Cleonilson Protasio - Academia.edu (original) (raw)

Papers by Cleonilson Protasio

Anais do XXII Simpósio Brasileiro de Telecomunicações

Resumo-A principal contribuição deste trabalhoé a introdução do Algoritmo de Berlekamp-Massey (BM... more Resumo-A principal contribuição deste trabalhoé a introdução do Algoritmo de Berlekamp-Massey (BMA) naárea de testes de circuitos integrados. Embora o BMA tenha sido inicialmente proposto para a localização de erros em sistemas de comunicações, de fato, esse provê uma solução geral para a síntese do mais curto registrador de deslocamento com realimentação linear (LFSR) capaz de gerar uma dada seqüência finita. Neste trabalho, mostra-se que com uma ligeira modificação no BMA, pode-se projetar um esquema de teste de circuitos integrados baseado totalmente em umúnico LFSR como gerador de testes no qualé capaz de obter cobertura de falha total e tendo tanto consumo deárea de silício como tempo de teste reduzido.

Ingenius

Debido al creciente desarrollo tecnológico de los sistemas embebidos y el internet de las cosas (... more Debido al creciente desarrollo tecnológico de los sistemas embebidos y el internet de las cosas (IoT), los dispositivos basados en microcontroladores se aplican cada vez más en diversas áreas del conocimiento. En este contexto, las plataformas y productos educativos online se consideran laboratorios virtuales remotos, ya que los estudiantes pueden acceder a los dispositivos físicos en cualquier lugar siempre que dispongan de un sistema informático conectado a internet. En este sentido, este trabajo describe el diseño y desarrollo de una plataforma con cuatro productos educativos online para la enseñanza de microcontroladores y IoT. Estos productos educativos están basados en software de código abierto, lo que permite su distribución gratuita en línea y se puede acceder a ellos desde un servidor en la nube. El enfoque de código abierto y multiplataforma (Linux, Windows® y Mac OSX) permite una mayor interacción y accesibilidad del usuario. Los productos educativos en línea hacen posib...

This work presents the development of an industrial Internet of Things device for current measure... more This work presents the development of an industrial Internet of Things device for current measurement. It is employed a current transformer that is responsible not only for harvesting energy from an electric load but also as an ordinary sensor for current measurement. After proper energy harvesting, a microcontroller unit reads the current through the circuit using its own analog to digital converter. Then, having the acquired data, it transmits by radio frequency to a receiving device, which in turn sends to the Internet. A supercapacitor is used as a reservoir, so the microcontroller can transmit even in the lack of external energy. Also, the microcontroller unit turn off itself from the harvesting circuit in order to measure the current without any error introduced by its own power consumption. A sub-gigahertz wireless sensor network is implemented using a developed sensor node and a proprietary stack is also developed and presented. The experimental procedure showed the sensor n...

DOI: 10.14684/intertech.13.2014.29-33 This paper aims to describe the current technical and acade... more DOI: 10.14684/intertech.13.2014.29-33 This paper aims to describe the current technical and academic achievements resulting from the cooperation agreements between the Institute of Technology-University of Washington Tacoma (UWT) and Brazilian universities and research institutions. UWT hosted Brazilian undergraduate and graduate students in the academic year 2012-2013. The University of Washington, the Brazilian Science Without Borders Program and the Santander Bank funded these students. The Computer Engineering and Systems program at UWT provided the academic, cultural and research resources that make these achievements possible. In particular, a Wireless Sensors Networks (WSN) research group was created to study fundamental concepts and technical implementations. After returning to Brazil, the students continued the research collaboration with UWT in different topics of WSN notably in applications as agricultural irrigation, fire detection, emergency alerts, building occupancy optimization, energy harvesting and energy consumption management. Faculty in Brazilian universities are also part of these joint efforts and new funding was recently approved to extend this successful partnership. Index Terms - International Cooperation, Wireless Sensor Networks, Engineering Education.

