จำนวน Repository ( 757 )
Analysis and control of Shunt-Compensator for mitigating Unbalanced Voltages
This paper presents the analysis and the control of shunt-compensator for improving unbalanced voltages of power distribution systems in Thailand. The shunt-compensator is connected to the low voltage level in power distribution system. The analysis detail and the design of shunt-compensator obtain by using the voltage vector control (mathematical model with the stationary reference frame and synchronous reference frames). The unbalanced voltages are identified by using positive and negative sequence detection that can be shown in the synchronous reference frame. This method also presents the decoupling control including feed-forward control to compensate both positive and negative sequence component of grid voltage. The power circuit of the shunt-compensator and the distribution network are modeled by Provincial Electricity Authority (PEA) of Thailand that is the same as worldwide standard of power distribution system. By using computer program the simulation results showed the benefit and the performance of proposed methodology which obviously ensure the performance of shunt-compensator for mitigating the unbalanced voltages.
Researches for New Entrepreneur Creation : Rajamangala University of Technology Phra Nakhon - University Business Incubators
Rajamangala University of Technology Phra Nakhon has gained support from the Commission on Higher Education to set up a business incubators unit called Rajamangala University of Technology Phra Nakhon - University Business Incubators or RMUTP-UBI. The agency has a principal missihon in creating new potential entrepreneurs by utilizing results of research works inventions innovations and technology of the university. The agency๛s main aim is to get income for oneself for the university and for the country as a whole; as well as to provide information service and consultation to users both inside and outside the university. In 2007 the RMUTP-UBI had incubated 10 entrepreneurs. Among these 2 were start-up companies 3 were incubatees and 5 were pre-incubatees. It also conducted public relations visiting tours trainings setting up activity groups of students and entrepreneurs and providing academic services to meet the goal of the project.
A Comparative Study of Learning Achievement, Retention, and Preference in the Use of Game Eaching and Conventional Teaching : Industrial Technical Drawing Course
The purposes of this study were to compare the learning achievement retention and preference of students in teaching with games and the conventional teaching in reading the first-angle projection the third-angle projection isometric picture and auxiliary view according to the first-year diploma curriculum. Students were devided in to two groups: the experimental and the control group. The research instruments were the sets of games models transparencies achievement and retention test and the preference guestionnaires develop ped by the researcher The t-test was used to find the mean score difference. The findings were : 1) the learning achievement in learning with games was higher than that of the conventional teaching at .05 level of significance 2) the learning retention in teaching with games was higher than that of the traditional teaching at .05 3) the learning preference in teaching with games was higher than that of the conventional teaching at .05 level of significance.
The Development of Industrial Teachers of Rajamangala University of Technology Phra Nakhonûs Image Promotion Model
The objectives of this research were to study present and future desirable characteristics of industrial teachers. And to devolop a role model of desirable characteristics of industrial teachers who graduate from RMUTP. The sample were administrators from vocational schools vocational students and vocational student possessors. Multi-stage randomized population is categorized into three groups defining size from table of Krejcie and Morgan. The total number of population is 576. The instrument was a questionnaire for each sample. All data were analyzed to determine statistical results and presented in tubular form. A focus group meeting of 15 lectures from the Faculty of Industrial Education was organized.The study result showed that most sample from those three groups (administrators from vocational schools vocational students and Vocational student possessors) highly agreed in three aspects namely personality ethics and morality and Professional skill aspects.The focus group committee suggested improving the curriculum and also the activities whic were both curriculum activities and teaching activities of lecturers.
The Effect of Short Message Service via Mobile Telephone on Sufficient Economy Philosophy of Undergraduate Students at Rajamangala University of Technology Thanyaburi
The purposes of this research were 1) to study the effect of short message service via mobile telephone on Sufficient Economy Philosophy of undergraduate students at Rajamangala University of Technology Thanyaburi 2) to study the students’ opinions to short message service via mobile telephone on Sufficient Economy Philosophy of undergraduate student at Rajamangala University of Technology Thanyaburi. The experiment group was 30 undergraduate students at Rajamangala University of Technology Thanyaburi in Educational Technology academic year 2007. The data were analyzed by percentage mean standard deviation and t-test. The research findings were as follows: 1) It was found that the post-test score learning was statistically higher than pre-test scores at level .01. 2) It was found that the students’ opinions to short message service via mobile telephone were in a good level.