About Me

My name is Wolf Paulus, a photographer, hiker, hacker, technologist based in Ramona, California. I am focusing on embedded, mobile, and open source technologies and help accelerating the discovery and adoption of emerging mobile technologies. Inspire and innovate, emphasizing mobile and wearables, voice user interfaces, speech recognition and synthesis, and natural language understanding.


I created the Java-based open source XUL Engine SwixML, which Sun’s CTO called “The strongest straightforward design of declarative UI implementations”.

SwixML represents ideas that today are heavily re-used in Google’s Android SDK. (Graphical User Interfaces are described declaratively in XML documents that are parsed and rendered into UI widgets hierarchies at runtime.)

But I have create so much more that I’m extremely proud of.



A lot of my work evolves around early technology prototyping. Still, I’m trying to put some ideas into real world mobile applications.

Take a look at Artist on Android, the Horsemen of Speech Recognition, or other apps that I have published under the Techcasita Productions label in Google’s play store.

Cloud Services

Most mobile applications consume some sort of cloud service. Speed is extreme important for Voice User Interfaces to work well, which means you want to do as much as possible on-device. However, speech recognition accuracy and speech synthesis quality often requires to implement these services in the cloud. Cloud services that I have recently implemented include speech synthesisaggregation, AIML based natural language understanding, and text summarization, including simple sentiment analysis.


I’m appointed to the advisory committee for the Mobile App Development Certificate at the University of California, Irvine, and occasionally speaks at conferences and user groups on topics ranging from Embedded Technology to Declarative Programming, emphasizing UI Generation at Runtime, and everything Voice User Interface related of course.

Have a look at some slide from my most recent talks.

March 7, SoCal Codecamp, CSUF Fullerton

On Saturday, March 7, I will be speaking at the SoCal Codecamp on “Android Push – Android Wear – Android Voice”.
Hope to see you at the beautiful CSUF Campus in Fullerton.

March 11, Android User Group San Diego

On Wednesday, March 11th, I will be speaking at the San Diego Android Developers Group on ‘Wearables, the Internet of Things and Micro Applications’. Hope to see you at Dell Software, 9540 Towne Centre Drive, San Diego, CA
April 14, SDSU Institute of Electronic and Electrical Engineers

On Tuesday, April 14th, I will be speaking at the SDSU Institute of Electronic and Electrical Engineers / IEEE Seminar on Speech Recognition / Synthesis and Natural Language Understanding. You don’t have to put you ear on the ground, and still, can literally hear it coming. The broad introduction of Voice User Interfaces … Hope to see you at the beautiful SDSU Campus at the Institute of Electronic and Electrical Engineers in San Diego.

April 20-21, Mobile Voice Conference 2015, San Jose, California

Mobile Voice Conference 2015 in San Jose, California On April 20-21, I will be speaking at the Mobile Voice Conference 2015 on “Natural Language Understanding – Bridging the gap between Speech Recognition and Application/Business Logic” and “VUI in Wearables and the IoT, technical possibilities and challenges”

May 19, San Diego Java User Group

On Tuesday, May 19th, I will be speaking at the San Diego Java User Group on ‘Wearables, the Internet of Things and Micro Applications’. Hope to see you at their new location, at ResMed 9001 Spectrum Center Blvd., San Diego, CA 92123
August 17-19. SpeechTEK 2015, New York City



On August 18, I will be speaking at the SpeechTEK 2015 conference in New York City, NYC.


Many new concepts that I implement in mobile applications, are communicated best through video clips or short films.

Take a look at some high quality short HD films that I have created over the last few months and years.


“Amateur Professionalism”, a concept used since 2004, describes an emerging sociological and economic trend of people pursuing amateur activities to professional standards. That pretty much describes how I look at my photography work today.

If you like, take a look at some of my photos and the stories behind them, at http://ramonaphoto.com


Installing Tomcat 8 on OS X 10.10 Yosemite

The Servlet 4.0 specification is out and Tomcat 9.0.x will support it. However, at this point Tomcat 8.0.x is the best Tomcat version and it is supporting the 3.1 Servlet Spec.


Since OS X 10.7 Java is not (pre-)installed anymore, let’s fix that first.

read more…

JSON Schema

JSON, the JavaScript Object Notation, has a somewhat misleading name, since it is used for data exchange in a lot of places that have nothing to do with JavaScript. It has become very common that web-services encode all sorts of payloads using JSON, which is then decoded on the receiving end, using libraries like Google’s gson, which can automatically convert JSON documents into Java objects.

In many applications, JSON has replaced XML, which used to be the premier encoding format, used by web-services. JSON is more compact and arguably more readable; with XML however, XML-Schema was used to document or explain and also validate XML encoded data structures.

Fortunately, JSON is catching up in this respect as well. While still under development, the current 4th draft is quite good and already supported by many tools. read more…

Too Close for Comfort?

The DJI Phantom Quadcopter is a real screamer. It’s loud, uncomfortably loud, sometimes even confused for a massive bee swarm. Don’t blame the motors, with the propellers removed, the phantom sounds just like any other quadcopter with inexpensive motors. So for a long time now, I have been looking for the ultimate propeller for the DJI Phantom.

Blade pitch or simply pitch refers to turning the angle of attack of the blades of a propeller or helicopter rotor into or out of the wind to control the production or absorption of power.

The size of a propeller is usually defined by its diameter and pitch. Originally, the DJI Phantom shipped with 8 inch propeller, with a 4.5 pitch, which would be called a 8.0×4.5 or 8045 propeller. While both, diameter and pitch influence the produced thrust, the diameter is mostly responsible for the thrust and the pitch controls the speed of the air leaving the back of the propeller.

read more…


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