• 한국정보통신학회논문지
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• 제12권7호
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• pp.1321-1328
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• 2008

본 논문에서 제안된 미들웨어는 상황인지와 이벤트 중심적인 구조에 초점을 맞춰 돈사와 같은 농업 서비스를 위한 모니터링 및 제어 시스템이다. u-Farm 미들웨어는 센서 필드로부터 얻어진 상황정보를 모니터링하고 처리함으로써, 농업 애플리케이션 서비스로부터의 다양한 쿼리에 대하여 즉각적인 응답을 제공한다. 이러한 시스템은 제어 장치로 하여금 최적의 유비쿼터스 농업 환경을 제공할 수 있도록 적합한 액션을 취하게 한다.

• Journal of Biosystems Engineering
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• 제39권3호
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• pp.194-204
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• 2014

Purpose: The aim of this study was to develop long-term storage technology for Chinese cabbage in order to extend the period of availability of freshly harvested products. The scope of the paper deals with the use of a cooler with a remote monitoring and control interface in conjunction with use of packaging film. Methods: A cooler with a real time monitoring system was designed as a low-temperature storage facility to control temperature and relative humidity (RH). The effects of storage in high-density polyethylene (HDPE) plastic boxes, 3% chitosan dipping solution, polypropylene film (PEF) with perforations, and mesh packaging bags on physiological responses were investigated. The optimal storage temperature and humidity for 120 days were below $0.5^{\circ}C$ and 90%, respectively. Physiological and biochemical features of cabbage quality were also analyzed: weight loss, texture, and sugar salinity, chlorophyll, reducing sugar, and vitamin C contents. Results: The cooler with a remote monitoring and control interface could be operated by an HMI program. A $0.5^{\circ}C$ temperature and 90% humidity could be remotely controlled within the cooler for 120 days. Postharvest freshness of Chinese cabbages could be maintained up to 120 days depending on the packaging method and operation of the remote monitoring system. In particular, wrapping the cabbages in PEF with perforations resulted in a less than a 5% deterioration in quality. This study provides evidence for efficient performance of plastic films in minimizing post-harvest deterioration and maintaining overall quality of cabbages stored under precise low-temperature conditions with remote monitoring and a control interface. Conclusions: Packaging with a modified plastic film and storage in a precisely controlled cooler with a remote monitoring and control interface could slow down the physiological factors that cause adverse quality changes and thereby increase the shelf life of Chinese cabbage.

• 한국농업기계학회:학술대회논문집
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• 한국농업기계학회 2017년도 춘계공동학술대회
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• pp.122-122
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• 2017

Recently, environmental problems have become an area of growing interests. In-situ monitoring of water quality is fundamental to most environmental applications. The accurate measurement of nitrate concentrations is fundamental to understanding biogeochemistry in aquatic ecosystems. Several studies have reported that one of the most feasible methods to measure nitrate concentration is the use of Ion Selective-electrodes (ISEs). The ISE application to water monitoring has several advantages, such as direct measurement methodology, high sensitivity, wide measurement range, low cost, and portability. However, the ISE methods may yield inconsistent results where there was a difference in temperature between the calibration and measurement solutions, which is associated with the temperature dependence of ionic activity coefficients in solution. In this study, to investigate the potential of using the combination of a temperature sensor and nitrate ISEs for minimizing the effect of temperature on real-time nitrate sensing in natural water, a prototype of on-site water monitoring system was built, mainly consisting of a sensor chamber, an array of 3 ISEs, an waterproof temperature sensor, an automatic sampling system, and an arduino MCU board. The analog signals of ISEs were obtained using the second-order Sallen-key filter for performing voltage following, differential amplification, and low pass filtering. The performance test of the developed water nitrate sensing system was conducted in a monitoring station of drinking water located in Jeongseon, Kangwon. A temperature compensation method based on two-point normalization was proposed, which incorporated the determination of temperature coefficient values using regression equations relating solution temperature and electrode signal determined in our previous studies.

• Journal of Ecology and Environment
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• 제38권1호
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• pp.113-118
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• 2015

Conservation drones are remote-controlled devices capable of collecting information from difficult-to-access places while minimizing disturbance. Although drones are increasingly used in many research disciplines, their application to wildlife research remains to be explored in depth. This paper reports on the use of Phantom 2 Vision+ for monitoring areas in two national parks in South Korea. The first research area was conducted in Chiaksan National Park, and the second in Taeanhaean National Park. The aim of this research is to introduce ecologists and researchers alike to conservation drones and to show how these new tools have are fundamentally helping in the development of natural sciences. We also obtained photographs and videos of monitoring areas within our test site.

