Pages 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 18215 result(s) returned

2.4 Using search engines

Search engines can be very good at finding information since they cover such a huge number of web pages. Unfortunately it can be difficult to find the one you want in the huge number of hits that they return. I can illustrate some of the problems, and some of the strategies you can use to overcome them, with an example.

Let's assume a friend of yours, Jill, has heard you talking about ‘Living with the Net’ and is trying to find out more about the course. What problems might Jill fac
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2.1 Introduction

In this section we will cover the following topics:

  • browsing for information on the Web;

  • searching for information on the Web;

  • using search engines;

  • bookmarking websites;

  • finding images on the Web;

  • how to reference sources.

Some of the material in this section has been drawn from Safari, an interactive website provided by the Open University Library.
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1.1 What this unit is about

In this unit you will be looking at information that can be found on the Web. You may already have explored the Web and discovered what an enormous amount of information it contains. Alternatively you may be a newcomer to the Web. Either way, this unit will help you to develop your skills in accessing online information.

Here are some things that I regularly use the Web for:

  • Finding phone numbers

  • Getting train times and booking
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Acknowledgements

Except for third party materials and otherwise stated (see terms and conditions), this content is made available under a Creative Commons Attribution-NonCommercial-ShareAlike 2.0 Licence

Grateful acknowledgement is made to the following sources for permission to reproduce mater
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References

AIM (N.D.) What is Radio Frequency Identity (RFID)? [Online] Association for Automatic Identification and Mobility. Available from http://www.aimglobal.org/technologies/rfid/what_is_rfid.asp [Accessed 18 October 2006]
Gates, W.H. (1996) The Road Ahead, England, Penguin Books Ltd., pp. 250–1
Hecht, J. (2004) ‘Casinos lead the chip revolution’, The New
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8.1 Introduction

This section continues with the work started in Section 7. Here you will build on your research to look at some recent applications of RFID and some of the issues surrounding its deployment.


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7.6 Researching information about RFID tags

Activity 32: exploratory

What is the smallest RFID tag currently available? Use the Web to see what you can come up with but don't spend longer than 10 minutes on this activity. (Hint: using ‘smallest RFID tag’ as the search term wo
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7.5 Active and passive tags

Activity 30: exploratory

Read the extracts below. Using the information they contain, make notes about the main differences between active and passive RFID tags. You will get more out of this exercise if you make a serious attempt to do
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7.3 RFID technology

There are three main components in an RFID system:

6.8 Drawbacks of living in a smart home

One of the issues I thought about was privacy. How would the elderly or infirm feel about being monitored in their own homes? How would teenage children at home feel about being under the constant eye of their parents?

I also thought about security. Would it be possible for a hacker to break into my smart home network – possibly to disable intruder alarms and open doors to allow themselves entry? A malicious hacker might also alter control settings to cause havoc – turning devices o
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6.7 Benefits of living in a smart home

I can think of a number of possible benefits – apart from the obvious one about relieving me of the tedium of performing a lot of routine tasks. The first one I thought about was the potential saving in energy the technology could bring – for instance by switching off devices (TV, radio, hifi, heaters, lights) when there's no one there to use them.

The second advantage I thought about was the potential for independence that smart home technology could provide for the elderly or infi
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6.4 Signal accuracy

In the Networked microsensors and the end of the world as we know it article, the author talks about sensors being able to link the ‘world of events’ with the ‘electronic world of computers, processes and storage devices […] by integrating analogue sensing with digital processing […]’ (Shepherd, 2003).

In the physical world, events usually take place as an ever-changing continuum. Time passes, the seasons change, temperatures fluctuate and water reservoirs fill and dr
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6.2 Devices in the home

Activity 24: exploratory

Take a mental ‘walkthrough’ of a typical morning in your own home, making a note of all the events and activities that involve electrical devices!

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5.6 Reliability and usability

In this context we will define reliability as the ability of a technology to perform its intended function, without failure, under stated conditions and for a stated period of time. It is beyond the scope of this unit to provide a detailed comparison of the reliability of WiFi and Bluetooth – we simply want to alert you to some of the issues. Broadly these are:

  • What is the likelihood of data errors being introduced during transmission?


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5.5 Security

Because wireless signals travel in free space, they can be picked up by any device in range equipped with a suitable radio receiver. This has implications for the security of data on a wireless network, as it could be accessed by outside devices. Both WiFi and Bluetooth are equipped to address this problem by a combination of authentication and encryption. Authentication is a method of controlling access to the network so that only recognised devices are accepted. This can be done usin
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5.1 Introduction

In many situations, more than one technical solution is possible. It could be that none of them provides a completely ideal solution; each is likely to have its own merits and drawbacks, and often a compromise has to be made. This section is about comparisons. First we ask you to make a comparison between the two wireless technologies introduced in Author(s): The Open University

4.9 Bluetooth

The driving force for the development of the Bluetooth standard was to eliminate the need for connecting wires between local ICT devices such as keyboards, monitors, printers, PDAs (Personal Digital Assistants), cell phones and headsets. This was already possible using infrared technology, but the requirement for line-of-sight positioning between the communicating interfaces limits infrared's usefulness. Because Bluetooth uses radio waves, Bluetooth devices can communicate with each other wit
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4.8 WiFi – a summary

Activity 18: self-assessment

To test your understanding of what you have read so far about WiFi, say whether each of the statements below is true or false.

  1. In ad hoc mode, WiFi stations are connected
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3.3 Wired network configurations

Network nodes can be connected together in different arrangements known as topologies. We are going to describe four common topologies that you may come across.

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