Database access can be seen as a series of communicating systems each contributing to the overall efficiency of the query. This paper investigates the effect that impedance mismatch has on speech database access: the efficiency of database transactions between the corpus and the querying application(s). A system where impedance mismatch has been reduced through an object-oriented paradigm is pr...

Given a collection {Z1, Z2, . . . , Zm} of n-sided polygons in the plane and a query polygon W we give algorithms to find all Zl such that W = f(Zl) with f an unknown similarity transformation in time independent of the size of the collection. If f is a known affine transformation, we show how to find all Zl such that W = f(Zl) in O(n+ log(m)) time. For a pair W,W ′ of polygons we can find all ...

We consider energy transfer from an elastic actuator to load, and show that the can be optimized by tuning Young's modulus of impedance matching host material.

This paper proposes a new index to determine the static voltage stability of the load buses in a power network for certain operating conditions and hence identifies load buses which are close to voltage collapse. The proposed index is formulated from the quadratic equation derived from a twobus network and is computed using the apparent power and the line impedance. The proposed index shows how...

When performing in-situ measurements of conducted emission, it is not always possible to use a LISN (line impedance stabilisation network). This is especially the case when testing large machines, where a LISN with a high current capacity is needed. In this paper some alternative test methods are proposed to measure conducted emission. The measurements are compared to the LISN measurement and e...

Nowadays lots of applications in telecommunications require a wide bandwidth to transmit more information and improve the quality on the transmission of this information. In order to guarantee this condition low losses systems are designed; these losses can be classified in dissipation losses and mismatch losses. There are different classic methods for impedance matching, but they reach the imp...

The first transistor-based impedance matching circuit for radio-frequency (RF) applications is introduced in this paper. It adapts arbitrary output impedances of RF blocks to desired values between 50 and 250 , from 0 to 5GHz, while occupying only 0.005mm2 of circuit area in a 0.35μm SiGe BiCMOS process. Its superiority over traditional passive-element networks can be resumed by the following f...

Performance of a helical antenna designed for 2.4-GHz WLAN is experimentally investigated in terms of impedance matching. A section of the helical wire near the antenna feed point is replaced by a simple triangular copper strip. By deploying such technique, impedance matching can be achieved. Overall return loss is below −14 dB across entire WLAN frequency range. Moreover, overall return loss d...