Abstract: The present invention relates to a mixed metal oxide catalyst in which a hydrotalcite precursor containing an alkali metal is impregnated or intercalated with a nonprecious metal, a method of manufacturing the same, and a method of decomposing nitrogen oxide using the mixed metal oxide catalyst. The mixed metal oxide catalyst has excellent catalytic activity because it can decompose NOx, N2O or a mixture thereof even at low temperature, and is economical because it does not use a precious metal.

Abstract: The present invention relates to a method of adsorbing and reducing nitrogen oxides using a mixed metal oxide catalyst, and more particularly, to a method of improving the efficiency of adsorption and desorption of nitrogen oxides using a mixed metal oxide catalyst prepared from a hydrotalcite precursor. According to the invention, NOx and N2O, which coexist with oxygen (O2) known to be very difficult to reduce and decompose, are efficiently decomposed by adsorbing and separating NOx and N2O from oxygen and then decomposing the adsorbed NOx and N2O using a reducing agent.

Abstract: The present invention relates to a mixed metal oxide catalyst in which a hydrotalcite precursor containing an alkali metal is impregnated or intercalated with a nonprecious metal, a method of manufacturing the same, and a method of decomposing nitrogen oxide using the mixed metal oxide catalyst. The mixed metal oxide catalyst has excellent catalytic activity because it can decompose NOx, N2O or a mixture thereof even at low temperature, and is economical because it does not use a precious metal.

Abstract: The present invention relates to a method of adsorbing and reducing nitrogen oxides using a mixed metal oxide catalyst, and more particularly, to a method of improving the efficiency of adsorption and desorption of nitrogen oxides using a mixed metal oxide catalyst prepared from a hydrotalcite precursor. According to the invention, NOx and N2O, which coexist with oxygen (O2) known to be very difficult to reduce and decompose, are efficiently decomposed by adsorbing and separating NOx and N2O from oxygen and then decomposing the adsorbed NOx and N2O using a reducing agent.

Abstract: Configuring a direction-based Core Based Tree (CBT) for an overly multicast includes: requesting and receiving from an arbitrary terminal node information on a child node pre-subscribed to a core node; calculating a direction between the arbitrary terminal node and each of the received child nodes, to transmit information to the core node on the child node having a minimum resultant value along with a subscription request message; receiving the subscription request message and the child node information, and comparing a resultant direction calculation value of the corresponding child node and terminal node with a resultant direction calculation value between the pre-subscribed child nodes and allowing the terminal node to subscribe to a child node or a parent node to configure the CBT; and, periodically transmitting and receiving a hello packet between the core node and the terminal node, and among the parent-, child and brother nodes.

Abstract: A method of configuring a direction-based Core Based Tree (CBT) for a CBT-based overly multicast includes: requesting and receiving an arbitrary terminal node which intends to subscribe to the CBT of information on a child node pre-subscribed to a core node; calculating a direction between the arbitrary terminal node receiving the child node information from the core node and each of the received child nodes, to transmit information to the core node on the child node of the core node having a minimum resultant value along with a subscription request message; receiving the subscription request message transmitted from the terminal node and the child node information from the core node, and comparing a resultant direction calculation value of the corresponding child node and terminal node with a resultant direction calculation value between the pre-subscribed child nodes and allowing the terminal node to subscribe to a child node or a parent node of the corresponding child node to configure the CBT in response

Abstract: An optical transmission system controls an ALS (Automatic Laser Shutdown) function using a message. The optical transmission system includes first and second optical repeaters. The first optical repeater monitors a plurality of optical lines incoming from the second optical repeater to detect a line loss. Upon detection of the line loss, the first optical repeater designates an optical line in an opposite direction of a defective optical line having the line loss, and transmits a request message for performing the ALS function to the second optical repeater through the designated optical line. The request message includes information about the defective optical line. Upon reception of the request message, the second optical repeater analyzes the received request message and performs the ALS function for the defective optical line, and transmits a response message after performing the ALS function to the first optical repeater through an optical line paired with the defective optical line.