• 농업생명과학연구
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• 제46권6호
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• pp.185-195
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• 2012

The purpose of this paper is to analyze how strategically the bilaterally monopolistic firms, only-one-seller and only-one-buyer, behave in a situation in which each firm has uncertain information on its opponent firm's cost. Even though the two firms know that seeking integrated profit leads to the optimized profit for both firms, each firm has an incentive to opportunistically behave to increase its share of the integrated profit. These opportunistic behaviors of the firms are analyzed through a game theoretic approach especially finding Nash equilibrium mixed strategies for the strategic profiles such as true-report or not and monitoring or not. The comparative statics to the Nash equilibrium mixed strategies shows that as the profit share increases the probability of monitoring an opponent firm is decreased while the probability increases as the size of the overstated production cost increases. This study also shows that high penalty and low monitoring cost lead to high probability to tell the truth of the production cost.

• 한국지하수토양환경학회:학술대회논문집
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• 한국지하수토양환경학회 2005년도 INTERNATIONAL SYMPOSIUM ON SOIL & GROUNDWATER ENVIRONMENT
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• pp.222-223
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• 2005

• Journal of Biosystems Engineering
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• 제41권4호
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• pp.396-407
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• 2016

Background: Although hyperspectral imaging was originally introduced for military, remote sensing, and astrophysics applications, the use of analytical hyperspectral imaging techniques has been expanded to include monitoring of agricultural crops and commodities due to the broad range and highly specific and sensitive spectral information that can be acquired. Combining hyperspectral imaging with remote sensing expands the range of targets that can be analyzed. Results: Hyperspectral imaging technology can rapidly provide data suitable for monitoring a wide range of plant conditions such as plant stress, nitrogen status, infections, maturity index, and weed discrimination very rapidly, and its use in remote sensing allows for fast spatial coverage. Conclusions: This paper reviews current research on and potential applications of hyperspectral imaging and remote sensing for outdoor field monitoring of agricultural crops. The instrumentation and the fundamental concepts and approaches of hyperspectral imaging and remote sensing for agriculture are presented, along with more recent developments in agricultural monitoring applications. Also discussed are the challenges and limitations of outdoor applications of hyperspectral imaging technology such as illumination conditions and variations due to leaf and plant orientation.

• 한국환경농학회지
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• 제35권3호
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• pp.166-174
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• 2016

농경지 토양에서 대상항생제 6종(amoxicillin, ampicillin, chlortetracycline, enrofloxacin, oxytetracycline, tetracycline을 아세트산 함유 아세토니트릴, Na₂Cit.5H₂O, Na₃Cit.2H₂O과 Na₂-EDTA로 추출 후 C₁₈으로 정제하여 LC-MS/MS로 분석하는 모니터링을 수행하였다. 그 중 2종의 항생제, chlortetracycline과 enrofloxacin이 국내 농경지 토양에서 검출되었다. 제안한 분석법은 토양 중 잔류 항생제 모니터링을 위한 빠르고 간편한 시험법이었고 다양한 활용이 가능할 것으로 보인다.

• 지구물리와물리탐사
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• 제9권2호
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• pp.155-162
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• 2006

저수지 제체의 누수는 주로 세굴현상에 기인하며, 이 세굴현상은 주변의 토괴를 침식하여 결과적으로 제체의 파괴를 유발시키는 주된 요인이다. 따라서 누수구간의 탐지는 효과적인 제체의 유지관리에 필수적인 요소가 된다. 전기비저항 탐사는 저수지 제체의 안전진단에 가장 널리 사용되고 있는 물리탐사 방법으로 특히 세굴현상에 의한 누수구간의 탐지에 효과적인 것으로 알려져 있다. 하지만 기존의 전기비저항 탐사는 제체 마루에서 수행된 2차원 전기비저항 탐사자료의 역산 단면상에서 저비항대를 누수 위험 구간으로 해석하는 정성적인 단계에 머무르고 있다. 근자에 이르러 상시관측을 통한 전기비저항의 변화율을 이용한 해석방법이 제시되었지만 아직까지 제체의 안전도를 정량적으로 산출하는 기법에 관한 연구는 없는 실정이다. 제체내의 세굴현상이 진행됨에 따라 누수구간은 공극율이 증가하고, 공극율의 증가는 제체의 안전과 직결된다. 본 연구에서는 Archie의 경험식을 근거로 전기비저항 탐사에서 얻어진 건기전도도 자료를 제체부의 공극율로 변환하는 기법을 개발하였다. 또한 전기비저항 상시관측 자료를 이용하여 제체의 안전도 지수를 산출하는 방법론을 제시하고자 하였다.

• Journal of Microbiology and Biotechnology
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• 제20권1호
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• pp.193-201
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• 2010

A specific and rapid real-time PCR assay for detecting Ralstonia solanacearum in horticultural soil and plant tissues was developed in this study. The specific primers RSF/RSR were designed based on the upstream region of the UDP-3-O-acyl-GlcNAc deacetylase gene from R. solanacearum, and a PCR product of 159 bp was amplified specifically from 28 strains of R. solanacearum, which represent all genetically diverse AluI types and all 6 biovars, but not from any other nontarget species. The detection limit of $10^2\;CFU/g$ tomato stem and horticultural soil was achieved in this real-time PCR assay. The high sensitivity and specificity observed with field samples as well as with artificially infected samples suggested that this method might be a useful tool for detection and quantification of R. solanacearum in precise forecast and diagnosis.