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Full-Text Articles in Engineering

Design And Implementation Of Dstatcom For Fast Load Compensation Of Unbalanced Loads, Wei-Neng Chang, Kuan-Dih Yeh Dec 2009

Design And Implementation Of Dstatcom For Fast Load Compensation Of Unbalanced Loads, Wei-Neng Chang, Kuan-Dih Yeh

Journal of Marine Science and Technology

This paper proposes a distribution level static synchronous compensator (DSTATCOM) for fast load compensation of unbalanced loads in electric power distribution systems. For fast response requirement, a new feedforward compensation scheme is derived and employed in the paper. First, the compensation scheme of the DSTATCOM is derived with the symmetrical components method. Then, computer simulation with the program Matlab/Simulink preliminarily verifies the effectiveness of the proposed DSTATCOM. Accordingly, a hardware prototype is built with a floating-point DSP TMS320C6711-based system. Use of a current-regulated PWM (CRPWM) inverter as the power stage of the DSTATCOM generates needed compensation currents for real-time load …


Robust Stability Bounds For Lur'e System With Parametric Uncertainty, Chyun-Chau Fuh, Pi-Cheng Tung Dec 2009

Robust Stability Bounds For Lur'e System With Parametric Uncertainty, Chyun-Chau Fuh, Pi-Cheng Tung

Journal of Marine Science and Technology

The robust stability of Lur’e system with parametric uncertainty is studied through the Popov-Lyapunov approach. Robust stability bounds of such a system are presented. Since we avoid using norm forms and absolute values, the obtained stability bounds are less conservative. An example demonstrating the feasibility of our method is illustrated


Non-Darcy Flow And Heat Transfer In A Porous Insulation With Infiltration, Hwa-Chong Tien, Kwang-Sheng Chiang Dec 2009

Non-Darcy Flow And Heat Transfer In A Porous Insulation With Infiltration, Hwa-Chong Tien, Kwang-Sheng Chiang

Journal of Marine Science and Technology

This work analyzes non-Darcy flow and heat transfer in a vertical slot filled with a porous matrix. The left and right vertical boundaries of the porous system are maintained at higher and lower temperatures, respectively. The horizontal boundaries are assumed to be impermeable and insulated. The vertical boundaries are either completely impermeable, where free convection is induced, or partially permeable in a way to simulate the wall leakage in the building materials, where both air infiltration and free convection exist. The non-Darcy model, which includes the Brinkman and Forchheimer extensions along with the convection terms, is employed to describe the …


Design Of A Fuzzy Gain Scheduling Controller Having Input Saturation: A Comparative Study, Yan-Wen Huang, Pi-Cheng Tung Dec 2009

Design Of A Fuzzy Gain Scheduling Controller Having Input Saturation: A Comparative Study, Yan-Wen Huang, Pi-Cheng Tung

Journal of Marine Science and Technology

A fuzzy gain scheduling proportional controllers that exhibits the improved performance than the conventional linear fixed gain controller having input saturation is proposed in this paper. We proposed an adaptive anti-windup control system in which the gain of a proportional controller is dynamically tuned by a fuzzy PD system. The methodology employed in the analysis is based on the describing function (DF), which is determined the range of the universal discourse for the output of the fuzzy PD system. Other approaches are the linear quadratic regulator (LQR) method and combined back-calculation and generalized conditioning anti-windup. In this paper, a comparison …


The Construction Common Product Coding System And Auto Id Technology In Construction, Nai-Hsin Pan Dec 2009

The Construction Common Product Coding System And Auto Id Technology In Construction, Nai-Hsin Pan

Journal of Marine Science and Technology

Automatic data identification (Auto ID) technology such as bar code has grown rapidly in various industries. During the last couple of years, a small number of construction companies have also started to implement Auto ID technologies for a limited number of applications. The focus of these applications has primarily been limited to the internal operations of a few larger companies. One of the major barriers to adopt modern Auto ID technologies in the construction industry is the lack of Construction Common Product Code System (CCPCS). The main objective of this research is to investigate the problems created by inadequate CCPCS …


A Novel Stability Condition And Its Application To Ga-Based Fuzzy Control For Nonlinear Systems With Uncertainty, Po-Chen Chen, Cheng-Wu Chen, Wei-Ling Chiang, Ken Yeh Dec 2009

