著者

Ronnie S. Concepcion II Sandy C. Lauguico Jonnel D. Alejandrino Argel A. Bandala Edwin Sybingco Ryan Rhay P. Vicerra Elmer P. Dadios Joel L. Cuello

出版者

Fuji Technology Press Ltd.

雑誌

Journal of Advanced Computational Intelligence and Intelligent Informatics (ISSN:13430130)

巻号頁・発行日

vol.25, no.5, pp.610-617, 2021-09-20 (Released:2021-09-20)

参考文献数

27

被引用文献数

28

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Sustainability is a major challenge in any plant factory, particularly those involving precision agriculture. In this study, an adaptive fertigation system in a three-tier nutrient film technique aquaponic system was developed using a non-destructive vision-based lettuce phenotype (VIPHLET) model integrated with an 18-rule Mamdani fuzzy inference system for nutrient valve control. Four lettuce phenes, that is, fresh weight, chlorophylls a and b, and vitamin C concentrations as outputted by the genetic programming-based VIPHLET model were optimized for each growth stage by injecting NPK nutrients into the mixing tank, as determined based on leaf canopy signatures. This novel adaptive fertigation system resulted in higher nutrient use efficiency (99.678%) and lower chemical waste emission (14.108 mg L-1) than that by manual fertigation (92.468%, 178.88 mg L-1). Overall, it can improve agricultural malpractices in relation to sustainable agriculture.

著者

Keita Abe Yumeta Seki Yu Kuwajima Ayato Minaminosono Shingo Maeda Hiroki Shigemune

出版者

Fuji Technology Press Ltd.

雑誌

Journal of Robotics and Mechatronics (ISSN:09153942)

巻号頁・発行日

vol.34, no.2, pp.351-360, 2022-04-20 (Released:2022-04-20)

参考文献数

29

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In recent years, untethered soft robots, free of the lines that restrict their mobility, have been studied extensively. Our research team has been focusing on the electrohydrodynamic phenomena (EHD) as a driving mechanism for untethered robots. EHD is a phenomenon in which a flow is generated by applying a high voltage to a dielectric liquid. We propose a method to drive a robot in an untethered manner using EHD by vertically stacking two types of liquids: conductive and dielectric. This method is simpler, more energy-efficient, and quieter than conventional systems. Although a lower voltage would prevent the enlargement of the system by limiting the electronic components, the generation of EHD requires a high voltage. Therefore, in this study, to realize the low voltage drive of untethered robots dominated by the electrostatic actuator, we tackled the reduction of the driving voltage by investigating the phenomenon. As a result, we achieved low voltage driving at 15 V and successfully drove with off-the-shelf batteries (18 V). We also investigated the output current flowing through the system to reduce power consumption. Therefore, in addition to improving the energy efficiency of the system, we confirmed that the difference of the generated current depended on the thickness of the dielectric liquid and the concentration of the conductive liquid.

著者

Ya-Fen Ye Chao Ying Yue-Xiang Jiang Chun-Na Li

出版者

Fuji Technology Press Ltd.

雑誌

Journal of Advanced Computational Intelligence and Intelligent Informatics (ISSN:13430130)

巻号頁・発行日

vol.21, no.6, pp.1017-1025, 2017-10-20 (Released:2018-11-20)

参考文献数

23

被引用文献数

3

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In this study, we focus on the feature selection problem in regression, and propose a new version of L1 support vector regression (L1-SVR), known as L1-norm least squares support vector regression (L1-LSSVR). The alternating direction method of multipliers (ADMM), a method from the augmented Lagrangian family, is used to solve L1-LSSVR. The sparse solution of L1-LSSVR can realize feature selection effectively. Furthermore, L1-LSSVR is decomposed into a sequence of simpler problems by the ADMM algorithm, resulting in faster training speed. The experimental results demonstrate that L1-LSSVR is not only as effective as L1-SVR, LSSVR, and SVR in both feature selection and regression, but also much faster than L1-SVR and SVR.

