Abstract: The present invention relates to a lens system for a head-up display. The technical gist of the present invention is to provide a lens system for a head-up display, comprising: a first group of lenses positioned toward a screen with reference to a diaphragm; and a second group of lenses positioned toward an image element, wherein each lens is combined/arranged such that the DN/DT (abs.) (temperature coefficients of refractive index (10?6/° C. at 632.8 nm)) value of a lens that satisfies |P|>=40 (P is refractive power of each lens), among the plurality of lenses constituting the first and second groups of lenses, has a positive number value or a negative number value according to the refractive power, and the lens system accordingly has thermal compensation characteristics by controlling the amount of change in the focal distance of each lens.

Abstract: Disclosed herein are a method of controlling Hierarchical Mobile IPv6 (HMIPv6) network-based handover and an Access Router (AR) and Mobile Node (MN) therefor. The method include the steps of a first AR, to which a MN is connected, receiving an L3 handover initiation message, including a Media Access Control (MAC) address of the MN and the ID of a target Base Station (BS); the first AR creating a Local Care-of Address (LCoA) based on the MAC address of the MN and the ID of the target BS, and performing Binding Update (BU) on a Mobility Anchor Point (MAP) using the created LCoA; when an L2 handover completion message is received from the target BS of the MN, a second AR creating a second LCoA and transmitting the second LCoA to the MN; and the MN receiving the second LCoA from the second AR and configuring the received second LCoA as its own LCoA.

Abstract: Disclosed herein are a sensor network control method for data path establishment and recovery and a sensor network therefor. The sensor network control method includes the steps of (a) the sink node or a first sensor node creating an interest message, including information about a hop count between itself and the sink node, and transmitting the interest message to one or more neighboring nodes; (b) a second sensor node, which has received the interest message, creating a routing table using the hop count information of the interest message and information about the node having transmitted the interest message, (c) the second sensor node determining a data transmission path for data transmission to the sink node using the routing table; and (d) the second sensor node transmitting an interest message, including information about a hop count between itself and the sink node to at least one neighboring node.

Abstract: Disclosed herein are a method of controlling Hierarchical Mobile IPv6 (HMIPv6) network-based handover and an Access Router (AR) and Mobile Node (MN) therefor. The method include the steps of a first AR, to which a MN is connected, receiving an L3 handover initiation message, including a Media Access Control (MAC) address of the MN and the ID of a target Base Station (BS); the first AR creating a Local Care-of Address (LCoA) based on the MAC address of the MN and the ID of the target BS, and performing Binding Update (BU) on a Mobility Anchor Point (MAP) using the created LCoA; when an L2 handover completion message is received from the target BS of the MN, a second AR creating an LCoA and transmitting the LCoA to the MN; and the MN receiving the LCoA from the second AR and configuring the received LCoA as its own LCoA.

Abstract: The velocity of a fluid flowing through a flow channel, relative to the flow channel, is measured by passing parallel rays of light through the fluid perpendicular to the flow and through an artificially-introduced transfer function device such as a grating or double reflective mirror, and then focusing the light on a photodetector. The basic principle by which embodiments of the invention operate involves the spatial convolution of the light intensity pattern established by the artificially-introduced transfer function with the flowing stream. The transfer function is associated with a known spatial alteration of the light beam. The light intensity pattern resulting from variations in the properties of the flowing stream is characterized by fluctuations which are transported with the flow velocity. These variations of the flowing stream are manifested as localized changes in density, and absorptivity and reflectivity of the light as it traverses the flow channel.