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2. An Integrated Progressive Hedging and Benders Decomposition With Multiple Master Method to Solve the Brazilian Generation Expansion Problem.

Author

Soares, Alessandro, Street, Alexandre, Andrade, Tiago, and Garcia, Joaquim Dias

Subjects
DECOMPOSITION method, SPOT prices, URBAN growth, STOCHASTIC processes
Abstract

This paper exploits the decomposition structure of the large-scale hydrothermal generation expansion planning problem with an integrated modified Benders Decomposition and Progressive Hedging approach. We consider detailed and realistic data from the Brazilian power system to represent hourly chronological constraints based on typical days per month and year. Also, we represent the multistage stochastic nature of the optimal hydrothermal operational policy through co-optimized linear decision rules for individual reservoirs. Therefore, we ensure investment decisions compatible with a nonanticipative (implementable) operational policy. To solve the large-scale optimization problem, we propose an improved Benders Decomposition method with multiple instances of the master problem, each of which strengthened by primal cuts and new Benders cuts generated by each master’s trial solution. Additionally, our new approach allows using Progressive Hedging penalization terms for accelerating the convergence of the method. We show that our method is 60% faster than the benchmark. Finally, the consideration of a nonanticipative operational policy can save 7.64% of the total cost (16.18% of the investment costs) and significantly improve spot price profiles. [ABSTRACT FROM AUTHOR]

Published
2022
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7. Optical and wireless network convergence in 5G systems – an experimental approach

Author

Marques, Paulo, primary, do Carmo, Alexandre P., additional, Frascolla, Valerio, additional, Silva, Carlos, additional, Sena, Emanuel D. R., additional, Braga, Raphael, additional, Pinheiro, Joao, additional, Astudillo, Carlos A., additional, de Andrade, Tiago P. C., additional, Gama, Eduardo S., additional, Bittencourt, Luiz F., additional, Villas, Leandro A., additional, Madeira, Edmundo R. M., additional, da Fonseca, Nelson L. S., additional, Both, Cristiano, additional, Lando, Gabriel, additional, Schimuneck, Matias, additional, Wickboldt, Juliano, additional, Trevisan, Ana P. V., additional, de Jesus Martins, Rafael, additional, Vassallo, Raquel F., additional, de Queiroz, Felippe M., additional, Picoreti, Rodolfo, additional, Gomes, Roberta L., additional, Dominicini, Cristina K., additional, Garcia, Victor, additional, Guimaraes, Rafael S., additional, Villaca, Rodolfo, additional, Martinello, Magnos, additional, Ribeiro, Moises R.N., additional, Macedo, Daniel F., additional, Silva, Vinicius F., additional, Guimaraes, Julio C. T., additional, Colman-Meixner, Carlos, additional, Nejabati, Reza, additional, Simeonidou, Dimitra, additional, Zhang, Yi, additional, Slyne, Frank, additional, Alvarez, Pedro, additional, Collins, Diarmuid, additional, Ruffini, Marco, additional, DaSilva, Luiz A., additional, and Marquez-Barja, Johann M., additional

Published
2018
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15. Protocols for Wireless Sensors Networks Connected by Radio-Over-Fiber Links.

Author

de Andrade, Tiago P. C., da Fonseca, Nelson L. S., Villas, Leandro A., and Branquinho, Omar C.

Abstract

Radio-over-fiber (RoF) technology has been employed in network infrastructure due to its large capacity, low attenuation, and low operational costs, as well as due to the possibility of enlarging network coverage. This paper introduces a new approach for the interconnection of wireless sensor network (WSN) by employing RoF links, specifically wireless sensor network based on radio-over-fiber (WSN-RoF). The main contribution of this paper is the introduction of an architecture for the interconnection of WSN and two medium access control (MAC) protocols exclusively tailored to WSN-RoF architecture: scheduling of polling priority MAC and dynamic hybrid MAC for WSNs based on RoF access infrastructure. Both protocols deal with the main problems in WSN-RoF, i.e., the round-trip propagation delay in optical fiber links and the existence of two distinct collision domains: one wireless and the other optical. The performance of these two protocols shows their effectiveness in the interconnection of WSN through RoF links. Results of experiments demonstrate the benefits of using RoF links for the backhaul of WSN. [ABSTRACT FROM PUBLISHER]

Published
2018
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19. On the use of a 3D printer in mechatronics projects

Author

Abreu, Paulo, primary, Restivo, Maria Teresa, additional, Quintas, Manuel Rodrigues, additional, de Fatima Chouzal, Maria, additional, Santos, Bruno Filipe, additional, Rodrigues, Jose, additional, and Andrade, Tiago Faustino, additional

Published
2014
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22. The Random Access Procedure in Long Term Evolution Networks for the Internet of Things.

Author

Andrade, Tiago P. C. De, Astudillo, Carlos A., Sekijima, Luiz R., and Fonseca, Nelson L. S. Da

Subjects
*LONG-Term Evolution (Telecommunications), *NETWORK PC (Computer), *INTERNET of things, *PACKET transport networks, *RESOURCE allocation, *MANAGEMENT
Abstract

Network connectivity is a key issue in the realization of IoT, and LTE cellular technology is the most promising option for the provisioning of such connectivity. However, in LTE networks, a large number of IoT devices trying to access the medium can overload the RAN. In this article, we review the LTE random access procedure and its support for IoT applications. We also assess the performance of the RAN overload control schemes proposed by 3GPP, taking into consideration the interaction between the random access procedure and packet downlink control channel resource allocation. [ABSTRACT FROM PUBLISHER]

Published
2017
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38. HMARS: A MAC Protocol for Integration of Radio-over-Fiber and Wireless Sensor Networks.

Author

Pedroso da Cruz de Andrade, Tiago, Barbosa e Oliveira, Leonardo, Saldanha da Fonseca, Nelson Luis, and Carvalho Branquinho, Omar

Abstract

Radio-over-Fiber (RoF) has been employed in network infrastructures due to its large capacity, low attenuation, low operational cost and enlarged network coverage. Wireless Sensor Networks (WSNs) has also been broadly deployed. The integration of these two powerful technologies leads to new infrastructures. In this work, we introduce new approach for integrating of RoF and WSNs, and present HMARS, a MAC protocol proposed exclusively for this new type of integration. Our results indicate that HMARS performs considerable better than others MAC protocols in this integration. [ABSTRACT FROM PUBLISHER]

Published
2012
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39. Remote demo for encoders' tutorial.

Author

Andrade, Tiago Faustino, Quintas, Manuel Rodrigues, and Restivo, Maria Teresa

Abstract

This work is focused on the use of a microcontroller solution for an easy, costless and reliable system for online experiments addressed to demonstrate small experimental tutorial systems in engineering education and in lifelong learning. The specific application described in this work will be demonstrated in the Exhibition Session of exp.at'13 and is dedicated to the digital encoder topic. [ABSTRACT FROM PUBLISHER]

Published
2013
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