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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Journal of Biosystems Engineering
Journal Basic Information
Journal DOI :
Korean Society for Agricultural Machinery
Editor in Chief :
Volume & Issues
Volume 33, Issue 6 - Dec 2008
Volume 33, Issue 5 - Oct 2008
Volume 33, Issue 4 - Aug 2008
Volume 33, Issue 3 - Jun 2008
Volume 33, Issue 2 - Apr 2008
Volume 33, Issue 1 - Feb 2008
Selecting the target year
Evaluation of Ride Vibrations of Agricultural Tractors
Kim, H.J. ; Kim, K.U. ;
Journal of Biosystems Engineering, volume 33, issue 3, 2008, Pages 151~156
DOI : 10.5307/JBE.2008.33.3.151
This study was conducted to evaluate ride vibrations experienced by tractor operators during plowing, rotovating, and transporting operations in Korea. Field data of ride vibrations were taken at the operator-seat interface from 49 tractors and analyzed on the basis of ISO 2631-1 and EU Directive 2002/44. Of the measured ride vibrations 15.4% in the plowing and 12.5% in farm road transport exceeded the 8-hour fatigue decreased proficiency boundary in the fore and aft directions at frequencies from 1 to 5 Hz. 93.9% exceeded the 8-hour potential health risk of ISO 2631-1. The ride vibrations exceeding the 8-hour exposure limit were 38.5% in plowing, 31.6% in rotovating, 100% in farm road transport and 88.9% in concrete road transport. Although most tractor operators were not exposed to ride vibrations greater than the 8-hour exposure limit value (ELV) of EU Directive 2002/44, 7.7% of the operators in the plowing experienced greater vibrations than the ELV in the fore-aft direction. Farm road transport produced greater vibrations than any other operations. Concrete road transport, plowing and rotovating operations followed next. Limit criteria for ride vibration exposure differ depending upon the guidelines. Exposure limit of the health guidance caution zone of ISO 2631-1 is lowest among its kinds.
A Study on Ergonomics Design of Wheelbarrow for Melon Farm on Protected Horticulture
Lee, S.S. ; Kim, Y.H. ; Choi, A.R. ; Mun, J.H. ;
Journal of Biosystems Engineering, volume 33, issue 3, 2008, Pages 157~166
DOI : 10.5307/JBE.2008.33.3.157
Protected horticulture is labor-intensive. It necessitates great amount of labor in many tasks including grafting, pollination and harvesting. Particularly, carrying crops involves the most intensive labor which leads to a high risk of musculoskeletal disorder. Thus, this study aims at developing an ergonomic vehicle to reduce this intensity of labor and ergonomic evaluation by applying the newly developed vehicles to REBA. 5 healthy male subjects with no records of any musculoskeletal disorder were participated in this study. The experimental units were divided into three categories: lifting, lowering and pushing tasks. The results showed that the developed vehicle received less loads in group B (arms and wrists) than in group A (trunk, neck and legs). Especially, the developed vehicle scored
in group C on REBA while the conventional wheelbarrow got
, regardless of working postures. In conclusion, the developed ergonomic vehicle provided less loads for human bodies compared to the conventional one.
Storage Characteristics of Rough Rice by Storage Method
Lee, J.S. ; Hong, H.K. ; Kang, T.H. ; Li, H. ; Ham, T.M. ; Kim, Y.H. ; Han, C.S. ;
Journal of Biosystems Engineering, volume 33, issue 3, 2008, Pages 167~172
DOI : 10.5307/JBE.2008.33.3.167
The objective of this study was to investigate the adequate storage method that was able to maintain the high quality of rough rice according to storage methods and period. The quality change of the rough rice during the storage period was evaluated by storage method such as cooling bin using winter cold air, ordinary temperature bin, freezing, refrigeration and indoor storage. Moisture content, brown rice whiteness, hardness, crack ratio and germination ratio were measured in this study. Moisture content of rough rice stored in cooling bin using winter cold air and ordinary temperature bin were decreased by 0.07% and 0.42%, respectively, which were lower than the other storage method. The hardness of brown rice increased in order of storage method such as winter cooling bin, normal bin, freezing storage, refrigeration storage and indoor storage. Crack ratio by indoor and ordinary temperature bin storage were increased by 2.68% and 3.63%, respectively, whereas cooling bin using winter cold air, refrigeration and freezing storage showed below 1.0%. The highest germination rate was found in cooling bin using winter cold air. As a result, cooling bin using winter cold air can be evaluated for the adequate storage method of rough rice.
