• Proceedings of the Plant Resources Society of Korea Conference
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• 2019.04a
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• pp.56-56
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• 2019

본 연구는 식용과 약용으로 이용되는 국내 자생식물인 야산고비(Onoclea sensibilis var. interrupta Maxim.)를 기내에서 대량증식하기 위한 조건을 구명하기 위하여 수행되었다. 무가온 온실에서 수집한 포자를 기내에서 발아시켜 전엽체를 획득하였으며, 계대배양하며 실험의 재료로 사용하였다. 전엽체의 대량증식을 위해 전엽체 0.3g을 메스로 균일하게 다진 후 증류수 1ml와 함께 배지에 고루 펼쳐서 배양하는 방법을 사용하였으며, 증식에 미치는 배지의 영향을 확인하기 위하여 1/4, 1/2, 1, 2배로 조절한 MS배지를 조성하여 8주간 배양하였다. 이후, 증식이 우수한 배지를 선정하여 sucrose와 질소급원의 농도를 조절하였으며, 활성탄을 첨가하여 증식에 미치는 영향을 확인하였다. 배지종류 실험의 결과, 생체중이 1MS에서 10.2g으로 초기 접종량에 비해 가장 많이 증가하였으며, 현미경을 이용하여 관찰한 결과에서도 정상적인 전엽체의 형태인 심장형으로 발달하였다. 증식이 우수하였던 1MS배지에 sucrose의 농도를 조절하여 배양한 결과에서는 1%의 처리구에서 가장 증식률이 좋았으며, 질소급원의 경우 30mM의 농도로 조절한 처리구가 가장 좋은 결과를 보였다. 배지 내 활성탄의 첨가는 처리구당 증가된 전엽체의 생체중이 유의적인 차이를 보이지 않았다. 포자체 대량 형성을 위한 적정 배양토의 혼합조건을 확인하기 위하여 원예상토, 피트모스, 펄라이트 및 마사토의 혼합비율을 5종류로 달리하여 조성하여 사각분($7.5{\times}7.5{\times}7.5cm$)에 충진하였다. 조성한 배양토에 기내에서 배양한 전엽체 1g을 증류수와 함께 블렌더를 이용하여 10초간 분쇄하여 토양표면에 고루 분주하였다. 이후 12주간 재배한 결과, 모든 토양조합에서 포자체가 형성되었다. 그중 원예상토와 마사토를 2:1(v:v)로 혼합한 토양에서 포트 당 405.0개로 가장 많은 포자체가 형성되었으며, 전체적인 생육 또한 비교적 양호한 결과를 보였다. 따라서 야산 고비의 전엽체 대량증식에 적합한 배지는 경제성과 생육수준을 고려하여 1%의 sucrose와 질소급원의 농도를 30mM로 조절한 1MS 배지가 적합하며, 포자체 대량생산을 위해서는 원예상토, 마사토를 2:1(v:v)로 혼합한 토양이 적합하다고 판단되었다.

• Proceedings of the Plant Resources Society of Korea Conference
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• 2019.10a
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• pp.36-36
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• 2019

