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Flora, life form characteristics, and plan for the promotion of biodiversity in South Korea＇s Globally Important Agricultural Heritage System, the traditional Gudeuljang irrigated rice terraces in Cheongsando

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Journal of Mountain Science 2017年第6期14卷 1212-1228页

作者： Hong Chul PARK Chaang Hveon oh Korea National Park Research Institute Korea National Park Service Wonju-si Gangwon-do 26441 Korea Department of Biological and Environmental Science Dongguk University Goyang-si Ggeonggi-do 10326 Korea

The objectives of this study were to analyze the biodiversity of the Traditional Gudeuljang Irrigated Rice Terraces in Cheongsando, South Korea's representative GIAHS(Globally Important Agricultural Heritage System) site, with reference to position and land-use features, and to develop a plan to promote agricultural biodiversity in the region. We confirmed approximately 54,000 m2 of Gudeuljang paddy fields by an on-site survey. Of the Traditional Gudeuljang Irrigated Rice Terraces confirmed by onsite inspection, our survey showed that approximately 24,000 m2 are currently being used as paddy fields, approximately 15,000 m2 are being used as dry fields, and approximately 14,000 m2 are fallow. In terms of other non-agricultural land use, there was grassland, including graveyards; artificial arboreal land, such as orchards, rivers and wetlands, and man-made facilities, such as roads and residences. We also confirmed that the Traditional Gudeuljang Irrigated Rice Terraces had higher plant species diversity than conventional terraced rice paddies, and there was a difference in life form characteristics between the two types. Although the superficial topsoil structure is thesame for the Traditional Gudeuljang Irrigated Rice Terraces(TGIRTs) and conventional terraced rice paddies, it is thought that the differences in the subsurface structure of the TGIRTs contribute greatly to species and habitat diversity. However, the TGIRTs in Cheongsando are facing degeneration, due to damage and reduction in agricultural activity. The main cause is the reduction in the number of farming households due to an aging population in Cheongsando. In order to address this problem, we proposed a management plan, related to fallow paddy fields in South Korea, to initiate voluntary activities in the TGIRTs.

关键词： Globally Important Agricultural Heritage System Rice terrace Agricultural biodiversity Topsoil structure Gudeuljang

Pathophysiology and treatment of Barrett's esophagus

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World Journal of Gastroenterology 2010年第30期16卷 3762-3772页

作者： Daniel S oh Steven R DeMeester Department of Surgery The University of Southern CaliforniaKeck School of MedicineLos AngelesCA 90033United States

Gastroesophageal reflux disease (GERD) affects an estimated 20% of the population in the United States. About 10%-15% of patients with GERD develop Barrett’s esophagus, which can progress to adenocarcinoma, currently the most prevalent type of esophageal cancer. The esophagus is normally lined by squamous mucosa, therefore, it is clear that for adenocarcinoma to develop, there must be a sequence of events that result in transformation of the normal squamous mucosa into columnar epithelium. This sequence begins with gastroesophageal reflux, and with continued injury metaplastic columnar epithelium develops. This article reviews the pathophysiology of Barrett’s esophagus and implications for its treatment. The effect of medical and surgical therapy of Barrett’s esophagus is compared.

关键词： Gastroesophageal reflux disease Barrett’s esophagus Lower esophageal sphincter Esophageal motility Proton pump inhibitors Antireflux surgery

Use of Local Region Maps on Convolutional LSTM for Single-Image HDR Reconstruction

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Computers, Materials & Continua 2022年第6期71卷 4555-4572页

作者： Seungwook oh GyeongIk Shin Hyunki Hong College of Software Chung-Ang UniversityHeukseok-ro 84Dongjak-kuSeoul06973Korea

Low dynamic range(LDR)images captured by consumer cameras have a limited luminance *** the conventional method for generating high dynamic range(HDR)images involves merging multiple-exposure LDR images of the same scene(assuming a stationary scene),we introduce a learning-based model for single-image HDR *** input LDR image is sequentially segmented into the local region maps based on the cumulative histogram of the input brightness *** the local region maps,SParam-Net estimates the parameters of an inverse tone mapping function to generate a pseudo-HDR *** process the segmented region maps as the input sequences on long short-term ***,a fast super-resolution convolutional neural network is used for HDR image *** proposed method was trained and tested on datasets including HDR-Real,LDR-HDR-pair,and *** experimental results revealed that HDR images can be generated more reliably than using contemporary end-to-end approaches.

