. Two specific different topics from the field of MIMO technology applications to satellite communications at these frequencies are further analyzed: (i capacity improvement achieved by MIMO spatial multiplexing systems and (ii interference mitigation achieved by MIMO diversity systems employing receive antenna selection. In the first case, a single-user capacity analysis of a satellite MIMO spatial multiplexing system is presented and a useful analytical closed form expression is derived for the outage capacity achieved. In the second case, a satellite MIMO diversity system with receive antenna selection is considered, adjacent satellite cochannel interference on its forward link is studied and an analytical model predicting the interference mitigation achieved is presented. In both cases, an appropriate physical MIMO channel model is assumed which takes into account the propagation phenomena related to the frequencies of interest, such as clear line-of-sight operation, high antenna directivity, the effect of rain fading, and the slant path lengths difference. Useful numerical results obtained through the analytical expressions derived are presented to compare the performance of multi-satellite MIMO systems to relevant single-input single-output (SISO ones.

  4. Applications of an alternative formulation for one-layer real time optimization

    Directory of Open Access Journals (Sweden)

    Schiavon Júnior A.L.

    2000-01-01

    Full Text Available This paper presents two applications of an alternative formulation for one-layer real time structure for control and optimization. This new formulation have arisen from predictive controller QDMC (Quadratic Dynamic Matrix Control, a type of predictive control (Model Predictive Control - MPC. At each sampling time, the values of the outputs of process are fed into the optimization-control structure which supplies the new values of the manipulated variables already considering the best conditions of process. The variables of optimization are both set-point changes and control actions. The future stationary outputs and the future stationary control actions have both a different formulation of conventional one-layer structure and they are calculated from the inverse gain matrix of the process. This alternative formulation generates a convex problem, which can be solved by less sophisticated optimization algorithms. Linear and nonlinear economic objective functions were considered. The proposed approach was applied to two linear models, one SISO (single-input/single output and the other MIMO (multiple-input/multiple-output. The results showed an excellent performance.

  5. MIMO Underwater Acoustic Communications in Ports and Shallow Waters at Very High Frequency

    Directory of Open Access Journals (Sweden)

    Gaultier Real

    2013-10-01

    Full Text Available Hermes is a Single-Input Single-Output (SISO underwater acoustic modem that achieves very high-bit rate digital communications in ports and shallow waters. Here, the authors study the capability of Hermes to support Multiple-Input-Multiple-Output (MIMO technology. A least-square channel estimation algorithm is used to evaluate multiple MIMO channel impulse responses at the receiver end. A deconvolution routine is used to separate the messages coming from different sources. This paper covers the performance of both the channel estimation and the MIMO deconvolution processes using either simulated data or field data. The MIMO equalization performance is measured by comparing three relative root mean-squared errors (RMSE, obtained by calculations between the source signal (a pseudo-noise sequence and the corresponding received MIMO signal at various stages of the deconvolution process; prior to any interference removal, at the output of the Linear Equalization (LE process and at the output of an interference cancellation process with complete a priori knowledge of the transmitted signal. Using the simulated data, the RMSE using LE is −20.5 dB (where 0 dB corresponds to 100% of relative error while the lower bound value is −33.4 dB. Using experimental data, the LE performance is −3.3 dB and the lower bound RMSE value is −27 dB.

  6. Efficient Closed-Loop Schemes for MIMO-OFDM-Based WLANs

    Directory of Open Access Journals (Sweden)

    Jiang Yi

    2006-01-01

    Full Text Available The single-input single-output (SISO orthogonal frequency-division multiplexing (OFDM systems for wireless local area networks (WLAN defined by the IEEE 802.11a standard can support data rates up to 54 Mbps. In this paper, we consider deploying two transmit and two receive antennas to increase the data rate up to 108 Mbps. Applying our recent multiple-input multiple-output (MIMO transceiver designs, that is, the geometric mean decomposition (GMD and the uniform channel decomposition (UCD schemes, we propose simple and efficient closed-loop MIMO-OFDM designs for much improved performance, compared to the standard singular value decomposition (SVD based schemes as well as the open-loop V-BLAST (vertical Bell Labs layered space-time based counterparts. In the explicit feedback mode, precoder feedback is needed for the proposed schemes. We show that the overhead of feedback can be made very moderate by using a vector quantization method. In the time-division duplex (TDD mode where the channel reciprocity is exploited, our schemes turn out to be robust against the mismatch between the uplink and downlink channels. The advantages of our schemes are demonstrated via extensive numerical examples.

  7. Method for traceable measurement of LTE signals

    Science.gov (United States)

    Sunder Dash, Soumya; Pythoud, Frederic; Leuchtmann, Pascal; Leuthold, Juerg

    2018-04-01

    This contribution presents a reference setup to measure the power of the cell-specific resource elements present in downlink long term evolution (LTE) signals in a way that the measurements are traceable to the international system of units. This setup can be used to calibrate the LTE code-selective field probes that are used to measure the radiation of base stations for mobile telephony. It can also be used to calibrate LTE signal generators and receivers. The method is based on traceable scope measurements performed directly at the output of a measuring antenna. It implements offline digital signal processing demodulation algorithms that consider the digital down-conversion, timing synchronization, frequency synchronization, phase synchronization and robust LTE cell identification to produce the downlink time-frequency LTE grid. Experimental results on conducted test scenarios, both single-input-single-output and multiple-input-multiple-output antenna configuration, show promising results confirming measurement uncertainties of the order of 0.05 dB with a coverage factor of 2.

  8. The Vienna LTE-advanced simulators up and downlink, link and system level simulation

    CERN Document Server

    Rupp, Markus; Taranetz, Martin

    2016-01-01

    This book introduces the Vienna Simulator Suite for 3rd-Generation Partnership Project (3GPP)-compatible Long Term Evolution-Advanced (LTE-A) simulators and presents applications to demonstrate their uses for describing, designing, and optimizing wireless cellular LTE-A networks. Part One addresses LTE and LTE-A link level techniques. As there has been high demand for the downlink (DL) simulator, it constitutes the central focus of the majority of the chapters. This part of the book reports on relevant highlights, including single-user (SU), multi-user (MU) and single-input-single-output (SISO) as well as multiple-input-multiple-output (MIMO) transmissions. Furthermore, it summarizes the optimal pilot pattern for high-speed communications as well as different synchronization issues. One chapter is devoted to experiments that show how the link level simulator can provide input to a testbed. This section also uses measurements to present and validate fundamental results on orthogonal frequency division multiple...

  9. Tropicalism and Romanticism: Francisco Mourelle de la Rúa’s Journey around the Pacific Ocean (1780-1781 Tropicalísimo y romanticismo: el viaje de Francisco Mourelle de la Rúa por el Océano Pacífico (1780-1781

    Directory of Open Access Journals (Sweden)

    José María GARCÍA SÁNCHEZ

    2011-01-01

    Full Text Available The torrid or tropical Zone limited by the two tropics of cancer and Capricorn was imagined by the greatest powers of the 18 century, Spain, France, and Great Britain as a meeting area of the otherness where the tropical discourses, ambivalent, appeared written either with dose of ferocity and infertility, or exoticism and abundance. Francisco Mourelle de la Rua was one of the most experienced sailors that plied the international waters during the last third of the eighteenth century, one of his trips included one of the «tropical» zones par excellence, the trip embarked from San Blas in Nayarit in Mexico and his return to Manila is the object of analysis of this study.La zona tórrida o tropical limitada por los dos trópicos de capricornio y de cáncer fue imaginada por las mayores potencias del siglo XVIII, España, Francia e Inglaterra, como una zona de encuentro de la otredad donde los discursos tropicalistas, ambivalentes, aparecieron escritos con dosis o bien de ferocidad e infertilidad, o bien de exotismo y abundancia. Francisco Mourelle de la Rúa fue uno de los navegantes más experimentados que surcaron las aguas internacionales durante el último tercio del siglo XViii, uno de sus viajes comprendió una de las zonas «tropicales» por excelencia, el viaje emprendido desde San Blas de nayarit en México hasta Manila y su regreso es el objeto de análisis de este estudio.

  10. Multivariate stability of force-reflecting teleoperation: Structures of finite and infinite zeros

    International Nuclear Information System (INIS)

    Daniel, R.W.; McAree, P.R.

    2000-01-01

    This paper presents a stability analysis of force-position teleoperation under general end-effector contact. The analysis is based on the finite and infinite zero structure of the multivariable root-locus resulting from modulation of the environment stiffness. The starting point is an analysis of the stability of robot force control, motivated by the observation that the human-operator in a force reflection loop acts as a force servo, generating position commands in response to reflected force. Asymptotic root loci properties are used to establish passivity conditions on force feedback to give root locus interpretations of the well-known results that (1) feedback via the inverse joint Jacobian can lead to (kinematic) instability and that (2) passivity is preserved by kinematically proper force feedback through the transpose of the joint angle Jacobian. It is demonstrated that a fully constrained force-position teleoperation loop has an identical infinite zero structure to that of a slave manipulation under kinematically proper force control and that the dominant vibration modes of a force-position loop are fully described by a multivariable analogue of the single-input single-output pseudo-system investigated in a study by Daniel and McAree. Extension of the analysis to cover partial end-effector constraint provides a design tool for teleoperation control and serves to aid selection of teleoperation slate-arms. The paper concludes by giving a passivity condition for multiple-input multiple-output force-position teleoperation for stable contact against all environments

  11. Stability and performance of propulsion control systems with distributed control architectures and failures

    Science.gov (United States)

    Belapurkar, Rohit K.

    Future aircraft engine control systems will be based on a distributed architecture, in which, the sensors and actuators will be connected to the Full Authority Digital Engine Control (FADEC) through an engine area network. Distributed engine control architecture will allow the implementation of advanced, active control techniques along with achieving weight reduction, improvement in performance and lower life cycle cost. The performance of a distributed engine control system is predominantly dependent on the performance of the communication network. Due to the serial data transmission policy, network-induced time delays and sampling jitter are introduced between the sensor/actuator nodes and the distributed FADEC. Communication network faults and transient node failures may result in data dropouts, which may not only degrade the control system performance but may even destabilize the engine control system. Three different architectures for a turbine engine control system based on a distributed framework are presented. A partially distributed control system for a turbo-shaft engine is designed based on ARINC 825 communication protocol. Stability conditions and control design methodology are developed for the proposed partially distributed turbo-shaft engine control system to guarantee the desired performance under the presence of network-induced time delay and random data loss due to transient sensor/actuator failures. A fault tolerant control design methodology is proposed to benefit from the availability of an additional system bandwidth and from the broadcast feature of the data network. It is shown that a reconfigurable fault tolerant control design can help to reduce the performance degradation in presence of node failures. A T-700 turbo-shaft engine model is used to validate the proposed control methodology based on both single input and multiple-input multiple-output control design techniques.

  12. Active structural acoustic control of helicopter interior multifrequency noise using input-output-based hybrid control

    Science.gov (United States)

    Ma, Xunjun; Lu, Yang; Wang, Fengjiao

    2017-09-01

    This paper presents the recent advances in reduction of multifrequency noise inside helicopter cabin using an active structural acoustic control system, which is based on active gearbox struts technical approach. To attenuate the multifrequency gearbox vibrations and resulting noise, a new scheme of discrete model predictive sliding mode control has been proposed based on controlled auto-regressive moving average model. Its implementation only needs input/output data, hence a broader frequency range of controlled system is modelled and the burden on the state observer design is released. Furthermore, a new iteration form of the algorithm is designed, improving the developing efficiency and run speed. To verify the algorithm's effectiveness and self-adaptability, experiments of real-time active control are performed on a newly developed helicopter model system. The helicopter model can generate gear meshing vibration/noise similar to a real helicopter with specially designed gearbox and active struts. The algorithm's control abilities are sufficiently checked by single-input single-output and multiple-input multiple-output experiments via different feedback strategies progressively: (1) control gear meshing noise through attenuating vibrations at the key points on the transmission path, (2) directly control the gear meshing noise in the cabin using the actuators. Results confirm that the active control system is practical for cancelling multifrequency helicopter interior noise, which also weakens the frequency-modulation of the tones. For many cases, the attenuations of the measured noise exceed the level of 15 dB, with maximum reduction reaching 31 dB. Also, the control process is demonstrated to be smoother and faster.

  13. Multi-carrier Communications over Time-varying Acoustic Channels

    Science.gov (United States)

    Aval, Yashar M.

    Acoustic communication is an enabling technology for many autonomous undersea systems, such as those used for ocean monitoring, offshore oil and gas industry, aquaculture, or port security. There are three main challenges in achieving reliable high-rate underwater communication: the bandwidth of acoustic channels is extremely limited, the propagation delays are long, and the Doppler distortions are more pronounced than those found in wireless radio channels. In this dissertation we focus on assessing the fundamental limitations of acoustic communication, and designing efficient signal processing methods that cam overcome these limitations. We address the fundamental question of acoustic channel capacity (achievable rate) for single-input-multi-output (SIMO) acoustic channels using a per-path Rician fading model, and focusing on two scenarios: narrowband channels where the channel statistics can be approximated as frequency- independent, and wideband channels where the nominal path loss is frequency-dependent. In each scenario, we compare several candidate power allocation techniques, and show that assigning uniform power across all frequencies for the first scenario, and assigning uniform power across a selected frequency-band for the second scenario, are the best practical choices in most cases, because the long propagation delay renders the feedback information outdated for power allocation based on the estimated channel response. We quantify our results using the channel information extracted form the 2010 Mobile Acoustic Communications Experiment (MACE'10). Next, we focus on achieving reliable high-rate communication over underwater acoustic channels. Specifically, we investigate orthogonal frequency division multiplexing (OFDM) as the state-of-the-art technique for dealing with frequency-selective multipath channels, and propose a class of methods that compensate for the time-variation of the underwater acoustic channel. These methods are based on multiple

  14. Anti-yeast potential of some Annonaceae species from ...

    African Journals Online (AJOL)

    . Taffou Taffou, Jean Baptiste Hzounda Fokou, Elisabeth Zeuko'o Menkem, Lauve Rachel Tchokouaha Yamthe, Alvine Ngoutane Mfopa, Marguerite Simo Kamdem, Vincent Ngouana, Ide Flavie Kenfack Tsague, Fabrice Fekam Boyom ...

  15. Tippmehe tagasitulek / Hannes Palang

    Index Scriptorium Estoniae

    Palang, Hannes

    2008-01-01

    Rets. rmt.: Kant. Edgar. Eesti rahvastik ja asustus / koost. ja eessõna Ott Kurs; saksa k. tlk. Simo Runnel. Ilmamaa, 2007. Vestlus Kanti vaimsest suurusest Rahvusvahelise Geograafiauniooni ekspresidendi Anne Buttimeriga, ilmunud Eesti Looduse 2004.a. detsembrinumbris

  16. Radio frequency sensing measurements and methods for location classification in wireless networks

    Science.gov (United States)

    Maas, Dustin C.

    The wireless radio channel is typically thought of as a means to move information from transmitter to receiver, but the radio channel can also be used to detect changes in the environment of the radio link. This dissertation is focused on the measurements we can make at the physical layer of wireless networks, and how we can use those measurements to obtain information about the locations of transceivers and people. The first contribution of this work is the development and testing of an open source, 802.11b sounder and receiver, which is capable of decoding packets and using them to estimate the channel impulse response (CIR) of a radio link at a fraction of the cost of traditional channel sounders. This receiver improves on previous implementations by performing optimized matched filtering on the field-programmable gate array (FPGA) of the Universal Software Radio Peripheral (USRP), allowing it to operate at full bandwidth. The second contribution of this work is an extensive experimental evaluation of a technology called location distinction, i.e., the ability to identify changes in radio transceiver position, via CIR measurements. Previous location distinction work has focused on single-input single-output (SISO) radio links. We extend this work to the context of multiple-input multiple-output (MIMO) radio links, and study system design trade-offs which affect the performance of MIMO location distinction. The third contribution of this work introduces the "exploiting radio windows" (ERW) attack, in which an attacker outside of a building surreptitiously uses the transmissions of an otherwise secure wireless network inside of the building to infer location information about people inside the building. This is possible because of the relative transparency of external walls to radio transmissions. The final contribution of this dissertation is a feasibility study for building a rapidly deployable radio tomographic (RTI) imaging system for special operations forces

  17. Towards Reliable, Scalable, and Energy Efficient Cognitive Radio Systems

    KAUST Repository

    Sboui, Lokman

    2017-11-01

    The cognitive radio (CR) concept is expected to be adopted along with many technologies to meet the requirements of the next generation of wireless and mobile systems, the 5G. Consequently, it is important to determine the performance of the CR systems with respect to these requirements. In this thesis, after briefly describing the 5G requirements, we present three main directions in which we aim to enhance the CR performance. The first direction is the reliability. We study the achievable rate of a multiple-input multiple-output (MIMO) relay-assisted CR under two scenarios; an unmanned aerial vehicle (UAV) one-way relaying (OWR) and a fixed two-way relaying (TWR). We propose special linear precoding schemes that enable the secondary user (SU) to take advantage of the primary-free channel eigenmodes. We study the SU rate sensitivity to the relay power, the relay gain, the UAV altitude, the number of antennas and the line of sight availability. The second direction is the scalability. We first study a multiple access channel (MAC) with multiple SUs scenario. We propose a particular linear precoding and SUs selection scheme maximizing their sum-rate. We show that the proposed scheme provides a significant sum-rate improvement as the number of SUs increases. Secondly, we expand our scalability study to cognitive cellular networks. We propose a low-complexity algorithm for base station activation/deactivation and dynamic spectrum management maximizing the profits of primary and secondary networks subject to green constraints. We show that our proposed algorithms achieve performance close to those obtained with the exhaustive search method. The third direction is the energy efficiency (EE). We present a novel power allocation scheme based on maximizing the EE of both single-input and single-output (SISO) and MIMO systems. We solve a non-convex problem and derive explicit expressions of the corresponding optimal power. When the instantaneous channel is not available, we

  18. Editorial: Una obra trascendental de salubridad

    Directory of Open Access Journals (Sweden)

    Facultad de Medicina Revista

    1942-06-01

    Full Text Available El 4 de junio de 1942 inauguró el Gobierno con solemnidad y sencillez republicanas el primer barrio popular modelo del Nordeste de Bogotá. Patrocinaron la ceremonia el Excelentísimo  Señor Santos, Presidente de la República y el Excelentísimo señor López, Presidente electo. Pronunció el discurso inaugural el doctor Carlos Lleras Restrepo, Ministro de Hacienda, estadista que ha ejecutado obra trascendental en la fecunda administración del Presidente Santos.

  19. JIEM's third year: Present status and future avenues

    Directory of Open Access Journals (Sweden)

    Mihaela Enache

    2011-07-01

    Full Text Available This editorial builds upon the guidelines developed by the Journal of Industrial Engineering and Management (JIEM since its inception (Sallan et al., 2010; Simo et al., 2009; Fernandez et al., 2008 and reflects some relevant information about the evolution of JIEM during 2010, together with novel features that have been implemented so far or which are planned to be realized.

  20. A fully coupled method for numerical modeling and dynamic analysis of floating vertical axis wind turbines

    DEFF Research Database (Denmark)

    Cheng, Zhengshun; Aagaard Madsen, Helge; Gao, Zhen

    2017-01-01

    •Aerodynamic modeling of floating VAWTs is established using the Actuator Cylinder (AC) flow method.•A fully coupled aero-hydro-servo-elastic simulation tool, i.e. SIMO-RIFLEX-AC, is developed for floating VAWTs.•The developedsimulation tool is verified to be accurate by a series of code-to-code ...

  1. Differentiating the Neural Response to Intervention in Children with Developmental Dyslexia

    Science.gov (United States)

    Odegard, Timothy N.; Ring, Jeremiah; Smith, Stephanie; Biggan, John; Black, Jeff

    2008-01-01

    Developmental dyslexia is associated with functional abnormalities within reading areas of the brain. For some children diagnosed with dyslexia, phonologically based remediation programs appear to rehabilitate brain function in key reading areas (Shaywitz et al., Biological Psychiatry 55: 101-110, 2004; Simos et al., Neuroscience 58: 1203-1213,…

  2. Joining and Adhesion of Advanced Inorganic Materials. Symposium Held in San Francisco, California on April 12-14, 1993. Volume 314

    Science.gov (United States)

    1993-04-14

    separation. The MaMa //S IMaSiSI and MoMoMo//SIMoSiIi B0o, a1niax, and dt0 all agree to within 3%. This indicates that a three layer slab is adequate. for...hyperthermia (deliberate elevation of body temperature) to produce beneficial effects such as killing cancerous tumors, The medical diagnostics area includes

  3. Del femicidio al feminicidio

    Directory of Open Access Journals (Sweden)

    MARCELA LAGARDE

    2006-01-01

    Full Text Available Un libro puede cambiar la vida; un concepto, una categoría, una mirada, una visión nos permiten avanzar muchísimo. En la incursión feminista en el legislativo en México, resultó muy importante pasar de pensar en femicidio a pensar en feminicidio,a pesar d

  4. Del femicidio al feminicidio

    OpenAIRE

    LAGARDE, MARCELA

    2006-01-01

    Un libro puede cambiar la vida; un concepto, una categoría, una mirada, una visión nos permiten avanzar muchísimo. En la incursión feminista en el legislativo en México, resultó muy importante pasar de pensar en femicidio a pensar en feminicidio,a pesar d

  5. A comparison of two fully coupled codes for integrated dynamic analysis of floating vertical axis wind turbines

    NARCIS (Netherlands)

    Koppenol, Boy; Cheng, Zhengshun; Gao, Zhen; Simao Ferreira, C.; Moan, T; Tande, John Olav Giæver; Kvamsdal, Trond; Muskulus, Michael

    2017-01-01

    This paper presents a comparison of two state-of-the-art codes that are capable of modelling floating vertical axis wind turbines (VAWTs) in fully coupled time-domain simulations, being the HAWC2 by DTU and the SIMO-RIFLEX-AC code by NTNU/MARINTEK. The comparative study focusses on the way

  6. Experimental Studies of CADA-Based Utility Assessment Procedures.

    Science.gov (United States)

    1981-02-01

    Trabajos de Estadistica, in press, 1981. Novick, M. R., Isaacs, G. L., Hamer, R., Chen, J., Chuang, D., Woodworth, G., Molenaar , I., Lewis, C., & Libby...Hill Book Co., Inc., 1959. Slovic, P. From Shakespeare to Simo: Spoculatie - and sm evidence - about man’s ability to process Imfotmatiea. Or&&n

  7. Association of the stramenopilan protists, the aplanochytrids, with zooplankton of the equatorial Indian Ocean

    Digital Repository Service at National Institute of Oceanography (India)

    Damare, V.; Raghukumar, S.

    , Gaxiola-Cortés MG, Simoes N (eds) Avances en Nutrición Acuícola VI. Memorias del VI Simposium Internacional de Nutrición Acuícola. 3 al 6 de Septiembre del 2002. Cancún, Quintana Roo, México, p 281-292. • Bussolati G, Leonardo E (2008) Technical...

  8. DECOFF Probabilities of Failed Operations

    DEFF Research Database (Denmark)

    Gintautas, Tomas

    2015-01-01

    A statistical procedure of estimation of Probabilities of Failed Operations is described and exemplified using ECMWF weather forecasts and SIMO output from Rotor Lift test case models. Also safety factor influence is investigated. DECOFF statistical method is benchmarked against standard Alpha-factor...

  9. Interaction of alcohols with the anhydrous silico-12-molybdic acid

    International Nuclear Information System (INIS)

    Pinchuk, I.N.; Chuvaev, V.F.; Ovchinnikova, N.S.; Zhuravlev, L.T.; Spitsyn, V.I.

    1984-01-01

    A study was made on interaction of methanol, ethanol and isopropanol with silico-12-molybdic acid (H 4 SiMo 12 O 40 (SMA). It was revealed that anhydrous SMA at room temperature adds a sufficient amount of alcohol from gaseous phase with formation of solvates of the following compositions: H 4 SiMo 12 O 40 x3CH 3 OH, H 4 SiMo 12 O 40 x5C 2 H 5 OH and H 4 SiMo 12 O 40 x3C 3 H 7 OH. Thermal decomposition of SMA solvates was studied and the mechanism of solid-phase heteropolyacid interaction with alcohols was suggested. Temperature ranges of separate catalytic and redox processes were established. Specificity of activity and peculiarities of heteropolyacid transformation in the course of reaction were investigated. It was shown that formation of deprotonated phases of SiMosub(12)Osub(38-y/2) or Csub(n)SiMosub(12)Osub(38-x) type during SMA interaction with alcohol can't be probably reduced to the simple succession of reduction and dehydration reactions

  10. Dos libros sobre Alfonso Reyes

    Directory of Open Access Journals (Sweden)

    Helcías Martán Góngora

    1962-05-01

    Full Text Available Con retardo llegó a nosotros el nobilísimo testimonio que el Instituto Iberoamericano de Gotemburgo, dedicó a don Alfonso Reyes, el ilustre escritor mexicano, con motivo de haber cumplido cincuenta años de fecundo ejercicio literario, de ejemplar unión matrimonial con los libros.

  11. Diagnostic monitoring of drivetrain in a 5 MW spar-type floating wind turbine using Hilbert spectral analysis

    DEFF Research Database (Denmark)

    Ghane, Mahdi; Nejad, Amir R.; Blanke, Mogens

    2017-01-01

    and condition monitoring approaches; using analytical tools, therefore, is one of the promising approaches in this regard. In this study, forces and moments on the main shaft are obtained from the global response analysis using an aero-hydro-servo-elastic code, SIMO-RIFLEX-AeroDyn. Then, they are utilized...

  12. Purification and concentration of uranium-bearing solutions at the plants of the Societe industrielle des minerais de l'Ouest

    International Nuclear Information System (INIS)

    Vollerin, G.

    1980-01-01

    The author describes the various processes for purification of uranium-bearing solutions used at the plants of the Societe industrielle des minerais de l'Ouest (SIMO) from their commissioning up to the present time, together with the purification circuit adopted at the two plants at present operating in Niger. (author)

  13. Eesti meesluule argipäev / Mart Velsker

    Index Scriptorium Estoniae

    Velsker, Mart, 1966-

    2004-01-01

    Rets.rmt.: Oja, Martin., keelatud raamat : tekste 1996-2000. [Tallinn] : 9 Koma, [2003] ; Ilus, Peeter. Mõned luuletused. [Tallinn : Eesti Keele Sihtasutus, 2003] ; Klaus, Eduard. Pommikutsikas : [luuletused]. Tartu : Ilmamaa, 2003 ; Mathura, pseud. Sõstramesi : luuletusi. Külaküla [p.o. Tallinn] : Erakkond, 2003 ; Runnel, Simo. Uneriik : luuletused. Tartu : Ilmamaa, 2003

  14. In-depth agglomeration of d-metals at Si-on-Mo interfaces

    NARCIS (Netherlands)

    T. Tsarfati,; Zoethout, E.; van de Kruijs, R.; F. Bijkerk,

    2009-01-01

    Reflective Si/Mo multilayer mirrors with protective d-metal surfaces onto a range of upper Mo and Si layer thicknesses have been grown with physical vapor deposition and investigated on diffusion and in-depth compound formation. Laterally inhomogeneous upward Si and downward d-metal diffusion occurs

  15. Traducción Económica, Comercial y Financiera II. Tarea 1: Análisis del contexto de especialidad

    OpenAIRE

    Vargas Sierra, Chelo

    2011-01-01

    La primera tarea está destinada a que los futuros traductores se familiaricen con algunos de los sectores del extensísimo campo de la traducción económica, financiera y comercial, al tiempo que adquieren recursos para documentarse sobre aspectos concretos, ligados a los determinados encargos de traducción que les puedan surgir.

  16. Trend on teada, või kuidas? / Tõnu Kaalep

    Index Scriptorium Estoniae

    Kaalep, Tõnu, 1966-

    1999-01-01

    Sisustusmess "Habitare'99" Helsingis. Praegune sisekujundusmood. Eestist olid messil ZiZi kodutekstiilid, Steel Line'i toodetud Tarmo Luisu lambid, kataloogi andmetel firmad Majestic ja Päikesedekoori OÜ. Noorte mööblidisainivõistluse võitsid Touko Korhonen ja Simo Puntila. Hindaja inglise disainiprofessor Ron Arad. Üks Soome Sisearhitektide Liidu kahest aastapreemiast Ben af Schultenile

  17. Educación del usuario. La pedagogía del caballo que no tiene sed

    OpenAIRE

    Valls Molins, Roser; Isla Pera, Ma. Pilar (María Pilar); López Matheu, Carme

    1995-01-01

    La educación del paciente constituye un rol importantísimo de la Enfermería, pero sólo se podrán conseguir las metas preventivas y de apoyo si la metodología empleada satisface las necesidades del cliente y está en consonancia con sus valores culturales y creencias.

  18. Eduardo Torroja

    Directory of Open Access Journals (Sweden)

    Fisac, Miguel

    1961-07-01

    Full Text Available Dentro del maremágnum actual de prisa creadora en todo: en ciencia, en técnica, en arte, son escasísimos los nombres de los hombres que son, en algo de esto, un punto fijo a donde nos podemos agarrar; del que podemos partir con seguridad.

  19. Bloque de viviendas. Madrid

    Directory of Open Access Journals (Sweden)

    Lamela, Antonio

    1960-04-01

    Full Text Available Se trata de la edificación de dos parcelas colindantes formando un conjunto de composición exenta en la Avenida del Generalísimo de Madrid, avenida que puede y que debía haber sido una de las mejores vías de la capital de España.

  20. The delay in the development of experimental colitis from isomaltosyloligosaccharides in rats is dependent on the degree of polymerization.

    Directory of Open Access Journals (Sweden)

    Hitoshi Iwaya

    Full Text Available Isomaltosyloligosaccharides (IMO and dextran (Dex are hardly digestible in the small intestine and thus influence the luminal environment and affect the maintenance of health. There is wide variation in the degree of polymerization (DP in Dex and IMO (short-sized IMO, S-IMO; long-sized IMO, L-IMO, and the physiological influence of these compounds may be dependent on their DP.Five-week-old male Wistar rats were given a semi-purified diet with or without 30 g/kg diet of the S-IMO (DP = 3.3, L-IMO (DP = 8.4, or Dex (DP = 1230 for two weeks. Dextran sulfate sodium (DSS was administered to the rats for one week to induce experimental colitis. We evaluated the clinical symptoms during the DSS treatment period by scoring the body weight loss, stool consistency, and rectal bleeding. The development of colitis induced by DSS was delayed in the rats fed S-IMO and Dex diets. The DSS treatment promoted an accumulation of neutrophils in the colonic mucosa in the rats fed the control, S-IMO, and L-IMO diets, as assessed by a measurement of myeloperoxidase (MPO activity. In contrast, no increase in MPO activity was observed in the Dex-diet-fed rats even with DSS treatment. Immune cell populations in peripheral blood were also modified by the DP of ingested saccharides. Dietary S-IMO increased the concentration of n-butyric acid in the cecal contents and the levels of glucagon-like peptide-2 in the colonic mucosa.Our study provided evidence that the physiological effects of α-glucosaccharides on colitis depend on their DP, linkage type, and digestibility.

