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Proceedings of the Winter Simulation Conference

作者： Xingyu Ren Michael C. Fu Dept. of Electrical and Computer Eng. & Institute for System Research University of Maryland College Park MD USA Dept. of Electrical and Computer Eng. & Institute for System Research University of Maryland College Park MD USA and Robert H. Smith School of Business University of Maryland College Park MD USA

ISBN: (纸本)9798331534202

We generalize the generalized likelihood ratio (GLR) method through a novel push-out Leibniz integration approach. Extending the conventional push-out likelihood ratio (LR) method, our approach allows the sample space to be parameter-dependent after the change of variables. Specifically, leveraging the Leibniz integral rule enables differentiation of the parameter-dependent sample space, resulting in a surface integral in addition to the usual LR estimator, which may necessitate additional simulation. Furthermore, our approach extends to cases where the change of variables only "locally" exists. Notably, the derived estimator includes existing GLR estimators as special cases and is applicable to a broader class of discontinuous sample performances. Moreover, the derivation is streamlined and more straightforward, and the requisite regularity conditions are easier to understand and verify.

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ms-Mamba: Multi-scale Mamba for Time-Series Forecasting

arXiv

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arXiv 2025年

作者： Karadag, Yusuf Meric Kalkan, Sinan Dino, Ipek Gursel Dept. of Computer Eng. ROMER Robotics Center Middle East Technical University Turkey Dept. of Architecture ROMER Robotics Center Middle East Technical University Turkey

The problem of Time-series Forecasting is generally addressed by recurrent, Transformer-based and the recently proposed Mamba-based architectures. However, existing architectures generally process their input at a single temporal scale, which may be sub-optimal for many tasks where information changes over multiple time scales. In this paper, we introduce a novel architecture called Multi-scale Mamba (ms-Mamba) to address this gap. ms-Mamba incorporates multiple temporal scales by using multiple Mamba blocks with different sampling rates (∆s). Our experiments on many benchmarks demonstrate that ms-Mamba outperforms state-of-the-art approaches, including the recently proposed Transformer-based and Mamba-based models. Codes and models will be made available. Copyright © 2025, The Authors. All rights reserved.

关键词： Time series

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Advanced Tutorial on Paratemporal Simulation Using Tree Expansion 24

Advanced Tutorial on Paratemporal Simulation Using Tree Expa...

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Proceedings of the Winter Simulation Conference

作者： Bernard Zeigler Christian Koertje Cole Zanni Sangwon Yoon Gerardo Dutan Dept. of Electrical and Computer Eng. University of Arizona Tucson AZ USA and RTSync Corp. Chandler AZ USA Dept. Physics University of Massachusetts Amherst Amherst MA USA Dept. of System Science and Industrial Eng. SUNY Binghamton University Binghamton NY USA

ISBN: (纸本)9798331534202

Stochastic simulations require large amounts of time to generate enough trajectories to attain statistical significance and estimate desired performance indices with satisfactory accuracy. They require search spaces with deep uncertainty arising from inadequate or incomplete information about the system and the outcomes of interest. Paratemporal methods efficiently explore these large search spaces and offer an avenue for speedup when executed in parallel. However, combinatorial explosion of branching arising from multiple choice points presents a major hurdle that must be overcome to implement such techniques. In this advanced tutorial we show how to tackle this scalability problem by applying a systems theory-based framework covering both conventional and newly developed paratemporal tree expansion algorithms for speeding up discrete event system stochastic simulations while preserving the desired accuracy.

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Implementation of an obstacle avoidance system based on a low-cost lidar sensor for autonomous navigation of an unmanned ship

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Transactions of the Korean Institute of Electrical eng.neers 2019年第3期68卷 480-488页

作者： Song, HyunWoo Lee, Kwangkook Kim, Dong Hun Dept. of Electrical Eng. Kyungnam University Korea Republic of Dept. of Mechatronics Eng. Kyungnam University Korea Republic of Dept. of Naval Architecture and Ocean System Eng Kyungnam University Korea Republic of

