The objectives of this study are to 1) examine study selection Home Economics at vocational certificate and high Vocational certificate of learner in Singburi vocational college and 2) To examine the relationship between repondents’ general information and study selection Home Economics in vocational certificate and high Vocational certificate of learner at Singburi vocational college. The sample used were 200 students who is studying in vocational certificate and high vocational certificate at Singburi vocational college. The instrument used in this thesis was questionnaire. The statistics based on the data analysis include percentage frequency values average standard deviation and Chi Square. Analysis of statistical data by a computer program. The finding 1) The learners pay attention to the selection of home economics program at the Vocational Certificate and High Vocational Certificate Singburi Vocational College in general were rated at high level. When considering each side it was found that every side were rated at high level. Sorted average from most to least is career curriculum personal related image of college and the college environment and 2) the relationship between repondents’ general information and study selection Home Economics in vocational certificate and high Vocational certificate of learner at Singburi vocational college found that sex age Grade Point Average (GPA) occupation of parent revenue of parent per month that related with study selection Home Economics in vocational certificate and high Vocational certificate Singburi Vocational College is statistically significant at the 0.05 level.

The sensitivity analysis in efficiency of solar water heater system self-circulated by a stream power was performed in this study. The mathematical model of the system was developed based on the experimental results to predict the available amount of water pumped temperature and pressure in main devices. This system was operated by using a simple flat plate solar collector with an exposed area of 1.58 m2 and a storage tank of 30 liters. The results of systematic performance which performed by math model was compared to the experimental results. It was found that the values of were 5.876% 3.583% and 1.361% for vapor pressure and temperature in the flat plate solar collector and temperature in the storage tank respectively. The system was workable when the solar energy input values were equal to or greater than 584 W/m2 607 W/m2 632 W/m2 and 662 W/m2 for discharge head 1 m 1.5 m 2 m and 2.5 m respectively. From system simulation the system could have the daily average thermal efficiency was between 2.94 – 11.47% and the daily average pump efficiency 0.00057 – 0.0026% depending on the intensity of incident solar radiation and the discharge head of the system.

The purpose of the study was fourfold: 1) to construct a computer-assisted-instruction (CAI) of Basic Thai for Business Communication at 2) to determine the efficiency of the CAI at 80/80; 3) to compare the student learning achievement of the CAI based on the pretest and posttest scores ; and 4) to determine the students’ satisfaction towards the CAI. The subjects of the study were the 30 first-year undergraduate students majoring in Finance and Marketing the Faculty of Business Administration at Rajamangala University of Technology Pranakorn in 2008. The instrument and procedures comprised 4 parts. Part one contains the 8 units of CAI of Basic Thai for Business Communication each consisting of examples an end-of-unit exercise and a 5-item-end-of-unit test to measure lesson efficiency. Part two is the try-out CAI to determine its efficiency based on the results of the three respective groups which were initially 6 students majoring in Accountancy then 10 students majoring in Accountancy and finally 30 students majoring in Accountancy from the Faculty of Business Administration. The data were analyzed in percentage and mean. Part three comprises the tests consisting of the 30-item pretest and posttest containing the shuffled pretest items to compare the student achievement. The learning achievement was determined by t-test. Part four is the 10-rating scale items to survey the students’ satisfaction towards the CAI. The data were interpreted in mean score.The results indicated as follows: 1) the CAI of Basic Thai for Business Communication can be effectively complemented to teaching and learning; 2) the efficiency indication of the CAI of Basic Thai for Business Communication was higher than the set criteria 80/80 at 84.58/87.44; 3) the posttest scores were significantly higher than the pretest scores at 0.05; 4) The students were extremely satisfied with the CAI of Basic Thai for Business Communication in all aspects at Σ x 4.37.