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9 <TITLE>Francesco Potortì Software Page
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13 CONTENT=
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14 satellites MTG fracas simulator LEO MEO GEO
15 GNU emacs etags checkiso debian-bug">
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31 <HR> <!---------------------------------------------------------------->
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"/pictures/cnr-4.png" ALIGN=
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35 ALT=
"CNR logo (png 3k)">
36 Software that I wrote for supporting my research activity
45 HREF=
"/curriculum/pot-abstracts.html#R05:MTG-RealTimeSystems97"><CITE>M
</CITE>ulti-Application
46 <cite>t
</CITE>raffic
<cite>g
</CITE>enerator
</A> was written in
1990 to run on
47 a proprietary Motorola Delta SysV Unix running on
68030. It is a
48 programmable packet traffic generator for Ethernet with a
49 <CITE>curses
</CITE>-based frontend and a backend that I wrote. MTG was
50 used to develop, test and evaluate the
<A HREF=
"/foda/foda.html">FODA/IBEA
</A>
51 satellite access protocol.
53 <P> The backend of MTG
54 was a Unix device driver which took control of the timer and Lance
55 interrupts, after having programmed them at the unmaskable level. Since I
56 had no access to the kernel sources, after having studied
<CITE>Writing a
57 Unix device driver
</CITE> by Egan Teixeira I had to get really well
58 acquainted with the Motorola C compiler and then to disassemble a couple of
59 kernel routines. For anyone interested in historical programming,
<A
60 HREF=
"ftp://fly.cnuce.cnr.it/pub/software/unix/mtg.tgz"
61 TYPE=
"application/octet-stream">here
</A> is the code.
69 HREF=
"/curriculum/pot-abstracts.html#R12:Fracas-TelCommSystems99"><CITE>Fra
</CITE>med
70 <CITE>C
</CITE>hannel
<CITE>A
</CITE>ccess
<CITE>S
</CITE>imulator
</A> was
71 written around
1995 to study MAC protocols to access a geostationary
72 satellite channel. It is a little more general than that, though, and can
73 be used to simulate any framed multiple access scheme. It is a very fast,
74 extensible, non-user friendly C program that has been used for several
77 <LI> <A HREF=
"/curriculum/pot-abstracts.html#R03:FODAIBEAvsDistributed-IJSC96">
78 <i>Comparison between distributed and centralised demand
79 assignment TDMA satellite access schemes
</i></A>
81 <LI><A HREF=
"/curriculum/pot-abstracts.html#R07:FODAIBEAvsCFRA-IJSC97">
82 <i>Delay analysis for interlan traffic using two suitable TDMA
83 satellite access schemes
</i></A>
85 <LI><A HREF=
"/curriculum/pot-abstracts.html#R17:VnL-IJSC00">
86 <i>A multi-level satellite channel allocation algorithm for
87 real-time VBR data
</i></A>
90 <P> Everyone is welcome to download the
<A
91 HREF=
"ftp://fly.cnuce.cnr.it/pub/software/C/fracas.tgz"
92 TYPE=
"application/octet-stream">complete sources
</A> and a
<A
93 HREF=
"ftp://fly.cnuce.cnr.it/pub/software/C/fracas-man-0.0.pdf"
94 TYPE=
"application/pdf">draft manual
</A>. There is also a short
<A
95 HREF=
"ftp://fly.cnuce.cnr.it/pub/data/docs/Fracas-slides.pdf">presentation
</A>
96 (
10 slides,
340KB). I will be happy to assist those who would like to
97 adapt Fracas to their purposes.
104 <P> A simulator for Low Earth Orbit satellite constellations that I contributed
105 to design and implement in Java. This is work in progress, of which I made
107 HREF=
"ftp://fly.cnuce.cnr.it/pub/data/docs/GaliLEO-slides.pdf">presentation
</A>
108 (
10 slides,
500KB). GaliLEO has
<A HREF=
"http://galileo.tesa.prd.fr/">its
109 own page
</A> and a
<A HREF=
"/galileo/index.html">local mirror
</A>.
117 <P> This is a package for
<A HREF=
"http://www.octave.org/">Octave
</A>, a
118 high-level language which uses a language very similar to that of Matlab.
119 Leasqr uses the Levenberg-Marquardt algorithm for doing nonlinear regression.
120 I found leasqr on the web, but it did not run on Octave (it was made for
121 Matlab) and so I adapted it and
<A
122 HREF=
"ftp://fly.cnuce.cnr.it/pub/software/octave/leasqr/">published
</A> it.
