• Journal of Biosystems Engineering
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• 제36권4호
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• pp.279-284
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• 2011

Protected vegetable production area is greater than 26% of the total vegetable production area in Korea, and portion of protected production area is increasing for flowers and fruits. To secure stable productivity and profitability, continuous and intensive monitoring and control of protected crop production environment is critical, which is labor- and time-consuming. Failure to maintain proper environmental conditions (e.g., light, temperature, humidity) leads to significant damage to crop growth and quality, therefore farmers should visit or be present close to the production area. To overcome these problems, application of remote monitoring and control of crop production environment has been increasing. Wireless monitoring and control systems have used CDMA, internet, and smart phone communications. Levels of technology adoption are different for farmers' needs for their cropping systems. In this paper, potential of wireless remote monitoring of protected agricultural environment using CDMA SMS text messages was reported. Monitoring variables were outside weather (precipitation, wind direction and velocity, temperature, and humidity), inside ambient condition (temperature, humidity, $CO_2$ level, and light intensity), irrigation status (irrigation flow rate and pressure), and soil condition (volumetric water content and matric potential). Scenarios and data formats for environment monitoring were devised, tested, and compared. Results of this study would provide useful information for adoption of wireless remote monitoring techniques by farmers.

• Journal of Advanced Marine Engineering and Technology
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• 제33권5호
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• pp.746-755
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• 2009

Recently, NMEA2000 became the de facto standard of the communication protocol for the instrument level network in vessels, and it is anticipated that most of the vessels will be equipped with the sensors and actuators based on this protocol. The conventional serial communication specifications such as RS-232, RS-485, or even NMEA0183 are single-talker/multiple-listener and interconnection among multiple sensors and/or actuators usually results in a bundle of wires. On the other hand, NMEA2000 is a true bus type(multiple-talker/multiple-listener) protocol and theoretically up to 256 instruments can be hot-plugged. With the advent of the protocol, it is necessary to consider a new type of monitoring system for the instruments in vessels: In most traditional serial communication environments, a dedicated monitor or user interface was necessary for each sensor or actuator as it was simply not easy to collect data in a single place. With NMEA2000, the collection of various types of information is simple. An embedded system can be employed to combine, to arrange and to display informations from various types of devices. Assuming that the actuators and sensors on a vessel are interconnected by NMEA2000 standard, we devise a tentative interactive vessel monitoring system in which the following 4 kinds of informations are collected and delivered: the navigation, engine, weather and tanks informations.

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 1998년도 Proceedings of International Symposium on Remote Sensing
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• pp.280.2-286
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• 1998

Flood is the main natural disaster mostly in the world. It is a care problem to prevent flood disaster generally. The frequency of flood disaster is high and the distributing field is wide, the 50 percent population and 70 percent properties distribute at the threaten field of flood disaster in China. Flood disaster has caused a huge amount of economical losses and these losses have an increasing trend. Along with the development of reducing natural disaster action, it has become one of the most attentive problems for monitoring flood, preventing flood and forecasting flood efficiently. Remote sensing has the characteristics of large spatial observing areas, wide spectrum ranges, and imaging far away from the targets, imaging capabilities all weather. Spatial remote sensing information, which records the full, processes of the disaster's occurrence and development in real-time. It is a scientific basis for management, planning and decision-making. Through systemic analyzing the RS monitoring theory, based on compounding RS information, the technology and method of monitoring flood disaster are studied.

• International journal of advanced smart convergence
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• 제12권2호
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• pp.153-158
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• 2023

Most agriculture plantings are based on traditional farming and demand a lot of human work processes. In order to improve the efficiency as well as the productivity of their farms, modern agricultural technology was proven to be better than traditional practices. Internet of Things (IoT) is usually related in modern agriculture which provides the farmer with a real-time monitoring condition of their farm from anywhere and anytime. Therefore, the application of IoT with a sensor to measure and monitors the humidity and the temperature in the mushroom farm that can overcome this problem. This paper proposes an IoT based monitoring system forindoor Ganoderma lucidum cultivation at a minimal cost in terms of hardware resources and practicality. The results show that the data of temperature and humidity are changing depending on the weather and the preliminary experimental results demonstrated that all parameters of the system were optimized and successful to achieve the objective. In addition, the analysis results show that the quality of Ganoderma lucidum produced on the research method conforms to regulations in Vietnam.