A Novel Stability Condition And Its Application To Ga-Based Fuzzy Control For Nonlinear Systems With Uncertainty, Po-Chen Chen, Cheng-Wu Chen, Wei-Ling Chiang, Ken Yeh

Journal of Marine Science and Technology

In this study, we strive to combine the advantages of fuzzy logic control (FLC), genetic algorithms (GA), H∞ tracking control schemes, smooth control and adaptive laws to design an adaptive fuzzy sliding model controller for the rapid and efficient stabilization of complex and nonlinear systems. First, we utilize a reference model and a fuzzy model (both involving FLC rules) to describe and well-approximate an uncertain, nonlinear plant. The FLC rules and the consequent parameter are decided on via GA. A boundary-layer function is introduced into these updated laws to cover modeling errors and to guarantee that the state errors converge …


Service Life Prediction Of Pier For The Existing Reinforced Concete Bridges In Chloride-Laden Environment, Ming-Te Liang, Ran Huang, Shen-An Feng, Chi-Jang Yeh Dec 2009

Service Life Prediction Of Pier For The Existing Reinforced Concete Bridges In Chloride-Laden Environment, Ming-Te Liang, Ran Huang, Shen-An Feng, Chi-Jang Yeh

Journal of Marine Science and Technology

The prediction method of service life for bridge structures is played an important role of bridge management system. In this paper, the mathematical modeling was to study the servise life prediction of pier for existing reinforced concrete (RC) bridge exposed to chloride environment. The corrosion process has three stages, the initiation time (tc), the depassivation time (tp), and the corrosion (propagation) time (tcorr). The total service life of pier for the existing RC bridge can be expressed as t = tc + tp + tcorr. Many mathematical models were applied to predicting each value of the tc, tp, and tcorr. …


Dsp-Based Implementation Of A Real-Time Doa Estimator For Underwater Acoustic Sources, Sheng-Yun Hou, Shun-Hsyung Chang, Hsien-Sen Hung, Jiang-Yao Chen Dec 2009

Dsp-Based Implementation Of A Real-Time Doa Estimator For Underwater Acoustic Sources, Sheng-Yun Hou, Shun-Hsyung Chang, Hsien-Sen Hung, Jiang-Yao Chen

Journal of Marine Science and Technology

Many direction-of-arrival (DOA) estimation algorithms for acoustic sources based on sensor array measurements have been well developed and verified via computer simulations and/or small-scale water trough experiments. However, these results are not in practical use because the testing scenarios may not reflect real underwater environments. In order to have a better understanding of DOA estimation in sea experiments, a prototype of DSP-based acoustic DOA estimator is designed and implemented. The prototype system is based on TMS320VC33 digital signal processor and is validated by both computer simulation and experiments performed on the shallow water of Bi-Sha fishery harbor located near the …


Cpt-Based Simplified Liquefaction Assessment By Using Fuzzy-Neural Network, Shuh-Gi Chern, Ching-Yinn Lee Dec 2009

Cpt-Based Simplified Liquefaction Assessment By Using Fuzzy-Neural Network, Shuh-Gi Chern, Ching-Yinn Lee

Journal of Marine Science and Technology

Due to the difficulty and the cost of obtaining high quality undisturbed samples, simplified methods based on in-situ tests such as the standard penetration test (SPT) and the cone penetration test (CPT) are preferred by geotechnical engineers for evaluation of earthquake induced liquefaction potential of soils. Because of the increasing popularity worldwide of the CPT for site characterization, significant progress on the CPTbased methods has been made. In most existing CPT-based methods, empirically determined curves are used to predict liquefaction and non-liquefaction. These empirical curves are generally relied on engineering judgment and are essentially performance functions that were established based …


Fundamental Properties Of Linear Ship Steering Dynamic Models, Ching-Yaw Tzeng, Ju-Fen Chen Dec 2009

Fundamental Properties Of Linear Ship Steering Dynamic Models, Ching-Yaw Tzeng, Ju-Fen Chen

Journal of Marine Science and Technology

This paper is concerned with the fundamental properties associated with the Nomoto models. Specifically, the state space model associated with the first order Nomoto model is both observable and controllable. The state space model associated with the second order Nomoto model is also observable; however, it is controllable only if the effective sway time constant is different from the effective yaw time constant. The zero appearing in the transfer function model is found responsible for the overshoot behaviors, which are typical in the yaw rate for large rudder angle steering. This suggests that a second order Nomoto model is more …


