Abstract:
본 발명은 다수 참조 프레임을 사용하는 영상 코덱의 에러 리질리언스를 위한 참조 프레임 선택 기법에 관한 것으로서, 본 발명에 따른 다수 참조 프레임을 사용하는 영상 코덱의 에러 리질리언스를 위한 참조 프레임 선택 기법은, 부호화되기 위한 매크로블록의 참조 매크로블록을 검색하기 위해 다수의 참조 프레임 각각에서 움직임 예측(motion estimation)이 개별적으로 수행되는 단계와, 상기 움직임 예측에 의해 검색된 참조 매크로블록 영역 및 참조 프레임의 인트라 코딩된 매크로블록(Intra-coded MB) 영역 간의 일치 정도가 확인되는 단계와, 상기 다수의 참조 프레임 각각에서 검색된 참조 매크로블록들 중 참조 프레임의 상기 인트라 코딩된 매크로블록(Intra-coded MB)과 상대적으로 가장 일치되는 참조 매크로블록의 움직임 벡터(MV: Motion Vector)가 선택되는 단계를 포함하여 구성된다.
Abstract:
The present invention relates to a fall sensing device worn in a manner of being hooked on a physical body, a method thereof, an integrated fall accident managing system and a fall accident managing method using the same, capable of always obtaining a correct fall determination result in spite of vigorous physical activities of a corresponding user while being worn on the physical body of the user, because it does not express various movements linked with the physical activities; and being implemented via a two step algorithm where a fall determination process is separated into sections before and after an occurrence of the fall, checks whether or not a lying state of the user is caused by the fall and uses a shock amount generated when the fall occurs. The fall sensing device according to the present invention comprises a sensor node worn in a manner of being hooked on an upper body for sensing whether a corresponding physical body falls; and a storage part for storing vector data for determining the fall to be compared with a signal value sensed by the sensor node, wherein the sensor node includes an accelerometer for measuring an acceleration value; a gyroscope for measuring an angular velocity value; and a fall determination part for detecting an angle between the upper body and the ground by using acceleration influenced by the gravity in an angular axis of the accelerometer, calculating the shock amount generated when the physical body lies by using the acceleration and the angular velocity measured by the accelerometer and the gyroscope, respectively, after determining whether the corresponding physical body is in a lying state by using the detected angle, and determining whether the corresponding physical body falls by comparing the calculated shock amount with the vector data of the storage part.
Abstract:
The present invention relates to a wireless sensor network system using a cluster structure and a wireless networking method using the same, wherein the cluster structure supports the mobility of a mobile sensor node by detecting the mobility of a mobile sensor node and allowing the mobile sensor node to access a new cluster based on a beacon signal when a cluster-based mobile sensor node moves. The wireless sensor network system using a cluster structure supporting the mobility of a mobile sensor node according to the present invention comprises at least one cluster head node, multiple cluster member nodes, and a base station. The at least one cluster head node is a mobile sensor node included in a cluster in a wireless sensor network, and a transmission cycle, T_beacon, of a beacon message for another mobile sensor node in the cluster is set in the cluster head node. The multiple cluster member nodes: are mobile sensor nodes transmitting data to a head node to which each cluster member node belongs among the cluster head nodes included in the cluster; have a function of calculating, from the beacon message, the signal strength of the cluster head node, and at the same time, a R_th value which is the signal strength to support data transmission is set; and calculate a distance from the cluster head node using the calculated signal strength of a cluster head node and the R_th value. The base station receives data on the cluster member nodes which are collected and transmitted by the cluster head node.
Abstract:
PURPOSE: A system for safely using a transportation which used an RFID tag is provided to effectively supply location information of a passenger or distinct information of a vehicle to a safety manger, thereby preventing a crime. CONSTITUTION: An RFID(Radio Frequency Identification) tag(100) stores tag information. A passenger rode on a transportation unit(10) has the RFID tag. An RFID reader terminal is installed in the transportation unit. The RFID reader terminal stores the distinct information and location information of the transportation unit. The tag information is contact information. The RFID reader terminal transmits the distinct information and the location information to the corresponding address by reading the tag information.