The objectives of this experimental research were: 1) to develop Web-based Instruction (WBI) on “Op-Amp and Linear IC Simulation Using Multisim Version 11.0 Case Study of Chainat Technical College 2) to evaluate the developed WBI 3) to compare the students’ learning achievements before and after using the developed WBI and 4) to find the students’ satisfaction after the developed WBI. The sample of this research was 30 students in Vocational Diploma at Chainat Technical College in the academic year 2/2012 selected by purposive sampling method. The tools used in this research were the six lessons of the developed WBI using Moodle pretest exercises posttest and worksheets. The results of this research were shown as follows: 1) the developed WBI included 6 learning lessons. 2) the efficiency of the WBI was 83.14/80.20 higher than the criteria. 3) the students effectiveness after using the developed WBI was significantly higher than before using it at .05. 4) the students’ satisfaction was at a good level. In conclusion the developed WBI can be used for the target group properly.

This research proposes the variance estimation method of Pareto data and to compare three variance estimation methods. Those methods are simple method the adjusted variance method with term (n - 1)/n and the adjusted variance method with term (n - 2)/n. The research was considered by the absolute of bias (|Bias|) the mean absolute errors (MAE) and the mean square errors (MSE) of variance estimator. This research used Monte Carlo Simulation method. Results of this research show that the |Bias| of simple method is the lowest for almost all conditions. We can arrange the methods as follows: the adjusted variance method with term (n - 1)/n and the adjusted variance method with term (n - 2)/n respectively. For all situations the MAE and MSE the of adjusted variance method with term (n - 2)/n is the lowest. We can arrange the methods as follows: the adjusted variance method with term (n - 1)/n and simple method respectively.

High petroleum cost nowadays and expectedly in the future is a major force driving the cost up in every industrial sector. In metal forming industry tooling design is a very important and costly process in the design and development phase. By a traditional means trial-and-error approach requires continuous corrections causing many problems to manufacturers since tooling corrections and real scale experiments are very costly and inefficient consumption of limited natural resources. As a result simulations via computer models play an important role in the present time. An important tool to this problem solving in the sheet metal forming industry is a nonlinear finite element method. When it works together with proper material models it has potential and is suitable for applications in the current 21st century to efficiently analyze and design manufacturing processes especially in sheet metal forming.

The objectives of this research are to propose a proper model for risk assessment for drought in Thailand. A hidden Markov model is adopted. The results indicate that the amount of rainfall depends on the hidden states drought or non-drought state. If the state changes from drought to non-drought the amount of rain will increase. The probability of changing from drought state to non-drought state is higher than from drought state to drought state. The probability of drought occurrence in February is highest followed by in November March December January July April June October September August and May respectively. When the temperature increases the probability of drought occurrence will increase.

The main problems of learning skills of a physics I for engineer’s course due to the lack of standard computer assisted instruction multimedia and its abstract nature therein were improved and repelled by using the invented teaching animation modules. Applying the established e-learning multimedia modules to the registered students from many faculties of the Rajamangala University of Technology Phra Nakorn via the learning management system it found that the improvement recipes have appropriate to increase both the learning skills and their highly attitude to this subject. The improved students by the invented media can effectively apply the contents to the higher levels study of concerning subjects.