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Abstract: Low-complexity blind turbo receivers composed of a soft-feedback equaliser (SFE) and fast least-squares (FLS) channel estimators are proposed. To reduce the complexity of the SFE computation, a function approximation is proposed instead of numerical algorithms in a specific step of the equaliser's computation. Concerning FLS channel estimators, a specific filter parameters initialisation procedure is proposed in each turbo iteration to avoid possible numerical instabilities. Estimation of noise variance is also considered. The proposed scheme can perform as the turbo equaliser with perfect channel knowledge from a certain signal-to-noise ratio. Keywords: fast least-squares channel estimation, function approximation, low-complexity blind turbo receivers, noise variance estimation, numerical algorithms, signal-to-noise ratio, soft-feedback equalisation, turbo iteration Construction of new families of nonbinary CSS codes Giuliano Gadioli La Guardia, Reginaldo Palazzo Junior Discrete Mathematics ISSN: 0012-365X v:310 n:21 Nov-2010 pp:2935-2945 doi: 10.1016/j.disc.2010.06.043 Abstract: New families of good q-ary (q is an odd prime power) Calderbank–Shor–Steane (CSS) quantum codes derived from two distinct classical Bose–Chaudhuri–Hocquenghem (BCH) codes, not necessarily self-orthogonal, are constructed. These families consist of CSS codes whose parameters are better than the ones available in the literature and comparable to the parameters of quantum BCH codes generated by applying the q-ary Steane’s enlargement of CSS codes. Keywords: Cyclotomic cosets, Bose–Chaudhuri– Hocquenghem (BCH) codes, Calderbank–Shor–Steane (CSS) codes Diffraction-Attenuation Resistant Beams: their Higher Order VErsions and Finite-Aperture Generations Michel Zamboni Rached, Leonardo André Ambrósio, Hugo Enrique Hernandez Figueroa Applied Optics ISSN: 1540-8973 v:49 n:30 Oct-2010 pp:5861-5869 doi: 10.1364/AO.49.005861 Abstract: Recently, a method for obtaining diffraction– attenuation resistant beams in absorbing media has been developed in terms of suitable superposition of ideal zero-order Bessel beams. In this work, we show that such beams keep their resistance to diffraction and absorption even when generated by finite apertures. Moreover, we shall extend the original method to allow a higher control over the transverse intensity profile of the beams. Although the method is developed for scalar fields, it can be applied to paraxial vector wave fields, as well. These new beams have many potential applications, such as in freespace optics, medical apparatus, remote sensing, and optical tweezers. Keywords: Laser beam shaping, Diffraction theory, Waves Efficient Calculation of Higher-Order Optical Waveguide Dispersion José Amilton Mores Junior, Gilliard Nardel Malheiros Silveira, Hugo Luis Fragnito, Hugo Enrique Hernandez Figueroa Optics Express ISSN: 1094-4087 v:18 n:19 Sep-2010 pp:19522-19531 doi: 10.1364/OE.18.019522 Abstract: An efficient numerical strategy to compute the higher-order dispersion parameters of optical waveguides is presented. For the first time to our knowledge, a systematic study of the errors involved in the higher-order dispersions’ numerical calculation process is made, showing that the present strategy can accurately model those parameters. Such strategy combines a full-vectorial finite element modal solver and a proper finite difference differentiation algorithm. Its performance has been carefully assessed through the analysis of several key geometries. In addition, the optimization of those higher-order dispersion parameters can also be carried out by coupling to the present scheme a genetic algorithm, as shown here through the design of a photonic crystal fiber suitable for parametric amplification applications. Keywords: Numerical approximation and analysis, Parametric oscillators and amplifiers, Waveguides, Dispersion, Photonic crystal fibers Gradient Forces on Double-Negative Particles in Optical Tweezers using Bessel Beams in the Ray Optics Regime Hugo Enrique Hernandez Figueroa, Leonardo André Ambrósio Optics Express ISSN: 1094-4087 v:18 n:23 Nov-2010 pp:24287-24292 doi: 10.1364/OE.18.024287 Abstract: Gradient forces on double negative (DNG) spherical dielectric particles are theoretically evaluated for v-th Bessel beams supposing geometrical optics approximations based on momentum transfer. For the first time in the literature, comparisons between these forces for double positive (DPS) and DNG particles are reported. We conclude that, contrary to the conventional case of positive refractive index, the gradient forces acting on a DNG particle may not reverse sign when the relative refractive index n goes from |n| > 1 to |n| < 1, thus revealing new and interesting trapping properties. Keywords: Geometric optics, Left-handed materials, Metamaterials, Optical tweezers or optical manipulation Luminescence of PbS quantum dots spread on the core surface of a silica microstructured optical fiber E. F. Chilcce, Roddy Elky