Abstract:
Disclosed herein are an astral lamp device having detachable and angle-controllable LED module blocks and a method of setting the same. The astral lamp device having detachable and angle-controllable LED module blocks, includes a plurality of LED module blocks having one end attached to and disposed on a central frame; and an angle control part configured to control an angle of the LED module block attached to the central frame.
Abstract:
Disclosed are a bidirectional optical transceiver module and a method of aligning the same. The bidirectional optical transceiver module includes: a package having on one side a cavity; a platform mounted on the package; a transmitter which generates output light; a holder which includes the horizontal portion having the through-hole and disposed on the package to cover the cavity, and the vertical portion which has the inclined surface on one side and the connection hole connected to the through-hole; a receiver which generates an electric signal that corresponds to input light incident into the cavity; and a WDM filter that delivers the output light and the input light.
Abstract:
Provided is an apparatus that measures a thickness of a coating by selecting a wavelength of a laser based on a color of the coating using a contactless method using a photoacoustic effect and an interferometer, the apparatus including a pulsed laser source to irradiate a pulsed laser beam toward the coating, a continuous wave (CW) laser source to irradiate a CW laser beam toward the coating, a detector to detect an optical interference signal corresponding to the CW laser beam, and a signal processor to process the optical interference signal to calculate a thickness of the coating.
Abstract:
Disclosed are a key managing system and method for sensor network security. The key managing system includes a secret key transmitter configured to transmit a portion of a secret key map, stored in a node, to a correspondent node, and transmit the secret key map of the node to the correspondent node by using the transmitted portion of the secret key map and an authenticator configured to acquire a trust level of the correspondent node which indicates a ratio of a total size of the secret key map of the node and a size of the secret key map transmitted to the correspondent node, compare the acquired trust level of the correspondent node and a threshold value, and authenticate the correspondent node and a message acquired from the correspondent node by using the comparison result.
Abstract:
A control device is provided which controls wireless communication linkage between communication devices. The control device includes a communication unit configured to perform wireless communication with first and second communication devices; a user interface unit configured to generate a communication unit active signal according to a control of a user; and a control unit configured to activate the communication unit in response to the communication unit active signal. The communication unit receives communication linkage information for communication linkage between the first and second communication devices from the first communication device and sends the communication linkage information to the second communication device.