*Last updated: 13 September 2022*

**Publication**

**Journal Paper**

- K. Sriamorn, S. Sriswasdi and S. Chaidee.
*The Non-Existence of Convex Configuration for a Given Set of Radii in Two-Dimensional Space.*Accepted to Carpathian Journal of Mathematics - K. Chaichana, A. Kitro, S. Chaidee and T. Rojsiraphisal (2021),
*The potential effects of temperature on outpatient visits: a case study in Chiang Mai, Thailand*, Environmental Science and Pollution Research (2020IF 4.223) [DOI:10.1007/s11356-021-15512-y] - (2021),
*A Voronoi-based method for land-use optimization using semidefinite programming and gradient descent algorithm*, International Journal of Geographical Information Science, 35:5, 999-1031 (2019IF 3.733 ) [DOI: 10.1080/13658816.2020.1841203] - S. Chaidee and K. Sugihara (2020),
*The Existence of a Convex Polyhedron with Respect to the Constrained Vertex Norms*. Mathematics 2020, 8, 645. (2018IF 1.105) [DOI:10.3390/math8040645] - S. Chaidee and K. Sugihara (2020),
*Laguerre Voronoi Diagram as a Model for Generating the Tessellation Patterns on the Sphere*, Graphs and Combinatorics,**36**, pp 371–385 (2018IF 0.481) [DOI:10.1007/s00373-019-02006-5] - S. Chaidee and K. Sugihara (2018),
*Spherical Laguerre Voronoi Diagram Approximation to Tessellations without Generators*, Graphical Models 95, pp. 1 – 13 - S. Chaidee and W. Wichiramala (2016),
*Optimal Partitioning of a Square : Numerical Approach*, ScienceAsia 42:2, pp. 150 – 157 (2016IF 0.343) [DOI 10.2306/scienceasia1513-1874.2016.42.150] - S. Chaidee and K. Sugihara (2015),
*Numerical Fitting of Planar Photographic Image with Spherical Voronoi Diagrams*, Computer Aided Drafting, Design and Manufacturing (CADDM) 25:4, pp. 26-31. [This paper is invited paper from AFGS conference.] - S. Chaidee and K. Sugihara (2017),
*Approximation of Fruit Skin Patterns Using Spherical Voronoi Diagram*, Pattern Analysis and Applications, 20:3, pp. 783–795 (2016IF 1.352) [DOI 10.1007/s10044-016-0534-2]

**Reviewed Proceeding (International Conference)**

- C. Sawatdithep and S. Chaidee (2023).
*Recognition of Archimedean Spiral Voronoi Diagrams from Linear Parastichies*. L.-Y. Cheng (Ed.): ICGG 2022, LNDECT 146, pp. 441–453, Springer, 2023. [DOI:10.1007/978-3-031-13588-0_38] - S. Chaidee, P. Pakawanwong, V. Suppakitpaisarn, P. Teerasawat (2017),
*Interactive Land-Use Optimization Using Laguerre Voronoi Diagram with Dynamic Generating Point Allocation,*The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Volume XLII-2/W7, 2017 (ISPRS Geospatial Week 2017), pp. 1091-1098. [DOI:10.5194/isprs-archives-XLII-2-W7-1091-2017] - S. Chaidee and K. Sugihara (2016),
*Fitting Spherical Laguerre Voronoi Diagrams to Real World Tessellations Using Planar Photographic Images*, J. Akiyama et al. (eds.): Discrete and Computational Geometry and Graphs (LNCS 9943), Springer, 2016, pp. 73-84. [DOI:10.1007/978-3-319-48532-4_7] - S. Chaidee and K. Sugihara (2015),
*Numerical Fitting of Planar Photographic Image with Spherical Voronoi Diagrams*, In Proc. of*the 10th Asian Forum on Graphic Science (2015).*

**Reviewed Proceeding (Domestic Conference)**

- W. Chaipunya and S. Chaidee.
*Development of the Mastery Learning Self-study Package on Geometry for Upper Secondary Students by Comparing Classical and Analytical Geometry Concepts.*In Proc.*of the Thailand 26th Annual Meeting in Mathematics*(2022), 397-411. (in Thai language) - S. Chaidee and W. Wichiramala (2013),
, In Proc.*Numerical Approach to the Optimal Partitioning of a Square Problem**of the Thailand 18th Annual Meeting in Mathematics*(2013), 199-206.

