A Novel Multiobjective Cell Switch-Off Framework for Cellular Networks

Cell Switch-Off (CSO) is recognized as a promising approach to reduce the energy consumption in next-generation cellular networks. However, CSO poses serious challenges not only from the resource allocation perspective but also from the implementation point of view. Indeed, CSO represents a difficult optimization problem due to its NP-complete nature. Moreover, there are a number of important practical limitations in the implementation of CSO schemes, such as the need for minimizing the real-time complexity and the number of on-off/off-on transitions and CSO-induced handovers. This article introduces a novel approach to CSO based on multiobjective optimization that makes use of the statistical description of the service demand (known by operators). In addition, downlink and uplink coverage criteria are included and a comparative analysis between different models to characterize intercell interference is also presented to shed light on their impact on CSO. The framework distinguishes itself from other proposals in two ways: 1) The number of on-off/off-on transitions as well as handovers are minimized, and 2) the computationally-heavy part of the algorithm is executed offline, which makes its implementation feasible. The results show that the proposed scheme achieves substantial energy savings in small cell deployments where service demand is not uniformly distributed, without compromising the Quality-of-Service (QoS) or requiring heavy real-time processing

Relating free will beliefs and attitudes

D.W. was supported by the European Union's Horizon 2020 research and innovation programme under the Marie Sklodowska-Curie (MSCA) grant agreement no. 665501 and the Flemish Science Foundation (FWO) grant FWO.KAN.2019.0023.01. E.C. was supported by FWO grants FWO18/PDO/049 and 12U0322N. C.G.-G. was supported by MSCA grant no. 835767 and the Spanish Ministry of Science and Innovation grant IJC2019-040208-I. M.B. was supported by the Einstein Foundation Berlin (Einstein Strategic Professorship). ReferencesMost people believe in free will, which is foundational for our sense of agency and responsibility. Past research demonstrated that such beliefs are dynamic, and can be manipulated experimentally. Much less is known about free will attitudes (FWAs; do you value free will?), whether they are equally dynamic, and about their relation to free will beliefs (FWBs). If FWAs were strongly positive, people might be reluctant to revise their beliefs even in the face of strong evidence to do so. In this registered report, we developed a novel measure of FWAs and directly related FWBs and attitudes for the first time. We found FWBs and attitudes to be positively related, although to a lesser degree than determinism or dualism beliefs/attitudes. Nevertheless, an experimental manipulation technique aimed at reducing FWBs (Crick text) showed remarkably specific effects on FWBs only, and no effects on FWAs. Overall, these results provide valuable new insights into laypeople’s views on free will by including a novel measure of FWAs. They also provide evidence for the validity of a common experimental technique that has been rightfully criticized in the literature lately.European Union's Horizon 2020 research and innovation programme under the Marie Sklodowska-Curie (MSCA) 665501FWO FWO.KAN.2019.0023.01 FWO18/PDO/049 12U0322N MSCA 835767Spanish Government IJC2019-040208-IEinstein Foundation Berlin (Einstein Strategic Professorship

Teitos para selfis

Graña García, Armando and González Álvarez, David (2015): «Teitos para selfis». Atlántica XXII, 38: 56-59.N

Inclusión social de personas con discapacidad física a través de la natación de alto rendimiento

Es un hecho que las personas que tienen algún tipo de discapacidad, históricamente han sufrido algún tipo de marginación y exclusión social. Frente a esta tendencia, un gran número de autores defienden una sociedad para todos, es decir, una sociedad en la que todos formemos parte de ella, puesto que la inclusión lleva aparejada la aceptación de la diversidad (Forest & Pearpoint, 2010; O’Brien, Forest, Pearpoint, Snow, & Hasbury, 1989). La actividad física es, sin duda, una de las herramientas que permiten garantizar la inclusión social de las personas con discapacidad. Desde el Club Fidias de Córdoba se intenta apoyar y colaborar en el fomento, la promoción y la competición del deporte para discapacitados y en especial a través de las Actividades Acuáticas. Estas, además de tener un fin deportivo, se convierten en un instrumento de mejora de la calidad de vida, así como en un instrumento de inclusión social. El objetivo fundamental de este estudio ha consistido en valorar el deporte como estrategia de inclusión social y, más concretamente, en el campo de la natación adaptada para personas con discapacidad física. De su práctica se han derivado altos niveles de satisfacción por parte de sus practicantes y efectos positivos en la incorporación de los mismos a la vida social. El trabajo ha supuesto un análisis exhaustivo de dimensiones tales como ocio y tiempo libre, autonomía y satisfacción, apoyo del entorno familiar y social cercano, entrenadora y nivel de satisfacción, por medio de un estudio de tipo no experimental, descriptivo y correlacional

Frustration free gapless Hamiltonians for Matrix Product States

For every Matrix Product State (MPS) one can always construct a so-called parent Hamiltonian. This is a local, frustration free, Hamiltonian which has the MPS as ground state and is gapped. Whenever that parent Hamiltonian has a degenerate ground state (the so-called non-injective case), we construct another 'uncle' Hamiltonian which is local and frustration free but gapless, and its spectrum is $\R^+$. The construction is obtained by linearly perturbing the matrices building up the state in a random direction, and then taking the limit where the perturbation goes to zero. For MPS where the parent Hamiltonian has a unique ground state (the so-called injective case) we also build such uncle Hamiltonian with the same properties in the thermodynamic limit.Comment: 36 pages, new version with some contents rearranged, and a correction in the injective cas

