Prof. Dr.Thawhat Changphas

ศาสตราจารย์ ดร.ธวัช ช่างผัส

Thawhat Changphas, Dr. rer. nat.

Professor

Office: SC7206
Email: thacha@kku.ac.th

Education

2005 Dr.rer.nat. (Mathematics) Potsdam University Germany
1998 M.Sc. (Mathematics) Chulalongkorn University Thailand
1995 B.Sc. (Mathematics) Khon Kaen University Thailand

Research Interests

Algebra
Semigroup
Universal Algebra

Publications

SCOPUS : https://www.scopus.com/authid/detail.uri?authorId=55876904900

  • Bussaban; Thawhat Changphas; , On (m, n)-ideals and (m, n)-regular ordered semigroups, Songklanakarin Journal of Science and Technology , Vol. 38: 2,p.199-206, 2016
  • Thawhat Changphas; P Summaprab; , On Ordered Semigroups Containing Covered Ideals, COMMUNICATIONS IN ALGEBRA, Vol. 44: 9, p.4104-4113, 2016
  • P Luangchaisri; Thawhat Changphas; , On ordered semigroups which are semilattices of (0,n) -simple ordered semigroups, Far East Journal of Mathematical Sciences , Vol. 99: 10 May(2016) p.1589-1601, 2016
  • P Luangchaisri; Thawhat Changphas; , On the principal (m,n)-ideals in the direct product of two semigroups, Quasigroups and Related Systems, Vol. 24: 1 ,p.75-80, 2016
  • L. Bussaban; T. Changphas; , A note on (m,n)-ideals in regular due ordered semigroups, Quasigroups and Related Systems, vol. 23, 2015, 211-216., 2015
  • B. Thomhkam; T. Changphas; , On two-sided bases of ternary semigroups, Quasigroups and Related Systems, vol. 23, 2015, 319-324. , 2015
  • B. Davvaz; P. Corsini; T. Changphas; , Relationship between ordered semihypergroups and ordered semigroups by using psudoorder, European Journal of Combinatorics, vol. 44, 2015, 208-217. , 2015
  • Changphas, T.; , On (m, n)-ideals of an ordered semigroup, International Journal of Pure and Applied Mathematics, Vol.100 p.1-5(2015), 2015
  • Kanasri, N.R.; Laohakosol, V.; Changphas, T.; , Some quadratic irrationals with explicit continued fraction and Engel series expansions, Studia Scientiarum Mathematicarum Hungarica, Vol.52 p.316-336, 2015
  • Changphas, T.; , On (m, n)-regularity of ┌-semigroups, Thai Journal of Mathematics, Vol.13 p.137-145, 2015
  • Davvaz, B.; Corsini, P.; Changphas, T.; , Relationship between ordered semihypergroups and ordered semigroups by using pseudoorder, European Journal of Combinatorics(2014), 2014
  • Summaprab, P.; Changphas, T.; , On bases and maximal ideals in an ordered semigroup, International Journal of Pure and Applied Mathematics, Vol. 92, page 117-124(2014), 2014
  • Changphas, T.; , On certain relations for C-closure operations on an ordered semigroup, International Journal of Pure and Applied Mathematics, Vol.92, page 51-59(2014), 2014
  • Sanborisoot, J.; Changphas, T.; , On pure ideals in ordered ternary semigroups, Thai journal of Mathematics, Vol.12, page 455-464 (2014), 2014
  • Changphas, T.; Davvaz, B.; , Properties of hyperideals in ordered semihypergroups, Italian Journal of Pure and Applied Mathematics, No.33, page 425-432(2014), 2014
  • Changphas, T.; Sanborisoot, J.; , Pure ideals in ordered semigroups, Kyungpook Mathematical Journal, Vol.54, page 123-129(2014), 2014
  • Changphas, T.; , On (m, n)-ideals of an ordered semigroup, Far East Journal of Mathematical Sciences, Vol.88, page 137-145 (2014), 2014
  • Changphas, T.; , On maximal ideals in ternary semigroups, International Journal of Pure and Applied Mathematics, Vol.92, page 133-139(2014), 2014
  • Changphas, T.; , On simple left, right and two-sided ideals of an ordered semigroup having a kernel, Bulletin of the Korean Mathematical Society, Vol. 51 page 1217-1227(2014), 2014
  • Changphas, T.; , On one-sided bases of an ordered semigroup, Wulfenia Journal, Vol.21, page 315-321 (2014), 2014
  • Changphas, T.; , On two-sided bases of an ordered semigroup, Quasigroups and Related Systems, Vol.22, page 59-66(2014), 2014
  • Changphas, T.; , On decompositions of ordered semigroups, International Journal of Pure and Applied Mathematics, Vol.90, page 57-64 (2014), 2014
  • Changphas, T.; , On 0-minimal ideals in a dual ordered semigroup with zero, Scientiae MathematicaeJaponicae, Vol.27, page 81-86 (2014), 2014
