The photographer, James Balog, has been working for ExtremeIceSurvey. Seeing is believing...

Very impressive, well worth watching.
Statements on information technology and software engineering topics, maintained by Dr. Gernot Starke.





yourname@gmail.comyou now send to
yourname+docs@gmail.com... the string "+docs" is ignored by gmail - and you can use a simple filter rule to add a label to all those mails...
Update (March 11th 2008): Some people asked, wether it is safe to store documents in GMail. IMHO it is not. I would currently not store any sensitive information there (nor at any other online-location!). But not every document is really sensitive...

We have presented a simple-to-implement known-plaintext at-
tack on the A5/1 stream cipher, and given an implementation
on a small FPGA. The attack is novel over previous attacks
in that it needs only a very small amount of plaintext frame
data. A distributed implementation on specialized hardware
was projected to derive a key within half a minute on the av-
erage. We conclude that the A5/1 algorithm is not secure for
longer phone calls.
Note: This entry will be updated in the near future - stay tuned if you're interested in DDD!!





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8eezu....


The term "governance" has been regularly appearing in IT publications and conferences for some time, but among technical circles, such discussions are often yawn-provoking at best. This article provides a developer-friendly guide to SOA Governance, starting with the general notion of IT governance down through design-time and the second runtime Governance.




$APP_PACKAGE/../MagicDraw UML $APP_PACKAGE/../MagicDraw UM 14.0L MagicDraw UML directory of the MD installation accordingly: MagicDraw UM 14.0
main(...)
//...
long start = System.currentTimeMillis();
init_rule_file();
long begin_fact = System.currentTimeMillis();
pre_init_working_memory();
wm.fireAllRules()
long end = System.currentTimeMillis();
//...

Every time this page is displayed, our server generates a unique set of custom, high quality, cryptographic-strength password strings which are safe for you to use.
An ESB by itself produces no business value. An ESB is a means to an end, not the end itself. An ESB is like the electrical wiring or plumbing of an SOA. Plumbing does not produce value; sinks with water coming out of their faucets do. Wiring does not produce value; lights, especially lights connected to switches, are valuable. A road is not valuable except that it enables you to get from one point to another. An ESB without an SOA is like a road from someplace nobody is located going to other places nobody wants to be. People might eventually want to go to those places, but in the meantime, the road is all cost and no benefit.
"Develop an ESB as part of developing the SOA. You will discover services based on business needs. Each service requires not only providers and consumers, but also a channel in the ESB to connect the two. That channel implements the service interface just like a provider (but acting as a proxy), including message formats for service requests and responses that enable remote invocation (such as interprocess communication) of the service. Differences in the consumers’ and providers’ service interfaces, message formats, scope, and qualities of service can be bridged and facilitated by mediations. All of this is the core of ESB design, and none of this can be done without knowing the services the ESB invokes. And knowing those services requires knowing the services in the SOA that will use the ESB.
In this light, connecting the applications is the easy part. Connecting their business functionality is the much greater challenge. That cannot be achieved by building only an ESB.
A Take 5 is an audio enhanced five minute PowerPoint show on a pertinent topic. The REST Take 5 is really 15 minutes, but gives a good 40,000 foot, managerial overview of REST.
/System/Library/CoreServices/"Menu Extras"/User.menu/Contents/Resources/CGSession -suspend
gcolor(blue).
gcolor(plaid).
gcolor(orange).
gcolor(red).
gpos(1).
gpos(2).
gpos(3).
gpos(4).
golfer( [_, C, P] ) :- gcolor(C), gpos(P).
golferRiddle( G1, G2, G3, G4) :- golfer(G1),golfer(G2),golfer(G3), golfer( G4),
G1 = [fred, FredCol, FredPos ],
G2 = [joe, JoeCol, 2],
G3 = [tom, TomCol, TomPos],
TomPos =\= 1, TomPos =\= 4,
TomCol \= orange,
G4 = [bob, plaid, BobPos],
/* unique colors */
is_set([FredCol, JoeCol, TomCol, plaid]),
/* unique positions */
is_set([FredPos, TomPos, BobPos, 2]),
/* Fred's right neighbour wears blue */
plus( FredPos, 1, FP1),
member( [_, blue, FP1], [G1, G2, G3, G4]).

