ICT 기반의 인삼 공정 육묘 시 상토에 따른 발아 특성

김동현,김연복,구현정,백현진,이수빈,홍의기,김상기,장광진,Kim, D.H.,Kim, Y.B.,Koo, H.J.,Baek, H.J.,Lee, S.B.,Hong, E.K.,Kim, S.K.,Chang, K.J. 국립한국농수산대학교 교육개발센터 2021 현장농수산연구지 Vol.23 No.2

As a result of examining the germination rate between ginseng varieties, Jagyongjong varieties had the highest germination rate, and Yeonpung. had the lowest germination rate. In the ginseng seed germination rate experiment, the highest germination rate and growth condition were shown in artificial soil conditions of the ratio of Peatmoss 6.5: Pearlite 2: Masato 1.5. Good soil conditions require adequate soil moisture forces during the incubation period. The cultivation of ginseng medicinal crops requires optimal soil breathability, soil pH, and soil stabilization, which are important for root breathing. Microbial activity in the soil has a great influence on the growth of ginseng. The optimum pH of the soil for ginseng cultivation is 5.0-5.5 As a result of the experiment, the soil remained in an appropriate range after a month. In general, when the EC concentration value of the soil for ginseng cultivation is 0.2 mS/cm or more, growth deteriorates, and when the EC concentration value is 0.5 mS/cm or more, concentration obstacles such as root decay occur. As a result of the analysis, the higher the concentration value of EC, the more likely it is to interfere with ginseng growth.

옥총(玉葱) 첨가 조청의 제조 및 특성

김동현,김연복,구현정,백현진,장광진,Kim, D.H.,Kim, Y.B.,Koo, H.J.,Baek, H.J.,Chang, K.J. 국립한국농수산대학교 교육개발센터 2020 현장농수산연구지 Vol.22 No.1

Onion is a perennial herb of the lily family that has a long history and has long been widely used throughout the world as it is one of the most important condiments in our diet, along with chili peppers and garlic. It has been used for cooking and processing food with its unique flavor and aroma. Because of the nature of onions, long-term storage can lead to spoilage. Research was done to increase profits through processing and expand various onion products. A low temperature extraction method was used to study the physiological activation effect and onion processing method of flavonoid component weak to heat.

인삼, 숙부자, 생강, 감초의 배합에 의한 세포독성 평가

김동현,김연복,구현정,백현진,이수빈,장광진,Kim, D.H.,Kim, Y.B.,Koo, H.J.,Baek, H.J.,Lee, S.B.,Chang, K.J. 국립한국농수산대학교 교육개발센터 2021 현장농수산연구지 Vol.23 No.1

Cytotoxicity was evaluated in A549 lung cancer cells and RAW264.7 macrophage cells with processed aconitum, ginseng, ginger and licorice extracts. The first experiment began to affect toxicity from 100 ㎍/ml concentrations in extracts mixed with processed aconitum and ginseng. Cytotoxicity began at 1000 ㎍/ml concentrations in the second experimental extract with additional ginger, both in the first and second groups affected greater cytotoxicity in lung cancer cells than in macrophage cells, and in the third experimental extract with additional ginger and licorice. In conclusion, when using aconitum, ginseng, ginger, and licorice work in combination, which resulted in less impact on macrophage cells toxicity and more cytotoxicity in certain lung cancer cells.

ICT 기반의 인삼 공정 육묘 시 인삼 식물체 분석

김동현,김연복,구현정,백현진,이수빈,홍의기,김상기,장광진,Kim, D.H.,Kim, Y.B.,Koo, H.J.,Baek, H.J.,Lee, S.B.,Hong, E.K.,Kim, S.K.,Chang, K.J. 국립한국농수산대학교 교육개발센터 2021 현장농수산연구지 Vol.23 No.2

In order to compare and investigate the growth rates of each of the various soils, the soil mixing ratios were varied to four soils (Pitmos, Pearlite, Masato, General Soil, and Cocopeat). Ten were selected for each soil ratio and the average length and weight were compared. As a result, in the ratio of No. 1 pitmos 6.5: Perlite 2: Masato 1.5, it was measured as 16.36cm, 0.60g. In the ratio of No. 2 pitmos 10, 13.74cm, 0.41g. In the ratio of No. 3 general clay 10, it was measured as 12.43cm, 0.26g. 4 general clay 8, 0.39g. The growth rate of each soil was measured to be superior to that of other soil growth environments in the ratio of pitmos 6.5: pearlite 2: masato 1.5 soil. For ginseng plant analysis, 30 ginseng plants grown in the average length and weight of each soil at a ratio of 6.5: pearlite 2: masato 1.5 and relatively low-result general soil were selected and analyzed. As a result, 1,040ppm of nitrite nitrogen(NO₃-N) was higher in ginseng plants grown in general soil. There was no significant difference in phosphoric acid(P), potassium(K), and magnesium(Mg). Ginseng is characterized by poor growth when it exceeds 300ppm by combining ammonia tae (NH₄-N) and nitrate tae (NO₃-N) nitrogen. In addition, nitric acid produced in a part of this nitrite makes the pH reaction of the soil acidic, and the nitrite remaining in the soil evaporates into gas.