Physical Properties of Rapeseed (II)
Hong, S.J. ; Duc, Le Anh ; Han, J.W. ; Kim, H. ; Kim, Y.H. ; Keum, D.H. ;
Journal of Biosystems Engineering, volume 33, issue 3, 2008, Pages 173~178
DOI : 10.5307/JBE.2008.33.3.173
Some physical properties of rapeseed were measured at five moisture levels of 10.03, 14.91, 20.07, 25.06 and 30.12% (w.b.), which include frictional properties (coefficient of static friction, emptying and filling angle of repose) and aerodynamic properties (terminal velocity and drag coefficient). The physical properties of rapeseed were evaluated as a function of seed moisture content. In the moisture content range, the coefficients of static friction, emptying and filling angle of repose increased linearly with increase of moisture content. The maximum values of coefficients of static friction were on the acrylic surface, varied from 0.34 to 0.43; the next is on the galvanized steel, varied from 0.30 to 0.38; and the minimum were on stainless steel surface, varied from 0.27 to 0.35. Emptying and filling angle of repose varied from 26.12 to 29.62 and 23.83 to 27.05 degrees, respectively. Terminal velocity increased linearly from 3.47 to 3.91 m/s with increase of moisture content. Drag coefficient varied from 1.84 to 1.64 as the moisture content increased. The relationship between drag coefficient and moisture content were expressed by non-linear equation.
Effect of the Seed Hopper Vibration on the Seeding Performance of the Vacuum Suction Nozzle Seeder
Min, Y.B. ; Kim, S.T. ; Kwon, H.D. ; Moon, S.W. ; Kang, D.H. ;
Journal of Biosystems Engineering, volume 33, issue 3, 2008, Pages 179~185
DOI : 10.5307/JBE.2008.33.3.179
The seeding rates of the vacuum suction nozzle seeders are affected by the jumping height of the seeds on the vibrating seed hopper. This study was performed to investigate the optimum vibration condition of the seed hopper on the vacuum suction nozzle seeder for improving seeding performance. Experiments were carried out to determine the vibration conditions of the seed hopper by air pressure and eccentric weight, and to optimize the seed-pickup performance of each nozzle by suction pressure. As the result with the experiments, the fluctuations of the jumping height of the seeds were showed at amplitude 0.4 mm and frequency 42 Hz, and jumping heights of the seeds were increased as the air pressure increase and the eccentric weight decrease, regardless number of seeds of the hopper. The best seeding rate of the seed hopper was 98% at the 300-seed cell, when the condition of the seed hopper was the suction air pressure of 94.6 kPa-abs., amplitude and frequency of the seed hopper vibration were at 0.57 mm and 43.6 Hz, respectively. The optimum vibrating conditions of the seed hopper were decided into frequency 43.6-43.8 Hz and the amplitudes 0.61-0.62 mm.
Multi-functional Automated Cultivation for House Melon;Development of Tele-robotic System
Im, D.H. ; Kim, S.C. ; Cho, S.I. ; Chung, S.C. ; Hwang, H. ;
Journal of Biosystems Engineering, volume 33, issue 3, 2008, Pages 186~195
DOI : 10.5307/JBE.2008.33.3.186
In this paper, a prototype tele-operative system with a mobile base was developed in order to automate cultivation of house melon. A man-machine interactive hybrid decision-making system via tele-operative task interface was proposed to overcome limitations of computer image recognition. Identifying house melon including position data from the field image was critical to automate cultivation. And it was not simple especially when melon is covered partly by leaves and stems. The developed system was composed of 5 major modules: (a) main remote monitoring and task control module, (b) wireless remote image acquisition and data transmission module, (c) three-wheel mobile base mounted with a 4 dof articulated type robot manipulator (d) exchangeable modular type end tools, and (e) melon storage module. The system was operated through the graphic user interface using touch screen monitor and wireless data communication among operator, computer, and machine. Once task was selected from the task control and monitoring module, the analog signal of the color image of the field was captured and transmitted to the host computer using R.F. module by wireless. A sequence of algorithms to identify location and size of a melon was performed based on the local image processing. Laboratory experiment showed the developed prototype system showed the practical feasibility of automating various cultivating tasks of house melon.