"Having received community feedback 4.0 will start the push to reclaiming the Drools name.... So to help speed up this process, I would please encourage everyone now to use "JBoss Drools" in any articles, blogs, talks etc."
"Dr. Gernot Starke has created a walk through of the Golfing example which can be found here: http://rbs.gernotstarke.de/samples/samples/golfer-riddle-jbr.html.
It's great that someone has taken up the role of documenting our examples, this is something we've purposefully held back on doing, hoping the community would take up this role - Thank you Dr Starke."



Markdown enthusiasts, please forgive me. This list is not ment to be complete. Errors are mine, all credit to John Gruber!
Preceed heading with 1-6 hashes (#). Example:
# This is H1
Note: Closing #’s are optional.
To enumerate list items, preceed item with a dotted number:
1. first item2. second item
1. third item (yes - markdown can handle it...)
yields:
first item
second item
third item (yes - markdown can handle it…)
Note: Markdown cares for the correct numbering, your actual numbers are ignored.
To draw a horizontal line, just put *** or === on a line by themselves.
Enclose a word in * or _ (underscore) to emphasize - both are rendered into `` tags. You might use ** to make things especially important :-)For example: `important` yields important.
Trivial: Surround link with < and >, like this: <http://www.gernotstarke.de> yields http://www.gernotstarke.de.
Simple way: [an example](http://www.it-and-more.blogspot.com/ "My Blog") for inline links, results in “an example for inline links”.
Reference links (cool!): This is [an example][id] for reference links. Some lines later you define your link-label on a line by itself:
`[id]: http://it-and-more.blogspot.com/ (with a title)
Yields: an example
I get 10 times more traffic from [Google][] than from [Yahoo][] or [MSN][]. and the links defined as follows:
[google]: http://google.com/ (Google)
[yahoo]: http://search.yahoo.com/ (Yahoo Search)
[msn]: http://search.msn.com/ (MSN Search)
Yields: I get 10 times more traffic from Google than from Yahoo or MSN.
This options is way shorter to write.
Similar to links, start with !(exclamation mark). Example: .

You might use reference id’s, as in links… very practical.
Want to write source code on web pages? Geek, aren’t you? Just indent every line of the block four spaces or 1 tab.
Note: Markdown behaves nicely, it converts ugly & and Umlaut-stuff like ÜÖÄ into proper HTML entities.
Single lines of code (or even single words) are wrapped with backtick-characters `.
Gotta use HTML for such kind of things.
"you can send a post card of your avatar’s face or some other theme via second life to a real world address. i don’t know if this is really useful, but it’s a quite cool idea".
Wie halten Sie Ordnung in den Dateien und E-Mails auf Ihrem Rechner? Grübeln Sie noch, wohin Sie eine bestimmte Datei speichern sollen, oder ordnen Sie schon in Web-2.0-Manier? Lesen Sie hier den Reality-Check von "Tags-versus-Folders".
"Crowdsourcing can be looked at as an application of the wisdom of crowds concept, in which the knowledge and talents of a group of people is leveraged to create content and solve problems."
"...SOA also is a mess waiting to happen.
By encouraging widespread reuse of scattered software components, SOA threatens to transform the enterprise network into a complex, sprawling unmanageable mesh."
"OpenUP/Basic is an iterative software development process that is minimal, complete and extensible."
The Eclipse Process Framework (EPF) aims at producing a customizable software proess engineering framework.hhm - what a goal...
