1,601 research outputs found
âI Will Never Forget the Sound of those Engines Going Awayâ: A Re-Examination of the Sinking of HMCS \u3cem\u3eAthabaskan\u3c/em\u3e, 29 April 1944
On the morning of 29 April 1944 the Canadian Tribal Class Destroyer HMCS Athabaskan was sunk in the English Channel after an engagement with the German Elbing Class Destroyers T-24 and T-27. The official explanation from the âinquiry into the Loss of HMCS Athabaskanâ claimed that Athabaskan sank because of two explosions, the first at 0417 hours, and the second at 0427 hours. The first explosion was attributed to a torpedo from T-24. The second explosion was believed to have occurred when fuel fires, caused by the first explosion, ignited the 4-inch magazine. While this may seem simple and complete, an examination of the source material reveals that there is much confusion as to the actual chain of events. This confusion is focused on the cause of the second explosion. Eyewitness accounts have Athabaskan being torpedoed twice on the port side. This explanation seems to have been discounted by the Board. Then there are Athabaskan and Haidaâs reports of âthree echoesâ being seen on the radar and Commander DeWolfâs assertion that German E-boats were involved. This assertion became the basis for Len Burrow and Emile Beaudoinâs book Unlucky Lady: The Life and Death of HMCS Athabaskan. Yet this book raises more questions than it answers. The E-boat mystery has been put to rest by Michael Whitby, in his article ââFooling Around The French Coastâ: RCN Tribal Class Destroyers in Action, April 1944.â He cites the German record of the action and states that the only German vessels involved were T-24 and T-27. This has resulted in the British inquiry being deemed officially correct, with credit for the sinking being attributed to T-24. Yet this confusion is compounded by the statement in the inquiryâs report that the members of the board: âdid not consider [whether] any other ships were present.â This is a curious statement. It is quite likely that another ship was indeed present. Unfortunately, it may have been the British Motor Torpedo Boat (MTB) 677 (commanded by Lieutenant A. Clayton, RNVR).
All reconstructions of the action on 29 April 1944 have centred on the movements of Haida and Athabaskan beginning at 0400 hours. Yet the actions of all of the other participants must be reviewed to fully understand the situation. The movements of the other forces have, to date, been ignored. When the positions of the Tribals, the minelayers and the MTBâs are plotted together, the inferences become astounding
Information technologies that facilitate care coordination: provider and patient perspectives
Health information technology is a core infrastructure for the chronic care model, integrated care, and other organized care delivery models. From the provider perspective, health information exchange (HIE) helps aggregate and share information about a patient or population from several sources. HIE technologies include direct messages, transfer of care, and event notification services. From the patient perspective, personal health records, secure messaging, text messages, and other mHealth applications may coordinate patients and providers. Patient-reported outcomes and social media technologies enable patients to share health information with many stakeholders, including providers, caregivers, and other patients. An information architecture that integrates personal health record and mHealth applications, with HIEs that combine the electronic health records of multiple healthcare systems will create a rich, dynamic ecosystem for patient collaboration
Concerted hydrogen atom exchange between three HF molecules
We have investigated the termolecular reaction involving concerted hydrogen exchange between three HF molecules, with particular emphasis on the effects of correlation at the various stationary points along the reaction. Using an extended basis, we have located the geometries of the stable hydrogen-bonded trimer, which is of C(sub 3h) symmetry, and the transition state for hydrogen exchange, which is of D(sub 3h) symmetry. The energies of the exchange reation were then evaluated at the correlated level, using a large atomic natural orbital basis and correlating all valence electrons. Several correlation treatments were used, namely, configration interaction with single and double excitations, coupled-pair functional, and coupled-cluster methods. We are thus able to measure the effect of accounting for size-extensivity. Zero-point corrections to the correlated level energetics were determined using analytic second derivative techniques at the SCF level. Our best calculations, which include the effects of connected triple excitations in the coupled-cluster procedure, indicate that the trimer is bound by 9 +/- 1 kcal/mol relative to three separate monomers, in excellent agreement with previous estimates. The barrier to concerted hydrogen exchange is 15 kcal/mol above the trimer, or only 4.7 kcal/mol above three separated monomers. Thus the barrier to hydrogen exchange between HF molecules via this termolecular process is very low
Associating object names with descriptions of shape that distinguish possible from impossible objects.
