Write a lab report about the Fomite Transmission LabPaq experiment i.pdf

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The document describes the difference between direct and indirect disease transmission. Direct transmission requires physical contact between an infected and healthy person, while indirect transmission does not involve direct contact but rather spreads through contaminated surfaces. It provides the examples of HIV spreading through sexual contact as direct transmission, and common colds or tuberculosis spreading via contaminated objects as indirect transmission.

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Write a lab report about the Fomite Transmission LabPaq experiment in which you do the
following: 1. Describe the difference between direct and indirect transmission. a. Describe one
example of direct transmission. b. Describe one example of indirect transmission.
Solution
1). Transmission by direct contact requires the physical contact between the infected person and
the healthy person. In contrast, indirect transmission does not involve direct physical contact, but
the pathogens pass on to the surfaces touched by the person. When the healthy person tough
these contaminated surfaces, the organism enter into the healthy person.
a). An example of direct transmission is, the transmission of HIV (human immunodeficiency
virus), which causes AIDS (acquired immuno deficiency syndrome). It is a sexually transmitted
disease. It can also be indirectly transmitted via contaminated needles, but sexual contact is the
most common way of transmission.
b). The transmission of common cold and tuberculosis can occur by indirect contact in which the
organism pass via the contaminated objects or surfaces.

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Consider the following interrupting system. The active-edge inputs on PJ7 and PP7 can occur at any time, including at the same time. The object is to count the number of each type of interrupt. How would you best describe the usage of Count in this system? a) This is a perfectly appropriate usage of Count, because there are two permanently allocated variables with private scope, such that each variable counts the number of interrupts for each ISR. b) There is a critical section bug because of the read/modify/write access to a shared global. c) Because both ISRs share the same Count, the system can not distinguish between a PJ7 and a PP7 interrupt. d) Count is initialized each interrupt, so its value is not the total number. e) The acknowledge statements in the two ISRs are not friendly because they affect all 8 bits of the flag register. f) None of the above is true. void interrupt 24 KeyHanJ (void) ( unsigned short static Count-0; PIFJ = 0x80; // acknowledge Countt count the number of PU7 edges void interrupt 56 KeyHanP (void) ( unsigned short static count=0; PIFP = 0x80; // acknowledge Count++count the number of PP7 edges Solution Looking around, we find ourselves to be surrounded by various types of embedded systems. Be it a digital camera or a mobile phone or a washing machine, all of them has some kind of processor functioning inside it. Associated with each processor is the embedded software. If hardware forms the body of an embedded system, embedded processor acts as the brain, and embedded software forms its soul. It is the embedded software which primarily governs the functioning of embedded systems. During infancy years of microprocessor based systems, programs were developed using assemblers and fused into the EPROMs. There used to be no mechanism to find what the program was doing. LEDs, switches, etc. were used to check correct execution of the program. Some ‘very fortunate’ developers had In-circuit Simulators (ICEs), but they were too costly and were not quite reliable as well. As time progressed, use of microprocessor-specific assembly-only as the programming language reduced and embedded systems moved onto C as the embedded programming language of choice. C is the most widely used programming language for embedded processors/controllers. Assembly is also used but mainly to implement those portions of the code where very high timing accuracy, code size efficiency, etc. are prime requirements. Initially C was developed by Kernighan and Ritchie to fit into the space of 8K and to write (portable) operating systems. Originally it was implemented on UNIX operating systems. As it was intended for operating systems development, it can manipulate memory addresses. Also, it allowed programmers to write very compact codes. This has given it the reputation as the language of choice for hackers too. As assembly language programs are specific to a processor, assembly language didn’t offer portability across systems. To overcome this disadv.

Consider the following interrupting system. The active-edge inputs o.pdf

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