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'My Entire Life Has Been Influenced By The Space Industry’ | College Of Engineering, Usu College Of Engineering

College of Engineering News

Published in Creating Tomorrow – Oct. 15, 2016 – Jessica Gregory remembers looking up on her way to elementary school and seeing rockets blaze into the morning skies. She was raised near Santa Maria, Calif., in the 1980s at a time when rocket launches from nearby Vandenberg Air Force Base were a common sight.

I'M Not What You Think I Am | College Of Engineering, Usu College Of Engineering

College of Engineering News

Published in Creating Tomorrow – Oct 15, 2016 – Stacie Gregory was always a good student. Math and science came easy to the Indianapolis, Ind., native who went on to earn an undergraduate degree in physics from Spelman College and a master’s in material science and engineering from Georgia Institute of Technology.

She even kept up with a strenuous workload as a PhD student at North Carolina State University in the late 1990s. But despite meeting academic goals, Gregory felt a growing burden that held her back and ultimately led her to drop out of the program. What happened? She …

Generation Control Schemes For Preventing Overloading Of Ehv Substation Main Transformer, Yi-Kuan Ke, Pei-Hwa Huang

Journal of Marine Science and Technology–Taiwan

The main purpose of this paper is to study the control of power plant generation under outage of main transformer in the adjoining substation. The control of power plant generation aims to prevent overloading of the remaining transformer and hence to maintain system operation security. The proposed control methods include two schemes of operation on the generating units: Direct Transfer Trip (DTT) and Generation Reduction (GR). A sample local power system with an EHV substation and two generation plants is investigated and thus the two control schemes are illustrated by analyzing system power flow and system dynamics. It is found …

Mechanical Behaviors Of Piled-Raft Foundation And Diaphragm Wall In Deep Excavation Of Taipei Metropolitan, Der-Guey Lin, Wen-Tsung Liu, Jui-Ching Chou

Journal of Marine Science and Technology–Taiwan

The piled-raft foundation has been widely used in recent years to solve the low bearing capacity and the excess settlement problems of the raft foundation on the soft soil. The soft soil is reinforced by the pile and behaviors of the diaphragm wall and the raft are also modified by the pile. However, effects of the pile on the diaphragm wall and the raft have not been fully discussed in the past. In this paper, a finite element program, Plaxis-3D, is used as the numerical simulation tool. First, simulations of pile loading tests are performed to verify the input parameters …

Application Of An Extension Neural Network Method For Fault Diagnosis Of Three-Level Inverters Used In Marine Vessels, Kuei-Hsiang Chao, Yu-Ren Shen

Journal of Marine Science and Technology–Taiwan

This study proposes an extension neural network (ENN) algorithm to carry out the fault diagnosis of an inverter in a motor drive system for marine vessels. First, we use PSIM software to construct a three-level neutral point clamped (NPC) inverter, which simulates the occurrence of the fault of any power transistor in the NPC inverter. Simultaneously, we use fast Fourier transforms to transcribe the waveform of phase voltage in the time domain during the fault of any power transistor entering the spectrum in the frequency domain, looking for the corresponding characteristic spectrum during the fault of the power transistor. Next, …

Behaviour Of A Spd Switchable Glazing In An Outdoor Test Cell With Heat Removal Under Varying Weather Conditions, Aritra Ghosh, Brian Norton, Aidan Duffy

Articles

Suspended particle device (SPD) switchable glazing has potential to control transmission of solar radiation in the visible range by changing its transparency from 55% to 5%. Outdoor test cell characterisation of a SPD switchable glazing offered the dynamic solar heat gain coefficient (SHGC) which varied between 0.05 (when opaque) and 0.38 (when transparent). Reduction of maximum temperature rise of 11% and 15% was possible using SPD “transparent” and “opaque” state compared to same area double-glazing. Insulated test cell with water flow heat exchanger was employed to measure the cooling load reduction potential of SPD glazing while its transmission changed from …

Dynamic Economic Relations Among Steel Price Indices, Ming-Tao Chou

Journal of Marine Science and Technology–Taiwan

Bulk shipping is now a globalized industry, with market prices entirely dependent on the world’s economic climate. For the bulk shipping market, the steel price index is a crucial standard of reference. In a global industry, the ability to understand the international relationship between changes in information and their effects on economics can help to reduce losses caused by the uncertainty of risk. Because the types of ships and contracts used in bulk shipping are wide-ranging, market participants tend to have difficulty in determining market price changes and trends, and are therefore forced to face greater market uncertainty and volatility. …

Bearing Boundary Element Method Based On Geometrically Similar Roller Conditions, Xia Yang, Ya-Chao Li, Chuang Yan, Guang-Ming Liu, Jian-Mei Wang, Hai-Lian Gui