Five experiments examine the proposal that object names are closely linked torepresentations of global, 3D shape by comparing memory for simple line drawings of structurally possible and impossible novel objects.Objects were rendered impossible through local edge violations to global coherence (cf. Schacter, Cooper, & Delaney, 1990) and supplementary observations confirmed that the sets of possible and impossible objects were matched for their distinctiveness. Employing a test of explicit recognition memory, Experiment 1 confirmed that the possible and impossible objects were equally memorable. Experiments 2â4 demonstrated that adults learn names (single-syllable non-words presented as count nouns, e.g., âThis is a daxâ) for possible objectsmore easily than for impossible objects, and an item-based analysis showed that this effect was unrelated to either the memorability or the distinctiveness of the individual objects. Experiment 3 indicated that the effects of object possibility on name learning were long term (spanning at least 2months), implying that the cognitive processes being revealed can support the learning of object names in everyday life. Experiment 5 demonstrated that hearing someone else name an object at presentation improves recognition memory for possible objects, but not for impossible objects. Taken together, the results indicate that object names are closely linked to the descriptions of global, 3D shape that can be derived for structurally possible objects but not for structurally impossible objects. In addition, the results challenge the view that object decision and explicit recognition necessarily draw on separate memory systems,with only the former being supported by these descriptions of global object shape. It seems that recognition also can be supported by these descriptions, provided the original encoding conditions encourage their derivation. Hearing an object named at encoding appears to be just such a condition. These observations are discussed in relation to the effects of naming in other visual tasks, and to the role of visual attention in object identification
Complete Problems for Multi-Pseudodeterministic Computations
We exhibit several computational problems that are complete for multi-pseudodeterministic computations in the following sense: (1) these problems admit 2-pseudodeterministic algorithms (2) if there exists a pseudodeterministic algorithm for any of these problems, then any multi-valued function that admits a k-pseudodeterministic algorithm for a constant k, also admits a pseudodeterministic algorithm. We also show that these computational problems are complete for Search-BPP: a pseudodeterministic algorithm for any of these problems implies a pseudodeterministic algorithm for all problems in Search-BPP
List and Certificate Complexities in Replicable Learning
We investigate replicable learning algorithms. Ideally, we would like to
design algorithms that output the same canonical model over multiple runs, even
when different runs observe a different set of samples from the unknown data
distribution. In general, such a strong notion of replicability is not
achievable. Thus we consider two feasible notions of replicability called list
replicability and certificate replicability. Intuitively, these notions capture
the degree of (non) replicability. We design algorithms for certain learning
problems that are optimal in list and certificate complexity. We establish
matching impossibility results
A random matrix decimation procedure relating to
Classical random matrix ensembles with orthogonal symmetry have the property
that the joint distribution of every second eigenvalue is equal to that of a
classical random matrix ensemble with symplectic symmetry. These results are
shown to be the case of a family of inter-relations between eigenvalue
probability density functions for generalizations of the classical random
matrix ensembles referred to as -ensembles. The inter-relations give
that the joint distribution of every -st eigenvalue in certain
-ensembles with is equal to that of another
-ensemble with . The proof requires generalizing a
conditional probability density function due to Dixon and Anderson.Comment: 19 pages, 1 figur
Updating Action Descriptions and Plans for Cognitive Agents
Extended Abstract and Poster PresentationPostprin
Geometry of Rounding
Rounding has proven to be a fundamental tool in theoretical computer science.
By observing that rounding and partitioning of are equivalent,
we introduce the following natural partition problem which we call the {\em
secluded hypercube partition problem}: Given (ideally small)
and (ideally large), is there a partition of with
unit hypercubes such that for every point , its closed
-neighborhood (in the norm) intersects at most
hypercubes?
We undertake a comprehensive study of this partition problem. We prove that
for every , there is an explicit (and efficiently computable)
hypercube partition of with and . We complement this construction by proving that the value of
is the best possible (for any ) for a broad class of
``reasonable'' partitions including hypercube partitions. We also investigate
the optimality of the parameter and prove that any partition in this
broad class that has , must have .
These bounds imply limitations of certain deterministic rounding schemes
existing in the literature. Furthermore, this general bound is based on the
currently known lower bounds for the dissection number of the cube, and
improvements to this bound will yield improvements to our bounds.
While our work is motivated by the desire to understand rounding algorithms,
one of our main conceptual contributions is the introduction of the {\em
secluded hypercube partition problem}, which fits well with a long history of
investigations by mathematicians on various hypercube partitions/tilings of
Euclidean space
Geometry of Rounding: Near Optimal Bounds and a New Neighborhood Sperner's Lemma
A partition of is called a
-secluded partition if, for every ,
the ball intersects at most
members of . A goal in designing such secluded partitions is to
minimize while making as large as possible. This partition
problem has connections to a diverse range of topics, including deterministic
rounding schemes, pseudodeterminism, replicability, as well as Sperner/KKM-type
results.
In this work, we establish near-optimal relationships between and
. We show that, for any bounded measure partitions and for any
, it must be that . Thus, when is
restricted to , it follows that . This bound is tight up to log factors, as it is
known that there exist secluded partitions with and
. We also provide new constructions of secluded
partitions that work for a broad spectrum of and
parameters. Specifically, we prove that, for any
, there is a secluded partition with
and
. These new partitions are optimal up to
factors for various choices of and . Based
on the lower bound result, we establish a new neighborhood version of Sperner's
lemma over hypercubes, which is of independent interest. In addition, we prove
a no-free-lunch theorem about the limitations of rounding schemes in the
context of pseudodeterministic/replicable algorithms
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