드론을 활용한 볍씨 정밀 파종기 시작기 제작

이춘구 ( Chun-gu Lee ),최용 ( Yong Choi ),최일수 ( Ilsu Choi ),최덕규 ( Duck-kyu Choi ),우제근 ( Jea-keun Woo ),김영화 ( Younghwa Kim ),문석표 ( Seok Pyo Moon ),이상봉 ( Sangbong Lee ),유승화 ( Seung-hwa Yu ) 한국농업기계학회 2023 한국농업기계학회 학술발표논문집 Vol.28 No.2

벼농사의 경우 일반적으로 육묘 후 논에 모내기를 수행한다. 모내기의 경우 잡초 관리가 쉽고 생산량이 증가하나 이에 따른 추가 노동력과 비용이 소모되는 단점이 있다. 이에 비해 직파의 경우 잡초 관리 및 도복 피해 대책이 필요하나 상대적으로 작업이 간단하다는 장점이 존재한다. 특히 간척지와 같이 대규모 농경지에 파종을 시행하는 경우 드론 등의 비행체를 이용하여 볍씨를 항공 직파하면 작업 효율을 크게 높일 수 있을 것으로 기대된다. 최근 모든 산업 분야에서 활발하게 이용되는 드론의 경우 설정된 범위 내에서 자동 비행이 가능하며 작업기 교체를 통하여 방제, 시비 등 다양한 작업이 가능하여 이를 활용하여 정밀 파종기를 개발하는 경우 농가의 노동력 절감이 가능하고 농업용 드론의 활용성을 증가시킬 수 있을 것으로 기대된다. 이에 따라 볍씨 및 조사료 파종에 활용이 가능한 관행 드론용 입제 살포기를 조사한 결과 종자들이 균일하게 살포 되지 못하는 문제점을 발견하였다. 이에 따라 본 연구에서는 균일 살포 성능을 개선한 정밀 파종기를 설계 및 제작하였다. 우선, 정밀 파종기 시작기는 드론에 탈부착할 수 있으며 종자통과 정밀파종부가 결합된 형태로 설계하였다. 정밀파종부는 종자 공급용 스크류와 파종용 수직 블레이드로 구성하였다. 종자의 연속적인 공급을 위하여 종자통에서 낙하한 종자가 스크류에 올려지면 스크류가 회전하여 전방의 수직블레이드로 이송하도록 하였고, 수직 블레이드에서는 수직방향으로 회전하는 블레이드를 이용하여 종자를 지면으로 낙하시켜 파종하도록 설계하였다. 설계한 도면을 바탕으로 정밀 파종기 시작기를 제작하였다. 모터의 회전속도 제어를 통하여 볍씨의 토출량을 제어하였고, 스크류 모터 제어값이 21% 일 때 볍씨의 토출량은 180g/s이었다. 향후 이를 활용하여 볍씨 및 조사료에 대한 항공직파를 수행하며 그 성능을 분석하고자 한다.

The Prevalence of Facet Tropism and Its Correlation with Low Back Pain in Selected Community-Based Populations

Sangbong Ko,Seung-Bum Chae,Won-Kee Choi,김준영,권재범,도정석 대한정형외과학회 2019 Clinics in Orthopedic Surgery Vol.11 No.2