  1. Theory and calculus of cubical complexes

    Science.gov (United States)

    Perlman, M.

    1973-01-01

    Combination switching networks with multiple outputs may be represented by Boolean functions. Report has been prepared which describes derivation and use of extraction algorithm that may be adapted to simplification of such simultaneous Boolean functions.

  2. Efficient linear precoding for massive MIMO systems using truncated polynomial expansion

    KAUST Repository

    Mü ller, Axel; Kammoun, Abla; Bjö rnson, Emil; Debbah, Mé roú ane

    2014-01-01

    Massive multiple-input multiple-output (MIMO) techniques have been proposed as a solution to satisfy many requirements of next generation cellular systems. One downside of massive MIMO is the increased complexity of computing the precoding

  3. Multiple relay selection for delay-limited applications

    KAUST Repository

    Alsharoa, Ahmad M.; Abediseid, Walid; Alouini, Mohamed-Slim

    2013-01-01

    A multiple relay selection system model that implements the decode-and-forward mode is investigated. All communication nodes are assumed to be equipped by multiple antennas. Furthermore, lattices space-time coded multiple-input multiple-output half

  4. Low Complexity Parameter Estimation For Off-the-Grid Targets

    KAUST Repository

    Jardak, Seifallah; Ahmed, Sajid; Alouini, Mohamed-Slim

    2015-01-01

    In multiple-input multiple-output radar, to estimate the reflection coefficient, spatial location, and Doppler shift of a target, a derived cost function is usually evaluated and optimized over a grid of points. The performance of such algorithms

  5. Low complexity joint estimation of reflection coefficient, spatial location, and Doppler shift for MIMO-radar by exploiting 2D-FFT

    KAUST Repository

    Jardak, Seifallah; Ahmed, Sajid; Alouini, Mohamed-Slim

    2014-01-01

    In multiple-input multiple-output (MIMO) radar, to estimate the reflection coefficient, spatial location, and Doppler shift of a target, maximum-likelihood (ML) estimation yields the best performance. For this problem, the ML estimation requires

  6. Precoding Design of MIMO Amplify-and-Forward Communication System With an Energy Harvesting Relay and Possibly Imperfect CSI

    KAUST Repository

    Benkhelifa, Fatma; Alouini, Mohamed-Slim

    2017-01-01

    In this paper, we investigate the simultaneous wireless information and power transfer (SWIPT) in a Multiple-Input Multiple-Output (MIMO) Amplify-and-Forward (AF) relay communication system where the relay is an energy harvesting (EH) node

  7. On the performance of spectrum sharing systems with multiple antennas

    KAUST Repository

    Yang, Liang; Alouini, Mohamed-Slim; Qaraqe, Khalid A.

    2012-01-01

    In this paper, we study the capacity of spectrum sharing (SS) multiple-input multiple-output (MIMO) systems over Rayleigh fading channels. More specifically, we present closed-form capacity formulas for such systems with and without optimal power

  8. Capacity analysis of spectrum sharing spatial multiplexing MIMO systems

    KAUST Repository

    Yang, Liang; Qaraqe, Khalid A.; Serpedin, Erchin; Alouini, Mohamed-Slim

    2014-01-01

    This paper considers a spectrum sharing (SS) multiple-input multiple-output (MIMO) system operating in a Rayleigh fading environment. First the capacity of a single-user SS spatial multiplexing system is investigated in two scenarios that assume

  9. A Novel Mirror-Aided Non-imaging Receiver for Indoor 2x2 MIMO Visible Light Communication Systems

    KAUST Repository

    Park, Kihong; Oubei, Hassan M.; Alheadary, Wael Ghazy; Ooi, Boon S.; Alouini, Mohamed-Slim

    2017-01-01

    Indoor visible light communication (VLC) systems are now possible because of advances in light emitting diode and laser diode technologies. These lighting technologies provide the foundation for multiple-input multiple-output (MIMO) data

  10. Relay Precoder Optimization in MIMO-Relay Networks With Imperfect CSI

    KAUST Repository

    Pandarakkottilil, Ubaidulla; Chockalingam, A.

    2011-01-01

    In this paper, we consider robust joint designs of relay precoder and destination receive filters in a nonregenerative multiple-input multiple-output (MIMO) relay network. The network consists of multiple source-destination node pairs assisted by a

  11. Alternate transmission with half-duplex relaying in MIMO interference relay networks

    KAUST Repository

    Park, Seongho; Ko, Youngchai; Park, Kihong; Alouini, Mohamed-Slim

    2013-01-01

    In this paper, we consider an alternate transmission scheme for a multiple-input multiple-output interference relay channel where multiple sources transmit their own signals to their corresponding destinations via one of two relaying groups

  12. Acoustic MIMO signal processing

    CERN Document Server

    Huang, Yiteng; Chen, Jingdong

    2006-01-01

    A timely and important book addressing a variety of acoustic signal processing problems under multiple-input multiple-output (MIMO) scenarios. It uniquely investigates these problems within a unified framework offering a novel and penetrating analysis.

  13. A Generalized Spatial Correlation Model for 3D MIMO Channels based on the Fourier Coefficients of Power Spectrums

    KAUST Repository

    Nadeem, Qurrat-Ul-Ain; Kammoun, Abla; Debbah, Merouane; Alouini, Mohamed-Slim

    2015-01-01

    Previous studies have confirmed the adverse impact of fading correlation on the mutual information (MI) of two-dimensional (2D) multiple-input multiple-output (MIMO) systems. More recently, the trend is to enhance the system performance

  14. Generation of correlated finite alphabet waveforms using gaussian random variables

    KAUST Repository

    Jardak, Seifallah; Ahmed, Sajid; Alouini, Mohamed-Slim

    2014-01-01

    , the proposed scheme is general, the main focus of this paper is to generate finite alphabet waveforms for multiple-input multiple-output radar, where correlated waveforms are used to achieve desired beampatterns. © 2014 IEEE.

  15. SWIPT in Multiuser MIMO Decode-and-Forward Relay Broadcasting Channel with Energy Harvesting Relays

    KAUST Repository

    Benkhelifa, Fatma; Salem, Ahmed Sultan; Alouini, Mohamed-Slim

    2017-01-01

    In this paper, we consider a multiuser multiple- input multiple-output (MIMO) decode-and-forward (DF) relay broadcasting channel (BC) with single source, multiple energy harvesting relays and multiple destinations. Since the end-to-end sum rate

  16. A SDP based design of relay precoding for the power minimization of MIMO AF-relay networks

    KAUST Repository

    Rao, Anlei; Park, Kihong; Alouini, Mohamed-Slim

    2015-01-01

    Relay precoding for multiple-input and multiple-output (MIMO) relay networks has been approached by either optimizing the efficiency performance with given power consumption constraints or minimizing the power consumption with quality-of-service (Qo

  17. On Secure Underlay MIMO Cognitive Radio Networks with Energy Harvesting and Transmit Antenna Selection

    KAUST Repository

    Lei, Hongjiang; Xu, Ming; Ansari, Imran Shafique; Pan, Gaofeng; Qaraqe, Khalid A.; Alouini, Mohamed-Slim

    2017-01-01

    In this paper, we consider an underlay multipleinput- multiple-output (MIMO) cognitive radio network (CRN) including a pair of primary nodes, a couple of secondary nodes, and an eavesdropper, where the secondary transmitter is powered

  18. Performance Analysis of a Power Limited Spectrum Sharing System with TAS/MRC

    KAUST Repository

    Khan, Fahd Ahmed; Tourki, Kamel; Alouini, Mohamed-Slim; Qaraqe, Khalid A.

    2014-01-01

    multiple antennas on the secondary network terminals and performing antenna selection. In this paper, the performance of a multiple-input multiple-output (MIMO) secondary link with transmit antenna selection (TAS) at the transmitter and maximum ratio

  19. 3D Massive MIMO Systems: Channel Modeling and Performance Analysis

    KAUST Repository

    Nadeem, Qurrat-Ul-Ain

    2015-01-01

    Multiple-input-multiple-output (MIMO) systems of current LTE releases are capable of adaptation in the azimuth only. More recently, the trend is to enhance the system performance by exploiting the channel's degrees of freedom in the elevation

  20. A novel mirror diversity receiver for indoor MIMO visible light

    KAUST Repository

    Park, Ki-Hong; Alheadary, Wael G.; Alouini, Mohamed-Slim

    2016-01-01

    In this paper, we propose and study a non-imaging receiver design reducing the correlation of channel matrix for indoor multiple-input multiple-output (MIMO) visible light communication (VLC) systems. Contrary to previous works, our proposed mirror

  1. Multiple-Zone Diffractive Optic Element for Laser Ranging Applications

    Science.gov (United States)

    Ramos-Izquierdo, Luis A.

    2011-01-01

    A diffractive optic element (DOE) can be used as a beam splitter to generate multiple laser beams from a single input laser beam. This technology has been recently used in LRO s Lunar Orbiter Laser Altimeter (LOLA) instrument to generate five laser beams that measure the lunar topography from a 50-km nominal mapping orbit (see figure). An extension of this approach is to use a multiple-zone DOE to allow a laser altimeter instrument to operate over a wider range of distances. In particular, a multiple-zone DOE could be used for applications that require both mapping and landing on a planetary body. In this case, the laser altimeter operating range would need to extend from several hundred kilometers down to a few meters. The innovator was recently involved in an investigation how to modify the LOLA instrument for the OSIRIS asteroid mapping and sample return mission. One approach is to replace the DOE in the LOLA laser beam expander assembly with a multiple-zone DOE that would allow for the simultaneous illumination of the asteroid with mapping and landing laser beams. The proposed OSIRIS multiple-zone DOE would generate the same LOLA five-beam output pattern for high-altitude topographic mapping, but would simultaneously generate a wide divergence angle beam using a small portion of the total laser energy for the approach and landing portion of the mission. Only a few percent of the total laser energy is required for approach and landing operations as the return signal increases as the inverse square of the ranging height. A wide divergence beam could be implemented by making the center of the DOE a diffractive or refractive negative lens. The beam energy and beam divergence characteristics of a multiple-zone DOE could be easily tailored to meet the requirements of other missions that require laser ranging data. Current single-zone DOE lithographic manufacturing techniques could also be used to fabricate a multiple-zone DOE by masking the different DOE zones during

  2. Adaptive trailing edge flaps for active load alleviation in a smart rotor configuration

    Energy Technology Data Exchange (ETDEWEB)

    Bergami, L.

    2013-08-15

    algorithm features a linear quadratic regulator with periodic disturbance rejection, and controls the deflection of the flap on each blade based on measurements of the root flapwise bending moment; each blade is considered as an independent Single Input-Single Output system. The second algorithm is a Multiple Input-Multiple Output Model Predictive Control (MIMO-MPC), which monitors the whole turbine response, and controls all the available actuators: ATEF, individual blade pitch, and generator. Both algorithms include frequency-dependent weighting of the control actions in order to limit high frequency control activity, and thus effectively reduce actuators use and wear. The smart rotor performances are evaluated from HAWC2 simulations reproducing the response to standard turbulent wind fields. Both algorithms reduce the lifetime fatigue damage on the blade root flapwise bending moment by 15 % using the ATEF actuators. Whereas, by combining pitch and flap actions, the MIMO-MPC reports alleviation results close to 30 %. The MIMO-MPC requires lower flap activity, and also achieves higher reductions of the tower fatigue loads, thus indicating that a combined control approach that coordinates and integrates all available sensors and actuators has the potential for overall better results than achieved by a series of independent control systems. (Author)

  3. Material and technique of S i-Mo heatresistant vermicular iron exhaust manifold

    Directory of Open Access Journals (Sweden)

    Jin Yong-xi

    2006-08-01

    Full Text Available Si-Mo vermicular iron is an ideal material for exhaust manifold that works in high temperature and therm alcycle conditions because its properties oftherm alfatigue resistance and thermal distortion resistance are significantly better than that of gray cast iron and nodular iron. This paper explains that the verm icularity of Si-Mo verm icular iron is better to be controlled approxim ately to 50% for the applications of exhaust manifold castings, and generalizes the successful experience ofverm icularizing technique thatuses sandwich(pouroverprocess combining with cored-wire injection in trough process together,and uses rare earths-magnesium-silicon as verm icularizing alloy in Disa high speed molding line and autom atic plug rod airpressure pouring furnace. In addition, this paper also describes the method to solve the shrinkage hole and porosity defects in the exhaustm anifold production.

  4. La administración de la seguridad

    Directory of Open Access Journals (Sweden)

    María Claudia Peralta Gómez

    1988-04-01

    Full Text Available RESUMEN Este escrito pretende hacer énfasis en la importancia de asumir actitudes frente a la seguridad industrial. Se llama la atención acerca de la  historia, las causas de estos accidentes, los altísimos costos y sobretodo  en cómo hacer partícipes  a los trabajadores de la pequeña empresa en programas que les proporcionan mayor seguridad industrial

  5. Application of Fuzzy Algorithm in Optimizing Hierarchical Sliding Mode Control for Pendubot System

    Directory of Open Access Journals (Sweden)

    Xuan Dung Huynh

    2017-12-01

    Full Text Available Pendubot is a classical under-actuated SIMO model for control algorithm testing in laboratory of universities. In this paper, authors design a fuzzy-sliding control for this system. The controller is designed from a new idea of application of fuzzy algorithm for optioning control parameters. The response of system on TOP position under fuzzysliding control algorithm is proved to be better than under sliding controller through Matlab/Simulink simulation.

  6. El reflejo de la lectura de Monterroso en El Hombre Duplicado

    Directory of Open Access Journals (Sweden)

    Raquel López Ruano

    2014-01-01

    Full Text Available En la novela El hombre duplicado , Saramago intertextualiza el brevísimo relato de El dinosaurio de Augusto Monterroso y hace una peculiar interpretación del mismo. La genialidad de Saramago consiste en desplegar una doble complicidad, hacia Monterroso y hacia el lector. El hombre duplic ado admite varios niveles de lectura y puede llegar a distintos tipos de lectores porque en esta obra se entrecruzan continuamente lo culto y lo popular del pensamiento y del lenguaje.

  7. Interaction of silico-12-molybdic acid with acetone

    International Nuclear Information System (INIS)

    Chuvaev, V.F.; Pinchuk, I.N.; Gubin, V.V.

    1984-01-01

    Methods of thermal analysis, mass-spectrometry, IR, PMR, ESR spectroscopy are used to investigate interaction processes of silico-12-molybdic acid H 4 SiMo 12 O 40 with acetone. Reactions in solution and with participation of solid heteropolyacid are studied. Organic products of catalytic and oxidation-reduction reactions are identified. The effect of conditions on the formation of different condensation and oxidation products and the sequence of appropriate reactions is discussed. Transformations of silico-12-molybolic acid are considered

  8. ANALISIS STRATEGI PENGEMBANGAN SEKTOR PERTANIAN SUB SEKTOR BAHAN PANGAN DI KABUPATEN BOYOLALI

    Directory of Open Access Journals (Sweden)

    Muhammad Zaenuri

    2017-06-01

    Full Text Available Permasalahan yang dikaji dalam penelitian ini adalah 1. Komoditas tanaman bahan makanan unggulan apa saja yang ada di masing-masing kecamatan di Kabupaten Boyolali, 2 Bagaimana strategi perencanaan pengembangan subsektor tanaman bahan makanan dilihat dari kelengkapan infrastruktur di Kabupaten Boyolali, 3 Bagaimana laju pertumbuhan sektor tanaman bahan makanan yang dimiliki tiap kecamatan di Kabupaten Boyolali. Data yang digunakan adalah data sekunder. Metode analisis data menggunakan analisis Location Quotient (LQ, Shift Share (SS, Klassen Typologi. Berdasarkan hasil penelitian dengan menggunakan analisis Location Quotient (LQ diketahui pengembangan komoditas padi terdapat di Kecamatan Ngemplak, Kecamatan Banyudono, Kecamatan Sawit. Komoditas tanaman jagung terdapat di Kecamatan Selo, Kecamatan Ampel, Kecamatan Cepogo dan Kecamatan Musuk. Komoditas ubi kayu di Kecamatan Klego, kecamatan Simo. Komoditas ubi jalar di Kecamatan Selo, Kecamatan Simo dan Kecamatan Mojosongo. Komoditas kacang tanah ada di Kecamatan Boyolali dan Kecamatan Nogosari. Komoditas kedelai di Kecamatan Juwangi, Kecamatan Sambi, Kecamatn Kemusu dan Kecamatan Wonosegoro. The problems that were in this research is 1 Commodities food plants seed material what it was in each carpel kecamatan in kabupaten boyolali, 2 how strategy sub planning the development of the food crops sector seen from the completeness of the infrastructure in boyolali district, 3 how sector growth rate of plants of food material possessed every sub-district in boyolali district. The data used was secondary data. Data analysis methods using analysis loqation quotient (LQ, shift share (SS, klassen typologi . According to the research using analysis loqation quotient (LQ development rice is in in ngemplak, in banyudono, in palm. Corn is crops in district violoncello, in ampel, in cepogo and in musuk. Commodities cassava in district klego, in simo. Commodities sweet potatoes in in violoncello, in simo and

  9. Exploitation de la non-circularité pour les transmissions et l'écoute passive

    OpenAIRE

    Sadok , Mustapha

    2017-01-01

    This thesis is devoted to exploit the non-circularity and non-gaussianity properties of signals of interest (SOI) and/or interference for wireless transmissions and passive listening. In the first part of this thesis, we are interested in the extension of conventional SIMO-MLSE receivers to new architectures exploiting the potential second order non-circularity of co-channel interference (CCI), for the demodulation of rectilinear signals (BPSK, ASK), quasi-rectilinear (MSK, GMSK and OQAM) and...

  10. A modified phase-fitted and amplification-fitted Runge-Kutta-Nyström method for the numerical solution of the radial Schrödinger equation

    OpenAIRE

    Papadopoulos , D. F.; Anastassi , Z. A.; Simos , T. E.

    2010-01-01

    Abstract A new Runge-Kutta-Nystrom method, with phase-lag and amplification error of order infinity, for the numerical solution of the Schrodinger equation is developed in this paper. The new method is based on the Runge-Kutta-Nystrom method with fourth algebraic order, developed by Dormand, El-Mikkawy and Prince. Numerical illustrations indicate that the new method is much more efficient than other methods derived for the same purpose. phone: +30-210-9421510 (Simos, T. E.) ...

  11. Effect of Aluminum Alloying on the Hot Deformation Behavior of Nano-bainite Bearing Steel

    Science.gov (United States)

    Yang, Z. N.; Dai, L. Q.; Chu, C. H.; Zhang, F. C.; Wang, L. W.; Xiao, A. P.

    2017-12-01

    Interest in using aluminum in nano-bainite steel, especially for high-carbon bearing steel, is gradually growing. In this study, GCr15SiMo and GCr15SiMoAl steels are introduced to investigate the effect of Al alloying on the hot deformation behavior of bearing steel. Results show that the addition of Al not only notably increases the flow stress of steel due to the strong strengthening effect of Al on austenite phase, but also accelerates the strain-softening rates for its increasing effect on stacking fault energy. Al alloying also increases the activation energy of deformation. Two constitutive equations with an accuracy of higher than 0.99 are proposed. The constructed processing maps show the expanded instability regions for GCr15SiMoAl steel as compared with GCr15SiMo steel. This finding is consistent with the occurrence of cracking on the GCr15SiMoAl specimens, revealing that Al alloying reduces the high-temperature plasticity of the bearing steel. On the contrary, GCr15SiMoAl steel possesses smaller grain size than GCr15SiMo steel, manifesting the positive effect of Al on bearing steel. Attention should be focused on the hot working process of bearing steel with Al.

  12. Molecular characterization and genetic diversity analysis β-glucan content variability in grain of oat (Avena sativa L.

    Directory of Open Access Journals (Sweden)

    Đukić Nevena H.

    2014-01-01

    Full Text Available In grain of ten genetically divergent oat cultivars (Merkur, Minor Abed, Flaming-Kurz, Nuptiele, Prode, Pellerva, Emperor, Astor, Osmo, Simo the variability β-glucan content were investigated. The different value of content of β-glucan was found. Among analyzed oat cultivars, the highest β- glucan contents had Pellerva (6.597%, while the least had Simo (2.971%. The contents of β-glucans were determined by ICC standard Method No 168. The value of β-glucans varied and indicated the differences and similarities between analysed cultivars. The degree of cultivar similarity was determined by dendrogram on which was discriminated two clusters of similar cultivars toward to contents of β-glucan . Within cluster 1, a small group of oats, are five cultivars with small distance (Merkur, Minor Abed, Flamings-Kurz, Nuptiele and Prode. The highest similarity in the range of 88 or the least distance in the range of 12. Within cluster 2 was four oat cultivars (Emperor, Astor, Osmo, Pellerva in which the least differences was between Emperor and Astor with average distance in range 27. Cluster 1 and cluster 2 differed with an average distance of 63. The cultivar Simo expressed the greatest distance to all analysed oat cultivars grouped in two clusters. [Projekat Ministarstva nauke Republike Srbije, br. TR 31092

  13. Anodic photodissolution of n-InP, under electroless conditions

    International Nuclear Information System (INIS)

    Debiemme-Chouvy, Catherine; Quennoy, Anne

    2004-01-01

    In the presence of α-SiMo 12 O 40 4- ions dissolved in acidic solution and under laser irradiation, the electroless photoetching of n-type InP is achieved. At the laser impact, the semiconductor is oxidized while SiMo 12 O 40 4- species are reduced. The shape of the pit formed, due to the photoanodic dissolution of the material, depends on the experimental conditions, notably on the presence or not of Cl - ions in the medium. It can have either a Gaussian shape or a flat bottom. To specify the charge transfer which occurs at the n-InP/solution illuminated interface, some electrochemical studies were performed on n- and p-type InP electrodes. In fact, the reduction of SiMo 12 O 40 4- ions occurs by capture of electrons from the InP conduction band. Considering the energetic situation at the InP/electrolyte interface and some electrochemical results, it is concluded that the electron transfer from InP to SiMo 12 is mediated by surface states. The influence of Cl - ions on the n-InP photodissolution process is also discussed

  14. Analysis of the Noise Characteristics of CMOS Current Conveyors

    DEFF Research Database (Denmark)

    Bruun, Erik

    1997-01-01

    The definition of the current conveyor is reviewed and a multiple-output second generation current conveyor (CCII) is shown to combine the different generations of current conveyors presently existing. Next, noise sources are introduced, and a general noise model for the current conveyor is descr......The definition of the current conveyor is reviewed and a multiple-output second generation current conveyor (CCII) is shown to combine the different generations of current conveyors presently existing. Next, noise sources are introduced, and a general noise model for the current conveyor...

  15. The Effects of Cognitive Jamming on Wireless Sensor Networks Used for Geolocation

    Science.gov (United States)

    2012-03-01

    continuously sends out random bits to the channel without following any MAC-layer etiquette [31]. Normally, the underlying MAC protocol allows...23 UDP User Datagram Protocol . . . . . . . . . . . . . . . . . . . 30 MIMO Multiple Input Multiple Output . . . . . . . . . . . . . . . 70...information is packaged and distributed on the network layer, only the physical measurements are considered. This protocol is used to detect faulty nodes

  16. On the performance of diagonal lattice space-time codes

    KAUST Repository

    Abediseid, Walid; Alouini, Mohamed-Slim

    2013-01-01

    There has been tremendous work done on designing space-time codes for the quasi-static multiple-input multiple output (MIMO) channel. All the coding design up-to-date focuses on either high-performance, high rates, low complexity encoding

  17. Using multi-criteria analysis of simulation models to understand complex biological systems

    Science.gov (United States)

    Maureen C. Kennedy; E. David. Ford

    2011-01-01

    Scientists frequently use computer-simulation models to help solve complex biological problems. Typically, such models are highly integrated, they produce multiple outputs, and standard methods of model analysis are ill suited for evaluating them. We show how multi-criteria optimization with Pareto optimality allows for model outputs to be compared to multiple system...

  18. Mutual coupling investigation between a loop and two inverted-l antennas operating below 1 GHz

    DEFF Research Database (Denmark)

    Bahramzy, Pevand; Svendsen, Simon; Pedersen, Gert F.

    2015-01-01

    To overcome antenna design challenges posed by the increasing number of frequency bands, the use of separate transmit (Tx) and receive (Rx) narrow-band antennas is proposed. In addition, a second Rx antenna is utilised for multiple input-multiple output (MIMO) application. While sufficiently low ...

  19. A multiband dual-standard MIMO antenna system based on monopoles (4G) and connected slots (5G) for future smart phones

    KAUST Repository

    Ikram, M.; Sharawi, M. S.; Shamim, Atif; Sebak, A.

    2018-01-01

    In this work, a 4G/5G multiple-input multiple-output (MIMO) antenna system is presented for smart phone applications. The 4G antenna operates from 1900 to 3212 MHz and 3517 to 3712 MHz with 1312 (69%) and 195 (5.5%) MHz measured bandwidths

  20. Joint Angle and Frequency Estimation Using Multiple-Delay Output Based on ESPRIT

    Science.gov (United States)

    Xudong, Wang

    2010-12-01

    This paper presents a novel ESPRIT algorithm-based joint angle and frequency estimation using multiple-delay output (MDJAFE). The algorithm can estimate the joint angles and frequencies, since the use of multiple output makes the estimation accuracy greatly improved when compared with a conventional algorithm. The useful behavior of the proposed algorithm is verified by simulations.

  1. Seamless Translation of Optical Fiber PolMux-OFDM into a 2x2 MIMO Wireless Transmission Enabled by Digital Training-Based Fiber-Wireless Channel Estimation

    DEFF Research Database (Denmark)

    Pang, Xiaodan; Zhao, Ying; Deng, Lei

    2011-01-01

    We propose and demonstrate a 2 × 2 multiple-input multiple-output (MIMO) wireless over fiber transmission system. Seamless translation of two orthogonal frequency division multiplexing (OFDM) signals on dual optical polarization states into wireless MIMO transmission at 795.5 Mbit/s net data rate...

  2. The application of spatial shifting for peak-to-average power ratio reduction in MIMO OFDM systems

    NARCIS (Netherlands)

    Schenk, T.C.W.; Smulders, P.F.M.; Fledderus, E.

    2006-01-01

    This paper investigates the application of spatial shifting (SS) of partial transmit sequences (PTSs) in multiple-input multiple-output OFDM. The technique rearranges the transmit (TX) vector in such a way that subparts are transmitted on those TX branches that result in the lowest overall

  3. Training sequence design for MIMO channels : An application-oriented approach

    NARCIS (Netherlands)

    Katselis, D.; Rojas, C.R.; Bengtsson, M.; Bjornson, E.; Bombois, X.; Shariati, N.; Jansson, M.; Hjalmarsson, H.

    2013-01-01

    In this paper, the problem of training optimization for estimating a multiple-input multiple-output (MIMO) flat fading channel in the presence of spatially and temporally correlated Gaussian noise is studied in an application-oriented setup. So far, the problem of MIMO channel estimation has mostly

  4. Weighted Sum-Rate Maximization Using Weighted MMSE for MIMO-BC Beamforming Design

    DEFF Research Database (Denmark)

    Christensen, Søren; De Carvalho, Elisabeth; Agarwal, Rajiv

    2009-01-01

    This paper studies linear transmit filter design for weighted sum-rate (WSR) maximization in the multiple input multiple output broadcast channel (MIMO-BC). The problem of finding the optimal transmit filter is non-convex and intractable to solve using low complexity methods. Motivated by recent ...

  5. Analysis and compensation for the joint effects of HPA nonlinearity, I/Q imbalance and crosstalk in MIMO beamforming systems

    KAUST Repository

    Qi, Jian; Aissa, Sonia

    2011-01-01

    In this paper, we investigate the joint effects of high-power amplifier (HPA) nonlinearity, in-phase/quadrature-phase (I/Q) imbalance and crosstalk, on the performance of multiple-input multiple-output (MIMO) transmit beamforming (TB) systems

  6. On the BER and capacity analysis of MIMO MRC systems with channel estimation error

    KAUST Repository

    Yang, Liang; Alouini, Mohamed-Slim

    2011-01-01

    In this paper, we investigate the effect of channel estimation error on the capacity and bit-error rate (BER) of a multiple-input multiple-output (MIMO) transmit maximal ratio transmission (MRT) and receive maximal ratio combining (MRC) systems over

  7. Rate Maximization in MIMO Decode-and-Forward Communications With an EH Relay and Possibly Imperfect CSI

    KAUST Repository

    Benkhelifa, Fatma; Salem, Ahmed Sultan; Alouini, Mohamed-Slim

    2016-01-01

    In this paper, we investigate the simultaneous wireless information and power transfer (SWIPT) in a multiple-input multiple-output (MIMO) decode-and-forward (DF) relay system where the relay is an energy harvesting (EH) multi-antenna node equipped

  8. Design considerations for a transparent mode group diversity multiplexing link

    NARCIS (Netherlands)

    Tsekrekos, C.; Martinez, A.; Huijskens, Frans; Koonen, A.M.J.

    2006-01-01

    Mode group diversity multiplexing (MGDM) is an optical multiple-input-multiple-output technique that aims at creating independent communication channels over a multimode fiber, using subsets of propagating modes. This letter deals with the analysis of an MGDM point-to-point link, transparent to the

  9. Noise Properties of CMOS Current Conveyors

    DEFF Research Database (Denmark)

    Bruun, Erik

    1996-01-01

    The definition of the current conveyor is presented and it is shown how different generations of current conveyors can all be combined into a single definition of a multiple-output second generation current conveyor (CCII). Next, noise sources are introduced into the model, and a general noise...

  10. UPS9: Hardware Manual

    International Nuclear Information System (INIS)

    Martin, F.; Sanchez, E.

    2014-01-01

    The UPS9 printed circuit board is a power pulsed supply controlled by voltage that allow multiple output modes. Isolated output pulses of up to 200 V amplitude can be generated with either positive or negative polarity from a single 24 VDC power source. This circuit was designed and optimized for driving both solenoid and piezoelectric type gas valves. (Author)

  11. Sum-rate analysis of spectrum sharing spatial multiplexing MIMO systems with zero-forcing and multiuser diversity

    KAUST Repository

    Yang, Liang; Qaraqe, Khalid A.; Serpedin, Erchin; Alouini, Mohamed-Slim

    2013-01-01

    This paper considers a multiuser spectrum sharing (SS) multiple-input multiple-output (MIMO) system with zero-forcing (ZF) operating in a Rayleigh fading environment. We provide an asymptotic sum-rate analysis to investigate the effects of different

  12. Antenna Design for Diversity and MIMO Application

    DEFF Research Database (Denmark)

    Ying, Zhinong; Chiu, Chi-Yuk; Zhao, Kun

    2015-01-01

    Recently, multiple-input multiple-output (MIMO) technology and diversity have attracted much attention both in industry and academia due to high data rate and high spectrum efficiency. By increasing the number of antennas at the transmitter and/or the receiver side of the wireless link, the diver...