123 Since then, the original authors Richard I. Shrager, A.Jutan, Ray Muzic, and
124 Sean Brennan agreed to put it under the
<A
125 HREF=
"http://www.gnu.org/licenses/gpl.html">GPL
</A>. Matthias Jueschke tested
126 the program using a non-linear optimisation
<A
127 HREF=
"http://www.itl.nist.gov/div898/strd/nls/nls_main.shtml">test suite
</A>,
128 and was satisfied with the results.
130 <P>The most current version of the leasqr is part of the optimization package
131 at
<a href=
"http://octave.sf.net">octave-forge
</a>. You should refer to the
132 files leasqr.m, leasqrdemo.m and dfdp.m
<a
133 href=
"http://cvs.sourceforge.net/cgi-bin/viewcvs.cgi/octave/octave-forge/main/optim/">therein
</a>.
134 The names of the individual files may change in the future. Please let me know
135 if that happens so I can update this page.
137 <HR> <!---------------------------------------------------------------->
140 <IMG SRC=
"/pictures/gnu-head-3.png" ALIGN=
"right"
141 ALT=
"small GNU Head (png 3k)">
142 Free software that I wrote for the GNU project or for my personal or work
151 <P> On behalf of the
<A HREF=
"http://www.gnu.org/fsf/fsf.html">Free
152 Software Foundation (FSF)
</A> I currently volunteer to maintain
153 <CITE>etags
</CITE>, a program that can be compiled either as a replacement
154 of the classic
<CITE>ctags
</CITE> Unix program or as
<CITE>etags
</CITE>,
155 whose output file format is used by Emacs. The latest (unofficial) version
156 of etags is available for
<A HREF=
"ftp://fly.cnuce.cnr.it/pub/etags.c.gz"
157 TYPE=
"application/octet-stream">download
</A> (
30 KB).
164 <P> A Unix
<A HREF=
"ftp://fly.cnuce.cnr.it/pub/software/unix/checkiso"
165 TYPE=
"application/octet-stream">shell script
</A> for checking a CD against
166 the iso image from which it has been burned. The comparison is made using
167 an MD5 signature built from the original image or from a known good CD.
168 Shows the location of the first read error detected. Can extract a disk Id
169 from the image or the CD itself and build a local database of Ids for
170 future checking of archived CDs. The Id contains the image length, the MD5
171 signature and the Volume ID of the disk, so it can automatically recognise
172 the CD to check. Contains a small internal database of
<A
173 HREF=
"http://www.debian.org/">Debian
</A> <A
174 HREF=
"http://cdimage.debian.org/">CD images
</A>.
181 <P> A Unix
<A HREF=
"ftp://fly.cnuce.cnr.it/pub/software/unix/cgrep"
182 TYPE=
"application/octet-stream">shell script
</A> that wraps around grep to
183 make it understand files compressed with gzip or bzip2. You just use it
184 like grep. If you rename it cegrep or cfgrep it will wrap around egrep or
185 fgrep, respectively. Instead of renaming it, you can use a symbolic or
193 <P> An Emacs add-on script in emacs lisp which simplifies
194 the task of submitting a bug report to the
<A
195 HREF=
"http://www.debian.org/Bugs/">Debian bug tracking system
</A>. Part of
197 HREF=
"http://packages.debian.org/testing/utils/debbugs-el.html">debbugs-el
</A>
198 Debian package. I handed the package over to Peter Galbraith, who is
199 maintaining it much more actively than I was. You can download its
<A
200 HREF=
"http://people.debian.org/~psg/debian-bug.el"
201 TYPE=
"application/octet-stream">latest version
</A>.
208 <P> A Unix
<A HREF=
"ftp://fly.cnuce.cnr.it/pub/software/unix/pottcpdump-1.3"
209 TYPE=
"application/octet-stream">shell wrapper
</A> around
210 <CITE>tcpdump
</CITE> which optionally displays the contents of the packets.
213 <HR> <!---------------------------------------------------------------->
216 Links to interesting software
221 <DT>The Error Correcting Codes (ECC) Page
223 HREF=
"http://www.csl.sony.co.jp/person/morelos/ecc/codes.html">This
</A> is a
224 really good list of free (in various senses) programs for coding and
225 decoding. I keep a
<A HREF=
"codes.html">mirror
</A> of this page.
227 <DT>Forward error correcting codes by Phil Karn
228 <DD>Phil Karn's optimised really
<A HREF=
"http://www.ka9q.net/code/fec/">free