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A. SASAO
2007 Volume 69 Issue 5 Pages
1-2
Published: September 01, 2007
Released on J-STAGE: November 17, 2011
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Yoh NISHIMURA
2007 Volume 69 Issue 5 Pages
4-7
Published: September 01, 2007
Released on J-STAGE: November 17, 2011
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Mitsuhiro HORIO, Hideyuki KONYA
2007 Volume 69 Issue 5 Pages
8-11
Published: September 01, 2007
Released on J-STAGE: November 17, 2011
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Jiro SASAKI
2007 Volume 69 Issue 5 Pages
12-16
Published: September 01, 2007
Released on J-STAGE: November 17, 2011
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Yasuyuki HIDAKA, Eiji KURIHARA
2007 Volume 69 Issue 5 Pages
17-20
Published: September 01, 2007
Released on J-STAGE: November 17, 2011
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Kazunobu HAYASHI
2007 Volume 69 Issue 5 Pages
21-24
Published: September 01, 2007
Released on J-STAGE: November 17, 2011
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S. MITANI
2007 Volume 69 Issue 5 Pages
25-26
Published: September 01, 2007
Released on J-STAGE: November 17, 2011
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K. OHHARA
2007 Volume 69 Issue 5 Pages
27-28
Published: September 01, 2007
Released on J-STAGE: November 17, 2011
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Estimation of Grass Chemical Composition Using Hyper-spectral Imaging Sensor
Yumiko SUZUKI, Katsuyuki TANAKA, Wataru KATO, Hiroshi OKAMOTO, Takashi ...
2007 Volume 69 Issue 5 Pages
43-51
Published: September 01, 2007
Released on J-STAGE: November 17, 2011
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A system was developed to estimate grass chemical composition values at the field level. Six important grass chemical compositions were estimated using a sensing system with a hyperspectral imaging sensor mounted on a tractor. Calibration models were obtained by using multiple linear regression, and accuracy was evaluated with three statistical analysis methods. These methods were the standard error of cross validation (
SECV), the coefficient of determination, and the
Bias used by cross-validation. The calibration models were evaluated the evaluation index (
EI). Results indicated good potential for the sensing system to estimate grass chemical composition.
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Local Features of Cultivation Technology for Irrigated Farming
Khoune SACKBOUAVONG, Masayuki KOIKE, Tomohiro TAKIGAWA
2007 Volume 69 Issue 5 Pages
52-61
Published: September 01, 2007
Released on J-STAGE: November 17, 2011
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This paper investigates specific features of cultivation technology for irrigated farming in regard to farm mechanization in Laos. Background issues related to current rice cultivation taking into account the changes caused by technology are discussed. It was found that growth in the use of the walking-type tractor employed for plowing and harrowing operations correlated with the growth of socio-economic conditions and the dissemination of basic technology. In addition, due to the progressive development of irrigation systems including the establishment of the Water Users' Association (WUA), three different modes of farm management determined by three respective categories of machine ownership were recognized. It was observed that those who do not own a cultivating machine tended to find the contract-hire service problematic because the contractor placed higher priority on his own farming needs rather than on those of the customer, sometimes preventing the customer's timely use of the cultivator. This dependence on machinery owned by others may indicate that the entrepreneurial drive has not yet fully-fledged in this rural community.
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Lenny SAULIA, Ho JINYAMA, Koji KITO, Nobutaka ITO
2007 Volume 69 Issue 5 Pages
62-69
Published: September 01, 2007
Released on J-STAGE: November 17, 2011
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The design and operation of tracked vehicles requires some knowledge of the mechanical behavior of soil under applied load. A well-known empirical model for sinkage prediction has been proposed and refined by Bekker (1960). In order to verify the accuracy of these empirical models, two sets of plates with similar load and contact area but different dimensions of length and width were employed and tested with a new pressure-sinkage measurement system equipped by a manipulator. The results of the tests show that the empirical model is not always accurate in application. This paper proposes a new method of predicting the sinkage of tracked vehicles with increased accurately, using a partially-linearized neural network. Due to the uncertainties of the values of soil and load parameters, a fuzzy prediction method using a neural network and a possibility function is proposed to express the distribution of the sinkage. The methods proposed in this paper are verified using empirical pressure-sinkage tests.
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Examination of a Cotyledon-Orienting Mechanism for Stocks
Ken KOBAYASHI, Sadao SASAYA
2007 Volume 69 Issue 5 Pages
70-77
Published: September 01, 2007
Released on J-STAGE: November 17, 2011
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We examined a cotyledon-orienting mechanism to develop an automatic seedling-feeding device for a semi-automatic grafting robot for cucurbitaceous vegetables. We subsequently manufactured three prototype cotyledon-orienting devices, a non-contact system that uses lasers, a contact system that uses a fixed fiat plate as the guide, and a combination of both systems. Accuracy tests were conducted by feeding pumpkin stocks. In the non-contact or contact system, we judged that it was difficult to achieve the accuracy (±35° from the specified direction) required for the cotyledon-orienting mechanism using the non-contact or contact system alone, as we proved in our first report. However, we successfully oriented cotyledons within 30° for the target direction by two-step processing of seedlings that combined both contact and non-contact systems.
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Toshinori KIMURA, Naoto SHIMIZU, Joko NUGROHO, Keisuke SATO
2007 Volume 69 Issue 5 Pages
78-87
Published: September 01, 2007
Released on J-STAGE: November 17, 2011
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In order to reduce the operation cost of composting process with forced air ventilation, this study investigated the effect of intermittent ventilation on composting. Experiments with a small-scale reactor system were conducted for several combinations of ventilation rate, ratio of ventilation period and resting period, and cycling time of intermittent ventilation.
The experiment results demonstrated that a relatively higher ventilation rate and specific combination of ventilation/resting ratio could provide more effective composting than continuous ventilation. The tendency of the results seemed reasonable from our previous analyses on composting with continuous ventilation.
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Measurement System and Map Production
Eiji MAKINO, Takao SUGIYAMA, Tomohiko ICHIKAWA, Kenji HAMADA, Michio K ...
2007 Volume 69 Issue 5 Pages
88-94
Published: September 01, 2007
Released on J-STAGE: November 17, 2011
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A prototype combine harvester with yield monitoring function was used to assess the basic performance requirements necessary for producing yield maps. The time-lags of the mass- and moisture measurement devices were both 15.0 seconds. The accuracy of the mass-measurement device was greatly improved by correcting the inclination measured with an inclination sensor installed near the load cell. Consequently, highly accurate calibration measurements were obtained for paddies and wheat (R≥0.99). In addition, the measurement of location was accurate to within 1m while harvesting. Yield and moisture maps were compiled after harvesting using data obtained from the prototype yield-monitoring combine harvester.
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Monitoring Yield and Map Production in Paddy and Wheat Fields
Eiji MAKINO, Takao SUGIYAMA, Tomohiko ICHIKAWA, Kenji HAMADA, Michio K ...
2007 Volume 69 Issue 5 Pages
95-103
Published: September 01, 2007
Released on J-STAGE: November 17, 2011
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The performance of a prototype combine harvester with yield monitoring function was measured while harvesting rice or wheat. The mass-measurement device was found to be highly accurate, with an associated error for 90% of the test samples being within 5% (maximum error<8%). The moisture-measurement device was also highly accurate (R=0.99, SEP=0.98 for rice; R=0.98, SEP=1.28 for wheat). Trials demonstrated that the prototype yield-monitoring combine harvester could be used obtain reliable cultivation management information by analyzing mass, moisture, and yield maps simultaneously.
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