linux administration a beginners guide 6 pdf

... Trang 1TE AMTrang 2UNIX System Administration: A Beginner’s Guide Trang 3This page intentionally left blank.Trang 4UNIX System Administration: A Beginner’s Guide Steve Maxwell McGraw-Hill/Osborne ... 0-07-219486-3 All trademarks are trademarks of their respective owners Rather than put a trademark symbol after every occur-rence of a trademarked name, we use names in an editorial fashion only, and to the ... Sun, and IBM John is also a Cisco CCIE (CCIE #5162), MCSE, and MCNE He has published papers in several leading technical journals, such as Element K and SysAdmin, and has served as a technical

Ngày tải lên: 20/10/2022, 10:46

... The PicBasic Pro compiler is considerably more expensive than the standard PicBasic compiler. The Pro version offers an enhanced and richer basic command syntax than is available in the PicBasic compiler package. A few of the addition­ ... programming and sensory electronics we can create a zoo of robots that includes photovores, behavior­based (neural) robots, hexapod and bipedal walkers, and artificial vision systems that can track and follow objects ... While the PicBasic Pro is a more sophisticated package, the compiler does not handle two of my favorite Basic commands, peek and poke. Although the commands are listed as “functional” in the Pro manual, it is emphasized that “PEEK and POKE should never be used in a PicBasic Pro program.” There are

Ngày tải lên: 10/08/2014, 04:22

... Drill and hammer Self­explanatory A well­stocked hardware store will carry the simple metalworking tools out­ lined Most will also carry the light­gauge sheet metal and aluminum bar materials needed to make the chassis ... 32­in aluminum bar (see Fig 8.26) The aluminum bar is marked at the center Each bend required in the bumper is also marked in pencil The material is placed in a vise at each pencil mark and bent to the angle required ... bearing needs to be removed so that you can cut away the stop tab from the gear Use a hobby knife or miniature saw to cut away the stop tab When you are finished cutting off the tab, check that the cut surfaces are smooth

Ngày tải lên: 10/08/2014, 04:22

... changes and correct the transition automati- cally.  e added eff ects appear as yellow Eff ect bars and a message appears in the Heads-Up Display (HUD) to let you know that Flash Catalyst has added ... compression format for Flash Player 6 and 7. • MP3 is a standard fi le format on the Internet and on many portable digital audio players. • Advanced Audio Coding (AAC) is a standardized encoding ... some cases, making changes to objects that are currently part of a transition can negatively aff ect the appearance of the transition. Flash Catalyst adds additional “helper” eff ects to adjust

Ngày tải lên: 08/08/2014, 20:20

... -p16f84 wink.bas The compiler reads the text file and compiles two additional files, an .asm (assembly language) and a .hex (hexadecimal) file. The wink.asm file is the assembly language equivalent ... book). Additional components are required in Chap. 6: (1) Solderless breadboard RadioShack PN# 276-175 (1) 0.1-F capacitor RadioShack PN# 272-1069 (8) Red LEDs RadioShack PN# 276-208 (8) ... battery clip RadioShack PN# 270-325 Available from RadioShack, Images SI Inc., Jameco Electronics, and JDR Microdevices (see Suppliers). *These resistors are also available in 16-pin dip package.

Ngày tải lên: 10/08/2014, 04:22

... you have an ac adapter for the EPIC programmer board, plug it into the board. If not, attach two fresh 9-V batteries. Connect the “battery on” jumper to apply power. The programming board must ... end of book). This page intentionally left blank. [...]... automatically  initiated  the macroassembler  to compile  the assembly code to machine language hexadecimal code The hex code file is ... command is c:/applics>pbp ­p16f84 wink.bas.) The compiler displays an initialization copyright message and begins process­... Either name may be used; they  are  both  correct A computer  may  contain  up  to four  parallel 

Ngày tải lên: 10/08/2014, 04:22

... and port B (RB0–RB7) of the 16F84 The board may also be used with the 16F8X, 16C55X, 16C62X, 16C7X, and 16C8X family of 18­pin PIC microcontrollers Its 168­point solderless connection area allows for quick and easy access to ... The PicBasic and PicBasic Pro compilers can send and receive serial information at 300, 1200, 2400, and 9600 Bd Data are sent as 8 bits, no parity, and 1 stop bit The serial mode may be set to be true or inverted These data match the serial communication protocols required of the LCD ... The four sockets aligned in each individual column are electrically connected The individual columns are separate electrically from one another Bank 3 is the same as bank 2 Trang 12Figure 6.11 Photograph of PIC Experimenter’s Board with breadboarding area and 18­pin socket

