http://repositorio.ufc.br/handle/riufc/4775 2026-04-12T15:28:43Z 2026-04-12T15:28:43Z Almendra, Camilo Camilo http://repositorio.ufc.br/handle/riufc/13615 2019-01-03T16:11:05Z 2003-01-01T00:00:00Z

Título: Administração remota de ambientes virtuais em rede para integração com sistemas de gerenciamento de aprendizado Autor(es): Almendra, Camilo Camilo Abstract: Recently, the potential of the Internet as a low-cost means of communication and global reach has enabled a new form of distance learning. In that revolution, the learning management systems stand out, through which it is can manage the various aspects involved in the provision of courses away. Virtual reality has, in parallel to the evolution of distance education, experienced considerable expansion throughout the world, and has been highlighted by present several positive aspects for its use in education. One of the types promising applications are networked virtual environments, which, when allowing integration of virtual worlds and interaction of remote users in environments shared three-dimensional, open the prospect of being used in support of distance education. An integration of learning management systems and environments virtual network is therefore an interesting alternative for increasing the education programs at a distance. This integration enables various solutions already developed around the use of virtual reality to education can now be effectively made available more widely, through the wide base learning environments based on the Internet. In this paper, we present two important aspects of integration between virtual environments and network systems learning management, which are the management of real-time services and remote administration features. This observation led to the specification and modeling an interface for remote management of virtual environments network from learning management systems. Thus, we aimed to build a model easy integration to be incorporated and does not take into account specific aspects of internal architecture of each system type. As a case study, the interface set remote administration has been incorporated into a virtual environment facing network to education. Tipo: Dissertação

2003-01-01T00:00:00Z Pinheiro, Tânia Saraiva de Melo http://repositorio.ufc.br/handle/riufc/13325 2019-01-03T16:15:01Z 2012-01-01T00:00:00Z

Título: Revisão do instrumento de avaliação de cursos adotado pelo INEP/MEC na perspectiva da graduação na modalidade a distância Autor(es): Pinheiro, Tânia Saraiva de Melo Abstract: The fast increase in the number of higher education enrollments requires new strategies do assess its quality. The current assessment policy, the National System for Assessment of Higher Education, establish external evaluative processes for institutions, courses and students. In 2006, the first instrument for external evaluation of courses was developed and frequent updates have been presented since then. This research hypothesized that the current external evaluation instrument needed to be revised to better address the complexity of distance learning courses. Its main objective is to propose improvements in the official instrument to assess high education courses, from the distance learning point of view. Four specific objectives have been established: analyze the public policies evolution in regard to its procedures and instruments; identify an educational evaluation model in accordance with the Brazilian context; identify the specific characteristics of distance learning courses not covered by the existing instrument; propose and validate a new version of the instrument used by INEP/MEC for evaluation of distance courses. The methodological approach consisted of a three-cycle incremental development, each with specific goals and research techniques. The first cycle outlined the basic framework, selecting a program evaluation model compatible with higher education assessment policies. The second searched the particular teaching conditions of distance education courses to be included in the instrument being reformulated. The final cycle validated the proposal. As a result, the data analyzed was not enough to confirm the hypothesis that the library indicators should be revised, but has corroborated the other ones, mainly related to the need of revision of faculty´s role in distance education courses. The presentation of the new set of indicators considered not only its content but also the organization of information presented in order to improve their understanding and use in distance learning courses. Tipo: Tese

2012-01-01T00:00:00Z Braga, Antonio Rafael http://repositorio.ufc.br/handle/riufc/13308 2022-03-11T14:09:34Z 2012-01-01T00:00:00Z

Título: ElasticCluster: explorando a ociosidade de clusters virtuais para execução de aplicações do tipo saco de tarefas Autor(es): Braga, Antonio Rafael Abstract: In cloud computing, elasticity and capacity of load isolation allow their resources to be provisioned and released in response to dynamic workloads with reduced downtime. These characteristics are typical of clusters hosted in a cloud (virtual cluster - VC), so that these resources need to be managed in order to minimize its waste in cloud providers and ensure that resource performance is not adversely affected. This work proposes a policy for dynamic adaptation of virtual clusters (VCs) to reduce the number of idle resources without compromising their performance of resources. The proposed algorithm, based on heuristics, performs instantiation/shut-down of the virtual machines (VMs) in virtual clusters according variation in demand for resources of applications of type Bag-of-Tasks, BoT. The algorithm has been specified, verified and validated using Petri Nets formalism. The selected metrics to evaluate the proposal performance in three different scenarios are the total amount of machine started, amount of idle machines reused, total time of execution the application and average number of clusters started. The results showed that the adaptation policy proposal is able to reduce idle and the overhead of a virtual cluster and thus improve power consumption. Tipo: Dissertação

2012-01-01T00:00:00Z Araruna, Arthur Rodrigues http://repositorio.ufc.br/handle/riufc/13307 2019-01-03T16:14:32Z 2013-01-01T00:00:00Z

Título: Caminho mínimo com restrição probabilística de atraso máximo Autor(es): Araruna, Arthur Rodrigues Abstract: In the Probabilistic Delay Constrained Shortest Path problem we aim to consider the time factor in the design of cargo routing paths in road networks at minimum cost, considering the increasing uncertainty in travel times of these routes in real networks, and keeping in mind strategies of quality of service, in order to obtain a compromise between the travel costs and the compliance of the arrival time at the destination. We conducted a study of related problems in the literature of transport networks optimization, in order to better understand the problem to be addressed, about which we are not aware of existing works. We developed a scheme for enumerating partitions of the solution space of this problem, which uses an L decomposition to select these partitions wisely, and is aided by solutions to relaxations of the problem to obtain bounds for the optimal cost. In addition, we developed some branching and pruning strategies for a Branch-and-Bound scheme, with a pre-processing phase, in order to try and solve the problem directly. The computational results show that we are competitive with the commercial tool used for comparison in the smaller instances. For the remaining instances, this tool is more efficient in the time required for solving the problem. Tipo: Dissertação

2013-01-01T00:00:00Z