学習・運動データを用いた学生の自主学習スキルの向上

京都大学新制・課程博士博士(情報学)甲第23315号情博第751号新制||情||128(附属図書館)京都大学大学院情報学研究科社会情報学専攻(主査)教授 緒方 広明, 教授 黒田 知宏, 教授 楠見 孝学位規則第4条第1項該当Doctor of InformaticsKyoto UniversityDFA

Structural multi-damage identification based on strain energy and micro-search artificial fish swarm algorithm

A two-stage damage detection method based on strain energy and micro-search artificial fish swarm algorithm (MSAFSA) is presented for solving structural multi-damage problem. First, structural modal strain energy and energy dissipation process are analyzed and an improved modal strain energy dissipation ration index (IMSEDRI) is proposed to preliminarily detect suspected damage elements. Then, artificial fish swarm algorithm (AFSA) is used to identify damage extent of suspected damage elements. In general, the search efficiency of a basic AFSA isn’t very efficient for the search procedure. So, a micro-search artificial fish swarm algorithm is presented in this paper. The simulation results demonstrate that the damage detection method can estimate the damage locations and extent with good accuracy, and the calculated results of the proposed MSAFSA are obviously superior to those of both the basic AFSA and the AFSA with visual-step change strategy

Investigation of doped ZnO by Molecular Beam Epitaxy for n- and p-type Conductivity

This dissertation presents an investigation of the properties, especially the electrical properties, of doped ZnO films grown by plasma-assisted molecular beam epitaxy (MBE) under different conditions. The interest in investigating ZnO films is motivated by the potential of ZnO to replace the currently dominant ITO in industries as n-type transparent electrodes and the difficulty in achieving reliable and reproducible p-type ZnO. On the one hand, n-type ZnO heavily doped with Al or Ga (AZO or GZO) is the most promising to replace ITO due to the low cost, abundant material resources, non-toxicity , high conductivity, and high transparency. On the other hand, ZnO doped with a large-size-mismatched element of Sb (SZO) or co-doped with N and Te exhibits the possibility of achieving p-type ZnO. In this dissertation, the effects of MBE growth parameters on the properties of GZO have been investigated in detail. The ratio of oxygen to metal (Zn+Ga) was found to be critical in affecting the structural, electrical, and optical properties of GZO layers as revealed by x-ray diffraction (XRD), transmission electron microscopy (TEM), Hall measurement, photoluminescence (PL), and transmittance measurements. Highly conductive (~2×10-4 Ω-cm) and transparent GZO films (\u3e 90% in the visible spectral range) were achieved by MBE under metal-rich conditions (reactive oxygen to incorporated Zn ratio \u3c 1). The highly conductive and transparent GZO layers grown under optimized conditions were applied as p-side transparent electrodes in InGaN-LEDs, which exhibited many advantages over the traditional thin semi-transparent Ni/Au electrodes. The surface morphologies of GaN templates were demonstrated to be important in affecting the structural and electrical properties of GZO layers. In those highly conductive and transparent GZO layers with high-quality crystalline structures, studies revealed ionized impurity scattering being the dominant mechanism limiting the mobility in the temperature range of 15-330 K, while polar optical phonon scattering being the mechanism responsible for the temperature-dependence for T\u3e150 K. The majority Sb ions were found to reside on Zn sites instead of O sites for lower Sb concentrations (~0.1 at.%), which can lead to a high electron concentration of above 1019 cm-3 along with a high electron mobility of 110 cm2/V-s at room temperature. The reduction in electron concentration and mobility for higher Sb concentrations (~1 at.%) was caused by the deterioration of the crystalline quality. ZnO co-doped with N and Te was also studied and the advantages of the co-doping technique and problems in achieving p-type conductivity are discussed

A Confucian Holistic World Order and China\u27s Vision of a Shared Future

In his article A Confucian Holistic World Order and China\u27s Vision of a Shared Future, Huiyong Wu traces the differences between the Western world and China, as well as their impact upon politics, economic relations and culture. In particular, Wu focuses on China\u27s political ideal, based on Confucian moral ethics, which emphasizes inter-subjectivity over the individual subjectivity, and which holds a strong vision of communal respect among national citizens. This vision might be somehow in conflict with the Western tradition that places individual freedom above everything else. Through initiatives like the Belt and Road China is steadily developing and promoting A Community with a Shared Future, a holistic world order that directs itself towards the ideal of eliminating conflicts and seeking peace

Research on Carbon Accounting Information Disclosure of BS Company

With the proposal of China's "dual-carbon" strategic goals and the gradual implementation of energy-saving and emission reduction plans at various levels, the carbon accounting information disclosure of key industries with carbon emissions has received increasing attention from all sectors of society. As the second largest carbon emitter in China after the power industry, the steel industry naturally becomes a focus of attention. This article takes BS Company, which is representative in China's steel industry, as the research object, analyzes the basic situation of carbon accounting information disclosure of BS Company, such as its methods and content, and further analyzes the main problems existing in its carbon accounting information disclosure, so as to provide corresponding suggestions

The United Nations Sustainable Development Goals as a Global Content Framework?

Existing research in global and social studies education has focused on methods, tools, and instruments to impart dispositions and skills for global learning, with little research pertaining to key global content knowledge. In this manuscript, authors consider the use of the United Nation’s Sustainable Development Goals as a prospective global content knowledge framework to impart global learning in social studies. Middle-grades Ancient World History content standards from two countries, China and the U.S., are reviewed to evaluate the degree of their alignment to the United Nations’ Sustainable Development Goals; namely goal number 5: Gender Equality. The authors found little direct content alignment between content presented in the SDG and the reviewed content standards. Implications of this research in the consideration of global content knowledge frameworks, as well as preparing learners to live-up to the expectations of the SDGs, namely goal number five, in social studies are discussed

Structural nonlinear damage detection using improved Dempster-Shafer theory and time domain model

In the service period, a crack may appear in some engineering structures. The development of accurate and effective methods for crack damage detection has become a topic of great importance. In this paper, a nonlinear damage detection method based on the improved Dempster-Shafer (D-S) theory and time domain model is presented. First, acceleration responses in the undamaged and damaged states are measured by using accelerometers. Then, acceleration responses are utilized to establish an autoregressive (AR) model, and residual time series of acceleration responses are used to establish an autoregressive conditional heteroskedasticity (ARCH) model. A cepstral metric conversion (CMC) method based on the AR model is employed to obtain local damage solution and an autoregressive conditional heteroskedasticity conversion (ARCHC) method based on ARCH model is presented to acquire another local damage solution. Finally, the D-S theory is applied to detect damages by integrating these local damage solutions, and an improved D-S theory is further presented to enhance the detection accuracy. The numerical and experimental examples show that the improved D-S theory has high detection accuracy and good performance