By Smeds B.
A brand new plotter for not easy reproduction color demonstrate of electronic computing device outputs hasbeen constructed. The plotter makes use of 3 depth modulated ink jets with thecolours crimson, yellow and blue, which plot the data on an ordinary A four paper(210 × 297 mm) mounted to a rotating drum. The ink jets are separately controlledfrom a magnetic tape unit that is loaded with a tape ready via thecomputer. the whole plotting time is eighty five seconds self sufficient of the complexityof the image t~ be plotted. the full info contents plotted in a single 85second run is bits.
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Additional resources for A 3-Colour Ink Jet Plotter for Computer Ggaphics
We encounter macro files with such programs as Microsoft Word, Microsoft Excel, and Lotus 1-2-3. Strictly speaking, macros are executable files. They are actually executed by another program — Excel, Word, etc. However, during the execution, they behave as if they were the executing program. Thus, it is possible to execute a virus and, perhaps, to replicate it. TYPES OF VIRUSES There are several types of viruses. In general, we see the following: • • • • • • • • • File infector Resident program infector Boot sector infector Multi-partite virus Dropper Stealth virus Companion virus Polymorphic virus Mutation engine We will discuss each of these virus types in turn.
However, when the damage occurs on the victim’s computer, trapping and convicting the intruder are much more difficult. If the intruder attacks a computer and never downloads any data, it may be difficult to prove that he or she was actually the one who did the damage. The problem is that there may or may not be a residue of the intrusion on the hacker’s computer. It is possible that a forensic examination of the computer will bear fruit for the investigator, but it is more likely that methods of tracking the intruder over the network will be successful.
This includes the mechanisms for doing damage, how the code is spread, and how and why the attacker may leave malicious code in a system after an attack. As we discussed in an Chapter 2, one of the most prevalent types of computer attack is denial of service. Many intruders, especially those who are not technically capable of performing sophisticated intrusions, choose to cause damage rather than attempt other forms of attack. Relatively speaking, damage and denial of service attacks are simple compared to other more sophisticated intrusions.
A 3-Colour Ink Jet Plotter for Computer Ggaphics by Smeds B.