• Proceedings of the Korea Water Resources Association Conference
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• 2016.05a
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• pp.463-463
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• 2016

최근 도시물순환 복원 및 치 이수효과 증대를 위해 저영향개발기법(Low Impact Development) 연구가 활발하게 진행 중이다. 하지만 대부분이 수치모델을 활용한 설계프로그램 개발에 대한 연구에 집중되어 있는 실정이며, 이러한 프로그램을 활용한 설계 시 최적의 매개변수 결정에 한계가 있다. 이러한 이유로 본 연구에서는 건축형 LID 요소 중 하나인 식생여과장치(Planter Box)의 모형실험을 통해 프로그램 모의에 필요한 매개변수를 추정하고, 모의를 수행한 후 모형실험 결과와 프로그램 모의 결과를 비교하여 최종적으로 식생여과장치의 설계 매개변수를 산정하고자 한다. 식생여과장치의 모형실험을 위하여 가로 1.5m, 세로 1.5m, 높이 1.5m로 실험 장치를 제작하였으며, 강우-유출수 실험 전 시료의 침투율, 함수비 등을 체크한 후 지속시간 1시간의 재현빈도 5년, 10년, 20년, 50년에 해당하는 강우강도에 대해 실험을 수행하였다. 실험결과로 나타난 자료는 SWMM 모형과 비교분석해 모형에 적용된 매개변수의 적합성을 분석하였으며, 재현빈도 5년, 10년, 20년의 경우 $R^2$ 값이 0.88~0.97로 실험 값과 모의 값의 연관성이 높게 나타났으며, 재현 빈도 50년의 경우 0.7835로 비교적 연관성이 낮게 나타났다.

• Korean Journal of Applied Biomechanics
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• v.22 no.2
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• pp.141-150
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• 2012

This study aims to provide the basic biomechanical data on the average, maximum and distribution of plantar pressure during hockey penalty stroke by comparing five skilled and five unskilled players. Following are the conclusions. First in the case of average and maximum planter pressure during penalty stroke, the skilled players showed higher pressures at the moment of left foot landing in rear plantar of left foot and fore, rear plantar of right foot compared to the unskilled players. Also at the moment of impact, the skilled players showed higher pressures in fore, rear plantar of left foot and fore plantar of right foot compared to the unskilled. The analysis drew the conclusion that the skilled players move their center of body from fore, rear plantar of right foot to fore, rear plantar of left foot at the moment of left foot landing and impact in order to perform a quick and strong shooting. Second in the case of plantar distribution, as the skilled players put over 70% of their weights on left foot, they showed overall higher plantar pressure distributed on the outer fore, mid and rear parts of left foot plantar, in contrast with the unskilled players who showed about 50/50 distribution of weights on their right and left foot. The analysis concluded that such distribution was shown because the skilled players transferred their weights from the right to left foot effectively while the unskilled players could not do so.

• Journal of Life Science
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• v.13 no.4
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• pp.428-432
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• 2003

This study was carried out to develop and investigate integrated mechanization system for culture of carrot. Compared with the conventional hand planting, use of a mechanical planter for pelleted seeds resulted in a saving of planting time by 225 hours. An additional saving of 460 hours was obtained for thinning the seedlings. Besides seeds could be saved by 72%, planting and thinning be done only in 35 hours per ha field when the pelleted seeds were planted with a planter. Work hour reduced by adopting the mechanical planting of pelleted seeds sharply contrasted to that of 720 hours required for hand-planting the thinning hours, resulting in a reduction of labor by more than 95%. SMP followed pelleting tended not only to increase the percentage of seedling emergence in the field but to induce an a day earlier germination.

• Journal of Wetlands Research
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• v.21 no.4
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• pp.384-391
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• 2019

Nutrients in stormwater runoff have raised concerns regarding water quality degradation in the recent years. Low impact development (LID) technologies are types of nature-based solutions developed to address water quality problems and restore the predevelopment hydrology of a catchment area. Two LID facilities, infiltration trench (IT) and infiltration planter (IP), are known for their high removal rate of nutrients through sedimentation and vegetation. Long-term monitoring was conducted to assess the performance and cite the advantages and disadvantages of utilizing the facilities in nutrient removal. Since a strong ionic bond exists between phosphorus compounds and sediments, reduction of total phosphorus (TP) (more than 76%), in both facilities was associated to the removal of total suspended solids (TSS) (more than 84%). The efficiency of nitrogen in IP is 28% higher than IT. Effective nitrification occurred in IT and particulate forms of nitrogen were removed through sedimentation and media filters. Decrease in ammonium- nitrogen (NH₄-N) and nitrite-nitrogen (NO₂-N), and increase in nitrate-nitrogen (NO₃-N) fraction forms indicated that effective nitrification and denitrification occurred in IP. Hydrologic factors such as rainfall depth and rainfall intensity affected nutrient treatment capabilities of urban stormwater LID facilities The greatest monitored rainfall intensity of 11 mm/hr for IT yielded to 34% and 55% removal efficiencies for TN and TP, respectively, whereas, low rainfall intensities below 5 mm resulted to 100 % removal efficiency. The greatest monitored rainfall intensity for IP was 27 mm/hr, which still resulted to high removal efficiencies of 98% and 97% for TN and TP, respectively. Water quality assessment showed that both facilities were effective in reducing the amount of nutrients; however, IP was found to be more efficient than IT due to its additional provisions for plant uptake and larger storage volume.

