hardware system software and networks
slike bài giảng ứng dụng xây dựng hệ thống thông tin chương 8 evaluating alternatives for requirements, environment, and implementation
Ngày tải lên :
24/10/2014, 15:36
... of: Computer hardware System software Networks Development Tools Existing environment generally considered and compared with proposed environment Hardware, System Software, and Networks Older ... Compatibility with system requirements Compatibility among hardware and system software Required interfaces to external systems Conformity with IT strategic plan and architecture plans Cost and schedule ... Application deployment environment Computer hardware, systems software, and networks in which new system will operate Determines constraints imposed on system development alternatives Analyst must...
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A computer system consists of hardware, system programs, and application programs figs 1
Ngày tải lên :
28/04/2014, 16:35
... Banking system Airline reservation Web browser Compilers Editors Command interpreter Application programs System programs Operating system Machine language Microarchitecture Hardware Physical ... Physical devices Fig 1-1 A computer system consists of hardware, system programs, and application programs Card reader Tape drive Input tape Output tape Printer 1401 (a) System tape (b) 7094 (c) (d) ... program and data Registers when program is running Limit-2 User-2 data Base-2 Limit-2 Limit User program and data Base Base-2 User-1 data Limit-1 Base-1 User program Limit-1 Base-1 Operating System...
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A computer system consists of hardware, system programs, and application programs figs 2
Ngày tải lên :
28/04/2014, 16:35
... Processes n–2 n–1 Scheduler Fig 2-3 The lowest layer of a process-structured operating system handles interrupts and scheduling Above that layer are sequential processes Process management Registers ... Finite-state machine Characteristics Parallelism, blocking system calls No parallelism, blocking system calls Parallelism, nonblocking system calls, interrupts Fig 2-12 Three ways to construct ... process All systems Fairness - giving each process a fair share of the CPU Policy enforcement - seeing that stated policy is carried out Balance - keeping all parts of the system busy Batch systems...
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A computer system consists of hardware, system programs, and application programs figs 3
Ngày tải lên :
28/04/2014, 16:35
... (m) (n) A B C A B C A B C R S T R S T R S T (o) (p) (q) Fig 3-4 An example of how deadlock occurs and how it can be avoided R A B C S D F U W G (a) T E D V U R E V G (b) Fig 3-5 (a) A resource ... Fig 3-13 (a) Numerically ordered resources (b) A resource graph Condition Mutual exclusion Hold and wait No preemption Circular wait Approach Spool everything Request all resources initially Take...
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A computer system consists of hardware, system programs, and application programs figs 4
Ngày tải lên :
28/04/2014, 16:35
... Time C B C C B B C C B A A A A D D D Operating system Operating system Operating system Operating system Operating system Operating system Operating system (a) (b) (c) (d) (e) (f) (g) Fig 4-5 Memory ... Operating system in ROM User program User program User program Operating system in RAM Operating system in RAM (a) (b) (c) Fig 4-1 Three simple ways of organizing memory with an operating system and ... physical memory To allow programs and data to be broken up into logically independent address spaces and to aid sharing and protection Fig 4-37 Comparison of paging and segmentation ; ;; ; ;;;;...
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A computer system consists of hardware, system programs, and application programs figs 5
Ngày tải lên :
28/04/2014, 16:35
... executed when the print system call is made (b) Interrupt service procedure User-level I/O software Device-independent operating system software Device drivers Interrupt handlers Hardware Fig 5-10 ... handlers Hardware Fig 5-10 Layers of the I/O software system User process User program User space Rest of the operating system Kernel space Printer driver Hardware Printer controller Camcorder driver ... device-independent I/O software Operating system Disk driver Printer driver Keyboard driver (a) Operating system Disk driver Printer driver Keyboard driver (b) Fig 5-13 (a) Without a standard driver...
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A computer system consists of hardware, system programs, and application programs figs 6
Ngày tải lên :
28/04/2014, 16:35
... within each record Number of bytes in the key field Date and time the file was created Date and time the file was last accessed Date and time the file has last changed Number of bytes in the ... one segment and creating a new segment for file xyz Root directory A A B C Fig 6-7 A single-level directory system containing four files, owned by three different people, A, B, and C Root directory ... directory system The letters indicate the owners of the directories and files Root directory User directory A A B B B C B B C C C C User subdirectories C C Fig 6-9 A hierarchical directory system...
