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 has studied the treatment of municipal wastewater with shoe soles as a supporting media for Sequencing Batch Reactor. The objectives of this research were the conditions to for optimize growing Photosynthetic Bacteria (PSB) and understand the treatment efficiencies of municipal wastewater treatment with PSB in Sequencing Batch Reactor (SBR). Three types of shoe soles were applied in this research composed of rubber shoe soles neoprene and EVA and the control without shoe soles. The experimental factors included the essential parameters such as BOD COD SS MLSS MLVSS Phosphorus and Ammonia-Nitrogen. F/M Ratio was adjusted at 0.13 and hydraulic retention time (HRT) was at 5 days. The results indicated that the removal efficiencies of SBR with rubber shoe soles in terms of BOD COD SS phosphorus and ammonia-nitrogen were 87% 80% 94% 53% and 68% respectively. The removal efficiencies of SBR with Neoprene shoe soles in terms of BOD COD SS Phosphorus and Ammonia-Nitrogen were 89% 81% 95% 20% and 73%. The removal efficiencies of SBR with EVA shoe soles in terms of BOD COD SS phosphorus and ammonia-nitrogen were 91% 86% 95% 56% and 74%. The removal efficiencies of SBR without shoe soles in terms of BOD COD SS phosphorus and ammonia-nitrogen were 84% 79% 93% 86% and 67% respectively. The treated wastewater was rather clear low content of suspended solids and no malodor. From overall results the treatment of municipal wastewater by anaerobic sequencing batch reactor with different types of shoe soles was not significant for wastewater treatment efficiencies by anaerobic with any 3 types among of shoes soles can be efficiently applied for municipal wastewater treatment.

The aim of this research is to design a prototype of a male dummy chest for motorcycle crash tests. The primary criteria discussed in this study are based on the unique features of Thai ergonomic body sizes with an age range of the highest fatal rate and the fundamental design of the Hybrid III 50th percentile male crash test dummy. A comprehensive experimental study of crash behavior of the prototype undergoing axial compressive loading is performed using the mutual procedure of cadaveric chest testing. For design criteria the largest chest deflection of 80 mm the maximum acceleration of 38.47g and the absorbed energy of 178.369 Joules are considered in the experiment. The obtained results show a good agreement with the experimental data of other researches in which the capability of the energy absorption depends on impact velocities. In addition the energy absorption capability of this prototype can accurately assess an injury level under AIS 3+. For this reason the first prototype of a male chest dummy is particularly suitable for an assessment of a lower serious injury level in a motorcycle crash test.

The purposes of this research were : 1) to study the personal factors in lower secondary students’ decisions to study in the career Department at the Demonstration School of Ramkhamhaeng University 2) to education study in lower secondary students’ decisions to study in the career Department at the Demonstration School of Ramkhamhaeng University and 3) to individual factors affecting in lower secondary students’ decisions to study in the career Department at the Demonstration School of Ramkhamhaeng University. The population students are studying in lower secondary students’ decisions to study in the career Department at the Demonstration School of Ramkhamhaeng University of 267. The instruments used in research questionnaires and interviews. The statistics used for data analysis were frequency percentage mean standard deviation t-test and One Way ANOVA. The research found that as follows: 1) Most students were male 14 years of age by studying in lower secondary students’3/7 they have a cumulated GPA of 3:01 to 3:50 by living with his father - his mother and the aptitude of most business plans. 2) The factor in choosing in lower secondary students’ decisions to study in the career Department at the Demonstration School of Ramkhamhaeng University overall students in grade 3 with comments in agree. The first two items in order from most to least found that the side with the highest mean score the reputation of the school. The second was the instructor and minimum course content. And 3) individual factors were affecting in lower secondary students’ decisions to study in the career Department at the Demonstration School of Ramkhamhaeng University found that students with gender age year of study. The GPA and the Professional and the aptitude different affect students were learning plans and career groups school not different. Except for students with different shelters affect student learning plans and the career Department at the Demonstration School of Ramkhamhaeng University difference was statistically significant at the .05 level.

The purposes of this research are : 1) effectiveness of teaching of multimedia teaching materials Basic Subjects Inventions About Artificial Flowers for students of Home Economics Saowabha Vocational2) a study of student is satisfaction with teaching of multimedia teaching materials Basic Subjects Inventions About Artificial Flowers for students of Home Economics Saowabha Vocational and 3) the assessing is possibility and the usefulness of the medium of teaching of multimedia teaching materials Basic Subjects Inventions About Artificial Flowers for students of Home Economics Saowabha Vocational. The population of the study is that students of Home Economics Saowabha Vocational 1st year about 19. The instruments used in this research include multimedialearning assessment tests and questionnaires. The statistics used in this study include E1 / E2 average and the standard deviation. The research found that as follows: 1) students were evaluating during the study a performance fee equal to 80.68 and the assessment report. The performance was 85.74 indicating that the medium of instruction multimedia performance was in accordance with the specified criteria. 2) Student satisfaction with teaching the basics of multimedia creationThe flowers were ; 2.1) the invention of paper roses student was satisfacting the high level.The first two items in order from most to least found that the side with the highest mean score. The media was inferior to the benefits they were receiving from the media and the minimum content. 2.2) Artificial flowers from tissue paperstudent has been satisfacting the high level the first two items in order from most to least found that the side with the highest mean score. The benefits were receiving by the media followed by the media minimum and content and 3) the assessing possibility and the benefits of will have been learning the basics of multimedia creation. The Artificial Flowers Overall were experts opine that appropriate possibility and helpful the high level.