http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Case Analysis and Future Directions for High-Quality Smart Citrus Farming in Jeju Island
Jin-Hyuck Jeong,Ka Young Lee,Samsuzzaman,ALI MOHAMMOD,Sun-Ok Chung,Soon Jung Hong 사단법인 한국정밀농업학회 2023 정밀농업과학기술지 Vol.5 No.2
High-quality citrus farming is essential for increasing agricultural production on Jeju Island.Citrus income, which accounts for 56% of the total, has a significant influence on the Jeju economy. However, improving citrus quality has become one of Jeju's most critical agricultural concerns year after year. Although the climate and terrain of Jeju Island are not suitable for agriculture, it has a relatively favorable environment for citrus production. Various smart agriculture initiatives have been introduced to enhance the quality of citrus, but due to cost constraints and a lack of public awareness, they have not been widely adopted. As a result, efforts are still being made to raise public awareness of smart farm technology, develop human resources, and advance the technology. This study provides four key technologies for the production of high-sugar citrus: soil cover cultivation technology, mature tree transplanting and field-based maintenance, non-destructive sugar content monitoring and systematization, and the application of smart farm technology. The major impact of this farming approach is to manage sugar costs and improve fruit color and quality, which is the basis for increasing farmers earnings through the production of high-quality citrus. This article also highlights two leading farmers who are applying these techniques to produce highquality citrus on their fields. The utility of the technology is analyzed, and future development directions for effective citrus farming are identified through case studies. This research proposed a Jeju-type smart farm system that integrates open fields and greenhouses, using innovative technologies and data-based convergence to enhance high-quality citrus cultivation.
Characteristics of Pc5 activity at high latitudes stations in Antarctica
Kwon, Hyuck-Jin,Kim, Khan-Hyuk,Jee, Geonhwa,Jin, Ho,Kim, Hyomin,Shin, Jehyuck,Lee, Seungah,Kwon, Jong-Woo,Kim, Jeong-Han,Lee, Changsup,Lessard, Marc Elsevier 2019 Journal of Atmospheric and Solar-Terrestrial Physi Vol.193 No.-
<P><B>Abstract</B></P> <P>We examined wave activities in the Pc5 frequency band (~2–7 mHz) using the magnetic field data from five Antarctic stations, which are AGO3 (72.5° S Altitude-Adjusted Corrected Geomagnetic latitude), South Pole (SPA, 74.6° S), McMurdo (MCM) and Jang Bogo Station (JBS, 80° S), and Dome C (DMC, 89.1° S), during 2017. Pc5 waves at AGO3 and SPA show characteristics associated with Kelvin-Helmohltz instability on the magnetopause and substorm activities, under closed field lines conditions. The local time and seasonal dependence of Pc5 wave activities at polar cap stations (MCM, JBS, and DMC) are significantly different from those at AGO3 and SPA. These indicate that the generation mechanism of Pc5 activities in the open field line region at polar cap is different from that in the closed field lines. We suggest that polar-cap Pc5 is generated by ionospheric current variations produced by solar dynamo between solar wind plasma and geomagnetic field.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Pc5 pulsations observed at high latitude ground stations located in Antarctica in 2017. </LI> <LI> Latitudinal dependence of diurnal seasonal variations of Pc5 activities. </LI> <LI> The comparison of Pc5 and solar wind speed. </LI> <LI> Difference generation mechanism of Pc5 waves at auroral latitudes and polar-cap region. </LI> </UL> </P>
화력발전소 유래 바이오차(WPC)의 토양 내 납 안정화 효과
윤혁진(Hyuck-Jin Yoon),박병준(Byung-Jun Park),이찬규(Chan-Gyu Lee),정석순(Seok-Soon Jeong),김연호(Yeon-Ho Kim),남성현(Sung-Hyeon Nam),김혁수(Hyuck-Soo Kim) 한국토양비료학회 2021 한국토양비료학회 학술발표회 초록집 Vol.2021 No.11