Degradation Of The Bond Strength Between Rebar And Concrete Due To The Impressed Cathodic Current, Jiang-Jhy Chang, Weichung Yeih, Ran Huang Dec 2009

Degradation Of The Bond Strength Between Rebar And Concrete Due To The Impressed Cathodic Current, Jiang-Jhy Chang, Weichung Yeih, Ran Huang

Journal of Marine Science and Technology

In this study, the degradation of the bond strength between the steel rebar and concrete by the impressed cathodic current was investigated. Experimental results showed that the bond strength degraded as the charging current density and the polarization time increased basically. A new parameter representing the total transferred electrons per unit protected area was proposed, and the bond strength was found to decrease as the parameter increased after some value.


A Representation Of Gm-Variation In Waves By The Volterra System, Jianbo Hua, Wei-Hui Wang, Jiang-Ren Chang Dec 2009

A Representation Of Gm-Variation In Waves By The Volterra System, Jianbo Hua, Wei-Hui Wang, Jiang-Ren Chang

Journal of Marine Science and Technology

As known, the variation of the metacentric height of a ship in irregular waves is not a pure linear process, particular when a ship has large beam to draught ratio and large flare near the waterline at bow and stern. This kind of unconventional hull form is usually adopted for modern RoRo-ship, cruise-ship etc. which allows large cargo space and high service speed. In this paper, the GM-variation is derived into a function series with respect to the variation order and represented by the Volterra system. The transfer functions for the different orders are integrated numerically or analytically through expressing …


Spanning Trees For Binary Directed De Bruijn Networks And Their Applications To Load Balancing, Ming-Bo Lin, Ming-Hong Bai, Gene Eu Jan Dec 2009

Spanning Trees For Binary Directed De Bruijn Networks And Their Applications To Load Balancing, Ming-Bo Lin, Ming-Hong Bai, Gene Eu Jan

Journal of Marine Science and Technology

One of the major reasons of using parallel computer systems is that they have the potential for improving performance and resource sharing. To achieve this, an efficient way must be provided to broadcast a message or messages from a node to every other nodes in the system. However, the efficiency of transferring messages in a system is determined by the architecture of the underlying interconnection network of the system. In this paper, we consider the systems based on binary directed de Bruijn networks and define two shortest path spanning trees: the upward-0 spanning tree and the downward-0 spanning tree, to …


Boundary Particle Method For Inverse Cauchy Problems Of Inhomogeneous Helmholtz Equations, Wen Chen, Zhuojia Fu Sep 2009

Boundary Particle Method For Inverse Cauchy Problems Of Inhomogeneous Helmholtz Equations, Wen Chen, Zhuojia Fu

Journal of Marine Science and Technology

This paper investigates the boundary particle method (BPM) coupled with truncated singular value decomposition (TSVD) regularization technique on the solution of inverse Cauchy problems of inhomogeneous Helmholtz equations. Unlike the other boundary discretization methods, the BPM does not require any inner nodes to evaluate the particular solution, since the method uses the recursive composite multiple reciprocity technique to reduce an inhomogeneous problem to a series of higher-order homogeneous problems. The BPM is particular attractive to solve inverse problems thanks to its truly boundary-only meshless merit. In this study, numerical experiments demonstrate that the BPM in conjunction with the TSVD is …


Simulation Of Cnt Composites Using Fast Multipole Bem, Zhen-Han Yao, Jun-Dong Xu, Hai-Tao Wang, Xiao-Ping Zheng Sep 2009

Simulation Of Cnt Composites Using Fast Multipole Bem, Zhen-Han Yao, Jun-Dong Xu, Hai-Tao Wang, Xiao-Ping Zheng

Journal of Marine Science and Technology

This paper addresses some applications of the fast multipole boundary element method on the simulation of CNT composites, including the simulation of elastic, thermal and electric properties. The carbon nanotubes are treated as effective elastic fibers for the simulation of elastic property, and treated as straight fibers with high thermal conductivity and high electric conductivity for the simulation of thermal and electric properties respectively. The numerical examples are compared with other numerical results and experimental data published in literature. To reduce the difference between numerical and experimental value of effective elastic modulus, two approaches with nonideal interfacial condition or additional …


Novel Methods For Solving Severely Ill-Posed Linear Equations System, Chein-Shan Liu, Chih-Wen Chang Sep 2009

Novel Methods For Solving Severely Ill-Posed Linear Equations System, Chein-Shan Liu, Chih-Wen Chang

