Tiago Semprebom

Tiago Semprebom
Federal Institute of Santa Catarina | IFSC · Grupo de Pesquisa e Desenvolvimento em Sistemas de Telecomunicações

Dr. Eng.

About

24
Publications
3,179
Reads
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92
Citations
Citations since 2016
1 Research Item
39 Citations
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2016201720182019202020212022024681012
2016201720182019202020212022024681012
2016201720182019202020212022024681012
Introduction
Has experience in Computer Science, with emphasis on Real-Time Systems, working mainly on the following topics: Real-time systems, Quality of Service (QoS) and Distributed Systems. I'm the group leader of the Telecommunications Systems Research and Development Group (GSTel). My research interests are: Internet of Thinks (IoT) and Wireless Sensor Networks (WSN).
Additional affiliations
January 2009 - present
Federal Institute of Santa Catarina
Position
  • Professor (Assistant)
February 2005 - June 2012
Federal University of Santa Catarina
Position
  • PhD Student

Publications

Publications (24)
Article
Full-text available
Os dutos de uma instalação de condicionamento de ar é provavelmente o componente que mais contribui para a qualidade de ar dos ambientes. Em uma vasta gama de instalações é comum encontrar dutos em locais de difícil acesso ou até mesmo com acesso impossível para equipamentos de inspeção e limpeza. Dentro deste contexto este trabalho apresenta o des...
Conference Paper
Full-text available
In some Wireless Sensor Network applications the sensor nodes share the same sensing activity, which means that for a considerable number of applications, not all nodes are required to perform sensing tasks during the network lifetime. Sleep-scheduling approaches can be applied in this scenario, enabling that some nodes turn off their radios, savin...
Conference Paper
Full-text available
Many Wireless Sensor Network (WSN) applications operate autonomously in unreliable or inaccessible environments, precluding maintenance or human intervention. Redundant deployment schemes are usually considered in this scenario, making the network resilient to failure and environmental changes. Furthermore, sleep-scheduling techniques can also be a...
Conference Paper
Full-text available
O monitoramento do consumo de energia em instituições públicas é um passo importante para o uso racional dos recursos do cidadão. Este projeto visou a implementação de um sistema de monitoramento de energia no campus IFSC-SJ usando Arduino, rede cabeada com PoE e rede sem fio. Os dados obtidos são armazenados em uma base de dados MySQL e e estarão...
Conference Paper
Full-text available
The IEEE 802.15.4 standard proposes a flexible communication solution for Low-Rate Wireless Personal Area Networks, including Wireless Sensor Networks. In these net-works, the transmission of messages or the Guaranteed Time Slot allocation are coordinated by the traditional CSMA/CA scheme, which does not provide any additional traffic differentiati...
Article
Full-text available
This paper proposes an approach for service differentiation in web servers that preserves the end-to-end mapping in conformance with PHB AF group. This novel approach uses dynamic scheduling techniques and selective discard of requests to achieve a proportional service differentiation. A prototype was built on Apache web server and experiments were...
Article
Full-text available
The IEEE 802.15.4 standard provides a flexible communication support for low-rate wireless personal area networks) applications. When active, the beacon-enabled mode provides a real-time communication to the supported application by adopting a guaranteed time slot (GTS) mechanism. However, this mechanism permits only up to seven real-time communica...
Conference Paper
Full-text available
In some Wireless Sensor Network (WSN) applica-tions, it may be necessary to keep a large number of nodes sensing and transmitting data to a base station in order to have unbiased measurement values. Therefore, in addition to the traditional energy consumption issues, the spatial diversity of the monitored area is another relevant metric to evaluate...
Conference Paper
Full-text available
Resumo—Atualmente, o IEEE 802.15.4/ZigBeé e considerado uma das mais importantes tecnologias utilizadas em Redes de Sensores Sem Fio (RSSF). Nessas redes, as transmissões de mensagens ou aloca ao de GTS (Guaranteed Time Slot) são coordenadas por um mecanismo baseado em CSMA/CA, sem qualquer esquema adicional de diferencia ao de tráfego. Em um traba...
Conference Paper
Full-text available
