The Gravity of Leadership

I believe that, fundamentally, leaders have followers.  This can be on the technical or management side.  Technical leaders may not mentor directly, but their innovation and wisdom is passed down through implementation or documentation.  Managers are typically more direct through interaction or through their policy.

 

I believe good leaders create a “gravity” that pulls people to them, their ideas or their policies…  IMO, some thoughts:

         Successful leaders are in front of others pulling and challenging  them to advance.  They need to remain close enough (relevant not necessarily proximity)  to create influence (gravitational pull).  Those who are too distant  can be discouraging or have little impact.  Those that are consistently too close (micro) can overwhelm the individual’s unique, separate and growing contribution.

         Successful leaders create a cascade of leaders.  Behind them are leaders pulling others up.  This chain effect allows a leader to scale, to  influence a greater number of people at various levels.

         Successful leaders will not be afraid of creating a gravitational pull that will eventually slingshot some of their followers to an orbit higher than them.  In fact, such leaders should encourage this and be encouraged when this happens.  Great leaders look for these opportunities to invest in others and then celebrate their success.   

Simple LED Flasher using Transistors

Simple LED Flasher Project

I wanted to put together a simple two LED flasher circuit that would use the fewest parts and low power.  My first project of this type used the NE555 timer IC but besides the chip, it requires more power than what I would like to use.   Using a couple low-power NPN transistors, the circuit should be able to run for hours on a 9v battery.

The Circuit

I decided to use two 2N3904 transistors (a low power NPN transistor).  This design uses only 10 components but I added additional resistor to inline with the power source.  It could be removed and the other resistors adjusted to lower the power.

I used a free copy of LTSpice from Linear Technology to create the circuit (most SPICE packages do not have LED components for some reason) – you can download it here:  http://www.linear.com/designtools/software/ltspice.jsp

Which LED will light first?

The Breadboard

I assembled the circuit using a low cost breadboard I picked up at Fry’s Electronics.   Using a breadboard allowed me to play around with different components, especially the capacitors and resistors to tweak the flash rate and brightness.

Single LED Flasher

The simplest single LED Flasher circuit I have found uses a single transistor (NPN), 2 resistors and 1 capacitor.  This circuit uses the transistor as a Negistor using the NDR (negative differential resistance) effect.  The transitor will block current until the voltage threshold charging on C1 reach something close to 9v, at which point the voltage will become large enough to get the emitter-base junction to avelanche and drain the current through the LED.

Click here for the video:
http://jasonacox.com/images/IMG_2022.MOV

Reference

http://wild-bohemian.com/electronics/flasher.html

http://en.wikipedia.org/wiki/2N3904

http://www.linear.com/designtools/software/  (LTspice – Nice circuit design tool based on Spice)

http://jlnlabs.online.fr/cnr/negosc.htm

http://www.cappels.org/dproj/simplest_LED_flasher/Simplest_LED_Flasher_Circuit.html

The Samsung B630 LCD TV

The Amazing Samsung B630 LCD TV

On 6/20/09, we purchased a Samsung B630 40″ LCD TV.  The B630 has an amazing picture.  The 120Hz and high contrast features make this 1080p LCD monitor simply a delight.   The unit comes with 4 HDMI inputs as well as two standard A/V inputs for game consoles (great for the kid’s Wii and Playstatation2).  It also has a network port that pulls in news and weather feeds so you can hit an “info” button the remote and get semi-transparent overlay info boxes while watching your favorite show or movie.  Yes, this is more of a gee-whiz feature than actually useful though we have used it to check the local weather–its accuracy hasn’t been very impressive.

The set has an audio optical out.  I have this fed in to the Samsung DVD home theater system we purchased with the TV.  As expected, the sound is great but activating it always generates a pause while the TV and receiver sync up.  The set also has a USB port on the side that allows you to play media files (pictures, music and movies) from thumb drives and external hard drives.  It is a fantastic feature and providing you have a good quality USB drive, it will stream beautiful full 1080p video.