Journal of Marine Science and Technology

We treat an ill-posed system of linear equations by transforming it into a linear system of stiff ordinary differential equations (SODEs), adding a differential term on the left-hand side. In order to overcome the difficulty of numerical instability when integrating the SODEs, Liu [20] has combined nonstandard finite difference method and group-preserving scheme, namely the nonstandard group-preserving scheme (NGPS), to obtain an unconditional stable numerical method for SODEs. This paper applies the NGPS to the SODEs resulting from the ill-posed linear equations, and proves that the new algorithms are unconditional stable. To strengthen accuracy, an L-curve is used to select …


A Mathematical Revision Of The Landau-Lifshitz Equation, Chein-Shan Liu, Kuo-Ching Chen, Chau-Shioung Yeh Sep 2009

A Mathematical Revision Of The Landau-Lifshitz Equation, Chein-Shan Liu, Kuo-Ching Chen, Chau-Shioung Yeh

Journal of Marine Science and Technology

For the Landau-Lifshitz equation a Lie type linear system representation in the Minkowski space M3 1+ has been derived previously [25]. The internal symmetry group is a proper orthochronous Lorentz group SOo(3, 1), and the numerical method based on the internal symmetry was developed in [29]. This paper derives another four new representations of the Landau-Lifshitz equation. We prove that this equation admits two generators: one conservative and one dissipative, as well as two brackets: Poisson bracket and dissipative bracket. Upon embedding the Landau-Lifshitz equation into a skew-symmetric matrix space, we can develop a double-bracket flow representation. The conserved magnetization …


A Modified Newton Method For Solving Non-Linear Algebraic Equations, Satya N. Atluri, Chein-Shan Liu, Chung-Lun Kuo Sep 2009

A Modified Newton Method For Solving Non-Linear Algebraic Equations, Satya N. Atluri, Chein-Shan Liu, Chung-Lun Kuo

Journal of Marine Science and Technology

The Newton algorithm based on the “continuation” method may be written as being governed by the equation xj(t) + Bij-1 Fi(xj) = 0, where Fi(xj) = 0, i, j = 1, …n are nonlinear algebraic equations (NAEs) to be solved, and Bij = ∂Fi /∂xj is the corresponding Jacobian matrix. It is known that the Newton's algorithm is quadratically convergent; however, it has some drawbacks, such as being sensitive to the initial guess of solution, and being expensive in the computation of the inverse of Bij at each iterative step. How to preserve the convergence speed, and to remove the …


Method Of Fundamental Solutions With External Source For The Eigenfrequencies Of Waveguides, Chia-Ming Fan, Der-Liang Young, Chia-Lin Chiu Sep 2009

Method Of Fundamental Solutions With External Source For The Eigenfrequencies Of Waveguides, Chia-Ming Fan, Der-Liang Young, Chia-Lin Chiu

Journal of Marine Science and Technology

This study adopts a meshless numerical method, the combination of the method of fundamental solutions (MFS) and method of particular solutions (MPS) following the lead of Reutskiy, to determine the eigenfrequencies of four different waveguides, based on the principle of physical response of a system exposed to external source. The response amplitudes to determine the resonant frequencies for the eigenproblems are used. We use the MFS with external source (MFS-ES) and MPS to solve a sequence of inhomogeneous problems for the determination of the eigenfrequencies. This is an alternative to the typical methods of directly solving the homogeneous matrix system …


Antifouling Properties Of Conductive Rubber Coatings Used For Fishing Nets, Jer-Ruey Huang, Wei-Ting Lin, Ran Huang, Jiann-Kuo Wu Sep 2009

Antifouling Properties Of Conductive Rubber Coatings Used For Fishing Nets, Jer-Ruey Huang, Wei-Ting Lin, Ran Huang, Jiann-Kuo Wu

Journal of Marine Science and Technology

The purpose of the present study is to develop a new conductive coating for application on fishing nets that can be used as an anode, while submersed in the sea, to generate free chlorine which will in turn inhibit marine biofouling. To confirm the durability and viability of this coating, long-term field tests were carried out in the Nanao harbor in Taiwan. Electrical resistivity tests showed that conductive rubber with a polyaniline coating demonstrates the lowest resistivity: 0.11 Ωm. This sample also generated optimal quantities of free chlorine, which demonstrates antifouling properties. The use of carbon black in conjunction with …


