Proceedings of the 13th International Conference on Information Integration and Web-based Applications and Services, 2011
In the last few years, web-based environments have witnessed the emergence of new types of on-dem... more In the last few years, web-based environments have witnessed the emergence of new types of on-demand business analysis that facilitate complex and integrated analytical information from multidimensional databases. In these on-demand environments, users of business intelligence architectures can have very different reporting and analytical needs, requiring much greater flexibility and adaptability of today's multidimensional data modeling. While structured data models for OLAP have been studied in detail, a majority of current approaches has not put its focus on the dynamic aspect of the multidimensional design and/or semantic enriched impact model. Within the scope of this paper, we present a flexible approach to model multidimensional databases in the context of dynamic web-based analysis and adaptive users' requirements. The introduced formal approach is based on hypergraphs with the ability to provide formal constructs specifying the different types of multidimensional elements and relationships which enable the support of highly customized business analysis. The introduced hypergraphs are used to formally define the semantics of multidimensional models with unstructured ad-hoc analytic activities. The proposed model also supports a formal representation of advanced concepts like dynamic hierarchies, many-to-many associations, additivity constraints etc. Some scenario example are also provided to motivate and illustrate the proposed approach.
2006 Fortieth Asilomar Conference on Signals, Systems and Computers, 2006
AbstractThe problem of designing a good MAC protocol for MIMO-OFDM ad hoc networks is considered... more AbstractThe problem of designing a good MAC protocol for MIMO-OFDM ad hoc networks is considered in this paper. The proposed protocol reserves a portion of the carriers for the control channel. We call this the Directional Multiple Access with Collision Avoidance (DMACA) ...
2006 40th Annual Conference on Information Sciences and Systems, 2006
We investigate the problem of minimizing total transmit power in an ad hoc network while maintain... more We investigate the problem of minimizing total transmit power in an ad hoc network while maintaining quality of service for each link in the network. It is assumed that each node in the network uses M transmit and M receive antennas. We introduce two new algorithms based on minimizing the total interference function (TIF). A cooperative algorithm is also introduced
ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was e... more ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
A 480‐output TFT‐LCD source driver IC for a COG (Chip On Glass) application is presented. To redu... more A 480‐output TFT‐LCD source driver IC for a COG (Chip On Glass) application is presented. To reduce the cost of the TFT‐LCD module, COG technology is being adopted for the portable display devices. To achieve the high data rate transfer on the COG‐type TFT‐LCD module, an ACDS (Advanced Current‐mode Differential Signaling) interface is proposed. The offset compensating algorithm is adopted to alleviate the block dim phenomenon due to the offset of internal gamma buffers. The driver IC was fabricated in 0.35um high voltage CMOS technology process and evaluated with 13.3‐inch diagonal wide XGA (1280RGB×800) TFT‐LCD module of which cost was reduced significantly.
The breakup of droplets due to creeping motion in a confined microchannel geometry is studied usi... more The breakup of droplets due to creeping motion in a confined microchannel geometry is studied using three-dimensional numerical simulations. Analogously to unconfined droplets, there exist two distinct breakup phases: (i) a quasi-steady droplet deformation driven by the externally applied flow; and (ii) a surface-tension-driven three-dimensional rapid pinching that is independent of the externally applied flow. In the first phase, the droplet relaxes back to its original shape if the externally applied flow stops; if the second phase is reached, the droplet will always break. Also analogously to unconfined droplets, there exist two distinct critical conditions: (i) one that determines whether the droplet reaches the second phase and breaks, or it reaches a steady shape and does not break; and (ii) one that determines when the rapid autonomous pinching starts. We analyse the second phase using stop–flow simulations, which reveal that the mechanism responsible for the autonomous break...
Proceedings of the 13th International Conference on Information Integration and Web-based Applications and Services, 2011
In the last few years, web-based environments have witnessed the emergence of new types of on-dem... more In the last few years, web-based environments have witnessed the emergence of new types of on-demand business analysis that facilitate complex and integrated analytical information from multidimensional databases. In these on-demand environments, users of business intelligence architectures can have very different reporting and analytical needs, requiring much greater flexibility and adaptability of today's multidimensional data modeling. While structured data models for OLAP have been studied in detail, a majority of current approaches has not put its focus on the dynamic aspect of the multidimensional design and/or semantic enriched impact model. Within the scope of this paper, we present a flexible approach to model multidimensional databases in the context of dynamic web-based analysis and adaptive users' requirements. The introduced formal approach is based on hypergraphs with the ability to provide formal constructs specifying the different types of multidimensional elements and relationships which enable the support of highly customized business analysis. The introduced hypergraphs are used to formally define the semantics of multidimensional models with unstructured ad-hoc analytic activities. The proposed model also supports a formal representation of advanced concepts like dynamic hierarchies, many-to-many associations, additivity constraints etc. Some scenario example are also provided to motivate and illustrate the proposed approach.
2006 Fortieth Asilomar Conference on Signals, Systems and Computers, 2006
AbstractThe problem of designing a good MAC protocol for MIMO-OFDM ad hoc networks is considered... more AbstractThe problem of designing a good MAC protocol for MIMO-OFDM ad hoc networks is considered in this paper. The proposed protocol reserves a portion of the carriers for the control channel. We call this the Directional Multiple Access with Collision Avoidance (DMACA) ...
2006 40th Annual Conference on Information Sciences and Systems, 2006
We investigate the problem of minimizing total transmit power in an ad hoc network while maintain... more We investigate the problem of minimizing total transmit power in an ad hoc network while maintaining quality of service for each link in the network. It is assumed that each node in the network uses M transmit and M receive antennas. We introduce two new algorithms based on minimizing the total interference function (TIF). A cooperative algorithm is also introduced
ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was e... more ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
A 480‐output TFT‐LCD source driver IC for a COG (Chip On Glass) application is presented. To redu... more A 480‐output TFT‐LCD source driver IC for a COG (Chip On Glass) application is presented. To reduce the cost of the TFT‐LCD module, COG technology is being adopted for the portable display devices. To achieve the high data rate transfer on the COG‐type TFT‐LCD module, an ACDS (Advanced Current‐mode Differential Signaling) interface is proposed. The offset compensating algorithm is adopted to alleviate the block dim phenomenon due to the offset of internal gamma buffers. The driver IC was fabricated in 0.35um high voltage CMOS technology process and evaluated with 13.3‐inch diagonal wide XGA (1280RGB×800) TFT‐LCD module of which cost was reduced significantly.
The breakup of droplets due to creeping motion in a confined microchannel geometry is studied usi... more The breakup of droplets due to creeping motion in a confined microchannel geometry is studied using three-dimensional numerical simulations. Analogously to unconfined droplets, there exist two distinct breakup phases: (i) a quasi-steady droplet deformation driven by the externally applied flow; and (ii) a surface-tension-driven three-dimensional rapid pinching that is independent of the externally applied flow. In the first phase, the droplet relaxes back to its original shape if the externally applied flow stops; if the second phase is reached, the droplet will always break. Also analogously to unconfined droplets, there exist two distinct critical conditions: (i) one that determines whether the droplet reaches the second phase and breaks, or it reaches a steady shape and does not break; and (ii) one that determines when the rapid autonomous pinching starts. We analyse the second phase using stop–flow simulations, which reveal that the mechanism responsible for the autonomous break...
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