HDMI Problems

Just over 2 months after buying the unit, our cable suddenly stopped working on our new Samsung B630 LCD TV.  After some quick troubleshooting I discovered that it was only the HDMI-1 input that the cable box was using.  The Samsung DVD Player on the 2nd HDMI port worked fine and the Cable would work when plugged in to any of the other inputs.

I notice another strange behavior.  When the Cable and DVD cables were plugged in to HDMI-2 and HDMI-3, only one of the source inputs would work.  If you select 2 or 3, you would still see the same thing (the Cable which was plugged in to HDMI-3).   Moving things around to the other ports, I was able to do the same thing with the DVD.  This mean that we were not able to use the 2nd or 3rd ports to have HD signal from both the Cable and DVD player.   I eventually hooked up the component cables for the Cable box to the TV so that we could continue to view the up-conversion HD quality of our DVDs.

Samsung Support

The Sumsung website let’s you register and request repair for your Samsung products.  Besides the Samsung LCD TV and Home Theater System, we purchased  and registered our Samsung washer and dryer.   The website can be very frustrating at times.  It is slow and will frequently glitch.  At one point, I encountered a page that had a huge listing of products, complete with their serial numbers and details from other customers.  I didn’t drill in to see if it would present me with customer PII data, but clearly it shows that their web development team has work to do.

I did manage to report the HDMI problem via the website.  It does require that you upload the original receipt.  Unfortunately we had lost this (yes, not a good thing) but we had purchased this at Sears and the sears.com site will allow customers who used their Sears credit to view transaction receipts online.  This allowed me to copy/paste into a Word document and upload that to the Samsung site.    The site let us pick a date for the in-home repair and selected Monday.   We received a call the next morning from the repair team. After getting the details of the problem, they moved the schedule to Tuesday and said they would bring the components that they felt would fix the HDMI problem.

Repair Visit #1

The in-home repair technicians arrived and brought the mainboard replacement.  It looks like a small PC motherboard and is located in the lower left hand corner of the back of the TV, behind the connectors.  I took a picture as the techs were installing the new motherboard.

Back of Samsung B630 40

After installing the new motherboard, the TV flashed a red error message at the top of the set.  The tech attempted to reset the unit using various menu options (picture, firmware, etc.) but it would not clear.  He said that the new mainboard was defective and he would need to order a new one.  He re-installed the old mainboard.

Samsung B630 LCD TV Mainboard

Samsung B630 LCD TV Mainboard

After installing the old mainboard, the HMDI ports started working again!   I asked what they did and he said that it looks like the mainboard has a faulty connector that caused the outage.  He said that it does need to be replaced and they would order a new mainboard.  Until then, the HDMI may or may not stay working. Hopefully it will keep working until they return for their second visit.

It is interesting that Samsung would not quality check their mainboards before sending them out in to the field.  It seems to be a bit inefficient and if our old main-board had not mysteriously started working, it would be very frustrating for the customer.  But I will say that the repair technicians were very good.  They were friendly and quick.

Repair Visit #2

The technicians returned in two weeks to install the new mainboard.  Thankfully the HDMI port did not go out again before the second visit.

References

Samsung B630 LCD TV Manual

Samsung Website for B630 (firmware updates, FAQs, manuals, etc.)

To Engineer is Human

To Engineer is Human: The Role of Failure in Successful Design by Henry Petroski

This is a great book to remind us of the purpose of engineering and the dangers we face when designing technical bridges (and physical ones) across the unknown.

Petroski wrote this in the early 80’s and the examples and illustrations are sometimes dated but still practical. I found the section on computers, “From slide rule to computer” to be particularly interesting.  His case still hold true for the faster/newer techno-driven culture of the 21st century.

