Catálogo de publicaciones - libros

Application of data fusion techniques in new fields brings always up new sets of practical problems. This paper studies the decentralized Kalman filter (DKF) in out-of-sequence (OOSM) and clusterized topology problems, which rise in application to wireless sensor networks. The OOSM problem is closely related to the uncertainty of wireless links. Data may be randomly delayed or completely lost. The possible clusterized topology of large wireless sensor networks raises also problems for DKF. Namely, how much information should be kept in memory, if the sensor node moves from one network cluster to another. The above problems and solutions are discussed and examined in case simulations.

A comprehensive model has been developed to simulate the transient, coupled transport phenomena occurring during a gas metal arc welding process. This includes the arc plasma; melting of the electrode; droplet formation, detachment, transfer, and impingement onto the workpiece; and weld pool fluid flow and dynamics. The fluid flow and heat transfer in both the arc and the metal were simulated and coupled through the boundary conditions at the arc-metal interface at each time step. The detached droplet in the arc and the deformed weld pool surface were found to cause significant changes in the distributions of arc temperature and arc pressure, which are usually assumed to have Gaussian distributions at the workpiece surface. The comprehensive model could provide more realistic boundary conditions to calculate the heat transfer and fluid flow both in the plasma and the metal. The predicted arc plasma distribution, droplet flight trajectory, droplet acceleration and final weld bead shape compared favorably with the published experimental results. This paper was to present the heat transfer and fluid flow in the arc plasma.

—In this paper, a built-in self-repair technique for the MEMS comb accelerometer device is proposed. The main device of the comb accelerometer consists of

—In this work it is presented a generalization on the properties preserved on

Now a days cellular phone companies are facing a lot of problem regarding resource management. Resources for establishing cellular networks are very expensive, Antennas are one these resource. Cellular companies are facing problem regarding proper management of these antennas. In this paper we address the issue of antenna placement problem (APP) to reduce the number of antennas in a specific area. We propose a self tuning algorithm that identifies the location of antennas to be placed in the desired coverage area using minimum number of antennas. Digital Elevation Maps for the proposed coverage area are processed to create a candidate location matrix where antennas can be placed. This matrix provides a mean to isolate areas where antenna deployment is restricted due to Legal or other concerns. This paper utilizes omni directional antennas and provides x, y coordinates of the proposed location in the area of interest.

- We propose a vehicle detection method for traffic flow images obtained from a video camera set up on a low place such as the roadside, sidewalk, etc. The method uses shadows underneath vehicles as the information to detect vehicles. The method distinguishes the size of each vehicle according to the distance between both ends of front- and rear-tires, and discriminates the lanes on which vehicles exist. The method has functions to create and update automatically a background image, and to estimate and update automatically a threshold value to binarize background subtraction images in order to enhance the vehicle detection accuracy. The proposed algorithm can realize a high-speed processing without complicated calculations, and real-time vehicle detection by using a general-purpose personal computer. Experimental results show that the vehicle detection accuracy is 98.9%.

- Infrared imaging devices become more important for civil and military navigation. Noisy images are often a problem especially at poor visibility. Therefore denoising could improve the image quality by wavelet thresholding. Different popular threshold estimation methods are compared with regard to the hard-, soft-, firm- and non-negative garrote thresholding function. Experimental results show that the BayesShrink thresholding estimator applied on the non-negative garrote delivers the best results.

In this article are discussed main results of new intelligent technology for the conformity assessment in application area of agricultural production. In the chain of agricultural production the agricultural product’s properties, which have to be fixed by means of measuring devices, can be so different that there can be no “essence”. Therefore on the basis of modeling of “intellect of consumer ” a new intelligent technology and compact low- cost electronic device “artificial tongue” Logicor-AT has been developed, in order to make sure the conformity assessment and protection of consumers interests and their rights.

The International Electro-technical Commission (IEC) has adopted the function block (FB) concept to define the IEC 61499 standard for the development of distributed industrial control applications. However, even though many researchers have been working during the last years to exploit this standard in factory automation, it is clear that the standard has a long way towards its adoption by the industry. Most practitioners are unfamiliar with the semantics of this standard and even more modifications and extensions are required to the model in order to be effectively used in the context of a process that will addresses the whole life cycle of factory automation systems. This paper surveys research results reported so far about the IEC 61499 model and attempts to highlight the inefficiencies of this paradigm to support the whole development process of distributed control applications as far as the software engineering point of view is considered. Open problems and future challenges are discussed as well.