SIMULATION SYSTEM FOR IMPROVING TENNIS STROKE MOTION

The purpose of this study was to construct a system that can simulate tennis stroke motion for competition level enhancement of players. To do so, 10 female tennis club players (1 9- 23 years old) of University of Tsukuba were selected for a biomechanics study using three-dimensional stroke motion analysis method, in a total of 10 trials. Using obtained results on joint angles of the whole body, the best results of university tournament and racket head speed at impact, a database was constructed. Principal component analysis was used to classify the motion patterns into the principal component scores. Based on the principal component score and optimization theory, we generated a simulation system to predict competition level and racket head speed, and thus a new stroke motion, which can be expressed using 30 animations

Electron Spin Resonance Study on Irradiated Styrene in Crystalline and Glassy States

Styrene was irradiated at-196°C to give a five-line spectrum with a coupling constant of about 16 gauss. This is attributed to the free radical When a mixture of styrene and 2-methyltetrahydrofuran was irradiated, a broad singlet spectrum (total width 33 gauss) was superposed on the seven-line spectrum due to the methyltetrahydrofuran radical and no sharp singlet spectrum due to trapped electrons was observed. This broad singlet spectrum is thought to be due to styrene anion radicals. This spectrum was bleached by visible light and saturated appreciably with increasing microwave power. Similar phenomena were observed for a styrene-3-methylpentane mixture

Terahertz wireless communication in a 560-GHz band using a Kerr micro-resonator soliton comb

Terahertz (THz) waves have attracted attention as carrier waves for next-generation wireless communications (6 G). Electronic THz emitters are widely used in current mobile communications; however, they may face technical limitations in 6 G with upper-frequency limits. We demonstrate wireless communication in a 560-GHz band by using a photonic THz emitter based on photomixing of a 560-GHz-spacing soliton microcomb in a uni-travelling carrier photodiode together with a THz receiver of Schottky barrier diode. The on-off keying data transfer with 2-Gbit/s achieves a Q-factor of 3.4, thus, satisfying the limit of forward error correction

Wireless data transmission in a 560-GHz band using low-phase-noise terahertz wave generated by photomixing of a pair of distributed feedback lasers injection-locking to Kerr micro-resonator soliton comb

The demand for higher data rates in next-generation mobile wireless communication systems (6G) has led to significant interest in terahertz (THz) waves as a high-frequency, broad modulation bandwidth carrier wave. In this study, we propose and demonstrate a wireless data transfer in the 560-GHz band using low-phase-noise THz waves generated by photomixing of a pair of distributed feedback lasers injection-locking to Kerr micro-resonator soliton comb. Experimental results showed near-error-free on-off keying (OOK) data transfer at 1 Gbit/s in the 560-GHz band, with a Q-factor of 6.23, surpassing the error-free limit. Also, modulation formats of binary phase shift keying (BPSK) and quadrature phase shift keying (QPSK) were successfully used, showing clear constellation diagrams and relatively low root mean squared error vector magnitude (rms EVM) values of 23.9% and 23.6%, respectively. Moreover, data transfer at 0.4 Gbit/s in 16 quadrature amplitude modulation (16QAM) demonstrated clear isolated symbols and achieved a low rms EVM value of 8.1%, complying with the IEEE 802.15.3d standard amendment. These demonstrations highlight the potential of using injection-locked DFB lasers with the Kerr micro-resonator soliton comb to achieve high-quality, high-speed wireless data transfer in the 560-GHz band. These findings contribute significantly to the advancement of wireless communication technology in the THz frequency range and pave the way for the realization of 6G wireless communication systems

Carrier conversion from terahertz wave to dual-wavelength near-infrared light injection-locking to optical comb using asynchronous nonpolarimetric electro-optic downconversion with electro-optic polymer modulator

THz waves are promising wireless carriers for next-generation wireless communications, where a seamless connection from wireless to optical communication is required. In this study, we demonstrate carrier conversion from THz waves to dual-wavelength NIR light injection-locking to an optical frequency comb using asynchronous nonpolarimetric electro-optic downconversion with an electro-optic polymer modulator. THz wave in the W band was obtained as a stable photonic RF beat signal of 1 GHz with a signal-to-noise ratio of 25 dB via the proposed THz-to-NIR carrier conversion. In addition, the results imply the potential of the photonic detection of THz waves for wireless-to-optical seamless communication.Comment: 15 pages, 5 figure

環境デザインに関する国際教育プログラムの構築について（その2）/二つのワークショップの比較考察

本研究は、神戸芸術工科大学紀要「芸術工学2013」に掲載した「環境デザインに関する国際教育プログラムの構築について」の継続研究であり、本稿では前稿で取り上げた活動以降の2013年度に実施した内容について報告する。本研究で注目しているのは、環境デザイン分野における現地集中開催型の国際ワークショップである。2013年度は2012年度に引き続き、5月にイタリアのサルデーニャで開催されたLandWorks に参加し、インスタレーションを現地で実際に制作することを特色とするこのワークショップ特有の運営面での工夫等に関して、さらに詳細な情報収集を行った。また、9月にフランスのノルマンディー地方で開催されたEMiLA（EuropeanMasters in Landscape Architecture）サマースクールのワークショップに参加し、より広域的な課題への取り組み手法と、国が異なる5 大学の共通プログラムという、教育の国際化を考える上でたいへん興味深い教育制度の仕組みについて情報収集した。本稿では、これら2つのワークショップの概要について説明した後、実施運営面および教育制度面という2つの観点からの比較考察を行い、両者の相違点を明確にした上で、国際ワークショップの企画運営、ならびに、それを教育プログラムに組み入れる上での、主要な検討項目について整理する。This paper further develops the research topic discussed in "Investigation for International Education Programs in the Field of Environmental Design" published in 2013 on this Bulletin of Kobe Design University.During the academic year 2013, we participated in two international workshops: LandWorks Sardina in Italy, and the workshop of EMiLA (European Masters in Landscape Architecture) Summer School held in France. While the LandWorks focus on the realization of on-site projects, the EMiLA workshop deals with the problems of wider areas. The unique educational system of EMiLA as the common program of 5 schools from different countries in Europe is also investigated.In this paper, after the explanation of the two workshops mentioned above, a comparative analysis is made from the viewpoints of the administration and the relation to the educational systems. The differences of the two workshops provide a range of possibilities regarding the organization of similar international workshops and the incorporation of them into the exisiting educational systems