A Complete Stability Theory For The Kirchhoff Thin Plate Under All Kinds Of Actions, Shyh-Rong Kuo, Chih-Chang Chi, Yeong-Bin Yang Sep 2009

A Complete Stability Theory For The Kirchhoff Thin Plate Under All Kinds Of Actions, Shyh-Rong Kuo, Chih-Chang Chi, Yeong-Bin Yang

Journal of Marine Science and Technology

A complete stability theory for a plate can be constructed by an incremental virtual work equation describing instability effects induced by all kinds of actions. Besides, this incremental virtual work equation should satisfy the rigid body rule, i.e., it should objectively obey the rigid body rule no matter what coordinates systems are adopted. In this paper, a complete nonlinear stability theory for the Kirchhoff thin plate is proposed by using the principle of virtual work and the update Lagrangian formulation. Then, a rigid body motion testing method is developed for examining the incremental virtual work equation. In developing such a …


Computer Assisted Proof Of Spurious Eigensolution For Annular And Eccentric Membranes, I-Lin Chen, Jeng-Tzong Chen, Wei-Ming Lee, Shang-Kai Kao Sep 2009

Computer Assisted Proof Of Spurious Eigensolution For Annular And Eccentric Membranes, I-Lin Chen, Jeng-Tzong Chen, Wei-Ming Lee, Shang-Kai Kao

Journal of Marine Science and Technology

Spurious eigensolutions in the boundary integral equation (BIE) or boundary element method (BEM) for doublyconnected domain problems, the eccentric and annular membranes, are studied analytically and numerically in this paper. For the mathematical analysis, we employ the null-field integral equation, the degenerate kernels and the Fourier series to prove the existence of spurious eigensolutions in the continuous system. Examples of eccentric case, annular membrane and general shape are solved by using the null-field equation approach and BEM, respectively. Based on the numerical experiment, computer-assisted proof for the existence of spurious eigenvalues in companion with the trivial outer boundary data is …


Analysis Of Maximum Wind Force For Offshore Structure Design, Jing-Jong Jang, Guo Jyh-Shinn Jun 2009

Analysis Of Maximum Wind Force For Offshore Structure Design, Jing-Jong Jang, Guo Jyh-Shinn

Journal of Marine Science and Technology

This paper presents the results of a study in which a method is developed for estimating maximum turbulent wind drag force acting on a floating offshore structure with low natural frequency. In evaluating the drag force, forces associated with turbulent wind speeds are considered using both the linear and nonlinear reliability analysis approaches. A mathematical wind spectral density formulation is employed. The probability density function applied for the maximum turbulent wind-induced drag force analysis is considered as a random process. The maximum wind force is analytically developed by using an approximate single term expression for the functional relationship between the …


Kalman Filter Effective To Hydrologic Routing?, Yang-Liang Jeng, Rong-Che Chen, Chao-He Chang Jun 2009

Kalman Filter Effective To Hydrologic Routing?, Yang-Liang Jeng, Rong-Che Chen, Chao-He Chang

Journal of Marine Science and Technology

Intake-generated tumbling motion has been recently proposed to enhance the turbulence level during compression stroke to promote the combustion rate and reduce operation variations. This study is to investigate the quality of the tumbling motion, especially for the engine with a bowl-in-piston. To overcome the difficulties on the flow visualization caused by the high-speed motion of a real engine, a transparent water-analogy-simulation system is designed based on similarity analysis and fabricated to model the operation of an actual engine. Benchmark tests including the qualitative flow visualization and quantitative full-field measurements using a high-speed PIA system have been conducted to study …


Behavior Of Chemically Dispersed Oil In Marine Sediment, Jian Hua Jun 2009

Behavior Of Chemically Dispersed Oil In Marine Sediment, Jian Hua

Journal of Marine Science and Technology

This laboratory study was to describe properties of four chemically dispersed oils within natural beach sands. The influence of temperature on the adsorption characteristics of dispersed oil to marine sediment was almost negligible, within 10 to 30°C. With certain amount of oil and varied dispersant/oil ratio, oil in top sediments following flushing was not affected by the increase in dispersant application. The application dosage of dispersant had no more influence on releasing oil to deeper sediment or water than the amount of oil applied. When the outflow rate of flushing water doubled, the amounts of oil retained in surface sediment …


Residual Vibrations Of Electrostatic Micro-Actuators With Novel Shaped Cantilevers, Ming-Hung Hsu Jun 2009

