Taiwan Association of Engineering and Technology Innovation: E-Journals
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Vibration Analysis of Thermoelastic Micro Beam with Double Porosity Structure
Get PDFThe present investigation is concerned with vibration analysis of a homogeneous, isotropic thermo elastic micro beam with double porosity structure subjected to sinusoidal pulse heating. Lord-Shulman [1] theory of thermo elasticity with one relaxation time is used to solve the problem. Laplace transform technique has been used to obtain the expressions for lateral deflection, axial stress, axial displacement, volume fraction field and temperature distribution. A numerical inversion technique has been applied to recover the resulting quantities in the physical domain. Variations of axial displacement, axial stress, lateral deflection, volume fraction field and temperature distribution against axial distance are depicted graphically to show the effect of porosity and relaxation time parameters. Some particular cases are also deduced.
Analysis of Feature Extraction Methods for Speaker Dependent Speech Recognition
Get PDFSpeech recognition is about what is being said, irrespective of who is saying. Speech recognition is a growing field. Major progress is taking place on the technology of automatic speech recognition (ASR). Still, there are lots of barriers in this field in terms of recognition rate, background noise, speaker variability, speaking rate, accent etc. Speech recognition rate mainly depends on the selection of features and feature extraction methods. This paper outlines the feature extraction techniques for speaker dependent speech recognition for isolated words. A brief survey of different feature extraction techniques like Mel-Frequency Cepstral Coefficients (MFCC), Linear Predictive Coding Coefficients (LPCC), Perceptual Linear Prediction (PLP), Relative Spectra Perceptual linear Predictive (RASTA-PLP) analysis are presented and evaluation is done. Speech recognition has various applications from daily use to commercial use. We have made a speaker dependent system and this system can be useful in many areas like controlling a patient vehicle using simple commands
Causal Relationships Among Factors Affecting the Buildability in Executing Construction Projects in Vietnam
Get PDFThis paper aims to identify causal relationships among factors affecting the buildability in executing construction projects in Vietnam. First, through a comprehensive literature review, the study identified a full set of attributes that affect the buildability of construction projects. Subsequently, through discussions and interviews with experts, the study determined main attributes affecting the buildability in the context of the construction industry in Vietnam. After that, a survey questionnaire was developed which was based on identified attributes. The data after collected, was analysed by Structural Equation Model (SEM) and the expected result from the SEM model is a structural model. This structural model includes four factors, namely: Design applies advanced machinery, materials and construction methods; Design uses available resources at local for saving costs; Design applies safe construction methods; and Design uses prefabricated and typical components. The key finding of the study is to provide insights into causal relationships among factors affecting the buildability in executing construction projects in Vietnam
Analysis of the Correlation Between the Support Performance of Supported Business for the Regional Industry
Get PDFReflecting the conditions and characteristics of Korea, the region's main industry is being developed to expand new job creation in the region and enhance the competitiveness of local industries. The local main business is supported to 63 main industries selected by region. The main industries in Busan include digital contents, intelligent machine parts, super precision convergence parts, mold heat treatment, and bio-health. In this study, the main industries of Busan region in 2016 conducted an analysis on the companies that support the intelligent machine parts industry. For the analysis, we collected data on the sales of supported companies, sales after business support, and employment growth. The analysis tool utilized IBM SPSS statistics 18. As a result, we confirmed the relationship between employment and sales according to support business programs. Based on the results of this study, it will be helpful for the task performing organization to identify the direction of the support program and the needs of the enterprise
Flow Analysis of Underwater Water Jet System Using Computational Fluid Dynamics and Particle Image Velocimetry
Get PDFThe width and depth of excavation are important for the development of a water jet system for underwater surface excavation in the water. This is determined by the pressure distribution affecting the ground. Therefore, it is necessary to analyze the flow of the water jet, but it is difficult to grasp visually, and generally used sensors are difficult to use in water. To overcome this problem, the flow analysis was simulated by using Computational Fluid Dynamics(CFD), Particle Image Velocimetry(PIV) experiment was performed to confirm the accuracy of CFD and to visualize the nozzle flow. The CFD was simulated by using MIDAS NFX and various pressures of nozzle injection, velocity distribution and pressure distribution were analyzed. For the PIV experiment, the water jet system is installed at L22m x W3.5m x D3m water tank, and a 5W Nd-yag laser was installed at the surface of the water, and a high-speed camera was installed to capture the flow in the side observation field. And particles of 20 micrometer size were mixed in the water. In the results of the CFD simulations, the nozzle injection pressure which is the measurable velocity by the PIV system was selected, the nozzle flow was visualized and the velocity distribution was measured by using the PIV experiment. The velocity distribution measured by PIV is compared with the CFD - analyzed velocity distribution under the same conditions
