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Ken-ichi Hirashima,Keiji Sato,Takashi Tsutsumi,Hiroshi Arai 국제구조공학회 2002 Steel and Composite Structures, An International J Vol.2 No.4
In this paper, the solution of a semi-infinite plane with one circular hole is presented. This solution is induced by repeatedly superposing the solution of an infinite plane with one circular hole and that of a semi-infinite plane without holes to cancel out the stresses arising on both boundaries. This procedure is carried out until the stresses arising on both boundaries converge. This method does not require complicated calculation procedures as does the method using stress functions defined in a bipolar coordinate system. Some numerical results are shown by graphical representations.
아몰퍼스 FeCoSiB 박막의 고감소 스트레인 검출특성
신광호,Arai, Ken Ichi,사공건 한국센서학회 2000 센서학회지 Vol.9 No.1
Amorphous FeCoSiB films with high saturation magnetostriction and excellent soft magnetic properties have been studied to evaluate their strain sensitivity. Films were subjected to a strain by bending of their substrates, which caused a change in the magnetic anisotropy of films via magnetoelastic coupling. Films were exhibited a figure of merit F=(Δμ/μ)/ε (change in film permeability μ per unit strain ε) of 1.2 x 10^5, which is comparable with that of amorphous ribbons. To make a study of application of magnetostrictive films as strain sensor elements, we have prepared a micro-patterned film by means of the photolithography and ion milling processes. Impedance change in the patterned films, when strain was applied, was measured over the frequency range from 1 MHz to 1 GHz. Reflecting a large value of figure of merit F, a variation of 46% impedance of films was shown at 100 MHz frequency when a strain of 300 x 10^(-6) was applied.
Sin, Gwang-Ho,Arai, Ken-Ichi,Sa-Gong, Geon 대한전기학회 2000 전기학회논문지C Vol.49 No.5
This paper presents a study on the linear compensation of nonlinear hysteric actuators using the highly magnetostrictive film pattern as a strain sensor. Elements had a hybrid structure, in which thin soft glass substrate with the highly magnetostrictive amorphous FeCoSiB film was bonded on the PZT piezoelectric substrate. The magnetostrictive film as a strain sensor detects the deflection of an actuator, and a voltage signal from the strain sensor related to the deflection of an actuator is used for the linear control of an actuator.
Magnetic Wireless Actuator for Medical Applications
Kazushi Ishiyama,Masahiko Sendoh,Aya Yamazaki,Ken Ichi Arai 한국자기학회 2003 Journal of Magnetics Vol.8 No.1
The largest advantage of magnetic micromachine is wireless operation. This advantage makes it suitable for medical micromachine working inside the human body. In the medical field, low invasion treatment is very important. From this point of view, very small machines working in the body without power supply cables meet the needs of the medical field. In this paper, we report about magnetic wireless actuators for medical applications.