http://hdl.handle.net/2117/3974 2013-05-23T16:19:59Z http://hdl.handle.net/2117/19370 Title: Empowering automatic data-center management with machine learning Authors: Berral García, Josep Lluís; Gavaldà Mestre, Ricard; Torres Viñals, Jordi Abstract: The Cloud as computing paradigm has become nowadays crucial for most Internet business models. Managing and optimizing its performance on a moment-by-moment basis is not easy given as the amount and diversity of elements involved (hardware, applications, workloads, customer needs...). Here we show how a combination of scheduling algorithms and data mining techniques helps improving the performance and profitability of a data-center running virtualized web-services. We model the data-center's main resources (CPU, memory, IO), quality of service (viewed as response time), and workloads (incoming streams of requests) from past executions. We show how these models to help scheduling algorithms make better decisions about job and resource allocation, aiming for a balance between throughput, quality of service, and power consumption. 2013-05-22T11:19:56Z http://hdl.handle.net/2117/19369 Title: Towards an implementation of a social electronic reminder for pills Authors: Gómez Sebastià, Ignasi; Garcia Gasulla, Dario; Álvarez Napagao, Sergio; Vázquez Salceda, Javier; Cortés García, Claudio Ulises Abstract: Non-compliance with prescribed medication is a major problem for elder people living alone in developed countries. Forgetfulness and confusion can lead to it, specially when multiple pathologies require a cocktail of diff erent medications each delivered at different time intervals during di fferent periods of time. Assistive technologies, a recent application area for a wide range of Arti cial Intelligence techniques and tools, have been e ectively used for supporting people in their daily activities. This paper introduces the design and implementation of a system for assisting elder people on following the treatment prescribed by a professional, with the novelty of being based in social and organisational aware assistive technology. 2013-05-22T09:00:23Z http://hdl.handle.net/2117/19368 Title: Full high-dynamic range images for dynamic scenes Authors: Ramírez Orozco, Raissel; Martín, Ignacio; Loscos, Céline; Vázquez Alcocer, Pere Pau Abstract: The limited dynamic range of digital images can be extended by composing photographs of the same scene taken with the same camera at the same view point at di erent exposure times. This is a standard procedure for static scenes but a challenging task for dynamic ones. Several methods have been presented but few recover high dynamic range within moving areas. We present a method to recover full high dynamic range (HDR) images from dynamic scenes, even in moving regions. Our method has 3 steps. Firstly, areas a ected by motion are detected to generate a ghost mask. Secondly, we register dynamic objects over a reference image (the best exposed image in the input sequence). Thirdly, we combine the registered input photographs to recover HDR values in a whole image using a weighted average function. Once matching is found, the assembling step guarantees that all aligned pixels will contribute to the nal result, including dynamic content. Tests were made on more than 20 sets of sequences, with moving cars or pedestrians and di erent background. Our results show that Image Mapping Function approach detects best motion regions while Normalized Cross Correlation o ers the best deal speed-accuracy for image registration. Results from our method o ers better result when moving object are roughly rigid and their movement is mostly rigid. The nal composition is an HDR image with no ghosting and all dynamic content present in HDR values. 2013-05-22T08:40:29Z http://hdl.handle.net/2117/19310 Title: Cloud virtual machine scheduling: modelling the cloud virtual machine instantiation Authors: Sotiriadis, S.; Bessis, N.; Xhafa Xhafa, Fatos; Antonopoulos, Nicos 2013-05-16T13:55:24Z http://hdl.handle.net/2117/19306 Title: Performance analysis of DSR and DYMO routing protocols for VANETs Authors: Spaho, Evjola; Ikeda, Makoto; Barolli, Leonard; Xhafa Xhafa, Fatos; Kolici, Vladi; Takizawa, Makoto 2013-05-16T13:36:45Z http://hdl.handle.net/2117/19304 Title: Performance evaluation of WMN-GA system for low densities of clients and different settings of population size Authors: Oda, Tetsuya; Barolli, Admir; Spaho, Evjola; Barolli, Leonard; Xhafa Xhafa, Fatos; Takizawa, Makoto 2013-05-16T13:22:36Z http://hdl.handle.net/2117/19301 Title: Multimedia transmissions over a MANET testbed: problems and issues Authors: Kulla, E.; Ikeda, Makoto; Oda, Tetsuya; Barolli, Leonard; Xhafa Xhafa, Fatos; Takizawa, Makoto 2013-05-16T13:12:58Z http://hdl.handle.net/2117/19300 Title: Data replication and synchronization in P2P collaborative systems Authors: Xhafa Xhafa, Fatos 2013-05-16T13:04:29Z http://hdl.handle.net/2117/19264 Title: A comparison study between two fuzzy-based trustworthiness systems for P2P networks Authors: Umezaki, K.; Spaho, Evjola; Barolli, Leonard; Xhafa Xhafa, Fatos; Matsuo, Keita; Iwashige, J. 2013-05-15T15:47:19Z http://hdl.handle.net/2117/19263 Title: Tuning of operators in memetic algorithms for independent batch scheduling in computational grids Authors: Xhafa Xhafa, Fatos; Duran, B.; Barolli, Leonard; Kolici, Vladi; Miho, Rozeta; Takizawa, Makoto 2013-05-15T15:34:03Z http://hdl.handle.net/2117/19260 Title: Mission operations scheduling: complexity and resolution methods Authors: Xhafa Xhafa, Fatos; Sun, Junzi; Barolli, Admir; Takizawa, Makoto 2013-05-15T15:05:24Z http://hdl.handle.net/2117/19259 Title: A fuzzy-based cluster-head selection system for WSNs: a comparison study for static and mobile sensors Authors: Barolli, Leonard; Wang, Qi; Kulla, E.; Xhafa Xhafa, Fatos; Kamo, B.; Takizawa, Makoto 2013-05-15T14:48:08Z http://hdl.handle.net/2117/19258 Title: Performance evaluation of WMN-GA system for dense networks considering different distributions Authors: Barolli, Admir; Oda, Tetsuya; Barolli, Leonard; Xhafa Xhafa, Fatos; Takizawa, Makoto; Uchida, K. 2013-05-15T14:28:58Z http://hdl.handle.net/2117/19256 Title: Socially-aware emergent narrative Authors: Álvarez Napagao, Sergio; Gómez Sebastià, Ignasi; Panagiotidi, Sofia; Tejeda Gómez, José Arturo; Oliva Felipe, Luis Javier; Vázquez Salceda, Javier Abstract: In agent research, emergent narrative aims for practical solutions to the narrative paradox problem in both drama and interactive scenarios. At the same time, organisational frameworks can be used in games to provide flexibility, adaptiveness, or social-awareness. In this paper, we propose an extension of our cOncienS framework to support emergent narrative in games with two objectives: 1) provide social-awareness in emergent narrative by means of an organisational model, and 2) create convincing dynamic and flexible storytelling in games. 2013-05-15T14:10:46Z http://hdl.handle.net/2117/19252 Title: The HOM problem is EXPTIME-complete Authors: Creus López, Carles; Gascón Caro, Adrià; Godoy Balil, Guillem; Ramos, Lander Abstract: The HOM problem questions whether the image of a given regular tree language through a given tree homomorphism is also regular. Decidability of HOM is an important theoretical question which was open for a long time. Recently, HOM has been proved decidable with a triple exponential time algorithm. In this paper we obtain an exponential time algorithm for this problem, and conclude that it is EXPTIME-complete. The proof builds upon previous results and techniques on tree automata with constraints. 2013-05-15T13:39:05Z