規定された共役構造を有する分子の凝集制御と光電子物性に関する研究

京都大学新制・課程博士博士(工学)甲第24236号工博第5064号京都大学大学院工学研究科分子工学専攻(主査)教授 関 修平, 教授 今堀 博, 教授 杉安 和憲学位規則第4条第1項該当Doctor of Philosophy (Engineering)Kyoto UniversityDFA

計量言語学の視座から見た数学の授業の真正性

全国数学教育学会第51回研究発表会 日時 : 令和元年12月14日（土）12:00～18:10, 12月15日（日）8:50～16:15 会場 : 広島大学大学院教育学研究科・教育学部（東広島キャンパス

Stepwise Acquisition of Dialogue Act Through Human-Robot Interaction

A dialogue act (DA) represents the meaning of an utterance at the illocutionary force level (Austin 1962) such as a question, a request, and a greeting. Since DAs take charge of the most fundamental part of communication, we believe that the elucidation of DA learning mechanism is important for cognitive science and artificial intelligence. The purpose of this study is to verify that scaffolding takes place when a human teaches a robot, and to let a robot learn to estimate DAs and to make a response based on them step by step utilizing scaffolding provided by a human. To realize that, it is necessary for the robot to detect changes in utterance and rewards given by the partner and continue learning accordingly. Experimental results demonstrated that participants who continued interaction for a sufficiently long time often gave scaffolding for the robot. Although the number of experiments is still insufficient to obtain a definite conclusion, we observed that 1) the robot quickly learned to respond to DAs in most cases if the participants only spoke utterances that match the situation, 2) in the case of participants who builds scaffolding differently from what we assumed, learning did not proceed quickly, and 3) the robot could learn to estimate DAs almost exactly if the participants kept interaction for a sufficiently long time even if the scaffolding was unexpected.Comment: Published as a conference paper at IJCNN 201

Quantitative ultrasonic assessment for detecting microscopic cartilage damage in osteoarthritis

Osteoarthritis (OA) is one of the most prevalent chronic conditions. The histological cartilage changes in OA include surface erosion and irregularities, deep fissures, and alterations in the staining of the matrix. The reversibility of these chondral alterations is still under debate. It is expected that clinical and basic science studies will provide the clinician with new scientific information about the natural history and optimal treatment of OA at an early stage. However, a reliable method for detecting microscopic changes in early OA has not yet been established. We have developed a novel system for evaluating articular cartilage, in which the acoustic properties of the articular cartilage are measured by introducing an ultrasonic probe into the knee joint under arthroscopy. The purpose of this study was to assess microscopic cartilage damage in OA by using this cartilage evaluation system on collagenase-treated articular cartilage in vivo and in vitro. Ultrasonic echoes from articular cartilage were converted into a wavelet map by wavelet transformation. On the wavelet map, the maximum magnitude and echo duration were selected as quantitative indices. Using these indices, the articular cartilage was examined to elucidate the relationships of the ultrasonic analysis with biochemical, biomechanical and histological analyses. In the in vitro study, the maximum magnitude decreased as the duration of collagenase digestion increased. Correlations were observed between the maximum magnitude and the proteoglycan content from biochemical findings, and the maximum magnitude and the aggregate modulus from biomechanical findings. From the histological findings, matrix staining of the surface layer to a depth of 500 μm was closely related to the maximum magnitude. In the in vivo study, the maximum magnitude decreased with increasing duration of the collagenase injection. There was a significant correlation between the maximum magnitude and the aggregate modulus. The evaluation system therefore successfully detected microscopic changes in degenerated cartilage with the use of collagen-induced OA

Heterogeneous Consumer Expectations and Monopoly Pricing for Durables with Network Externalities

This paper studies the optimal pricing and diffusion of durable goods that exhibit positive network externalities, when consumers are heterogeneous in their expectations about future network sizes. We consider the existence of naive consumers, as well as of sophisticated consumers having fulfilled expectations. We find that the firm charges the sequential-diffusion pricing that makes sophisticated consumers function as early adopters, unless consumers quickly become bored with using the goods and/or unless the firm heavily discounts its future profits. We also compare the profitability of three possible pricing strategies with different commitment powers: fixed, responsive, and pre-announced pricing

Pricing and Diffusion of Durables with Network Externalities

This paper considers the optimal pricing and diffusion of a durable good that exhibits positive network externalities, when consumers are heterogeneous with respect to their expectations about future network sizes. We consider the existence of naive consumers, as well as of sophisticated consumers who have fulfilled expectations about future network sizes. At the time of purchase, naive consumers presume that the current network size will continue over future periods. We find that the firm charges the sequential-diffusion pricing that makes sophisticated consumers function as early adopters, unless consumers quickly become bored with using the goods and/or unless the firm heavily discounts its future profits. In addition, we show that naive consumers may enjoy a greater surplus than do sophisticated consumers, implying that the firm benefits when more consumers are sophisticated. We also compare the profitability of three possible pricing strategies with different commitment powers: fixed, responsive, and pre-announced pricing

Pricing and Diffusion of Durables with Network Externalities

This paper considers the optimal pricing and diffusion of a durable good that exhibits positive network externalities, when consumers are heterogeneous with respect to their expectations about future network sizes. We consider the existence of naive consumers, as well as of sophisticated consumers who have fulfilled expectations about future network sizes. At the time of purchase, naive consumers presume that the current network size will continue over future periods. We find that the firm charges the sequential-diffusion pricing that makes sophisticated consumers function as early adopters, unless consumers quickly become bored with using the goods and/or unless the firm heavily discounts its future profits. In addition, we show that naive consumers may enjoy a greater surplus than do sophisticated consumers, implying that the firm benefits when more consumers are sophisticated. We also compare the profitability of three possible pricing strategies with different commitment powers: fixed, responsive, and pre-announced pricing