  13. 61.3-Gbps hybrid fiber-wireless in-home network enabled by optical heterodyne and polarization multiplexing

    NARCIS (Netherlands)

    Cao, Z.; Li, F.; Liu, Y.; Yu, J.; Wang, Q.; Oh, C.W.; Jiao, Y.; Tran, N.C.; Boom, van den H.P.A.; Tangdiongga, E.; Koonen, A.M.J.

    2014-01-01

    A hybrid fiber-wireless in-home network is proposed to support high-speed multiple input and multiple output (MIMO) orthogonal frequency division multiplexing systems operating at millimeter wave (mm-wave) band by employing optical heterodyne (OH) and polarization multiplexing (PolMux). OH enables

  14. Digital Beam Forming and Compressive Sensing Based DOA Estimation in MIMO Arrays

    NARCIS (Netherlands)

    Belfiori, F.; Anitori, L.; Rossum, W.L. van; Otten, M.P.G.; Hoogeboom, P.

    2011-01-01

    The paper presents different processing schemes that have been investigated in order to evaluate the direction of arrival (DOA) with a multiple-input multiple-output (MIMO) radar. Conventional digital beam forming (DBF) and super resolution algorithm (MUSIC) have been applied. The results provided

  15. On the transfer matrix of a MIMO system

    DEFF Research Database (Denmark)

    Bentosela, Francois; Cornean, Horia; Fleury, Bernard Henri

    2011-01-01

    We develop a deterministic ab initio model for the input–output relationship of a multiple-input multiple-output (MIMO) wireless channel, starting from the Maxwell equations combined with Ohm's law. The main technical tools are scattering and geometric perturbation theories. The derived relations...

  16. Non-parametric identification of multivariable systems : a local rational modeling approach with application to a vibration isolation benchmark

    NARCIS (Netherlands)

    Voorhoeve, R.J.; van der Maas, A.; Oomen, T.A.J.

    2018-01-01

    Frequency response function (FRF) identification is often used as a basis for control systems design and as a starting point for subsequent parametric system identification. The aim of this paper is to develop a multiple-input multiple-output (MIMO) local parametric modeling approach for FRF

  17. A Distributed Taxation Based Rank Adaptation Scheme for 5G Small Cells

    DEFF Research Database (Denmark)

    Catania, Davide; Cattoni, Andrea Fabio; Mahmood, Nurul Huda

    2015-01-01

    The further densification of small cells impose high and undesirable levels of inter-cell interference. Multiple Input Multiple Output (MIMO) systems along with advanced receiver techniques provide us with extra degrees of freedom to combat such a problem. With such tools, rank adaptation...

  18. Nontimber Forest Products in the Rural Household Economy

    Science.gov (United States)

    Erin O. Sills; Sharachchandra Lele; Thomas P. Holmes; Subhrendu K. Pattanayak

    2003-01-01

    Among the multiple outputs of forests, the category labeled nontimber forest products, or NTFPs, has drawn increased policy and research attention during the past 20 years. NTFPs have become recognized for their importance in the livelihoods of the many relatively poor households who live in or near forests, especially in the tropics. Policy concern about NTFPs takes...

  19. Advanced relay technologies in next generation wireless communications

    CERN Document Server

    Krikidis, Ioannis

    2016-01-01

    This book details the use of the cooperative networks/relaying approach in new and emerging telecommunications technologies such as full-duplex radio, massive multiple-input multiple-output (MIMO), network coding and spatial modulation, and new application areas including visible light communications (VLC), wireless power transfer, and 5G.

  20. Overview of multi-input frequency domain modal testing methods with an emphasis on sine testing

    Science.gov (United States)

    Rost, Robert W.; Brown, David L.

    1988-01-01

    An overview of the current state of the art multiple-input, multiple-output modal testing technology is discussed. A very brief review of the current time domain methods is given. A detailed review of frequency and spatial domain methods is presented with an emphasis on sine testing.

  1. Active control of time-varying broadband noise and vibrations using a sliding-window Kalman filter

    NARCIS (Netherlands)

    van Ophem, S.; Berkhoff, Arthur P.; Sas, P.; Moens, D.; Denayer, H.

    2014-01-01

    Recently, a multiple-input/multiple-output Kalman filter technique was presented to control time-varying broadband noise and vibrations. By describing the feed-forward broadband active noise control problem in terms of a state estimation problem it was possible to achieve a faster rate of

  2. Full-duplex transmission of IEEE 802.11ac-compliant MIMO WLAN signals over a 2-km 7-core fiber

    NARCIS (Netherlands)

    Fan, Yuting; Li, Jianqiang; Lei, Yi; Tang, Ming; Yin, Feifei; Dai, Yitang; Xu, Kun

    2017-01-01

    In this Letter, we experimentally demonstrate a full-duplex transmission system of IEEE 802.11ac-compliant multiple-input multiple-output (MIMO) signals over a 2-km 7-core fiber for in-building wireless local-area network (WLAN) distributed antenna systems. For full-duplex 3 � 3 MIMO

  3. Feasibility of space-division-multiplexed transmission of IEEE 802.11 n/ac-compliant wireless MIMO signals over OM3 multimode fiber

    NARCIS (Netherlands)

    Lei, Yi; Li, Jianqiang; Meng, Ziyi; Wu, Rui; Wan, Zhiquan; Fan, Yuting; Zhang, Wenjia; Yin, Feifei; Dai, Yitang; Xu, Kun

    2018-01-01

    In this paper, we have experimentally demonstrated the feasibility of space-division-multiplexed 3 × 3 multiple-input multiple-output (MIMO) transmission over a single OM3 multimode fiber (MMF) using commercial IEEE 802.11 n/ac access points. Throughput performance for different fiber length links

  4. New insights into the stochastic ray production frontier

    Czech Academy of Sciences Publication Activity Database

    Henningsen, A.; Bělín, Matěj; Henningsen, G.

    2017-01-01

    Roč. 156, July (2017), s. 18-21 ISSN 0165-1765 R&D Projects: GA MŠk(CZ) SVV260475 Institutional support: Progres-Q24 Keywords : stochastic ray production frontier * distance function * multiple outputs Subject RIV: AH - Economics OBOR OECD: Economic Theory Impact factor: 0.558, year: 2016

  5. Phase Noise Effect on MIMO-OFDM Systems with Common and Independent Oscillators

    DEFF Research Database (Denmark)

    Chen, Xiaoming; Wang, Hua; Fan, Wei

    2018-01-01

    In this paper, the effects of oscillator phase noises (PNs) on multiple-input multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) systems are studied. It is shown that PNs of common oscillators at the transmitter and at the receiver have the same influence on the performance ...

  6. Analyzing cost efficient production behavior under economies of scope : A nonparametric methodology

    NARCIS (Netherlands)

    Cherchye, L.J.H.; de Rock, B.; Vermeulen, F.M.P.

    2008-01-01

    In designing a production model for firms that generate multiple outputs, we take as a starting point that such multioutput production refers to economies of scope, which in turn originate from joint input use and input externalities. We provide a nonparametric characterization of cost-efficient

  7. Analyzing Cost Efficient Production Behavior Under Economies of Scope : A Nonparametric Methodology

    NARCIS (Netherlands)

    Cherchye, L.J.H.; de Rock, B.; Vermeulen, F.M.P.

    2006-01-01

    In designing a production model for firms that generate multiple outputs, we take as a starting point that such multi-output production refers to economies of scope, which in turn originate from joint input use and input externalities. We provide a nonparametric characterization of cost efficient

  8. Downlink Performance of a Multi-Carrier MIMO System in a Bursty Traffic Cellular Network

    DEFF Research Database (Denmark)

    Nguyen, Hung Tuan; Kovacs, Istvan; Wang, Yuanye

    2011-01-01

    In this paper we analyse the downlink performance of a rank adaptive multiple input multiple output (MIMO) system in a busty traffic cellular network. A LTE-Advanced system with multiple component carriers was selected as a study case. To highlight the advantage of using MIMO techniques, we used ...

  9. Optimal transmit power allocation for MIMO two-way cognitive relay networks with multiple relays using AF strategy

    KAUST Repository

    Alsharoa, Ahmad M.; Ghazzai, Hakim; Alouini, Mohamed-Slim

    2014-01-01

    In this letter, we consider a multiple-input multiple-output two-way cognitive radio system under a spectrum sharing scenario, where primary and secondary users operate on the same frequency band. The secondary terminals aims to exchange different

  10. Random transmission scheme approach for a FMCW TDMA coherent MIMO radar

    NARCIS (Netherlands)

    Belfiori, F.; Rossum, W.L. van; Hoogeboom, P.

    2012-01-01

    In this paper the authors analyze the use of Time Division Multiple Access (TDMA) applied to coherent Multiple-Input Multiple-Output (MIMO) radar systems. One of the main limitations in exploiting the orthogonal condition in the time domain for MIMO radars is the reduction of the unambiguous Doppler

  11. Using correlation functions as free decays

    DEFF Research Database (Denmark)

    Brincker, Rune; Amador, Sandro; Juul, Martin

    It is a general assumption in OMA that correlation functions are free decays. In multiple input OMA this assumption also implies that any column in the correlation function matrix is to be considered as multiple output free decays. This assumption is discussed in this paper together with issues...... concerning estimation and application of correlations functions in OMA....

  12. Robust Tomlinson-Harashima precoding for non-regenerative multi-antenna relaying systems

    KAUST Repository

    Xing, Chengwen; Xia, Minghua; Gao, Feifei; Wu, Yikchung

    2012-01-01

    In this paper, we consider the robust transceiver design with Tomlinson-Harashima precoding (THP) for multi-hop amplify-and-forward (AF) multiple-input multiple-output (MIMO) relaying systems. THP is adopted at the source to mitigate the spatial

  13. Optimal multivariable control of a wind turbine with variable speed

    NARCIS (Netherlands)

    Steinbuch, M.

    1987-01-01

    The control system design for a 310 kW horizontal axis wind energy conversion system with a synchronous generator and DC link is investigated. Because the wind turbine system has multiple inputs (pitch angle, field vollage alld delay angle), and multiple outputs, (speed and power), and because the

  14. Allocation Fairness for MIMO Precoded UTRA-LTE TDD System

    DEFF Research Database (Denmark)

    Wang, Yuanye; Rahman, Muhammad Imadur; Das, Suvra

    2008-01-01

    In future Time Division Duplex (TDD)-based broadband wireless systems, it will be possible to exploit the channel reciprocity to implement Channel State Information (CSI)-based Multi User Multiple Input Multiple Output (MU-MIMO) techniques, which will ensure highly efficient spectrum usage...

  15. Economic framework for integrating environmental stewardship into ...

    African Journals Online (AJOL)

    A number of agricultural production technologies (based on natural resource management principles) exist that offer opportunities for achieving the two seemingly divergent goals because they have the characteristics to produce joint multiple outputs, i.e, they produce food and provide environmental services. However ...

  16. Optical pulse generation using fiber lasers and integrated optics

    International Nuclear Information System (INIS)

    Wilcox, R.B.; Browning, D.F.; Burkhart, S.C.; VanWonterghem, B.W.

    1995-01-01

    We have demonstrated an optical pulse forming system using fiber and integrated optics, and have designed a multiple-output system for a proposed fusion laser facility. Our approach is an advancement over previous designs for fusion lasers, and an unusual application of fiber lasers and integrated optics

  17. 2x2 MIMO-OFDM Gigabit fiber-wireless access system based on polarization division multiplexed WDM-PON

    DEFF Research Database (Denmark)

    Deng, Lei; Pang, Xiaodan; Zhao, Ying

    2012-01-01

    We propose a spectral efficient radio over wavelength division multiplexed passive optical network (WDM-PON) system by combining optical polarization division multiplexing (PDM) and wireless multiple input multiple output (MIMO) spatial multiplexing techniques. In our experiment, a training-based...

  18. On the performance of diagonal lattice space-time codes for the quasi-static MIMO channel

    KAUST Repository

    Abediseid, Walid; Alouini, Mohamed-Slim

    2013-01-01

    There has been tremendous work done on designing space-time codes for the quasi-static multiple-input multiple-output (MIMO) channel. All the coding design to date focuses on either high-performance, high rates, low complexity encoding and decoding

  19. Opening the "Black Box" of efficiency measurement : Input allocation in multi-output settings

    NARCIS (Netherlands)

    Dierynck, B.; Cherchye, L.J.H.; Sabbe, J.; Roodhooft, F.; de Rock, B.

    2013-01-01

    We develop a new data envelopment analysis (DEA)-based methodology for measuring the efficiency of decision-making units (DMUs) characterized by multiple inputs and multiple outputs. The distinguishing feature of our method is that it explicitly includes information about output-specific inputs and

  20. Dense SDM (12-Core × 3-Mode) Transmission Over 527 km With 33.2-ns Mode-Dispersion Employing Low-Complexity Parallel MIMO Frequency-Domain Equalization

    DEFF Research Database (Denmark)

    Shibahara, Kohki; Lee, Doohwan; Kobayashi, Takayuki

    2016-01-01

    We propose long-haul space-division-multiplexing (SDM) transmission systems employing parallel multiple-input multiple-output (MIMO) frequency-domain equalization (FDE) and transmission fiber with low differential mode delay (DMD). We first discuss the advantages of parallel MIMO FDE technique in...

  1. Characterization of free-standing InAs quantum membranes by standing wave hard x-ray photoemission spectroscopy

    Science.gov (United States)

    Conti, G.; Nemšák, S.; Kuo, C.-T.; Gehlmann, M.; Conlon, C.; Keqi, A.; Rattanachata, A.; Karslıoǧlu, O.; Mueller, J.; Sethian, J.; Bluhm, H.; Rault, J. E.; Rueff, J. P.; Fang, H.; Javey, A.; Fadley, C. S.

    2018-05-01

    Free-standing nanoribbons of InAs quantum membranes (QMs) transferred onto a (Si/Mo) multilayer mirror substrate are characterized by hard x-ray photoemission spectroscopy (HXPS) and by standing-wave HXPS (SW-HXPS). Information on the chemical composition and on the chemical states of the elements within the nanoribbons was obtained by HXPS and on the quantitative depth profiles by SW-HXPS. By comparing the experimental SW-HXPS rocking curves to x-ray optical calculations, the chemical depth profile of the InAs(QM) and its interfaces were quantitatively derived with ångström precision. We determined that (i) the exposure to air induced the formation of an InAsO4 layer on top of the stoichiometric InAs(QM); (ii) the top interface between the air-side InAsO4 and the InAs(QM) is not sharp, indicating that interdiffusion occurs between these two layers; (iii) the bottom interface between the InAs(QM) and the native oxide SiO2 on top of the (Si/Mo) substrate is abrupt. In addition, the valence band offset (VBO) between the InAs(QM) and the SiO2/(Si/Mo) substrate was determined by HXPS. The value of VBO = 0.2 ± 0.04 eV is in good agreement with literature results obtained by electrical characterization, giving a clear indication of the formation of a well-defined and abrupt InAs/SiO2 heterojunction. We have demonstrated that HXPS and SW-HXPS are non-destructive, powerful methods for characterizing interfaces and for providing chemical depth profiles of nanostructures, quantum membranes, and 2D layered materials.

  2. Characterization of free-standing InAs quantum membranes by standing wave hard x-ray photoemission spectroscopy

    Directory of Open Access Journals (Sweden)

    G. Conti

    2018-05-01

    Full Text Available Free-standing nanoribbons of InAs quantum membranes (QMs transferred onto a (Si/Mo multilayer mirror substrate are characterized by hard x-ray photoemission spectroscopy (HXPS and by standing-wave HXPS (SW-HXPS. Information on the chemical composition and on the chemical states of the elements within the nanoribbons was obtained by HXPS and on the quantitative depth profiles by SW-HXPS. By comparing the experimental SW-HXPS rocking curves to x-ray optical calculations, the chemical depth profile of the InAs(QM and its interfaces were quantitatively derived with ångström precision. We determined that (i the exposure to air induced the formation of an InAsO4 layer on top of the stoichiometric InAs(QM; (ii the top interface between the air-side InAsO4 and the InAs(QM is not sharp, indicating that interdiffusion occurs between these two layers; (iii the bottom interface between the InAs(QM and the native oxide SiO2 on top of the (Si/Mo substrate is abrupt. In addition, the valence band offset (VBO between the InAs(QM and the SiO2/(Si/Mo substrate was determined by HXPS. The value of VBO = 0.2 ± 0.04 eV is in good agreement with literature results obtained by electrical characterization, giving a clear indication of the formation of a well-defined and abrupt InAs/SiO2 heterojunction. We have demonstrated that HXPS and SW-HXPS are non-destructive, powerful methods for characterizing interfaces and for providing chemical depth profiles of nanostructures, quantum membranes, and 2D layered materials.

  3. A geometrically exact beam element based on the absolute nodal coordinate formulation

    International Nuclear Information System (INIS)

    Gerstmayr, Johannes; Matikainen, Marko K.; Mikkola, Aki M.

    2008-01-01

    In this study, Reissner's classical nonlinear rod formulation, as implemented by Simo and Vu-Quoc by means of the large rotation vector approach, is implemented into the framework of the absolute nodal coordinate formulation. The implementation is accomplished in the planar case accounting for coupled axial, bending, and shear deformation. By employing the virtual work of elastic forces similarly to Simo and Vu-Quoc in the absolute nodal coordinate formulation, the numerical results of the formulation are identical to those of the large rotation vector formulation. It is noteworthy, however, that the material definition in the absolute nodal coordinate formulation can differ from the material definition used in Reissner's beam formulation. Based on an analytical eigenvalue analysis, it turns out that the high frequencies of cross section deformation modes in the absolute nodal coordinate formulation are only slightly higher than frequencies of common shear modes, which are present in the classical large rotation vector formulation of Simo and Vu-Quoc, as well. Thus, previous claims that the absolute nodal coordinate formulation is inefficient or would lead to ill-conditioned finite element matrices, as compared to classical approaches, could be refuted. In the introduced beam element, locking is prevented by means of reduced integration of certain parts of the elastic forces. Several classical large deformation static and dynamic examples as well as an eigenvalue analysis document the equivalence of classical nonlinear rod theories and the absolute nodal coordinate formulation for the case of appropriate material definitions. The results also agree highly with those computed in commercial finite element codes

  4. Historia urbana e historia obrera: reflexiones sobre la vida obrera y su inscripción en el espacio urbano, 1900-1950

    OpenAIRE

    Oyón Bañales, José Luis

    2002-01-01

    El artículo examina algunas cuestiones básicas de relación entre clase obrera y espacio urbano. El espacio urbano y la vida cotidiana en la ciudad, especialmente en la gran ciudad europea de la primera mitad del siglo XX, no fueron elementos pasivos en el proceso de formación de la clase obrera. Desde la Primera Guerra Mundial sobre todo, vida obrera y espacio urbano experimentaron un giro importantísimo. Se consolidaron nuevos suburbios donde las clases trabajadoras se segregaron en mayor me...

  5. Diseño y construcción de un banco de pruebas térmicos para discos de freno

    OpenAIRE

    Orellana Villavicencio, Alex Eduardo; Songor Songor, José Alberto

    2007-01-01

    La seguridad de las personas sin duda alguna debe ser el objetivo principal que debe primar en cualquier diseño, siendo los vehículos las máquinas más usadas por las personas, los sistemas que conforman los vehículos deben cumplir y ser diseñados para brindar la mayor seguridad posible. Por tanto el presente trabajo de investigación ha desarrollado el estudio y el análisis del comportamiento de un importantísimo sistema del vehículo como lo es el sistema de frenos centrando su estudio prin...

  6. Recuerdo de Sartre en el centenario de su nacimiento Remember Sartre in his birthday centenary

    OpenAIRE

    Francisco Fernández Buey

    2007-01-01

    El texto busca trazar un breve painel del trayecto intelectual y político del gran pensador francés J. P. Sartre (1905-1980) en el año de su centenario. Del existencialismo, pasando por su adhesión al marxismo y a su intenso activismo, Sastre dejó un testamento político-cultural importantísimo. Seguro ningún otro filósofo representó mejor que él los anhelos y esperanzas del intelectual europeo del siglo XX, comprometido con la causa de la libertad. Palabras-clave:

  7. Superando barreras a base de ingenio

    OpenAIRE

    Núñez Valdés, Juan; Rodríguez Arévalo, María Luisa

    2012-01-01

    No hay la menor duda de que la mujer ha estado siempre muy discriminada con respecto al varón en el papel a desempeñar en todas las civilizaciones que se han desarrollado a lo largo de la historia, no comenzando a tener derechos iguales hasta hace relativamente muy poco tiempo, mucho menos de un siglo, y no habiéndose alcanzado esta igualdad todavía, ni muchísimo menos, en todos los países. En esta comunicación, además de poner de manifiesto este hecho, centrado sobre todo en l...

  8. ALUMNO: Flores Gómez Elena Beatriz Psycometric properties of the Modified Tonic Inmobility Scale

    OpenAIRE

    Bados, Arturo; Peró, Maribel

    2018-01-01

    La Escala de Inmovilidad Tónica ha sido estudiada sólo en víc-timas de abusos y/o agresiones sexuales, pero la inmovilidad tónica (IT) puede darse ante otros eventos traumáticos. En consecuencia, nos propu-simos modificar la escala con este fin y estudiar su estructura factorial y otras propiedades psicométricas (consistencia interna y validez convergente, divergente y discriminante) en 392 universitarios, la mayoría de los cuales había padecido uno o más eventos traumáticos de distintos tipo...

  9. Aproximación al concepto de los derechos humanos

    OpenAIRE

    Velasco Arroyo, Juan Carlos

    1990-01-01

    Los derechos humanos han alcanzado un amplísimo reconocimiento jurídico en cuanto base normativa tanto de los actuales sistemas democráticos como de los múltiples organismos que articulan unas relaciones internacionales cada vez más intensas. En dicha noción normativa no se incluyen, sin embargo, tan sólo aspectos jurídico-formales. En su concepto se dan cita diversos atributos formales (universalidad de su adscripción, carácter absoluto e inalienabilidad, entre otras notas ...

  10. Territorio, pobreza y vida en el estado de Puebla

    Directory of Open Access Journals (Sweden)

    Elsa Patiño Tovar

    2003-01-01

    Full Text Available La estrategia económica global debe repensarse en términos de eliminar al conjunto de deudas externas y al establecimiento de intercambios más equitativos entre norte y sur, que pongan el punto final a este larguísimo proceso de coloniaje que hemos vivido y que tantas secuelas negativas ha tenido para la humanidad. Generar empleos con salarios decentes, es un reto al que no se ha podido responder porque el mundo está funcionando dentro de la lógica de una división internacional del trabajo, que privilegia la ley del más fuerte.

  11. Polémico retrato de un revolucionario latinoamericano

    Directory of Open Access Journals (Sweden)

    Moira Cristiá

    2009-03-01

    Full Text Available El rostro del joven barbudo de boina, ícono actual de lo latinoamericano y de edulcoradas rebeldías, fue el objeto del último proyecto cinematográfico de Steven Soderbergh. Una pregunta propia, que reitera los murmullos del cuadragésimo aniversario de su muerte en 2007, impulsa el film: ¿Qué hubo detrás de esta imagen enigmática? De esta manera, su obra convocó a masas de espectadores de diferentes países a un viaje histórico en el que se sumaron rasgos a aquel personaje mitificado. Sin la i...

  12. Tähed disainiöös / Mait Summatavet, Risto Räägel, Per Mollerup...[jt.] ; interv. Karin Paulus

    Index Scriptorium Estoniae

    2007-01-01

    Disainiöö raames avati Arhitektuuri- ja Disainigaleriis näitus "Kokkupandavad asjad" ning kuulutati välja konkursi võitjad. Peapreemia võitis läti disaineri Elina Bushmane kokkupandav teelaud, teise koha Jaana Päeva tekstiilist kott, kolmanda koha Ingrem Floreni käekott. Ära märgiti Veiko Liisi kilepiima vutlar. Disainiöö üritustest ning konkursitöödest räägivad Mait Summatavet, Per Mollerup, Simo Heikkilä, Risto Räägel

  13. La proyección de la crisis en España

    OpenAIRE

    Antonio Torrero Mañas

    2009-01-01

    El mundo, y también España, se enfrenta a la corrección de un ciclo extraordinariamente expansivo del crédito, que ha tenido lugar en un entorno de riesgo creciente y de relajación reguladora, con innovaciones financieras importantes, y un papel destacadísimo de los mercados financieros, de los productos derivados y de los bancos de inversión. En la fase expansiva del ciclo, la abundancia de recursos y la gran liquidez de los mercados ha impulsado el crecimiento económico en un marco financie...

  14. Los recetarios “afrancesados” del siglo XIX en México.

    OpenAIRE

    Corona, Sarah Bak-Geller

    2009-01-01

    Algunos de los primeros libros de cocina mexicanos fueron publicados en la década de 1830 por imprentas francesas especializadas en libros en español. Este artículo analiza los distintos modelos culinarios y de nación presentes en dos recetarios afrancesados -el Arte novísimo de cocina y el Nuevo cocinero americano/mexicano en forma de diccionario- ysu relación con el contexto decimonónico de construcción de la nación mexicana. The first Mexican recipe books were published in the early 183...

  15. Los recetarios “afrancesados” del siglo XIX en México. French-fashioned Mexican recipe books in the 19th century. Globalization and construction of a national culinary model

    OpenAIRE

    Sarah Bak-Geller Corona

    2009-01-01

    Algunos de los primeros libros de cocina mexicanos fueron publicados en la década de 1830 por imprentas francesas especializadas en libros en español. Este artículo analiza los distintos modelos culinarios y de nación presentes en dos recetarios afrancesados -el Arte novísimo de cocina y el Nuevo cocinero americano/mexicano en forma de diccionario- ysu relación con el contexto decimonónico de construcción de la nación mexicana.The first Mexican recipe books were published in the early 1830’s ...

  16. Estado del vireinato de santafé, nuevo reino de granada

    OpenAIRE

    Antonio Moreno, Francisco

    2010-01-01

    Estado del vireinato de Santafé y relación de su gobierno y mando del Excelentísimo señor Bailio frai Pedro Mesia de la Cerda. Informe enviado en el año de 1772, al final del Gobierno del Virrey. Expone las condiciones de la Nueva Granada luego de la renuncia del Virrey. Contiene una descrición geográfica del virreinato; las condiciones en que se establecen las audiencias y causas; la relación de habitantes y los tipos de población del virreinato; el listado de los gobiernos militares y polít...

  17. Decoupling of TX and RX antennas in a full-duplex mobile terminal

    DEFF Research Database (Denmark)

    Foroozanfard, Ehsan; Carvalho, Elisabeth De; Pedersen, Gert F.

    2016-01-01

    In this paper, a Full-duplex (FD) antenna system is presented with a high isolation between the TX and RX antennas. The isolation method is based on utilizing balanced antennas to localize the current on the ground plane and single mode excitation of the ground plane with capacitive coupling...... elements. The simulation results show a promising isolation level of 75 dB. User impact investigation on the antenna isolation, antenna matching and efficiency is presented. The isolation level varies from 60 dB to 30 dB in the worst user scenarios. The proposed antenna system can be used in a MISO/SIMO FD...

  18. De la imitación en el arte de escribir

    Directory of Open Access Journals (Sweden)

    Julian Motta Salas

    1962-02-01

    Full Text Available En el glorioso tiempo del Renacimiento fue conocidísima la controversia que mantuvieron Ángel Ambrogini, llamado Poliz'ano, príncipe de las letras latinas de fines del siglo XV, y Pablo Cortese, señaladísimo también en el culto a las letras clásicas. Sostenían los dos ilustres escritores ideas contrarias acerca de una cuestión doctrinal tan debatida e importante como la de la imitación en el arte de escribir, o en la composición de la obra literaria.

  19. Divagaciones críticas sobre tres pintores sevillanos

    Directory of Open Access Journals (Sweden)

    Carlos Restrepo Canal

    1964-05-01

    Full Text Available De tres grandes pintores se ufana la ciudad de Sevilla, y los honra como debe, porque estos ilustres hijos suyos dejaron obra que dio fama a la pintura española, y uno de ellos es maestro indiscutible del arte pictórico universal. Son estos artistas, prez de los pinceles españoles, Velázquez, Murillo y Valdés Leal, diferentísimos en su inspiración y en la forma de expresión artísticas pero, sin embargo, identificados en los rasgos generales de la escuela peninsular.

  20. Armonía Somers: la difícil andadura de una obra

    OpenAIRE

    Femenías, María Luisa

    2003-01-01

    La vasta obra de Armonía Somers ha reunido numerosas lecturas. Si algo añade la del presente trabajo es su enfoque que dista de ser literario. Con esto quiero subrayar que la filosofía de género es el punto de partida de este intento de interpretar algunos aspectos del riquísimo libro La mujer desnuda. Incorporo, en consecuencia, elementos interpretativos procedentes de campos ajenos a las letras y, sin intención de agotar la obra, pretendo dar cuenta de algunos marcados simbolismos, no siemp...

  1. Números perfectos, multiperfectos y amigos

    OpenAIRE

    Alonso Santamaría, Diego

    2016-01-01

    Se están sucediendo, en tiempo presente, progresos en lo relativo a estos antiquísimos números, historia viva de las matemáticas. A lo largo de este trabajo realizaremos un recorrido por todos los avances que se han producido en estos ancestrales números, presentaremos los métodos de búsqueda utilizados y qué nivel de conocimiento se posee aún de ellos, finalizando con los principales misterios sin resolver que a día de hoy ocultan. Grado en Matemáticas

  2. Motor homopolar

    OpenAIRE

    Martín Muñoz, Agustín

    2007-01-01

    Mostramos la construcción de un modelo de motor homopolar, uno de los más antiguos tipos de motores eléctricos. Se caracterizan porque el campo magnético del imán mantiene siempre la misma polaridad (de ahí su nombre, del griego homos, igual), de modo que, cuando una corriente eléctrica atraviesa el campo magnético, aparece una fuerza que hace girar los elementos no fijados mecánicamente. En el sencillísimo motor homopolar colgado (Schlichting y Ucke 2004), el imán puede girar ...

