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Articles 1 - 22 of 22
Full-Text Articles in Engineering
Functional Model Of Cost And Time For Highway Construction Projects, Jin-Fang Shr, Wei-Tong Chen
Functional Model Of Cost And Time For Highway Construction Projects, Jin-Fang Shr, Wei-Tong Chen
Journal of Marine Science and Technology
It is commonly accepted that construction cost, time and quality performance has been regarded as the major success factors for a construction project. With the increasing use of innovative contracts in highway construction, the relationship between construction cost and time has become more crucial than ever. Improved control of time value has become necessary, for quantifying the functional relationship between construction cost and time. This study explores the functional relationship between highway construction cost and time. Data from projects of the Florida Department of Transportation (FDOT) in the US is utilized to develop and illustrate the quantifying model. The proposed …
A Case Study Of Inter-Arrival Time Distributions Of Container Ships, Tu-Cheng Kuo, Wen-Chih Huang, Sheng-Chieh Wu, Pei-Lun Cheng
A Case Study Of Inter-Arrival Time Distributions Of Container Ships, Tu-Cheng Kuo, Wen-Chih Huang, Sheng-Chieh Wu, Pei-Lun Cheng
Journal of Marine Science and Technology
Given the recent prevalence of periodical container liners, the applicability of related models of widely applied queuing theory is left in doubt. Since they focus on marine liners, the distribution pattern is always considered to be a deterministic distribution for periodical schedule. In order to investigate the distribution patterns of container liners, observation units are segmented into single shipping liners, single berths, single container terminals and entire ports. The evolution of the ship arrival distribution pattern and the goodness-of-fit test for observation are based on the ship dynamic data of international harbors in Taiwan. This study aims to implement tests …
Particle Swarm Optimization For Global Optimization Problems, Hsin-Chuan Kuo, Jiang-Ren Chang, Ching-Hsiang Liu
Particle Swarm Optimization For Global Optimization Problems, Hsin-Chuan Kuo, Jiang-Ren Chang, Ching-Hsiang Liu
Journal of Marine Science and Technology
In this paper, the particle swarm optimization (PSO), originated as a simulation of a simplified social system with swarm intelligence and having exploring and exploiting characteristics of the particle swarm, is adopted to deal with the global optimization problems. To begin with, four non-linear two-dimensional functions are adopted as benchmark examples for determining the suitable ranges of parameters in the PSO. It is found that uses of the PSO can make the search quickly converge to the global optimum. Then, several benchmark functions below ten-dimensions are adopted especially for comparisons of search efficiency on the PSO and other algorithms. Results …
Emergence Of Attached Recirculating Eddy For Flow Around A Circular Cylinder Asymmetrically Placed In A Channel, Tsung-Chan Hsieh, Jiahn-Horng Chen
Emergence Of Attached Recirculating Eddy For Flow Around A Circular Cylinder Asymmetrically Placed In A Channel, Tsung-Chan Hsieh, Jiahn-Horng Chen
Journal of Marine Science and Technology
This study discusses the emergence and development of cylinder-attached recirculating regions appearing in a fully developed flow past a circular cylinder asymmetrically confined between two infinite parallel plates. We employed a finite-volume method with the SIMPLE algorithm to compute the flow fields for various sizes and asymmetrical settings of circular cylinders. Two geometrical parameters, the blockage and asymmetry coefficients, are varied in computations. A series of computations show that the flow evolves a single asymmetrical recirculating region for the Reynolds number beyond some critical value. Its development in length bears a linear relation to the Reynolds number. Its growth rate …
Web Services Of Mms Applications On Mobile Devices, Cheng-Chih Yang, Cheng-Min Lin
Web Services Of Mms Applications On Mobile Devices, Cheng-Chih Yang, Cheng-Min Lin
Journal of Marine Science and Technology
This study develops the Web services that are applied in Multimedia Message Service (MMS) applications via the Internet and operated by mobile portable devices, such as Personal Digital Assistant (PDA) and cellular phone. First, a MMS system environment and architecture is modeled. Next, the operations and interface of the MMS system is defined by the Web Services Description Language (WSDL) to represent the web services on MMS application system. Finally, two system prototypes are described in this study that includes distance video cam monitor system and GPRS cellular phone MMS sender.
