This research aimed to study the influence of P/E ratio and market capitalization on returns of the securities in the energy sector in the Stock Exchange of Thailand. In this research the researcher has studied and collected data from the closing prices of the securities in energy sector that are currently traded in the Stock Exchange of Thailand. From January 2015 to December 2019 from the Stock Exchange of Thailand 15 companies and used descriptive analysis mean and standard deviation to test the relationship between independent variables by using correlation analysis and multiple regression analysis to determine the influence of P/E ratio and market capitalization on returns of the securities in the energy sector. The results of the research showed that the P/E ratio had a significant positive influence on returns of the energy securities in the Stock Exchange of Thailand. The market capitalization factor also found that it had no influence on returns of the energy securities in the Stock Exchange of Thailand.

Normally the request to swap a working period and the request to work overtime procedure are action with lots of papers. Furthermore both procedures need approval from a manager who worked in the field outside the company. Therefore the developer proposed the Overtime Duration Computed System with Time Attendance Changing Function. This system operated by working based on a web application that can facilitate for submitting the request and the approval via the internet. After the system testing the Overtime Duration Computed System with Time Attendance Changing Function can support and also reduce the duration time for the request and the approval procedure for both employee and manager.

The purpose of the Environment Control System for radish with Internet of Things project is to control the environment of radish cultivation in a planting house. The working process of this project is separated into two parts. The first part hardware control is to control temperature moisture and illustrated the working status on LCD. The second part software control is collected data from all sensors and then published results on the website via MQTT protocol. The Environment Control System for radish with Internet of Things project is evaluated by measuring the value of temperature and soil moisture from the system compare with the value from reliable instruments. The test results show that the system can measure the temperature and soil moisture correctly. Moreover the software function of the system has fulfilled the requirements.

The purpose of the research is to devise and implement for testing the ability to absorb energy from vibration. The results are obtained from simulating the operating status of small machines. In order to get the mechanical force from the vibrating of the machine by using piezoelectric materials (PZT) It was found that the size of the piezoelectric materials used in each condition affected the energy absorption. There are variables interested in different diameters at 27 and 35 millimeters. The result shows that the dielectric displacement is directly proportional to the force used but is inversely proportional to the size of the cross-sectional area of the piezoelectric material. In addition the ability to absorb energy in one second is 4.51 volts and has a maximum energy of 7.4 x10 -8joules.

This research was study the optimum condition for chitosan film forming from preparing the chitosan solution 2% (w/w) that added with acetic acid 1% (w/w). The solution viscosity was adjusted by glycerol at 15 30 and 45 % (w/w) and Tween 10% (w/w). From the experimental results in case of the chitosan solution that adding with glycerol 45 % (w/w) Tween 10% (w/w) and drying which final moisture content at 23 % (d.b.) affected the highest viscosity of the chitosan film that compared with other condition. The ultimate tensile strength of chitosan film was 4.14 MPa. For banana storage testing the banana was wrapped with chitosan film for 10 days at room temperature the first five days the color of banana peel was yellow normally after that the peel was slightly increased with dark color. The total soluble solid of the banana was in the range of 19-28 Brix.