DME - Artigos em Revistas Internacionais / Articles in International Journals
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Browsing DME - Artigos em Revistas Internacionais / Articles in International Journals by Author "Cabral, João"
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- Facility Localization: Strategic Decision on Insular TerritoryPublication . Frias, Armindo Dias da Silva; Cabral, JoãoThe global market advent, with consumers, that requires speed, quality of service and respect for the environment came to dictate the change of some imposed paradigms. We are seeing the integration of internal and external supply chains following the customers concerns about the environment and social friendly processes, making it sustainable. The collection and treatment of waste in the islands have great economic, social and environmental importance. Several critical points, such as transport, storage and processing must be integrated. By its growing influence on the performance on the majority of economy sectors, freight transport is assumed to be one of the activities with the greatest importance. The location of facilities or infrastructure is a critical factor for the public or private organizations. The decision-making process of its location falls within strategic and when is situated in insular space must meet their specific characteristics of sustainability.With the objective of analyzing the configuration and performance of the reverse logistics chain implemented for waste collection and treatment, in concerns to facilities location, we performed a study based in secondary data, regarding to the used tires collection in the São Miguel Azorean island.From the implementation of the developed facilities location model, taking also the solution already implemented we developed several alternative possible scenarios. The results obtained meet the empirical expectations, and despite not corroborate the implemented solution as great, for the case of a collection facility, consider the actual one as acceptable. It is made a proposal to improve the implemented collection of used tiers network.The optimization of the transport network, by the correct facilities location, allows the minimization of economic costs, social impacts and the polluting emissions caused by means of transport, or by the conditions of storage of waste. We conclude, trough the mathematical model that the obtained model is appropriate, getting close to the already implemented solution. Also, the conducted study, serves as a datable application to other similar problems.
- Finding entrepreneurship in students: a case study on the graduation of tourism in Azores UniversityPublication . Cabral, JoãoSometimes the student only needs the teacher fires the spark that ignites a whole new set of ideas and will to do something different, giving their own contribution to the development of new concepts in knowledge. The author in this article shows how a simple discipline of Informatics for Tourism, with sometimes boring concepts to the students, with a scheduled change toward the application in Tourism changed the motivation and helped to implemented team work and development of new ideas in tourism in Azores. This results intend to be a beacon, and an help to improve the techniques of teaching, showing that indeed the student have a lot potential inside and they have the power to develop new ideas. They need only need a small push on the right direction.
- The flipped-broadcast learning system, application on AzoresPublication . Cabral, João; Nunes, JerónimoOn this work we suggest a teaching solution that can be implemented in Azores, an archipelago of nine islands of Portugal, based in already known system of e-learning, with a twist based on the flipped method. Structured in a cooperative way, the organization of the system allows to isolated groups of people to have access to a certain level of teaching, if they cannot have the possibility to have physical presence in school due to problems emerging from territory discontinuity. Our suggestion can be elaborate in a model that can be adapted to any level of education, and can be adapted also in cases that a cut of budget exists. We suggest the name of fb-learning: Flipped Broadcast Learning.
- Glimpses of Scientific Mathematic Modules in High SchoolPublication . Cabral, JoãoThe introduction of advanced scientific modules to support teaching has an important fundamental in mathematics education. But this kind of introduction collides with the lack of time that the teachers of High School have to develop new strategies and implement them, because they are attached, in Portugal, to a bureaucratic machine that consumes valuable time that could be invested in education. Didactic concepts and scientific content must work together like a gear of knowledge. The didactic knowledge allows introducing concepts that are later explored scientifically enabling educational expansion, which will be reflected in the student's creativity. We assist to a dialectical progression knowledge, which will have immediate effects on motivation and capture the attention by those who learn, so in this work we present a model to introduce some advanced Scientific Modules from some graduations of University Mathematics curriculum in Portuguese High Schools.