We have come to be a society that is so quick to change that we have lost the benefits of one of mankind’s greatest tools–experience.   – Henry Petroski

Engineering is very dependant upon feedback for improvement.  The goal of providing a design solution for the lowest cost will mean that materials, processes and other costly items will be minimized to achieve the most economical/efficient solution.  Unfortunately, there are things that we do not know about (the trite, “we don’t know about what we don’t know” phrase comes to mind) that can be or become significant issues in the design.  The Tacoma Narrows Bridge is a great example of this.

Engineering attempts to introduce “safety factors” into the design model to cover for the unknowns but this can often be inadequate, as was the case of the walkway collapse at the Kansas City Hyatt Regency Hotel.

Failures, while unfortunate and often deadly, should also be opportunities for improvement.  Petroski argues that it is important that details of failures be broadcast to provide corrective feedback to all engineers so that future designs will build on these learnings.

GeForce FX 5200 Problems

I have a e-Geforce FX 5200, 128MB, DDR, AGP Video Controller (p/n 128-A8-N303-L2).  We started having video glitches (blue screens, static and bad lagency on video games).  I took out the controller and noticed that 3 of the capactiors had popped.  Two are FZ72 1000 16V caps and one is a FZ75 1000 6.3V.

Disney War

Author, James B. Stewart, provides a chronological account of the Walt Disney Company during the Eisner 20-year tenure.  This book of nearly 600 pages dives in to the details of the events, players, tragedies and successes that surrounded the on-boarding of Michael Eisner, his career as Chairman and CEO, and the drama surrounding his departure. 

The book is divided into three sections: The Wonderful World of Disney, The Disenchanted Kingdom, and Disney War. 

iWoz: Computer Geek to Cult Icon

This autobiography of Steve Wozniak is a delightful recount of the birth of the personal computer. 

Before cell phones that fit in the palm of your hand and slim laptops that fit snugly into briefcases, computers were like strange, alien vending machines. They had cryptic switches, punch cards and pages of encoded output. But in 1975, a young engineering wizard named Steve Wozniak had an idea: What if you combined computer circuitry with a regular typewriter keyboard and a video screen? The result was the first true personal computer, the Apple I, a widely affordable machine that anyone could understand and figure out how to use.

Wozniak’s life—before and after Apple—is a “home-brew” mix of brilliant discovery and adventure, as an engineer, a concert promoter, a fifth-grade teacher, a philanthropist, and an irrepressible prankster. From the invention of the first personal computer to the rise of Apple as an industry giant, iWoz presents a no-holds-barred, rollicking, firsthand account of the humanist inventor who ignited the computer revolution. 16 pages of illustrations.

Walt Disney: The Triumph of the American Imagination

Walt Disney: The Triumph of the American Imagination by Neal Gabler (2006).

While I haven’t read every biography of this famous visionary, this book about Walt Disney has to be one of the most comprehensive studies of his life.  The attention to detail and depth of research and investigation are exceptional.  The references, notes and bibliography comprise around 100 pages of the 880 page, 2.8 pound volume.

Animation is creating the illusion or alternate reality of life (see the Wikipedia article Disney Animation: The Illusion of Life).   Gabler describes how Walt had an insatiable desire to bring a perfect alternate reality to life.  This steered his passions and energy throughout his life.  Through animation, Walt could project joy, hope, struggles, persistence and emotion onto the two dimensional world of the silver screen.  His desire for perfection demanded quality and innovation.  From the early shorts where he pioneered new levels of animation and synchronized sound (Steamboat Willie) to the realism of Snow White and the Seven Dwarfs, the first American animated feature film in movie history, Walt wanted to bring a new level of entertainment to the masses.  He was shaping a reality that would stir people, cause them to laugh and to cry, to enjoy and to aspire. 

