• The Bulletin of The Korean Astronomical Society
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• v.45 no.1
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• pp.52.3-52.3
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• 2020

천문학적 유체는 강하게 자화되어 있는 경우가 많은데, 이러한 강한 자기장을 얻는 한 방법이 난류에 의한 자기장의 증폭이다. 플라즈마 효과나 기타의 이유로 약한 씨앗 자기장이 유체에 생길 경우, 난류는 이 씨앗 자기장을 매우 효과적으로 증폭시킬 수가 있다. 이 과정을 난류 다이너모라 하는데, 난류 다이너모는 주로 비압축성 난류 구동력을 사용하여 연구해 오고 있다. 비압축성 구동력을 사용할 때의 난류 다이너모 과정은 비교적 잘 규명되어 있다. 기존의 연구 결과에 의하면, 자기장의 세기는 지수 함수적 성장을 거친 후 선형적 성장 단계를 겪는다. 이후, 자기장의 에너지 밀도가 난류의 에너지 밀도와 비슷해지면 자기장은 더 이상 성장하지 못하고 포화 상태에 접어든다. 결론적으로 난류는 자기장이 동력학적으로 중요한 수준까지 증폭을 시킬 수 있다. 압축성 난류 구동력을 사용한 난류 다이너모 연구도 일부 존재하는데, 기존의 연구 결과에 의하면 다이너모 효과가 비압축성 구동력의 경우보다 비효율적이다. 본 연구에서는 압축성 구동력을 사용하여 난류 다이너모를 체계적으로 연구하였다. 특히 압축성 구동력과 비압축성 구동력이 난류 다이너모 효과에 어떤 차이를 주는지 체계적으로 비교하였다.

• Journal of Korean Society of Forest Science
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• v.104 no.3
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• pp.352-359
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• 2015

This study was conducted to evaluate how the special protection area designations of degraded trails effect on the soil and vegetation recovery of degraded trails. The study areas were established on an opened trail and a 16-year closed trail, which was prohibited to enter after the designation as a special protection area for recovery, at Bukhansan National Park. Soil core sampling and measurements of vegetation cover were performed to compare soil and vegetation properties of the trails. Soil bulk density increased and soil water total nitrogen decreased on the opened trail, while no significant differences were found on bulk density, soil water, total nitrogen, acidity, and organic matter on the closed trail. On the opened trail, vegetation cover was seemed to be degraded, because vegetation litter cover ratio was low and barren rock cover ratio was high. On the closed trail, litter rock barren cover ratio of the closed trail was recovered, but only limited recovery was found on vegetation cover by applying environmental damage condition rating class. In conclusion, the closed trail was recovered by designation of special protection area, while difference in recovery progress of soil and vegetation was found. Therefore, designation of special protection area of degraded area should be based on scientific basis of recovery characteristics of the area. In order to improve the effectiveness of special protection area system, further specific standards for special protection area designation and management would be needed, considering ecological and social importance of target areas.

• Journal of the Korean Association of Geographic Information Studies
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• v.26 no.4
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• pp.237-250
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• 2023

Orthophotos and DEMs were generated by UAV-based aerial photogrammetry and an attempt was made to apply them to detailed investigations for the production of flood traces. The cultivated area located in Goa-eup, Gumi, where the embankment collapsed and inundated inundation occurred due to the impact of 6th Typhoon Sanba in 2012, was selected as rhe target area. To obtain optimal accuracy of UAV photogrammetry performance, the UAV images were taken under the optimal placement of 19 GCPs and then point cloud, DEM, and orthoimages were generated through image processing using Pix4Dmapper software. After applying CloudCompare's CSF Filtering to separate the point cloud into ground elements and non-ground elements, a finally corrected DEM was created using only non-ground elements in GRASS GIS software. The flood level and flood depth data extracted from the final generated DEM were compared and presented with the flood level and flood depth data from existing data as of 2012 provided through the public data portal site of the Korea Land and Geospatial Informatix Corporation(LX).

