• Journal of the Korea Academia-Industrial cooperation Society
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• v.15 no.6
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• pp.3832-3840
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• 2014

The rapidly aging population is also increasing the number of dementia patients rapidly. Studies have revealed the early signs of slowing progress. Therefore, dementia patient safety, continuous care, daily living, and health care are becoming more important. In this paper, a smart home care system using smart phones and Bluetooth communication technology was used to monitor the state of dementia patients of based on the results of grading dementia, health care of the dementia patients at home and provide for the safety of the system using motion sensors and gas leak sensors to respond to various emergency situations, such as fire, gas leak protection, and loitering. Using this system, the patient can stay longer in their home due to the nature of Korean culture before admission, while reducing the family's economical, physical and psychological burden and allowing the consultation of specialists through the system by building a database of individuals and providing professional service and specialty care referral agencies through the link.

• The Journal of the Korea institute of electronic communication sciences
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• v.12 no.1
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• pp.147-154
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• 2017

This paper aims to build a home security system based on IoT to monitor a home on a mobile phone. The system consists of data gathering sensors, camera, gateway and Xively platform. The Raspberry Pi collects data from the three sensors and sends the data to Xively, and sends the video stream of home to a client in a smart phone through a internet. The servers are composed of Xively, socket server in Raspberry Pi and E-mail server in Google. The proposed system transmits e-mail, text message, and video stream when there are motion, fire, and gas leakage, and can control the gas valve through Raspberry Pi. The experimental results show that a user gets 'emergency E-mail' and text message and watches the video stream of the home through WIFI or LTE on a smart phone.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.19 no.1
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• pp.77-83
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• 2019

Major causes of industrial accidents include falls and gas leak. The existing safety helmet and smart device combination products are focused on convenience, so the functions to prevent such accidents are insufficient. We developed a smart helmet focusing on fall accident detection and gas leak detection. We also developed management system to manage workers efficiently. Its core function is to detect dangerous conditions of employees, to communicate with managers and to confirm the situations of workers. The effectiveness of the combustible gas measurement capability was verified through experiments. However, since a significant amount of power consumption is founded due to continuous operation of the board and the sensor, countermeasures such as replacing with a large capacity battery are required.

• Journal of the Society of Disaster Information
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• v.12 no.2
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• pp.122-129
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• 2016

In this study, a dual structured pipe for a preventive monitoring on a accident damage, a smartphone app program for a survey and a construction data collection and a server program for a real-time monitoring were developed. A pilot system was installed in the test field to analyze effects of a system developed in this study. The data for a damage prevention was detected by the attached sensors on the pipe. Exclusion was tested by the pressure sensors to be installed at regular intervals. The app and server programs was enabled to the real-time data collection and real-time monitoring linked by VRS survey equipments and a smartphone.

• Journal of the Korean Institute of Gas
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• v.12 no.2
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• pp.38-41
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• 2008

In this research, we propose a new method for tracking the release rate using the concentration data obtained from the sensor. We used a sensor network that has already been set surrounding the area where hazardous gas releases can occur. From the real-time sensor data, we detected and analyzed releases of harmful materials and their concentrations. Based on the results, the release rate is estimated using the neural network. This model consists of 14 input variables (sensor data, material properties, process information, meteorological conditions) and one output (release rate). The dispersion model then performs the simulation of the expected dispersion consequence by combining the sensor data, GIS data and the diagnostic result of the source term. The result of this study will improve the safety-concerns of residents living next to storage facilities containing hazardous materials by providing the enhanced emergency response plan and monitoring system for toxic gas releases.

• Proceedings of the KIEE Conference
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• 2008.10b
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• pp.223-224
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• 2008

건축물 내에서 가스사용량, 가스압력 및 밸브상태 등을 점검 할 수 있는 안전기능을 갖춘 유비쿼터스 기반 지능형 가스미터를 개발하고, 이를 유선 RS-485와 무선 ZigBee(2.4GHz) 통신모듈을 탑재한 시스템 및 망을 구성하여 원격지에서 양방향으로 유비쿼터스 통신방식을 이용하여 원격검침, 가스누출검지, 지진감지에 의한 내부밸브 차단 및 개방과 위험통보등의 기능을 수행할 수 있게 하였다. 개발시제품과 데이터를 바탕으로 시스템운용 통신 토폴로지, 구현방법, 실험결과를 소개하고, 이 시스템의 보급을 통하여 가스사고 예방에 힘쓰고자 한다.

