22 results on '"Moritz, Guilherme"'
Search Results
2. Effects of computerized cognitive training as add-on treatment to stimulants in ADHD: a pilot fMRI study
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de Oliveira Rosa, Virginia, Rosa Franco, Alexandre, Abrahão Salum Júnior, Giovanni, Moreira-Maia, Carlos Renato, Wagner, Flávia, Simioni, André, de Fraga Bassotto, Caroline, R. Moritz, Guilherme, Schaffer Aguzzoli, Cristiano, Buchweitz, Augusto, Schmitz, Marcelo, Rubia, Katya, and Paim Rohde, Luis Augusto
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- 2020
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3. Weighted‐Centroid localization using LoRaWAN network on large outdoor areas.
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Telles, Guilherme Pazetto, Rayel, Ohara Kerusauskas, and Moritz, Guilherme Luiz
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In this work, we show that simple RSSI algorithms as Weighted Centroid (WC) may have similar performance than machine learning methods to estimate node localization in large areas using LoRaWAN. The results are also compared to previous studies on a database provided from the city of Antwerp. [ABSTRACT FROM AUTHOR]
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- 2022
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4. Feasibility trial of the dialectical behavior therapy skills training group as add‐on treatment for adults with attention‐deficit/hyperactivity disorder.
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Moritz, Guilherme R., Pizutti, Leandro T., Cancian, Ana C. M., Dillenburg, Mariana S., Souza, Lucas A. S., Lewgoy, Laura B., Basso, Patrícia, Andreola, Michel M. P., Bau, Claiton H. D., Victor, Marcelo M., Teche, Stefania P., Grevet, Eugênio H., Philipsen, Alexandra, and Rohde, Luis A. P.
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DIALECTICAL behavior therapy , *ATTENTION-deficit hyperactivity disorder , *ADULTS - Abstract
Objective: Our aim was to explore the feasibility, and efficacy of a Dialectical Behavior Therapy Skill Training Group (DBT‐ST) as an add‐on treatment for adult attention‐deficit/hyperactivity disorder (ADHD) in Latin America. Method: Adults with ADHD (n = 31) with stable medication treatment for ADHD and residual symptoms (ASRS > 20) were randomly assigned to DBT‐ST (n = 16) or treatment as usual (TaU; n = 15) for 12 weeks. Feasibility was accessed by attendance and completion rates at 12 weeks. Efficacy outcomes were measured with the ASRS, and performed at 0, 6, 12, and 16 weeks. Results: The DBT‐ST protocol had 81.25% completion rate, with a mean attendance of 87.25% of the sessions. No significant interactions between group and time were detected for outcome measures. Discussion: The DBT‐ST was feasible as add‐on treatment for adult patients with ADHD in Latin America. Replicating previous findings, DBT‐ST has shown no significantly higher improvement in ADHD symptoms in comparison with TaU. Registered at the Clinical Trials database (NCT03326427). [ABSTRACT FROM AUTHOR]
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- 2021
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5. Computerized Cognitive Training for ADHD as an Add-On Treatment to Stimulants: A Randomized Clinical Trial.
