COMPOSITION FOR TREATING ALZHEIMER`S DISEASE COMPRISING AS ACTIVE INGREDIENT MIXED EXTRACT OF PINELLIA TERNATA BREITENBACH, ZIZYPHUS JUJUBA VAR. INERMIS REHDER, GLYCYRRHIZA URALENSIS FISCHER, PANAX GINSENG, ZINGIBER OFFICINALE ROSCOE, SCUTELLARIA BAICALENSIS, AND COPTIS RHIZOME