see strength of materialsstrength of materials, measurement in engineering of the capacity of metal, wood, concrete, and other materials to withstand stress and strain. Stress is the internal force exerted by one part of an elastic body upon the adjoining part, and strain is the deformation or change in. ..... Click the link for more information.
The Koreans are believed to have originated from ancient China. This is gathered from the archaeological and linguist evidence.
History of Korean. The Korean language is attested from the early centuries of the Common Era in Chinese characters. The Featural writing system called hangul was introduced only in the fifteenth century. The periodization of the historical stages of Korean is as follows: Before the first century: Proto-Korean.