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이현수(Lee,Hyeon-soo),김병주(Kim, Byoung-Joo) 한국교육재정경제학회 2022 敎育財政 經濟硏究 Vol.31 No.1
본 연구는 사립유치원 에듀파인 시스템 정책 집행과정에서 나타나는 직무상 어려움과 이에 대한 유치원 원장들의 대응 방식을 분석함으로써 에듀파인이 사립유치원에서 어떤 양상으로 집행되고 있는지 파악하기 위해 수행되었다. 이를 위해 대구광역시교육청 소속 8개 사립유치원의 원장을 대상으로 심층 면담을 실시하였으며, 분석 결과는 다음과 같다. 첫째, 사립유치원은 만성적 자원 부족에 시달리고 있었으며, 이는 급격한 정책 도입 과정에 기인하였다. 둘째, 사립유치원은 자신의 권위에 대해 사회적으로 상당한 수준의 위협을 느꼈던 것으로 나타났다. 셋째, 사립유치원에 도입된 에듀파인 시스템 일부는 사립유치원의 특성을 반영하지 못하고 있었으며, 이는 도입 과정에서 관계자들과의 논의가 충분하지 못하였음을 시사한다. 이상과 같은 결과를 바탕으로 사립유치원 전용 에듀파인 시스템의 보완 및 개선, 원장들의 인식 변화 및 정책적 협력의 필요성 등을 제안하였다. The purpose of this study was to analyze the working conditions in the implementation process of the Edu-Fine system for private kindergartens and the strategies used by kindergarten principals to implement it. To this end, interviews were conducted with the eight principals of the private kindergartens belonging to the Daegu Metropolitan Office of Education. The reulsts are as follows. First, private kindergartens are suffering from chronic resource shortages, due to the rapid and radical introduction of policy. Second, private kindergartens were found to have felt a significant social threat to their authority. Third, some of the Edu-Fine systems introduced in private kindergartens do not reflect the characteristics of private kindergartens, suggesting that discussions with officials were insufficient in the introduction process. Based on the above results, this study proposed the needs to supplement and improve the Edu-Fine system for private kindergartens, change the perception of the kindergarten principals, and policy cooperation.
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.
Hyeonsoo Jo,Seunghun Lee,Jaehee Lee,Eunjong Kim,Heekwon Ahn 한국토양비료학회 2016 한국토양비료학회지 Vol.49 No.3
The influence of mixing on biogas production and organic material removal performance of solid state anaerobic digestion of dairy manure and sawdust bedding mixtures was evaluated using 22 L volume lab-scale digesters. After 45 days of anaerobic digestion at 37°C, cumulative methane yield of unmixed test unit (73.1 N·mL/g-VS) was almost 1.3 times of that of mixed one (56.3 N·mL/g-VS). The biodegradable volatile solids removal rate of unmixed test unit was 67%, which was almost 28% greater than mixed one. Our results reveal that unmixed condition is better than mixed one in terms of biogas production and organic material reduction.
Hyeonsoo Jo,Seunghun Lee,Eunjong Kim,Heekwon Ahn 한국토양비료학회 2017 한국토양비료학회지 Vol.50 No.4
This experiment was conducted to evaluate the effect of leachate replacement frequency on solid state anaerobic digestion (SSAD) of dairy manure using 22 L volume lab-scale digesters at mesophilic temperature(37°C) in batch mode. Three different leachate replacement strategies (no replacement, once every three days, and once every nine days) were applied and three digesters per each treatment were operated for 45 days. Results showed that leachate replacement test unit every nine days resulted in 1.6 times more methane production (53.8 N·mL g<SUP>-1</SUP>·VS) from SSAD compared to test unit every three days (34.0 N·mL g<SUP>-1</SUP><SUP></SUP>·VS). No leachate replacement strategy applied group showed slightly higher methane production (56.3 N·mL g<SUP>-1</SUP>·VS) than every nine days replaced one. When added the methane production potential of replaced leachate itself to the methane produced from digester, leachate replacement every nine days resulted in quite similar methane production (56.5 N·mL g<SUP>-1</SUP>·VS) to no leachate replacement group. Even though methane production potential of replaced leachate itself added to the methane produced from digester, every three days replacement showed only 34 N·mL methane production per gram of volatile solids. These results suggest that farmers do not need to replace leachate during SSAD of dairy manure and sawdust mixture in order to maximize methane production. If there are any concerns with accumulation of inhibiting substances in the digester, the 9-day cycle leachate replacement is appropriate.
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.
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.