AI Fire Detection & Notification System

You-min Na(나유민),Dong-hwan Hyun(현동환),Do-hyun Park(박도현),Se-hyun Hwang(황세현),Soo-hong Lee(이수홍) 한국컴퓨터정보학회 2020 韓國컴퓨터情報學會論文誌 Vol.25 No.12

본 논문에서는 최근 가장 신뢰도 높은 인공지능 탐지 알고리즘인 YOLOv3와 EfficientDet을 이용한 화재 탐지 기술과 문자, 웹, 앱, 이메일 등 4종류의 알림을 동시에 전송하는 알림서비스 그리고 화재 탐지와 알림서비스를 연동하는 AWS 시스템을 제안한다. 우리의 정확도 높은 화재 탐지 알고리즘은 두 종류인데, 로컬에서 작동하는 YOLOv3 기반의 화재탐지 모델은 2000개 이상의 화재 데이터를 이용해 데이터 증강을 통해 학습하였고, 클라우드에서 작동하는 EfficientDet은 사전학습모델(Pretrained Model)에서 추가로 학습(Transfer Learning)을 진행하였다. 4종류의 알림서비스는 AWS 서비스와 FCM 서비스를 이용해 구축하였는데, 웹, 앱, 메일의 경우 알림 전송 직후 알림이 수신되며, 기지국을 거치는 문자시스템의 경우 지연시간이 1초 이내로 충분히 빨랐다. 화재 영상의 화재 탐지 실험을 통해 우리의 화재 탐지 기술의 정확성을 입증하였으며, 화재 탐지 시간과 알림서비스 시간을 측정해 화재 발생 후 알림 전송까지의 시간도 확인해보았다. 본 논문의 AI 화재 탐지 및 알림서비스 시스템은 과거의 화재탐지 시스템들보다 더 정확하고 빨라서 화재사고 시 골든타임 확보에 큰 도움을 줄 것이라고 기대된다. In this paper, we propose a fire detection technology using YOLOv3 and EfficientDet, the most reliable artificial intelligence detection algorithm recently, an alert service that simultaneously transmits four kinds of notifications: text, web, app and e-mail, and an AWS system that links fire detection and notification service. There are two types of our highly accurate fire detection algorithms; the fire detection model based on YOLOv3, which operates locally, used more than 2000 fire data and learned through data augmentation, and the EfficientDet, which operates in the cloud, has conducted transfer learning on the pretrained model. Four types of notification services were established using AWS service and FCM service; in the case of the web, app, and mail, notifications were received immediately after notification transmission, and in the case of the text messaging system through the base station, the delay time was fast enough within one second. We proved the accuracy of our fire detection technology through fire detection experiments using the fire video, and we also measured the time of fire detection and notification service to check detecting time and notification time. Our AI fire detection and notification service system in this paper is expected to be more accurate and faster than past fire detection systems, which will greatly help secure golden time in the event of fire accidents.

A Study on the Energy Demand Investigation of Gaeseong Industrial Complex

You Do-Hyun(유도현),Cho Nam-Cheol(조남철),Shin Kum-Cheol(신금철),Han Jeong-Ok(한정옥) 한국태양에너지학회 2017 한국태양에너지학회 학술대회논문집 Vol.2017 No.4

TiO₂-Nb₂O? 솔의 물성에 대한 분석

柳道鉉(Do-Hyun You) 대한전기학회 2006 전기학회논문지C Vol.55 No.7

TiO₂-Nb₂O? sol was prepared using sol-gel method. Crystalline properties of gel powder changed from rutile phase to anatase phase with increasing Nb₂O? additives at 800℃, while they retained rutile phase regardless of Nb₂O? additives at 900℃, 1,000℃. They retained amorphous phase from 50℃ to 400℃, retained anatase phase from 500℃ to 600℃ and had rutile phase over 700℃ at 1mole% Nb₂O? additive. After TiO₂-Nb₂O? sol retained low viscosity with normal chain structure for a long time, its viscosity increased fast with network structure. DTA properties of gel powder had endothermic reaction due to evaporation of propanol and water about 78℃, had exothermic reaction due to propanol combustion about 290℃ and had exothermic reaction due to changing of TiO₂ phase about 640℃.

소형 튜블러 수차의 가이드베인 깃수의 영향

전현태(Hyun-Tae Jeon),남상현(Sang-Hyun Nam),김유택(You-Taek Kim),최영도(Young-Do Choi),남청도(Chung-Do Nam),이영호(Young-Ho LEE) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5

Recently, Small hydropower attracts attention because of its clean, renewable and abundant energy resources to develop. This study is about tubular-type hydro turbine among renewable energy that is based on using the different water pressure levels in pipe lines. The purpose of this study is to investigate the influence of number of guide vane on the turbine performance, output power, and efficiency of tubular-type hydroturbine.

V₂O? 첨가가 TiO₂ 세라믹스의 물성에 미치는 효과

유도현(You Do Hyun) 대한전기학회 2007 대한전기학회 학술대회 논문집 Vol.2007 No.11

TiO₂-V₂O? sol was fabricated using sol-gel method and TiO₂-V₂O? thin films were fabricated using dip-coating method. V₂O? sol was added 0.01mole, 0.03mole, 0.05mole into TiO₂ sol. Viscosity of sol increased fast from about 1,000 minutes and sol began gelation from about 10,000 minutes. As a results of crystalline properties, V₂O? peaks were not found despite of V₂O? addition. Endothermic reaction occurred due to evaporation of solvent and dissocia- tion of OH at 80℃. Exothermic reaction occurred due to combustion and oxidation of solvent at 230℃, occurred to combustion and oxidation of alkyl group at 350℃. Thickness of thin films increased 0.1~0.25㎛ every a dipping.