Background: The incidence of facet tropism (FT) and its correlation with low back pain (LBP) have, to our knowledge, not yet been investigated among selected community-based populations who visited departments unrelated to LBP with their chief complaints unrelated to LBP. In this study, we aimed to evaluate the prevalence of FT among selected patients in whom LBP was not the chief complaint and the correlation between FT and LBP among these patients. Methods: Among patients who underwent computed tomography during 2014 for reasons unrelated to LBP, we enrolled 462 patients who satisfied the inclusion and exclusion criteria. The degree of tropism was defined as grade 0, 1, and 2 for FT, FT+, and FT++, respectively. LBP was evaluated using a modified version of the Nordic low back pain questionnaire. For additional evaluation of dynamic LBP, the question, “Did your pain go away when lying down still or standing up straight, and did it also intensify when you bend or stretch your back?,” was included in the questionnaire. Results: The L4–5 intervertebral area was most frequently and severely affected by FT with an incidence rate of 46.3%, and severe FT was observed in 24.7% of the patients. FT increased with age at L2–3 and L5–S1 levels. FT at L2–3 level was correlated with LBP (p = 0.035) and dynamic LBP (p = 0.033). The FT grade at L2–3 level was correlated with dynamic LBP (p = 0.022) but not with LBP (p = 0.077). The relative risk of FT at L2–3 level was 1.614 for LBP and 1.724 for dynamic LBP. Conclusions: The prevalence of FT among community-based populations was 46.3% and its severe form was more frequently observed at L4–5 level (24.7%). LBP was correlated with FT at L2–3 level. The relative FT-associated risk of LBP was 1.6 at L2–3 level, and the relative L2–3 FT-associated risk of dynamic LBP was 1.724.

Method to reduce an unwanted EM field component in a 4-port TEM cell

Choi, Sungwoong,Jeon, Sangbong,Kim, Dongho,Park, Seong-Ook Institution of Electrical Engineers 2018 Electronics letters Vol.54 No.8

The Investigation of Expansion Plan on the Elementary School's Equestrian Education

Sangbong Park,Sangeun Choi 한국아세아태평양교육문화융복합학회 2021 Asia Pacific Journal of Teaching and Learning Vol.1 No.2

Purpose In order to realize the various values of horseback riding in elementary school education, investigating the policy of horseback riding, the function and competency aspects of physical education, and the educational feasibilities of equestrian education from an integrated perspective. Method Analyze the policy about expansion of equestrian education, Analysis from the perspective of competency and functional improvement which are the major part of the physical education in Korea and an integrated viewpoint which is a characteristic of elementary school education. Results The regulation about use of the riding equipment and the equestrian education safety rules should be established. And in the case of big cities, it is necessary to use horseback riding machines instead of riding a horse. Horseback riding can give the positive effect to students. horseback riding is the good material of the leisure activities and helpful to cultivate the self-directed health management ability, the training ability which sustains physical and mental training and the aesthetic emotional competency such as experiencing beauty while working with horses. Also horseback riding can increase the educational effect through direct physical activity and various in-directed experience activities like reading, writing, searching, appreciating, etc. Conclusion Considering recent innovative changing of science technology and the education, applying the new scientific technology to the horseback riding is the good chance to overcome the educational limitation like visiting horseback riding course at a long distance, falling while horseback riding, restricting horseback riding opportunities, and etc. And following-up studies are needed how to apply the new scientific technology to equestrian education more specifically and how to establish the application environment to develop the program for this.

Distances between Rats in Reverberation Chambers Used for Large-Scale Experiments

Sangbong Jeon,Wook Jang,Ae-Kyoung Lee,Hyung-Do Choi,Jeong-Ki Pack,Jianqing Wang,Dongho Kim 한국전자파학회JEES 2021 Journal of Electromagnetic Engineering and Science Vol.21 No.2

We investigate the whole-body average specific absorption rate (WBA-SAR) of rats under various plane wave exposure characteristics, including different polarizations, incidence angles, distances between rats, and total number of rats. Unlike many other studies, we start our SAR analysis from one rat and expand it to 27 rats facing random directions in a three-dimensional area. In a one-rat analysis, we examine how the incidence direction and polarization affect the SAR of a single rat. Moreover, we look into how various incidence polarizations behave differently after they are transmited through a rat, the information of which is then used to analyze the effect of spacing among 27 randomly arranged rats. Next, we analyze the effect on spacing of the 27 rats deployed under a 52-plane-wave exposure, which is introduced to mimic a realistic reverberation chamber (RC) environment. We show the deviation in WBA-SAR according to the distance between rats, which provides guidelines for selecting the appropriate rat distance based on the number of animals and the exposure deviation within a limited working volume in an RC for large-scale experiments.

