Happy Graduation.

High school graduation is often considered the first step into a life of new beginnings, independence, and quasi-adulthood. It is a time of celebration, a time to recognize that all of those years of hard work have paid off. Of course, there are graduation presents from family members to reward all of that work and congratulate the graduate for beginning of the rest of their lives. My graduation present, though, is something I hope I never find a use for. [excerpt

MS-232: Edward A Frederick Papers

This collection is a small collection mostly comprised of postcards written by Edward A. Frederick to his family. The postcards follow Frederick from his training with the Aero Squadron in San Antonio Texas at Kelly Field to his service overseas in the UK and France. The collection also contains photographs, a newspaper clipping, and a ring and pins from the US Aero Squadron. Overall, the postcards and the collection as a whole do not provide much insight or detail about the life of a soldier during WWI. Special Collections and College Archives Finding Aids are discovery tools used to describe and provide access to our holdings. Finding aids include historical and biographical information about each collection in addition to inventories of their content. More information about our collections can be found on our website http://www.gettysburg.edu/special_collections/collections/.https://cupola.gettysburg.edu/findingaidsall/1195/thumbnail.jp

MS- 241: Harry Dravo Parkin WWI Memoir

This small collection includes five bound volumes of a memoir written by Harry Dravo Parkin. The collection contains information regarding his experience in WWI as a wounded prisoner of war as well as everyday life as a major. Special Collections and College Archives Finding Aids are discovery tools used to describe and provide access to our holdings. Finding aids include historical and biographical information about each collection in addition to inventories of their content. More information about our collections can be found on our website https://www.gettysburg.edu/special-collections/collections/.https://cupola.gettysburg.edu/findingaidsall/1205/thumbnail.jp

MS-234: Richard Buchter ’54 Papers

This collection includes newspaper clippings, photographs, Vietnamese leaflets relating to the Psychological Operations of the Vietnam War, other military-related documents, and Vietnamese paraphernalia Buchter gathered during his service as the Base Operations Officer in Da Nang during the Vietnam War. Possible research interests lie in the Vietnam War, specifically PSYOPs and the Air Force. Special Collections and College Archives Finding Aids are discovery tools used to describe and provide access to our holdings. Finding aids include historical and biographical information about each collection in addition to inventories of their content. More information about our collections can be found on our website https://www.gettysburg.edu/special-collections/collections/.https://cupola.gettysburg.edu/findingaidsall/1199/thumbnail.jp

John Bell Across Space and Time

This is a review of the book Quantum [Un]speakables: From Bell to Quantum Information. Reinhold A. Bertlmann and Anton Zeilinger (editors).Comment: 4 pages LaTe

Clustering based on Random Graph Model embedding Vertex Features

Large datasets with interactions between objects are common to numerous scientific fields (i.e. social science, internet, biology...). The interactions naturally define a graph and a common way to explore or summarize such dataset is graph clustering. Most techniques for clustering graph vertices just use the topology of connections ignoring informations in the vertices features. In this paper, we provide a clustering algorithm exploiting both types of data based on a statistical model with latent structure characterizing each vertex both by a vector of features as well as by its connectivity. We perform simulations to compare our algorithm with existing approaches, and also evaluate our method with real datasets based on hyper-textual documents. We find that our algorithm successfully exploits whatever information is found both in the connectivity pattern and in the features

On the quantum probability flux through surfaces

We remark that the often ignored quantum probability current is fundamental for a genuine understanding of scattering phenomena and, in particular, for the statistics of the time and position of the first exit of a quantum particle from a given region, which may be simply expressed in terms of the current. This simple formula for these statistics does not appear as such in the literature. It is proposed that the formula, which is very different from the usual quantum mechanical measurement formulas, be verified experimentally. A full understanding of the quantum current and the associated formula is provided by Bohmian mechanics.Comment: 15 pages, 3 figures, revised and more detailed version, to be published in Journal of Statistical Physics, August 9

Strategies for online inference of model-based clustering in large and growing networks

In this paper we adapt online estimation strategies to perform model-based clustering on large networks. Our work focuses on two algorithms, the first based on the SAEM algorithm, and the second on variational methods. These two strategies are compared with existing approaches on simulated and real data. We use the method to decipher the connexion structure of the political websphere during the US political campaign in 2008. We show that our online EM-based algorithms offer a good trade-off between precision and speed, when estimating parameters for mixture distributions in the context of random graphs.Comment: Published in at http://dx.doi.org/10.1214/10-AOAS359 the Annals of Applied Statistics (http://www.imstat.org/aoas/) by the Institute of Mathematical Statistics (http://www.imstat.org