The purpose of this research is to study the construction safety system for working at height. The safety system for working at height in this research is predetermined by department of labour protection and welfare and safety and health at work promotion association (Thailand). The safety system composed of (1) safety policy (2) safety organization (3) prevention measure (4) risk analysis (5) training (6) safety inspection (7) accident report and (8) emergency planning. Since they had been used construction safety system for working at height in construction site. They have seen different number reduced from accident on site project. However the cost of construction project would have increases.For example building construction site project would taking more time to finished their project. Such as project A have costs increase 281385 baht Project B have costs increase 263648 baht and Project C have costs increase more 285413 bahtRespectively.

Currently transport has played an important role in everyday life resulting in huge traffic jams caused by big city streets and pollution problems from global warming to global temperatures are rising. Since humans are creatures that prefer comfort in all areas which contrasts with the higher temperatures of the Earth. Currently the use of air conditioning a lot. To modify the temperature is reduced in the range 2 3 to 25 degrees Celsius makes people feel comfortable. However the use of air conditioning in the car cabin cooling efficiency can be increased to a higher level than it is by cooling the refrigerant. The aim of this research is to test and compare the performance of car air conditioning systems usually equipped with a heat exchanger. Using water from the condensation of evaporator as a medium for heat transfer. By installing the equipment at the outlet of the condenser. This causes the temperature of the refrigerant is low. The pipe lengths in the equipment from the calculation of 1 .2 meters and copper lines that increases the length of the tubes was calculated to compare with a length of 1.6 meters to test the speed of the compressor 1000 1500 2000 and. 2500 rpm and a wind speed of 20 35 and 50 kilometers per hour. The results of experiment found that the temperature refrigerant equipment decreased from an average of 1.6 degrees Celsius the pipe length of 1.2 meters and 1.6 meters of pipe temperature drops 1.8 degrees average temperature attended Eva sufficiently reduced operator. It increases energy efficiency ratio averaged 6.68% of the pipe length 1.2 m and 22.24% at a length of 1.6 meters as well as to increase the coefficient of performance of the air conditioning system. 6 .6 9 % of the pipe length of 1.2 meters and a length of 1.6 meters at 22.4% with the key factor in optimizing the cars air conditioning system. Making the refrigerant from the condenser the temperature drops to pull heat out of the cabin through evaporator higher.

This research aimed to study Thai and foreign tourists about development guidelines of historical tourist attraction. 400 Thai and foreign tourists who came to travel at Ayutthaya Historical Park Ayutthaya province. A questionnaire was used as a research instrument. The statistics used for analyzing data were percentage mean and standard deviation. The results revealed that most the tourists were female ages 31 – 40 years old. Their education backgrounds were Bachelor’s degree. Their occupations were private companies. Their were Thai and Foreign. In general The Development Guidelines of Historical Tourist Attractions. The first of development guidelines were Attractive Factors (To what extent does each of the followings attract tourist?) and next were The capabilities to support tourism (To what extent does each of the followings support tourism?) and Management and Administration (To what extent does each of the followings affect tourism?). The top 5 of development guidelines were The remarkable and unique history Architectural and artistic beauty Greatness a good image and recognition Enough accommodations and Convenient access to tourist destinations

The topic of this research is the study of the changes of tourism maket in Thailand that has an effect on the tourists behavior. The problem concerns the decision making of tourists the information accessibility and the attitude of tourists the expectation and the satisfaction concerning Medical tourism. This qualitative research explained the tourists attitude and the creation of competitive advantage from customers perspectives as tourist in the medical tourism business. In the depth-interview of tourists the decision making process the expectation and satisfaction of customers in medical tourism were explained and measured based on the understanding of customer and the pre/post experience of the medical tourism service. The objectives of this research were to create the service repurchasing Internet information sharing and the media accessibility for tourists and perspective who would like to travel in Thailand and other related topics concerning medical tourism in Thailand. In conclusion the group of author argues that the information accessibility in this medical tourism to local and global tourists are limited and the business owners and others should play important role to effectively present the idea and concept of the medical tourism to the prospects and the existing customers in order to generate more income and gain more distribution channels. Finally the group of author identify the creation of the competitive advantage of medical tourism by reacting to the customers requests and requirements and also the information providing and accessibility throughout the media channels. Moreover creating the brand image and cooperating with government for the medical tourism theme under the government support in thecurrent national development plan would make substantially different from the existing situation for all of the players in this market.

This thesis presents an assessment of voltage sags when faults are happened in the 115 kV transmission line of the Provincial Electricity Authority (PEA) when distributed generation (DG) is installed in the system. The computer program PSCAD/EMTDC (Power Systems Computer Aided Design / Electromagnetic Transient in DC system) version 4.2 is applied to provide electrical parameters for the modeling and simulation and to analyze the fault occurred which resulted in voltage sag. Test results from PSCAD/EMTDC show the values of voltage sag when 5 types of fault are occurred (Single Line to Ground Fault Double Line to Ground Fault Three Phase to Ground Fault Line to Fault and Three Phase Fault). For all cases the value of root mean square voltage before fault is 100% or 1.0 pu. It can be seen that for both radial line and closed circuit when DG are installed in the system the value of phase to ground RMS residual voltage and phase to phase RMS residual voltage at the bus of Bang-pa-in 2 substation are more than the values in case of the system without DG.