12,989 research outputs found
Jump-Diffusion Risk-Sensitive Asset Management I: Diffusion Factor Model
This paper considers a portfolio optimization problem in which asset prices
are represented by SDEs driven by Brownian motion and a Poisson random measure,
with drifts that are functions of an auxiliary diffusion factor process. The
criterion, following earlier work by Bielecki, Pliska, Nagai and others, is
risk-sensitive optimization (equivalent to maximizing the expected growth rate
subject to a constraint on variance.) By using a change of measure technique
introduced by Kuroda and Nagai we show that the problem reduces to solving a
certain stochastic control problem in the factor process, which has no jumps.
The main result of the paper is to show that the risk-sensitive jump diffusion
problem can be fully characterized in terms of a parabolic
Hamilton-Jacobi-Bellman PDE rather than a PIDE, and that this PDE admits a
classical C^{1,2} solution.Comment: 33 page
Raising standards in performance
Over the past few years, instrumental performance has been subject to considerable
research in this journal and elsewhere. A great deal of this research has concentrated on
the practice strategies and individual lessons, which most students undertake in preparing
as performers. Little has been done on raising standards of performance on a larger scale
within the context of a large music department. This article describes the outcomes of a
two-year programme undertaken with undergraduates at Barnsley College. It looks
speci®cally at the scope for curriculum changes over that period and the way the various
individual aspects of performance lessons are brought together through a weekly class
which focuses on the demands of a public performance and the strategies required to
prepare for that event
Escaping the \u3cem\u3eSporhase\u3c/em\u3e Maze: Protecting State Waters within the Commerce Clause
Eastern states, though they have enjoyed a history of relatively abundant water, increasingly face the need to conserve water, particularly to protect water-dependent ecosystems. At the same time, growing water demands, climate change, and an emerging water-oriented economy have intensified pressure for interstate water transfers. Thus, even traditionally wet states are seeking to protect or secure their water supplies. However, restrictions on water sales and exports risk running afoul of the Dormant Commerce Clause. This Article offers guidance for states, partciularly eastern states concerned with maintaining and improving water-dependent ecosystems, in seeking to restrict water exports while staying within the confines of the Dormant Commerce Clause
The homotopy fixed point spectra of profinite Galois extensions
Let E be a k-local profinite G-Galois extension of an E_infty-ring spectrum A
(in the sense of Rognes). We show that E may be regarded as producing a
discrete G-spectrum. Also, we prove that if E is a profaithful k-local
profinite extension which satisfies certain extra conditions, then the forward
direction of Rognes's Galois correspondence extends to the profinite setting.
We show the function spectrum F_A((E^hH)_k, (E^hK)_k) is equivalent to the
homotopy fixed point spectrum ((E[[G/H]])^hK)_k where H and K are closed
subgroups of G. Applications to Morava E-theory are given, including showing
that the homotopy fixed points defined by Devinatz and Hopkins for closed
subgroups of the extended Morava stabilizer group agree with those defined with
respect to a continuous action and in terms of the derived functor of fixed
points.Comment: 60 Page
Nanotechnology and cancer
The biological picture of cancer is rapidly advancing from models built from phenomenological descriptions to network models derived from systems biology, which can capture the evolving pathophysiology of the disease at the molecular level. The translation of this (still academic) picture into a clinically relevant framework can be enabling for the war on cancer, but it is a scientific and technological challenge. In this review, we discuss emerging in vitro diagnostic technologies and therapeutic approaches that are being developed to handle this challenge. Our discussion of in vitro diagnostics is guided by the theme of making large numbers of measurements accurately, sensitively, and at very low cost. We discuss diagnostic approaches based on microfluidics and nanotechnology. We then review the current state of the art of nanoparticle-based therapeutics that have reached the clinic. The goal of the presentation is to identify nanotherapeutic strategies that are designed to increase efficacy while simultaneously minimizing the toxic side effects commonly associated with cancer chemotherapies
Pathwise Stochastic Calculus with Local Times
We study a notion of local time for a continuous path, defined as a limit of
suitable discrete quantities along a general sequence of partitions of the time
interval. Our approach subsumes other existing definitions and agrees with the
usual (stochastic) local times a.s. for paths of a continuous semimartingale.
We establish pathwise version of the It\^o-Tanaka, change of variables and
change of time formulae. We provide equivalent conditions for existence of
pathwise local time. Finally, we study in detail how the limiting objects, the
quadratic variation and the local time, depend on the choice of partitions. In
particular, we show that an arbitrary given non-decreasing process can be
achieved a.s. by the pathwise quadratic variation of a standard Brownian motion
for a suitable sequence of (random) partitions; however, such degenerate
behavior is excluded when the partitions are constructed from stopping times.Comment: minor change
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