关键词： Low dynamic range high dynamic range deep learning convolutional long short-term memory inverse tone mapping function

Development of a cloud condensation nuclei(CCN)counter using a laser and charge-coupled device(CCD)camera

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Frontiers of Environmental Science & Engineering 2011年第3期5卷 313-319页

作者： Mikyung PARK Jinkwan oh Kihong PARK School of Environmental Science and Engineering Gwangju Institute of Science and TechnologyGwangju 500-712The Republic of Korea

A continuous flow streamwise thermal gradientcloud condensation nuclei(CCN)counter with anaerosol focusing and a laser-charge-coupled device(CCD)camera detector system was developed *** countingperformance of the laser-CCD camera detector system wasevaluated by comparing its measured number concentrationswith those measured with a condensation particlecounter(CPC)using polystyrene latex(PSL)and NaClparticles of varying *** CCD camera parameters(***,gain,gamma,and exposure time)wereoptimized to detect moving particles in the sensing volumeand to provide the best image to count *** CCNcounter worked well in the particle number concentrationrange of 0.6-8000#·cm^(-3)and the minimum detectablesize was found to be 0.5μ*** supersaturation in theCCN counter with varying temperature difference wasdetermined by using size-selected sodium chloride particlesbased on Köhler *** developed CCNcounter was applied to investigate CCN activity ofatmospheric ultrafine particles at 0.5%*** showed that CCN activity increased with increasingparticle size and that the higher CCN activation forultrafine particles occurred in the afternoon,suggesting thesignificant existence of hygroscopic or soluble species inphotochemically-produced ultrafine particles.

关键词： aerosol cloud condensation nuclei(CCN)counter ultrafine particle

Potential effects of future adoption of the REDD mechanism as a preventive measure against deforestation and forest degradation in North Korea

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Journal of Mountain Science 2016年第9期13卷 1645-1651页

作者： Hong Chul PARK Choong Hyeon oh Korea National Park Research Institute Korea National Park Service Department of Biological and Environmental Science Dongguk University

This study assesses potential effects of adaption to climate change in the future as a carbon related value using a baseline and credit approach, considering the implementation of the Reducing Emissions from Deforestation and forest Degradation （REDD） mechanism. Basic data were obtained for implementing the REDD mechanism in the Democratic People＇s Republic of Korea （DPRK） for scientific decision-making to prevent deforestation and forest degradation. The potential effects according to the implementation of the REDD mechanism in the DPRK based on forest status data （the latest） are as follows. If the deforestation rate is reduced to a level below 6% through a 20-year REDD mechanism beginning in 2011, 0.01-11.64 C-tons of carbon credit per ha could be issued for DPRK. Converted into C02-tons per ha, this amounts to 0.03-42.68 C02-tons, which translates to a minimum of 226,000 CO2-tons and a maximum of 289,082,000 C02-tons overall for forests in DPRK. In terms of carbon price, this measures up to 1.1o million USD- 1.4 billion USD, considering that the REDD carbon price in voluntary carbon markets in 2010 was around 5 USD.

