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Access count:#!/usr/bin/perl $log='counts.log'; $iplog='ips.log'; $lastip='lastip.log'; $host=$ENV{'REMOTE_ADDR'}; $path=$ENV{'DOCUMENT_URI'}||$ENV{'REQUEST_URI'}; print "Content-Type: text/html\n\n"; my $sameip=0; open(LASTIP,"+<$lastip"); flock(LASTIP,2); $lastrec=; ($lasthost,$lastpath,undef)=split(/\|/,$lastrec); if (($lasthost eq $host) && ($lastpath eq $path)){$sameip=1;} if ($sameip eq 0) { seek(LASTIP,0,0); truncate(LASTIP,0); $lastrec=join('|',$host,$path,"\n"); print LASTIP $lastrec; } flock(LASTIP,8); close(LASTIP); open(CNT,"+< $log"); flock(CNT,2); @count=; for($el=0;$el<=$#count;$el++) { ($ct,$rec,undef)=split(/\|/,$count[$el]); if($fnd=($path eq $rec)) { if ($sameip eq 0) {$count[$el]=join('|',++$ct,$rec,"\n");} else {$count[$el]=join('|',$ct,$rec,"\n");} last; } } push(@count,join('|',$ct='1',$path,"\n")) unless $fnd; seek(CNT,0,0); truncate(CNT,0); print CNT sort{($b=~/(\d+)/)[0]<=>($a=~/(\d+)/)[0]} @count; flock(CNT,8); close(CNT); print $ct; my $found=0; open(IPR,"< $iplog"); flock(IPR,1); while() { chomp; last if $found=($_ eq $host); } flock(IPR,8); close(IPR); unless($found) { open(IPW,">> $iplog"); flock(IPW,2); print IPW $host,"\n"; flock(IPW,8); close(IPW); }

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Selected Publications

Keyword(s): cardiovascular modeling

[1]
F. Kappel and R. O. Peer. Ein mathematisches Modell für grundlegende Regelungsmechnismen im Herz-Kreislaufsystem. Biomedizinische Technik, 37, Ergänzungsband 1:58–60, 1992.

[2]
F. Kappel and R. O. Peer. A mathematical model for fundamental regulation processes in the cardiovascular system. J. Math. Biology, 31:611–631, 1993.
 
Based on the four compartment model by Grodins we develop a model for the response of the cardiovascular system to a short term submaximal workload. Basic mechanisms included in the model are Starling's law of the heart, the Bowditch effect and autoregulation in the peripheral regions. A fundamental assumption is that the action of the feedback control is represented by the baroreceptor loop and minimizes a quadratic cost functional. Simulation results show that the model provides a satisfactory description of data obtained in bicycle ergometer tests.

[3]
F. Kappel and R. O. Peer. Implementation of a cardiovascular model and algorithms for parameter identification. Bericht 26, Spezialforschungsbereich F003 "Optimierung und Kontrolle", 1995.

[4]
F. Kappel, S. Lafer, and R. O. Peer. A model for the cardiovascular system under an ergometric workload. Surveys on Mathematics for Industry, 7:239–250, 1997.