바이오차는 많은 공극과 넓은 표면적을 가지며, pH가 높은 특성을 띄는 물질로 그동안 다양한 바이오차를 이용해 토양 중금속 안정화 연구가 진행되었다. 하지만 바이오차 생산에는 많은 에너지가 요구되기 때문에 상용화에 어려움이 있었다. 최근 화력발전소에서 목재펠릿 연소 후 대량으로 바이오차가 (Wood Pellet Biochar; WPC)가 발생하고 있으며, 본 연구는 이들 바이오차를 이용한 토양 중 납(Pb) 안정화 효율을 평가하고자 수행하였다. 본 연구에서는 WPC를 납 오염토양에 각각 1, 3, 5 %(w/w)의 비율로 처리하여 상추 재배 실험을 진행하였으며, 납 안정화 효율을 비교하고자 왕겨 바이오차(Rice Hull Biochar; RHC)를 동일한 비율로 처리하였다. 상추는 25±1℃로 유지되는 생장상에서 30일간 재배하였으며, 재배 후 토양은 1M NH₄NO₃로 추출하여 ICP-OES를 이용해 식물 유효태 Pb 함량을 분석하였다. 상추는 질산으로 분해한 후 Pb 함량을 측정하였다. 상추 재배 후 토양의 식물 유효태 Pb 함량은 무처리구(CON) 대비 WPC 5% 처리구 토양에서 85% 감소하는 것으로 나타났으며(Fig.1), 이는 바이오차 처리에 의한 토양 pH 상승과 유의한 관계가 있는 것으로 나타났다. 바이오차 처리에 의한 토양 중 식물유효태 Pb 함량 감소는 상추의 Pb 함량에 직접적인 영향을 미쳤다. 무처리구 토양에서 재배한 상추의 Pb 함량은 63.5 mg kg<SUP>-1</SUP>으로 WPC의 처리량에 따라 60.9%까지 유의하게 감소하는 경향을 보였으며, RHC 처리 토양에서는 최대 31.3% 감소하여 WPC의 중금속 안정화 효과가 더 큰 것으로 나타났다. 결과적으로 화력발전소에서 대량 발생하는 바이오차는 농경지 중금속 오염 토양에 효율적으로 활용될 수 있을 것으로 판단된다. 〈수식 본문참조〉
위식도 역류질환 환자에서 Proton Pump Inhibitor 치료 후 재발률 및 증상개선에 관한 임상적 고찰
정유정 ( You Jeong Jeong ),이동호 ( Dong Ho Lee ),최태혁 ( Tae Hyuck Choi ),황태준 ( Tae Jun Hwang ),이병환 ( Byeong Hwan Lee ),나종천 ( Jong Chon Nah ),이상협 ( Sang Hyub Lee ),박영수 ( Young Soo Park ),황진혁 ( Jin Hyok Hwang 대한소화기학회 2010 대한소화기학회지 Vol.55 No.2
목적: 위 식도 역류질환은 치료 후 증상 호전 및 식도염이 치유되더라도 약 복용을 중단하면 1년 이내에 50-80%에서 재발하는 만성적인 경과를 갖는 것으로 알려져 있다. 이에 저자들은 위 식도 역류질환 환자들에서 양자펌프 억제제 투여 후 재발률과 치료에 대한 반응을 비교하였다. 대상 및 방법: 2008년 7월부터 2009년 1월까지 분당서울대학교병원 소화기내과 외래를 방문했던 식도염 증상을 호소하는 총 207명의 역류성 식도염 환자에서 위 내시경 검사를 시행 후 비미란성 역류성 식도염과 미란성 역류성 식도염 두 군으로 나누었고 비미란성 식도염군은 란소프라졸 15 mg, 미란성 식도염군은 란소프라졸 30mg을 각각 8주간 투여하였다. 상부위장관 내시경 검사 시 H. pylori 감염 여부를 확인하였으며 가슴 쓰림, 역류, 소화장애 및 비전형적인 증상의 4가지 증상항목을 치료 전과 8주간 치료 후에 조사하였다. 투약에 따른 치료반응이 있었던 환자들에서 전화 설문이나 외래 방문을 통하여 치료 중단 후 증상 재발에 대해 평가하였다. 결과:평균 추적 관찰 기간은 24.4주로 시험을 완료한 총 207명의 위 식도 역류질환 환자에서 전체 재발률은 40%였으며 NERD군 94명, ERD군 113명으로 나눈 두 군에서의 재발률은 각각 43.8%, 35.1%였고 두 군 간 차이는 없었다. 평균 재발 시기는 NERD군은 10.1주, ERD군은 10.6주였으며, 8주간 투약 후 증상 개선율은 전체 위 식도 역류질환 환자에서 89.4%였고 NERD군은 85.1%, ERD군은 92.9%로 재발시기와 증상 개선율 모두 두 군 간 차이를 보이지 않았다. 식도염의 4가지 증상에 대해 치료 전후 비교한 점수는 두 군 모두 유의한 감소가 있었으며(p< 0.001), H. pylori 감염률은 NERD군에 비해 ERD군에서 유의하게 낮은 결과를 나타내었다(34.3% vs. 20.0%, p=0.036). 결론: 위 식도 역류질환 환자에서 8주간 PPI 치료 후 6개월 이내 재발률은 40%였으며 절반용량을 투여한 비미란성 식도염군과 표준용량을 투여한 미란성 식도염군에서 재발률, 재발시기 및 증상 개선율은 두군 간 차이가 없었고, 역류성 식도염의 재발을 예방하기 위해 양자펌프 억제제의 필요 시 투여 혹은 지속적 투여를 고려해야 될 것으로 생각한다. Background/Aims: Gastro-esophageal reflux disease (GERD) is a chronic condition, with 50-80% of patients experiencing recurrence within one year following completion of initial treatment. The present study aimed to estimate recurrence rate and treatment response in GERD patients treated with proton pump inhibitor. Methods: A total of 207 symptomatic GERD patients, which were confirmed by endoscopy from July 2008 till January 2009, were enrolled. They were divided into non-erosive reflux disease (NERD) group and erosive reflux disease (ERD) group by endoscopic findings. Patients were treated with lansoprazole 15 mg (NERD group) or 30 mg (ERD group) once daily for 8 weeks. The presence of symptoms was assessed in each patient at baseline and post-treatment using a questionnaire. Subsequent symptomatic recurrence on the cessation of therapy in each improved patients was checked by telephone survey or outpatient interview. Results: Ninety-four patients and 113 patients were first diagnosed with NERD and ERD, respectively. The mean post-treatment follow-up period was 24.4±8.5 weeks. Recurrence rate was 40.0% (NERD, 43.8%; ERD, 37.1% (p=0.224)). Recurrence time was 10.1±5.8 weeks (NERD 9.6 weeks; ERD, 10.6 weeks (p=0.444)). Regarding the symptom improvement after 8 week therapy with lansoprazole, 89.4% (NERD, 85.1%; ERD, 92.9% (p=0.056)) of total patients were symptomatically improved. Conclusions: Forty percentage of GERD patients recurred within 6 months following the completion of 8 week therapy with lansoprazole. Recurrence rate, recurrence time, and rate of symptom improvement were not significantly different between NERD group treated with half dose and ERD group treated with full dose lansoprazole. (Korean J Gastroenterol 2010;55:100-108)