2012 IEEE International Instrumentation and Measurement Technology Conference Proceedings, 2012

This paper presents a new scheme of Linear-Feedback Shift-Register (LFSR) reseeding technique bas... more This paper presents a new scheme of Linear-Feedback Shift-Register (LFSR) reseeding technique based on Berlekamp-Massey Algorithm (BMA). It is proposed an LFSR-based TPG which its feedback polynomial is programmable by a BMA-synthesized LFSR that, in its turn, generates specific patterns to change the LFSR-based TPG&amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;#39;s feedback polynomial. Using the proposed method, high fault coverage is achieved with a small number

IEEE Transactions on Instrumentation and Measurement, 2010

Lately, built-in self-test (BIST) has been of great importance in the manufacture of very large s... more Lately, built-in self-test (BIST) has been of great importance in the manufacture of very large scale integration (VLSI) circuits. Most BIST schemes compress the test response into a compact signature using space and/or time compaction. A fundamental problem associated with response compaction is error masking or aliasing. In this paper, an alternative zero-aliasing test response evaluation scheme for BIST is presented. The main conceptual ingredient utilized to build the proposed scheme is the application of the Berlekamp-Massey algorithm (BMA). The BMA provides a general solution for synthesizing the shortest linear feedback shift register (LFSR) capable of generating a given finite sequence. Basically, on the BIST design stage and considering the fault-free test response sequence, the BMA is used to synthesize an LFSR capable of generating this sequence in an economical way. The BIST testing stage consists in comparing the obtained test response sequence of the circuit under test (CUT) with the fault-free test response sequence generated by the LFSR previously designed. This way, a testing of the CUT can be made. It is observed that there is no aliasing using the proposed scheme. The key to make this scheme attractive is to keep the LFSR length as small as possible. Based on it, two derived schemes, called Simple-LFSR and Multi-LFSR, are shown to try to solve this problem. Experimental results are shown for some ISCAS85 benchmarks. Index Terms-Berlekamp-Massey algorithm (BMA), built-in self-test (BIST), linear feedback shift register (LFSR), output response analyzer, zero aliasing. I. INTRODUCTION B UILT-IN self-test (BIST) is rapidly becoming an industrywide standard test technique [1]. In the BIST setup, both test pattern generation and output data evaluation are performed with on-chip hardware [2]. A test pattern generator (TPG) is used to apply a test sequence T = (T 1 , T 2 ,. .. , T n), represented by the polynomial T (x), into the circuit under test (CUT), as shown in Fig. 1, where n is the test length.

Micromachines, 2021

As solar radiation is the most plentiful energy source on earth, thermoelectric energy harvesting... more As solar radiation is the most plentiful energy source on earth, thermoelectric energy harvesting emerges as an interesting solution for the Internet of Things (IoTs) in outdoor applications, particularly using semiconductor thermoelectric generators (TEGs) to power IoT devices. However, when a TEG is under solar radiation, the temperature gradient through TEG is minor, meaning that the TEG is useless. A method to keep a significant temperature gradient on a TEG is by using a solar absorber on one side for heating and a heat sink on the other side. In this paper, a compact TEG-based energy harvester that features a solar absorber based on a new class of solid matter, the so-called quasicrystal (QC), is presented. In addition, a water-cooled heat sink to improve the temperature gradient on the TEG is also proposed. The harvester is connected to a power management circuit that can provide an output voltage of 3 V and store up to 1.38 J in a supercapacitor per day. An experimental eval...

All in-text references underlined in blue are linked to publications on ResearchGate, letting you... more All in-text references underlined in blue are linked to publications on ResearchGate, letting you access and read them immediately.

