Abstract: Disclosed herein is an intrusion detection apparatus which includes an infrared emission unit for emitting infrared beams and an infrared reception unit for receiving the infrared beams. The infrared emission unit adjusts an emission direction in which the infrared beams are emitted based on information received from the infrared reception unit, and adjusts an optical axis which is formed with the infrared reception unit depending on whether infrared beam values corresponding to the adjusted emission direction fall within the normal range. The infrared reception unit adjusts a detection direction in which the infrared beams are detected based on information received from the infrared emission unit, and adjusts an optical axis which is formed with the infrared emission unit depending on whether infrared beam values corresponding to the adjusted detection direction fall within the normal range. The intrusion into a relevant region is detected using the optical axis.

Abstract: Provided are a communication method and system for sensor network. In reporting event occurrence in a real-time sensor network application, a cycle time is divided into an event announcement period and a data transmission period to provide real-time transmission performance and energy efficiency. Each of the periods is again divided into the number of slots equal to the maximum depth of a network. Respective nodes sequentially operate according to their depths in a routing tree during the event announcement period to receive the signal transmitted from the lower node. To remove sleep delay, a slot next to the signal reception slot becomes a signal transmission slot. A node sensed an event transmits a signal informing event occurrence during its signal transmission slot, and this signal includes only the address of the transmission node. When a signal does not exist in the event announcement period, no traffic occurs in the data transmission period and the upper nodes maintain a sleep state.

Abstract: Provided are an energy-efficient communication method in a group information-based sensor network and a sensor network system using the method. A group exchanges group information and data with another group in order to provide an application service through inter-group cooperation in a sensor network. In this process, a target group is discovered, a communication path is established, and inter-group communication cycle information for energy-efficient communication is transmitted. On the basis of the group information and the communication cycle information, it is possible to minimize the network resource consumption and provide an energy-efficient inter-group communication method.

Abstract: There is provided a projection lens unit for a pico-projector which comprises a lens array, a color composition prism, a cover glass and an image panel, the projection lens unit characterized in that: the lens array includes 1st to 6th lenses sequentially arrayed from a screen on which an image is projected, the 1st lens includes a stop side formed on a 1st side of the 1st lens, the stop side stops the passage of light, to perform the function of a diaphragm aperture, light passing from the 1st lens to the 6th lens travels in only one direction of the lens sides based on the diaphragm aperture, and parts of the lens sides through which the light does not pass are cut so that the whole height of the lens array is reduced.

Abstract: A projection lens unit for a pica-projector includes a plurality of plastic lenses and a single glass lens to minimize a change in focal length due to the heat generated inside the pico-projector. The lens array includes: a 1st lens with negative (?) refractive power, a 2nd lens with positive (+) refractive power, a 3rd fens with negative (?) refractive power, a 4th lens with negative (?) refractive power, and a 5th lens with positive (+) refractive power, wherein the 1st to 5th lenses are arranged in order from a screen upon which an image is projected, the 1st to 4th lenses are plastic lenses and the 5th lens is a glass lens.

Abstract: Disclosed herein are an apparatus and method for acquiring 3D depth information. The apparatus includes a pattern projection unit, an image acquisition unit, and an operation unit. The pattern projection unit projects light, radiated by an infrared light source, into a space in a form of a pattern. The image acquisition unit acquires an image corresponding to the pattern using at least one camera. The operation unit extracts a pattern from the image, analyzes results of the extraction, and calculates information about a 3D distance between objects existing in the space.

Abstract: Provided are an apparatus and method for asset tracking based on a ubiquitous sensor network (USN) using a motion sensing. The apparatus may include: a motion sensing manager to receive motion sensing information from a sensor; a filtering processor to filter the motion sensing information based on a filtering parameter and to determine whether a motion occurs based on the filtered motion sensing information; and a location information update (LU) manager to perform LU depending on whether the motion occurs.

