Articles
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09/01/2025--
09/01/2025
Finite-Sample Non-Parametric Bounds with an Application to the Causal Effect of Workforce Gender Diversity on Firm Performance
Classical Manski bounds identify average treatment effects under minimal
assumptions but, in finite samples, assume that latent conditional expectations
are bounded by the sample's own extrema or that the population extrema are
known a priori -- often untrue in firm-level data with heavy tails. We develop
a finite-sample, concentration-driven band (concATE) that replaces that
assumption with a Dvoretzky--Kiefer--Wolfowitz tail bound, combines it with
delta-method variance, and allocates size via Bonferroni. The band extends to a
group-sequential design that controls the family-wise error when the first
``significant'' diversity threshold is data-chosen. Applied to 945 listed firms
(2015 Q2--2022 Q1), concATE shows that senior-level gender diversity raises
Tobin's Q once representation exceeds approximately 30\% in growth sectors and
approximately 65\% in cyclical sectors.
Grace Lordan
Kaveh Salehzadeh Nobari
11/20/2003--
10/08/2003
On String Topology of Three Manifolds
Let $M$ be a closed, oriented and smooth manifold of dimension $d$. Let $\L
M$ be the space of smooth loops in $M$. Chas and Sullivan introduced loop
product, a product of degree $-d$ on the homology of $LM$. In this paper we
show how for three manifolds the ``nontriviality'' of the loop product relates
to the ``hyperbolicity'' of the underlying manifold. This is an application of
the existing powerful tool and results in three dimensional topology such as
the prime decomposition, torus decomposition, Seifert theorem, torus theorem.
Hossein Abbaspour
07/16/2001--
07/16/2001
Hamilton-Jacobi Formulation of KS Entropy for Classical and Quantum Dynamics
A Hamilton-Jacobi formulation of the Lyapunov spectrum and KS entropy is
developed. It is numerically efficient and reveals a close relation between the
KS invariant and the classical action. This formulation is extended to the
quantum domain using the Madelung-Bohm orbits associated with the Schroedinger
equation. The resulting quantum KS invariant for a given orbit equals the mean
decay rate of the probability density along the orbit, while its ensemble
average measures the mean growth rate of configuration-space information for
the quantum system.
M. Hossein Partovi
08/07/2009--
08/07/2009
Correlative Capacity of Composite Quantum States
We characterize the optimal correlative capacity of entangled, separable, and
classically correlated states. Introducing the notions of the infimum and
supremum within majorization theory, we construct the least disordered
separable state compatible with a set of marginals. The maximum separable
correlation information supportable by the marginals of a multi-qubit pure
state is shown to be an LOCC monotone. The least disordered composite of a pair
of qubits is found for the above classes, with classically correlated states
defined as diagonal in the product of marginal bases.
M. Hossein Partovi
04/05/2012--
04/05/2012
Entanglement Detection Using Majorization Uncertainty Bounds
Entanglement detection criteria are developed within the framework of the
majorization formulation of uncertainty. The primary results are two theorems
asserting linear and nonlinear separability criteria based on majorization
relations, the violation of which would imply entanglement. Corollaries to
these theorems yield infinite sets of scalar entanglement detection criteria
based on quasi-entropic measures of disorder. Examples are analyzed to probe
the efficacy of the derived criteria in detecting the entanglement of bipartite
Werner states. Characteristics of the majorization relation as a comparator of
disorder uniquely suited to information-theoretical applications are emphasized
throughout.
M. Hossein Partovi
07/12/2012--
07/12/2012
The Long Neglected Critically Leveraged Portfolio
We show that the efficient frontier for a portfolio in which short positions
precisely offset the long ones is composed of a pair of straight lines through
the origin of the risk-return plane. This unique but important case has been
overlooked because the original formulation of the mean-variance model by
Markowitz as well as all its subsequent elaborations have implicitly excluded
it by using portfolio weights rather than actual amounts allocated to
individual assets. We also elucidate the properties of portfolios where short
positions dominate the long ones, a case which has similarly been obscured by
the adoption of portfolio weights.
M. Hossein Partovi
07/14/2014--
07/14/2014
Automorphic forms for triangle groups: Integrality properties
We classify all primes appearing in the denominators of the Hauptmodul $J$
and modular forms for non-arithmetic triangle groups with a cusp. These primes
have a congruence condition in terms of the order of the generators of the
group. As a corollary we show that for the Hecke group of type $(2,m,\infty)$,
the prime $p$ does not appear in the denominator of $J$ if and only if $p\equiv
\pm 1\pmod m$.
Hossein Movasati
Khosro M. Shokri
01/29/2016--
01/29/2016
Weakly Mutually Uncorrelated Codes
We introduce the notion of weakly mutually uncorrelated (WMU) sequences,
motivated by applications in DNA-based storage systems and synchronization
protocols. WMU sequences are characterized by the property that no sufficiently
long suffix of one sequence is the prefix of the same or another sequence. In
addition, WMU sequences used in DNA-based storage systems are required to have
balanced compositions of symbols and to be at large mutual Hamming distance
from each other. We present a number of constructions for balanced,
error-correcting WMU codes using Dyck paths, Knuth's balancing principle,
prefix synchronized and cyclic codes.
S. M. Hossein Tabatabaei Yazdi
Han Mao Kiah
Olgica Milenkovic
08/21/2016--
08/21/2016
Invariances of the operator properties of frame multipliers under perturbations of frames and symbol
Let $\Phi$ and $\Psi$ be frames for $\cal H$ and let $M_{m,\Phi,\Psi}$ be a
frame multiplier with the symbol $m$. In this paper, we restrict our
investigation to show that the operator properties of $M_{m,\Phi,\Psi}$ are
stable under the perturbations of $\Phi$, $\Psi$ and $m$. Also, special
attention is devoted to the study of invertible frame multipliers. These
results are not only of interest in their own right, but also they pave the way
for obtaining some new results for Gabor multipliers which have been studied
mostly by Hans Georg Feichtinger and his coauthors in recent years.
Hossein Javanshiri
08/23/2021--
08/23/2021
Target Detection via Quantum Illumination: Range Equation
In this article, the basic principle of target detection based on Gaussian
state quantum illumination (QI) has introduced. The performance of such system
has compared with its classical counterpart, which employs the most classical
state of light, i.e., coherent state, to illuminate the target region. By
deriving the maximum range equation, we have demonstrated that the quantum
illumination based target detection system is especially advantageous at low
transmission powers, which make these systems suitable for short range
applications like biomedical imaging or covert detection schemes.
Hossein Allahverdi
M. H. Qamat
M. Nowshadi
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