Electronics and Telecommunications Research Institute

Ajou University Industry-academic Cooperation Foundation

Ajou University Industry Cooperation Foundation

Apex Co. Ltd.

Fumate Co., Ltd

Lg Chem, Ltd

Lg Energy Solution, Ltd.

Sang Joon Park

Ki Hwan Kim

Cheol Sig Pyo

Jong Seok Kim

Yong Chan Kim

Chang Eun Lee

Young Bae Ko

Myung In Ji

Young Su Cho

Yang Koo Lee

Sung Hee Lee

Ju Derk Park

Kang Woo Lee

Eun Young Cho

Young Hwan Ham

Sung Woo Jun

Blagovest Iordanov Vladimirov

Jin Hee Son

So Yeon Lee

Young Bag Moon

Wan Gyun Choi

Jong-Hyun Park

Jong Suk Chae

Do Hyun Kim

Gi Mun Um

Jong Hyun Park

Dong Kyoo Kim

Eun Jeong Lee

Sang Ho Kim

Jooyoung Kim

Youngsu Cho

Kwang Yong Kim

Eun Byurl Cho

Myungin Ji

Seung Mok Yoo

Yoo Seung Song

Sung Su Kim

Sung Jo Yun

Joo Young Kim

Woo Sung Jung

Jae In Lee

Dai Ki Lee

Seung Cheol Goh

Sang Jin Lee

Kwang Jo Kim

Keun Woo Lim

Kwan Goo Rha

Jeong Man Woo

Jae Ho Kim

In Chel Shin

Uzair Ahmad

An active data collection mode control system to reduce crowd sourcing signal data collection required for fingerprint database (FPDB) maintenance is provided. The system includes a mobile device that supports a survey mode, a localization mode, and a crowd-sourcing mode, and a server that receives data from the mobile device, generates and updates an FPDB, and controls a data collection mode.

System and method for active data collection mode control for reducing crowd-sourcing signal data collection required for fingerprint database maintenance

Provided is an atypical environment-based location recognition apparatus. The apparatus includes a sensing information acquisition unit configured to, from sensing data collected by sensor modules, detect object location information and semantic label information of a video image and detect an event in the video image; a walk navigation information provision unit configured to acquire user movement information; a metric map generation module configured to generate a video odometric map using sensing data collected through a sensing information acquisition unit and reflect the semantic label information; and a topology map generation module configured to generate a topology node using sensing data acquired through the sensing information acquisition unit and update the topology node through the collected user movement information.

Location recognition method and apparatus in atypical environment

The present invention relates to a method and apparatus for performing object segmentation in an image. More particularly, the present invention divides a screen of an input image into at least two sub-images, and generates one image by combining the at least two sub-images to which an image segmentation algorithm is respectively applied.

Method and apparatus for performing segmentation of small objects within moving pictures in real-time

Provided are a method for determining a moving direction of a terminal and correcting a position thereof, and a positioning apparatus using the same. Relative direction information is estimated based on N pieces of position information of the terminal, and distortion information is removed from the relative direction information to acquire relative direction information without direction integrity. Further, the relative direction information is transmitted into absolute direction information to acquire a moving path direction of the terminal. Next, the position information of the terminal is corrected based on the moving path direction of the terminal.

Method for determining moving direction of terminal and correcting position thereof, and positioning apparatus using the method

A system for filtering a terminal location by combining WiFi location information and sensor information, the system includes a filter that filters an inaccurate location of a terminal by combining location information calculated from WiFi signals and sensor information, and by using indicators to remove abnormal location information.

System and method for filtering mobile terminal location by combining Wi-Fi location information with sensor information

A method and apparatus for compensating an estimated location of a wireless network element from information collected by heterogeneous terminals are provided. The method may include receiving information on a received signal strength indication (RSSI) of a wireless network element and location information of a heterogeneous terminal from the heterogeneous terminal by a wireless network element positioning server, compensating the information on the RSSI received from the heterogeneous terminal into information on an RSSI received from a predetermined reference terminal, using a difference value model of the RSSI of the wireless network element between heterogeneous terminals, the difference model generated in advance, and estimating a location of the wireless network element using the compensated information on the RSSI from the reference terminal and the received location information.

Method and apparatus for compensating estimated location of wireless network elements estimated from information collected by heterogeneous terminals

A method and apparatus for estimating a position of an access point (AP) includes (a) measuring a strength of a signal, transmitted by the AP, at three or more measurement points (MPs), (b) selecting an imaginary attenuation factor, (c) calculating a range between the AP and each of the MPs on the basis of the imaginary attenuation factor and a strength of a signal measured at the MP, (d) calculating an intersecting point of ranging circles in each of which a position of the MP is a center and the range between the MP and the AP is a radius, (e) calculating a best intersecting point from among a plurality of the intersecting points obtained by repeating the steps (c) and (d) while changing the imaginary attenuation factor, and (f) estimating the best intersecting point as the position of the AP.

