论文代写：为西北铁路SRS测试用例文档和计划
重要的设计假设将这里提到。例如对一些设计假设列车跟踪系统是重要条件跟踪系统中已经实现或这些系统的安全完好无损虽然有些漏洞被发现。为每个假设会有适当的讨论为什么假设是必要的,在这个报告中假设达到什么目的。
这里使用的一些关键设计的假设是:
•火车的名字被认为是只用于显示的背景下,将没有功能的实现。这是因此多余的标识符
•第二跟踪系统的主要假设是,每个不需要验证的输入和输出,这里没有检查构造为确保有输入和输出的一致性。输入和输出是假定为符合要求的格式。
•第三个假设是,区域标识符是独一无二的,这可能并非如此。实时可能有重叠的区域。重叠区域的存在甚至可能影响列车的数量可能会通过。但是这个项目不承担任何重叠的区域,因此这就意味着探测器将首先检查是否一个区域是免费的,如果它不是那么它将检查火车区。它不会检查火车延伸到另一个区。
•实时也是明智的检查火车在一个区域是否会传递到另一个区域。这将有助于跟踪实时发布的区域。但这里的假设是有足够的释放两个区域之间的距离或时间,这将在现实世界中几乎是不可能的。
•较小的相互依赖关系被假定,在真实世界场景中会有更多的依赖关系,因此需要一个更复杂的结构。
论文代写：为西北铁路SRS测试用例文档和计划
The important design assumptions will be mentioned here. Some design assumptions for instance with respect to the tracking system would be that the pre-requisites for train tracking are already implemented in the system or the security of these systems are intact although some vulnerabilities have been traced. For each of the assumption there will be a proper discussion on why the assumption is necessary and what purpose the assumption achieves in this report.
Some of the key design assumptions that are used here are:
- The train name is considered only for the context of display purposes and will have not functional implementation. This is hence a redundant identifier
- The second main assumption here is that each of the tracking systems need not validate the input and output, here there are no checks constructed for ensuring there is input and output consistency. The input and output are assumed to be consistent with the required format.
- The third assumption is that the zone identifiers are unique, this might not be the case in real time. In real time there could be overlapping zones. The presence of overlapping zones might even impact on the number of trains that could cross through. However this project assumes no overlapping zones and hence this would mean that the detector will first check if a zone is free, if it is not then it will check for the train on that zone. It will not check if the train extends into another zone.
- In real time it would also be wise to check for whether a train in one zone would pass into another zone next. This would help to keep track of real time release of the zones. However here the assumption is that there is enough release distance or time between two zones, which would practically be impossible in real world.
- Lesser interdependencies are assumed, in real world scenario there would be more dependencies and hence a more complex structure would be required.