**Papers in Processes
**

**In preparation**

- S. Chaidee, P. Inkaew, S. Angkurawaranon, T. Mekhee. Evaluation of Shape and Volume for CT Scan Images
- N. Rintaew, S. Chaidee.
*Squares in Trapezoids* - S. Chaidee and Y. Chao.
*Convex Decomposition Arising from Geometric Triangulation*

**Preprints**

- S. Chaidee and K. Sugihara,
*Recognition of Spherical Laguerre Voronoi Diagram*Arxiv

**Proceedings (Book of Abstracts)**

- S. Chaidee, P. Homsombat and P. Jaima. A Family of Convex Polyhedra Generated by Regular Polylinks. In Proc.
*of The 24th Japan Conference on Discrete and Computational Geometry, Graphs, and Games (JCDCGGG 2022)*, pages 21-22, 2022. Here - N. Rintaew and S. Chaidee.
*The Conditions for Fitting a Square in a Trapezoid**,*In Proc.*of The 23rd Thailand-Japan Conference on Discrete and Computational Geometry, Graphs, and Games (TJCDCGGG 2020+1)*, pages 90-91, 2021. Here - K. Sriamorn, S. Sriswasdi and S. Chaidee.
*The Non-Existence of Convex Configuration for a Given Set of Radii in Two-Dimensional Space**,*In Proc.*of The 22nd Japan Conference on Discrete and Computational Geometry, Graphs, and Games (JCDCGGG’19)*, pages 113-114, 2019. Here - S. Chaidee, S. Nishida and N. Phetmak,
*Geometrical Analysis of Crane Game in Two Dimensions,*In Proc.*of The 21st Japan Conference on Discrete and Computational Geometry, Graphs, and Games (JCDCGGG’18)*, pages 43-45, 2018. Here - S. Chaidee and K. Sugihara,
*Laguerre Voronoi Diagram as a Model for Generating the Tessellation Patterns on the Sphere*, In Proc.*of The 20th Japan Conference on Discrete and Computational Geometry, Graphs, and Games (JCDCGGG’17)*, pages 33-34, 2017. Here - S. Chaidee and K. Sugihara,
*Recognition of the Spherical Laguerre Voronoi Diagram*, In*Computational Geometry Week 2016: Young Researcher Forum*, pages 5-6, 2016. Here - S. Chaidee and K. Sugihara,
*Laguerre Voronoi Diagram as a Tool for Fitting Spherical Tessellations Using Planar Photographic Images*, In Proc.*of The 19th Japan Conference on Discrete and Computational Geometry, Graphs, and Games (JCDCGGG’16)*, pages 60-61, 2016. Here - S. Chaidee and K. Sugihara,
*Approximation of a Spherical Tessellation by the Laguerre Voronoi Diagram*, In Proc.*of the 32th European Workshop on Computational Geometry (EuroCG’16)*, page 143 – 146, 2016. Here - S. Chaidee and K. Sugihara.
*Fitting spherical Laguerre Voronoi diagrams to real world tessellations using planar photographic images*. In Proc.*of the 18th Japan Conference on Discrete, Computational Geometry, and Graphs (JCDCGG’15)*, pages 40-41, 2015 - S. Chaidee and K. Sugihara,
*A Method for Fitting Real World Tessellations with Voronoi Diagrams*, In Proc.*of the 31th European Workshop on Computational Geometry (EuroCG’15)*, page 192 – 195, 2015. Here - S. Chaidee and K. Sugihara.
*Comparison between curved-surface tessellations and the Voronoi diagrams using planar photographic images*. In Proc.*of the 17th Japan Conference on Discrete*, pages 11-12, 2014*, Computational Geometry, and Graphs*(JCDCGG’14) - S. Chaidee and W. Wichiramala.
*Optimal Partitioning of a Square Problem: Numerical Approach*. In Proc.*of the 16th Japan Conference on Discrete and Computational Geometry**(JCDCGG’13)*, pages 58-59, 2013. Here

**Presentation**

**International Conferences (Oral Presentation)\**

- September 9-11, 2022
*The 24th Japan Conference on Discrete and Computational Geometry , Graphs, and Games (JCDCGGG 2022)*- Topic: A Family of Convex Polyhedra generated by Regular Polylinks
- Held by: Tokyo University of Science, Japan

- September 3-5, 2021
*The 23rd Thailand-Japan Conference on Discrete and Computational Geometry , Graphs, and Games (TJCDCGGG 2020+1)*- Topic: The Conditions for Fitting a Square in a Trapezoid
- Held by: Chiang Mai University, Thailand

