Software Workbench for Interactive, Time Critical and Highly self-adaptive Cloud applications Thi... more Software Workbench for Interactive, Time Critical and Highly self-adaptive Cloud applications This project has received funding from the European Union's Horizon 2020 research and innovation programme under grant agreement No 643963 (SWITCH project).
Time critical applications are appealing to deploy in clouds due to the elasticity of cloud resou... more Time critical applications are appealing to deploy in clouds due to the elasticity of cloud resources and their on-demand nature. However, support for deploying application components with strict deadlines on their deployment is lacking in current cloud providers. This is particularly important for adaptive applications that must automatically and seamlessly scale, migrate, or recover swiftly from failures. A common deployment procedure is to transmit application packages from the application provider to the cloud, and install the application there. Thus, users need to manually deploy their applications into clouds step by step with no guarantee regarding deadlines. In this work, we propose a Deadlineaware Deployment System (DDS) for time critical applications in clouds. DDS enables users to automatically deploy applications into clouds. We design bandwidth-aware EDF scheduling algorithms in DDS that minimize the number of deployments that miss their deadlines and maximize the utilization of network bandwidth. In the evaluation, we show that DDS leverages network bandwidth sufficiently, and significantly reduces the number of missed deadlines during deployment.
GridPix detectors are thin µTPCs, they provide an excellent vertex determination for internal rad... more GridPix detectors are thin µTPCs, they provide an excellent vertex determination for internal radioactive sources and they have a 4π angular acceptance. Gridpix detectors are ideal to study anomolies in Internal Pair Conversion signaling elusive light neutral bosons.
We try to find an improved phenomenological optical potential for pionic atoms in two steps. Firs... more We try to find an improved phenomenological optical potential for pionic atoms in two steps. First, we perform a new fit of the parameters in the standard optical potentials by using a large data base of 140 pionic atom data. A x2 is obtained that is substantially lower than with any previous parameter set. In a second step, we extend the number of parameters by using a more general form for the terms quadratic in the nuclear density. This extended version yields a reduction of the x2 by about a factor of two. The new fit includes a good description of shifts and widths of the deeply bound 3d orbits in heavy nuclei such as "'Ta, na'Re, "%, '97Au, *"Pb and '*'Bi. The value of the additional parameters in the extended version are difficult to interpret in the context of the chosen form. of the optical potential and indicate that higher-order effects play a role.
Software Workbench for Interactive, Time Critical and Highly self-adaptive Cloud applications Thi... more Software Workbench for Interactive, Time Critical and Highly self-adaptive Cloud applications This project has received funding from the European Union's Horizon 2020 research and innovation programme under grant agreement No 643963 (SWITCH project).
Time critical applications are appealing to deploy in clouds due to the elasticity of cloud resou... more Time critical applications are appealing to deploy in clouds due to the elasticity of cloud resources and their on-demand nature. However, support for deploying application components with strict deadlines on their deployment is lacking in current cloud providers. This is particularly important for adaptive applications that must automatically and seamlessly scale, migrate, or recover swiftly from failures. A common deployment procedure is to transmit application packages from the application provider to the cloud, and install the application there. Thus, users need to manually deploy their applications into clouds step by step with no guarantee regarding deadlines. In this work, we propose a Deadlineaware Deployment System (DDS) for time critical applications in clouds. DDS enables users to automatically deploy applications into clouds. We design bandwidth-aware EDF scheduling algorithms in DDS that minimize the number of deployments that miss their deadlines and maximize the utilization of network bandwidth. In the evaluation, we show that DDS leverages network bandwidth sufficiently, and significantly reduces the number of missed deadlines during deployment.
GridPix detectors are thin µTPCs, they provide an excellent vertex determination for internal rad... more GridPix detectors are thin µTPCs, they provide an excellent vertex determination for internal radioactive sources and they have a 4π angular acceptance. Gridpix detectors are ideal to study anomolies in Internal Pair Conversion signaling elusive light neutral bosons.
We try to find an improved phenomenological optical potential for pionic atoms in two steps. Firs... more We try to find an improved phenomenological optical potential for pionic atoms in two steps. First, we perform a new fit of the parameters in the standard optical potentials by using a large data base of 140 pionic atom data. A x2 is obtained that is substantially lower than with any previous parameter set. In a second step, we extend the number of parameters by using a more general form for the terms quadratic in the nuclear density. This extended version yields a reduction of the x2 by about a factor of two. The new fit includes a good description of shifts and widths of the deeply bound 3d orbits in heavy nuclei such as "'Ta, na'Re, "%, '97Au, *"Pb and '*'Bi. The value of the additional parameters in the extended version are difficult to interpret in the context of the chosen form. of the optical potential and indicate that higher-order effects play a role.
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Papers by Arie Taal