This paper presents a mathematical modelling for design the control system of a liquid. The system are consists of one and two tanks of a liquid. To confirm the achieved mathematical modelling is used to design P PI PD and PID controller in the frequency domain. The experimental results are indicated as the following. An one tank of a liquid controlling The controller can be control the liquid level to set point with in 100s. In the case of a disturbance occurs in the system it is perform by drain a liquid. As same as the controller it can be control the liquid level into the steady state. In the part of the liquid control this is the interaction between two tanks. The experimental results of the system operation the controller can be control the liquid into the set point both occur disturbance and without disturbance respectively

The purposes of this research were 1) to study problems and needs of designing packages for mixing mangosteen extract soap for the Faculty of Science and Technology Rajamangala University of Technology Thanyaburi 2) to design and develop packages for mixing mangosteen extract soap and 3) to assess the satisfactions towards the packages from manufacturers consumers and packaging experts. The samples consisted of 235 people. A structured interview and questionnaire were used to collect the data which was then analyzed using percentile values means and standard division. The result showed that since there had not been packages for this mixing mangosteen extract soap to be sold in the market four patterns of packages were designed and construced for three products. The three products were 1) 80 grams of mixing mangosteen extract soap 2) 100 ml. of facial cream mixed with mangosteen extract and 3) 400 ml. of mixing mangosteen extract liquid soap. The second pattern was rated a high level of satisfaction by the target group.

This research aimed to study and analyse conditions and problems in designing and developing household and decorative products of One Tambon One Product (OTOP) small and medium enterprises (SMEs) in Pathumthani province. The informants were 4 OTOP entrepreneurs and 205 OTOP SMEs. The research was conducted by means of interviews observations and questionnaires. The data was statistically analysed using frequency percentages mean and standard deviation. The results showed that conditions and problems in designing and developing household and decorative OTOP products ranged from home-based production site a lack of knowledge in product design and development transportation creativity artistic relations product specifications marketing to product design and development laws. Four entrepreneurs from these groups of products: lotus-fiber flowers silk flowers and bamboo lamps were found to have the problem of dyeing materials whilst those from the group of Thai/Japanese clay flowers had the problem of clay. The researcher had analysed piloted and concluded the problems and then passed on product development techniques to the entrepreneurs. It was found that they could use the given knowledge to make beautiful products and they satisfied with the reducing cost of production.

The objective of the research was to identify the optimized thread tensile values for the setup of Model D – We 1218-55 computerized 18-needles sewing machine in order to minimize a number of times the machine halts. The cause of the sewing machine halting which reduced the efficiencies of the machine was found to be torn threads. In order to maximize the efficiencies the experimental design technique was utilized to find the optimal values for five types of cloth: polo tc-cool cotton jacket and shirt. The method involved three nested designs which are the type of thread number of sewing layers and thread-hole size. The three thread tensile levels experimented were low (2 oz.) medium (5 oz.) and high (8 oz.) and the response was the number of times the machine halted in the span of 30 minutes. The ANOVA (Analysis of Variance) used for the experimental design showed that the three factors significantly affected the machine’s halt. The number of times the machine halted was used to create Surface Plot with polynomial trend-lines and the quadratic equation was applied to determine the optimal value for each type of thread number of sewing layers and thread-hole size. The values obtained were then set for another experiment the results of which were that the sewing machine halted less frequently and the efficiencies thus increased about by 77.01%.

This paper presents a design of the control system to control AC/DC converter. Algorithm of a control system design consists of the output voltage loop control used a fuzzy gain scheduling of PI control and the current loop control used a hysteresis control which is described in this paper. The evaluation of the proposed control system is used to control an isolated CUK AC/DC converter operation with a 250W load and a -48V output voltage. The system is achieved as the following; the tight output voltage both the steady state operation and the transient response a power factor is nearly unity and the waveform of input current is nearly sinusoidal. In addition the control system design is simple and uncomplicated