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.

The research aims to 1) promote historic and cultural tourism at royal temples in Ayutthaya province; and to 2) identify ways of promoting cultural tourism sustainably. The research methodology is mixed-method. The quantitative data was collected from approximately 400 Thai tourists by means of questionnaires. The qualitative data was collected by means of interviews with 8 tourism stakeholders in Ayutthaya province. Data were analyzed to identify the frequency percentage mean (x̅) and standard deviation (S.D.) using SPSS. The research found that Thai tourists and tourism stakeholders support measures to develop Royal temples in Ayutthaya including: 1)Wat Phra Sri San Phet; 2) Wat Panan Cheng Worawiharn; 3) Wat Na Phra Maen; 4) Wat Kasattra Thirat; and 5) Wat Phrom Niwat. In order to develop this royal temples there should be co-operation between locals and the private sector to promote sustainable tourism and to preserve the beautiful heritage sites as world heritage sites. The private sector and locals should support sustainable tourism activities and Thai culture to attract tourists who can encourage socio-economic development. In addition tourism facilities should be developed such as tourism landscapes parking areas tourism information public toilets and facilities for the elderly and disabled. Tourism policy should be supported through co-operation between locals and tourism stakeholders. Tourism management authorities and locals should support activities to preserve culture in order to attract more tourists and increase tourism revenue.

The objective of this study was to construct the black pepper prices forecasting model by 4 statistical methods: Box-Jenkins method Holt’s exponential smoothing method Brown’s exponential smoothing method and damped trend exponential smoothing method. Time series of monthly black pepper prices which were gathered from the website of the Office of Agricultural Economics during January 2005 to December 2018 of 168 observations were divided into 2 datasets. The first dataset had 156 observations from January 2005 to December 2017 for constructing the forecasting models. The second dataset had 12 observations from January to December 2018 for comparing the accuracy of the forecasts via the criteria of the lowest mean absolute percentage error (MAPE) and root mean squared error (RMSE). Research findings indicated that for all forecasting methods that had been studied the most accurate method was damped trend exponential smoothing method (MAPE = 6.5773 RMSE = 10.3775)

This research aimed to this research aim: 1) to study the problems of the National Museums in Central Region of Thailand 2) to study The Guidelines of Marketing Development of Arts and Sciences Educational Attraction of the National Museums in Central Region of Thailand. This research is qualitative research with interviews. The researchers also studied theories involved from documents includes Marketing Mix (7P’s). The sample group used in this study is the officers involved in the Central National Museum. The tools used in this research are interviews. This research found that Products and services the three national museums products or antiques Is interesting and distinguished in itself. Service characteristics of the museum focus on providing educational services providing information to interested parties. The price of collecting admission fees and using the premises according to the regulations of the Fine Arts Department. Location convenient transportation both private cars and public transport. Marketing promotion there are books brochures brochures and information systems through computer networks. Personnel or employees there are good work intentions good service smiling. Physical environment the building is quite old. It should improve modern display techniques. Processes Group visits are usually contacted in advance in order to arrange a guest speaker. Suggestions for museum development Products and services should consider the enjoyment of the visitors learning including receiving details of meaningful signs. Location adding a sign showing a large museum entrance. Marketing promotion should advertise through various online media should organize creative learning activities. Physical environment should improve modern display techniques. Processes adding a tourist center help to inform visitors of the rules and regulations for visiting museums for proper conduct.

The objective of this research was to isolate plant growth promoting rhizobacteria from Wedelia trilobata (L.) A.S. Hitchcock rhizosphere and preliminarily test their plant growth promoting properties such as nitrogen fixation siderophore production phosphate solubilization and indole-3-acetic acid production. Forty-seven bacterial isolates were obtained including 26 isolates of gram positive 18 isolates of gram negative and 3 isolates of actinobacteria. After that 8 isolates (including BWTM1_MSU BWTM2_MSU BWTM5_MSU BWTM6_MSU BWWM6_MSU BWWM8_MSU BWWM9_MSU and BWWM16_MSU) were selected for studying on root colonization and plant growth promoting properties under aseptic condition. The results showed that BWTM5_MSU had the evident on the promotion of plant growth with the most percentage of rice seed germination (63.33%) high level of root and shoot length with 6.11 cm and 3.89 cm respectively. As a result the root and shoot fresh weight was as high as 9.56 mg and 11.33 mg respectively. It also correlated with the highest production of indole-3-acetic acid up to 421.29 ug/ml. The root colonization was studied by counting rhizobacteria isolate BWTM5_MSU from rice rhizoplane and rhizosphere with presented bacterial number at 9.67x106 CFU/g root and 1.64x10 10 CFU/g soil respectively.