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oFDM System Implementation in DSP Platform TMS320C6678

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Journal of Computer and Communications 2016年第11期4卷 26-36页

作者： rafael Masashi Fukuda Taufik Abrão Department of Electrical Engineering (DEEL) Londrina State University (UEL) Londrina Brazil

The orthogonal Frequency Division Multiplexing (oFDM) system is already used in commercial applications and is capable to deal with Intersymbolic Interference (ISI) caused by multipath channels. This system gained popularity after the application of the Fast Fourier Transform (FFT) and its inverse (IFFT) to modulate the signal in many subcarriers. This paper discusses implementation aspects of an oFDM system;such system is characterized by considering real constraints, including the memory consumption and the processing time. The oFDM modulator, channel samples and oFDM demodulator were implemented entirely in the DSP TMS320C6678 platform. As a proof-of-concept, a 256-QAM oFDM BER performance is compared with theoretical values. Moreover, the memory size is not demanding, consuming very few resources. It was observed a very high number of DSP clock cycles needed for the oFDM signal modulation, corresponding to more than 4 times the number used in demodulating the signal.

关键词： oFDM DSP Platform Implementation Bit Error Rate Signal Processing Telecommunication Systems

Disturbance and forest recovery in the Monarch Butterfly Biosphere Reserve,Mexico

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Journal of Forestry Research 2020年第5期31卷 1551-1566页

作者： Jose Lopez-Garcıa rafael M.Navarro-Cerrillo Instituto de Geografıa Universidad Nacional Autonoma de MexicoCiudad UniversitariaC.P.04510 CoyoacanDFMexico Departamento de Ingenierıa Forestal Universidad de CordobaCampus de RabanalesCarretera Nacional IV km 39614014 CordobaSpain

Analysis of the change in forest cover is important to determine stand dynamics and the processes involved in disturbance and *** of the core zone of the Monarch Butterfly Biosphere Reserve were studied using photo interpretation techniques,considering biennial changes between 1999 and 2013 and changes over the whole period of study 1999–*** matrices were elaborated to determine the processes of change involved in both recovery and *** biennial changes for the whole period amounted to 2274 ha;343 ha accounted as degraded in more than one biennial *** total changes in forest cover between 1999 and 2013 involved 4902 ha,out of which,2912 ha were affected by disturbance,and 1990 ha were *** density and 2013 vegetation cover maps,the overall accuracy was 95.6%and 90.2%,*** combining both maps,gradual processes were revealed that were not evident in separate *** methodology is useful for the management and conservation of natural protected areas.

关键词： Illegal logging Forest density change Forest recovery Conifer forests Monarch Butterfly Biosphere Reserve

Elastography-based screening for esophageal varices in patients with advanced chronic liver disease

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World Journal of Gastroenterology 2019年第3期25卷 308-329页

作者： rafael Paternostro Thomas Reiberger Theresa Bucsics Department of Medicine Ⅲ Division of Gastroenterology and Hepatology Medical University of Vienna

Elastography-based liver stiffness measurement(LSM) is a non-invasive tool for estimating liver fibrosis but also provides an estimate for the severity of portal hypertension in patients with advanced chronic liver disease(ACLD). The presence of varices and especially of varices needing treatment(VNT) indicates distinct prognostic stages in patients with compensated ACLD(cACLD). The Baveno VI guidelines suggested a simple algorithm based on LSM ography, TE) and platelet count > 150 G/L for ruling-out VNT in patients with cACLD. These(and other) TE-based LSM cut-offs have been evaluated for VNT screening in different liver disease etiologies. Novel point shear-wave elastography(pSWE) and two-dimensional shear wave elastography(2D-SWE) methodologies for LSM have also been evaluated for their ability to screen for "any" varices and for VNT. Finally, the measurement of spleen stiffness(SSM) by elastography(mainly by pSWE and 2D-SWE) may represent another valuable screening tool for varices. Here, we summarize the current literature on elastography-based prediction of "any" varices and VNT. Finally,we have summarized the published LSM and SSM cut-offs in clinically useful scale cards.

