This objective of this research is to study the development of the pararubber tapping knife in order to determine the optimum of the edge and oblique angle and to compare the efficiency of the electrical motor and Je-Bong knife. The product was manufactured by iron steel carbon S45C and AISI 5160 with 75-90 degree edge knife and 0-45 degrees oblique angle. The results can be concluded that the optimum condition of the edge knife oblique knife and the cutting force were 75 degree 45 degree and 3.51-51.42 N respectively. It was found that the cutting force was straightly increased form 0-51.42 N and then gradually decreased. The energy consumption of timber cutting was 0.00370 J/mm3. The quality of the rubber tap using electrical motor was 72.07% which was higher than 2.8 of Je-Bong knife. As the results this product shows the average of rubber timber which is 2.22 mm. in 22.51 s.

The purpose of this research are 1) Study of the knowledge in home economics of lower level than higher education at Nakornpathom vocational college. 2) Study motivation to attend class in home economics subject of lower level than higher education of Nakornpathom vocational college. 3) To study the relationship between personal factors and motivation to attend in home economics of lower level than higher education at Nakornpathom vocational college. 4) To study the relationship between knowledge and motivation in home economics subject of lower level than higher education at Nakornpathom vocational college.The sample were 228 students that studying in the vocational certificate and high vocational certificate in home economics in the academics year 2016 at Nakornpathom vocational college. The research instrument are questionnaire and statistics used in data analysis were frequency value percentage average standard deviation and Pearson Chi-Square. Data were anayzed by used a computer program. The research result found that 1) The most home economics students in lower level than higher education at Nokornpathom vocational college have knowledge in home economics is in the middle level. 2) The students have opinion about motivation to attend class in home economics subject at Nokornpathom vocational college in overall is high level. When considered each section it was found that the level was high level in all section. 3) The personal factors were sex field of study cumulative grade point acerage (GPA) have related with motivation to attend class in home economics of lower level than higher education at Nakornpathom vocational college is statistically significant at .05 level. And 4) The knowledge about home economics have related with motivation to attend class in home economics of lower level than higher education at Nakornpathom vocational college can classified in many sections were the teaching and learning pride in the field of study relationship to teachers relationship to friends and the classroom environment is statistically significant at .05 level.

Four core helicopter project (Con Rotor) that coordinates with a GPS unit with a survey prepared for aerial photography and GPS positioning system with GPS and the flight logs with GPS. Making helicopter 4 cores with GPS coordinates tell this from a detailed study of helicopters and other equipment Axis 4 (Con Rotor) study of a GPS system microcontroller. By applying a helicopter and make a 3-core microcontroller. The result of doing this project is. Four core helicopter with GPS coordinates that can shoot air and signaling devices to the receiver and lock position without flying via remote control.