The Challenge of Developing Creative Artists in a Standardized World, 2014

WSEAS TRANSACTIONS on COMMUNICATIONS archive, 2017

Testing of integrated circuits (ICs) is always a challenge because the continuous miniaturization... more Testing of integrated circuits (ICs) is always a challenge because the continuous miniaturization process and consequently increase of transistor density in microelectronic industry. Nowadays, the industry has to handle with defects that traditional testing approaches can not detect. The result of this imprecise testing process is the increase number of defective ICs that reach the end consumer. To improve the quality of IC testing, a new approach of fault modeling is being adopted which is not based on transistor or logic gate level, but in the IC layout perspective itself. This paper describes the meaning of testing based on layout perspective, particularly, Cell-Aware Testing (CAT) methodology, and a practical approach to obtain the matrix of defects, in which is the set of test patterns to each modelled fault coming from CAT, and that is the CAT’s main result. Experimental simulation results show the matrix of defects obtained for a specific standard cell that can be immediately...

2019 IEEE 10th Annual Information Technology, Electronics and Mobile Communication Conference (IEMCON), 2019

The Internet of Things (IoT) has become widely used in recent years in a wide range of applicatio... more The Internet of Things (IoT) has become widely used in recent years in a wide range of applications, such as, weather condition monitoring, transportation, smart homes, smart cities, smart farm, etc. The ecosystem of the IoT is also vast, including from sensor and hardware devices up to cloud-computing. An approach that is getting more and more attention in the IoT ecosystem is the edge-computing and one of its fundamental pieces of equipment is the edge-computing gateway (GTW), which can working as a data-processing device nearer to the things and as a bridge to the Internet, as well. The most important features for these GTWs must be robustness and efficiency and a very popular solution is to use low-cost Raspberry Pi card-size computers. Considering protocol solution, Message Queue Telemetry Transport (MQTT) communication protocol has been considered one of the most applicable to IoT because of its low-power capability. In this context, this paper describes a study about the perf...

An embedded module testing scheme using embedded processor into System-on-Chip (SoC), Systemin- P... more An embedded module testing scheme using embedded processor into System-on-Chip (SoC), Systemin- Package (SiP) or System-on-Board (SoB) is presented. Such a processor executes a test program based on immune system for testing the module under test. To design the proposed scheme, it is applied the Negative-Selection Mechanism of the immune system, which is able to discriminate between the self (body’s own cell) and any foreign cell (non-self). Experimental results show the effectively of this scheme.

2016 IEEE International Instrumentation and Measurement Technology Conference Proceedings, 2016

Thermoelectric Modules (TEM) are used in areas such as precision temperature control applications... more Thermoelectric Modules (TEM) are used in areas such as precision temperature control applications, cooling system, energy harvesting, etc. The fully characterization of TEM is very important, mainly with respect to its degradation. In order to evaluate degradation, thermal cycling application is one of the most used methods. In this work it is described a complete thermal-cycling testing platform of TEM that is capable of measuring parameters such as Seebeck coefficient (α), thermal conductivity (λ), Figure of Merit (ZT) and others in an automatic way. Experimental results show the effectivity of the proposed testing platform.

Air pollution is directly related to both the cause and aggravation of various diseases and the c... more Air pollution is directly related to both the cause and aggravation of various diseases and the cause of ecological damage to the environment. According to the World Health Organization (WHO), 4.2 million deaths are attributed to air pollution each year and 91 % of the World's population lives in places that exceed the indicated air quality limits. In this work, an intelligent and compact wireless sensor for air pollution monitoring is presented having as main target to alert the population and to allow certain control of pollutants emissions by governing authorities. The proposed wireless intelligent sensor monitors Particulate Matter (PM) using the cheap and compact PPD42NS sensor, which uses light scattering to measure particles concentration. To consider the PPD42NS sensor as the PM sensor to the proposed wireless sensor, a calibration process was conducted using as the reference equipment the HiVol HVS 3000, fabricated by the Ecotech and approved by the EPA as a Federal Ref...

