• 한국멀티미디어학회논문지
• /
• 제18권8호
• /
• pp.935-942
• /
• 2015

According to growing of the plant cultivation in a greenhouse environment, the demand of a system to control the greenhouse easier has increased. Currently, the methods to control by the mobile App represent the information in a greenhouse environment with a simple numerical data or compose only the contents with a limited degree of freedom. In order to solve these problems, this paper presents a system that can be viewed or controlled greenhouse conditions in near / remote distance using augmented reality and MQTT communication protocol, RTSP media streaming protocol. The proposed method is implemented in Android smartphone environment and acts monitoring the information (temperature, humidity, illuminance) obtained by greenhouse's sensors and transmits the real time greenhouse's video using RTSP in the remote distance, and controls the values of temperature, humidity, illuminance for the greenhouse using the augmented reality in the near distance.

• Food Science and Biotechnology
• /
• 제18권5호
• /
• pp.1243-1252
• /
• 2009

User-friendly software was developed to determine the shelf-life of perishable Korean seasoned side dishes in real time based on growth models of spoilage and pathogenic microorganisms. In the program algorithm, the primary spoilage and fastest-growing pathogenic organisms are selected according to the product characteristics, and their growth is simulated based on the previously monitored or recorded temperature history. To predict the growth of spoilage organisms with confidence limits, kinetic models for aerobic bacteria or molds/yeasts from published works are used. Growth models of pathogenic bacteria were obtained from the literature or derived with regression of their growth rate data estimated from established software packages. These models are also used to check whether the risk of pathogenic bacterial growth exceeds that of food spoilage organisms. Many example simulations showed that the shelf-lives of the examined foods are predominantly limited by the growth of spoilage organism rather than by pathogenic bacterial growth.

• 한국전기전자재료학회:학술대회논문집
• /
• 한국전기전자재료학회 2010년도 하계학술대회 논문집
• /
• pp.115-115
• /
• 2010

This paper introduces a measurement system that measures behavior and electrical characteristics of overhead contact line irregular sections in real-time. For verification, we developed a prototype of the real-time overhead contact line irregular section behavior measurement system and a monitoring system for field tests. The current and temperature of contact wires and messenger wires were measured real-time by applying the system at KTX a commercial line. Therefore, acquiring data is possible with the developed system and this system that measures one of the fundamental and key factors, the catenary current, should be applicable to various areas such as detecting characteristics for designing overhead contact lines, enhancing speed, and enhancing energy.

• 한국정보통신학회논문지
• /
• 제22권6호
• /
• pp.895-902
• /
• 2018

건물에 의한 에너지 소비량은 미국 및 일본 등 선진국에서는 전체 국가 에너지 소비량의 40%에 육박하고 있으며, 우리나라에서도 전체 에너지 소비량의 24%를 차지하고 있는 것으로 보고되고 있다. 빌딩에서 HVAC (Heating, Ventilation, and Air conditioning)은 필요 열량에 따라 냉각 유량을 자유롭게 제어할 수 없기 때문에 에너지가 효율적으로 사용되지 않고 있다. 따라서 에너지 절감 밸브를 사용함으로써 유량을 필요한 열량만큼 제어하여 에너지를 절감할 수 있다. 본 논문에서는 에너지 절감 밸브를 개발하기 위한 기본적인 상태를 정의하고 저전력, 고 가성비의 PIC 프로세서 기반의 빌딩 에너지 절감 밸브용 제어 및 감시 보드를 개발한다. 설계된 보드는 온도차 측정을 위한 2개의 온도 값과 유량 값 및 계산된 열량에 관한 정보를 실시간으로 디스플레이 및 전송한다. 개발된 제어 감시 보드는 향후 밸브의 상태를 실시간으로 파악하거나 해상용 밸브 등을 개발하는 데 유용하게 사용될 것이다.

• 한국기계가공학회지
• /
• 제19권4호
• /
• pp.16-23
• /
• 2020

An electric vehicle operates at high currents and requires real-time monitoring of the entire system for ensuring efficiency and safety of the vehicle. Current sensors are applied to drive the motors, inverters, and battery control systems, and are the key components to ensure constant monitoring of the magnitude and waveforms of the operating current. In this study, a heat treatment process condition to influence the performance of Permalloy current sensors was developed; the correlation between the output capacity, low-temperature characteristics, and high-temperature characteristics of the current sensor was studied; and the process was optimized to meet the required output accuracy and temperature characteristics.

