| Grant number: | 12/04260-4 |
| Support Opportunities: | Regular Research Grants |
| Start date: | September 01, 2012 |
| End date: | August 31, 2014 |
| Field of knowledge: | Physical Sciences and Mathematics - Computer Science - Computing Methodologies and Techniques |
| Principal Investigator: | Celso Massaki Hirata |
| Grantee: | Celso Massaki Hirata |
| Host Institution: | Divisão de Ciência da Computação (IEC). Instituto Tecnológico de Aeronáutica (ITA). Ministério da Defesa (Brasil). São José dos Campos , SP, Brazil |
| Associated researchers: | Joubert de Castro Lima |
Abstract
This project proposal includes two sub-projects: I-Cubing and CoMultiTouch. For the development of OLAP services, the reduction of the consumption of memory of data cube, as well as the processing time to its computation, update, and query is of essential. Besides the problem of how to generate all or part of the summarizations hierarchically, there exists the problem of how to maintain the data cube update for a certain time interval. Without this update, any approach for data cube is incomplete. The problem worsens when the measures are holistic. The computed data cubes can be skewed, i.e., with attributes not uniformly distributed, with high cardinality, high dimensionality, high number of tuples, and with multiple holistic measures. Many approaches were proposed and, so far, all of them suffer from the restrictions that prevent their generalization in some way.For I-Cubing, we propose a new approach to computing, representation, query, and update of complete or partial data cube, using external memory named I-Cubing (inverted cubing). It is based on the idea of inverted indexes. The adoption of inverted indexes makes possible the computation of cube with holistic measures. The preliminary results show that the I-Cubing approach has good performance and relatively low consumption of memory, and it is the only approach capable of compute, update, and query massive data cube. However, we have to emphasize that the results are indicative only and a more complete study is required. To undertake the study a higher performance computer system is required, which is the object of the request of this sub-project.Devices with multi-touch interface have been increasingly employed because they provide easy interaction. The development of mobile collaborative applications requires a design that presents significant challenges for re-use of existing mobile applications that use devices with multi-touch interface to address collaboration requirements. In CoMultiTouch, the objective is to develop a technique that allows semi-automatic extension of non-collaborative applications with multi-touch interface to support synchronous collaboration over the Internet. This technique will allow extending single user applications with a multi-touch interface aiming to satisfy the requirements of collaboration. (AU)
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