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de Oliveira Rosa, Virginia, Moreira-Maia, Carlos Renato, Wagner, Flávia, Simioni, André, de Fraga Bassotto, Caroline, Moritz, Guilherme R., Schmitz, Marcelo, and Rohde, Luis Augusto Paim
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ATTENTION-deficit hyperactivity disorder ,CLINICAL trials ,COGNITIVE training ,HYPERACTIVITY ,HEALTH outcome assessment ,CENTRAL nervous system stimulants ,COGNITION ,NEUROPSYCHOLOGICAL tests ,TREATMENT effectiveness ,RANDOMIZED controlled trials ,STATISTICAL sampling - Abstract
Objective: Computerized cognitive training (CCT) as add-on treatment to stimulants for ADHD core symptoms is scarcely investigated. The purpose of this study is to assess the effect of CCT in a randomized controlled clinical trial for ADHD in children and adolescents treated with stimulants. Method: Fifty-three participants aged 6 to 13 years receiving stimulant treatment and presenting ADHD residual symptoms were randomized either to a CCT (n = 29) or to a controlled nonactive condition (n = 24) for four sessions/week during 12 weeks. The main outcome measure was inattentive symptoms assessed using the Swanson, Nolan, and Pelham-IV (SNAP-IV) Scale. Secondary outcomes include, among others, hyperactive/impulsive symptoms and cognitive tests. Results: There were neither significant group differences on ADHD-inattentive symptoms after the intervention nor on both ADHD-hyperactivity/impulsivity symptoms and cognitive measures. Conclusion: Our study does not provide evidence for the benefits of cognitive training over nonactive training on core ADHD symptoms in medicated ADHD children and adolescents. [ABSTRACT FROM AUTHOR]
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- 2021
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6. Computerized cognitive training in children and adolescents with attention deficit/hyperactivity disorder as add-on treatment to stimulants: feasibility study and protocol description
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Rosa, Virginia de Oliveira, Schmitz, Marcelo, Moreira-Maia, Carlos Renato, Wagner, Flavia, Londero, Igor, Bassotto, Caroline de Fraga, Moritz, Guilherme, Souza, Caroline dos Santos de, and Rohde, Luis Augusto Paim
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cognitive training ,treinamento cognitivo ,treatment ,tratamento ,Attention deficit/hyperactivity disorder (ADHD) ,Transtorno de déficit de atenção/hiperatividade (TDAH) - Abstract
Background Cognitive training has received increasing attention as a non-pharmacological approach for the treatment of attention deficit/hyperactivity disorder (ADHD) in children and adolescents. Few studies have assessed cognitive training as add-on treatment to medication in randomized placebo controlled trials. The purpose of this preliminary study was to explore the feasibility of implementing a computerized cognitive training program for ADHD in our environment, describe its main characteristics and potential efficacy in a small pilot study. Methods Six ADHD patients aged 10-12-years old receiving stimulants and presenting residual symptoms were enrolled in a randomized clinical trial to either a standard cognitive training program or a controlled placebo condition for 12 weeks. The primary outcome was core ADHD symptoms measured using the Swanson, Nolan and Pelham Questionnaire (SNAP-IV scale). Results We faced higher resistance than expected to patient enrollment due to logistic issues to attend face-to-face sessions in the hospital and to fill the requirement of medication status and absence of some comorbidities. Both groups showed decrease in parent reported ADHD symptoms without statistical difference between them. In addition, improvements on neuropsychological tests were observed in both groups – mainly on trained tasks. Conclusions This protocol revealed the need for new strategies to better assess the effectiveness of cognitive training such as the need to implement the intervention in a school environment to have an assessment with more external validity. Given the small sample size of this pilot study, definitive conclusions on the effects of cognitive training as add-on treatment to stimulants would be premature. Resumo Introdução O treinamento cognitivo tem recebido atenção especial como abordagem não medicamentosa para o tratamento do transtorno de déficit de atenção/hiperatividade (TDAH) em crianças e adolescentes. Poucos estudos avaliaram o treinamento cognitivo como abordagem complementar à medicação em ensaios clínicos randomizados controlados por placebo. O objetivo deste estudo foi explorar a viabilidade para a implementação de um programa de treinamento cognitivo computadorizado, descrever suas características principais e potencial eficácia em um pequeno estudo piloto. Métodos Seis pacientes com TDAH entre 10-12 anos de idade, em uso de psicoestimulantes e apresentando sintomas residuais, foram recrutados e randomizados para um dos dois grupos (treinamento cognitivo ou placebo) por 12 semanas. O desfecho principal foram os sintomas nucleares do TDAH avaliados através do Questionário de Swanson, Nolan e Pelham (SNAP-IV). Resultados Encontramos maior resistência do que a esperada no recrutamento dos pacientes em função de problemas logísticos para atender às sessões presenciais no hospital assim como para preencherem os critérios de status medicamentoso e ausência de algumas comorbidades. Ambos os grupos apresentaram diminuição nos escores dos sintomas de TDAH reportados pelos pais, mas sem diferença estatística entre eles. Além disso, foi observada melhora nos testes neuropsicológicos em ambos os grupos – principalmente nas tarefas treinadas pelo programa. Conclusão Este protocolo revelou a necessidade de novas estratégias para melhor avaliar a eficácia do treinamento cognitivo tal como a necessidade de implementar a intervenção no ambiente escolar a fim de obter uma avaliação com maior validade externa. Devido ao pequeno tamanho amostral deste estudo, conclusões definitivas sobre os efeitos do treinamento cognitivo como abordagem complementar aos psicoestimulantes seriam prematuras.