• Current Research on Agriculture and Life Sciences
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• v.5
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• pp.106-111
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• 1987

The susceptibility of 8 chrysanthemum varieties to Apelenchoides ritzemabosi, Shuhonothikara and Sagakiku were resistant by 11.7% and 14.5% each infested leaf, Sinrokusiogio, Dangonanako and Sintoa were susceptible as above 50%, Gold wave and Tenju were modertae by 24 to 26%. Percentage of infested leaf was positively correlated with the number of epidermal hair but not with leaf area, leaf thickness, stomatal size, number of stomata and length of epidermal hair. In effect of watering method, Polyethylene film cover plot was lowest by 9.4%, next conventional watering plot by 50%, Conventional watering and spray plot was the highest by 62%. The infested leaf rate was closely related with a number of rainy days than the amount of rainfall. Effect of chemical soil treatment, Temik showed the lowest infested leaf rate by 5%. There was no significant difference between the chemicals except Temik, but these are markedly effective in compare to control.

• Physical Therapy Korea
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• v.7 no.4
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• pp.39-46
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• 2000

본 연구는 강직성 편측 뇌성마비 환자의 보행 기시(gait initiation)의 특성을 파악하고, 동적 단하지 보조기(dynamic ankle foot orthosis : DAFO)가 이런 환자들의 보행 기시에 미치는 영향을 알아보기 위하여 실시하였다. 연구대상자는 19세 선천성 강직성 우측 뇌성마비를 가진 여자 대학생이었다. 연구대상자는 4개의 다른 보행 기시 조건에서 각 조건당 7회의 보행 기시를 하였는데, 각각의 보행 기시 조건은: 1) 보조기 없이 좌측 하지로 보행 기시; 2) 우측 하지 보조기 착용 상태에서 좌측하지로 보행 기시; 3) 보조기 없이 우측 하지로 보행 기시; 4) 우측 하지 보조기 착용 상태에서 우측 하지로 보행 기시였다. 두개의 힘 판(force plate) 위에서 본인이 선택한 가장 편안한 방법과 속도로 2 m를 걷도록 하였다. 연구대상자가 보행 기시를 하는 동안 양쪽 가자미근과 앞정강근에 부착된 4개의 표면 전극으로부터 근 전도 신호와 보행 기시를 하는 연구 대상의 양 발 아래 놓인 두개의 힘 판의 자료를 분석하여 체중(body weight : BW)으로 정량화 하였다. 실험결과는 각 조건마다 7회 실시된 측정값들의 평균을 이용하였다. 본 사전연구의 결과는 다음과 같다. 1. 보행 기시 전 양다리로 선 상태에서 환측보다 건측으로 많은 체중지지를 하였으나(환측 42.57%BW, 건측 58.03%BW) 보조기의 착용이 환측으로의 체중지지를 향상시켰다(환측 44.46%BW, 건측 55.54%BW). 2. 보행 기시 중 가자미근과 앞정강근의 동시수축(coactivation)이 계속되었는데 이러한 양상은 보조기의 착용 유무에 따라 크게 달라지지 않았다. 3. 힘 판에서 들어온 지면 반발력(ground reaction force)의 수직 분력(vertical element, Fz)과 전후 분력(anterior-posterior element, Fx)을 분석한 결과, 건측 다리로 보행 기시를 할 때 보조기 착용은 가속을 촉진시켜 역학적으로 유리하였다. 이상의 연구 결과는 보조기의 착용이 건측 다리로 보행 기시를 할 때 미치는 신경학적, 역학적 장점들에 대한 구체적 연구의 필요성 및 근거를 제시하고, 환자들의 보행훈련 접근에 보다 효율적인 보행방법을 소개하는데 이용될 수 있다.

• The Journal of the Convergence on Culture Technology
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• v.6 no.4
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• pp.825-831
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• 2020

In modern society, automobiles have become an essential means of transportation. It is the only consumable that is worn by contacting the ground among automobile parts. If the tyres are severely worn, the tyres may be break, presenting a risk of a serious accident to the driver. To avoid this risk, drivers should check tyre pressure and tread condition before driving a car. Tyre inflation pressure can be easily measured by TPMS, but in the case of tyre tread conditions, it can be cumbersome when the driver measures it directly using a coin or vernier caliper. This hassle can expose the driver to traffic accidents due to tyre breakage by neglecting to measure the condition of the tyre tread. In this paper, we introduce the contents of research to design an IoT service-based system that can automatically measure automobile tyres, and we verified the possibility of realizing the system by actually implementing and testing some components of the system.

