Encontrados 26 documentos, a visualizar página 1 de 3
Pre-diabetes alters testicular PGC1-α/SIRT3 axis modulating mitochondrial bioen...
Rato, Luis; Duarte, Ana I.; Tomás, Gonçalo D.; Santos, M. S.; Moreira, Paula I.; Socorro, Silvia; Cavaco, José E.; Alves, Marco G.; Oliveira, Pedro F.Pre-diabetes, a risk factor for type 2 diabetes development, leads to metabolic changes at testicular level. Peroxisome proliferator-activated receptor γ coactivator 1α(PGC-1α) and Sirtuin 3 (Sirt3) are pivotal inmitochondrial function. We hypothesized that pre-diabetes disrupts testicular PGC-1α/Sirt3 axis, compromising testicular mitochondrial function. Using a high-energy-diet induced pre-diabetic rat model,...
Multivariable and distributed LQG control of a water delivery canal
Lemos, João; Pinto, Luís; Rato, Luís; Rijo, ManuelThis work addresses the problem of the development of a distributed LQG controller for a water delivery canal. The control structure proposed relies on a set o LQG control agents interconnected through a communication network. Each of these local control agents controls a canal reach made of a pool and the corresponding downstream gate and receives information (output signal and control moves) only from the cor...
Actuator Fault Tolerant LQG Control of a Water Delivery Canal
Lemos, João; Sampaio, Inês; Rijo, Manuel; Rato, LuísThe problem of reconfiguration of the control system to mitigate the effects of actuator faults in a water delivery canal is addressed in this paper. When a fault in an actuator is detected and isolated, the controller is reconfigured by changing the set of manipulated and process variables and using a different controller, associated to a different plant model, in a hybrid systems framework. In order to preven...
Pasture digital image analysis as a support tool for grazing management in mont...
Rato, Luis; Ferraz de Oliveira, M Isabel; Sales-Batista, ElviraThe knowledge of vegetation land cover over time is essential for an appropriate grazing management in any free range animal production system. Ground vegetation has traditionally been monitored using visual methods that produce estimates of percentage covered/bared soil, green/senescent vegetation and also grasses/forbs occurrences. Visual methods are extremely time consuming and prone to observer bias. The us...
Improving Performance of Classifiers using Rotational Feature Selection Scheme
Bhowmick, Shib Sankar; Saha, Indrajit; Rato, Luis; Bhattacharjee, DebotoshThe crucial points in machine learning research are that how to develop new classification methods with strong mathematic background and/or to improve the performance of existing methods. Over the past few decades, researches have been working on these issues. Here, we emphasis the second point by improving the performance of well-known supervised classifiers like Naive Bayesian, Decision Tree and k-Nearest Nei...
RotaSVM: A New Ensemble Classifier
Bhowmick, Shib Sankar; Saha, Indrajit; Rato, Luis; Bhattacharjee, DebotoshIn this paper, an ensemble classifier, namely RotaSVM, is proposed that uses recently developed rotational feature selection approach and Support Vector Machine classifier cohesively. The RotaSVM generates the number of predefined outputs of Support Vector Machines. For each Support Vector Machine, the training data is generated by splitting the feature set randomly into S subsets. Subsequently, principal compo...
Experimental application to a water delivery canal of a distributed MPC with st...
Lemos, João; Igreja, José; Cadete, Fernando; Rijo, Manuel; Rato, LuísIn this work, a novel distributed MPC algorithm, denoted D-SIORHC, is applied to upstream local control of a pilot water delivery canal. The D-SIORHC algorithm is based on MPC control agents that incorporate stability constraints and communicate only with their adjacent neighbors in order to achieve a coordinated action. Experimental results that show the effect of the parameters configuring the local controlle...
Control of a water delivery canal with cooperative distributed MPC
Igreja, J.M.; Lemos, João; Cadete, F.M.; Rato, Luís; Rijo, ManuelThis article addresses the problem of controlling pool levels in a water delivery canal using a novel cooperative distributed MPC control algorithm that incorporates stability constraints. According to a distributed control strategy, a local control agent is associated to all canal gates (actuators). In order to achieve cooperative action, each control agent computes the corresponding gate position (manipulated...
Distributed LQG control of a water delivery canal with feedforward from measure...
Lemos, João; Pinto, Luís; Rato, Luís; Rijo, ManuelThis work addresses the design of distributed LQG controllers for water delivery canals that include feedforward from local farmer water consumptions. The proposed architecture consists of a network of local control agents, each connected to one of the canal pools and sharing information with their neighbors in order to act in a coordinated way. In order to improve performance, the measurement of the outflows f...
Fault Tolerant Reconfigurable Control of a Water Delivery Canal - Actuators Faults
Sampaio, Inês; Lemos, João; Rato, Luís; Rijo, ManuelThis work addresses the problem of designing fault tolerant controllers for a water delivery canal that tackle actuators faults. The type of faults considered consists of blocking of one of the gates. The detection of the fault is made by comparing the gate position command with the actual (measured) gate position. Both centralized and distributed controllers are made for local upstream water level control. Cen...
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