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A computer system consists of hardware, system programs, and application programs figs 7
Ngày tải lên :
28/04/2014, 16:35
... multimedia and high-performance I/O devices Note that Mbps is 106 bits/sec but GB is 230 bytes Frame English subtitles Hello, Bob Hello, Alice Nice day Sure is How are you Great And you Good ... Fiber Junction box Distribution network Video server Cable TV coaxial cable (b) Fig 7-1 Video on demand using different local distribution technologies (a) ADSL (b) Cable TV Source Mbps Telephone ... 15 483 Horizontal retrace Vertical retrace Fig 7-5 The scanning pattern used for NTSC video and television Y 640 I 320 240 RGB 640 240 480 480 8-Bit pixel Block (a) 24-Bit pixel Block 4799...
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A computer system consists of hardware, system programs, and application programs figs 8
Ngày tải lên :
28/04/2014, 16:35
... Run-time system Run-time system Run-time system Run-time system Run-time system Run-time system Operating system Operating system Operating system Operating system Operating system Operating system Hardware ... system Hardware Hardware Hardware Hardware Hardware Hardware Shared memory Shared memory Shared memory (a) (b) (c) Fig 8-22 Various layers where shared memory can be implemented (a) The hardware (b) ... directories and the circles are files (b) A system in which all clients have the same view of the file system (c) A system in which different clients may have different views of the file system Client...
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A computer system consists of hardware, system programs, and application programs figs 9
Ngày tải lên :
28/04/2014, 16:35
... readable output Mandatory access control Subject sensitivity labels Device labels Accountability Identification and authentication Audit Trusted path Assurance System architecture System integrity ... the interrupt and trap vectors (b) After the operating system has retaken the printer interrupt vector (c) After the virus has noticed the loss of the printer interrupt vector and recaptured ... the end (d) With a virus spread over free space within the program Operating system Operating system Operating system Virus Virus Virus Sys call traps Disk vector Clock vector Printer vector...
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A computer system consists of hardware, system programs, and application programs figs 10
Ngày tải lên :
28/04/2014, 16:35
... write, and execute Owner and group can read, write, and execute Owner can read and write; group can read Owner can read and write; all others can read Owner can everything, rest can read and execute ... Page cache Terminal handing Raw tty Character devices Network device drivers Disk device drivers Hardware Fig 10-3 Structure of the 4.4BSD kernel Process Signal creation and handling termination ... Examples of remote mounted file systems Directories are shown as squares and files are shown as circles Client kernel Server kernel System call layer V- node Virtual file system layer Local FS Local...
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A computer system consists of hardware, system programs, and application programs figs 11
Ngày tải lên :
28/04/2014, 16:35
... USER Description Properties of the hardware and software Hardware description and mapping of hardware to drivers Security and account information for users System- wide security policies Generic ... OS HAL + OS HAL + OS System data System data System data Process A's private code and data Process B's private code and data Process C's private code and data GB GB Bottom and top 64 KB are invalid ... objects FileSystem File system driver objects and file system recognizer objects Security Objects belonging to the security system KnownDLLs Key shared libraries that are opened early and held open...
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A computer system consists of hardware, system programs, and application programs figs 12
Ngày tải lên :
28/04/2014, 16:35
... Event-driven code Layer System call handler File system File system m Virtual memory Driver Driver Driver n Threads, thread scheduling, thread synchronization Interrupt handling, context switching, ... modules Test system Dummy procedure Dummy procedure Dummy procedure Deploy (a) (b) Fig 12-10 (a) Traditional software design progresses in stages (b) Alternative design produces a working system (that ... Toolsmith Tester Language lawyer Duties Performs the architectural design and writes the code Helps the chief programmer and serves as a sounding board Manages the people, budget, space, equipment,...
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System Analysis and Design - Complete Introductory Tutorial for Software Engineering
Ngày tải lên :
27/10/2013, 23:15
... characteristics and various types of Information systems You would also be able to understand the system development process 1.1 What are Systems? To understand System Analysis and Design, one ... understand What exactly System Analysis and Design is.? Who is system analyst and what are his various responsibilities? Users of the Systems? 11 1.8 What is System Analysis and Design? System development ... components: systems analysis and systems design.In System Analysis more emphasis is given to understanding the details of an existing system or a proposed one and then deciding whether the proposed system...
