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Volume 66, Issue 6
Displaying 1-23 of 23 articles from this issue
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S. OHSHITA2004 Volume 66 Issue 6 Pages 1-2
Published: November 01, 2004
Released on J-STAGE: April 30, 2010
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2004 Volume 66 Issue 6 Pages 3
Published: November 01, 2004
Released on J-STAGE: April 30, 2010
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2004 Volume 66 Issue 6 Pages 4
Published: November 01, 2004
Released on J-STAGE: April 30, 2010
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2004 Volume 66 Issue 6 Pages 5
Published: November 01, 2004
Released on J-STAGE: April 30, 2010
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Kazufumi SHIMIZU2004 Volume 66 Issue 6 Pages 7-9
Published: November 01, 2004
Released on J-STAGE: April 30, 2010
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Koji INOOKU2004 Volume 66 Issue 6 Pages 10-11
Published: November 01, 2004
Released on J-STAGE: April 30, 2010
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Muneki TOMITA2004 Volume 66 Issue 6 Pages 12-14
Published: November 01, 2004
Released on J-STAGE: April 30, 2010
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Shigeyoshi TSUKAMOTO2004 Volume 66 Issue 6 Pages 15-17
Published: November 01, 2004
Released on J-STAGE: April 30, 2010
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Y. OZAWA2004 Volume 66 Issue 6 Pages 18-20
Published: November 01, 2004
Released on J-STAGE: April 30, 2010
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T. TABUCHI2004 Volume 66 Issue 6 Pages 21-22
Published: November 01, 2004
Released on J-STAGE: April 30, 2010
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Takeshi SHIKANAI, Masami UENO2004 Volume 66 Issue 6 Pages 41-50
Published: November 01, 2004
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSThere is an increasing recognition in sugarcane production that growth prediction is needed for more efficient management for farmers. Researchers have conducted studies in plant growth models to serve as effective support tools for growth prediction. One of the approaches is to analyze growth on the basis of logistic curve. However, the logistic function cannot express the phenomenon that shows a decrease in leaf weight due to senescence. We developed a sugarcane growth model that was described by simple equations for growth prediction of sugarcane with simulation of the senescing leaf. The model performance was consistent with the observed data. Small discrepancies between the simulated and observed data in the later stage of growth were probably due to inadequate provisions in the model for ripening.View full abstractDownload PDF (1413K) -
Kazuhiro TAKEKURA, Shuso KAWAMURA, Kazuhiko ITOH2004 Volume 66 Issue 6 Pages 51-59
Published: November 01, 2004
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSAn experiment in which rough rice was stored below ice point for 4 years was carried out to determine whether it was possible to preserve the quality of rice stored for a long period by super-low-temperature storage. The results of the experiment showed that the quality of rough rice after storage for 4 years under 5°C was comparable to that of rice before storage. The results of this experiment and the results of the experiment in which rough rice stored below ice point in farm-scale silos indicate that preservation of the quality of rough rice for long time is possible by storing rice at an average temperature under 5°C during storage.View full abstractDownload PDF (1267K) -
Evaluation of Correct Distinction Rate by Weeding and Thinner SimulationsMasaki TERAWAKI, Takashi KATAOKA, Hiroshi OKAMOTO, Shun-ichi HATA2004 Volume 66 Issue 6 Pages 60-66
Published: November 01, 2004
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSThe goal of this study is to develop the automatic weeding thinner using the machine vision for the direct sowing sugar beet. The computer simulations conducted to require the recognition rates of the sugar beet and weeds. As results; the suitable forcible thinning distance (the minimum distance to be vacated) was 10cm (average intrarow spacing; 12cm, set intrarow spacing after the weeding thinner operation; 24cm). If the obtained recognition rates of the sugar beet, ‘87.2%’ and the weeds, ‘94.4%’ were promised in the field test, the loss of sugar beet would be less than 5%. The performance of the automatic weeding thinner was affected by the recognition rate of weeds rather than that of the sugar beet.View full abstractDownload PDF (1201K) -