Development of Tele-image Processing Algorithm for Automatic Harvesting of House Melon
Kim, S.C. ; Im, D.H. ; Chung, S.C. ; Hwang, H. ;
Journal of Biosystems Engineering, volume 33, issue 3, 2008, Pages 196~203
DOI : 10.5307/JBE.2008.33.3.196
Hybrid robust image processing algorithm to extract visual features of melon during the cultivation was developed based on a wireless tele-operative interface. Features of a melon such as size and shape including position were crucial to successful task automation and future development of cultivation data base. An algorithm was developed based on the concept of hybrid decision-making which shares a task between the computer and the operator utilizing man-computer interactive interface. A hybrid decision-making system was composed of three modules such as wireless image transmission, task specification and identification, and man-computer interface modules. Computing burden and the instability of the image processing results caused by the variation of illumination and the complexity of the environment caused by the irregular stem and shapes of leaves and shades were overcome using the proposed algorithm. With utilizing operator's teaching via LCD touch screen of the display monitor, the complexity and instability of the melon identification process has been avoided. Hough transform was modified for the image obtained from the locally specified window to extract the geometric shape and position of the melon. It took less than 200 milliseconds processing time.
Development of Gate Type RFID System Using UHF Band for Food and Agricultural Products Logistics
Kim, J.H. ; Jeong, J.W. ; Kwen, K.H. ; Kang, J.S. ;
Journal of Biosystems Engineering, volume 33, issue 3, 2008, Pages 204~209
DOI : 10.5307/JBE.2008.33.3.204
The power strength of electric wave of reader looked radiation forms from the gate type RFID system. The more distant from antennas, the weaker of power strength of electric wave. The power strength of electric wave with 3 antennas showed stronger than its with 2 antennas. With 2 antennas, the coefficient of correlation between the power strength of electric wave and response ability of tag was 0.665 (p=0.009), and it showed results at significance level. With 3 antennas, the coefficient of correlation was 0.711 (p=0.004), correlationship between the power strength of electric wave and the response ability of tag showed at significance high level. From the analysis result about tag reading performance on the gate type RFID system, the reading rate was good when tags were attached on a acrylic plate which were located in front of 3 or 4 antennas. As tags were getting away from antennas, the reading rate was decreased. The nearer from antennas, the higher the reading rate at the center. When tags were turned at right angles with antennas, the longer distant from antennas, the lower reading rates at the center, right and left locations. When the number of antennas and distance are constant, respectively, the significant difference of the tag reading rates according to the locations of left, right and center were not found.
Development of Measuring Technique for Somatic Cell Count in Raw Milk by Spectroscopy
Choi, C.H. ; Kim, Y.J. ; Kim, K.S. ; Choi, T.H. ;
Journal of Biosystems Engineering, volume 33, issue 3, 2008, Pages 210~215
DOI : 10.5307/JBE.2008.33.3.210
The objective of this study was to develop models to predict SCC (somatic cell count) in unhomogenized milk by visible and near-infrared (NIR) spectroscopic technique. Total of 100 milk samples were collected from dairy farms and preserved to minimize propagation of bacteria cells during transportation. Reductive reagents such as methyl red, methylene blue, bromcresol purple, phenol red and resazurin were added to milk samples, and then colors of milk were changed based on SCC of milk. For optimal reductive reagents, reaction time was controlled at 3 level of reaction time. A spectrophotometer was used to measure reflectance spectra from milk samples. The partial least square (PLS) models were developed to predict SCC of unhomogenized milk. The PLS results showed that milk samples with reductive reagents had a good correlation between predicted and measured SCC at 5 minutes of reaction time in the visible range. The PLS models with resazurin reagent had the best performance in
. The prediction results of milk samples with resazurin had 0.86 of correlation coefficient and 14,184 cell/mL of SEP.