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A study on the improvement and application of system dynamics model for demand forecasting of ships

A study on the improvement and application of system dynamic...

RINA, Royal Institution of Naval Architects - International Conference on Computer Applications in Shipbuilding 2017, ICCAS 2017

作者： Wada, Y. Hamada, K. Hirata, N. Knowledge and Data System Department National Maritime Research Institute Japan Graduate School of Engineering Hiroshima University Japan

ISBN: (纸本)9781909024670

Shipbuilding is an industry in which the change in demand has been extremely drastic. Therefore, it is important to develop a method of demand forecasting for new ships in order to realize sustainable development of the shipbuilding industry. Recently, sufficient actual data on the shipbuilding market has become available, and it is expected to define an accurate demand-forecasting model by using these data. In this study, the system dynamics model of previous study is improved by using latest market data, and optimal measures planning system for shipbuilding industry is developed based on the proposed model. Thereby, some simulations using the proposed demand-forecasting model and system are conducted, and the effectiveness of proposed model and system are shown. © 2017: The Royal Institution of Naval Architects.

关键词： Shipbuilding

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Adaptive class association rule mining for human activity recognition 6

Adaptive class association rule mining for human activity re...

引用

6th International Workshop on Mining Ubiquitous and Social Environments, MUSE 2015

作者： Atzmueller, Martin Kibanov, Mark Hayat, Naveed Trojahn, Matthias Kroll, Dennis University of Kassel Research Center for Information System Design Knowledge and Data Engineering Group Kassel Germany Volkswagen AG Wolfsburg Germany University of Kassel Research Center for Information System Design Department for Communication Technology Kassel Germany

The analysis of human activity data is an important research area in the context of ubiquitous and social environments. Using sensor data obtained by mobile devices, e. g., utilizing accelerometer sensors contained in mobile phones, behavioral patterns and models can then be obtained. However, the utilized models are often not simple to interpret by humans in order to facilitate assessment, evaluation and validation, e. g., in computational social science or in medical contexts. In this paper, we propose a novel approach for generating interpretable rule sets for classification: We present an adaptive framework for mining class association rules using subgroup discovery, and analyze different techniques for obtaining the final classifier. The approach is investigated in the context of human activity recognition. For our evaluation, we apply real-world activity data collected using mobile phone sensors. Copyright © 2015 by the paper's authors.

关键词： Cellular telephones

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Rescue Transportation Simulator and Analytical Solution in the Event of Disasters

Rescue Transportation Simulator and Analytical Solution in t...

引用

SICE Annual Conference

作者： Takahiro Majima Taro Aratani Knowledge and Data System Department National Maritime Research Institute Tokyo Japan

In recent years, natural disasters such as earthquakes and typhoons have occurred frequently in Japan. In the case of a large-scale disaster, prompt and efficient rescue activities are required to protect the lives of the victims. In response to such natural disasters, the government and local governments formulate disaster prevention plans while considering the characteristics of each region to prepare for the occurrence of disasters. The authors reported a rescue transportation simulator and analytical solution to estimate transportation performance considered in the disaster prevention plan. In the simulator, α vehicle set was introduced. However, the analytical solution did not consider the set. The α vehicle set is necessary to efficient vehicle dispatch, because the fastest vehicle that can reach the next rescue location is selected from the set. In this paper, the analytical solution is modified to estimate the effect of the α vehicle set. Using these tools, the analyses are carried out for a simple problem to validate the modified analytical solution. In addition, the tools are applied to a condition of disaster prevention plan of a city, envisaging a Tokyo Inland Earthquake. Transportation capability for the injured people is quantitatively clarified under multiple scenarios. The user of those analytical tools can consider more effective measures of rescue operation.

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Distributed forward-backward (half) forward algorithms for generalized Nash equilibrium seeking

Distributed forward-backward (half) forward algorithms for g...

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European Control Conference (ECC)

作者： Barbara Franci Mathias Staudigl Sergio Grammatico Delft Center for System and Control TU Delft The Netherlands Department of Data Science and Knowledge Engineering Maastricht University The Netherlands

ISBN: (数字)9783907144022

ISBN: (纸本)9781728188133

We present two distributed algorithms for the computation of a generalized Nash equilibrium in monotone games. The first algorithm follows from a forward-backward-forward operator splitting, while the second, which requires the pseudo-gradient mapping of the game to be cocoercive, follows from the forward-backward-half-forward operator splitting. Finally, we compare them with the distributed, preconditioned, forward-backward algorithm via numerical experiments.

