the traditional approach to requirements

... Prioritize the system requirements based on the desired scope and level of automation for the new system Describe the strategic decisions that integrate the application deployment environment and the ... Three major areas to consider General requirements Technical requirements Functional requirements 18 Partial Matrix of General Requirements 19 Partial Matrix of Functional Requirements 20 Partial ... the design approach for the new system Determine alternative approaches for system development Learning Objectives (continued) Evaluate and select a development approach based on the needs and...

Ngày tải lên: 24/10/2014, 15:36

... Programmers bring cards to 1401 (b) 1401 reads batch of jobs onto tape (c) Operator carries input tape to 7094 (d) 7094 does computing (e) Operator carries output tape to 1401 (f) 1401 prints ... Description Change the working directory Change a file’s protection bits Send a signal to a process Get the elapsed time since Jan 1, 1970 Fig 1-18 Some of the major POSIX system calls The return code ... (a) Two directories before linking /usr/jim/memo to ast’s directory (b) The same directories after linking bin dev lib (a) mnt usr bin dev lib usr (b) Fig 1-22 (a) File system before the mount...

Ngày tải lên: 28/04/2014, 16:35

... power to add or detract The world will little note, nor long remember, what we say here, but it can never forget what they did here It is for us the living, rather, to be dedicated here to the ... management Pointer to text segment Pointer to data segment Pointer to stack segment File management Root directory Working directory File descriptors User ID Group ID Fig 2-4 Some of the fields of ... which they who fought here have thus far so nobly advanced It is rather for us to be here dedicated to the great task remaining before us, that from these honored dead we take increased devotion to...

Ngày tải lên: 28/04/2014, 16:35

... Cn2 Cn3 Cnm Rn1 Rn2 Rn3 Rnm Row n is current allocation to process n Row is what process needs Fig 3-6 The four data structures needed by the deadlock detection algorithm 2 1) Current allocation ... No preemption Circular wait Approach Spool everything Request all resources initially Take resources away Order resources numerically Fig 3-14 Summary of approaches to deadlock prevention ... Demonstration that the state in (a) is safe Free: (e) Has Max Has Max Has Max Has Max A A A A B B B 4 B — — C C C C Free: (a) Free: (b) Free: (c) Fig 3-10 Demonstration that the state in (b) is...

Ngày tải lên: 28/04/2014, 16:35

... bits (b) Fig 4-39 The MULTICS virtual memory (a) The descriptor segment points to the page tables (b) A segment descriptor The numbers are the field lengths Address within the segment Segment ... R bit set The numbers above the pages are their loading times A B L K C J D I E H When a page fault occurs, the page the hand is pointing to is inspected The action taken depends on the R bit: ... combinations for the terminating process, X CPU package The CPU sends virtual addresses to the MMU CPU Memory management unit Memory Disk controller Bus The MMU sends physical addresses to the memory...

Ngày tải lên: 28/04/2014, 16:35

... bitmap to fill a rectangle Copy a rectangle from one part of the frame buffer to another Convert a rectangle from television color (YUV) to RGB Fig 5-48 Messages used in the SLIM protocol from the ... 5=blinking, 7=reverse) Scroll the screen backward if the cursor is on the top line Fig 5-37 The ANSI escape sequences accepted by the terminal driver on output ESC denotes the ASCII escape character ... 10 11 12 (c) Fig 5-29 (a) A disk track with a bad sector (b) Substituting a spare for the bad sector (c) Shifting all the sectors to bypass the bad one ECC error Disk Old Disk Old Crash (a) Disk...

Ngày tải lên: 28/04/2014, 16:35

... Root directory A A B A B C C C User directory C Files Fig 6-8 A two-level directory system The letters indicate the owners of the directories and files Root directory User directory A A B B ... containing the attributes Fig 6-16 (a) A simple directory containing fixed-size entries with the disk addresses and attributes in the directory entry (b) A directory in which each entry just refers to ... Fig 6-24 A file system to be dumped The squares are directories and the circles are files The shaded items have been modified since the last dump Each directory and file is labeled by its inode...

Ngày tải lên: 28/04/2014, 16:35

... Sampling the sine wave (c) Quantizing the samples to bits Scan line The next field starts here Scan line painted on the screen Time 11 13 15 483 Horizontal retrace Vertical retrace Fig 7-5 The ... 17 18 19 20 Rank Fig 7-20 The curve gives Zipf’s law for N = 20 The squares represent the populations of the 20 largest cities in the U.S., sorted on rank order (New York is 1, Los Angeles is 2, ... Play point at 22 (e) Fig 7-16 (a) Initial situation (b) After a rewind to 12 (c) After waiting (d) After starting to refill the buffer (e) Buffer full 120 Frame Video A A Frame A Audio track T...

Ngày tải lên: 28/04/2014, 16:35

... SPARC Macintosh Network Fig 8-28 Positioning of middleware in a distributed system Computer Computer Switch Ethernet Ethernet (a) (b) Fig 8-29 (a) Classic Ethernet (b) Switched Ethernet Backbone ... (b) E F (c) Fig 8-35 (a) Two file servers The squares are 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 ... 8-9 The SMP multiprocessor model CPU Word 1000 is initially Memory CPU CPU reads a CPU reads a CPU writes a CPU writes a Bus Fig 8-10 The TSL instruction can fail if the bus cannot be locked These...

