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The "KIAS Workshop on Combinatorics" will be held at KIAS, Seoul on May 30- June 1, 2013. If you want to participate, please write a registration form and email to kias@combinatorics.kr until May 10. This workshop will be supported by Open KIAS.

Information

  • Organizers
    • Jeong Han Kim, KIAS
    • Boram Park, NIMS
  • Program Committee
    • Seog-Jin Kim, Konkuk University
    • Youngsoo Kwon, Yeungnam University
    • Seunghyun Seo, Kangwon National University
    • Heesung Shin, Inha University
  • Invited Speakers
    • Gi-Sang Cheon, Sungkyunkwan University
    • Jeong Ok Choi. GIST
    • Mitsugu Hirasaka, Pusan National University
    • Hyun Kwang Kim, POSTECH
    • Sangwook Kim, Chonnam National University
    • Seog-Jin Kim, Konkuk University
    • Younjin Kim, KAIST
    • Youngsoo Kwon, Yeungnam University
    • Seunghyun Seo, Kangwon National University
    • Hwanchul Yoo, KIAS
    • We are going to
      • give 10 invited talks without contributed talks.
      • provide for 5 meals (dinner of May 30, breakfast, lunch, & dinner of May 31, breakfast of June 1) of all participates.
      • support the accommodation for two nights of all students who register until April 30.

    Schedule

    • May 30 (Thursday)
      • 13h00 ~ 14h00 Registration
      • 14h00 ~ 14h10 Opening Ceremony
      • 14h10 ~ 17h20 Session A
        • 14h10 ~ 15h00 Talk 1
        • 15h10 ~ 16h00 Talk 2
        • 16h00 ~ 16h30 Break
        • 16h30 ~ 17h20 Talk 3
    • May 31 (Friday)
      • 09h30 ~ 11h50 Session B
        • 09h30 ~ 10h20 Talk 4
        • 10h20 ~ 10h50 Break
        • 11h00 ~ 11h50 Talk 5
      • 11h50 ~ 14h00 Lunch
      • 14h10 ~ 17h20 Session C
        • 14h10 ~ 15h00 Talk 6
        • 15h10 ~ 16h00 Talk 7
        • 16h00 ~ 16h30 Break
        • 16h30 ~ 17h20 Talk 8
      • 17h40 ~ 00h00 Banquet
    • June 1 (Saturday)
      • 09h30 ~ 11h50 Session D
        • 09h30 ~ 10h20 Talk 9
        • 10h20 ~ 10h50 Break
        • 11h00 ~ 11h50 Talk 10
      • 11h50 ~ 00h00 Closing Ceremony

    Talks (Abstract)