Ngày tải lên: 10/08/2014, 04:22

... ister. To accomplish this, we look at the bit weights associated with each line. RB2 has a bit weight of 4, and RB6 has a bit weight of 64. We add these num- bers (4  64  68) and write that number ... closed, it’s equal to binary 0. The command peek is followed by a memory address, then a comma, then a storage variable. peek address, var As its name implies, the peek command allows one to ... Figure 6.22 Diagram of port A registers. 69 70 Chapter Six Here’s another example. Let’s configure port B so that bit 0 (RB0) is an input pin and all other pins are output lines. To place binary

Ngày tải lên: 10/08/2014, 04:22

... Since the resistance value of the CdS cells can vary so greatly, it’s a good idea to buy a few more than you need and measure the resistances, to find a pair whose resistances are close There are a few ways you can measure the resistance ... The CdS photoresistors have large variances in resistance between cells It is useful to use a pair of CdS cells for this robot that matches, as best as one can match them, in resistance Since the resistance value of the CdS cells can vary so greatly, ... This will ensure that the robot will steer forward right and left Trang 26-32 brass nut6-32 nuts Upper bracket Wire 6-32 plastic machine screw Robot base Base Figure 8.31 Side dimensional detail (robot base side of the bump switch) of plastic screw

Ngày tải lên: 10/08/2014, 04:22

... for this robot that matches, as best as one can match them, in resistance Since the resistance values of the CdS cells can vary so greatly, it’s a good idea to buy a few more than you need and measure the resistances to find a ... 16This page intentionally left blank Trang 1710 Chapter Hexapod Walker Legged walkers are a class of robots that imitate the locomotion of animals and insects, using legs Legged robots have the potential to transverse rough ... 9.18) used in this robot have a dark resistance of about 100 k� and a light resistance of 10 k� The CdS photoresistors typically have large variances in resistance between cells It is useful to use a pair of CdS cells

Ngày tải lên: 10/08/2014, 04:22

... The back servomotors are attached to the aluminum body using plastic 6­32 machine screws and nuts The reason I used plastic screws is that the plas­ 4 Trang 6tic is a little flexible, allowing the drilled holes to be slightly off­center from ... the servomotors The battery pack is a 16­V unit using four AA batteries The microcontroller circuit may also be built on a small printed­circuit board that is available from Images SI Inc (see Fig ... make sure that each leg can swing forward and backward an equal amount from a perpendicular position Leg positioning The legs must be positioned accurately, or the walking program will not cause the hexapod robot to walk properly

Ngày tải lên: 10/08/2014, 04:22

... is available as a kit from Images SI Inc. You can purchase the main components , HM2007, SRAM, and printed-circuit boards separately if you like and build from scratch. The kit takes a modular ... Software Approach Currently most speech recognition systems available today are software pro- grams that run on personal computers. The software requires a compatible sound card be installed ... modular approach and uses three separate printed-circuit (PC) boards. The three PC boards are the main circuit board containing the speech recognition circuit, digital display board, and keypad

Ngày tải lên: 10/08/2014, 04:22

... Next we require two more A bracket components One A bracket com­ ponent has a servomotor horn attached to its bottom holes, and the other A bracket component has a servomotor attached and is laid on its back as a base ... described the basic function of a servomotor; now we will review in a little greater detail Servomotors are geared dc motors with a positional feedback control that allows the shaft (rotor) to be rotated and positioned accurately ... this as a position error and will increase its torque in an attempt to rotate the shaft back to its command position Hobby servomotor specifications usually state that the shaft can be posi­ tioned through a minimum range of 90° (±45°) In reality this range can be

