The aim of this article is to display common trends and design approaches in iPhone app design - please notice that they are not necessarily optimal ones from the design or usability point of view.

本文的宗旨是阐明苹果手机应用软件设计的共同趋势和设计方法。请注意，这些共同趋势和设计方法从设计或者实用性的角度来看未必最优。

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From the engineering point of view, a design method for single input optimal regulator with preassigned closed-loop pole by inverse problem approach has been derived.

给出了从逆问题指定闭环极点设计最优调节器的方法，试图从工程角度解决单输入线性定常系统最优调节器的极点配置问题。

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Finally, we then from the engine management point of view, analyze the technical issues and solutions in selecting an optimal ship operational speed.

最后从轮机管理的角度出发，分析选择最佳经济航速运行时，存在的技术问题及相应的对策。

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