The main concern in Wireless Sensor Networks (WSN) algorithms and protocols are the energy consumption. Thus, the WSN lifetime is one of the most important metric used to measure the performance of the WSN approaches. Another important metric is the WSN spatial coverage, where the main goal is to obtain sensed data in a uniform way. This paper has...
Conference Paper
Full-text available
The IEEE 802.15.4 standard provides a flexible communication approach for LR-WPAN networks. When active, the beacon-enabled mode allows real-time communication by adopting a GTS (Guaranteed Time Slot) mechanism. However, this mechanism supports only up to seven real-time communicating devices. Motivated by this problem, this paper proposes the use...
Thesis
Full-text available
In the last few years, the use of wireless networks has been increasingly seen in industrial automation and process control. Network Control Systems are examples of driving applications in industrial environments. For these types of applications, support for real-time communications services is one of the major requirements. In traditional approach...
Article
Full-text available
Este artigo introduz uma política de escalonamento de GTSs a fluxos de mensagens de tempo real aplicados a redes IEEE 802.15.4. O modelo nomeado (s,t)-slot garante que ao menos $s$ fluxos de mensagens serão servidos durante um intervalo de tempo t x BI (Beacon Intervals), utilizando um teste de escalonabilidade dinâmico. A avaliação da proposta apr...
Article
Full-text available
O padrão IEEE 802.15.4 oferece uma solução flexível de comunicação para redes LR-WPAN. Quando ativo, o modo com beacon habilita comunicação de tempo real através da adoção de GTS (Guaranteed Time Slot). No entanto, este modo de transmissão suporta apenas que sete dispositivos da rede possam se beneficiar deste recurso em cada superquadro. Este trab...
Article
Full-text available
The IEEE 802.15.4 standard offers a flexible communication solution for low-rate wireless small area networks. When the beacon mode is enabled, real-time communication is possible by using the Guaranteed Time Slots (GTS) mechanism. However, the beacon-enabled mode only supports a maximum of seven GTS allocated in each superframe, preventing other n...
Data
IEEE 802.15.4 is a low power consumption wireless network. When operating in beacon-enabled mode, it divides the superframe in time slots, and real-time communication is possible by using the Guaranteed Time Slots. Other messages are sent by using CSMA/CA. This paper proposes a QoS provision approach for periodic applications that is based on the (...
Conference Paper
Full-text available
IEEE 802.15.4/Zigbee is one of the most widespread Wireless Sensor Network technologies. It may work either in beacon-enabled mode or in beaconless mode. When operating in beacon-enabled mode, it divides the superframe in sixteen equally-sized time slots, where the request for slot allocation is achieved through a CSMA/CA approach. This allocation...
Article
Full-text available
This paper proposes an approach for services differentiation in web servers that preserves the network end-to-end quality of service (QoS) mapping in conformance to per hop behaviour assuring forward group. This novel approach uses dynamic scheduling techniques and selective discard of requests to provide a proportional service differentiation to w...
Data
Full-text available
O padrão IEEE 802.15.4 divide o superquadro em dezesseis compar-timentos igualmente espaçados quando opera no modo com beacon. A aloca ao desses compartimento e realizada através do protocolo de acesso ao meio CSM A/CA. O qual não oferece suporte para mensagens com restri oes tem-porais. Neste trabalho e proposta uma abordagem de provimento de QoS...
Conference Paper
In this paper, adaptive scheduling based on dynamic priorities and imprecise computation is used in web servers. The goal is to keep proportional differentiation services. An approach with admission control has its properties of controllability and predictability evaluated. Another contribution is to show how to use and implement this approach in A...
Article
Full-text available
In this paper, adaptive scheduling based on dynamic priorities and imprecise computation is used in web servers. The goal is to keep proportional differentiation services. An approach with admission control has its properties of controllability and predictability evaluated. Another contribution is to show how to use and implement this approach in A...

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Projects (4)
Archived project
Project
From Applications Layer to MAC Layer.