• 한국지구과학회지
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• 제43권3호
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• pp.386-404
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• 2022

2011년 4월 29일부터 30일까지 몽골에서 발원한 황사의 영향으로 우리나라는 4일간 전국적으로 고농도의 황사가 관측되었다. 본 연구는 몽골의 황사발원지에서 황사 발생 시 기상 조건과 고농도 황사 사례의 원인 및 특성을 알아보기 위한 것으로, 황사 일기도 자료, 황사감시기상탑 자료, 위성 자료, 후방공기궤적 자료, 관측자료(PM₁₀ 및 광학입자 계수기 자료), ECMWF 재분석 자료를 이용하였다. 분석 결과, 종관 분석에서는 몽골 중부지역에 등압선의 간격이 조밀하게 분포하고 기압경도력이 강해지면서 강풍에 의해 황사가 발원하였다. 황사 발원과 기상 조건의 관계에서 황사 발원 직전에는 10℃ 이상으로 비교적 높은 기온을 나타내다 황사 발원과 동시에 급감하였으며, 상대습도는 약 40% 이하의 낮은 값을 지속적으로 나타내다 황사 발원 후에는 50% 이상으로 급격히 높아지며 황사의 발생이 줄어드는 경향을 보였다. COMS에서 관측된 황사지수는 황사발원지에서는 25 이상을 나타내면서 고농도의 황사가 탐지되었고, 실황에서 목측으로 관측된 지점과 일치하였다. 72시간 후방공기궤적에서는 모두 북서 기류가 한반도로 유입되었고, 5월 2일 흑산도에서는 PM₁₀의 시간평균농도가 1,025 ㎍ m^-3으로 최고 농도를 보였다. 특히 운동학적 연직 분석에서, 상층에서 발달한 기압골과 저기압성 소용돌이도에 의해 지상 저기압이 강화되고 동시에 상승 기류의 발달이 고농도의 황사 발생에 큰 역할을 한 것으로 판단된다.

• 한국전자통신학회논문지
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• 제10권1호
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• pp.55-64
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• 2015

풍력시장은 매년 연 30%정도의 고도 성장률을 보이고 있으며, 점차 늘어나고 있는 추세이다. 국내 풍력발전기 설치 총량은 380MW로 전 세계시장의 0.2%의 점유율을 보이고 있다. 그러나 국내에 설치된 풍력발전기의 90%이상이 해외기업 제품이다. 또한 해상 풍력 발전소 설치를 위한 사전 조사 시스템에 적용되는 데이터로거도 대부분 해외기업 제품으로 막대한 비용이 해외로 유출되는 실정이다. 이에 본 논문에서는 풍력 발전기건설 업무의 효율성과 투자 비용절감을 위한 사전 기상자원 측정 시스템을 제안한다. 사전 기상자원 측정 시스템은 기상탑의 기상 관측 데이터로거 H/W와 무선 브리지, 기상탑 주변의 풍향, 풍속, 온 습도, 일사량, 데이터로거의 전력 상태를 모니터링할 수 있며, 측정된 데이터를 분석할 수 있는 Wind Rose S/W로 구성된 무선 통신(Wifi)기반의 해양 기상자원 측정 데이터로거 및 분석 모니터링 시스템이다.

• 천문학회보
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• 제37권1호
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• pp.89.2-89.2
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• 2012

Radiation Belt, discovered by Van Allen in 1958, is a region energetic particles are trapped by the Earth's magnetic field. To measure charged particles and fields in the radiation belt, RBSP(Radiation Belt Storm Probes) mission will be launched in September 2012 by NASA. RBSP mission consists of two spacecraft having orbit from 600 km to 30,000 km and rotates the Earth twice a day. This mission is not designed just for scientific purpose but have operational function broadcasting real time data for space weather monitoring. As a program of KASI-NASA cooperation, KASI is constructing RBSP data receiving antenna that will be installed by April in Daejeon. With this antenna system, NASA can receive RBSP data for 24 hours and KASI also get space weather information to protect Korean GEO satellites. In this presentation, we will discuss how we use RBSP data for space weather forecasting. In addition, we will talk about science topics that can be achieved by RBSP mission. Especially we focus on the dusk-side electron precipitation that has been considered as a main mechanism of electron dropout events. We show the dusk-side precipitation is closely associated with radiation belt electron loss with NOAA-POES data, and why RBSP mission is important to understand radiation belt physics.

