Electronics and Telecommunications Research Institute

Korea Aerospace Research Institute

Sang Rok Lee

Seong Bin Lim

Moon Jin Jeon

Hui Kyung Kim

Eung Hyun Kim

Seok Weon Choi

Jung Sun Kim

Jong Hyun Lee

Joon Hak Bang

Cheol Ho Lee

Jung Min Kang

In Sook Jang

Sung Un Lee

Wan Seok Seo

Byeong Ho Yoon

Provided is an apparatus for controlling an orbiting satellite by sensing a change in a yaw angle of the orbiting satellite and calculating a ground sample distance (GSD) based on the yaw angle. The apparatus may include a sensor configured to sense a yaw angle corresponding to yaw steering of the orbiting satellite, and a processor configured to calculate, based on the yaw angle, a GSD corresponding to a length of a pixel projected onto a planetary surface scanned by the orbiting satellite.

Apparatus and method for controlling a satellite

An apparatus and method for blocking the activity of malware are disclosed. The apparatus for blocking the activity of malware includes a storage unit, a posting unit, and a control unit. The storage unit stores an automatic execution permission list and a set security level. The posting unit posts a predetermined control time immediately after user terminal booting and a predetermined control time immediately after user login. The control unit permits or blocks the execution of an execution attempt file for the predetermined control time immediately after the booting and the predetermined control time immediately after the user login based on the automatic execution permission list and the set security level.

Apparatus and method for blocking activity of malware

An optical gate based optical space division switch for switching optical signals inputted through arbitrary input ports to a desired output port with no internal collision. The optical space division switch comprises a first splitting section for splitting the optical signals inputted through the input ports, a first amplification section for selectively amplifying output optical signals from the first splitting section, a second splitting section for splitting output optical signals from the first amplification section, a second amplification section for selectively amplifying output optical signals from the second splitting section, a coupling section for coupling output optical signals from the second amplification section, and a third amplification section for amplifying an output optical signal from the coupling section and transferring the amplified optical signal to the output port. According to the present invention, optical gates are connected in a two-stage manner to cross-couple optical signals. Therefore, the optical signals are transferred only to a desired output port, thereby reducing the number of their crosstalk components and so significantly improving a signal-to-noise ratio.

Optical gate based optical space division switch

Growing community of inventors

Daejeon, South Korea

Sang Rok Lee