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arXiv 2020年

作者： Cheng, Hsu-Yung Kuo, Ping-Huan Shen, Yamin Huang, Chiou-Jye Department of Computer Science and Information Engineering National Central University Computer and Intelligent Robot Program for Bachelor Degree National Pingtung University School of Electrical Engineering and Automation Jiangxi University of Science and Technology

In the modern power market, electricity trading is an extremely competitive industry. More accurate price forecast is crucial to help electricity producers and traders make better decisions. In this paper, a novel method of convolutional neural network (CNN) is proposed to rapidly provide hourly forecasting in the energy market. To improve prediction accuracy, we divide the annual electricity price data into four categories by seasons and conduct training and forecasting for each category respectively. By comparing the proposed method with other existing methods, we find that the proposed model has achieved outstanding results, the mean absolute percentage error (MAPE) and root mean square error (RMSE) for each category are about 5.5% and 3, respectively. Copyright © 2020, The Authors. All rights reserved.

关键词： Power markets

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Application of 3-D nonlinear wave-load and structural-response simulations in naval ship design

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NAVAL ENGINEERS JOURNAL 1997年第3期109卷 253-266页

作者： Engle, A Lin, W Salvesen, N Shin, Y Allen H. Engle:is a naval architect in the Hydrodynamic Division of the Naval Sea Systems /Command (NavSea). He received his B.S. degree in engineering scinece from the State University of New York at Buffalo in 1977 and his M.S. degree in ocean engineering from the Unviersity of Hawaii in 1979. Corrently Mr. Engle is the program director of the Navy's Hydrodynamic Loads Technology Development Program. Mr. Engle is Chairman of SNAME Panel on Hull Loadings (HS-1) and contributing member to the International Ship and Offshore Structures Congress's Committee on Dynamics. Moei-Min Lin:is a senior research scientist at the Ship technology Division of Sciences Applications International Corporation (SAIC). He received his B.S. degree in naval architecture and marine engineering from the National Cheng-Kung University Taiwan in 1977 and his Ph.D. degree in ocean engineering from MIT in 1985. He is an expert in computational ship hydrodynamics. He has been the P.I. for development of the Large Amplitude Motions Program (LAMP) system. Nils Salvesen:is the manager of the Ship Technology Division of the Science Application International Corporation (SAIC).He received his B.S. and Ph.D. degree from the Development Naval Architecture and Marine Engineering of the University of Michigan in 1960 and 1966 respectively. He has more then thirty years of experience in the development of ship motion simulation and wave load prediction methods. More than twenty-five years ago he developed the original strip-theory code on which the Navy's ship motions program (SMP) is based. Yung-Sup Shin:is the principal engineer responsible for the hydrodynamic projects in the Research and Development Department of the American Bureau of Shipping New York. He received a Ph.D. degree in hydrodynamic from the Department of Naval Architecture and Marine Engineering of the University of Michigan. In the past eighteen years at ABS he has been involved in the theortical development and analysis of various marine hydrodynamic problems. In recent year

Despite the limits inherent within linearized frequency-domain ship motion and wave load computer codes, strip theory has been found to provide the design community with a fairly robust, practical design tool with reasonable accuracy for most conventional displacement monohulls. However, the advent of new design concepts including multi-hulls and application of new materials as well as the push to incorporate reliability methods within surface ship structural design criteria has highlighted the need for more rigorous methods of developing a lifetime load spectrum. In this paper, a multilevel computation system for predicting ship motions and wave loads, up through and including extreme sea conditions, is presented. This system includes a traditional strip theory approach and newly developed linear and nonlinear three-dimensional time-domain methods. The new nonlinear methods are currently in the process of being validated by the U.S. Navy. The status of the current development is presented. Sample numerical results from the new nonlinear methods are compared with both linear frequency domain predictions and model tests.