- Harvesting dynamic aspects from a real rational map : the bulb of period 5Publication . Cabral, JoãoThis work is a small, but strong, contribute to understand better the behavior, under iteration, of the Real Rational Map, f(x)=(x²-a)/(x²-b), with 0
- Hunting Admissible Kneading pairs of a Real Rational MapPublication . Cabral, JoãoThe importance of symbolic systems is that they give us the possibility of simplifying some dynamical systems. Our expectations is that our work can help to understand better the behavior, under iteration, of the Real Rational Map, f(x)=(x²-a)/(x²-b), with 0
- Mapping stability : real rational maps of degree zeroPublication . Cabral, João; Martins, Maria do CarmoIn memory of our beloved Professor José Rodrigues Santos de Sousa Ramos (1948-2007), who João Cabral, one of the authors of this paper, had the honor of being his student between 2000 and 2006, we wrote this paper following the research by experimentation, using the new technologies to capture a new insight about a problem, as him so much love to do it. His passion was to create new relations between different fields of mathematics. He was a builder of bridges of knowledge, encouraging the birth of new ways to understand this science. One of the areas that Sousa Ramos researched was the iteration of maps and the description of its behavior, using the symbolic dynamics. So, in this issue of this journal, honoring his memory, we use experimental results to find some stable regions of a specific family of real rational maps, the ones that he worked with João Cabral. In this paper we describe a parameter space (a,b) to the real rational maps fa,b(x) = (x2 −a)/(x2 −b), using some tools of dynamical systems, as the study of the critical point orbit and Lyapunov exponents. We give some results regarding the stability of these family of maps when we iterate it, specially the ones connected to the order 3 of iteration. We hope that our results would help to understand better the behavior of these maps, preparing the ground to a more efficient use of the Kneading Theory on these family of maps, using symbolic dynamics.
- Modeling Movement of Tourists : Tools and Application in São Miguel Island, PortugalPublication . Frias, Armindo Dias da Silva; Cabral, João; Costa, ÁlvaroTourism contributes to the development of many regions. Different factors affect the movement of tourists within a destination. Those factors are related to the tourist characteristics, like the time budgets, preferences or destination knowledge, and to the destination features, like the attraction characteristics or accessibility level. Tourist decisions aren’t always done in a rational way. Emotions add further complexity to the human decision process. The use of footpaths can play an important role in the satisfaction of tourists, helping them discover the territory and giving them access to different types of attractions. The existence of a mathematical model that integrates the main factors related to the movement of independent tourists within a destination, in a dynamic way, will make possible the creation of an adaptable software tool. This tool will meet the specific needs of tourists, allowing the use of the network in an optimal way by the different tourist profiles, and the needs of the regional government and business, permitting better decisions and the offer of relevant tourism products. This article identifies the main tourists’ mobility criteria in the São Miguel island territory, Azores, Portugal, recognizes the necessary modelling process and identifies the basis for the construction of the mathematical model that explains the movement of tourists within the destination.
- Obtaining Data Values from Tourist PreferencesPublication . Frias, Armindo Dias da Silva; Raskova, Erza; Costa, Álvaro; Cabral, JoãoSatisfied customers are the main sustainability factor for the viability of any activity, and tourism has increasing relevance to the global economy and the economic development of many regions. In order to create better matches between tourist demands and preferences and the local supply, an understanding of tourists as decision makers is necessary. The aim of this work is to introduce a mathematical model that explains the decision-making process of tourists, other consumers, and tourism business managers. We used a mathematical model, taking into consideration the preferences of individuals and their strengths during the exploration and use of tourism resources. The integration of preferences into an IT tool provided extra support to the decisions of tourists and allowed better choices to be made in the execution of travel plans. In addition, the model can be used by resource managers. Understanding how tourists make decisions in each different situation can improve the allocation of available resources to satisfy their expectations. The proposed model is also adaptable to situations where it is necessary to decide among different options with a high degree of complexity.
- A survey about experiments on notions of time in children k-1 and k-2Publication . Silva, Vânia; Cabral, JoãoIn this paper we explore the importance of analyzing the exercises that the manuals have in Mathematics study, because the difficulty of identifying some errors on them can interfere with the capabilities of children. We work with some exercises related to the theme of temporal notions, based on a survey of textbooks from the 1st and 2nd grade (K-1 and K-2). Our concern is to alert about the importance of reflecting on the content of the books, in order to promote a teaching-learning process tailored to the needs of children. The activities present in the manuals should allow children to develop their logical- mathematical reasoning, for later be able to understand and apply Mathematics. To this end, we present some reflection about the exercises of manuals, and we give our opinion about what is the correct and incorrect. Also, some activities are suggested, among which were implemented with children of the 2nd grade, K- 2, along the experiments that support our work.