- September 6-8, 2019
*The 22nd Japan Conference on Discrete and Computational Geometry , Graphs, and Games (JCDCGGG 2019)*- Topic: The Non-Existence of Convex Configuration for a Given Set of Radii in Two-Dimensional Space
- Held by: Tokyo University of Science, Japan

- September 1-3, 2018
*The 21st Japan Conference on Discrete and Computational Geometry , Graphs, and Games (JCDCGGG 2018)*- Topic: Geometrical Analysis of Crane Game in Two Dimensions
- Held by: Ateneo de Manila University, Manila, Phillipines

- September 21 – September 22, 2017
*Third International Conference on Spatial Data Mining and Geographical Knowledge Services, as a part of Geospatial Week 2017*- Topic: Interactive Land-Use Optimization Using Laguerre Voronoi Diagram with Dynamic Generating Point Allocation
- Held at: Wuhan East Lake International Conference Center, Wuhan, China
- Organized by: ISPRS and Wuhun University, China

- August 29 – September 1, 2017
*The 20th Japan Conference on Discrete and Computational Geometry , Graphs, and Games (JCDCGGG 2017)*- Topic: Laguerre Voronoi Diagram as a Model for Generating the Tessellation Patterns on the Sphere
- Held by: Tokyo University of Science, Japan

- June 14 – 18, 2016
*The Computational Geometry Week (CG Week 2016), with the 32nd International Symposium on Computational Geometry (SoCG 2016)*- Young Researcher Forum session
- Topic: Recognition of the Spherical Laguerre Voronoi Diagram
- Held at: Tufts University, Boston, USA
- Organized by CG Committee

- March 30 – April 1, 2016
*The 32st European Workshop in Computational Geometry (EuroCG 2015)*- Topic: Approximation of a Spherical Tessellation by the Laguerre Voronoi Diagram
- Held at: University of Lugano (USI), Switzerland
- Organized by EuroCG Committee

- September 14 – 16, 2015
*The 18th Japan Conference on Discrete and Computational Geometry and Graphs (JCDCGG 2015)*- Topic: Fitting Spherical Laguerre Voronoi Diagrams to Real World Tessellations Using Planar Photographic Images
- Held at: Clock Tower Centennial Hall, Kyoto University, Kyoto, Japan
- Organized by JCDCGG Committee

- August 4 – 7, 2015
*The 10th Asian Forum in Graphic Science (AFGS 2015)*- Topic: Numerical Fitting of Planar Photographic Image with Spherical Voronoi Diagrams
- Held at: Chatrium Hotel, Bangkok, Thailand
- Hosted by: King Mongkut’s University of Technology Thonburi, Thailand, in cooperate with JSGS, CGS, ISGG

- March 15 – 18, 2015
*The 31st European Workshop in Computational Geometry (EuroCG 2015)*- Topic: A Method for Fitting Real World Tessellations with Voronoi Diagrams
- Held at: University of Ljubljana, Slovenia
- Organized by EuroCG Committee

- September 17 – 19, 2013
*The 16th Japan Conference on Discrete and Computational Geometry and Graphs (JCDCGG 2013)*- Topic: Optimal Partitioning of a Square Problem: Numerical Approach
- Held at: Tokyo University of Science, Japan
- Organized by JCDCGG Committee

**Poster Presentation**

- November 9-12, 2016
*International Conference on Mathematical Modeling and Applications 2016 ‘Origami-Based Modeling and Analysis’*- Topic: Fitting the Real World Tessellations by the Spherical Laguerre Voronoi Diagram Using Planar Photographic Images
- Held at:Meiji University, Tokyo, Japan
- Hosted by:Meiji Institute for Advanced Study of Mathematical Sciences, Meiji University, Japan

- August 4-8, 2016 The 17th International Conference on Geometry and Graphics (ICGG2016)
- Topic: Fitting the Real World Tessellations by the Spherical Laguerre Voronoi Diagram Using Planar Photographic Images
- Held at: Beijing Institute of Technology, Beijing, China
- Hosted by: The International Society for Geometry and Graphics (ISGG)

- November 14, 2015 Thai-Japan Integrated Annual Educational Talk (TJIA E-Talk)
- Topic: On the Design Application Based on the Polygonal Patterns of the Fruit Skin Patterns
- Collaborative work with Pat Teerasawat, I-AUD, Graduate School of Science and Technology, Meiji University
- Held at: Kyoto Institute of Technology, Kyoto, Japan
- Hosted by: Thai Students Association in Japan under the Royal Patronage (TSAJ)