关键词： Naval vessels

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PV System Power Model Application in Smart Cities

PV System Power Model Application in Smart Cities

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IEEE International Conference on Knowledge Innovation and Invention (ICKII)

作者： Chiou-Jye Huang Min-Chan Hwang Hsin-Chuan Chen Ping-Huan Kuo School of Electrical Engineering and Automation Jiangxi University of Science and Technology Ganzhou China School of Computer Engineering University of Electronic Science and Technology of China Zhongshan Institute Zhongshan China Computer and Intelligent Robot Program for Bachelor Degree National Pingtung University Pingtung Taiwan

ISBN: (数字)9781728101101

ISBN: (纸本)9781728101231

The photovoltaic (PV) system energy generation is closely related to climate conditions, installation site, and system design. In this paper, a simple energy generation model is proposed and established by means of module temperature and solar irradiation, module temperature coefficient, module rated power, number of modules, and three correction coefficients including temperature derating coefficient, inverter conversion loss coefficient, and other loss coefficients. The experiment results show that the estimation model proposed in this paper has high accuracy using the Mean Absolute Percentage Error (MAPE) model as the evaluation index, the estimation model MAPE is 6.75%, while the PV SYST software simulation has MAPE of 11.90%. According to international MAPE evaluation standards, the method proposed in this paper has higher accuracy level than PV SYST software. This model can be used for the estimation of energy generation when installing solar PV systems, and can be used for the reasonable assessment of PV system long-term power generation, to predict system power generation anomalies, and reduce system abnormalities caused by downtime losses, and increase investment efficiency.

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Development of dynamically artificial flowers driven by shape memory alloy and pulse width modulation

Development of dynamically artificial flowers driven by shap...

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IEEE Workshop on Advanced Robotics and its Social Impacts, ARSO

作者： C. H. Pan Y. B. Wang H. Y. Pan Department of Mechanical Engineering National Chin-Yi University of Technology Taiwan ROC Institute of Mechanical Engineering National Chiao Tung University Taiwan ROC International Bachelor Degree Program on Energy National Cheng Kung University Taiwan ROC

Artificial flowers are mainly static objects. If we can make them movable with actuating mechanisms, sensors and controllers, this will make them more lively and entertaining. The aim of this paper is to develop artificial flower ornaments with dynamic, modular, programmable and green-energy characteristics. The dynamically artificial flower ornaments show the performances: bending of stems, blooming of petals, spreading of fragrance and flapping of butterflies. Besides, solar power to simulate photosynthesis (it is just an analogy to actual photosynthesis) will be used to energize the dynamically artificial flower ornaments. Instead of using conventional mechanisms and electromagnetic motor to actuate the flower ornaments, we use shape memory alloy (SMA) as actuators and pulse width modulation (PWM) as drive circuit to avoid complication, lager volume and noise generation of the components. Four types of the SMA actuators are made of SMA wire (Ti50%-Ni45%-Cu5%) with one way shape memory effect and 0.6mm in diameter. The performance of each SMA actuator is evaluated. By using PWM, the SMA actuators have high response time and low energy consumption in acting cycle.

关键词： Actuators Shape Pulse width modulation Temperature measurement Wires Robots Force measurement

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Meshless generalized finite difference method with a domain-decomposition method for solving Helmholtz equation and its application to caisson resonance problems

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ocean engineering 2023年 271卷

作者： Huang, Ji Lyu, Hong-Guan Chen, Jiahn-Horng Fan, Chia-Ming School of Naval Architecture and Maritime Guangdong Ocean University Zhanjiang524088 China School of Ocean Engineering and Technology Sun Yat-sen University Zhuhai519082 China Doctoral Degree Program in Ocean Engineering Technology National Taiwan Ocean University Keelung20224 Taiwan Shih Yen-Ping Center for Underwater Technology National Taiwan Ocean University Keelung20224 Taiwan National Academy of Marine Research Kaohsiung80661 Taiwan Department of Harbor and River Engineering National Taiwan Ocean University Keelung20224 Taiwan

