Researchers Database

Jang Yeonhee

FacultyFaculty Division of Natural Sciences Research Group of Mathematics
PositionAssociate Professor
Last Updated :2022/10/06

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Profile and Settings

  • Name (Japanese)

    Jang
  • Name (Kana)

    Yeonhee

Degree

  • Master of Science, Osaka University
  • Ph.D., Hiroshima University

Research Interests

  • 3次元多様体論
  • 結び目理論
  • 3-dimensional manifolds
  • Knot Theory

Research Areas

  • Natural sciences, Geometry

Research Experience

  • Jan. 2019, 9999, Nara Women's University, Faculty, Division of Natural Sciences, 准教授
  • Apr. 2013, Dec. 2018, Nara Women's University, Faculty, Division of Natural Sciences, 助教
  • 2012, 2013, 日本学術振興会外国人特別研究員
  • 2012, 2013, :JSPS Foreign Research Fellow
  • 2013, -:Nara Women's University, Assistant Professor
  • 2010, 2012, 日本学術振興会特別研究員
  • 2010, 2012, :JSPS Research Fellow

Education

  • Apr. 2008, Mar. 2011, Hiroshima University, 理学研究科, 数学専攻, Japan
  • 2011, Hiroshima University, Graduate School of Sciences, Department of Mathematics
  • Apr. 2006, Mar. 2008, Osaka University, 理学研究科, 数学専攻, Japan
  • 2008, Osaka University, Graduate School of Sciences, Department of Mathematics
  • Mar. 2000, Aug. 2004, 全北大学校, 師範大学, 数学教育学科, Korea, Republic of
  • 2004, Chonbuk National University, College of Education, Department of Mathematics Education, Korea, Republic of