• Proceedings of the Korea Contents Association Conference
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• 2017.05a
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• pp.383-384
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• 2017

재난 재해 조기 예 경보시스템은 산불, 홍수, 지진, 화재, 붕괴, 가스 누출 등 다양한 재난 재해가 발생할 확률이 있거나 발생하였을 경우 다양한 매체를 이용하여 신속하게 이와 관련된 정보를 전파하는 시스템을 의미한다. 재난 재해 조기 예 경보시스템은 기후 변화와 현대 사회의 발전의 고도화로 각종 다양한 재난 재해의 발생이 매년 급증하고 있어 이에 대해 국민의 생명과 재산을 보호하기 위해 필요성이 날로 증가하고 있으며, 이와 관련된 재난통신, 단말기, 시스템의 시장규모는 지속적으로 빠르게 성장하고 있다. 최근 들어 IoT를 이용한 다양한 센서 디바이스를 활용하여 재난 재해 상황, 기상상황, 전염병 상황정보 등을 광범위하게 감지하고 분석함으로써 미래 적용 가능성이 상당히 높게 나타나고 있다.

• The KSFM Journal of Fluid Machinery
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• v.11 no.1
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• pp.26-32
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• 2008

The safe operation of high pressure pipe line systems is of significant importance. Leaks due to faulty operation from the pipelines can lead to considerable product losses and to exposure of community to dangerous gases. There are several leak detection methods of pipeline network which have recently been suggested. The negative pressure wave detection technology, which has advantages of short time detection availability, accurate leaking location estimate capability and cost effective, is concentrated in this study. Theoretical analysis of the flow characteristics for leaking through a hole on the pipe wall has been performed by using Fluent 6.3, commercial CFD package. The results of 3-dimensional analysis near leaking hole confirm the occurrence of negative pressure wave, and the results of 2-dimensional analysis verify the characteristics of propagation of the wave which travels with speed equal to the speed of sound in the pipeline contents. Characteristics of leakage and pressure in a pipe with a hole have been analyzed for the various pipe and hole sizes.

• Fire Science and Engineering
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• v.33 no.4
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• pp.97-104
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• 2019

Behind the growth of the chemical industry which is a cornerstone of the Korean economy, dozens of hazardous and noxious chemical accidents occur every year, resulting in enormous casualties and environmental damages. Many cases among chemical accidents are caused by the carelessness of workers in handling facilities such as hydrochloric acid and hydrofluoric acid, and the aging of handling facilities. In order to mitigate the damage by such chemical accidents, a safety system for preventing atmospheric diffusion of hazardous and xoxious chemicals in dike was proposed. The atmospheric diffusion prevention safety system consists of leak detection phase, alarm and measurement phase, suppression and blocking phase. Through the proposed the atmospheric diffusion prevention safety system, the need for 2nd chemical accident prevention such as atmospheric diffusion in dike can be posed.

• Journal of the Institute of Electronics Engineers of Korea SC
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• v.48 no.3
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• pp.13-20
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• 2011

In this paper, we proposed a system to raise gas safety management by using the wireless communication module and intelligent gas safety appliances. Our designed systems configure a micom-gas meter, an automatic extinguisher, sensors, and a wallpad. A micom-gas-meter monitors gas flow, gas pressure, and earthquake. An automatic fire extinguisher checks gas(combustible) leaks and temperature of $100^{\circ}C$ and $130^{\circ}C$. Sensors measure smoke and CO gas. In our novel system, a micom-gas meter cut off inner valve with warnings, an automatic fire extinguisher cut off middle valve and spray extinguishing materials, and sensors generate signals for smoke and CO when occurring gas risk. Gas safety appliances and sensors takes safety measures, and transmit those signal to a wallpad. The wallpad again transmit signal like events to a control server. Users can connect web pages for gas safety through B-ISDN and control and manage them. We hereby devised scenarios for gas safety and risk management, and demonstrated their effectiveness through experiments.