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Performance evaluation and calibration of capacitance sensor for estimating the salinity of reclaimed land

International Journal of Agricultural and Biological Engineering 2020年第1期13卷 206-210页

作者： Donggeun kim Younghwan Son Jaesung Park taejin kim Jihun Jeon Department of Rural Systems Engineering Seoul National UniversitySeoul 08826Republic of Korea Department of Rural Systems Engineering and Research Institute for Agriculture and Life SciencesSeoul National UniversitySeoul 08826Republic of Korea Department of Bioresource Engineering McGill UniversitySte-Anne-de-Bellevue QC H9X 3V9Canada

Generally,soil moisture and salinity in reclaimed land are monitored using soil dielectric sensors such as time domain reflectometry,frequency domain reflectometry,and *** soil dielectric sensor measures apparent dielectric ***,apparent dielectric permittivity is affected by soil moisture,salinity,and *** this study,performance evaluation and calibration of a dielectric sensor(5TE;METER Group,Inc.,Pullman,WA,USA)for monitoring soil salinity were *** calibration tests were completed,incorporating various levels of dry density,water content,and *** soil salinity was determined by the electrical conductivity(EC)1:5 *** volumetric water content as measured by the sensor was affected by dry density and water ***,it linearly increased as dry density and water content ***,when dry density or water content was high,the measured value of the sensor increased *** bulk EC measured by sensor had no specific correlation with EC 1:*** EC 1:5 measurement had a linear relationship with the gradient ofθandθ***,it can be estimated with a simple linear equation usingθfrom the soil test andθs from the capacitance *** R 2 value of the EC 1:5 estimation equation was *** proposed equation requiresθfrom the gravimetric sample andθs from the ***,in the case of monitoring salinity using a sensor,it is recommended to measure the water content with a tensiometer.

关键词： salinity capacitance sensor volumetric water content reclaimed land soil saline soil

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New Precoded Spatial-Multiplexing for an Erasure Event in Single Frequency Networks

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China Communications 2018年第4期15卷 130-140页

作者： hojun kim seyoung kim yulong shang seunghyeon kim taejin jung Department of Electronics and Computer Engineering Chonnam National University Gwangju 61186 Republic of Korea R＆D Planning and Management Team Giga KOREA Foundation Daejcon 34054 Republic of Korea

In this paper, we propose a new spatial-multiplexing(SM) scheme employing an orthogonal precoder over Rayleigh-fading channels for an erasure event in single frequency networks(SFN). To optimize the precoder, the average bit error rate(BER) is evaluated and minimized through a mathematical analysis. Compared to an ordinary SM, the proposed scheme guarantees identical BER performance under non-erasure fading channels and achieves a greatly improved performance under erasure fading channels, especially for a higher erasure-ratio and SNR values. This improvement is mainly due to the increase in the diversity gain incurred by the optimized precoder over the erasure event. We also compare the performance of the proposed SM to that of the conventional constellation-rotation(CR) scheme applied to the single antenna SFN systems. The results of a computer simulation show that the performance of the new scheme is more effective than that of a conventional CR across all simulation cases.

关键词： Spatial-multiplexing single fre-quency network Rayleigh fading constella-tion-rotation broadcasting systems.

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Investigation of drying characteristics of low rank coal of bubbling fluidization through experiment using lab scale

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Science China(Technological Sciences) 2011年第7期54卷 1680-1683页

作者： DoMan JEON taejin KANG HyungTaek kim SiHyun LEE SangDo kim Division of Energy Systems Research Ajou University Korea Institute of Energy Research DaeJeon Republic of Korea

Lignite is a low rank coal which is evenly distributed throughout the world and accounts for 45% of the total coal reserves. As it has a higher moisture content, its moisture content must be reduced in order to utilize it in power plant. In the present work, experiments on lignite has been done using a lab scale fluidized-bed reactor. Drying lignite through fluidized-bed reactor has a higher drying rate because there is good contact between particles and gas in the fluidized-bed reactor. Fluidized-bed drying can use air of 1.5 times of the minimum fluidizing velocity performance at bubbling fluidized-bed. Experiments have been performed on coal particle sizes of 0.3-1 mm, 1-1.18 mm and 1.18-2.8 mm, with operating temperatures being 100℃, 125℃ and 150℃, respectively. It is found that fluidization has a higher drying rate due to the heat transfer rate through air velocity. Hence, moisture content in lignite can be dried to a desired value with a time interval of 10 rain. The experiment through fluidized-bed reactor is expected to be useful for saving money and time.