关键词： Games Nash equilibrium Cost function Couplings Symmetric matrices Europe Distributed algorithms

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Formation and temporal evolution of social groups during coffee breaks 1

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5th International Workshop on Mining Ubiquitous and Social Environments, MUSE 2014

作者： Atzmueller, Martin Ernst, Andreas Krebs, Friedrich Scholz, Christoph Stumme, Gerd Knowledge and Data Engineering Group Research Center for Information System Design University of Kassel Wilhelmshöher Allee 73 Kassel34121 Germany Center for Environmental Systems Research University of Kassel Wilhelmshöher Allee 47 Kassel34117 Germany Department Energy Informatics and Information Systems Fraunhofer Institute for Wind Energy and Energy System Technology Königstor 59 Kassel34119 Germany

ISBN: (数字)9783319290096

ISBN: (纸本)9783319290089

Group formation and evolution are prominent topics in social contexts. This paper focuses on the analysis of group evolution events in networks of face-to-face proximity. We first analyze statistical properties of group evolution, e.g., individual activity and typical group sizes. After that, we define a set of specific group evolution events. These are analyzed in the context of an academic conference, where we provide different patterns according to phases of the conference. Specifically, we investigate group formation and evolution using real-world data collected at the LWA 2010 conference utilizing the Conferator system, and discuss patterns according to different phases of the conference. © Springer International Publishing Switzerland 2016.

关键词： Computers

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Capability description and discovery of Internetware entity

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Science China(Information Sciences) 2010年第4期53卷 685-703页

作者： WANG PuWei1*, JIN Zhi2,3* & LIU HongYan4 1Key Laboratory of data Engineering and knowledge Engineering of the Ministry of Education, Renmin University of China, Beijing 100872, China 2Key Laboratory of High Confidence Software Technologies of the Ministry of Education, Peking University, Beijing 100871, China 3Academy of Mathematics and system Sciences, Chinese Academy of Sciences, Beijing 100190, China 4department of Management Science and Engineering, Tsinghua University, Beijing 100084, China 1. Key Laboratory of Data Engineering and Knowledge Engineering of the Ministry of Education Renmin University of China Beijing 100872 China2. Key Laboratory of High Confidence Software Technologies of the Ministry of Education Peking University Beijing 100871 China3. Academy of Mathematics and System Sciences Chinese Academy of Sciences Beijing 100190 China4. Department of Management Science and Engineering Tsinghua University Beijing 100084 China

Internetware can be formed through aggregation of Internetware entities bottom-up to satisfy the user's requirements. In the process, capability description of Internetware entity plays an important role. This paper proposes a capability description of Internetware entity based on environment ontology. The environment ontology includes environment entities and possible interactions with the environment entities in a particular domain. Tree-like hierarchical state machines are also included in the ontology to describe domain life-cycle of the environment entities. On the basis of the ideas, the capability of Internetware entity is embodied by interacting with environment entities and the changes of the environment entities during the interactions. Finally, this paper describes the matchmaking between capability descriptions of Internetware entities to support the discovery of Internetware entity. An example of online education course is given to illustrate the ideas.

关键词： Internetware capability description domain environment ontology tree-like hierarchical state machine

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Aerial Active STAR-RIS-assisted Satellite-Terrestrial Covert Communications

arXiv

引用

arXiv 2025年

作者： Zhang, Chuang Sun, Geng Li, Jiahui Wang, Jiacheng Zhang, Ruichen Niyato, Dusit Mao, Shiwen Quek, Tony Q.S. Computer Science and Technology Jilin University Changchun130012 China Singapore University of Technology and Design Singapore487372 Singapore College of Computer Science and Technology Jilin University Changchun130012 China College of Computing and Data Science Nanyang Technological University Singapore639798 Singapore Key Laboratory of Symbolic Computation and Knowledge Engineering of Ministry of Education Jilin University Changchun130012 China Department of Electrical and Computer Engineering Auburn University AuburnAL36849 United States Information System Technology and Design Pillar Singapore University of Technology and Design Singapore487372 Singapore

An integration of satellites and terrestrial networks is crucial for enhancing performance of next generation communication systems. However, the networks are hindered by the long-distance path loss and security risks in dense urban environments. In this work, we propose a satellite-terrestrial covert communication system assisted by the aerial active simultaneous transmitting and reflecting reconfigurable intelligent surface (AASTAR-RIS) to improve the channel capacity while ensuring the transmission covertness. Specifically, we first derive the minimal detection error probability (DEP) under the worst condition that the Warden has perfect channel state information (CSI). Then, we formulate an AASTAR-RIS-assisted satellite-terrestrial covert communication optimization problem (ASCCOP) to maximize the sum of the fair channel capacity for all ground users while meeting the strict covert constraint, by jointly optimizing the trajectory and active beamforming of the AASTAR-RIS. Due to the challenges posed by the complex and high-dimensional state-action spaces as well as the need for efficient exploration in dynamic environments, we propose a generative deterministic policy gradient (GDPG) algorithm, which is a generative deep reinforcement learning (DRL) method to solve the ASCCOP. Concretely, the generative diffusion model (GDM) is utilized as the policy representation of the algorithm to enhance the exploration process by generating diverse and high-quality samples through a series of denoising steps. Moreover, we incorporate an action gradient mechanism to accomplish the policy improvement of the algorithm, which refines the better state-action pairs through the gradient ascent. Simulation results demonstrate that the proposed approach significantly outperforms important benchmarks, and also validate the performance and practicality under different algorithm parameters and environment settings. Copyright © 2025, The Authors. All rights reserved.