Walt was never happy with status-quo.  With the success of Snow White fueling his dreams, he built the Burbank studio to bring to life something even greater.  With Walt pushing for greater realism in animation, Pinnochio and Bambi were trying to exceed Snow White.  But his heart was always leaning toward something grander.  Consistently Walt would become bored with what he had mastered and would need to push through some new wall.  After Snow White, that would be Fantasia.  He wanted to bring music to life on the animated screen.  This new feature would pioneer an early stereophonic technology called Fantasound, making Fantasia the first commercial film with multichannel sound.  The film opened to mixed critical reaction and failed to generate a large commercial audience, which left Walt in financial straits, something that characterized most of his life, at least until Disneyland.  Author, Neal Gabler comments about this in a Q&A session on Amazon.com:

It is astonishing that Walt Disney was always–and I do mean always–in dire financial straits until the opening of Disneyland. The primary reason wasn’t that his cartoons weren’t making money, because they were–at least until the war in Europe when the loss of that market meant disaster for the features. But even as they were making money, the studio was losing money because Walt was constitutionally incapable of cutting corners, enforcing economies, laying off staff. The only thing about which Walt Disney cared was quality. He thought that quality was the way to maintain his preeminence, though quality also had the psychological advantage of letting him perfect his world. The problem was that quality was expensive. To cite just one example, Walt spent more than a hundred thousand dollars setting up a training program for would-be animators, though even then the return was small because Walt was so picky that very few of the candidates actually qualified to work at the studio. Money meant very little to Walt Disney. It was only a means to an end, never an end in itself.

After Fantasia, Walt needed something new but instead found himself trying to manage and sustain his studio.  The creative “family” he had created over the years turned on him with a strike and the unrelenting creditors demands soon steered him toward survival mode.  Walt and his brother Roy managed to keep the studio together, but at a cost of quality.  Economically produced features like Dumbo and a long string of government sponsored shorts and educational films helped float the studio through hard financial times.  Walt was unhappy in his new role.  Instead of inventing something new, Walt invested in new hobbies, backyard railroad and minatures (from Wikipedia):

During 1949, Disney and his family moved to a new home on a large piece of property in the Holmby Hills district of Los Angeles, California. With the help of his friends Ward and Betty Kimball, owners of their own backyard railroad, Disney developed blueprints and immediately set to work on creating a miniature live steam railroad for his backyard. The name of the railroad, Carolwood Pacific Railroad, originated from the address of his home that was located on Carolwood Drive.

Walt’s passion for the railroad and building miniatures was intertwined with his next great adventure in creating a new reality:  Disneyland.  To dislocate from the now mundane pressures at the Studio, Walt poured renewed energy into his newly formed WED Enterprises to dream and create Disneyland.  This would occupy his focused interest for several years of planning, financing, constructing and operating (with Walt taking personal attention to details and continually “plussing” the park).   Walt loved to meet a challenge and financing Disneyland was definitely a challenge.  However, he had a solution:  Television.   Walt led the charge to bridge the gap between film studios and television.  He has been fascinated with the new medium and his Disneyland idea propelled his desire to enter this new world.  Using a series called Disneyland  and later after the opening of the park, Walt Disney Presents that aired on ABC, Walt would personally host the show that consisted of cartoons, live-action features, and documentaries.  Much of the material was designed to create awareness for Disneyland but was also used to promote upcoming studio feature films.  The show later moved to NBC and taking advantage of the new color television changed its name to Walt Disney’s Wonderful World of Color.

When he did finally pull away from the operations of the park, it was only to focus his attention on a new form of animation, this time in three-plus dimensions: audio animatronics.  Among other things, Walt was focused on creating a believable moving human model in the “Great Moments with Mr. Lincoln” exhibit for the 1964-1965 New York World’s Fair.   After the success of the Mr. Lincoln exhibit, this and other attractions created for the fair (“It’s a Small World” and “Progressland”) were relocated to Disneyland.

