Tham khảo tài liệu 'sustainable rfid solutions part 10', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 214 Sustainable Radio Frequency Identification Solutions Warshall algorithm which returns the distance to be traversed to reach the destination and the next-hop reader ID along the shortest path. 3. With the next-hop reader ID the system queries the hash for the currfid nxthoprfid tuple to get the directionid which is sent to the display device associated with the currfid for display purposes. Thus the user can navigate to the direction of the next hop reader and repeat the scan process unless he reaches the destination of interest. The display device also shows how far the user is from the destination. 5. Deployment For deployment we chose the third floor of the PKI Peter Kiewit Institute building at UNO University of Nebraska at Omaha . The RFID readers and LCD displays were located at different points and marked on the map. Then we generated the test scenarios to verify the shortest path to the destination. We believe our map of critical interest is similar to a mazelike hospital building. We identified four locations on the floor as our primary points of interest. There is an information desk that would require the patients to scan their tags and express their point of interest. The information desk can be attended by a staff member or remain unattended at the cost of the user submitting their destination of interest from a scroll on a PC. This information is required by the central server for computation of the shortest path and the next destination. On computation the server sends the direction information to the display device and the user follows the direction. Fig. 4. PKI third floor map for deployment. RFID-based Direction Finding Signage System DFSS for Healthcare Facilities 215 As the users follow the direction specified and reach intermediate readers the central station will be able to monitor and track the users as shown on the screen snapshot in Figure 4. This could help the staff monitor and track the patients. We believe this will be extremely .