Ramos Gonzales, C. M. B. Cordeiro, Luis Enrique Gutierrez Rivera, Hugo Luis Fragnito, Carlos Henrique de Brito Cruz, Aldario Chrestani Bordonalli, Hugo Enrique Hernandez Figueroa, R.L. Braga, Luiz Carlos Barbosa Journal of Non-Crystalline Solids ISSN: 0022-3093 v:356 n:44 Oct-2010 pages:2397–2401 doi: 10.1016/j.jnoncrysol.2010.03.025 Abstract: The broadband luminescence spectra, in the region from around 1000 to 1650 nm, of lead sulphide (PbS) quantum dots (QDs) spread onto the dual core surfaces of silica microstructured optical fibers (MOFs) (core diameters of not, vert, similar 2.5 and not, vert, similar 5.0 µm) are reported. For this purpose, colloidal solutions of PbS QDs of different sizes with luminescence bands around 877 (PbS877), 1160 (PbS1160), and 1474 nm (PbS1474) were injected and then spread onto the dual core surfaces of silica MOFs using a nitrogen gas pressure system. The PbS QDs were excited (via evanescent field effect) by the light of a continuum wave semiconductor laser or a Ti:sapphire laser (at 785 nm) guided through the MOF cores. As an important result, blue-shift and the band broadening behaviors in the luminescence spectra of these PbS QDs were observed. Keywords: Microstructured optical fiber, Luminescence, Lead sulphide, Quantum dots, Evanescent field effect Modeling Interference in Wireless Ad Hoc Networks Paulo Cardieri IEEE Communications Surveys and Tutorials ISSN: 1553-877X v:12 n:4 Nov-2010 pp:551 - 572 doi: 10.1109/SURV.2010.032700096 Abstract: The recent increasing interest in ad hoc networks has motivated the study and development of interference models capable of capturing the intrinsic characteristics of this kind of network, such as the lack of a central coordination and the consequent distributed nature of some of the network 58 Sinopse da FEEC
functions (e.g., medium access control and routing protocols). As a consequence, a myriad of interference models for ad hoc networks can be found in the literature, that describes the effects of interference at different layers and with different levels of detail. Some of these models describe interference as a random process whose statistics depend mainly on physical layer parameters, and are better suited for the analysis of issues related to the physical layer. Other models focus on the effects of interference at higher layers, and are more appropriate when the analysis of network-related issues is of interest. This paper presents a comprehensive survey of interference models for wireless ad hoc networks, emphasizing their domains of application, illustrated with examples. The interference models are presented in this survey from the perspective of the radio capture phenomenon, resulting in a unified view of interference models, which may be helpful when selecting the appropriate model for a given purpose. Keywords: α-stable distribution-stable distribution, interference graphs, interference models, spatial point process, wireless ad hoc networks, wireless network models New Classes Of Topological Quantum Codes Associated With Self-Dual, Quasi Self-Dual And Denser Tessellations C. D. Albuquerque, Reginaldo Palazzo Jr., E. B. Silva Quantum Information & Computation ISSN: 1533-7146 v:10 n:11 Nov-2010 pp:956-970 Abstract: In this paper we present six classes of topological quantum codes (TQC) on compact surfaces with genus g ≥ 2. These codes are derived from self-dual, quasi self-dual and denser tessellations associated with embeddings of self-dual complete graphs and complete bipartite graphs on the corresponding compact surfaces. The majority of the new classes has the self-dual tessellations as their algebraic and geometric supporting math- ematical structures. Every code achieves minimum distance 3 and its encoding rate is such that k/n → 1 as n → ∞, except for the one case where k/n → 1/3 as n → ∞. Keywords: Topological quantum codes, Quantum errorcorrecting codes, Surface codes, Tessellations. Power Correlation Coefficient of a Very General Fading Model in Maximal Ratio Combining José Ricardo Mendes, Michel Daoud Yacoub, Ugo Silva Dias IEEE Transactions on Communications ISSN: 0090-6778 v:58 n:9 Sep-2010 pp:2472-2479 doi: 10.1109/TCOMM.2010.09.090257 Abstract: A very general fading scenario is considered for which exact, closed-form formulas for the correlation coefficient of the instantaneous power at the output of a Maximal Ratio Combining receiver is derived. The model includes the main fading environments as very particular cases. It is valid for both identically and non-identically distributed multipath clusters, and for both stationary and nonstationary environments. Most interestingly, the model allows for an uncountable number of combinations of novel fading scenarios. A further generalization is achieved with the angle as well as the time of arrival of the waves permitted to vary throughout the multipath clusters, as opposed to known models for which these parameters are fixed. Several particular examples illustrate the applicability of the general formulations. Keywords: η-μ distribution, κ-μ distribution, Correlation coefficient, Hoyt distribution, Nakagami-m distribution, Rayleigh distribution, Rice distribution, fading model, maximal ratio combining Richards growth model and viability indicators for populations subject to interventions Selene Loibel, Marinho G. Andrade, João Bosco Ribeiro do Val, Alfredo R. de Freitas Anais da Academia Brasileira de Ciências (Annals of the Brazilian Academy of Sciences) ISSN: 0001-3765 v:82 n:4 Dec-2010 pp:1107-1126 doi: 10.1590/S0001-37652010000400028 Abstract: In this work we study the problem of modeling identification of a population employing a discrete dynamic model based on the Richards growth model. The population is subjected to interventions due to consumption, such as hunting or farming animals. The model identification allows us to estimate the probability or the average time for a population number to reach a certain level. The parameter inference for these models are obtained with the use of the likelihood profile technique as developed in this paper. The identification method here developed can be applied to evaluate the productivity of animal husbandry or to evaluate the risk of extinction of autochthon populations. It is applied to data of the Brazilian beef cattle herd population, and the the population number to reach a certain goal level is investigated. Keywords: Richards growth model, population risk, harvested populations, parametric estimate, likelihood profile function. Article in proceedings Automation A Consciousness-Based Control System for a Simulated Autonomous Vehicle Ricardo Capitanio Martins Da Silva, Ricardo Ribeiro Gudwin In: XVIII Congresso Brasileiro de Automática (CBA 2010)- Antonio Padilha Feltrin(Ed.) - ISBN: 978-85-61507-02-2 SBA - Sociedade Brasileira de Automática – Bonito(MS) - Brasil Sep-2010 pp:1648-1655 Abstract: This work describes the application of the Baars- Franklin Architecture (BFA), an artificial consciousness approach, to synthesize a control system for an autonomous vehicle. The BFA was reported in the literature as a successful control system to different kinds of agents: CMattie, IDA and CTS. In this paper, BFA is for the first time applied for controlling an autonomous vehicle. Firstly we introduce the theoretical foundations of this approach for the development of a conscious agent. Then we explain the architecture of our agent and at the end we discuss the results and first impressions of this approach. Keywords: artificial consciousness, intelligent systems, autonomous vehicle, multi-agent systems Análise de Estabilidade e Controle H∞ de Sistemas Lineares com Atraso Rubens H. Korogui, André R. Fioravanti, José C. Geromel In: XVIII Congresso Brasileiro de Automática (CBA 2010)- Antonio Padilha Feltrin(Ed.) - ISBN: 978-85-61507-02-2 SBA - Sociedade Brasileira de Automática – Bonito(MS) - Brasil Set-2010 pp:4038-4043 Abstract: This paper aims at introducing a linear time invariant comparison system for stability analysis and ∞ control design of time-delay systems. A 2n-th order rational system, called comparison system, is defined and is associated to a time-delay system with n state variables in such a way that stability analysis and H∞ control design of the comparison system are strongly related to those of the time-delay system. In this paper, the state feedback control design is used to show the potentialities of the proposed methodology. Keywords: Time-delay systems, H∞ control design, linear systems, numerical methods Avaliação de modelos de ativos financeiros com vistas a otimização de carteiras multi-período João Bosco Ribeiro do Val, André Schonardie Pasqual In: XVIII Congresso Brasileiro de Automática (CBA 2010)- Antonio Padilha Feltrin(Ed.) - ISBN: 978-85-61507-02-2 Academic Bulletin of FEEC-Unicamp 59
Page 1 and 2: Editorial This is the thrird issue
Page 3 and 4: objects to be cut according to a cu
Page 5: classical morphological segmentatio
Page 9 and 10: Abstract: Este trabalho mostra a ev
Page 11 and 12: Filtragem de Medidas Transmitidas p
Page 13 and 14: Keywords: Static output feedback, H
Page 15 and 16: Electronic, Micro-electronic, Opto-
Page 17 and 18: Atmospheric Pressure in the Amazon
Page 19 and 20: árvore pulmonar. Obstruções tota
Page 21 and 22: Keywords: Engenharia Clínica, Proj
Page 23 and 24: Recife, PE Oct-2010 pp:1-5 Abstract
Page 25 and 26: feasibility and usefulness are vali
Page 27 and 28: Abstract: This work analyzes the co
Page 29 and 30: Métodos de Pontos Interiores Aplic
Page 31 and 32: Keywords: Localização de faltas,
Page 33 and 34: Keywords: amplificador óptico a se
Page 35 and 36: Macrobends effects in single-mode g
Page 37 and 38: intricate and impracticable, becaus
Page 39 and 40: 5 - On Building Meaning: A Biologic
Page 41 and 42: new cryptographic protocols, includ
Page 43 and 44: OPTIMAL CONTRACTS ALLOCATION FOR EL
Page 45 and 46: COMPACT FORWARDING: A PROBABILISTIC
Page 47 and 48: Acknowledgement Authors With great
Page 49 and 50: Luiz Carlos Barbosa Luiz Carlos Kre

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