Ngày tải lên: 28/04/2014, 16:35

... vector Printer vector Sys call traps Disk vector Clock vector Printer vector Sys call traps Disk vector Clock vector Printer vector (a) (b) (c) Fig 9-15 (a) After the virus has captured all 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 it File ... security criteria The symbol X means that there are new requirements here The symbol → means that the requirements from the next lower category also apply here Client Server Collaborator Encapsulated...

Ngày tải lên: 28/04/2014, 16:35

... directory Remove a directory Create a link to an existing file Unlink a file Change the working directory Open a directory for reading Close a directory Read one directory entry Rewind a directory ... Examine or change the signal mask Get the set of blocked signals Replace the signal mask and suspend the process Send a signal to a process Set the alarm clock Suspend the caller until the next signal ... The user has hit the DEL key to interrupt the process The user has hit the key requesting a core dump Sent to kill a process (cannot be caught or ignored) The process has written to a pipe which...

Ngày tải lên: 28/04/2014, 16:35

... directory Remove an empty directory Initialize to start reading the entries in a directory Read the next directory entry Move a file from one directory to another Change the current working directory ... Set an event to signaled then to nonsignaled Release a mutex to allow another thread to acquire it Increase the semaphore count by Acquire the lock on a critical section Release the lock on a ... Open a key to get a handle to it Enumerate the subkeys subordinate to the key of the handle Look up the data for a value within a key Fig 11-6 Some of the Win32 API calls for using the registry...

Ngày tải lên: 28/04/2014, 16:35

... the chief programmer The administrator and editor each need a secretary Maintains the code and documentation archives Provides any tools the chief programmer needs Tests the chief programmer’s ... writes the code Helps the chief programmer and serves as a sounding board Manages the people, budget, space, equipment, reporting, etc Edits the documentation, which must be written by the chief ... Fig 12-8 Part of the i-node cache for Fig 6-39 Title Chief programmer Copilot Administrator Editor Secretaries Program clerk Toolsmith Tester Language lawyer Duties Performs the architectural...

Ngày tải lên: 28/04/2014, 16:35

... have a prototype, it is shown to the customer The customer verifies the prototype In case there are some suggestions from customers then again that functionality is added to the prototype and ... or manpower to build the new system Is building the new system really going to benefit the customer Does the customer have the required money to build that type of a system? All these issues ... evaluated by customer This cycle gets repeated till the time the customer is fully satisfied with the prototype Then the actual product is built The same prototype can be used for the final product...

Ngày tải lên: 27/10/2013, 23:15

... relating to this manual or the online help, please complete the questionnaire at the end of the manual and send it to the address shown Please include your own personal rating of the documentation Other ... words, all of the other OBs except OB90 can interrupt the execution of OB1 The following events cause the operating system to call OB1: • The startup is completed • The execution of OB1 (the previous ... attempted to activate a time-ofday interrupt OB, but the OB was not loaded on the CPU The operating system calls OB85 If OB85 has not been programmed (loaded on the CPU), the CPU changes to the STOP...

Ngày tải lên: 29/03/2014, 12:20

... different manner is used to store the data in memory This approach regroups the pixels for the filtering phase to reduce the off-chip memory accesses and the number of read commands on the memory address ... This, together with the DDR3 optimized burst access are the facts that drove us to look into a more efficient memory access for MC The already mentioned problems motivate us to propose a vectorized ... in the reference image there is a high overhead when retrieving useful data; • increased number of read commands on the address bus toward the memory The vectorized data storage scheme is further...

Ngày tải lên: 18/06/2014, 22:20

... different manner is used to store the data in memory This approach regroups the pixels for the filtering phase to reduce the off-chip memory accesses and the number of read commands on the memory address ... This, together with the DDR3 optimized burst access are the facts that drove us to look into a more efficient memory access for MC The already mentioned problems motivate us to propose a vectorized ... in the reference image there is a high overhead when retrieving useful data; • increased number of read commands on the address bus toward the memory The vectorized data storage scheme is further...

Ngày tải lên: 20/06/2014, 04:20

... manner is used to store the data in memory This approach regroups the pixels for the filtering phase to reduce the off-chip memory accesses and the number of read commands on the memory address ... and the request to interpredict either a certain area of the image or the full image These inputs can be provided from outside the FPGA The reference image and the MV map are written through the ... This, together with the DDR3 optimized burst access are the facts that drove us to look into a more efficient memory access for MC The already mentioned problems motivate us to propose a vectorized...

Ngày tải lên: 20/06/2014, 21:20

... calls, the HCDP for the AJCAC scheme is always less than the corresponding HCDP for the NAJCAC scheme The reason why the HCDP of the AJCAC scheme is less than the NAJCAC scheme is as follows When the ... kbps Therefore, the bandwidth adaptation affects the quality of the real-time applications rather than the transmission time However, the minimum requested QoS is maintained by ensuring that the ... QoS is better than that of the NAJCAC scheme The reason why the NCBP of the AJCAC scheme is less than the NAJCAC scheme is as follows When the total bbu al- located to new calls is being fully...

Ngày tải lên: 22/06/2014, 19:20

... trajectory controller for the DC motor The position control is carried out for a permanent magnet DC motor The motor is assumed to be a black box The load and the motor parameters are assumed to ... assumed The DC motor is identified between a set of inputs and outputs of the DC motor In the first design the inputs to the ANN are the speeds at successive time instants and the output is the motor ... the unknown system dynamics (DC motor, amplifier and load) that map the control voltage Vc to the motor speed ω As the MNN was used to identify the inverse dynamics of the system, the input to...

Ngày tải lên: 04/10/2015, 10:25