National Institute of Meteorological Research

Sapphire Technology Co., Ltd.

Hee Choon Lee

Kyu Young Choi

Kwang Deuk Ahn

Yong Hee Lee

Sung Hwan Moon

Jong Chul Ha

Gye Won Jang

Bok Kee Na

Yi Sik Choi

Provided is a sapphire single crystal heat treatment method comprising the steps of: charging a sapphire single crystal into a chamber; raising the temperature in the chamber to a target temperature by heating the chamber; holding the temperature in the chamber at a constant temperature; and cooling the inside of the chamber to room temperature, wherein the temperature raising step comprises: a first temperature raising step of raising the temperature to a first set temperature at a temperature raising rate of 4&#xb0; C./min to 5&#xb0; C./min; and a second temperature raising step of raising the temperature to a second set temperature at a temperature raising rate of 1&#xb0; C./min or less after the first temperature raising step has been completed. The temperature raising process is executed in a multi-stage, to reduce the temperature raising time and prevent a sapphire single crystal from being affected by heat.

Heat treatment method and heat treatment device for single crystal sapphire

An imaging system on an aerial vehicle, includes: a group of rotating camera including at least a first and a second rotating cameras on the aerial vehicle; and a control part which controls a first virtual rotation track of the first rotating camera and a second virtual rotation track of the second rotating camera and allows shots to be taken at multiple photograph-shooting points on the first virtual rotation track and the second virtual rotation track; wherein the control part controls a set of multiple photograph-shooting points on the first virtual rotation track and those on the second virtual rotation track to be substantially in a grid shape. Accordingly, a 3D image could be acquired by using the group of rotating cameras on the aerial vehicle during a relatively short endurance flight and more information on images created in such a method could be estimated.

Imaging system mounted in flight vehicle

A method for estimating a position of a target by using an image acquired from a camera is provided. The method includes the steps of: (a) setting multiple virtual estimated reference points by dividing a view-path; (b) comparing altitude values of the respective estimated reference points with those of respective points on terrain; (c) searching neighboring virtual estimated reference points among the multiple virtual estimated reference points to satisfy a requirement under which a difference between an altitude zof one point among the neighboring estimated reference points and that of the terrain corresponding thereto and a difference between an altitude zof the other point among the neighboring estimated reference points and that of the terrain corresponding thereto have different signs; and (d) determining that the actual position of the target exists between the searched estimated reference points P.

Method for estimating position of target by using images acquired from camera and device and computer-readable recording medium using the same

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Seoul, South Korea

Hee Choon Lee