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15th International Workshop on Japanese Society for Artificial Intelligence, JSAI 2001

作者： Koga, Takatsugu Miyamoto, Sadaaki Takata, Osamu Graduate School of Systems and Information Engineering University of Tsukuba Ibaraki305-8573 Japan Institute of Engineering Mechanics and Systems University of Tsukuba Japan Doctoral Program in Engineering University of Tsukuba Japan

ISBN: (纸本)9783540455486

This paper aims at proposing and comparing two fuzzy models and a statistical model for clustering based on L1-space. Clustering methods in the fuzzy models are the standard fuzzy c-means and an entropy regularization method based on L1-space. Furthermore, we add new variables to them for improving the cluster division. In the statistical model, a mixture distribution model based on L1-space is proposed and the EM algorithm is applied. © Springer-Verlag Berlin Heidelberg 2001.

关键词： Mixtures

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Thermomechanical Characterization of Hot Surface Ignition Device Using Phenomenological Heat Flux Model

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JOURNAL OF PROPULSION AND POWER 2022年第4期38卷 656-670页

作者： Kang, Sang-Guk Ryu, Je Ir Motily, Austen H. Numkiatsakul, Prapassorn Lee, Tonghun Kriven, Waltraud M. Kim, Kenneth S. Kweon, Chol-Bum M. U.S. Army Research Laboratory Aberdeen Proving Ground MD 21005 Aerospace Engineer Weapons and Materials Research Directorate Postdoctoral Fellow Computational and Information Sciences Directorate University of Illinois at Urbana-Champaign Urbana IL 61801 Graduate Student Department of Mechanical Science and Engineering. Student Member AIAA Graduate Student Department of Materials Science and Engineering Professor Department of Mechanical Science and Engineering. Associate Fellow AIAA Professor Department of Materials Science and Engineering Mechanical Engineer Computational and Information Sciences Directorate. Member AIAA Program Manager Computational and Information Sciences Directorate. Member AIAA.

Modern aircraft compression ignition engines that seek to achieve fuel-flexible operation require ignition-assisting devices to perform reliably. Many military propulsion systems, and unmanned aircraft in particular, can use hot surface energy addition to improve engine performance. An analysis of the thermomechanical stress behavior of hot surface ignition devices is therefore critical to ensure that they can satisfy new operational requirements. In this paper, a phenomenological heat-flux model is proposed to simulate heat generation inside a heating element. Two finite element analysis models are established using the proposed heat-flux model in order to characterize the transient thermomechanical behavior of an ignition assistant: a two-dimensional (2-D) axisymmetric model with an equivalent cylindrical heating element and a three-dimensional (3-D) solid model with realistic heating element geometry. The transient behavior of the ignition assistant is investigated at standard conditions by characterizing the temperature and thermal stress inside the device for various input voltages. The effect of the nonaxisymmetric heating element geometry on the temperature and thermal stress distribution is assessed. Furthermore, the 3-D ignition assistant model is used to analyze the thermomechanical behavior of an ignition device subjected to a combustion event inside a rapid compression machine. Multiple circumferential orientations of the heating element plane relative to the spray axis are investigated. Results demonstrate that the observed maximum principal stress depends significantly on heating element orientation.

关键词： Heat Flux Stress Distribution Heat Generation Unmanned Aerial Vehicle Propulsion System Surface Energy Adaptive Mesh Refinement Fuel Injection CFD Simulation Fracture Toughness

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Random Number Generator for Securing Data Exchange in Smart Factory: Recent Trends and Best Practices 3

Random Number Generator for Securing Data Exchange in Smart ...

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3rd International Conference on Computer Technologies, ICCTech 2024

作者： Sama, Andi Meyliana Heryadi, Yaya Sahroni, Taufik Roni Bina Nusantara University Binus Graduate Program - Computer Science Computer Science Department Jakarta11480 Indonesia Bina Nusantara University School of Information System Information System Department Jakarta11480 Indonesia BINUS Graduate Program-Doctor of Computer Science Jakarta Computer Science Department Jakarta11530 Indonesia Bina Nusantara University BINUS Graduate Program - Master of Industrial Engineering Industrial Engineering Department Jakarta11480 Indonesia

ISBN: (纸本)9798350395419

IT/OT convergence in the form of a Cyber-Physical System (CPS) presents an opportunity to apply recent information Technology (IT) advancements to Operational Technology (OT). The IT/OT convergence introduces cyber security threats for OT. The OT communication protocols, for example, have limited or no security capabilities for securing data exchange beyond basic authentication. The RNG (Random Number Generator) function is crucial in PLC for producing the encryption keys or the initial seed for security algorithms. The software-based PRNG (Pseudo RNG) is the most common approach for RNG in OT, instead of hardware-based RNG. This study provides a systematic literature review of the most recent evidence in digital transformation to secure data exchange in smart factories, within OT, or across OT and IT settings. It does this by looking at the PRNG on PLC and identifying the most recent trends and best practices. The findings include up-to-date data on author countries' distribution, published journals, research trends, industries, and industry types. The findings also address whether data flow is encrypted or shared in plaintext to ensure secure data transfer between IT and legacy OT environments. This paper concludes that while there is known RNG implementation in the actual embedded system in ICS, there is no evidence in the literature for using RNG in ICS networks for PLC implementation to secure data transfer with encryption. © 2024 IEEE.