Conservation Status of the Masked Bobwhite in Sonora, Mexico

The historical distribution of the endangered masked bobwhite (Colinus virginianus ridgwayi) ranged from southern Arizona, United States, to Central Sonora, Mexico. Research in Sonora the past 30 years focused on the largest known populations, near the town of Benjamin Hill on the El Carrizo ranch. Research and perceptions by local residents pointed to a decline in masked bobwhite over the past decade. We evaluated existence of the subspecies during 2013-15 by searching transects and interviewing local residents. Our evaluation yielded no validated observations of masked bobwhite, and subsequently we call for further coordinated population monitoring and the development of technology to identify vocalizations by the subspecies

Distribution and Socio-spatial Segregation of cruise ship workers in Cozumel, Mexico

The cruise industry is one of the most profitable businesses in the world having a constant growth since the 1980’s. However, it is important to mention that this success has been reached in part due to the workforce in the vessels, better known as cruise ship crew members.As well as any other type of tourism, visitors have several effects on ports of call when vessels berth in ports of call. But even when there is knowledge on the effects of cruise tourism in the destinations (mainly caused by tourists), there is a scarcity of literature in terms of issues related to the cruise ship staff on land.In addition to the above, information about the activities and behaviour of the cruise workers, the knowledge of their specific distribution and socio-spatial segregation according to their hierarchies and nationalities during their free time in ports of call is practically null.Therefore, the aim of this research work is to point out the distribution of cruise ship workers in order to demonstrate their segregation in the Island of Cozumel, Mexico, according to the nation they come from and their position at work.Findings demonstrate that there are 79 different sites visited by crew members in Cozumel Island. It has also been identified that their distribution and socio-spatial segregation on the island is related to their hierarchies at work and nationalities, which could lead to a remarkable socioeconomic influence during their free time in the destination.

Attacking a public key cryptosystem based on tree replacement

We point out several security flaws in the cryptosystem based on tree replacement systems proposed by Samuel, Thomas, Abisha and Subramanian at INDOCRYPT 2002. Due to the success of (among others) very simple ciphertext-only attacks, we evidence that this system does not, in its present form, offer acceptable security guarantees for cryptographic applications.Work partially supported by projects BFM2001-3239-C03-01 and BFM2001-1284

Clasificación de suelos en pastos alpinos de Aísa y Ordesa (Pirineo Central)

11 páginas, 1 figura, 5 tablas.[EN]: The soils of five grassland communities in Aísa and Ordesa uplands (Central Pyrenees) are classified by the World Reference Base of Soil Resources system (WRB) and Soil Taxonomy System (STS): Bromion erecti, Nardion estrictae, Festucion eskiae and Primulion intricatae (developed on calcilutites) and Festucion gautieri (developed on hard limestones). The soils of the Nardion strictae and Festucion eskia communities are strongly acidic, desaturated and with a high organic matter content; they are classified as Humic Umbrisols by WRB (Humic Dystrocryepts by STS). The soils of the Bromion erecti and Primulion intricatae, with higher pH and base saturation than the previous ones, are classified as Phaeozems (haplic, pachic or calcaric) by WRB system (Humic Eutrocryepts or Humic Dystrocryepts by STS). The soil of the Festucion gautieri community has a neutral o basic pH, a complete base saturation and low water retention capacity; as well as scarce and irregular depth which modify its classification between Humic Leptosols and Lepto-humic Regosols by WRB (Lithic Cryorthent by STS).[ES]: Se caracterizan los suelos de cinco comunidades de pastos supraforestales en los puertos de Aísa y Ordesa (Pirineo Central): Bromion erecti, Nardion estrictae, Festucion eskiae y Primulion intricatae (desarrollados sobre calcilutitas) y Festucion gautieri (sobre calizas), clasificándose según los sistemas FAO (WRB) y Soil Taxonomy (STS). Los suelos del Nardion strictae y Festucion eskiae, suelos fuertemente ácidos, desaturados en bases y con un alto porcentaje de materia orgánica, se clasifican, según FAO, como Umbrisoles húmicos (Dystrocryepts húmicos por STS). Los suelos del Bromion erecti y Primulion intricatae, con mayor pH y saturación de bases son clasificados como Phaeozems (háplicos, páchicos o calcáricos) por FAO (Eutrocryepts o Dystrocryepts húmicos por STS). Los suelos del Festucion gautieri, poseen una reacción neutra o básica, completa saturación de bases y baja capacidad de retención de agua; la escasa e irregular profundidad hace variar su clasificación FAO entre Leptosoles húmicos y Regosoles lepto-húmicos (Cryorthent líticos por STS).Este trabajo ha contado con la financiación del Proyecto AMB97-0990 (Valoración de pastos permanentes), del Plan Nacional de I+D.Peer reviewe