림프질 전이가 있는 하인두암과 하부식도암의 진단에 활용된 내시경초음파 유도하 Trucut 생검 1예

광명옥,이정환,문정섭,김유선,류수형,총배천,김형훈,김현태 仁濟大學校 白病院 2010 仁濟醫學 Vol.31 No.-

The incidence of double primary cancer is about 10% in all kinds of cancers. Double primary cancer is usually accompanied by gastrointestinal cancer. Esophageal cancer is supposed to be frequently accompanied by squamous cell carcinoma of the head and neck or the upper respiratory tract, because of such common carcinogens as smoking and alcohol ingestion. Esophageal cancer and hypopharyngeal cancer are usually diagnosed by esophagogastric endoscopy with biopsy. We performed endoscopic ultrasound-guided Trucut biopsy(EUS-TCB) to diagnose a mediastinal mass in a 49 year-old patient, who visited our hospital because of voice change. During procedure, we accidently found enlarged celiac lymph node, and obtained tissue from the mediastinal lymph node and the celiac lymph node. We confirmed double primary cancer of squamous cell carcinoma in the esophagus and the hypopharynx via esophagogastric endoscopy.

유기농업에서의 작물의 양분관리

안난희, 신재훈, 옥정훈, 이상민, 김석철, 사동민 忠北大學校 農業科學硏究所 2016 農業科學硏究 Vol.32 No.2

Soil fertility is fundamental in determining the productivity of all farming systems and is most�ﾠ�ﾠ commonly defined in terms of the ability of the soil to supply nutrients to crops. Organic farming systems rely on the management of soil organic matter to enhance the chemical, biological and physical properties of the soil, in order to optimize crop production. Organic agriculture excludes the use of chemical nitrogen fertilizers, instead requiring a balance between supply and demand nutrients through the use of organic matter. Nutrient management is one of the main challenges facing organic farming. The short term challenge is supplying sufficient nutrients to crops at the correct point in their development to achieve economically viable yield, while in the long term, the difficulty is to balance nutrient inputs and runoffs to avoid nutrient rundown or environmental pollution. This paper reviews information from the literature to investigate strategies of managing nutrients by supplying organic matter in organic agriculture during the major phases of crop growth.

소형 라이시미터를 활용한 유기자재에 따른 유기농 논물에서의 무기태질소 동태

옥정훈 ( Jung-hun Ok ),신재훈 ( Jae-hoon Shin ),조정래 ( Jung-lai Cho ),안난희 ( Nan-hee An ),남홍식 ( Hong-shik Nam ),정지희 ( Ji-hee Jeong ),정정아 ( Jung-ah Jung ),김석철 ( Seok-chol Kim ) 한국환경농학회 2016 한국환경농학회 학술대회집 Vol.2016 No.-

Behavior of inorganic nitrogen in organic paddy field water depending on organic nutrient sources was monitored using mini-lysimeters. The mini-lysimeters were placed in National institute of Agricultural Sciences (NAS). 36 undisturbed paddy field soil samples of 30 × 80 cm (diameter × height) was collected by special sampler and installed in mini-lysimeters. After stabilization of lysimeters, several input treatments of organic nutrient sources were applied, including compost, expeller cake and green manures of hairy vetch and rye. Each nutrient source as recommended by the standard amount of fertilizer for rice was supplied 2 weeks before rice transplanting. The water level was maintained 10 cm water depth, and water samples were collected periodically. The pH, specific electrical conductance (EC), and inorganic nitrogen concentration in paddy water was monitored during the experimental period. The average pH value in paddy water was ranged from 7.1 to 7.7. The average EC value in paddy water were ranged from 0.25 to 0.97, and showed to appear higher tend rye > compost > hairy vetch > expeller cake > chemical fertilizers > control. The change of inorganic nitrogen concentration in paddy water is shown in figure 1. The inorganic nitrogen concentrations quickly reached their highest within 26 days after organic nutrient application and decreased afterwards. The inorganic nitrogen concentration for expeller cake and green manure treatments were higher as compared to that for compost and chemical fertilizers treatments. The increasing and decreasing of inorganic nitrogen concentration showed different trends according to the processing of organic nutrient sources.

