| 1. |
- Binotto, Alécio P. D., et al.
(author)
-
Dynamic Self-Rescheduling of Tasks over a Heterogeneous Platform
- 2008
-
In: Proceedings of the 2008 International Conference on Reconfigurable Computing and FPGAs. - Los Alamitos, Calif. : IEEE Computer Society. - 9780769534749 ; , s. 253-258
-
Conference paper (peer-reviewed)abstract
- Modern applications require powerful high-performance platforms to deal with many different algorithms that make use of massive calculations. At the same time, low-cost and high-performance specific hardware (e.g., GPU, PPU) are rising and the CPUs turned to multiple cores, characterizing together an interesting and powerful heterogeneous execution platform. Therefore, self-adaptive computing is a potential paradigm for those scenarios as it can provide flexibility to explore the computational resources on heterogeneous cluster attached to a high-performance computer system platform. As the first step towards a run-time reschedule load-balancing framework targeting that kind of platform, application time requirements and its crosscutting behavior play an important role for task allocation decisions. This paper presents a strategy for self-reallocation of specific tasks, including dynamic created ones, using aspect-oriented paradigms to address non-functional application timing constraints in the design phase. Additionally, as a case study, a special attention on Radar Image Processing will be given in the context of a surveillance system based on Unmanned Aerial Vehicles (UAV).
|
|
| 2. |
- Binotto, A.P.D., et al.
(author)
-
Real-time task reconfiguration support applied to an UAV-based surveillance system
- 2008
-
In: 2008 International Multiconference on Computer Science and Information Technology (Imcsit). - Piscataway, N.J. : IEEE Press. - 9788360810149 ; , s. 581-588
-
Conference paper (peer-reviewed)abstract
- Modern surveillance systems, such as those based on the use of Unmanned Aerial Vehicles, require powerful high- performance platforms to deal with many different algorithms that make use of massive calculations. At the same time, low- cost and high-performance specific hardware (e.g., GPU, PPU) are rising and the CPUs turned to multiple cores, characteriz- ing together an interesting and powerful heterogeneous execu- tion platform. Therefore, reconfigurable computing is a poten- tial paradigm for those scenarios as it can provide flexibility to explore the computational resources on heterogeneous cluster attached to a high-performance computer system platform. As the first step towards a run-time reconfigurable workload bal- ancing framework targeting that kind of platform, application time requirements and its crosscutting behavior play an impor- tant role for task allocation decisions. This paper presents a strategy to reallocate specific tasks in a surveillance system composed by a fleet of Unmanned Aerial Vehicles using aspect- oriented paradigms in order to address non-functional applica- tion timing constraints in the design phase. An aspect support from a framework called DERAF is used to support reconfigu- ration requirements and provide the resource information needed by the reconfigurable load-balancing strategy. Finally, for the case study, a special attention on Radar Image Process- ing will be given.
|
|
| 3. |
- Lidström, Kristoffer, et al.
(author)
-
Model-based estimation of driver intentions using particle filtering
- 2008
-
In: 11th International IEEE Conference on Intelligent Transportation Systems, 2008. ITSC 2008. - Piscataway, NJ. : IEEE Press. - 9781424421114 ; , s. 1177-1182
-
Conference paper (peer-reviewed)abstract
- Proactive vehicle alert systems that warn the driver about dangerous situations must be able to reason about, and predict, likely future states of the traffic environment. Our prediction method is based on a combination of a fuzzy logic model for intersection turning behavior and Gipps model for car following behavior. The stochastic models are used together with a particle filter to recursively approximate the state probability distribution as measurements are received over time. Estimates of the unobservable part of the state are used to predict path choice and thus driver intentions. The approach is evaluated on trajectory data gathered from video footage of an intersection, however it is also relevant for trajectories acquired through vehicle-to-vehicle communication.
|
|
| 4. |
- Pignaton de Freitas, Edison, et al.
(author)
-
Adaptable middleware for heterogeneous wireless sensor networks
- 2008
-
In: Proceedings of the 10th European Agent Systems Summer School. ; , s. 17-24
-
Conference paper (other academic/artistic)abstract
- The use of sensor networks in different kinds of sophisticated applications is emerging due to several advances in sensor technologies and embedded systems. However, the integration and coordination of heterogeneous sensors is still a challenge, especially when the target application environment is susceptible to changes that the system must track and adapt itself to in order to fulfil the users’ requirements. These changing scenarios require services being provided in different places during the system runtime, and to fulfil this, a support for adaptability is needed. In this paper we present some initial ideas to use multi-agents in a middleware that aims to provide the necessary support to sophisticated sensor network applications.
|
|
| 5. |
- Pignaton de Freitas, Edison, et al.
(author)
-
Dynamic Reconfigurable Task Schedule Support towards a Reflective Middleware for Sensor Network
- 2008
-
In: Proceedings of the 2008 International Symposium on Parallel and Distributed Processing with Applications. - Los Alamitos, Calif. : IEEE Computer Society. - 9780769534718 ; , s. 886-891
-
Conference paper (peer-reviewed)abstract
- Sensor networks are being applied in several emerging sophisticated applications due to the use of powerful and high-quality sensor nodes, such as radars and visible light cameras. However, these nodes need additional features to optimally benefit from heterogeneous modern computing platforms. Therefore, reconfigurable computing is a potential paradigm for those scenarios as it can provide flexibility to explore the computational resources on that kind of high performance computing system. This paper presents a reconfigurable sensor node allocation support, based on application requirements, provided by a middleware focused on heterogeneous sensor networks. In order to address this concern, an aspect-orientation paradigm and intelligent agents approach is proposed followed by an UAV case study.
|
|
| 6. |
- Pignaton de Freitas, Edison, et al.
