Implementing certain best practices helps the product engineer to get the most value out of DDYA at the lowest cost. The goals are to identify the defect mechanism that caused an excursion, identify a previously unknown systematic yield limiter, or pick the best die to submit to the PFA lab for root-cause identification. The main optimizations in any DDYA process include writing the test program, minimizing test time for the data collection, increasing diagnosis throughput, and reducing time spent performing the yield analysis.

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Implementing certain best practices helps the product engineer to get the most value out of DDYA at the lowest cost. The goals are to identify the defect mechanism that caused an excursion, identify a previously unknown systematic yield limiter, or pick the best die to submit to the PFA lab for root-cause identification. The main optimizations in any DDYA process include writing the test program, minimizing test time for the data collection, increasing diagnosis throughput, and reducing time spent performing the yield analysis.

RS73G1JTTD1803D_Datasheet PDF

Implementing certain best practices helps the product engineer to get the most value out of DDYA at the lowest cost. The goals are to identify the defect mechanism that caused an excursion, identify a previously unknown systematic yield limiter, or pick the best die to submit to the PFA lab for root-cause identification. The main optimizations in any DDYA process include writing the test program, minimizing test time for the data collection, increasing diagnosis throughput, and reducing time spent performing the yield analysis.

While I was waiting for my special two-way mirror glass to arrive, I started thinking about the various ways in which I might want to use this little scamp. Depending on the amount of computing power you have available to you, you could actually do all sorts of clever (and/or silly) things. For example, a few ideas off the top of my head were:

Honestly, once you start thinking about this, your imagination tends to run wild (at least, mind does). But I decided to rein myself in a bit and start with something simple. I decided that all I want is to film a series of short videos of someone whose face has some character”. I'm thinking that a second or so after you've started looking at yourself in the mirror, there could be a ripple” effect and this face could appear saying something like You're not planning on going out dressed like that, are you?” (This will save my wife a lot of time and effort having to say this to me whenever we're heading out to visit our family or friends.)

RS73G1JTTD1803D_Datasheet PDF

Also, I'm going to need a simple proximity detector that determines when someone is standing in front of the mirror and sends an appropriate signal to my computer. Last but not least, I need a really simple piece of software running on the computer that sees” the signal saying that someone is standing in front of the mirror and randomly selects and plays one of my videos.

Step 4: Creating the proximity sensor and special software I live in Huntsville, Alabama, USA (I moved here for the nightlife [grin]). I have a friend called Joe Farr who lives just outside of London in the UK. Joe is amazing when it comes to anything to do with creating software and hardware and – over the years – we've worked on a number of wild and wacky projects together.

So here's the way things happened (this is about a week ago as I pen these words)…  Imagine the scene. We're in the late morning my time, which is early evening in the UK. I'd just ordered my piece of special two-way mirror glass and picked up my LCD monitor and returned to my office. In a few minutes I was planning on heading out to grab a bite of lunch, but first I emailed Joe to tell him about the Magic Mirror concept.

RS73G1JTTD1803D_Datasheet PDF

Joe was on a train heading home from work, but of course he has a smart phone with email capability, so we bounced some ideas back and forth. I explain that all I really need is a simple proximity detector that will send a signal to my computer and some software running on my computer that will randomly play my videos. Then I wander out to lunch…

An hour or so later I return to my office and there's an email from Joe saying that all I need is to pick up a simple (and inexpensive) passive infrared proximity-detector-burglar-alarm type thing. I'm sure you've seen these around; when one detects motion a LED lights up (amongst other things). Joe said that we could use a really simple 8-bit PIC microcontroller to monitor the signal driving the LED, and then squirt this event to my PC using a simple RS232 serial protocol (Joe loves RS232).

RS73G1JTTD1803D_Datasheet PDF

Ah, Ha!” I said, but my notebook computer doesn’t have an RS232 serial connector.”

No worries,” replied Joe, you can pick up a serial-to-USB connector for just a couple of dollars.”

With distributed computing, data travels between a task manager and computing nodes and between computing nodes. In his book Network Analysis, Architecture, and Design, Third Edition, McCabe distinguishes between tightly coupled and loosely coupled computing nodes. Nodes that are tightly coupled transfer information to each other frequently. Nodes that are loosely coupled transfer little or no information.

With some distributed computing applications, the task manager tells the computing nodes what to do on an infrequent basis, resulting in little traffic flow. With other applications, there is frequent communication between the task manager and the computing nodes. In some cases, the task manager allocates tasks based on resource availability, which makes predicting flow somewhat difficult.

Characterizing traffic flow for distributed computing applications might require you to study the traffic with a protocol analyzer or model potential traffic with a network simulator.

Traffic Flow in Voice over IP Networks

The most important concept to understand when considering traffic flow in VoIP networks is that there are two flows. The flow associated with transmitting the audio voice is separate from the flow associated with call setup and teardown. The flow for transmitting the digital voice is peer-to-peer, between two phones or between two PCs running software such as Skype or Cisco IP Communicator (CIPC). Call setup and teardown, on the other hand, can be characterized as a client/server flow because a phone needs to talk to a more complicated device, such as a server or traditional phone switch, that understands phone numbers, addresses, capabilities negotiation, and so on.

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