Each ZigBee reader is located in a piece of office equipment (computer). ZigBee Reader: These are ZigBee devices that are used to detect the presence of a user. It is connected to the server by a serial port, and receives signals from each of the ZigBee tags in the system. ZigBee Coordinator: A ZigBee device responsible for coordinating the other ZigBee devices in the office. Data base: The system uses a data base, which stores data related to the users, sensors, computer equipment and status, and user profiles. These agents are responsible for requesting the profile role adapted for the user. Clients: These are user agents located in the client computer and are responsible for detecting the user with ZigBee technology, and for sending the user’s identification to the manager agent. The agent functions were originally implemented with a traditional server. The components used in the system are: Server: The primary system agents are deployed on this device: the manager agent, which manages communication and events and the profile manager agent, which is responsible for managing user profiles. Figure 2 displays the basic operation of the proposed system. Thus, when a user tag is sufficiently close to a specific terminal, the reader can detect the user tag and immediately send a message to the ZigBee network coordinator. Every user in the proposed system carries a Zigbee tag, while a ZigBee reader is located in each system terminal. This allows an individual to be identified, and for different actions to be performed on the computer, thus facilitating workplace integration: automatic switch on/off of the computer, identifying user profile, launching applications, and adapting the job to the specific needs of the user. The main goal of the system is to detect the proximity of a person to a computer using ZigBee technology. This document presents a proximity detection system that will be used by people with disabilities to facilitate their integration in the workplace. The infrastructure of the proposed system is dynamic, adaptable, scalable, non-intrusive, and has a low operation cost. One of the main advantages of this system is that, as opposed to GPS type systems, it is capable of functioning both inside and out with the same infrastructure, which can quickly and easily adapt to practically any applied environment. Furthermore, ZigBee incorporates an additional network with security and application layers under the IEEE 802.15.4 standard, and allows more than 65,000 connected nodes. The IEEE 802.15.4 standard is designed to work with low rate networks with limited resources.
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