Abstract: There is provided a projection lens unit for a pico-projector which comprises a lens array, a color composition prism, a cover glass and an image panel, the projection lens unit characterized in that: the lens array includes 1st to 6th lenses sequentially arrayed from a screen on which an image is projected, the 1st lens includes a stop side formed on a 1st side of the 1st lens, the stop side stops the passage of light, to perform the function of a diaphragm aperture, light passing from the 1st lens to the 6th lens travels in only one direction of the lens sides based on the diaphragm aperture, and parts of the lens sides through which the light does not pass are cut so that the whole height of the lens array is reduced.

Abstract: Provided are an energy-efficient communication method in a group information-based sensor network and a sensor network system using the method. A group exchanges group information and data with another group in order to provide an application service through inter-group cooperation in a sensor network. In this process, a target group is discovered, a communication path is established, and inter-group communication cycle information for energy-efficient communication is transmitted. On the basis of the group information and the communication cycle information, it is possible to minimize the network resource consumption and provide an energy-efficient inter-group communication method.

Abstract: Disclosed are an apparatus and a method for smart energy management by controlling power consumption. Power consumption information is collected from one or more electrical device groups with a smart meter and electrical devices connected through gateways. When the method estimates that the power consumption will be larger than a threshold value, a control command is outputted to a load controller connected through the gateway and power consumption of electrical devices that belong to the electrical device using group is remotely controlled. According to an embodiment of the present invention, an energy company that produces and supplies energy can supply energy depending on a consumer's demand by using current facilities because the present invention can collect remotely energy consumption, analyze energy consumption patterns, and control automatically the energy consumption of electrical devices installed in a customer's area.

Abstract: Provided is a programming method of network nodes in sensor network. The programming method receives a code to be programmed in the network nodes. The programming method determines the kind of the received code. The programming method selects a programming scheme according to the determined kind of the code. The programming method programs the received code in the network nodes based on the selected programming scheme.

Abstract: Provided are a communication method and system for sensor network. In reporting event occurrence in a real-time sensor network application, a cycle time is divided into an event announcement period and a data transmission period to provide real-time transmission performance and energy efficiency. Each of the periods is again divided into the number of slots equal to the maximum depth of a network. Respective nodes sequentially operate according to their depths in a routing tree during the event announcement period to receive the signal transmitted from the lower node. To remove sleep delay, a slot next to the signal reception slot becomes a signal transmission slot. A node sensed an event transmits a signal informing event occurrence during its signal transmission slot, and this signal includes only the address of the transmission node. When a signal does not exist in the event announcement period, no traffic occurs in the data transmission period and the upper nodes maintain a sleep state.

Abstract: Provided are an apparatus and method for asset tracking based on a ubiquitous sensor network (USN) using a motion sensing. The apparatus may include: a motion sensing manager to receive motion sensing information from a sensor; a filtering processor to filter the motion sensing information based on a filtering parameter and to determine whether a motion occurs based on the filtered motion sensing information; and a location information update (LU) manager to perform LU depending on whether the motion occurs.

Abstract: A method and apparatus for provisioning a node with executable code is provided herein. Prior to sending out a code request, a node (101) determines a set of nodes that may potentially host the requested code and sends the request to these nodes instead of a blind broadcast. The determination of what nodes have access to the required code is based on a history information of code request of the node, the overhead traffic, and/or application dependencies that are available to the node. The code request is unicast-based and may involve a multi-hop path for both code requests and responses. If this step fails, a broadcast-based approach can be again employed to request the code.

Abstract: Provided is method of forming a cluster individually by each sensor node over a sensor network, in which each sensor node has cluster information and authority to assign cluster membership and recognizes a sensor node that is not a cluster member in a radius of the cluster in order to include the recognized sensor node in the cluster as a cluster member. The sensor node that becomes a member of the cluster wirelessly receives an application of the cluster in order to be upgraded. Thus, after initial sensor node setting, a cluster can be formed automatically and a program suitable for each cluster can be upgraded without human intervention.