While preparing our talk on IT-Trends for OOP 2007 (Januar 22-25 in Munich) I had to upgrade my Mac to newer versions of Ruby and Rails - and found some gorgious links on these topics:
si genialer Artikel von Detlef Schmalenberg im Kölner-Stadt-Anzeiger trug den Titel "Bin ich zu blöd" und beschrieb anhand (pointierter) Beispiele die hohe, teilweise überbordende, Kompliziertheit und Komplexität des modernen Alltags.
Schmalenberg spricht in diesem Bericht von der "galoppierenden Spezialisierung" - ein Trend, den wir in der Informatik ebenfalls mit voller Härte erleben. Wo gestern noch fundiertes Grundlagenwissen genügte, hervorragende IT-Systeme zu bauen, da braucht es heutzutage zusätzlich eine Plethora unterschiedlicher Frameworks und Produkte, um Software "reif" zu machen.
In Trainings rege ich seit langem an, dass Architekten jeden Morgen ihren persönlichen simpled starten sollten, um systematisch und kontinuierlich Dinge zu vereinfachen. Leider versäumen das viele...
Ralf Westphal hat das unter einem ganz anderen Blickwinkel betrachtet, nämlich dem der IT-Fachzeitschriften ("Quo vadis, Fachzeitschriften?").
I'm always fond of tipps on organizing (my) ideas, loose-pointers, notes-for-future-projects and such stuff. I found a (free) tool named IdeaKnot (Mac and PC versions available), which fulfills my needs - simple and unobtrusive. It allows ideas to be tagged in groups, has a rich-text description field and a simple search function - all I need.
Hier einige Tipps, wie IT-Architekten die Ergebnisse ihrer Arbeit effektiv (d.h. zielgerichtet) und effizient (mit angemessenem Aufwand) an ihre Projektbeteiligten kommunizieren können:
- Sichten (Kontext-, Baustein-, Laufzeit- und Verteilungssicht)
- Hierarchieebenen (abstrakt und detailliert)
- Bearbeitungsrichtungen (Top-Down und Bottom-Up)
So - und nun viel Erfolg! (Ich freue mich über Feedback dazu - und weitere Tipps...)
Only recently I heard about the immensly popular online-game "Second Life" - where literally millions of (real) people inhabit a virtual world - community-building in perfection. Statistics from October 2006 count more than 30.000 residents logged in every day!
IBM took up the idea of community building and invited more than 300.000 employees, partners and clients to form their own community - and develop new ideas for products and services (I found this interesting report in Newsweek!). IBM's boss declared that they will spend significant amounts (> 100 Million US$) on those ideas. Cute idea - let everybody from your workforce and partners help you to collect and shape ideas - that's a way to realize group-potential!
I hurried to open a (free!) secondlife account - meet me there (Zorg42).
Update (Sun. 26th): Frank (see comment) wrote about this stuff - and pointed to Entropia (which supports only Windows-XP clients, SecondLife supports both Windows and MacOS).
People research strange things. Some guys from Akishima Laboratories (Osake University) came up with a machine that can paint on water by creating waves in a cylindrical tank. Watch yourself. If you come up with a (practical) application for that thing (called AMOEBA), let me know. On the other hand, it surely is great fun building absolutely useless high-tech geek-stuff - if the funding is right :-)
To prepare a joint-presentation or other workgroup-stuff, a shared (auto-sync) folder without the need of a central server is a nice thing to have. A few years of Groove definitely spoilt me - but there will be no Mac version in the near future (remember: Groove-founder Ray Ozzie, see also here, way back also foundet Lotus and is now chief software architect for Microsoft) .
Now I found FolderShare - a free service by a small company called ByteTaxi (which was aquired by Microsoft in 2005). They provide clients for both Windows and MacOS, no fancy features but pure p2p file sharing, encrypted, closed workgroups, fast, no-hassle. It's operated mostly in a browser (I tried Firefox and IE under Windows and OmniWeb and Firefox on Mac - no problems).
