251,666 research outputs found
Why Reform Europe's Universities?
Based on a survey of European universities, this policy brief states that despite the good performance of some countries, Europe as a whole trails the US by a wide margin. The reason is two-fold. First, Europe invests too little in higher education. Second, European universities suffer from poor governance, insufficient autonomy and often perverse incentives. If Europe is to be a leader in the global knowledge economy, comprehensive reform of higher education is the order of the day. Most countries should invest an extra one percent in higher education each year, and universities should be given more autonomy in budgets, hiring and remuneration.
Why blame?
We provide experimental evidence that subjects blame others based on events they are not responsible for. In our experiment an agent chooses between a lottery and a safe asset; payment from the chosen option goes to a principal who then decides how much to allocate between
the agent and a third party. We observe widespread blame: regardless of their choice, agents are blamed by principals for the outcome of the lottery, an event they are not responsible for. We provide an explanation of this apparently irrational behavior with a delegated-expertise
principal-agent model, the subjects’ salient perturbation of the environment
Why Delannoy numbers?
This article is not a research paper, but a little note on the history of
combinatorics: We present here a tentative short biography of Henri Delannoy,
and a survey of his most notable works. This answers to the question raised in
the title, as these works are related to lattice paths enumeration, to the
so-called Delannoy numbers, and were the first general way to solve Ballot-like
problems. These numbers appear in probabilistic game theory, alignments of DNA
sequences, tiling problems, temporal representation models, analysis of
algorithms and combinatorial structures.Comment: Presented to the conference "Lattice Paths Combinatorics and Discrete
Distributions" (Athens, June 5-7, 2002) and to appear in the Journal of
Statistical Planning and Inference
Why Chromatic Imaging Matters
During the last two decades, the first generation of beam combiners at the
Very Large Telescope Interferometer has proved the importance of optical
interferometry for high-angular resolution astrophysical studies in the near-
and mid-infrared. With the advent of 4-beam combiners at the VLTI, the u-v
coverage per pointing increases significantly, providing an opportunity to use
reconstructed images as powerful scientific tools. Therefore, interferometric
imaging is already a key feature of the new generation of VLTI instruments, as
well as for other interferometric facilities like CHARA and JWST. It is thus
imperative to account for the current image reconstruction capabilities and
their expected evolutions in the coming years. Here, we present a general
overview of the current situation of optical interferometric image
reconstruction with a focus on new wavelength-dependent information,
highlighting its main advantages and limitations. As an Appendix we include
several cookbooks describing the usage and installation of several state-of-the
art image reconstruction packages. To illustrate the current capabilities of
the software available to the community, we recovered chromatic images, from
simulated MATISSE data, using the MCMC software SQUEEZE. With these images, we
aim at showing the importance of selecting good regularization functions and
their impact on the reconstruction.Comment: Accepted for publication in Experimental Astronomy as part of the
topical collection: Future of Optical-infrared Interferometry in Europ
Why Extension-Based Proofs Fail
We introduce extension-based proofs, a class of impossibility proofs that
includes valency arguments. They are modelled as an interaction between a
prover and a protocol. Using proofs based on combinatorial topology, it has
been shown that it is impossible to deterministically solve k-set agreement
among n > k > 1 processes in a wait-free manner in certain asynchronous models.
However, it was unknown whether proofs based on simpler techniques were
possible. We show that this impossibility result cannot be obtained for one of
these models by an extension-based proof and, hence, extension-based proofs are
limited in power.Comment: This version of the paper is for the NIS model. Previous versions of
the paper are for the NIIS mode
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