摘要:
A method of preparing 2-deoxy-L-ribose represented by the following formula I is disclosed. The preparation method includes the steps of: treating L-arabinose with an alcohol solvent in the presence of an acid to prepare 1-alkoxy-L-arabinopyranose; allowing the prepared 1-alkoxy-L-arabinopyranose to react with acyl chloride so as to prepare 1-alkoxy-2,3,4-triacyl-L-arabinopyranose; brominating the alkoxy group of the prepared 1-alkoxy-2,3,4-triacyl-L-arabinopyranose to prepare a 1-bromo-2,3,4-triacyl compound; allowing the prepared compound to react with zinc in the presence of ethyl acetate and an organic base so as to prepare glycal; treating the glycal with an alcohol solvent in the presence of an acid to prepare 1-alkoxy-2-deoxy-3,4-diacyl-L-ribopyranose; treating the prepared 1-alkoxy-2-deoxy-3,4-diacyl-L-ribopyranose with a base to prepare 1-alkoxy-2-deoxy-L-ribopyranose; and hydrolyzing the prepared 1-alkoxy-2-deoxy-L-ribopyranose in the presence of an acid catalyst.
摘要:
A method of preparing 2-deoxy-L-ribose represented by the following formula I is disclosed. The preparation method includes the steps of: treating L-arabinose with an alcohol solvent in the presence of an acid to prepare 1-alkoxy-L-arabinopyranose; allowing the prepared 1-alkoxy-L-arabinopyranose to react with acyl chloride so as to prepare 1-alkoxy-2,3,4-triacyl-L-arabinopyranose; brominating the alkoxy group of the prepared 1-alkoxy-2,3,4-triacyl-L-arabinopyranose to prepare a 1-bromo-2,3,4-triacyl compound; allowing the prepared compound to react with zinc in the presence of ethyl acetate and an organic base so as to prepare glycal; treating the glycal with an alcohol solvent in the presence of an acid to prepare 1-alkoxy-2-deoxy-3,4-diacyl-L-ribopyranose; treating the prepared 1-alkoxy-2-deoxy-3,4-diacyl-L-ribopyranose with a base to prepare 1-alkoxy-2-deoxy-L-ribopyranose; and hydrolyzing the prepared 1-alkoxy-2-deoxy-L-ribopyranose in the presence of an acid catalyst.
摘要:
A fluid-pressure regulator for regulating the pressure of a fluid. The regulator includes a variable-resistance fluid element and a variable-volume fluid element located downstream of the variable-resistance element. Pressure in the fluid at the outlet of the regulator is controlled by substantially simultaneously changing the resistance of the variable-resistance element and the volume of the variable-volume element. In one example, a decrease in pressure is effected at the outlet by simultaneously increasing the resistance of the variable-resistance element and increasing the volume of the variable-volume element. Some embodiments of the regulator are particularly useful to effect long-term and high-speed pressure changes in high-resistance fluidic channel networks.
摘要:
A method of transmitting digital broadcasting content for providing 2D content or 3D content. The method includes: encoding content including at least one of the 2D content and the 3D content and generating an elementary stream including encoded data of the content; generating service additional information including electronic program guide (EPG) information of the digital broadcasting content and inserting, into the service additional information, at least one of 2D/3D content identification information representing a method of reproducing the 2D content or the 3D content, 2D/3D content link information representing a relationship between the 2D content and the 3D content, and EPG 3D reproduction information for reproducing an EPG screen, on which EPG information is displayed, in 3D; and generating a transport stream by multiplexing the elementary stream and the service additional information.
摘要:
The nonvolatile memory device includes a semiconductor substrate, and a device isolation layer defining an active region in the semiconductor substrate. The device isolation layer includes a top surface lower than a top surface of the semiconductor substrate, such that a side-upper surface of the active region is exposed. A sense line crosses both the active region and the device isolation layer, and a word line, spaced apart from the sense line, crosses both the active region and the device isolation layer.
摘要:
An electrically erasable and programmable read only memory (EEPROM) device and a method of manufacturing the EEPROM device are provided. First and second gate structures having the same structure are formed on a tunnel insulating layer formed on a substrate, such that the first and second gate structures are spaced apart from each other. A common source region is formed at a portion of the substrate located between the first and second gate structures. First and second drain regions are formed at first and second portions of the substrate adjacent to the first and second gate structures, respectively. Thus, the EEPROM device is manufactured including first and second transistors that have the same structure and may alternately serve as a memory transistor and a selection transistor according to an applied signal.
摘要:
A semiconductor device includes transistors with a vertical gate electrode. In a transistor structure, a semiconductor pattern has first and second sides facing in a transverse direction, and third and fourth sides facing in a longitudinal direction. Gate patterns are disposed adjacent to the first and second sides of the semiconductor pattern. Impurity patterns directly contact the third and fourth sides of the semiconductor pattern. A gate insulating pattern is interposed between the gate patterns and the semiconductor pattern.
摘要:
The present invention discloses a home network system (1) using a living network control protocol. The home network system (1) includes: at least one electric device; (40-49); a network manager (20-23) for controlling and monitoring the electric device (40-49); and a network based on a predetermined protocol, for connecting the electric device (40-49) and the network managers (20-23), wherein the network manager (20-23) stores a HomNet Profile containing information on the electric device (40-49), and updates the HomNet Profile by communicating with the electric device (40-49) through the network, wherein the HomNet Profile comprises at least one of a device information file containing specific intrinsic information on the electric device, a node parameter file containing a node parameter designated for the electric device, a device operation file containing data on an operational state of the electric device and a scenario file for defining supplementary services for the electric device.
摘要:
A fluid-pressure regulator for regulating the pressure of a fluid. The regulator includes a variable-resistance fluid element and a variable-volume fluid element located downstream of the variable-resistance element. Pressure in the fluid at the outlet of the regulator is controlled by substantially simultaneously changing the resistance of the variable-resistance element and the volume of the variable-volume element. In one example, a decrease in pressure is effected at the outlet by simultaneously increasing the resistance of the variable-resistance element and increasing the volume of the variable-volume element. Some embodiments of the regulator are particularly useful to effect long-term and high-speed pressure changes in high-resistance fluidic channel networks.
摘要:
A home network system which can efficiently configure a new home appliance in the home network system. The home network system includes at least one new device newly connected to a master device through a network, for transmitting a plugged-in request message containing an initial address through the network, receiving an address change request message containing a logical address, and changing the initial address to the logical address, and at least one master device connected to the new device through the network, for receiving the plugged-in request message from the new device, setting the logical address for the new device, and transmitting the address change request message containing the logical address to the new device, wherein the initial address comprises at least a product code and a logical address of the new device, and the new device changes the logical address to the logical address set by the master device.