Abstract: A secret key generation apparatus and method are provided. The secret key generation apparatus includes at least one antenna, amplification/phase controllers, a transceiver, and a random signal controller. The antenna receives a wireless signal from a counterpart terminal that performs wireless communication. The amplification/phase controllers control the amplification gain and phase of the wireless signal that is received via at least one antenna. The transceiver measures the status of a wireless channel using the wireless signal having the controlled amplification gain and phase, determines parameters based on results of the measurement, and generates a secret key based on results of the determination. The random signal controller controls the amplification/phase controllers so that the amplification gain and phase are adjusted whenever the transceiver generates a secret key.

Abstract: Disclosed is a social network service device. The social network service device includes a message processing unit which receives, from a common smart device, an identifier of a user group which uses the common smart device, and information of a personal smart device which is connected to the common smart device for a multi-screen service, and a social network establishment unit which establishes a social network between common smart devices by modeling a relation between the user group and a user who uses the personal smart device, and a relation between the common smart device and the personal smart device, using the information of the personal smart device, based on the identifier of the user group.

Abstract: Disclosed is a space perception device which includes a transceiver unit transmitting and receiving a signal; a processing unit analyzing signals transmitted and received through the transceiver unit to search location information of an obstacle at a space; and a vibration unit providing a user with location information of an obstacle at a space in response to a control of the processing unit. The vibration unit includes a plurality of vibrators having different three-dimensional coordinates.

Abstract: A flight dynamics subsystem (FDS), a velocity increment calculation module, and operational methods of the same are provided. A used fuel quantity actually used in a satellite is calculated, and a velocity increment is calculated using the calculated fuel quantity. Therefore, an orbit of the satellite may be estimated more accurately.

Abstract: Provided are a method of fabricating an electrophoretic ink, the electrophoretic ink formed using the method, and an electrophoretic display having the same. The method of fabricating the electrophoretic ink includes dispersing a pigment particle into a dielectric fluid for the electrophoretic ink and adding at least monomer and initiator to the dielectric fluid to form a polymeric membrane surrounding the pigment particle. Since the pigment particle surrounded by the polymeric membrane and the dielectric fluid in which the pigment particle is dispersed can be utilized as the electrophoretic ink as they are, the method of fabricating the electrophoretic ink is simplified.

Abstract: Disclosed are a transmitting device and receiving device for selecting a transmit channel in a wideband high frequency wireless system using a plurality of transmit antennas, and a method thereof. According to the method of selecting a transmit channel, data is transmitted to the receiving device via a predetermined first antenna, and a first channel probing response message including first channel status information of the first antenna is received, in response to the transmission of the data. A channel probing request message that request channel status information of a second antenna, is transmitted to the receiving device via the second antenna, and a second channel probing response message including the second channel status information of the second antenna is received in response to the channel probing request message.

Abstract: The adaptive frequency control apparatus includes: a frequency downstreamer for converting the frequency of the radio frequency signal to a frequency of a defined band according to a reference signal; a frequency error measurer for measuring a frequency error between a frequency of the output signal of the frequency downstreamer and a defined frequency; a loop filter for filtering the frequency error output from the frequency error measurer based on a plurality of operational parameters, the operational parameters being changeable; a differential amplifier for generating a control signal for a voltage control based on the output signal of the loop filter; and a voltage-controlled oscillator for changing the frequency of the reference signal according to the control signal of the differential amplifier.