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Assumptions

引出：

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

dierence.

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.

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