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Shin Usuki,Hiroyoshi Kanaka,Kenjiro Takai Miura 한국정밀공학회 2013 International Journal of Precision Engineering and Vol. No.
Microscopic imaging is convenient, nondestructive, and has a high-throughput performance and compatibility with a number of applications. However, the spatial resolution of conventional light microscopy is limited to wavelength scale and the depth of field is extremely shallow; hence, it is difficult to obtain detailed 3D spatial data of the object to be measured. In this paper, we propose a new technique for generating and controlling 3D standing wave illumination based on the 3D interference of multiple laser beams. The proposed technique has possibility to provide lateral and axial resolution improvement as well as a wide 3D field of view. The spatial configuration of the interference beams was theoretically examined and the optimal incident angle of the multiple beams was confirmed. Numerical simulations were carried out and confirmed the generation of 3D standing wave illumination and spatial control of the illumination by using the phase shift of incident beams. Furthermore, we develop an experimental apparatus to demonstrate the generation of 3D standing wave illumination by four beam interference and spatial control with a piezoelectric transducer. Finally, basic experiments were performed using nanospheres to verify the generation, spatial intervals, and controllability of the phase shift of 3D standing wave illumination.
Development of SVC Control for Suppressing Voltage Fluctuations
Kazuhiro Usuki,Fumio Aoyama,Masayoshi Hanamatsu 전력전자학회 2011 ICPE(ISPE)논문집 Vol.2011 No.5
This paper describes control methods for a line-commutated static var compensator (SVC) and a self-commutated SVC to suppress voltage fluctuations of electric arc furnaces (EAFs) for steel making. In these control methods, the line-commutated SVC and the self-commutated SVC compensate for the fluctuations of the reactive power effectively within their respective rated capacities. This paper also presents practical examples of both SVCs for suppressing voltage fluctuations. In the actual operation of EAFs and SVCs, the authors verified that each SVC effectively suppressed the voltage fluctuations at the point of common coupling.
Tadashi Usuki,Ching-Ying Lan,Tzen-Fu Yui,Yoshiyuki Iizuka,Van Tich Vu,Tuan Anh Tran,Kazuaki Okamoto,Joseph L. Wooden,Juhn G. Liou 한국지질과학협의회 2009 Geosciences Journal Vol.13 No.3
To constrain the timing of collisional event in the Indochina block, SHRIMP U–Pb dating and REE analyses of zircon were carried out for two paragneiss samples of the Kham Duc Complex, central Vietnam. Both samples contain kyanite, staurolite, and zoisite as relics from an early metamorphic stage (M1), and biotite and sillimanite as major minerals constituting the foliation formed during the late metamorphic stage (M2). The change in mineral assemblages indicates a clockwise P-T path composed of a high- or medium-P + low-T stage (M1) and a subsequent low-P + high-T stage (M2). The U−Pb concordia ages of zircon rims are 447 ± 6 Ma and 452 ± 6 Ma for the two samples, respectively. These results are distinctly different from the available Ar–Ar mineral ages of 254–225 Ma. Following the clockwise P-T path and phase equilibrium analyses of the Complex, we suggest that the zircon rims were formed near peak temperatures during the decompression. The ~450 Ma zircon rim thus gives the minimum age constraint for a possible crustal thickening event during Early Paleozoic, whereas the reported Permo-Triassic Ar–Ar ages would result from an Indosinian overprint. This Early Paleozoic event is most likely related to a collisional orogeny between the Indochina and South China blocks. Late Neoproterozoic to Neoarchean ages are recorded from detrital zircon cores of the Kham Duc Complex, the Kontum Massif and Truong Son Belt, suggesting that their protoliths might have derived from sediments at the Gondwana margin.
NAKAMOTO Mio,USUKI Tomomi,ITO Miwa 아시아장애사회학회 2011 아시아장애사회학연구 Vol.11 No.-
The present study focuses on how to mutually engage and apply hand massage in an effective manner from the view points of therapist about applying hand massage and information obtained from patients, and proposes a method for the same. To be more precise, in order to build a hand massage method for elderly people with dementia, three cases ofhand massage conducted between June 2010 and May 2011 (distinctive cases in the initial stage of hand massage) are described, progress notes recorded in video or episode are exp1ained, and therapists’ way of engaging and his viewpoints are elucidated. In addition, from this viewpoint of engaging with therapist, we have derived and proposed a method of hand massage in the initial stage of therapy for elderly people with dementia. It also came to light that viewpoint of interpersonal assistance, which is the basic skill of social work, is also necessary.