    • Session A
      • Chairman Seog-Jin Kim, Konkuk University
      • Talk 1
        • Speaker Gi-Sang Cheon, Sungkyunkwan University
        • Title The Riordan group and related topics in Combinatorics and Matrix Theory
        • Abstract The Riordan group is the set of infinite lower triangular matrices whose kth column has the generating function g(z)f(z)k where g and f are elements of the ring of formal power series C[[z]] such that g(0)=1, f(0)=0 and f'(0)<>0. Such a matrix is called Riordan matrix and denoted as (g(z); f(z)) or (g; f). The Riordan group shows up naturally in a variety of combinatorial settings and combinatorial matrix theory. This talk is given by two parts. The concept of Riordan group and Riordan matrix will be introduced in the first part by presenting fundamental properties and interesting subgroups. In the second part, we discuss how this concept can be applied to several problems arising in combinatorics and matrix theory.
      • Talk 2
        • Speaker Seog-Jin Kim, Konkuk University
        • Title Coloring of the square of Kneser graphs
        • Abstract The Kneser graph K(n,k) is the graph whose vertices are the k-elements subsets of an n-element set, with two vertices adjacent if the sets are disjoint. The square G2 of  a graph G is the graph defined on V(G) such that two vertices u and v are adjacent in G2 if the distance between u and v in G is at most 2. We denote the square of the Kneser graph K(n,k) by K2(n,k)The problem of computing χ(K2(n,k)), which was originally posed by Füredi, was introduced and discussed by Kim and Nakprasit (2004). Note that that A and B are adjacent in K2(n,k) if and only if A∩B=∅ or |A∩B|≧3k-n. Therefore, K2(n,k) is the complete graph Kt where t=nCk if n≧3k-1, and K2(n,k) is a perfect matching if n=2k. But for 2k+1≦n3k-2, the exact value of χ(K2(n,k)) is not known. Hence it is an interesting problem to determine the chromatic number of the square of the Kneser graph K(2k+1,k) as the first nontrivial case.  We will give a brief introduction of the problem, and present recent results.  This talk is based on joint work with Boram Park.
      • Talk 3
        • Speaker Hyun Kwang Kim, POSTECH
        • Title Polytope numbers and their applications
        • Abstract These is an introductory lecture on combinatorial properties of polytope numbers. We first introduce polytope numbers and their basic properties such as product formula and decomposition theorems. Next we illustrate these properties with some well-known polytopes. Finally we give research problems related to polytope numbers.
    • Session B
      • Chairman Youngsoo Kwon, Yeungnam University
      • Talk 4
        • Speaker Jeong Ok Choi, GIST
        • Title Fractional weak discrepancy of posets
        • Abstract In this talk, various discrepancies of posets (Partially Ordered Sets) will be introduced. In particular, fractional weak discrepancy of a poset is emphasized as a refinement of measuring weakness of a poset. We characterize forbidden structure for posets preventing fractional weak discrepancy larger than k for each natural number k. Also, we give the range of fractional weak discrepancy of (M;2)-free posets.
      • Talk 5
        • Speaker Mitsugu Hirasaka, Pusan National University
        • Title Zeta functions of adjacency algebras of association schemes
        • Abstrac For a module L which has only finitely many submodules with a given finite index we define the zeta function of L to be a formal Dirichlet series ζL(s)=∑n≥1 an-s where an is the number of submodules of L with index nFor a commutative ring R and an association scheme (X,S) we denote the adjacency algebra of (X,S) over R by RS. In this talk we aim to compute ζZS(s) under several assumptions where ZS is viewed as a regular ZS-module.
    • Session C
      • Chairman Heesung Shin, Inha University
      • Talk 6
        • Speaker Youngsoo Kwon, Yeungnam University
        • Title Classification of regular embeddings of some graph families
        • Abstract A regular embedding is a highly symmetric graph embedding onto a surface. Classifications of regular embeddings are pursued by three different directions: by given graphs, groups and surfaces. In this talk, we will consider classification of regular embeddings of graphs. I will introduce several methods to classify regular embeddings of graphs and some recent results.
      • Talk 7
        • Speaker Seunghyun Seo, Kangwon National University
        • Title Colored permutations and generalizations of derangements
        • Abstract A derangement is a permutation without any fixed points. There are several generalizations of derangements in the literature. In this talk, we introduce 5 types of colored permutations which are all generalizations of derangements. We present the generating function of each type and find the hierarchy of them combinatorially. We also present bijective proofs among the objects. This is joint work with Dongsu Kim(NIMS) and Jang Soo Kim(KIAS).
      • Talk 8
        • Speaker Hwanchul Yoo, KIAS
        • Title Balanced labellings of affine permutations and symmetric functions
        • Abstract In this talk, we introduce a generalization of the balanced labellings of Fomin, Greene, Reiner, and Shimozono. We extend the notion in two directions: (1) we define the diagrams of affine permutations and the balanced labellings on them; (2) we define the set-valued version of the balanced labellings. We show that the column-strict balanced labellings on the diagram of an affine permutation yield the affine Stanley symmetric function defined by Lam, and that the column-strict set-valued balanced labellings yield the affine stable Grothendieck polynomial of Lam. Moreover, once we impose suitable flag conditions, the flagged column-strict set-valued balanced labellings on the diagram of a finite permutation give a monomial expansion of the Grothendieck polynomial of Lascoux and Schutzenberger. We also give a necessary and sufficient condition for a diagram to be an affine permutation diagram.
    • Session D
      • Chairman Seunghyun Seo, Kangwon National University
      • Talk 9
        • Speaker Sangwook Kim, Chonnam National University
        • Title Flag enumeration of matroid base polytopes
        • Abstract For a matroid on [n], a matroid base polytope is the polytope in Rn whose vertices are the incidence vectors of the bases of the matroid. In this talk, we discuss flag information of matroid base polytopes for some classes of matroids such as rank 2 matroids and lattice path matroids
      • Talk 10
        • Speaker Younjin Kim, KAIST
        • Title On Combinatorial problems of Erdös
        • Abstract  For a property Γ and a family of sets F, let f(F,Γ) be the size of the largest subfamily of F having property ΓFor a positive integer m, let f(m,Γ) be the minimum of f(F,Γ) over all families of size m. In 1972, Erdös and Shelah also considered Γ to be the property that no four distinct sets satisfy F1∩F2=F3 and F1∩F2=F4Such families are called B2-free. Erdös and Shelah gave an example showing f(m,B2-free)≦(3/2)m2/3 and they also conjectured f(m,B2-free)>c2m2/3We verify a conjecture of Erdös and Shelah from 1972. In1964, Erdös, Hajnal, and Moon introduced the following problem: get the minimum size of a graph G such that G does not contain F as a subgraph but the addition of any new edge creates at least one copy of F in G. This minimum is called the saturation number of F. We obtain the saturation number of Ck, where Ck is a cycle with length k.