著者

Ryota Murakami Takumi Toyoshima Daichi Furusawa Masaru Suzuki Kazunari Masumoto Sho Owada Yuichi Tsumaki Kyoichi Mori

出版者

Fuji Technology Press Ltd.

雑誌

Journal of Robotics and Mechatronics (ISSN:09153942)

巻号頁・発行日

vol.33, no.3, pp.475-483, 2021-06-20 (Released:2021-06-20)

参考文献数

16

被引用文献数

3

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The biologging approach of attaching a logger to the body of an animal provides information that cannot be obtained by conventional direct visual observation. Marine zoologists have used this technique for observing sperm whales preying on giant squids in the deep sea. However, it is almost impossible to capture a sperm whale to attach a logger, because of its large size. Therefore, researchers have used a long pole to attach a logger from a ship to the back of sperm whales. Unfortunately, this method is risky and requires a skilled team. In this paper, we propose a logger attaching system using a drone to solve this problem. The proposed method can be trained on land; thus, it is relatively easy to train a team, and the mobility of the drone can shorten the installation time. Several pieces of equipment developed for the proposed method are described in detail. Furthermore, field experiments were performed with sperm whales to confirm the feasibility of the system. A suction cup of the seventh prototype of the whale rover was adsorbed onto the back of a sperm whale. Although a complete installation was not possible, it was demonstrated that operation was possible in a short time using the proposed method.

著者

Yoshiyuki Okada Keisuke Ikeda Kosuke Shinoda Fujio Toriumi Takeshi Sakaki Kazuhiro Kazama Masayuki Numao Itsuki Noda Satoshi Kurihara

出版者

Fuji Technology Press Ltd.

雑誌

Journal of Advanced Computational Intelligence and Intelligent Informatics (ISSN:13430130)

巻号頁・発行日

vol.18, no.4, pp.598-607, 2014-07-20 (Released:2019-07-01)

参考文献数

11

被引用文献数

11

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Nowadays, users of Twitter, one of famous social networking service, have rapidly increased in number, and many people have been exchanging information by Twitter. When the Great East Japan Earthquake struck in 2011, people were able to obtain information from social networking services. Though Twitter played an important role, one problem was especially pointed out: false rumor diffusion. In this study, we propose an information diffusion model based on the SIR model and discuss how to prevent false rumor diffusion.

著者

Miko Maekawa Priyatma Singh Dhrishna Charan Nagisa Yoshioka Takuia Uakeia

出版者

Fuji Technology Press Ltd.

雑誌

Journal of Disaster Research (ISSN:18812473)

巻号頁・発行日

vol.14, no.9, pp.1277-1286, 2019-12-01 (Released:2019-12-01)

参考文献数

23

被引用文献数

3

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People from Kiribati, especially after obtaining college degrees, tend to have a desire to migrate abroad to obtain further education and good jobs and, to some extent, due to the impacts of climate change. Nineteen percent of I-Kiribati migrants in Fiji who responded to our survey indicated climate change as a factor for their migration, but their primary reasons were to seek better education and employment. When seeking employment, their lack of English-language skills and professional qualifications posed challenges. However, those who had prepared well in advance tend to find jobs relatively smoothly after migration. When settling in a new area, people tended to rely on family connections, community groups, and other social supports as sources of network and safety net.

著者

Changxing Fan

出版者

Fuji Technology Press Ltd.

雑誌

Journal of Advanced Computational Intelligence and Intelligent Informatics (ISSN:13430130)

巻号頁・発行日

vol.23, no.3, pp.421-426, 2019-05-20 (Released:2019-05-20)

参考文献数

22

被引用文献数

5

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The paper presents the correlation coefficient of refined-single valued neutrosophic sets (Refined-SVNSs) based on the extension of the correlation of single valued neutrosophic sets (SVNSs), and then a decision making method is proposed by the use of the weighted correlation coefficient of Refined-SVNSs. Through the weighted correlation coefficient between the ideal alternative and each alternative, we can rank all alternatives and the best one of all alternatives can be easily identified as well. Finally, to prove this decision making method proposed in this paper is useful to deal with the actual application, we use an example to illustrate it.

