Asst. Prof. Özkan DEĞER


Faculty of Science, Department of Mathematics

Analysis and Theory of Functions Division


WoS Research Areas: Natural Sciences (Sci), Mathematics, Mathematics Applied, History & Philosophy Of Science


Avesis Research Areas: Mathematics, General Mathematics, Real Functions, Convex and Discrete Geometry, Operators, Optimization, Numerical Analysis, Natural Sciences


Names in Publications: Deger O, Deger Oe

Email: ozdeger@istanbul.edu.tr
Office Phone: +90 212 455 5700 Extension: 15311
Fax Phone: +90 212 519 0834
Web: http://www.ozkandeger.org
Office: Fen Fakültesi Matematik Bölümü 4. Kat
Address: İstanbul Üniversitesi Fen Fakültesi Matematik Bölümü, 34134, Vezneciler, Fatih/İstanbul

Metrics

Publication

33

Publication (WoS)

6

Publication (Scopus)

9

Citation (WoS)

23

H-Index (WoS)

2

Citation (Scopus)

25

H-Index (Scopus)

2

Citation (Scholar)

34

H-Index (Scholar)

3

Citation (TrDizin)

1

H-Index (TrDizin)

1

Citation (Sum Other)

13

Total Citation Count

37

Project

6

Thesis Advisory

5

Open Access

1
UN Sustainable Development Goals

Education

2004 - 2009

2004 - 2009

Doctorate

Istanbul University, Institute of Graduate Studies In Sciences, Matematik, Turkey

1999 - 2002

1999 - 2002

Postgraduate

Istanbul University, Institute of Graduate Studies In Sciences, Matematik, Turkey

1993 - 1998

1993 - 1998

Undergraduate

Istanbul University, Faculty of Science, Matematik, Turkey

Dissertations

2009

2009

Doctorate

Polihedral Dahil Etmelerde Optimallik İçin Gerek ve Yeter Koşullar

Istanbul University, Faculty of Science, Matematik

2002

2002

Postgraduate

Diskret ve Diferansiyel Dahil Etmelerde Optimallik İçin Gerek ve Yeter Koşullar

Istanbul University, Faculty of Science, Matematik

Foreign Languages

B2 Upper Intermediate

B2 Upper Intermediate

English

Certificates, Courses and Trainings

2017

2017

İş Hukuku, İSG Kavramı, Sağlık ve Güvenlik İşaretleri, Yangın, Patlama, Parlama, Meslek Hastalıkları

Occupational Health and Safety

İstanbul Üniversitesi

2014

2014

Eğitimde Etkileşim ve Katılımın Güçlendirilmesi

Education Management and Planning

İstanbul Üniversitesi

2014

2014

Hedef Kitle Odaklı İçerik Editörlüğü

Other

İstanbul Üniversitesi

2012

2012

Bilimsel Dergilerin Gelişimi ve Web of Science Çalıştayı

Vocational Training

Mikro Bilgi Kayıt ve Dağıtım A.Ş.

