Author Archives: David C. Abercrombie

SolidLine AG official partner of Team Part-Time-Scientists

Berlin, Germany (April, 2010) – Today, Team Part-Time Scientists announced the SolidLine AG as an official partner of the team. The team uses SolidWorks 2010 to handle all design work, from the lunar lander prototype to their rover called “Asimov Jr.”. Team Part-Time Scientists, headquartered in Berlin, Germany, with 45 team members is among 21 teams from 11 countries that are competing for their share of the $30 million prize purse.

SolidWorks 2010 by SolidLineAG

Only through the use of a modern and highly productive software like SolidWorks it is possible for us to stay ahead in a race against the clock. With the SolidLine AG as our partner it is not just possible for us to lower the costs but also to minimize complex field testings. When choosing a CAD solution quality is the most important criteria. While choosing a partner is all about reliability. That is why we have been working with SolidWorks right from the start,” said Team Leader Robert Boehme.


ABOUT SOLIDLINE
SolidLine AG was founded in 1996, and started with 160 employees. Today, SolidLine AG and their partner, the Dassault Systèmes SolidWorks Corporation, have become Europe’s biggest distribution partner. SolidLine is offering services in the fields of Computer Aided Design (CAD), Product Data Management (PDM), SAP Integration (PLM), Analysis (FEM), Simulation (MKS), Construction (CAM) and technical documentation. SolidLine AG – … design your success. SolidLine.de

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Communication in space

Rockets: not subtle. Rocket science humor, on the other hand … Let’s clear up a few things with the IPv6 protocol and packets in general. First of all: address space. With IPv6, one can uniquely identify 3.4*10^38 items. Now, if we take all the solid components of a rover and lander and compress them together, it would make about 1 cubic meter. If that were entirely aluminum, there would be only 6*10^28 atoms. Without revealing too much, I can tell you we will not need 5 billion network addresses for each atom in our rover. In fact, to add perspective: someday, when we make the sun itself a fully functioning space station, IPv6 will let us support 200 billion network devices per cubic meter! So, we’re going to use a much smaller address space in our packets. But, why bother with a smaller address space? Let’s review some rules of good packet design: Easy to route in hardware. Simple (i. e. easily validated and verified) hardware should be able to move packets between subsystems without requiring mission-specific knowledge of the contained commands. While an address-free packet is technically smaller, using knowledge that commands such as “drive forward” only apply to a rover not to a lander, it rapidly explodes the testing work and greatly adds to risk. Error corrected. The physical transport of information can lose data. At a minimum, a system should be able to detect an error in a packet. Given the time delays and expense of a space mission, a system should be able to correct a little more than the expected typical error rate. Minimum overhead / Maximum data to wrapper ratio. Each bit sent into space is a chance to lose data. To send as few bits as possible, send as few packet wrappers around data as possible. An ideal protocol will vary this ratio depending upon quality of service feedback. There is a balance between these design parameters. For instance, most error correction schemes provide M bits of error correction for every N bits of data. Thus, there is a maximum packet size at which protection drops below mission standards. Sending very small commands makes for excellent error correction, but means more total bits sent into space and more chance for out of sequence or dropped packets, complicating the network software layer. Combining commands can increase overall throughput but reduces redundancy in the error correction. In addition, IPv6 is very easy to route with tested hardware and software already existing, but as it is larger than most commands, it significantly weakens error correction. One must also consider mission timing. When is your deadline and how long will the equipment remain operational? Equipment that will remain operational for many years will be valuable as a communication hub and should strive to use open standards. Short duration equipment, especially on a deadline, needs different engineering tradeoffs. Simple, robust FPGA designs are our preference. For now, we won’t be using the IPv6 headers on our packets, but we look forward to a future with a standards-based space communication network. Once you’ve got a packet layout, you can work on a protocol, defining timeouts, forwarding, delay tolerance, and authentication. Seek the generalities within families of protocols. You’ll find hotly debated topics often to be single variable changes in the final code. Just remember that your goal is to reliably move information through space. Not on the ground and not within a subsystem in a rover, but through space! If you are interested in everything around deep space communications, stay tuned! :-) Wes Faler A Part-Time Scientist
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Interview with MotorFM

Today we got the chance to visit the studio of one of the most extraordinary radio stations in Germany: MotorFM.

We saw how fresh music, interesting shows and news were put together with passion and turned into a very pleasing radio signal. During this tour, we gave an interview on the Google Lunar X-Prize and our team participating in it.

Talking about your own team and the GLXP in interviews is always a good thing. You will get to see the subject from an all new perspective. Besides, it really helps spreading the word about the coolest, but so far only little-noticed competition on earth!

Sven  Wehlan, Robert Boehme, Silke Super

Speaking of good music, our team just started a series of short introductions on each of the team members. Just visit our Hell yeah, it’s rocket science fan page! About every third day one of our members will present themself along with their favorite choice of music for conquering the Moon!


Audio recordings (German)
Interview mit Silke Super, 30.03.10 (MP3)
Interview mit Silke Super, 30.03.10 (M4A)

Robert Boehme
A Part-Time Scientist

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Meeting … Bill Gates!

Guess who we just met?

Mr. Microsoft himself: Bill Gates!

