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      • Material Models for Accurate Simulation of Sheet Metal Forming and Springback

        Fusahito YOSHIDA 한국소성가공학회 2010 기타자료 Vol.2010 No.6

        For anisotropic sheet metals, modeling of anisotropy and the Bauschinger effect is discussed in the framework of Yoshida-Uemori kinematic hardening model incorporating with anisotropic yield functions. The performances of the models in predicting yield loci, cyclic stress-strain responses on several types of steel and aluminum sheets are demonstrated by comparing the numerical simulation results with the corresponding experimental observations. From some examples of FE simulation of sheet metal forming and springback, it is concluded that modeling of both the anisotropy and the Bauschinger effect is essential for the accurate numerical simulation.

      • Reduction of Springback of Sheet Metals by Bottoming

        Takayuki Ogawa,Atsushi Hirahara,Fusahito Yoshida 한국소성가공학회 2010 기타자료 Vol.2010 No.6

        The effect of bottoming on the reduction of springback is investigated by performing V-air-bending experiment on a high strength steel sheet of TS590MPa and the corresponding FE simulation. From the experiment, it was found that the springback is drastically decreased with increasing bottoming force. This is mainly due to the reduction of bending moment by compressive load acting normally to the sheet. At an early stage of bottoming, springback is also influenced by the change of geometrical rigidity of the bent sheet due to the straightening of ridge line warp. Since bottoming is a process of reverse deformation of tension-compression, the Bauschinger effect of materials should be taken into account for its accurate numerical simulation. 3D FE simulation using Yoshida-Uemori kinematic hardening model predicts well the bottoming effect.

      • Elasto-Plasticity Behavior of Type 5000 and 6000 Aluminum Alloy Sheets and Its Constitutive Modeling

        Shohei TAMURA,Satoshi SUMIKAWA,Hiroshi HAMASAKI,Takeshi UEMORI,Fusahito YOSHIDA 한국소성가공학회 2010 기타자료 Vol.2010 No.6

        To examine the deformation characteristic of type 5000 and 6000 aluminum alloy sheets, uniaxial tension, biaxial stretching and in-plane cyclic tension-compression experiments were performed, and from these, r-values (r?, r45 and r90), yield loci and cyclic stress-strain responses were obtained. For the accurate description of anisotropies of the materials, high-ordered anisotropic yield functions, such as Gotoh’s biquadratic yield function and Barlat’s Yld2000-2d, are necessary. Furthermore, for the simulation of cyclic behavior, an advanced kinematic hardening model, such as Yoshida-Uemori model (Y-U model), should be employed. The effect of the selection of material models on the accuracy of the springback prediction was discussed by performing hat bending FE simulation using several yield functions and two types of hardening laws (the isotropic hardening model and Y-U model)

      • KCI등재

        MAGNETIC PROPERTIES OF $FePt_{3}$ ORDERED ALLOY

        Yoshida, H.,Fujimori, H.,Kaneko, T.,Abe, S.,Watanabe, K.,Matsumoto, M.,Yoshida, T.,Kanomata, T. The Korean Magnetics Society 1995 韓國磁氣學會誌 Vol.5 No.5

        The magnetic properties for $Fe_{24}Pt_{76}\;and\;Fe_{26}Pt_{74}$ have been investigated. The temperature vs. magnetic susceptibility curve for $Fe_{24}Pt_{76}$ had no peak near the Neel temperature. The magnetization proccess at 4.2 K showed only a linear variation up to the high magnetic field of 240 kOe. That for $Fe_{26}Pt_{74}$ at 77 K showed a metamagnetic transition at 100 kOe. These properties were discussed on the basis of a band picture.

      • KCI등재

        MAGNETIC PROPERTIES OF FePt₃ ORDERED ALLOY

        H.Yoshida,H.Fujimorl,T.Kaneko,S.Abe,K.Watanabe,M.Matsumoto,T.Yoshida,T.Kanomata 한국자기학회 1995 韓國磁氣學會誌 Vol.5 No.5

        The magnetic properties for Fe₂₄Pt_(76) and Fe_(26)Pt_(74) have been investigated. The temperature vs. magnetic susceptibility curve for Fe₂₄Pt_(76) had no peak near the Neel temperature. The magnetization process at 4.2 K showed only a linear variation up to the high magnetic field of 240 kOe. That for Fe_(26)Pt_(74) at 77 K showed a metamagnetic transition at 100 kOe. These properties were discussed on the basis of a band picture.

      • Interrogative Feature Checking in Japanese and Korean

        ( Keiko Yoshida ),( Tomoyuki Yoshida ) 한국언어정보학회 1996 국제 워크샵 Vol.1996 No.-

        This paper discusses the feature checking mechanism of interrogative sentences in Japanese and Korean. We first focus on a phenomenon of omitting question markers in informal speech in Japanese and attempt to provide an account for it within the framework of Principles and Parameters approach. We argue that question markers can be omitted only if interrogative features of the sentence can be properly checked. In particular we claim that I-to-C head-movement is one of the options for interrogative feature checking in Japanese as well as languages without question markers. A close examination of Korean reveals certain differences between Korean and Japanese. Some theoretical consequences from this analysis are also discussed.