This paper aims at presenting a meshless Generalized Finite Difference Method (GFDM) for solving the Helmholtz equation. In particular, in order to tackle the problem where a fluid domain is divided into different parts by a thin-wall structure, a Domain-Decomposition Method (DDM) is introduced to prevent interactions between node pairs coming from different parts of the flow domain. Two rigorous benchmarks are performed to validate the convergence and accuracy of the present GFDM-DDM model. Furthermore, caisson resonance problems are also investigated and discussed based on the novel numerical tool. It is shown that the present GFDM-DDM model can provide satisfactory predictions for resonance modes in caisson resonance problems, and hence can be treated as a powerful numerical tool in ocean engineering design due to its accurate and efficient characteristics. © 2023 The Authors

关键词： Caissons

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GAS PRODUCTION AND TURBIDITY DURING UNDERWATER SHIELDED METAL-ARC WELDING WITH IRON POWDER ELECTRODES

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NAVAL ENGINEERS JOURNAL 1971年第6期83卷 59-&页

作者： SILVA, EA The authorwas recently awarded a Ph.D. Degree in the Ocean Engineering Program at the University of California Berkeley. He graduated from Stanford University with a Bachelor of Science Degree in Metallurgical Engineering in 1960 followed by a Master of Science Degree in Materials Science tn 1961. Dr. Silva has experience as a Materials Engineer in the aerospace industry and is an Engineering Duty Officer in the U.S. Naval Reserve. He is a member of the ASNE A1ME ASM AWS MTS SNAME and USNI.

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WELDING PROCESSES IN DEEP ocean

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NAVAL ENGINEERS JOURNAL 1968年第4期80卷 561-&页

作者： SILVA, EA THE AUTHOR:is studying for a Ph.D. Degree in the Ocean Engineering program of the University of California at Berkeley. He graduated from Stanford University in 1961 with a Bachelor of Science Degree in Metallurgical Engineering and a Master of Science Degree in Materials Science. Silva is an Engineering Duty Officer in the Naval Reserve and has civilian experience as a Materials Engineer in the aerospace industry. He is a member of the ASNE ASM SNAME AIME and the U. S. Naval Institute.

T his paper anticipates a future need for welding processes in depths to 5000 meters. Arc cutting and joining processes are found to be the most suitable for depths in excess of 1500 meters because they avoid the problem of gas liquification. The underwater arcs are enhanced by constricting effects produced by the deep ocean environment, and no problem with heat generation is expected. Argon or nitrogen shielded arcs are advised for deep sea work. Their use can lead to reduced power requirements, control of penetration and metal transfer rate, and a reduction in porosity and slag inclusions. The cumbersome diving dress required to offset the cold and the problem of visibility in bottom waters is expected to produce the most serious operating difficulties for the welders. Cryogenic gas transport and experimentation in the laboratory and at sea are recommended.

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Momentum investing and a tale of intraday and overnight returns: Evidence from Taiwan

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Pacific Basin Finance Journal 2023年 82卷

作者： Ho, Hsiao-Wei Hsiao, Yu-Jen Lo, Wen-Chi Yang, Nien-Tzu Bachelor Degree Program in Ocean Business Management National Taiwan Ocean University Keelung Taiwan Executive Master Program of Business Administration in Biotechnology College of Management Taipei Medical University Taipei Taiwan Financial Technology Applications Program Ming Chuan University Taoyuan Taiwan Department of Business Management National United University Miaoli Taiwan

The Taiwan stock market has been widely documented as a remarkable exception of the momentum effect. In this paper, we analyze whether the information contained in past intraday and overnight returns affects future stock returns in different ways. Specifically, we propose that investors tend to underreact to intraday information while overreact to overnight information. Accordingly, we construct two momentum strategies based on past intraday and overnight returns, namely the intraday momentum (IMOM) and overnight momentum (OMOM). We show that the IMOM strategy generates significantly positive returns while the OMOM strategy generates significantly negative returns, and that such phenomena exist up to one year. We further confirm that the IMOM profits are induced by investor underreaction while the OMOM reversals are due to investors' price correction of initial overreaction. Finally, we show that a major advantage of the IMOM strategy is that its profitability is stable over time and is less prone to the momentum crashes. © 2023 Elsevier B.V.

