研究者詳細 - 福田　英昭

論文 - 福田　英昭

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三原　信一郎,番匠谷　薫,村瀬　安英,

No.60 (2002/3) ( 琉球大学教育学部 ) ( 60 ) 77 - 83 2007年07月

掲載種別: 研究論文（大学，研究機関紀要）

To clarify the characteristics of corrosive wear of TiN coated high-speed steel tools in high moisture-content Douglas-fir (Pseudotsuga menziesii Franco) cutting, tool-life tests were conducted with a whirling disc-machine with four cutting speeds. The rake faces and the clearance faces of the tools were coated with TiN by physical vapor deposition (PVD) method, the thickness of thin-film for coated tool was 2-3 μm. In the tool-life tests for TiN coated tools and uncoated tools, the electrical-potential of +1kV, 0 V, or -1kV was applied to the tool by use of a direct-current power supply. The edge recession under 0 V for TiN coated tools progressed faster as cutting speed became faster, and progressed slightly faster than that of uncoated tools for each cutting speed. A little effect to lengthen the tool-life was recognized by coating the TiN. At the final cutting-length of 4 km, the edge recessions of both tools became the smallest under the cathode voltage of -1kV, due to the effect of cathodic protection, these values showed approximately 1/2-1/3 of those in normal cutting. The edge recessions of both tools became the largest under anode voltage of +1kV, these values showed approximately 4-5 times of those under zero voltage in normal cutting. The edge recessions for TiN coated tools under either cathode voltage or anode voltage became smaller than those of uncoated tools. The ratio of corrosive wear to the total edge recession under 0 V for uncoated tools was 45-60 %, and the value for TiN coated tools was 34-66 %. （管理者追加）リポジトリ登録情報を移行しました。確認のうえ、加除修正をしてください。

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DOI

沖縄県内中学校における木材加工実習室の実態調査 : 実習室のレイアウトおよび生徒の作業面積について

伊牟田　福太郎,

No.63 (2003/9) ( 琉球大学教育学部 ) ( 63 ) 125 - 141 2007年07月

掲載種別: 研究論文（大学，研究機関紀要）

To design a better practice room, and to obtain basic material to maintain the environment of study, we investigated by the questionnaire survey and taking pictures to understand the use state of a present woodworking practice room, and obtained the following conclusions. 1) The practice rooms were classified into four shape of a vertically long type, an oblong type, a square, and a special type (L-shaped type and so on) based on the position of the blackboard. In addition, we classified the practice rooms into three types by the state of arrangement of the woodwork machines. They were a length drawing type (the machines were drawn to the vertical direction in forward and the back) ,a horizontal drawing type (machines were drawn horizontally right and left) ,and a enclosure type (enclosed by setting up machines in the front, back, left and right) . The practice rooms were classified into 12 patterns in total. There were a lot of practice rooms where it is a vertically long type, and it was 79% of the investigation schools. And, the length drawing type was 48%, the horizontal drawing type was 17%, and the enclosure type was 35%. 2) The installation rates of the jigsaw, the wood drilling machine, and the belt sander were high, and those use rates were also high. On the other hand, the use ratio of wood lathe, band saw, and hand feed planer were low, and each use rate was 6%, 22%, and 33%. 235 machines were not being used among 656 total of the machine with the answer now, and it was a value of 36% of the entire machines. 3) The following answers were obtained as a reason why it was not used though the woodwork machine was set up. They were ""those machines were not used in the teaching material being taught now"", ""the machine is broken"", and ""the machine operation is dangerous"" and so on. If the woodwork machine is broken or the machine is not used by the reason of danger in the breakdown of the safety equipment, it is necessary to improve the machine immediately. 4) When one student practiced the woodwork, the work area needed was set to 3m^2. And the area needed to practice was subtracted from the area of present practice room at each school, and value R of the area of the remainder was calculated. When the correlation coefficient between the value of R and the number of students in one class was calculated, it became a value of -0.56, and was significant in the level of 1%. That is, the less the number of students in one class, the more a lot of work areas were secured for one student. （管理者追加）リポジトリ登録情報を移行しました。確認のうえ、加除修正をしてください。

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DOI

学校住環境における家具と児童の身体寸法の適合 : 机・椅子の号数変化による児童の意識および疲労の変化

上村　圭祐,

No.65 (2004/9) ( 琉球大学教育学部 ) ( 65 ) 107 - 115 2007年07月

掲載種別: 研究論文（大学，研究機関紀要）

A large number of studies have been made on the desk and chair viewed in ergonomic approach, but little is known about the matching between the measurement of child's body and the desk and chair in classroom. The purpose of this paper is to investigate the change in children's consciousness and tired. feeling according to the change in height of desks and chairs in classroom. The results obtained are summarized as: 1) The desks and chairs adjusted to proper size were not distributed among children, large size furniture were allotted to many children before the investigation. 2) Children evaluated that the proper size desks and chairs provided by the Japanese Industrial Standard were low. They hoped for the desks and chairs which height were higher than the proper size ones. 3) The desks and chairs of height at minus one level and proper size in JIS were bad evaluations from the consciousness investigation, such as ""ease of use"", ""calm"", ""comfort"", ""likes and dislikes"". On the other hand, the height at plus one, plus two and plus three level were good evaluations. Children hoped for higher desks and chairs from the viewpoint of consciousness. 4) The number of children who felt tiredness by lowering of the height of the desks and chairs had increased, and children felt a lot of tiredness in order of the back, the neck, the foot, the arm, and the waist. （管理者追加）リポジトリ登録情報を移行しました。確認のうえ、加除修正をしてください。