This paper presents the design and construction of an ultrasonic scaler. The principal of Phase-Locked Loop circuit inside the IC 4046B controls the 25-kHz frequency generator with constant phase and frequency.The coil inside the hand-piece sheath produces the magnetostriction process with the magnetostrictive stack which works only at 25-kHz frequency. This proces causes the magentostrictive stack to expand and contract with high frequencies making the scaler tip to vibrate more than 20000 times per second. This dental scaler could be used to eliminate the micro-organisms in the form of plaque or tartar and dirt in the gum groove and around the tooth root surface. This tool is as effective as and cheaper than the imported equipment used by dentists. In addition the construction of an ultrasonic dental scaler helps the staff to improve their maintaining skills.

This article presents the energy conservation of the wood furniture factory in Samutprakarn province by using engineering management technique. The electrical energy of 7408000 kWh per year or 25988055 Bath per year is mainly used in the processes including a heating energy system that is derived from wood scrap. After detailed audit it was found that 8 measures have a potential to improve energy efficiency. 7 measures for electrical energy can reduce the energy of 479837.60 kWh per year and the rest decreases heating energy of 120297.15 MJ/Year or saving the scrap of 9.4 tons per year. In order to assess economic possibility all measure also were considered. The result showed that it was worth to investment. In addition specific energy consumption (SEC) can be improved from 0.57 kWh/ft3 to 0.54 kWh/ft3 or diminishing of 5.26 %

The purpose of the research was to study the art educational media design for the emotional development of mentally-retarded children. The principle of visual arts was used as a design concept. High relief pottery and painting were used as the experimental tools.The development emphasized on shape size and color learning. The results showed that the average mean of the children’s interest was at 4.02. The educational media helped improve the children’s concentration and the emotional development. Color was the easiest media to help the children’s learning. Animal shape was not too much complicated to learn. These were appropriate for mentally-disabled children

The purposes of this research are to study the customers’ satisfaction to the services at TRUE-shop in Future-Park Rangsit to compare the customers’ satisfaction to the services at TRUE-shop in Future-Park Rangsit and to collect suggestions from the customers’ satisfaction to the services at TRUE-shop in Future-Park Rangsit classified as per personal factors. The sampling groups being used in the study are 400 customers using services at TRUE-shop in Future-Park Rangsit. Information were gathered by questionnaires and data were analyzed by Statistical Value Percentile Average Standard Deviation Chi-Square Analysis for Testing Relationship and Statistical Independent Sample t-test and One Way ANOVA methods whenever significant statistical differences were encountered using LSD for testing in pairs. The result of the study showed that the customers’ satisfaction to the services at TRUE-shop in Future-Park Rangsit were at the high level in every criteria. The sampling group were satisfied firstly with the factor of process followed by the factor of marketing promotion and lastly factors of production and physical presentation. And the hypothesis testing indicated that the sampling group with different level of education showed the different level of satisfaction to the services at TRUE-shop in Future-Park Rangsit with statistical significance of 0.05

The purpose of this research is to develop learning package for an operating system course on process status for undergraduate students majoring in computer engineering. The technique of creating the cartoon story for difficult content is used to compare the process status and the steps of buying meals to enhance students’ understanding of process management. The participants are divided into two groups; the control group learning with the traditional method the experiment group learning with the learning package. The research result was that the achievement of the experimental group was higher than the control group. In addition the students were interested in learning and the students’ satisfaction is at the high level.