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| 2. |
- Bihary, Dóra, et al.
(författare)
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Simulation of communication and cooperation in multispecies bacterial communities with an agent based model
- 2012
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Ingår i: Scalable computing. - 1895-1767. ; 13:1, s. 21-28
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Tidskriftsartikel (refereegranskat)abstract
- Members of bacterial communities communicate and cooperate via diffusible chemical materials they emit into the environment, and at the same time, they also compete for nutrients and space. Agent-based models (ABMs) are useful tools for simulating the growth of communities containing multiple interacting microbial species. In this work we present numerical indices characterizing spatial distribution and the fitness of competing bacterial species in an ABM and we present data on how these indices can be used to visually summarize large scale simulation experiments. Preliminary results show bacterial agents utilizing different nutrients but sharing communication signals and public goods can form stable mixed communities in which the species grow faster than any of the single species alone.
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| 3. |
- Binotto, Alécio P. D., et al.
(författare)
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Towards task dynamic reconfiguration over asymmetric computing platforms for UAVs surveillance systems
- 2009
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Ingår i: Scalable computing. - Timisoara : Universitatea de Vest din Timisoara / West University of Timisoara. - 1895-1767. ; 10:3, s. 277-289
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Tidskriftsartikel (refereegranskat)abstract
- High-performance platforms are required by modern applications that make use of massive calculations. Actually, low-cost and high-performance specific hardware (e.g. GPU) can be a good alternative along with CPUs, which turned to multiple cores, forming powerful heterogeneous desktop execution platforms. Therefore, self-adaptive computing is a promising paradigm as it can provide flexibility to explore different computing resources, on which heterogeneous cluster can be created to improve performance on different execution scenarios. One approach is to explore run-time tasks migration among node's hardware towards an optimal system load-balancing aiming at performance gains. This way, time requirements and its crosscutting behavior play an important role for task (re)allocation decisions. This paper presents a self-rescheduling task strategy that makes use of aspect-oriented paradigms to address non-functional application timing constraints from earlier design phases. A case study exploring Radar Image Processing tasks is presented to demonstrate the proposed approach. Simulations results for this case study are provided in the context of a surveillance system based on Unmanned Aerial Vehicles (UAVs). © 2009 SCPE.
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| 4. |
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| 5. |
- Carlsson, Bengt, et al.
(författare)
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The success of cooperative strategies in the iterated prisoner's dilemma and the chicken game
- 2007
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Ingår i: Scalable Computing: Practice and Experience: Scientific International Journal for Parallel and Distributed Computing. - 1895-1767. ; 8:1, s. 87-100
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Tidskriftsartikel (refereegranskat)abstract
- The prisoner's dilemma has evolved into a standard game for analyzing the success of cooperative strategies in repeated games. With the aim of investigating the behavior of strategies in some alternative games we analyzed the outcome of iterated games for both the prisoner's dilemma and the chicken game. In the chicken game, mutual defection is punished more strongly than in the prisoner's dilemma, and yields the lowest fitness. We also ran our analyses under different levels of noise. The results reveal a striking difference in the outcome between the games. Iterated chicken game needed more generations to find a winning strategy. It also favored nice, forgiving strategies able to forgive a defection from an opponent. In particular the well-known strategy tit-for-tat has a poor successrate under noisy conditions. The chicken game conditions may be relatively common in other sciences, and therefore we suggest that this game should receive more interest as a cooperative game from researchers within computer science.
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| 6. |
- Carlsson, Bengt, et al.