Robot Trajectory Generation with Smoothly Changing Curvature Using the Clothoid Spline
Dai Shibuya,Shin Usuki,Kenjiro T. Miura (사)한국CDE학회 2013 한국CAD/CAM학회 국제학술발표 논문집 Vol.2010 No.8
In this paper we propose optimization methods for trajectory design using the clothoid spline, which consists of several clothoid curve segments with some parametric or geometric continuity, in two-dimensional space. As a trajectory path, the clothoid curve is superior to other ones because its curvature varies linearly with its arc length. However, a single clothoid segment cannot generally satisfies both tangent and curvature conditions at its end points because the number of parameters, i.e. its degree of freedom is insufficient. In order to solve the problem mentioned above, “the triple-clothoid”[1], which is a clothoid spline consisting of three clothoid segments, was introduced to match both tangent and curvature boundary conditions. It has sufficient parameters needed for tangent and curvature matching at its end point. The clothoid spline with three segments were used to construct a smooth transition passing through arbitrary point sequence. The resultant trajectory possesses curvature continuity, i.e. G2 continuity and matches all tangent and curvature specifications at the giving points. However, the clothoid spline with three segments that passes through specified points is not uniquely determined. Therefore we propose optimization methods to minimize the trajectory path length and an energy consumption measure in this paper.
Detrital zircon evidence for the antiquity of Taiwan
Ching-Ying Lan,Tadashi Usuki,Kuo-Lung Wang,Tzen-Fu Yui,Kazuaki Okamoto,Yuan-Hsi Lee,Takafumi Hirata,Yoshitaka Kon,Yuji Orihashi,Juhn G. Liou,Chun-Sun Lee 한국지질과학협의회 2009 Geosciences Journal Vol.13 No.3
In-situ U–Pb geochronology and Hf isotopic studies of zircons from the Pre-Tertiary basement complex and Eocene rocks of the Central Range of Taiwan were carried out to elucidate the history of detrital zircons older than 2.3 Ga. Zircons from the eastern Backbone Range and Eastern Central Range show Paleoproterozoic to late Neoarchean ages (2.3 –³2.5 Ga), whereas those from the Hsuehshan Range yield Neoarchean to Mesoarchean ages (2.6–3.2 Ga). The εHf(T) for the Paleoproterozoic to late Neoarchean zircons varies from –7.4 to +5.1, implying both juvenile crustal growth and reworking of old crusts. This dual origin could extend back to Mesoarchean–Paleoarchean (3.0–3.4 Ga) based on Hf isotopic model ages. Consistent but narrower εHf(T) values and Hf crustal model ages for zircons from Taiwan compared to Cathaysia suggest a possible common origin for these zircons, although Taiwan has a generally younger crustal evolution history than SE China.
τ-curve: introduction of cusps to aesthetic curves
Kenjiro T. Miura,Sho Suzuki,Shin Usuki,R.U. Gobithaasan 한국CDE학회 2020 Journal of computational design and engineering Vol.7 No.2
Yan, Schiller, Wilensky, Carr, and Schaefer pointed out that one of the demerits of clothoid interpolation is a jumping behavior during the deformation of the curve. This phenomenon occurs because the clothoid curve cannot have a cusp, where the curve is kinked or the direction of the curve is abruptly changed. We discuss how to introduce cusps for the log-aesthetic curve including the clothoid curve and propose to use for the representation of a curve the direction angle instead of curvature and define a new curve named τ-curve, which is defined by the direction angle of the curve.
Minimum variation log-aesthetic surfaces and their applications for smoothing free-form shapes
Suzuki, Sho,Gobithaasan, R.U.,Salvi, Peter,Usuki, Shin,Miura, Kenjiro T. Society for Computational Design and Engineering 2018 Journal of computational design and engineering Vol.5 No.2
The log-aesthetic curve, which includes the logarithmic (equiangular) spiral, clothoid, and involute of a circle, achieves a control over curvature distribution by defining its shape as an integral form of its curvature and they are expected to be utilized for the field of design. However, it is very difficult to extend it to surfaces and the existing formulations have some problems that they cannot use arbitrary boundary curves. In this paper, we propose ''minimum variation log-aesthetic surface" as a new formulation for the log-aesthetic surface. Based on variational principle our method can generate surfaces by minimizing the objective function newly proposed in this paper for given arbitrary boundary curves.