Minimizing The Makespan In A Two-Stage Flowshop Scheduling Problem With A Function Constraint On Alternative Machines, Chou-Jung Hsu, Wen-Hung Kuo, Dar-Li Yang, Maw-Sheng Chern
Minimizing The Makespan In A Two-Stage Flowshop Scheduling Problem With A Function Constraint On Alternative Machines, Chou-Jung Hsu, Wen-Hung Kuo, Dar-Li Yang, Maw-Sheng Chern
Journal of Marine Science and Technology
In this paper, we consider a two-stage flowshop scheduling problem with a function constraint on alternative machines. The objective is to minimize the makespan. We show that the proposed problem is NP-hard and provide some heuristic algorithms and computational experiments. In addition, from the experimental results, the modification of Johnson’s rule combined with the First-Fit rule is the best heuristic algorithm of the proposed heuristic algorithms.
Wavelet-Based Shift-Invariant Noise Model, Fu-Tai Wang, Jenny Chih-Yu Lee, Shun-Hsyung Chang
Wavelet-Based Shift-Invariant Noise Model, Fu-Tai Wang, Jenny Chih-Yu Lee, Shun-Hsyung Chang
Journal of Marine Science and Technology
This paper proposes the use of shift-invariant dual-tree discrete wavelet transform (DT DWT) noise model to the problem of a multipath signal detection in underwater environment. The design procedure for this adaptive model of the background noise is described. When an input signal is shifted, as in a multipath environment, this shift-invariant DT DWT can generate multi-resolution subspaces. Each of them keeps more coefficient energy of this signal than DWT’s. The result of computer simulations shows that this method can improve the performance of a multipath signal detection, by reducing the false alarm probability in a range of different signal-tonoise …
Debt Ratio Analysis Of Taiwan??Property Development Firms Under Contraction, Chao-Hui Wu, Ting-Ya Hsieh
Debt Ratio Analysis Of Taiwan??Property Development Firms Under Contraction, Chao-Hui Wu, Ting-Ya Hsieh
Journal of Marine Science and Technology
This study analyzes the correlation between debt ratios and corporate performance of the property development firm during times of contraction in Taiwan. This study collects and examines financial data for the period 1992 to 2003 for 25 listed property development firms. A total of 16 financial ratios, collectively representing corporate performance, were statistically checked with three types of debt ratios. The comparison results reveal that profitability related ratios are inadequate representations of corporate performance. Especially, investors consider a vigorous dividends policy to indicate a crisis. Two positive directions for property development firms during a contraction include (1) product differentiation and …
Dynamic Relationship Of Steel Prices Between Two Different Markets:Taiwan And Mainland China, Yong-Huang Lin, Yun-Wu Wu
Dynamic Relationship Of Steel Prices Between Two Different Markets:Taiwan And Mainland China, Yong-Huang Lin, Yun-Wu Wu
Journal of Marine Science and Technology
Price variation is one of the major factors taken into account in cost control decision in construction projects. Previous researches have focused on the short-term price prediction of a merchandise within a closed single market without considering the long-term effect by interacting with other markets. The econometric methods such as structural break test, co-integration analysis, and Granger causality test were used to examine the dynamic short-term and long-term relationships of steel prices between two different markets, Taiwan and China, over the period of 1995 ~ 2004. The steel price of China was found to have the leading discovery function by …
Averaged Inertia Principle For Non-Newtonian Squeeze Films In Wide Parallel Plates: Couple Stress Fluid, Jaw-Ren Lin, Chi-Ren Hung, Rong-Fang Lu
Averaged Inertia Principle For Non-Newtonian Squeeze Films In Wide Parallel Plates: Couple Stress Fluid, Jaw-Ren Lin, Chi-Ren Hung, Rong-Fang Lu
Journal of Marine Science and Technology
