This research aimed to explore the teachers’ and students’ understanding of science concepts in secondary schools in Thailand and to suggest to proposed ICT learning model to make students aware of current science i...
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This research aimed to explore the teachers’ and students’ understanding of science concepts in secondary schools in Thailand and to suggest to proposed ICT learning model to make students aware of current science issues impacting on the society. A total of 165 (15 teachers and 150 Students) participated in the study. Students were from years 10, 11and 12 who studied information and communication technology subject in year 2012 and teachers who taught the same course. Research instruments consisted of a questionnaire, interview form for teachers, classroom observations and video recordings. The study was based on a widespread popular and influential conceptual modeling representation theory. In the model, ICT supports internal learning processes of representation (creating and self-organizing knowledge) and promotes collaboration and interaction (social processes and making meaning). Based on the results of this study a model has been developed in association with researchers from Western Australia and Thailand. It will be implemented in Thailand in early 2013. This model is tended to be more connected to people outside of the classroom rather than isolated, and the learning process tended more often to contribute to productive outcomes such as the solving of authentic problems.
Chicken collagen casings could be an alternate source of collagen casings that are manufactured for sausages. The overall objective of this project was to extract chicken collagen from by-products of the broiler proce...
Chicken collagen casings could be an alternate source of collagen casings that are manufactured for sausages. The overall objective of this project was to extract chicken collagen from by-products of the broiler processing industries and to explore the possibility of making films. Chicken skin was washed, ground, and pretreated to remove the noncollagenous compounds. Collagen was extracted using acetic acid and pepsin. Solubilized collagen was salted-out and centrifuged at 20,000 ×g at 4°C for one hour. The precipitates were dissolved in 0.5 M acetic acid anddialyzed against 0.1 M acetic acid anddistilled water before freeze-drying. Molecular weight, collagen solubility at different ph values, and NaCl concentrations were determined. TA-XT2 texture analyzer was used to characterize mechanical properties of collagen films. The highest collagen solubility was obtained at ph 2 and 2% NaCl. Hand-homogenized, nonfiltered, and conditioned samples had the highest hardness (3,262 g) and the least brittleness (30.5 mm). These results demonstrate that chicken collagen extracted from chicken by-products has the ability to form films and could be considered for making casings or be used in various other industries.
The main objective of this research is to build upon existing cryptographic standards and web protocols to design an alternative multi-factor authentication cryptosystem for the web. It involves seed exchange to a sof...
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The main objective of this research is to build upon existing cryptographic standards and web protocols to design an alternative multi-factor authentication cryptosystem for the web. It involves seed exchange to a software-based token through a login-protected Transport Layer Security(TLS/SSL)tunnel, encrypted local storage through a password-protected keystore(BC UBER) with a strong key derivation function(PBEWith SHAANdTwofish-CBC), and offline generation of one-time passwords through the TOTP algorithm(IETF RFC6239). Authentication occurs through the use of a shared secret(the seed) to verify the correctness of the one-time password used to authenticate. With the traditional use of username and password no longer wholly adequate for protecting online accounts, and with regulators worldwide toughening up security requirements(i.e. BSP 808, FFIEC), this research hopes to increase research effort on further development of cryptosystems involving multi-factor authentication.
Many traditional requirements engineering and elicitation techniques assume that the requirements being developed are high-level requirements for a new, "green-field" system. However, this is not always the ...
Many traditional requirements engineering and elicitation techniques assume that the requirements being developed are high-level requirements for a new, "green-field" system. However, this is not always the case. In establisheddomains, such as the aerospace domain, systems are often developed as new members of existing product lines. In these cases, a significant amount of architectural design knowledge already exists within the product line, and the need is for detailed engineering requirements rather than high-level requirements. To address this situation, we present the Co-Evolving Traceable Requirements and Architecture Network COTRAN), a novel collaborative requirements engineering technique that elicits detailed engineering requirements for new product line members through tagging architecture artifacts. Two experience studies have evaluated the COTRAN technique. The first was an industry experience in the aerospace domain. The objective of this industry experience was to apply the COTRAN technique to develop detailed engineering requirements in a relevant target field, on an actual "live" project, and observe the effects of verifiability and traceability of the requirements for the project. The industry experience demonstrated that COTRAN enabled mapping of requirements to the projects artifacts, demonstrating traceability from requirements to architecture. Also, the industry study demonstrated measurable improvements in verifiability of these requirements, through defining success criteria of the requirements that were guided by tagging architecture artifacts. The second was a classroom experience at a large northern California university. The COTRAN technique was incorporated in the curriculum of a graduate course in Requirements Engineering for the universitys software engineering Masters program. This classroom experience demonstrated that COTRAN enabled mapping of resulting requirements with the students architecture artifacts, demonstrating traceabilit
In this paper, Gas-liquid two phase flow mathematic models of incompressible fluid were proposed to explore the feature of fluid under certain centrifugal force in vertical centrifugal casting (VCC). Modified projecti...
