Xem 1-20 trên 2886 kết quả System computer
  • Parallel Processing & Distributed Systems: Lecture 11 - Distributed System presents about Introduction, Definition of a Distributed System, Computers vs. Web Servers in the Internet, Potentials and Challenges, Transparency in a Distributed System, Scalability Problems.

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  • Single processor supercomputers have achieved great speeds and have been pushing hardware technology to the physical limit of chip manufacturing. But soon this trend will come to an end, because there are physical and architectural bounds, which limit the computational power that can be achieved with a single processor system. In this book, we study advanced computer architectures that utilize parallelism via multiple processing units.

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  • You will understand the physical meaning behind the mathematics of wireless signals and learn the intricacies and tradeoffs in signal selection and design.

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  • Medicine is, fortunately, constantly evolving. Imaging diagnosis is no exception. Technical improvements guarantee further developments in diagnosis. Computed tomography (CT) and magnetic resonance imaging (MRI) have attained a recognized value in the diagnosis of the heart, which is continuing to increase. For this reason, we have now provided a separate chapter on diagnostic imaging of the heart. We have placed sectional CT images next to MR images of the heart to facilitate classification. We have limited ourselves to scans which are presently recognized as standard.

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  • Medicine is, fortunately, constantly evolving. Imaging diagnosis is no exception. Technical improvements guarantee further developments in diagnosis. Computed tomography (CT) and magnetic resonance imaging (MRI) have attained a recognized value in the diagnosis of the heart, which is continuing to increase. For this reason, we have now provided a separate chapter on diagnostic imaging of the heart. We have placed sectional CT images next to MR images of the heart to facilitate classification. We have limited ourselves to scans which are presently recognized as standard.

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  • Linux History Design Principles Kernel Modules Process Management Scheduling Memory Management File Systems Input and Output Interprocess Communication Network Structure Security To explore the history of the UNIX operating system from which Linux is derived and the principles which Linux is designed upon To examine the Linux process model and illustrate how Linux schedules processes and provides interprocess communication To look at memory management in Linux To explore how Linux implements file systems and manages I/O devices...

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  • Background Demand Paging Copy-on-Write Page Replacement Allocation of Frames Thrashing Memory-Mapped Files Allocating Kernel Memory Other Considerations Operating-System Examples Silberschatz, Galvin and Gagne ©2005 .Objectives To describe the benefits of a virtual memory system To explain the concepts of demand paging, page-replacement algorithms, and allocation of page frames To discuss the principle of the working-set model Virtual memory – separation of user logical memory from physical memory....

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  • Basic Concepts Scheduling Criteria Scheduling Algorithms Multiple-Processor Scheduling Real-Time Scheduling Thread Scheduling Operating Systems Examples Java Thread Scheduling Algorithm Evaluation Silberschatz, Galvin and Gagne ©2005 .Basic Concepts Maximum CPU utilization obtained with multiprogramming CPU–I/O Burst Cycle – Process execution consists of a cycle of CPU execution and I/O wait CPU burst distribution Silberschatz, Galvin and Gagne ©2005 .Alternating Sequence of CPU And I/O Bursts...

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  • File Concept Access Methods Directory Structure File-System Mounting File Sharing Protection To explain the function of file systems To describe the interfaces to file systems To discuss file-system design tradeoffs, including access methods, file sharing, file locking, and directory structures To explore file-system protection .

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  • File-System Structure File-System Implementation Directory Implementation Allocation Methods Free-Space Management Efficiency and Performance Recovery Log-Structured File Systems NFS Example: WAFL File System To describe the details of implementing local file systems and directory structures To describe the implementation of remote file systems To discuss block allocation and free-block algorithms and trade-offs File-System Structure File structure Logical storage unit Collection of related information File system resides on secondary storage (disks) File system organized into...

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  • I/O Hardware Application I/O Interface Kernel I/O Subsystem Transforming I/O Requests to Hardware Operations Streams Performance Explore the structure of an operating system’s I/O subsystem Discuss the principles of I/O hardware and its complexity Provide details of the performance aspects of I/O hardware and software .I/O Hardware Incredible variety of I/O devices Common concepts Port Bus (daisy chain or shared direct access) Controller (host adapter) I/O instructions control devices Devices have addresses, used by Direct I/O instructions Memory-mapped I/O...

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  • Goals of Protection Principles of Protection Domain of Protection Access Matrix Implementation of Access Matrix Access Control Revocation of Access Rights Capability-Based Systems Language-Based Protection Discuss the goals and principles of protection in a modern computer system Explain how protection domains combined with an access matrix are used to specify the resources a process may access Examine capability and language-based protection systems

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  • The Security Problem Program Threats System and Network Threats Cryptography as a Security Tool User Authentication Implementing Security Defenses Firewalling to Protect Systems and Networks Computer-Security Classifications An Example: Windows XP To discuss security threats and attacks To explain the fundamentals of encryption, authentication, and hashing To examine the uses of cryptography in computing To describe the various countermeasures to security attacks

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  • Nowadays, embedded systems - computer systems that are embedded in various kinds of devices and play an important role of specific control functions, have permeated various scenes of industry. Therefore, we can hardly discuss our life or society from now on without referring to embedded systems. For wide-ranging embedded systems to continue their growth, a number of high-quality fundamental and applied researches are indispensable.

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  • Motivation Types of Distributed Operating Systems Network Structure Network Topology Communication Structure Communication Protocols Robustness Design Issues An Example: Networking To provide a high-level overview of distributed systems and the networks that interconnect them To discuss the general structure of distributed operating systems

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  • To provide a grand tour of the major operating systems components To provide coverage of basic computer system organization Operating System Concepts – 7th Edition, Jan 12, 2005 Silberschatz, Galvin and Gagne ©2005 .What is an Operating System? A program that acts as an intermediary between a user of a computer and the computer hardware. Operating system goals: Execute user programs and make solving user problems easier. Make the computer system convenient to use. Use the computer hardware in an efficient manner....

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  • Operating-System Structures Operating System Services User Operating System Interface System Calls Types of System Calls System Programs Operating System Design and Implementation Operating System Structure Virtual Machines Operating System Generation System Boot Silberschatz, Galvin and Gagne ©2005 .

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  • Process Concept Process Scheduling Operations on Processes Cooperating Processes Interprocess Communication Communication in Client-Server Systems Silberschatz, Galvin and Gagne ©2005 .Process Concept An operating system executes a variety of programs: Batch system – jobs Time-shared systems – user programs or tasks Textbook uses the terms job and process almost interchangeably Process – a program in execution; process execution must progress in sequential fashion A process includes: program counter stack data section...

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  • Overview of Mass Storage Structure Disk Structure Disk Attachment Disk Scheduling Disk Management Swap-Space Management RAID Structure Disk Attachment Stable-Storage Implementation Tertiary Storage Devices Operating System Issues Performance Issues Describe the physical structure of secondary and tertiary storage devices and the resulting effects on the uses of the devices Explain the performance characteristics of mass-storage devices Discuss operating-system services provided for mass storage, including RAID and HSM Overview of Mass Storage Structure...

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  • System Characteristics Features of Real-Time Systems Implementing Real-Time Operating Systems Real-Time CPU Scheduling VxWorks 5.x To explain the timing requirements of real-time systems To distinguish between hard and soft real-time systems To discuss the defining characteristics of real-time systems To describe scheduling algorithms for hard real-time systems .Overview of Real-Time Systems A real-time system requires that results be produced within a specified deadline period. An embedded system is a computing device that is part of a larger system (I.e.

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