## 摘要

We consider a generalization of both the classic Steiner tree problem and the terminal Steiner tree problem. Given a complete graph G = (V,E) with a metric cost function c:E BBQ≥ and two proper subsets R V and R′ R , a partial-terminal Steiner tree is a Steiner tree which contains all vertices in it R such that all vertices in R ′ must be leaves. The partial-terminal Steiner tree problem is to find a partial-terminal Steiner tree of the minimum cost in G. The previously best-known approximation ratio of the problem is 2ρ , where ρ is the approximation ratio of the Steiner tree problem. In this paper, we improve the ratio from 2ρ to 2ρ-ρ3ρ-2-f , where f is a non-negative function whose value is between 0 and ρ-ρ over 3ρ-2.

原文 | English |
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文章編號 | 6636895 |

頁（從 - 到） | 274-279 |

頁數 | 6 |

期刊 | IEEE Transactions on Computers |

卷 | 64 |

發行號 | 1 |

DOIs | |

出版狀態 | Published - 2015 一月 1 |

## All Science Journal Classification (ASJC) codes

- 軟體
- 理論電腦科學
- 硬體和架構
- 計算機理論與數學