In this paper, Gas-liquid two phase flow mathematic models of incompressible fluid were proposed to explore the feature of fluid under certain centrifugal force in vertical centrifugal casting (VCC). Modified projection-level-set method was introduced to solve the mathematic models. To validate the simulation results, two methods were used in this study. In the first method, the simulation result of basic VCC flow process was compared with its analytic solution. The relationship between the numerical solution anddeterministic analytic solution was presented to verify the correctness of numerical algorithms. In the second method, systematic water simulation experiments were developed. In this initial experiment, special experimental vertical centrifugal device and casting shapes were designed to describe typical mold-filling processes in VCC. High speed camera system anddata collection devices were used to capture flow shape during the mold-filling process. Moreover, fluid characteristic at different rotation speed (from 40rpm, 60rpmand 80rpm) was discussed to provide comparative resource for simulation results. As compared with the simulation results, the proposed mathematical models could be proven and the experimental design could help us advance the accuracy of simulation and further studies for VCC.
The research on the simulation for the through process of low-pressure casting and heat treatment is conducive to combine information technology and advanced casting technology, which will help to predict the defects ...
The research on the simulation for the through process of low-pressure casting and heat treatment is conducive to combine information technology and advanced casting technology, which will help to predict the defects and mechanical properties of the castings in the through process. In this paper, we focus on the simulation for through process of low-pressure casting and heat treatment of ZL114A Bending beam. Firstly, we analyzethe distribution of the shrinkage and porosities in filling and solidification process, and simulate the distribution of stress and strain in the late solidification of casting. Then, the numerical simulation of heat treatment process for ZL114A Bending beam is realized according to the heat treatment parameters and the corresponding simulation results of temperature field, stress, strain, and aging performance are given. Finally, we verify that simulation platform for the through process of low-pressure casting and heat treatment can serve the production practice perfectly and provide technical guidance and process optimization for the through process of low-pressure casting and heat treatment.
Taiwan depends heavily on its tourist trade. The purpose of this study is to use the online platform of blogs to investigate whether emotional contagion, blog attraction and customer perceived value would affect the c...
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Taiwan depends heavily on its tourist trade. The purpose of this study is to use the online platform of blogs to investigate whether emotional contagion, blog attraction and customer perceived value would affect the consumer's intent. The number of valid questionnaire samples is 312, and PLS is used to conduct linear structural equation model analysis. Research results show that blog attraction and customer perceived value have positive effects on purchase intention. Therefore, blog is an important channel to attract consumer's attention.
Considering the solidification, demoulding and heat treatment processes in low pressure casting, relatively complete processes of an aluminium alloy shell casting are simulated to investigate the heat transfer feature...
Considering the solidification, demoulding and heat treatment processes in low pressure casting, relatively complete processes of an aluminium alloy shell casting are simulated to investigate the heat transfer feature and stress behaviours variation of casting in each multi-processes stage. FdM is used to discrete thermal conduction model when studying the heat transfer process, while FEM is adopted to solve the elastic-plastic model when studying the stress behaviour variation. When matching the two models, we map the finite difference mesh to finite element mesh. Three different temperature conditions, namely 300 °C, 400 °C and 500 °C, are simulated when we research the influence of demoulding temperature on stress behaviour. The simulation results demonstrate that the higher demoulding temperature is, the greater casting deformation and the smaller stress value are. The final casting stress status and the initial heat treatment temperature have a different relationship as for different parts of casting.
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