3-dimensional field map generationRyo SUGIURA, Noboru NOGUCHI, Kazunobu ISHII, Hideo TERAO2004 Volume 66 Issue 6 Pages 67-74
Published: November 01, 2004
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSThe objective of this study is to develop a remote sensing system that can generate a map regarding crop status and field information using an unmanned helicopter. The obtained image can be transformed to the global coordinate using the helicopter's position and posture if a sensed field has flat terrain. However, if the field has some inclinations, it is necessary to consider field terrain characteristic to maintain an accuracy of image mapping. In this research, a single axis laser range finder was adopted to obtain a field terrain information and the 3-demonsional image mapping algorism was developed. As a result of the field experiment, this system could generate a topographic map with 9cm error, and 3-dimensional image map with spatial error of 41cm.View full abstractDownload PDF (8378K) -
Eiji INOUE, Muneshi MITSUOKA, Sadahiro HARA, Hideyuki KONYA, Ken MORI, ...2004 Volume 66 Issue 6 Pages 75-85
Published: November 01, 2004
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSIn this study, the dynamic spring constant k and the viscous damping coefficient c of a rubber crawler, expressible in the form of a Fourier series from a previous study, were identified based on experimental results by the Levenberg-Marquardt method. Dynamic loading forces acting on second-and third-track rollers among four track rollers were employed for identification of k and c from comparison between the simulated vibration characteristics of agricultural rubber crawler vehicle using k, c obtained by exciting test and experimental ones. Next, the validity of the simulations after and before identification of and was discussed. As a result, the accuracy of simulation by using identified k, c was improved. Furthermore, it was suggested to be necessary to extend the non-linear mechanical model from a linear in order to conduct an more accurate simulation of driving a rubber crawler vehicle.View full abstractDownload PDF (3244K) -
Yoshinari MORIO, Kazuo HORIBE2004 Volume 66 Issue 6 Pages 86-95
Published: November 01, 2004
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSThe development of a communication system between workers and machines is effective to achieve an intelligent working system in collaboration with machines in agricultural field. In this paper, we developed a hand gesture recognition method as one of communication methods, which could extract and track moving objects by inter-frame difference method, and could detect and recognize the arc of the hand gesture. The hand gestures of six tested subjects in natural scene were recognized experimentally. When the size of the tested subject to the image height was about 60% and the speed of hand gesture was about once in a second, the method could recognize the hand gesture if only test subjects could gesture two times. The development of a robust recognition method against both the case that the size of a worker to the image height was too small such as 30%, 20%, and the case that the speed of hand gesture such as once in two seconds was too slow was essential to apply to real situation.View full abstractDownload PDF (9230K) -
Clarification of Relationship between Tillage Effect and Laser Displacement Sensor OutputTakahito IZUMI, Akira OIDA, Hiroshi NAKASHIMA, Juro MIYASAKA, Hiromich ...2004 Volume 66 Issue 6 Pages 96-102
Published: November 01, 2004
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSThe objective of this study is to develop a tilled soil clod fineness measurement method that uses non-contact and non-distractive technique. A laser displacement sensor was adopted as a sensing device, which was installed to an irregularity measuring system stationary set up for this study. We calculated an index of soil clod fineness from measured irregularity data. To obtain a relationship between laser displacement sensor outputs and tilled clod size, we did a calibration experiment in the laboratory. We then applied our system to a tilled soil experiment in a field.