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- 2017
7. Computerized cognitive training in children and adolescents with attention deficit/hyperactivity disorder as add-on treatment to stimulants: feasibility study and protocol description.
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de Oliveira Rosa, Virginia, Schmitz, Marcelo, Moreira-Maia, Carlos Roberto, Wagner, Flavia, Londero, Igor, de Fraga Bassotto, Caroline, Moritz, Guilherme, dos Santos de Souza, Caroline, and Rohde, Luis Augusto Paim
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TREATMENT of attention-deficit hyperactivity disorder ,STIMULANTS ,COGNITIVE training ,COMORBIDITY ,PLACEBOS - Abstract
Copyright of Trends in Psychiatry & Psychotherapy is the property of Associacao de Psiquiatria do Rio Grande do Sul and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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- 2017
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8. Secrecy outage probability of network-coded cooperation without channel state information.
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Monteiro, Marcos E. P., Rebelatto, Joao Luiz, Souza, Richard Demo, Rayel, Ohara K., Moritz, Guilherme Luiz, and Uchoa-Filho, Bartolomeu F.
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- 2015
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9. Network-coded secondary communication with opportunistic energy harvesting.
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Moritz, Guilherme Luiz, Mafra, Samuel Baraldi, Rebelatto, Joao Luiz, Souza, Richard Demo, Uchoa-Filho, Bartolomeu F., and Li, Yonghui
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- 2015
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10. On the performance of network-coded cooperative communications with wireless energy transfer under a realistic power consumption model.
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Moritz, Guilherme Luiz, Rebelatto, Joao Luiz, Souza, Richard Demo, Uchoa-Filho, Bartolomeu F., and Li, Yonghui
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- 2014
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11. A Graph-Based Genetic Algorithm for the Multiple Sequence Alignment Problem.
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Rutkowski, Leszek, Tadeusiewicz, Ryszard, Zadeh, Lotfi A., Zurada, Jacek, Lopes, Heitor S., and Moritz, Guilherme L.
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We developed a new approach for the multiple sequence alignment problem based on Genetic Algorithms (GA). A new method to represent an alignment is proposed as a multidimensional oriented graph, which dramatically decreases the storage complexity. Details of the proposed GA are explained, including new structure-preserving genetic operators. A sensitivity analysis was done for adjusting running parameters of the GA. Performance of the proposed system was evaluated using a benchmark of hand-aligned sequences (Balibase). Overall, the results obtained are comparable or better to those obtained by a well-known software (Clustal). These results are very promising and suggest more efforts for further developments. [ABSTRACT FROM AUTHOR]
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- 2006
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12. Time-Switching Uplink Network-Coded Cooperative Communication With Downlink Energy Transfer.
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Moritz, Guilherme Luiz, Rebelatto, Joao Luiz, Souza, Richard Demo, Uchoa-Filho, Bartolomeu F., and Li, Yonghui
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WIRELESS cooperative communication , *WIRELESS communications , *PROBABILITY theory , *BUDGET , *ENERGY consumption , *SOLAR energy - Abstract
In this work, we consider a multiuser cooperative wireless network where the energy-constrained sources have independent information to transmit to a common destination, which is assumed to be externally powered and responsible for transferring energy wirelessly to the sources. The source nodes may cooperate, under either decode-and-forward or network coding-based protocols. Taking into account the fact that the energy harvested by the source nodes is a function of the fading realization of inter-user channels and user-destination channels, we obtain a closed-form approximation for the system outage probability, as well as an approximation for the optimal energy transfer period that minimizes such outage probability. It is also shown that, even though the achievable diversity order is reduced due to wireless energy transfer process, it is very close to the one achieved for a network without energy constraints. Numerical results are also presented to validate the theoretical results. [ABSTRACT FROM PUBLISHER]
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- 2014
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13. Turbo Decoding Using the Sectionalized Minimal Trellis of the Constituent Code: Performance-Complexity Trade-Off.