Research Areas

Mathematics

General Mathematics

Real Functions

Convex and Discrete Geometry

Operators

Optimization

Numerical Analysis

Natural Sciences

Academic Positions

2018 - Present

2018 - Present

Assistant Professor

Istanbul University, Faculty of Science, Department of Mathematics

2010 - 2018

2010 - 2018

Assistant Professor

Istanbul University, Faculty of Science, Department of Mathematics

1998 - 2010

1998 - 2010

Research Assistant

Istanbul University, Faculty of Science, Department of Mathematics

Managerial Experience

2025 - Present

2025 - Present

Beyazıt Kampüs Koordinatörlüğü

Istanbul University, Rektörlük

2025 - Present

2025 - Present

Hizmet Alımlarında Kontrol Teşkilatı Komisyon Üyeliği

Istanbul University, Faculty of Science

2024 - Present

2024 - Present

İş Sağlığı ve Güvenliği Komisyon Üyeliği

Istanbul University, Faculty of Science

2020 - Present

2020 - Present

Internship Committee Member

Istanbul University, Faculty of Science, Department of Mathematics

2018 - Present

2018 - Present

İstanbul Üniversitesi Spor Birliği Kulübü Yönetim Kurulu Üyesi

Istanbul University, Rektörlük

2016 - Present

2016 - Present

Fen Fakültesi Matematik Kulübü Danışmanlığı

Istanbul University, Faculty of Science

2014 - Present

2014 - Present

Fen Fakültesi Spor Danışmanı

Istanbul University, Faculty of Science

2014 - Present

2014 - Present

Rectorate Commissioner

Istanbul University, Rektörlük

2022 - 2023

2022 - 2023

Fen Fak. Dekanlık Binası İlk Yardım Ekip Lideri

Istanbul University, Faculty of Science

2017 - 2018

2017 - 2018

Öğrenci Temsilcisi Seçimi Komisyonu Üyesi

Istanbul University, Faculty of Science, Department of Mathematics

2017 - 2018

2017 - 2018

Sivil Savunma Planı ve Acil Durum Eylem Planı kapsamında Edebiyat-Fen-Su Bilimleri Fakülteleri İtfaiye Servis Amir Yrd.

Istanbul University, Faculty of Science

2012 - 2018

2012 - 2018

Fen Fakültesi Matematik, Fizik ve Astronomi Dergisi Editör Yardımcılığı

Istanbul University, Faculty of Science

2016 - 2017

2016 - 2017

FEDEK Komisyon Üyesi

Istanbul University, Faculty of Science, Department of Mathematics

2011 - 2017

2011 - 2017

Matematik Lisans Müfredat Programı Komisyon Üyeliği

Istanbul University, Faculty of Science, Department of Mathematics

2011 - 2017

2011 - 2017

Matematik ABD Müfredat Programı Komisyon Üyeliği

Istanbul University, Institute of Graduate Studies In Sciences, Fen Fakültesi Bölümü

2010 - 2017

2010 - 2017

Fen Fakültesi Elektronik Yayın Düzenleme Grubu Üyeliği

Istanbul University, Faculty of Science

2010 - 2017

2010 - 2017

Deputy Head of Department

İstanbul Üniversitesi, Faculty of Science, Matematik

2013 - 2016

2013 - 2016

Program Coordinator

Istanbul University, Open and Dıstance Educatıon Faculty, Distance Education Programs

2010 - 2015

2010 - 2015

Fen Fakültesi tescilli eser binası röleve, restitüsyon, restorasyon projesi Denetleme Komisyonu Üyeliği

Istanbul University, Rektörlük

2011 - 2014

2011 - 2014

Faculty Board Member

Istanbul University, Faculty of Science

2012 - 2013

2012 - 2013

Mezuniyet Komisyonu Üyeliği

Istanbul University, Faculty of Science, Department of Mathematics

2011 - 2013

2011 - 2013

Dikey Geçiş Sınavı Ek Kontenjan İntibak Komisyonu Üyeliği

Istanbul University, Faculty of Science, Department of Mathematics

2007 - 2013

2007 - 2013

Fen Fakültesi İnternet Sitesi Yöneticisi

Istanbul University, Faculty of Science

2011 - 2012

2011 - 2012

Yatay Geçiş İntibak Komisyonu Üyeliği

Istanbul University, Faculty of Science, Department of Mathematics

2010 - 2011

2010 - 2011

Head of Department

Istanbul University, Faculty of Science, Department of Mathematics

2003 - 2009

2003 - 2009

Matematik Bölümü Araştırma Görevlisi Temsilcisi

Istanbul University, Faculty of Science, Department of Mathematics

2001 - 2009

2001 - 2009

Matematik Bölümü İnternet Sitesi Yöneticisi

Istanbul University, Faculty of Science, Department of Mathematics

Non Academic Experience

2023 - Present

2023 - Present

Genel Sekreter

Professional Association, Türk Matematik Derneği, Genel Sekreterlik, Genel Sekreter

2023 - Present

2023 - Present

Yönetim Kurulu Üyesi

Professional Association, Mathematical Society of South Eastern Europe, Yönetim Kurulu, Yönetim Kurulu Üyesi

