Vahid S. Bokharaie

Vahid S. Bokharaie
Max Planck Institute for Biological Cybernetics | KYB · Division of Neurophysiology of Cognitive Processes

Ph.D.
Looking for a new challenge.

About

40
Publications
9,068
Reads
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474
Citations
Citations since 2016
23 Research Items
382 Citations
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2016201720182019202020212022020406080100120
2016201720182019202020212022020406080100120
Introduction
Control Engineer, Mathematician, Data Scientist. Have been busy mostly working on Systems Neuroscience in the past few years.
Additional affiliations
September 2016 - May 2021
Max Planck Institute for Biological Cybernetics
Position
  • Researcher
May 2016 - September 2016
Central Institute of Mental Health
Position
  • Researcher
March 2014 - March 2016
KU Leuven
Position
  • PostDoc Position
Description
  • My main area of research is on wind farm control. The aim is to maximise the power generation of a wind farm in the presence of different atmospheric conditions.

Publications

Publications (40)
Article
Full-text available
A Correction to this paper has been published: https://doi.org/10.1038/s41593-020-00779-0.
Article
Full-text available
This paper presents a method to predict the spread of the SARS-CoV-2 in a population with a known age-structure, and then, to quantify the effects of various containment policies, including those policies that affect each age-group differently. The model itself is a compartmental model in which each compartment is divided into a number of age-group...
Preprint
Full-text available
This paper presents a method to predict the spread of the SARS-CoV-2 in a population with a known age-structure, and then, to quantify the effects of various containment policies, including those policies that affect each age-group differently. The model itself is a compartmental model in which each compartment is divided into a number of age-group...
Preprint
Full-text available
This paper presents a method to predict the spread of the SARS-CoV-2 in a population with a known age-structure, and then, to quantify the effects of various containment policies, including those policies that affect each age-group differently. The model itself is a compartmental model in which each compartment is divided into a number of age-group...
Article
Full-text available
To understand the function of cortical circuits, it is necessary to catalog their cellular diversity. Past attempts to do so using anatomical, physiological or molecular features of cortical cells have not resulted in a unified taxonomy of neuronal or glial cell types, partly due to limited data. Single-cell transcriptomics is enabling, for the fir...
Article
Full-text available
A community-based transcriptomics classification and nomenclature of neocortical cell types To understand the function of cortical circuits, it is necessary to catalog their cellular diversity. Past attempts to do so using anatomical, physiological or molecular features of cortical cells have not resulted in a unified taxonomy of neuronal or glial...
Preprint
Full-text available
Calculations based on the data obtained from Princess Diamond cruise ship shows that depending on the age structure of a country, between approximately 24% and 34% of the individuals infected with SARS-CoV-2 virus would be asymptomatic, assuming that the mutations of the virus since February has not affected this ratio.
Preprint
Full-text available
In this manuscript, a method is presented that can be used to predict the spread of COVID-19 in any country and under any containment policy imposed separately on different groups in the population. The method tunes the parameters of a known stratified model based on the available data on the spread of COVID-19. The model includes a set of nonlinea...
Preprint
Full-text available
The SARS-Cov-2 virus is spreading fast all over the world and has already imposed a significant social and economic cost in many countries. Different countries have utilised a variety of containment policies with an emphasis on social distancing as a strategy to stop the spread of COVID-19. Quantifying the effects of such policies in different time...
Technical Report
Full-text available
(Update: Report now includes a discussion on long-term plans to manage, not necessarily eradicate, the spread of the virus. March 29, 2020) In this report, using a model adapted to real-world data of the spread of COVID-19, it is shown that if COVID-19 is spread in Iran without any containment policy, which is more or less the case at the moment of...
Preprint
Full-text available
The available data on the spread of COVID-19 in China has been used to estimate the parameters of epidemiological models in a population stratified based on age distribution. The models can then be adapted and used for other countries or populations with different age distributions. The resulting models can be used to calculate the trajectory of th...
Presentation
Full-text available
The slides show the potential and possibilities to analyse the effectiveness of containment strategies for COVID-19 virus. The draft of the original paper can be found here: http://people.tuebingen.mpg.de/vbokharaie/Estimating_Covid19_contact_rates.pdf
Article
Full-text available
Significance The duration of cerebral ischemia is a key factor in determining the severity of brain damage and the course of action. Thus, an accurate and timely observation of the ischemic process is highly critical. Here we present a molecular neuroimaging approach that enables direct detection and real-time visualization of transient cerebral is...
Preprint
Full-text available
To understand the function of cortical circuits it is necessary to classify their underlying cellular diversity. Traditional attempts based on comparing anatomical or physiological features of neurons and glia, while productive, have not resulted in a unified taxonomy of neural cell types. The recent development of single-cell transcriptomics has e...
Research
Full-text available
This is an open-source general-purpose fMRI Anlysis Tool written in Pyhton. It can be installed as a library in Python simply using: 'pip install mitfat'. And the working version of the code can be found in: <https://gitlab.tuebingen.mpg.de/vbokharaie/mitfat>. This code is used in the following publication: <https://www.pnas.org/content/116/41/2...
