The purposes of this research is to study the level of satisfaction of Chao Phraya Express Boat s clients. Indeed this research studies behaviour of Chao Phraya Express Boat s clients and compares level of satisfaction among different genders ages marital status occupations and incomes of the clients. The results of this research indicate that the majority of the customers are females whose age between 21 - 30 years-old. They are students who are single and has income less than 10000 Baht. The result of testing our hypothesis discovers that different ages marital status occupations and incomes among various customers will have different level of satisfaction to the Chao Phraya Express Boat s service with statistically significance (p=0.05). However there is no statistical significance (p=0.05) in the result of testing the hypothesis of different genders.

The purpose of this study was to examine the perspective of M.6 students in Bangkok area and explore their media exposure knowledge and attitude to the Faculty of Mass Communication Technology of Rajamangala University of Technology Phra Nakhon. The relationship between students’ media exposure knowledge and attitude to the Faculty and the image of the Faculty was also studied. The research data was gathered through the questionnaire survey from 400 M.6 students in Bangkok area. The research result showed that: 1) The samples with different gender grade point average (GPA) household income and from different institutions had different media exposure. Those from different institutions had different knowledge about the Faculty and those with different gender and from different institutions had different attitude to the Faculty; however all samples did not have different image to the Faculty. 2) The media exposure was related to the knowledge about the Faculty. 3) The knowledge about the Faculty was related to the attitude to the Faculty. 4) The knowledge about the Faculty and the attitude to the Faculty were related to the image of the Faculty whereas Media exposure was not.

The objective of the study is to investigate the cause of double-decker accident by in-depth accident investigation method. The method could describe the critical conditions of the accident which include pre-crash during-crash and post-crash. Moreover the influencing factors of the accident can also be best explained by the method. In this study the rollover of double-decker accident is selected as a case study. The main reason is that in Thailand the double-deckers are usually used for sight-seeing purpose and there are also many reported severe accidents. In this study it is found that the factors of the accident consist of speed dimension of double-decker road condition and geometry of the accident place.

The purposes of this study were: 1. to study the inventory control system of S. Siriseang Company Limited 2. to study the causes and problems of differences between the real practical work and the company manual 3. to solve the problem of its inventory control system. The questionnaires were collected from 19 subjects relating to the inventory control system including purchasing storingaccounting and sales departments .The results showed that S. Siriseang Company Limited has 4 steps of the inventory control system consisting of Order. Products Return and Pickup. The problems of the inventory control system of S. Siriseang Company Limited are as follows; a lack of inventory data lack of purchasing planning and procurement a defective product categories issues out lack of staff and neglecting to perform the work according to the work manual. The solutions of the problems were 1. sheet items (Stock card) 2. the theory of ABC Analysis 3. the theory EOQ and 4. the process of inventory control system. The effective inventory control system should have the good management system and effective product categories for easy storage and use.

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.