On the basis of the Stokes micro-continuum theory, the combined effects of non-Newtonian couple stresses and convective fluid inertia forces upon the squeeze film characteristics of two wide parallel plates are investigated by using the averaged inertia principle. A numerical solution of the film height versus response time is calculated by using the fourth-order Runge-Kutta method. Compared to the Newtonian-lubricant non-inertia case of Hamrock [4], the qualitative effects of couple stresses and convective inertia forces provide an increase in the film pressure, the load capacity and the response time. Moreover, the quantitative effects are more pronounced for wide parallel plates …
Determining The Repair Ranking Of Existing Rc Bridges Using Least Squares Technique Associated With Comparison Matrix Method, Ming-Te Liang, Chin-Ming Lin, Wen-Hu Tsao, Chi-Jang Yeh
Determining The Repair Ranking Of Existing Rc Bridges Using Least Squares Technique Associated With Comparison Matrix Method, Ming-Te Liang, Chin-Ming Lin, Wen-Hu Tsao, Chi-Jang Yeh
Journal of Marine Science and Technology
The principal objective of this paper is employed the least squares technique associated with comparison matrix method to determine the repair ranking of existing reinforced concrete (RC) bridges with bestridden or non-bestridden river. Six existing RC bridges in Taiwan are given as an illustrative example. For verifying the feasibility and reliability of the proposed method, the D (Degree) E (Extent) R (Relevancy) evaluation method, which is only considered the RC bridges built on river bed and is now widely used to evaluate the damage grade for existing RC bridges in Taiwan, is also adopted to assessing the same six existing …
Determining The Repair Ranking Of Existing Rc Bridges Using Least Squares Technique Associated With Comparison Matrix Method, Ming-Te Liang, Chin-Ming Lin, Wen-Hu Tsao, Chi-Jang Yeh
Determining The Repair Ranking Of Existing Rc Bridges Using Least Squares Technique Associated With Comparison Matrix Method, Ming-Te Liang, Chin-Ming Lin, Wen-Hu Tsao, Chi-Jang Yeh
Journal of Marine Science and Technology
The principal objective of this paper is employed the least squares technique associated with comparison matrix method to determine the repair ranking of existing reinforced concrete (RC) bridges with bestridden or non-bestridden river. Six existing RC bridges in Taiwan are given as an illustrative example. For verifying the feasibility and reliability of the proposed method, the D (Degree) E (Extent) R (Relevancy) evaluation method, which is only considered the RC bridges built on river bed and is now widely used to evaluate the damage grade for existing RC bridges in Taiwan, is also adopted to assessing the same six existing …
Reinforcing Effects And Mechanical Properties Of Rc Beam With Cfs Under Static And Running Loads, Ming-Chien Hsu, Tadashi Abe, Tetsukazu Kida, Toshiaki Sawano, Kazuhiko Minakuchi
Reinforcing Effects And Mechanical Properties Of Rc Beam With Cfs Under Static And Running Loads, Ming-Chien Hsu, Tadashi Abe, Tetsukazu Kida, Toshiaki Sawano, Kazuhiko Minakuchi
Journal of Marine Science and Technology
Through a series of experiments on RC beams reinforced with the carbon fiber sheet (CFS) under the static and running loads, the authors verified the effects of the aspect ratio (ratio of beam width to depth) and CFS reinforcement on the failure mechanism. The experiments revealed that: (1) CFS can effectively reinforce beams subjected to static loads in the flexural region, and increase the strength of beams subjected to running loads but such beams failed in shear, and (2) the tensile strength of CFS is greatly influenced by the aspect ratio. The authors evaluated how the aspect ratio influences the …
A Damping Constant Limitation Design Of Power System Stabilizer Using Hybrid Differential Evolution, Yung-Sung Chuang, Chi-Jui Wu
A Damping Constant Limitation Design Of Power System Stabilizer Using Hybrid Differential Evolution, Yung-Sung Chuang, Chi-Jui Wu
Journal of Marine Science and Technology