  3. Adjetivo superlativo na fala de homens gays: uma discussão sociolinguística

    OpenAIRE

    Felix, Rafael de Almeida Arruda [UNESP

    2016-01-01

    Partindo da observação de que o uso do superlativo no português do Brasil, principalmente em formas com o sufixo -érrimo e -ésimo, poderia estar associado à fala de homens gays, esta pesquisa de mestrado propõe analisar a fala de homens gays através de entrevistas sociolinguísticas, a fim de verificar se o uso de superlativo poderia configurar uma característica real e/ou indiciária de um falar gay. Com vistas a alcançar esse objetivo, analisamos dados coletados de amostras de fala de 24 info...

  4. Numbers Rule The Vexing Mathematics of Democracy, from Plato to the Present

    CERN Document Server

    Szpiro, George G

    2010-01-01

    Since the very birth of democracy in ancient Greece, the simple act of voting has given rise to mathematical paradoxes that have puzzled some of the greatest philosophers, statesmen, and mathematicians. Numbers Rule traces the epic quest by these thinkers to create a more perfect democracy and adapt to the ever-changing demands that each new generation places on our democratic institutions. In a sweeping narrative that combines history, biography, and mathematics, George Szpiro details the fascinating lives and big ideas of great minds such as Plato, Pliny the Younger, Ramon Llull, Pierre Simo

  5. Hybrid Si/TMD 2D electronic double channels fabricated using solid CVD few-layer-MoS2 stacking for Vth matching and CMOS-compatible 3DFETs

    KAUST Repository

    Chen, Min Cheng

    2014-12-01

    Stackable 3DFETs such as FinFET using hybrid Si/MoS2 channels were developed using a fully CMOS-compatible process. Adding several molecular layers (3-16 layers) of the transition-metal dichalcogenide (TMD), MoS2 to Si fin and nanowire resulted in improved (+25%) Ion,n of the FinFET and nanowire FET (NWFET). The PFETs also operated effectively and the N/P device Vth are low and matched perfectly. The proposed heterogeneous Si/TMD 3DFETs can be useful in future electronics. © 2014 IEEE.

  6. Sertula Florae Colombiae – XV: Nuevas Melastomatáceas

    Directory of Open Access Journals (Sweden)

    Uribe Uribe Lorenzo

    1980-09-01

    Full Text Available El notable aumento de las colecciones del Herbario Nacional Colombiano muestran la riqueza de la flora melastomatácea de Colombia. Uno de los géneros más ricos y más bien caracterizados es Blakea. En este artículo describo dos nuevas especies muy interesantes. Dejo consignada mi gratitud para elnotable dibujante, don Silvio Fernández Valencia, a quien se deben las magníficas ilustraciones y muchos datos y mediciones de órganos pequeñísimos, que facilitaron  las descripciones exactas de las plantas.

  7. Revolución de la prensa checoeslovaca

    Directory of Open Access Journals (Sweden)

    Jan Steiner

    2015-01-01

    Full Text Available Relato de tres periodistas checos que participaron directamente en los sucesos de noviembre de 1989, en la que la policía checa hizo una brutal represión contra una pacífica demostración estudiantil para recordar el quincuagésimo aniversario del día internacional de los estudiantes que cambiaron el futuro de una nación. Trata también sobre la estructura de sus medios de comunicación. Los de "arriba" fueron destruidos.

  8. La seguridad en los países que rodean a Colombia

    OpenAIRE

    Universidad del Rosario, Programa de Divulgación Científica

    2006-01-01

    En América Latina el tema de la seguridad nunca ha sido -hasta ahora- objeto de una atención y preocupación constante y sistemática por parte del foro académico en tanto dimensión específica de los problemas de las relaciones internacionales. A ello ha contribuido lo que algunos estudiosos han denominado la “relativa irrelevancia” de la región en materia de seguridad a nivel mundial, resultado de diversos factores dentro de los que pueden destacarse al menos los tres siguientes: el bajísimo ...

  9. La moallakat de Imru-Ulkais (Un poeta y un poema del siglo VI

    Directory of Open Access Journals (Sweden)

    Victor Sánchez Montenegro

    1961-05-01

    Full Text Available Escudriñando papeles y documentos antiquísimos, en medio de la selva de libros raros y curiosos que por desgracia está sin explotar, me encontré con varios estudios de siglos lejanos sobre la primitiva poesía árabe que corresponde a la época anteislámica, es decir, del siglo VI hasta el comienzo de la Hégira, en 1662, cuando Mahoma se fugó de la Meca, perseguido por la predicación de su nueva doctrina.

  10. Ingeniería Civil, 2010-11

    OpenAIRE

    Villarino Otero, Alberto

    2010-01-01

    I. Materiales de clase: Tema 1. Maquinaria de Obra Civil; Tema 2. Materiales de Construcción; Tema 3. Muros; Tema 4. Cimentaciones; Tema 5. Presas; Tema 6. Carreteras; Tema 7. Puentes; Tema 8. Teoría y Cálculo de Estructuras; Tema 9. Proyectos. II. Bibliografía. El curso Ingeniería Civil engloba un campo extensísimo, constituyendo el curso un breve resumen, intentado tratar los temas de mayor relevancia y con los cuales el ingeniero tendrá contacto directo en su vida profesional. El cu...

  11. Hybrid Si/TMD 2D electronic double channels fabricated using solid CVD few-layer-MoS2 stacking for Vth matching and CMOS-compatible 3DFETs

    KAUST Repository

    Chen, Min Cheng; Lin, Chia Yi; Li, Kai Hsin; Li, Lain-Jong; Chen, Chang Hsiao; Chuang, Cheng Hao; Lee, Ming Dao; Chen, Yi Ju; Hou, Yun Fang; Lin, Chang Hsien; Chen, Chun Chi; Wu, Bo Wei; Wu, Cheng San; Yang, Ivy; Lee, Yao Jen; Yeh, Wen Kuan; Wang, Tahui; Yang, Fu Liang; Hu, Chenming

    2014-01-01

    Stackable 3DFETs such as FinFET using hybrid Si/MoS2 channels were developed using a fully CMOS-compatible process. Adding several molecular layers (3-16 layers) of the transition-metal dichalcogenide (TMD), MoS2 to Si fin and nanowire resulted in improved (+25%) Ion,n of the FinFET and nanowire FET (NWFET). The PFETs also operated effectively and the N/P device Vth are low and matched perfectly. The proposed heterogeneous Si/TMD 3DFETs can be useful in future electronics. © 2014 IEEE.

  12. Coupling of dimethylsulfide oxidation to biomass production by a marine flavobacterium

    Digital Repository Service at National Institute of Oceanography (India)

    Green, D.H.; Shenoy, D.M.; Hart, M.C.; Hatton, A.D.

    . Stirling, and J. R. Quayle. 1982. Co-metabolism [and discussion]. Phil Trans R Soc Lond B 297:481-496. 7. del Valle, D. A., D. J. Kieber, and R. P. Kiene. 2007. Depth-dependent fate of biologically- consumed dimethylsulfide in the Sargasso Sea. Mar Chem.... Klenk. 1985. Measurement of protein using bicinchoninic acid. Anal Biochem 150:76-85. 27. Vila-Costa, M., D. A. del Valle, J. M. Gonzalez, D. Slezak, R. P. Kiene, O. Sanchez, and R. Simo. 2006. Phylogenetic identification and metabolism of marine...

  13. Experiencias productivas, visión del mundo y unidad obrera: el proceso de trabajo como dimensión explicativa de los conflictos laborales

    OpenAIRE

    Dicósimo, Daniel Oscar; Instituto Interdisciplinario de Economía Política de Buenos Aires

    2009-01-01

    Se estudia una serie de acontecimientos sucedidos en una fábrica metalúrgica bonaerense durante el autodenominado "Proceso de Reorganización Nacional". Se trató de medidas de fuerza realizadas por el personal de Metalúrgica Tandil, la principal fundidora de auto partes del mercado durante la década de 1970, con el objetivo de resistir a la decisión empresaria de cambiar parte de la organización del trabajo y de reclamar aumentos salariales. Fil: Dicósimo, Daniel Oscar. Universidad Nacional...

  14. Catálogo de los puentes proyectados por Jules Sagebien en la provincia de Matanzas.

    OpenAIRE

    Luis R. González Arestuche; C. J. Rolo Pico; Rubén A. Delgado Rodríguez

    2014-01-01

    Esta investigación recopila en documento único, el mejor quehacer de uno de los principales forjadores de Matanzas como ciudad y del desarrollo industrial inicial, alcanzado en el siglo XIX, para la demarcación. El respeto hacia la conservación y el rescate del patrimonio construido en la actual provincia homónima, por sus altísimos valores: histórico, cultural y tecnológico, considera la necesidad del conocimiento ciudadano sobre la actividad del francés Jules Sagebien Tavernier. Desde el añ...

  15. Un estudio del juego de bolos en Boiro: aspectos históricos, estado actual de práctica y perspectivas de futuro

    Directory of Open Access Journals (Sweden)

    José Eugenio Rodríguez Fernández

    2015-04-01

    Full Text Available En este estudio de investigación se recogen las particularidades de la práctica del juego de bolos en el Ayuntamiento de Boiro (A Coruña, único municipio de la provincia donde en la actualidad se mantiene vivo este juego popular y tradicional, un deporte antiquísimo, muy extendido en todas las culturas (Ruiz, 2000 y uno de los más practicados en todo el mundo en sus diferentes modalidades y variantes.

  16. Una Ventana al Trabajo Infantil Doméstico: La experiencia en Colombia

    OpenAIRE

    González, Paula

    2004-01-01

    Entrado el siglo XXI, nadie puede poner en duda que el trabajo infantil es un problema que lesiona severamente a las sociedades de los países que lo padecen. Sobre este tema se ha escrito muchísimo y se han hecho desarrollos legislativos muy importantes que van desde la Declaración de los Derechos del Niño proclamada por la Asamblea General de las Naciones Unidas en noviembre de 1959, hasta la suscripción de la Convención sobre los Derechos del Niño adoptada por la Asamblea General de las Nac...

  17. Padrões de distribuição e diversidade de espécies da mirmecofauna (hymenoptera, formicidae) de uma savana estépica (chaco) no município de Porto Murtinho, Mato Grosso do Sul, Brasil

    OpenAIRE

    Souza, Paulo Robson de

    2014-01-01

    O Gran Chaco é o único bosque seco subtropical do mundo. Considerado a segunda floresta mais extensa da América do Sul, ocorre preponderantemente na Argentina, Paraguai e Bolívia, sendo que apenas sete centésimos da sua área localizam-se no Brasil, no extremo sul da planície pantaneira, onde apresenta quatro fitofisionomias mais marcantes e diversas espécies vegetais endêmicas. Apesar de sua reconhecida importância ecológica no contexto continental, a fração brasileira do Chaco passa por séri...

  18. Alcances en materia jurídico electoral de la recién promulgada Ley 9379 para la promoción de la Autonomía Personal de las Personas con Discapacidad: Un análisis de la función cuasi legislativa del Tribunal Supremo de Elecciones

    OpenAIRE

    Lucía Soto Chacón

    2018-01-01

    En el marco del vigésimo aniversario de la promulgación de la Ley 7600, y habiéndose cumplido ocho años desde la ratificación de la Convención sobre los Derechos de las Personas con Discapacidad por parte del Estado costarricense, se promulgó en agosto de 2016 la ley 9379 para la Promoción de la Autonomía Personal de las Personas con Discapacidad. Esta norma busca dotar de asistentes personales y apoyo legal a aquellos sujetos con diversidad funcional cuya situación económica no les permite a...

  19. Factores del pronóstico en periodoncia

    OpenAIRE

    Botero Zuluaga, Leticia; Vélez L, María Eugenia; Alvear Espinal, Fanny Stella

    2008-01-01

    La asignación del pronóstico se ha hecho durante muchísimo tiempo de manera subjetiva según la opinión del experto tratante; porque aunque los textos clásicos suelen nombrar un conjunto de variables que influencian el pronóstico, cada lector según su experiencia personal interpreta y le da valor diferente a cada una de ellas. En esta revisión se pretende mostrar la evidencia disponible que permite valorar de manera más objetiva el peso de cada variable a la hora de asignar el pronóstico. Las ...

  20. El rasgo invariante como respuesta subjetiva en el autismo

    OpenAIRE

    Torres, Mónica Miriam

    2015-01-01

    Trascendiendo las diversas presentaciones posibles del autismo, ya la psiquiatría clásica recortaba rasgos constantes, invariantes que se desplegaban en todos los casos. Estos fenómenos en cuestión fueron considerados desde la fundación del cuadro clínico por Leo Kanner en 1943, como gravísimos trastornos. A pesar de que además de aparecer de manera drástica impregnando el cuadro también surgían en otros casos al modo de rasgos discretos y sutiles - como lo mencionaba Hans Asperger en las des...

  1. Análisis de vulnerabilidades de protocolos de protección y autenticación inalámbrico para el aceso seguro en redes Wifi

    OpenAIRE

    Ramos Valencia, Marco Vinicio

    2012-01-01

    Las redes wireless se difunden con rapidez, gran comodidad y ventajas que suponen estas nuevas tecnologías de conexión generando que muchísimos usuarios no se hayan percatado de los peligros a que están expuestas las redes wireless (al no haber ya una conexión física).Es así que el crecimiento desmedido de conexiones sin cable ha creado la curiosidad de muchos a tratar de interferir en estas, logrando en muchos de los casos obtener claves de acceso, negar el servicio o realizar suplantaciones...

  2. Radioisotope space power generator annual report, July 1, 1974--June 30, 1975

    International Nuclear Information System (INIS)

    Elsner, N.B.; Chin, J.; Staley, H.G.

    1976-01-01

    The Isotec Technology Program for FY-75 concentrated on materials development efforts in two areas: TPM-217 P-type material and SiGe technology. TPM-217 P-type material is a 3M proprietary thermoelectric material whose principal components are Cu, Ag, and Se. The usefulness of TPM-217 P-type selenide in thermoelectric converters depends on its dimensional, electrical, and thermal stability at high temperature and its compatibility with other converter component materials in a low-pressure environment. Experimental efforts were directed toward determining (1) the vapor species above TPM-217 from 700 0 to 1100 0 C, (2) the weight loss rate for TPM-217 at 900 0 C in vacuo, and (3) the stability of TPM-217 material in contact with Mo, Fe, 316 stainless steel, and pyrocarbon. The Si-Ge program is a continuation of the experimental work performed during FY-74. The development of coatings to suppress the vaporization of SiMo and SiGe continued. Techniques for applying ion-plated and chemical-vapor-deposited coatings of Si 3 N 4 and (Si,Al)N alloys on SiMo were examined. Methods of controlling morphology and the chemical composition of these coatings were developed. Rates of vaporization for coated samples at 1100 0 C were measured

  3. Progress report No. 39 for a program of thermoelectric-generator testing and RTG degradation-mechanisms evaluation

    International Nuclear Information System (INIS)

    Lockwood, A.; Shields, V.

    1981-01-01

    Two neodymium selenide n-type legs and two new p-type Cu-Se legs have been set up for testing. Weight loss measurements for coated Si-Ge material produced by G.E. are reported. The coating on the n-type Si-Ge legs and the n-type side of the Si-Mo hot shoes has disappeared. The coating on the p-type side of the Si-Mo hot shoes has almost completely degraded. It is unlikely that the G.E. coatings have ever been effective. Thermal conductivity measurements are in agreement. The remaining MHW generator on test, Q1-A, has accumulated 28,600 hours and performance remains stable. The performance of the 18 couple modules remains stable. The S/N-1 module has accumulated 30,000 hours and the S/N-3 module has reached 27,300 hours. Telemetry data indicate no changes in the trends of degradation of LES 8 and 9 and the Voyager RTGs

  4. Calidad del llenado de los certificados de defunción en un hospital público de Chiclayo, Perú 2006

    Directory of Open Access Journals (Sweden)

    Víctor Soto-Cáceres

    2008-07-01

    Full Text Available Se evaluó la calidad del llenado de los certificados de defunción que se extienden en el Hospital Nacional "Almanzor Aguinaga Ausejo" de Chiclayo. Se revisó la totalidad de los certificados emitidos entre julio y septiembre 2006 (n=287, calificándolos como buenos, regulares, malos y pésimos. Sólo 33,8% tuvieron un buen llenado y 44,6% fueron pésimos (99 o malos (29. Los servicios de cuidados intensivos (61,2% y medicina interna (41,4% tuvieron mayor porcentaje de certificados buenos, mientras que los de pésima calidad fueron emitidos con mayor frecuencia en los servicios de pediatría y neonatología (88,9%, cirugía y afines (55,6%, especialidades médicas (50,0% y emergencia (42,5%. Es necesario implementar estrategias de capacitación en el llenado de los certificados de defunción para los médicos.

  5. Los recetarios “afrancesados” del siglo XIX en México. French-fashioned Mexican recipe books in the 19th century. Globalization and construction of a national culinary model

    Directory of Open Access Journals (Sweden)

    Sarah Bak-Geller Corona

    2009-12-01

    Full Text Available Algunos de los primeros libros de cocina mexicanos fueron publicados en la década de 1830 por imprentas francesas especializadas en libros en español. Este artículo analiza los distintos modelos culinarios y de nación presentes en dos recetarios afrancesados -el Arte novísimo de cocina y el Nuevo cocinero americano/mexicano en forma de diccionario- ysu relación con el contexto decimonónico de construcción de la nación mexicana.The first Mexican recipe books were published in the early 1830’s by French publishing houses specialized in Spanish written books. This article deals with the different nationalistic and cuisine models in two French-fashioned Mexican recipe books -the Arte novísimo de cocina and the Nuevo cocinero americano/mexicano en forma de diccionario- and their relationship with the nation-building context in nineteenth century Mexico.

  6. Les livres de recettes « francisés » au Mexique au XIXe siècle

    Directory of Open Access Journals (Sweden)

    Sarah Bak-Geller Corona

    2008-05-01

    Full Text Available L’apparition des premiers livres de cuisine au Mexique - publiés par des maisons d’édition françaises spécialisées en ouvrages en espagnol - marque le début de l’histoire de la cuisine mexicaine. Cet événement s’inscrit par ailleurs dans une histoire plus large : celle de la construction de l’État-nation, entre nationalisme et cosmopolitisme. L’article s’intéresse aux idéaux de nation et de cuisine cohabitant dans deux des livres de recettes francisés du XIXe siècle au Mexique : l’Arte novísimo de cocina et le Nuevo cocinero americano/mexicano en forma de diccionario.French-fashioned Mexican recipe books in the 19th century. Globalization and construction of a national culinary modelThe first Mexican recipe books were published in the early 1830’s by French publishing houses specialized in Spanish written books. This article deals with the different nationalistic and cuisine models in two French-fashioned Mexican recipe books -the Arte novísimo de cocina and the Nuevo cocinero americano/mexicano en forma de diccionario- and their relationship with the nation-building context in nineteenth century Mexico.

  7. General model and control of an n rotor helicopter

    DEFF Research Database (Denmark)

    Sidea, Adriana-Gabriela; Brogaard, Rune Yding; Andersen, Nils Axel

    2015-01-01

    The purpose of this study was to create a dynamic, nonlinear mathematical model ofa multirotor that would be valid for different numbers of rotors. Furthermore, a set of SingleInput Single Output (SISO) controllers were implemented for attitude control. Both model andcontrollers were tested exper...

  8. Automatic control of a liquid nitrogen cooled, closed-circuit, cryogenic pressure tunnel

    Science.gov (United States)

    Balakrishna, S.; Goglia, G. L.

    1980-01-01

    The control system design, performance analysis, microprocesser based controller software development, and specifications for the Transonic Cryogenic Tunnel (TCT) are discussed. The control laws for the single-input single-output controllers were tested on the TCT simulator, and successfully demonstrated on the TCT.

  9. MIMO feed-forward design in wafer scanners using a gradient approximation-based algorithm

    NARCIS (Netherlands)

    Heertjes, M.F.; Hennekens, D.W.T.; Steinbuch, M.

    2010-01-01

    An experimental demonstration is given of a data-based multi-input multi-output (MIMO) feed-forward control design applied to the motion systems of a wafer scanner. Atop a nominal single-input single-output (SISO) feed-forward controller, a MIMO controller is designed having a finite impulse

  10. Cylinder Pressure-based Combustion Control with Multi-pulse Fuel Injection

    NARCIS (Netherlands)

    Luo, X.; Wang, S.; Jager, B. de; Willems, F.P.T.

    2015-01-01

    With an increased number of fuel injection pulses, the control problem in diesel engines becomes complex. Consisting of multiple single-input single-output (SISO) controllers, the conventional control strategy shows unsatisfactory dynamic performance in tracking combustion load and phase reference

  11. Optimal Hankel Norm Model Reduction by Truncation of Trajectories

    NARCIS (Netherlands)

    Roorda, B.; Weiland, S.

    2000-01-01

    We show how optimal Hankel-norm approximations of dynamical systems allow for a straightforward interpretation in terms of system trajectories. It is shown that for discrete time single-input systems optimal reductions are obtained by cutting 'balanced trajectories', i.e., by disconnecting the past

  12. PERMODELAN INDEKS HARGA KONSUMEN INDONESIA DENGAN MENGGUNAKAN MODEL INTERVENSI MULTI INPUT

    KAUST Repository

    Novianti, Putri Wikie; Suhartono, Suhartono

    2017-01-01

    -searches that have been done are only contain of an intervention with single input, ei-ther step or pulse function. Multi input intervention was used in Indonesia CPI case because there are some events which are expected effecting CPI. Based on the result, those

  13. Evaluation of Linear and Non-Linear Control Schemes Applied to a Hydraulic Servo System

    DEFF Research Database (Denmark)

    Andersen, Torben Ole; Hansen, Michael Rygaard; Pedersen, Henrik Clemmensen

    2005-01-01

    Due to the innovation of low-cost electronics such as sensors, microcontrollers etc., the focus on highperformance motion control is increasing. This work focuses on position control of single-input single-output hydraulic servo-systems in general. A hydraulically actuated robotic manipulator...

  14. Fuels planning: science synthesis and integration; environmental consequences fact sheet 12: Water Erosion Prediction Project (WEPP) Fuel Management (FuMe) tool

    Science.gov (United States)

    William Elliot; David Hall

    2005-01-01

    The Water Erosion Prediction Project (WEPP) Fuel Management (FuMe) tool was developed to estimate sediment generated by fuel management activities. WEPP FuMe estimates sediment generated for 12 fuel-related conditions from a single input. This fact sheet identifies the intended users and uses, required inputs, what the model does, and tells the user how to obtain the...

  15. Desenvolvimento das gônadas de Dermatobia hominis (Diptera: Cuterebridae

    Directory of Open Access Journals (Sweden)

    Edy de Lello

    1985-06-01

    Full Text Available O trabalho descreve o desenvolvimento das gônadas do berne (D. hominis durante o período pupal. As pupas desenvolvidas de larvas com peso superior a 650 mg, deram imagos fêmeas, enquanto que as desenvolvidas daquelas pesando entre 500 e 650 mg deram macho, tendo havido um erro ao redor de 5%. Até o oitavo dia de pupação os testículos crescem mais que os ovários; a partir daí diminui o desenvolvimento, parando de crescer entre o vigésimo e vigésimo quinto dias. A espermatogênese inicia por volta do sétimo dia de pupa quando é grande o número de espermatócitos. No décimo dia alguns testículos apresentam considerável número de espermátides e os espermatozóides começam a aparecer por volta do vigésimo dia. A espermiogênese desenvolve-se sem interrupção e ao final da pupação quase toda loja testicular está repleta de espermatózóides. Os machos começam a nascer dois dias antes das fêmeas. Nessas, os ovaríolos aparecem formados por volta do oitavo dia de pupa; os folículos se individualizam por volta do vigésimo dia de pupa onde se distingue os trofócitos com núcleos politênicos e citoplasmas bem basófilos, enquanto o ovócito tem citoplasma mais acidófilo e núcleo com cromatina bastante frouxa. A vitelogênese tem início ao redor do vigésimo quinto dia de pupa e se completa ao nascimento da imago. A ligação das gônadas com suas respectivas estruturas somáticas acontece ao redor do décimo terceiro dia de pupação.Gonadal development of Dermatobia hominis during pupal period is described. Pupae developing from larvae weighing above 650 mg turned into female flies whereas the ones from larvae weighing between 500 and 600 mg turned into males (with plus of minus 5% of error. Up to the 8th day of pupation the testes are larger than the ovaries; from that time on they decrease their speed of development and stop growing between the 20th and 25th day. The spermatogenesis starts around the 7th day when there

  16. Advanced Signal Processing for MIMO-OFDM Receivers

    DEFF Research Database (Denmark)

    Manchón, Carles Navarro

    This thesis deals with a wide range of topics within the research area of advanced baseband receiver design for wireless communication systems. In particular, the work focuses on signal processing algorithms for receivers in multiple-input multiple-output (MIMO) orthogonal frequency-division mult......This thesis deals with a wide range of topics within the research area of advanced baseband receiver design for wireless communication systems. In particular, the work focuses on signal processing algorithms for receivers in multiple-input multiple-output (MIMO) orthogonal frequency...... the structure of the receiver with the hope that the resulting heuristic architecture will exhibit the desired behavior and performance. On the other hand, one can employ analytical frameworks to pose the problem as the optimization of a global objective function subject to certain constraints. This work...

  17. MIMO Techniques for Jamming Threat Suppression in Vehicular Networks

    Directory of Open Access Journals (Sweden)

    Dimitrios Kosmanos

    2016-01-01

    Full Text Available Vehicular ad hoc networks have emerged as a promising field of research and development, since they will be able to accommodate a variety of applications, ranging from infotainment to traffic management and road safety. A specific security-related concern that vehicular ad hoc networks face is how to keep communication alive in the presence of radio frequency jamming, especially during emergency situations. Multiple Input Multiple Output techniques are proven to be able to improve some crucial parameters of vehicular communications such as communication range and throughput. In this article, we investigate how Multiple Input Multiple Output techniques can be used in vehicular ad hoc networks as active defense mechanisms in order to avoid jamming threats. For this reason, a variation of spatial multiplexing is proposed, namely, vSP4, which achieves not only high throughput but also a stable diversity gain upon the interference of a malicious jammer.

  18. On the finite-SNR diversity-multiplexing tradeoff of zero-forcing transmit scheme under secrecy constraint

    KAUST Repository

    Rezki, Zouheir

    2011-06-01

    In this paper, we address the finite Signal-to-Noise Ratio (SNR) Diversity-Multiplexing Tradeoff (DMT) of the Multiple Input Multiple Output (MIMO) wiretap channel, where a Zero-Forcing (ZF) transmit scheme, that intends to send the secret information in the orthogonal space of the eavesdropper channel, is used. First, we introduce the secret multiplexing gain at finite-SNR that generalizes the definition at high-SNR. Then, we provide upper and lower bounds on the outage probability under secrecy constraint, from which secret diversity gain estimates of ZF are derived. Through asymptotic analysis, we show that the upper bound underestimates the secret diversity gain, whereas the lower bound is tight at high-SNR, and thus its related diversity gain estimate is equal to the actual asymptotic secret diversity gain of the Multiple-Input Multiple-Output (MIMO) wiretap channel. © 2011 IEEE.

  19. Lateral control strategy for a hypersonic cruise missile

    Directory of Open Access Journals (Sweden)

    Yonghua Fan

    2017-04-01

    Full Text Available Hypersonic cruise missile always adopts the configuration of waverider body with the restraint of scramjet. As a result, the lateral motion exhibits serious coupling, and the controller design of the lateral lateral system cannot be conducted separately for yaw channel and roll channel. A multiple input and multiple output optimal control method with integrators is presented to design the lateral combined control system for hypersonic cruise missile. A hypersonic cruise missile lateral model is linearized as a multiple input and multiple output plant, which is coupled by kinematics and fin deflection between yaw and roll. In lateral combined controller, the integrators are augmented, respectively, into the loop of roll angle and lateral overload to ensure that the commands are tracked with zero steady-state error. Through simulation, the proposed controller demonstrates good performance in tracking the command of roll angle and lateral overload.

  20. Small Terminal MIMO Channels with User Interaction

    DEFF Research Database (Denmark)

    Pedersen, Gert Frølund; Andersen, Jørgen Bach; Eggers, Patrick Claus F.

    2007-01-01

    This paper gives an overview of results obtained from measurements of different types of multiple-input multiple-output (MIMO) channels. For the indoor case measurements were made at 5.8 GHz from access points (APs) to mobile stations (MSs) at different places in a large open office type room. Th...... an investigation of the potentials for communication between cars approaching as well as in convoy and from inside and outside the car....

  1. A Single MO-CFTA Based Electronically/Temperature Insensitive Current-mode Half-wave and Full-wave Rectifiers

    OpenAIRE

    Weerapon Kongnun; Phamorn Silapan

    2013-01-01

    The article presents a current-mode full-wave rectifier employing multiple output current follower transconductance amplifier (MO-CFTA). The both circuits description is very simple, it merely comprises only single MO-CFTA, without external passive element. In addition, the magnitude and direction of output currents can be controlled via electronically method. Furthermore, the outputs are independent of the thermal voltage (VT). The performances of the proposed circuits are investigated thro...

  2. Design Of Feedforward Controllers For Multivariable Plants

    Science.gov (United States)

    Seraji, Homayoun

    1989-01-01

    Controllers based on simple low-order transfer functions. Mathematical criteria derived for design of feedforward controllers for class of multiple-input/multiple-output linear plants. Represented by simple low-order transfer functions, obtained without reconstruction of states of commands and disturbances. Enables plant to track command while remaining unresponsive to disturbance in steady state. Feedback controller added independently to stabilize plant or to make control system less susceptible to variations in parameters of plant.

  3. Downlink Training Techniques for FDD Massive MIMO Systems: Open-Loop and Closed-Loop Training with Memory

    OpenAIRE

    Choi, Junil; Love, David J.; Bidigare, Patrick

    2013-01-01

    The concept of deploying a large number of antennas at the base station, often called massive multiple-input multiple-output (MIMO), has drawn considerable interest because of its potential ability to revolutionize current wireless communication systems. Most literature on massive MIMO systems assumes time division duplexing (TDD), although frequency division duplexing (FDD) dominates current cellular systems. Due to the large number of transmit antennas at the base station, currently standar...

  4. A New Energy-Efficient Data Transmission Scheme Based on DSC and Virtual MIMO for Wireless Sensor Network

    OpenAIRE

    Li, Na; Zhang, Liwen; Li, Bing

    2015-01-01

    Energy efficiency in wireless sensor network (WSN) is one of the primary performance parameters. For improving the energy efficiency of WSN, we introduce distributed source coding (DSC) and virtual multiple-input multiple-output (MIMO) into wireless sensor network and then propose a new data transmission scheme called DSC-MIMO. DSC-MIMO compresses the source data using distributed source coding before transmitting, which is different from the existing communication schemes. Data compression c...