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Moritz, Guilherme Luiz, Souza, Richard Demo, Pimentel, Cecilio, Pellenz, Marcelo Eduardo, Uchoa-Filho, Bartolomeu F., and Benchimol, Isaac
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PHONOLOGICAL decoding , *TRELLIS-coded modulation , *SOFTWARE measurement , *COMPLEXITY (Philosophy) , *ALGORITHMS , *BIT error rate measurement - Abstract
The performance and complexity of turbo decoding using rate k/n constituent codes are investigated. The conventional, minimal and sectionalized trellis modules of the constituent convolutional codes are utilized. The performance metric is the bit error rate (BER), while complexity is analyzed based on the number of multiplications, summations and comparisons required by the max-log-MAP decoding algorithm. Our results show that the performance depends on how the systematic bits are grouped in a trellis module. The best performance is achieved when the k systematic bits are grouped together in the same section of the module, so that the log-likelihood ratio (LLR) of the k-bit vector is calculated at once. This is a characteristic of the conventional trellis module and of some of the sectionalizations of the minimal trellis module. Moreover, we show that it is possible to considerably reduce the decoding complexity with respect to the conventional trellis if a particular sectionalization of the minimal trellis module is utilized. In some cases, this sectionalization is found within the best performing group, while in some other cases a small performance loss can be traded off for a large complexity reduction. [ABSTRACT FROM AUTHOR]
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- 2013
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14. Towards Improving TSCH Energy Efficiency: An Analytical Approach to a Practical Implementation.
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Sordi, Marcos A., K. Rayel, Ohara, Moritz, Guilherme L., and Rebelatto, João L.
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ENERGY consumption ,CONSUMPTION (Economics) ,ACCESS control ,WIRELESS communications ,SCHEDULING ,ENERGY harvesting - Abstract
The IEEE 802.15.4-2015 standard defines a number of Medium Access Control (MAC) layer protocols for low power wireless communications, which are desirable for energy-constrained Internet of Things (IoT) devices. Originally defined in the IEEE 802.15.4e amendment, the Time Slotted Channel Hopping (TSCH) has recently been attracting attention from the research community due to its reduced contention (time scheduling) and robustness against fading (channel hopping). However, it requires a certain level of synchronization between the nodes, which can increase the energy consumption. In this work, we implement the Guard Beacon (GB) strategy, aiming at reducing the guard time usually implemented to compensate for imperfect synchronization. Moreover, besides presenting a realistic energy consumption model for a Contiki Operating System-based TSCH network, we show through analytical and practical results that, without the proposed scheme, the power consumption can be more than 13% higher. [ABSTRACT FROM AUTHOR]
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- 2020
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15. A Monitoring System for Online Fault Detection and Classification in Photovoltaic Plants.
