Metal–insulator–semiconductor electrostatics of carbon nanotubes

Carbon nanotube metal-insulator-semiconductor capacitors are examined theoretically. For the densely packed array of nanotubes on a planar insulator, the capacitance per tube is reduced due to the screening of the charge on the gate plane by the neighboring nanotubes. In contrast to the silicon metal-oxide-semiconductor capacitors, the calculated C-VC-V curves reflect the local peaks of the one-dimensional density-of-states in the nanotube. This effect provides the possibility to use C-VC-V measurements to diagnose the electronic structures of nanotubes. Results of the electrostatic calculations can also be applied to estimate the upper-limit on-current of carbon nanotube field-effect transistors

Cloud Computing in Virtual Environments

In this paper we present the basis of a new middleware service that provisions clouds for virtual organizations (VOs).This service makes use of a virtual environment\u27s inherent ability to render objects to represent clouds with real clouds. These clouds are created on demand by avatars and tagged to provide a rudimentary semantic that can be used for searching. Clouds are then loaded with an inventory that contains objects and scripts used to access remote resources. Compute resources, sensor networks, and visualization services can be part of the cloud\u27s inventory. Second Life is used to implement this cloud computing service. The authorization mechanism of Second Life and an external database managed by our cloud service is used to restrict access to clouds based on avatar roles and group membership.We argue that this service can be used effectively by a VO to provide a very interactive experience for its members as well as potential collaboration between multiple VOs. Cloud computing takes a very figurative meaning in our work since we literally create clouds in the environment and manage their ownership, access and capabilities. We believe this innovative work brings together grid computing, social networking and virtual environments in a very attractive and understandable way

A simple quantum mechanical treatment of scattering in nanoscale transistors

We present a computationally efficient, two-dimensional quantum mechanical simulation scheme for modeling dissipative electron transport in thin body, fully depleted, n-channel, silicon-on-insulator transistors. The simulation scheme, which solves the nonequilibrium Green’s function equations self consistently with Poisson’s equation, treats the effect of scattering using a simple approximation inspired by the “Büttiker probes,” often used in mesoscopic physics. It is based on an expansion of the active device Hamiltonian in decoupled mode space. Simulation results are used to highlight quantum effects, discuss the physics of scattering and to relate the quantum mechanical quantities used in our model to experimentally measured low field mobilities.Additionally, quantum boundary conditions are rigorously derived and the effects of strong off-equilibrium transport are examined. This paper shows that our approximate treatment of scattering, is an efficient and useful simulation method for modeling electron transport in nanoscale, silicon-on-insulator transistor

Moving Forward: Refinement of the INTELLIGENT RIVER, A Basin-Scale Monitoring Instrument

2012 S.C. Water Resources Conference - Exploring Opportunities for Collaborative Water Research, Policy and Managemen

Computing in High Energy and Nuclear Physics (CHEP) 2012

From Grid to Cloud: A Perspectiv

Going Serverless with Knative on Kubernetes

Abstract: After reviewing some of the latest evolutions in Kubernetes we will discuss the serverless computing paradigm and highlight a few application use-cases. We will then introduce Knative, a system built on top of Kubernetes which provides components to build and serve applications as well as manage events. Through quick demos will demonstrate several key capabilities like scaling to zero and also highlight future directions with service mesh technologies. Bio: Sebastien is the co-founder of TriggerMesh (https://triggermesh.com) a serverless management platform built on Knative. He is the author of the Docker and Kubernetes O'Reilly cookbooks and was the CMS Tier-2 site lead at Purdue University more than 10 years ago

Enabling Autonomic Adaption of Virtual Computational Environments in a Shared Distributed Infrastructure

A shared distributed infrastructure is formed by federating computation resources from multiple domains. Such a shared infrastructure provides aggregated computation resources to a large number of users. Meanwhile, virtualization technologies, at machine and network levels, are maturing and enabling mutually isolated virtual computation environments for executing arbitrary parallel/distributed applications on top of such a shared physical infrastructure. In this paper, we take one step further by supporting autonomic adaptation of virtual computation environments as active. integrated entities. More specifically, driven by both dynamic availability of infrastructure resources and dynamic application resource demand, a virtual computation environment is able to automatically re-locate itself across the infrastructure an

Kestrel: An XMPP-based framework for many task computing applications

ABSTRACT This paper presents a new distributed computing framework for Many Task Computing (MTC) applications, based on the Extensible Messaging and Presence Protocol (XMPP). A lightweight, highly available system, named Kestrel, has been developed to explore XMPP-based techniques for improving MTC system tolerance to faults that result from scaling and intermittent computing agent presence. By leveraging technologies used in large instant messaging systems that scale to millions of clients, this MTC system is designed to scale to millions of agents at various levels of granularity: cores, machines, clusters, and even sensors, which makes it a good fit for MTC. Kestrel's architecture is inspired by the distributed design of pilot job frameworks on the grid as well as botnets, with the addition of a commodity instant messaging protocol for communications. Whereas botnet command-andcontrol systems have frequently used a combination of Internet Relay Chat (IRC), Distributed Has