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Temple - HUMAN BEHA - 008
PCAP Section 1 Instructions Step 1: Complete the attached questionnaire. You do not have to upload your questionnaire but after completing the questionnaire as honestly as you can, answer the following questions. Step 2: You should answer the following qu
Temple - HUMAN BEHA - 008
Jenna Anderson Section #8 PCAP 1 After taking the survey, "Communication Self Assessment", I found that I am more competent in certain sections than others. Three areas I am strongest in are 1) meeting new people and enjoying it, 2) being active in a vari
Temple - HUMAN BEHA - 008
Personal Communication Project #2 Rubric /100 points Great! (16.7-15) Good (14.9-13.3)Fair (13.2-11.6) Poor (11.5-0) Connections between chosen project and identified personal communication needs in PCAP #1Clearly identifies and explains the connection M
TAMU Commerce - HISTORY - 101
The Office of guv & State Agencies in TexasChapter 23Ch 23PS 2121 Basics of the Office Formal / constitutional power the Tex. guv is a WEAK office. For a guv to be effective: must rely on informal power of persuasion Expected (informal) Roles of the
Cal Poly Pomona - ECE - ECE320
Experiment #1 Common Emitter BJT Amplifier Executive Summary: A Common Emitter BJT amplifier is a certain kind of biased circuit where the emitter has no power source connected. In our circuit, the collector has the DC voltage to bias the circuit and the
Cal Poly Pomona - ECE - ECE320
Experiment #3 Direct-Coupled, Multistage amplifier Executive Summary: The first two stage of this multistage BJT amplifier is a voltage amplifier. The first two stages are in Common Emitter configuration. The third stage is a Common Collector configuratio
Cal Poly Pomona - ECE - ECE320
Experiment #4 MOSFET Common Source Amplifier Executive Summary: The MOSFET is a voltage controlled current source. It controls the amount of current flow through the Drain-Source by creating fields between the drain and source. The field works as a connec
Cal Poly Pomona - ECE - ECE320
Experiment #5 The Frequency Response of the Common-Emitter Amplifier Executive Summary: The frequency response of the BJT transistor was studied in this lab. We swept the input frequency of a Common Emitter configured BJT transistor from 1 Hz to 1 MHz and
Cal Poly Pomona - ECE - ECE320
Experiment #6 The Cascode Amplifier Executive Summary: In this lab, we increased the performance of the frequency response of the BJT transistor by Cascode configuration. Cascode configuration is built by combining Common Emitter and Common Base configura
Cal Poly Pomona - ECE - ECE320
Experiment #7 NMOS Logic Inverter Amplifier with Enhancement Transistor Load Executive Summary: In this lab a CD4007 was used as a load for VN106. Due to the characteristic of an enhancement mode MOSFET, it works as an inverter. The voltage that is being
Cal Poly Pomona - ECE - ECE320
Experiment #8 Multi-Stage Amplifier Design Executive Summary:The design was performed with 3 transistors: MOSFET's common source, BJT's common Emitter and a common collector. Each stage was capacitive coupled so that there is no problem with biasing the
Purdue - CS - 252
CS252 Final ReviewPlease aswer this final review and return it during the final exam. If you write down the solution in HTML and turn it in before 1:00pm the day before the final exam, you will get up to 4 extra points in the final exam. The submitted so
Purdue - CS - 252
CS252 Final ReviewPlease aswer this final review and return it during the final exam. If you write down the solution in HTML and turn it in before 1:00pm the day before the final exam, you will get up to 4 extra points in the final exam. The submitted so
Purdue - CS - 252
CS252 Final ReviewPlease aswer this final review and return it during the final exam. If you write down the solution in HTML and turn it in before 1:00pm the day before the final exam, you will get up to 4 extra points in the final exam. The submitted so
Purdue - CS - 252
CS252 Final ReviewSkyler BeckmanPlease aswer this final review and return it during the final exam. If you write down the solution in HTML and turn it in before 1:00pm the day before the final exam, you will get up to 4 extra points in the final exam. T
