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explicitly deallocated heap objects, none of which are in Ada. Ada does non-integer fixed-point types, which is very rare. Otherwise, the feature-list differences are minor. Interested readers can read my more complete summary of the differences between Modula-3 and Ada at www.cs.wichita.edu/~rodney/ languages/Modula-Ada-comparison.txt.

Rodney M. Bates TALOSS Participants

In the November 2003 issue, acknowledgements were inadvertently omitted from the TALOSS (Three-Dimensional Advanced Localization Observation Submarine Software) article. Mr Ken Lima of NUWC was the originator of the TALOSS concept and the project's manager, without whose leadership this project would not be possible. The authors also would like to thank the Office of Naval Research (ONR) Code 311 (Mr Paul Quinn, Mr Gary Toth and Dr Larry Rosenblum) for the funds to complete the project.

ONR (Dr Rosenblum) funded Dr Gregory Neilsen and Mr Gary Graf of Arizona State University to develop software that computes the intersection of irregular 3-D regions within TALOSS. That software is the same software included in TALOSS as described in the subject article. A patent application for this software already has been prepared by its inventors (Graf, Nielsen, Lima and Drury).

A major portion of the TALOSS software was written at Virginia Tech University under the direction of the NUWC by graduate student, Fernando DasNeves. The funding for his work was provided under a NAVCITTI Virginia Tech grant administered by ONR (Dr Rosenblum).

The Naval Research Laboratory contributed that laboratory's expertise in 3-D rendering and visualization to the NUWC-led project. NRL (initially Mr Rob King), conducted research on 3-D interactive devices in the immersive variant of the TALOSS. Mr Douglas Maxwell, then an NRL employee, subsequently developed a 3-D grid-based approach to ocean floor rendering within TALOSS using the digital nautical chart database. Mr Maxwell also developed the collision detection algorithms used in TALOSS. Mr Maxwell's primary role, since joining NUWC a year ago, has been as a technical consultant to the project.

Mr Richard Shell of NUWC has served as the technical lead for the TALOSS Project for the past three years. Mr Todd Drury is the NUWC software development lead for TALOSS and has been responsible for the design and development of the TALOSS software for the past three years. The bottom rendering approach currently implemented in TALOSS and referenced in the Linux Journal article is Mr Drury's work, with Mr Maxwell's as a candidate to follow. A patent for this software was submitted several months ago.

The authors would like to express regret in the inadvertent omission of these acknowledgements. Thanks to the hard work and dedication of all involved, this project was a resounding success.

Douglas B. Maxwell, MSME, Research Scientist/Mechanical Engineer, Naval Undersea Warfare Center

More on Cluster Apps Please

I have had a personal nagging curiosity to build my own home cluster out of a few boxes that are readily available. Once I have it, what can I possibly do? Regarding that question, your November 2003 issue was fantastic but lacked the one thing I would like to read more about. Could you maybe consider an article describing the different applications that are available for clusters?

Linux Training?

As a self-taught Linux user, I really enjoy and appreciate the information that gets published in LJ. I am wanting to learn more and am looking for courses in Linux, but only seem to find the occasional Linux conference or workshops that offer Linux certifications. Being Linux-certified is my goal, but I know I still require classroom study. Can you point me in the right direction? Thanks! Keep up the good work!

Jason Fales, Dallas, Texas

Try the directory at lintraining.com.—Ed.

fgets Good, gets Bad

I enjoyed Cal Erickson's article, "Writing Secure Programs", in the November 2003 issue, and definitely plan on looking at

FlawFinder and other tools. One nit: "Do not use fgets when reading data, as this allows overflows." I think this was a typo; it should have read "gets...allows overflows", because fgets has a length parameter.

Collin Park

You're right. As soon as you finish that "Intro to C" class that requires you to use gets, you just don't use it anymore.—Ed.

License for Bioinformatics Software

In the November 2003 cover article, "Sequencing the SARS Virus", Krzywinski and Butterfield refer to phred, phrap and consed as the "open-source workhorses" of the Human Genome Project. Although these programs are indeed bioinformatics workhorses, and although the no-fee academic licensing terms under which they are available are generous by proprietary software standards, the terms under which they are distributed do not conform to the Open Source definition at least to the extent that they discriminate against fields of endeavor. The terms apply to academic or nonprofit use but not to business use (Open Source definition version 1.9, section 6).

BLAST, another workhorse mentioned in the article, has diverged into two main branches, one in the public domain (which can be obtained from the National Center for Biotechnology Information [NCBI]) and one distributed in a fashion similar to phred, phrap and consed.

D. Joe Anderson Errata

October 2003, page 88: in Listing 1 of the article "Building a Linux IPv6 DNS Server" by David Gordon and Ibrahim Haddad, there should have been a closing brace after the first two lines.

November 2003, page 50: in the Command-Line Bionformatics Sidebar of "Sequencing the SARS Virus" by Martin Krzywinski and Yaron Butterfield, the t in the third line of code should be tr. 0

We welcome your letters. Please submit "Letters to the Editof to [email protected] or SSC/Editorial, PO Box 55549, Seattle, WA 98155-0549 USA.

Is security this big when managing your data center?

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