Pusan National University

Jongdeok Kim

Donghyun Kim

JunHwan Huh

Jaemin Lee

Changhong Lee

Jaeyoung Jang

Jaeho Shin

Provided are an apparatus and method for AP placement of large-scale wireless LAN and adaptive wireless resource management enabling to analyze and utilize actual use patterns that were not reflected in initial installation to express characteristics of a building, and to establish strategies for selecting an optimal AP location and wireless resource management based thereon.

Apparatus and method for AP placement of large-scale wireless LAN and adaptive wireless resource management

Disclosed is a device for resolving high-speed competition and distributing multi-channels in consideration of large-scale access based on LoRaWAN that enables efficient and stable communication through limited channel resources in a large-scale wireless transmission environment through a wireless communication wide area network. The device includes a terminal node competition unit for receiving a synchronization beacon and transmitting an access request signal to a base station, and performing an aptive contention window algorithm and enabling a terminal node to enter a transmitter according to a feedback packet (FBP) competition result when the FBP is received from the base station; and a terminal node transmitter for selecting a channel according to queuing rules and checking data transmission queue (DTQ) order, transmitting data when the DTQ order is a transmission turn, standing by FBP reception, and determining whether a contention resolution interval is ended to perform a DTQ reassignment process.

Device and method for resolving high-speed competition and distributing multi-channels in consideration of large-scale access based on LoRaWAN

Disclosed is a deep learning-based object recognition system which includes a data collection process executor configured to perform a data collection process of collecting values of the PIR sensor according to a sampling period; a data classification process executor configured to perform a data classification process of inputting the collected values of the PIR sensor to a model of an artificial neural network and transmitting a result of the inputting the collected values to a cloud using a RESTful API; and an object recognition cloud system configured to store information received from the data classification process executor in a database, transmit the information when a web application requests the information, and represent information collected and classified by devices using the RESTful API.

Deep learning-based object recognition system and method using PIR sensor

An apparatus for acquisition of fast multi-channel data based on a long range wide area network (LoRaWAN) includes: a contention period data processor configured to insert a flag indicating the apparatus itself into an initial contention resolution queue (CRQ), determine whether a flag is a flag of the apparatus, and transmit an access request sequence (ARS) during a contention period; a feedback period data processor configured to check whether information taken out from a data transmission queue (DTQ) is a flag of the apparats, check whether a contention of the apparatus is resolved, and check whether there is a slot for which contention is not resolved among other slots during a feedback period.

Apparatus and method for acquisition of fast multi-channel data based on LoRaWAN

A system for interactive management of remote devices based on LoRa communication includes: a web application configured to provide a remote control page to a user; a cloud system server configured to transmit a management command and a transmission option to a gateway and to receive a summary packet for received data; the gateway configured to receive, from the cloud system server, input request data, transmit the request data to a terminal node, decode response data, and transmit the decoded response data to the cloud system server; and the terminal node configured to receive the management command and the transmission option and transmit the management command and the transmission option to a managed device and store corresponding response data from the managed device through local buffer control.

Growing community of inventors

Busan, South Korea

Jongdeok Kim