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One part of RoombaCommPanel not mentioned earlier is the playMidiNote() method. It is shown in Listing 8-5. Structurally it is very similar to the keyPressed() method of the Processing sketches in this and the previous chapter. The method accepts two parameters: a MIDI note number and a note velocity. In MIDI, note velocity is basically how loud the note should be. Because Roomba can t vary note loudness, in RoombaMidi the note velocity is mapped to note duration: a high velocity makes for a longer note. Although MIDI defines an event for both note-on and note-off messages, note-on with a zero velocity is interpreted as note-off, too. The playMidiNote() method utilizes that fact to make implementation easier. The first if() clause handles the case where the note falls within the range playable by the Roomba piezo beeper. The next if() clause turns the vacuum on or off if C0 is played. The one after that blinks all the LEDs if C#0 is played. The final two if() clauses spin Roomba left or right, for MIDI notes E0 or F0, respectively. The speed of the spin and the brightness of the Power LED are determined by the MIDI velocity.

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Earlier in this chapter, it was demonstrated how an analysis of restaurant seat turnover might indicate where the turnover could be increased. A parallel

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epidemic began among MSM, it has spread to men and women regardless of sexual orientation AIDS cases are disproportionately seen among economically disadvantaged persons in urban settings, especially among ethnic and racial minorities African Americans have been particularly vulnerable to HIV; during 1998, they represented 48% of all reported AIDS cases even though they constitute only 13% of the general population In the United States, AIDS has been identi ed as a leading cause of death among young adults (men and women aged 25 to 44 years) This age group accounts for about 70% of all deaths from HIV infection During 1994 and 1995, HIV was the leading cause of death among persons 25 to 44 years old; during 1995, HIV caused almost 31,000 deaths 19% of the total in this age group.

Subsequent improvements in the treatment of AIDS have extended life such that, by 1998, AIDS has become the fth leading cause of death among young adults, causing about 8,500 deaths, or 7% of the total Globally, the Joint United Nations Program on HIV/AIDS (2000) estimates that 343 million people are now living with HIV/AIDS (http://wwwunaidsorg) The total number of deaths since the beginning of the epidemic is estimated at nearly 19 million with 28 million people having died from AIDS during 1999 The epidemic does not appear to have slowed: It is estimated that 54 million people acquired HIV in 1999 The primary mode of transmission is believed to be heterosexual intercourse Consistent with this hypothesis, women account for 46% of AIDS cases worldwide The overwhelming majority of people with HIV live in the developing world, with nearly 24.

5 million cases on the continent of Africa, 56 million cases in south and southeast Asia, and 13 million cases in Latin America Transmission and Natural Course HIV is a uid-borne agent For HIV transmission to occur, an infected person s blood, semen, vaginal secretions, or breast milk must enter the blood stream of another person In the industrialized world, the most common routes of transmission are: (a) unprotected sexual intercourse (anal, vaginal, or oral) with an infected partner; and (b) sharing unsterilized needles (most commonly in the context of recreational drugs) with an infected person Maternal-child transmission (eg.

(5.22) (5.23)

, infection from an infected mother through the placenta before birth or through breast-feeding after birth) remains a problem in the developing world (due to poverty, lack of clean water, inadequate food supplies, and limited access to AZT and other medications), but has become less of a problem in developed.

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