Chang W.-D.,Shu-Te University
Simulation Modelling Practice and Theory | Year: 2013
This paper proposes a novel controller design method based on using artificial bee colony (ABC) algorithms for an unstable nonlinear continuously stirred tank reactor (CSTR) chemical system. Such CSTR process is highly nonlinear and its dynamic is significantly dominated by system parameters. It is a good challenge to access the controller design performance when the controller is applied in the CSTR control system. The commonly used proportional-integral-derivative (PID) controller is taken into account in this study, and tuning three PID control gains is carried out by the artificial bee colony algorithm. With the use of the optimal ABC algorithm, PID controller gains can be derived suitably by means of minimizing the cost function given in advance. Finally, several control operations are provided to confirm the feasibility and effectiveness of the proposed method. We also discuss the influence of algorithm initial conditions on the control performance with many different tests. © 2012 Elsevier B.V. All rights reserved.
Lee S.-H.,Shu-Te University
Expert Systems with Applications | Year: 2010
The university performance assessment has become one of the most important debates for the universities in Taiwan. This study aims at developing an intellectual capital (IC) evaluation model to facilitate the understanding of their contribution to the university performances. A conceptual framework that incorporates IC with the university assessment scheme in Taiwan is proposed to construct the IC components as the central intangible resources of universities that are concentrated on its link to university performance ultimately. Analytic hierarchy process (AHP) is applied to formulate and prioritize the IC measurement indicators for constructing the IC evaluation model as decision guidelines under which the development and productive use of investments in intangible assets can be made. In this paper, a fuzzy approach is integrated with AHP method to make up the vagueness about the degree of importance of decision-makers on judgment. An illustrative example is provided of the proposed model for developing a visualized form of Shu-Te University distinction tree. © 2009 Elsevier Ltd. All rights reserved.
Chang W.-D.,Shu-Te University
Applied Soft Computing Journal | Year: 2015
In this paper, a modified particle swarm optimization (PSO) algorithm is developed for solving multimodal function optimization problems. The difference between the proposed method and the general PSO is to split up the original single population into several subpopulations according to the order of particles. The best particle within each subpopulation is recorded and then applied into the velocity updating formula to replace the original global best particle in the whole population. To update all particles in each subpopulation, the modified velocity formula is utilized. Based on the idea of multiple subpopulations, for the multimodal function optimization the several optima including the global and local solutions may probably be found by these best particles separately. To show the efficiency of the proposed method, two kinds of function optimizations are provided, including a single modal function optimization and a complex multimodal function optimization. Simulation results will demonstrate the convergence behavior of particles by the number of iterations, and the global and local system solutions are solved by these best particles of subpopulations. © 2015 Elsevier B.V. All rights reserved.
Tsai T.-N.,Shu-Te University
Robotics and Computer-Integrated Manufacturing | Year: 2011
This paper presents industrial applications for improving the capability of the fine-pitch stencil printing process (SPP) based on the DMAIC framework and using Taguchi-based methodologies. SPP is widely recognized as the main contributor of soldering defects in a surface mount assembly (SMA). An inadequate volume of solder paste deposition or poor printing quality can cause soldering defects and lead to significant reworking and repairing costs. In practice, both the desired amount of solder paste volume (quantitative index) and printing quality (qualitative index) are preferably used to monitor the SPP for the reduction of soldering defects during the statistical control process (SPC), particularly for a fine-pitch solder paste printing operation. To continuously improve SPP capability, the DMAIC framework is followed and Taguchi-based methodologies are proposed under the considerations of single characteristic performance index (SCPI) and multiple characteristic performance indices (MCPI). The SCPI is optimized using the conventional Taguchi method. Then, a Taguchi fuzzy-based model is developed to optimize the SPP with the MCPI property. Optimizing a multi-response problem by the Taguchi method involves the engineers judgment which tends to increase the degree of uncertainty. The performance of these two approaches is compared through the process capability metric, and the material and factors significantly affecting the fine-pitch SPP performance are reported. © 2011 Elsevier Ltd.
