Proposed presence system for safety confirmation

The registration process stores presence information in the presence server, which includes ID for authorization, registered date and time, and location. The reference process loads the presence information using the ID as a search key. Safety confirmation service registers a user´s presence and refers to his/her friend´s presence. However, existing systems require separate operations for registration and reference. Users need to enter their telephone number as an ID during the registration process and their friend´s telephone number as an ID during the reference process. As a result, many steps are required for registration and reference operations. We therefore propose two methods to reduce the number of steps. The presence update method registers the card ID, location of card reader, date, and time by just swiping a contactless smart card through a card reader. The presence migration method from an external Social Networking Service (SNS) selects the place, date, and time in the external SNS using an email address. Both these methods are invoked by swiping the contactless smart card through the card reader, the registration and reference operations of presence information are executed at the same time. Using a prototype system that implemented these methods, we confirmed that the initial values can be obtained from external SNSs and many users can quickly register and refer safety information.