2022 - Present

2022 - Present

Ulusal Matematik Sempozyumu Koordinatörlüğü

Professional Association, Türk Matematik Derneği, Yönetim Kurulu Üyeliği, Ulusal Matematik Sempozyumu Koordinatörlüğü

2013 - Present

2013 - Present

Web sitesi kurucu ve yöneticiliği

turkmath.org, Web sitesi kurucu ve yöneticiliği

2000 - 2002

2000 - 2002

Genel Sekreter Yardımcılığı

Professional Association, Türk Matematik Derneği, Genel Sekreter Yardımcılığı, Genel Sekreter Yardımcılığı

Courses

Postgraduate

Postgraduate

LaTeX ile Matematiksel Döküman Yazma

Sonlu Boyutlu Öklid Uzaylarında Konveks Analiz ve Optimizasyon

Undergraduate

Undergraduate

Matematik Tarihi II

Konveks Analize Giriş

Matematik Tarihi I

Temel Finans Matematiği (MAT)

Nümerik Analiz

Matematik Tarihi

Konveks Analize Giriş (İÖ)

Temel Finans Matematiği (AST)

Temel Finans Matematiği (AST-İÖ)

Temel Finans Matematiği (MAT-İÖ)

Nümerik Analiz (İÖ)

Matematik (MBG)

Matematik

Bilim Felsefesi

Bilim Felsefesi (İÖ)

Analiz III (Fizik)

Analiz II (AST-İÖ)

Analiz II (AST)

Analiz III (Fizik-İÖ)

Öğretmenlik Uygulaması

Analiz I (AST)

Analiz I (AST-İÖ)

Analiz II (MAT-İÖ)

Analiz II (MAT)

Analiz I (MAT-İÖ)

Analiz I (MAT)

Matematik I (Mühendislik Fak.)

Matematik II (Mühendislik Fak.)

Diferansiyel Denklemler I (AST-İÖ)

Öğretim Teknolojileri ve Materyal Tasarımı

Articles

All (11)
SCI-E, SSCI, AHCI (4)
SCI-E, SSCI, AHCI, ESCI (4)
Scopus (6)
TRDizin (3)
Other Publications (3)

Papers Presented at Peer-Reviewed Scientific Conferences

2025

2025

1. A Pursuit-Evasion Model with Time-Dependent Speed

DEĞER Ö.

9th International Conference of Mathematical Sciences, İstanbul, Turkey, 3 - 07 September 2025, (Summary Text)

2022

2022

2. Optimization of semilinear third-order delay-differential inclusions using the adjoint Mahmudov inclusion

Değer Ö., Mahmudov E., Mastaliyeva D. I.

6th International Conference of Mathematical Sciences, ICMS 2022, Hybrid, Istanbul, Turkey, 20 - 24 July 2022, vol.2879, no.1, (Full Text) identifier

2023

2023

3. Diyagonal Aşırı Dönüşsel Teoplitz Operatörleri

Eskişehirli B. B., Değer Ö.

35. Ulusal Matematik Sempozyumu, Edirne, Turkey, 4 - 08 September 2023, pp.30, (Summary Text)

2023

2023

4. Hypercyclic Toeplitz Operators on the Hilbert-Hardy Space in the Unit Disc

Kızılırmak B., Değer Ö., Eskişehirli B. B.

7th International Conference of Mathematical Sciences, İstanbul, Turkey, 5 - 09 July 2023, pp.28, (Summary Text)

2023

2023

5. A new disjoint hypercyclicity criterion

Eskişehirli B. B., Değer Ö.

7th International Conference of Mathematical Science ICMS 2023, İstanbul, Turkey, 5 - 09 July 2023, pp.26, (Summary Text)

2020

2020

6. A necessary condition for a mayer type set-valued optimization problem governed by a discrete inclusion system

Değer Ö.

4th International Conference of Mathematical Sciences, İstanbul, Turkey, 17 June 2020, vol.2334, no.1, pp.300061-300064, (Full Text) identifier identifier

2020

2020

7. A Necessary Condition for a Terminal Point Problem Governed by a Discrete Inclusion System

Değer Ö.

