O., Suil; Park, Jeong Rye; Park, Jongyook; Zhang, Wenqian Sharp spectral bounds for the edge-connectivity of regular graphs. (English) Zbl 1512.05241 Eur. J. Comb. 110, Article ID 103713, 8 p. (2023). MSC: 05C40 05C50 15A18 PDFBibTeX XMLCite \textit{S. O.} et al., Eur. J. Comb. 110, Article ID 103713, 8 p. (2023; Zbl 1512.05241) Full Text: DOI
Tan, Ying-Ying; Koolen, Jack H.; Cao, Meng-Yue; Park, Jongyook Thin \(Q\)-polynomial distance-regular graphs have bounded \(c_2\). (English) Zbl 1507.05109 Graphs Comb. 38, No. 6, Paper No. 175, 18 p. (2022); correction ibid. 39, No. 1, Paper No. 12, 1 p. (2023). Reviewer: Dean Crnković (Rijeka) MSC: 05E30 05C12 PDFBibTeX XMLCite \textit{Y.-Y. Tan} et al., Graphs Comb. 38, No. 6, Paper No. 175, 18 p. (2022; Zbl 1507.05109) Full Text: DOI
Park, Jongyook A relationship between the second largest eigenvalue and local valency of an edge-regular graph. (English) Zbl 1482.05348 Kyungpook Math. J. 61, No. 3, 671-677 (2021). MSC: 05E30 PDFBibTeX XMLCite \textit{J. Park}, Kyungpook Math. J. 61, No. 3, 671--677 (2021; Zbl 1482.05348) Full Text: DOI
Greaves, Gary R. W.; Koolen, Jack H.; Park, Jongyook Augmenting the Delsarte bound: a forbidden interval for the order of maximal cliques in strongly regular graphs. (English) Zbl 1473.05323 Eur. J. Comb. 97, Article ID 103384, 10 p. (2021). Reviewer: Djoko Suprijanto (Bandung) MSC: 05E30 PDFBibTeX XMLCite \textit{G. R. W. Greaves} et al., Eur. J. Comb. 97, Article ID 103384, 10 p. (2021; Zbl 1473.05323) Full Text: DOI
Iqbal, Quaid; Koolen, Jack H.; Park, Jongyook; Rehman, Masood Ur Distance-regular graphs with diameter 3 and eigenvalue \(a_2 - c_3\). (English) Zbl 1437.05240 Linear Algebra Appl. 587, 271-290 (2020). MSC: 05E30 05C50 05C12 PDFBibTeX XMLCite \textit{Q. Iqbal} et al., Linear Algebra Appl. 587, 271--290 (2020; Zbl 1437.05240) Full Text: DOI
Koolen, Jack H.; Iqbal, Quaid; Park, Jongyook; Rehman, Masood Ur There does not exist a distance-regular graph with intersection array \(\{80, 54,12; 1, 6, 60\}\). (English) Zbl 1439.05069 Graphs Comb. 35, No. 6, 1597-1608 (2019). Reviewer: Ayesha Shabbir (Ahsaa-Hofouf) MSC: 05C12 05E30 PDFBibTeX XMLCite \textit{J. H. Koolen} et al., Graphs Comb. 35, No. 6, 1597--1608 (2019; Zbl 1439.05069) Full Text: DOI arXiv
Qiao, Zhi; Park, Jongyook; Koolen, Jack H. On 2-walk-regular graphs with a large intersection number \(c_2\). (English) Zbl 1416.05161 Eur. J. Comb. 80, 224-235 (2019). MSC: 05C40 05C12 PDFBibTeX XMLCite \textit{Z. Qiao} et al., Eur. J. Comb. 80, 224--235 (2019; Zbl 1416.05161) Full Text: DOI
van Dam, Edwin R.; Koolen, Jack H.; Park, Jongyook Partially metric association schemes with a multiplicity three. (English) Zbl 1384.05185 J. Comb. Theory, Ser. B 130, 19-48 (2018). MSC: 05E30 05C12 PDFBibTeX XMLCite \textit{E. R. van Dam} et al., J. Comb. Theory, Ser. B 130, 19--48 (2018; Zbl 1384.05185) Full Text: DOI arXiv