关键词： Intraday return Investor underreaction Momentum Overnight return Taiwan stock market

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Building a Winning Business Case for Standards Adoption

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IEEE engineering Management Review 2020年第1期48卷 14-17页

作者： Bishop, David David Bishop (Senior Member IEEE) received the Bachelor of Computer Engineering degree from the Georgia Institute of Technology Atlanta GA USA and the M.B.A. degree with a concentration in IT management and a doctorate degree in business administration from Georgia State University Atlanta GA USA. He is a Technologist Consultant Researcher Entrepreneur and Instructor with more than 25 years of experience in telecommunications transportation government and utility industries. He is the author of Metagility: Managing Agile Development for Competitive Advantage Elizabeth's Song The Big Brother's Guides and numerous other books and articles. He is a frequent contributor to Ieee's Engineering Management Review and an inventor of several U.S. patents. He is the CEO and Founder of Agile Worx LLC a firm that provides program and project management software tools training and consulting services. He is a member and Committee Chair for the International Electrotechnical Commission (IEC) based in Geneva Switzerland a member of ANSI and the Association for Computing Machinery. David is also a Research Associate with the Center for Engaged Business Research Georgia State University and the Founding Chair for the Atlanta chapter of the IEEE Technology and Engineering Management Society.

In a recent issue of Ieee engineering Management Review, we explored the problem of building a winning business case and the elements that can differentiate an 'average' business case from a 'winning' one. For this second installment, we will show how these winning elements were applied in practice. To make it even more interesting, we will illustrate how this can be accomplished with arguably one of the most difficult cases to make: adoption of technical standards. Our stakeholder is a large power utility. © 1973-2011 IEEE.

关键词： Task analysis Acceleration

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Hull material evaluation for Navy 44 sail training craft

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NAVAL ENGINEERS JOURNAL 2001年第2期113卷 71-78页

作者： Arvidson, MH Miller, PH Mark H. Arvidson graduated from Minnetonka High School in 1996 and shortly thereafter enlisted in the Navy. He graduated first academically from the Naval Recruit Training Command and completed Navy Nuclear Power “A” School as a third-class Petty Officer in the machinist's mate rating. He graduated from the United States Naval Academy in 2001 with a bachelor of science degree in naval architecture and plans on returning to the sub-marine community. He is a member of the American Society of Naval Engineers and Society of Naval Architects and Marine Engineers. Personal accomplishments include designing and building a sixteen-foot sailboat and commanding boats on the Varsity Offshore Sailing Team at the USNA. Paul H. Miller is an assistant professor of naval architecture at the United States Naval Academy and a researcher in the area of marine composites. He completed a bachelor of science degree in mechanical engineering at Tufts University in 1985 and a master of engineering in ocean engineering at Stevens Institute of Technology in 1987. After working on a variety of small craft design projects he joined Newport News Shipbuilding in 1989 and participated in the design of components for submarines carriers and commercial vessels. In 1992 he joined the design effort for Team Dennis Conner's America's Cup Defense. In 1994 he earned a master of engineering degree in naval architecture and in 2000 earned a doctorate in civil engineering from the University of California at Berkeley where his dissertation was on the prediction and verification of fatigue effects on composite hulls. He has participated in the design of more than two dozen composite vessels. A former section officer and current T&R panel chairman in SNAME he is also a member of ASNE and ASEE.

Material characterization tests were performed at the U.S. Naval Academy to identify a toughened laminate for the new Navy 44-foot sail training vessels. After preliminary analysis using classical lamination theory, four different cores, five laminates and seven resin systems were tested in UV exposure, four-point bending, lateral panel pressure, and simulated bow impact. Results showed substantial improvements in strength, toughness, cost and weight were possible over the existing laminate, with the lightest acceptable laminate yielding a weight savings equivalent to 3.5% of the vessel's displacement.

关键词： Naval vessels

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