Yijia Chen

Publications (5)0 Total impact

• Source

  Available from: ArXiv

  Article: The parameterized complexity of k-edge induced subgraphs

  Bingkai Lin, Yijia Chen
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  ABSTRACT: We prove that finding a $k$-edge induced subgraph is fixed-parameter tractable, thereby answering an open problem of Leizhen Cai. Our algorithm is based on several combinatorial observations, Gauss' famous \emph{Eureka} theorem [Andrews, 86], and a generalization of the well-known fpt-algorithm for the model-checking problem for first-order logic on graphs with locally bounded tree-width due to Frick and Grohe [Frick and Grohe, 01]. On the other hand, we show that two natural counting versions of the problem are hard. Hence, the $k$-edge induced subgraph problem is one of the rare known examples in parameterized complexity that are easy for decision while hard for counting.
  05/2011;
• Source

  Available from: sjtu.edu.cn

  Conference Proceeding: On Parameterized Path and Chordless Path Problems

  Yijia Chen, J. Flum
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  ABSTRACT: We study the parameterized complexity of various path (and cycle) problems, the parameter being the length of the path. For example, we show that the problem of the existence of a maximal path of length k in a graph G is fixed-parameter tractable, while its counting version is #W[1]- complete. The corresponding problems for chordless (or induced) paths are W[2]-complete and #W[2]-complete respectively. With the tools developed in this paper we derive the NP-completeness of a related classical problem, thereby solving a problem due to Hedetniemi.
  Computational Complexity, 2007. CCC '07. Twenty-Second Annual IEEE Conference on; 07/2007
• Article: Corporate Governance and Corporate Performance: Some Evidence from Newly Listed Firms on Chinese Stock Markets

  Langnan Chen, Steven Li, Yijia Chen
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  ABSTRACT: This paper is concerned with some corporate governance issues related to newly listed firms in China based on a sample of 329 firms commencing listing on Shanghai Stock Exchange (SHSE) and Shenzhen Stock exchange (SZSE) during the period from 1998 to 2000. We first investigate the impact of ownership change due to stock market listing on corporate performance. We consider four aspects of corporate performance: profitability, sales, leverage and employee productivity. Our research results indicate that, on average, profitability, sales and employee productivity have improved from pre-listing to post-listing. We further investigate the impacts of state majority control, foreign ownership and regulation effects on corporate performance. Overall, this paper provides some new evidence on the listing effect, ownership structure and regulation effect on Chinese firms which will be valuable to the future reform of state owned enterprises in China.
  07/2005;
• Conference Proceeding: Automatic generation of parallel compiler-partial evaluation ofparallel lambda language

  Yongqiang Sun, Kai Lin, Yijia Chen
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  ABSTRACT: We describe in this paper a partial evaluator for a parallel programming language. The parallel language we present is a combination of lambda calculus and message passing communication mechanism. By improving some techniques originally used for partial evaluation of sequential language and introducing some new methods, we successfully solve the problems caused by some internal semantic differences between lambda calculus and message passing in our partial evaluator for the parallel language
  Advances in Parallel and Distributed Computing, 1997. Proceedings; 04/1997
• Source

  Available from: psu.edu

  Article: Model-checking problems, machines and parameterized complexity /

  Yijia. Chen
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  ABSTRACT: Freiburg (Breisgau), University, Diss., 2004 (Nicht für den Austausch).