    Travel Information

        
                        

     Banquet (Dinner of May 31)

    • 장소는 홀리데이인 성북 호텔 (http://www.holiday.co.kr/holiday/) 뷔페 입니다.
    • 호텔측에서 준비한 차량으로 이동할 예정입니다. (5:30분 고등과학원앞)

     Accommodation

    • 대부분의 참가자들에게 키아스내의 숙소(Kiastel 과 기숙사)를 제공할 예정입니다. 
    • 키아스내의 충분한 숙소확보가 어려운 관계로 대학원생중의 일부는 키아스 외부 숙소로 배정되었습니다. 예정은 홀리데이인 성북 호텔에 2인 1실로 제공 예정이었으나 참가자들의 편의를 위해 도보로 이동할 수 있는 거리에 있는 곳으로 변경하여 1인 1실로 숙소로 배정하였습니다. 숙소는 co-up(http://rent.co-op.co.kr/accommodations_16.htm) 입니다. 해당대학원생분들께 안내메일을 드렸습니다.

    Registration

    • If you want to participate, please fill out the registration form at the bottom of this page and email to kias@combinatorics.kr until May 10, 2013.
    • We plan to reserve hotels near KIAS for participants who register before April 30.
    • We are going to support the accommodation of graduate students who registered on before April 30.
    • We encourage students to come to the workshop.

    Registration form for KIAS Workshp on Combinatorics

    • English Name:
    • Original Name (usually Korean):
    • Affiliation:
    • Status: (Professor/ Post-Doc/ Researcher/ Student)
    • Gender: (Male/Female)
    • If you are a (graduate) student, do you want a support accommodation? (Y/N)
      • Accommodation on May 30: (Y/N)
      • Accommodation on May 31: (Y/N)
      • Notice that we support the accommodation for two nights of any student who registered BEFORE APRIL 30.
    • If you are not a graduate student, do you want a reservation of a hotel? (Y/N)
      • Accommodation on May 30: (Y/N)
      • Accommodation on May 31: (Y/N)
      • Notice that we reserve the accommodation of participant who registered BEFORE APRIL 30.