솔젤법에 의해 제작된 TiO₂박막 특성

유도현(Do-Hyun You) 한국진공학회(ASCT) 2001 Applied Science and Convergence Technology Vol.10 No.2

본 연구에서는 솔젤법에 의해 최적의 유전특성을 갖는 TiO2 박막의 제작조건을 정한다. 이를 위해 최적의 조건으로 합성된 sol을 이용하여 박막을 제작한 후 박막의 유전율을 측정한다. 가수분해에 필요한 물의 양이 화학 양론적인 양보다 적은 경우에는 직쇄상 구조를 갖는 투명 sol이 생성되고 많은 경우에는 cluster상 입자를 갖는 현탁 sol이 생성된다. 또한 박막의 유전율은 120℃부근을 시작으로 지수함수적으로 증가하는 것을 알 수 있다. In this study, synthesis condition of TiO2 thin films which have optimal dielectric characteristics using sol-gel method was determined. Thin films were fabricated using sol which have optimal characteristics and their permittivity was measured. In case of the amount of water for hydrolysis smaller than that for stoichiometry, sol formed clear sol which have normal chain structure. On the contrary, in case of the amount of water for hydrolysis larger than that for stoichiometry, sol formed suspended sol which have cluster structure. The permittivity of thin films increased exponentially around 120℃.

감습특성이 우수한 금속산화물계 습도센서 연구

유도현(Do-Hyun You) 대한전기학회 2009 전기학회논문지 Vol.58 No.10

TiO₂ films are fabricated using silk printing method. Heat treatment temperature of films is 600[℃]. From the analysis of microstructure, grain size of TiO₂ films is about 0.2∼0.3[㎛]. Thickness of films is 30.19[㎛] and surface uniformity of films is good. From the analysis of crystalline structure, TiO₂ films transform anatase phase to rutile phase. Capacitance of films increases according to increase relative humidity and decrease measuring frequency. Hysteresis characteristics of capacitance and impedance are best at 45[%RH] and 75[%RH] respectively. Impedance of films increases according to decrease measuring frequency.

3D 프린터의 출력 품질 향상에 대한 연구

유도현(Do-Hyun You),박구범(Gu-Bum Park) 대한전기학회 2019 전기학회논문지 Vol.68 No.12

This study proposes the optimum printing conditions for 3D printing to the thickness set by the slice program using FDM-type 3D printer. It can be seen that both the PLA and the ABS filaments have a flow rate of 110% which is closest to the set layer height of 0.2mm. For PLA cubes, the flow rate closest to the volume of 1000mm³ when the horizontal×length×height is set to 10mm each is 90%, and the flow rate closest to the volume of 8000mm³ when the horizontal×length×height is set to 20mm each is 90%. For ABS cubes, the flow rate closest to the volume of 1000mm³ when the horizontal×length×height is set at 10mm each is 80% and the flow rate closest to the volume of 8000mm³ when the horizontal×length×height is set at 20mm each is 80%. From the results of additive microstructure between layers of the PLA cube, the average thickness of a layer is approximately 185μm(=0.185mm) when width×length×height is set at 10mm and 20mm respectively. The end parts of the layer of the PLA cube are regularly rounded. The average thickness of a layer of the ABS cube is the same as that of the PLA cube. The end parts of the layer of the ABS cube are thickly rounded, and the other is thinly rounded.

솔젤법으로 제작한 TiO₂-V₂O₅ 세라믹스의 물성

柳道鉉(Do-Hyun You) 대한전기학회 2007 전기학회논문지 Vol.56 No.7

TiO₂-V₂O? sol was prepared using sol-gel method. Sol changed to gel with hydrolysis and polymerization. DTA properties of gel powder had endothermic reaction due to evaporation of propanol about 80℃, had exothermic reaction due to combustion of propanol about 230℃ and had exothermic reaction due to combustion of alkyl group about 350℃. Crystalline properties of gel powder retained amorphous phase at 50℃, retained anatase phase from 400℃ to 600℃ and had all rutile phase over 700℃ at 0.01mole V₂O? additive. The capacitance of thin films increased with increasing heat treatment temperature and thin films had best properties at 700℃. The capacitance of thin films increased a lot with decreasing measurement frequency.

자동차 내부의 김서림 감지 및 제거를 위한 최적의 조건

유도현(Do-Hyun You) 대한전기학회 2012 전기학회논문지 Vol.61 No.5

For mist sensing, temperature-humidity sensor is attached on six positions of front glass and rearview mirror in automobile. Bottom-left side of front glass is the best position where mist is sensing. For mist removal, air conditioner is turned on intensity 1, 3 and is set the temperature at 17[℃], 25[℃]. And heater is turned on intensity 1, 3 and is set the temperature at 25[℃], 32[℃]. The best condition which mist is removed is temperature at 17[℃] and intensity 3 of air conditioner mode. At this condition, total average value of humidity output voltage difference is 0.561[V]. Also, air conditioner mode is effective than heater mode for mist sensing and removal.