Method and apparatus for estimating position of access point in Wi-Fi system

Provided is a multi-route routing scheme that supports Quality of Service (QoS) in the wireless mesh network. A method of notifying about and avoiding congestion situation in data transmission in a wireless mesh network and a mesh node may also be provided. Data may be differentially transmitted to multiple routes by obtaining a route congestion level existing in a current multi-hop route and thus, data providing a real-time service, such as a video streaming service, may avoid congested routes and may be promptly transmitted. Multiple queues in a mesh node may be divided into divided queues based on a congestion situation of a transmission route in a network and the divided queues may be transmitted through multiple routes and thus, an efficiency of the overall network may increase.

Method for notifying about/avoiding congestion situation of data transmission in wireless mesh network, and mesh node for the same

Provided are an ad-hoc wireless communication method using a sector antenna, a recovery method in ad-hoc wireless communication, and an ad-hoc wireless communication system. The ad-hoc wireless communication method using a sector antenna according to an exemplary embodiment of the present invention, includes: transmitting a requesting message for setting a communication link while changing transmission power to each sector of the sector antenna; receiving a response message corresponding to the requesting message from a receiving node of each sector; configuring a routing table for the transmission power for each sector based on the received response message; and transmitting data at the transmission power for each sector by referring to the routing table.

Ad-hoc wireless communication method using sector antenna, recovery method in ad-hoc wireless communication and ad-hoc wireless communication system

Disclosed are an apparatus and method for controlling a radiation direction of a small sector antenna, used for a small wireless transmission device having limited power and calculation capabilities, capable of operating at a low power consumption with the necessity of simple calculation capabilities or without the necessity of even a few calculation capabilities. The apparatus for controlling a radiation direction of a small sector antenna includes a plurality of capacitance blocks including a plurality of capacitors each having one end commonly connected to corresponding parasitic elements and having a different capacitance. Capacitors having a capacitance corresponding to a radiation direction are selectively connected to corresponding parasitic elements through a plurality of switching units and a controller, thereby simplifying controlling and reducing power consumption for controlling the radiation direction.

Method and apparatus for controlling radiation direction of small sector antenna

Provided are a simulation apparatus and method used to simulate a sensor network. A sensor node of a real node is reflected in a simulation, and bidirectional communication is performed between a real node and a virtual node, in order to reflect a real environment and a simulation environment in each other and make the real node and the virtual node consistent with each other, thereby performing simulation.

Simulation apparatus and method used for sensor network

Provided are a sensor network structure, a data aggregation method, and a clustering method for efficient multi-target tracking. The multi-target tracking may be efficiently performed in a heterogeneous sensor network by combining clustering methods and adaptively varying the clustering methods. As such, an energy consumption problem in a sensor network may be reduced, and a data transmission delay problem or a data traffic problem may be solved by reducing the amount of data to be transmitted.

Hybrid clustering based data aggregation method for multi-target tracking in wireless sensor network

A network having a hierarchical structure includes a plurality of clusters. Each of the clusters includes a plurality of nodes and a cluster head connected to the nodes in a mesh format. Each of the nodes is connected to other clusters via the cluster head.

Wireless sensor network having hierarchical structure and routing method thereof

A method for effectively using power resource in a wireless mesh network is disclosed to select and change a level of a power saving mode according to terminal and network situations to increase the duration of the network's existence as well as improve the power consumption of each mesh terminal. After active mesh terminals that are to perform a data relay function and super-saving mesh terminals that are not to perform the data relay function are selected in consideration of a network topology at certain periods, the level of a power saving mode of the mesh terminals selected as the super-saving mesh terminals is higher than that of the mesh terminals selected as the active mesh terminals. And then, a routing path in a tree form is formed along the mesh terminals selected as the active mesh terminals to transmit data.

Method for improving energy efficiency in wireless mesh network

There is disclosed a showerhead apparatus for radical-assisted deposition including a showerhead of a two-stair structure separated by a given distance, which has a first buffer for uniformly distributing a raw material gas and a second buffer for uniformly distributing a plasma gas, wherein a plasma is generated within the showerheads and the raw material gas sprayed into the plasma is constantly maintained, thus forming a uniform thin film on a wafer or a substrate. The showerhead apparatus for radical-assisted deposition comprises a raw material gas spray mechanism including a first buffer which is divided into upper and lower layers for uniformly distributing a gas introduced from a raw material gas injection tube, wherein a plurality of raw material gas spray holes for spraying the raw material gas distributed within the first buffer at a given flow rate is formed at a lower plate of the spray mechanism; a plasma generating gas spray mechanism including a second buffer for uniformly distributing a plasma generating gas between with the raw material gas spray mechanism, wherein a plurality of plasma generating gas spray holes and through holes for spraying the plasma generating gas distributed within the second buffer are formed at a lower plate of the spray mechanism, respectively; a guide mechanism for communicating the raw material gas spray holes in the raw material gas spray mechanism and the through holes in the plasma generating gas spray mechanism and for inducing the raw material gas and the plasma generating gas so that they are not mixed; and a RF generating mechanism mounted at one outside side of the raw material gas spray mechanism, wherein a RF rod for applying an outside RF power is included at a lower plate of the RF generating mechanism.

Showerhead apparatus for radical-assisted deposition

Growing community of inventors

Daejeon, South Korea

Sang Joon Park