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Steroid Hormone이 흰쥐 자궁의 Acetylcholine 및 칼슘함량에 미치는 영향
홍석영 中央醫學社 1971 中央醫學 Vol.21 No.6
The content of acetylcholine and calcium in rat uterus during normal estrous cycle was measured and the effect of steroid hormone was studied. During the normal estrous cycle, the content of calcium and acetylcholine showed no significant correlation. The content of acetylcholine in rat uterus showed some changes during estrous cycle, highest at diestrus and lowest at metestrus. The content of acetylcholine and calcium in rat uterus treated' with steroid hormone showed positive correlation. With progesterone treatment, there increased acetylcholine content and concomitant by increased in calcium content. In estrogen treated group, significant decrease of acetylcholine content was observed with decreased calcium content. It suggests that acetylcholine and calcium will influence on physiological phenomena during normal estrous cycle in uterus.
Status of Rice Paddy Field and Weather Anomaly in the Spring of 2015 in DPRK
홍석영,박혜진,장근창,나상일,백신철,이경도,안중배 한국토양비료학회 2015 한국토양비료학회지 Vol.48 No.5
To understand the impact of 2015 spring drought on crop production of DPRK (Democratic People’s Republic of Korea), we analyzed satellite and weather data to produce 2015 spring outlook of rice paddy field and rice growth in relation to weather anomaly. We defined anomaly of 2015 for weather and NDVI in comparison to past 5 year-average data. Weather anomaly layers for rainfall and mean temperature were calculated based on 27 weather station data. Rainfall in late April, early May, and late May in 2015 was much lower than those in average years. NDVI values as an indicator of rice growth in early June of 2015 was much lower than in 2014 and the average years. RapidEye and Radarsat-2 images were used to monitor status of rice paddy irrigation and transplanting. Due to rainfall shortage from late April to May, rice paddy irrigation was not favorable and rice planting was not progressed in large portion of paddy fields until early June near Pyongyang. Satellite images taken in late June showed rice paddy fields which were not irrigated until early June were flooded, assuming that rice was transplanted after rainfall in June. Weather and NDVI anomaly data in regular basis and timely acquired satellite data can be useful for grasping the crop and land status of DPRK, which is in high demand.
위성영상을 이용한 북한의 농업환경 분석 -I. Landsat TM 영상을 이용한 북한의 지형과 토지피복분류-
홍석영,임상규,이승호,이정철,김이현 한국환경농학회 2008 한국환경농학회지 Vol.27 No.2
Remotely sensed images from a satellite can be applied for detecting and quantifying spatial and temporal variations in terms of landuse & landcover, crop growth, and disaster for agricultural applications. The purposes of this study were to analyze topography using DEM(digital elevation model) and classify landuse & landcover into 10 classes - paddy field, dry field, forest, bare land, grass & bush, water body, reclaimed land, salt farm, residence & building, and others - using Landsat TM images in North Korea. Elevation was greater than 1,000 meters in the eastern part of North Korea around Ranggang-do where Kaemagowon was located. Pyeongnam and Hwangnam in the western part of North Korea were low in elevation. Topography of North Korea showed typical 'east-high and west-low' landform characteristics. Landcover classification of North Korea using spectral reflectance of multi-temporal Landsat TM images was performed and the statistics of each landcover by administrative district, slope, and agroclimatic zone were calculated in terms of area. Forest areas accounted for 69.6 percent of the whole area while the areas of dry fields and paddy fields were 15.7 percent and 4.2 percent, respectively. Bare land and water body occupied 6.6 percent and 1.6 percent, respectively. Residence & building reached less than 1 percent of the country. Paddy field areas concentrated in the A slope ranged from 0 to 2 percent (greater than 80 percent). The dry field areas were shown in the A slope the most, followed by D, E, C, B, and F slopes. According to the statistics by agroclimatic zone, paddy and dry fields were mainly distributed in the North plain region(N-6) and North western coastal region(N-7). Forest areas were evenly distributed all over the agroclimatic regions. Periodic landcover analysis of North Korea based on remote sensing technique using satellite imagery can produce spatial and temporal statistics information for future landuse management and planning of North Korea.
Landsat TM 화상을 이용한 당진군 일원의 논면적 추정
홍석영,임상규,이규성,조인상,김길웅 한국농림기상학회 2001 한국농림기상학회지 Vol.3 No.1
For estimating paddy field area with Landsat TM images, two dates, May 31, 1991 (transplanting stage) and August 19, 1991 (heading stage) were selected by the data analysis of digital numbers considering rice cropping calendar. Four different estimating methods (1) rule-based classification method, (2) supervised classification(maximum likelihood), (3) unsupervised classification (ISODATA, No. of class:15), (4) unsupervised classification (ISODATA, No. of class:20) were examined. Paddy field area was estimated to 7291.19 ha by non-classification method. In comparison with topographical map (1:25,000), accuracy for paddy field area was 92%. A new image stacked by 10 layers, Landsat TM band 3, 4, 5, RVI, and wetness in May 31, 1991 and August 19, 1991 was made to estimate paddy field area by both supervised and unsupervised classification method. Paddy field was classified to 9100.98 ha by supervised classification. Error matrix showed 97.2% overall accuracy for training samples. Accuracy compared with topographical map was 95%. Unsupervised classifications by ISODATA using principal axis. Paddy field area by two different classification number of criteria were 6663.60 ha and 5704.56 ha and accuracy compared with topographical map was 87% and 82%. Irrespective of the estimating methods, paddy fields were discriminated very well by using two-date Landsat TM images in May 31, 1991 (transplanting stage) and August 19, 1991 (heading stage). Among estimation methods, rule-based classification method was the easiest to analyze and fast to process.
미래사회 대비 지구과학교육의 방향과 지구과학과 핵심개념에 대한 교사들의 인식
홍석영,곽영순 한국현장과학교육학회 2022 현장과학교육 Vol.16 No.2
본 연구에서는 미래사회에서 강조해야 할 지구과학교육의 방향과 지구과학과 핵심개념에 대한 교사들의 인식을 조사하였다. 이를 위해 2030-2040년의 미래사회의 사회・기술・경제・환경・정치(STEEP) 분야별 변화양상에 초점을 맞추어, 지구과학교육이 지향해야 할 방향과 핵심개념에 대하여 현직 지구과학 교사들을 대상으로 설문조사를 실시하였다. 총 112건의 유효한 응답을 확보하여 각 미래사회 분야별 변화에 따른 지구과학교육의 방향성과 지구과학 교과의 핵심개념에 대한 응답 빈도와 비율을 살펴보았다. 또한, 네트워크 분석방법을 활용하여 응답에서 나타나는 구조적인 관계와 의미 지형을 파악하였다. 연구결과를 미래사회 변화에 따른 지구과학교육 방향 측면, 미래사회 지구과학교육에서 강조해야 하는 핵심개념, 이러한 핵심개념을 강조해야 하는 이유 등으로 구분하여 지구과학교사들 인식과 요구를 제시하였다. 주요 연구결과로는, 지구과학 교사들은 미래사회 변화에 따른 지구과학교육 방향으로 친환경 및 지속가능발전 교육, 글로벌 디지털 소양 및 시민의식 교육, 과학소양 교육 등을 강조하였으며, 지구과학교육의 일반화된 지식뿐만 아니라 이러한 지식을 탐구하고 활용하는 과정・기능 측면의 교육내용도 강조하였다. 연구결과를 토대로 미래지향적인 지구과학교육의 방향성과 핵심개념, 그리고 후속연구 등을 제안하였다.