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Lazzaretti, André Eugênio, Costa, Clayton Hilgemberg da, Rodrigues, Marcelo Paludetto, Yamada, Guilherme Dan, Lexinoski, Gilberto, Moritz, Guilherme Luiz, Oroski, Elder, Goes, Rafael Eleodoro de, Linhares, Robson Ribeiro, Stadzisz, Paulo Cézar, Omori, Júlio Shigeaki, and Santos, Rodrigo Braun dos
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ONLINE monitoring systems ,PLANT classification ,ENERGY consumption ,ARTIFICIAL neural networks ,ENVIRONMENTAL monitoring ,BUILDING-integrated photovoltaic systems ,HISTORIC buildings - Abstract
Photovoltaic (PV) energy use has been increasing recently, mainly due to new policies all over the world to reduce the application of fossil fuels. PV system efficiency is highly dependent on environmental variables, besides being affected by several kinds of faults, which can lead to a severe energy loss throughout the operation of the system. In this sense, we present a Monitoring System (MS) to measure the electrical and environmental variables to produce instantaneous and historical data, allowing to estimate parameters that ar related to the plant efficiency. Additionally, using the same MS, we propose a recursive linear model to detect faults in the system, while using irradiance and temperature on the PV panel as input signals and power as output. The accuracy of the fault detection for a 5 kW power plant used in the test is 93.09%, considering 16 days and around 143 hours of faults in different conditions. Once a fault is detected by this model, a machine-learning-based method classifies each fault in the following cases: short-circuit, open-circuit, partial shadowing, and degradation. Using the same days and faults applied in the detection module, the accuracy of the classification stage is 95.44% for an Artificial Neural Network (ANN) model. By combining detection and classification, the overall accuracy is 92.64%. Such a result represents an original contribution of this work, since other related works do not present the integration of a fault detection and classification approach with an embedded PV plant monitoring system, allowing for the online identification and classification of different PV faults, besides real-time and historical monitoring of electrical and environmental parameters of the plant. [ABSTRACT FROM AUTHOR]
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- 2020
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16. ICENET: An Information Centric Protocol for Big Data Wireless Sensor Networks.
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Lachowski, Rosana, Pellenz, Marcelo E., Jamhour, Edgard, Penna, Manoel C., Brante, Glauber, Moritz, Guilherme, and Souza, Richard D.
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BIG data ,INFORMATION services ,WIRELESS sensor networks ,INTERNET of things ,COMPUTER network protocols - Abstract
Wireless Sensors Networks (WSNs) are an essential element of the Internet of Things (IoT), and are the main producers of big data. Collecting a huge amount of data produced by a resource-constrained network is a very difficult task, presenting several challenges. Big data gathering involves not only periodic data sensing, but also the forwarding of queries and commands to the network. Conventional network protocols present unfeasible strategies for large-scale networks and may not be directly applicable to IoT environments. Information-Centric Networking is a revolutionary paradigm that can overcome such big data gathering challenges. In this work, we propose a soft-state information-centric protocol, ICENET (Information Centric protocol for sEnsor NETworks), for big data gathering in large-scale WSNs. ICENET can efficiently propagate user queries in a wireless network by using a soft-state recovery mechanism for lossy links. The scalability of our solution is evaluated in different network scenarios. Results show that the proposed protocol presents approximately 84% less overhead and a higher data delivery rate than the CoAP (Constrained Application Protocol), which is a popular protocol for IoT environments. [ABSTRACT FROM AUTHOR]
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- 2019
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17. Smart systems for buildings
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Kalbermatter, Rebeca B., Lima, José, Pereira, Ana I., Ferreira, Ângela P., and Moritz, Guilherme Luiz
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Internet of things ,Smart buildings ,Machine learning ,Domínio/Área Científica::Engenharia e Tecnologia::Outras Engenharias e Tecnologias ,InfluxDB - Abstract
