Meining Liu’s scientific contributions

... The objective function of this type of problems is minimizing the sum of costs of access to all resources or ∑ , where Ck is a non-decreasing discrete cost function of resource k, and capacity levels k R are obtained as decision variables through solving the model (Hartmann & Briskorn, 2010). In some studies, such as Shadrokh and Kianfar (2005), Shadrokh and Kianfar (2007), Liu et al. (2015), and Yuan et al. (2015), resource investment problem has been considered by allowing the tardiness. In this regard, if the completion time of the project is extended more than the defined deadline, penalty cost must be paid, which is added to the objective function of the problem. ...

Reference:

Resource-constrained project scheduling problem: review of past and recent developments