Lambda Innovision Inc.

Kakao Corporation

Ji Eun Choi

Jong Pil La

Jin Woo Choi

Yang Kyun Park

Yu Mi Kim

Dong Ho Shin

Hyun Hee Park

Seung Uk Seo

June Seong Joe

Ji Hye Choe

Seung Jin Park

Doo Wahn Park

Won Muk Kim

Disclosed are a device and system for detecting ground subsidence by using a LiDAR technology. The system for detecting ground subsidence, which detects whether the ground has subsided within an area where the subsidence of the ground will be examined includes at least two reflection units installed in a structure disposed within an area where the subsidence of a ground will be examined and each configured to reflect light incident thereon, and a LiDAR device disposed within a preset radius from the structure and configured to detect whether the ground has subsided and the extent of the ground subsidence based on a distance difference between the LiDAR device and each of the reflection units.

System for detecting ground subsidence using LiDAR technology

A laser generation apparatus includes a light source making oscillate a laser having a frequency based on the amount of current applied thereto, a splitter ramifying a laser incident thereon at a preset ratio, an interference system receiving the ramified laser, generating an interference signal by ramifying a laser incident thereon, and measuring the phase of a laser oscillated, a temperature adjustment unit uniformly maintaining a temperature of a part of the interference system, an error integrator receiving a signal that has undergone the interference system and accumulating a phase error occurred, a phase error detection unit detecting a phase difference between the signal of the error integrator and an offset current value, a driving driver applying a current to the light source, and a control unit controlling an operation of each component and controlling the driving driver based on results of the detection of the phase error detection unit.

Optical frequency stabilization apparatus for narrow spectral linewidth laser generation

A message service providing method for a message service linked to a search service and a message server and a user terminal for performing the method are disclosed. The message service providing method includes identifying an instant message input through a message input box of a message application switching from a chat mode to a search mode or a suggested search word selected from suggested search words in a suggested search word list displayed in conjunction with the message input box, transferring, to a search server, a search request for a search word including a whole or a portion of the identified instant message or suggested search word in response to a user input provided to the message application, receiving search result data derived through the search word.

Message service providing method for message service linked to search service and message server and user terminal to perform the method

Growing community of inventors

Hwaseong-si, South Korea

Ji Eun Choi