- October 26 – 29, 2015
*International Conference on Mathematical Modeling and Applications 2015 (ICMMA2015)**‘Self-Organization-Modeling and Analysis’*- Topic: Fitting Spherical Voronoi Diagram and Spherical Laguerre Voronoi Diagram to Real World Tessellations Using Planar Photographic Images
- Held at: Meiji University, Tokyo, Japan
- Hosted by: Meiji Institute for Advanced Study of Mathematical Sciences, Meiji University, Japan

- August 4 – 7, 2015
*The 10th Asian Forum in Graphic Science (AFGS 2015)* - March 18 – 19, 2011
*The 6th Conference on Science and Technology for Youths*, BITEC, Thailand- Topic: On the Convergence of 2-step and 3-step Iterations on Banach Spaces
- Held by: The Institute for the Promotion of Teaching Science and Technology (IPST), Thailand

- February 2, 2011
*Science Student Academic Presentation*, Faculty of Science, Chiang Mai University, Thailand- Topic: On the Convergence of 2-step and 3-step Iterations on Banach Spaces
- Held by: Faculty of Science, Chiang Mai University, Thailand

**Domestic Conferences**

- June 2 – 4, 2017
*The 22nd Annual Meeting in Mathematics (AMM)*, Chaing Mai, Thailand- Topic: Inverse Voronoi Diagram Problem for Analyzing Tessellation Patterns in Real World
- Held by: Chiang Mai University and Center for Promotion of Mathematical of Thailand, Thailand

- September 2 – 4, 2016
*The 19th Japan Conference on Discrete and Computational Geometry , Graphs, and Games (JCDCGGG 2016)*- Topic: Laguerre Voronoi Diagram as a Tool for Fitting Spherical Tessellations Using Planar Photographic Images
- Held by: Tokyo University of Science, Japan

- September 15 – 16, 2014
*The 17th Japan Conference on Discrete and Computational Geometry and Graphs (JCDCGG 2014)*- Topic: Comparison between Curved-Surface Tessellations and the Voronoi Diagrams Using Planar Photographic Images
- Held by: Tokyo University of Science, Japan

- May 9 – 10, 2013
*2013 Annual Pure and Applied Mathematics Conference (APAM)*, Bangkok, Thailand- Topic: Numerical Approach to the Optimal Partitioning of a Square Problem
- Held by: Chulalongkorn University

- March 14 – 16, 2013
*18th Annual Meeting in Mathematics (AMM)*, Krabi, Thailand- Topic: Numerical Approach to the Optimal Partitioning of a Square Problem
- Held by: Thaksin University and Center for Promotion of Mathematical of Thailand, Thailand

**Academic Meetings (Oral Presentation)**

- March 9 – 12, 2017
*The 8th Taiwan-Japan Joint Workshop for Young Scholars in Applied Mathematics*- Topic: Voronoi-based Model for Generating the Tessellation Patterns of the Fruit Skins
- Held by: Hiroshima Univerity, Japan (Committee from all cooperate universities)

- October 29, 2016
*The 8th Thailand-Japan International Academic Conference (TJIA2016)*- Topic: Spatial Optimization : Where Mathematics, Computer Science and Architecture Come Together
- Collaborative work with Prompong Pakawanwong, Vorapong Suppakitpaisan, Graduate School of Informtion Science and Technology, and Pat Teerasawat, I-AUD, Graduate School of Science and Technology, Meiji University
- Held at: Tokyo Institute of Technology, Japan
- Hosted by:Thai Students Association in Japan under the Royal Patronage (TSAJ)

- August 30 – 31, 2016
*The 9th Joint Session with Hiroshima University and Ryukoku University (*第9回 広島—明治—龍谷合同合宿:*Hiroshima Research Boot Camp)*- Topic: 球面ラゲールボロノイ図と自然の模様
- Held by: Hiroshima University, Japan

- February 27 – 29, 2016
*The 7th Taiwan-Japan Joint Workshop for Young Scholars in Applied Mathematics*- Topic: A Method for Spherical Laguerre Voronoi Diagram Approximation of a Spherical Tessellation
- Held by: National Cheng Kung University, Taiwan(Committee from all cooperate universities)

- February 27 – March 1, 2015
*The 6th Taiwan-Japan Joint Workshop for Young Scholars in Applied Mathematics*- Topic: A method for fitting Jackfruit skin patterns with Voronoi diagrams
- Held by: Meiji University, Japan (Committee from all cooperate universities)

