Formosa, Argentina
Formosa, Argentina

The National University of Formosa is an Argentine national university, situated in the city of Formosa, capital of Formosa Province. Its precursor, the University Institute of Formosa, was established in 1971 as a campus of the National University of the Northeast. Wikipedia.

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Wu C.-M.,Nanhua University | Su H.-K.,National University of Formosa | Yang W.-H.,Hsiuping University of Science and Technology
International Journal of Advancements in Computing Technology | Year: 2011

The IEEE 802.11 standard, currently used in wireless multihop ad hoc networks, wastes bandwidth capacity and energy resources because of many collisions. Previous studies have shown that controlling the contention window size at a given node can decrease its probability of collisions. In this paper, we propose an efficient backoff scheme and evaluate its performance in ad hoc networks. Our backoff mechanism that we devised grants node access to the channel, based on its probability of collision for a transmitted frame in comparison with those nodes in the two-hop contention area. In addition, the new stage minimum contention window size is the previous stage maximum contention window size. We use simulation experiments to evaluate the effective performance of our scheme in an ad hoc network. Our extensive ns-2-based simulation results have shown that the proposed scheme provides excellent performance in terms of bandwidth, energy awareness, end-to-end goodput, as well as packet delivery ratio.

Cabrera M.,National University of Formosa | Andrada A.,National University of the South | Gallez L.,National University of the South
Boletin de la Sociedad Argentina de Botanica | Year: 2014

In order to do an inventory and a flowering calendar based on the plant species available in the native forest of the East of Formosa, the vegetation surveys were carried out in areas of 2 Km2 surrounding 14 apiaries. From the 2009 through the 2012 beekeeping seasons, 198 species of Angiospermae were identified and their blooming was registered. Of these species, 94.5% corresponded to the native flora. Fabaceae, Asteraceae, Solanaceae, Sapindaceae and Polygonaceae were the richest plant families in taxa. The flowering periods lasted from mid August to early April. The maximum flowering supplies were recorded between October and December. Woody species dominated over herbaceous species mainly during the spring, within the three studied seasons. The aquatic and wetlands vegetation was characterized by its long-lasting flowering during the three-year study period. Abundant blooming of the species that integrate the native forest of Formosa is a valuable resource for beekeeping.

Chen P.-H.,National University of Formosa | Chen H.-M.,National Taichung University of Science and Technology
Journal of Convergence Information Technology | Year: 2012

This study incorporated an Android open platform and a physiological measurement module into a mobile healthcare middleware framework integrating multi-interface and multi-parameter monitoring. The proposed framework provides developers with an integrated application system to design a middleware framework for healthcare. This study designs an interface of independent uplink and downlink packet protocol using the Android system and the physiological measurement module to obtain a function for the monitoring of multiple parameters. The proposed system also designs a hardware abstraction layer using Java native interface (JNI) to communicate with transplanted native drivers. Hence, this system used diversified communication methods to provide application software that integrates the monitoring of graphical interfaces and the display of collected numerical data. To integrate with telehealth service systems, this study further transforms the physiological parameters into XML-based healthcare records with compatible CCR standards, to facilitate exchange through a service-oriented architecture (SOA).

Badaracco M.,National University of Formosa | Martinez L.,University of Jaén
Advances in Intelligent Systems and Computing | Year: 2014

An Intelligent Tutor System based on Competency education (ITS-C) aims to personalize teaching processes according to student's competency profile and learning activities by means of artificial intelligence (AI) techniques. One of the most challenging process in ITS-C is the diagnosis process, so far it has been carried out by computerized adaptive tests (CAT) based on item response theory (IRT), in spite of the good performance, its construction requires a hard statistical calibration of a huge bank of items. Such processes are usually intractable in small institutions. To overcome previous difficulties, enhance the accuracy of diagnosis, and the adaptation to student's competence level this contribution proposes the use of teachers' knowledge to replace statistical calibration by modeling such expert's knowledge linguistically using the fuzzy linguistic approach. © Springer-Verlag Berlin Heidelberg 2014.