Pil Sang Song,Seok-Woo Seong,Ji-Yeon Kim,Soo Yeon An,Mi Joo Kim,Kye Taek Ahn,Seon-Ah Jin,Jin-Ok Jeong,Jeong Hoon Yang,Joo-Yong Hahn,Hyeon-Cheol Gwon,Woo Jin Jang,Hyuck Jun Yoon,Jang-Whan Bae,Woong Gil 대한심장학회 2024 Korean Circulation Journal Vol.54 No.4
Background and Objectives: Concerns remain that early aspirin cessation may be associated with potential harm in subsets at high risk of ischemic events. This study aimed to assess the effects of P2Y12 inhibitor monotherapy after 3-month dual antiplatelet therapy (DAPT) vs. prolonged DAPT (12-month or longer) based on the ischemic risk stratification, the CHADS-P2A2RC, after percutaneous coronary intervention (PCI). Methods: This was a sub-study of the SMART-CHOICE trial. The effect of the randomized antiplatelet strategies was assessed across 3 CHADS-P2A2RC risk score categories. The primary outcome was a major adverse cardiac and cerebral event (MACCE), a composite of all-cause death, myocardial infarction, or stroke. Results: Up to 3 years, the high CHADS-P2A2RC risk score group had the highest incidence of MACCE (105 [12.1%], adjusted hazard ratio [HR], 2.927; 95% confidence interval [CI], 1.358–6.309; p=0.006) followed by moderate-risk (40 [1.4%], adjusted HR, 1.786; 95% CI, 0.868–3.674; p=0.115) and low-risk (9 [0.5%], reference). In secondary analyses, P2Y12 inhibitor monotherapy reduced the Bleeding Academic Research Consortium (BARC) types 2, 3, or 5 bleeding without increasing the risk of MACCE as compared with prolonged DAPT across the 3 CHADS-P2A2RC risk strata without significant interaction term (interaction p for MACCE=0.705 and interaction p for BARC types 2, 3, or 5 bleeding=0.055). Conclusions: The CHADS-P2A2RC risk score is valuable in discriminating high-ischemic-risk patients. Even in such patients with a high risk of ischemic events, P2Y12 inhibitor monotherapy was associated with a lower incidence of bleeding without increased risk of ischemic events compared with prolonged DAPT.
Engineering Geological Characteristics of Freeze-Thaw Weathered Gneiss in the Wonju Area, Korea
( Jeong Gi Um ),( Ik Woo ),( Hyuck Jin Park ) 대한지질공학회 2014 지질공학 Vol.24 No.2
We present the results of an experimental physical weathering study that focuses on fresh and slightly weathered gneiss samples from the Wonju area of Korea. The study investigated changes in the physico-mechanical properties of these samples during accelerated laboratory-based weathering, including analyses of micro fracture formation. The deteriorated samples used in the study were subjected to 100-150 freeze-thaw cycles, with index properties and micro fracture geometries measured between each cycle. Each complete freeze-thaw cycle lasted 24hours, and consisted of 2 hours of saturation in a vacuum chamber, 8 hours of freezing at -21℃ ± 1℃, and 14hours of thawing at room temperature. Specific gravity and seismic velocity values were negatively correlated with the number of freeze-thaw cycles, whereas absorption values tended to increase. The amount of deterioration of the rock samples was dependent on the degree of weathering of the rock prior to the start of the analysis. Absorption, specific gravity, and seismic velocity values can be used to infer the amount of physical weathering experienced by a gneiss in the study area. The sizes and density of micro fracture in the rock specimens varied with the number of freeze-thaw cycles. We found that box fractal dimensions can be used to quantify the formation and propagation of micro fracture in the samples. In addition, these box fractal dimensions can be used as a weathering index for the mid- and long-term prediction of rock weathering. The present results indicate that accelerated-weathering analysis can provide a detailed overview of the weathering characteristics of deteriorated rocks.