The drill string of ERW is taken as research object, the dynamic problem is brought forward during making hole, and the mechanics model about each dynamic action is established.
以大位移井钻柱的部分或整体为研究对象，提出了钻井各种动态问题，建立了钻柱的各种动态行为的力学模型。
The conception and method of online scheduling in parcel post automated warehouse are put forward, that is dynamic scheduling problem, which is equal to solve online traveling salesman problem.
提出了邮包自动化仓库在线调度的概念和方法，即动态调度问题，实际上等同于解决在线旅行商问题。
The problem was formulated along with the proposal of the dynamic group, namely how to achieve perfect revocation and forward security.
随着动态群的提出，这一问题也逐渐被规范化，即如何实现群成员的完美撤销和签名的向前安全。
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