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Hyeonsoo Jang,Hui-su Bae,Seung-hyun Ahn,Jong-tag Youn,Dea-wook Kim,Wook-han Kim 한국토양비료학회 2020 한국토양비료학회지 Vol.53 No.4
Although the forage production area of Italian ryegrass is expanding in Korea, most of the seeds are imported from abroad. This study was conducted to examine seed productivity of domestic varieties of Italian ryegrass under different soil salinity in reclaimed tideland. Compared to 0.1% of soil salinity, the emergence rate at 0.2 - 0.3% salinity decreased by 7%. The number of ear and grain weight also decreased at the 0.2 - 0.3% of salinity, eventually leading to 23% decreases in seed yield compared to the 0.1% salinity. There was no significant difference in yield components among cultivars, but Greenfarm showed slightly higher yield components than other cultivars. Therefore, when domestic cultivars are harvested in reclaimed land, it is expected to increase the self-sufficiency of domestic seeds and to replace imports of foreign seeds.
Managing Soil Organic Matter and Salinity by Crop Cultivation in Saemangeum Reclaimed Tidal Land
Hyeonsoo Jang,Hui Su Bae,Jae Bok Hwang,Tae Seon Park,Kyo Suk Lee,Dong Sung Lee,Doug Young Chung 한국토양비료학회 2018 한국토양비료학회지 Vol.51 No.1
This study was to evaluate the effect of organic amendments incorporation on soil properties and plant growth under two different soil salinity levels and various cultivated crops at Saemangeum reclaimed tidal land for three years from 2012 to 2014. The soil texture of the experimental site was sandy loam. Four different crops, sesbania (Sesbania grandiflora), sorghum-sudangrass hybrid (Sorghum bicolor-Sorghum sudanense), rice (Oryza sativa L.) and barley (Hordeum vulgare) were cultivated at low (〈 1 dS m<SUP>-1</SUP>) and high (〉 4 dS m<SUP>-1</SUP>) soil salinity levels. The soil salinity was significantly lowered at the rice cultivation site compared to continuous upland crops cultivation site in high soil salinity level. But the soil salinity was increased as cultivating sesbania coutinuously in low soil salinity level. The soil organic matter content was increased with the incorporation of straw at the continuous site of rice and barley, and the average of soil organic matter was increased by 0.9 g kg<SUP>-1</SUP> per year which was effective in soil aggregate formation. The highest biomass yield plot was found in barley (high salinity level) and sesbania (low salinity level) cultivation site, respectively. Our research indicates that rice cultivation in paddy field with high salinity level was effective in lowering soil salinity and sesbania cultivation was useful to biomass production at upland with low salinity. In conclusion, soil salinity and organic matter content should be considered for multiple land use in newly reclaimed tidal land.
Hyeonsoo Jang,Jong-Tak Youn,Seunghyun Ahu,Uk-Han Kim,Won-Yeong Choi,Hui-su Bae 한국토양비료학회 2018 한국토양비료학회지 Vol.51 No.4
This study was conducted to examine the yield and antioxidant activity of vegetable crops under the salt affected greenhouse soil in order to evaluate the possibility of greenhouse farming in “Saemangeum reclaimed land”. Field experiment was conducted on a sandy loam soil and four different vegetable crops, Swiss chard (Beta vulgaris L.), Kale (Brassica oleracea ver. acephala), Red mustard (Brassica juncea L.), and Endive (Cichorium endivia L.) were cultivated. In the third year of the experiment, the soil salinity dramatically increased up to 23.5 dS m<SUP>-1</SUP> from 2.2 dS m<SUP>-1</SUP> in the first year of the experiment due to the resalinization of soil. The cumulative yield was 2,675 kg 10a<SUP>-1</SUP> (Endive) > 2,560 kg 10a<SUP>-1</SUP> (Red mustard) > 1,819 kg 10a<SUP>-1</SUP> (Kale) > 1,795 kg 10a<SUP>-1</SUP> (Swiss chard). Yield was inversely correlated with soil salinity (R<SUP>2</SUP> = 0.71-0.77) but the red mustard was not significantly correlated with soil salinity. Both DPPH free radical activity and total phenol content were higher with red mustard. K/Naleaves ratio as an indication of the salt tolerance was in the order of Red mustard > Endive ≥ Swiss chard ≥ Kale.