Association Memberships

  • 日本数学会

Ⅱ.研究活動実績

Published Papers

  • Refereed, Adv. Stud. Pure Math., MATH SOC JAPAN, On keen Heegaard splittings, Ayako Ido; Yeonhee Jang; Tsuyoshi Kobayashi, In this paper, we introduce a new concept of strongly keen for Heegaard splittings, and show that, for any integers n > 2 and g > 3, there exists a strongly keen Heegaard splitting of genus g whose Hempel distance is n., Oct. 2018, 78, 293, 311, International conference proceedings
  • Refereed, Pacific Journal of Mathematics, University of California, Berkeley, Meridional rank and bridge number for a class of links, Michel Boileau; Yeonhee Jang; Richard Weidmann, We prove that links with meridional rank 3 whose 2-fold branched covers are graph manifolds are 3-bridge links. This gives a partial answer to a question by S. Cappell and J. Shaneson on the relation between the bridge numbers and meridional ranks of links. To prove this result, we also show that the meridional rank of any satellite knot is at least 4., 2018, 292, 1, 61, 80, Scientific journal
  • Refereed, TOPOLOGY AND ITS APPLICATIONS, ELSEVIER SCIENCE BV, Meridional rank of knots whose exterior is a graph manifold, Michel Boileau; Ederson Dutra; Yeonhee Jang; Richard Weidmann, We prove for a large class of knots that the meridional rank coincides with the bridge number. This class contains all knots whose exterior is a graph manifold. This gives a partial answer to a question of S. Cappell and J. Shaneson [10, pb 1.11]. (C) 2017 Elsevier B.V. All rights reserved., Sep. 2017, 228, 458, 485, Scientific journal
  • Refereed, JOURNAL OF THE LONDON MATHEMATICAL SOCIETY-SECOND SERIES, OXFORD UNIV PRESS, A knot with destabilized bridge spheres of arbitrarily high bridge number, Yeonhee Jang; Tsuyoshi Kobayashi; Makoto Ozawa; Kazuto Takao, We show that there exists an infinite family of knots, each of which has, for each integer k >= 0, a destabilized (2k + 5)-bridge sphere. We also show that, for each integer n >= 4, there exists a knot with a destabilized 3-bridge sphere and a destabilized n-bridge sphere., Apr. 2016, 93, 2, 379, 396, Scientific journal
  • Refereed, TOPOLOGY AND ITS APPLICATIONS, ELSEVIER SCIENCE BV, Bridge splittings of links with distance exactly n, Ayako Ido; Yeonhee Jang; Tsuyoshi Kobayashi, We show that, for any integers n >= 2, g >= 0 and b >= 1 except for (g, b) = (0,1) and (0, 2), there exists a (g, b)-bridge splitting of a link in some manifold with distance exactly n. (C) 2015 Elsevier B.V. All rights reserved., Dec. 2015, 196, 608, 617, Scientific journal
  • Refereed, PACIFIC JOURNAL OF MATHEMATICS, PACIFIC JOURNAL MATHEMATICS, Distance of bridge surfaces for links with essential meridional spheres, Yeonhee Jang, Bachman and Schleimer gave an upper bound for the distance of a bridge surface of a knot in a 3-manifold which admits an essential surface in the exterior. Here we give a sharper upper bound for the distance of a bridge surface of a link when the manifold admits an essential meridional sphere in the exterior., Jan. 2014, 267, 1, 121, 130, Scientific journal
  • Refereed, ALGEBRAIC AND GEOMETRIC TOPOLOGY, GEOMETRY & TOPOLOGY PUBLICATIONS, Heegaard splittings of distance exactly n, Ayako Ido; Yeonhee Jang; Tsuyoshi Kobayashi, In this paper, we show that, for any integers n >= 2 and g >= 2, there exist genus-g Heegaard splittings of compact 3-manifolds with distance exactly n., 2014, 14, 3, 1395, 1411, Scientific journal
  • Refereed, Journal of the Mathematical Society of Japan, Classification of 3-bridge spheres of 3-bridge arborescent links, Yeonhee Jang, In this paper, we give an isotopy classification of 3-bridge spheres of 3-bridge arborescent links, which are not Montesinos links. To this end, we prove a certain refinement of a theorem of J. S. Birman and H. M. Hilden [3] on the relation between bridge presentations of links and Heegaard splittings of 3-manifolds. In the proof of this result, we also give an answer to a question by K. Morimoto [23] on the classification of genus-2 Heegaard splittings of certain graph manifolds. © 2013 The Mathematical Society of Japan., 2013, 65, 1, 97, 136, Scientific journal
  • Refereed, Illinois Journal of Mathematics, A G-family of quandles and handlebody-knots, Atsushi Ishii; Masahide Iwakiri; Yeonhee Jang; Kanako Oshiro, 2013, 57, 3, 817, 838
  • Refereed, JOURNAL OF KNOT THEORY AND ITS RAMIFICATIONS, WORLD SCIENTIFIC PUBL CO PTE LTD, Symmetric quandle colorings for spatial graphs and handlebody-links, Yeonhee Jang; Kanako Oshiro, In this paper, colorings by symmetric quandles for spatial graphs and handlebody-links are introduced. We also introduce colorings by LH-quandles for LH-links. LH-links are handlebody-links, some of whose circle components are specified, which are related to Heegaard splittings of link exteriors. We also discuss quandle (co)homology groups and cocycle invariants., Apr. 2012, 21, 4, Scientific journal
  • Refereed, TOPOLOGY AND ITS APPLICATIONS, ELSEVIER SCIENCE BV, Characterization of 3-bridge links with infinitely many 3-bridge spheres, Yeonhee Jang, In an earlier paper, the author constructed an infinite family of 3-bridge links each of which admits infinitely many 3-bridge spheres up to isotopy. In this paper, we prove that if a prime, unsplittable link L in S-3 admits infinitely many 3-bridge spheres up to isotopy then L belongs to the family. (C) 2011 Elsevier B.V. All rights reserved., Mar. 2012, 159, 4, 1132, 1145, Scientific journal
  • Refereed, HIROSHIMA MATHEMATICAL JOURNAL, HIROSHIMA UNIV, GRAD SCH SCI, Classification of 3-bridge arborescent links, Yeonhee Jang, In this paper, we give a complete classification of 3-bridge arborescent links., Mar. 2011, 41, 1, 89, 136, Scientific journal
  • Refereed, TOPOLOGY AND ITS APPLICATIONS, ELSEVIER SCIENCE BV, Three-bridge links with infinitely many three-bridge spheres, Yeonhee Jang, we construct infinitely many three-bridge links each of which admits infinitely many three-bridge spheres up to isotopy. (C) 2009 Elsevier B.V. All rights reserved., Jan. 2010, 157, 1, 165, 172, Scientific journal
  • Refereed, Journal of Knot Theory and Its Ramifications, On 2-twist-spun spherical Montesinos knots, Yeonhee Jang; Misaki Kataoka; Rika Miyakoshi, Dec. 2020, 29, 14, Scientific journal
  • Refereed, Geometriae Dedicata, Double branched covers of tunnel number one knots, Yeonhee Jang; Luisa Paoluzzi, Apr. 2021, 211, 1, 129, 143, Scientific journal

MISC

  • Not Refereed, RIMS kokyuroku, Extending geodesics in the curve complex, 張 娟姫; Ayako Ido; Tsuyoshi Kobayashi, 2013, 1836, 1, 6
  • Not Refereed, RIMS kokyuroku, (1,1)-bridge splitting with distance exactly n, 張 娟姫; Ayako Ido; Tsuyoshi Kobayashi, 2013, 1868, 32, 37

Presentations

  • Women in Mathematics - a Panorama of Contributions, Bridge splittings of links as viewed from the curve complex, 2017
  • The 6th TAPU-KOOK Joint Seminar on Knots and Related Topics, Knots with non-minimal dstabilized bridge spheres, 2014
  • A Satellite Conference of Seoul ICM 2014: Knots and Low Dimensional Manifolds, Bridge splittings of links with Hempel distance n, 2014

Research Projects

  • 21K20328, Principal investigator


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