National Kaohsiung Marine University

www.nkmu.edu.tw
Kaohsiung, Taiwan

National Kaohsiung Marine University is a university in Nanzih District, Kaohsiung, Taiwan. The current total number of students is 8,000. Wikipedia.


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Kuo C.-L.,National Kaohsiung Marine University
Computers and Mathematics with Applications | Year: 2011

This investigation presents a fuzzy sliding-mode technology for synchronizing two chaotic systems. A method of designing a fuzzy sliding-mode control (FSMC) is presented, which utilizes a variable normalization factor. FSMC is designed to guarantee the global asymptotic synchronization of state trajectories of two different chaotic systems. The chaotic systems are numerically simulated to demonstrate the validity and feasibility of the proposed control structure. © 2010 Elsevier Ltd. All rights reserved.


Yang Y.-C.,National Kaohsiung Marine University
Safety Science | Year: 2011

This paper attempts to evaluate the impact of risk factors from the container security initiative (CSI) on the maritime supply chain in Taiwan, employs a loss exposure matrix to identify the severity and frequency of security risk, and uses a bowtie diagram to investigate appropriate risk management strategies to deal with maritime security risks.This paper's findings consist of the following: (1) the leading categories of CSI risk factors are operational risk, physical risk and financial risk; (2) apart from two security risks comprising high-risk level, the majority of risk exposure is at the medium level; risk management strategies include loss prevention, loss reduction, avoidance, and non-insurance transfer; and (3) all maritime security regulations and measures should consider the balance among cost, time, security, efficiency and competition; failure to do so may lead to additional burdens for maritime supply chain service providers. © 2010 Elsevier Ltd.


Su C.-L.,National Kaohsiung Marine University
IEEE Transactions on Power Systems | Year: 2010

Distributed generation (DG) connected to distribution networks affects the currents or power flows in the networks; thus, node voltages that are strongly related to power flows also are changed. As the voltage must be within permitted limits to comply with utility and customer requirements, this effect should be assessed prior to DG connection. At the distribution level there are a number of attributes that can influence the voltage profiles; therefore, this assessment requires detailed distribution operation models. To provide reliable voltage evaluation results, a new probabilistic methodology is proposed in this paper. The distribution system operation uncertainties including daily time varying load, stochastic DG power production, network configuration, and voltage control devices operation are all taken into account. A probabilistic load flow method based on an efficient algorithm is used to handle uncertainties in loads and DG output power and voltage control devices operation. Accordingly, a probabilistic network reconfiguration model is employed to take stochastic network configurations for service restoration or load balancing into consideration. The proposed probabilistic method provides a better knowledge of the voltage effects and can be used for evaluating the level of DG that might be accepted on a distribution network. The models developed can also be used for assessing impact of voltage mitigation equipment on distribution operating performance. Test results of a modified IEEE feeder test system demonstrate the performance of the proposed method. © 2010 IEEE.


Bu I.Y.Y.,National Kaohsiung Marine University
Journal of Alloys and Compounds | Year: 2011

Zinc oxide (ZnO) is a wide band-gap material with excellent optoelectronic properties. However, the application of ZnO to optoelectronic devices using ZnO has been hindered by the difficulty in obtaining a stable p-type doping. The paper demonstrates that, with a proper selection of the nitrogen precursor, a solution processable, highly c-axis oriented, stable, and p-type aluminium co-doped ZnO (NZO) formation can be obtained. In this study, the NZO films were characterized by using EDS, Raman spectroscopy, photoluminescence, and electrical measurements, respectively. The films were then synthesized through a sol-gel process that was below 600 °C. For the comparative study, NZO films without the Al co-doping were also prepared by sputter. It is observed and shown that, with the formation of nitrous oxide, the basic deposition condition will be more beneficial towards the formation of p-type ZnO. © 2010 Elsevier B.V. All rights reserved.


Hwang Y.-H.,National Kaohsiung Marine University
Numerical Heat Transfer, Part B: Fundamentals | Year: 2011

An accurate moving particle method for incompressible flow calculations is presented in this article. The major distinctive feature in this proposition is the insertion of a pressure mesh within the particle cloud to handle the continuity constraint. It is motivated by the thought that pressure should be a field variable rather than a material one moving with fluid flow. Both the diffusion and convection operators are executed on the particle locations, while the projection operator to retain a convergence-free velocity field is manipulated on the inserted pressure mesh. It will yield a diagonally dominant and constant-coefficient matrix equation to update the pressure field. Besides the advantages gained to enforce the continuity constraint, the auxiliary mesh can significantly enhance the particle searching efficiency in the particle smoothing process. Numerical verifications on some benchmark problems indicate that the present proposition will provide accurate results for incompressible flow calculations. Copyright © Taylor & Francis Group, LLC.