자율주행 안정성 향상을 위한 인식 필터 설계 및 속도 제어 방법
장현수(Hyeonsoo Jang),송재민(Jaemin Song),김현수(Hyeonsoo Kim),서석현(Sukhyun, Seo) 한국자동차공학회 2020 한국자동차공학회 학술대회 및 전시회 Vol.2020 No.11
An important factor in developing self-driving cars is to ensure stability in driving. To do this, it is necessary to design a filter with good performance or implement an autonomous driving system by applying a function that is strong against external noise. In this paper, methods for improving the stability of autonomous driving are presented. When detecting lanes, a median filter is applied and a function to recognize only linear changes has been added. In addition, the vehicle does not deviate from the lane through speed control during steering. Using the position of the obstacle measured using the Lidar and the detected lane, it avoids the obstacle without leaving the lane. Crosswalk recognition must satisfy two conditions: pattern recognition and color detection. By using AR markers for parking, functions can be performed regardless of light, terrain, or obstacles.
장지훈(Jihoon Jang),한가람(Karam Han),유근실(Geun Sil Yu),이욱륜(Wook Ryun Lee),임현수(HyeonSoo Lim),박호영(Ho Young Park) 한국연소학회 2019 한국연소학회지 Vol.24 No.2
Devolatilization behavior of pulverized coal in a drop tube furnace (DTF) has been calculated with the measured gas temperature and velocity. The particle temperature and velocity were calculated from the energy and momentum equations of particle by using the fourth order Runge-Kutta method. The volatile evolved from the particle along with the reactor tube was also calculated varying the wall temperature of reaction tube as well as the particle diameter. The optimal kinetic parameters of subbituminous coal were obtained from the volatile evolution data of the devolatilization experiment in the DTF by error minimization.
CT조영제가 방사선치료계획(두경부, 전립선)에 미치는 영향
장재욱(Jaeuk Jang),한만석(Manseok Han),김민정(Minjeong Kim),강현수(Hyeonsoo Kang) 한국자기학회 2016 韓國磁氣學會誌 Vol.26 No.5
This study is to evaluate the effect of a Contrast Media (CM) on dose calculations and clinical significance in Radiation (Electromagnetic wave) Therapy (RT) plans for head & neck (H&N) and prostate cancer. Pinnacle 8.0 system was used to measure the change of Electron Density (ED) of the tissue for CM. To determine the effect of dose calculation due to CM, we did the RT planning for 30 patients. To compare the ED and dose calculations of RT plans, 3D CRT and IMRT plans were do with pinnacle and Tomotherapy planning system. Mean difference of ED between enhanced and unenhanced CT was less than 4%: H&N Target Volume (TV) 2.1%, parotid 1.9%, SMG 3.6%, tongue 0.9%, spinal cord 0.3%, esophagus 2.6%, mandible 0.1% and prostate TV 0.7%, lymph node 1.1%, bladder 1.2%, rectum 1.5%, small bowel 1.2%, colon 0.6%, penile bulb 0.8%, femoral head −0.2%. The dose difference between RT plan using CM and without CM showed an increase of dose in TV. The rate of increase was less than 2.5% (3D CRT: H&N 0.69~2.51%, prostate 0.04~1.14%, IMRT: H&N 0.58~1.31%, prostate 0.36~1.04%). RT plans using a CM has the insignificant effect on the organs and TV, so this error is allowable clinically. However, the much more accurate plan is possible as to image fusion (CM and without CM images) to ROI contour and when dose calculation, use the without CM image. Using the fusion of ‘ROI import’ perform calculations on without CM, it will be able to reduce the error (1~3%) caused by the CM.
BEAT 프로그램을 이용한 건물에너지 retrofit 요소들 간의 에너지 절감 관계분석
김현수(Kim, Hyeonsoo),최기원(Choi, Ki-won),장지훈(Jang, Ji-hoon),강경모(Kang, Kyung-mo),이승복(Leigh, Seung-Bok) 대한건축학회 2017 大韓建築學會論文集 : 構造系 Vol.33 No.2
Recently, Korean government is successively driving energy saving policies. Nevertheless, the use of energy is continuously increasing, and shift toward a low-energy society is somewhat out of our expectation. The major goal of building energy retrofit is to optimize energy consumption in existing buildings which are under deterioration. Many of these old buildings with lower efficiency spend more energy than newly built ones. Thus, this paper suggests a reasonable guideline for energy retrofit. A government office building located in Kangdonggu, Seoul is selected as the subject building, and a modified bin-method called BEAT(Building Energy Analysis Tool) program is used for the analysis. The primary goal of this research is to find the best combination of influencing factors that can improve energy efficiency in old buildings. Such factors stem from design components of Building, System and also Operational facets of a building. By applying the input standards from "Green remodeling guidelines", heating energy can be reduced by 38.28% in the winter and 38.50% of cooling energy in the summer. Most of the factors contributed to reducing energy consumption except for SC(Shading Coefficient) and Internal lighting to heating energy. This is due to the blockage of solar heat gain and decrement of internal heat respectively, which results in a higher demand for heating in the winter. Finally, the total energy(HVAC+Lighting+Office equipment) on a yearly basis, can be reduced by 38.89% when all the considering factors are applied in combination. The study will further move to analyze the best solution for building energy retrofit.