A lot of work has been done towards the higher security of information system, and many mature information system prototypes have been developed.

长期以来，人们针对信息系统的安全问题作了大量研究，已经有许多成熟的信息系统安全模型。

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For instance, discoveries made relatively early in the development cycle, while analyzing system or subsystem prototypes, can easily require significant modifications to the system architecture.

例如，在分析系统或子系统原型时，在开发周期的相对早期进行的发现，可以比较容易地要求对系统架构的重大修改。

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The objectives of these prototypes are to mitigate key technical risks and clarify stakeholders' understanding of what the system should do.

这些原型的目标是减少主要的技术风险和澄清项目涉众对系统应该做什么的理解。

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The competition is asking for prototypes of a badge system.

FORBES: Why Get a Pricey Diploma When a Bleepin' Badge Will Do?

The prototypes have a unique intelligent navigation system which enables them to plot their own course.

BBC: Mars robots begin test campaign

Like most prototypes, the the SWAN (System for Wearable Audio Navigation) is pretty bulky in its current form, with a laptop, GPS, inertial sensors, pedometer, RFID tags, RF sensors, a compass, and other gear all stuffed into a backpack, although they're apparently already working on a smaller version.

ENGADGET: SWAN: System for Wearable Audio Navigation