  5. The promise of downlink MU-MIMO for high-capacity next generation mobile broadband networks based on IEEE 802.16 m

    OpenAIRE

    Papathanassiou Apostolos; Davydov Alexei

    2011-01-01

    Abstract The dramatic increase of the demand for mobile broadband services poses stringent requirements on the performance evolution of currently deployed mobile broadband networks, such as Mobile WiMAX Release 1 and 3GPP LTE Release 8. Although the combination of single-user multiple-input multiple-output (SU-MIMO) and orthogonal frequency division multiple access (OFDMA) provide the appropriate technologies for improving the downlink performance of third generation (3G) code division multip...

  6. Efficient Bayesian Compressed Sensing-based Channel Estimation Techniques for Massive MIMO-OFDM Systems

    OpenAIRE

    Al-Salihi, Hayder Qahtan Kshash; Nakhai, Mohammad Reza

    2017-01-01

    Efficient and highly accurate channel state information (CSI) at the base station (BS) is essential to achieve the potential benefits of massive multiple input multiple output (MIMO) systems. However, the achievable accuracy that is attainable is limited in practice due to the problem of pilot contamination. It has recently been shown that compressed sensing (CS) techniques can address the pilot contamination problem. However, CS-based channel estimation requires prior knowledge of channel sp...

  7. Phase-Shift Cyclic-Delay Diversity for MIMO OFDM Systems

    Directory of Open Access Journals (Sweden)

    Young-Han Nam

    2010-01-01

    Full Text Available Phase-shift cyclic-delay diversity (PS CDD scheme and space-frequency-block-code (SFBC PS CDD are developed for multiple-input-multiple-output (MIMO orthogonal frequency division multiplexing (OFDM systems. The proposed PS CDD scheme preserves the diversity advantage of traditional CDD in uncorrelated multiantenna channels, and furthermore removes frequency-selective nulling problem of the traditional CDD in correlated multiantenna channels.

  8. Analytical Computation of Information Rate for MIMO Channels

    Directory of Open Access Journals (Sweden)

    Jinbao Zhang

    2017-01-01

    Full Text Available Information rate for discrete signaling constellations is significant. However, the computational complexity makes information rate rather difficult to analyze for arbitrary fading multiple-input multiple-output (MIMO channels. An analytical method is proposed to compute information rate, which is characterized by considerable accuracy, reasonable complexity, and concise representation. These features will improve accuracy for performance analysis with criterion of information rate.

  9. Spatial Dynamic Wideband Modeling of the MIMO Satellite-to-Earth Channel

    OpenAIRE

    Lehner, Andreas; Steingass, Alexander

    2014-01-01

    A novel MIMO (multiple input multiple output) satellite channel model that allows the generation of associated channel impulse response (CIR) time series depending on the movement profile of a land mobile terminal is presented in this paper. Based on high precise wideband measurements in L-band the model reproduces the correlated shadowing and multipath conditions in rich detail. The model includes time and space variant echo signals appearing and disappearing in dependence on the receive ...

  10. 5G backhaul challenges and emerging research directions: a survey

    OpenAIRE

    Jaber, Mona; Imran, Muhammad Ali; Tafazolli, Rahim; Tukmanov, Anvar

    2016-01-01

    5G is the next cellular generation and is expected to quench the growing thirst for taxing data rates and to enable the Internet of Things. Focused research and standardization work have been addressing the corresponding challenges from the radio perspective while employing advanced features, such as network densification, massive multiple-input-multiple-output antennae, coordinated multi-point processing, inter-cell interference mitigation techniques, carrier aggregation, and new spectrum ex...

  11. On stabilisability of 2-D MIMO shift-invariant systems

    Czech Academy of Sciences Publication Activity Database

    Augusta, Petr; Augustová, Petra

    2013-01-01

    Roč. 350, č. 10 (2013), s. 2949-2966 ISSN 0016-0032 R&D Projects: GA ČR GPP103/12/P494 Institutional support: RVO:67985556 Keywords : spatially invariant system * stabilisation * multiple-input-multiple-output system, * positive polynomial Subject RIV: BC - Control Systems Theory Impact factor: 2.260, year: 2013 http://library.utia.cas.cz/separaty/2013/TR/augusta-0398772.pdf

  12. A Hub Matrix Theory and Applications to Wireless Communications

    Directory of Open Access Journals (Sweden)

    Kung HT

    2007-01-01

    Full Text Available This paper considers communications and network systems whose properties are characterized by the gaps of the leading eigenvalues of for a matrix . It is shown that a sufficient and necessary condition for a large eigen-gap is that is a "hub" matrix in the sense that it has dominant columns. Some applications of this hub theory in multiple-input and multiple-output (MIMO wireless systems are presented.

  13. High performance management: An illustrative example of sales departments’ productivity measurement

    OpenAIRE

    Halkos, George E.; Tzeremes, Nickolaos G

    2009-01-01

    This paper describes a conceptual approach to measure and compare productivity of resource utilization at the firm level, adapting a set of techniques known as Data Envelopment Analysis (DEA). Within this approach, the paper addresses the issues of multiple inputs and multiple outputs of the sales departments of a firm. In particular, we focus on the resource management of sales departments. The proposed measurement methodology will allow assessment of the impact of different management polic...

  14. Material resources, energy, and nutrient recovery from waste: are waste refineries the solution for the future?

    DEFF Research Database (Denmark)

    Tonini, Davide; Martinez-Sanchez, Veronica; Astrup, Thomas Fruergaard

    2013-01-01

    Waste refineries focusing on multiple outputs of material resources, energy carriers, and nutrients may potentially provide more sustainable utilization of waste resources than traditional waste technologies. This consequential life cycle assessment (LCA) evaluated the environmental performance....... Overall, the waste refinery provided global warming (GW) savings comparable with efficient incineration, MBT, and bioreactor landfilling technologies. The main environmental benefits from waste refining were a potential for improved phosphorus recovery (about 85%) and increased electricity production (by...

  15. Resource allocation for transmit hybrid beamforming in decoupled millimeter wave multiuser-MIMO downlink

    OpenAIRE

    Ahmed, Irfan; Khammari, Hedi; Shahid, Adnan

    2017-01-01

    This paper presents a study on joint radio resource allocation and hybrid precoding in multicarrier massive multiple-input multiple-output communications for 5G cellular networks. In this paper, we present the resource allocation algorithm to maximize the proportional fairness (PF) spectral efficiency under the per subchannel power and the beamforming rank constraints. Two heuristic algorithms are designed. The proportional fairness hybrid beamforming algorithm provides the transmit precoder ...

  16. New Configuration of Handset MIMO Antenna for LTE 700 Band Applications

    Directory of Open Access Journals (Sweden)

    Byeonggwi Mun

    2013-01-01

    Full Text Available A compact handset multiple-input multiple-output (MIMO antenna for long-term evolution (LTE 700 band (746~787 MHz applications is proposed. The proposed antenna consists of two symmetrical PIFAs. Without the usage of any additional coupling elements between closely mounted antennas, a high isolation (>15 dB and a low enveloped correlation coefficient (ECC<0.35 are achieved by the optimum location and arrangement of MIMO antenna elements.

  17. Application of WLF to OFDMA MU-MIMO Systems I: Frequency-Domain Equalization

    OpenAIRE

    Xiao, P; Lin, Z; Wu, Y; Schneider, C

    2013-01-01

    This paper presents a novel iterative receiver strategy incorporating widely linear filtering for uplink Orthogonal Frequency Division Multiple Access (OFDMA) multiuser multiple-input, multiple-output (MIMO) systems. The proposed iterative receiver scheme achieves better performance without the loss of spectrum efficiency compared to the conventional iterative receivers; The superiority of the investigated scheduler coupled with the innovative iterative receiver scheme over conventional solut...

  18. Efficiency measurement of Swiss shopping centers using Data Envelopment Analysis (DEA)

    OpenAIRE

    Alexandra Bay

    2015-01-01

    DEA as an Operations Research based linear programming approach for evaluating the relative performance of homogenous Decision Making Units (DMUs) is applied to Swiss shopping centers. Output-to-input efficiency ratios – as for example the sales productivity – incorporate one output (sales) and one input (sales area). Peer group comparisons (efficiency rankings) are difficult if multiple inputs and / or multiple outputs of different kind of data (quantitative, qualitative, categorical etc.) o...

  19. Vernier Delay Unit

    International Nuclear Information System (INIS)

    Pierce, W.B.

    1984-10-01

    This module will accept differential ECL pulses from the auxiliary rear panel or NIM level pulses from the front panel. The pulses are produced at the output with a fixed delay that is software programmable in steps of 0.1 ns over the range of 0.1 to 10.5 ns. Multiple outputs are available at the front panel. Minimum delay through the module is 9 ns

  20. Semi-blind identification of wideband MIMO channels via stochastic sampling

    OpenAIRE

    Andrieu, Christophe; Piechocki, Robert J.; McGeehan, Joe P.; Armour, Simon M.

    2003-01-01

    In this paper we address the problem of wide-band multiple-input multiple-output (MIMO) channel (multidimensional time invariant FIR filter) identification using Markov chains Monte Carlo methods. Towards this end we develop a novel stochastic sampling technique that produces a sequence of multidimensional channel samples. The method is semi-blind in the sense that it uses a very short training sequence. In such a framework the problem is no longer analytically tractable; hence we resort to s...

  1. Human Posture Identification Using a MIMO Array

    OpenAIRE

    Dai Sasakawa; Naoki Honma; Takeshi Nakayama; Shoichi Iizuka

    2018-01-01

    The elderly are constantly in danger of falling and injuring themselves without anyone realizing it. A safety-monitoring system based on microwaves can ease these concerns. The authors have proposed safety-monitoring systems that use multiple-input multiple-output (MIMO) radar to localize persons by capturing their biological activities such as respiration. However, our studies to date have focused on localization, which is easier to achieve than an estimation of human postures. This paper pr...

  2. Significant performance improvement obtained in a wireless mesh network using a beamswitching antenna

    CSIR Research Space (South Africa)

    Lysko, AA

    2012-09-01

    Full Text Available mesh network operated in a fixed 11 Mbps mode. The throughput improvement in multi-hop communication obtained in the presence of an interferer is tenfold, from 0.2 Mbps to 2 Mbps. Index Terms?antenna, smart antenna, wireless mesh network, WMN... efficiency in the communications, and active research and development of new methods and technologies enabling this at the physical layer, including multiple antenna techniques, such as multiple input multiple output (MIMO) and smart antennas...

  3. Extension and Prerequisite: An Algorithm to Enable Relations Between Responses in Chatbot Technology

    OpenAIRE

    Abbas S. Lokman; Jasni M. Zain

    2010-01-01

    Problem statement: Artificial intelligence chatbot is a technology that makes interactions between man and machines using natural language possible. From literature, we found out that in general, chatbot are functions like a typical search engine. Although chatbot just produced only one output instead of multiple outputs/results, the basic process flow is the same where each time an input is entered, the new search will be done. Nothing related to previous output. This research is focused on ...

  4. Trees and livestock together: silvopasture research and application for Virginia farms

    Science.gov (United States)

    Gregory E. Frey; John H. Fike; Adam K. Downing; Marcus M. Comer; Timothy A. Mize; Christopher D. Teutsch

    2017-01-01

    Silvopasture is the intentional combination of trees, forage, and livestock on a parcel of land to optimize multiple outputs and has been shown to have benefits for production in various parts of the world.  There is strong interest in silvopasture in the Southern United States, likely driven by multiple motivations.  However, silvopasture practices have not been...

  5. Physico-chemical changes of the ground waters related to the 2011 El Hierro magmatic reactivation

    Science.gov (United States)

    Dionis, S.; Melián, G.; Padrón, E.; Padilla, G.; Nolasco, D.; Rodríguez, F.; Hernández, I.; Peraza, D.; Barrancos, J.; Hernández, P.; Calvo, D.; Pérez, N.

    2012-04-01

    The island of El Hierro (278 Km2), is the smallest, the southwesternmost and the youngest island (˜1.12 My) of the Canarian archipelago. The main geological characteristics of El Hierro consist on the presence of three convergent ridges of volcanic cones on a truncated trihedron shape and giant landslides between the three rift zones, being the most recent El Golfo on the northwest flank of the island. On July 2011 an anomalous seismic activity at Hierro Island started and suggested the initial stage of a volcanic unrest in the volcanic system. On October 10, after the occurrence of more than 10,000 earthquakes, a submarine eruption started. Evidences of this submarine volcanic eruption were visible on the sea surface to the south of La Restinga village, at the south of the island, in the form of large light-green coloured area, turbulent gas emission and the appearance of steamy volcanic fragments three days later. As part of its volcanic surveillance activities, the Instituto Volcanologico de Canarias (INVOLCAN) started a hydrogeochemical monitoring program on August 2011 in order to evaluate the temporal evolution of several physico-chemical parameters of the ground water system of El Hierro. Four observation sites were selected: three wells on the north of the island, where the seismic activity was located at the beginning of the volcano-seismic unrest (SIMO, FRON and PADO) and one horizontal well (gallery) in the south (TACO). Ground water sampling is being regularly collected, three times per week, at each observation site, and in-situ measurements of pH, conductivity and temperature measurements are performed. After 6 month of monitoring, no significant changes have been observed on pH and temperature measurements from all the observation sites. However, clear sharp decrease of conductivity was observed at SIMO on October 10 when the seismic tremor started. In addition, the strongest conductivity decrease pattern was observed later on at SIMO and PADO on

  6. Estimation of the regional evapotranspiration through remote sensing

    International Nuclear Information System (INIS)

    Vives, L.; Rivas, R.; Wohl Coelho, O.; Schirmbeck, J.; Valor, E.

    2004-01-01

    This proposal deals with a new methodology capable of estimating variations in time and space of the evapotranspiration rate, which is one of the main processes controlling recharge to the Guarani Aquifer System (GAS). Such a methodology is being applied to the dos Sinos River Basin, Rio Grande do Sul, Brazil, which is in a region where groundwater from the GAS is heavily used for industrial and urban purposes. The investigations are being carried out by researchers of the Flat Plains Hydrology Institute (National University of the Center Buenos Aires Province, Azul, Argentina) and the Center of Exact and Technological Sciences (University of dos Simos River Valley, UNISINOS, Sao Leopoldo, Rio Grande do Sul, Brazil) [es

  7. María Soledad Catoggio, Los desaparecidos de la Iglesia. El clero contestatario frente a la dictadura

    OpenAIRE

    Crenzel, Emilio

    2017-01-01

    El libro de María Soledad Catoggio tiene por objetivo examinar las relaciones entre el catolicísimo argentino y la última dictadura militar, la represión en las filas del clero católico y las memorias que circulan en la Iglesia sobre sus víctimas. La obra se integra al campo de estudios de la historia reciente y la memoria social, el cual se encuentra en expansión en la Argentina, y que se focaliza en el proceso de radicalización, violencia política y represión estatal que atravesó el país en...

  8. Evaluation of herbicidal potential of depsides from Cladosporium uredinicola, an endophytic fungus found in Guava fruit

    International Nuclear Information System (INIS)

    Medeiros, Livia S. de; Sampaio, Olivia M.; Silva, Maria Fatima das G.F. da; Rodrigues Filho, Edson; Veiga, Thiago Andre M.

    2012-01-01

    Two natural products produced by Cladosporium uredinicola, an endophytic fungus isolated from guava fruit, were evaluated for their effects on photosynthesis. Both of them inhibited electron flow (basal, phosphorylating, and uncoupled) from water to methylviologen (MV), acting as Hill reaction inhibitors in freshly lysed spinach thylakoids. These polyketides, belonging to depsides class, inhibited partial reactions of photosystem II (PS II) electron flow from water to 2,5-dichloro-1,4-benzoquinone (DCBQ), from water to sodium silicomolybdate (SiMo Na + ), and partially inhibited electron flow from 1,5-diphenylcarbazide (DPC) to 2,6-dichloroindophenol (DCPIP). These results established that the depsides sites of inhibition are located on the donor and acceptor sides of PS II, between P680 and QA . Chlorophyll a fluorescence measurements corroborated this mechanism of action. None of the tested compounds inhibited photosystem I (PS I) electron transport. (author)

  9. Minerva y la reformulación de la masculinidad en "Cristalián de España" de Beatriz Bernal

    Directory of Open Access Journals (Sweden)

    Montserrat Piera

    2010-12-01

    Full Text Available In consonance with masculinist paradigms present in Arthurian romances, the knight is, generally, the doer, the agent, or the acting partner while the lady is fragile, passive and, therefore, does not engage in any action. This gendered reading, however, cannot be applied to the chivalresque novel Historia de los invictos y magnánimos caballeros don Cristalián de España, Príncipe de Trapisonda, y del Infante Lucescanio su hermano, hijos del famosísimo Emperador Lindedel de Trapisonda, published by Beatriz Bernal in Valladolid in 1545. This article explores the strategies used by the autor of this text to effect a refashioning of the chivalresque genre and to defy its generic roles.

  10. En el 416 aniversario de la fundación de Pamplona: Don Pedro de Orsua: el caballero de Eldorado

    Directory of Open Access Journals (Sweden)

    Santiago Pérez

    1965-11-01

    Full Text Available Fue el capitán Pedro de Orsua, ongmario de un antiquísimo poblado, que hoy por evolucion del vocablo se llama Ujué y que anteriormente se llamó Ursua, palabra que en Eúscaro quiere decir paloma. Dice la leyenda que en el siglo VIII, cuando las huestes árabes se habían desparramado por España y pugnaban por irrumpir en Francia, en un lugarejo del valle del Orba, en el partido de Olite, que pertenecía a la quinta merindad del reino de Navarra, había una cueva casi inaccesible en torno de la cual revoloteaba una paloma y que un zagal trepó entre las breñas y descubrió una imagen de la virgen, la que en razón de su alada compañera se llamó de Ursua.

  11. Apuntes para la historia del paludismo en Colombia

    Directory of Open Access Journals (Sweden)

    Facultad de Medicina Revista

    1943-08-01

    Full Text Available La Revista viene publicando trabajos sobre paludismo realizados últimamente, unos bajo los auspicios del Ministerio de Higiene y lso más, del Departamento Tropical de la Facultad de Medicina. En este mismo número aparece el interesante y utilísimo estudio "Biología y distribución geográfica de los mosquitos anofelinos de Colombia", hecho por el doctor Augusto Gast de la Sección de Estudios Especiales y uno de los médicos más enterados en el problema del paludismo. En desarrollo del tema y por sugestión del doctor Gast, apuntamos unos pocos datos que se nos vienen a la mente sobre tentativas de investigación y esbozos de lucha antipalúdica en Colombia.

  12. Effect of Difference-frequency Forces on the Dynamics of a Semi-submersible Type FVAWT in Misaligned Wave-wind Condition

    DEFF Research Database (Denmark)

    Wang, Kai; Cheng, Zhengshun; Moan, Torgeir

    2015-01-01

    With increasing interests in the development of offshore floating vertical axis wind turbines (FVAWTs), a large amount of studies on the FVAWTs have been conducted. This paper focuses on evaluating the effect of second-order difference-frequency force on the dynamics of a 5 MW FVAWT in misaligned...... wave-wind condition. The studied FVAWT is composed of a 5 MW Darrieus rotor, a semi-submersible floater and a catenary mooring system. Fully coupled nonlinear time domain simulations were conducted using the state-of-art code Simo- Riflex-DMS. Several misaligned wave-wind conditions were selected...... to investigate the global dynamic responses of the FVAWT, such as the platform motions, structural responses and mooring line tensions. It has been found that the wave-wind misalignment does not significantly affect the mean values of the global responses since the global responses are primarily wind...

  13. ¿Qué modelo de farmacia queremos?

    Directory of Open Access Journals (Sweden)

    Martínez Romero F.

    2013-03-01

    Full Text Available Al hilo de la presentación por el Ministerio de Economía y Competitividad del borrador de anteproyecto de Ley de Servicios Profesionales se reflexiona sobre el proyecto de Ley del año 1985 en el que se proponían una serie de cambios en la farmacia comunitaria española que provocaron una reacción casi unánime que llevó a la convocatoria de una “huelga a la japonesa” de amplísimo seguimiento. Algunas de aquellas propuestas forman parte hoy de la legislación vigente y otra parte son asumidas incluso como reivindicación por amplios sectores de la farmacia.

  14. Application of a novel PROMETHEE-based method for construction of a group compromise ranking to prioritization of green suppliers in food supply chain

    DEFF Research Database (Denmark)

    Govindan, Kannan; Kadziński, Miłosz; Sivakumar, R.

    2017-01-01

    green supply chain management (GSCM) elements is essential for utilizing the food supply chain in an environmentally benign way. As a solution to the above challenge, the economic and green characteristics for supplier selection in green purchasing are studied in this paper. For an organization......, the evaluation and selection of the green supplier is a vital issue due to several tangible and intangible criteria involved. Accordingly, we apply multiple criteria decision aiding techniques.We propose a hybrid approach that combines the revised Simos procedure, PROMETHEE methods, algorithms for constructing......The food sector has a prodigious focus and is constantly gaining in importance in today's global economic marketplace. Due to an increasing global population, society faces a greater challenge for sustainable food production, quality, distribution, and food safety in the food supply chain. Adopting...

  15. Discurso, gesto y comunicación en la liturgia visigoda (589-711

    Directory of Open Access Journals (Sweden)

    Eleonora Dell’Elicine

    2009-01-01

    Full Text Available « Tu nombre es aroma penetrante » (Ct 1, 3.Apenas comenzadas las actas del tercer concilio de Toledo de 589, los obispos allí reunidos establecieron solemnemente el siguiente artículo :« En reverencia a la santa fe, y para ayudar a las débiles inteligencias de los hombres, por indicación del píisimo y gloriosísimo señor y Rey Recaredo, estableció el santo concilio que en todas las iglesias de España, Galia y Galicia (… se recite el símbolo de la fe del Concilio de Constantinopla (…, para q...

  16. La vanguardia arquitectónica del Realismo Socialista: El discurso de Arkin

    Directory of Open Access Journals (Sweden)

    Carlos Flores Pazos

    2002-07-01

    Full Text Available En este artículo se intenta reivindicar el interés hacia un conjunto ingente, desconocido y variadísimo que en occidente se denomina de manera simplificada Arquitectura Stalinista, y que deberíamos denominar vanguardia del Realismo Socialista. Su calidad como conjunto, una vez superada la leyenda negra que lo acompaña y que es fruto, más del desconocimiento que de la realidad, con el tiempo será reconocida. Ciertos arquitectos de este periodo de transición, se adelantaron en sus críticas y en sus obras-manifiesto a lo que décadas más tarde llevaría a plantear obras como la Torre Velasca.

  17. Nuotolinio mokymo(si) elektroninės vizualinės terpės dizainas

    OpenAIRE

    Cygankova, Daiva

    2007-01-01

    Nuotolinio mokymo(si) dizainas kaip vizualios informacijos pateikimo forma atlieka svarbų vaidmenį naujos informacinės visuomenės kūrimesi, naujų, netradicinių mokymo(si) formų, būdų atsiradime, jų vystymosi procese. Dalyko mokytojo pamokos atsiranda elektroninės erdvės terpėje. Pedagogui rūpi kaip ir kokiais būdais pateikti tą informaciją, kad sėkmingai vyktų realus ir kokybiškas mokymo(si) procesas. ). Kūrėjui būtina įvertinti būsimo mokinio tiek poreikius, tiek aplinką, tiek tos aplinko...

  18. La Basílica de San Francisco de Asís después del terremoto del 26 de septiembre de 1997

    Directory of Open Access Journals (Sweden)

    Giorgio Croci

    1998-12-01

    Full Text Available La Basílica de San Francisco de Asís, gravemente dañada tras los primeros terremotos de otoño de 1997, amenazaba con un colapso completo a raíz del estado de difícil equilibrio en que había quedado. La intervención descrita en este artículo explica cómo se pudo consolidar el templo dañado en tiempo récord, poco antes de un seísmo fortísimo que habría provocado con seguridad el derrumbamiento de gran parte de su cubierta, con la grave pérdida que este hecho hubiera supuesto para el patrimonio arquitectónico y la historia del arte italiana.

  19. Presentación de las V Jornadas del Instituto de Inmunología Clínica

    Directory of Open Access Journals (Sweden)

    Guillermo Terán-Ángel

    2013-12-01

    Full Text Available La "V Jornada Científica del Instituto de Inmunología Clínica de la Universidad de los Andes" es un evento que se realiza en e l marco de la celebración de nuestro vigésimo aniversario de creación. En estas Jornadas se realizan actividades académicas de actualización (conferencias, presentación de trabajos libres, cursos y talleres prejornadas en el área de la inmunología y en general de las diferentes ramas de la biomedicina. Como eventos previos a las Jornadas se realizan dos cursos, el primero de clonación y producción de proteínas recombinantes seguido de un curso de inmunodiagnóstico . También se realiza un taller de manejo de infecciones recurrentes

  20. Estructura genética y simulaciones de máxima verosimilitud y Estadística Bayesiana aplicada a la conservación genética del Oso andino (Tremarctos ornatus en Venezuela, Colombia, Ecuador y Bolivia

    Directory of Open Access Journals (Sweden)

    M. Ruiz-García

    2001-07-01

    Full Text Available Se analizaron 115 muestras de oso andino procedentes de Venezuela, Colombia, Ecuador yBolivia mediante 5 microsatélites (G1A, G1D, G10B, G10C, G10M, G10P, G10X, UarMu 50,UarMu, 59. Se detectó: (1 No existencia de equilibrio Hardy-Weinberg en ninguna de laspoblaciones analizadas en cada uno de los países, lo que evidencia la existencia de efectoWahlund. (2 Los niveles de variabilidad genética fueron bajos (H=0.40, población total.Alarmantemente bajo fue el nivel de heterocigocidad en la población de Ecuador (H=0.27. (3Los niveles de flujo génico resultaron bajísimos (Nm=0.2-0.3.

  1. La «agnosia» del creyente

    Directory of Open Access Journals (Sweden)

    Gómez Caffarena, José

    2002-04-01

    Full Text Available Not available

    Agnosia, un término griego para ignorancia, fue usado por un cristiano del siglo V que tuvo gran influjo para caracterizar el modestísimo conocimiento (gnosis de Dios a que pueden aspirar los humanos. El creyente reflexivo actual recoge con sumo interés esa modestia y encuentra en ella la clave de una real cercanía con aquellos agnósticos actuales que siguen valorando la teología. Coinciden ambos en lo que saben (sobre el mundo y el hombre y en el interés por las cuestiones-límite; ante las que tienen convicciones (y actitudes diferentes.

  2. GIMFERRER: POESÍA Y CINE EN UN INSTANTE PLÁSTICO / Gimferrer: poetry and film in a plastic moment

    Directory of Open Access Journals (Sweden)

    Zoraida Sánchez Mateos

    2015-02-01

    Full Text Available El presente artículo pretende analizar las principales claves de la poesía de Pere Gimferrer a través del comentario de un poema de su libro La muerte en Beverly Hills. Este poemario es una clara muestra de la gran renovación poética que llevaron a término los Novísimos a finales de los años 60 en España. La incorporación de los nuevos medios de comunicación de masas a la poesía y su fusión con la alta cultura permitió dejar atrás los estrechos márgenes de la lírica social al indagar en los límites del lenguaje.

  3. Neural Network Control for the Linear Motion of a Spherical Mobile Robot

    Directory of Open Access Journals (Sweden)

    Yao Cai

    2011-09-01

    Full Text Available This paper discussed the stabilization and position tracking control of the linear motion of an underactuated spherical robot. By considering the actuator dynamics, a complete dynamic model of the robot is deduced, which is a complex third order, two variables nonlinear differential system and those two variables have strong coupling due to the mechanical structure of the robot. Different from traditional treatments, no linearization is applied to this system but a single‐input multiple‐output PID (SIMO_PID controller is designed by adopting a six‐input single‐ output CMAC_GBF (Cerebellar Model Articulation Controller with General Basis Function neural network to compensate the actuator nonlinearity and the credit assignment (CA learning method to obtain faster convergence of CMAC_GBF. The proposed controller is generalizable to other single‐input multiple‐output system with good real‐time capability. Simulations in Matlab are used to validate the control effects.

  4. Bibliofilia: sobre la incuria de algunos editores

    Directory of Open Access Journals (Sweden)

    Nelson Nicholls Santacoloma

    1982-10-01

    Full Text Available No hace muchos dias visitamos de nuevo a don Luis Villagómez y lo encontramos ocupado en una de las más desusadas diversiones que hubiéramos podido imaginar en él. Consistía ella en descubrir y anotar los errores tipográficos, trastrueques y aún gravísimas omisiones que del texto del Quijote aparecían a porrillo en una muy nueva edición de buen parecer que él habia adquirido hacia poco. Servíase para ello de muy bueno y fidelísimo patrón: la cuidada edición en cuatro tomos publicada por Rodolfo Schevill y Adolfo Bonilla (Madrid, Gráficas Reunidas S.A., años 1928, 1931, 1935 Y 1941.

  5. Honrosa visita

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    Revista Caldasia

    1943-08-01

    Full Text Available El 22 de abril visitaron el Instituto de Ciencias Naturales el Honorable Henry A. Wallace, Vicepresidente de los Estados Unidos de Norte América y el Excelentísimo señor doctor Alfonso López, Presidente de la Republica de Colombia, acompañados por S. E. el señor Arthur Bliss Lane, Embajador de los Estados Unidos en Bogotá, el doctor Rafael Parga Cortes, Ministro de la Educación Nacional, el doctor Julio Carrizosa Valenzuela, Rector de la Universidad Nacional, y otras personalidades muy distinguidas del cuerpo diplomático acreditado en Bogotá y de las esteras oficiales de nuestro país. / Cambio de Paginación de este Boletin.