Groove still is way cooler - but Windows-only :-( Foldershare does what it's supposed to do - seems to be "here-to-stay". At least for me and my (small) workgroup :-)
Die SOPHISTEN, industrielle und praktische Wegbereiter des methodischen Requirements-Engineering, feierten am 14. November 2006 ihr 10-jähriges Firmenjubiläum. Erstens herzlichen Glückwunsch an Chris Rupp, ihren "Rolo" und das gesamte Team.
Zweitens Glückwunsch zu dieser Feier (aah - ich durfte neben dem genialen Ambiente des Nürnberger Presseclubs auch noch eine kleine Rede halten) - nice crowd. Die Anwesenheit so vieler hochkarätiger Kunden bestätigt, dass es auch in Zeiten der Sparwut auch noch intensive und freundliche Partnerschaften gibt - das schaffen jedoch nach meiner Einschätzung nur sehr wenige Unternehmen. Also - weiter so.
(Mein...) Highlight des Tages: Gerhard Wohland's Vortrag über Denkwerkzeuge - wirklich denkwürdig! Niemals habe ich jemanden vorher derart druckreif sprechen hören!
(Kleine Randbemerkung: Schick, dass man im Presseclub das offene WLAN des benachbarten iMAX Kinos mitverwenden kann :-)
Prioconference fand vom 14.-15. November im wunderschönen Kurort Baden-Baden statt - gediegenes Ambiente, geniale Location (an die Veranstalter: Toll ausgesucht!). Klarer Schwerpunkt: dotNET - in allen Varianten (was beim Veranstalter dotNETpro auch nicht wundert). Gute 200 TeilnehmernInnen sorgten für idealen Füllstand der Vorträge.
Neu (und gut!) an dieser Veranstaltung war das Konzept der Vorab-Strukturierung: Die wesentlichen Themen hatten die Veranstalter im Vorfeld identifiziert und dann dazu passende Sprecher ausgesucht. Somit war bereits a priori gewährleistet, dass Inhalte auch zueinander passen und es weder Überschneidungen noch Auslassungen gibt. In diesem Sinne hat Ralf Westphal eine gute Hand für die Themen bewiesen.
Den Eröffnungsvortrag hielt ein wahrer Guru - Miguel de Icaza, bekannt als Gründer des Gnome-Projektes und des schon legendären Mono-Projektes (das macht übrigens die wichtigsten Teile des .NET Frameworks unter Linux und MacOS lauffähig - und öffnet damit für Windows-Entwickler neue Welten für Deployment).
Miguel's Talk war mind-boggling: Selten durfte ich einem derart kurzweiligen, vielseitigen und überzeugenden Vortrag zuhören - der Mann (junger Kerl, völlig ohne Allüren) wurde vom Time-Magazin als einer der Top-100 Innovatoren des neuen Jahrtausends gekürt - zu Recht! Da baut er als Demo flugs unter Windows eine kleine Forms-Applikation zusammen, die er dann unter (VMWare sei dank) unter Linux startet. Kategorie ultracool! Gegen Ende seines Vortrags trat das Kind-im-Manne zutage - da demonstrierte er (unter MacOS X), wie man unter Mono coole Echtzeitstrategiespiele bauen kann.
Ich durfte mit meinem Vortrag über "Software-Produktion" den Kontext für die übrigen Themen aufspannen: Anforderungsanalyse, Architektur, Entwicklung, Test, Betrieb - in all diesen Disziplinen müssen IT'ler heutzutage professioneller arbeiten, um unserem dynamischen Markt zu genügen.
Einige aktuelle Infos zum Thema "Enterprise-Architektur":
Na, das ist ja mal eine GUTE Nachricht: Der BGH hat beschlossen, dass die von der EU geforderte Vorratsdatenspeicherung mit geltendem Recht nicht zu vereinbaren ist.
Ich finde, diese Art der angeblichen Verbrechensprävention wäre mit dem klassischen Begriff der Vernunft nicht vereinbar gewesen. Hätte nichts, aber auch GAR nichts genutzt und immens viel gekostet...
Mal schauen, wie lange es vom Tisch bleibt...
