1,252,688 research outputs found
Professor Graham Zellick
Profile of Professor Graham Zellick, interviewed when he took over as Vice-Chancellor of the University of London in September 1997. He spoke to Julian Harris about what his role entailed, and how he intended to pursue his objectives. Published in the Profile section of Amicus Curiae - Journal of the Institute of Advanced Legal Studies and its Society for Advanced Legal Studies. The Journal is produced by the Society for Advanced Legal Studies at the Institute of Advanced Legal Studies, University of London
Roscoe Reid Graham (1890 to 1948): a Canadian pioneer in general surgery.
Roscoe Reid Graham, a Canadian surgeon trained at the University of Toronto, was a true pioneer in the field of general surgery. Although he may be best known for his omental patch repair of perforated duodenal ulcers-often referred to as the Graham patch -he had a number of other significant accomplishments that decorated his surgical career. Dr. Graham is credited with being the first surgeon to successfully enucleate an insulinoma. He ventured to do an essentially brand new operation based solely on his patient\u27s symptoms and physical findings, a courageous move that even some of the most talented surgeons would shy away from. He also spent a large portion of his career dedicated to the study of rectal prolapse, working tirelessly to rid his patients of this awful affliction. He was recognized by a number of different surgical associations for his operative successes and was awarded membership to those both in Canada and the United States. Despite all of these accolades, Dr. Graham remained grounded and always fervent in his dedication to the patient and their presenting symptom(s), reminding us that to do anything more would be meddlesome. In an age when medical professionals are often all too eager to make unnecessary interventions, it is imperative that we look back at our predecessors such as Roscoe Reid Graham, for they will continually redirect us toward our one and only obligation: the patient
Optimising the number of channels in EEG-augmented image search
Recent proof-of-concept research has appeared showing the applicability of Brain Computer Interface (BCI) technology in combination with the human visual system, to classify images. The basic premise here is that images that arouse a participantâs attention generate a detectable response in their brainwaves, measurable using an electroencephalograph (EEG). When a participant is given a target class of images to search for, each image belonging to that target class presented within a stream of images should elicit a distinctly detectable neural response. Previous work in this domain has primarily focused on validating the technique on proof of concept image sets that demonstrate desired properties and on examining the capabilities of the technique at various image presentation speeds. In this paper we expand on this by examining the capability of the technique when using a reduced number of channels in the EEG, and its impact on the detection accuracy
A remembrance of things (best) forgotten: The 'allegorical past' and the feminist imagination
This is the author's PDF version of an article published in Feminist theology© 2012. The definitive version is available at http://fth.sagepub.com/This article discusses the US TV series Mad Men, which is set in an advertising agency in 1960s New York, in relation to two key elements which seem significant for a consideration of the current state of feminism in church and academy, both of which centre around what it means to remember or (not) to forget
Holographic Renormalization and Stress Tensors in New Massive Gravity
We obtain holographically renormalized boundary stress tensors with the
emphasis on a special point in the parameter space of three dimensional new
massive gravity, using the so-called Fefferman-Graham coordinates with relevant
counter terms. Through the linearized equations of motion with a standard
prescription, we also obtain correlators among these stress tensors. We argue
that the self-consistency of holographic renormalization determines counter
terms up to unphysical ambiguities. Using these renormalized stress tensors in
Fefferman-Graham coordinates, we obtain the central charges of dual CFT, and
mass and angular momentum of some black hole solutions. These results are
consistent with the previous ones obtained by other methods. In this study on
the Fefferman-Graham expansion of new massive gravity, some aspects of higher
curvature gravity are revealed.Comment: Version accepted for publication in JHEP, conclusion revised,
references adde
Distance matrices of a tree: two more invariants, and in a unified framework
Graham-Pollak showed that for the distance matrix of a tree ,
det depends only on its number of edges. Several other variants of ,
including directed/multiplicative/- versions were studied, and always,
det depends only on the edge-data.
We introduce a general framework for bi-directed weighted trees, with
threefold significance. First, we improve on state-of-the-art for all known
variants, even in the classical Graham-Pollak case: we delete arbitrary pendant
nodes (and more general subsets) from the rows/columns of , and show these
minors do not depend on the tree-structure.
Second, our setting unifies all known variants (with entries in a commutative
ring). We further compute in closed form the inverse of , extending a result
of Graham-Lovasz [Adv. Math. 1978] and answering a question of Bapat-Lal-Pati
[Lin. Alg. Appl. 2006].
Third, we compute a second function of the matrix : the sum of all its
cofactors, cof. This was worked out in the simplest setting by
Graham-Hoffman-Hosoya (1978), but is relatively unexplored for other variants.
We prove a stronger result, in our general setting, by computing cof for
minors as above, and showing these too depend only on the edge-data.
Finally, we show our setting is the 'most general possible', in that with
more freedom in the edgeweights, det and cof depend on the tree
structure. In a sense, this completes the study of the invariant det
(and cof) for trees with edge-data in a commutative ring.
Moreover: for a bi-directed graph we prove multiplicative
Graham-Hoffman-Hosoya type formulas for det, cof, . We
then show how this subsumes their 1978 result. The final section introduces and
computes a third, novel invariant for trees and a Graham-Hoffman-Hosoya type
result for our "most general" distance matrix .Comment: 42 pages, 2 figures; minor edits in the proof of Theorems A and 1.1
The Poset of Hypergraph Quasirandomness
Chung and Graham began the systematic study of k-uniform hypergraph
quasirandom properties soon after the foundational results of Thomason and
Chung-Graham-Wilson on quasirandom graphs. One feature that became apparent in
the early work on k-uniform hypergraph quasirandomness is that properties that
are equivalent for graphs are not equivalent for hypergraphs, and thus
hypergraphs enjoy a variety of inequivalent quasirandom properties. In the past
two decades, there has been an intensive study of these disparate notions of
quasirandomness for hypergraphs, and an open problem that has emerged is to
determine the relationship between them.
Our main result is to determine the poset of implications between these
quasirandom properties. This answers a recent question of Chung and continues a
project begun by Chung and Graham in their first paper on hypergraph
quasirandomness in the early 1990's.Comment: 43 pages, 1 figur
- âŠ