  6. Evaluation of herbicidal potential of depsides from Cladosporium uredinicola, an endophytic fungus found in Guava fruit

    Energy Technology Data Exchange (ETDEWEB)

    Medeiros, Livia S. de; Sampaio, Olivia M.; Silva, Maria Fatima das G.F. da; Rodrigues Filho, Edson [Departamento de Quimica, Universidade Federal de Sao Carlos, SP (Brazil); Veiga, Thiago Andre M., E-mail: tveiga@unifesp.br [Instituto de Ciencias Ambientais, Quimicas e Farmaceuticas, Universidade Federal de Sao Paulo, Diadema, SP (Brazil)

    2012-08-15

    Two natural products produced by Cladosporium uredinicola, an endophytic fungus isolated from guava fruit, were evaluated for their effects on photosynthesis. Both of them inhibited electron flow (basal, phosphorylating, and uncoupled) from water to methylviologen (MV), acting as Hill reaction inhibitors in freshly lysed spinach thylakoids. These polyketides, belonging to depsides class, inhibited partial reactions of photosystem II (PS II) electron flow from water to 2,5-dichloro-1,4-benzoquinone (DCBQ), from water to sodium silicomolybdate (SiMo Na{sup +}), and partially inhibited electron flow from 1,5-diphenylcarbazide (DPC) to 2,6-dichloroindophenol (DCPIP). These results established that the depsides sites of inhibition are located on the donor and acceptor sides of PS II, between P680 and QA . Chlorophyll a fluorescence measurements corroborated this mechanism of action. None of the tested compounds inhibited photosystem I (PS I) electron transport. (author)

  7. La quinua

    Directory of Open Access Journals (Sweden)

    Alfonso Portilla

    1955-02-01

    Full Text Available La Revista de la Facultad con autorización del autor se honra en reproducir el capítulo sobre la quinua del importante libro "DIVULGACION DE CONOCIMIENTOS CIENTIFICOS SOBRE LAS PLANTAS MAS UTILES y CONOCIDAS EN COLOMBIA, SU VALOR ALIMENTICIO, MEDICINAL E INDUSTRIAL. Pasto 1951". El Dr. Portilla es médico graduado en nuestra escuela y ha ejercido su profesión en la ciudad de Pasto, tan propicia a las actividades del espíritu, con lujo de ciencia, conciencia y bondad. Para los estudiantes de medicina que ya no tienen el privilegio de los estudios de ciencias naturales singularmente la botánica de que sí disfrutaron las pasadas generaciones médicas, el libro del Doctor Portilla es recomendable por ser archivo y enciclopedia de utilísimos y variados conocimientos sobre las cosas de nuestra patria.

  8. Crystalline silicon films sputtered on molybdenum A study of the silicon-molybdenum interface

    Energy Technology Data Exchange (ETDEWEB)

    Reinig, P.; Fenske, F.; Fuhs, W.; Schoepke, A.; Selle, B

    2003-04-15

    Polycrystalline silicon films were grown on molybdenum (Mo)-coated substrates at high deposition rate using the pulsed magnetron sputtering technique. Our study investigates the silicon-molybdenum interface of these films to elucidate stimulating mechanisms for an ordered crystalline silicon thin film growth. Both Auger electron spectroscopy and Rutherford backscattering reveal that at a substrate temperature as low as T{sub S}=450 deg. C during the deposition process intermixing of Si and Mo at the Si-Mo interface takes place leading to a compositional ratio Mo:Si of about 1:2. By Raman spectroscopy hexagonal {beta}-MoSi{sub 2} could be identified as the dominant phase in this intermixed region. The dependence of the resulting thickness of the reacted interface layer on the deposition conditions is not fully understood yet.

  9. Crystalline silicon films sputtered on molybdenum A study of the silicon-molybdenum interface

    International Nuclear Information System (INIS)

    Reinig, P.; Fenske, F.; Fuhs, W.; Schoepke, A.; Selle, B.

    2003-01-01

    Polycrystalline silicon films were grown on molybdenum (Mo)-coated substrates at high deposition rate using the pulsed magnetron sputtering technique. Our study investigates the silicon-molybdenum interface of these films to elucidate stimulating mechanisms for an ordered crystalline silicon thin film growth. Both Auger electron spectroscopy and Rutherford backscattering reveal that at a substrate temperature as low as T S =450 deg. C during the deposition process intermixing of Si and Mo at the Si-Mo interface takes place leading to a compositional ratio Mo:Si of about 1:2. By Raman spectroscopy hexagonal β-MoSi 2 could be identified as the dominant phase in this intermixed region. The dependence of the resulting thickness of the reacted interface layer on the deposition conditions is not fully understood yet

  10. Potencial terapéutico de los canabinoides como neuroprotectores Therapeutical potential of cannabinoids as neuroprotective agents

    OpenAIRE

    Laymi Martínez García; Juan Enrique Tacoronte Morales; Yanier Nuñez Figueredo; Mayelin Montalbán; Hirán Ramón Cabrera Suárez

    2007-01-01

    La planta Cannabis sativa L. o cáñamo ha captado desde tiempos antiquísimos la atención del hombre en el campo de la salud y terapéutica humanas y todavía, a inicios del siglo XXI, continúa despertando polémicas en la comunidad científica como fuente natural y en el estudio y aplicación de sus derivados. Desde el punto de vista fitoquímico se han descrito más de 70 derivados de tipo canabinoide farmacológicamente activos sobre el sistema nervioso central. En la actualidad se han generado vali...

  11. Estudo sobre a aplicabilidade de adesivos biológicos à reinserção de músculo ocular externo em coelhos - II. Experimento II - Medida das distâncias das bordas nasal e temporal do músculo ao limbo e da extensão da adesão tecidual

    OpenAIRE

    Corrêa, Beatriz Simões; Bicas, Harley Edson Amaral

    2005-01-01

    OBJETIVO: Medir a extensão de aderências mioesclerais no quadragésimo dia de pós-operatório. MÉTODOS: Quinze coelhos da raça Nova Zelândia foram distribuídos em três grupos de cinco coelhos, submetidos à operação de desinserção do músculo reto superior de ambos os olhos, e reposicionamento no local da inserção original: o Grupo SP para o controle, sutura com fio de poliglactina 910 (Vicryl® 6-0), Grupo AF, adesivo de fibrina (Beriplast-P®), e Grupo AC, adesivo de cianoacrilato (Histoacryl®). ...

  12. Estudo sobre a aplicabilidade de adesivos biológicos à reinserção de músculo ocular externo em coelhos - II. Experimento II - Medida das distâncias das bordas nasal e temporal do músculo ao limbo e da extensão da adesão tecidual A study of the applicability of biological adhesives to the insertion of an external ocular muscle in rabbits - II. Experiment II - Measurement of the distances from the nasal and temporal muscles to the limbus and of the extent of tissue adhesion

    OpenAIRE

    Beatriz Simões Corrêa; Harley Edson Amaral Bicas

    2005-01-01

    OBJETIVO: Medir a extensão de aderências mioesclerais no quadragésimo dia de pós-operatório. MÉTODOS: Quinze coelhos da raça Nova Zelândia foram distribuídos em três grupos de cinco coelhos, submetidos à operação de desinserção do músculo reto superior de ambos os olhos, e reposicionamento no local da inserção original: o Grupo SP para o controle, sutura com fio de poliglactina 910 (Vicryl® 6-0), Grupo AF, adesivo de fibrina (Beriplast-P®), e Grupo AC, adesivo de cianoacrilato (Histoacryl®). ...

  13. Partial PIC-MRC Receiver Design for Single Carrier Block Transmission System over Multipath Fading Channels

    Directory of Open Access Journals (Sweden)

    Juinn-Horng Deng

    2012-01-01

    Full Text Available Single carrier block transmission (SCBT system has become one of the most popular modulation systems due to its low peak-to-average power ratio (PAPR, and it is gradually considered to be used for uplink wireless communication systems. In this paper, a low complexity partial parallel interference cancellation (PIC with maximum ratio combining (MRC technology is proposed to use for receiver to combat the intersymbol interference (ISI problem over multipath fading channel. With the aid of MRC scheme, the proposed partial PIC technique can effectively perform the interference cancellation and acquire the benefit of time diversity gain. Finally, the proposed system can be extended to use for multiple antenna systems to provide excellent performance. Simulation results reveal that the proposed low complexity partial PIC-MRC SIMO system can provide robust performance and outperform the conventional PIC and the iterative frequency domain decision feedback equalizer (FD-DFE systems over multipath fading channel environment.

  14. La educación popular en el pensamiento de Rafael María de Labra

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    Ulpiano VICENTE HERNÁNDEZ

    2010-03-01

    Full Text Available RESUMEN: Labra nació en La Habana, de padres asturianos, en 1840, y desde los 9 años vivió en Madrid, hasta su muerte en 1918. Hombre polifacético, destaca como jurista, político, publicista, orador, conferenciante. Escribe numerosísimos artículos en múltiples periódicos y revistas, libros, folletos y monografías de carácter político, social, científico y educativo. Funda y dirige varios pediódicos como La Tribuna, El Correo de España y El Correo de Ultrama

  15. Viscoplastic augmentation of the smooth cap model

    International Nuclear Information System (INIS)

    Schwer, Leonard E.

    1994-01-01

    The most common numerical viscoplastic implementations are formulations attributed to Perzyna. Although Perzyna-type algorithms are popular, they have several disadvantages relating to the lack of enforcement of the consistency condition in plasticity. The present work adapts a relatively unknown viscoplastic formulation attributed to Duvaut and Lions and generalized to multi-surface plasticity by Simo et al. The attraction of the Duvaut-Lions formulation is its ease of numerical implementation in existing elastoplastic algorithms. The present work provides a motivation for the Duvaut-Lions viscoplastic formulation, derivation of the algorithm and comparison with the Perzyna algorithm. A simple uniaxial strain numerical simulation is used to compare the results of the Duvaut-Lions algorithm, as adapted to the ppercase[dyna3d] smooth cap model with results from a Perzyna algorithm adapted by Katona and Muleret to an implicit code. ((orig.))

  16. Precisiones sobre un altar de la iglesia madrileña de las Comendadoras de Santiago

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    Jesús Ángel Sánchez Rivera

    2011-01-01

    Full Text Available Analizamos el altar del Santísimo Sacramento que se localiza en la iglesia de las Comendadoras de Santiago (Madrid, en cuya realización participaron diversos artistas: el arquitecto José Fernández Piedra, el pintor Jacinto Gómez Pastor y, acaso, uno de los hermanos Michel (Roberto y Pedro, o algún escultor de su círculo.We analyse the altar of the Saint Sacrament that it`s located in the church of the Comendadoras of Santiago (Madrid, in whose realisation several artists participated: the architect José Fernández Piedra, the painter Jacinto Gómez Pastor and, maybe, one of the Michel brothers (Roberto and Pedro, or some sculptor of his circle.

  17. Inorganic-organic hybrid polyoxometalate containing supramolecular helical chains: Preparation, characterization and application in chemically bulk-modified electrode

    International Nuclear Information System (INIS)

    Han Zhangang; Zhao Yulong; Peng Jun; Liu Qun; Wang Enbo

    2005-01-01

    An inorganic-organic hybrid polyoxometalate (POM) (Hbpy) 4 [SiMo 12 O 40 ] (1) (bpy = 2,4-bipyridine), has been prepared and characterized. X-ray diffraction study reveals that compound 1 contains interesting organic double helical chains. The hybrid nanoparticles was used as a solid bulkmodifier to fabricate a three-dimensional chemically modified carbon paste electrode (1-CPE) by direct mixing. The electrochemical behavior and electrocatalysis of 1-CPE has been studied in detail. The results indicate that 1-CPE has a good electrocatalytic activity toward the reduction of nitrite in 1 M H 2 SO 4 aqueous solution. 1-CPE shows remarkable stability that can be ascribed to the interactions existed between POM anions and organic double helical bpy chains, which are very important for practical applications in electrode modification

  18. Avatares del paradigma conexionista

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    Asier Arias

    2012-02-01

    Full Text Available Hace ahora un año que falleciera David Everett Rumelhart, conexionista pionero y editor junto con James Lloyd McClelland de la llamada “biblia del Procesamiento Distribuido en Paralelo” (PDP. Al mismo tiempo, los dos volúmenes de la referida biblia celebraban su vigésimo quinto cumpleaños. También uno de los padres de la inteligencia artificial, John McCarthy, que bautizara de hecho la disciplina, nos abandonó el pasado mes de octubre a los 84 años. Estas tres efemérides nos sirven de pretexto para un breve recorrido por las derivas y obstáculos a los que se ha enfrentado el llamado paradigma conexionista desde su puesta en escena como alternativa al cognitivismo clásico.

  19. POLÍTICA, ANTIFASCISMO Y MOVIMIENTO OBRERO. TUCUMÁN 1935 -1936

    Directory of Open Access Journals (Sweden)

    María Ullivarri

    2009-01-01

    Full Text Available El objetivo principal del artículo es explicar un proceso de movilización política y de lucha antifascista en la cual los sindicatos de la provincia de Tucumán ocuparon un rol nodal. En ese sentido, las consecuencias de esa disputa que se batió en el espacio público, dieron a la dirigencia sindical tucumana una visibilidad y un protagonismo que no habían conseguido hasta entonces y le permitió reforzar los vínculos y las solidaridades con otros sectores sociales. Para ello tomaremos como núcleo del análisis los problemas desencadenados en un brevísimo período a partir del cual los enfrentamientos públicos–tanto discursivos como físicos– entre fascismo y antifascismo adquirieron una virulencia significativa en la provincia: los años de 1935 y 1936.

  20. Ley sinde: sinfonía de un conflicto en la era digital

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    Albert García

    2011-06-01

    Full Text Available Ahora que ha pasado más de un mes desde el inesperado giro que sufrió la “Ley Sinde” durante su tramitación en el Senado, puede que haya llegado el momento de hacer balance de su dilatadísimo parto legal, así como de los procesos socio-políticos que lo han acompañado. Puede que Spielberg nunca adquiera los derechos para llevar a la gran pantalla esta contienda digital; puede que, siguiendo la lógica temporalmente atolondrada de la red, nadie componga nunca odas a estos hechos, pero hay ciertos fenómenos sociales que no pueden ser olvidados, que no deben serlo. Valga, pues, nuestro particular análisis de esta polifonía social a modo de síntesis, recordatorio y reflexión. Ocupen sus localidades, se abre el telón.

  1. Ley sinde: sinfonía de un conflicto en la era digital

    Directory of Open Access Journals (Sweden)

    Albert García

    2011-12-01

    Full Text Available Ahora que ha pasado más de un mes desde el inesperado giro que sufrió la “Ley Sinde” durante su tramitación en el Senado, puede que haya llegado el momento de hacer balance de su dilatadísimo parto legal, así como de los procesos socio-políticos que lo han acompañado. Puede que Spielberg nunca adquiera los derechos para llevar a la gran pantalla esta contienda digital; puede que, siguiendo la lógica temporalmente atolondrada de la red, nadie componga nunca odas a estos hechos, pero hay ciertos fenómenos sociales que no pueden ser olvidados, que no deben serlo. Valga, pues, nuestro particular análisis de esta polifonía social a modo de síntesis, recordatorio y reflexión. Ocupen sus localidades, se abre el telón.

  2. Extremely efficient crystallization of HKUST-1 and Keggin-loaded related phases through the epoxide route.

    Science.gov (United States)

    Oestreicher, Víctor; Jobbágy, Matías

    2017-03-25

    Highly crystalline HKUST-1 and COK-16-like phases were obtained based on a mild in situ alkalinization one-pot epoxide driven method. A slurry composed of finely ground trimesic acid, H 3 BTC, dispersed in a CuCl 2 aqueous solution quantitatively developed well crystallized HKUST-1 after the addition of propylene oxide. The use of solid H 3 BTC ensures a low concentration of free linker, favoring crystalline growth over the precipitation of amorphous or metastable impurities. An extreme space-time yield of 2.1 × 10 5 kg m -3 day -1 was reached, with no linker excess and minimum use of solvent. The method was equally efficient in the achievement of pure NENU/COK-16 phases, containing [PW 12 O 40 ] 3- , [PMo 12 O 40 ] 3- and [SiMo 12 O 40 ] 4- polyoxometalates.

  3. La música electroacústica de Gustavo Becerra (Homenaje a sus 80 años Gustavo Becerra: His Electronic Compositions

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    Federico Schumacher Ratti

    2007-06-01

    Full Text Available El distinguido compositor chileno Gustavo Becerra-Schmidt cumplió 80 años el 26 de agosto de 2005. Como un homenaje a su vigésimo octavo aniversario se escribió este artículo, dando cuenta de los aportes del Maestro en el campo de la música electroacústica a través de un breve análisis de sus creaciones en ese ámbito. Además, se elaboró un catálogo de sus obras electrónicasThis article has been written as a hommage to the distinguished Chilean composer Gustavo Becerra-Schmidt on his 80th birthday (August 26, 2005. It examines his creative output in the field of electronic music by means of an analytical survey of his main electronic compositions. A catalog of his electronic works is provided

  4. Los cuadros gerenciales en la administración pública: un segundo acercamiento sobre capacitación, formación y otras cuestiones

    Directory of Open Access Journals (Sweden)

    Rolando Bolaños Garita

    2011-01-01

    Full Text Available Los cuadros gerenciales pertenecientes a la Administración a la fecha no logran desempeñarse adecuadamente, sea por cuestiones de nombramiento político, formación académica, capacitación, actualización de conocimiento y(o desarrollo de competencias. No obstante, existe un altísimo nivel de responsabilidad en los desaciertos antes indicados, el cual debe ser endilgado directamente al ápice jerárquico gubernativo, por cuanto no se vislumbran ánimos o estrategias de orden técnico-legal por solventar la situación planteada, muy a pesar de que existe toda una gama de herramientas ya dispuestas para arribar a soluciones integrales, y más importante, de carácter totalmente autóctono.

  5. Poincaré, creador de los métodos todavía modernos en las ecuaciones diferenciales y en la mecánica celeste

    Directory of Open Access Journals (Sweden)

    Delshams i Valdés, Amadeu

    2004-08-01

    Full Text Available Con motivo del sesquicentenario del nacimiento de Henri Poincaré, resulta impresionante comprobar la influencia actual de su obra, así como el gran adelanto de sus métodos e ideas respecto a las de los científicos coetáneos. En esta conferencia se repasan algunas de sus contribuciones principales a las ecuaciones diferenciales y ala mecánica celeste, y se discute el papel central que tuvo en éstas su memoria sobre el problema de tres cuerpos presentada en 1889 a un concurso para conmemorar el sexagésimo aniversario del Rey Óscar II de Suecia y Noruega.…

  6. TERRA E SUA ASSOCIAÇÃO COM FERRO DEXTRAN NO DESEMPENHO DE LEITÕES EM ALEITAMENTO LAND AND ITS ASSOCIATION WITH IRON DEXTRAN IN THE PERFORMANCE OF PIGLETS

    Directory of Open Access Journals (Sweden)

    Sergito de Souza Cavalcanti

    2007-09-01

    Full Text Available

    Na central de Suínos de Goiás, no município de Senador Canedo, foi realizada esta pesquisa, onde se utilizou leitegada de quinze porcas Large White com a finalidade de se verificar o efeito da terra e de sua associação com ferro dextran no desempenho de leitões, aos 21 e 36 dias da idade. Os tratamentos utilizados foram os seguintes: T1 - 100 mg do ferro dextran via intramuscular no terceiro dia de vida dos leitões; T2 -50 mg de ferro dextran via intramuscular no terceiro dia de vida dos leitões mais 1,0 Kg de terra/dia do terceiro ao trigésimo quinto dia; T3 - 2,0 kg de terra/dia do terceiro ao trigésimo quinto dia de vida dos leitões. Observadas as condições em que foi realizado o experimento, conclui-se que: 1 a substituição de 50 mg de ferro dextran por 1,0 kg de terra/dia, do terceiro ao trigésimo quinto dia de vida dos leitões é tão eficiente quanto 100 mg de ferro dextran injetável intramuscularmente ao terceiro dia de vida; 2 o uso de 2,0 kg de terra diariamente do terceiro ao trigésimo quinto dia de vida dos leitões teve um desempenho inferior aos demais tratamentos.

    This research was developed in the Central Pig Farm in the county of Senador Canedo in Goiás State. Litters from 15 Large White sows were used to investigate the effect of feeding ground and its association with iron dextran to piglets from the third day of age. The evaluation of the effects of the treatments in the development of the piglets was done at 21 and 35 days of age. The treatments were as follow: T1 - 100 mg of iron dextran, via intramuscular, at the third day of age; T2 - 50 mg of iron dextran, via intramuscular, at the third day of age in association with 1.0 kg of ground, fed daily from the third to the 35th day of age; T3 - 2.0 kg of ground, daily, from the third to the 35th day of age. After observing

  7. A Low Cost Ferritic Stainless Steel Microalloyed by Higher Nb for Automotive Exhaust System

    Science.gov (United States)

    Chen, Erhu; Wang, Xuelin; Shang, Chengjia

    Automotive engine exhaust gas after combustion of fuel, and the gas will be liquefied in the rear of automotive exhaust system. A lot of corrosive anions existing in the condensate make corrosion of the exhaust system materials. Therefore, once pitting perforation, automotive exhaust system will fail directly. In 1980s, automotive exhaust manifold was made of Si-Mo ductile iron, mufflers and the tail pipe were made of carbon steel or aluminized steel. But with higher emission standards carried out, the improvement of engine performance and the higher exhaust temperature as well as the needs of the automotive light-weighting, we need the higher corrosion resistance of the material for automotive exhaust systems to meet the requirements.

  8. La Constitución de 1886

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    Boletín Cultural y Bibliográfico Banco de la República

    1984-01-01

    Full Text Available El cinco de agosto de 1986 Colombia entra en el reducidísimo grupo de países regidos por una constitución centenaria. Para estimular el estudio de la Carta Fundamental y conmemorar este acontecimiento, el Banco de la República adelanta una serie de proyectos en la perspectiva de ampliar la temática y profundizar los conocimientos logrados en cuestiones constitucionales: los antecedentes de la Constitución y de sus reformas; antología del pensamiento constitucional de los congresistas y constituyentes colombianos; la jurisprudencia constitucional de la Corte Suprema de Justicia y del Consejo de Estado; inventario bibliográfico de la documentación sobre la Constitución y sus reformas.

  9. Marco Denevi y sus "Falsificaciones"

    Directory of Open Access Journals (Sweden)

    David Lagmanovich

    2016-03-01

    Full Text Available Se estudia un libro del escritor argentino Marco Denevi: Falsificaciones (1966, constituido por textos brevísimos. La brevedad y el fragmentarismo, característica de esa escritura, no impiden descubrir los mecanismos de estructuración del libro. Se presta especial atención a las características de la escritura fragmentaria en detalle un "microrrelato". The book od Argentine writer Falsificaciones made up of extremely short texts is here subject of critical study. Briefness and fragmentation, characteristics of this type of writing, cannot entirely hide the mechanism of literary structuring. Special attention is given to the features of fragmentary writing and a detailed study of a micro story is provided.

  10. Actos de la Academia Nacional de Medicina

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    Facultad de Medicina Revista

    1942-09-01

    Full Text Available En la tarde del 20 de agosto celebró la Academia Nacional de Medicina sesión solemne para honrar la memoria del Profesor Eméritus de Patología General de la Facultad de Medicina, presidente que fué de la Academia, doctor Julio Manrique. Presidió el acto solemnísimo el Profesor Eméritus doctor José María Montoya. Hubo una selecta y nutrida concurrencia de damas y caballeros, invitados especialmente a la sesión. Hizo elogio del académico fallecido, el doctor Manuel Antonio Rueda Vargas, académico de número. La Academia resolvió, de conformidad con el artículo 6° de los reglamentos, designar para ocupar el sillón del lamentado profesor Manrique, al doctor Marco A. Iriarte, Profesor-Decano de la Facultad de Medicina.

  11. Opinión consultiva de la Corte Internacional de Justicia sobre la conformidad con el derecho internacional de la declaración unilateral de independencia relativa a Kosovo

    Directory of Open Access Journals (Sweden)

    Corte Internacional de Justicia

    2011-12-01

    Full Text Available 1. En la 22ª sesión plenaria de su sexagésimo tercer período de sesiones, celebrada el 8 de octubre de 2008, en su resolución 63/3 la Asamblea General decidió, de conformidad con el Artículo 96 de la Carta de las Naciones Unidas, solicitar a la Corte Internacional de Justicia que, en cumplimiento del Artículo 65 del Estatuto de la Corte, emitiera una opinión consultiva sobre la siguiente cuestión: “¿Se ajusta al derecho internacional la declaración unilateral de independencia formulada por las instituciones provisionales de autogobierno de Kosovo?”

  12. El museo deslumbrante - II

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    Fernando Arbeláez

    1964-06-01

    Full Text Available Es cierto que he venido para ver a Grecia, pero también es cierto que no es posible tratar de acercarse a ella, sin ir a esos desapacibles lugares que llamamos museos. Y hay todo un programa en Atenas: el Museo Arqueológico Nacional, el Museo Bizantino, el Museo Benaki, el Museo de Arte Popular, el Museo Etnológico, el Ágora y la Acrópolis. Esto en el centro de la ciudad, porque también existen sus riquísimos alrededores, las ruinas bizantinas, las modernas catedrales, Plaka y todos los barrio del norte con su espíritu y su encanto tan singulares. Además es necesario ir hasta el Pireo y gozar de su embrujo nocturno a más de visitar el famoso museo. He descifrado la dirección de un ómnibus : Eleusis.

  13. lnterculturalidad. Un desafío. Lima: Centro Amazónico de Antropología y Aplicación Práctica, 1992; 59 p.

    Directory of Open Access Journals (Sweden)

    Esperanza Daysi Kocchiu Yi

    1992-11-01

    Full Text Available Es en los últimos años que se ha planteado desde distintos sectores y especialidades a la INTERCULTURALIDAD como alternativa y desafío, es decir como dimensión a construir en el tejido de las relaciones humanas. En dicho sentido es que el trabajo titulado"INTERCULTURALIDAD. UN DESAFIO" realizado por un equipo interdisciplinar del Centro Amazónico de Antropología y Aplicación Práctica, formado por tres profesionales de las especialidades de Educación, Filosofía y Derecho, significa un valiosísimo esfuerzo por contribuir desde sus respectivas disciplinas tanto al análisis y esclarecimiento de dicho desafío, como a abrir un diálogo fructífero en tomo a tal reto.

  14. Linear systems optimal and robust control

    CERN Document Server

    Sinha, Alok

    2007-01-01

    Introduction Overview Contents of the Book State Space Description of a Linear System Transfer Function of a Single Input/Single Output (SISO) System State Space Realizations of a SISO System SISO Transfer Function from a State Space Realization Solution of State Space Equations Observability and Controllability of a SISO System Some Important Similarity Transformations Simultaneous Controllability and Observability Multiinput/Multioutput (MIMO) Systems State Space Realizations of a Transfer Function Matrix Controllability and Observability of a MIMO System Matrix-Fraction Description (MFD) MFD of a Transfer Function Matrix for the Minimal Order of a State Space Realization Controller Form Realization from a Right MFD Poles and Zeros of a MIMO Transfer Function Matrix Stability Analysis State Feedback Control and Optimization State Variable Feedback for a Single Input System Computation of State Feedback Gain Matrix for a Multiinput System State Feedback Gain Matrix for a Multi...

  15. Factores determinantes en la calidad del servicio sanitario en México: Caso ABC

    Directory of Open Access Journals (Sweden)

    Norma Angélica Pedraza-Melo

    2014-01-01

    Full Text Available El estudio tiene como objetivo identificar los factores determinantes en la calidad del servicio de salud desde la percepción del usuario en Tamaulipas, México. Se llevó a cabo mediante la estrategia de estudio de caso. Se aplicaron 120 cuestionarios a usuarios que voluntariamente decidieron participar. Para el análisis de fiabilidad de la escala se determinó el Alpha de Cronbach. Con base en el análisis factorial exploratorio se identificaron cinco factores que determinan la calidad de los servicios sanitarios en el hospital ABC. De acuerdo a la percepción de los usuarios, la calidad de los servicios en la unidad de análisis se categorizó en un nivel cercano a bueno en cuatro factores: trato al paciente y empatía, efectividad y oportunidad, tiempos de espera, seguridad y limpieza. Se identificó un factor, el de capacidad de respuesta, con la más baja valoración, en esta dimensión un porcentaje mayoritario (52.5% manifestó que el tiempo de espera en la consulta externa va de pésimo a regular; el 48.3 % de los usuarios calificó de nivel incipiente el servicio de urgencias; mientras que el 43.3% señaló que el tiempo de espera para las consultas de especialidad va de pésimo a regular. Al tratarse de un hospital certificado en estándares internacionales y con reconocimiento importante en su desempeño, los hallazgos del presente estudio evidencian áreas débiles en la prestación de los servicios sanitarios que ofrece.

  16. Fundar, gobernar y rezar: Una aproximación a los vínculos entre sociedad, política y religión en el Jujuy colonial (1656-1776 Fundar, governar e rezar: Uma aproximacão aos vinculos entre a sociedade, politica e religião da Jujuy colonial (1656-1776 To Fund, to Govern and to Pray: An Aproximation to the Links Between Society, Politics and Religion in Colonial Jujuy (1656-1776

    Directory of Open Access Journals (Sweden)

    Dolores Estruch

    2009-06-01

    Full Text Available El presente trabajo se propone analizar las relaciones entre religión, política y sociedad colonial, explorando la naturaleza de estos vínculos a partir de las prácticas concretas de los miembros de la cofradía del Santísimo Sacramento en el Jujuy colonial. Nos interesa, en particular, hacer foco en el proceso de construcción y legitimación del poder desde una perspectiva que contemple el entrelazamiento entre las dimensiones sociopolíticas y religiosas, propio de estas sociedades.O presente trabalho se propõe analisar as relações entre religião, política y sociedade colonial, explorando (pesquisando a natureza destas ligações (vinculações a partir das praticas concretas dos integrantes da cofraria do Santíssimo Sacramento no Jujuy colonial. Nós estamos interessados, em especial, fazer foco no processo de construção e legitimação do poder desde uma perspectiva que contemple este entrelaçamento entre as dimensões sociopolíticas e religiosas.This article analyzes the links between religion, politics and colonial society, and explores the nature of these relations in the concrete practices of the members of the Santísimo Sacramento brotherhood of colonial Jujuy. We focus on the process of construction and legitimation of power, from a perspective that takes into account the interconnections between the sociopolitical and religious dimensions.

  17. An investigation of dynamic subcarrier allocation in MIMO–OFDMA systems

    OpenAIRE

    Peng, Y; Armour, SMD; McGeehan, JP

    2007-01-01

    In this paper, orthogonal frequency-division multiple-access (OFDMA) systems with dynamic deterministic (as opposed to pseudorandom) allocation of subcarriers to users to exploit multiuser diversity are investigated. Previously published work on dynamic multiuser subcarrrier allocation for OFDMA systems with single-input-single-output (SISO) channels are surveyed. A near-optimal low-complexity algorithm for SISO systems, which is structurally similar to the algorithm by Rhee and Cioffi, is ex...

  18. Output Control Using Feedforward And Cascade Controllers

    Science.gov (United States)

    Seraji, Homayoun

    1990-01-01

    Report presents theoretical study of open-loop control elements in single-input, single-output linear system. Focus on output-control (servomechanism) problem, in which objective is to find control scheme that causes output to track certain command inputs and to reject certain disturbance inputs in steady state. Report closes with brief discussion of characteristics and relative merits of feedforward, cascade, and feedback controllers and combinations thereof.

  19. Pilot-model measurements of pilot responses in a lateral-directional control task

    Science.gov (United States)

    Adams, J. J.

    1976-01-01

    Pilot response during an aircraft bank-angle compensatory control task was measured by using an adaptive modeling technique. In the main control loop, which is the bank angle to aileron command loop, the pilot response was the same as that measured previously in single-input, single-output systems. The pilot used a rudder to aileron control coordination that canceled up to 80 percent of the vehicle yawing moment due to aileron deflection.

