• Proceedings of the Korean Society for Agricultural Machinery Conference
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• 1999.07a
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• pp.282-289
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• 1999

선별은 청과물을 포장하기 이전에 크기, 중량, 색깔등 정해진 규격에 따라 고르는 과정을 말하고, 크게 인력선별과 기계선별, 개별선별과 공동선별로 구분한다. 국내의 경우 아직까지도 수확된 청과물은 농가단위로 개별선별하고 있으며, 중량식 선별기를 이용하여 등급선별 한 후 15kg, 10kg 상자에 포장하는 것이 가장 일반적이다. 근래에 청과물의 부가가치를 높이기 위해서 중량에 색깔을 선별할 수 있는 기능을 추가한 기계시스템이 개발되어 산업화된 바 있다(최 등, 1997). 또한 근적외선 분광분석법을 이용하여 과일의 당도를 비파괴적으로 측정 선별할 수 있는 시스템이 개발 실용화 단계에 있다(이 등, 1998). (중략)

• Proceedings of the Korean Society of Crop Science Conference
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• 2018.10a
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• pp.155-155
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• 2018

• Proceedings of the Korean Society of Crop Science Conference
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• 2019.04a
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• pp.79-79
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• 2019

• Journal of the Korean Society of International Agriculture
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• v.30 no.4
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• pp.370-375
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• 2018

In order to promote the mechanized cultivation of perilla for seed, which has been increasing in cultivation area and production recently as demand increases according to the health-functional effects, we carried out this experiment to determine the optimum sowing time of perilla to minimize the seed loss at harvest and increase the yield. We used two different types of perilla varieties, 'Sodam(small-branch)' and 'Deulsaem(multi-branch)', and the sowing time was June 15, June 30, July 15 and August 1. As the sowing time is late, days of growth from sowing to flowering were shortened, and they were shortened from 14, 26 and 31~32 days on June 30, July 15 and August 1 as compared with June 15, respectively. And, the stem length and culm diameter were shortened or tapered and the number of nodes tended to decrease. The number of effective branch was 82%, 61% and 56% on June 30, July 15 and August 1 as compared with June 15, respectively. Accordingly, it seems to make against in securing the yield from July 15. And, the lowest cluster height was generally shorter as the sowing time is late, and the height was below 15cm on July 15 and August 1. It seems that this may work against the machine harvest. There was a high degree of significance between the sowing time and the yield. Although, the total yield was not statistically significant among June 15, June 30 and July 15, the ratio of shattering seed at harvest was in order of July 15, August 1(30.3%)> June 15(15.3%)> June 30(13.5%). Therefore, the net yield except for shattered seed was higher in order of June 30${\geq}$ June 15> July 15> August 1. This tendency was characteristic regardless of variety and sowing method. And, the protein content in perilla seed increased as the sowing time was delayed, and the content was the highest on August 1. The content of crude fat was relatively high on June 15 and July 15 in 'Sodam', and June 30 and July 15 in 'Deulsaem', respectively. And, the content of linolenic acid was found to be the highest on August 1. As a result, the optimal sowing time for machine harvest of perilla for seed is about June 30. At this time, it is determined that the sowing time is the most suitable to be advantageous in increasing the yield of perilla seed, while minimizing the seed loss due to the shattering at harvest.

• Proceedings of the Korean Society for Agricultural Machinery Conference
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• 2002.07a
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• pp.357-362
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• 2002

시금치는 비타민과 칼슘이 많은 알칼리성 건강채소이며 잎을 이용하는 잎 채소의 하나로 비닐하우스 내에서나 노지에서 사철 재배되는 채소이다. 이 시금치는 산지에서 연간 9-10개월 정도 출하되며 매일 밭에서 낫이나 칼로 수확한 시금치를 과일상자나 푸대 등에 담아서 운반하여 하우스나 가옥 등의 일정한 장소에서 떡잎이나 하엽 등의 못쓰는 잎과 뿌리 등을 절단하여 다듬기 작업을 한 후에 상자나 묶음으로 하여 출하하고 있는 실정이다. (중략)

• Korean Journal of Plant Resources
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• v.9 no.1
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• pp.63-69
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• 1996

The experiment was conducted to reduce the labor and production cost with the labor save of harvest in cultivating the onion using the machine and the results are as follows. On labor saving effect in transparent vinyl mulching, digging working hours per 10a in the case of using tractor are 55 min., fixing + turning time is 11 min.,the time of harvest is 66 min, digging working hours using cultivator are 90 min. and fixing + turning time is 9 min., but the time of hand harvesting is 693 min and 41 sec. and in digging labor saving effect, tractor shows 90% in the harvesting period and harvest by cultivator 86%. On nonmulching cases, the harvest by tractor takes 44 min. and that by cultivator does 75 min, and digging labor saving effect shows 93.6% in the tractor harvest and 89% in the cultivator harvest. Therefore, on the operation efficiency per hour, in the case of tractor with digger vinyl mulching and nonmulching show $0.091\sim0.136ha$ and in the case of cultivator with digger-both show $0.061\sim0.08ha$, but in the case of hand harvest, vinyl mulching and nonmulching are $0.008\sim0.009ha$, so in the mechanized harvest of onion, the harvest by tractor with digger is the best. On the cost and labor save for harvesting the onion with labor saving effect, tractor shows 19 hours and 26min./10a in vinyl mulching and 18 hours and 54min./10a in nonmulching, so it shows the short hours for harvesting. And labor saving effect shows 37% in comparison with 29 hours and 49 min. $\sim30$ hours and 38 min.($110,587\sim113,925won$) of the hand harvest, so the cost was reduced to $69,525\sim72,225won$. On the cultivator with diggers, vinyl mulching takes 19 hours and 49 min and nonmulching 20 hours and 2 min., so the labor saving effect and cost were reduced to $32\sim36%$($73,087\sim75,075$ won) in comparison with the hand harvest.