It was very exciting to meet someone who has accomplished so much in his life. He achieved what most people just dream about their entire life. And yet he hasn’t stopped. With his foundation he is tackling the most severe problems of our world.

We had a nice short chat on the Google Lunar X-Prize, our team and of course time to take a picture. Most important to note, he really is the cheerful geeky person as you would figure him! :-)

Many greetings and the best of luck to the “Bill & Melinda Gates Foundation“ in their effort to improve the world we live in!

Robert Boehme
A Part-Time Scientist

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The science of great presentations …

With a well-prepared presentation, you can impress bosses, convince customers to buy your product, get support for your project or simply tell everybody what you think needs to be done. Giving a good presentation is therefore important for you, and vital to the topic you’re presenting. Why can presentations become scary to everyone involved?
As a casual presenter, you may be an expert on the subject at hand, but
are anxious to speak in front of an audience of strangers. The audience, on the other hand, might be having a hard time to catch up with slides packed full with information, while the monotonous and mumbling voice of the speaker seems to be of no help, either.
Then what makes a great presentation?You know, the kind of presentation everyone is talking about. To my mind, giving great talks is not at all reserved to the few among us who can sell refrigerators to Eskimos.

A good presentation is not about the speaker.
It’s about communicating ideas and igniting the audience!
Pragmatically spoken – less is more!
Even if you’re an expert speaking in front of experts, this is no excuse for misusing slides as transcripts.
Try to be passionate, the way you would when talking to friends about the subject!

… and how we almost failed to deliver a good one!

OK, let’s talk about our presentational endeavors now.
Back in December 2009, our team, the Part-Time Scientists, got invited to give a presentation at the 26C3 Congress in Berlin. It was the single biggest event for all of us speakers. I was obviously one of them, and I’m going to let you in on what went wrong and what went well.


As we wanted to have an expert for each subject – aerospace, engineering, development and organization – we split the presentation into four sections and settled for a two-hour time slot. Three weeks before the presentation, we started working on the slides. To cut a long story short: the four of us ended up preparing tons of notes and page-long text files with information. Then, shortly before the conference, I got myself a copy of the book slide:ology. A good friend of mine had found it on Safari Online. Slide:ology deals with all the things that can ruin your presentation, and shows how real experts do their preparation.

Slide:ology by O'Reilly


We threw all our text files overboard. We reworked the slides and made them as plain as possible. It was a hell of a lot of work, and in the end, we had two days left for practicing. The amount of last-minute adjustments, however, left me with almost no time for practicing, plus, I got no more than two hours of sleep the night before the presentation!
Not everything worked out as expected but …
against all odds, our presentation went quite well!
And we had learned our lesson.

Less is  more


To give a good presentation, you should:

  1. start preparing right away, even if the deadline is three months away.
  2. spread the word via Twitter, Facebook or any other medium.
  3. invest a good amount of time working on the slides. My advice: do check out slide:ology!
  4. practice, practice, practice! The minute you finished your first slides, try to practice with them using a timer. What really helped us was recording our trials on webcam. Be yourself and be authentic.
  5. Try to get sufficient rest! If some of your slides aren’t perfect, just leave them that way. You’re the expert, you’re the speaker — your slides won’t change anything about this.

And always remember – have fun!


Robert – a Part-Time Scientist

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“Asimov Jr.” – rover assembly clip

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Texas Instruments Incorporated

Texas Instruments supply us with hardware for our electronic systems. The chips engineered by TI are the "brain" of every device we build. An interesting fact is that it was Texas Instrument's expertise that enabled NASA to land on the moon.

For more information, visit: http://www.ti.com/.

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O’Reilly Verlag GmbH & Co. KG

O'Reilly Verlag GmbH & Co. KG is the German subsidiary of the internationally successful publishing house O’Reilly Media, Inc. They provide information on important and pioneering technologies through high quality publications in form of reference books or eBooks as well as through web services and conferences. The intention is to respond to an existing urgent need for information, and to offer well-founded solutions. Authors of O’Reilly books are active in user groups and technical communities, and therefore have first-hand practical knowledge. Prevailing topics of O' Reilly publications are programming, operating systems, networks, web design and web programming.

For more information, visit: http://oreilly.com/.

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CadSoft Computer GmbH (EAGLE)

Germany’s most successful software for PCB design is currently available in version 5. CadSoft Computer GmbH develop this software in Pleiskirchen/Germany. They not only operate on the European market, but, from their sales office in Florida, in the rest of the world, including South America, South Africa and the Far East. Even electrical engineers in Russia and China are work ing with EAGLE.

For more information, visit: http://www.cadsoftusa.com/index.htm.en.

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Xilinx, Inc.

Xilinx is the world’s leading provider of programmable platforms. Xilinx programmable chips are the innovation platform of choice for today’s leading companies for the design of tens of thousands of products that improve the quality of our everyday lives. Due to their inherent flexibility, Xilinx award-winning programmable solutions are used by more than 20,000 customers to:
  • Deliver innovative new products to market in a matter of weeks
  • Drastically reduce research and development costs
  • Change or upgrade end product features and functions “on the fly” to meet new market demands and adapt to changing industry standards.
For more information, visit: http://www.xilinx.com/.
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