Ngày tải lên: 10/08/2014, 04:22

... Base Servomotor blocks A and B Baseplate Base sides A and B Trang 183­in­square bearing Top bearing plate 1­in­diameter � 0.40­in wood dowel Plastic machine screws and nuts, wood screws Available from Images SI Inc ... (1) 0.1­�F, 50­V capacitor 5­V dc power supply Kit available from Images SI Inc (see Suppliers) Trang 19Chapter 13 Bipedal Walker Robot In this chapter we will construct and program a bipedal walking robot (see Fig ... Star Wars film(s) will suffice Nature has evolved a three­jointed leg for most walking animals Although it may appear that our robotic leg has four joints, because it has four servo­ motors, it is essentially a three­jointed leg

Ngày tải lên: 10/08/2014, 04:22

... Hence we need the three subroutines to handle the motion ‘Bipedal walker program ‘Declare variables x1 var byte x2 var byte y1 var byte y2 var byte lp var byte Trang 10‘Initalize array variables start: ‘Holding loop that holds upright position 3 seconds before moving ... 13.4 and 13.5 I glued rubber gas­ ket material to the bottom of the plastic footpad to make the pad nonskid The footpads provide a larger surface area that makes it easier for the biped to balance and walk ... zero weight on a leg, we don’t need to perform an A/D conversion to read vary­ ing pressure (weight) Instead we can use an op­amp and comparator The op­ amp converts the resistance change in the sensor to an electric change

Ngày tải lên: 10/08/2014, 04:22

... serial cable to the CMU camera (see Fig. 14.5). Connect a DB-9 pin serial cable from the PC to the camera. Start the program. Set the program’s baud rate to match the CMU camera’s baud rate. ... calibrate the camera’s field of view. The target is a 2.5-in square of orange paper (see Fig. 14.8), held at a distance of 12 in from the camera lens. I also used this target to read the image ... compiler auto- matically adjusts the serial commands to keep the baud rate accurate. Program 1 This first program establishes a communication link between the CMU cam- era and PIC 16F84 microcontroller.

Ngày tải lên: 10/08/2014, 04:22

... (see Suppliers at end of book) Trang 2This page intentionally left blank Trang 3Images SI Inc 109 Woods of Arden Road Staten Island, NY 10312 (718) 698­8305 (718) 982­6145 (fax) www.imagesco.com Jameco Electronics ... has twice as much memory (2048 bytes) Latest updates and information on the CMU camera can be found at http://www.cmucam.com or http://www.cmucamera.com Parts List CMU camera (2) Servomotors (HS­425) (2) Servomotor wheels ... 104–106 speech interface control circuit, 173–176 drive/steering motors, 90 Stand­alone servomotor bracket assembly, 191 parts list, 123–124 Standard­based expert programming, 83–86 photographs of finished product,

Ngày tải lên: 10/08/2014, 04:22

... of 22 Major Arcana (orpicture) cards and 56 Minor Arcana cards The Major Arcana cards are numbered 0–21 Each card has a title such as the Fool or theWorld, for example The Major Arcana cards describe ... card describes a man (and occasionally a woman) of a fiery nature If they are Caucasian they are likely to have blue or grey eyes and red to brown hair If they aren’t Caucasian, this card can ... most appropriate course of action in a given situation, so wedon’t have to repeat our lessons again and again The above saying reminds us that we are allrepeating lessons and that we all have

Ngày tải lên: 17/02/2016, 14:19

... tables for NFS and e-mail aliases.) The only limitation is that each NIS map can have only one key, and the database mechanism doesn’t scale well beyond about Red Hat Linux Administration: A ... tools, and so forth. More formally, such packages are called distributions. You may have heard of the Linux distributions named Red Hat, SuSE, Mandrake, and Caldera, which have received a great deal ... other names for a profit (and can in turn be resold again . . .). In the end, what makes a package from one person more valuable than a package from another person consists of the value-added features,...

Ngày tải lên: 24/04/2014, 09:18

... range. n The allocated memory cannot be used before it is allocated or after it is deallocated. Because dynamic memory allocation and deallocation occur at runtime, static program analysis rarely ... mtrace command, analyze the memory allocations and deallocations to ensure that they match. % mtrace my_program $MALLOC_TRACE The messages produced by mtrace are relatively easy to understand. ... 1 && array_index < array_size) deallocate (&(array[array_index])); else error = 1; break; case ‘r’: fgets (command, sizeof (command), stdin); if (sscanf (command, “%u %i”, &array_index,...

Ngày tải lên: 21/01/2014, 07:20