Maximally Flat IIR Fullband Differentiators with Flat Group Delay Responses

A new design method for maximally flat IIR fullband differentiators with flat group delay responses is derived in this paper. The design method starts from the flatness conditions of magnitude response and group delay response at the origin. After mathematical manipulations it shows that presented design method reduces to solving the system of linear equations. By increasing the orders of polynomials in numerator and denominator, degrees of flatness are increased, that is improvement in magnitude responses and group delay responses in terms of flatness is obtained.

INVESTIGATION OF XENON-FILLED TUBE BREAKDOWN VOLTAGE AND DELAY RESPONSE AS POSSIBLE DOSIMETRIC PARAMETERS FOR SMALL GAMMA RAY AIR KERMA RATES

This paper presents experimental results of dynamic breakdown voltage and delay response as functions of gamma ray air kerma rate for xenon-filled tube at 2.7 mbar pressure. Gamma ray air kerma rate range was considered from 123 nGy h–1 up to 12.3 mGy h–1 in order to investigate the possibility of the application of this tube in gamma radiation dosimetry. It was shown that the variations of the above-mentioned parameters are considerable up to the dose rate of 1.23 μGy h–1, which points to the possibility for application in small dose rate gamma ray dosimetry. Physical processes that make dominant impact to dynamic breakdown voltage and delay response during xenon-filled tube irradiation are also discussed in the paper.

Group Delay Equalization of Polynomial Recursive Digital Filters in Maximal Flat Sense

The paper presents the development of an algorithm to obtain stable allpass filter, which acts as a group delay equalizer, with the aim to equalize group delay of the polynomial IIR filter in a maximal flat sense. The proposed method relies on a set of nonlinear equations, derived directly from the flatness conditions of the group delay response at the origin in the [Formula: see text]-plane, with the order to obtain the unknown values of the allpass filter coefficients. The algorithm implemented in the MATLAB platform returns the coefficients of allpass filter. In the given example, first we construct a minimum phase polynomial IIR digital filter with a maximally flat magnitude at origin, next we augment the system with cascade connection of nonminimum allpass digital filter with order to equalize the group delay response of the whole filter in a maximally flat sense.

IMPLEMENTATION OF INTERNET-BASED EMERGENCY MEDICAL SERVICE (EMS) AT OUT-OF CARDIAC ARREST HOSPITAL (OHCA): A SOLUTION TO IMPROVE CARDIAC ARREST RESPONSE TIME AND ITS POTENTIAL APPLICATION IN INDONESIA

Out-of Hospital Cardiac Arrest (OHCA) is a condition when heart stops beating in out of the hospital. The majority of OHCA leads to death because of the delay response. Emergency Medical Service (EMS) system is needed to take care of the patients carefully. The development of Internet-based EMS is one of the best solutions, which is not only to improve the response time, but also to help patients to get the ambulance immediately. The aim of this paper was to understand how the Internet -based EMS can be used and how it will affect the patients with OHCA. Our findings indicated that the Internet-based EMS with mobile web service is critically needed for immediate response of cardiac arrest and accident situation in pre-hospital condition. However, the Internet-based EMS development needs to involve inter-sectoral agencies, such as fire fighter, police, and National Search and Rescue (SAR) Agent.