On the Analysis of Product Appropriateness Principles
Get PDFThe purpose of this study is to explore appropriateness of the various products presented in the market and the application of appropriateness principles to the product design. To obtain appropriateness principles, this study compares and analyzes a variety of products available in the market. After obtaining preliminary principles, many times convergence and analysis are operated for getting more accurate principles. Then, AHP method is used for evaluating importance of every appropriateness principles and appropriateness principles are obtained. And, the appropriateness principles are used to construct the design process of appropriateness product. Finally, some design cases are operated and appropriateness principles are evaluated for the products of design cases. The results of this study are obtained 10 appropriateness principles: freedom, demand, environmental protection, effectiveness, intuition, compliance, simplicity, optimal performance, simplicity, fault tolerance. And, weights of appropriateness principles get in this paper
EWMA Controller with Concurrent Adjustment for a High-Mixed Production Process
Get PDFThe exponentially weighted moving average (EWMA) feedback controller is a very popular run-to-run (RtR) process control scheme in the semiconductor industry. Traditionally, the manufacturing environment was simplified as a single product and single tool process. In the feedback control, the adjustment of the recipe for the next run is related to the deviation of the current output against the desired target. However, in a commercial foundry, every tool always works for many products. It is called a multiple products and single tool (MPST) process. The challenge of this process is how to adjust the recipes among different products in a production row.In this study, a modified threaded EWMA feedback controller, the EWMA with concurrent adjustment, is proposed to deal with the issue of multiple products in a tool. When the process disturbances follow an IMA(1,1) time series model, the stability of the proposed method will be proven. The optimum discount factors of the proposed EWMA controller will be investigated by several simulations in terms of the number of multiple products, their distribution and the scheduling of the process. Moreover, according to results of the performance comparisons with threaded EWMA, the proposed controller is advantage in the large number of multiple products and in low-frequency products
Changes of E-KERS Rules to Make F1 More Relevant to Road Cars
Get PDFToday’s F1 hybrid cars are based on very similar power units made up of about the same internal combustion engine (ICE) and energy recovery system (ERS). Because of restrictive design rules permitting too much fuel per race, the internal combustion engine is not particularly fuel efficient. The methodology is based on lap time simulations and telemetry data for a F1 H car covering one lap of the Monaco Grand Prix. The methodology is based on lap time simulations and telemetry data for a F1 H car covering one lap of the Monaco Grand Prix. The present limit of 100 kg of fuel per race is excessive. The low power energy recovery system is used strategically rather than fuel savings recovering very little braking energy. The 4 MJ of storable energy is used only when it is strategically needed. The 2 MJ of recoverable energy allowed per lap are almost never collected. To return to be technically attractive, F1 should permit much more freedom in the definition of the ICE and the ERS. As the goal of the rules should be lowering the fuel consumption while keeping technical and sporting interest high, the best solution is more freedom to achieve the fastest car within more stringent limits of fuel economy. A real limit to the total fuel consumption for a race track like Monte Carlo should be not more than 80 kg of fuel. This would translate in more energy recovery to the ERS per lap and better fuel efficiency of the ICE and will certainly help more the design of passenger cars
Simulation-Based Performance Comparison for Variants of Spray and Wait in Delay Tolerant Networks
Get PDFDelay Tolerant Network (DTN) has been proposed to deliver data packets in an intermittently connected network by the store and carry technique. Among many existing routing protocols in DTN, spray and wait and its variants are based on replication by allowing the number of copies per message in the network but they still include some problems. To address energy issue and delivery ratio, we have presented the spray and fuzzy forwarding (S&FF) to employ the fuzzy inference systems (FIS). However, since our previous performance comparisons are simply evaluated over few cases, more extensive simulation scenarios need to be executed for accurate performance comparison. Based on this demand, in this paper, we compare S&FF with some variants of spray and wait in diverse aspects and provide analysis for their simulation results. Through the simulation results, we can observe that delivery ratio is acceptable while extending network lifetime in S&FF rather than comparable protocols under varying deadlines, the number of nodes and velocities.
Thermal Analysis of a Cracked Half-plane under Moving Point Heat Source
Get PDFThe heat conduction in half-plane with an insulated crack subjected to moving point heat source is investigated. The analytical solution and the numerical means are combined to analyze the transient temperature distribution of a cracked half-plane under moving point heat source. The transient temperature distribution of the half plane structure under moving point heat source is obtained by the moving coordinate method firstly, then the heat conduction equation with thermal boundary of an insulated crack face is changed to singular integral equation by applying Fourier transforms and solved by the numerical method. The numerical examples of the temperature distribution on the cracked half-plane structure under moving point heat source are presented and discussed in detail