Chen C.-W.,National Kaohsiung Marine University
Applied Soft Computing Journal | Year: 2011

In this study a neural-network (NN) based approach is developed which combines H∞ control performance with Tagagi-Sugeno (T-S) fuzzy control for the purpose of stabilization and stability analysis of nonlinear systems. A Takagi-Sugeno (T-S) fuzzy model and parallel-distributed compensation (PDC) scheme are first employed to design a nonlinear fuzzy controller for the stabilization of nonlinear systems. The neural-network model is adopted to overcome the modeling error problems found with nonlinear systems. A novel stability condition based on an NN-based controller design is derived to ensure the stability of the nonlinear system. The control problem can now be reformulated as a linear matrix inequality (LMI) problem. A simulation is provided in order to explore the feasibility of the proposed fuzzy controller design method. © 2010 Elsevier B.V. All rights reserved.


Lai C.-N.,National Kaohsiung Marine University
IEEE Transactions on Parallel and Distributed Systems | Year: 2012

Routing functions had been shown effective in constructing node-disjoint paths in hypercube-like networks. In this paper, by the aid of routing functions, m node-disjoint shortest paths from one source node to other m (not necessarily distinct) destination nodes are constructed in an n-dimensional hypercube, provided the existence of such node-disjoint shortest paths which can be verified in O(mn 1.5) time, where {m} ≤ {n}. The construction procedure has worst case time complexity O(mn), which is optimal and hence improves previous results. By taking advantages of the construction procedure, m node-disjoint paths from one source node to other m (not necessarily distinct) destination nodes in an n-dimensional hypercube such that their total length is minimized can be constructed in O(mn 1.5 + m 3n) time, which is more efficient than the previous result of O(m 2n 2.5 + mn 3) time. Besides, their maximal length is also minimized in the worst case. © 1990-2012 IEEE.


Nanostructured three-dimensional heterojunctional photovoltaic devices were synthesized through combination of hydrothermal synthesis of zinc oxide nanowires (ZnO NWs) and sol-gel derived cupric oxide. The ZnO NWs were prepared by the hydrothermal method at 90° C, whereas the CuO thin films were synthesized by the sol-gel method. The derived CuO thin films were thoroughly characterized through scanning electron microscopy, X-ray diffraction, energy dispersive spectroscopy, UV-vis spectroscopy and electrical measurement. It was found that power conversion efficiency ∼0.3% can be obtained through the proposed combination. © 2013 Elsevier Ltd and Techna Group S.r.l.


Bu I.Y.Y.,National Kaohsiung Marine University
Ceramics International | Year: 2013

In this paper, polycrystalline zinc oxide (ZnO) nanostructures have been prepared by a hydrothermal synthesis through rapid microwave heating (180 s). The structure, composition and optical properties of the products were examined by scanning electron microscopy (SEM), energy dispersive x-ray spectrum (EDS), ultraviolet-visible spectroscopy (UV-vis), x-ray diffraction (XRD), photoluminescence spectroscopy (PL) and Raman spectroscopy. Typically, the synthesized nanostructures were zinc-rich with diameter ranging from 20 nm to 200 nm in length. From the Raman spectroscopy and PL measurements, it was found that the as-deposited films contain vacancy defects that originated from the rapid synthesis process. © 2012 Elsevier Ltd and Techna Group S.r.l.


Chen C.-W.,National Kaohsiung Marine University
Neural Computing and Applications | Year: 2011

In this study, we present a Takagi-Sugeno (T-S) fuzzy model for the modeling and stability analysis of oceanic structures. We design a nonlinear fuzzy controller based on a parallel distributed compensation (PDC) scheme and reformulate the controller design problem as a linear matrix inequalities (LMI) problem as derived from the fuzzy Lyapunov theory. The robustness design technique is adopted so as to overcome the modeling errors for nonlinear time-delay systems subject to external oceanic waves. The vibration of the oceanic structure, i.e., the mechanical motion caused by the force of the waves, is discussed analytically based on fuzzy logic theory and a mathematical framework. The end result is decay in the amplitude of the surge motion affecting the time-delay tension leg platform (TLP) system. The feedback gain of the fuzzy controller needed to stabilize the TLP system can be found using the Matlab LMI toolbox. This proposed method of fuzzy control is applicable to practical TLP systems. The simulation results show that not only can the proposed method stabilize the systems but that the controller design is also simplified. The effects of the amplitude damping of the surge motion on the structural response are obvious and work as expected due to the control force. © 2011 Springer-Verlag London Limited.

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