4th International Conference of Mathematical Sciences (ICMS 2020), İstanbul, Turkey, 17 - 21 June 2020, pp.38, (Summary Text)

2020

2020

8. On Optimal Solutions to a Generalized Heron Problem

Çebi E., Değer Ö.

4th International Conference of Mathematical Sciences, 17 - 21 June 2020, pp.30, (Summary Text)

2019

2019

9. A Minimization Algorithm for Limit Extremal Problems on Convex Compactum

Deger O.

3rd International Conference of Mathematical Sciences (ICMS), İstanbul, Turkey, 4 - 08 September 2019, vol.2183, (Full Text) identifier identifier

2018

2018

10. On Some Applications for Convex Set-Valued Mappings

Değer Ö.

2nd International Conference of Mathematical Sciences, İstanbul, Turkey, 31 July - 06 August 2018, pp.72, (Summary Text)

2009

2009

11. Optimal Control of The Elliptic Type Differential Inclusions with Dirichlet and Neumann Boundary Conditions

Mahmudov E., Değer Ö.

International Conference of Mathematical Sciences, İstanbul, Turkey, 1 - 04 August 2009, pp.151, (Summary Text)

2005

2005

12. Optimization Problem Described by Multivalued Mappings and Duality

Mahmudov E., Değer Ö.

The 1st International Conference on Control and Optimization with Industrial Applications, Baku, Azerbaijan, 1 - 04 May 2005, pp.65, (Summary Text)

Funded Projects

2024 - 2025

2024 - 2025

Bazı Optimal Kontrol Problemlerinde Çözümün Varlığı ve Optimallik Koşulları

TUBITAK Project , 1002 - Quick Support Program

Demir Sağlam S. (Executive), Değer Ö.

2018 - 2019

2018 - 2019

Optimization of Third Order Discrete and Differential Inclusions Described by Polyhedral Set-Valued Mappings

Project Supported by Higher Education Institutions , BAP Other

DEMİR SAĞLAM S. (Executive), MAHMUDOV E., DEĞER Ö.

2015 - 2017

2015 - 2017

Approximation and Optimization of Third Order Polyhedral Discrete And Differential Inclusions

Project Supported by Higher Education Institutions , BAP Research Project

DEĞER Ö. (Executive), DEMİR SAĞLAM S.

2012 - 2013

2012 - 2013

Optimal Control of Elliptic Differential Inclusions

Project Supported by Higher Education Institutions , BAP Other

DEĞER Ö. (Executive)

2011 - 2012

2011 - 2012

Sonlu Boyutlu Uzaylarda Matematik Programlama ve Dualite

Project Supported by Higher Education Institutions , BAP MSc

DEĞER Ö. (Executive)

Activities in Scientific Journals

2019 - Present

2019 - Present

OSMANLI BILIMI ARA?TIRMALARI

Publication Committee Member

2012 - 2018

2012 - 2018

İstanbul University. Science Faculty. The Journal of Mathematics, Physics and Astronomy

Assistant Editor/Section Editor

Memberships and Roles in Scientific Organizations

2024 - Present

2024 - Present

American Mathematical Society

Member

2023 - Present

2023 - Present

Turkish Mathematical Society

Secretary General

2023 - Present

2023 - Present

Mathematical Society of South Eastern Europe

Board Member

1999 - Present

1999 - Present

Türk Matematik Derneği

Member

2022 - 2023

2022 - 2023

Turkish Mathematical Society

Board Member

Peer Reviews in Scientific Publications

October 2025

October 2025

El-Cezeri Journal of Science and Engineering

National Scientific Refreed Journal

October 2025

October 2025

MATHSCINET

Other journals

August 2025

August 2025

MATHSCINET

Other journals

June 2025

June 2025

MATHSCINET

Other journals

March 2025

March 2025

MATHSCINET

Other journals

January 2025

January 2025

MATHSCINET

Other Journals

June 2024

June 2024

MATHSCINET

Other journals

January 2024

January 2024

OSMANLI BILIMI ARA?TIRMALARI

Other Indexed Journal

September 2023

September 2023

MATHSCINET

Other journals

June 2023

June 2023

MATHSCINET

Other journals

October 2022

October 2022

OSMANLI BILIMI ARA?TIRMALARI

Other Indexed Journal

September 2022

September 2022

MATHSCINET

Other journals

March 2021

March 2021

OSMANLI BILIMI ARA?TIRMALARI

Other Indexed Journal

July 2020

July 2020

OSMANLI BILIMI ARA?TIRMALARI

Other Indexed Journal

September 2019

September 2019

International journal of advances in engineering and pure sciences (Online)