신규 유기농경지에서 지속적인 퇴비 및 녹비 공급방법에 따른 토양의 비옥도 변화 모니터링

옥정훈 ( Jung-hun Ok ),안난희 ( Nan-hee An ),이병모 ( Byung-mo Lee ),조정래 ( Jung-lai Cho ),신재훈 ( Jae-hoon Shin ),공민재 ( Min-jae Kong ),정정아 ( Jung-ah Jung ) 한국농공학회 2014 한국농공학회 학술대회초록집 Vol.2014 No.-

Monitoring for soil fertility change according to continuous organic supply of organic compost and green manure in newly organic field was conducted in iseo-myeon, wanju-kun, Jeollabuk-do, Korea, where is relocated for Rural Development Administration. Due to the newly reclaimed field, this experiment site soil was very low fertility and low physico-chemical properties. Several organic supply way for organic agricultural practices were applied organic compost such as compost and green manure during 3 years. The other way for conventional agricultural practice was applied chemical fertilizer, and control without fertilizer. The pH, electric conductivity (EC), organic matter (OM), C/N ratio, available phosphate (Av.P₂O₅), and exchange cation in soil were monitored continuously during 3 years. Soil fertility in organic compost treatment was improved compare to chemical fertilizer treatment and control. The concentration in organic compost treatment was increased continually and closed to the recommended rate of soil fertilizer (Fig 1).

A calculation of the neutron endurance for Al2O3/SS316L

Jung Kwan hui,Jeon Ok Sung,Lee Hak Ji,Ha Joohwan,진영구,Yang Hyun Seo,Yoo Young Joon,Lee Se Hun,Hong Dongpyo,Kim Dong min,Park Byung-Gun,Park Sang Yoon,Lee Sang-hwa 한국물리학회 2022 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.80 No.5

The structural materials of a test blanket module were exposed to neutron irradiation and hydrogen isotope permeation. A quantification of neutron irradiation damage of these materials is important to estimate the point defect rate, which traps hydrogen isotope. To evaluate the structural stability of the hydrogen isotope permeation barrier for international thermonuclear experimental reactor materials, neutron irradiation damage of Al2O3/ SS316L is required. An MC-50 cyclotron was used as a source for neutron irradiation during the neutron dose experiments. Beryllium (Be) was used as a target for the neutron generation by 9Be(p,n)9B reaction, and the neutron spectrum was calculated. The resultant dominant relative neutron fluxes were similar, with neutron energies of 2.45 and 14.1 MeV, which are given by D–D and D–T reaction from a nuclear fusion reactor. To quantify the extent of damage due to the neutron irradiation, the displacement per atom rate was calculated using the particle and heavy ion transport code system. The effect of the thickness of the Al2O3 layer on the neutron irradiation damage and on its radionuclides was also analyzed. The information on the reaction rate and the radionuclides for charged particles can be combined with a density functional theory analysis to explain the correlation between hydrogen isotope permeability and defects.

Water Balance for Chinese Cabbage in Spring Season with Different Upland Soils Evaluated Using Weighable Lysimeters

Jung-hun Ok,Kyung-hwa Han,Ye-Jin Lee,Yong-seon Zhang,Hee-rae Cho,Seon-ah Hwang,Soon-sun Kim,Jin-hee Lee,Dong-Jin Kim 한국토양비료학회 2018 한국토양비료학회지 Vol.51 No.4

In this study, we evaluated the water balance for Chinese cabbage cultivation in spring season with different upland soils using weighable lysimeter, and investigated the evapotranspiration at different growth stage of Chinese cabbage and total inflows and outflows as affected by soil texture . Outflows such as percolation and evapotranspiration were different with soil type (i.e., soil texture), while no significant difference for total inflows. It was also shown that the least amount of drainage in the loam with high bulk density and the largest amount of drainage in silty clay loam. This is thought to be the result of the vertical movement of water through macropore along with the cracking of the soil that was created by repeated shrinkage and expansion of the silt clay loam during the winter season. The evapotranspiration during the Chinese cabbage cultivation period was the highest in loam, and this is probably due to the large leaf area of the Chinese cabbage grown in loam and high biomass weight. Based on the data obtained using the weighable lysimeter, water movement and water balance of the upland soil could be evaluated. Our study will contribute to the development of national factors in Korea for the estimation of the water management for upland crops with production and accumulation of several years data.

The Study of Improvement of Measurement Precision on Bulk Density, Soil Hardness and Air Permeability in Upland Soils

Ok, Jung-hun,Han, Kyung-hwa,Cho, Hee-rae,Zhang, Yong-seon,Seo, Young-ho,Jung, Kang-ho,Lee, Hyub-sung,Kim, Gi-sun 한국토양비료학회 2017 한국토양비료학회지 Vol.50 No.5

The measurement based on reliable standard operating procedures (SOPs) is important for consistent information. The objective of this study is to investigate reliable SOPs of soil physical methods, including core method for bulk density, Yamanaka hardness, and air permeameter method for air permeability. The coefficients of variation in bulk density (core method), Yamanaka hardness, and air permeability were ranged of 1~6%, 8~13%, and 10~84%, respectively. The variation in situ measurement such as bulk density, hardness, and air permeability due to spatial variability at measuring site was larger due to the number of replicates, organic matter content, and soil texture. Nevertheless, air permeability had different values as different number of replicates, and thus, it is thought that more replicates can result in higher reliability. It suggested that investigation of soil physical properties for the target sites should required to consider about soil texture, organic matter content, and number of replications before measurement. In conclusion, core sampling for bulk density measurement in upland soil recommended to perform in 3 repetitions with 2 inch core, and 3 inch core sampling for higher organic matter content.