- September 1 – 2, 2014
*The 7th Joint Session with Hiroshima University and Ryukoku University*第7回 広島—明治—龍谷合同合宿*(**: Hiroshima Research Boot Camp)*- Topic: Geometrical Analysis of the Fruit Surfaces
- Held by: Hiroshima University, Japan

- January 8 – 10, 2014
*The 9th Mathematics and Physical Sciences Graduate Congress (9th MPSGC)*- Topic: Optimal Partitioning of a Square Problem: Numerical Approach
- Held by: University of Malaya, Malaysia

- March 21 – 23, 2013
*The 8th Conference on Science and Technology for Youths,*BITEC, Thailand- Topic: Numerical Approach to the Optimal Partitioning of a Square Problem
- Held by: The Institute for the Promotion of Teaching Science and Technology (IPST), Thailand

- March 18 – 19, 2011
*The 6th Conference on Science and Technology for Youths*, BITEC, Thailand- Topic: On the Convergence of 2-step and 3-step Iterations on Banach Spaces
- Held by: The Institute for the Promotion of Teaching Science and Technology (IPST), Thailand

**Short Visiting for Research Activities**

- 2022 May – June (22 days): Toyo University, Saitama, Japan
- 2019 June-July (11 days): Sun Yat-Sen University, Guangzhou, China
- 2019 March (9 days): Sun Yat-Sen University, Guangzhou, China
- 2018 July – September:
*Visiting Scholar*at Meiji Institute for Advanced Study of Mathematical Sciences (MIMS), Meiji University, Tokyo, Japan, under the FYI2018 Follow-up Research Fellowship by JASSO

### Invited Talks / Seminars

- October 7, 2019, RIMS Cooperative Research : Quasiperiodic tiling and related topics (Kyoto University, Japan)
- Topic : Spherical Laguerre Voronoi diagram: geometrical properties toward applications

- March 11, 2019, Guangzhou Discrete Mathematics Seminar (Sun Yat-Sen University, Guangzhou, China)
- August 24-25, 2018, MIMS 現象数理学研究拠点共同研究集会: 幾何的解析と形状表現の数理
- June 6, 2016, MIMS Cafe Seminar
- October 21, 2015 MIMS Cafe Seminar
- October 7, 2015 Seminar of Imai’s Laboratory (University of Tokyo)
- Topic : Mathematical Modeling and Analysis of Fruit Skin Patterns

### Research Grants

- March 2019 – February 2021: TRF-CHE Research Grant for New Scholar
- แผนภาพลาแกร์โวโรนอยบนทรงกลมแบบมัธยฐานสำหรับการศึกษาและจำลองเทสเซลเลชันบนทรงกลม
- Project: Centroidal spherical Laguerre Voronoi diagram for understanding and modeling spherical tessellation patterns

- October 2018 – 2019: Faculty of Science Research Grant.
- การวิเคราะห์เชิงเรขาคณิตสำหรับปัญหากล่องบนคานรูปสี่เหลี่ยมคางหมู
- Project: Geometrical analysis of a box on the trapezoidal beam problem

- October 2017 – 2018: Faculty of Science Research Grant.
- แผนภาพลาแกร์โวโรนอยบนทรงกลมสำหรับจำลองรูปแบบเทซเซลเลชันในธรรมชาติ
- Project: Spherical Laguerre Voronoi diagram for modeling the tessellation patterns in real world.

### Other Grants

- July – September 2018: FYI 2018 Follow-up Research Fellowship by JASSO
- September 2017:
*The ISPRS Foundation (TIF)*travel grant to attend ISPRS Geospatial Week 2017 (18 – 22 September 2017) at Wuhan, China.

**Research Experience**

- 2013-2014
*Chulalongkorn University, Bangkok, Thailand*- Research Assistant; Department of Mathematics and Computer Science
- Research Topic: Improvement Results of Optimal Partitioning of a Square
- Advisor: Asst.Prof. Wacharin Wichiramala, Ph.D.

- Research Assistant; Department of Mathematics and Computer Science
- 2007
*10th Junior Science Talent Project*- Research Fund for Upper Secondary School and Undergraduate Student by National Science and Technology Development Agency (NSTDA), Thailand
- Research Topic: Some Algebraic Properties of O(Zn)
- Advisor: Prof. Jintana Sanwong

**Academic Membership**

- (2007-present) The Mathematical Association of Thailand Under the Patronage of His Majesty the King: Ordinary Membership
- (2016-present) International Society for Geometry and Graphics (ISGG): Ordinary Membership