2D WPS System for Measuring the Location Changes in Real Time of PAL-XFEL Devices

Choi, Hyojin,Lee, Sangbong,Lee, Hong-Gi,Back, SoungYoul,Kim, Seunghwan,Kang, Heung-Sik 한국물리학회 2018 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol. No.

Effects of treatment of temporomandibular disorders on headache, quality of life, and neck function in patients with tension-type headaches: a randomized controlled study

Choi, Wonjae,Woo, Jungmuk,Lee, Sangbong,Lee, Seungwon korean Academy of Physical Therapy Rehabilitation 2020 Physical therapy rehabilitation science Vol.9 No.4

Objective: Tension-type headaches usually occur with temporomandibular disorder, which increases the risk of the chronic tension-type headaches. This study was conducted to investigate the effect of additional temporalmandibular therapy compared to cerivcal joint therapy for tension-type headaches with pericranial tenderness. Design: Randomized controlled trial. Methods: Forty-one patients with chronic tension-type headaches and pericranial tenderness were randomized into the 3 groups, such as the temporomandibular joint therapy group (TMJT group, n=14), cervical manual therapy group (CMT group, n=14) and conservative therapy group (CT group, n=13). All patients were assessed at baseline and after each intervention during the three sessions. The participants in the TMJT group received the temporomadibular joint treatment and cervical manual therapy for 30 minutes, once a week, for 3 weeks. The participants in the CMT group received the cervical manual therapy, and those in the CT group received modalities during same time period. The outcome measurements used were the intensity of headaches measured on the Visual Analogue Scale (VAS), quality of life measured with the Headache Impact Test (HIT-6), and function of the cervical spine using the Neck Diability Index (NDI). Results: The TMJT group that received temporomandibular joint treatment and cervical manual therapy showed a significant decrease in VAS, HIT-6, and NDI compared with the other 2 groups (p<0.05). Conclusions: This study suggected that temporomandibular joint treatment combined with cervical manual therapy was more effective for the chronic tension-type headaches with pericranial tenderness than the usual cervical therapy alone.

서울지역 중학교 기술 교사가 인식하는 기술 교과 교육 목표와 교육과정 내용의 중요도

최운묵,이상봉,장재성 한국기술교육학회 2001 한국기술교육학회지 Vol.1 No.2

The purposes of this study were to identify the significance level of goals and curriculum contents of technology education subject as perceived by the technology teachers of middle schools in Seoul. The data were collected by questionnaires from 90 middle schools, analyzed by SPSSWIN 10.0 program. The major findings of this study were as follows: ① Level agreed of technology education goals were shown 3.78 as a whole, and the highest level of agreed goals were to understand the social development owing to development of technology. ② As a whole, the highest significance level of goals were to have quest experiences for their technology related career and self-discovery and to improve abilities to apply lots of information in selecting career. ③ The level agreed in curriculum contents were shown 3.69, and the highest level agreed in contents were to have knowledge about the advanced technology influences upon human race, environments, and civilization. ④ The highest significance level technology teachers consider the knowledge about the advanced technology influences upon human race, environments, and civilization as the most provision among lots of education contents. On the contrary, according to teachers majors, the significance levels of the technology courses goals and the education contents were shown differently, namely, the teachers who majored in technology, the teachers who studied technology as a minor or majored in different subjects have different views on the technology study respectively.

