Abstract: A battery pack includes a battery module configured to accommodate a number of battery cells, and a lower protective cover including a lower panel detachably coupled to a lower portion of the battery module and a number of buffer parts on one surface of the lower panel. A structure of the lower protective cover of the battery pack may be improved to absorb an impact from a lower side of a vehicle. A cross-sectional shape of the buffer part of the lower protective cover may be changed to adjust and design an impact absorption value.

Abstract: A composition including a fermented propolis extract as an active ingredient and a method of preparing same. The composition including a fermented propolis extract as an active ingredient, according to the present invention, can be used for various applications such as improvement in skin wrinkles or skin elasticity, skin whitening, skin moisturizing, and skin antioxidant or anti-inflammatory applications. In addition, the composition can exhibit stronger effects due to the content of artepillin C that is increased by a preparation method according to the present invention.

Abstract: A convection oven includes an oven body having a heating chamber heated by a heat source, and a vibration unit mounted at one side of the oven body and vibrating heated air so as to be uniformly distributed within the heating chamber. As the vibration unit vibrates, air within the heating chamber can be fluctuated periodically to promote mixing between more heated air and less heated air to make temperature of air uniform. Accordingly, heat can be uniformly distributed to a cooking target or material, quality of cooking can be improved, and in addition, because cooking time can be shortened, the performance of the oven can be enhanced.

Abstract: A convection oven includes an oven body having a heating chamber heated by a heat source, and a vibration unit mounted at one side of the oven body and vibrating heated air so as to be uniformly distributed within the heating chamber. As the vibration unit vibrates, air within the heating chamber can be fluctuated periodically to promote mixing between more heated air and less heated air to make temperature of air uniform. Accordingly, heat can be uniformly distributed to a cooking target or material, quality of cooking can be improved, and in addition, because cooking time can be shortened, the performance of the oven can be enhanced.