Article
Full-text available
Neuropsychiatric disorders are the third leading cause of global disease burden. Current pharmacological treatment for these disorders is inadequate, with often insufficient efficacy and undesirable side effects. One reason for this is that the links between molecular drug action and neurobehavioral drug effects are elusive. We use a big data appro...
Poster
Real-time monitoring of biological processes under physiological and pathological conditions is still a great challenge for magnetic resonance imaging (MRI), despite its extensive clinical applications. Calcium(II) is an ideal target for functional MRI purposes, as it is involved in immense number of signaling events in the brain as a secondary mes...
Article
Full-text available
Given a wind farm with known dimensions and number of wind turbines, we try to find the optimum positioning of wind turbines that maximises wind-farm energy production. In practice, given that optimisation has to be performed for many wind directions, and taking into account the yearly wind distribution, such an optimisation is computationally only...
Preprint
Full-text available
Given a wind-farm with known dimensions and number of wind-turbines, we try to find the optimum positioning of wind-turbines that maximises wind-farm energy production. In practise, given that optimisation has to be performed for many wind directions and taking into account the yearly wind distribution, such an optimisation is computationally only...
Article
Full-text available
We study the spread of disease in an SIS model for a structured population. The model considered is a time-varying, switched model, in which the parameters of the SIS model are subject to abrupt change. We show that the joint spectral radius can be used as a threshold parameter for this model in the spirit of the basic reproduction number for time-...
Conference Paper
Full-text available
This paper presents a stability analysis of power system stabilisers (PSS) for synchronous generators with inclusion of time delays. The paper shows that a time delay in the PSS feedback loop can improve the small-signal stability of a power system if the regulator gain is prop-erly tuned. The paper provides a proof-of-principle analy-sis based on...
Article
Full-text available
This paper presents a stability analysis of power system stabilisers (PSS) for synchronous generators with inclusion of time delays. The paper shows that a time delay in the PSS feedback loop can improve the small-signal stability of a power system if the regulator gain is properly tuned. The paper provides a proof-of-principle analysis based on th...
Article
Full-text available
In this manuscript, we present conditions for delay-independent stability of subhomogeneous cooperative time-delay systems. We consider the case where the time-delay system has a unique equilibrium at the origin and the case where it has a unique equilibrium in the interior of the positive orthant and prove global delay-independent stability result...
Article
Full-text available
We present a condition for delay-independent stability of a class of nonlinear positive systems. This result applies to systems that are not necessarily monotone and extends recent work on cooperative nonlinear systems.
Conference Paper
Full-text available
In this manuscript, we present conditions for delay-independent stability of subhomogeneous cooperative time-delay systems. We consider the case where the time-delay system has a unique equilibrium at the origin and the case where it has a unique equilibrium in the interior of the positive orthant and prove global delay-independent stability result...
Article
Full-text available
We study the spread of disease in an SIS model for a structured population. The model considered is a time-varying, switched model, in which the parameters of the SIS model are subject to abrupt change. We show that the joint spectral radius can be used as a threshold parameter for this model in the spirit of the basic reproduction number for time-...
Book
Full-text available
Although in recent years much attention has been paid to positive systems in general, there are still many areas that are left untouched. One of these areas, is the stability analysis of positive systems under any form of uncertainty. In this book, we study three broad classes of positive systems subject to different forms of uncertainty: nonlinear...
Article
Full-text available
Building on recent work on homogeneous cooperative systems, we extend results concerning stability of such systems to subhomogeneous systems. We also consider subhomogeneous cooperative systems with constant input, and relate the global asymptotic stability of the unforced system to the existence and stability of positive equilibria for the system...
Article
Full-text available
We correct some errors in the statements and proofs presented in Section V of the above mentioned manuscript.
Article
Full-text available
We introduce a nonlinear definition of D-stability, extending the usual concept for positive linear time-invariant systems. We show that globally asymptotically stable, cooperative systems, homogeneous of any order with respect to arbitrary dilation maps are D-stable. We also prove a strong stability result for delayed cooperative homogeneous syste...
Conference Paper
Full-text available
We consider SIS models for the spread of epi-demics. In particular we consider the so called nonhomogeneous case, in which the probability of infection and recovery are not uniform but depend on a neighborhood graph which describes the possibility of infection between individuals. In addition it is assumed, that infection, recovery probabilities as...
Conference Paper
Full-text available
We present a number of results on D-stability of positive switched systems. Different classes of linear and nonlinear positive switched systems are considered and simple conditions for D-stability of each class are presented.
Chapter
Full-text available
We consider a number of questions pertaining to the stability of positive switched linear systems. Recent results on common quadratic, diagonal, and copositive Lyapunov function existence are reviewed and their connection to the stability properties of switched positive linear systems is highlighted. We also generalise the concept of D-stability to...