    Participate

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    NameAffiliationPositionAccommodation
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    NameAffiliationPositionAccommodation
    Bokhee Im / 임복희 Chonnam National University Professor May 30 - June 1 (2 nights) 
    Boram Park / 박보람 NIMS Researcher No 
    Bumtle Kang / 강범틀 Seoul National University Graduate Student No 
    Byungchan Kim / 김병찬 SeoulTech Professor No 
    Chiheon Kim / 김치헌 MIT Graduate Student May 30 - June 1 (2 nights) 
    Dong Han Kim / 김동한 Dongguk University Professor No 
    Dongseok Kim / 김동석 Kyonggi University Professor No 
    DoYong Kwon / 권도용 Chonnam National University Professor No 
    Gi-Sang Cheon / 천기상 Sungkyunkwan University Professor No 
    Hana Kim / 김하나 Sungkyunkwan University Post-Doc May 30 - June 1 (2 nights) 
    Heesung Shin / 신희성 Inha University Professor May 31 - June 1 (1 night) 
    Hwanchul Yoo / 유환철 KIAS Post-Doc No 
    Hyeong-Kwan Ju / 주형관 Chonnam National University Professor May 30 - June 1 (2 nights) 
    Hyun Jin Kim / 김현진 Ewha Womans University Post-Doc No 
    Hyun Kwang Kim / 김현광 POSTECH Professor May 30 - June 1 (2 nights) 
    Il-Hyung Kim / 김일형  Seoul National University Post-Doc No 
    Jaehoon Kim / 김재훈 UIUC Graduate Student May 30 - June 1 (2 nights) 
    Jaeseong Heo / 허재성 Hanyang University Professor No 
    Jeong Han Kim / 김정한 KIAS Professor No 
    Jeong Ok Choi / 최정옥  GIST Professor May 30 - June 1 (2 nights) 
    Jeong-woo Seo / 서정우  Yeungnam University Graduate Student May 30 - June 1 (2 nights) 
    Jihoon Choi / 최지훈 Seoul National University Graduate Student No 
    Ji-Hwan Jung / 정지환 Sungkyunkwan University Graduate Student May 30 - June 1 (2 nights) 
    Jihye Park / 박지혜  Yeungnam University Graduate Student May 30 - June 1 (2 nights) 
    Jihyun Seo / 서지현  Yeungnam University Graduate Student No 
    Jisu Jeong / 정지수 KAIST Graduate Student May 30 - June 1 (2 nights) 
    Jong Yoon Hyun / 현종윤 Ewha Womans University Post-Doc No 
    Jon-Lark Kim / 김종락 Sogang University Professor No 
    Joonkyung Lee / 이준경 Korea Military Academy Researcher No 
    Joon Yop Lee / 이준엽 POSTECH Post-Doc May 30 - June 1 (2 nights) 
    Jun Ho Lee / 이준호 KIAS Post-Doc No 
    Junyong Park / 박준용 Sogang University Graduate Student No 
    Kang-Ju Lee / 이강주 Seoul National University Graduate Student May 30 - June 1 (2 nights) 
    Kwangsoo Park / 박광수 Sungkyunkwan University Undergraduate Student May 30 - June 1 (2 nights) 
    Mark Siggers Kyungpook National University Professor No 
    Meesue Yoo / 유미수  KIAS Post-Doc No 
    Minho Song / 송민호 Sungkyunkwan University Graduate Student May 30 - June 1 (2 nights) 
    Min Ki Kim / 김민기 KAIST Graduate Student May 30 - June 1 (2 nights) 
    Mitsugu Hirasaka Pusan National University Professor May 30 - June 1 (2 nights) 
    Mohit Kumbhat Sungkyunkwan University Professor No 
    Sang-il Oum / 엄상일 KAIST Professor May 30 - June 1 (2 nights) 
    Sangjib Kim / 김상집 Ewha Womans University Professor No 
    Sang June Lee / 이상준 KAIST Post-Doc May 30 - June 1 (2 nights) 
    Sangwook Kim / 김상욱 Chonnam National University Professor May 30 - June 1 (2 nights) 
    Sejeong Bang / 방세정 Yeungnam University Professor May 31 - June 1 (1 night) 
    Seog-Jin Kim / 김석진 Konkuk University Professor No 
    Seongmin Ok / 옥성민 Technical University of Denmark Graduate Student May 30 - June 1 (2 nights) 
    Seunghyun Seo / 서승현 Kangwon National University Professor May 30 - June 1 (2 nights) 
    Soohak Choi / 최수학 Ewha Womans University Post-Doc No 
    Sook Min / 민숙 Yonsei University Professor May 31 - June 1 (1 night) 
    Sun Ah Kim / 김선아 Seoul National University Graduate Student No 
    Sung-Tae Jin / 진성태 Sungkyunkwan University Graduate Student May 30 - June 1 (2 nights) 
    Sung Wook Nam / 남성욱 Inha University Undergraduate Student May 31 - June 1 (1 night) 
    Suyoung Choi / 최수영 Ajou University Professor No 
    Yoomi Rho / 노유미 University of Incheon Professor No 
    Youngsoo Kwon / 권영수 Yeungnam University Professor May 30 - June 1 (2 nights) 
    Younjin Kim / 김연진 KAIST Post-Doc May 30 - June 1 (2 nights) 
    Showing 57 items
    Subpages (1): Abstract