This paper is used to investigate a novel design of lead-lag type power system stabilizers for a multi-machine power system. In the design procedures, the minimum damping constants requirements of all of electromechanical modes can be designated and several typical operating conditions can be considered at the same time. The hybrid differential evolution (HDE) method is used to tune the parameters of power system stabilizers. In the design procedures, a region in the left half complex plane bounded by a line with a given negative real value is given. Thus, at the final step of the HDE, all of electromechanical …
Dynamic Characteristics Of Wide Exponential Film-Shape Slider Bearings Lubricated With A Nonnewtonian Couple Stress Fluid, Jaw-Ren Lin, Rong-Fang Lu, Chi-Ren Hung
Dynamic Characteristics Of Wide Exponential Film-Shape Slider Bearings Lubricated With A Nonnewtonian Couple Stress Fluid, Jaw-Ren Lin, Rong-Fang Lu, Chi-Ren Hung
Journal of Marine Science and Technology
On the basis of the Stokes micro-continuum theory, the nonNewtonian effects of couple stress fluids upon the dynamic characteristics of wide exponential-shaped slider bearings are presented in this paper. To take into account the couple stress effects arising from a Newtonian lubricant blended with various additives, the nonNewtonian couple-stress dynamic Reynolds-type equation is applied to calculate the bearing dynamics. According to the results obtained, the effects of couple stresses signify a decrease in the friction parameter and the volume flow rate, as well as an increase in the loadcarrying capacity, the dynamic stiffness coefficient and the dynamic damping coefficient for …
Modeling The Effective Elastic Modulus Of Rc Beams Exposed To Fire, Jui-Hsiang Hsu, Cherng-Shing Lin, Chang-Bin Huang
Modeling The Effective Elastic Modulus Of Rc Beams Exposed To Fire, Jui-Hsiang Hsu, Cherng-Shing Lin, Chang-Bin Huang
Journal of Marine Science and Technology
This work combines thermal and structural analyses to study the effect of fire on the elastic modulus of reinforced concrete beams. The thermal analysis uses the finite difference method to model the temperature distribution of a reinforced concrete beam maintained at high temperature. The structural analysis, using the lumped method, is utilized to calculate the effective elastic modulus of reinforced concrete beams. The results of the thermal analysis are compared to the experimental results in the literature, and the analytically derived structural results are also compared with experimental data on the flexural behaviors of RC beams exposed to fire. The …
Cargo Terminal Shift Setting And Manpower Supplying In Short-Term Operations, Shangyao Yan, Chung-Kai Chen, Chia-Hung Chen
Cargo Terminal Shift Setting And Manpower Supplying In Short-Term Operations, Shangyao Yan, Chung-Kai Chen, Chia-Hung Chen
Journal of Marine Science and Technology
In this research, we develop two short-term manpower supply models from air cargo terminal perspectives. The models are expected to be effective tools for air cargo terminals to plan their manpower supplies and shift schedules. We first incorporate two flexible management strategies and the related operating constraints into the development of a mathematical programming model. By suitably modifying the model, we then construct a strategic model, involving different combinations of manpower supply principles, which can help air cargo terminals manage more effectively their terminal manpower supplies. To evaluate the models in practice, we perform a case study using real operation …
Development Of A Cost Effective Mini Autonomous Underwater Vehicle, Chiu-Feng Lin, Chyuan-Yow Tseng
Development Of A Cost Effective Mini Autonomous Underwater Vehicle, Chiu-Feng Lin, Chyuan-Yow Tseng
Journal of Marine Science and Technology
