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딥러닝 기반 스마트시티 영상관제 솔루션의 오산시 실증사례 연구
김영혁 한국통신학회 2020 정보와 통신 Vol.37 No.5
본 고에서는 CCTV 영상을 이용한 딥러닝 기반 보행자/차량속성 검출 및 분류 기술, 딥러닝 기반 보행자 얼굴 및 전신 인식/검색 기술, GIS 기반 통합영상 선별 관제 기술 등을 포함하는 스마트시티(Smart City) 영상관제 솔루션을 살펴보고 해당 솔루션으로 오산시에 적용한 실증사례 결과를 알아본다.
무인자동차 시스템 개발을 위한 IEEE 802.11a 기술분석 및 연구
김영혁,최상욱,김정숙,이재광,Kim, Young-Hyuk,Choi, Sang-Wook,Kim, Jung-Sook,Lee, Jae-Kwang 한국정보통신학회 2009 한국정보통신학회논문지 Vol.13 No.11
본 논문에서는 무인자동차 시스템 개발을 위하여 적용 가능한 통신을 살펴보고 대안으로 IEEE 802.11a를 제안한다. IEEE 802.11a는 2.4GHz ISM 대역을 사용하는 IEEE 802.11b/g와 달리 5GHz 대 역의 OFDM 변조방식을 사용해 ISM 대역의 IEEE 802.11b/g와 비교하여 간섭으로 인한 성능저하 현상에 강점을 가지고 있으며, 최대 54Mbps의 통신 속도를 제공한다. 무인자동차의 이동성을 보장하기 위한 핵심 요구사항인 로밍 기능을 중점으로 아파트 주차장에서 Soft Roaming과 Hard Roaming방식을 구성하여 실험을 진행하였다. 각각의 실험 결과 값을 토대로 IEEE 802.11a를 무인자동차 시스템에 적용하기 위한 최적의 방법을 제시한다. In this paper, look into the applicable communication for unmanned vehicle system development, and make an alternative idea to IEEE 802.11a. "IEEE 802.11a" is differently from "IEEE 802.11b/g"-which used to 2.4GHz ISM band-as it use OFDM modulation system of 5GHz band, as contrasted with "IEEE 802.11b/g" of ISM band, it has advantage against falling-off the capability caused by interfered, and provide maximum 54Mbps communication speed. Made a priority tested Soft Roaming and Hard Roaming to ensure the sound boom of unmanned vehicle in the flat parking. According to the each effect value, Present a most suitable method of applicable to "IEEE 802.11a" to unmanned vehicle system.
김영혁,허대영,태원필,이재신 한국세라믹학회 2008 한국세라믹학회지 Vol.45 No.6
Lead-free (K0.44Na0.52)(Nb0.86Ta0.10)-0.04LiSbO3 piezoelectric ceramics have been synthesized by conventional sintering process and then investigated on the sintering and piezoelectric properties by high energy ball milling (HEBM) treatment. The powders milled for different time are characterized by XRD, FE-SEM. The powders are pressed into a pellet and sintered. It is found that the piezoelectric properties of sintered specimens are strongly dependent on the milling time. The piezoelectric properties are enhanced by high energy ball milling treatment. The planer electromechanical coupling factor (kp) and piezoelectric constant (d33) of a specimen sintered at 1050oC are 0.44 and 267 pC/N, respectively. Lead-free (K0.44Na0.52)(Nb0.86Ta0.10)-0.04LiSbO3 piezoelectric ceramics have been synthesized by conventional sintering process and then investigated on the sintering and piezoelectric properties by high energy ball milling (HEBM) treatment. The powders milled for different time are characterized by XRD, FE-SEM. The powders are pressed into a pellet and sintered. It is found that the piezoelectric properties of sintered specimens are strongly dependent on the milling time. The piezoelectric properties are enhanced by high energy ball milling treatment. The planer electromechanical coupling factor (kp) and piezoelectric constant (d33) of a specimen sintered at 1050oC are 0.44 and 267 pC/N, respectively.
김영혁,허대영,태원필,이재신,Kim, Young-Hyeok,Heo, Dae-Young,Tai, Weon-Pil,Lee, Jae-Shin 한국세라믹학회 2008 한국세라믹학회지 Vol.45 No.6
Lead-free $(K_{0.44}Na_{0.52})(Nb_{0.86}Ta_{0.10})-0.04LiSbO_3$ piezoelectric ceramics have been synthesized by conventional sintering process and then investigated on the sintering and piezoelectric properties by high energy ball milling (HEBM) treatment. The powders milled for different time are characterized by XRD, FE-SEM. The powders are pressed into a pellet and sintered. It is found that the piezoelectric properties of sintered specimens are strongly dependent on the milling time. The piezoelectric properties are enhanced by high energy ball milling treatment. The planer electromechanical coupling factor ($k_p$) and piezoelectric constant ($d_{33}$) of a specimen sintered at $1050^{\circ}C$ are 0.44 and 267 pC/N, respectively.