(author)
-
Dynamic Tasks' Reconfiguration for UAV System using Aspect Orientation
- 2008
-
In: International Symposium on Parallel and Distributed Processing with Applications, 2008. ISPA '08. - Piscataway, N.J. : IEEE Press. - 9780769534718 ; , s. 292-300
-
Conference paper (peer-reviewed)abstract
- Many modern applications require high-performance platforms to deal with a variety of algorithms requiring massive calculations. Moreover, low-cost powerful hardware (e.g., GPU, PPU) and CPUs with multiple cores have become abundant, and can be combined in heterogeneous architectures. To cope with this, reconfigurable computing is a potential paradigm as it can provide flexibility to explore the computational resources on hybrid and multi-core desktop architectures. The workload can optimally be (re)distributed over heterogeneous cores along the lifecycle of an application, aiming for best performance. As the first step towards a run-time reconfigurable load-balancing framework, application requirements and crosscutting concerns related to timing play an important role for task allocation decisions. In this paper, we present the use of aspect-oriented paradigms to address non-functional application timing constraints in the design phase. The DERAF aspects’ framework is extended to support reconfiguration requirements; and a strategy for load-balancing is described. In addition, we present preliminary evaluation using an Unmanned Aerial Vehicle (UAV) based Surveillance System as case study.
|
|
| 7. |
- Pignaton de Freitas, Edison, et al.
(author)
-
Real-time Support in Adaptable Middleware for Heterogeneous Sensor Networks
- 2008
-
In: 2008 International Multiconference on Computer Science and Information Technology. - Piscataway, NJ : IEEE Press. - 9788360810149 ; , s. 593-600
-
Conference paper (peer-reviewed)abstract
- The use of sensor networks in different kinds of sophisticated applications is emerging due to several advances in sensor/embedded system technologies. However, the integration and coordination of heterogeneous sensors is still a challenge, especially when the target application environment is susceptible to changes. Such systems must adapt themselves in order to fulfil increasing requirements. Especially the handling of real-time requirements is a challenge in this context in which different technologies are applied to build the overall system. Moreover, these changing scenarios require services located at different places during the system runtime. Thus a support for adaptability is needed. Timing and precision requirements play an important role in such scenarios. Besides, QoS management must provide the necessary support to offer the flexibility demanded in such scenarios. In this paper we present the real-time perspective of a middleware that aims at providing the support required by sophisticated heterogeneous sensor network applications. We propose to address the real-time concerns by using the OMG Data Distribution Service for Real-time Systems approach, but with a more flexible approach that fits in the heterogeneous environment in which the proposed middleware is intended to be used. We also present a coordination protocol to support the proposed approach.
|
|
| 8. |
- Pignaton de Freitas, Edison, et al.
(author)
-
Reflective middleware for heterogeneous sensor networks
- 2008
-
In: Proceedings of the 7th workshop on Reflective and adaptive middleware. - New York, NY : Association for Computing Machinery (ACM). - 9781605583679 ; , s. 49-50
-
Conference paper (peer-reviewed)abstract
- The use of sensor networks in sophisticated applications is emerging as a new trend. However, the integration and coordination of heterogeneous sensors is still a challenge, especially when the target application scenario is susceptible to constant changes. Such systems must adapt themselves in order to fulfill requirements that can also change during the system runtime. Moreover, the changes that occur in such scenarios require services located at different places during the system runtime. Due to the dynamicity of this context, system adaptations must take place very quickly, requiring that decisions for adaptation are taken autonomously by the system without waiting for human operator's directions. Thus a reflective behavior must be provided. This paper presents a reflective middleware that supports reflective behaviors to address adaptation needs of heterogeneous sensor networks deployed in dynamic scenarios. This middleware presents specific handling of concerns related to real-time, service adaptation and resource allocation through network reasoning. These concerns are addressed mainly by the use of mobile and multi-agents, and aspect-oriented concepts. The use of multi-agents represents the spreading of intelligence over the network, while the mobile-agents provide service adaptation by code mobility. In the same direction, aspects address behavioral adaptations related to crosscutting concerns.
|
|
| 9. |
- Pignaton de Freitas, Edison, et al.
(author)
-
Using aspects and component concepts to improve reuse of software for embedded systems product lines
- 2008
-
In: Proceedings of the Early aspects workshop at SPLC 2008.
-
Conference paper (peer-reviewed)abstract
- Embedded systems have several characteristics, such as application specific needs, real-time constraints and intrinsic embedded concerns (i.e. energy consumption), which hinder the reuse of previously developed components as well as their adaptation to provide variability in a software product line. As more applications require embedded system solutions, it is clear that if each time a new application is developed, it is not suitable to develop its supporting embedded system components from scratch. Resulting in an inability of the industry to follow the needs imposed by the market. To cope with this problem, the reuse of components within software product lines is a key issue. It seams to be easy task, but in fact it is not, due to increasing amount functionalities and crosscutting concerns present in those applications. In this paper we present an approach to handle components at a higher abstraction level, whose handling of crosscutting concerns is weaved by system level aspects, in order to address such complexity and also to make it easier the handling of variations in a software product line.
|
|
