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Satoru Kato,Hironobu Ozeki,Hiroshi Yamada,Tomohiko Tagawa,Naoki Takahashi,Hirofumi Shinjoh 한국공업화학회 2013 Journal of Industrial and Engineering Chemistry Vol.19 No.3
A method for directly measuring gas diffusivity in a washcoat layer was established by preparing a simulated washcoat layer and modifying a Wicke–Kallenbach type counter-current diffusion cell. Three pairs of gases, N2–Ar, CO2–Ar and C3H8–Ar, were used in the measurements. It was found to be possible to evaluate the pore-transport parameters of the washcoat layer based on the mean transport pore model and the modified Stefan–Maxwell equation. Analysis of the gas diffusion mechanism in the washcoat layer showed that bulk and Knudsen diffusion took place simultaneously, and the percentage value of the contribution by Knudsen transport to net diffusion transport was evaluated.
Satoru YAMAGUCHI,Takuya MOTOSUGI,Ryo UCHIYAMA,Yoshihiko TAKAHASHI,Takeharu HAYASHI 제어로봇시스템학회 2019 제어로봇시스템학회 국제학술대회 논문집 Vol.2019 No.10
Global population growth and the ongoing climate crisis pose immense risk to the stable food supplies in the future. We have developed a small hydroponic plant cultivation system to ensure even in extreme circumstances. To build a sustainable system, we have utilized an LED lighting system together with conserved energy generated by sunlight. Such hydroponic plant cultivation systems have to operate at an affordable yet efficient principle. In this paper, we examine experimental results of the relationship between LED energy consumption and plant growth in a hydroponic plant cultivation system. LED light intensity directly correlates to electrical power consumed. Energy consumption is the result of electrical power consumed over a period of time. Three experiments with varying conditions utilizing constant electrical energy consumption were conducted. Case-1: Electric power is kept low and the lighting duration is long; Case-2: the electric power is set to medium and the lighting duration is medium; Case-3: the electric power is large and the lighting duration is short. As a result of evaluating the weight of grown lettuces, it was found that lettuce growth is excellent in Case-1. It means that the longer the LED irradiation duration, the better the plant growth even under the same energy consumption conditions.
Small Indoor Hydroponic System with Renewable Energy
Satoru YAMAGUCHI,Yoshihiko TAKAHASHI,Takeharu HAYASHI 제어로봇시스템학회 2018 제어로봇시스템학회 국제학술대회 논문집 Vol.2018 No.10
There is a concern about the food crisis due to worldwide population increase and the future rise in food prices. The United Nations has predicted that the world population will increase to 1.5 times current levels by 2100. It is therefore preferable to realize local food production for local consumption. We are developing a small indoor vegetable hydroponic system for household use, which uses sustainable energies, such as solar, wind, and hydrogen power. We have developed a hybrid energy control system with a fuel cell and a lead acid battery. The developed control system optimally switches the energy flow using a DCDC converter depending on the energy situation. We have conducted experiments using a small hydroponic system to determine the environmental situation of the lettuce cultivation process. This paper will explain the developed hybrid energy control system and the results of the vegetable growth process.
Yoshihiko TAKAHASHI,Takeharu HAYASHI,Yasunori TAKEMURA,Keigo HARA,Satoru YAMAGUCHI 제어로봇시스템학회 2019 제어로봇시스템학회 국제학술대회 논문집 Vol.2019 No.10
Many skills such as machine design, electronic circuit design, microcomputer programming are taught in mechatronics lectures at universities. Parts are given and students assemble the parts according to set examples. However, students cannot develop creativity simply by following fixed examples. In order to foster creativity, it is necessary to make mechatronic systems based on students’ own ideas. Students also need to study production costs, schedule management, team work etc. These skills are important when becoming engineers in companies after graduation. In order that students can use their own ideas, fabricate mechatronic systems, understand production costs, deal with deadlines and develop a team ethos, we have started a compact electric vehicle competition, named “pico-EV Eco Challenge”, and implemented it. In the competition, a one person small electric vehicle using only small rechargeable batteries (7.2V, 1000mAh in total) is fabricated and runs a 60m circuit. In this paper, the history, regulation and management of the competition, examples of participating vehicles, results and benefits of participation, etc. are discussed.