Mestrado de dupla diplomação com a UTFPR - Universidade Tecnológica Federal do Paraná Life in society has initiated a search for comfort and security in social centers. This quest has generated revolutions within the knowledge about the technologies involved, making the environment automated and integrated. Along with this increase, ecological concerns have also arisen, which have been involved since the conception of intelligent structures, remaining throughout their use. Based on these two pillars, the present study aims to cover three central systems inside the apartments of the Apolo Building (Bragança, Portugal). The monitoring of the energy and water consumption and waste disposal systems are integrated by storing the data in a single database in InfluxDB. The data is collected through the sensors and transmitted via Wi-Fi, allowing real-time monitoring through the Grafana application. This data collection makes it possible to track the resident’s behavior through the applied machine learning algorithm. In addition, the collected data should be visible to the resident, bringing together ecological solutions that minimize the expenditure of the building’s resources. Through continuous observation of the data, it will be possible to analyze whether there have been changes in the resident’s behavior through the data presented. Besides dealing only with technical data, this analysis can bring advantages in the search for better ecological awareness of each resident. There is no point in seeking efficient solutions for the building if each resident does not has own actions do not aim at it. A vida em sociedade iniciou uma procura ao conforto e à segurança nos centros sociais. Esta procura gerou revoluções dentro do conhecimento sobre as tecnologias envolvidas, tornando o meio ambiente automatizado e integrado. Juntamente com este aumento, surgiram também preocupações ecológicas, que têm estado envolvidas desde a concepção de estruturas inteligentes, permanecendo ao longo do tempo da sua utilização. Baseado nestes dois pilares, o presente estudo pretende abranger três sistemas centrais no interior dos apartamentos do Edifício Apolo (Bragança, Portugal). A monitorização dos sistemas de consumo de energia, de água e descarte de lixo são integrados através do armazenamento dos dados numa mesma base de dados no InfluxDB. Os dados são coletados através dos sensores e transmitidos via Wi-Fi, permitindo a monitorização em tempo real através da aplicação Grafana. A partir da aquisição desses dados é possível fazer o rastreamento do comportamento do residente através do algoritmo de machine learning aplicado. Além disso, os dados adquiridos devem ser visíveis ao próprio morador, trazendo junto soluções ecológicas que minimizam os gastos dos recursos do edifício. Através da observação contínua dos dados, será possível analisar se houve mudanças de comportamento do morador mediante os dados apresentados. Essa análise, além de tratar apenas dos dados técnicos, pode trazer vantagens na busca por uma melhor consciência ecológica de cada morador. Não só adianta buscar soluções de eficiência ao prédio, se cada morador não tiver sua percepção e atos também voltados a isso.
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- 2022
18. Uma análise entre-camadas de protocolos harq em redes sem fio
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Burich, Mariano Eduardo, Souza, Richard Demo, Brante, Glauber Gomes de Oliveira, Mariano, André Augusto, and Moritz, Guilherme Luiz
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Energy consumption ,Electric engineering ,Engenharia Elétrica ,Energia - Consumo ,Electric power distribution ,ENGENHARIAS::ENGENHARIA ELETRICA::TELECOMUNICACOES::SISTEMAS DE TELECOMUNICACOES [CNPQ] ,Redes locais sem fio ,IEEE 802.11 (Standards) ,Wireless LANs ,Energia elétrica - Distribuição ,IEEE 802.11 (Normas) - Abstract
Este trabalho estuda as potenciais melhorias na eficiência energética e vazão do método híbrido de requisição automática de retransmissão (Hybrid Automatic Retransmission Request, HARQ). A análise inclui as camadas física (PHY) e de acesso ao meio (MAC). É investigada a relação de compromisso gerada pelo HARQ, o qual demanda uma menor potência de transmissão para uma certa probabilidade de falha alvo ao custo de mais acessos ao canal. Uma vez que a competição para acesso ao canal na camada MAC é bastante custosa em termos de energia e atraso, os resultados mostram que a utilização do HARQ leva a uma grande melhoria de performance devido ao menor número de nós competidores – uma consequência da redução na potência de transmissão necessária. Contra-intuitivamente, esta análise leva à conclusão que retransmissões podem diminuir o atraso, melhorando a performance do sistema. Finalmente, são também investigados valores ótimos para o número de retransmissões permitidas, visando maximizar vazão ou/e eficiência energética. This work studies the potential improvements in terms of energy efficiency and throughput of a hybrid automatic retransmission request (HARQ) mechanism. The analysis includes both the physical (PHY) and medium access (MAC) layers. We investigate the trade-off provided by HARQ, which demands reduced transmit power for a given target outage probability at the cost of more accesses to the channel. Since the competition for channel access at the MAC layer is very expensive in terms of energy and delay, our results show that HARQ leads to great performance improvements due to the decrease in the number of contending nodes – a consequence of the reduced required transmit power. Counter-intuitively, our analysis leads to the conclusion that retransmissions may decrease the delay, improving the system performance. Finally, we investigate the optimum values for the number of allowed retransmissions in order to maximize either the throughput or the energy efficiency.
