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Pingtung, Taiwan

National Pingtung University of Education was an institution of higher learning in Pingtung City, Pingtung County, Taiwan. Wikipedia.

Chen C.-Y.,National Pingtung University
JVC/Journal of Vibration and Control | Year: 2012

The most important problem related to internal wave observation is that it is difficult to obtain clear results with in-situ observations. There are many factors, including the topography, time, season, wind and temperature, which may affect the shape of the wave, perhaps even making it disappear or not leave strong evidence. This paper discusses the research on in-situ observations of such waves in oceans, estuaries and lakes. Over the past decades, researchers have observed this phenomenon and have carried out numerical experiments about these internal solitary waves. They have used high tech equipment and mathematical methods to detect and calculate the results of wave vibration and simulate the in-situ conditions seen during wave turbulence. We focus on the in-situ observation of such waves in oceans, estuaries and lakes, surveying scholarly work over the past few years from a wide variety of places including Europe, the United States, South Africa, Taiwan, the South China Sea and the Yellow Sea. Even now, with the rapid development of new technology for use in in-situ observations, there are still many elements of the behavior of such waves that remain to be solved. © 2011 The Author(s) Reprints and permissions. Source

Chen C.-Y.,National Pingtung University
Environmental Fluid Mechanics | Year: 2010

This study aims to develop methods that are capable of deciding the breaking criterion for an internal solitary wave (ISW) propagating over a submarine ridge. Laboratory experiments were conducted in a wave tank to measure ISWs propagating over a submarine ridge. The results suggest that the ISW-ridge interaction can be grouped according to three degrees of magnitude based on the blockage parameter ζand the degree of blocking B. For classification reasons, we first present an alternative decision model for evaluating the interaction of ISWs with an underwater ridge in a two-layer system. This approach is based on a multivariate statistical method and discriminant analysis. Information obtained from the eigenvalues is used to combine different ratio measures which are defined according to every single input and output. The discriminant model effectively classifies units into distinct predefined groups. An experimental simulation is conducted to demonstrate the practical implementation of the ISW-ridge interaction. The results of the method applied in this example are statistically significant, demonstrating the effectiveness of the ISW-ridge interaction classification method. © 2010 Springer Science+Business Media B.V. Source

Wu J.,National Pingtung University
Future Generation Computer Systems | Year: 2016

This paper explores the energy-efficient scheduling of real-time tasks on a non-ideal DVS processor in the presence of resource sharing. We assume that tasks are periodic, preemptive and may access to shared resources. When dynamic-priority and fixed-priority scheduling are considered, we use the earliest deadline first (EDF) algorithm and the rate monotonic (RM) algorithm to schedule the given set of tasks. Based on the stack resource policy (SRP), we propose an approach, called blocking-aware two-speed (BATS) algorithm, to synchronize the tasks with shared resources and to calculate appropriate execution speeds so that the shared resources can be accessed in a mutual exclusive manner and the energy consumption can be reduced. Particularly, BATS uses a static low speed to execute tasks initially, and then it switches to a high speed dynamically whenever a task blocks a higher priority task. More specifically, the processor runs at the high speed from the beginning of the blocking until the deadline of the blocked task or the processor becomes idle. In order to guarantee that the deadlines of tasks are met, the static low speed and the dynamic high speeds are derived based on the theoretical analysis of the schedulability of tasks. Compared with existing work, BATS achieves more energy saving because its dynamic high speeds are lower than that of existing work and the processor has less chance to execute tasks at the high speeds. The schedulability analysis and the properties of our proposed BATS are provided in this paper. We also evaluated the capabilities of BATS by a series of experiments, for which we have some encouraging results. © 2015 Elsevier B.V. Source

Chen C.Y.,National Pingtung University
Applied Soft Computing Journal | Year: 2013

Although there are many successful applications of neural networks (NNs), however, there are still some drawbacks in using neural networks (NNs) in any control scheme. In this study an NN-based model is applied for a tension leg platform (TLP) system. A linear differential inclusion (LDI) state-space representation is constructed to represent the dynamics of the NN model. Control performance is achieved by using the parallel distributed compensation (PDC) scheme to ensure the stability of TLP systems subjected to an external wave force. In terms of the stability analysis, the linear matrix inequality (LMI) conditions are derived using the Lyapunov theory to guarantee the robustness design and stability of the TLP system. A simulation example based on practical data is given to demonstrate the feasibility of the proposed fuzzy control approach. In the end, we discuss a practical application with field data on the wave properties and structural characteristics. The results indicate the efficiency and robustness of the proposed NN based approach. Source

National Pingtung University | Date: 2011-06-17

A method for forming circuit patterns on a surface of a substrate is provided and has steps of: providing and pre-heating a substrate having an insulation surface on one side thereof; providing an activation connection device for oscillating and painting an activation solder onto the pre-heated insulation surface to heat and melt the activation solder; applying ultrasonic waves to the melted activation solder by the activation connection device, so as to activate the activation solder and the insulation surface by the ultrasonic waves; and moving the activation connection device, so as to form a circuit pattern on the insulation surface by the activation solder.

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