This paper describes the development of a cost effective mini autonomous underwater vehicle. The mini size of the vehicle is achieved by extracting the control module hardware out from the vehicle vessel and by reducing the on-board sensors. The control of the vehicle is conducted by a base station wirelessly telecommunicating with the vehicle. Furthermore, the reduction of the sensors also reduces the cost of the vehicle. For the purpose, in the vehicle, a single sensor featuring a CCD camera is mounted at the front of the vehicle. The images taken by this CCD camera are used both for obstacle …
Bearing Capacity Of Foundations On Sand Using The Method Of Slip Line, Meen-Wah Gui, Muhunthan
Bearing Capacity Of Foundations On Sand Using The Method Of Slip Line, Meen-Wah Gui, Muhunthan
Journal of Marine Science and Technology
The accurate prediction of the bearing capacity of shallow foundations on granular soils has been complicated by their stress dependent strength behavior and the surface roughness of the foundationsoil interface. These are accounted for using empirical relations in the current state of practice. In this study, the stress dependent behavior of soils is accounted for using a strength dilatancy relationship. The method of slip line has been extended to incorporate this relationship and the effects of surface roughness to derive the depth dependent bearing capacity factor Nq. The results are presented in terms of angle of friction, depth/diameter ratio, and …
Experimental Study On The Performance Of Ship Fire Protection Materials, Jen-Chieh Lee, Shi-Jie Liu
Experimental Study On The Performance Of Ship Fire Protection Materials, Jen-Chieh Lee, Shi-Jie Liu
Journal of Marine Science and Technology
The performance of heat insulation, sound absorption and insulation of ship fire protection materials is experimentally investigated in this paper. The fire protection materials of rock wool 60 k (60 kg/m3 ) and ceramic fiber 80k (80 kg/m3 ) are tested to show the requisite minimum thickness for the regulation of IMO heat insulation A class. The results show that the heat insulation performance of ceramic fiber (25 mm) and rock wool (50 mm) meets the requirement of A-30 class bulkhead. However, the composition of ceramic fiber (25 mm) and rock wool (25 mm) with the ceramic fiber exposed to …
State Variance Constrained Fuzzy Control Via Observer-Based Fuzzy Controllers, Wen-Jer Chang, Balasingam Yeh, Yu-Teh Meng
State Variance Constrained Fuzzy Control Via Observer-Based Fuzzy Controllers, Wen-Jer Chang, Balasingam Yeh, Yu-Teh Meng
Journal of Marine Science and Technology
In this paper, a state variance constrained design method is developed to deal with the observer-based fuzzy control problem for continuous Takagi-Sugeno (T-S) fuzzy stochastic models. The stability problem considered in this paper is a standard feasibility problem with several Linear Matrix Inequalities (LMIs), which can be solved numerically using the interior-point method. The purpose of this paper aims at finding observer-based fuzzy controllers such that the closed-loop system is asymptotically stable and the state variance performance constraints are satisfied. Finally, a numerical example is included to demonstrate the effectiveness of the proposed controller design method.
Performance Analysis Of Mc-Cdma Communication Systems Over Nakagami-M Environments, Joy Iong-Zong Chen
Performance Analysis Of Mc-Cdma Communication Systems Over Nakagami-M Environments, Joy Iong-Zong Chen
Journal of Marine Science and Technology
The performance for a MC-CDMA (multi-carrier coded-division multiple-access) system working in uncorrelated and correlated fading channels with Nakagami distribution is investigated in this paper. We adopt the BPSK modulation scheme with an alternative expression for Q-function to evaluate the BER (bit error rate) performance of the MC-CDMA system. The sum of Gamma variates is adopted for deriving a closed-form solution for arbitrarily correlated channel in order to avoid the difficulty of explicitly obtaining the pdf (probability density function) for the SNR (signal-to-noise ratio) at the MRC (maximum ratio combining) output. The results with simple expression obviously show that the BER …