| IVAN HALIM PARMONANGAN | M, 2回目発表 | 知能コミュニケーション | 中村 哲, 佐藤 嘉伸, 国田 勝行(BS), 田中 宏季，Sakriani Sakti |
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title: Estimating The Mean Opinion Score of Synthesized Japanese Speech Using EEG
abstract: Synthesized speech sound quality is one of the important things to be evaluated. In general there are three different approaches to evaluate the synthesized speech quality. This study focused on neurophysiological activity in order to measure the naturalness of the preceived synthesized speech quality. Neurophysiological approach such as measuring heartbeat or brain activity is favorable becuase it is not easy to be volitionally concealed. Moreover, most of the quality formation and judgement process take palce inside the listener's brain. Therefore probing the brain activity is expected to provide better understanding of human quality judegement processes. This study shows that using generalized fisher score it shows that there are certain channels at each frequency bands that shows difference in power during the first two secods after the stimuli was presented. language of the presentation: English | |||
| 清光 将生 | M, 1回目発表 | 大規模システム管理 | 笠原 正治, 藤川 和利, 笹部 昌弘 |
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title: On Proximity-based Relaxation of Equivalent Piece Exchange between Peers in Tit-for-Tat-based P2P Streaming
abstract: Recently, video traffic has been occupying the large portion of the Internet traffic, due to the proliferation of the streaming services. Peer-to-Peer (P2P) networking is a promising technique to make the file/streaming distribution systems more scalable with the help of user devices (peers) assistance. However, some peers may not be willing to upload fragments of the content (i.e., pieces) to others so as to save their own resources, e.g., access link capacity. Tit-for-Tat (TFT) strategy in game theory is one possible way to alleviate such free-riding behavior by encouraging equivalent exchanges of pieces among each pair of peers. Recently, the optimality of the TFT-based P2P content distribution has been analyzed. In particular, one of the existing works analyzed the impact of the physical proximity among peers on the TFT-based P2P file distribution under the fact that the communication overhead inside a group, e.g., LAN or Autonomous System (AS), is much less than that between different groups. In this study, we extend this work to the streaming cases. Inspired by the existing approach, we first model the streaming system as a discrete system and then formulate the minimization of average play-out delay among peers as Integer Linear Programming (ILP). Through numerical examples obtained using the existing solver, CPLEX, we show the impact of the physical proximity among peers on the optimality of the TFT-based P2P streaming. language of the presentation: Japanese | |||
| 源 芳朗 | M, 1回目発表 | 大規模システム管理 | 笠原 正治, 松本 健一, 笹部 昌弘, 張 元玉 |
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title: A Blockchain-Based Open and Decentralized Publishing System for Scientific Papers
abstract: Publishers, such as Elsevier, Springer and Wiley, serve as intermediaries between authors, reviewers, and readers in current publishing systems. These publishers are centralized and usually charge both readers and authors, thus slowing the dissemination of research ideas and results to some extent. Thus, the role of publishers in scientific community has been questioned. Some works have been done to design publishing/reviewing systems without publishers. Among them, two promising solutions are a blockchain-based decentralized system and a web-based review system, called OpenReview. The former implements the traditional review process using the blockchain technology, while the whole review process is not open and thus the objectivity of quality of reviews/comments cannot be guaranteed. In contrast, the latter discloses the review process and allows anyone to comment on submitted papers and reviews, while the system is still centralized and may suffer from the issue of single point of failure. Therefore, our research aims to combine these two systems to design a novel decentralized publishing/reviewing system with high objectivity and quality of reviews/comments. language of the presentation:Japanese | |||
| 中西 瑠海 | M, 1回目発表 | 大規模システム管理 | 笠原 正治, 松本 健一, 笹部 昌弘, 張元玉 |
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title: IOTA-Based Access Control Framework for the Internet of Things
abstract: Due to the rapid penetration of IoT into our daily lives, there has been an increasingly urgent demand for effective IoT access control schemes to ensure the safety and privacy of people. Recently, IoT access control schemes based on the blockchain technology have attracted considerable attention. Although these schemes are promising to achieve decentralized and trustworthy access control, the limitations of long access request-processing time and poor scalability may hinder their application to practical IoT systems. To address these limitations, an access control scheme, called DCACI, has been proposed based on the emerging IOTA technology. The idea of the DCACI scheme is to store the access rights of subjects, in the format of tokens, into the IOTA Tangle. However, this scheme suffers from three main drawbacks: 1) providing no implementation of authorization; 2) requiring pre-established secure links between subjects and object owners; and 3) supporting only one-to-one access control. To solve these problems, we propose a novel access control scheme by combining the IOTA technology and the Ciphertext-Policy Attribute-Based Encryption (CP-ABE) technology. language of the presentation: Japanese | |||