• Korean Journal of Heritage: History & Science
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• v.56 no.4
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• pp.192-214
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• 2023

Wooden architectural cultural heritages are one of the visible legacies that show the national's identity. Even when the concept of 'the original' of cultural heritages was not accurately understood, the emphasis of preservation and management of cultural heritages was placed on 'preservation of the original form' or 'maintenance of the original form'. Moreover, these days, following the trend of international preservation principles, cultural heritages are considered important as "values as historical objects." This paper is the result of an attempt to determine the scope and content of what parts should be monitored to maintain the original form of wooden architectural cultural heritage. The first thing to be done in monitoring wooden architectural cultural heritage is to check the condition of the ground and foundation. The second is the column. This is because the instability of the column causes damage to the joint with each member and the fitting part, resulting in physical changes leading to damage to the wall. The third is monitor the roof tiles. If the leak continues into the building due to the separation or damage of the roof, the defect should be partially dismantled and repaired, so it should be monitored to maintain its original shape as much as possible. The monitoring range of the base, column, and roof serves as a reference point for identifying what damage is being done to the relevant cultural heritages. In other words, the data at the time when monitoring began becomes the 'original' for the year. Alternatives based on the analysis of monitoring for the preservation of original cultural heritages should be actively introduced. In addition, by sharing the current state and situation of cultural heritages as a result of monitoring with various related organizations, preventive preservation should be established rather than preservation of cultural heritages by "intervention."

• Journal of rehabilitation welfare engineering & assistive technology
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• v.2 no.1
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• pp.19-25
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• 2009

Pes planus is a condition where the arch of the foot collapses and comes in contact with the ground. The purpose of study was to confirm the effect of a patient-customized insole on both feet velocity of pes planus with and without the insole, in order to establish both feet velocity as a rehabilitation evaluation factor of pes planus in future. As a result, the average velocity shifts of both feet showed that left foot is 2.96%, right foot is 1.09% via gait experiment with 13 pes planus patients with and without insole. Therefore this study verified that the patient-customized insole effects on both feet velocity of pes planus. However further study needs to demonstrate both feet velocity as a rehabilitation evaluation factor in pes planus.

• Journal of the Korean Institute of Intelligent Systems
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• v.24 no.4
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• pp.450-456
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• 2014

Humanoid robot is the most suitable robot platform for effective human and robot interaction. However, the robot's complicated body structure containing more than twenty joint actuators makes it difficult to generate stable and elaborate postures using the conventional inverse kinematic method. This paper proposes an alternative approach to generate difficult postures of touching an object placed in front of the foot by the left or right hand with its torso bent forward in single support phase using the fast computational optimization method, particle swarm optimization. The simulated postures are also applied to a commercial humanoid robot platform, which validates the feasibility of the proposed approach.

• Research in Community and Public Health Nursing
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• v.5 no.2
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• pp.227-235
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• 1994

본 프로젝트는 1993년 6월부터 9월까지 태국의 International Community Maternal and Child Health Nursing Training Program에서 이루어진 것으로 17개국 참석자 중 8개국 참가자들이 태국의 권케지역(태국 북동부)중 한 농촌지역을 택해 1개월간의 가정방문과 Group Work을 통해 지역사회 진단후 진단내용을 근거로 사업계획을 시행한 것이다. 조사지역 -Ban Nang Loob Village-은 우리나라의 일차보건의료를 수행하는 가장 말단지역인 이(里)에 해당하며, 이 중 5세 미만의 영유아가 있는 어머니들을 조사대상으로 하였다. 조사가구는 75가구였으며, 자료수집도구는 일반적인 특성, 환경상태, 지역사회 조직, 모자보건에 대한 지식, 태도, 실천과 관련된 내용으로 총 52개 문항이었다. 자료수집은 면접과 관찰을 통해 이루어졌으며 면접은 통역을 위해 태국 권켄대학의 간호대학 교수들과 함께 시행하였다. 본인이 참석한 그룹에서는 모자보건사업 중 모성건강에 관한 조사만 이루어졌으므로 이 지면에 소개된 프로젝트는 모성건강문제에 국한된다. 본 조사에서는 3가지 모성 건강과 관련된 문제가 나타났는데 이를 문제의 정도, 심각성, 예방가능성, 지역사회의 관심정도로 점수화하여 총계를 낸 후, 가장 커다란 문제점으로 '모성의 임신과 산욕기 동안의 합병증에 대한 지식부족'이 제기되어 이를 기초로 Master Plan, Operational Plan, Time Frame, Budget이 제시되었다. 본 프로젝트에서 제시된 사업계획은 담당지역의 Health Center, 권켄 간호대학, 지역사회 주민조직의 협조로 지역주민의 모자보건사업 활성화를 위해 실제로 시행될 계획이다.