  20. Distributed Learning, Extremum Seeking, and Model-Free Optimization for the Resilient Coordination of Multi-Agent Adversarial Groups

    Science.gov (United States)

    2016-09-07

    and Technology, UK) OTHER MAJOR RECOGNITIONS 2016 Qian Ren Professor, Northeastern University, China 2015 Invitation Fellow, Japan Society for...Foroush and S. Martı́nez. On triggering control of single-input linear systems under pulse- width modulated DoS jamming attacks. SIAM Journal on...controllable linear systems under unknown periodic DoS jamming attacks. In SIAM Conference on Control and Its Applications (CT), pages 222–229, San Diego, CA

  1. Asymptotic Eigenstructures

    Science.gov (United States)

    Thompson, P. M.; Stein, G.

    1980-01-01

    The behavior of the closed loop eigenstructure of a linear system with output feedback is analyzed as a single parameter multiplying the feedback gain is varied. An algorithm is presented that computes the asymptotically infinite eigenstructure, and it is shown how a system with high gain, feedback decouples into single input, single output systems. Then a synthesis algorithm is presented which uses full state feedback to achieve a desired asymptotic eigenstructure.

  2. General model and control of an n rotor helicopter

    International Nuclear Information System (INIS)

    Sidea, A G; Brogaard, R Yding; Andersen, N A; Ravn, O

    2014-01-01

    The purpose of this study was to create a dynamic, nonlinear mathematical model of a multirotor that would be valid for different numbers of rotors. Furthermore, a set of Single Input Single Output (SISO) controllers were implemented for attitude control. Both model and controllers were tested experimentally on a quadcopter. Using the combined model and controllers, simple system simulation and control is possible, by replacing the physical values for the individual systems

  3. General model and control of an n rotor helicopter

    Science.gov (United States)

    Sidea, A. G.; Yding Brogaard, R.; Andersen, N. A.; Ravn, O.

    2014-12-01

    The purpose of this study was to create a dynamic, nonlinear mathematical model of a multirotor that would be valid for different numbers of rotors. Furthermore, a set of Single Input Single Output (SISO) controllers were implemented for attitude control. Both model and controllers were tested experimentally on a quadcopter. Using the combined model and controllers, simple system simulation and control is possible, by replacing the physical values for the individual systems.

  4. A representation theorem for linear discrete-space systems

    Directory of Open Access Journals (Sweden)

    Sandberg Irwin W.

    1998-01-01

    Full Text Available The cornerstone of the theory of discrete-time single-input single-output linear systems is the idea that every such system has an input–output map H that can be represented by a convolution or the familiar generalization of a convolution. This thinking involves an oversight which is corrected in this note by adding an additional term to the representation.

  5. Control desacoplado para bancos de ensayo para investigación en motores de combustión interna

    OpenAIRE

    López, José David; Espinosa, Jairo José; Agudelo, John

    2011-01-01

    This article presents a solid and robust automation model which has been developed and implemented in two different research engine test beds which were instrumented, one for diesel and the other one for spark ignition engines. The model, programmed in Matlab, is based on transfer functions with a decoupled (two single input single output systems) independent proportional and integral action controller that allows setting the desired engine speed and torque under stationary operation conditio...

  6. Design and fabrication of a traveling-wave muffin-tin accelerating structure at 90 GHz

    International Nuclear Information System (INIS)

    Chou, P.J.; Bowden, G.B.; Copeland, M.R.; Menegat, A.; Siemann, R.H.

    1997-05-01

    A prototype of a muffin-tin accelerating structure operating at 32 times the SLAC frequency (2.856 GHz) was built for research in high gradient acceleration. A traveling-wave design with single input and output feeds was chosen for the prototype which was fabricated by wire electrodischarge machining. Features of the mechanical design for the prototype are described. Design improvements are presented including considerations of cooling and vacuum

  7. pix2code: Generating Code from a Graphical User Interface Screenshot

    OpenAIRE

    Beltramelli, Tony

    2017-01-01

    Transforming a graphical user interface screenshot created by a designer into computer code is a typical task conducted by a developer in order to build customized software, websites, and mobile applications. In this paper, we show that deep learning methods can be leveraged to train a model end-to-end to automatically generate code from a single input image with over 77% of accuracy for three different platforms (i.e. iOS, Android and web-based technologies).

  8. A foundation for props, algebras, and modules

    CERN Document Server

    Yau, Donald

    2015-01-01

    PROPs and their variants are extremely general and powerful machines that encode operations with multiple inputs and multiple outputs. In this respect PROPs can be viewed as generalizations of operads that would allow only a single output. Variants of PROPs are important in several mathematical fields, including string topology, topological conformal field theory, homotopical algebra, deformation theory, Poisson geometry, and graph cohomology. The purpose of this monograph is to develop, in full technical detail, a unifying object called a generalized PROP. Then with an appropriate choice of p

  9. Relative Efficiency Indicators of the Credit Management Process in a Colombian Bank by Means of Data Envelopment Analysis (DEA)

    OpenAIRE

    Sánchez-Gooding, Sandra Paola; Universidad Nacional de Colombia; Rodríguez-Lozano, Gloria Isabel; Universidad Nacional de Colombia

    2017-01-01

    The purpose of this work is to measure the relative efficiency of the units that take part in the credit management process in a Colombian bank by means of the use of Data Envelopment Analysis (DEA). Using a doublé optimization process, this advanced linear programmingmethodology generates a single relative efficiency index for each one of the units being studied, although it is capable of including multiple resources and multiple outputs. In the bank that was used as the object of this study...

  10. Performance Characterization of a Real-Time Massive MIMO System with LOS Mobile Channels

    OpenAIRE

    Harris, Paul; Malkowsky, Steffen; Vieira, Joao; Hassan, Fredrik Tufvesson Wael Boukley; Liu, Liang; Beach, Mark; Armour, Simon; Edfors, Ove

    2017-01-01

    The first measured results for massive multiple input, multiple-output (MIMO) performance in a line-of-sight (LOS) scenario with moderate mobility are presented, with 8 users served in real-time using a 100 antenna base Station (BS) at 3.7 GHz. When such a large number of channels dynamically change, the inherent propagation and processing delay has a critical relationship with the rate of change, as the use of outdated channel information can result in severe detection and precoding inaccura...

  11. LOS Throughput Measurements in Real-Time with a 128-Antenna Massive MIMO Testbed

    OpenAIRE

    Harris, Paul; Zhang, Siming; Beach, Mark; Mellios, Evangelos; Nix, Andrew; Armour, Simon; Doufexi, Angela; Nieman, Karl; Kundargi, Nikhil

    2017-01-01

    This paper presents initial results for a novel 128-antenna massive Multiple-Input, Multiple- Output (MIMO) testbed developed through Bristol Is Open in collaboration with National Instruments and Lund University. We believe that the results presented here validate the adoption of massive MIMO as a key enabling technology for 5G and pave the way for further pragmatic research by the massive MIMO community. The testbed operates in real-time with a Long-Term Evolution (LTE)-like PHY in Time Div...

  12. Diversity Order Results for MIMO Optical Wireless Communications

    KAUST Repository

    Sapenov, Yerzhan; Chaaban, Anas; Rezki, Zouheir; Abdallah, Mohamed; Qaraqe, Khalid; Alouini, Mohamed-Slim

    2017-01-01

    An optical wireless multiple-input multiple-output (MIMO) communication system employing intensity-modulation direct-detection (IM/DD) is considered. The maximal diversity order of the channel is characterized by studying the outage probability. Then, spatial repetition coding (RC) is shown to be diversity-optimal as it achieves the channel’s maximal diversity order. This diversity order is given by a simple expression which is suitable for any channel statistics of practical interest. The results are specialized to some practical channel statistics, and numerical results are provided to verify the results.

  13. Robust Transceiver Design for Multiuser MIMO Downlink with Channel Uncertainties

    Science.gov (United States)

    Miao, Wei; Li, Yunzhou; Chen, Xiang; Zhou, Shidong; Wang, Jing

    This letter addresses the problem of robust transceiver design for the multiuser multiple-input-multiple-output (MIMO) downlink where the channel state information at the base station (BS) is imperfect. A stochastic approach which minimizes the expectation of the total mean square error (MSE) of the downlink conditioned on the channel estimates under a total transmit power constraint is adopted. The iterative algorithm reported in [2] is improved to handle the proposed robust optimization problem. Simulation results show that our proposed robust scheme effectively reduces the performance loss due to channel uncertainties and outperforms existing methods, especially when the channel errors of the users are different.

  14. A Parametric Learning and Identification Based Robust Iterative Learning Control for Time Varying Delay Systems

    Directory of Open Access Journals (Sweden)

    Lun Zhai

    2014-01-01

    Full Text Available A parametric learning based robust iterative learning control (ILC scheme is applied to the time varying delay multiple-input and multiple-output (MIMO linear systems. The convergence conditions are derived by using the H∞ and linear matrix inequality (LMI approaches, and the convergence speed is analyzed as well. A practical identification strategy is applied to optimize the learning laws and to improve the robustness and performance of the control system. Numerical simulations are illustrated to validate the above concepts.

  15. A Pilot-Pattern Based Algorithm for MIMO-OFDM Channel Estimation

    Directory of Open Access Journals (Sweden)

    Guomin Li

    2016-12-01

    Full Text Available An improved pilot pattern algorithm for facilitating the channel estimation in multiple input multiple output-orthogonal frequency division multiplexing (MIMO-OFDM systems is proposed in this paper. The presented algorithm reconfigures the parameter in the least square (LS algorithm, which belongs to the space-time block-coded (STBC category for channel estimation in pilot-based MIMO-OFDM system. Simulation results show that the algorithm has better performance in contrast to the classical single symbol scheme. In contrast to the double symbols scheme, the proposed algorithm can achieve nearly the same performance with only half of the complexity of the double symbols scheme.

  16. Modulation classification for MIMO systems: State of the art and research directions

    International Nuclear Information System (INIS)

    Bahloul, Mohammad Rida; Yusoff, Mohd Zuki; Abdel-Aty, Abdel-Haleem; Saad, M. Naufal M.; Al-Jemeli, Marwan

    2016-01-01

    Blind techniques and algorithms for Multiple-Input Multiple-Output (MIMO) signals interception have recently attracted a great deal of research efforts. This is due to their important applications in the military and civil telecommunications domains. One essential step in the signal interception process is to blindly recognize the modulation scheme of the MIMO signals. This process is formally called Modulation Classification (MC). This paper discusses the modulation classification for MIMO systems and presents a comprehensive and critical literature review of the existing MC algorithms for MIMO systems; where possible, gaps in the knowledge base are identified and future directions for the research work are suggested.

  17. Multiantenna systems for MIMO communications

    CERN Document Server

    DeFlaviis, Franco

    2008-01-01

    Advanced communication scenarios demand the development of new systemswhere antenna theory, channel propagation and communication models are seen from a common perspective as a way to understand and optimize the system as a whole. In this context, a comprehensive multiantenna formulation for multiple-input multiple-output systems is presented with a special emphasis on the connection of the electromagnetic and communication principles.Starting from the capacity for amultiantenna system, the book reviews radiation, propagation, and communicationmechanisms, paying particular attention to the vec

  18. Characterization of dual-polarization LTE radio over a free-space optical turbulence channel.

    Science.gov (United States)

    Bohata, J; Zvanovec, S; Korinek, T; Mansour Abadi, M; Ghassemlooy, Z

    2015-08-10

    A dual polarization (DP) radio over a free-space optical (FSO) communication link using a long-term evolution (LTE) radio signal is proposed and analyzed under different turbulence channel conditions. Radio signal transmission over the DP FSO channel is experimentally verified by means of error vector magnitude (EVM) statistics. We demonstrate that such a system, employing a 64 quadrature amplitude modulation at the frequency bands of 800 MHz and 2.6 GHz, evinces reliability with LTE signal over the FSO channel is a potential solution for last-mile access or backbone networks, when using multiple-input multiple-output based DP signals.

  19. Full-duplex MIMO system based on antenna cancellation technique

    DEFF Research Database (Denmark)

    Foroozanfard, Ehsan; Franek, Ondrej; Tatomirescu, Alexandru

    2014-01-01

    The performance of an antenna cancellation technique for a multiple-input– multiple-output (MIMO) full-duplex system that is based on null-steering beamforming and antenna polarization diversity is investigated. A practical implementation of a symmetric antenna topology comprising three dual......-polarized patch antennas operating at 2.4 GHz is described. The measurement results show an average of 60 dB self-interference cancellation over 200 MHz bandwidth. Moreover, a decoupling level of up to 22 dB is achieved for MIMO multiplexing using antenna polarization diversity. The performance evaluation...

  20. Performance Evaluation of Multicast Video Distribution using LTE-A in Vehicular Environments

    OpenAIRE

    Thota, Jayashree; Bulut, Berna; Doufexi, Angela; Armour, Simon; Nix, Andrew

    2017-01-01

    Application Layer Forward Error Correction (AL-FEC) based on Raptor codes has been employed in Multimedia Broadcast/Multicast Services (MBMS) to improve reliability. This paper considers a cross-layer system based on the latest Raptor Q codes for transmitting high data rate video. Multiple Input Multiple Output (MIMO) channels in a realistic outdoor environment for a user moving at 50kmph in an LTE-A system is considered. A link adaptation model with optimized cross-layer parameters is propos...

  1. Application of Bayesian Decision Theory Based on Prior Information in the Multi-Objective Optimization Problem

    Directory of Open Access Journals (Sweden)

    Xia Lei

    2010-12-01

    Full Text Available General multi-objective optimization methods are hard to obtain prior information, how to utilize prior information has been a challenge. This paper analyzes the characteristics of Bayesian decision-making based on maximum entropy principle and prior information, especially in case that how to effectively improve decision-making reliability in deficiency of reference samples. The paper exhibits effectiveness of the proposed method using the real application of multi-frequency offset estimation in distributed multiple-input multiple-output system. The simulation results demonstrate Bayesian decision-making based on prior information has better global searching capability when sampling data is deficient.

  2. Neural networks for sensor validation and plant monitoring

    International Nuclear Information System (INIS)

    Upadhyaya, B.R.; Eryurek, E.; Mathai, G.

    1990-01-01

    Sensor and process monitoring in power plants require the estimation of one or more process variables. Neural network paradigms are suitable for establishing general nonlinear relationships among a set of plant variables. Multiple-input multiple-output autoassociative networks can follow changes in plant-wide behavior. The backpropagation algorithm has been applied for training feedforward networks. A new and enhanced algorithm for training neural networks (BPN) has been developed and implemented in a VAX workstation. Operational data from the Experimental Breeder Reactor-II (EBR-II) have been used to study the performance of BPN. Several results of application to the EBR-II are presented

  3. Diversity Order Results for MIMO Optical Wireless Communications

    KAUST Repository

    Sapenov, Yerzhan

    2017-09-21

    An optical wireless multiple-input multiple-output (MIMO) communication system employing intensity-modulation direct-detection (IM/DD) is considered. The maximal diversity order of the channel is characterized by studying the outage probability. Then, spatial repetition coding (RC) is shown to be diversity-optimal as it achieves the channel’s maximal diversity order. This diversity order is given by a simple expression which is suitable for any channel statistics of practical interest. The results are specialized to some practical channel statistics, and numerical results are provided to verify the results.

  4. Modeling and Control of the Redundant Parallel Adjustment Mechanism on a Deployable Antenna Panel

    Directory of Open Access Journals (Sweden)

    Lili Tian

    2016-10-01

    Full Text Available With the aim of developing multiple input and multiple output (MIMO coupling systems with a redundant parallel adjustment mechanism on the deployable antenna panel, a structural control integrated design methodology is proposed in this paper. Firstly, the modal information from the finite element model of the structure of the antenna panel is extracted, and then the mathematical model is established with the Hamilton principle; Secondly, the discrete Linear Quadratic Regulator (LQR controller is added to the model in order to control the actuators and adjust the shape of the panel. Finally, the engineering practicality of the modeling and control method based on finite element analysis simulation is verified.

  5. A Fast Adaptive Receive Antenna Selection Method in MIMO System

    Directory of Open Access Journals (Sweden)

    Chaowei Wang

    2013-01-01

    Full Text Available Antenna selection has been regarded as an effective method to acquire the diversity benefits of multiple antennas while potentially reduce hardware costs. This paper focuses on receive antenna selection. According to the proportion between the numbers of total receive antennas and selected antennas and the influence of each antenna on system capacity, we propose a fast adaptive antenna selection algorithm for wireless multiple-input multiple-output (MIMO systems. Mathematical analysis and numerical results show that our algorithm significantly reduces the computational complexity and memory requirement and achieves considerable system capacity gain compared with the optimal selection technique in the same time.

  6. Reduction of snapshots for MIMO radar detection by block/group orthogonal matching pursuit

    KAUST Repository

    Ali, Hussain El Hosiny

    2014-10-01

    Multiple-input multiple-output (MIMO) radar works on the principle of transmission of independent waveforms at each element of its antenna array and is widely used for surveillance purposes. In this work, we investigate MIMO radar target localization problem with compressive sensing. Specifically, we try to solve the problem of estimation of target location in MIMO radar by group and block sparsity algorithms. It will lead us to a reduced number of snapshots required and also we can achieve better radar resolution. We will use group orthogonal matching pursuit (GOMP) and block orthogonal matching pursuit (BOMP) for our problem. © 2014 IEEE.

  7. Uplink multi-cluster scheduling with MU-MIMO for LTE-advanced with carrier aggregation

    DEFF Research Database (Denmark)

    Wang, Hua; Nguyen, Hung Tuan; Rosa, Claudio

    2012-01-01

    -Advanced requirements and are being considered as part of LTE Release 10. In this paper, some of the physical layer enhancement techniques for LTE-Advanced have been studied including carrier aggregation (CA), uplink multi-cluster scheduling, and uplink multi-user multiple-input multiple-output (MU-MIMO) transmission....... A system-level simulation was conducted to investigate the performance gains that can be achieved in uplink CA with multi-cluster scheduling and MU-MIMO. Simulation results show that with proper separation between power-limited and non-power-limited LTE-A users, multi-cluster scheduling with CA has similar...

  8. Radio resource management using geometric water-filling

    CERN Document Server

    He, Peter; Zhou, Sheng; Niu, Zhisheng

    2014-01-01

    This brief introduces the fundamental theory and development of managing radio resources using a water-filling algorithm that can optimize system performance in wireless communication. Geometric Water-Filling (GWF) is a crucial underlying tool in emerging communication systems such as multiple input multiple output systems, cognitive radio systems, and green communication systems. Early chapters introduce emerging wireless technologies and provide a detailed analysis of water-filling. The brief investigates single user and multi-user issues of radio resource management, allocation of resources

  9. Performance analysis of MIMO wireless optical communication system with Q-ary PPM over correlated log-normal fading channel

    Science.gov (United States)

    Wang, Huiqin; Wang, Xue; Lynette, Kibe; Cao, Minghua

    2018-06-01

    The performance of multiple-input multiple-output wireless optical communication systems that adopt Q-ary pulse position modulation over spatial correlated log-normal fading channel is analyzed in terms of its un-coded bit error rate and ergodic channel capacity. The analysis is based on the Wilkinson's method which approximates the distribution of a sum of correlated log-normal random variables to a log-normal random variable. The analytical and simulation results corroborate the increment of correlation coefficients among sub-channels lead to system performance degradation. Moreover, the receiver diversity has better performance in resistance of spatial correlation caused channel fading.

  10. Channel capacity of TDD-OFDM-MIMO for multiple access points in a wireless single-frequency-network

    DEFF Research Database (Denmark)

    Takatori, Y.; Fitzek, Frank; Tsunekawa, K.

    2005-01-01

    MIMO data transmission scheme, which combines Single-Frequency-Network (SFN) with TDD-OFDM-MIMO applied for wireless LAN networks. In our proposal, we advocate to use SFN for multiple access points (MAP) MIMO data transmission. The goal of this approach is to achieve very high channel capacity in both......The multiple-input-multiple-output (MIMO) technique is the most attractive candidate to improve the spectrum efficiency in the next generation wireless communication systems. However, the efficiency of MIMO techniques reduces in the line of sight (LOS) environments. In this paper, we propose a new...

  11. A Low-cost Multi-channel Analogue Signal Generator

    CERN Document Server

    Muller, F; Shen, W; Stamen, R

    2009-01-01

    A scalable multi-channel analogue signal generator is presented. It uses a commercial low-cost graphics card with multiple outputs in a standard PC as signal source. Each color signal serves as independent channel to generate an analogue signal. A custom-built external PCB was developed to adjust the graphics card output voltage levels for a specific task, which needed differential signals. The system furthermore comprises a software package to program the signal shape. The implementation of the signal generator is presented as well as an application where it was successfully utilized.

  12. A Low-cost Multi-channel Analogue Signal Generator

    CERN Document Server

    Müller, F; The ATLAS collaboration; Shen, W; Stamen, R

    2009-01-01

    A scalable multi-channel analogue signal generator is presented. It uses a commercial low-cost graphics card with multiple outputs in a standard PC as signal source. Each color signal serves as independent channel to generate an analogue signal. A custom-built external PCB was developed to adjust the graphics card output voltage levels for a specific task, which needed differential signals. The system furthermore comprises a software package to program the signal shape. The signal generator was successfully used as independent test bed for the ATLAS Level-1 Trigger Pre-Processor, providing up to 16 analogue signals.

  13. Switching power supplies with multiple isolated output and unitary power factor with an only switch; Fonte chaveada com multiplas saidas isoladas e fator de potencia unitario com um unico interruptor

    Energy Technology Data Exchange (ETDEWEB)

    Canesin, Carlos Alberto

    1990-09-01

    The analysis and implementation of switching power supplies with multiple output, through the use of the D C/D C Single Ended Primary Inductance Converter - SEPIC is presented. The structure has a single switch mode processing stage, improved input power factor, with the use of the variable current hysteresis control, or, constant on time control. The analysis of the D C/D C SEPIC, output characteristics and computer simulation is presented. A switching power supply practical design and experimental results are presented to demonstrate the validity of the theoretical analysis. (author)

  14. Productivity in Swedish electricity retail distribution

    International Nuclear Information System (INIS)

    Hjalmarsson, L.; Veiderpass, A.

    1992-01-01

    This paper examines productivity growth in electricity retail distribution in Sweden in a multiple output-multiple input framework. The approach used is nonparametric Data Envelopment Analysis (DEA). Productivity is measured by means of the Malmquist index. Productivity comparisons are made between different types of ownership and between different service areas. The study indicates a high rate of productivity growth, due to economics of density, when measured over a period of 17 years. The results show no significant differences in productivity growth between different types of ownership or economic organization. (20 refs., 1 fig., 4 tabs.)

  15. Sum Rate Maximization using Linear Precoding and Decoding in the Multiuser MIMO Downlink

    OpenAIRE

    Tenenbaum, Adam J.; Adve, Raviraj S.

    2008-01-01

    We propose an algorithm to maximize the instantaneous sum data rate transmitted by a base station in the downlink of a multiuser multiple-input, multiple-output system. The transmitter and the receivers may each be equipped with multiple antennas and each user may receive more than one data stream. We show that maximizing the sum rate is closely linked to minimizing the product of mean squared errors (PMSE). The algorithm employs an uplink/downlink duality to iteratively design transmit-recei...

  16. Factorization properties of the optimal signaling distribution of multi-dimensional QAM constellations

    DEFF Research Database (Denmark)

    Yankov, Metodi Plamenov; Forchhammer, Søren; Larsen, Knud J.

    2014-01-01

    In this work we study the properties of the optimal Proba- bility Mass Function (PMF) of a discrete input to a general Multiple Input Multiple Output (MIMO) channel. We prove that when the input constellation is constructed as a Cartesian product of 1-dimensional constellations, the optimal PMF...... factorizes into the product of the marginal 1D PMFs. This confirms the conjecture made in [1], which allows for optimizing the input PMF efficiently when the rank of the MIMO channel grows. The proof is built upon the iterative Blahut-Arimoto algorithm. We show that if the initial PMF is factorized, the PMF...

  17. A Genetic Algorithm-based Antenna Selection Approach for Large-but-Finite MIMO Networks

    KAUST Repository

    Makki, Behrooz

    2016-12-29

    We study the performance of antenna selectionbased multiple-input-multiple-output (MIMO) networks with large but finite number of transmit antennas and receivers. Considering the continuous and bursty communication scenarios with different users’ data request probabilities, we develop an efficient antenna selection scheme using genetic algorithms (GA). As demonstrated, the proposed algorithm is generic in the sense that it can be used in the cases with different objective functions, precoding methods, levels of available channel state information and channel models. Our results show that the proposed GAbased algorithm reaches (almost) the same throughput as the exhaustive search-based optimal approach, with substantially less implementation complexity.

  18. Joint compensation of multiple RF impairments in MIMO STBC systems

    KAUST Repository

    Qi, Jian

    2011-09-01

    In this paper, we propose a compensation method for the joint effect of high-power amplifier (HPA) nonlinearity, in-phase/quadrature-phase (I/Q) imbalance and crosstalk in multiple-input multiple-output (MIMO) orthogonal space-time block coding (OSTBC) systems. The performance of the MIMO OSTBC equipped with the proposed compensation mechanism is evaluated in terms of average symbol error probability and system capacity, in Rayleigh fading channels. Numerical results are provided and show the effects on performance of several system parameters, namely, the HPA parameters, image-leakage ratio, crosstalk, numbers of antennas, and phase-shift keying modulation order. © 2011 IEEE.

  19. Optimization of Training Signal Transmission for Estimating MIMO Channel under Antenna Mutual Coupling Conditions

    Directory of Open Access Journals (Sweden)

    Xia Liu

    2010-01-01

    Full Text Available This paper reports investigations on the effect of antenna mutual coupling on performance of training-based Multiple-Input Multiple-Output (MIMO channel estimation. The influence of mutual coupling is assessed for two training-based channel estimation methods, Scaled Least Square (SLS and Minimum Mean Square Error (MMSE. It is shown that the accuracy of MIMO channel estimation is governed by the sum of eigenvalues of channel correlation matrix which in turn is influenced by the mutual coupling in transmitting and receiving array antennas. A water-filling-based procedure is proposed to optimize the training signal transmission to minimize the MIMO channel estimation errors.

  20. MIMO channel capacity versus mutual coupling in multi antenna element system

    DEFF Research Database (Denmark)

    Thaysen, Jesper; Jakobsen, Kaj Bjarne

    2004-01-01

    In this paper the influence of mutual coupling on the capacity of a multiple-input multiple-output (MIMO) antenna system is demonstrated. No direct relation between the envelope correlation and the actual location and orientation of the antennas is found. Even though being essential for high MIMO...... capacity, configurations with the lowest envelope correlations are not necessarily the most suitable for a MIMO system. A certain bandwidth is required as well. Three planar inverted F-antennas (PIFA) located on the same 40 mm x 100 mm ground plane. The antennas that haves a resonant frequency of 1.8 GHz...

  1. Analysis of Paper reduction schemes to develop selection criteria for ofdm signals

    International Nuclear Information System (INIS)

    Abro, F.R.

    2015-01-01

    This paper presents a review of different PAPR (Peak to Average Power Ratio) reduction schemes of OFDM (Orthogonal Frequency Division Multiplexing) signals. The schemes that have been considered include Clipping and Filtering, Coding, ACE (Active Contstellation Extension), SLM (Selected Mapping), PTS (Partial Transmit Sequence), TI (Tone Injection) and TR (Tone Reservation). A comparative analysis has been carried out qualitatively. It has been demonstrated how these schemes can be combined with MIMO (Multiple Input Multiple Output) technologies. Finally, criteria for selection of PAPR reduction schemes of OFDM systems are discussed. (author)

  2. Performance comparison of weighted sum-minimum mean square error and virtual signal-to-interference plus noise ratio algorithms in simulated and measured channels

    DEFF Research Database (Denmark)

    Rahimi, Maryam; Nielsen, Jesper Ødum; Pedersen, Troels

    2014-01-01

    A comparison in data achievement between two well-known algorithms with simulated and real measured data is presented. The algorithms maximise the data rate in cooperative base stations (BS) multiple-input-single-output scenario. Weighted sum-minimum mean square error algorithm could be used...... in multiple-input-multiple-output scenarios, but it has lower performance than virtual signal-to-interference plus noise ratio algorithm in theory and practice. A real measurement environment consisting of two BS and two users have been studied to evaluate the simulation results....

  3. Near-Optimal Detection in MIMO Systems using Gibbs Sampling

    DEFF Research Database (Denmark)

    Hansen, Morten; Hassibi, Babak; Dimakis, Georgios Alexandros

    2009-01-01

    In this paper we study a Markov Chain Monte Carlo (MCMC) Gibbs sampler for solving the integer least-squares problem. In digital communication the problem is equivalent to preforming Maximum Likelihood (ML) detection in Multiple-Input Multiple-Output (MIMO) systems. While the use of MCMC methods...... sampler provides a computationally efficient way of achieving approximative ML detection in MIMO systems having a huge number of transmit and receive dimensions. In fact, they further suggest that the Markov chain is rapidly mixing. Thus, it has been observed that even in cases were ML detection using, e...

  4. Indoor MIMO Channel Measurement and Modeling

    DEFF Research Database (Denmark)

    Nielsen, Jesper Ødum; Andersen, Jørgen Bach

    2005-01-01

    Forming accurate models of the multiple input multiple output (MIMO) channel is essential both for simulation as well as understanding of the basic properties of the channel. This paper investigates different known models using measurements obtained with a 16x32 MIMO channel sounder for the 5.8GHz...... band. The measurements were carried out in various indoor scenarios including both temporal and spatial aspects of channel changes. The models considered include the so-called Kronecker model, a model proposed by Weichselberger et. al., and a model involving the full covariance matrix, the most...

  5. A Genetic Algorithm-based Antenna Selection Approach for Large-but-Finite MIMO Networks

    KAUST Repository

    Makki, Behrooz; Ide, Anatole; Svensson, Tommy; Eriksson, Thomas; Alouini, Mohamed-Slim

    2016-01-01

    We study the performance of antenna selectionbased multiple-input-multiple-output (MIMO) networks with large but finite number of transmit antennas and receivers. Considering the continuous and bursty communication scenarios with different users’ data request probabilities, we develop an efficient antenna selection scheme using genetic algorithms (GA). As demonstrated, the proposed algorithm is generic in the sense that it can be used in the cases with different objective functions, precoding methods, levels of available channel state information and channel models. Our results show that the proposed GAbased algorithm reaches (almost) the same throughput as the exhaustive search-based optimal approach, with substantially less implementation complexity.