• 한국지구과학회지
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• 제29권7호
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• pp.567-578
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• 2008

온대저기압화는 중위도 기압계에 큰 영향을 주고 때로는 악기상의 원인이 되기도 한다. 그러나 온대저기압화에 대한 예보와 연구 양쪽 모두 많은 과제가 남아있다. 왜냐하면 태풍으로부터 변질된 온대저기압 자체의 모호한 형태 때문이다. 또한, 온대저기압화의 정의가 예보나 연구 양쪽 모두 만족시켜줄 만큼 정확하지도 않다 따라서 기상청은 2007 년에 "온대저기압화 현엽매뉴얼"을 개발하여 온대저기압화의 일련의 과정과 구조 변화 진단에 사용하였다. 이 매뉴얼에서는 1단계 최대풍속과 해수면온도, 2단계 위성영상, 3단계 단열선도, 그리고 최종단계인 4단계에서 지상일기도를 분석하였다. 이 현업매뉴얼은 온대저기압화가 일어날 때 구조변화의 이해와 감시에 도움이 될 것이다.

• 한국농림기상학회지
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• 제3권1호
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• pp.37-43
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• 2001

Crop status monitoring and yield prediction at higher spatial resolution is a valuable tool in various decision making processes including agricultural policy making by the national and local governments. A prototype crop forecasting system was developed to project the size of rice crop across geographic areas nationwide, based on daily weather pattern. The system consists of crop models and the input data for 1,455 cultivation zone units (the smallest administrative unit of local government in South Korea called "Myun") making up the coterminous South Korea. CERES-rice, a rice crop growth simulation model, was tuned to have genetic characteristics pertinent to domestic cultivars. Daily maximum/minimum temperature, solar radiation, and precipitation surface on 1km by 1km grid spacing were prepared by a spatial interpolation of 63 point observations from the Korea Meteorological Administration network. Spatial mean weather data were derived for each Myun and transformed to the model input format. Soil characteristics and management information at each Myun were available from the Rural Development Administration. The system was applied to the forecasting of national rice production for the recent 3 years (1997 to 1999). The model was run with the past weather data as of September 15 each year, which is about a month earlier than the actual harvest date. Simulated yields of 1,455 Myuns were grouped into 162 counties by acreage-weighted summation to enable the validation, since the official production statistics from the Ministry of Agriculture and Forestry is on the county basis. Forecast yields were less sensitive to the changes in annual climate than the reported yields and there was a relatively weak correlation between the forecast and the reported yields. However, the projected size of rice crop at each county, which was obtained by multiplication of the mean yield with the acreage, was close to the reported production with the $r^2$ values higher than 0.97 in all three years.

• 한국컴퓨터정보학회논문지
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• 제11권3호
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• pp.203-211
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• 2006

오늘날 네트워크는 전 세계적으로 광범위하게 퍼져있으며, 기업 서버에서부터 심지어 가정의 가전제품까지 우리 생활의 대부분의 기기들이 네트워크로 연결되는 상황에 이르렀다. 따라서 실시간으로 네트워크 상태를 파악하고 계획, 관리할 수 있는 프레임워크의 중요성이 날로 증가하고 있다. 네트워크 상황을 실시간으로 파악하고 지속적으로 최적의 상태를 유지할 수 있는 기술은 네트워크 운영의 고도화 측면에서 가장 근본적이며 핵심적인 요소이다. 고속도로 교통관제 센터의 역할과 유사하게 그물처럼 연결된 네트워크를 한눈에 파악할 수 있는 네트워크 상태보고 프레임워크가 효과적으로 구축되어 있다면 바이러스나 웜으로 인한 급격한 트래픽의 증가 또는 서비스 거부공격 등의 긴급 상황에 빠르게 대처할 수 있고, 트래픽 통계 데이터의 분석을 통해서 네트워크의 확장이나 병목구간 등을 미리 파악할 수 있을 것이다. 본 논문에서는 네트워크 트래픽과 성능 상태를 실시간으로 모니터링하고, 동적으로 보고를 해주는 네트워크 상태보고 시스템의 구조를 제시하였다. 이를 위해서 각 네트워크 세그먼트 단위에 이동성을 제공하는 지능형 에이전트를 구축하고 이를 통하여 전체 네트워크의 상태를 효과적으로 제공하는 프레임워크를 제안하였다.