(författare)
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The success of cooperative strategies in the iterated prisoner's dilemma and the chicken game
- 2007
-
Ingår i: Scalable Computing: Practice and Experience: Scientific International Journal for Parallel and Distributed Computing. - 1895-1767. ; 8:1, s. 87-100
-
Tidskriftsartikel (refereegranskat)abstract
- The prisoner's dilemma has evolved into a standard game for analyzing the success of cooperative strategies in repeated games. With the aim of investigating the behavior of strategies in some alternative games we analyzed the outcome of iterated games for both the prisoner's dilemma and the chicken game. In the chicken game, mutual defection is punished more strongly than in the prisoner's dilemma, and yields the lowest fitness. We also ran our analyses under different levels of noise. The results reveal a striking difference in the outcome between the games. Iterated chicken game needed more generations to find a winning strategy. It also favored nice, forgiving strategies able to forgive a defection from an opponent. In particular the well-known strategy tit-for-tat has a poor successrate under noisy conditions. The chicken game conditions may be relatively common in other sciences, and therefore we suggest that this game should receive more interest as a cooperative game from researchers within computer science.
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| 7. |
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| 8. |
- Nikander, P., et al.
(författare)
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ELL-I : An inexpensive platform for fixed things
- 2013
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Ingår i: Scalable computing. - : Scalable Computing: Practice and Experience. - 1895-1767. ; 14:3, s. 155-167
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Tidskriftsartikel (refereegranskat)abstract
- The Internet of Things (IoT) vision is enticing; each and every "thing" in the world is expected to be eventually connected to the Internet, thereby becoming a part of the "context" within which the applications live. In most of the IoT research, the focus has been in enabling movable things to communicate, including phones, tablets, RFID tags, watches, and jewellery, to name but a few. In such an approach, the things are expected to have their own batteries or receive temporary power over short distance electro-magnetic field. This approach has also dominated the more fixed side of the IoT research, including a large fraction on the work on stationary sensors and actuators, focusing also there on battery-based operations and wireless communication. In this paper, we introduce an alternative view to the world of stationary Internet-connected things. We argue that a large majority of the fixed or stationary things would benefit from being permanently powered using wireline connections, and while doing so, it becomes natural to use the same wires also for their communication and contextual needs. Such an approach allows the appliances to become part of the the wider application context. With this in mind, we introduce the ELL-i platform, a new open source initiative for provide a low-cost flexible prototyping and production platform for extensible, Power-over-Ethernet based smart appliances. We describe the first ELL-i prototyping board, a number of application concepts, and discuss its business model.
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| 9. |
- Pllana, Sabri, et al.
(författare)
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Automatic Performance Model Transformation from a Human-intuitive to a Machine-efficient Form
- 2009
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Ingår i: Scalable computing. - : SCPE. - 1895-1767. ; 10:1, s. 35-47
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Tidskriftsartikel (refereegranskat)abstract
- We address the issue of the development of performance models for programs that may be executed on large-scale computing systems. The commonly used approaches apply non-standard notations for model specification and often require that the software engineer has a thorough understanding of the underlying performance modeling technique. We propose to bridge the gap between the performance modeling and software engineering by incorporating UML. In our approach we aim to permit the graphical specification of performance model in a human-intuitive fashion on one hand, but on the other hand we aim for a machine-efficient model evaluation. The user specifies graphically the performance model using UML. Thereafter, the transformation of the performance model from the human-usable UML representation to the machine-efficient C++ representation is done automatically. We describe our methodology and illustrate it with the automatic transformation of a sample performance model. Furthermore, we demonstrate the usefulness of our approach by modeling and simulating a real-world material science program.
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| 10. |
- Steghöfer, Jan-Philipp, 1983, et al.
(författare)
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Combining PosoMAS Method Content with Scrum: Agile Software Engineering for Open Self-Organising Systems
- 2015
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Ingår i: Scalable Computing: Practice and Experience. - : Scalable Computing: Practice and Experience. - 1895-1767. ; 16:4, s. 333-354
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Tidskriftsartikel (refereegranskat)abstract
- In this paper we discuss how to combine the method content from PosoMAS, the Process for open, self-organising Multi-Agent Systems, with the agile iterative-incremental life cycle of Scrum. The result is an agile software engineering methodology tailored to open self-organising systems. We show how the methodology has been applied in a development project and discuss the lessons learned. Finally, we compare the Scrum version of PosoMAS to other agile agent-oriented software engineering methodologies and address the selection of a suitable process.
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