Estimation of Upland Soil Loss and Canopy Cover Subfactor under Soybean Cultivation Using Slope Lysimeter

Jung-hun Ok,Jeong-woo Son,Seon-ah Hwang,Hyub-sung Lee,Bu-yeong Oh 한국토양비료학회 2021 한국토양비료학회지 Vol.54 No.4

This study was conducted to estimate the upland soil loss and canopy cover subfactor for revised universal soil loss equation (RUSLE) on different soil types using a slope lysimeter. The lysimeters were installed with 13% steepness, 25 m length, 2 m width under three different soil textures which were clay loam (CL), loam (L), and sandy loam (SL). The experiment was done for five months from 27-May to 29-October, 2020 and the soybean seedling was transplanted on 27-May and harvested on 29-October. Upland soil loss and runoff, soybean growth response, and meteorological data were monitored. Total eight times rainfall events recorded 710.5 mm precipitation, resulting in rainfall intensity (EI30) of 3,351.6 MJ mm ha<SUP>-1</SUP> hr<SUP>-1</SUP>. Total amounts of soil loss from uncultivated and soybean cultivated soils were 31.8 and 6.9 ton ha<SUP>-1</SUP> for CL, 32.3 and 16.8 ton ha<SUP>-1</SUP> for L lysimeter, 61.04 and 14.4 ton ha<SUP>-1</SUP> for SL, respectively. In addition, the canopy cover subfactor of RUSLE values for CL, L, and SL were 0.564, 0.507, and 0.371, respectively. The highest soil loss was measured at 18 days after soybean transplanting (DAT18), occupied 75% of total soil loss over whole experiment period.

Weighable Lysimeter Study for Water Balance Estimation of Chinese Cabbage in the Fall Season

Jung-hun Ok,Kyung-hwa Han,Yong-seon Zhang,Hee-rae Cho,Seon-ah Hwang,Dong-Jin Kim 한국토양비료학회 2019 한국토양비료학회지 Vol.52 No.4

In this study, we estimated and compared the water balance and total water requirement for Chinese cabbage cultivation in the fall season using weighable lysimeters. The water balance of input and output were investigated according to by two different upland soils. In Chinese cabbage cultivation, the total input was different in precipitation and irrigation, and total output was different in evapotranspiration and drainage. The estimated total water requirement for Chinese cabbage cultivation in the fall season in 2017 and 2018 were lower as compared to that in normal years (1981 - 2010) because of large amount rainfall around transplanting in 2017 and several rainfall events in 2018. The total water requirements for normal years, 2017, and 2018 were 147.2 mm, 143.6 mm, and 135.5 mm, respectively, compared to the normal years, it decreased by 2% in 2017 and by 8% in 2018. The weighable lysimeter has provided a useful tool for the water balance and water requirement estimation of Chinese cabbage and could be developed for several crops in upland condition based on obtained data.

Short Communication : Open Access ; Photodegradation of Butachlor and Pyrazosulfuron-ethyl in Rice Paddy Water under Natural Sunlight

( Jung Hun Ok ),( Hirozumi Watanabe ),( Jung Lai Cho ),( Nan Hee An ),( Byung Mo Lee ) 한국환경농학회 2014 한국환경농학회지 Vol.33 No.2

BACKGROUND: Dissipation of herbicides in paddy water varies significantly, being dependent on environmental conditions such as sunlight. The photodegradation under natural sunlight may be one of natural degradation routes of herbicides dissipation. Therefore, the aim of this study was to monitor the degradation of butachlor and pyrazosulfuron- ethyl in paddy water under natural sunlight. METHODS AND RESULTS: The 12 water sample bottles of treatment were covered by quart glass plates, which allow about 90% of UV radiation (280-2000 nm) to pass through, to minimize the UV attenuation. The other 12 water sample bottles of the control were covered by glass lids and wrapped with aluminum foils to prevent the sunlight. The concentration of butachlor and pyrazosulfuron- ethyl in paddy water samples bottles was monitored under ambient conditions with and without natural sunlight. The concentration of butachlor and pyrazosulfuron-ethyl for treatment decreased from 355.3 μg/L to 37.8 μg/L and from 10.5 μg/L to 3.9 μg/L, respectively, during consecutive 21 days after herbicide application under natural sunlight. CONCLUSION: The concentration of butachlor in paddy water decreased quickly under ambient conditions with natural sunlight. The degradation of butachlor in paddy water was enhanced by the natural sunlight. However, the degradation of pyrazosulfuron-ethyl was insignificant under natural sunlight.