  6. Note: A high dynamic range, linear response transimpedance amplifier.

    Science.gov (United States)

    Eckel, S; Sushkov, A O; Lamoreaux, S K

    2012-02-01

    We have built a high dynamic range (nine decade) transimpedance amplifier with a linear response. The amplifier uses junction-gate field effect transistors (JFETs) to switch between three different resistors in the feedback of a low input bias current operational amplifier. This allows for the creation of multiple outputs, each with a linear response and a different transimpedance gain. The overall bandwidth of the transimpedance amplifier is set by the bandwidth of the most sensitive range. For our application, we demonstrate a three-stage amplifier with transimpedance gains of approximately 10(9)Ω, 3 × 10(7)Ω, and 10(4)Ω with a bandwidth of 100 Hz.

  7. Immune Algorithm Complex Method for Transducer Calibration

    Directory of Open Access Journals (Sweden)

    YU Jiangming

    2014-08-01

    Full Text Available As a key link in engineering test tasks, the transducer calibration has significant influence on accuracy and reliability of test results. Because of unknown and complex nonlinear characteristics, conventional method can’t achieve satisfactory accuracy. An Immune algorithm complex modeling approach is proposed, and the simulated studies on the calibration of third multiple output transducers is made respectively by use of the developed complex modeling. The simulated and experimental results show that the Immune algorithm complex modeling approach can improve significantly calibration precision comparison with traditional calibration methods.

  8. A technology mapping based on graph of excitations and outputs for finite state machines

    Science.gov (United States)

    Kania, Dariusz; Kulisz, Józef

    2017-11-01

    A new, efficient technology mapping method of FSMs, dedicated for PAL-based PLDs is proposed. The essence of the method consists in searching for the minimal set of PAL-based logic blocks that cover a set of multiple-output implicants describing the transition and output functions of an FSM. The method is based on a new concept of graph: the Graph of Excitations and Outputs. The proposed algorithm was tested using the FSM benchmarks. The obtained results were compared with the classical technology mapping of FSM.

  9. Tumor Immunotherapy by Gene-circuit Recruited Immunomodulatory Systems (TIGRIS) for Prostate Cancer

    Science.gov (United States)

    2017-09-01

    Commercial Assays CytoTox 96 Non-Radioactive Cytotoxicity Assay Kit Promega Cat #G1780 Human IFN-g DuoSet ELISA R&D systems Cat #DY285 Human CCL21/6Ckine...DuoSet ELISA R&D systems Cat #DY366 Human IL-12 p70 DuoSet ELISA R&D systems Cat #DY1270 Cell Culture Reagents DMEM Life Technologies Cat #10569-044...after 24h and IFN-g concentration determined by Human IFN-g DuoSet ELISA (R&D systems, Min- neapolis, MN; catalog #DY285). Multiple-Output Circuit

  10. A comparison of cost-based pricing rules for natural gas distribution utilities

    International Nuclear Information System (INIS)

    Klein, C.C.

    1993-01-01

    Partial-equilibrium social welfare deadweight losses under uniform Ramsey pricing, a cost allocation pricing method, and the actual average revenues by customer class for two natural gas distribution utilities are calculated and compared. Marginal cost estimates are derived from a multiple-output translog variable cost function and used, along with three sets of demand elasticities, to generate the Ramsey prices and welfare losses. The actual and cost-allocation prices are taken directly from rate case files. The largest social welfare losses are associated with the cost-allocation rule, as high as 10-25% of revenue, despite suggestions in the literature to the contrary. (Author)

  11. Sum-rate analysis of spectrum sharing spatial multiplexing MIMO systems with zero-forcing and multiuser diversity

    KAUST Repository

    Yang, Liang

    2013-06-01

    This paper considers a multiuser spectrum sharing (SS) multiple-input multiple-output (MIMO) system with zero-forcing (ZF) operating in a Rayleigh fading environment. We provide an asymptotic sum-rate analysis to investigate the effects of different parameters on the multiuser diversity gain. For a ZF SS spatial multiplexing system with scheduling, the asymptotic sum-rate scales like Nt log2(Q(Nt Np√K - 1)/N t), where Np denotes the number of antennas of primary receiver, Q is the interference temperature, and K represents the number of secondary transmitters. © 2013 IEEE.

  12. New insights into the stochastic ray production frontier

    DEFF Research Database (Denmark)

    Henningsen, Arne; Bělín, Matěj; Henningsen, Géraldine

    The stochastic ray production frontier was developed as an alternative to the traditional output distance function to model production processes with multiple inputs and multiple outputs. Its main advantage over the traditional approach is that it can be used when some output quantities of some o...... important than the existing criticisms: taking logarithms of the polar coordinate angles, non-invariance to units of measurement, and ordering of the outputs. We also give some practical advice on how to address the newly raised issues....

  13. New insights into the stochastic ray production frontier

    DEFF Research Database (Denmark)

    Henningsen, Arne; Bělín, Matěj; Henningsen, Geraldine

    2017-01-01

    The stochastic ray production frontier was developed as an alternative to the traditional output distance function to model production processes with multiple inputs and multiple outputs. Its main advantage over the traditional approach is that it can be used when some output quantities of some o...... important than the existing criticisms: taking logarithms of the polar coordinate angles, non-invariance to units of measurement, and ordering of the outputs. We also give some practical advice on how to address the newly raised issues....

  14. A polarization-division multiplexing SSB-OFDM system with beat interference cancellation receivers

    Science.gov (United States)

    Yang, Peiling; Ma, Jianxin; Zhang, Junyi

    2018-06-01

    In this paper, we have proposed a polarization-division multiplexing (PDM) single-sideband optical orthogonal frequency division multiplexing (SSB-OOFDM) scheme with signal-signal beat interference cancellation receivers with balanced detection (ICRBD). This system can double channel capacity and improve spectrum efficiency (SE) with the reduced guard band (GB) due to the PDM. Multiple input multiple output (MIMO) technique is used to solve polarization mode dispersion (PMD) associated with channel estimation and equalization. By simulation, we demonstrate the efficacy of the proposed technique for a 2 ×40 Gbit/s 16-QAM SSB-PDM-OOFDM system according to the error vector magnitude (EVM) and the constellation diagrams.

  15. Integrated-optic current sensors with a multimode interference waveguide device.

    Science.gov (United States)

    Kim, Sung-Moon; Chu, Woo-Sung; Kim, Sang-Guk; Oh, Min-Cheol

    2016-04-04

    Optical current sensors based on polarization-rotated reflection interferometry are demonstrated using polymeric integrated optics and various functional optical waveguide devices. Interferometric sensors normally require bias feedback control for maintaining the operating point, which increases the cost. In order to resolve this constraint of feedback control, a multimode interference (MMI) waveguide device is integrated onto the current-sensor optical chip in this work. From the multiple outputs of the MMI, a 90° phase-shifted transfer function is obtained. Using passive quadrature demodulation, we demonstrate that the sensor could maintain the output signal regardless of the drift in the operating bias-point.

  16. Construction and Capacity Analysis of High-Rank LoS MIMO Channels in High Speed Railway Scenarios

    Directory of Open Access Journals (Sweden)

    Jingya Yang

    2012-01-01

    Full Text Available The validity of the maximum capacity criterion applied to realize high-rank line-of-sight (LoS multiple-input multiple-output (MIMO channels is investigated for high speed railway scenarios. Performance is evaluated by ergodic capacity. Numerical results demonstrate that by simply adjusting antenna spacing according to the maximum capacity criterion, significant capacity gains are achievable. We find relatively low sensitivity of the system to displacements from the optimal point and angle in relatively short range. Thus, we present two proposals to reconfigure antenna arrays so as to maximize LoS MIMO capacity in the high speed railway scenarios

  17. MIMO Beamforming for Secure and Energy-Efficient Wireless Communication

    Science.gov (United States)

    Nghia, Nguyen T.; Tuan, Hoang D.; Duong, Trung Q.; Poor, H. Vincent

    2017-02-01

    Considering a multiple-user multiple-input multiple-output (MIMO) channel with an eavesdropper, this letter develops a beamformer design to optimize the energy efficiency in terms of secrecy bits per Joule under secrecy quality-of-service constraints. This is a very difficult design problem with no available exact solution techniques. A path-following procedure, which iteratively improves its feasible points by using a simple quadratic program of moderate dimension, is proposed. Under any fixed computational tolerance the procedure terminates after finitely many iterations, yielding at least a locally optimal solution. Simulation results show the superior performance of the obtained algorithm over other existing methods.

  18. Approximating the constellation constrained capacity of the MIMO channel with discrete input

    DEFF Research Database (Denmark)

    Yankov, Metodi Plamenov; Forchhammer, Søren; Larsen, Knud J.

    2015-01-01

    In this paper the capacity of a Multiple Input Multiple Output (MIMO) channel is considered, subject to average power constraint, for multi-dimensional discrete input, in the case when no channel state information is available at the transmitter. We prove that when the constellation size grows, t...... for the equivalent orthogonal channel, obtained by the singular value decomposition. Furthermore, lower bounds on the constrained capacity are derived for the cases of square and tall MIMO matrix, by optimizing the constellation for the equivalent channel, obtained by QR decomposition....

  19. On end-to-end performance of MIMO multiuser in cognitive radio networks

    KAUST Repository

    Yang, Yuli

    2011-12-01

    In this paper, a design for the multiple-input-multiple-output (MIMO) multiuser transmission in the cognitive radio network is developed and its end-to-end performance is investigated under spectrum-sharing constraints. Firstly, the overall average packet error rate is analyzed by considering the channel state information feedback delay and the multiuser scheduling. Then, we provide corresponding numerical results to measure the performance evaluation for several separate scenarios, which presents a convenient tool for the cognitive radio network design with multiple secondary MIMO users. © 2011 IEEE.

  20. Designs of precoding for LTE TDD using cell specific reference signals

    DEFF Research Database (Denmark)

    Sun, Fan; Lu, Lu; Sørensen, Troels Bundgaard

    2010-01-01

    We design non-codebook-based Multiple-Input Multiple-Output (MIMO) precoding schemes using multiple cell-specific reference signals patterns for the time division duplex (TDD) mode of LTE, where channel reciprocity can be exploited. Previously proposed non-codebookbased precoding schemes typically...... use UE specific reference signals for demodulation. Cell specific reference signals are however always allocated for the transmission of common control signalling, mobility measurements and downlink channel quality measurements. In order to save the resources occupied by UE specific reference signals...

  1. Left-handed compact MIMO antenna array based on wire spiral resonator for 5-GHz wireless applications

    Science.gov (United States)

    Alqadami, Abdulrahman Shueai Mohsen; Jamlos, Mohd Faizal; Soh, Ping Jack; Rahim, Sharul Kamal Abdul; Narbudowicz, Adam

    2017-01-01

    A compact coplanar waveguide-fed multiple-input multiple-output antenna array based on the left-handed wire loaded spiral resonators (SR) is presented. The proposed antenna consists of a 2 × 2 wire SR with two symmetrical microstrip feed lines, each line exciting a 1 × 2 wire SR. Left-handed metamaterial unit cells are placed on its reverse side and arranged in a 2 × 3 array. A reflection coefficient of less than -16 dB and mutual coupling of less than -28 dB are achieved at 5.15 GHz WLAN band.

  2. On end-to-end performance of MIMO multiuser in cognitive radio networks

    KAUST Repository

    Yang, Yuli; Aissa, Sonia

    2011-01-01

    In this paper, a design for the multiple-input-multiple-output (MIMO) multiuser transmission in the cognitive radio network is developed and its end-to-end performance is investigated under spectrum-sharing constraints. Firstly, the overall average packet error rate is analyzed by considering the channel state information feedback delay and the multiuser scheduling. Then, we provide corresponding numerical results to measure the performance evaluation for several separate scenarios, which presents a convenient tool for the cognitive radio network design with multiple secondary MIMO users. © 2011 IEEE.

  3. Multi-user MIMO and carrier aggregation in 4G systems

    DEFF Research Database (Denmark)

    Cattoni, Andrea Fabio; Nguyen, Hung Tuan; Duplicy, Jonathan

    2012-01-01

    The market success of broadband multimediaenabled devices such as smart phones, tablets, and laptops is increasing the demand for wireless data capacity in mobile cellular systems. In order to meet such requirements, the introduction of advanced techniques for increasing the efficiency in spectrum...... usage was required. Multi User -Multiple Input Multiple Output (MU-MIMO) and Carrier Aggregation (CA) are two important techniques addressed by 3GPP for LTE and LTE-Advanced. The aim of the EU FP7 project on ”Spectrum Aggregation and Multiuser-MIMO: real-World Impact” (SAMURAI) is to investigate...

  4. A new cooperative MIMO scheme based on SM for energy-efficiency improvement in wireless sensor network.

    Science.gov (United States)

    Peng, Yuyang; Choi, Jaeho

    2014-01-01

    Improving the energy efficiency in wireless sensor networks (WSN) has attracted considerable attention nowadays. The multiple-input multiple-output (MIMO) technique has been proved as a good candidate for improving the energy efficiency, but it may not be feasible in WSN which is due to the size limitation of the sensor node. As a solution, the cooperative multiple-input multiple-output (CMIMO) technique overcomes this constraint and shows a dramatically good performance. In this paper, a new CMIMO scheme based on the spatial modulation (SM) technique named CMIMO-SM is proposed for energy-efficiency improvement. We first establish the system model of CMIMO-SM. Based on this model, the transmission approach is introduced graphically. In order to evaluate the performance of the proposed scheme, a detailed analysis in terms of energy consumption per bit of the proposed scheme compared with the conventional CMIMO is presented. Later, under the guide of this new scheme we extend our proposed CMIMO-SM to a multihop clustered WSN for further achieving energy efficiency by finding an optimal hop-length. Equidistant hop as the traditional scheme will be compared in this paper. Results from the simulations and numerical experiments indicate that by the use of the proposed scheme, significant savings in terms of total energy consumption can be achieved. Combining the proposed scheme with monitoring sensor node will provide a good performance in arbitrary deployed WSN such as forest fire detection system.

  5. Drag reduction of a car model by linear genetic programming control

    Science.gov (United States)

    Li, Ruiying; Noack, Bernd R.; Cordier, Laurent; Borée, Jacques; Harambat, Fabien

    2017-08-01

    We investigate open- and closed-loop active control for aerodynamic drag reduction of a car model. Turbulent flow around a blunt-edged Ahmed body is examined at ReH≈ 3× 105 based on body height. The actuation is performed with pulsed jets at all trailing edges (multiple inputs) combined with a Coanda deflection surface. The flow is monitored with 16 pressure sensors distributed at the rear side (multiple outputs). We apply a recently developed model-free control strategy building on genetic programming in Dracopoulos and Kent (Neural Comput Appl 6:214-228, 1997) and Gautier et al. (J Fluid Mech 770:424-441, 2015). The optimized control laws comprise periodic forcing, multi-frequency forcing and sensor-based feedback including also time-history information feedback and combinations thereof. Key enabler is linear genetic programming (LGP) as powerful regression technique for optimizing the multiple-input multiple-output control laws. The proposed LGP control can select the best open- or closed-loop control in an unsupervised manner. Approximately 33% base pressure recovery associated with 22% drag reduction is achieved in all considered classes of control laws. Intriguingly, the feedback actuation emulates periodic high-frequency forcing. In addition, the control identified automatically the only sensor which listens to high-frequency flow components with good signal to noise ratio. Our control strategy is, in principle, applicable to all multiple actuators and sensors experiments.

  6. Evolution of bow-tie architectures in biology.

    Directory of Open Access Journals (Sweden)

    Tamar Friedlander

    2015-03-01

    Full Text Available Bow-tie or hourglass structure is a common architectural feature found in many biological systems. A bow-tie in a multi-layered structure occurs when intermediate layers have much fewer components than the input and output layers. Examples include metabolism where a handful of building blocks mediate between multiple input nutrients and multiple output biomass components, and signaling networks where information from numerous receptor types passes through a small set of signaling pathways to regulate multiple output genes. Little is known, however, about how bow-tie architectures evolve. Here, we address the evolution of bow-tie architectures using simulations of multi-layered systems evolving to fulfill a given input-output goal. We find that bow-ties spontaneously evolve when the information in the evolutionary goal can be compressed. Mathematically speaking, bow-ties evolve when the rank of the input-output matrix describing the evolutionary goal is deficient. The maximal compression possible (the rank of the goal determines the size of the narrowest part of the network-that is the bow-tie. A further requirement is that a process is active to reduce the number of links in the network, such as product-rule mutations, otherwise a non-bow-tie solution is found in the evolutionary simulations. This offers a mechanism to understand a common architectural principle of biological systems, and a way to quantitate the effective rank of the goals under which they evolved.

  7. On the MIMO Capacity for Distributed System under Composite Rayleigh/Rician Fading and Shadowing

    Directory of Open Access Journals (Sweden)

    Santiago González-Aurioles

    2015-01-01

    Full Text Available Wireless channels are commonly affected by short-term fading and long-term fading (shadowing. The shadowing effects must be taken into account also when mobility is present in the wireless scenario. Using a composite fading model, the total channel capacity can be studied for a scenario with short-term Rayleigh fading along with shadowing. This work provides quantitative results for these kinds of scenarios with Rayleigh fading and shadowing, considering also multiple-input and multiple-output systems, which have not been previously reported. In addition, the channel capacity has been studied in depth in its relation with the shadowing level, signal to noise ratio, and the number of elements in the multiple-input and multiple-output system. Moreover, the channel performance with shadowing has been compared to the one without it. Furthermore, Rician model with shadowing is studied and its results are reported. In addition, correlated and experimental results are provided. It is identified that the distributed MIMO systems can benefit from shadowing in Rician channels. This advantage has not been reported previously. This type of fading is proposed for massive MIMO by others and our results open the door to emulate massive MIMO on a reverberation chamber.

  8. Estimation of MIMO channel capacity from phase-noise impaired measurements

    DEFF Research Database (Denmark)

    Pedersen, Troels; Yin, Xuefeng; Fleury, Bernard Henri

    2008-01-01

    Due to the significantly reduced cost and effort for system calibration time-division multiplexing (TDM) is a commonly used technique to switch between the transmit and receive antennas in multiple-input multiple-output (MIMO) radio channel sounding. Nonetheless, Baum et al. [1], [2] have shown t...... matrix. It is shown by means of Monte Carlo simulations assuming a measurementbased phase noise model, that the MIMO channel capacity can be estimated accurately for signal to noise ratios up to about 35 dB......Due to the significantly reduced cost and effort for system calibration time-division multiplexing (TDM) is a commonly used technique to switch between the transmit and receive antennas in multiple-input multiple-output (MIMO) radio channel sounding. Nonetheless, Baum et al. [1], [2] have shown...... that phase noise of the transmitter and receiver local oscillators, when it is assumed to be a white Gaussian random process, can cause large errors of the estimated channel capacity of a low-rank MIMO channel when the standard channel matrix estimator is used. Experimental evidence shows that consecutive...

  9. Análise multivariada para estratificação volumétrica de uma floresta ombrófila densa de terra firme, Amazônia Oriental

    Directory of Open Access Journals (Sweden)

    Souza Agostinho Lopes de

    2006-01-01

    Full Text Available O objetivo deste estudo foi propor um método de estratificação em classes homogêneas de estoque volumétrico da floresta ombrófila densa de terra firme não explorada, empregando-se as técnicas de análises de agrupamento e discriminante. A pesquisa foi conduzida na Unidade de Manejo Florestal (UMF da Fazenda Tracajás (02º35'53"S e 47º47'10"W, pertencente à empresa Nova Era Agroflorestal, de propriedade do Grupo Rosa Madeireira, Município de Paragominas, Estado do Pará. Foi realizado um censo (100%, no qual se estimaram os volumes do fuste comercial das árvores com dap > 45 cm de 55 espécies comerciais em 49 talhões de exploração com 10 ha cada um. Reuniram-se os volumes estimados do fuste comercial das árvores individuais por talhão em ordem crescente. Elaborou-se uma matriz X de dados desses volumes, em que cada variável x ij representou o i-ésimo volume classificado no j-ésimo talhão. A matriz X foi utilizada como input nas análises de agrupamento e discriminante. A aplicação da análise de agrupamento, método de Ward, resultou em agrupamentos hierárquicos dos talhões em classes de estoques. A análise do dendrograma permitiu estratificar o povoamento em três grupos homogêneos e distintos, denominados classes I, II e III de estoques volumétricos. A análise discriminante, método de Fisher, indicou que 100% dos talhões foram corretamente classificados. A classificação multivariada da floresta em classes de estoques volumétricos mostrou-se um método eficiente na estratificação de áreas homogêneas de florestas ineqüiâneas, as quais podem se constituir em estratos, compartimentos, classes de sítio e unidades de produção anual.

  10. Efficacy of modified atmosphere packaging to control Sitophilus spp. in organic maize grain

    Directory of Open Access Journals (Sweden)

    Marcelo De Carli

    2010-12-01

    Full Text Available The effect of modified atmosphere packaging on the mortality of Sitophilus spp. in organic maize grain was studied. Maize grains were packed with five different atmospheres consisting of 20% O2, or 20, 40, 60, 80% CO2 with remaining N2. The packages were stored for 30 days at 26°C. CO2 and O2 concentrations were monitored inside the packages during the storage. The moisture content, titratable acidity and pH were analysed on the first and thirtieth day. At 5, 15 and 30 days of storage no significant differences were observed in the percentages of dead insects when CO2 was used. The results of progeny indicated that from the fifth day the number of emerging insects was low at 20, 60 and 80% CO2. Complete inhibition of the insects was achieved with 30 days of exposure in CO2 atmospheres.O efeito da embalagem em atmosferas modificadas sobre os insetos Sitophilus spp. nos grãos de milho orgânico foi estudado. Os grãos de milho foram empacotados em cinco atmosferas iniciais diferentes de 20% de O2, ou 20, 40, 60, 80% de CO2 com balanço de N2. As embalagens foram armazenadas por 30 dias a 26ºC. As concentrações de CO2 e O2 foram monitoradas dentro das embalagens durante o armazenamento. As análises de teor de umidade, acidez e pH foram também realizados no primeiro e trigésimo dia. Os resultados mostraram que no quinto, décimo quinto e trigésimo dia de estocagem não foram encontrados diferenças significativas nas porcentagens de insetos mortos quando CO2 foi usado. Os resultados relativos à progênie indicaram que no quinto dia o número de insetos emergentes foi menor a 20, 60 e 80% CO2. A completa inibição dos insetos foi atingida com 30 dias de exposição em atmosferas de CO2.

  11. Evolução do desempenho cognitivo dos jovens brasileiros no Pisa Evolution of the cognitive achievement of Brazilian youth on Pisa

    Directory of Open Access Journals (Sweden)

    Sergei Suarez Dillon Soares

    2012-04-01

    Full Text Available O artigo analisa a evolução das habilidades cognitivas dos jovens brasileiros medidas pelo Programa Internacional de Avaliação de Alunos - Pisa. Reporta-se a resultados bem positivos. Apesar de um aumento considerável na porcentagem dos jovens aptos a fazer o Pisa e, portanto, uma forte redução na seletividade, a nota média brasileira subiu 33 pontos ao longo dos últimos nove anos. A posição relativa do país também aumentou: nossa nota média foi de 75% para 80% da nota média do grupo original de países que fizeram o Pisa em 2000. Em termos distributivos, a melhora foi mais proeminente na parte inferior da distribuição de habilidades cognitivas. Os centésimos na cauda inferior da distribuição de matemática viram suas notas aumentarem em torno de 70 pontos contra em torno de 30 pontos para os centésimos na cauda superior.This article analyzes the evolution of young Brazilians' cognitive abilities, as measured by the Program for International Student Assessment - Pisa. The results were very positive. Although it was observed a considerable increase in the percentage of youngsters able to complete the Pisa exam and, therefore, a strong decrease in selectivity, the Brazilian average rose 33 points over the past nine years. The relative position of the Brazil also increased, since the average score rose from 75% to 80% of the one found in the original group of countries that participated in this survey, in 2000. In distributive terms, the improvement was even more prominent in the bottom of the cognitive abilities' distribution: the hundredths in the lower tail distribution in Mathematics had their scores increased by about 70 points, against approximately 30 points found in the hundredths of the upper tail.

  12. Presentación de un modelo antropométrico para la evaluación del paciente sometido a distracción osteogénica mandibular An anthropometric model presentation to assess the patient underwent to mandibular osteogenic distraction

    Directory of Open Access Journals (Sweden)

    Dadonim Vila Morales

    2009-09-01

    Full Text Available Propósito del estudio: proponer un modelo antropométrico que permita evaluar de forma homogénea la evolución de los pacientes sometidos a distracción osteogénica mandibular. Métodos: se realizó un estudio previo en el que se constató la ausencia de un protocolo internacional que estandarice el estudio y evaluación de los resultados obtenidos con distracción osteogénica mandibular y que permita evaluar la recidiva esqueletal a largo plazo. Se tomó como elementos de medidas los estudios cefalométricos angulares y lineales de McNamara y Steiner y se incluyó el panorograma de Simoes. Se diseñó un modelo matemático con fórmulas que permiten evaluar la distracción obtenida en rama y cuerpo, así como la efectividad del tratamiento y la estabilidad a largo plazo. Se propuso además una valoración de los cambios oclusales obtenidos. Resultados: el modelo antropométrico propuesto constituye un instrumento útil para implementar el método científico en el estudio y evaluación de los pacientes tratados con distracción osteogénica mandibular. Conclusiones: el modelo antropométrico propuesto es un método idóneo para evaluar, de forma homogénea, la evolución de los pacientes sometidos a distracción osteogénica mandibular.Aim: To propose a anthropometric model allows in a homogenous way to assess the course of patients underwent to mandibular osteogenic distraction. Methods: A prior study was carried out which allow us to confirm the lack of a international protocol generalizing the study and the evaluation of results achieved with the mandibular osteogenic distraction and also allows to assess the long-term skeletal relapse. Measurements elements include the McNamara and Steiner's angular and linear cephalometry studies as well as the Simoes panography. A mathematical model was designed with formulae allowing assessing the distraction achieved in branch and body as well as the effectiveness of treatment and long

  13. A novel single-step, multipoint calibration method for instrumented Lab-on-Chip systems

    DEFF Research Database (Denmark)

    Pfreundt, Andrea; Patou, François; Zulfiqar, Azeem

    2014-01-01

    for instrument-based PoC blood biomarker analysis systems. Motivated by the complexity of associating high-accuracy biosensing using silicon nanowire field effect transistors with ease of use for the PoC system user, we propose a novel one-step, multipoint calibration method for LoC-based systems. Our approach...... specifically addresses the important interfaces between a novel microfluidic unit to integrate the sensor array and a mobile-device hardware accessory. A multi-point calibration curve is obtained by generating a defined set of reference concentrations from a single input. By consecutively splitting the flow...

  14. Design of output feedback controller for a unified chaotic system

    International Nuclear Information System (INIS)

    Li Wenlin; Chen Xiuqin; Shen Zhiping

    2008-01-01

    In this paper, the synchronization of a unified chaotic system is investigated by the use of output feedback controllers; a two-input single-output feedback controller and single-input single-output feedback controller are presented to synchronize the unified chaotic system when the states are not all measurable. Compared with the existing results, the controllers designed in this paper have some advantages such as small feedback gain, simple structure and less conservation. Finally, numerical simulations results are provided to demonstrate the validity and effectiveness of the proposed method

  15. Taming Chaos by Linear Regulation with Bound Estimation

    Directory of Open Access Journals (Sweden)

    Jiqiang Wang

    2015-01-01

    Full Text Available Chaos control has become an important area of research and consequently many approaches have been proposed to control chaos. This paper proposes a linear regulation method. Different from the existing approaches is that it can provide region of attraction while estimating the bounding behaviour of the norm of the states. The proposed method also possesses design flexibility and can be easily used to cater for special requirement such that control signal should be generated via single input, single state, static feedback and so forth. The applications to the Tigan system, the Genesio chaotic system, the novel chaotic system, and the Lorenz chaotic system justify the above claims.

  16. Periodic orbits from Δ-modulation of stable linear systems

    OpenAIRE

    Xia, X.; Zinober, A.

    2004-01-01

    The �-modulated control of a single input, discrete time, linear stable system is investigated. The modulation direction is given by cTx where c �Rn/{0} is a given, otherwise arbitrary, vector. We obtain necessary and sufficient conditions for the existence of periodic points of a finite order. Some concrete results about the existence of a certain order of periodic points are also derived. We also study the relationship between certain polyhedra and the periodicity of the �-modulated orb...

  17. Neuro-PID tracking control of a discharge air temperature system

    International Nuclear Information System (INIS)

    Zaheer-uddin, M.; Tudoroiu, N.

    2004-01-01

    In this paper, the problem of improving the performance of a discharge air temperature (DAT) system using a PID controller and augmenting it with neural network based tuning and tracking functions is explored. The DAT system is modeled as a SISO (single input single output) system. The architecture of the real time neuro-PID controller and simulation results obtained under realistic operating conditions are presented. The neural network assisted PID tuning method is simple to implement. Results show that the network assisted PID controller is able to track both constant and variable set point trajectories efficiently in the presence of disturbances acting on the DAT system

  18. A New Energy Efficiency Measure for Quasi-Static MIMO Channels

    OpenAIRE

    Belmega , Elena Veronica; Lasaulce , Samson; Debbah , Merouane; Hjorungnes , Are

    2009-01-01

    International audience; In this paper, we consider the multiple input multiple out- put (MIMO) quasi static channel. Our objective is to study the power allocation (over the transmit antennas) problem where not only the performance with respect to (w.r.t.) the transmission reliability but also the cost in terms of the consumed power is accounted for. We first review the existing results w.r.t energy effciency functions (benefit per cost) which focus mainly on the single input single output (S...

  19. Novel LY Converter Topologies for High Gain Transfer Ratio - A New Breed of XY Family

    DEFF Research Database (Denmark)

    Bhaskar, M.S.; Padmanaban, S.; Kulkarni, R.

    2016-01-01

    gain and minimum internal resistance; such as a photovoltaic MLI system, high voltage applications and electrical drives. The conspicuous features of proposed LY converter topologies are i) Single power control switch ii) Single Input source iii) Inverting output voltage iv) Transformer-less converter...... topologies v) High inverting voltage gain with moderate duty ratio vi) Less number of power devices and components. The proposed topologies have minimum internal resistance and its effect on voltage gain of LY converter is also discussed in detail. The simulation results are presented and the result...

  20. Neuro-models for discharge air temperature system

    International Nuclear Information System (INIS)

    Zaheer-uddin, M.; Tudoroiu, N.

    2004-01-01

    Nonlinear neuro-models for a discharge air temperature (DAT) system are developed. Experimental data gathered in a heating ventilating and air conditioning (HVAC) test facility is used to develop multi-input multi-output (MIMO) and single-input single-output (SISO) neuro-models. Several different network architectures were explored to build the models. Results show that a three layer second order neural network structure is necessary to achieve good accuracy of the predictions. Results from the developed models are compared, and some observations on sensitivity and standard deviation errors are presented