Purdue - CS - 252
CS252 Final ReviewPlease aswer this final review and return it during the final exam. If you write down the solution in HTML and turn it in before 1:00pm the day before the final exam, you will get up to 4 extra points in the final exam. The submitted so
Purdue - CS - 252
CS252 Final ReviewPlease aswer this final review and return it during the final exam. If you write down the solution in HTML and turn it in before 1:00pm the day before the final exam, you will get up to 4 extra points in the final exam. The submitted so
Purdue - CS - 252
CS252 Lab 1: C/C+ Programming and GDBGoalThe goal of this lab is to help you better understand both the tools that are available to you as a programmer, and the UNIX environment. A substantial part of being a good programmer is understanding the tools a
Purdue - CS - 252
CS252 Lab2 Writing a Shell Script to Automatically Backup a DirectoryGoalIn this lab you will learn shell scripting using bash.Part 1: Shell ScriptingA shell is an application program that interprets the commands that a user types and executes program
Purdue - CS - 252
CS252 Systems Programming Midterm Exam PreparationPlease write by hand the answers and turn them in the day of the exam. The solutions will be posted the day before the exam. I suggest you try to solve the questions before looking at the solution.Part 1
Purdue - CS - 252
CS252 Systems Programming Midterm Exam PreparationPart 1. True False Questions Answer True/False (T/F) (1 point each) _ ELF stands for Executable Link Format. _ A process has a stack for every thread it contains. _ A process ID may be reused _ Race condi
Purdue - CS - 252
Amy Harlan Midterm Review 1. F, T, T, T, F 2. Mode, Owners, Time Stamps, Size, Reference Count, Block Index 3. A deadlock happens when one or more threads will have to block forever (or until process is terminated) because they have to wait for a resource
Purdue - CS - 252
Matthew Sutherlin CS252 Final Review Please answer this final review and return it during the final exam. If you write down the solution in HTML and turn it in before 1:00pm the day before the final exam, you will get up to 4 extra points in the final exa
Purdue - CS - 252
1. Complete the procedure runCommand( command, outputBuffer, bufferSize) that executes a command in a different process and stores its output in outputBuffer. command is the name of the program with no arguments. See how main usesrunCommand(). runCommand
Purdue - CS - 252
CS252 Final Review1. Complete the procedure runCommand( command, outputBuffer, bufferSize) that executes a command in a different process and stores its output in outputBuffer. commandis the name of the program with no arguments. See how main uses runCom
Purdue - CS - 252
Matt Lathrop - CS 252 Practice Final Exam 1. Complete the procedure runCommand( command, outputBuffer, bufferSize) that executes a command in a different process and stores its output in outputBuffer. commandis the name of the program with no arguments. S
Purdue - CS - 252
Lab 5: Building a HTTP ServerIMPORTANT: Your web server should be able to serve HTTP files only. You will not need to implement the directory listing and CGI-bin like it has been done in previous semesters.Purpose of the LabThe objective of this lab is
Purdue - CS - 252
The ShellIntroductionThe goal of this project is to build a shell interpreter like csh. The project has been divided in several parts. Some sources are being provided so you don't need to start from scratch.Using the DebuggerIt is important that you l
Purdue - CS - 252
Lab4: Introduction to ThreadsGoalIn this lab you will be introduced to thread programming and to the need for mutualexclusion when more than one thread is used.Part 1: Thread Creation1. Copy the file lab4-src.tar.gz to your directory, uncompress it an
Purdue - CS - 252
Lab6 : Voice Over IP Using AndroidGoalIn this lab you will write an application that will allow communicating two or more phones running Android over the Internet. You will work on teams of 2 to 5 students.Making the TeamsMake your teams and e-mail to
Purdue - CS - 354
