Advanced Materials Research Vols. 424-425

Abstract: This paper mainly quantifies the safety effects of ramp spacing, and other geometric design elements of highway facilities. Negative Binomial (NB) regression models have been applied to estimate of different accident types, including total crashes, fatal-plus-injury crashes, single-vehicle crashes and multiple-vehicle crashes. Data for model estimation was collected in 112 freeway segments where each entrance ramp is followed by an exit ramp on I-5 in the Washington State, US. Three years (2005-2007) of freeway crashes has been examined by the NB model. The modeling results have been geared into the development of accident modification factors (AMFs) for ramp spacing that can be used safety prediction of freeways. Furthermore, the results also suggest some geometric designs are recommended to improve freeway safety

Abstract: Three cyclic waterflooding programs were designed to compare with the original program of block Bao14 according to the characteristics with residual oil. The results showed that the recovery percentage of three designs increased in different level. The fourth design was best. The stage cumulative incremental oil production was 16.07×104t and recovery ratio improved 2.14% than that of original design

Abstract: This paper focuses on the fusion method of visible image and infrared image, making in-depth discussion on the existing algorithms and proposes a novel method on the fusion rules. The image is firstly decomposed into low-frequency and high-frequency coefficients by NSCT and the characteristics of visible image and infrared image are then taken into account to finish the fusion. Finally, the quality of the fused image by different algorithms is compared with several existing criterions. MATLAB is employed to finish the simulation and the results will demonstrate this algorithm can improve the quality of the fused image effectively and the features in the image won’t be missing

Abstract: Cluster-based storage systems are widely used by many large data centers because of the manageability, low cost and other advantages. However, typical cluster-based storage systems rely on the standard TCP/IP Ethernet for clients to access data. Clients would experience the TCP effective throughput (called goodput) collapse which is termed as Incast problem. The main reason of Incast is TCP retransmit timeout which is caused by unfairness between the competing flows. In this paper, we analyze the TCP Incast dynamics from the fairness aspect and propose a method to make the competing flows share the network resource fairly by throttling the traffic. The simulation results show that our method is able to improve the TCP Incast goodput by 10% comparing to the high-timer-resolution

Abstract: Gas monitoring is considered as the most important mean in the safe production of coalmine. Time delay inevitably exists in the current gas monitoring technology widely used today. This research uses Support vector machine to forecast gas concentration. ZigBee wireless network protocol is adopted so that a wireless gas monitoring network with concentration predicting function is obtained. In this way the present time delay in Gas concentration monitoring will be improved and the scope of monitoring will be expanded at the same time

Abstract: This paper presents the communi-cation system of wheelchair robot which is based on CAN (Controller Area Network) bus and made up of PC/104PC, MCU and DSP system, which is distributed communication architecture. In this structure, the PC/104, as upper control computer, achieves communi-cation with the underlying control system MCU (DSP) through the CANopen protocol. At the same time, corresponding communication softwares are designed. Finally, the above-mentioned communication softwares are implemented by the wheelchair robot.

Abstract: The effective elastic modulus of hydroxyaptite (HA) microspheres composite scaffold is determined by the HA microspheres’ elastic modulus, accumulation topology model and the porosity. Experiments showed that different accumulation pattern and porosity has different modulus for bone scaffold. Furthermore, porosity and accumulation pattern are affected directly by the adhesive thickness. Here, we elucidate the effect of the scaffold parameters on bone sitffness and porostiy by means of a mathmatically based approach. Based on ANSYS simulation platform, the effective elastic modulus of HA microspheres scaffold was demonstrated. And the effective elastic modulus of artificial bone scaffold with different adhesive thickness was calculated by using APDL. Use the void fraction to illustrate the porosity of HA microspheres scaffold, which is an important consideration when attempting to evaluate the potential volume of water and hydrocarbons it may contain. By analysis of the optimization results, the effective elastic modulus reaches the maximum when the adhesive layer thickness is 0.05 mm, while the corresponding porosity is 0.5231

Abstract: Protein folding problem is one of the most important problems in bioinformatics. By combining simulated annealing method with pull moves which is a local move set and conformation update mechanism, we put forward an improved simulated annealing (ISA) algorithm for the two-dimensional hydrophobic- polar (2D HP) protein folding problem. Numerical results show that the ISA algorithm can find the known lowest-energy ground state more rapidly and efficiently than the genetic algorithm (GA) for the several given HP sequences. For the sequence with length 20, we obtain the lower-energy conformation than GA. The performance of the algorithm show ISA is an effective method for protein folding simulation

Abstract: This paper extends our early study on discrete events system formulations of DNA hybridization, and focuses discussions on metabolism and gene mutation in Molecular Biology. Finite state machine (FSM) theory is extensively applied to represent key concepts and analyze the processes related to the biological phenomena mentioned above. The goal is to mathematically represent and interpret the process of metabolism and the effects to structures of protein macro molecule caused by gene mutation. We hope the proposed model will provide a foothold for introducing the information science and the control theory tools in Molecular Biology

Abstract: Based on the geometric characteristics of five typical cylindrical shell structures, a method of the node generation and element connection of the reticulated shell is established in the cylindrical coordinate system. A macro program is designed by using its own Parametric Design Language APDL (ANSYS Parametric Design Language) based on the platform of ANSYS. This five typical cylindrical shell modeling are realized under given parametric conditions such as span, rise high, length and number of grids. It is proved by several examples that this method is simple, efficient and possible. It can be easily used to analysis the internal force and optimize design in shell structures