- In this paper, we propose an obstacle avoidance system for an unmanned ship to navigate safely in dynamic environments. Also, in this paper, one-dimensional low-cost lidar sensor is used, and a servo motor is used to implement the lidar sensor in a two-dimensional space. The distance and direction of an obstacle are measured through the two-dimensional lidar sensor. The unmanned ship is controlled by the application at a Tablet PC. The user inputs the coordinates of the destination in Google maps. Then the position of the unmanned ship is compared with the position of the destination through GPS and a geomagnetic sensor. If the unmanned ship finds obstacles while moving to its destination, it avoids obstacles through a fuzzy control-based algorithm. The paper shows that the experimental results can effectively construct an obstacle avoidance system for an unmanned ship with a low-cost LiDAR sensor using fuzzy control. Copyright © The Korean Institute of Electrical eng.neers

关键词： Fuzzy control

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Verification and validation of cyclic shear-bending analysis of CFT-column using E-simulator

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AIJ Journal of Technology and Design 2020年第63期26卷 490-495页

作者： Fujiwara, Jun Ohsaki, Makoto Tagawa, Hiroyuki Miyamura, Tomoshi Yamashita, Takuzo Japan Dept. of Architecture and Architectural Eng. Kyoto Univ. Japan Dept. of Architecture Mukogawa Women's Univ. NIED Japan Dept. of Computer Science College of Eng. Nihon Univ. NIED Japan

In this paper, cyclic shear-bending analysis of concrete-filled-tube (CFT) column using E-Simulator, which is a large-scale detailed finite element analysis system developed by NIED, is verified and validated. The solid element mesh is verified by varying types and sizes of solid elements. The effects of element types and sizes on analytical results are discussed. Two cases of experiment under variable axial load are simulated for validation. By comparing analytical and experimental results, it is shown that, the cyclic shear-bending behaviors are reproduced by E-Simulator. The computed internal damage of filled concrete is visualized and discussed. © 2020 Architectural Institute of Japan. All rights reserved.

关键词： Simulators

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Estimation of load-deflection characteristics on steel-framed bearing walls

Journal of Structural and Construction Engineering

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Journal of Structural and Construction eng.neering 2017年第741期82卷 1777-1785页

作者： Okada, Hisayuki Nomaki, Takayuki Dept. of Architecture Faculty of Eng. Aichi Institute of Technology Japan UNION SYSTEM Inc. Development Division Japan

The bearing walls of steel-framed houses are composed of thin-thick steel frames, sheets such as plywood and drilling screws for fasteners. The sheet to frame joints fastened by drilling screws bring up the complicated behavior of bearing walls, Therefore, structural properties of the bearing walls have to be estimated by full-scale experiments to design steel-framed houses. In order to estimate those properties without experiments, it is needed to make clear sufficiently about the bearing mechanism of walls. In this paper, on the basis of studies on full-scale experiments by authors, it will be discussed the simple method which can be easily estimated the characteristics of load-deflection relationship on steel-framed bearing walls. Furthermore, the effectiveness of the proposed method is discussed by comparisons of experiments. On the bearing walls subjected to horizontal load H, the displacement u is given by the sum of three components (Fig.2). These are displacement ub caused by bending, displacement us by the shearing of sheet and displacement un caused by slip-displacement of sheet to frame joints. The experimental study14) showed that the displacement un govern the elasto-plastic behavior of whole bearing walls. Then, it becomes important to estimate the displacement un for the bearing walls subjected to horizontal load H. The curve of H-un relationship can be calculated by Eq.(3)-Eq.(6) using numerical calculation of Fig.6. Eq.(3) is derived geometrical relations with the sheet and framing members in Fig.4. Eq.(6) are derived from the equations of equilibrium for the fastener forces acting at each framing members (Fig.5). The example of the numerical calculation (Fig.7) is indicated that the figure of H-un curve is similar to that of f-G curve of drilling screw joints, which is idealized to multi-linear type. The repeated calculations are not practical for design of the steel-framed bearing walls. To achieve the simple method, f-G curves and the H-un curves

关键词： Houses

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Finite element analysis of square concrete-filled-tube column under cyclic shear-bending considering compressive damage of concrete

Journal of Structural and Construction Engineering

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Journal of Structural and Construction eng.neering 2019年第755期84卷 29-37页

作者： Fujiwara, Jun Ohsaki, Makoto Tagawa, Hiroyuki Miyamura, Tomoshi Yamashita, Takuzo NIED Japan Dept. of Architecture and Architectural Eng. Kyoto Univ. Japan Dept. of Architecture Mukogawa Womens Univ Japan Dept. of Computer Science Nihon Univ. Japan

A finite element analysis of a square concrete-filled-tube (CFT) column under cyclic shear-bending loading is conducted. The concrete constitutive model proposed by the authors, which has extended Drucker-Prager yield surface and a simple damage criterion for representing softening behavior in compression, is updated. A reproducing analysis of a static cyclic bending experiment of a CFT column is performed. The load-deformation relations obtained from the experimental and numerical results are compared. From the numerical result, the damage progress of the filled concrete and the steel-concrete interaction are visually illustrated and discussed. © 2019 Architectural Institute of Japan. All rights reserved.