Journal of Marine Science and Technology–Taiwan

To solve the three-dimensional pressure and load distribution of roller bearings, a new boundary element method (BEM) is presented in this report. First, a discrete model of the initial location roller was established, and the other rollers’ discrete data could be obtained using geometrically similar conditions of this model. Based on the three-dimensional elastic contact BEM, all of the bearing rollers could be described as one object; therefore, the roller bearing problem of a multi-object contact system could be simplified as the problem of a threeobject contact system. Bearing boundary elements were used to realize the discontinuous traction on the …

Analysis Of Wave Interaction With Double Vertical Slotted Walls Using Mbem, Ching-Yun Yueh, Chih-Hao Su, Chun-Chiang Wen, Shih-Hsuan Chuang

Journal of Marine Science and Technology–Taiwan

In this paper, a multi-domain boundary element method (MBEM) is formulated and applied to study wave interaction with double vertical slotted walls, which are modeled as thin or non-thickness structures. Two-dimensional motion with wave crests parallel to the vertical slotted walls and linearized irrotational flow are assumed. The accuracy of the solution obtained using the numerical technique is demonstrated by comparing the numerical values with those obtained from experiments and from other analytical solutions. A comparison of the hydrodynamic performance of the breakwater with identical or different double vertical slotted walls is conducted. In addition, the numerical results of the …

Ultra-Large Grain Pure Copper Microstructure Under Low Cycle Fatigue, Hsing-Lu Huang, Shih-Wei Mao, Tz-Li Hu, Dershin Gan, New-Jin Ho

Journal of Marine Science and Technology–Taiwan

The dislocation structure evolution in polycrystalline copper at constant strain amplitude during low cycle fatigue is well understood. Single crystal, ultra-large grain polycrystalline copper dislocation development has received little attention. Ultra-grain polycrystalline copper with 600 m average grain size was used in this study to investigate the dislocation development at different fatigue strain amplitudes. The results show that; (1) the stress curve vs. number of cycles (S-N curve) produces hardening in the first stage followed by softening regardless of the strain amplitude. At the same time, no plateau is found in the S-N curves. (2) The fatigue saturation stress increases …

Robust Mixed H2/Passivity Performance Controller Design For Uncertain Drum-Boiler System, Cheung-Chieh Ku

Journal of Marine Science and Technology–Taiwan

This paper discusses a robust control problem of uncertain drum-boiler system subject to H2 and passivity performances. The main aims of H2 control scheme are to minimize output energy and guarantee robust asymptotical stability. Besides, passivity theory is applied to constrain effect of external disturbance on the system. Based on Lyapunov function, some sufficient conditions are derived into Linear Matrix Inequality (LMI) form that can be directly calculated by the convex optimization algorithm. Through solving the derived sufficient conditions, a controller can be established to guarantee robust asymptotical stability and mixed H2/Passivity performance of uncertain drum-boiler system. Based on simulation …

Study Of Factors Influencing Mobile Ticketing Adoption: Status Quo Bias Perspective, Qun Zhao, Chun-Der Chen, Jin-Long Wang, Kuang-Ju Wang

Journal of Marine Science and Technology–Taiwan

The purpose of this study is to employ the status quo bias theory to determine the key factors behind the adoption of mobile ticketing by mobile users. Using a survey of 241 mobile ticketing users, structural equation modelling is applied to analyze the validity and reliability of the results. We find that perceived value, self-efficacy, and system support are the most important predictors of switching to mobile ticketing, with perceived value the dominant effect. Hence, it is important to emphasize the benefits of mobile ticketing to increase the perceived value to potential users. Furthermore, a seamless mobile ticketing system with …

Fuzzy Control Via Imperfect Premise Matching Approach For Discrete Takagi-Sugeno Fuzzy Systems With Multiplicative Noises, Wen-Jer Chang, Che-Pin Kuo, Cheung-Chieh Ku

Journal of Marine Science and Technology–Taiwan

In this paper, a fuzzy controller design problem is considered for the discrete-time stochastic Takagi-Sugeno fuzzy systems. The main purpose of this paper is to provide a less conservative fuzzy controller design method for the discretetime nonlinear stochastic systems, which are modeled by the T-S fuzzy models. Based on the concept of imperfect premise matching, the fuzzy controller is designed without the limitation imposed from sharing the same membership functions of fuzzy model. In other words, the imperfect premise matching technique provides a generalization approach in designing fuzzy controller. Moreover, the flexibility and robustness of proposed fuzzy controller design approach …

A Risk Assessment Model For Buildings Of Reinforced Concrete Containing High Concentrations Of Chloride Ions, Tsai-Lung Weng

Journal of Marine Science and Technology–Taiwan

Risk assessment is crucial to the safety and durability of buildings constructed using concrete with high concentrations of chloride ions. This study adopted grey statistical clustering and multi-phase fuzzy statistics in the development of a risk assessment model for existing reinforced concrete buildings. In the proposed model, evaluative indicators are divided into two categories: strength category included compressive strength and corrosion category included carbonation depth, chloride ion content, and steel corrosion current. Overall, the risk to the building can be divided into three levels (low, medium, and high) based on critical values in risk evaluation strategies, parameter weights, and grey …

Synchronization Of Coupled Neurons Via Robust Feedback, Hector Puebla, Ricardo Aguilar-Lopez, Priti Kumar Roy

Annual Symposium on Biomathematics and Ecology Education and Research

No abstract provided.