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- 2017
19. Sincronismo eficiente de relógios para redes de sensores sem fio em aplicações orientadas a alarmes
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Nadas, João Pedro Battistella, Souza, Richard Demo, Braga, Sérgio Michelotto, Mafra, Samuel Baraldi, and Moritz, Guilherme Luiz
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Energy consumption ,Engenharia Elétrica ,Energia - Consumo ,Sistemas de comunicação sem fio ,Detectors ,Detectores ,Métodos de simulação ,ENGENHARIAS::ENGENHARIA ELETRICA::TELECOMUNICACOES [CNPQ] ,Wireless communication systems - Abstract
Muitas aplicações de redes de sensores sem fio exigem que nós, além de monitorar certo fenômeno, devem ser capazes de detectar e comunicar eventos assíncronos (e.g. alarmes), o que implica que eles deverão ouvir o meio em modo ocioso, o que é inerentemente um desperdício de energia. Nesse cenário, sincronização de relógio é crucial para operar com eficiência em ciclos de trabalho e minimizar o consumo de energia. Nesta dissertação, avaliamos o impacto do \textit{trade-off} entre a energia gasta com sincronizações mais frequentes e, em troca reduzir a janela de escuta ociosa necessária para que a confiabilidade desejada da comunicação seja atingida. A frequência ideal de sincronizações é obtida analiticamente e corroborada por resultados numéricos, mostrando que é possível gastar uma pequena fração da energia total com uma rede com sincronização mais precisa quando comparada com a manutenção da precisão do relógio mínima exigida pelo fenômeno que está sendo monitorado, aumentando significativamente a vida útil da rede. Além disso, uma solução fechada para o limite superior a este número ideal é derivada através da aproximação de que a energia gasta para transmitir ser muito menos significativa quando comparada à gasta para receber. Usando este resultado, pudemos prever através de simulações que este número ideal será aumentado pela energia de escuta, o número de vezes que um nó precisa ouvir o meio à espera de alarmes, ao nível de confiança em que o sistema foi concebido para trabalhar, ao intervalo de sincronização e à variância da frequência de oscilação relativa entre os nós. Por outro lado, este número será menor quando o custo energético de sincronização for maior (i.e. Quando a energia de comunicação aumentar). Many applications of wireless sensor networks require that nodes, besides monitoring a given phenomenon, must be able to detect and communicate asynchronous events (e.g. alarms), implying that they have to often listen to the medium in idle mode, which is inherently energy wasteful. In such a scenario time synchronization is crucial to efficiently operate in duty-cycles and minimize energy consumption. In this work we assess the impact of the trade-off between spending energy with more frequent synchronizations and in return saving it by reducing the idle listening window necessary for the desired reliability of the communication. The optimal frequency of time synchronizations is obtained analytically and corroborated by numerical results, showing that several times less overall energy may be spent with a finer synchronization when compared with maintaining the minimum clock precision required by the phenomenon being monitored, greatly extending the life-span of the network.Furthermore, a closed form upper bound to this optimal number is derived by approximating transmit power being of much more significance when compared to receive power. Using this result, we predict and then simulate that this optimal number will be increased by the listening power, the number of times which a node has to listen to the medium idly, the level of confidence at which the system is designed to work, the synchronization interval and the variance of the relative oscillation frequency between synchronizing nodes. On the other hand, this number will be smaller when the energy cost of synchronization is higher (e.g. when active communication energy increases).
