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Changes of Soil Properties and Temperature by Green Manure under Rice-based Cropping System
Jeon, Weon-Tai,Kim, Min-Tae,Seong, Ki-Yeong,Lee, Jong-Ki,Oh, In-Seok,Park, Sung-Tae The Korean Society of Crop Science 2008 Korean journal of crop science Vol.53 No.4
The cultivation of green manure crop is considered as a good management practice by increasing soil organic matter and fertility levels. This experiment was conducted to improve the soil environment under rice-based cropping system at paddy soil (fine loamy, mixed, nonacid, mesic, family of Aeric Fluventic Haplaquepts) in National Institute of Crop Science (NICS), Korea in 2006 to 2007. The variation of soil temperature in green manure plots was lower than without green manure (control) during spring season (April to May). The temperature variation of no tillage plot (broadcast before rice harvest) was the lowest among treatments. After green manure cropping, the soil bulk density and porosity ratio were improved at the top soil. The production of green manure was the highest athairy vetch and barley mixture plot by partial tillage. However, mixture treatment had no improvement on soil organic matter. After rice cropping with green manure application, soil quality was improved such as soil physical properties except mixture treatment. Therefore, we suggest that soil quality should be improved by green manure cultivation under rice-based cropping system.
YEONG-KEONG HA,김정석,YOUNG SHIN JEON,한선호,HANG SEOK SEO,송규석 한국원자력학회 2010 Nuclear Engineering and Technology Vol.42 No.1
Spent UO2 nuclear fuel discharged from a nuclear power plant (NPP) contains fission products, U, Pu, and other actinides. Due to neutron capture by 238U in the rim region and a temperature gradient between the center and the rim of a fuel pellet, a considerable increase in the concentration of fission products, Pu, and other actinides are expected in the pellet periphery of high burnup fuel. The characterization of the radial profiles of the various isotopic concentrations is our main concern. For an analysis, spent nuclear fuels originating from the Yeonggwang-2 pressurized water reactor (PWR) were chosen as the test specimens. In this work, the distributions of some actinide isotopes were measured from center to rim of the spent fuel specimens by a radiation shielded laser ablation inductively coupled plasma mass spectrometer (LA-ICP-MS)system. Sampling was performed along the diameter of the specimen by reducing the sampling intervals from 500 μm in the center to 100 μm in the pellet periphery region. It was observed that the isotopic concentration ratios for minor actinides in the center of the specimen remain almost constant and increase near the pellet periphery due to the rim effect apart from the 236U to 235U ratio, which remains approximately constant. In addition, the distributions of local burnup were derived from the measured isotope ratios by applying the relationship between burnup and isotopic ratio for plutonium and minor actinides calculated by the ORIGEN2 code.
요양병원 환자안전사고 관련요인: 환자, 간호사, 병원 요인 중심으로
석나영(Seok Na Yeong),전미양(Jeon Mi Yang) 한국노인간호학회 2020 노인간호학회지 Vol.22 No.2
Purpose: The purpose of this study was to determine the factors related to patient safety accidents in long-term care hospitals. Methods: The participants were 50 patients who had safety accidents during a hospitalization period and 100 patients who had no safety accidents, and were hospitalized during the same period, and had the same gender, age, and underlying diseases as the accident group. A complete enumeration survey was conducted on 85 nurses working in three long-term care hospitals. Results: The patient safety accident rate was 0.62 persons per 1000 hospital days. Regarding harmful incidents of patient safety accidents, step 1 harmful incidents accounted for the highest rate (56.0%). Regarding the type of accident, falls accounted for the highest rate (46.0%). Regarding the place of accidents, hospital rooms accounted for the highest rate (72.0%). The accident group and the nonaccident group had statistically significant differences in cardiac disorders, sedative hypnotics, vasodilators, nootropic agents, antibiotics, wearing an adult diaper, and physical restraints. In terms of nurses, the accident experience group and the non-experience group had a statistically significant difference in their work career (x2=7.69, p=.027). The patient safety culture score was statistically significantly different between hospital 1 and hospital 2 (F=11.07, p=.003). Conclusion: It is necessary to develop systems and strategies that handle all three factors to enhance the patient safety culture in the long-term care hospitals.