关键词： Finite element method

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Metadata standard interoperability: Application in the geographic information domain

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computers, Environment and Urban systems 2004年第6期28卷 611-634页

作者： Nogueras-Iso, J. Zarazaga-Soria, F.J. Lacasta, J. Béjar, R. Muro-Medrano, P.R. Dept. of Computer Sci./System Eng. University of Zaragoza María de Luna 1 50018 Zaragoza Spain

The use of metadata expands on the opportunities for interoperability. Interoperability involves making multiple information sources access, manipulate and share data across their boundaries. Metadata descriptions from different domains are not semantically distinct but overlap and relate to each other in complex ways. As the number, size and complexity of the metadata standards grow, the task of facilitating metadata in different standards becomes more difficult and tedious. A possible solution for this problem is the creation of mechanisms that enable the translation of this information in order to make it conform to the different standards. These mechanisms are denominated "crosswalks" and the objective of this work is to present the process of "crosswalk-creation", which has been used by a research team at the University of Zaragoza in order to translate information among some of the most extended standards for geographic information metadata. © 2004 Elsevier Ltd. All rights reserved.

关键词： Interoperability

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Load settlement relationships for circular footings considering the dilatancy characteristics of sand

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Technology Reports of Kansai University 2012年第54期 119-130页

作者： Tomita, Yusuke Masui, Takeshi Nishigata, Tatsuaki Yao, Shintaro Graduate School of Engineering Kansai Univ. Japan Dept. of Architecture Faculty of Environmental and Urban Eng. Kansai Univ. Suita Osaka Japan Dept. of Civil Environmental and Applied System Eng. Faculty of Environmental and Urban Eng. Kansai Univ. Dr. Eng. Japan Kansai Univ. Dr. Eng. Japan

To elucidate the mechanical properties of load-settlement relationships for spread foundations on sand, experimental and analytical studies of the strain hardening and dilatancy of sand are needed. Here we present theoretical properties derived from experiments using a circular footing model and computer simulations. The experiments were performed by vertically loading the circular footing when resting on sand, and used the relative densities of the sand and the tank dimensions as parameters. The quantitative relationships between load and settlement were analyzed with Finite Element Method (FEM) simulations using an SMP-Cam-Clay model, which can estimate sand dilatancy. The results are summarizedas follows: with both dense and loose sand models, before reaching the ultimate load, the load-settlement relationship obtained via FEM simulation agreed with that obtained by experiment. After reaching the ultimate load, the load-settlement relationship obtained from the experiment agreed with "Terzaghi' shearing capacityline". With the medium-densesand models, some binding effect caused by the soil tank rectangle was observed, possibly due to the positive dilatancy of the sand, which steadily occurred as the settlement progressed.

关键词： Sand

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Proposal of streng.h evaluation method for wall clay with core samples in situ

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AIJ Journal of Technology and Design 2019年第59期25卷 45-50页

作者： Ochi, Takayuki Utsunomiya, Naoki Miyamoto, Mitsuhiro Matsushima, Manabu Dept. of Residential Environment Shikoku Polytechnic College Japan Program in Architecture Civil and Environmental Eng Dept. of Eng. and Design Kagawa Univ. Japan Dept. of Architectural System Technology Kinki Polytechnic College Japan

In this study, an evaluation method based on box shear tests is developed to estimate the mechanical characteristics, such as the cohesion or angle of internal friction, of wall clay used for mud walls in the existing houses. The core samples of wall clay extracted from the existing houses in Marugame City are used for the box shear tests as a specimen. The wall clay is also extracted and mixed with water used for unconfined compression tests. The results of the box shear tests and unconfined compression tests are presented and discussed. The results of box shear tests is similar to that of unconfined compression tests, although they show a little variations. © 2019 Architectural Institute of Japan. All Rights Reserved.

关键词： Compression testing

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