Background：Aging has become an issue that is attaching more and more importance to all countries in the world.
By the end of 2017, the population of people aged 65 and over was 158.31 million, accounting for 11.4% of the total population.
The rapid growth of the aging population has brought a heavy burden on the elderly in various countries in the world and brought unprecedented pressure on all countries.
The trend of family size in modern society is that of a transition from a large family to a small family. The ensuing problem is that the demand for social services for the elderly will continue to grow.
Many elderly care service names are confused and cause nursing difficulties.
For example, cleaning services and sanitation services are the two services that can be naturalized into a type of service to solve the problem of the messy names of service items in the field of elderly services.
Problem:A.At present the names of elderly service items in the elderly care industries at home and abroad are verified and named according to the actual conditions, leading to many irregularities in the names of many elderly service items. And the same service may have a variety of names and they all belong to the elderly services, what’s more, each service may belong to a small category.
B. Manual definitions are often inefficient, require a lot of time and manpower, and may be personally emotional.
Hypothesis:Use a semi-automatic method of constructing an ontology of elderly services based on hierarchical clustering to solve the problem of messy names of aged care services
Method:ways to construct an ontology: Skeleton method; IDEF5; TOVE;METHONTOLOGY;KACTU engineering method ; SENSUS; the seven-step method.