정향풀[Amsonia ellipotica (Thumb.) Roem. & Schult.]은 5월에 백색의 취산꽃차례로 개화하여 관상가치가 높다고 판단되나, 전국에 자생지가 10곳 미만이며 한국적색목록에 위기종(EN)으로 평가되어 체계적인 번식 및 재배법 개발이 요구된다. 본 연구는 유전자원보전 및 신 관상소재로 개발 가능한 정향풀의 효과적인 육묘법을 확립하고자 수행되었다. 실험재료는 유용식물증식센터에서 분양받은 종자를 사용하였으며, 파종용기(72, 105 및 128구 트레이), 파종립수(셀 당 1, 2 및 4립), 토양종류(원예상토 단용 및 중화 피트모스와 펄라이트를 3:1 또는 4:1로 혼용), Hyponex[미분(6.5-6-19)] 추비농도(0, 250, 500 및 $1000mg{\cdot}L^{-1}$) 및 차광정도(0, 55 및 75%)를 달리하여 2019년 4월 20일부터 8주 동안 육묘하였다. 연구의 공통사항으로 종자를 $500mg{\cdot}L^{-1}$ $GA_3$에24시간 침지한 다음 원예상토를 충진한 105구 트레이에 셀 당 1립씩 파종하였으며, 이후 2, 4주차에 $500mg{\cdot}L^{-1}$ Hyponex를 엽면시비하였다. 연구의 결과, 파종용기는 셀 당 용적량이 많을수록 초장, 경직경, 엽수, 지상부 및 지하부 생체중이 증가하는 경향이었다. 파종립수에 따른 생육은 1립 파종 시 가장 우수하였으나, 2립 파종한 묘의 개체 당 생체중이 비교적 양호함에 따라 트레이 상 풍성한 볼륨감을 나타내었다. 추비처리의 농도가 증가할수록 유묘의 생육이 증가하는 경향이었으며, $1000mg{\cdot}L^{-1}$ 처리구에서 초장, 경직경, 엽수 및 생체중이 유의적으로 높았다. 한편 차광처리 시 차광정도에 관계없이 경직경, 엽수, 마디수 및 지상부 생체중이 유의적으로 감소하였다. 따라서 정향풀은 용적량이 큰 72구 트레이에 원예상토를 충진한 다음 셀 당 2립씩 파종하여 차광하지 않은 양지에서 Hyponex $1000mg{\cdot}L^{-1}$로 추비하는 것이 관상목적으로 육묘하기 위한 효과적인 재배법으로 판단된다.

• The Journal of the Convergence on Culture Technology
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• v.7 no.3
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• pp.577-582
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• 2021

Recently, with the development of AR, VR, and smart device technologies, the demand for services based on non-face-to-face environments is also increasing in the fitness industry. The non-face-to-face online home training service has the advantage of not being limited by time and place compared to the existing offline service. However, there are disadvantages including the absence of exercise equipment, difficulty in measuring the amount of exercise and chekcing whether the user maintains an accurate exercise posture or not. In this study, we develop a standard exercise program that can compensate for these shortcomings and propose a new non-face-to-face home training application by using a deep learning-based body posture estimation image processing algorithm. This application allows the user to directly watch and follow the trainer of the standard exercise program video, correct the user's own posture, and perform an accurate exercise. Furthermore, if the results of this study are customized according to their purpose, it will be possible to apply them to performances, films, club activities, and conferences

• Journal of Korea Entertainment Industry Association
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• v.15 no.2
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• pp.159-167
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• 2021

The main purpose of this study is to closely investigate the constructive relationship between leisure satisfaction, leisure ability, exercise satisfaction, and consistent motor behavior patterns of the elderly's participation in leisure life sports. In order to achieve this, we surveyed and utilized the sampling of conveniences that selected Yongin and Seongnam city in Gyeonggi-do sports clubs, and accumulated samples of the elderly in living sports. The sample size was 239 elderly people. Based on this, according to the purpose of the study, statistical techniques, spss 23.0, and amos programs were used for analysis. The satisfaction analysis used in the research for a data analysis includes frequency analysis, exploatory factor analysis, confirmatory facor analysis, reliability analysis, correnlation analysis and structure equation model analysis. The research has drawn the following conclusions, based on the above mentioned research method and its procedures: First, it affects the satisfaction of the leisure satisfaction movement. Second, leisure ability affects exercise satisfaction. Third, exercise satisfaction affects the consistent exercise persistence and immersion satisfaction of exercise. As a result, it can be seen that the leisure immersion according to the experience of leisure competence has an effect on the satisfaction of the exercise. As a result, and the continuation of the exercise.

• Journal of Practical Agriculture & Fisheries Research
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• v.6 no.1
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• pp.63-72
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• 2004

This study was conducted to determine the growth and properties of green soybean sprouts(Vigna umbellata Thunb.) in soil culture. Patkong which is a small grain variety was sawn on electric heated hot bed in the greenhouse. Temperature of the culture bed were respectively 17, 20, 25, and 30℃ and water temperature were respectively 14, 17, 20 and 25℃. The kinds of soil used for this study were upland soil, sand, peatmoss and Pearlite, loess, loess and activated carbon. BA was treated in the concentrations of 240 times, 80 times, 40 times besides control. High temperature of 25 and 30℃ increased sprout yield compared to lower temperature but caused to decay from 7 days after sawing. Thus, the most optimum temperature for soil culture was 20℃. The best soil was sand of which increased fresh weight of 850g during same period. Addition of BA was most effective to promote sprout growth in the concentration of 80 times. Compared to general soybean sprouts, green soybean sprouts were 50% higher in fiber but 72% lower in glucide. Vitamin B was 200% higher in green soybean sprouts but vitamin C was higher in general soybean sprouts.

