课程名称︰作业系统 课程性质︰系必修 课程教师︰薛智文 开课学院：电机资讯学院 开课系所︰资讯工程学系 考试日期（年月日）︰2012/1/12 考试时限（分钟）：180 是否需发放奖励金：是 （如未明确表示，则不予发放） 试题 : This is an open-book and open-own-note exam. Please do answer with your own SUCCINCT words in the order of question number in EXACTLY one given answer sheet for LESS THAN 10 (个人注：此指 ≦ 10 lines) lines per question. Provide your own question definition if you fell it is not clear enough. Points will be deducted if your answer is difficult to read or exceed length limitation. You can write in Chinese and keep this paper. Good luck. 1. To design a virtual memory for a hypervisor (virtual machine monitor) so that it can provide different memory pages dynamically for many virtual machines simultaneously according to the also dynamic needs from users, what kinds of needs users night require? [5%] What page replacement policy you will adopt? And why? [10%] What new memory design problems might occur? [5%] 2. For a multimedia (video-on-demand, on-line shopping ...) system, how to design your disk system to be both efficient and read-time? [20%] 3. System security is a tradeoff of time to break. List two system security problems that can be improved, and how to improve, with the same user satisfaction of convenience. Hint: define your own convenience. [20%] 4. People complain that the Taipei MRT (捷运) 淡水-新店 line will be divided into two lines to distribute the load of Taipei main station. What and how technical (not politic) computer system problems we can improve to reduce the complaint? [25%] Hint: reduce waiting time, system complexity might be increased, fault tolerance ... 5. To design a storage system where our course metarials including lecture notes, projects, forum ... can be accessed friendly, anytime, anywhere, that means it can be accessed on-line, off-line, under failure, convenient, low cost, and ... Would it be stateful or stateless? File-based or database-based? Naming? Security? Synchronization? Replica? Consistency? Other issues? List as many issues, reasons, and solutions as you can under length limitation accoroding to that cost is the most important concern. [25%] --

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