Volunteer computing (VC) has become a relatively mature technique of distributed computing. It is based on exploiting the idle time of ordinary online machines with the consent of their owners. Target applications are generally scientific projects requiring a huge amount of computational resources. Existing VC platforms raise several challenges. This work attempts to bring solutions for two defeats. The first one is the involvement of volunteers; the decreasing of participants affects the global performances. To cope with this, a new social volunteer computing environment is proposed in order to involve more volunteers. The second addressed problem is the task scheduling, which aims to optimize the use of resources. The proposed algorithm generates for each resource's class, a number of tasks whose cost of execution reflects the momentary capacity of the resources. The new solutions are validated through a theory of number's project, called “Collatz Conjecture.”
In this work, a novel multifunction, multiband, and implantable PIFA antenna for biomedical telemetry is proposed. The covered frequency bands are the Medical Device Radiocommunications Service (MedRadio) (401 – 406 MHz), and Industrial, Scientific, and Medical (ISM) (433.1 – 434.8, and 902.8 – 928.0 MHz, and 2.4 – 2.4835 GHz), and the Wireless Medical Telemetry Service (WMTS) (1.395 – 1.400, and 1.427 – 1.432 GHz). The third ISM frequency band is reserved to the Wireless Power Transfer (WPT) function, The fourth ISM frequency band is dedicated to the wake - up operation, and the other operation frequency bands are proposed for data telemetry communications. The miniaturization is achieved by the shorting in PIFA, the radiating patch shaping by meandering and arms inserting, and open-ended slots inserting in the ground plane, the occupied volume is of 78.52mm 3 . Both the Equivalent Isotropic Radiated Power (EIRP) and the Specific Absorption Rate (SAR) restrictions are considered for the data telemetry, and the WPT functions performances. The obtained performances make the proposed antenna a good candidate for telemetry functions through muscle implants devices.
The study of the seismic behavior of tunnels has become a major concern for geotechnicians in recent years, especially after the collapse of the many underground structures around the world, constructed in soft ground at shallow depths. Several studies focused on the distortion of the tunnel cross section caused by shear waves which propagate vertically to the tunnel axis. However, the study of the tunnel seismic response to the compression waves which propagate parallel to the axis of the tunnel is almost neglected. These compression waves can cause a serious axial and bending deformation in the tunnel lining. Therefore, this paper aims to present a numerical analysis of part of the T1 tunnel of the Algerian East-West Highway, in the province of Constantine, that suffered a very significant damage caused by a sudden collapse. The goal is to demonstrate the influence of seismic waves of compression as well …