Issue 10 Volume 41 May 16, 2003

selected from the MIT-BIH arrhythmia database is evaluated in terms of BER (bit error rate), PRD (percent of
root-mean-square difference), compression ratio (CR), transmission time, and diagnostic quality. The simulation results show
that during the successful transmission of compressed ECG (when BER is less than 10(-5), a CR of 8:1 provides a 87.5\%
reduction in total transmission time and a higher CR up to 20 can reduce up to 95\% of the required time to transmit the ECG.
Furthermore, most characteristics of the received ECG waveform, such as P wave, QRS complex, and T wave, can be reserved
with clinically acceptable quality.
DTIC
Data Compression; Telemedicine
20030033898 Patras Univ., Greece
A New Methodology to Design Distributed Medical Diagnostic Centers
Baziana, P. A.; Karavatselou, E. I.; Lymberopoulos, D. K.; Serpanos, D. N.; October 25, 2001; 5 pp.; In English; Original
contains color illustrations
Report No.(s): AD-A410378; No Copyright; Avail: CASI; A01, Hardcopy
In a Distributed Diagnostic Center (DDC), patients’ examinations (exams) are performed in Remote Units (RUs) and the
collected data (images, lab exams, etc) are sent to expertise Diagnostic Units (DUs) for evaluation. The DDC’s quality of
service per exam is considered through several factors, such as patient’s wailing time, RU-DU communicating load, expert’s
occupancy, priority, administrative cost, etc. This paper introduces a new methodology for DDC design by controlling the
above factors. We consider any RU through exams sources and any DU through exams’ buffers and servers. Any exam created
by a RU source is temporarily stored into a DU buffer and then is evaluated by a DU server. The proposed methodology is
based on a buffers’ model that evaluates the total RU-DU exams’ traffic load, taking into account the sources’ productivity
and the exams’ priority. Simulating the exams’ delay in the sources, buffers and servers we affect the DDC’s performance.
Simulating results, using real data acquired by Hellenic DDCs of private domain, are also demonstrated in this paper.
DTIC
Telemedicine; Data Transmission
20030033932 Helsinki Univ. of Technology, Espoo (Finland)
Power Control and Transmission Rate Management in Cellular Radio Systems
Jaentti, R.; Dec. 10, 1999; 118 pp.
Report No.(s): PB2003-102649; Copyright; Avail: National Technical Information Service (NTIS)
The scarce radio spectrum imposes hard limitations on design of cellular radio systems. To provide communication
services with high capacity and good quality of service requires powerful methods for sharing the radio spectrum in most
efficient way. In practice, all sharing methods introduce interference which is proportional to the transmitter powers. The
transmitter power control is a key technique to balance the received signal strength and the interference power, which in turn
enables more efficient sharing. Emerging multimedia service can be characterized by different quality of service requirements
such as minimum transmission rates. For a real-time service, users must be guaranteed a tolerable minimum rate. However,
non-real time applications, i.e. delay insensitive applications, may temporarily lower their transmission rates even to zero,
utilizing any excess capacity that the system has. In this thesis, the transmitter power control and the transmission rate
management problems are examined. For the fixed-rate systems, we show that considerable improvements in the convergence
speed and energy efficiency can be achieved. For the multi-rate (multimedia) system, we examine certain class of combined
transmitter power control and transmission rate management algorithms. In addition, implementations of these algorithms are
briefly discussed.
NTIS
Wireless Communication; Transmission Rate (Communications); Telecommunication
20030034602 Pontificia Univ. Catolica, Brazil
Telemedicine System Based on Radio Cell Phone Technology
Cruz, F. P.; Neto, G. N.; Nohama, P.; Oct 2001; 5 pp.; In English; Original contains color illustrations
Report No.(s): AD-A410530; No Copyright; Avail: CASI; A01, Hardcopy
This paper presents a system for transmitting ECG signals using recent cell phone technologies. The aim of the project
is to give physicians and clinical staff the possibility to monitor homecare and emergency patients using telemetry. The
acquired signals can be viewed at both ends of the system, i.e., transmitter and receiver. Before transmitting the signals, the
system acquires them by using an acquisition board installed in a PC computer. The software for displaying these signals at
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