Kyutacar : Kyushu Institute of Technology Academic Repository
Not a member yet
9746 research outputs found
Sort by
The Influence of a Microstructural Conformation of Oriented Floating Films of Semiconducting Polymers on Organic Device Performance
Get PDFExtended π-conjugation with backbone-planarity-driven π-π stacking dominates charge transport in semiconducting polymers (SCPs). The roles of SCP film morphology and macromolecular conformation concerning the substrate in influencing charge transport and its impact on device performance have been a subject of extensive debate. Face-on SCPs promote out-of-plane charge transport primarily through π-π stacking, with conjugated polymeric chains assisting transport in connecting crystalline domains, whereas edge-on SCPs promote in-plane charge transport primarily through conjugation and π-π stacking. In this work, we fabricated three different types of devices, namely, organic field effect transistors, organic Schottky diodes, and organic bistable memristors, as representatives of planar and vertical devices. We demonstrate that a planar device, i.e., an organic field effect transistor, performs well in an edge-on conformation exhibiting a field-effect mobility of 0.12 cm2V−1s−1 and on/off ratio >104, whereas vertical devices, i.e., organic Schottky diodes and organic memristors, perform well in a face-on conformation, exhibiting exceptionally high on/off ratios of ~107 and 106, respectively.journal articl
Numerical simulation on wavefront transformation using self-referential holographic deep neural network
Get PDF5th International Symposium on Neuromorphic AI Hardware, March 1-2, 2024, Kyushu Institute of Technologyconference pape
組込み開発向けスクリプト言語 mruby/c を対象にしたハードウェアアクセラレーションの設計と評価
Get PDF九州工業大学博士（情報工学）第1章 序論| 第2章 組込み開発向けスクリプト言語mruby/c| 第3章 mruby/c 仮想マシンのプロファイルとハードウェアアクセラレーションの設計方針| 第4章 mruby/c を実行するFPGA のシステム構成| 第5章 ハードウェアアクセラレーションの構成| 第6章 性能評価と考察| 第7章 結言九州工業大学博士学位論文 学位記番号:情工博甲第398号 学位授与年月日:令和6年6月28日令和6年度doctoral thesi
Calculation Method of Static Friction Forces for Multi-Joint Manipulators
Get PDFThe static friction force is an important element of practical problems, such as the model-based control design of mechanical systems described by the Euler-Lagrange equations. The difficulty in calculating the static friction force, represented by a discontinuous function, lies in the fact that the differential equations representing the equations of motion become discontinuous differential-algebraic equations (DAEs). To solve the discontinuous DAEs using numerical methods, we need to solve a non-differential implicit algebraic equation at each step. In this letter, we propose an algorithm for calculating the static friction force by solving the implicit algebraic equation. Theoretical analysis shows that the friction force exists uniquely. This ensures that the proposed algorithm obtains a unique value for the static friction force. Moreover, the number of iterations in the proposed algorithm is only 3n at worst, where n denotes the number of manipulator joints. Hence, the proposed method matches numerical differential equation solvers, such as the Euler method. The effectiveness of the proposed method was validated through simulations using simple mechanical systems.journal articl
効率的な大量生産のための1Uモジュール式キューブサットインターフェースの開発と標準化
Get PDF九州工業大学九州工業大学博士学位論文（要旨）学位記番号: 工博甲第592号 学位授与年月日:令和6年9月25日thesi
過酸化水素生成の最適化：MXeneおよびAuで修飾されたUVおよび可視光応答性Brookite TiO2およびWO3の開発に関する研究
Get PDF九州工業大学九州工業大学博士学位論文（要旨）学位記番号: 工博甲第598号 学位授与年月日:令和6年9月25日thesi
カンチレバー間を弾性体薄膜で連結した広帯域圧電型MEMS音響センサーの研究
Get PDF九州工業大学九州工業大学博士学位論文（要旨）学位記番号: 情工博甲第403号 学位授与年月日:令和6年9月25日thesi
限られた計算機資源やデータを有効利用した意見マイニング
Get PDF九州工業大学博士（情報工学）1 Introduction| 2 Basic Model and Technique| 3 Dataset Construction and Opinion Holder Detection Using Pre-Trained Models| 4 Demonstration of Effectiveness of Nativeness in Stepwise Learning by Performing
Bangla Sentiment Analysis| 5 Dataset Construction and Evaluation for Aspect-Opinion Extraction in Bangla
Fine-Grained Sentiment Analysis| 6 Demonstration of Effectiveness of Exploiting ChatGPT-Generated Data to the
Transformers-Based Models by Performing Bangla Intent Analysis| 7 ConclusionAs the Internet’s role in daily communication expands, so does the practice of sharing