Peter Roßbach hat mich netterweise darauf hingewiesen, dass IBM (laut Wikipedia) bereits 1956 eine (Art) Festplatte gebaut und an Kunden vermietet hat.
Ich hatte vorher auf meinem WJAX-Vortrag die These vertreten, dass die zentralen Ideen von SOA bereits vor der Erfindung der Festplatte (und nach der Erfindung des C-Compilers) entstanden - aber lose Kopplung, klare Schnittstellung und Metadaten waren sicherlich 1956 noch nicht en vogue.
Jedoch bleibe ich dabei: Die Grundideen von SOA schwirren (unter anderen Überschriften) schon lange durch die IT-Welt...
Mastering Software-Architectures - vom dynamischen Referentenduo Peter Hruschka und Gernot Starke. Im schicken und praktischen Münchener Hotel Eden-Wolf, Nähe Hauptbahnhof, findet vom 12.-15. Dezember 2006 mal wieder der beliebte Architekturworkshop statt.
Aktuell dieses Mal: Vorstellung des arc42-Templates Version 2.1, das zur OOP im Januar 2007 live gehen wird. Gegenüber der Version 1.5 wurden diverse Details geändert und viele Hinweise von Anwendern eingearbeitet.
Noch (Stand 5. November) sind übrigens noch wenige Plätze frei - Anmeldung gerne per Mail an "info<at>arc42.de". Mehr Infos hier.
Did you ever forgot to attach a file to an email you just wrote - similar to the following:
"Dear Bill, please find attached my combined patches to your Vista Kernel. I fixed 975.765 critical and 658.230 fatal errors."
You found the mail appealing, pressed the "send" button - and desaster stroke: Bill received the mail, but without the attachment. The product was delivered without your valuable contribution :-)
Stefan was really nice - he attached the screenshot of a fancy mail.app plugin names attachment scanner (oh - did I mention this is for Mac-users only?), that checks the wording of your messages for hints of attachments - and warns you if you send the mail without the precious contents.
In Gregor-the-Guru Hohpe's writeup of 2006 JAOO-Conference I found an interesting statement on MDA:
"... we discussed the trend towards MDC –Model-driven Crap."
As I'm personally more a friend than a foe of model-driven approaches, I'll let Gregor speak for himself. You got to come to your own conclusion concerning models, meta and such stuff. At least I found out in real projects that MD-approaches CAN help some people!
By Rick Mugridge and Ward Cunningham (yes, the c2-guy and wiki-inventor), Prentice Hall 2005. A very convincing book - if you don't yet know or use the FIT acceptance testing framework (plus its comanion FITNESSE, the acceptance-testing-wiki), this book will surely motivate you to give those two a try! If you never had the opportunity to use FIT in a real project - that'l surely change. The book, brilliantly structured, well written, carefully edited, contains starting points for many projects to come. Five stars!
My next quest will be the evaluation of the different FIT implementations - as a few of my current projects are non-Java - but that'll be covered in a future posting.
As the Apple Mac I'm curently using is a real *ix machine, reminding me of my prior life - when that operating system was still in its infancies. Back then we worked unmanly hours - in the quest of fulfilling both our diploma thesis and our wish to explore the unknown... Nethack was the game of choice in those days - played by numerous players within the computer science departement of the RWTH Aachen. This game had two positive aspects: First it tought me the vocabulary needed to understand Harry Potter in his native tongue (otherwise I would have failed to understand potions, spells and other wizard's speak) and second it was available on every machine I used since then.
Only recently I met the unchallenged champions of the game (aka suru) and found out that the famous blogger Eric S. Raymond authored the Nethack manual... and I still did never manage to find that Amulet of Yendor. Have fun - but be warned: Once you manage to decently play the game, you'll probably never be the same gamer again.
Some while ago I investigated methods and tools to support my self- of. I read every available book on time- and self-management (and even gave trainings on those subjects - but that was long before you were probably conceived). I started with a Palm-Pilot - and seriously failed with it.