Badaracco M.,National University of Formosa | Martinez L.,University of Jaén
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) | Year: 2011

An Intelligent Tutoring System (ITS) aims to customize teaching processes dynamically according to student's profile and activities by means of artificial intelligence techniques. The architecture of an ITS defines its components where the pedagogical model is crucial, because the ITS complexity will depend on its scope (specific or generic). Our interest is focused on generic ITS that are very complex due to the fact that could be applied to different educational domains. This contribution proposes an architecture for ITS that uses a Competency-based learning pedagogical model, in order to manage the complexity and make them easier to understand, together a diagnosis process for such a type of systems. © 2011 Springer-Verlag.

Tan C.-T.,National University of Formosa | Chan Y.-S.,National University of Formosa | Chen J.-A.,National University of Formosa | Liao T.-C.,National University of Formosa | Chiu M.-H.,National University of Formosa
Chinese Optics Letters | Year: 2011

A non-scanning, non-interferometric, three-dimensional (3D) optical profilometer based on geometric optics, critical angle principle, and the use of a charge-coupled device (CCD) camera is presented. The surface profile of the test specimen can be transferred into the reflectance profile. The reflectance profile, obtained from a CCD, is the ratio of the intensity at the critical angle to the intensity obtained at the total internal reflection angle. The optical profilometer provides a sub-micron measuring range with nanometer resolution and can be used to measure roughness or surface defects in real time. ©2011 Chinese Optics Letters.

Tan C.-T.,National University of Formosa | Chan Y.-S.,National University of Formosa | Lin Z.-C.,National University of Formosa | Chiu M.-H.,National University of Formosa
Chinese Optics Letters | Year: 2011

We propose a new optical profilometer for three-dimensional (3D) surface profile measurement in real time. The deviation angle is based on geometrical optics and is proportional to the apex angle of a test plate. Measuring the reflectivity of a parallelogram prism allows detection of the deviation angle when the beam is incident at the nearby critical angle. The reflectivity is inversely proportional to the deviation angle and proportional to the apex angle and surface height. We use a charge-coupled device (CCD) camera at the image plane to capture the reflectivity profile and obtain the 3D surface profile directly. © 2011 Chinese Optics Letters.

Badaracco M.,National University of Formosa | Martinez L.,University of Jaén
Expert Systems with Applications | Year: 2013

The Computerized Adaptive Tests (CAT) are common tools for the diagnosis process in Intelligent Tutor System based on Competency education (ITS-C). The item selection process to form a CAT plays a key role because it must ensure the selection of the item that best contributes to student assessment at any time. The item selection mechanisms proposed in the literature present some limitations that decrease the efficiency of CAT and its adaptation to the student profile. This paper introduces a new item selection algorithm, based on a multi-criteria decision model that integrates experts' knowledge modeled by fuzzy linguistic information that overcomes previous limitations and enhances the accuracy of diagnosis and the adaptation of CAT to student's competence level. Finally, such an algorithm is deployed in a mobile tool for an ITS-C. © 2013 Elsevier B.V. All rights reserved.

Hsieh C.-F.,National University of Formosa
Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science | Year: 2010

The gerotor pump is widely used for industrial applications. In this paper, the inner rotor profile is an equidistant epitrochoidal curve, and the outer rotor is generated by the inner rotor profile. This paper discusses an undercutting analysis of the rotor profile, in which the undercutting equations are derived by the theory of gearing. The non-undercutting region is determined by the undercutting curves of the inner and the outer rotors. Numerical examples show that the non-undercutting region on the gerotor profiles only needs to consider the lower part of the undercutting curve of the inner rotor. Besides, the curvature equations of the outer and inner rotors are derived for evaluating the rotor profile properties such as assessing the sealing property and the Hertz stress forecast. The theoretical stress and software simulations proved the stress forecast. The results obtained are important for using the gerotor profile in optimum design.

Kuo W.-K.,National University of Formosa | Chang C.-H.,National University of Formosa
Applied Physics A: Materials Science and Processing | Year: 2011

This paper experimentally compares the intensity and phase detection sensitivities of grating coupling surface plasmon resonance (SPR). A simple air-heating method is proposed to implement tiny refractive index changes. An electro-optic heterodyne interferometer is used to obtain both the intensity and phase curves of the grating coupling SPR device. The transient reflectivity and phase curves during the heating process are recorded. The result shows that the phase detection sensitivity is much better than that of the intensity by an order of magnitude. © Springer-Verlag 2011.

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