This research is aimed to establish the small wireless sensor network under the real environment. The objectives this research is aimed to study the data transmission and evaluate the data transmission performance of RPL protocol in wireless sensor network. Four nodes of wireless sensor network have been installation and transmissions between nodes in single-hop and multi-hop have been simulation for testing and analyzing data from the network following the transmission performance index. The research found that the number of hop and building environment are the principle factor to the performance of RPL protocol this might be the major limit to implement the RPL protocol in wireless sensor network

The objectives of this study were to calculate the probability of type I error power of a test and to compare the performance of three test statistics: Z Student’s t and Welch’s t. Including the recommending the appropriate test statistic. Classification of the population according to five distribution. The ratios of mean group 1 per group 2 were three levels. The ratios of variance group 1 per group 2 were three levels. The sample sizes of two populations were nine sizes. The significance levels that to study were 0.01 and 0.05. The data were simulated by using SAS programming with 1000 replicates. Results of the research were Z test statistic could control the probability of type I error and had higher power of a test than other test statistics but this test is necessary to know the variances of the two groups. Therefore it was appropriate to apply the other test statistics i.e. Student’s t or Welch’s t. If the variances of the two groups were equal Student’s t was a more appropriate test statistic than Welch’s t. But if the variances of the two groups were not equal Welch’s t was a more appropriate. When both sample sizes were large and the population variances were equal we could use any tests since there is no difference in the performance.

The purposes of the case study on relationship of good governance and work efficiency of operational personnel at National Food Institute were to study 1) the perception of good governance in the workplace 2) the level of perceived work performance and 3) the relationship between good governance perception in working and work performance perception of 153 operational personnel at National Food Institute. The research instrument used in the study were questionnaire yielding data processed and analyzed by statistics including frequency percentage mean (μ) and standard deviation (σ). The research revealed that 1. The level of perceived good governance in the workplace of National Food Institute personnel in the overall picture was especially high showing moral aspect responsibility aspect transparency aspect worthiness aspect engagement aspect and rule of law aspect respectively. 2. Performance perception level of National Food Institute operational personnel in the overall picture was especially high resulting in quality of work initiative or creative knowledge about the job respectively. 3. The results of hypothesis testing revealed that the level of perceived good governance was positively and highly related with the performance level of National Food Institute operational personnel in the overall (ρ = .702) statistically significant at 0.01 level. Perceived performance in each aspect was positively related to perceived overall work effectiveness revealing average relationship between worthiness aspect engagement aspect responsibility aspect transparency aspect under average relationship between moral aspect and very low relationship between rules of law aspect. The research recommends that National Food Institute should promote the recognition of good governance especially with the emphasis on the rule of law which deals with regulations orders for it is very imperative. Trainings for example should be regularly held to create the personnel’s awareness thorough understanding and true awareness toward good governance for this will positively affect the personnel’s work performance accordingly.

The first purpose of this research is to study the using of personnel management system of Rajamagala University of Technology Phranakhon. Secondly the satisfaction in system using is suggested. The investigation and gathering information from university workers are done by questionnaire of satisfaction. The information is evaluated by using frequency percentage mean and standard deviation term. The reliability of two samples is tested by t-test using Alpha Coefficient of Cronbach and the reliability of more than two samples is tested by One Way Analysis of Variance. The results showed that the efficiency of using the personnel management system is the same as the system which is used in division of personnel management administration and division of general administration. The setting manual and log out of system which used in sub-system of each role are consistent with research hypothesis. The analysis of satisfaction of all workers between sexes (male and female) and between duties (support and academic staff) showed that the satisfaction in personnel management system is at high level. The university plan to develop the system continuously to face the changing and the present.

Research presents the design and construction of a prototype device alert to clean the solar panels. The measure monitoring of dust and blocking dirt surface of solar panel causes generation Energy low efficiency the devices are alerted to clean solar panel to ensure generation Energy highest efficiency and reduce the cost of solar cell cleaning which will be done 12 times a year. Researchers have introduced electrical and electronic technology with solar panels to provide a reference. Take an installed prototype in process with solar panel energy factory. After that clean the panel referred to the morning every day. This prototype will be processing performance comparison between the solar panels reference with the solar panels factory every day and results via the Internet and record the data in memory. The results of this research found that. Efficiency of electricity production is down 9% as 3 months and 10.47% of the year due to impurities. Dust cover doing have been cleaned twice the efficiency of the electricity production has remained high. This will alert you that washing does not have to be done 12 times as practiced in a solar farm reducing costs 10 times a year.