关键词： Elastography Liver stiffness Spleen stiffness Shear wave Magnetic resonance elastography Varices Portal hypertension Cirrhosis Advanced chronic liver disease

Visual analytics tool for the interpretation of hidden states in recurrent neural networks

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Visual Computing for Industry,Biomedicine,and Art 2021年第1期4卷 233-245页

作者： rafael Garcia Tanja Munz Daniel Weiskopf VISUS University of Stuttgart70569 StuttgartGermany

In this paper,we introduce a visual analytics approach aimed at helping machine learning experts analyze the hidden states of layers in recurrent neural *** technique allows the user to interactively inspect how hidden states store and process information throughout the feeding of an input sequence into the *** technique can help answer questions,such as which parts of the input data have a higher impact on the prediction and how the model correlates each hidden state configuration with a certain *** visual analytics approach comprises several components:First,our input visualization shows the input sequence and how it relates to the output(using color coding).In addition,hidden states are visualized through a nonlinear projection into a 2-D visualization space using t-distributed stochastic neighbor embedding to understand the shape of the space of the hidden *** are also employed to show the details of the evolution of the hidden state ***,a time-multi-class heatmap matrix visualizes the evolution of the expected predictions for multi-class classifiers,and a histogram indicates the distances between the hidden states within the original *** different visualizations are shown simultaneously in multiple views and support brushing-and-linking to facilitate the analysis of the classifications and debugging for misclassified input *** demonstrate the capability of our approach,we discuss two typical use cases for long short-term memory models applied to two widely used natural language processing datasets.

关键词： Visual analytics Visualization Machine learning Classification Recurrent neural networks Long shortterm memory Hidden states Interpretability Natural language processing Nonlinear projection

Approach to a patient with cardiac amyloidosis

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Journal of Geriatric Cardiology 2019年第7期16卷 567-574页

作者： Christopher Strouse Alexandros Briasoulis rafael Fonseca Yogesh Jethava Department of Internal Medicine Division of HematologyOncologyand Blood and Marrow TransplantationUniversity of IowaIowa CityIAUSA Cardiomyopathy Section Cardiology DivisionUniversity of IowaIowa CityIowaUSA Bone Marrow Transplant Program Mayo ClinicPhoenixArizonaUSA

1 Introduction Cardiac amyloid(CA)is characterized by inexorably progressive heart failure making early diagnosis and treatment *** article will review the pathophysiology,clinical presentation,diagnosis,prognostication and treatment of patients with CA.2 Pathophysiology CA is the result of extracellular deposition of a misfolded protein into cardiac tissue,forming insoluble aggregations of rigid,nonbranching 10 nm wide *** causes impaired cardiac function by disrupting cardiac architecture,direct myotoxicity and ischemic injury secondary to infiltration of intramyocardial vessels.

关键词： Cardiac amyloidosis Heart failure The elderly

Ion dynamics into different pore size distributions in supercapacitors under compression

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Journal of Energy Chemistry 2023年第5期80卷 110-119,I0004页

作者： João Pedro Aguiar dos Santos Cesar J.B.Pagan rafael Vicentini Reinaldo F.Teófilo Renato Beraldo Leonardo M.Da Silva Hudson Zanin Brazilian Renewable Energies Center for Innovation on New EnergiesSchool of Electrical and Computer EngineeringUniversity of CampinasAv.Albert Einstein 40CampinasSP13083-852Brazil School of Electrical and Computer Engineering University of CampinasSP 13083-852Brazil Multivariate Chemical Data Analysis Laboratory Department of ChemistryUniversidade Federal de Viçosa36570-900 ViçosaMGBrazil Department of Chemistry Laboratory of Fundamental and Applied ElectrochemistryFederal University of Jequitinhonha and Mucuri's ValleyRodovia MGT 367km 5835000 Alto da Jacuba39100-000DiamantinaMGBrazil

