加拿大科学论文代写：计算机科学
加拿大科学论文代写：计算机科学
IOS：iOS的内核架构与Android相似。有一个内核环境、核心服务、应用程序服务和实际应用程序[ 1 ]。OS X的更新再造OS的苹果产品，多任务的环境中创建。在以前的Mac OS 9中，当一个进程不合作时，所有进程的响应都会受到损害。另一方面，在OS X中，进程在一个3 GB的环境中被分配了自己的地址空间。
安卓：Android系统架构具有Linux内核，具有显示驱动、闪存、电源管理、摄像机驱动等功能。然后是带有Android运行时核心库和虚拟机的库层。应用程序框架是架构中的下一层，它包含活动、窗口管理器、包管理器、资源管理器和更多模块。应用程序位于这个体系结构栈的最高层，具有不同的类型和用途，如即时消息、照相机、日历、媒体等等。
Windows Mobile：Windows Mobile最初基于Windows NT [ 2 ]的内核。在系统架构层的底层是电话的低层硬件交互驱动程序，称为BSP的板级支持包。BSP是由CPU上工作的同一个供应商编写的。在BSP上是核心服务，然后是应用程序服务和应用程序。
内部特征：安全性
iOS：iOS系统具有严格的安全政策虽然支持一定程度的用户访问和透明度（比彻et al，2011）。最安全的特点是加密到操作系统和安全软件是非常紧密连接的硬件和软件之间。只有违反引导内核，才会出现严重的安全漏洞，但紧密耦合使这几乎不可能。此外，应用程序在一个安全沙箱中运行，这给了它更多的保护。
安卓手机给用户更多的使用自由和增强的范围。用户将能够为他们设置访问权限。数据安全功能再次加密到内核和应用程序沙箱也跟着来了，对于应用层的安全。
加拿大科学论文代写：计算机科学
iOS: The kernel architecture of the iOS is similar to that of the Android. There is a kernel environment, core services, application services and the actual application [1]. With OS X being the newer reengineered OS for Apple products, a preemptive multitasking environment is created. In the previous Mac OS 9 when one process does not cooperate then the responsiveness of all processes will be compromised. On the other hand, in OS X, processes are assigned own address space within a 3 GB environment . iOS: The kernel architecture of the iOS is similar to that of the Android. There is a kernel environment, core services, application services and the actual application [1]. With OS X being the newer reengineered OS for Apple products, a preemptive multitasking environment is created. In the previous Mac OS 9 when one process does not cooperate then the responsiveness of all processes will be compromised. On the other hand, in OS X, processes are assigned own address space within a 3 GB environment . Android: The Android System architecture has a Linux kernel with the necessary functions for the display drivers, flash memory, power management, camera driver and others. Then there is a libraries layer with the Android runtime core libraries and the Virtual machine. An application framework is the next layer in the architecture with the activity, window manager, package manager, resource managers and more modules. Applications are at the top most level of this architectural stack and are of different types and uses, such as Instant Messaging, camera, calendar, media and more. Windows Mobile: The Windows Mobile was originally based on the kernel of Windows NT [2]. At the bottom of the system architectural layer is that of the low level hardware interaction drivers for the phone, called as the board support package of the BSP. BSP is written by the same vendors that work on the CPU. On the BSP are the kernel services and then are the application services and applications .
Internal Features: Security iOS: The iOS system has a stricter security policy although supporting some level of user access and transparency (Becher et al, 2011). Most security features are encrypted into the OS and the security software is very tautly connected between hardware and software. Only by breaching the boot kernel, will there be serious security breach but the tight coupling makes this near impossible. Furthermore the apps run in a security sandbox which gives it more protection. Android: The Android phone gives its user more freedom of use, and enhanced scope. The user will be able to set access permissions as is needed for them. Data security features are once again encrypted into the kernel, and application sandboxing is also followed here, for application level security.