Dye C.-Y.,Shu-Te University
Swarm and Evolutionary Computation | Year: 2012
In this paper, we consider a deterministic economic order quantity model with generalized type demand, deterioration and unit purchase cost functions under two levels of trade credit policy. Our objective is to find the optimal values of selling prices, replenishment number and replenishment scheme which maximize the total profit over the finite planning horizon. We establish the inventory system and provide structural properties of the optimal solution that facilitate computation. A particle swarm optimization with constriction factor is coded and used to solve the mixed-integer nonlinear programming problem by employing the properties derived from this paper. At the end, some numerical examples are used to illustrate the features of the proposed model. © 2012 Elsevier B.V. All rights reserved.
Tsai T.-N.,Shu-Te University
International Journal of Computer Integrated Manufacturing | Year: 2013
Copper (Cu) wire has become an alternative material for wire bonding in many microelectronic applications due to the high appreciation in the price of gold. However, the Cu wire bonding process is relatively new to integrated circuit (IC) assembly and must be appropriately controlled to save on manufacturing costs without encountering reliability problems or losing quality. This study proposes an adaptive diagnosis system for the control and quality assessment of the Cu wire bonding process using grey relational analysis (GRA) and a neurofuzzy technique. A fractional factorial experimental design is first utilised to collect structured data, and the results are analysed through an integrated GRA and entropy measurement method to convert the multiple quality characteristics of Cu wire bonding into a synthetic performance index. Next, the neurofuzzy data-learning technique is used to establish the essential knowledge bases. The in-process-quality-control (IPQC) data are then clustered and utilised to fine-tune the membership functions and adjust the weights of fuzzy rules through neurofuzzy data-learning. Finally, customised programming codes are generated for fuzzy rule retrieval and for a graphical user interface design to link users and the process diagnostic and quality assessment knowledge bases. The proposed diagnosis system is evaluated using real-world production data collected from an electronics manufacturing service (EMS) provider of IC packaging to verify its prediction accuracy and applicability. © 2013 Taylor & Francis Group, LLC.
Shu-Te University | Date: 2012-12-27
A bicycle pedal with a locking function has a base and a securing member. The base is positioned on a side of the bicycle and has a U-shaped main body and a through hole disposed on the main body. The securing member has a securing rod with an end attached to the bicycle and disposed through the through hole, and a stopping portion disposed at another end of the securing rod. wherein the main body is capable of sliding along the securing rod between a locking position and a non-locking position, and when the main body is at the locking position, the main body moves to one end of the securing rod and pushes against the stopping portion to prevent wheels from rotating, and when the main body is at the non-locking position, the main body moves to another end of the securing rod to release the wheels.
Shu-Te University | Date: 2011-12-27
The present invention provides an eye drop container with an alignment component, including a body, a spout, and a reflective surface. The body has a top surface. The spout has a bottom integrated with the top surface and an opening opposite to the bottom. The reflective surface is disposed on the top surface of the body and has a central hole, wherein the bottom of the spout is disposed in the central hole.
Shu-Te University | Date: 2013-06-24
An air-conditioning system integrated with an application program (APP) of a smart portable device comprises at least an air-conditioning controller, an APP and a plurality of air-conditioning devices. The air-conditioning controller comprises a temperature sensor, provided for sensing an environment temperature so as to transmit a temperature signal. The APP is installed on a smart portable device such that the APP can transmit an operation signal to the air-conditioning controller according to the temperature signal via the smart portable device. The air-conditioning controller further transmits a control signal to the plurality of air-conditioning devices such that the air-conditioning devices can be operated according to the control signal.
Shu-Te University | Date: 2013-08-05
A multifunction socket device is connected to a main AC power and comprises a frame unit, at least one power outlet, a cover unit and a first illuminating unit. The multifunction socket device can provide power source and illumination device, which bring more convenience and options to modern lifestyle.