This research aims to apply the principle of stochastic process for modeling. The parameters are estimated using Bayesian methods. The monthly average real price of paddy rice 15% and yield of paddy rice in Thailand were studied. The price and the yield of paddy rice which are time series data consisting of four components autocorrelation an exponential cumulative distribution function for trend outliers and two different types of seasons: the dummy seasons and Fourier function seasons. Writing algorithms programming in OpenBUGS and evaluating the performance of models from simulation programming in R were conducted. After that Bayesian methods with dummy seasons and Fourier function season were compared using RMSE MSE and MAE as the criteria. The results show that the Bayesian model with an exponential cumulative distribution function for trend and dummy seasons give the lowest RMSE MSE and MAE for both model fitting and model validating.

The purpose of this research is to study demographic characteristics towards buying decision on cosmetic product of consumers in Bangkok. The Research also involves in studying behavior of consumers to purchase the cosmetic product via beauty blogger. The methodology through questionnaire is a primary and qualitative research methodology through in-depth interview is supportive. The data is collected from 400 samples whose age are more than 18 years old and 9 key informants from 5 areas. The research found that the demographic majority of respondents are female aged between 18-30 years old Bachelor’s degree and single. Their monthly income are less than 10000 baht. The evaluation of alternative selection post-evaluation problem recognition and information gathering mostly affect the buying decision respectively. The research also reveals that occupation affects the buying decisions especially business owners because of either their higher income of their beauty concern.

This research aims to study the using oil palm fiber to develop cement-bonded fiberboard product. The mixture ratios of Portland cement type1: fine sand: oil palm fiber:tap water: catalyst are 1 : 1.95 : 0.05 : 0.40 : 0.03 1 : 1.94 : 0.06 : 0.40 : 0.03 1 : 1.93 : 0.07 : 0.40 : 0.03 1 : 1.92 : 0.08 : 0.40 : 0.03 and 1 : 1.91 : 0.09 : 0.40 : 0.03 by weight. The cement-bonded fiberboard samples are cast in 30 x 30 x 1.5 centimeter in dimension. The cement-bonded fiberboard sample testing follows the TIS 878-2537. The results show that the density thermal conductivity bending strength modulus of elasticity and tension perpendicular to surface of cement-bonded fiberboard with high quantity of oil palm fiber are lower than cement-bonded fiberboard with low quantity of oil palm fiber while that the water absorption and swelling in water of cement-bonded fiberboard with high quantity of oil palm fiber are higher. However all of oil palm fiber samples with lower than 0.06 of ratio can pass the standard.

The study aimed to :1) create a standard formula for frozen rice berry flour Khnom Tien 2) study the defrosting process using a microwave and 3) evaluate consumers’ acceptance. The physical properties sensory evaluation chemical composition and microbiological quality were studied. To create the formula substitution of riceberry flour for sticky rice flour at 20 30 and 40% weight per weight were used and studied. It was found that Khnom Tien with 20% of rice berry flour in substitution for sticky rice flour was accepted most on appearance smell taste and overall appearance but texture (stickiness) was accepted at “a little level”. To improve the texture arrowroot flour was added to increase amylopectin. The result showed that the addition of 7.5% arrowroot flour for the total flour weight was most accepted in all aspects. The results of the physical quality analysis indicated that the stickiness value was to that of the basic formula. The standard formula of riceberry Khnom Tien contained 80% sticky- rice flour 20 % of rice berry flour to sticky- rice flour (w/w) 7.5% of arrowroot flour to the total flour weight(sticky rice flour and riceberry flour weight)500g palm sugar and 800g Gnaphalium affine juice. Microwaving at 600 watts for 2 minutes or at 800 watts for 1.30 minutes could be used in defrosting Khnom Tien. The product could be kept for 60 days at -18 ºc; none of the microorganism yeast or mold was found. One hundred grams of the product provided 249.4kcal energy 5.17g carbohydrate 1.12 fat 3.66g protein 0.41g fiber and 0.81mg anthocyanin. The consumers accepted the product at “much” and “moderate” levels; 95% of them were interested in buying the product sold in a department store/ supermarket at 36 baht for one plastic box containing 4 pieces of Khnom Tien.

This research aims to study the using basalt rock fragments to develop as interlocking block product. The mixture ratios of Portland cement type1: basalt rock fragments are 11 : 6 1 : 6.5 1 : 7 1 : 7.5 and 1 : 8 by weight and water per cement ratio was 0.6 by weight. The interlocking block samples are cast in 10 x 20 x 10 cubic centimeter of dimension with manual compression molding machine. The interlocking block samples were tested in accordance with TCPS 602-2547 standard which subjected for the interlocking block. The results show that the weight compressive strength and thermal conductivity of interlocking blocks with high quantity of basalt rock fragments are lower than interlocking blocks with low quantity of basalt rock fragments while that the water absorption of interlocking blocks with high quantity of basalt rock fragments are higher. From this research the medium and small enterprises could choose the proper ration for the interlocking block production mixing basalt rock fragments as per requirement.