AC current sensors are key components in the monitoring systems of electric power systems and are... more AC current sensors are key components in the monitoring systems of electric power systems and are generally based on detecting the magnetic field induced around electric wires to measure the current into it. The most used current sensors are those based on Current Transformer (CT) that, in general, uses a ferromagnetic core and a coil around it in order to measure the primary-coil current by the secondary-coil induced voltage. To the best of our knowledge, all current sensors based on CT work on the undersaturation region of the ferromagnetic core material to take advantage of its quasi-linear feature, but limits its maximum operational current. In this paper, it is described a novel CT-based current sensor scheme that works on saturation region of a nanocrystalline core.

2020 IEEE International Instrumentation and Measurement Technology Conference (I2MTC)

Energy harvesting is an important research area of the Internet of Things (IoT), mainly in the so... more Energy harvesting is an important research area of the Internet of Things (IoT), mainly in the so-called Internet of Natural Things (IoNT), which is an IoT technique applied to things found in the nature like trees, rocks, and animals that need to be powered by environmentally available energy. Among several energy harvesting solutions, the thermoelectric-based energy harvester is a very promising one and it is generally based on semiconductor-based thermoelectric generators (TEGs) where the output electric voltage is proportional to the applied temperature gradient on them. However, the most important natural energy source is the solar radiation that, when incident in a surface, warms it and, as a result, the surface achieves a homogeneous temperature, turning the TEG useless since temperature gradient is zero. A possible solution for thermoelectric energy harvesting directly from solar radiation is to provide a way to selectively absorb solar radiation using different surfaces with adequate properties to obtain a temperature gradient. In this paper, a solar-radiation-powered thermoelectric energy harvester is proposed. The proposed harvester is based on the use of a new kind of material, called quasicrystals, to build selective solar absorbers, therefore allowing energy harvesting directly from solar radiation. Experimental results show that the proposed system is capable of effective generation of electrical energy.

2019 4th International Symposium on Instrumentation Systems, Circuits and Transducers (INSCIT)

In this work, some experimental results aiming to assess the performance of LoRa modulation are p... more In this work, some experimental results aiming to assess the performance of LoRa modulation are presented taking in consideration two specific scenarios (namely, a dense urban area and a forest environment). These scenarios have been chosen since they are very prone for environment monitoring and protection. The considered LoRa performance criteria are Range, Packet Reception Rate (PR) and Received Signal Strength Indicator (RSSI). The obtained experimental results have provided valuable information on how LoRa modulation can be influenced according to specific environment characteristics as well as combination of them. In addition, experimental results shows that, using a particular LoRA setup, packet loss may be near zero even with a high signal attenuation demonstrating the LoRA robustness feature.

2021 5th International Symposium on Instrumentation Systems, Circuits and Transducers (INSCIT)

IEEE Transactions on Instrumentation and Measurement

Several thermoelectric energy harvesting applications have been introduced recently, showing an i... more Several thermoelectric energy harvesting applications have been introduced recently, showing an increasing interest in thermoelectric energy, mainly using Thermoelectric generators (TEGs) that convert heat directly into electrical energy. Some examples of thermoelectric energy harvesting applications are in the human body, wearable devices, and aircraft. However, several studies and development steps are previously needed to build a complete thermal harvester to prove whether it can generate a useful amount of energy. In this context, a way to early verify the potential of a possible thermal source before building the thermal harvester is needed to save either time or funding resources. In this article, a complete system to verify the capabilities of thermal sources before building the final thermal harvester is presented. The proposed system runs a procedure of simultaneous sampling and emulating thermal gradients, that is, while the temperature gradient of the thermal source under test (TSUV) is sampled, the system emulates this gradient and applies it on a TEG, which can predict the potential of the TSUV. In addition, using long-range-based wireless connectivity, the proposed system operates remotely, meaning that the temperature gradient sampling process can be far away from the temperature gradient emulation process, allowing to evaluate thermal sources in very hard spots, for instance, inside building structures or faraway pipelines. Experimental results show the emulation of two potential thermal sources, namely, tree trunks and the back surface of the photovoltaic modules.