• Journal of Bio-Environment Control
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• v.5 no.2
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• pp.236-247
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• 1996

The main objective of this study was to evaluate the effectiveness of nutrient solutions, substrates, and nutrient solution concentrations in substrate culture of radish(Raphanus sativus L. var. sativus). Cooper's, Hoagland ＆ Arnon' 5, and Yamazaki's solution were used to determine the most suitable nutrient solution in deep flow culture(DFC). In result, Yamazaki's solution treatment showed better results than Hoagland's and Cooper's solution treatments in leaf length, leaf number, shoot and root fresh weights. Cooper's solution was much worse than others. Root shape index were low as 0.6 in all treatments. The selection of suitable was conducted among 14 kinds of substrates which were used commercially, such as sand, perlite and peatmoss, in substrates culture. Sand was the most proper in radish growth and shortened the growth periods. Sand also showed better results then others in leaf length, leaf number, shoot and root fresh weight. On the contrary, radish growth in peatmoss was the worst. Generally, root shape index was higher in substrate than in DFC. In order to investigate the suitable ionic strength in radish, Yamazaki's solution was treated with EC of 0.5, 1.0, 1.5, and 2.0 mS/cm. Generally radish growth above 1.0 mS/cm concentration was good, and the best result was shown in 1.5 mS/cm. Vitamin C contents were not significantly different in the roots of radish grown under 1.0 mS/cm or more. The highest vitamin C content was shown in 0.5 mS/cm, and so was thiocyanate content. Anthocyanin contents increased with the increase of the ionic strength in nutrient solution. Mineral nutrient contents had no significant statistical differences between the treatments, but potassium content was remarkably high in 1.5 mS/cm.

• Asia-pacific Journal of Multimedia Services Convergent with Art, Humanities, and Sociology
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• v.7 no.6
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• pp.681-692
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• 2017

In recent years, large-scale construction projects such as road pavement construction and new city construction have been carried out nationwide with by the expansion of social overhead facilities and base on the economic development planning, resulting in a rapid increase in artificial slope damage. The existing vegetation-based re-installation method of the slope surface greening method reveals various problems such as lack of bonding force, drying, and lack of organic matter. In this study, research was carried out using vegetation-based material and environmentally friendly soil additives, were are used in combination with natural humus, Bark compost, coco peat, and vermiculite. Uniaxial compressive strength was measured according to the mixing ratio of soil additives and the strength was analyzed. Experiments were carried out on the characteristics of the soil material to gauge the slope protection properties by using the soil compaction test method wherein the soil and the soil additive materials are mixed in relation to the soil height, the number of compaction, the compaction method (layer) and the curing condition. As a result of the experiment, excellent strength performance was demonstrated in soil additives using gypsum cement, and it satisfied vegetation growth standards by using performance enhancer and pH regulator. It was confirmed that the strength increases with the mixing of soil and soil additive, and the stability of slope protection can be improved.

• Journal of the Korean Society of Marine Environment & Safety
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• v.30 no.4
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• pp.365-372
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• 2024

The South Korean marine industry is emerging as a significant market, driven by the growing popularity of various water leisure activities, including sailing. This trend suggests a rising demand for sailing yachts. Consequently, since 2022, the design and development of a 28ft sailing yacht have been ongoing, supported by the government and the Ministry of Oceans and Fisheries, to promote yachting culture in South Korea. The Velocity Prediction Program (VPP) analysis was conducted using WinDesign during the preliminary design stage to evaluate performance and determine design parameters. The hydrodynamic model used for this vessel is based on regression methods developed from years of experience in naval architecture and yacht research at the Wolfson Unit, providing reliable estimates for most modern yachts. However, owing to the lack of specific hydrodynamic data from towing tank tests or CFD numerical analysis, verification of the hydrodynamic model has faced some challenges. Additionally, an incomplete weight estimate resulted in variable VCG values, potentially affecting stability and overall performance. The optimal boat speed for this vessel was determined at true wind speeds (TWS) of 4, 8, 12, 16, and 20 knots, using both the jib (up to 120° TWA) and the spinnaker (from 80° TWA). The optimized speed of the yacht was found to be comparable to that of international similar-class yachts.

