1,416,622 research outputs found
Hadrons in the Nuclear Medium-Role of Light Front Nuclear Theory
The problem of understanding the nuclear effects observed in lepton-nucleus
deep-inelastic-scattering (the EMC effect) is still with us. Standard nuclear
models (those using only hadronic degrees of freedom) are not able to account
for the EMC effect. Thus it is necessary to understand how the nuclear medium
modifies quark wave functions in the nucleus. Possibilities for such
modifications, represented by the quark meson coupling model, and the
suppression of point-like-configurations are discussed, and methods to
experimentally choose between these are reviewed.Comment: 12 pages 5 figures Written version of a plenary talk at the
conference Baryons 2002, March 200
Affordable Housing and the Conflict of Competing Goods: A Policy Dilemma
This paper, which was the keynote address at a conference on Affordable Housing and Pubic Private Partnerships at the University of Colorado Law School, is designed to point out the conflicts between various competing social “goods” in relation to the provision of affordable housing. In a world of finite resources in which competing goods cannot both be maximized at the same time, when the goods are incommensurable, how ought a society choose among them? The paper focuses on such issues as preservation of affordable housing and wealth creation; affordability and handicapped accessibility or green development. It examines various methods of societal choosing and provides a critique of each such method. It then cautions policy makers to be conscious of these incommensurable goals and to determine how to prioritize them
Ultimate Intelligence Part I: Physical Completeness and Objectivity of Induction
We propose that Solomonoff induction is complete in the physical sense via
several strong physical arguments. We also argue that Solomonoff induction is
fully applicable to quantum mechanics. We show how to choose an objective
reference machine for universal induction by defining a physical message
complexity and physical message probability, and argue that this choice
dissolves some well-known objections to universal induction. We also introduce
many more variants of physical message complexity based on energy and action,
and discuss the ramifications of our proposals.Comment: Under review at AGI-2015 conference. An early draft was submitted to
ALT-2014. This paper is now being split into two papers, one philosophical,
and one more technical. We intend that all installments of the paper series
will be on the arxi
VoG: Summarizing and Understanding Large Graphs
How can we succinctly describe a million-node graph with a few simple
sentences? How can we measure the "importance" of a set of discovered subgraphs
in a large graph? These are exactly the problems we focus on. Our main ideas
are to construct a "vocabulary" of subgraph-types that often occur in real
graphs (e.g., stars, cliques, chains), and from a set of subgraphs, find the
most succinct description of a graph in terms of this vocabulary. We measure
success in a well-founded way by means of the Minimum Description Length (MDL)
principle: a subgraph is included in the summary if it decreases the total
description length of the graph.
Our contributions are three-fold: (a) formulation: we provide a principled
encoding scheme to choose vocabulary subgraphs; (b) algorithm: we develop
\method, an efficient method to minimize the description cost, and (c)
applicability: we report experimental results on multi-million-edge real
graphs, including Flickr and the Notre Dame web graph.Comment: SIAM International Conference on Data Mining (SDM) 201
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