1,766 research outputs found
Speaking of Music and the Counterpoint of Copyright: Addressing Legal Concerns in Making Oral History Available to the Public
Oral history provides society with voices and memories of people and communities experiencing events of the past first-hand. Such history is created through interviews; an interview, however, like any other type of intellectual property—once in a fixed form—is subject to copyright law. In order to make oral history available to the public, it is critically important that individuals generating and acquiring oral history materials clearly understand relevant aspects of copyright law. The varied nature of how one may create, use, and acquire oral history materials can present new, surprising, and sometimes baffling legal scenarios that challenge the experience of even the most skilled curators.
This iBrief presents and discusses two real-world scenarios that raise various issues related to oral history and copyright law. These scenarios were encountered by curators at Yale University’s Oral History of American Music archive (OHAM), the preeminent organization dedicated to the collection and preservation of recorded memoirs of the creative musicians of our time. The legal concerns raised and discussed throughout this iBrief may be familiar to other stewards of oral history materials and will be worthwhile for all archivists and their counsel to consider when reviewing their practices and policies
Enumerating Colorings, Tensions and Flows in Cell Complexes
We study quasipolynomials enumerating proper colorings, nowhere-zero
tensions, and nowhere-zero flows in an arbitrary CW-complex , generalizing
the chromatic, tension and flow polynomials of a graph. Our colorings, tensions
and flows may be either modular (with values in for
some ) or integral (with values in ). We obtain
deletion-contraction recurrences and closed formulas for the chromatic, tension
and flow quasipolynomials, assuming certain unimodularity conditions. We use
geometric methods, specifically Ehrhart theory and inside-out polytopes, to
obtain reciprocity theorems for all of the aforementioned quasipolynomials,
giving combinatorial interpretations of their values at negative integers as
well as formulas for the numbers of acyclic and totally cyclic orientations of
.Comment: 28 pages, 3 figures. Final version, to appear in J. Combin. Theory
Series
Introduction to the papers of TWG21: Assessment in mathematics education
International audienc
Comparing and Integrating Constraint Programming and Temporal Planning for Quantum Circuit Compilation
Recently, the makespan-minimization problem of compiling a general class of quantum algorithms into near-term quantum processors has been introduced to the AI community. The research demonstrated that temporal planning is a strong solution approach for the studied class of quantum circuit compilation (QCC) problems. In this paper, we explore the use of methods from operations research, specifically constraint programming (CP), as an alternative and complementary approach to temporal planning. We also extend previous work by introducing two new problem variations that incorporate important characteristics identified by the quantum computing community. We apply temporal planning and CP to the baseline and extended QCC problems as both stand-alone and hybrid approaches. The hybrid method uses solutions found by temporal planning to warm-start CP, leveraging the ability of temporal planning to find satisficing solutions to problems with a high degree of task optionality, an area that CP typically struggles with. These solutions are then used to seed the CP formulation which significantly benefits from inferred bounds on planning horizon and task counts provided by the warm-start. Our extensive empirical evaluation indicates that while stand-alone CP is not competitive with temporal planning, except for the smallest problems, CP in a hybrid setting is beneficial for all temporal planners in all problem classes
Introduction to the papers of TWG21: Assessment in mathematics education
TWG21 met for the second time in Utrecht at CERME11 and in this conference we sought to continue
the work started at CERME10. The aim of the previous meeting was to ascertain where the interest
of our community is when thinking about assessment, and to maintain the focus firmly on
mathematics. At CERME11 we discussed 14 papers and 3 posters which helped defining such
interest. We noticed again a variety of focal points: from validation of large-scale assessment
instruments, to the affordances and drawbacks of online assessment – especially in the university
context - to the details of construction of individualised feedback. As in the previous meeting the
papers also presented a variety of methodologies: from large quantitative studies to more nuanced
qualitative investigations. Among the submissions we also received papers related to students’
perspectives and teachers’ perspectives on assessment. These themes were not prominent in the past
meeting of the group and we welcomed the new perspectives they brought. Finally, we decided to
group papers together that indicated the role that mathematics has in the assessment: this is to say
papers that focus on the specifics of mathematics, such as assessing proof
Automated classification metrics for energy modelling of residential buildings in the UK with open algorithms
Estimating residential building energy use across large spatial extents is vital for identifying and testing effective strategies to reduce carbon emissions and improve urban sustainability. This task is underpinned by the availability of accurate models of building stock from which appropriate parameters may be extracted. For example, the form of a building, such as whether it is detached, semi-detached, terraced etc and its shape may be used as part of a typology for defining its likely energy use. When these details are combined with information on building construction materials or glazing ratio, it can be used to infer the heat transfer characteristics of different properties. However, these data are not readily available for energy modelling or urban simulation. Although this is not a problem when the geographic scope corresponds to a small area and can be hand-collected, such manual approaches cannot be easily applied at the city or national scale. In this paper, we demonstrate an approach that can automatically extract this information at the city scale using off-the-shelf products supplied by a National Mapping Agency. We present two novel techniques to create this knowledge directly from input geometry. The first technique is used to identify built form based upon the physical relationships between buildings. The second technique is used to determine a more refined internal/external wall measurement and ratio. The second technique has greater metric accuracy and can also be used to address problems identified in extracting the built form. A case study is presented for the City of Nottingham in the United Kingdom using two data products provided by the Ordnance Survey of Great Britain (OSGB): MasterMap and AddressBase. This is followed by a discussion of a new categorisation approach for housing form for urban energy assessment
Integrated B1+ Mapping for Hyperpolarized 13C MRI in a Clinical Setup using Multi-Channel Receive Arrays
The Resolved Stellar Halo of NGC 253
We have obtained Magellan/IMACS and HST/ACS imaging data that resolve red
giant branch stars in the stellar halo of the starburst galaxy NGC 253. The HST
data cover a small area, and allow us to accurately interpret the ground-based
data, which cover 30% of the halo to a distance of 30 kpc, allowing us to make
detailed quantitative measurements of the global properties and structure of a
stellar halo outside of the Local Group. The geometry of the halo is
significantly flattened in the same sense as the disk, with a projected axis
ratio of b/a ~ 0.35 +/- 0.1. The total stellar mass of the halo is estimated to
be M_halo ~ 2.5 +/- 1.5 x 10^9 M_sun, or 6% of the total stellar mass of the
galaxy, and has a projected radial dependence that follows a power law of index
-2.8 +/- 0.6, corresponding to a three-dimensional power law index of ~ -4. The
total luminosity and profile shape that we measure for NGC 253 are somewhat
larger and steeper than the equivalent values for the Milky Way and M31, but
are well within the scatter of model predictions for the properties of stellar
halos built up in a cosmological context. Structure within the halo is seen at
a variety of scales: there is small kpc-scale density variation and a large
shelf-like feature near the middle of the field. The techniques that have been
developed will be essential for quantitatively comparing our upcoming larger
sample of observed stellar halos to models of halo formation.Comment: ApJ, in press. Version with full resolution figures available at
http://www.astro.lsa.umich.edu/~jbailin/papers/bailin_n253halo.pd
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