关键词： Climate change Global warming Baseline approach Carbon Credit

Integral domains with finitely many spectral semistar operations

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Frontiers of Mathematics in China 2017年第1期12卷 35-49页

作者： Gyu Whan CHANG Dong Yeol oh Department of Mathematics Education Incheon National University Incheon 22012 Republic of Korea Department of Mathematics Education Chosun University Gwangju 61452Republic of Korea

Let D be a finite-dimensional integral domain, Spec（D） be the set of prime ideals of D, and SpSS（D） be the set of spectral semistar operations on D. Mimouni gave a complete description for the prime ideal structure of D with ｜SpSS（D）｜ = n ＋ dim（D） for 1 ≤ n ≤5 except for the quasi-local cases of n = 4, 5. In this paper, we show that there is an integral domain D such that ｜SpSS（D）｜ = n＋dim（D） for all positive integers n with n ≠ 2. As corollaries, we completely characterize the quasi-local domains D with ｜SpSS（D）｜= n＋dim（D） for n = 4, 5. Furthermore, we also present the lower and upper bounds of ISpSS（D）I when Spee（D） is a finite tree.

关键词： (Spectral) semistar operation prime spectrum (Krull) dimension

Dielectric Barrier Discharge Plasma-Induced Photocatalysis and Ozonation for the Treatment of Wastewater

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Plasma Science and Technology 2008年第1期10卷 100-105页

作者： MOK YoungSun JO Jin-oh LEE Heon-Ju Department of Chemical Engineering Cheju National University Jeju 690-756 South Korea Department of Energy Engineering Cheju National University Jeju 690-756 South Korea

The physicochemical processes of dielectric barrier discharge （DBD） such as insitu formation of chemically active species and emission of ultraviolet （UV）/visible light were utilized for the treatment of a simulated wastewater formed with Acid Red 4 as the model organic contaminant. The chemically active species （mostly ozone） produced in the DBD reactor were well distributed in the wastewater using a porous gas diffuser, thereby increasing the gas-liquid contact area. For the purpose of making the best use of the light emission, a titanium oxide-based photocatalyst was incorporated in the wastewater treating system. The experimental parameters chosen were the voltage applied to the DBD reactor, the initial pH of the wastewater, and the concentration of hydrogen peroxide added to the wastewater. The results have clearly shown that the present system capable of degrading organic contaminants in two ways （photocatalysis and ozonation） may be a promising wastewater treatment technology.

关键词： dielectric barrier discharge ozone ultraviolet light photocatalyst wastewater

Salinity intrusion characteristics analysis using EFDC model in the downstream of Geum River

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Journal of Environmental Sciences 2010年第6期22卷 934-939页

作者： Sangman Jeong Kyusung Yeon Youngteck Hur Kukryul oh Department of Civil and Environmental Engineering Kongju National University Water Resource Operation Center

As social interest in the environmental conservation and ecological restoration has recently increased, more research works have been done to resolve problems concerning environmental management of estuaries. In this study, a three-dimensional numerical model, Environmental Fluid Dynamics Code （EFDC） was used in the analysis of the salinity intrusion characteristics in the downstream of Geum River. The numerical simulation was performed to investigate the influence range for salinity intrusion when the gates were fully opened. The conditions used for simulation were the four flow regimes in Geum River Basin, Korea. Results indicated that the ranges of salinity intrusion from the barrage were 50.72 km （drought flow）, 48.87 km （low flow）, 46.56 km （normal flow） and 42.10 km （flood flow）. These results indicated that the EFDC model used for numerical simulation has high accuracy. The result concluded in this study can be used as a basis in understanding the extent of salinity intrusion effects at different flow rates.

关键词： Environmental Fluid Dynamics Code salinity intrusion barrage

Poisson double extensions

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Science China Mathematics 2020年第4期63卷 701-720页

作者： Qi Lou Sei-Qwon oh Shengqiang Wang School of Mathematical Sciences Fudan UniversityShanghai 200433China Department of Mathematics Chungnam National UniversityDaejeon 34134Republic of Korea Department of Mathematics East China University of Science and TechnologyShanghai 200237China

A double Ore extension was introduced by Zhang and Zhang(2008)to study a class of ArtinShelter regular *** we give a definition of Poisson double extension which may be considered as an analogue of the double Ore extension,and show that algebras in a class of double Ore extensions are deformation quantizations of Poisson double *** also investigate the modular derivations of Poisson double extensions and the relationship between Poisson double extensions and iterated Poisson polynomial *** are illustrated by examples.

关键词： Poisson double extension semiclassical limit deformation quantization