个人简介：

 于桂海，理学博士，副教授，硕士生导师，南开大学博士后。主要从事复杂网络、图论及其应用、矩阵分析方面的研究工作。截至目前，共发表学术论文50余篇，其中SCI收录40余篇。主持国家自然基金一项，主持中国博士后基金特别资助项目一项，主持中国博士后基金面上项目一项，主持省自然基金一项，主持山东省优秀中青年科学家基金一项，参与国家基金三项，参与省基金五项，获得山东省高校学校优秀科研成果奖三等奖1项（独立完成）。先后应邀到德国、奥地利、香港、澳门进行学术交流与合作,与国外（包括美国、德国、塞尔维亚、奥地利等）、国内学者建立了合作关系，并合作完成学术论文8篇。

主持的科研项目：

1.国家自然科学基金， 图的结构与特征值的相关问题（11301302），主持

2.中国博士后基金特别资助，图的特征值的相关问题与极值图论（2014T70210），主持

3.中国博士后基金面上项目，图的特征值的相关问题的研究（2013M520869），主持

4.山东省优秀中青年科学家奖励基金，图的惯性指数的相关问题的研究（BS2013SF009），主持

5.山东省自然科学基金，基于eccentricity的图不变量的研究（ZR2011AQ005），主持

科研获奖

1.山东省优秀科研成果奖三等奖 独立完成

已发表的部分论文：

23.Guihai Yu,HuiQu, Matthias Dehmer, Principal minor version of Matrix-Tree theorem for mixedgraphs, Applied Mathematics and Computation, 309 (2017) 27--30.(SCI)

22.GuihaiYu,,Xin Liu,HuiQu, Singularity of Hermitian (quasi-)Laplacianmatrix of mixedgraphs.Appl. Math. Comput.293(2017)287–292.(SCI)

21.GuihaiYu,Lihua Feng, Aleksandar Ilic, The largest n-1 Hossoyaindices of unicyclic graphs, Filomat, 30(9)2016.(SCI)

20.GuihaiYu,Lihua Feng, Hui Qu, Signed graphs with small positive index of inertia,ElectronicJournal of Linear Algebra, (2016) Vol. 31, pp.232--243.(SCI)

19.Guihai Yu,Lihua Feng, AleksandarIlic, Gragan Stevanovic, The signless spectral radius of bounded degree graphson surfaces,Applicable Analysis and Discrete Mathematics, 9(2015)332--346.(SCI)

18.Guihai Yu,Hui Qu,Hermitian Laplacianmatrix and positive of mixed graphs,Appl.Math. Comput.269 (2015) 70--76.(SCI)

17.Guihai Yu,Hui Qu, Jianhua Tu,Inertia of complex unit gain graphs,Applied Mathematics and Computaion,265 (2015) 619--629.(SCI)

16.Hui Qu,Guihai Yu,Bicyclic oriented graphs with skew-rank 2 or 4,AppliedMathematics and Computation,258(2015) 182--191.(SCI)

15.Hui Qu,Guihai Yu,More on the minimum skew-rank of graphs,operatorsand matrices,9(2)(2015) 311--324.(SCI)

14. Xueliang Li,GuihaiYu, The the skew-rank of oriented graphs (in Chinese),Sci. Sin. Math.45(2015) 93--104.中国科学

13.GuihaiYu, Hui Qu, Lang Tang, Lihua Feng, On the connectiveeccentricity index of trees and unicyclic graphs with given diameter,J. Math. Anal. Appl.420(2014) 1776--1786.(SCI) 

12.Guihai Yu, Lihua Feng,Qingwen Wang,A. Ilic,The minimalpositive index of inertia of unicyclic signed graphs,Ars Combinatorica, 117 (2014)245--255.(SCI)

11.GuihaiYu, Xiaodong Zhang, Lihua Feng, The inertia of weighted unicyclic graphs,Linear Algebra Appl.448(2014) 130--152.(SCI)

10.GuihaiYu, Lihua Feng, On connective eccentricity index of graphs,Match-Communications In MathematicalAnd InComputerChemistry69 (2013), 611--628.(SCI)

9.GuihaiYu,Lihua Feng, Qingwen Wang, Bicyclic graphs with small positive index of inertia,Linear Algebra Appl.438 (2013), 2036--2045.(SCI)

8.Guihai Yu,Lihua Feng, Dingguo Wang, On the average eccentricity ofunicyclic graphs,Ars Combinatorica,103(2012) 531--537.(SCI)

7.GuihaiYu, Lihua Feng, Aleksandar Ilić, On the eccentric distance sum of trees andunicyclic graphs,J. Math. Anal. Appl. 375 (2011), 934--944.(SCI)

6.GuihaiYu, Lihua Feng,On the maximal Harary index of a classof bicyclic graphs.Util. Math.82 (2010), 285--292.(SCI)

5.GuihaiYu,Lihua Feng, Aleksandar Ilić,The hyper-Wiener indexof trees with given parameters.Ars Combin.96 (2010), 395--404.(SCI)

4.GuihaiYu,Lihua Feng,Randić index and eigenvalues of graphs.Rocky Mountain J. Math.40 (2010), no. 2, 713--721.(SCI)

3.GuihaiYu,Lihua Feng,On the Wiener index of unicyclic graphswith given girth.Ars Combin.94 (2010), 361--369.(SCI)

2.Guihai Yu;Lihua FengOn the zeroth-order generalRandić index of graphs with given matching number.Recent results in the theory of Randić index,227–233, Math. Chem.Monogr., 6,Univ. Kragujevac, Kragujevac,2008.

1.GuihaiYu,On the maximal signless Laplacian spectral radius ofgraphs with given matching number.Proc. Japan Acad. Ser. A Math. Sci.84 (2008), no. 9, 163--166.(SCI)