A Synchronized List ClassWe want to implement a List class where remove() will block if the list is empty. To implement this class, we will use a semaphore "_emptySem" that will be initialized with a counter of 0. Remove() will call sema_wait(&_emptySem)
Purdue - CS - 354
Adding a new System CallYou will need two new system calls and also export the sys_call_table. We explain here how to add a simple system call. You can see a tutorial in how to do this in: Here is a summary of the steps.http:/macboypro.wordpress.com/200
Purdue - CS - 354
4. Allocate zero-initialized memory. It is used to allocate space for bss, stack and sbrk() When allocating memory using sbrk or map with the MMAP_ANON flag, all the VM pages in this mapping will map to a single page in RAM that has zeroes and that is r
Purdue - CS - 354
Allocation Algorithm1.Round up requested size to the next 8 byte boundary (if size =0 assume 1 byte data) Add the size of the header and the footer:real_size = roundup8(requested size) + sizeof(header) + sizeof(footer)2.3.Lookup the corresponding li
Purdue - CS - 354
RPC- Remote Procedure CallApplications of Semaphores: Remote Procedure CallAssume we have two threads: A client and a server thread. A client threadfills up some arguments and wakes up a server thread. The client waits until the results from the serv
Purdue - CS - 354
Applications of Semaphores: N- joinAssume N threads will block when calling njoin() until n threads call njoin().njoin()N-JoinClass NJoin cfw_ int _n; int _ncurrent; mutex_lock _mutex; sema_t _sem; public: NJoin(int n); void join(); ; NJoin:NJoin(int
Purdue - CS - 354
Applications of ThreadsConcurrent Server applicationsAssume a web server that receives two requests: First, one request from a computer connected through a modem that will take 2 minutes. Then another request from a computer connected to a fast network
Purdue - CS - 354
AtomicityAtomic Section:A portion of the code that only one thread should execute at a time while the other threads have to wait. Otherwise corruption of the variables is possible. An atomic section is also called sometimes a "Critical Section"Mutex Lo
Purdue - CS - 354
Backing StoreEvery page in the address space is backed by a file in disk, called backingstore Memory Section Backing StoreText Data Executable File Executable File when page is not not modified. Swap space when page is modified Swap Space Swap Space Swa
Purdue - CS - 354
Block DevicesBlock device - transfers blocks of data (e.g., Disk device) Commands: read, write, seek (if random access device)1/31/121Character Devices Character device - transfers byte by byte (e.g., Keyboard) Commands: get, put one character Libra
Purdue - CS - 354
Boundary TagsBoundary Tags allow identifying the neighboring objects in O(1). This allows coalescing of objects in O(1) Each object allocated or free has a header and a footer. The header and the footer contain the size of the object as well as a flag th
Purdue - CS - 354
Bounded Buffer in JavaImplement a BoundedBuffer class to communicate producer and consumer threads using a cicular buffer. Similar to the BoundedBuffer class with Semaphores and Cndition VariablesBounded Buffer in JavaBoundedBuffer.java: class BoundedB
Purdue - CS - 354
Bounded Buffer with Condition Variables#include <pthread.h> enum cfw_MaxSize = 10; class BoundedBuffercfw_ int _queue[MaxSize]; int _head; int _tail; int _n; mutex_t _mutex; cond_t _emptyCond; cond_t _fullCond; public: BoundedBuffer(); BoundedBuffer:Boun
Purdue - CS - 354
Bounded BufferAssume we have a circular buffer of a maximum fixed size. We want multiple threads to communicate using this circular buffer. It is commonly used in device drivers and in pipes._head_tailBounded BufferThe queue has two functionsenqueue
Purdue - CS - 354
Building a Program The programmer writes a program hello.c The preprocessor expands #define, #include, #ifdef etc preprocessor statements and generates a hello.i file. The compiler compiles hello.i, optimizes it and generates an assembly instruction lis
Purdue - CS - 354