关键词： Data transfer

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Dynamic stability of contact slider over practical disk surface

Dynamic stability of contact slider over practical disk surf...

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Asia-Pacific Magnetic Recording Conference 2002, APMRC 2002

作者： Park, Kyoung-Su Chun, Jeong-Il Park, Young-Pil Park, No-Cheol Mechanical Engineering Department Yonsei University Seoul120-749 Korea Republic of Graduate Program in Information Storage Engineering Yonsei University Seoul120-749 Korea Republic of

ISBN: (纸本)0780375092

As the contact slider system has a high area density, this system will be used in future high performance drives. So the dynamic characteristic research for this system is an important issue. The contact slider system is modeled as 2-DOF mathematical model. When slider contacts on disk surface, simulation is performed with contact governing equation. The formula for contact is derived by numerically Green's function of a semi-infinite elastic body over the contact surface. Otherwise, when the slider flies over disk surface, the analysis is carried out with flying governing equation. Disk surface is composed by the practical disk amplitude with SPM (scanning probe microscopy). Through this model, the flying stability of contact slider are investigated for various parameters. © 2002 IEEE.

关键词： Scanning probe microscopy

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Amico: Message Exchange Service for Elderly People 11

Amico: Message Exchange Service for Elderly People

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11th IEEE Global Conference on Consumer Electronics, GCCE 2022

作者： Isozaki, Atsushi Fukae, Kazuki Arai, Kenichi Kobayashi, Toru Nakamura, Masahide Nagasaki University Computer and Information Science Program Graduate School of Engineering Nagasaki Japan Nagasaki University Division of Electrical Engineering and Computer Science Graduate School of Engineering Nagasaki Japan Kobe University Center of Mathematical and Data Sciences Hyogo Japan

ISBN: (纸本)9781665492324

This study is related to a system that enables elderly people to communicate interactively with young people who use existing message exchange services by simply speaking to an avatar on a tablet PC, without having to perform complicated operations of the tablet PC. On the other hand, the young people side can bring in elderly people who could not previously participate in existing message exchange services groups. The effectiveness of the system was verified through demonstration experiments with two households consisting of elderly people in their 80s. © 2022 IEEE.

关键词： Personal computers

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Strategies to attract information technology students: An extrapolation of worker experiences

Strategies to attract information technology students: An ex...

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ASEE 2004 Annual Conference and Exposition, "engineering Researchs New Heights"

作者： Cullinane, Thomas P. Perry, Ronald F. Yanmaz, Baris Department of Mechanical Engineering Northeastern University Boston MA Graduate Information Systems Program Northeastern University Boston MA Northeastern University Boston MA

The predicted dramatic increase in demand for IT workers in the next decade suggests an opportunity for IT educators to establish plans to ramp up to meet these needs. The purpose of this paper is to help educators understand factors that are important to IT workers and that can be influenced by the educational process. The work reported here is part of an NSF grant that explored current IT worker experiences and motivations. Data for the study was collected using a forty-four-item questionnaire sent to currently employed IT workers in the Boston area. Stepwise multiple linear regression was used to relate certain outcome variables to attributes and opinions of the respondents as represented by question item responses. Relationships have been discovered that will help educators craft academic programs and identify potentially successful students in IT. For example, the analysis indicates questionnaire items associated with the challenge presented by an IT profession and family educational backgrounds in technical areas are important outcome predictors, while gender and age are less important.

关键词： Strategic planning

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Revealing a Country’s Government Discourse Through BERT-based Topic Modeling in the US Presidential Speeches 11

Revealing a Country’s Government Discourse Through BERT-bas...

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11th International Conference on Computer, Control, Informatics and its Applications, IC3INA 2024

作者： Zain, Rafi Mahmud Anggai, Sajarwo Tukiyat Musyafa, Ahmad Waskita, A.A. Graduate Program of Informatics Engineering Universitas Pamulang Pamulang Indonesia Research Center for Data and Information Sciences National Research and Innovation Agency Bandung Indonesia

ISBN: (纸本)9798331542313

This paper analyzes presidential speeches from the United States, delivered by the current president, Joe Biden, from his inauguration until April 3, 2024, using BERT-based topic modeling techniques. Since the role and actions of the United States affect global affairs, inferring latent topics from these speeches are important for making informed decisions and also useful to researchers. We provide experiments combining different embedding methods and clustering algorithms for dimensionality reduction. Our experiment results demonstrated that using DistilBERT embeddings followed by HDBSCAN clustering and UMAP dimensionality reduction consistently produced meaningful and interpretable topics, and this paper introduces the UMASS and NPMI metrics for evaluating topic coherence, with the best values of these metrics among the other schemes investigated. Some of the dominant themes conveyed in the American president’s state of the union speech that were successfully revealed in this study include international cooperation, alongside significant attention to environmental, community, health, and economic issues. © 2024 IEEE.

