Multi-objective group organization methods in online elderly watching system of local community

In recent years, caring for the elderly has emerged as a significant problem, and the number of elderly people living alone has also been on the rise. Against this backdrop, the authors propose a network for watching over the elderly in local communities. In this network, a group to watch over an elderly person is designed in a local community, and the watchers communicate with the elderly through messages over Online Social Networking platforms. Since several people in a group watch the elderly in this network, careful monitoring of the elderly and a reduction in the mental and physical burdens on watchers are achieved. The groups are organized per elderly person by the proposed method inspired by some Meta-Heuristic Algorithms so that the multi-objective requirements to each group, to quickly respond emergent unhealthy states of the elderly, and to notice any kinds of signs and symptoms proactively, are satisfied. Moreover, constraints to alleviate the watchers' burden are also applied as our original contribution.