National Scientific Refreed Journal

April 2019

April 2019

OSMANLI BILIMI ARA?TIRMALARI

Other Indexed Journal

March 2019

March 2019

SÜLEYMAN DEMIREL ÜNIVERSITESI FEN EDEBIYAT FAKÜLTESI FEN DERGISI = SÜLEYMAN DEMIREL UNIVERSITY FACULTY OF ARTS AND SCIENCE JOURNAL OF SCIENCE

National Scientific Refreed Journal

December 2018

December 2018

OSMANLI BILIMI ARA?TIRMALARI

Other Indexed Journal

October 2013

October 2013

İstanbul University Science Faculty Journal of Mathematics, Physics and Astronomy

Other Indexed Journal

Scientific Consultations

2016 - 2018

2016 - 2018

Scientific Consultancy

İstanbul İl Milli Eğitim Müdürlüğü

Istanbul University, Faculty of Science, Department of Mathematics, Turkey

Roles in Event Organizations

September 2025

September 2025

37. Ulusal Matematik Sempozyumu

Scientific Congress

Değer Ö., Bayrakçı Doğan S., Beyarslan Ö., Dil A., Işlak Ü., Kişisel A. U. Ö., et al.
Antalya, Turkey

May 2025

May 2025

11. Öğrenci Matematik Çalıştayı

Student Club and Community Activity

Değer Ö., Çali M. C., Aşkın E.
İstanbul, Turkey

September 2024

September 2024

36. Ulusal Matematik Sempozyumu

Scientific Congress

Değer Ö., Türkmen E., Yazıcı Yuret E. Ş., Demirci Y. M., Durğun Y., Kulak Ö., et al.
Amasya, Turkey

May 2024

May 2024

100. Yıl Öğrenci Matematik Çalıştayı X

Student Club and Community Activity

Değer Ö., Sezgin S.
İstanbul, Turkey

September 2023

September 2023

35. Ulusal Matematik Sempozyumu

Scientific Congress

Değer Ö., Öke F., Yazıcı Yuret E. Ş., Tekin P., Eysen A. E.
Edirne, Turkey

October 2022

October 2022

11. Bahar Matematik Buluşması

Student Club and Community Activity

Değer Ö., Altınkol İ.
Turkey

May 2022

May 2022

Öğrenci Matematik Çalıştayı VIII

Student Club and Community Activity

Değer Ö., Sezgin S.
İstanbul, Turkey

April 2021

April 2021

Öğrenci Matematik Çalıştayı VII

Student Club and Community Activity

Değer Ö., Ertan M.
İstanbul, Turkey

July 2019

July 2019

Journées Arithmétiques XXXI

Scientific Congress

Uludağ A. M., Kurşungöz K., Değer Ö., Boylan H., Bassa A., Zeytin A., et al.
İstanbul, Turkey

