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Principles of security and crime prevention, 4th ed. Cincinnati, OH: Anderson Publishing. Friedman. …… Private SecurityThe various factors that influence both the definition and the perception of private security are typically environmental but can be internal and external to the issue of security itself. In most developed nations, the state provides security forces that are paid for by tax payers local, municipal, state and federal police, and military forces; however, private security forces, typically operated by ex military officers who bring their training and experience into the private sector to fill gaps in the market where demand cannot be satisfied by state security apparatuses alone, do exist and do operate both in developed and developing nations. Private security contractors like Academi, GRS, and Aegis look like military forces and often work with military forces when political factors require governments to apply to them for assistance as has been the case with the U.

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More advanced home alarm systems may also contain vibration sensors to detect when glass has been broken by measuring the vibrations caused by the breakage. Also, many systems use motion sensors that compute the proximity of a room’s walls by producing infrared beams and measuring the time required for them to bounce back; if a beam comes back sooner than expected, it likely bounced off of a person and the sensor registers motion. The control center keeps track of the status of the sensors and reports activity through LCD displays and other output devices. Moreover, when activity takes places, such as the opening of a window, the sensors report the activity to the control center and the center registers that a disturbance has occurred. In managed alarm systems, the control panel also checks the sensors to verify that they are still operational; if a sensor fails to reply, the center alerts the home owner of an out of order sensor. If the home owner activates the alarm system and the control center registers activity in the home, a signal is sent by the control to a buzzer, flashing lights or any other audiovisual alarm element. Our design for a functional keypad was the usage of an alternation of ports between inputs and outputs which is done by using the TRIS function. We started off by setting the first four ports of PORTB as the inputs and the latter four ports as the outputs. The first four ports are connected to the columns meanwhile the last four are connected to the rows. Moreover, as a justification for this reasoning is the fact that it is required to scan the columns for the pressed key and then scan the rows and the results will be decoded in a decoder telling us which button of the keypad was pressed. The main functionality of the keypad as mentioned earlier is to set the code.