The aim of this research is to study the varieties of weight density distribution affect to the center of mass and vehicle stability. The weight density distribution tester was designed and changed the position of mass. Base on the center of mass is main points of vehicle stability. On the other hand FMCSA standard was applied to field test for considering of the brake performance and vehicle stability. The results of research discovered to the mass distribution on longitudinal plane are affected to the center of mass and absolutely influence at the right wheel on the front axle. In term of the braking performance it’s depends on the lateral mass distribution especially the center position of mass installed on longitudinal and horizontal plane and close up on the front axle (Y2). For the vehicle stability results the position (Y2) is the highest influence for yaw rate and sideslip. Otherwise the position (Y3) or the position of mass installed on longitudinal plane and nearly at the left wheel on the rear axle. Additionally wheel lock-up condition was appeared on the front axle only. Because the behavior of weight distribution on the front axle was decreased lead to mass distribution on longitudinal plane.

The aim of this research is to study the brake proportional affected to vehicle stability. Braking performance and vehicle stability testing are the main of research purposes. Otherwise learning research center and new researcher in automotive engineering are the minor research objectives. The results of research discovered to the braking performance depend on driver behavior. By the minimum deceleration was appeared on the non-proportion in front axle with braking ratio 0:100. In term of vehicle stabilities yaw and pitch moment are normally occur by the driving behavior. But the sideslip is an absolutely effect to vehicle handling. With the braking ratio 100:0 there is the highest risk for controlling a vehicle cause of the wheels were locked-up condition in the rear axle. Therefore the value of the sideslip was exceeded with the criteria. Furthermore these project researches were got the learning research center and the new researcher in automotive engineering field.

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 Purposes of this research were to 1) study the impact on the motivation of the personnel. 2) To study the satisfaction that affect the motivation of the personnel. 3) Study on ways to enhance motivation in the operation of personnel. The survey sample size was 285 persons. Sampling Data were collected by questionnaire data and analyzed with Average Standard Deviation Interpretation of descriptive analysis. All of three topics the results showed in a moderate level. Suggestion about motivation of employees. First the board of directors should have obligingness with employees. Second also boost workers morale equally. Last the incentive approach is very satisfying with the universitys policy to encourage all personnel to make concrete progress in the profession.

The purposes of the experimental project were to modify (FBSF) to compare plastic media form Small Pall Ring Bio-media Filter are commercially available. The model of FBSF consists of Equalization tank (EQ) Aeration tank with . The corresponding with Hydraulic Retention Time (HRT) 48 hrs. The factors used in the study are the essential parameter such as BOD COD SS TDS and changes in the Physical Characteristics of wastewater. polypropylene as a supporting media for Fixed Bed Submerged Filter polypropylene media 2 tanks Aeration tank with plastic media 2 tanks and Effluent tank The result experimental indicated that efficiencies of FBSF with 92.78% 75.90% 96.75% and 20.76%0 respectively gave the higher effluent values that the plastic media the efficiencies 84.20% 61.66% 94.12% and 14.80% 0. The effluent BODwas less than 20 mg/l. The was on clear less sediment no foul odor. The . polypropylene media in term of BOD COD SS and TDS removal of FBSF with of BOD COD SS and TDS removal of respectivelywastewater Fixed Bed Submerged Filter was effectively for the community household wastewater5 Rajamangala University of Teehnology Phra Nakhon