opinions on platforms like Facebook, Twitter, and Amazon. This proliferation of usergenerated content makes manual analysis of online opinion trends impractical, highlighting the need for automated opinion mining techniques. Opinion mining, a subfield of natural language processing (NLP), aims to extract and analyze opinions from textual data and plays a crucial role in market research, product feedback, and public opinion analysis. In NLP research, two primary approaches are used to categorize text: sentence-level and token-level classification. Sentence-level classification categorizes entire sentences into predefined classes, commonly utilized in sentiment analysis, topic classification, and document classification.
Conversely, token-level classification is more granular, assigning labels to individual words or tokens within texts, which is essential for tasks like named entity recognition (NER), part-of-speech (POS) tagging, and fine-grained sentiment analysis. This thesis utilizes limited computational resources (such as memory and processing power) and data in opinion mining by dealing with four tasks: opinion holder detection, sentiment analysis, aspect-opinion extraction, and intent analysis. In this thesis, opinion holder detection consists of two steps: detecting the presence of opinion holders in the text and identifying them. For the first step, we employ DistilBERT as a feature extractor with logistic regression (LR), namely DistilBERT+LR to utilize limited computational resources with better performance than BERT+LR. The second step employs a character-level contextual string embedding (CSE) model with conditional random field (CRF), namely CSE+CRF, which utilizes limited computational resources while exhibiting very competitive performance compared with the heavyweight models. In sentiment analysis for limited Bangla data, we apply stepwise learning utilizing transformers-based models. This technique leverages an auxiliary task with larger datasets to improve performance on the main task with smaller datasets.
The effectiveness of writers’ opinion expression styles (“nativeness”) between source and target data in stepwise learning is also explored. Aspect-opinion extraction focuses on Bangla, addressing the limitations of conventional sentiment analysis, which assumes a single sentiment per text. Aspect-opinion extraction identifies multiple targets and opinions within a text, providing a more granular understanding. We propose a method that combines feature embeddings from different transformers-based models followed by fine-tuning to utilize limited prepared Bangla data effectively for performance improvement. The intent analysis study extends conventional sentiment analysis by introducing more classes such as suggestion and sarcastic for deeper insights and handles the task at a granular level, differing from the token-level aspect-opinion extraction where there is no dealing with sarcasm. Due to no annotated Bangla data for this task, we generate ChatGPT data as auxiliary data. We also prepare user-generated limited Bangla data. Then we deploy a semi-supervised self-training with transformers-based models to exploit the auxiliary data to enhance performance on the prepared user-generated limited Bangla data.九州工業大学博士学位論文 学位記番号:情工博甲第402号 学位授与年月日:令和6年9月25日令和6年度doctoral thesi
里山と人の関わりの再生に向けた地域の環境政策の実践と協働に関する研究
Get PDF九州工業大学博士（工学）1. Introduction| 2. The process of formulating and implementing local environmental policy -The case study in Fukutsu City| 3. Emergence process of governance for restoring an unmanaged ecosystem: Comparison of two activities at the Satoyama Forest and Coastal Pine Forests in Fukutsu City, Japan| 4. The process of revitalization of Satoyama through collaborative management| 5. Comparison of the actors and the process of activity development on bamboo forest management in the northern part of Fukuoka prefecture| 6. Discussion| 7. Conclusion and Future issueThe underuse of secondary nature is one of the factors that causes biodiversity loss. In Japan, such secondary natures are called Satoyama, and biodiversity has been maintained through the management and use of natural resources by local people. To realize a sustainable society, it is crucial to elucidate and construct a social-ecological system to conserve local biodiversity while obtaining ecosystem services from nature. As a social system for biodiversity conservation, goals and plans are being formulated at the international to local administrative scales. For local biodiversity conservation, the role of local governments is particularly important. However, for example, the status of the