철원양파의 저장실험 연구

김동현,김연복,구현정,이희종,강창수,백현진,이정세,장광진,Kim, D.H.,Kim, Y.B.,Koo, H.J.,Leeo, H.J.,Kang, C.S.,Baek, H.J.,Lee, J.S.,Chang, K.J. 국립한국농수산대학교 교육개발센터 2019 현장농수산연구지 Vol.21 No.2

The purpose of this study was to compare the storage and post-storage changes of Cheorwon onions and onions for each region. Onion is a perennial plant belonging to the lily family. It is native to Persia of Southwest Asia. It is cultivated much in the temperate regions of the world. Cheorwon area is inland, but it has high continental climate due to its high altitude. Therefore it is said that the onion cultivated in this region has higher sugar content and higher taste than onion grown in southern region. Although the results of onion storage experiments in Cheorwon, Muan, Buan, and Changnyeong regions did not show much difference in weight, width, and height measurements before and after storage, Brix was reduced by approximately 1-2 brix. Before and after storing in each region, Brix was the highest in Cheorwon, Changnyeong, Buan, and Muan, and after saving, onions in Cheorwon were the same order. After each region was stored, the results showed that Cheorwon (112.3g), Muan (106g), Buan (102.1g) and Changnyeong (92.6g) had the highest hardness. Cold storage tests show that onions contain the least amount of corruption in paper boxes, while Cheorwon onions have the lowest level of corruption in other areas.

저방사화 철강재 의 시험편 크기 변화에 따른 (JLF-1) 파괴저항곡선의 변화

김동현(D.H.Kim),윤한기(H.K.Yoon),이상필(S.P.Lee),A.Kohyama 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.11

Reduced activation ferritic steel (JLF-1) is considered as a promising candidate material for blanket<br/> or first-wall structure of D-T fusion reactors. The fracture tests of fracture resistance curve (J-R curve)<br/> and JIC are desirable to investigate the exact fracture toughness of JLF-1 steel, since it has a high<br/> ductility. The fracture toughness of JLF-1 steel is affected by the configuration of test specimen such<br/> side groove, specimen thickness or specimen size. In this study, the fracture toughness tests were<br/> performed with various size(plane size and thickness) and various side groove of specimens. The test<br/> results showed the standard specimen with the side groove of 40 % represented a valid fracture<br/> toughness. The fracture resistance curve increased with increasing plane size and decreased with<br/> increasing thickness. However, the fracture resistance curve of half size specimen was similar to that of<br/> the standard specimen.

고중량물 이송가능한 이족보행로봇의 개발

최형식(H. S. Choi),김동현(D. H. Kim),강동완(D. W. Kang) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.10

In this paper, for moving heavy object a new type of human-sized Biped Walking Robot, KUBIR2, driven by the closed-chain type of joint actuator was developed Kubir2 is totally composed of29 degree-of-freedom as head is 4 d.o.f, arms are 12 d.o.f, legs are 12 d.o.fand waist is 1 d.o.f. The weight of the robot is 75(Kg) with 160㎝ tall, but the robot is designed to be capable of supporting 120Kg. The weight of one arm is light enough to be 9kg but capable of delivering 10㎏ load. Linear movement of joint actuators is composed of the four-bar-link mechanism driven by the ball screw which has high strength and high gear ratio. The control system of the robot is developed by using embedded computer and TMS320LF2407 DSP microprocessors. Each joint actuator is controlled by using DSP microprocessors. The communication system between the main controller and joint controllers is developed using the CAN communication system. The performance of the developed robot was validated through walking experiments with supporting 15(㎏) load.

아인산염 처리에 따른 철원양파의 페놀화합물 비교 연구

김연복,이희종,박철호,김동현,구현정,장광진,Kim, Y.B.,Lee, H.J.,Park, C.H.,Kim, D.H.,Koo, H.J.,Chang, K.J. 국립한국농수산대학교 교육개발센터 2018 현장농업연구지 = Journal of practical agricultural resear Vol.20 No.2

