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노지 작물의 적정 관개계획을 위한 토양수분의 공간변이성 분석
최용훈,김민영,김영진,전종길,서명철,Choi, Yonghun,Kim, Minyoung,Kim, Youngjin,Jeon, Jonggil,Seo, Myungchul 한국농공학회 2016 한국농공학회논문집 Vol.58 No.5
Due to droughts and water shortages causing severe damage to crops and other vegetations, much attention has been given to efficient irrigation for upland farming. However, little information has been known to measure soil moisture levels in a field scale and apply their spatial variability for proper irrigation scheduling. This study aimed to characterize the spatial variability and temporal stability of soil water contents at depths of 10 cm, 20 cm and 30 cm on flat (loamy soil) and hill-slope fields (silt-loamy soil). Field monitoring of soil moisture contents was used for variogram analysis using GS+ software. Kriging produced from the structural parameters of variogram was applied for the means of spatial prediction. The overall results showed that the surface soil moisture presented a strong spatial dependence at the sampling time and space in the field scale. The coefficient variation (CV) of soil moisture was within 7.0~31.3 % in a flat field and 8.3~39.4 % in a hill-slope field, which was noticeable in the dry season rather than the rainy season. The drought assessment analysis showed that only one day (Dec. 21st) was determined as dry (20.4 % and 24.5 % for flat and hill-slope fields, respectively). In contrary to a hill-slope field where the full irrigation was necessary, the centralized irrigation scheme was appeared to be more effective for a flat field based on the spatial variability of soil moisture contents. The findings of this study clearly showed that the geostatistical analysis of soil moisture contents greatly contributes to proper irrigation scheduling for water-efficient irrigation with maximal crop productivity and environmental benefits.
崔容勛 한국현대영미어문학회 2001 The Journal of KACELLS Vol.6 No.1
In the tradition of American drama, Edward Albee has taken a specific place as one of the most competent and intelligent playwrights. Throughout his long career, he has attracted much attention from the audience and critics alike. But his success as a major dramatist was never attained by accident but a natural product of his early interest in writing novels and poems. Albee's early plays are closely related to his individual life. His departure from literary convention and his temperament as a bum have much to do with a tragic situation in which he was placed as a deserted child. Though adopted by a rich family, he couldn't escape from his spiritual wandering and agony. In particular, he was the very picture of criticism against the corrupted bourgeois society. As shown in his careers, his life, in essence, is the continuation of wandering. Roaming along the streets of New York, he saw a lot of people from almost all walks of life. Their lives and expreriences are deeply embedded in his early plays. Particularly noteworthy is the fact that six of his nine early plays are about 'a deserted child' and 'a permanent transient.' In The Zoo Story, Albee touchingly describes a social outcast isolated from other people and the world. The two characters, Jerry and Peter, are the ordinary people we come across on the streets. But they are also the allegory of fundamental human loneliness and alienation regardless of time and place. In Jerry and Peter, we can find the image of ourselves in a modern society. This paper aims to analyze the aspects of human relations as suggested in The Zoo Story. For this, it deals with the four main categories of human relations; the absence of communication, sexual obssession, animalistic nature, and physical contacts and violence. All these concepts have constituted the philosophical background of Albee's plays. His main concern was to suggest a more univeral human situation and a dilemma facing a contemporary society. In The Zoo Story, Albee shows how human relations are distorted and how eager we have been to get out of human isolation and alienation. But he is never a pessimist. By giving religious implications to Jerry's death, Albee suggests the possibility of change in distorted human relations. While caputring the dark side of human relations and the contemporary society, the playwright also talks about new hope and optimism.
작물 수분 스트레스 지수 산정을 위한 최적의 관측 간격과 시간에 대한 통계적 분석
최용훈,김민영,오우현,조정건,윤석규,이상봉,김영진,전종길 한국농공학회 2019 한국농공학회논문집 Vol.61 No.6
Continuous and tremendous data (canopy temperature and meteorological variables) are necessary to determine Crop Water Stress Index (CWSI). Thisstudy investigated the optimal monitoring time and interval of canopy temperature and meteorological variables (air temperature, relative humidity, solarradiation and wind speed) to determine CWSIs. The Nash-Sutcliffe model efficiency coefficient (NSE) was used to quantitatively describe the accuracyof sampling method depending upon various time intervals (t=5, 10, 15, 20, 30 and 60 minutes) and CWSIs per every minute were used as a reference. The NSE coefficient of wind speed was 0.516 at the sampling time of 60 minutes, while the ones of other meteorological variables and canopytemperature were greater than 0.8. The pattern of daily CWSIs increased from 8:00 am, reached the maximum value at 12:00 pm, then decreased after2:00 pm. The statistical analysis showed that the data collection at 11:40 am produced the closest CWSI value to the daily average of CWSI, whichindicates that just one time of measurement could be representative throughout the day. Overall, the findings of this study contributes to the economicaland convenient method of quantifying CWSIs and irrigation management.
비강우시 도시 합류식 하수도의 오염부하 산정을 위한 최적관측시간 산정연구
최용훈,원철희,박운지,서지연,신민환,이찬기,최중대,Choi, Yong-Hun,Won, Chul-Hee,Park, Woon-Ji,Seo, Ji-Yeon,Shin, Min-Hwan,Lee, Chan-Ki,Choi, Joong-Dae 한국농공학회 2009 한국농공학회논문집 Vol.51 No.3
Flow and pollution load were monitored at 2 combined sewer outlets (C-1 and C-2) of urban watersheds during dry weather from September, 2004 to April, 2006 for 20 months. The objectives were to investigate the diurnal variation of flow and pollutant load and to find the proper sampling time that could measure representative flow and pollutant load. Pollution load closed to the average daily load at C-1 could be measured at 00:00 hour and by the mean of 15:00 and 18:00 hour measures, and 15:00 and 21:00 hour measures, respectively. In addition at C-2, it was 21:00 hour and the mean of 15:00 and 18:00 hour measures. This study concluded that arbitrary sampling of flow and water quality could cause large errors in the estimation of urban pollution load and recommended that urban combined sewers should be monitored when flow and water quality showed daily average and concentration.
소규모 밭 관개용수 확보를 위한 소류천 빗물 집수장치의 현장 평가
최용훈,김영진,김민영,전종길 한국농공학회 2018 한국농공학회논문집 Vol.60 No.1
A rainwater harvesting device was developed for runoff flow harvesting in a small stream or channel and its performance was evaluated in small fields. The rainwater harvesting device has slits on its side of cylindrical volume in 15 cm diameter and 70 cm length, which is designed to increase its water flow harvesting capacity. The maximum collectable water quantity was about 0.0022 ton/sec (130 L/min). Rainwater harvesting device were installed in two locations (P1, P2). P1 is a point for rainfall runoff flow harvesting. P2 is a point for ordinary flow harvesting. During this study, total rainfall depth was 334.5 mm. Runoff of 1,722 ton and 7,984 ton occurred in P1 and P2, and 273 ton and 125 ton were collected by this rainwater harvesting device. Harvesting efficiency was calculated as 15.85 % and 1.57 % in P1 and P2. Clogging of screen filter media in the cylinder due to soil and suspended solids has lowered the harvesting efficiency. However, it was possible to harvest 30 ton/month of rainwater harvesting and it is expected that it will help to solve short-term water shortage.