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Svetozar Najman
Postdoctoral researcher || Multiscale simulations | Nanomaterials
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Svetozar Najman

Postdoctoral researcher || Multiscale simulations | Nanomaterials
Adaptable? Versatile? Hopefully, I guess. Thus far, I have been able to adapt and work in different environments, ranging from both experimental and theoretical laboratories to industrial settings. Apart from my country, I was fortunate to have had an opportunity to work in Greece and Taiwan. It allowed me to experience different cultures and, perhaps, gain a unique perspective on life. I enjoy running simulations, although it is quite challenging. Many times I feel out of my depth, however, managed to persevere so far, even publish results in scientific journals. Also, in recent years, I had an opportunity to write the code that runs on a supercomputer. Through some painstaking writing and debugging succeeded in running Monte Carlo simulations and extracting the properties of the 2D perovskite material.
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Research Center for Applied Sciences (RCAS), Academia Sinica, Taiwan
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National Tsing Hua University
Taipei, Taiwan

Professional Background

  • Current status
    Employed
    Open to opportunities
  • Profession
    Python Developer
    Chemical Engineer
    Machine Learning Engineer
  • Fields
    Material Science
    Nanotechnology
  • Work experience
    6-10 years (4-6 years relevant)
  • Management
    I've had experience in managing 1-5 people
  • Skills
    Python
    Molecular Dynamics
    Monte Carlo Simulation
    Density Functional Theory
    Metadynamics
    C#
    Cape-Open
    Process Engineering
    Chemical Engineering
    LAMMPS
    VASP
    Materials Science
    Materials Studio
    Linux
    Simulations
    Microfluidics
    COMSOL Multiphysics
    Team Management
    Mentorship
    Machine Learning
    Public Speaking Skills
    Academic Writing
    semiconductor physics
    Manufacturing Process
    Engineering
  • Languages
    English
    Professional
    Chinese
    Beginner
    German
    Intermediate
    French
    Beginner
    Serbian
    Native or Bilingual
  • Highest level of education
    Doctoral

Job search preferences

  • Desired job type
    Full-time
    Interested in working remotely
  • Desired positions
    Research And Development Engineer
  • Desired work locations
    Singapore
    Taiwan
  • Freelance
    Full-time freelancer

Work Experience

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Postdoctoral Researcher

Mar 2023 - Present
Taipei, Taiwan
• Developed hybrid Monte Carlo code in Python programming language leveraging LAMMPS for molecular dynamics runs and energy evaluations during every trial move in 2D Ruddlesden-Popper perovskite layer exchange simulation; - adapted the code to run both on the GPUs and CPUs, employing updated machine-learned interatomic potential based on the bispectrum descriptor, as implemented in the Spectral Neighbor Analysis Potential (SNAP), # results from the simulations were presented at the Materials Research Society (MRS) Conference in Singapore (05-2023) and International Conference on Molecular Simulation (ICMS) in Taipei, Taiwan (10-2023); • Performed on-the-fly Machine Learning Ab-initio Molecular Dynamics (ML-AIMD) simulations in Vienna Ab-initio Simulation Package (VASP) of lithium intercalation in anode material in Li-ion battery, - to explore the difference in capacity between different variations of anode material (in progress); * all calculations carried out on Taiwania I, II and III supercomputers; * National Science and Technology Council (NSTC) postdoctoral fellowship --- @ Computational Nanomaterials & Nanomechanics Lab
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Doctoral Candidate

Aug 2017 - Feb 2023
5 yrs 7 mos
Taipei, Taiwan
• Developed a Grand Canonical Monte Carlo (GCMC) 2D perovskite crystal growth simulation code in Python programming language, employing the machine-learned potential, leveraging PyLammps library as an interface to LAMMPS molecular simulation package for energy evaluations of the supercell structures during the trial moves; • Trained the machine-learning enabled potential for butylammonium (BA) based 2D perovskite material employing the Behler-Parrinello feed-forward neural network (FFNN) method based on the Gaussian descriptor as implemented in Atomistic Machine-learning Package (AMP); • Assembled a training set from ab-initio molecular dynamics trajectories (AIMD) including the most important inter-atomic contributions in 2D perovskite material as an input for the subsequent machine learning of the artificial neural network (ANN) force-field; • Carried out the surface structure of low-index facets in 2D Ruddlesden-Popper material from density functional theory (DFT) calculations, - extracted surface features revealed that low surface energies stem from hydrogen bond shortening increasing the strength of Coulomb interaction between organic cations and iodine atom; # results presented at the WCCM ECCOMAS Conference in Paris, France (01-2021); • DFT study of adsorption of small organic molecule on lead-free antimony-based all-inorganic perovskite, - calculations revealed noticeably stronger affinity of O atom within the N-methylpyrrolidone (NMP) molecule to Cs atom in all-inorganic Cs3Sb2I9 perovskite compared to S atom within thiourea (TU) leading to better morphology and increased stability of the active layer of the solar cell device; • Carried out large scale DFT study of intertwined defect in 2D layered Ruddlesden-Popper 2D perovskite material in VASP, - extracted the band structure and density of states (DOS) of the resulting trajectories reveal shallow defects and Fermi level pinning features in the material; * all calculations carried out on Taiwania I, II and III supercomputers; --- @ Computational Nanomaterials & Nanomechanics Lab
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Doctoral Researcher