The aim of this study was to evaluate the change of phenolic compounds after phosphite treatment on Cheorwon onion. Onion is a perennial plant belonging to the lily family. It is native to Persia of Southwest Asia. It is widely cultivated in the temperate regions of the world. Onion is a good name for the 'Okchong' to drop blood cholesterol and cardiovascular blood flow to increase the prevention of adult diseases. Cheorwon area is inland, but it has high continental climate due to its high altitude. Therefore it is said that the onion cultivated in this region has higher sugar content and higher taste than onion grown in the southern region. Phosphorus components are particularly important ingredients for promoting muscle development. However, if the phosphoric acid content of the soil part is maintained to a large extent until the harvest, the competition of the nutrients tends to cause decay of the root part. Therefore, it is important to improve the quality and shelf life of onion by inducing nutrient balance by applying foliar fertilization method on the reducing phosphorus at harvest time. In this study, acidity was controlled by diluting phosphorous acid(H₃PO₃) and potassium hydroxide(KOH), followed by leaf surface treatment with phosphite on onion. In this study, the concentration of phosphite was diluted to 500, 1,000, 1,500ppm and sprayed three times over the onion leaves in May 2018 using an atomizer and harvested at the end of June, and the phenolic compounds were analyzed by HPLC. As a result, the content of quercetin, one of the important substances in onion, was phosphite 500ppm(179.70㎍/g), 1,000(150.27), 1,500(105.95). The contents of caffeic acid, p-coumaric acid, ferulic acid, rutin, kaempferol, and sugar content were higher in the treatments than in the control. Therefore, the phosphite does not have a great influence on the growth, but it may play a role as a method of achieving balance with nitrogen in the rainy season by supplying the role of the material catalyst and the water soluble phosphoric acid and the potassium in the influence of the material change.

기계요소부품을 이용한 3D 프린팅 부품의 고기능화 및 단가 절감 설계 방법

오원정(W. J. Oh),김동현(D. H. Kim),황슬기(S. G. Hwang),강동기(D. K. Kang),김동현(D. H. Kim),김충수(C. S. Kim) Korean Society for Precision Engineering 2021 한국정밀공학회 학술발표대회 논문집 Vol.2021 No.11월

항공산업 및 자동차 산업 등 여러 산업분야에서, 핵심 부품에 대한 높은 기계적 성능을 요구할 뿐만 아니라 연비 및 단가와 같은 경제성에 대한 요구도 동시에 증가하고 있다. 전통적인 제조 방법은 특정 수준의 복잡성 이상으로 제조가 불가능 하여 많은 제약이 있었으나, 위상 최적화(Topology Optimization) 방법을 통해 형상을 최적화하고, 3D 프린팅 공정으로 제조를 할 경우 제품의 기계적 성능을 유지하며, 경량화를 통해 경제성 또한 만족시킬 수 있다. 하지만 일반적으로 3D 프린팅으로 제조된 재료는 이방성을 가지기 때문에 원하는 기계적 성능을 확보하는데 어려움이 있으며, 제조원가 또한 높다는 단점이 존재한다. 따라서 본 연구에서는 3D 프린팅을 통하여 제품의 부피를 감소시킴과 동시에 중요 위치에 축계 및 중공축계 등의 낮은 단가의 기계부품 요소를 적용하여 제품의 안정성 및 낮은 공정단가를 확보하는 기계요소 부품 조립을 고려한 설계방법론을 제시하였다. PA 12 Polyamide 로 구성된 브라켓(Bracket)에 대해 기계요소 부품 조립을 고려한 설계를 수행하였고, 이 설계에 대한 구조해석 및 단가를 산출하였다. 산출된 결과는 기존 브라켓의 데이터와 비교되었으며, 그 결과 제안된 브라켓의 휨 변위는 65%, 단가는 30% 이상 감소된 것으로 나타났다. 본 연구를 통해 3D 프린팅의 도입을 고려하는 산업 외 다양한 산업에서 3D 프린팅의 도입을 재고할 수 있을 것이다.

피칭운동을 하는 대형 우주발사체 형상의 천음속 비정상 유동해석

김동현(D. H. Kim),김요한(Y. H. Kim),김동환(D. H. Kim),윤세현(S. H. Yoon),김광수(G. S. Kim),장영순(Y. H. Jang),김수현(S. H. Kim) 한국전산유체공학회 2010 한국전산유체공학회 학술대회논문집 Vol.2010 No.11

In this study, steady and unsteady aerodynamic analyses of a huge rocket configuration have been conducted in the transonic flow region. Launch vehicle structural response can couple with transonic flow state transitions at the nose of payload fairing. Before doing fluid-structure coupled transonic aeroealstic simulations for a huge rocket configuration, transonic aerodynamic characteristics are investigated for pitching motions of the rocket with angle-of attack. Unsteady CFD analysis method with moving grid technique based on Reynolds-averaged Navier-Stokes equations with κ-ω SST transition turbulence model is applied to accurately predict the transonic loads of the rocket with pitching motion. It is importantly shown that the fluctuated amplitude of lateral aerodynamic loads imposed on the rocket due to pitching motion can be significantly increased in the transonic region when the rocket has certain angle-of-attack.