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.

Yield and Antioxidant Activity of Vegetable Crops Under Salt Affected Greenhouse Soil in Saemangeum Reclaimed 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.

Growth Characteristics and Seed Productivity of Italian Ryegrass (Lolium multiflorum L.) Cultivars under Different Salinity in Saemangeum Reclaimed Tideland

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.

돌발상황 시 자율주행차량 통행지원 강화학습을 위한 통행규칙 설계

장현수(Hyeonsoo Jang),박준엽(Junyeop Park),강병주(Byeongju Kang),황윤형(Yunhyoung Hwang),곽수진(Sujin Kwag) 한국자동차공학회 2023 한국자동차공학회 학술대회 및 전시회 Vol.2023 No.11

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.

사무용 건물에서 전열교환 환기시스템과 일반공조기의 냉방에너지 비교분석에 관한 연구

장지훈(Jang, Ji-Hoon),김현수(Kim, Hyeonsoo),어진선(Auh, Jin-Sun),이승복(Leigh, Seung-Bok),김병선(Kim, Byungseon-Sean) 한국생태환경건축학회 2016 한국생태환경건축학회 논문집 Vol.16 No.6

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.

Aspect of weed occurrence in soybean and corn cultivation at paddy field in the first year of paddy-upland rotation

Seunghyun Ahn,Hyeonsoo Jang,Inbea Choi,Huisu Bae,Ukhan Kim,Jongtag Youn 한국농약과학회 2018 한국농약과학회 학술발표대회 논문집 Vol.2018 No.10

안내사인의 복잡성과 이용자 인지의 관계에 관한 연구 - 도시철도 환승역사 사례를 중심으로 -

김현수 ( Kim Hyeonsoo ),장영호 ( Jang Youngho ),김주연 ( Kim Jooyun ) 한국공간디자인학회 2020 한국공간디자인학회논문집 Vol.15 No.3

(연구배경 및 목적) 지역의 경제, 문화, 산업의 발전의 중요한 운송수단인 도시철도는 대중교통 인프라를 구축하는데 큰 기여를 하게 되며, 새로운 노선이 증가함에 따라 역사 내부는 한정된 공간내에서 복잡해지고 대형화가 되어가고 있다. 이용자의 입장에서 읽기 쉬운 정보 안내사인에 대한 요구도 계속해서 증가하고 있다. 현재 우리나라의 경우에는 도시철도역사 건축이 완료된 후에 운영사마다 각기 다른 매뉴얼을 통해 안내사인을 계획 및 설치하는 경향이 강하여 정보의 복잡성이 나타나고 있다. 이에 본 연구는 도시철도 환승역사에 대한 분석을 통해 역사 내에서 나타나는 정보의 복잡성이 이용자의 입장에서 어떻게 적용하는지를 파악하고, 용이한 정보전달을 위해 필요한 요소를 추출하는 것을 목적으로 한다. (연구방법) 본 연구는 복잡성을 가진 환승역사와 이용자의 인지성에 초점을 두고 이론 고찰 및 선행연구 조사를 통해 복잡성이 환승역사 이용자들의 인지에 미치는 영향에 관하여 연구하고 공공의 관점에서 안내사인에 대한 구성요소를 파악한다. 이러한 연구결과를 토대로 하여 도출한 평가 지표를 기반으로 국내·외 총 6개소의 사례를 대상으로 하여 비교 분석하고 복잡성이 환승역사 이용자들의 인지에 미치는 영향의 문제점 및 개선방향을 도출한다. (결과) 본 연구에서는 이용자의 인지 과정에서 발생하는 정보들의 과부하 현상이나 인지 부하 현상을 통해 정보의 소화 판단 결정이 더 많이 작용하도록 유도하므로 이용자들이 혼돈 및 스트레스를 초래하게 되어 안내사인 인지에 크게 영향을 미치게 되는 것을 알 수 있다. 이는 안내사인 체계에 대한 통합가이드라인의 부재, 혹은 미적용에 따라 계속해서 추가되는 새로운 노선과 환승역이 되는 경우 무계획적으로 안내사인이 추가하게 되면서 점차 역사 내 안내사인의 복잡성이 증가함에 따라 이용자에게 불편과 이동간의 동선 흐름에 영향을 끼치게 된다. (결론) 본 연구는 도시철도 안내사인의 복잡성이 이용자의 인지에 영향을 미친다는 관점에서 복잡성과 인지복잡성 및 인지에 대한 이론적 고찰을 통해 인지복잡성이 증가하고 인지 효율이 떨어지는 결과를 도출하였다. 그러므로 복잡성 개선을 위하여 시지각적, 심리적 접근성의 강화가 필요하며 이용자 중심에서 연속성을 높이는 안내사인의 구성 및 배치가 필요하다. 또한 명료성을 확보하고 연계성을 높여 이용자의 자연스러운 동선 유도를 통해 만족도를 높여야 한다. 따라서 현재 점차 복잡해지고 대형화가 되어가는 도시철도역사에 대응하기 위해 추가적인 연구가 필요하고, 통합적으로 운용될 수 있는 가이드라인의 개발 및 적용을 활성화할 수 있는 방식에 대한 연구가 필요하다. (Background and Purpose) Metro, which is an important means of transport for the development of the region’s economy, culture, and industry, has made a significant contribution to the construction of public transportation infrastructure. As an increasing number of new routes have emerged, station building interiors have become more complex and large-scale, and the need for easy-to-read metro signboards has become more urgent. Currently, there is a strong tendency in Japan to plan and install signboards using different manuals for each operating company after construction on a metro station building has been completed; thus creating information complexity. The purpose of this research is to understand information complexity in metro stations from users’ standpoint by analyzing the metro’s transfer station buildings with the goal of extracting the elements that facilitate easy information transmission. (Method) With a focus on metro station users’ recognition, this study examines how information complexity affects metro station users through theoretical consideration, the review of prior research, and looking at signboard components from a public point of view. Six cases, both domestic and abroad, were compared and analyzed, and problems and improvement directions pertaining to how information complexity affects metro station users’ recognition were derived. (Results) Since the information digestion decision is more frequently stimulated by the overload and cognitive load phenomena with respect to information in users’ cognitive processes, users were found to experience confusion and stress, which greatly influence their cognitive recognition of signboards. In the case of a new route or a transfer station that is added due to the absence or non-application of an integrated signboard system guideline, unplanned guidance prevails, and as the complexity of the guidance that is offered in the metro station gradually increases, the flow of traffic between user inconvenience and movement is affected. (Conclusions) Increased cognitive complexity and reduced cognitive efficiency were noted, based on a theoretical consideration of information complexity, cognitive complexity, and recognition. In sum, the complexity of metro signboards affects user recognition. It is therefore necessary to strengthen visual perception and psychological access, and organize and deploy a guide that enhances user-centered continuity. In addition, to ensure clarity, there must be enhanced cooperation. Furthermore, satisfaction can be increased through natural-flow line guidance for users. Further research is needed to address ever-increasing metro station complexity and size, and research on ways to stimulate the development and application of comprehensive guidelines is urgently needed.