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Search Results: 1 - 10 of 18527 matches for " Andrew Clarke "
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The Internet of Things and Next-generation Public Health Information Systems  [PDF]
Robert Steele, Andrew Clarke
Communications and Network (CN) , 2013, DOI: 10.4236/cn.2013.53B1002
Abstract: The Internet of things has particularly novel implications in the area of public health. This is due to (1) The rapid and widespread adoption of powerful contemporary Smartphone’s; (2) The increasing availability and use of health and fitness sensors, wearable sensor patches, smart watches, wireless-enabled digital tattoos and ambient sensors; and (3) The nature of public health to implicitly involve connectivity with and the acquisition of data in relation to large numbers of individuals up to population scale. Of particular relevance in relation to the Internet of Things (IoT) and public health is the need for privacy and anonymity of users. It should be noted that IoT capabilities are not inconsistent with maintaining privacy, due to the focus of public health on aggregate data not individual data and broad public health interventions. In addition, public health information systems utilizing IoT capabilities can be constructed to specifically ensure privacy, security and anonymity, as has been developed and evaluated in this work. In this paper we describe the particular characteristics of the IoT that can play a role in enabling emerging public health capabilities; we describe a privacy-preserving IoT-based public health information system architecture; and provide a privacy evaluation.
Minimal Surfaces in G2 Manifolds
Andrew Clarke
Mathematics , 2010,
Abstract: We consider immersions of a Riemann surface into a manifold with $G_2$-holonomy and give criteria for them to be conformal and harmonic, in terms of an associated Gauss map.
Rigidity of Rank-One Factors of Compact Symmetric Spaces
Andrew Clarke
Mathematics , 2009,
Abstract: We consider the decomposition of a compact-type symmetric space into a product of factors and show that the rank-one factors, when considered as totally geodesic submanifolds of the space, are isolated from inequivalent minimal submanifolds.
Instantons on the exceptional holonomy manifolds of Bryant and Salamon
Andrew Clarke
Mathematics , 2013, DOI: 10.1016/j.geomphys.2014.04.006
Abstract: We give a construction of $G_2$ and $Spin(7)$ instantons on exceptional holonomy manifolds constructed by Bryant and Salamon, by using an ansatz of spherical symmetry coming from the manifolds being the total spaces of rank-4 vector bundles. In the $G_2$ case, we show that, in the asymptotically conical model, the connections are asymptotic to Hermitian Yang-Mills connections on the nearly K\"ahler $S^3\times S^3$.
An Innovative Approach in Balancing Real Power Using Plug in Hybrid Electric Vehicles  [PDF]
Andrew D. Clarke, Elham B. Makram
Journal of Power and Energy Engineering (JPEE) , 2014, DOI: 10.4236/jpee.2014.210001
Abstract:

Many distribution systems operate under unbalanced loading conditions due to the connection of single phase loads to a three phase system. As PHEVs become more prevalent, it is expected that this unbalance will be further exacerbated due to the power draws from single phase chargers. Unbalanced loads reduce the overall system operating efficiency and power transfer capability of assets. In this paper, a new method of mitigating real power unbalance is suggested. It works by selecting which of the three phases that each single phase PHEV charger in a car park should be connected to. The algorithm is then tested on a simulation model of a real world distribution system. Using the balancing algorithm, balancing of the real power flowing through the feeder to the car park is accomplished.

A Novel Idea for Self-Balancing Car Parks for Plug in Electric Vehicle Charging  [PDF]
Andrew D. Clarke, Elham B. Makram
Journal of Power and Energy Engineering (JPEE) , 2014, DOI: 10.4236/jpee.2014.210005
Abstract:

Many existing studies seek to examine and mitigate possible impacts which plug in vehicle (PEV) charging will have on electric utilities. As PEVs increase in popularity, car parks will have to be built in order to allow for charging while away from home. Existing studies fail to consider the unbalance conditions in the distribution feeders to car parks during PEV charging. This paper presents an innovative idea to improve the unbalance conditions caused by a car park by reconfiguring PEV charger connections to a three-phase system. Although the developed algorithm is simple, results show its ability to balance the power among the phases. A car park is used as an example to show that balancing of the real power drawn by PEV chargers in a parking structure is a success.

A Comprehensive Analysis of Plug in Hybrid Electric Vehicles to Commercial Campus (V2C)  [PDF]
Andrew D. Clarke, Elham B. Makram
Journal of Power and Energy Engineering (JPEE) , 2015, DOI: 10.4236/jpee.2015.31003
Abstract: Vehicle to grid is an emerging technology that utilizes plug in hybrid electric vehicle batteries to benefit electric utilities during times when the vehicle is parked and connected to the electric grid. In its current form however, vehicle to grid implementation poses many challenges that may not be easily overcome and many existing studies neglect critical aspects such as battery cost or driving profiles. The goal of this research is to ease some of these challenges by examining a vehicle to grid scenario on a university campus, as an example of a commercial campus, based on time of use electricity rates. An analysis of this scenario is conducted on a vehicle battery as well as a stationary battery for comparison. It is found that vehicle to campus and a stationary battery both have the potential to prove economical based on battery cost and electricity rates.
The Perron Method and the Non-Linear Plateau Problem
Andrew Clarke,Graham Smith
Mathematics , 2009,
Abstract: We describe a novel technique for solving the Plateau problem for constant curvature hypersurfaces based on recent work of Harvey and Lawson. This is illustrated by an existence theorem for hypersurfaces of constant Gaussian curvature in $\Bbb{R}^{n+1}$.
Lower bounds on the modified K-energy and complex deformations
Andrew Clarke,Carl Tipler
Mathematics , 2013,
Abstract: Let (X,L) be a polarized K\"ahler manifold that admits an extremal K\"ahler metric in c1(L). We show that on a nearby polarized deformation that preserves the symmetry induced by the extremal vector field of (X,L), the modified K-energy is bounded from below. This generalizes a result of Chen, Sz\'ekelyhidi and Tosatti to extremal metrics. Our proof also extends a convexity inequality on the space of K\"ahler potentials due to X.X. Chen to the extremal metric setup. As an application, we compute explicit polarized 4-points blow-ups of CP1\times CP1 that carry no extremal metric but with modified K-energy bounded from below.
Holonomy Groups in Riemannian Geometry
Andrew Clarke,Bianca Santoro
Mathematics , 2012,
Abstract: Lecture notes for the minicourse "Holonomy Groups in Riemannian geometry", a part of the XVII Brazilian School of Geometry, to be held at UFAM (Amazonas, Brazil), in July of 2012.
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