关键词： low rank coal moisture content minimum fluidizing velocity bubbling fluidized-bed

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Efficient Explanation and Evaluation Methodology Based on Hybrid Feature Dropout

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Computer Systems Science & Engineering 2023年第10期47卷 471-490页

作者： Jingang kim Suengbum Lim taejin Lee Department of Information Security Hoseo UniversityAsan31499Korea

AI-related research is conducted in various ways,but the reliability of AI prediction results is currently insufficient,so expert decisions are indispensable for tasks that require essential ***(eXplainable AI)is studied to improve the reliability of ***,each XAI methodology shows different results in the same data set and exact *** means that XAI results must be given meaning,and a lot of noise value *** paper proposes the HFD(Hybrid Feature Dropout)-based XAI and evaluation *** proposed XAI methodology can mitigate shortcomings,such as incorrect feature weights and impractical feature *** are few XAI evaluation *** paper proposed four evaluation criteria that can give practical *** a result of verifying with the malware data set(Data Challenge 2019),we confirmed better results than other XAI methodologies in 4 evaluation *** the efficiency of interpretation is verified with a reasonable XAI evaluation standard,The practicality of the XAI methodology will be *** addition,The usefulness of the XAI methodology will be demonstrated to enhance the reliability of AI,and it helps apply AI results to essential tasks that require expert decision-making.

关键词： Explainable artificial intelligence evaluation hybrid feature dropout deep learning error detection

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Radial growth response of Pinus densiflora and Quercus *** topographic and climatic factors in South Korea

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Journal of Plant Ecology 2013年第5期6卷 380-392页

作者： Jae Gyun Byun Woo Kyun Lee Moonil kim Doo Ahn Kwak Hanbin Kwak taejin Park Woo Hyuk Byun Yowhan Son Jung Kee Choi Young Jin Lee Joachim Saborowski Dong Jun Chung Jin Hyun Jung Institute for Environmental Research(Biology V) RWTH Aachen UniversityWorringerweg 152074 AachenGermany Division of Environmental Science and Ecological Engineering Korea UniversitySeoul136-701Korea GIS/RS Center for Environmental Resources Korea UniversitySeoul 136-173Korea Department of Forest Management Kangwon National UniversityChunchon 200-701Korea Department of Forest Resources Kongju National UniversityKongju 341-701Korea Institute of Forest Biometry and Informatics Georg-August-University Gottingen37077 GottingenGermany National Forestry Cooperative Federation Daejeon 306-808Korea

Aims This study aimed to develop radial growth models and to predict the potential spatial distribution of Pinus densiflora(Japanese red pine)and Quercus spp.(Oaks)in South Korea,considering topographic and climatic *** We used a dataset of diameter at breast height and radial growth estimates of individual trees,topographic and climatic factors in systematic sample plots distributed over the whole of South *** the basis that radial growth is attributed primarily to tree age,we developed a radial growth model employing tree age as an explanatory *** estimated standard growth(SG),defined as radial growth of the tree at age 30,to eliminate the influence of tree age on radial *** addition,SG estimates including the Topographic Wetness Index,temperature and precipitation were calculated by the Generalized Additive *** Findings As a result of variogram analysis of SG,we found spatial autocorrelation between SG,topographic and climatic *** temperature had negative impacts on radial growth of *** and positive impacts on that of Quercus *** was associated with positive effects on both tree *** on the model,we found that radial growth of *** would be more vulnerable than that of Quercus *** climatic *** simulation with the radial growth model,it was predicted that *** stands would be gradually replaced with Quercus *** in eastern coastal and southern regions of South Korea in the *** models developed in this study will be helpful for understanding the impact of climatic factors on tree growth and for predicting changes in distribution of *** and Quercus *** to climate change in South Korea.

关键词： standard radial growth general additive model climatic factors climate change forest-cover change

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