Mar 2016 - Jul 2017
1 yr 5 mos
Taipei, Taiwan
• Carried out metadynamics simulations of methylammonium lead-iodide (MAPbI3) soft crystal using DL_POLY Classic molecular dynamics simulation software; - extracted the free energy surface (FES) and the energy barrier for crystal nucleation from amorphous phase at different temperatures; # results including the energy barriers and critical nuclei presented at the Association of Computational Mechanics Conference (ACMT) in Tainan, Taiwan (10-2017)}; • Carried out the Temperature Accelerated Dynamics (TAD) simulations of cation defect in MAPbI3 crystal in LAMMPS Molecular Dynamics Simulator, - results revealed different diffusion barrier and cation pathways with and without applied external electric field; • Molecular dynamics simulations of methylammonium lead-iodide (MAPbI3) soft crystal, performed in LAMMPS molecular dynamics simulation software - to test the phase stability and temperature limits of the MAPbI3 interatomic potential; * all simulations carried out on local cluster including 16 core and 12 core notes --- @ Computational Nanomaterials & Nanomechanics Lab
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Doctoral Researcher

Apr 2015 - Feb 2016
11 mos
Taipei City, Taiwan
• Commenced experiments to investigate cellular responses in hypoxic environment generated by spatially controlled chemical reactions within the PDMS-based microfluidic device; • Performed the simulation tests of the flow regime in the microfluidic device using COMSOL Multiphysics simulation package; • Fabricated PDMS-based microfluidic devices for hypoxia study; • Cell culture - passaging cells on daily basis; @ Lab for Integrated Biomedical Microdevices
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Doctoral Researcher

Oct 2014 - Apr 2015
7 mos
Taipei City, Taiwan
• Lab rotation @ Molecular and Material Modeling Lab [Institute of Atomic and Molecular Sciences] (02-2015 - 04-2015), - literature review of available classical H2O force-field models (TIP3P, TIP4P) to study phase transition in water from molecular dynamics simulations; • Lab rotation @ Polymer Physics and Complex Fluids Group [Institute of Physics] (09-2014 - 01-2015), - literature review of DNA in nanoconfinement from molecular dynamics simulations study, - literature review and project proposal for polymer-based solar cell active layer material study from molecular dynamics simulations;
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Software [Chemical] Engineer, Early stage researcher

Oct 2012 - Dec 2013
1 yr 3 mos
Thermi 570 01, Greece
• Developed a polystyrene CAPE-OPEN compliant batch reactor unit operation using C# programming language, - applied in CAPE-OPEN compliant chemical engineering process simulation packages (Aspen Plus, COCO Simulator); • Developed an interface to a polystyrene batch reactor using Visual Basic for Applications (VBA) and Excel as a front-end for parameter input, - presented as an intermediate working model to a chemical industry partner on the project; • Developed a beta version of a polystyrene batch reactor stand-alone application integrating both front-end in C#, and back-end in Fortran programming language using Microsoft Visual Studio, - facilitated a simulation of the batch reactor output based on the chosen input parameters; * Under the 'Multimod' [Multiscale modeling] project hosted by the Aristotle University of Thessaloniki, Marie Curie fellowship
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Process Engineer

May 2012 - Oct 2012
6 mos
Mala Plana, Serbia
• streamlined raw materials ratio, tunnel dryer and furnace mass/heat transfer calculations using SMath Studio (MathCAD equivalent), - to facilitate the choice of process parameters; • controlled the quality of raw materials and final product on a daily basis; • performed a measurement of a tunnel dryer, - for the subsequent software visualization and mathematical modelling;
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Biochemical analyst

Mar 2012 - May 2012
3 mos
Bulevar Dr Zorana Đinđića 48, Niš 18000, Serbia
• Blood serum analysis, Olympus blood analyzer operator, - handled the blood samples, classified obtained results;
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Computer Service Technician

Mar 2006 - Dec 2006
10 mos
Bulevar Dr Zorana Đinđića 48, Niš 18000, Serbia
• Desktop PC software and hardware maintenance, - OS, application install, troubleshooting computer hardware issues and repairs; • Desktop publishing, - PowerPoint presentations, book chapters for the faculty PIs;

Education

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Doctor of Philosophy (PhD)
Chemistry (1st Major) & Physics (2nd Major) @ Department of Engineering and System Science
2014 - 2023
Description
Thesis: - Structure and morphology of advanced stable perovskite material from multiscale molecular simulation (grade - A+) [thesis library link --> https://hdl.handle.net/11296/kv28r7] Mentorship: - Guided a student toward his master thesis. During our work on the project he successfully passed the interview and was hired for the position at Taiwan Semiconductor Manufacturing Corporation (TSMC). * Taiwan International Graduate Program (TIGP) fellowship - Nano Science and Technology Program (managed by the Institute of Physics (IoP), Academia Sinica) Courses: - Introduction to Nanotechnology - Advanced Nanotechnology - Advanced Physical Chemistry - Computational Materials Science - Solid State Physics
Other
Software Engineering
2009 - 2011
91.7/100 GPA
Description
Selected courses: - Windows Forms Technologies (C# programming) - SQL database management and programming - XML technologies and web services - Programming Office Applications
Master of Science (MS)
Chemical Engineering
2006 - 2011
Activities and societies
President of the Student Union in two consecutive terms.
Description
Thesis: - COCO simulator of steady-state processes (grade - 10/10) Selected courses: - Chemistry - Thermodynamics - Physical Chemistry - Mass Transfer - Heat Transfer - Numerical Mathematics - Mathematical Modelling in Chemical Engineering

Licenses & Certifications

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Udemy
Credential ID: UC-6e9ab0a9-d605-4ae2-8acd-c8a901bb2dd0
Issued Feb 2024
No Expiration Date
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Udemy
Credential ID: UC-7O7WLZNG
Issued Feb 2019
No Expiration Date
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Udemy
Issued Jan 2019
No Expiration Date
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Udemy
Issued Nov 2018
No Expiration Date
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Coursera
Credential ID: UMY37Y4PWK6C
Issued Feb 2018
No Expiration Date