The objective of this research is to develop a small and low-cost weather station. The station will be wireless transmit and receive data via radio signals. The 45mW solar cell will be used as a solar irradiance sensor which is very expensive for the weather station and the PIC18F97J60 controller will control the transmitter and receiver system. Moreover the author has developed the weather monitoring software by using LabVIEW. After testing the measurement percentage errors with the reference weather station the results showed that the relative humidity measurement error is equal to 3.106% the temperature measurement error is equal to 0.685% the wind speed is about 4.527% the wind direction measurement error is equal to 5.236% and the solar irradiance measurement error is equal to 0.501%. The longest working distance between the weather sensor and receiver unit is equal to 145 meters.

Nowadays Eye Tracking Technology is one main challenge for developers of new human-computer interface. This technology provides a more natural way of interacting with a computer system by user’s eye. Now commercially available systems exist; however they are not widely used because of expensiveness. This paper describes a tutorial that shows step by step how to build a low-cost eye tracker using eyeglass setup. The glasses are designed to work with video-oculography technique (VOG) in the infrared spectrum. The key features of the eye is a center of the pupil. The gaze point of users are estimated based on order polynomial regression (linear quadratic and cubic). This research conducted an experiment with 30 participants tested eye-gaze calibration. Consequently the experimental results showed that eye-gaze can be estimated in real-time while the cubic function can be accurate eye-gaze position more than the other function.

A comparative study. The purpose was to study the costs and the cost of return. Comparative analysis of the difference between revenue and the cost of return breakeven Between brackish and salt water fish white snapper. This study used data from interviews with of 24 cases. The period 6% of Interest rate of study 5-year. - A study of the brackish cost per acre was 355127.00 baht Salt water 31556.34 baht cost was 850784.15 baht Salt water 788305.00 baht Income yield 1914250.00 baht. and Salt water 1908750.00 baht. the cost according to the net present value (NPV) were positive value equal 620881.68 baht Salt water 628974.65 baht and the internal rate of return (IRR) 16.95% Salt water 17.45 % with a payback period of 1 year 9 months 6 days Salt water 1year 8 months 4 days and the breakeven point is equal to 96529.25 baht Salt water 86643.80 Baht. - The salt water yield worthwhile than brackish water.

Electronic load is an importance part of power supplies testing system. For non-electronic load type it is required to replace a resister with a new one leading to complicated working procedure. The modern power electronic technology is employ to solve this problem. The electronic load can vary the value following user command. Imported electronic load is costly leading Thailand to have a balance of trade deficit. This article proposes design and implement of an economical cost 30V 1 k DC-Electronic Load controlled by Microcontroller. The tested results can confirm the validity of this proposed electronic load

The objective of this study was investigate the optimal formulation of Homemade dairy yogurt that 100 percent of dairy milk ratio of dairy milk to skim milk powder and milk powder was 90:10 85:15 and 80:20 respectively as compared to the control (commercial-yogurt Dutch mill). The Yogurt mixeds were heated to 85 C and held for 5 min incubated at 43 C until the pH reached 4.3. The mixes were then stored at 4 C. Yogurt were prepared from higher ratio of dairy milk : skim milk powder and milk powder led to the more time of incubation. The 31 participated sensory evaluation of the sample. From the result choosed first three formulas to analysed in chemical characteristic and bacterial chariacteristic. Total solid of yogurt were prepare from 90:10 and 85:15 of dairy milk : milk powder ratio were not different with control (p>0.05). Total cell count was found to range between 8.08 – 8.50 LogCFU/g and Lactic acid bacteria was found to range between 6.71 – 8.88 LogCFU/g. The optimum formula of homemade dairy yogurt that ratio of dairy milk to milk powder was 90 : 10 and cost per unit (140 g.) was 10.51 Baht compare with control was 14 Baht.