As a result, it is confirmed that clod size and index of soil clod fineness (i. e. Roughness) calculated from irregularity data shows a linear relationship.View full abstractDownload PDF (4980K) -
Tea Process SupervisorHitoshi YOSHITOMI, Osamu SUMIKAWA, Daisuke MIYAMA2004 Volume 66 Issue 6 Pages 103-112
Published: November 01, 2004
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSA system which can control the whole manufacturing process of sencha together was developed. The software of the system consists of three layers which have own function. Supervisor, the upperest layer is independent from the hardware. The machines are controlled by the feedback system which calculates the optimum values according to the tea state. The control values were calculated by fuzzy control theory. The system can be operated interactively by a graphical user interface.View full abstractDownload PDF (2839K) -
Toshikazu KAHO, Sakae SHIBUSAWA, Eiji MORIMOTO, Shin-ichi HIRAKO, Astu ...2004 Volume 66 Issue 6 Pages 113-121
Published: November 01, 2004
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSThe stability and availability of soil reflectance records were evaluated using a modified real-time soil spectrophotometer. The results clarified that the reflectance was usable in the wavelength range of 550-1650nm. Using the 857 bits of scanning data obtained from the field experiment, the mean of distances between the soil and the sensor probes was estimated to be about 86mm with 3.3mm standard deviation. Simulations of illumination and reflection indicated that a distance of 55-90mm can provide a stable condition to get correct soil reflectance, and that a variation of the distance can affect the apparent soil absorption of light energy. Correct estimation of soil parameters requires distinctive calibration models for the soil spectrophotometer.View full abstractDownload PDF (3701K) -
Utilization of Simple Cutting Devices for Cleft GraftingShinya MORIKAWA, Yoshifumi NISHIURA, Tateshi FUJIURA, Yuji TAKAURA2004 Volume 66 Issue 6 Pages 122-128
Published: November 01, 2004
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSUtilization of the rootstock cutting device and the scion cutting device was discussed to save the cleft grafting work. Practical cutting devices were developed on the basis of the prototypes reported previously. For the easy replacement of the cutting blades, the blades were assembled on a plastic base. The blades could be replaced with the plastic base more easily and safely compared with the prototypes. The developed practical devices have the cutting accuracy and operation efficiency equivalent to the prototypes. Time required to cut one rootstock was about 60% and time required to cut one scion was about 40% of the manual operation. As the result of the durability investigation, it was found clear that cutting edges can cut 2000 seedlings.View full abstractDownload PDF (7495K) -
Morinobu MATSUO, Koichi AMAHA, Tamaki KIDA, Kazutomo ICHITO, Masaru MU ...2004 Volume 66 Issue 6 Pages 129-135
Published: November 01, 2004
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSEnsiling equipment which reduces moisture content of grass was developed in order to process high moisture grass into high quality silage. The developed equipment consists of two conveyers and a device that measures the mass-flow rate of grass and adds moisture absorbing materials on grass. Moisture absorbing materials are added proportionally to the mass-flow rate of grass by using an ultrasonic distance sensor. Grass and added moisture absorbing materials are mixed continuously by using a double-shaft increasing pitch screw conveyer. The throughput and the power consumption of the developed equipment were 17.9t/h and 1.5kW, respectively. The Sudan grass silage processed by the developed equipment showed better fermentative quality and lower dry matter disappearance rate than the non-processed silage without wilting. The developed equipment was able to dispense with wilting work and process high quality silage in an underground square silo (about 50m3).View full abstractDownload PDF (3222K) -
Akira MIZUSHIMA, Noboru NOGUCHI, Yousuke MATSUO2004 Volume 66 Issue 6 Pages 136-144
Published: November 01, 2004
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSRecently, there are many researches about GPS application for agriculture in the world. In this paper, the heading estimation method, using GPS alone, was proposed. In the developed algorithm, the system doesn't use the steering angle information. First, to evaluate the accuracy of direct heading measurement by GPS, straight and curve traveling test was conducted. As a result, the direct measurement included noise and time delay. Therefore, the heading estimation method by auto regression model was developed to overcome these problems. Consequently, 30% of accuracy in the straight travel test and 50% of accuracy in the curve travel test were improved.View full abstractDownload PDF (3724K) -
Michihisa IIDA, Yong YAO, Kazuyoshi NONAMI, Atsushi KIMURA, Toshikazu ...2004 Volume 66 Issue 6 Pages 145-151
Published: November 01, 2004
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSA grain flow rate sensor for a combine harvester was developed to measure the grain yield. This sensor installed at the end of a grain auger of a four-row heed-feeding combine detects the force that occurred when the grain flows into a grain tank. Indoor tests were conducted to determine the relationships between the sensor output signal and the grain flow rate using wheat and unhulled rice. The results showed that the coefficients of determination with respect to wheat and unhulled rice were 0.995 and 0.993, respectively. In addition, field tests were conducted to estimate the total grain mass harvested by the combine with the flow rate sensor. The sensor could determine the total grain mass at the coefficients of determination 0.945 and 0.986 in the case of wheat and rice.View full abstractDownload PDF (3107K)
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