Ok - after trying out many approaches, I finally reached GTD (getting things done), by pretty famous David Allen. (you find a very concise summary here). I'm happy (only happy, not perfectly happy) with kGTD, a (naturally Mac) Omni-Outliner-based implementation of this method (the guys from OmniGroup a currently implementing a native version called OmniFocus). Supported by a variety of MindMaps (to brainstorm and structure ideas of single projects) it works as my "self-organizing-infrastructure. No more to-do lists on paper!
I added two utilities to this setup:
Gute Pausenlektüre - Space-Blog der ersten weiblichen Weltraumtouristin - ehemals aus Iran nach USA geflohen und dort eine bilderbuchhafte Karriere hingelegt - in wenigen Jahren eine Firma aufgebaut und für >500 Mio$ verkauft - jetzt Mäzenin und Astronomie-Studentin :-) Kompliment, Frau Ansari.
Das Karlsruher CM-Network (zur Förderung der Zusammenarbeit von Industrie und Wissenschaft) veranstaltet am 28. Oktober 2006 das 7. Herbst-Symposium "Wie gefährlich ist Sicherheit".
Beschränkte Teilnehmerzahl - interessante Vorträge.
Update vom 5.Nov. 2006: Mein Vortrag (Sicherheit in Architektonien) steht ab sofort dort zum Download bereit.
OK - mir merkt man die >15 Jahre Windows an. Mit welcher Software, fragte ich mich, brenne ich denn nur ISO-Images auf dem Mac? Die Antwort ist einfach - mit MacOS selbst (via MacOS X Hints).
Das Buch "Patterns kompakt" erschien Anfang September in der zweiten, deutlich erweiterten Auflage.
Es fasst die wichtigsten Entwurfsmuster zusammen, die Sie für Software-Entwicklung benötigen. Software-Entwickler,-Architekten und -Designer finden darin effektiv anwendbare Lösungen
für tägliche Entwurfsprobleme.
€(D) 14,- / €(A) 14,40 / sFr 22,-
ISBN 3-8274-1591-8
A nice post by Esther Derby (which I happen to not know personally). She describes three rules of communication - which are _very_ valid in conversations between client and consultant (and equally valid between managers and software-developers!):
Ich habe ein neues Editorial für arc42 geschrieben - und weise darin auf die häufige Fehlbehandlung hin, die der Informationstechnik in vielen Unternehmen immer noch zuteil wird.
I learned from Stefan that it might be useful to inform you about my upcoming speaking engagements. Here's what's fixed so far from September 2006 until January 2007:
plus some private engagements, that's practical boredom-avoidance for a while :-)
Bruce Tate, well-known author of award-winning Java books (Better, Faster, Lighter Java) now takes the R-Train: Apart from releasing a book called From Java to Ruby he has written about two hot topics in one article: REST on Rails.
Quote:
The core abstraction in REST is a remote resource instead of a remote procedure call.
In a nutshell, REST queries and manipulates resources with HTTP.
It is not IT, but well worth digesting: Daniel Gilbert, Harvard professor, reasoned "He who cast the first stone probably didn't" - and gives some pretty good examples of (mismatched) action and reaction. (free registration required, unless you already have an NYT account)
His conclusion: "Until we learn to stop trusting everything
our brains tell us about others — and to start trusting others themselves — there will continue to be tears".
Pretty fundamental stuff!
Full article appeared in NY-Times, came to me via Peter Hruschka and Tom DeMarco from Atlantic Systems Guild - thanx, guys.
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Ergänzung (5.Aug.06): Ein Teil des Artikels steht nun bei heise.de online...
New comments (August 2006), after several weeks of more-or-less intensive usage:
"Why do you think, these guys have become market analysts and not software engineers?"
Hi Gernot,
Thanks for your interest in Groove 2007. At this time we don't have plans for a Mac specific version, but we are working with our Mac Office team to determine how to move forward with Groove on the Mac platform. The switch to Intel chips, of course, makes the future a little harder to navigate.
Groove does function fine under Virtual PC so that's an option for today's hardware.
Marc