Questions

Questions (4)
Question
I have the daunting task of explaining the concept of Eigenvalue to biologists and physicians with minimal mathematical background in a very short seminar. Any ideas on how to approach the task or introducing resources that might have already addressed that, is much appreciated.
Thanks!
Question
Hi all
My problem is as follows: I have measurements (obtained from simulations) of a stream of a fluid (air), which is disturbed by an obstacle (a wind turbine). Of course the flow can be described by solving Navier-Stokes equations, and that is what my simulation environment does, with huge computational cost.
My aim is to use system identification methods to predict the velocity at the wind turbines location, and also, at distance $x$ behind the wind turbine (a so-called wake model). I have measurements in $m$ points in fronts of wind turbine, each includes $N$ samples in time. I can consider these $m$ points as my system inputs, but they are not independent, velocity measured at point $k$ is a function of points ${k-1, k-2, ...}$. One solution I tired was to consider only one of these points, but it has not given me good results. And the other problem is the delay between these $m$ points and my target point is time-varying and depends on wind velocity itself, which adds another level of complexity to the problem. 
Any ideas or references on the subject is highly appreciated.
Thanks.
Question
Hi All
For some classes of PDEs, there are methods to approximate them using time-delay systems. Time-delay systems are not generally easy to analyse and control, but simpler compared to many PDEs. So, there have been successful efforts to approximate them using time-delay systems. And a colleague showed me his work in which they have used the method of characteristics to do that for Euler equations.
So, I am trying to find out if the same has been applied to Navier-Stokes equations with Reynolds numbers around 100. I am collaborating with some CFD experts on wind-farm control and I want to use this technique to come up with a simpler model to deal with, if possible.
If anybody has any ideas or knows any good references on the subject, I'd be grateful if you let me know. My search so far hasn't been really fruitful.
Thanks!
Question
I have started to work on designing controllers for blade pitch control of wind turbines. It seems there are not so many references on this subject and generally on wind turbine control available at the moment. So, if anybody could recommend any good references on the subject, I'd be grateful.

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Projects

Projects (5)
Project
Using mathematical models to study the spread of diseases in a population.
Project
Theoretical Work in the field of systems neuroscience.
Archived project
My work on windfarm optimisation and stability analysis of power systems.