• Proceedings of the Korean Society for Agricultural Machinery Conference
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• 2017.04a
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• pp.92-92
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• 2017

밭작물 중 마늘 재배를 위한 노동력 투입시간은 2016년 기준 10a 당 126.9시간 이었고, 파종정식의 기계화율은 2015년 기준 15.1%로 조사된다. 이는 마늘 재배에 있어서 파종정식의 기계화가 노동력 절감을 위해 필요하다는 것을 보여준다. 현재의 우리나라 마늘 파종기는 점파식으로 개발, 판매되고 있는데 집개 방식 또는 버킷 방식은 파종 속도를 올리면 파종율이 떨어지기 때문에 파종 속도를 향상시키는데 한계가 있있다. 본 연구에서는 이를 보완하기 위하여 콩, 옥수수 등의 종자에 사용되는 진공식 파종 기술을 마늘에 적용하였다. 마늘의 경우 형상이 비대칭형에다가 종구별 크기, 모양, 무게가 조금씩 다르기 때문에 이론적으로 흡입구를 설계하는 어려움이 있다. 따라서 진공흡입구의 지름과 재질을 파라메터로 하여 변화를 주고 실험을 통하여 배종률 결과의 차이를 확인하였다. 그 결과 경도 $10{\pm}2$의 실리콘 재질에 지름 14mm이상에서 90%이상의 높은 배종률을 보여주었다.

• Proceedings of the Korean Society for Agricultural Machinery Conference
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• 1996.06c
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• pp.469-477
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• 1996

In order to maintain a constant ratio between the ground wheel and fed shaft of planters, a feedback control unit was designed to drive the feed shaft in proportional to the ground speed. The fifth wheel was used as a ground speed sensor for the control unit. Using this control unit a feed shaft driving system was developed and tested both in the laboratory and field to evaluate it performance . The test results showed that the system drove the feed shaft in proportional to the ground speed in the normal planting speed range of 0.5 -0.8m/s with an error of less than 5%.

• Journal of Biosystems Engineering
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• v.22 no.4
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• pp.401-410
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• 1997

Scattering of seeds is one of the problems in the hill- dropping planters with a roller-type metering device. For crops like rice, corns and beans, the hill-dropping is own better for a high yield than the drill planting. The roller type metering device has been used for the drill planters and has many advantages. However, it has a problem of scattering of seeds when they are placed on rows. In this study a method was developed to design the roller type metering device fir the precision hill-droppings. Design parameters were derived to configure completely the geometries of the roller and brush. The method was applied to the design of the metering device of the rice seeding machines. The field test showed that the metering device designed by the method made a better performance of seed placement than that made by the precvious one. The method also can be applied to the design of metering devices for the precise hill-droppings of other crops.

• Journal of the Korea Furniture Society
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• v.20 no.6
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• pp.581-589
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• 2009

Under 'The Design Street' Project, one of the urban environment improvement projects of Seoul, the facilities on the street have been greatly varied in terms of design. In addition, the municipal authority has pushed each district to develop its own identity based on the integrated design of the city. This study was aimed to propose a design which could solve the current problem in street furniture in terms of environmental improvement through an analysis on current street conditions in "Y" District as a part of Seoul Design Street Project. It has attempted to propose 11 street furnitures based on the basic strategy of 'Soft City' which has been promoted by Seoul City in accordance with the Seoul Public Facility Guidelines as 1. Airy Design, 2. Integrated Design, 3. Collaborative Design and 4. Sustainable Design. Among them, for the total design in Seoul six facilities - kiosk, manhole, traffic signal controller, public phone, road sign and waste receptacle were proposed by Seoul City have been accepted. For local differentiation, on the contrary, five items - planter bench, bollard, lifter, bike rack and fence have been newly designed and proposed. Furthermore, it is essential to carry out systematic supervision and continuous management on the detail design and construction of current regional design development projects.

• The Journal of Korean Physical Therapy
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• v.32 no.1
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• pp.29-33
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• 2020

Purpose: This study examined the effects of the weight-bearing pattern and calcaneal taping on the heel width and plantar pressure in standing. Methods: Fifteen healthy subjects with normal feet participated in this study. The heel width was measured using a digital caliper, and a pedoscan was used to measure the plantar pressure of the rear foot while standing. The participants were instructed to stand in three weight-bearing patterns (anterior, middle, and posterior weight bearing) before and after calcaneal taping. The heel width and plantar pressure were measured three times before and three times after calcaneal taping, with the three weight-bearing patterns applied in random order. A 2 (non-taping vs. taping) × 3 (anterior, middle, posterior weight bearing) two-way repeated ANOVA with a Bonferroni post hoc correction was used to assess the differences in heel width and plantar pressure. Results: The results revealed a significant main effect of the weight-bearing pattern (p<.01), but not of calcaneal taping (p>.05). Greater weight bearing applied to the heel resulted in a significantly increased heel width and planter pressure of the rear foot (p<.01). Conclusion: In standing, a posterior weight-bearing pattern increases the heel width due to side-to-side shifting of the plantar heel pad, which increases the heel plantar pressure. Therefore, to prevent high stress on the heel pad and plantar heel pain, it is important to refrain from posterior weight bearing while standing during the activities of daily living.

• Agricultural and Biosystems Engineering
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• v.5 no.2
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• pp.45-49
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• 2004

Objective of the study was to develop a garlic clove metering device. The metering device consisted of a drum, a bucket and a bucket cover. A garlic clove simulator was designed to simulate motions of garlic cloves in the metering device. Simulation was performed using a multibody dynamic analysis program, RecurDyn version 5.1. Physical properties of garlic cloves such as mass and center of gravity were determined using 3D CAD modeler, IDEAS version 10.0. In order to compare the results of the simulation with actual movement of a garlic, movement of garlic clove was photographed by a high speed camera. A prototype metering device was built and tested under various metering speeds and metering guide angles. At the 12 rpm metering speed, rate of single-clove-discharge was $90.0\%$ and missing rate $1.3\%$ at $5^{\circ}$.