Often, solutions to complex problems are found in nature. Swarm algorithms are capable of solving such complex problems by implementing patterns from nature. This patterns are found in a variety of ...scientific fields. In this paper, we discuss two swarm algorithms extracted from Biology and Physics, namely: Multiobjective Artificial Bee Colony (MOABC) and Multiobjective Gravitational Search Algorithm (MOGSA). The first one is based on bees behavior and the other follows the gravity between masses. These algorithms are implemented to solve the grid scheduling problem. Optimization of job scheduling is one of the most challenging tasks in Grid environments because it severely affects the execution time of an experiment (set of jobs). Experiments often are tied up to fulfill deadlines and budgets. One of the main contributions of this work is adding multiobjective processes to these swarm algorithms to minimize those conflictive objectives. Results show that MOABC clearly improves the MOGSA approach when solving the problem. MOABC is also compared with real grid meta-schedulers as Deadline Budget Constraint (DBC) and Workload Management System (WMS) by using the simulator GridSim to prove the improvement that offers this new algorithm.
Enabling Digital Repositories on the Grid Calanducci, Antonio; Castrillo, Francisco Prieto; Pollán, Raúl Ramos ...
2008 The Second International Conference on Advanced Engineering Computing and Applications in Sciences,
2008-Sept.
Conference Proceeding
In this work we present gLibrary/DRI, a Grid-based multirepository environment designed to ease the deployment and hosting of repositories on top of Grid eInfrastructures. Grid environments present ...several facilities that are worthy for digital repositories. The most important ones are strong security contexts, the data federation, the information sharing and the availability of large computing and storage capacity. The gLibrary/DRI platform offers to arbitrary repositories default implementations for the storage system and node navigation, algorithm launching mechanisms and easy integration with viewer tools for representing the content of the repositories. In particular, we present two examples (1) for hosting a Mammograms archive having several features that help clinicians to make diagnosis through easy inspection of the repository contents (2) for driving and hosting scientific production for non linear dynamics problems formulated as phase spaces.
The present paper describes the development of the CardioGrid framework into the Grid infrastructure. The core Grid services; workload management system (WMS), data management system and grid ...authentication have been implemented. Additionally, a Web-based tool -the CardioGrid portal-has been developed to facilitate the user interaction with the Grid. As a result, the user is able to process the electrocardiogram (ECG) signals obtained form a portable data acquisition device and to process them on the Grid. Once the CardioGrid portal is prompted and the user identity is verified through a digital X.509 certificate, the operator may either upload new raw ECG data to the grid storage elements or use already stored data. Then, subsequent analytics from these data are performed as Grid jobs and relevant medical quantities are derived through a middleware job retrieval mechanism. In summary, this paper describes the development of a medical Grid based system, and its integration to an existing platform for digital repositories infrastructure.
The EPICO (Spanish general registry of COVID‐19 in children)‐SEHOP (Spanish Society of Pediatric Hematology and Oncology) platform gathers data from children with SARS‐CoV‐2 in Spain, allowing ...comparison between children with cancer or allogeneic hematopoietic stem cell transplantation (alloHSCT) and those without. The infection is milder in the cancer/alloHSCT group than in children without comorbidities (7.1% vs. 14.7%), except in children with recent alloHSCT (less than 300 days), of which 35.7% experienced severe COVID‐19. These data have been shared with the SEHOP members to support treatment and isolation policies akin to those for children without cancer, except for those with recent alloHSCT or additional comorbidities. This highlights the collaborative registries potential in managing pandemic emergencies.
PDF
