Samsung Electronics Co., Ltd.

Korea Institute of Science and Technology

Woo-Suk Jung

Chong Yun Kang

Ji-Won Choi

Seok Jin Yoon

Jin Sang Kim

Seong Keun Kim

Seung Hyub Baek

Beomjin Kwon

Disclosed is a curved piezoelectric device maximizing an electrical potential of the piezoelectric material corresponding to an external mechanical stress. The curved piezoelectric device includes: a curved substrate; and a piezoelectric material provided on one surface or both surfaces of the curved substrate, wherein when a stress is applied, a neutral plane in which a compressive stress and a tensile stress are balanced is located in the curved substrate, wherein the location of the neutral plane is determined by yand yof Equation 1 or 2 below, and wherein the location of the neutral plane is controllable by adjusting a thickness (d), a sectional area (A) and a Young's modulus (E) of each of the curved substrate and the piezoelectric material: wherein 

Curved piezoelectric device

A method of requesting emergency rescue in a mobile communication terminal having a Bluetooth device. The method comprises the steps of: computing position information of the terminal in case of emergency; switching into a sleep mode after computing the position information of the terminal; transmitting an emergency-informing packet containing the position information into the Bluetooth device after switching into the sleep mode; and executing by the Bluetooth device communication with another nearby Bluetooth device.

Method of requesting an emergency rescue in a mobile communication terminal having a bluetooth device

Growing community of inventors

Seoul, South Korea

Woo-Suk Jung