Assumptions
We make the following assumptions about……process in this paper.
a.不考虑因素
例1:We do not take into account interactions between factors.
例2:The influence of …can be neglected
例3:…is “ideal” in …, …can be neglected.
b.为了简化模型,之后反驳不正确,但是合理。
例1:In fact (in reality)factors effect each others, but in order to simplify the model ,we ignore the interactions between factors.
例2:In fact in reality factors effect each others, but in order to simplify the model ,we ignore the interactions between factors.
c. 近似
例1:……can be approximated as a liner function of ….
例2:…are assumed to be the same. In practice, there is a slight difference.
例3:……can be approximated as a liner function of ….
d. 细致考虑(可附原因)
例1:An airport consists of 1 to 10 concourses, each of with consists of 2 to 50 gates. Gates in the same concourse are generally located close to one another, while the travel time between concourses can be quite lengthy. Hence, we assume that inter-concourse travel is much lengthier than intra-concourse travel.
例2:A average fast walking speed is 250ft/min(3mph), but average speed when arms are immobilized (as when pushing a wheelchair) is only 180 ft/min (2 mph) [Gross and Shi 2001]. We assume that an escort walks at these speeds.
例3:An escort can operate only one wheelchair at a time. U.S. Dept. of transportation guidelines discourages leaving WPs unattended. Hence, the escort takes a WP to the connecting flight and remains until the flight leaves.
e.直接定义(假设):
例1:To measure the……,we define……
例2:Yearly industry statistics can be used valid.
例3:Sth may be represented by
例4:….are independent and randomly distributed
总结:
Additional assumptions are made to simplify analysis for individual sections. These assumptions will be discussed at the appropriate locations.