Electronics and Telecommunications Research Institute

Yonsei University

Wun-Cheol Jeong

Cheol Sig Pyo

Tae Joon Park

Chang Sub Shin

Hoyong Kang

Seong-Soon Joo

In Hwan Lee

Jong-Moon Chung

Jong-Suk Chae

Ki-yong Jin

Yong Sun Kim

Joon-Hyung Kim

Il Woo Lee

Anseok Lee

Nae Soo Kim

Geon Min Yeo

Se Han Kim

Seong Hee Park

Jun Hee Lee

Young-Il Kim

Juderk Park

Tae-Wook Heo

Chang-Sub Shin

Eun-Hee Kim

Soonyong Song

Hyung-Weon Cho

Dong-Hyuk Han

Won-ju Choi

Min-seok Kim

Kyohoon Son

In Hawn Lee

Nguyen Trung Kien

Keun Hyung Lee

In order to detect an unmanned aerial vehicle (UAV) in a monitoring area using a rotatable camera, an integrated sensor configures a first detection area in the monitoring area by rotating the camera after fixing the focal length of the camera to an initial value, and configures a second detection area in the monitoring area by rotating the camera after changing at least one of the focal length of the camera and a rotation path representing a distance from the origin of the monitoring area.

Method and apparatus for configuring detection area based on rotatable camera

A method for dynamically managing wireless channels to minimize channel interference between heterogeneous wireless devices, and transmitting data by effectively using channels, is provided. Interference between heterogeneous wireless networks is avoided in a channel hopping mode, whereby a data transmission success rate of the wireless sensor network is enhanced, thus enhancing reliability of data transmission.

Method for channel management and data transmission in wireless sensor network

A method and apparatus for encoding a constant amplitude that is applied to a code division multiplexing communication system are provided. By dividing a data bit into a block unit, the receiving side can easily determine an error, and by reducing power consumption in outdoor wide area communication using a bit string of a small length in a basic unit of an input frame, efficiency can be improved, and thus a physical layer of a ubiquitous sensor network can be optimized.

Apparatus and method for encoding constant amplitude in code division multiplexing communication system

A wireless communication method using a control channel between wireless communication devices including: exchanging profile information between a node and intermediate relay nodes therearound so as to allow the node to transmit/receive data to/from a destination node; determining, by the node, a first intermediate relay node using the profile information and determining a wireless communication mode with the first intermediate relay node; and transmitting/receiving data between the node and the first intermediate relay node by the determined wireless communication mode is provided.

Wireless communication device using common control channel and wireless communication method using the same

A multi-channel wireless network acquires reference time information that is commonly applied to all multi-channels and acquires packet receiving time information of a received packet on each channel basis based on the reference time information by spreading and applying the reference time information to each channel.

Method and apparatus for processing packet in multi-channel wireless network

An apparatus for managing a channel resource by a node sets a channel hopping sequence and a channel hopping offset value which are to be used, divides an assigned time slot into a plurality of subslots, divides a data frame for transmission into a plurality of subframes, and selects a channel for transmitting the plurality of subframes in the plurality of subslots, respectively, by channel hopping based on the channel hopping sequence, the channel hopping offset value, the index of the time slot, and the index of a subslot for transmitting a subframe.

Apparatus and method for managing channel resource

A received signal strength indicator is provided. The received signal strength indicator includes a plurality of differential amplifiers forming an amplifier chain for amplifying differential signals and a plurality of rectifiers for rectifying signals output from the plurality of differential amplifiers and the differential signals, and a low pass filter for combining the signals rectified by the plurality of rectifiers to output received signal strength. Each rectifier includes a class AB voltage-current converter for converting a differential voltage into a current, and two triode transistors.

Rectifier, received signal strength indicator, and receiver

A method of operating a device capable of periodically hopping a predetermined interval using a channel hopping sequence in order to improve low radio frequency (RF) reliability caused by single frequency based channel access.

Operating method for a WPAN device

A hybrid virtual multiple-input multiple-output (V-MIMO) transmission method of a management node in a wireless ad-hoc network in which a transmission path from a source node to a destination node is divided into one or more sections is provided. The hybrid V-MIMO transmission method includes obtaining one or more pieces of node information of one or more nodes by transmitting an information request message to the nodes in response to a transmission request message for data transmission from the source node to the destination node; setting a shortest path (SP) from the source node to the destination node based on the obtained node information; determining transmission schemes individually for nodes present on the SP; issuing a transmission preparation request by transmitting the determined transmission schemes to the respective corresponding nodes; and transmitting a transmission start message to the source node in response to transmission ready responses from the respective nodes.

Method and apparatus for hybrid virtual MIMO transmission in wireless ad-hoc network

A decentralized scheduling method in a wireless ad hoc network is provided which includes grouping nodes in the network cluster by cluster, determining a cluster head of each cluster, and sequentially performing scheduling cluster by cluster. Accordingly, it is possible to provide an efficient cluster-based scheduling method which quickly adapts to changes and reduces power consumption.

Scheduling method and scheduling information synchronizing method in wireless ad hoc network

Provided is a method of performing a routing and allocating a resource in a wireless sensor network. The method includes electing one or more cluster heads, each representing each of one or more clusters comprised of a plurality of sensor nodes, selecting a routing path between the cluster heads and the plurality of sensor nodes, selecting a frame length based on elements and distribution methods of the wireless sensor network and the routing path, forming a time slot resource allocation table for communication between the cluster heads, and exchanging the time slot resource allocation table between the cluster heads separated by one hop. The present invention can enhance the reliability of the wireless sensor network and QoS by effectively performing routing and allocating resources in such a manner that various data requirements can be satisfied.

Method of performing routing and allocating resources in wireless sensor network

Growing community of inventors

Daejeon, South Korea

Wun-Cheol Jeong