Wang P.,Chifeng College Chifeng
Applied Mechanics and Materials | Year: 2013
The PERT network diagram optimization and the node layout optimization were studied in order to solve the difficulty of using manual methods to generate the PERT network chart in large-scale software project management. The new methods of optimization the node of PERT was proposed based on ant colony optimization algorithm (ACO) and genetic algorithms (GAs). The high adaptability and population optimization technology of GAs are discussed and also the ACO is introduced to realize the nodes layout global adjustment. In the end, calculation and simulation results show that the methods proposed can make the number of nodes of PERT network diagram generated automatically minimum. Meanwhile, it can make the layout of nodes of PERT network diagram more efficient and effective, so as to effectively solve the large-scale software project assessment problem. © (2013) Trans Tech Publications, Switzerland.
Liu T.-Z.,Chifeng College Chifeng |
Tian H.-M.,Chifeng College Chifeng
Mycotaxon | Year: 2010
The new species Podosphaera setacea on Crataegus sanguinea (Rosaceae) in China, intermediate between species of Podosphaera sect. Podosphaera and sect. Sphaerotheca, is described, illustrated, and compared with the morphologically similar species Podosphaera tridactyla, P. ferruginea and P. spiraeae. A new record for China, Erysiphe buhrii, is recorded on the new host species Stellaria dichotoma var. lanceolata.