Effect of Polyacrylamide on Seedling Stage Growth of Cereal Crops Cultivated in Reclaimed Soils

Sangbong Lee,Minyoung Kim,Youngjin Kim,Heetae Kim,Sanghyeon Kang,Yonghun Choi 한국토양비료학회 2021 한국토양비료학회지 Vol.54 No.4

This study was conducted to investigate the effect of Polyacrylamide (PAM) on the seedling stage growth of cereal crops, soybean, maize, and barley, which are widely grown in reclaimed agricultural lands. A series of experiments were carried out using five different PAM products (A, B, C, D, E) and their various concentrations (10, 20, 30, 50, 100 mg L<SUP>-1</SUP>). The standardized soil pots were filled with soils collected from reclaimed lands (soybean, maize: 250 g, barley: 150 g), and three crops were planted. Each PAM solutions with different concentrations were sprayed onto the soil surface of 1.0 mm thickness. After initial full irrigation, timely-dependent amount of water was irrigated to maintain the total weight of the pots. Cereal crops were cultivated for 21 days and then compared their plant lengths and fresh weights to assess the effect of PAM. Plant lengths and weights from untreated and PAM-treated pots were not significantly different (a = 0.05). In addition, different PAM products did not also show any effects on crop growth. However, plant lengths and weights of soybean and barley from the experimental plots with different PAM concentrations showed their differences in certain levels (a = 0.05), which indicating the possibility of growth effect with PAM treatment.

고분자응집제 처리에 따른 간척지 토양의 비산먼지 발생 저감 효과

이상봉 ( Sangbong Lee ),김영진 ( Youngjin Kim ),최용훈 ( Yonghun Choi ),김민영 ( Minyoung Kim ),김희태 ( Heetae Kim ) 한국농공학회 2020 한국농공학회 학술대회초록집 Vol.2020 No.-

고분자응집제(Polyacrylamide)는 강력한 흡착관능기를 가지는 유기화합물로 미세입자를 결합시키는 능력이 있다. 이러한 특성을 이용하여 상하수도처리, 비산먼지 방지, 접착제 및 포장재 등 다양한 산업분야에서 폭 넓게 사용하고 있으며, 농업분야의 경우 토양 물리성 개량, 토양유실 저감을 통한 농지기반 보호 등에 사용되고 있다. 본 연구에서는 국내에서 제조 또는 유통 중인 고분자응집제(천연고분자계 5종, 합성고분자계 5종) 중 Jar-test를 통해 선발한 응집능력이 우수한 2종류(D, R)의 응집제에 대해 간척지 토양의 표면에 처리 한 후 비산먼지 발생저감 효과를 풍동시험으로 평가하였다. 풍동시험은 농촌진흥청 내에 설치되어 있는 개방형 아음속 경계층 풍동(L×B×H : 34×3×2m, 시험부 15m)에서 실시하였다. 풍동 내에 새만금 간척지에서 샘플링한 토양(Loamy Sand)을 일정 크기(50cm×50cm×2cm)의 고정 패드에 충진하고 고분자응집제(50ppm)의 표면 살포량(0.1, 0.5, 1.0mm)과 풍속을 변화(4∼12m/s)시키면서 시험 전후의 토양시료 무게 변화로 비산먼지 발생량을 측정하였다. 최대 풍속 값은 해당 토양을 샘플링한 지역의 최근 3년간 최대 풍속기록을 참조하여 설정하였으며 풍속별 지속시간은 5분으로 설정하였다. 실험 결과, 비산먼지 발생량은 D, R 모두 풍속이 증가할수록 늘어나고 표면 살포량이 증가할수록 감소하는 경향을 보였다. 최대풍속(12m/s)에서 살포량이 1.0mm와 0.5mm 일 때 D의 비산량은 각각 초기 시료무게의 0.18%, 0.28%, R의 경우 각각 0.20%, 0.33%로 2종류 모두 우수한 효과를 보였다. 또한 동일조건에서의 비산량은 풍속이 낮아질수록 근소한 차를 보였다. 한편 살포량이 0.1mm인 경우는 최대풍속의 비산량이 40∼41%로 나타나 무처리 42%에 비해 비산방지 효과가 크기 않는 것으로 나타났다. 금후 추가적인 시험을 통해 간척지토양의 비산방지를 위한 고분자응집제의 현장 적용성을 높여 나갈 계획이다.