关键词： Deep reinforcement learning

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Neural networks for semantic gaze analysis in XR settings

arXiv

引用

arXiv 2021年

作者： Stubbemann, Lena Dürrschnabel, Dominik Refflinghaus, Robert Department of Quality and Process Management University of Kassel Germany Knowledge & Data Engineering Group University of Kassel Germany Interdisciplinary Research Center for Information System Design University of Kassel Germany

Virtual-reality (VR) and augmented-reality (AR) technology is increasingly combined with eye-tracking. This combination broadens both fields and opens up new areas of application, in which visual perception and related cognitive processes can be studied in interactive but still well controlled settings. However, performing a semantic gaze analysis of eye-tracking data from interactive three-dimensional scenes is a resource-intense task, which so far has been an obstacle to economic use. In this paper we present a novel approach which minimizes time and information necessary to annotate volumes of interest (VOIs) by using techniques from object recognition. To do so, we train convolutional neural networks (CNNs) on synthetic data sets derived from virtual models using image augmentation techniques. We evaluate our method in real and virtual environments, showing that the method can compete with state-of-the-art approaches, while not relying on additional markers or preexisting databases but instead offering cross-platform *** Codes 68T45 Copyright © 2021, The Authors. All rights reserved.

关键词： Semantics

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A relaxed-inertial forward-backward-forward algorithm for stochastic generalized Nash equilibrium seeking

arXiv

引用

arXiv 2021年

作者： Cui, Shisheng Franci, Barbara Grammatico, Sergio Shanbhag, Uday V. Staudigl, Mathias Department of Industrial and Manufacturing Engineering Pennsylvania State University University ParkPA16802 United States Delft Center for System and Control TU Delft Netherlands Department of Data Science and Knowledge Engineering Maastricht University Netherlands

In this paper we propose a new operator splitting algorithm for distributed Nash equilibrium seeking under stochastic uncertainty, featuring relaxation and inertial effects. Our work is inspired by recent deterministic operator splitting methods, designed for solving structured monotone inclusion problems. The algorithm is derived from a forward-backward-forward scheme for solving structured monotone inclusion problems featuring a Lipschitz continuous and monotone game operator. To the best of our knowledge, this is the first distributed (generalized) Nash equilibrium seeking algorithm featuring acceleration techniques in stochastic Nash games without assuming cocoercivity. Numerical examples illustrate the effect of inertia and relaxation on the performance of our proposed algorithm. © 2021, CC BY.

关键词： Game theory

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Drawing Order Diagrams Through Two-Dimension Extension

引用

Journal of Graph Algorithms and Applications 2023年第9期27卷 783-802页

作者： Dürrschnabel, Dominik Hanika, Tom Stumme, Gerd Knowledge & Data Engineering Group Research Center for Information System Design & Department of Electrical Engineering and Computer Science University of Kassel Germany Institute of Computer Science University of Hildesheim Germany Berlin School of Library and Information Science Humboldt-Universität zu Berlin Germany

Ordinal real-world data such as concept hierarchies, ontologies, genealogies, or task dependencies in scheduling often has the property to not only contain pairwise comparable, but also incomparable elements. Order diagrams provide an important tool for understanding and thus discovering knowledge in such data. Easily readable drawings of such order diagrams are hard to come by, even for small ordered sets. Many attempts were made to transfer classical graph drawing approaches to order diagrams. Although these methods produce satisfying results for some ordered sets, they unfortunately perform poorly in general. In this work, we present the novel algorithm DimDraw to decompose an ordered set (e.g., a concept hierarchy) in linear orders and to produce a corresponding order diagram. This algorithm is based on a relation between the dimension of an ordered set and the bipartiteness of its transitive incompatibility graph. To evaluate the quality of the algorithm, a user study was conducted where generated drawings were compared with ones from state-of-the-art drawing algorithms. © 2023 Brown University. All rights reserved.

关键词： Set theory

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