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SIEMENS - simatic system software for S7-300/400 system and standard functions pot
Ngày tải lên :
29/03/2014, 12:20
... (STL) for S7-300/400 manuals • Standard and System Functions for S7-300/400 iv Part of the STEP Standard software System Software for S7-300/400 System and Standard Functions A5E00261410-01 Preface ... OB40 Hardware interrupt 16 OB41 Hardware interrupt 17 OB42 Hardware interrupt 18 OB43 Hardware interrupt 19 OB44 Hardware interrupt 20 OB45 Hardware interrupt 21 OB46 Hardware interrupt 22 OB47 Hardware ... OB35_DATE_TIME DATE _AND_ TIME DATE _AND_ TIME of day when the OB was called System Software for S7-300/400 System and Standard Functions A5E00261410-01 1-13 Organization Blocks 1.6 Hardware Interrupt...
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Báo cáo sinh học: " Novel data storage for H.264 motion compensation: system architecture and hardware implementation" pdf
Ngày tải lên :
18/06/2014, 22:20
... reused and only one memory access will provide both Cb and Cr at the same time System architecture and hardware implementation Further, the Block level architecture that was conceived for the hardware ... image sizes and frame rates The hardware implementation of a stand alone H.264 q-pel MC on FPGA has shown speeds between 95.9 fps for HD1080p frames, 229 fps for HD 720p and between 2502 and 12623 ... frames) The performance in a system using both P and B frames will be lower than in a system that only uses P frames A system that can perform the proposed method on P and B frames is reserved for...
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báo cáo hóa học:" Novel data storage for H.264 motion compensation: system architecture and hardware implementation" doc
Ngày tải lên :
20/06/2014, 04:20
... reused and only one memory access will provide both Cb and Cr at the same time System architecture and hardware implementation Further, the Block level architecture that was conceived for the hardware ... image sizes and frame rates The hardware implementation of a stand alone H.264 q-pel MC on FPGA has shown speeds between 95.9 fps for HD1080p frames, 229 fps for HD 720p and between 2502 and 12623 ... frames) The performance in a system using both P and B frames will be lower than in a system that only uses P frames A system that can perform the proposed method on P and B frames is reserved for...
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Báo cáo toán học: " Novel data storage for H.264 motion compensation: system architecture and hardware implementation" pot
Ngày tải lên :
20/06/2014, 21:20
... reused and only one memory access will provide both Cb and Cr at the same time System architecture and hardware implementation Further, the Block level architecture that was conceived for the hardware ... MT41J64M16LA-187E Zhou D, Liu P: A hardware- efficient dual-standard VLSI Architecture for MC Interpolation in AVS and H.264 1-4244-0920-9 IEEE International Symposium on Circuits and Systems, ISCAS 2007 Zhang ... Science and Technology in Flanders (Agentschap voor Innovatie door Wetenschap en Technologie in Vlaanderen) for funding the Vampire project and Alcatel Lucent-Bell (ALU) for financial and technical...
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Báo cáo hóa học: " Research Article Adaptive Bandwidth Management and Joint Call Admission Control to Enhance System Utilization and QoS in Heterogeneous Wireless Networks" pptx
Ngày tải lên :
22/06/2014, 19:20
... cellular networks Therefore, this paper models and analyzes a JCAC algorithm in heterogeneous cellular networks We propose adaptive bandwidth management and JCAC (AJCAC) scheme to enhance system ... least the minimum bandwidth needed Handoff calls are prioritized over new calls by using different call rejection thresholds for new and handoff calls, and also by using different bandwidth adaptation ... (4) Available bandwidth O E Falowo and H A Chan B1 = t21 B2 = t22 t11 RAT t12 t02 t01 RAT Access networks Figure 4: Accessible bandwidth for a two-class, two-RAT system where λn and λh denote...
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DC motor position and speed tracking (PAST) system using neural networks
Ngày tải lên :
04/10/2015, 10:25
... modeling and control of nonlinear dynamic systems Hiroaki and Mitsuo (1990), Psalitis et al., (1990) and Weerasooriya and Shirkawi (1991) used artificial neural networks for identification and control ... DC Motor Position and Speed Tracking (PAST) System Using Neural Networks 26 Chapter 3: Position and Speed Tracking (PAST) System CHAPTER Position and Speed Tracking (PAST) System 3.1 Introduction ... reference DC Motor Position and Speed Tracking (PAST) System Using Neural Networks 27 Chapter 3: Position and Speed Tracking (PAST) System adaptive control system and the calculation speed of...
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