著者

Makoto Matsubara Hiroshi Sato Kenji Uehira Masashi Mochizuki Toshihiko Kanazawa

出版者

Fuji Technology Press Ltd.

雑誌

Journal of Disaster Research (ISSN:18812473)

巻号頁・発行日

vol.12, no.5, pp.844-857, 2017-10-01 (Released:2018-11-01)

参考文献数

34

被引用文献数

20

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Tomographic analysis of the seismic velocity structure beneath oceans has always been difficult because offshore events determined by onshore seismic networks have large uncertainties in depth. In order to use reliable event locations for our computations, we have developed a method to use the hypocentral depths determined by the NIED F-net with moment tensor solutions using long-period (20-50 s) waves from offshore events away from onshore seismic networks. We applied seismic tomographic method to events occurring between the years 2000 and 2015 to generate a tomographic image of the Japanese Islands and the surrounding using travel time data picked by the NIED Hi-net, hypocenteral information for onshore earthquakes from the Hi-net, and hypocenter information for offshore events from the F-net. The seismic velocity structure at depths of 30-50 km beneath the Pacific Ocean off the east coast of northeastern Japan and onshore Japan was clearly imaged using both onshore and offshore event date. The boundary between high and low P-wave velocities (Vp) is clearly seen at the Median Tectonic Line beneath southwestern Japan at depths of 10 and 20 km. We discuss how the high-Vp lower crust and low-Vp upper crust beneath central Japan and towards the Sea of Japan are responsible for the failed rift structures formed during the opening of the Sea of Japan. Due to consequent shortening, the crustal deformation has been concentrated along the failed rift zone. Resolution of shallow structures beneath the ocean is investigated using S-net data, confirming the possibility of imaging depths of 5-20 km. In future studies, application of S-net data will be useful in evaluating whether the failed rift structure, formed during the late Cretaceous to early Tertiary, continues towards the shallow regions beneath the Pacific Ocean.

著者

Michimasa Matsumoto

出版者

Fuji Technology Press Ltd.

雑誌

Journal of Disaster Research (ISSN:18812473)

巻号頁・発行日

vol.13, no.6, pp.1125-1141, 2018-11-01 (Released:2018-11-01)

参考文献数

27

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As of spring 2018, evacuation orders have been lifted from the entire area of Naraha Town and most of Tomioka, except for certain areas. While many evacuees have chosen their evacuation destinations as their permanent residences, some have returned to their former towns. This paper examines the factors involved in the “differentiation” and “integration” of Naraha and Tomioka residents before and after the disaster and the various forms they assume, based on the results of questionnaire surveys conducted in 2012 and 2015 as well as interviews conducted on a continuing basis since the disaster. In this process, it has become apparent that a split exists between Naraha, whose residents are moving toward “integration” with the lifting of the evacuation order, and Tomioka, whose residents are progressing toward “differentiation.”

著者

Miki Ozeki Kan Shimazaki

出版者

Fuji Technology Press Ltd.

雑誌

Journal of Disaster Research (ISSN:18812473)

巻号頁・発行日

vol.13, no.1, pp.199-204, 2018-02-20 (Released:2018-10-01)

参考文献数

19

被引用文献数

1

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The aim of the current study was to test whether direct experience of a large-scale natural disaster enhanced disaster-prevention consciousness, using the disaster-prevention consciousness scale created by Shimazaki and Ozeki (2017). An online survey was conducted in February 2017 targeting those who lived in Kumamoto Prefecture, which was seriously damaged by the Kumamoto Earthquake. Participants were divided into two groups: a group of people who lived in 14 local towns where public employees of other local governments came to provide backup assistance after the Kumamoto Earthquake (heavily damaged group), and a group of people who did not live in these areas when the Kumamoto Earthquake occurred (damaged group). Results showed that interest in disasters, sense of danger in current disaster prevention, others orientation, and anxiety increased after large-scale natural disasters, irrespective of the extent of damage. Directly experiencing damage from the disaster enhanced imagination for damage situation.