• Proceedings of the Korean Society for Agricultural Machinery Conference
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• 2001.07a
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• pp.21-26
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• 2001

• Proceedings of the Korean Society for Agricultural Machinery Conference
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• 1999.12a
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• pp.308-314
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• 1999

• Proceedings of the Korean Society for Agricultural Machinery Conference
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• 1998.12a
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• pp.69-75
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• 1998

• Proceedings of the Korean Society for Agricultural Machinery Conference
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• 1998.12a
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• pp.223-230
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• 1998

• Proceedings of the Korean Society for Agricultural Machinery Conference
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• 1998.12a
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• pp.231-236
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• 1998

• Archives of Plastic Surgery
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• v.34 no.5
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• pp.647-652
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• 2007

Purpose: Single hair transplantation for eyebrow loss has been considered as a good method of achieving natural appearance of eyebrow. To date, however, no study has reported the survival rate following single hair transplantation for cicatricial eyebrow alopecia. Methods: We performed single hair transplantation using Choi hair transplanter for 49 cases of scarring eyebrow loss from March 2003 to March 2006. Of these cases, 33 could be under a follow-up postoperatively for more than seven months. These 33 cases comprised 20 men and 13 women. Mean follow-up period was 12 months (7-36 months). In 17 patients(51.5%), 100 to 200 hairs were unilaterally transplanted. Results: Following initial hair transplantation, the surgical outcome was excellent in 11 cases(33.3%), good in 12 cases(36.4%), fair or poor in the remaining ten cases(30.3%). All procedures were done under intravenous sedation and local or regional block anesthesia. It took about one and a half hours for us to transplant 200 hairs. The shape of eyebrow was aesthetically acceptable with a good direction and an ideal inclination of hairs. No patients developed notable complications, while 30 percent had a low survival rate. Conclusion: Single hair transplantation using Choi hair transplanter is a safe, effective surgical method for scarring eyebrow loss.

• Journal of Bio-Environment Control
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• v.25 no.2
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• pp.100-105
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• 2016

In this study we investigated the suitability of horticultural main organic root substrate materials (peatmoss, coir) for the development proper root substrate for working with bulb onion transplanter. We investigated seedling sprout ratio, growth and characteristics (bulk density, root substrate cohesion) those are suitable for mechanical transplanting by mixing with inorganic materials(red clay etc.). Although both seedling growth and root substrate bulk density were similar in peatmoss and coir based root substrates, we found that peatmoss mixing had higher root substrate cohesion compared to coir mixing. We assume that higher cohesion properties of peatmoss based root substrate will give more weight of root part during mechanical transplanting of young onion seedlings in the field. Because of this, we suggest that peatmoss is the appropriate ingredient for developing root substrates for working with bulb onion transplanter.

• Journal of Biosystems Engineering
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• v.30 no.3 s.110
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• pp.135-140
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• 2005

Vegetable transplanting operation has been wholly depended on human labor that needs 18.4 hrs per 10 acres in Korea. Since periods of vegetable transplanting operations are limited, their mechanization has been strongly demanded. This study was conducted to develop a transplanting device that was the core technology for vegetable transplanter. In order to find out transplanting track and velocity of transplanting device, a kinematic analysis software was employed. Evaluation of prototype was carried out in the circular soil bin with high speed camera. Rotary type transplanting device produced an elliptic loci when two links of different lengths were moving to the opposite direction. The length of two links was 75mm and 44mm, respectively. Maximum displacement of rotary type transplanting device was 238mm. It seemed that the transplanting elliptic loci of transplanting device were identical between the simulation output generated by kinematic analysis software and the circular soil bin test result with a high speed camera. The rotary type transplanting device can be suitable fur transplanting short height vegetable, less than 20 cm length vegetables such as Chinese cabbage and cabbage, etc.

• Journal of Biosystems Engineering
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• v.4 no.1
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• pp.48-57
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• 1979

In order to obtain a standard reference for designing an adequate power rice transplanter, the cutting forces depending upon variety of seedling, sowing density, seedling age and soil moisture content of mat-type seedling were measured by the rice transplanter installed with force measuring device of dynamic strain gage system in the laboratory. The result of this study are summarized as follows : 1. Cutting velocity and acceleration transplanting hoe obtained from jinematic analysis of planting mechanism was 1.32m/sec and 81.5m/$sec^2$ when planting crank-shaft rpm was 160. 2. Little difference between cutting forces on 30-days old seelings of japonica and Indica type was observed, as the cutting forces determined were 2.0kg per hill for Japonica type and 2.1kg per hill for Indica type. 3. Cutting forces determined on 40-days old seedlings were 2.5kg, 2.3kg, 3.1kg and 2.9kg per hill for Milyang No.15, Tongil, Akibare and Milyang No.23 compared to the other varieties. 4. The cutting force was not greatly affected by the sowing densities , only five percent of differences were observed epending upon the sowing densities. 5. Cutting forces were 2.7kg and 2.0kg per hill on 40-days old seedlings and 30-days old seedlings respectively. About 38 percent of more forces was required in cutting 40-days old seedling than in cutting 30-days old seedlings. 6. More cutting forces were required as soil moisture content of mat-type seedling was decreased. 7. Root length after cutting by the planting hoe and their relationships with soil moisture content on 30-days old seedlings, are as follows ; $y=4.147-11.384x+ 28.854x^2$ where , $y$=root length after cutting. (cm) , $x$=soil ture content of mat type seedlings.(%, d.b.) 8. Cutting forces were varied with the width of cuttings ; those on 40-days old mat type seedlings were 2.7kg and 2.2kg per hill when cutting with 14 mm and 10mm of width respectively, about 32 percent of more forces was required when cuting with 14mm of width compared to 10mm of width.

• Journal of agriculture & life science
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• v.52 no.6
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• pp.127-138
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• 2018

In this study, the operational characteristics of a domestic vegetable transplanter were investigated. The main functional components and power path of the tranplanter were analyzed. The link structure of transplanting device waskinematically analyzed, and 3D modeling and dynamic simulation were performed. Based on this analysis, the trajectory of the bottom end of the transplanting hopper was analyzed. Also, the plant spacing according to the engine speed and the shifting stage of transplanting transmission was analyzed and verified by field test. As main results of this study, the transplanting device is one degree of freedom(DOF) 4-bar link type mechanism which comprises 10 links and 13 rotating joints. The transplanting hopper plants seedlings in a vertical direction while maintaining a constant posture by the links of transplanting device. The power is transmitted to both the driving part and transplanting part from the engine, and the maximum and minimum plant spacing of the transplanting device were 428.97 mm and 261.20 mm.