Lg Chem, Ltd

Samsung Electronics Co., Ltd.

Korea Advanced Institute of Science and Technology

Dongmin Kim

Wonseok Kim

Joon Ho Shin

Seung Young Park

Kyungmin Lee

Mi Kyung Kim

Gun-Woo Moon

Wan Kyu Oh

Sae Hume Park

Kiyoung Kim

Hyunchul Jung

Yujin An

Kyeong Hwan Han

Woosung Hwang

Young-Dal Lee

Jaeil Baek

According to various embodiments, a wireless power transmission device may comprise: a coil circuit configured to generate a power signal for power transmission to an electronic device; an inverter configured to convert direct current power to alternating current power and to provide the alternating current power to the coil circuit; a coil-type detection unit comprising a coil disposed to be adjacent to the coil circuit and configured to detect a signal corresponding to the power signal; and a control circuit configured to adjust, based on the detected signal, a switching frequency of the inverter to change the alternating current power output from the inverter.

Method for performing wireless charging, wireless power transmission device, and storage medium

The present disclosure relates to a method for preparing a polyalkylene carbonate. More specifically, provided is a method for preparing a polyalkylene carbonate in which after polymerization of polyalkylene carbonate, a mixture from which unreacted carbon dioxide and residual catalyst have been removed is charged into a stripper to remove the unreacted epoxide compound, and then heat-exchanged before removing the solvent to increase the temperature of the mixture stream to the maximum level, which is subjected to a heating step, following by a solvent removal step, whereby the amount of steam required in the heating step is reduced, side reactions due to unreacted epoxide compounds are prevented, and steam energy can be reduced in the solvent removal step.

Preparation method of polyalkylene carbonate

A method for preparing an acrylonitrile dimer according to the present disclosure makes it is possible to efficiently recover an acrylonitrile dimerization catalyst while reducing the process load.

Method for preparing acrylonitrile dimer

Growing community of inventors

Daejeon, South Korea

Dongmin Kim