This paper presents the simulation and experimental result of class-E power amplifier. It is often used in designing a high frequency ac power source because its ability to perform the conversion efficiently even at high frequencies with significant reduction of switching losses. This paper aims to compare the transmission performance of electrical power between the air core transformer and iron core transformer which the identical input voltage of 50 VAC. Both transformers are designed to step voltage up (step up transformer) ratio of 1:4.5. The Arduino microcontroller Arduino was used to generate a pulse width modulation (PWM) with operating frequency of 3.74 kHz. IC gate drive TC4422 was used to drive the IRF510 MOSFET. Based on the simulation and experimental results the power loss in air core transformer is 75 percent while power loss in iron core transformer is 0.2 percent. The maximum distance that can transmit electric power of air core transformer is 9.3 centimeters.

This research aims to increasing efficiency in production and eliminate the problem of insufficient production capacity with respect to customer demand for electrical appliance factory by applying the line balancing method. Thus the study then developed two problem-solving approaches. The first approach is a method by which a firm applies the line balancing concept and ECRS technique (Eliminate Combine Rearrange and Simplify). On the contrary the second approach is required an investment in testing machine with value of 1000000 baht in order to support sufficient production capacity to meet customer demand. Also ECRS method is used to accomplish this process. Based on the results the first approach provided the production line efficiency improvement representing of 82.59% and reduced the labor cost of 277220 baht per year. However the loss of commercial opportunity has remained the same of 6336000 baht per year. Accordingly the second approach demonstrated of 92.11% of the production line efficiency improvement and the labor cost reduction valued of 277220 baht per year. As we expected the second approach satisfied production efficiency by eliminating the loss of commercial opportunity with value of 6336000 baht per year delivering a return of investment within two months.

This research aims to evaluate performance ease of use and security of designer bathroom for People with Visual Impairment. To establish criteria for designing bathrooms for people with visual impairment convenient and secure. The testing of bathroom designed for People with Visual Impairment in the ease of use and safety. From a sample of 30 people from evaluating the performance of People with Visual Impairment bathroom. To establish design criteria have been concluded. Orientation access various functions within the toilet should be placed in a triangular pattern. The size of the space available in each section should have a width close to reaching both the left and right or 1:00 to 1:20 meters approximately which led to the creation of the navigation functions. The surface should look different. But both have the same floor area. Case in point empirically for various functions. Use a light spot Or wall colors yellow orange To those who have blurred vision. Use more convenient The height of the counter should not be less than 0.80 meters so that disabled people have to stoop so dangerous. Detailed breakdown of wet and dry areas. The slope should be greater than the lower level. Or the waterproof (CURB) distance from the gate to reach the final (toilet) should be approximately 2:00 to 2:40 meters that should enhance security by using the cushioning material at the wall. Edge counters And bidets The research was to evaluate the efficiency of People with Visual Impairment bathroom. To establish design criteria To be appropriate And safe to use From designing a bathroom for People with Visual Impairment. The result is a conclusion from the test sample only preliminary. The need for additional testing of water and three forms or compare with typical bathroom. From a diverse group of users to have a complete research results and to determine the design criteria occur.

The purposes of this research are : 1) to study the personal factors at tourist in Phrae Province 2) to study is the factors of marketing mix use to purchasing of products Morhom Fabric Dyed in natural color of tourists in Phrae Province 3) to study is purchasing of products Morhom Fabric Dyed in natural color of tourists in Phrae Province 4) the relationship between personal factors with an option to is purchasing of the products Morhom Fabric Dyed in natural color of tourists in Phrae Province and 5) the relationship between marketing mix to purchasing of products Morhom Fabric Dyed in natural color of tourists in Phrae Province. The samples are tourists traveling in Phrae Province and buy products Morhom Fabric Dyed in natural color 405. The instruments are using in research questionnaires and interviews. The statistics are using for data analysis frequency percentage mean standard deviation and Chi-square. The research were found that as follows: 1) Tourists in Phrae Province Most were female aged 31-40 years with a bachelors degree. A career was as a private company employees .The averaged income per month 20001-30000 baht and domiciled in Phra Province. 2) Visitors were to the factors critical to the overall marketing mix at a high level. The first two items in order from most to least found that the side with the highest mean score. The product was the lower cost and minimal personnel.3) Most tourists were purchasing of products Morhom Fabric Dyed in natural color of tourists in Phrae Province for themself or them family. The choice of piece of fabric was dyed the clothing and apparel or garments were buying a shirt at the time of used and decoration shop the cushions as well as sorts of travelers choose and bought a bag with the purchase of products Morhom Fabric Dyed in natural color factors on choosing found that sex education estimate salary and the domicile of tourists was associating with the purchase of purchasing of products Morhom Fabric Dyed in natural color of tourists in Phrae Province .There were no significant correlation. And 5) the relationship between marketing mix to purchase of purchasing of products Morhom Fabric Dyed in natural color of tourists in Phrae Province found not correlation. The statistical significance level. 05.

The purposes of this research were to study and development of plastic fiber furniture : Ruean-Thai Jak-San Group Sri-Pran Sawang-Ha Ang Thong with the study from the test of sampling group of Ruean-Thai Jak-San Group Sri-Pran Sawang-Ha Ang Thong with appropriate qualifications ideal to enter the conversion process with the research results demonstrated hereunder. The results of the research were with findings in respect of Production Analysis Standard Criteria in respect of Design with the mean of 3.99 rated as Good Level. And Satisfaction of the consumers of Ruean-Thai Jak-San Group Sri-Pran Sawang-Ha Ang Thong with the mean of 4.43 rated as Very Good Level. Consecutively in respect the Production with the mean of 3.86 rated as Good Level. Overview with the mean of 4.26 rated as Good Level.