Advanced Materials Research Vols. 403-408

Abstract: Fuzzy reliability analysis is regared as the theoretical basis. It takes the minimum volume and the maximum transmission efficiency as objective function．Then the mathematical model of fuzzy reliability optimal design on two stage planetary gear sets is set up. Genetic algorithm based on predatory search strategy is used to solve the fuzzy reliability mathematical model. Examples of calculation shows that the volume is decrease by 15%. The results imply the fuzzy reliability analysis is more scientific and reasonable in designing two stage planetary gear sets by using fuzzy reliability analysis.

Abstract: Defect detection in pipes is an essential task specially for sensitive applications such as oil and gas industry where special cares are required. Corrosion is a common defect in pipes which has attracted attention of researchers. In present work a non-destructive methodology for pipe corrosion monitoring is introduced. Polymer of Vinylidene Fluoride (PVDF) Piezoelectric is used as the sensor to measure strain variations affected by internal corrosion. High sensitivity and low cost of piezoelectric materials made them a good candidate for precise industrial applications. Different corrosion conditions (i.e. corrosion location along pipe and corrosion depth) are modeled and sensors voltages in different corrosion conditions are simulated. Finally in order to develop an effective corrosion detection system, an Artificial Neural Network (ANN) is designed to recognize position and amount of corrosion according to sensors voltages. The ANN performed corrosion condition recognition with 91 % of accuracy. This method provides the capability of online implementation for continuous maintenance of pipelines.

Abstract: Undoped and Mn doped ZnO films with different percentage of doping concentration (2%, 4%, 6% and 8%) were synthesized by sol gel method with an annealing temperature of 400°C. As to investigate the physical properties and microstructures, the samples are characterized using FESEM. The surface morphology images on the films showed many spherical shaped nanoparticles and separate uniformly. Meanwhile, the optical properties were characterized using UV-Vis where the transmittance and band gap value were affected by certain amount of Mn concentration. These films achieve tunable band gap characteristics by means of changing the dopant concentration. At lower concentration, 2% and 4% of Mn, the band gap is reducing compare to undoped ZnO. At higher doping for 6% and 8% of Mn, the bang gap suddenly increased.

Abstract: This paper highlights the study of the free carrier injection effect on the active SOI optical ring resonator. The effect of the free carrier injection on optical ring resonator was evaluated by varying the p+ and n+ doping concentrations. The device performances are predicted by using numerical modelling software of the 2D SILVACO and Finite Difference Time Domain method simulation software RSOFT. The results show the refractive index change increases as the p⁺ and n⁺ doping concentrations is getting higher. A shift in resonant wavelength of around 2 nm was predicted at 5x10¹⁹ cm³ p⁺ and n⁺ doping concentrations with 5.8x10^-3 refractive index change. It is also shown that 8.2dB change of the output response obtained through the output.

Abstract: According to the features of the self–rotating grinding, the real-time grinding force control system was designed. The Fuzzy-PID control method has been proved to be the most suitable control method and fulfill the system’s needs through the modeling, simulation and experiment of the system in this paper.

Abstract: Chemical mechanical polishing (hereinafter referred to as CMP) which is to provide the best global planarization technology has been researched and applied in the field of ultra-precision surface finish. This article outlines the principles of the CMP process, focusing on the development of the major theoretical models such as phenomenological model, contact mechanics model, fluid dynamics model and hybrid model based contact mechanics and fluid dynamics in chemical mechanical polishing process. The hybrid model based contact mechanics and fluid dynamics has been a good developed in recent years. The model based on the molecular / atomic scale is proposed the further research methods of CMP's theoretical model.

Abstract: The use of teleoperated robots is increasing substantially. The possibility of controlling these machines remotely in dangerous or inaccessible environments like outer space, deep water, nuclear or biologically chemically toxic environments, mines, construction sites and fires proved to be a powerful resource. However the successful requirements for telerobotics operations are still broad and imprecise. In this paper we present an analysis for a set of requirements in telerobotics operations. The approach consisted on testing some physical and psychological factors under the control of a teleoperated robot. The behavior of several human participants was recorded in real time and subsequent analyzed. The research is conducted mainly for understanding some of the factors that can map the human confidence in these kinds of scenarios. With a broad spectrum of immersive displays and network bandwidths increasing every day these requirements are becoming extremely precious for the design and implementation of telerobotics systems.

Abstract: DNA microarray analysis has become the most widely used functional genomics approach in the bioinformatics field. Biologists are vastly plagued by the enormous amount of unprecedented qualities of genome-wide data produced by the DNA Microarray experiment.Clustering is the process of grouping data objects into set of disjoint classes called clusters so that objects within a class are highly similar with one another and dissimilar with the objects in other classes. It is presently the far most used method for gene expression analysis which provides a divide-and–conquer strategy to extract meaningful information from expression profile.In transcriptomics,clustering is used to build groups of genes with related expression patterns (also known as coexpressed genes). Often such groups contain functionally related proteins, such as enzymes for a specific pathway, or genes that are co-regulated. This paper presents a review on the recently development of microarray clustering techniques followed by the different categories of gene expression data clustering.

Abstract: In the near future Data Bank Users will be made of wide range of people and its applications will be much more diverse and more widespread. These users must be provided with a much higher level of abstraction compared to the current data models. Data modeling should be much simpler so that the end users can fulfill their information needs or apply the changes without needing experts and only with a concise training. The current data models are not suitable for the unskilled users. The first three initial parts will provide brief and comparative description of these data models and advantages and disadvantages of them. In the fourth part, the structure of Gravitational Data Model (which is made of bilateral connections between each entity and its dependents and also the other entities) and its pros and cons will be presented.

Abstract: Presently, computers have become a part of everyone’s daily life, including the visually impaired people. Keyboard, being the only input device for using a computer, is not friendly for the visually impaired. The computer skills of these people go unutilized since they find it difficult to work using the standard keyboard. Several companies today market alternative keyboards for helping the visually impaired to type, yet they are not suitable for them. Thus, the technical aim of this paper describes an innovative idea for eliminating the above said issue by using the existing QWERTY keyboard to enhance the interaction of the visually impaired people with standard computers thereby eliminating all of the practical and mental constraints.