April 2019

April 2019

Öğrenci Matematik Çalıştayı V

Student Club and Community Activity

Değer Ö., İşcan S.
İstanbul, Turkey

April 2018

April 2018

Öğrenci Matematik Çalıştayı IV

Student Club and Community Activity

Değer Ö., Koyun A.
İstanbul, Turkey

April 2017

April 2017

Öğrenci Matematik Çalıştayı III

Student Club and Community Activity

Değer Ö., Koyun A.
İstanbul, Turkey

August 2009

August 2009

International Conference of Mathematical Sciences

Scientific Congress

Çakallı H., Çanak İ., Değer Ö.
İstanbul, Turkey


Congress and Symposium Activities

03 September 2025 - 07 September 2025

03 September 2025 - 07 September 2025

9th International Conference of Mathematical Sciences

Attendee

İstanbul-Turkey

01 September 2025 - 04 September 2025

01 September 2025 - 04 September 2025

37. Ulusal Matematik Sempozyumu

Session Moderator

Antalya-Turkey

09 September 2024 - 12 September 2024

09 September 2024 - 12 September 2024

36. Ulusal Matematik Sempozyumu

Session Moderator

Amasya-Turkey

04 September 2023 - 08 September 2023

04 September 2023 - 08 September 2023

35. Ulusal Matematik Sempozyumu

Session Moderator

Edirne-Turkey

04 September 2023 - 08 September 2023

04 September 2023 - 08 September 2023

35. Ulusal Matematik Sempozyumu

Attendee

Edirne-Turkey

05 July 2023 - 09 July 2023

05 July 2023 - 09 July 2023

7th International Conference of Mathematical Sciences

Attendee

İstanbul-Turkey

05 July 2023 - 09 July 2023

05 July 2023 - 09 July 2023

7th International Conference of Mathematical Sciences

Attendee

İstanbul-Turkey

20 July 2022 - 24 July 2022

20 July 2022 - 24 July 2022

6th International Conference of Mathematical Sciences

Attendee

İstanbul-Turkey

17 June 2020 - 21 June 2020

17 June 2020 - 21 June 2020

4th International Conference of Mathematical Sciences

Attendee

İstanbul-Turkey

19 November 2019 - 19 November 2019

19 November 2019 - 19 November 2019

Beşiktaş İlçe Milli Eğitim Müdürlüğü I. Zümreler Çalıştayı

Session Moderator

İstanbul-Turkey

04 September 2019 - 08 September 2019

04 September 2019 - 08 September 2019

3nd International Conference of Mathematical Sciences

Attendee

İstanbul-Turkey

31 July 2018 - 06 August 2018

31 July 2018 - 06 August 2018

2nd International Conference of Mathematical Sciences

Attendee

İstanbul-Turkey

29 April 2016 - 29 April 2016

29 April 2016 - 29 April 2016

Öğrenci Matematik Çalıştayı II

Panelists

İstanbul-Turkey

04 August 2009 - 10 August 2009

04 August 2009 - 10 August 2009

International Conference of Mathematical Sciences

Attendee

İstanbul-Turkey

22 May 2005 - 25 May 2005

22 May 2005 - 25 May 2005

The 1st International Conference on Control and Optimization with Industrial Applications

Attendee

Baku-Azerbaijan

Citations

Total Citations (WOS): 10

h-index (WOS): 2

Jury Memberships

June-2024

June 2024

Post Graduate

Büşra Kızılırmak Tez Savunması - İstanbul Üniversitesi

June-2022

June 2022

Post Graduate

Esra Çebi Tez Savunması - İstanbul Üniversitesi

June-2022

June 2022

Post Graduate

Büşra Akgün Tez Savunması - İstanbul Üniversitesi

July-2019

July 2019

Post Graduate

Şükran Keskin Tez Savunması - İstanbul Üniversitesi

July-2018

July 2018

Doctorate

Hüsamettin Çapan Tez Savunması - İstanbul Üniversitesi

June-2018

June 2018

Doctorate

Ali Uğur Sazaklıoğlu Tez Savunması - İstanbul Üniversitesi

April-2017

April 2017

Doctorate

Sevilay Demir Sağlam Tez Savunma - İstanbul Üniversitesi

June-2016

June 2016

Post Graduate

Gülşah Bozcu Tez Savunması - İstanbul Üniversitesi

September-2015

September 2015

Post Graduate

Mutlu Avcı Tez Savunması - İstanbul Üniversitesi

June-2014

June 2014

Post Graduate

Burcu Çınarcı Tez Savunması - İstanbul Üniversitesi

December-2011

December 2011

Post Graduate

Sevilay Demir Tez Savunması - İstanbul Üniversitesi

June-2011

June 2011

Post Graduate

Beyaz Başak Koca Tez Savunması - İstanbul Üniversitesi

June-2011

June 2011

Post Graduate

Bahar Kırık Tez Savunması - İstanbul Üniversitesi

June-2011

June 2011

Post Graduate

Sultan Bozkurt Tez Savunması - İstanbul Üniversitesi