Mexico City, Mexico
Mexico City, Mexico
Time filter
Source Type

Guo X.,Sun Yat Sen University | Hernandez-del-Valle A.,SEPI | Hernandez-Lerma O.,CINVESTAV
European Journal of Control | Year: 2012

This paper concerns first passage problems for nonstationary nonlinear discrete-time stochastic control systems. The state and control spaces are general Borel spaces, the transition probabilities are nonstationary, the costs/rewards are time-varying and may be unbounded. The optimal control problem is to minimize the expected discounted costs incurred until the first passage time to some target set, in which the discount factors are allowed to be both time- and state-dependent. Under reasonably mild conditions we establish the so-called first passage optimality equations, and prove that the optimal cost/reward functions satisfy the optimality equations. Furthermore, from the optimality equations we show the existence of optimal Markov policies. © 2012 EUCA.

Leyva-Mayorga I.,SEPI | Rivero-Angeles M.E.,Communication Networks Laboratory | Arellano C.C.,SEPI
Proceedings - International Conference on Advanced Information Networking and Applications, AINA | Year: 2014

Evolution in Wireless Sensor Networks (WSNs) has allowed new applications that led to an increase in the complexity of communication protocols. This in turn has led to the study of additional Quality of Service (QoS) parameters in order to provide an acceptable system performance. As such, hybrid algorithms that allow sensor networks to perform continuous monitoring (CntM) and event driven detection (EDD) duties have proven their value in different environments where emergency alarms are required in addition to a permanent surveillance of the phenomena, specially when considering time-critical applications. Furthermore, priority assignment may help reduce report delay and enhance transmission probability in important packets, specifically when different types of events are considered or certain data from the same event has higher relevance to the end user than the rest of the packets. In this paper, event report delay and energy consumption in a priority-based hybrid WSN protocol is studied using a Markov chain, when considering a two-priority event detection scheme in a hybrid WSN. Results show that, by using different transmission probabilities, assigned to high and low priority data packets, event reporting delay can be reduced, representing better performance for critical-time applications. On the other hand, energy consumption and network lifetime are not affected by the selected priority assignment scheme. © 2014 IEEE.

Ramirez R.I.,SEPI | Rubio E.H.,SEPI | Viveros A.M.,CINVESTAV
23rd International Conference on Electronics, Communications and Computing, CONIELECOMP 2013 | Year: 2013

Mobile devices users have risen in recent years, by convergence of functionality and technology on it. Mobile devices also appear in market as interactive devices where users expects short-time response, usability and functionality. That convergence of digital entertainment, mobile communication technologies, and a set of new capabilities, becomes requirements for mobile application developers and hardware architects, thus both professionals have the dilemma of offer low power consumption and high performance on it. However, both concepts are opposite each other. That means, if I get a great performance, probably have attached high power consumption. Programmers have found in parallel computing, multithreading programming, and process scheduling, the way to achieve more efficiency in their programs. Moreover, hardware architects have found in multicore processors the way to achieve better performance and low-power consumption. This work wants to join both solutions and check if we can achieve less response time in applications and processes, and get a balance between performance and energy consumption. © 2013 IEEE.

Garduno-Nolasco E.,SEPI | Sosa-Pedroza J.,SEPI | Jardon-Aguilar H.,CINVESTAV
Program and Abstract Book - 2010 7th International Conference on Electrical Engineering, Computing Science and Automatic Control, CCE 2010 | Year: 2010

We present the analysis of a quasi circular planar antenna for UWB applications. Analysis includes comparison of coplanar and microstrip feeding. Evolution from the circular antenna requires modifications in the structure and ground plane to soften the edges obtaining improvements in the antenna parameters agreing with the theory proposed by John Kraus. Evolution is performed for a circular antenna with a design frequency of 4.5 GHz with a bandwidth of approximately 20 GHz. The antenna feeding impedance is proposed as 50 ohms, built over a substrate of RF35-A 0.762 mm × 35 mm × 50 mm. The improvements obtained are reflected in the number of resonances of the antenna throughout the operating bandwidth. © 2010 IEEE.

Bejarano F.J.,SEPI | Perruquetti W.,French Institute for Research in Computer Science and Automation | Floquet T.,French Institute for Research in Computer Science and Automation | Zheng G.,French Institute for Research in Computer Science and Automation
IEEE Transactions on Automatic Control | Year: 2015

A method to carry out the state estimation is proposed for a class of nonlinear systems with unknown inputs whose dynamics is governed by differential-algebraic equations (DAE). We achieve, under suitable conditions, to replace the original DAE for a system with differential equations only by using a zeroing manifold algorithm inducing a state space dimension reduction. Observability conditions can be checked using the original system parameters. The state estimation is done using a sliding mode high order differentiator. © 1963-2012 IEEE.

Bejarano F.J.,SEPI | Zheng G.,French Institute for Research in Computer Science and Automation
Automatica | Year: 2014

This paper investigates the observability analysis for linear time systems whose outputs are affected by unknown inputs. Three different definitions of observability are proposed. By introducing the Smith form and comparing the invariant factors, a sufficient condition is deduced for each proposed observability definition. Three examples are given for the purpose of highlighting the effectiveness of the proposed approach.

Bejarano F.J.,SEPI | Zheng G.,French Institute for Research in Computer Science and Automation
Systems and Control Letters | Year: 2016

In this manuscript we give sufficient conditions guaranteeing the observability of singular linear systems with commensurable delays affected by unknown inputs appearing in both the state equation and the output equation. These conditions allow for the reconstruction of the entire state vector using past and actual values of the system output. The obtained conditions coincide with known necessary and sufficient conditions of singular linear systems without delays. © 2015 Elsevier B.V. All rights reserved.

Bejarano F.J.,SEPI | Davila J.,SEPI
Mechanisms and Machine Science | Year: 2015

In this paper a control design is proposed to stabilize a controlled output. It is assumed that only a part of the state vector is known. One part of the disturbances affecting the controlled output is decoupled from it by using feedback, the other part of the disturbances that affects the output, which cannot be decoupled by using feedback, is compensated by using its estimation. An example dealing with the output regulation of a Boeing 767 is presented to illustrate the effectiveness of the proposed methodology. © Springer International Publishing Switzerland 2015.

Bejarano F.J.,SEPI
Systems and Control Letters | Year: 2015

Observability and detectability conditions are obtained for a sort of linear time invariant systems affected by unknown inputs. It is assumed that the system can be described using matrices whose elements are within a principal ideal domain (PID). It is shown that, under suitable hypothesis, the obtained conditions are necessary and sufficient. The analysis is carried out by making use of the Smith normal form of matrices over a PID. The obtained conditions are a generalization of known conditions for particular sorts of systems which are included in those considered here. © 2015 Elsevier B.V. All rights reserved.

Bejarano F.J.,SEPI | Figueroa M.,SEPI | Pacheco J.,SEPI | De Jesus Rubio J.,SEPI
International Journal of Control | Year: 2012

A fault estimator for linear systems affected by disturbances is proposed. Faults appearing explicitly in the state equation and in the system output (actuator faults and sensor faults) are considered. With this design neither the estimation of the state vector nor the estimation of the disturbances is required, implying that the structural conditions are less restrictive than the ones required to design an unknown input observer. Furthermore, the number of unknown inputs (faults plus disturbances) may be greater than the number of outputs. The faults are written as an algebraic expression of a high-order derivative of a function depending on the output. Thus, the reconstruction of the fault signals is carried out by means of a sliding mode high-order differentiator, which requires the derivative of the faults to have a bounded norm. © 2012 Taylor & Francis.

Loading SEPI collaborators
Loading SEPI collaborators