전영미(Yeong Mi Jeon),정석찬(Seok Chan Jeong) 한국정보통신학회 2021 한국정보통신학회 종합학술대회 논문집 Vol.25 No.2
본 연구에서는 당뇨망막병증 의증 진단을 위해 영상처리 알고리즘을 이용하여 안저영상을 분석하고, 비트 플레인(Bit Plane) 기법을 활용한 당뇨망막병증 질환의 특징인 경성 삼출물 및 망막 출혈 등의 특정 부위를 추출한다. 분석된 안저영상을 기반으로 당뇨망막병증의 특징을 수치화하고 자동으로 진단이 가능한 시스템을 제안한다. In this study, fundus images were analyzed using an image processing algorithm for diagnosis of diabetic retinopathy, and specific areas such as hard exudate and retinal hemorrhage, which are characteristic of diabetic retinopathy disease using the bit plane technique, were extracted. We propose a system capable of automatic diagnosis by quantifying the characteristics of diabetic retinopathy based on the analyzed fundus image.
농업 부산물 바이오매스 특성에 따른 반탄화 공정 최적화: 1. 질량감소 예측 모델 개발
김석준 ( Seok Jun Kim ),오광철 ( Kwang Cheol Oh ),박선용 ( Sun Young Park ),조라훈 ( La Hoon Cho ),김민준 ( Min Jun Kim ),이충건 ( Chung Geon Lee ),정인선 ( In Seon Jeong ),전영광 ( Yeong Kwang Jeon ),김대현 ( Dae Hyun Kim ) 한국농업기계학회 2018 한국농업기계학회 학술발표논문집 Vol.23 No.2
본 연구에서는 국내에서 버려지고 있는 농업부산물의 에너지로서 이용 가능성이 분석되었다. 농업부산물 바이오매스는 화석연료와 동일하게 활용가능하며 지속적으로 생산되는 에너지원이다. 하지만 높은 수분 함량에 따른 보관문제, 화석연료와 비교하여 낮은 발열량등의 단점을 지니고 있어 전처리공정이 요구된다. 따라서 효율적인 활용을 위한 전처리 공정으로 반탄화가 선정되었다. 반탄화공정은 수분제거를 통해 에너지가 증가되어 저장·운송에 이점으로 인하여 최종적인 에너지 가치가 증대된다. 실험은 문헌탐색을 통한 반탄화공정 적용 가능 농업부산물(고추대)과 실험조건(200, 230, 270C, 10, 20, 30, 40 min)이 선정되었으며, 1차원 시뮬레이션을 통한 분석이 이루어졌다. 이때 반탄화 실험을 통하여 발생되는 질량감소량과 발열량 변화량은 높은 상관관계(r<sup>2</sup>=0.9528)를 가지고 있으며 본 연구에서는 반탄화공정의 질량감소량 예측 모델개발이 수행되었다. 질량감소량 분석을 위하여 열 중량 분석(Thermo Gravimetric Analyzer, TGA)이 수행되었으며 승온속도(5, 7.5, 15, 22.5, 30, 37.5°C min<sup>-1</sup>)에 따른 반응속도상수가 도출되었다. 1차원 시뮬레이션 분석을 통하여 바이오매스 내부 온도를 예측하였으며 앞서 도출된 반응속도 상수를 이용하여 질량감소량이 예측되었다. 질량감소량 실험 및 시뮬레이션 결과 평균 r<sup>2</sup>=0.97로 상관관계를 나타내고 있으며 공정온도별 평균제곱근오차(Root Mean Square Error, RMSE)가 200°C-0.0165, 230°C-0.0191, 270°C-0.0207로 나타났다. 공정온도 증가에 따라 정확도가 감소되었으며, 이는 고온의 실험조건에서 발생되는 비응축가스와 온도변화에 의한 열분해 특성에 기인한 것으로 판단된다. 최종적으로 더 나아가서 질량감소 모델을 통한 발열량 예측을 위한 분석이 이루어져야한다.
원발성 안와내 수막종 : 증례 보고 Case Report
김용현,전판석,장석정 대한신경외과학회 1995 Journal of Korean neurosurgical society Vol.24 No.9
Menigioma arising from the orbit is uncommonly encountered. Ectopic(extradural) meningiomas are exceedingly rare orbital tumors that do not originate from either the optic nerve or the intracranial meninges. We present a case of probable primary ectopic(extradural) orbital meningioma that was successfully treated with a complete surgical excision.
전석현 ( Jeon Seok Hyeon ),이영빈 ( Lee Yeong Bin ),정정식 ( Jeong Jeong Sik ),하민균 ( Ha Min Gyun ),안진희 ( Ahn Jin-hee ) 한국구조물진단유지관리공학회 2017 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.21 No.2
Recently, steel has been very frequently chosen in building many civil infra-structures including bridges due to its several beneficial advantages as compared to concrete structures. However, for the most cases, damage such as section reduction, that is resulted from corrosion, was natural and inevitable. Therefore, it becomes very important to evaluate the structural safety and to estimate the life for the worst cases. In this study, the corrosion behaviors of mock-up specimen with box girder were examined by visual inspection.