Advanced Materials Research Vols. 403-408

Abstract: ARL (Average Run Length) is used as a tool to measure the performance of control chart. But it isn’t very accurate. In this paper, APL (Average Product Length) is used as a criterion of multivariate control chart performance assessment and a multivariate chart with adaptive sample size is proposed. A Markov chain method is proposed to calculate the APL of multivariate chart with adaptive sample size and then the optimization design method of this chart is discussed. By comparing with traditional fixed sample size design method, we can find that this method have higher efficiency.

Abstract: For the purpose of solving product variant search and retrieval problems for non-professional customers, a search and retrieval framework is proposed based on the semantically annotated product family using multi-facet domain ontology. The method of developing multi-faceted domain ontology is discussed, and the annotation model is constructed，then the methodology of search and retrieval is presented in detail. Finally, an example of a digital camera family is employed to illustrate the proposed approach.

Abstract: Radio broadcasting technology has evolved rapidly over the last few years due to ever increasing demands for as high quality sound services with ancillary data transmission in mobile environment. The Eureka-147 Digital Audio Broadcasting (DAB) system with coded OFDM technology accomplish this demand by making receivers highly robust against effects of multipath fading environment. In this paper, we have analyzed the performance of DAB system conforming to the parameters established by the ETSI (EN 300 401) using frequency interleaving and different coding rates in different transmission channels. The results show that interleaving is essential for the forward error correction to work properly and an increased coding rate makes the system more flexible without increase in the receiver complexity.

Abstract: Acoustic emission is an effective damage assessment method in a structure subjected to mechanical loading. Calculation of log-linear slope of the frequency-magnitude distribution of acoustic emission (known as b-value) has been carried out. It is found that the b-valuefor the log frequency-magnitude graph has a good correlation for beam imposed of stepwise loading.It also can be seen that the b-value is decreased as the load increased.

Abstract: Suitable applications of smart structures for multifunctional spaces are going to be found by this paper. Logical argumentation research method is applied to identify a special smart structure which its features match to architectural requirements of multifunctional spaces. Hence, the smartness of architectural structures has two distinct scales: nanoscale and real scale, the application of these structures is based on two scales. Nanoscale smart structures have the capabilities which differ from real-scale smart structures. The analysis of features of multifunctional spaces shows that these kinds of spaces require structures which are smart both in nanoscale and real scale. As a result, combined-scale smart structures are recommended for multifunctional spaces.

Abstract: A novel tunable RF-MEMS variable capacitor(varactor) is presented. The Flip -Flop structure of the design makes it possible to either increase or decrease the capacitance. Dimensions, sizes and the materials used in the device are chosen so that it can be manufactured in Urmia MEMS Lab. Silicon surface micromachining thechnology is used for the structure, which is CMOS compatible. Electrostatic actuation method is selected because of it's low power consumption so it can be used in low-power wireless applications. The value of the capacitor is changed by varying the gap between the two plates. Tuning voltage is in the range of 0-2 volts. The capacitor has the initial value of 0.43pF, maximum value of 0.92pF and minimum value of 0.3pF. Actuation and varactor plates are separate from each other. The structure is simple and can be fabricated by employing only 3 masks.

Abstract: A new varying section cantilever beam type RF MEMS switch has been proposed. The main advantage of this switch is that it is inherently stiction free and therefore enhances design flexibility. An analytical model developed using unit load approach for the spring constant of the proposed switch has been presented and it has been shown that the spring constant and therefore the pull in voltage (Vpi) can be considerably reduced with the proposed switch. Simulation studies conducted on two groups of devices clearly demonstrate that the pull in voltage can be reduced by 26% with ten sections. Comparision of the pull in voltage obtained in the simulation studies for devices with the theoretically estimated Vpi shows that the spring constant model presented in this paper accurately estimates the spring constant. The results of analytical studies also demonstrate that the new proposed cantilever beam can considerably reduce the pull in voltage.

Abstract: This paper presents a tunable inductor using MEMS technology .This tunable spiral inductor is designed in order to be used in RF circuits such as : controlled oscillators with voltage (VCO) , matching networks ,amplifiers etc . The electrostatic method is employed for tuning the inductor by the movement of cantilever beam downward and changing the value of magnetic flux. Value of inductance varies fram 1.15nh to 0.561 nh .therefore ,tunablity of 66.21% was achieved .Maximum quality factor in the above inductor was achieved az 13.88 in the frequency 0f 12 GHz and the value of resonance frequency was achieved as 19.5 GHz

Abstract: In this paper, simulation solution for Microelectromechanical systems (MEMS) based capacitive differential pressure sensor for aircraft altimeter is proposed. The principle of proposed MEMS capacitive differential pressure sensor design was explained. Analysis for the measurement of center deflection and capacitive sensitivity square diaphragm membrane was done. Simulation on deflection and capacitive sensitivity was carried out for the range of pressure from 100mbar to1100mbar. Gold, diaphragm membrane was used in this analysis. Analysis result shows, linear variation on center deflection and capacitance variation which is more suitable for this application.

Abstract: 3-D Imaging refers to a technique for creating or enhancing the illusion of depth in an image by presenting two offset images separately to the left and right eye of the viewer. Anaglyph generation is one of the most cost effective methods of spectroscopic 3D imaging. Almost all human activities are related to some motion. In this paper we discuss about a method to control realtime anaglyph images based on the movement of MEMS inertial sensors. The aim is to track the movements of the sensor and accordingly build a system that controls anaglyph images simultaneously. A system to control anaglyph images using MEMS was developed at the end of experiment successfully. This can be further enhanced to develop various systems based on motion tracking and image creation, like human body modeling and gesture recognition and also to other 3D imaging techniques.