formulation of regional biodiversity strategies is still low at 8% of the total in Japan. In such “new public issues” that do not have a legal system and have not yet received a systematic response from the government, who and how to design the process of building collaborative governance remains subject to debate. This thesis aims to (a) reveal the emergence and development process of restoring the relationships between Satoyama and the local people and (b) discuss the process and system of restoring the relationships between Satoyama and the people from the perspective of commons theory and governance theory. This thesis describes the case study of the collaborative Satoyama restoration project as the implementation of regional biodiversity in Fukutsu City.
Chapter 1 describes the background, previous study and key concepts of this thesis.
In Chapter 2, the environmental policy process in Fukutsu City and the network expansion between stakeholders were described. In addition, the role and objectives of key persons for managing the process were revealed through the semi-structured interviews. The academic sector played an important role in the environmental policy process, which began with administrative staff approaching university professors. On the other hand, the citizen group participated in the process, but collaboration between the public, private, and academic
sectors had not yet been achieved.
Chapter 3 discusses how to build a governance system by revealing the emergence and
development process of two conservation activities on the coastal pine forest and Satoyama forest linked with administrative planning in the same municipality. We conducted interview surveys for the administrative staff and residents who were involved in the conservation activity, literature surveys, and participant observations for conservation activities. We clarified the turning point of each activity's emergence and development process and the factor that enabled the development of governance from the perspective of the policies inducing its process and the changes in the stakeholder interaction with the landscape. This study clarified these important factors for building governance: 1) creating bottom-up flow from residents based on recognizing values, 2) top-down flow of local government for clear policy direction and indirect steering, and 3) the actor who intervened and coordinated the process.
In Chapter 4, semi-structured interviews were conducted with local residents who used the Satoyama forest in the past and people who were involved in the current restoration project in order to clarify how people interacted with each other and how the activities developed, as well as the process and turning points of the activities. In addition, the transition of ecosystem services as an outcome of the restoration of people's relationship with Satoyama through the implementation of the activities was evaluated. Through the process of sharing and recognizing issues, there was a process of seeking values through collaboration between residents and the university. The residents who found the value of being involved with Satoyama are now revitalizing it as a commons by establishing their own rules for obtaining various resources and using natural resources in their own businesses. Through this process, a management system of regular access to Satoyama and a variety of ecosystem services are being regenerated.
In Chapter 5, three bamboo forest management activities in the northern part of Fukuoka prefecture were compared, including the development process of each activity and the actors' motivation. The actor’s motivation is for biodiversity conservation, ecological education, and other purposes. Forests can provide a variety of ecosystem services depending on how they are managed and used. Despite the motivation or the contents of activities, management activities may stop due to social factors such as changes in organizational contracts and staff changes. Building a community and system that guarantees the continuity of activities is important.
In Chapter 6, the discussion regarding the process and system of the case study was described. At the base of restoring commons was the process of building a community to revitalize Satoyama by collaboratively exploring and realizing ecosystem services. Connecting local activities and environmental policy adaptively and complementary is necessary for building collaborative governance.九州工業大学博士学位論文 学位記番号:工博甲第584号 学位授与年月日:令和6年3月25日令和5年度doctoral thesi