Building your own KernelIn the Linux Kernel 2.6 and above, the system call table is not exported. Also, the size of the system call table is fixed and cannot be expanded from a KLM (Kernel Loadable Module) You will need to modify and build your own kerne
Purdue - CS - 354
clone() and fork()Clone and fork create a new task. clone Creates a new task using the same memory mapping and file descriptors of the parent task. Used to create a new thread in the same process. fork Creates a new task using a copy of the memory mappin
Purdue - CS - 354
Computer Architecture ReviewMost modern computers use the Von Newman Architecture where both programs and data are stored in RAM. A computer has an address bus and a data bus that are used to transfer data from/to the CPU, RAM, ROM, and the devices. The
Purdue - CS - 354
CS354: Operating SystemsGustavo RodriguezRiveraComputer Science Department Purdue UniversityGeneral InformationWeb Page: http:/www.cs.purdue.edu/homes/cs354 Office: LWSN1169 E-mail: grr@cs.purdue.edu Textbook: Silberschatz, Galvin and Gagne. Operati
Purdue - CS - 354
A directory is a file that contains a list of pairs (file name, I-node number) Each pair is also called a hard-link An I-node may appear in multiple directories.Directory Representation and Hard Links The reference count in the I-node keeps track of t
Purdue - CS - 354
Disk OrganizationDisk surfaceCircular disk coated with magnetic materialTracksConcentric rings around disk surface, bits laid out serially along each trackSectorssectorEach track is split into arc of track (min unit of transfer)11/31/12More on D
Purdue - CS - 354
Disk SchedulingWhich disk request should the OS service first?FCFS Shortest seek time first Elevator (SCAN) LOOK C-SCAN (Circular SCAN) C-LOOK1 1/31/12Looks familiar?FIFO (FCFS) orderMethodFirst come first serve053199ProsFairness among reques
Purdue - CS - 354
DL MallocThe memory allocator you are building is based on Doug Lea's malloc implementation that is public domain: This allocator is the standard allocator in Linuxhttp:/g.oswego.edu/dl/html/malloc.htmlMemory Allocation ErrorsExplicit Memory Allocatio
Purdue - CS - 354
Explicit Memory ManagementIn explicit memory management a program frees objects by calling free/delete explicitly The program uses a "malloc library" usually provided by the C standard library libc. Memory is requested from the OS and added to a free lis
Purdue - CS - 354
External FragmentationExternal Fragmentation is the waste of memory in the free list due to small noncontiguous blocks that cannot satisfy a large request. 40 64 160x110p = malloc(100);0x40000x8000100 bytes object + 8 bytes header = 108 bytes total
Purdue - CS - 354
Fence PostsIf the object freed is at the beginning of the heap, it is likely that your allocator will try erroneously to coalesce memory beyond the beginning of the heap. Also other libraries may call sbrk() causing a hole in the heap.Fence PostsTo pre
Purdue - CS - 354
File Operationsstruct file_operations cfw_ struct module *owner; loff_t(*llseek) (struct file *, loff_t, int); ssize_t(*read) (struct file *, char _user *, size_t, loff_t *); ssize_t(*aio_read) (struct kiocb *, char _user *, size_t, loff_t); *); ssize_t(
Purdue - CS - 354
Heap CheckYou can implement also a heapCheck function that checks for the sanity of the heap and prints the free and allocated blocks. You can call it during debugging before and after suspicious free/malloc calls. Starting from the header at the beginni
Purdue - CS - 354
How does VMs work?They use "Trap" and "Emulate" A processor can be virtualized if all instructions that access a privileged state cause a trap or interrupt.Trap = interruptThe VM will catch the trap and emulate what the OS in that VM tries to do.Memor
Purdue - CS - 354
Implementation of LRUTo implement LRU we would need to have a timestamp in each page to know when was the last time page was accessed. This timestamp is approximated using the accessed and modified bits.Clock Algorithm (Second Chance Algorithm)Initiall
Purdue - CS - 354
Implementation of PagingPaging adds an extra indirection to memory access. This indirection is implemented in hardware, so it does not have excessive execution overhead. The Memory Management Unit (MMU) translates Virtual Memory Addresses (vmaddr) to phy