Park, Jongyook The distance-regular graphs with valency \(k \geq 2\), diameter \(D \geq 3\) and \(k_{D - 1} + k_D \leq 2 k\). (English) Zbl 1351.05065 Discrete Math. 340, No. 3, 550-561 (2017). MSC: 05C12 PDFBibTeX XMLCite \textit{J. Park}, Discrete Math. 340, No. 3, 550--561 (2017; Zbl 1351.05065) Full Text: DOI
Qiao, Zhi; Koolen, Jack H.; Park, Jongyook 2-walk-regular graphs with a small number of vertices compared to the valency. (English) Zbl 1352.05063 Linear Algebra Appl. 510, 10-24 (2016). MSC: 05C12 05E30 05C50 PDFBibTeX XMLCite \textit{Z. Qiao} et al., Linear Algebra Appl. 510, 10--24 (2016; Zbl 1352.05063) Full Text: DOI
Bang, Sejeong; Koolen, Jack H.; Park, Jongyook Some results on the eigenvalues of distance-regular graphs. (English) Zbl 1327.05198 Graphs Comb. 31, No. 6, 1841-1853 (2015). MSC: 05C50 05C12 PDFBibTeX XMLCite \textit{S. Bang} et al., Graphs Comb. 31, No. 6, 1841--1853 (2015; Zbl 1327.05198) Full Text: DOI
Koolen, Jack H.; Park, Jongyook A note on distance-regular graphs with a small number of vertices compared to the valency. (English) Zbl 1285.05045 Eur. J. Comb. 34, No. 6, 935-940 (2013). MSC: 05C12 PDFBibTeX XMLCite \textit{J. H. Koolen} and \textit{J. Park}, Eur. J. Comb. 34, No. 6, 935--940 (2013; Zbl 1285.05045) Full Text: DOI
Cámara, Marc; van Dam, Edwin R.; Koolen, Jack H.; Park, Jongyook Geometric aspects of 2-walk-regular graphs. (English) Zbl 1282.05215 Linear Algebra Appl. 439, No. 9, 2692-2710 (2013). MSC: 05E30 05C50 PDFBibTeX XMLCite \textit{M. Cámara} et al., Linear Algebra Appl. 439, No. 9, 2692--2710 (2013; Zbl 1282.05215) Full Text: DOI arXiv
Koolen, Jack H.; Park, Jongyook A relationship between the diameter and the intersection number \(c _{2}\) for a distance-regular graph. (English) Zbl 1245.05037 Des. Codes Cryptography 65, No. 1-2, 55-63 (2012). MSC: 05C12 05E30 05C65 PDFBibTeX XMLCite \textit{J. H. Koolen} and \textit{J. Park}, Des. Codes Cryptography 65, No. 1--2, 55--63 (2012; Zbl 1245.05037) Full Text: DOI arXiv
Koolen, Jack H.; Park, Jongyook Distance-regular graphs with or at least half the valency. (English) Zbl 1235.05043 J. Comb. Theory, Ser. A 119, No. 3, 546-555 (2012). MSC: 05C12 PDFBibTeX XMLCite \textit{J. H. Koolen} and \textit{J. Park}, J. Comb. Theory, Ser. A 119, No. 3, 546--555 (2012; Zbl 1235.05043) Full Text: DOI arXiv
Koolen, Jack H.; Park, Jongyook; Yu, Hyonju An inequality involving the second largest and smallest eigenvalue of a distance-regular graph. (English) Zbl 1226.05159 Linear Algebra Appl. 434, No. 12, 2404-2412 (2011). MSC: 05C50 15A42 PDFBibTeX XMLCite \textit{J. H. Koolen} et al., Linear Algebra Appl. 434, No. 12, 2404--2412 (2011; Zbl 1226.05159) Full Text: DOI arXiv
Koolen, Jack H.; Park, Jongyook Shilla distance-regular graphs. (English) Zbl 1221.05117 Eur. J. Comb. 31, No. 8, 2064-2073 (2010). MSC: 05C12 PDFBibTeX XMLCite \textit{J. H. Koolen} and \textit{J. Park}, Eur. J. Comb. 31, No. 8, 2064--2073 (2010; Zbl 1221.05117) Full Text: DOI arXiv