A Cellular Automation Which Incorporates Finite Element Method And Meshless Algorithm, Yong Cai, Zeyun Chen, Weifeng Yuan

The 8th International Conference on Physical and Numerical Simulation of Materials Processing

No abstract provided.

Effect Of Preparation Technology On Arc Erosion Resistance Of Mgo/Cu Contact Materials, Xiuhua Guo, Kexing Song, Yanmin Zhang, Xuebin Zhang, Jianxin Gao

The 8th International Conference on Physical and Numerical Simulation of Materials Processing

No abstract provided.

Cement Asphalt Mortar Modelling And Its Influence On High-Speed Train–Bridge System In Presence Of Moderate Earthquakes And Service Loading, Lingkun Chen

The 8th International Conference on Physical and Numerical Simulation of Materials Processing

No abstract provided.

Nondestructive Testing And Structural Health Monitoring Based On Adams And Svm Techniques, Gang Jiang, Yi Ming Deng, Ji Tai Niu

The 8th International Conference on Physical and Numerical Simulation of Materials Processing

No abstract provided.

Thermodynamic Calculation Of The Liquidus Surface Projection Of Multi-Component Aluminum Alloys, Jingrui Zhao, Yong Du, Lijun Zhang, Jixue Zhou, Yuansheng Yang

The 8th International Conference on Physical and Numerical Simulation of Materials Processing

No abstract provided.

A356 Aluminum Alloy, Grain Refining, Modification, Microstructure, Mechanical Properties, Jonghun Yoon

The 8th International Conference on Physical and Numerical Simulation of Materials Processing

No abstract provided.

A Molecular Dynamics Study Of Activated Tungsten Inert Gas Welding Process, Cheng Jin, Hanchen Huang

The 8th International Conference on Physical and Numerical Simulation of Materials Processing

No abstract provided.

Novel Closed-Loop Control Strategy For Inkjet-Based Additive Manufacturing System, Yunong Shi, Chunsheng Ye

The 8th International Conference on Physical and Numerical Simulation of Materials Processing

No abstract provided.

Study On Adsorption For Pb2+ Of Red Mud Sintering-Expanded Haydites, Aoping He, Wenfeng Zhu, Linjiang Wang, Jianmin Zeng, Xiyong Chen

The 8th International Conference on Physical and Numerical Simulation of Materials Processing

No abstract provided.

Effect Of Thickness Of Anode Functional Layer On Electrochemical Performance Of Ni-Ce0.8gd0.2o1.9 Anode-Supported Solid Oxide Fuel Cells, Xueping Guo, Kaiping Peng, Chan Zheng, Wei Li, Wenzhe Chen

The 8th International Conference on Physical and Numerical Simulation of Materials Processing

No abstract provided.

Study On Impact And Friction Properties Of Za45si3cu Alloy, Weihe Shi

The 8th International Conference on Physical and Numerical Simulation of Materials Processing

No abstract provided.

Modelling The Evaporation Of Aluminum In Ti–6al–4v Alloy Melted With Electron Beam And Laser, Xuan Wang, Liang Wang, Liang S. Luo, Yan Q. Su, Xin Z. Li, Rui R. Chen, Jing J. Guo, Heng Z. Fu

The 8th International Conference on Physical and Numerical Simulation of Materials Processing

No abstract provided.

Study On Criterion Of Fabricating Columnar Dendrite Structure Dz466 Superalloy Based On Lmc Process, Xun Sun

The 8th International Conference on Physical and Numerical Simulation of Materials Processing

No abstract provided.

Surface Engineering Of Titanium Alloy To Stimulate The Bone Regeneration, Yubin Meng, Zhenduo Cui, Zhaoyang Li, Xue Li, Jin Zhao, Xubo Yuan, Xianjin Yang

The 8th International Conference on Physical and Numerical Simulation of Materials Processing

No abstract provided.

Research On Aseismic Behavior Of Assemble-Type Composited Wall, Yuanyuan Zhao

The 8th International Conference on Physical and Numerical Simulation of Materials Processing

No abstract provided.