• Journal of Bio-Environment Control
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• v.27 no.2
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• pp.185-190
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• 2018

This study was conducted to investigate the optimum electrical conductivity (EC) levels of nutrient solution for growth of mother plants and increasing occurrence of daughter plants of strawberry ($Fragaria{\times}ananassa$ Duch. cv. Maehyang) using hydroponics. The mother plants of strawberry were transplanted in cultivation pot ($61{\times}27{\times}18cm$) filled with coir medium on March 22, 2017. Nutrient solution was supplied by the drip tape at $0.6dS{\cdot}m^{-1}$ of EC levels for rooting during 11 days. After rooting, the mother plants of strawberry was treated at the EC levels of 0.6, 1.2 or $1.8dS{\cdot}m^{-1}$, respectively. Growth characteristics, such as mother plants and daughter plants of strawberry were measured at 100 days after transplanting. The plant height of mother plant was significantly higher at $0.6dS{\cdot}m^{-1}$ treatment, and the crown diameter of mother plant was significantly greater at $1.8dS{\cdot}m^{-1}$ treatment. The fresh and dry weights of shoot were higher at both 0.6 and, $1.2dS{\cdot}m^{-1}$ treatments. The number of runners was not significantly different in all treatments. The fresh and dry weights of runner were heavier at $0.6dS{\cdot}m^{-1}$ than other treatments. The number of daughter plants was the highest, 16.7 at the $1.2dS{\cdot}m^{-1}$ treatment. However, the fresh and dry weights of third daughter plant were the heaviest at $0.6dS{\cdot}m^{-1}$ treatment. Although the daughter plants were a large of production at $1.2dS{\cdot}m^{-1}$ treatment, the low EC levels of strawberry were positive in terms of seedling quality during nursery. These results indicated that growth of mother plant and occurrence of daughter plants were greater at the EC $0.6dS{\cdot}m^{-1}$ nutrient solution for hydroponic cultivation of 'Maehyang' strawberry during nursery period.

• Journal of Bio-Environment Control
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• v.27 no.2
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• pp.173-179
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• 2018

Investigation of the optimum levels of pre-plant nitrogen for raising of hot pepper (cv. Nokkwang) plug seedlings was the objective of this research. To achieve this, the pre-plant nitrogen levels were varied to 0, 100, 250, 500, 750, 1,000, and $1,500mg{\cdot}L^{-1}$ and the other essential nutrients were controlled to equal concentrations in all treatments. All the fertilizers were added during the formulation of the mixed medium of coir dust, peatmoss, and perlite with the ratio of 35, 35, and 30% (v/v/v). The root medium containing pre-plant fertilizer was packed into 50-cell plug trays and seeds were sown. The measurement of pH and EC in every week, soil solution analysis for nutrients in week 0, 3, and 7 and growth measurements as well as tissue analysis for nutrient contents in week 7 were conducted. The pHs measured before seed sowing did not show significant differences, but the differences among treatments became significant as seedlings grow bigger. The soil solution ECs were significantly different among treatments in week 0 and these differences were diminished by degrees after week 3, resulting in no significant differences among treatments in week 7. The trends in changes of $NH_4-N$, $NO_3-N$, and other the macro-element concentrations in soil solution of root media were similar to those of ECs. The treatments of 500 and $750mg{\cdot}L^{-1}$ N were more effective than other treatments on seedling growth. The seedling growths in the treatments containing higher N than $1,000mg{\cdot}L^{-1}$ and control were severely suppressed. The elevated pre-plant N concentrations in the root medium resulted in the increase of tissue N contents. The treatments of 500 and $750mg{\cdot}L^{-1}$ N shown the highest seedling growths had 5.13% and 5.31%, respectively, in tissue N contents based on the dry weight of above ground tissue at week 7. The results of this study indicated that the optimum level of pre-plant N is 500 to $750mg{\cdot}L^{-1}$ for the raising of hot pepper plug seedlings.