Residual Vibrations Of Electrostatic Micro-Actuators With Novel Shaped Cantilevers, Ming-Hung Hsu

Journal of Marine Science and Technology

This paper subjects electrostatic curved electrode actuators with novel shaped cantilevers to nonlinear dynamic analysis using the differential quadrature method. Numerical results are compared with experimental results to assess the efficiency and systematic procedure of this novel approach for nonlinear differential equations. The pull-in voltages computed for different structures correlate well with published data. Several characteristics of different combinations of shaped cantilevers and curved electrodes are also examined in this paper. Dynamic responses of actuators with novel shapes with several pull-in voltages are determined. The transitional responses for the derived systems are calculated using the Wilson-θ method.


Evaporation Effect In Nonlinear Penetration Of High Energy Beam Drilling, Je-Ee Ho, Chen-Lung Yen Jun 2009

Evaporation Effect In Nonlinear Penetration Of High Energy Beam Drilling, Je-Ee Ho, Chen-Lung Yen

Journal of Marine Science and Technology

Due to the inappropriate assumption with the neglect of evaporation effect in previous research, a linear penetration behavior with a significant deviation from the experimental result was usually proposed in the lower energy density region. To remedy the defect, the evaporation mass determined from the difference between the melting rate and flow expulsion by pressure difference is reconsider in this study. With a 2-D quasic-steady model based on the enthalpy theory, the uniform penetration velocity estimated from the Stefan boundary condition provides a special advantage in calculating efficiency. Meantime, the divergent iteration has been effectively avoided by setting up a …


Inductively/Capacitively Coupled Conductor-Backed Coplanar Waveguide Bandpass Filters Using Slow-Wave Stepped-Impedance Resonators, Jiunn-Jye Chang, Chih-Hong Sie Jun 2009

Inductively/Capacitively Coupled Conductor-Backed Coplanar Waveguide Bandpass Filters Using Slow-Wave Stepped-Impedance Resonators, Jiunn-Jye Chang, Chih-Hong Sie

Journal of Marine Science and Technology

In this paper, using the conductor-backed coplanar waveguides (CBCPWs) and the slow-wave stepped-impedance resonators, a second-order and a fourth-order inductively/capacitively coupled bandpass filters are designed, implemented, and measured. For second-order bandpass filter, two H-shaped defected ground structure (DGS) patterns are etched on the backside metallic ground planes of the input and output feedlines, it is found that two attenuation poles exist on both sides of the passband. When compared to the fourth-order bandpass filter without H-shaped DGS, the second-order bandpass filter with H-shaped DGS has compact size and comparable rolloff at the edges of the passband. In addition, the measured …


Decision Analysis For Construction Contract Risk-Sharing, Teh-Chang Lee, Ta-Hsing Lee, Ching-Hwang Wang Jun 2009

Decision Analysis For Construction Contract Risk-Sharing, Teh-Chang Lee, Ta-Hsing Lee, Ching-Hwang Wang

Journal of Marine Science and Technology

As the risk-sharing provisions in domestic public construction contracts are not completely fair and reasonable, contract disputes often arise as a result which in turn cause delays, quality impacts, and other problems that urgently need improvement. Introduced in this article is the development of a decision system for risk-sharing in public construction contracts. Said system was developed through literature review, questionnaire and interviews of experts, fuzzy synthetic evaluation in conjunction of analytic hierarchy process, definition of risks in public construction contracts, and establishment of decision models for risk-sharing. Subsequently, the “escalation” risk was employed as an example to select suitable …


Labview-Based Fuzzy Controller Design Of A Lighting Control System, Mou-Lin Jin, Ming-Chun Ho Jun 2009

Labview-Based Fuzzy Controller Design Of A Lighting Control System, Mou-Lin Jin, Ming-Chun Ho

Journal of Marine Science and Technology

This paper describes how we design a lighting control system including hardware and software. Hardware includes light sensing circuit, control circuit, and 8255 expanding I/O circuit, PC, and bulb. Sensing circuit uses photo-resistance component to sense the environmental light and then transmit the signal of the lightness to the computer through an 8-bit A/D converter 0804. The control circuit applies reed relay in digital control way to adjust the variable resistor value of the traditional dimmer. Software incorporates LABVIEW graphical programming language and MATLAB Fuzzy Logic Toolbox to design the light fuzzy controller. The rule-base of the fuzzy logic controller …