The node-weighted Steiner tree problem is a variation of classical Steiner minimum tree problem. Given a graph G = (V,E) with node weight function C : V → R and a subset X of V , the node-weighted Steiner tree problem is to find a Steiner tree for the set X such that its total weight is minimum. In this paper, we study this problem in unit disk graphs and present a (1+ε)-approximation algorithm...

Smart and directional antennas can be used to improve the throughput performance of wireless communications in ad hoc networks. This improvement consists basically of minimizing collision and increasing simultaneous communications. Directional antennas reduce potential collision zone since data packets are directionally transmitted. Smart antennas are more intelligent than directional antennas ...

direct regenerations by using mature cotyledonary node as a explants has been shown to be time-saving and convenient strategy for micropropagation of soybean. so we have evaluated regeneration protocol through single shoot using cotyledonary node as a rapid and efficient protocol for two soybean cultivars and one mutant line. cotyledonary nodes explants obtained from 7-days-old in vitro seedlin...

BaCkground: The distal placement of Vascularized lymph node is an effective method in the treatment of Breast Cancer Related Lymphedema. Despite the majority of patients’ concerns are functional, some aesthetic concerns may be raised due to placement of the flap in an exposed area. Our objective is to compare the functional improvement of the lymphedematous limb after the placement of the Vascu...

BaCkground: The distal placement of Vascularized lymph node is an effective method in the treatment of Breast Cancer Related Lymphedema. Despite the majority of patients’ concerns are functional, some aesthetic concerns may be raised due to placement of the flap in an exposed area. Our objective is to compare the functional improvement of the lymphedematous limb after the placement of the Vascu...