• Korean Journal of Breeding Science
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• v.42 no.6
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• pp.721-726
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• 2010

'Nampung', a new soybean cultivar for soy-paste, was developed from the cross between Suwon190 and 'Pokwangkong' by soybean breeding team at the National Institute of Crop Science (NICS) in 2007. A promising line, SS97215-S-S-20, was selected and designated as the name of Milyang162. It was prominent and had good result from regional adaptation yield trials(RYT) for three years from 2005 to 2007 and was released as the name of 'Nampung'. It has a determinate growth habit, white flower, brown pubescence, yellow seed coat, light brown hilum, medium spherical seed (19.9 grams per 100 seeds). 'Nampung' is resistant to soybean mosaic virus and bacterial pustule, the major soybean disease in Korea. It is possible to harvest of 'Nampung' using combine because of it's lodging tolerance, few branches, and high position of pod attachment. The average yield of 'Nampung' is 2.97 ton per hectare in the regional yield trials (RYT) carried out for three years from 2005 to 2007 which is 21 percent higher than the check variety, 'Taekwang'.

• Korean Journal of Remote Sensing
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• v.37 no.2
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• pp.337-357
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• 2021

Because the growth of paddy rice is affected by meteorological factors, the selection of appropriate meteorological variables is essential to build a rice yield prediction model. This paper examines the suitability of multiple meteorological datasets for the rice yield modeling in South Korea, 1996-2019, and a hindcast experiment for rice yield using a machine learning method by considering the nonlinear relationships between meteorological variables and the rice yield. In addition to the ASOS in-situ observations, we used CRU-JRA ver. 2.1 and ERA5 reanalysis. From the multiple meteorological datasets, we extracted the four common variables (air temperature, relative humidity, solar radiation, and precipitation) and analyzed the characteristics of each data and the associations with rice yields. CRU-JRA ver. 2.1 showed an overall agreement with the other datasets. While relative humidity had a rare relationship with rice yields, solar radiation showed a somewhat high correlation with rice yields. Using the air temperature, solar radiation, and precipitation of July, August, and September, we built a random forest model for the hindcast experiments of rice yields. The model with CRU-JRA ver. 2.1 showed the best performance with a correlation coefficient of 0.772. The solar radiation in the prediction model had the most significant importance among the variables, which is in accordance with the generic agricultural knowledge. This paper has an implication for selecting from multiple meteorological datasets for rice yield modeling.

• KOREAN JOURNAL OF PACKAGING SCIENCE & TECHNOLOGY
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• v.27 no.2
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• pp.109-114
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• 2021

The characteristics of vibrational stress (shock and vibration) during transport and the possibility of damage to the packaged pears by functional PLA tray were investigated. And this study was conducted to analyze how environmental conditions by simulated transport environment affect quality factors such as weight loss (%) and soluble solid content (SSC, %), and firmness (bioyield strength, kPa) of packaged pears by PLA tray and Expanded PET foam pad (Group 1), EPE cushion cup pad and net (Group 2) for exporting. Pears with or without vibration stress were stored for 30 days at low temperatures (5 ± 0.8℃, 80 ± 5% relative humidity). There was the statistically significant difference (p ≤ 0.05) between pears with and without vibration stress for weight loss, soluble solid content, and firmness (bioyield strength) after 30 days storage. Vibration stress accelerated pear quality deterioration during storage, resulting in increased weight loss, soluble solids content, and reduced hardness. The firmness (bioyield strength) and weight changes of pears with PLA trays were smaller than those of conventional packaging box systems. It was determined that the firmness of agricultural products was a quality factor closely related to the storage period and that PLA could be applied.

• Proceedings of the Korean Society for Agricultural Machinery Conference
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• 2002.07a
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• pp.121-127
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• 2002

당근은 미나리과에 속하는 직근성 채소로서 비타민A가 다량 함유된 건강식품으로 우리나라에 6,000㏊ 내외로 재배되고 있다. 재배지역은 우리나라 전체 재배면적 중에서 남제주군 지역이 44.5%, 경남 김해, 양산지역이 16.1%, 강원 평창지역이 11.1%를 점유하고 있으며 총 재배면적의 70% 이상이 주산단지 화되어 있어 기계화가 용이한 작목이다. 당근재배에 있어서 10a당 작업단계별 노동투하시간을 보면 전체 100.2시간으로 경운정지, 방제작업만 기계화가 이루어지고 대부분 인력에 의존하고 있는 실정이다. (중략)