      • KCI등재

        近代日本の初等学校国定教科書における赤穂事件研究 - 国定修身教科書と乃木希典 -

        YOSHIDA YUKO 한국일본어문학회 2016 日本語文學 Vol.1 No.71

        The “Ako incident” that occurred in the Genroku era was transformed into a work called “Chushingura”, it played a significant role as a symbol to stimulate Japanese loyalty. This paper examines how the classical literary work “Chushingura” and “Ako incident” are described in the national textbook of the first half of the twentieth century to learn about Japanese imperialism. 本論文では、武士社会に存在していた忠誠心を象徴的に示す"赤穂事件"と、それをもとにした創作物である『忠臣蔵』という古典文学作品が、帝国主義に進んでいた20世紀前半の日本の小学校の教科書でどのように取り上げられてどのように活用されたかを考察したものである。調査結果によると、近代日本の教育政策は、国定教科書を通して主君に忠誠を尽くす武士社会の伝統的な忠誠心(小義)を家族国家の天皇への忠誠心(大義)に転換させた。その中心人物は、乃木大將(乃木希典)であった。"赤穂事件"を主導した大石良雄は"赤穂事件"に内包された反逆という政治的な問題のために<國語> <國史>教科書には登場したが、<修身>教科書には登場しなかった。しかし、国民学校体制に変わった1941年に発行された第5期<修身>教科書では、これを乃木大將の忠誠心(大義)と結びつけて近代的な忠誠心を誘導したのである。國民学校教育では、"赤穂事件"、『忠臣蔵』はすべての科目に記述され「国民科」の複数の科目に適用することで、強力な「皇国臣民育成」を推進したといえる。

      • Comparison of Preschooler's Exercise Intensity at Kindergarten and at Home

        YOSHIDA Izumi 아시아아동지원학회 2015 아시아아동지원연구 Vol.6 No.-

        '스콜라' 이용 시 소속기관이 구독 중이 아닌 경우, 오후 4시부터 익일 오전 7시까지 원문보기가 가능합니다.

      • SCIESCOPUS

        Particle filter for model updating and reliability estimation of existing structures

        Yoshida, Ikumasa,Akiyama, Mitsuyoshi Techno-Press 2013 Smart Structures and Systems, An International Jou Vol.11 No.1

        It is essential to update the model with reflecting observation or inspection data for reliability estimation of existing structures. Authors proposed updated reliability analysis by using Particle Filter. We discuss how to apply the proposed method through numerical examples on reinforced concrete structures after verification of the method with hypothetical linear Gaussian problem. Reinforced concrete structures in a marine environment deteriorate with time due to chloride-induced corrosion of reinforcing bars. In the case of existing structures, it is essential to monitor the current condition such as chloride-induced corrosion and to reflect it to rational maintenance with consideration of the uncertainty. In this context, updated reliability estimation of a structure provides useful information for the rational decision. Accuracy estimation is also one of the important issues when Monte Carlo approach such as Particle Filter is adopted. Especially Particle Filter approach has a problem known as degeneracy. Effective sample size is introduced to predict the covariance of variance of limit state exceeding probabilities calculated by Particle Filter. Its validity is shown by the numerical experiments.

      • Development of the readout system for the K2K SciBar detector

        Yoshida, M.,Yamamoto, S.,Murakami, T.,Tanaka, M.,Nakaya, T.,Nishikawa, K.,Joo, K.K.,Kim, B.J.,Kim, J.Y.,Kim, S.B.,Lee, M.J.,Lim, I.T. IEEE 2004 IEEE transactions on nuclear science Vol.51 No.6

        Readout electronics for the scintillation bar tracking detector (SciBar) in the K2K neutrino oscillation experiment has been developed. SciBar has 14 336 scintillator bars in total. The deposited energy and timing of particles from neutrino interactions in the scintillator bars are measured by 64-channel multianode photo-multiplier tubes (MAPMTs). Compact custom-designed electronics to record the MAPMT signals were developed, consisting of front-end circuit boards attached to each MAPMT and back-end electronics modules sitting in a VME crate. The front-end circuit board multiplexes pulse-height information from all 64 anodes and generates a fast triggering signal. Two sets of ASICs (IDEAS VA32HDR11 and TA32CG) are employed for these functions. The bias voltages and relay of control signals are also handled on the board. The back-end electronics module controls the front-end board by providing the control, timing, and low-voltage signals. The board also digitizes the multiplexed signal from the front-end. The electronics achieves low noise of less than 0.3 photo-electrons and good linearity up to 300 (150) photo-electrons for MAPMTs at the gain of 5×10<SUP>5</SUP> (10<SUP>6</SUP>).

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