Advanced Materials Research Vols. 1025-1026

Abstract: On the basis of research on energy dissipation scheme of Changheba hydropower station in model tests, the chaotic characteristics of the fluctuating pressure in the slit-type contraction section were studied with the employment of chaotic theory. According to Takens’ embedding theorem, we performed a phase space reconstruction on the measured fluctuating series, where the optimal delay time was determined with the average mutual information (AMI) method, the optimal embedding dimension was determined with the averaged false nearest neighbor (AFN) method. Calculated from the testing results, the optimal delay time was ranging from 7 to 10 while the optimal embedding dimension was ranging from 12 to 14. With the optimal embedding parameters obtained, the correlation dimension D₂ and the largest Lyaponov exponent λ₁ was calculated, with the obtained D₂ varying from 7.626 to 8.821 and λ₁ varying from 0.091 to 0.302. Conclusively, the flow characteristics on the floor were more complex than those on the sidewall, while the flow structure exhibited no essential difference. Moreover, the distribution law of correlation dimension indicated that the effects of contraction on the flow around the floor were more remarkable; however, the calculated largest Lyapunov exponent could only be served as a qualitative indicator of a chaotic system, without any instruction to the degree of chaos.

Abstract: The purpose of this study is to propose a method of environment assessment in the field of building materials within Korea Green Building Certification (G-SEED). The method of environment assessment in the field of building materials was examined using LEED of the United States and BREEAM of the United Kingdom, the representative environment-friendly building certification systems in other countries. Especially, each revision of BREEAM was investigated for assessment methods such as environment assessment guidelines and assessment programs. In addition, assessment process and items were analyzed in relation to BREEAM. As a result, for environment assessment in the field of building materials within G-SEED, the method of connecting essential elements such as building material assessment guidelines and database networks with G-SEED was proposed.

Abstract: MicroElectroMechanical Systems (MEMS) are devices what have been considered the technology of the future, being used in too many areas. MEMS are a combination of microstructures, micro sensors and micro actuators. The purpose of this work is to reduce the chaotic movement of the micro-actuator electrostatic to a small periodic orbit using the linear optimal control technique. The simulation results show that this technical is very effective.

Abstract: Reverse engineering and spatial digitization became more popular recently. The popularity grows with the devices which are capable to scan the human figures, cars, parts of the buildings or even bigger objects in a single process. In general, scanning devices sometimes present disproportionate costs as the usual additional software often tops the half of the hardware price. Text of this paper is focused on the alternative device which can use very affordable software applications to generate the same results as the most expensive scanning equipment. Particular parts of this article briefly describe the principles of non-contact three dimensional scanning using the Kinect device, the process of data processing in alternative software applications and possibilities of their further utilization.