Multi-Beam Angle Sensor for Flatness Measurement of Mirror using Circumferential Scan Technology
Meiyun Chen,Satoru Takahashi,Kiyoshi Takamasu 한국정밀공학회 2016 International Journal of Precision Engineering and Vol.17 No.9
Flatness tolerance of mirror is usually determined for a particular manufactured product based on the user’s requirement. To help meet this requirement, we here propose a high-accuracy microscale flatness-measuring machine (micro-FMM) that consists of a multi-beam angle sensor (MBAS). We review the techniques and the sensors predominantly used in the industry to quantify flatness. Compared with other methods, the MBAS can eliminate zero-difference error by circumferential scan and automatically eliminates the tilt error caused by the rotation of a workpiece. Our optical probe uses the principle of an autocollimator, and the flatness measurement of the mirror comprises two steps. First, the MBAS is designed to rotate around a circle with a given radius. The workpiece surface profile along this trajectory is then measured by the micro-FMM. Experimental results, confirming the suitability of the MBAS for measuring flatness are also presented.
Narin Chanthawong,Satoru Takahashi,Kiyoshi Takamasu,Hirokazu Matsumoto 한국정밀공학회 2014 International Journal of Precision Engineering and Vol. No.
We developed a multi-Fabry-Pérot etalon (multi-FPE) for selecting high-frequency parts of repetition-frequency modes of a shortpulsemode-locked fiber laser at the wavelength of 1.55 mm. The 5-GHz repetition-modified laser beam is transmitted to a fiber-typeMichelson interferometer. The interference fringes exhibit a temporal coherence pattern and can be used for measuring spatialpositioning. The performance of CMM’s axis was determined directly from different positions of two interference fringes.
Shogo Shigeta,Satoru Nagase,Mikio Mikami,Masae Ikeda,Masako Shida,Isao Sakaguchi,Norichika Ushioda,Fumiaki Takahashi,Wataru Yamagami,Nobuo Yaegashi,Yasuhiro Udagawa,Hidetaka Katabuchi 대한부인종양학회 2017 Journal of Gynecologic Oncology Vol.28 No.6
Objective: The Japan Society of Gynecologic Oncology (JSGO) published the first practiceguideline for endometrial cancer in 2006. The JSGO guideline evaluation committee assessedthe effect of this guideline introduction on clinical practice and patient outcome using dataprovided by the Japan Society of Obstetrics and Gynecology (JSOG) cancer registration system. Methods: Data of patients with endometrial cancer registered between 2000 and 2012 wereanalyzed, and epidemiological and clinical trends were assessed. The influence of guidelineintroduction on survival was determined by analyzing data of patients registered between2004 and 2009 using competing risk model. Results: In total, 65,241 cases of endometrial cancer were registered. Total number ofpatients registered each year increased about 3 times in the analyzed period, and theproportion of older patients with type II endometrial cancer rapidly increased. The frequencyof lymphadenectomy had decreased not only among the low-recurrence risk group but alsoamong the intermediate- or high-recurrence risk group. Adjuvant therapy was integratedinto chemotherapy (p<0.001). Overall survival did not significantly differ before and afterthe guideline introduction (hazard ratio [HR]=0.891; p=0.160). Additional analyses revealedpatients receiving adjuvant chemotherapy showed better prognosis than those receivingadjuvant radiation therapy when limited to stage I or II (HR=0.598; p=0.003). Conclusion: It was suggested that guideline introduction influenced the managementof endometrial cancer at several aspects. Better organized information and continuousevaluation are necessary to understand the causal relationship between the guideline andpatient outcome.