  • Thawhat Changphas; , ON COMPLETE IDEALS IN ORDERED SEMIGROUPS, Far East Journal of Mathematics Sciences (FJMS), Vol. 75 No. 2 (2013) 225-232, 2013
  • Thawhat Changphas; , RIGHT PRIME IDEALS AND MAXIMAL RIGHT IDEALS IN ORDERED SEMIGROUPS, Far Fast Journal of mathematics sciences (FJMS), Vol. 73 no. 1 (2013) 65-72, 2013
  • Thawhat Changphas; , ON COMPLETE α-IDEALS IN ORDERED SEMIGROUPS, International Journal of Pure and Applied Mathematics, Vol. 86 No. 3 (2013) 465-470, 2013
  • Thawhat Changphas; , ON 0-MINIMAL (0,2)-BI-Γ-IDEALS IN Γ-SEMIGROUPS, International Journal of Pure and Applied Mathematics, Vol. 84 No. 5 (2013) 549-556, 2013
  • Wichayaporn Jantanan; Thawhat changphas; , On 0-minimal (0,2)-bi-ideals in ordered semigroups, Quasigroups and Related Systems, 21 (2013), 83-90, 2013
  • Thawhat Changphas; , On classes of regularity in an ordered semigroups., Quasigroups and Related Systems, 21(2013) 43-48, 2013
  • Thawhat Changphas; , A NOTE ON RIGHT SIMPLE ELEMENTS ORDERED SEMIGROUPS, Far Fast Journal of mathematics sciences (FJMS), Vol. 79 No. 2 (2013) 267-272, 2013
  • Thawhat Changphas; , ON REGULAR DUO ORDERED SEMIGROUP, Far Fast Juarnal of Mathematics Sciences (FJMS), Vol. 79 No. 2 (2013) 177-183, 2013
  • Thawhat Changphas; , On 0-minimal (m,n)-ideals in an ordered semigroup , International Journal of Pure and Applied Mathematics, Vol. 89 (2013) 71-78, 2013
  • Thawhat Changphas; , Ascending chain conditions on principal left and right ideals for semidirect products of ordered semigroups, Quasigroups and Related Systems, 21(2013) 147-154, 2013
  • Thawhat Changphas; , On maximal alpha-ideals in ordered semigroups, Far Fast Juarnal of Mathematics Sciences (FJMS), Vol. 81 (2013) 245-252, 2013
  • Thawhat Changphas; , Generalized ideals in ordered semigroups, Far Fast Juarnal of Mathematics Sciences (FJMS), Vol. 81 (2013) 147-156, 2013
  • Changphas, T.; , On the decomposition of prime ideals of ordered $\Gamma$-semigroups into their N -classes, Far East Journal of Mathematical Sciences, Volume 64, Issue 1, , Pages 121-127, 2012
  • Hemvong, W.; Changphas, T.; , On semigroups of regular hypersubstitutions, International Journal of Pure and Applied Mathematics, Volume 76, Issue 2, 2012, Pages 219-225 (Q4), 2012
  • Sanborisoot, J.; Changphas, T.; , On characterizations of (m, n)-regular ordered semigroups, Far East Journal of Mathematical Sciences, Volume 65, Issue 1, , Pages 75-86, 2012
  • Changphas, T.; Thongkam, B.; , Roughness of Γ-subsemigroups and ideals in ordered Γ-semigroups, Applied Mathematical Sciences, Volume 6, Issue 45-48, , Pages 2395-2401 (Q4), 2012
  • Hemvong, W.; Changphas, T.; , The order of hypersubstitutions of type $\tau$ = (n), Applied Mathematical Sciences, Volume 6, Issue 41-44, , Pages 2019-2027 (Q4), 2012
  • Changphas, T.; , A note on quasi and bi-ideals in ordered ternary semigroups, International Journal of Mathematical Analysis, Volume 6, Issue 9-12, , Pages 527-532 (Q4), 2012
  • Changphas, T.; , On Intra-Regular Semigroups, International Journal of Contemporary Mathematical Sciences, 2012
  • Changphas, T.; , Prime Ideals of the Cartesian Product of Two Ordered Semigroups, International Journal of Contemporary Mathematical Sciences, 2012
  • Changphas, T.; , On Soft Algebras in a General Viewpoint, International Journal of Algebra, Vol.6, No.1-4, 109-116, 2012
  • Changphas, T.; , g- Congruences on po- – Semigroups, International Journal of Algebra, 2012
  • Changphas, T.; , A Note on Minimal Quasi-Ideals in Ternary Semigroups, International Mathematical Forum, 2012
  • Changphas, T.; , Bi-ideals in Ordered Semigroups, International Mathematical Forum, 2012
  • Changphas, T.; , Bi-ideals in Ternary Semigroups, Applied Mathematical Sciences , (Q4), 2012
  • Changphas, T.; , Bi-ideals in Ordered Ternary Semigroups, Applied Mathematical Sciences, (Q4), 2012
  • Changphas, T.; , On soft Semigroups, Annals of fuzzy mathematics and informations, 2012
  • Changphas, T.; , A note on maximal ideals in ordered gamma-semigroups, International Mathematical Forum, Vol. 6, 3343-3347, 2012
  • Changphas, Tawhat; Sullivan, R. P.; , Skew idempotents in linear transformation semigroups, Linear Multilinear Algebra , 58 (2010), no. 3-4, 399-411, 2010