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- 2016
20. Human and Small Animal Detection Using Multiple Millimeter-Wave Radars and Data Fusion: Enabling Safe Applications.
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Mattos ABRC, Brante G, Moritz GL, and Souza RD
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- Animals, Humans, Reproducibility of Results, Energy Transfer, Radar, Algorithms, Privacy
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Millimeter-wave (mmWave) radars attain high resolution without compromising privacy while being unaffected by environmental factors such as rain, dust, and fog. This study explores the challenges of using mmWave radars for the simultaneous detection of people and small animals, a critical concern in applications like indoor wireless energy transfer systems. This work proposes innovative methodologies for enhancing detection accuracy and overcoming the inherent difficulties posed by differences in target size and volume. In particular, we explore two distinct positioning scenarios that involve up to four mmWave radars in an indoor environment to detect and track both humans and small animals. We compare the outcomes achieved through the implementation of three distinct data-fusion methods. It was shown that using a single radar without the application of a tracking algorithm resulted in a sensitivity of 46.1%. However, this sensitivity significantly increased to 97.10% upon utilizing four radars using with the optimal fusion method and tracking. This improvement highlights the effectiveness of employing multiple radars together with data fusion techniques, significantly enhancing sensitivity and reliability in target detection.
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- 2024
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21. Computerized cognitive training in children and adolescents with attention deficit/hyperactivity disorder as add-on treatment to stimulants: feasibility study and protocol description.
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Rosa VO, Schmitz M, Moreira-Maia CR, Wagner F, Londero I, Bassotto CF, Moritz G, de Souza CDS, and Rohde LAP
- Subjects
- Attention Deficit Disorder with Hyperactivity diagnostic imaging, Attention Deficit Disorder with Hyperactivity physiopathology, Attention Deficit Disorder with Hyperactivity psychology, Brain diagnostic imaging, Brain physiopathology, Child, Clinical Protocols, Combined Modality Therapy, Comorbidity, Feasibility Studies, Female, Follow-Up Studies, Humans, Magnetic Resonance Imaging, Male, Neuropsychological Tests, Patient Selection, Pilot Projects, Psychotropic Drugs therapeutic use, Single-Blind Method, Treatment Outcome, Attention Deficit Disorder with Hyperactivity therapy, Central Nervous System Stimulants therapeutic use, Cognitive Remediation methods, Therapy, Computer-Assisted
- Abstract
Background: Cognitive training has received increasing attention as a non-pharmacological approach for the treatment of attention deficit/hyperactivity disorder (ADHD) in children and adolescents. Few studies have assessed cognitive training as add-on treatment to medication in randomized placebo controlled trials. The purpose of this preliminary study was to explore the feasibility of implementing a computerized cognitive training program for ADHD in our environment, describe its main characteristics and potential efficacy in a small pilot study., Methods: Six ADHD patients aged 10-12-years old receiving stimulants and presenting residual symptoms were enrolled in a randomized clinical trial to either a standard cognitive training program or a controlled placebo condition for 12 weeks. The primary outcome was core ADHD symptoms measured using the Swanson, Nolan and Pelham Questionnaire (SNAP-IV scale)., Results: We faced higher resistance than expected to patient enrollment due to logistic issues to attend face-to-face sessions in the hospital and to fill the requirement of medication status and absence of some comorbidities. Both groups showed decrease in parent reported ADHD symptoms without statistical difference between them. In addition, improvements on neuropsychological tests were observed in both groups - mainly on trained tasks., Conclusions: This protocol revealed the need for new strategies to better assess the effectiveness of cognitive training such as the need to implement the intervention in a school environment to have an assessment with more external validity. Given the small sample size of this pilot study, definitive conclusions on the effects of cognitive training as add-on treatment to stimulants would be premature.
- Published
- 2017
- Full Text
- View/download PDF
22. A distributed approach for a multiple sequence alignment algorithm using a parallel virtual machine.
- Author
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Lopes H and Moritz G
- Abstract
Multiple sequence alignment is a central topic of extensive research in computational biology. Basically, two or more protein sequences are compared so as to evaluate their similarity. This work reports a methodology for parallel processing of a multiple sequence alignment algorithm (ClustalW) in an environment of networked computers. A detailed description of the modules that compose the distributed system is provided, giving special attention to the way a dynamic programming algorithm can be executed in parallel. Extensive experiments were done to evaluate performance and scalability of the method. Results show that the proposed method is efficient and offers a real advantage for large-scale multiple protein sequence alignment.
- Published
- 2005
- Full Text
- View/download PDF
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