• 한국철도학회:학술대회논문집
• /
• 한국철도학회 2008년도 춘계학술대회 논문집
• /
• pp.948-951
• /
• 2008

Ubiquitous sensor network (USN) based on ZigBee communication protocol has been used in various application fields, such as home-network, intelligent building and machine, logistics, environmental monitoring, military field, security field and etc. The ZigBee is targeted at radio-frequency application that require a low data rate, long battery life and secure network. Especially, the USN system can be applied efficiently to building-indoor where the complex geometry is adopted. In this study, all 90 points of railway cabin indoor were monitored for temperature and humidity using USN technology. All sensors were pre/post-calibrated and the temperature/humidity change were analyzed in a railway cabin in real-time. The results would be useful to develop the cabin heating, ventilating and air conditing (HVAC) system to meet all passengers' thermal comfort regardless of their seat position.

• 수산해양교육연구
• /
• 제28권2호
• /
• pp.376-383
• /
• 2016

In this paper, the blue-green algae monitoring program of applying IoT(Internet of things) technologies is designed and implemented that can check out the status of the river's water quality in real time. The proposed system is to extract the image data from the camera of raspberry pi by an wireless network, and it is analyzed through the HSV color model. We measure the temperature using a DS18B20 1-wire temperature sensor. The extracted information of image data and temperature is then analyzed in C and Python programs for use with Raspberry Pi. The XML data in PHP program is made from the analyzed information and provides Web services. It also allows to refer the XML data using mobile devices.

• 한국지반환경공학회 논문집
• /
• 제16권6호
• /
• pp.39-43
• /
• 2015

This study extends the Distributed Temperature Sensing (DTS) application to delineate the saturated zones in shallow sediment and evaluate the groundwater flow in both downward and upward directions. Dry, partially and fully saturated zones and water level in the subsurface can be recognized from this study. High resolution seepage velocity in vertical direction was estimated from the temperature data in the fully saturated zone. By a single profile, water level can be detected and seepage velocity in saturated zone can be estimated. Furthermore, thermal gradient analysis serves as a new technique to verify unsaturated and saturated zones in the subsurface. The vertical seepage velocity distribution in the recognized saturated zone is then analyzed with improvement of Bredehoeft and Papaopulos' model. This new approach provides promising potential in real-time monitoring of groundwater movement.

• 한국수자원학회논문집
• /
• 제38권8호
• /
• pp.655-664
• /
• 2005

저수지를 통한 수자윈의 지속적 확보와 이용에 걸림돌이 되고 있는 탁수의 장기발생문제를 기술적으로 해결하고자 실시간 탁수 감시와 예측시스템(RTMMS)을 구축 중이며, 2004년 홍수기 동안 대청호를 대상으로 유입하는 탁수의 수리 및 수질특성을 조사하고 2차원 횡방향 평균 수리 및 수질모형인 CE-QUAL-W2(W2)를 적용하여 탁수의 밀도류 거동과 시${\cdot}$공간적 분포를 예측하고 실측값과 비교하여 모형의 적용가능성을 평가하였다. 강우사상 동안 하천 수온은 $5{\sim}10^{\circ}C$ 정도 하강하였으며 탁수가 저수지내에서 밀도류를 형성하는 원인으로 작용했다. 적용된 W2모형은 수온의 성층구조 변화와 탁수의 침강점, 도달시간, 중층밀도류 두께 등 탁수의 거동특성을 비교적 잘 모의하였다. 그러나 국부적으로 탁수가 위치한 중층과 탁수 유입 전에 형성되었던 전이층에서 수온과 탁도의 모의값과 실측값이 유의할 만한 오차를 보였다. 펜티엄급 PC(CPU 2.0GHz)로 홍수기 전체기간 모의에 소요된 시간은 약 4분으로써 모형은 계산의 효율성 측면에서 실시간 모의에 적합한 것으로 평가된다.

• 한국전자통신학회논문지
• /
• 제14권3호
• /
• pp.579-586
• /
• 2019

본 연구는 지진 및 화재 등과 같은 천재지변이 발생되었을 때, 드론을 통하여 신속한 인명 구조를 판단하는데 목적이 있다. 재난현장에서의 모니터링을 위해 라이더, 온도, 유해가스 센서 및 무선카메라가 장착된 드론이 애플리케이션 서버에 등록되고, 구조 인원이 활동하기 이전에 현장의 상황을 파악하기 위하여 실시간으로 모니터링 기능을 수행 한다. 모니터링을 통해 인명구조를 위한 사람이 발견되었을 경우, 애플리케이션 서버는 효율적인 구조를 위해서 실시간 영상 정보를 제공 한다.