Community planning became the next focus on Walt’s life.  He wanted to take the clean and controlled environment that he had been able to create at Disneyland and expand that to a scale of a city.  He invested time and energy researching city planning.  He wanted to bring an idealized community to life through his Experimental Prototype Community of Tomorrow (EPCOT).  This began his search for land that eventually ended up in Florida and became the plans for Disneyworld, now the largest and most visited theme park in the world.  Sadly, he would die on December 15, 1966, prior to realizing the next step in his dream. The night before Walt died, Roy had visited the hospital room and said that he was staring at the ceiling and pointing to where everything was going to be located at EPCOT, including the entrance and exit roads.   With Roy’s leadership of the company, Disneyworld did open but Walt’s community of tomorrow would not be realized.  Instead, a world’s fair, theme park version of his ideas would open in 1982 and be named EPCOT.

Six Not-So-Easy Pieces: Einstein’s Relativity, Symmetry, And Space-Time

This sequel to Richard Feynamn’s Six Easy Pieces grabs six more additional lectures from his famous three-volume series, Lectures on Physics.  In this book, Feynman unfolds the complexity of Relativity, Symmetry and Space-Time.   As is typical for his style, he makes these very complex subjects approachable, but then drives deeper to reveal the mathematics behind the mysteries.   The narrative and related equations are definitely geared toward math and science students. 

As is his genius, Richard Feynman often unpacks complex concepts through the use of practical analogies.  His description of curved space in Chapter 6 was one of my favorite sections (p. 112). 

Curved Space

In order to understand this idea of curved space in two dimensions you really have to appreciate the limited point of view of the character who lives in such a space.  Suppose we imagine a bug with no eyes who lives on a plane, as show in Figure 6-1.  He can move only on the plane, and he has no way of knowing that there is any way to discover any “outside world.” (He hasn’t got your imagination.)  We are, of course, going to argue by analogy.  We live in a three-dimensional world, and we don’t have any imagination about going off our three-dimensional world in a new direction; so we have to think the thing out by analogy.  It is as though we were bugs living on a plane, and there was a space in another direction.  That’s way we will first work with the bug, remembering that he must live on his surface and can’t get out.

As another example of a bug living in two dimensions, let’s imagine one who lives on a sphere.  We imagine that he can walk around on the surface of the sphere, as in Figure 6-2, but that he can’t look “up,” or “down,” or “out.”

Now we want to consider still a third kind of creature.  He is also a bug like the others, and also lives on a plane, as our first bug did, but this time the plane is peculiar.  The temperature is different at different places.  Also, the bug and any rules he uses are all made of the same material which expands when it is heated.  Whenever he puts a ruler somewhere to measure something the ruler expands immediately to the proper length for the temperature at that place.  Whenever he puts any object–himself, a ruler, a triangle, or anything–the thing stretches itself because of the thermal expansion. 

Feynman uses this constructed analogy to explain how the bug would get different measurements in each of these “worlds.”  The bug is able to determine what type of world it lives in based on the measurements.  It is interesting to see through his example that the bug on the sphere experiences the same measurements as the bug on the temperature varying hotplate (both can measure a triangle with an angle-sum of 270 degrees where the bug in the plane would see a maximum sum of 180 degrees).  Scientist speculate on the “space” curvature of the universe by conducting experiments.  So far, it is inconclusive.

In this book, Feynman also covers a refresher course on Vectors (Ch. 1), discusses the Symmetry in Physical Laws (Ch. 2), does a detailed analysis of The Special Theory of Relativity (Ch. 3), Relativistic Energy and Momentum (Ch. 4), Space-Time (Ch. 5), and Curved Space (Ch. 6).

Realativity

The Special Theory of Realativity (p. 49) is a facinating approach to motion that for over 200 years was ruled by equations developed by Isaac Newton.   In Newton’s Second Law, 

which is the same as F=ma (where a is acceleration or the time derivative of velocity, dv/dt), the assumption is that mass (m) is a constant.  Einstein corrected this formula with his theory by saying that mass has the changing value,

where mo is the “rest mass” of a body when it is not moving and c is the speed of light (186,000 mi/s or 3×10^5 km/s).