Compressing supercapacitor(SCs)electrode is essential for improving the energy storage characteristics and minimizing ions’distance travel,faradaic reactions,and overall ohmic *** comprising the ion dynamics in SC electrodes under compression are still ***,the ionic dynamics of five aqueous electrolytes in electrodes under compression were studied in this work for tracking electrochemical and structural changes under mechanical stress.A superionic state is formed when the electrode is compressed until the micropores match the dimensions with the electrolyte’s hydrated ion sizes,which increases the *** excessive compression is applied,the accessible pore regions decrease,and the capacitance ***,as the studied hydrated ions have different dimensions,the match between ion/pore sizes *** the LioH and NaClo4electrolytes,increasing the pressure from 60 to 120 and 100 PSI raised the capacitance from 13.5 to 35.2 F g^(-1)and 30.9 to 39.0 F g^(-1),***,the KoH electrolyte with the lowest and LiCl with the biggest combination of hydrated ion size have their point of maximum capacitance(39.5 and 36.7F g^(-1))achieved at 140 and 80 PSI,*** LiCl and KCl electrolytes,overcompression causes a drop in capacitance higher than 23%.

关键词： Mechanic compression Pore size distribution lon dynamics Activated carbon Supercapacitors

ARTICLE REFLECTIoNS oN EU INTERNATIoNAL TRADE LAW： AN INTRoSPECTIVE VIEW

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Frontiers of Law in China-Selected Publications from Chinese Universities 2012年第1期7卷 1-20页

作者： rafael Leal-A rcas Queen Mary University of London United Kingdom

This article presents three main arguments： First, shared competence exists between the national and supranational levels within the European Union （EU） because EU Member States do not trust the European Commission in the external relations law of the EU. Second, the EU will have greater bargaining power in international negotiations if it speaks in a single voice. Within the EU-27, we have compatible values, overlapping interests, shared goals, as well as economic, social and political ties. Therefore, there is a presumption of collective action in the EU＇s external relations. However, EU Member States disagree on many issues before they start negotiations, while trying to define a mission together as partners of the European project. Third, Member States confer specific negotiating powers on the EU only when it is in their own national interest to have a common European position on international negotiations.

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Analysis of synchronization in a supermarket refrigeration system

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Control Theory and Technology 2014年第2期12卷 154-162页

作者： rafael WISNIEWSKI John LETH Jakob G. RASMUSSEN Department of Electronic Systems Aalborg University Eredrik Bajers Vej 7C 9220 Aalborg Denmark Department of Mathematical Sciences Aalborg University Fredrik Bajers Vej 7G 9220 Aalborg Denmark

In a supermarket refrigeration, the temperature in a display cases. This leads to a synchronous operation of all display cases, case, surprisingly, influences the temperature in other display in which the expansion valves in the display cases turn on and off at exactly the same time. This behavior increases both the energy consumption and the wear of components. Besides this practical importance, from the theoretical point of view, synchronization, likewise stability, Zeno phenomenon, and chaos, is an interesting dynamical phenomenon. The study of synchronization in the supermarket refrigeration systems is the subject matter of this work. For this purpose, we model it as a hybrid system, for which synchronization corresponds to a periodic trajectory. To examine whether it is stable, we transform the hybrid system to a single dynamical system defined on a torus. Consequently, we apply a Poincare map to determine whether this periodic trajectory is asymptotically stable. To illustrate, this procedure is applied for a refrigeration system with two display-cases.

关键词： Synchronization Hybrid systems Stability Limit cycles Stochastic approximation

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体育图形设计和品牌塑造的卓越之作(上)

艺术与设计 2024年第7期 66-99页

作者：拉斐尔·埃斯克冀靖轩无不详三度

蒙古国西南部的巴彦洪戈尔省,几乎是能想象到的最偏远之地。然而,就在这样一片仿佛被时间遗忘的角落的洞穴墙壁上,镌刻着一幅新石器时代的壁画,描绘了人类最原始的活动之一——体育竞技。画面上,两名摔手紧紧相拥,为围观的观众献上表演... 详细信息

蒙古国西南部的巴彦洪戈尔省,几乎是能想象到的最偏远之地。然而,就在这样一片仿佛被时间遗忘的角落的洞穴墙壁上,镌刻着一幅新石器时代的壁画,描绘了人类最原始的活动之一——体育竞技。画面上,两名摔手紧紧相拥,为围观的观众献上表演。它吸引人的地方在于,这也许是我们所知中,涉及观众参与体育赛事的“平面设计”领域里最为古老的例证。

关键词：观众参与平面设计图形设计体育竞技体育赛事品牌塑造蒙古国新石器时代