关键词： Embeddings

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Effect of parameters of phase-modulated M-sequence signal on direction-of-arrival and localization error

Effect of parameters of phase-modulated M-sequence signal on...

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2016 International Conference on Indoor Positioning and Indoor Navigation, IPIN 2016

作者： Ogiso, Satoki Kawagishit, Takuji Koichi, Mizutani Wakatsuki, Naoto Zempo, Keiichi Ph.D. Program in Empowerment Inforamatics School of Integrative and Global Majors University of Tsukuba Japan Graduate School of Systems and Information Engineering University of Tsukuba Japan Faculty of Engineering Information and Systems University of Tsukuba Japan

ISBN: (纸本)9781509024254

In this paper, signals for acoustic beacons with M sequence are evaluated with various parameters for self-localization of mobile robot. The effect of (i) baud rate, (ii) carrier frequency and (iii) order of M sequence on DOA estimation error and localization error are evaluated by computer simulation. As a result, localization is possible with same class or more precision compared to the result from sound beacon with three chirp signals within 5 kHz-18 kHz by choosing the appropriate parameters, which are (i)baud rate is more than around 8 kHz and (ii)carrier frequency is 10 kHz. Particularly, (i) baud rate and (ii) carrier frequency have influence on the localization error. However, the localization error do not change into even a further baud rate in this condition if baud rate is higher than carrier frequency. In this simulation, no influence is confirmed from (iii)order of M sequence. The result indicates that M sequence can be used as signal of acoustic beacons instead of chirp, which occupies frequency band. © 2016 IEEE.

关键词： Direction of arrival

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Performance of multimodal prediction models for intracerebral hemorrhage outcomes using real-world data

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International Journal of Medical Informatics 2025年 202卷 105989-105989页

作者： Matsumoto, Koutarou Suzuki, Masahiro Ishihara, Kazuaki Tokunaga, Koki Matsuda, Katsuhiko Chen, Jenhui Yamashiro, Shigeo Soejima, Hidehisa Nakashima, Naoki Kamouchi, Masahiro Department of Health Care Administration and Management Graduate School of Medical Sciences Kyushu University Fukuoka Japan Institute for Medical Information Research and Analysis Saiseikai Kumamoto Hospital Kumamoto Japan Graduate Degree Program of Applied Data Sciences Sophia University Tokyo Japan Department of Computer Science and Information Engineering Chang Gung University Taoyuan Taiwan Department of Pharmacy Saiseikai Kumamoto Hospital Kumamoto Japan Department of Radiology Saiseikai Kumamoto Hospital Kumamoto Japan Division of Neurosurgery Saiseikai Kumamoto Hospital Kumamoto Japan Medical Information Center Kyushu University Hospital Fukuoka Japan Department of Medical Informatics Graduate School of Medical Sciences Kyushu University Fukuoka Japan Center for Cohort Studies Graduate School of Medical Sciences Kyushu University Fukuoka Japan

Graphical abstract

关键词： Multimodal model Deep learning Machine learning Intracerebral hemorrhage

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Measurment of local strain field of a laminated rubber bearing under tensile axial loading 1

Measurment of local strain field of a laminated rubber beari...

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1st International Conference on Advances in Experimental Stuctural engineering, AESE 2005

作者： Shoji, Gaku Saito, Kei Kameda, Toshihiro Fueki, Takaaki Graduate School of Systems and Information Engineering University of Tsukuba Ibaraki305-8573 Japan Japan Research Institute Ltd. Tokyo102-0074 Japan Graduate School of Systems and Information Engineering University of Tsukuba Ibaraki305-8573 Japan Master’s Program in Science and Engineering Graduate School University of Tsukuba Ibaraki305-8573 Japan

ISBN: (纸本)4901887181

Effect of tensile axial loading on seismic performance (plastic shear deformation) of a laminated rubber bearing (LRB) was clarified. Cyclic loading tests were carried out to evaluate the relation between lateral force and lateral displacement of the LRB under seismic conditions (i.e., axial loading) and under worn conditions (i.e., 300 cycles). A strain measurement scheme based on image analysis was used to obtain the local strain fields of the LRB. Localized strain fields under tensile axial loading occurred more markedly at the corners of the free surface of the LRB than those under compressive axial loading. The seismic performance of the LRB under tensile or compressive axial loading was degraded severely after shear deformation incurred during 300 cycles. After 300 cycles, for the LRB under compressive axial loading, large localized shear strain fields occurred at the rubber layers underneath and on the inner steel plates, whereas, for the LRB under tensile axial loading, such large strain fields occurred at the rubber layers around the upper and lower steel plates. © 2005 EUCENTRE. All rights reserved.

关键词： Rubber

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