Add joss publication to subfolder

joss/paper.bib

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+@inproceedings{hyrodyn,
+author = {Kumar, Shivesh and von Szadkowski, Kai and Mueller, Andreas and Kirchner, Frank},
+year = {2018},
+month = {10},
+pages = {},
+title = {HyRoDyn: A Modular Software Framework for Solving Analytical Kinematics and Dynamics of Series-Parallel Hybrid Robots}
+}
+
+@misc{phobosrepo,
+  title = {Phobos Github Repository},
+  year = {2019},
+  howpublished = {\url{https://github.com/dfki-ric/phobos}}
+}

joss/phobos_joss.md

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+---
+title: 'Phobos: A tool for creating complex robot models'
+tags:
+  - robotics
+  - Blender
+  - Python
+  - URDF
+  - SDF
+  - model
+authors:
+  - name: Kai von Szadkowski
+    affiliation: 1
+  - name: Simon Reichel
+    orcid: 0000-0002-0190-9780
+    affiliation: 1
+  - name: Julius Martensen
+    affiliation: 2
+affiliations:
+ - name: German Research Center for Artificial Intelligence GmbH - Robotics Innovation Center, Bremen
+   index: 1
+ - name: Robotics Group, University of Bremen
+   index: 2
+date: 01 February 2019
+bibliography: paper.bib
+---
+
+# Summary
+
+The rise of task specific requirements for robots leads to an increasing
+complexity of the affiliated system. To ensure a seamless, simulation based
+development of both hard- and software a virtual twin is necessary, which is
+able to reflect different aspects of the mechatronic system. Most description
+formats for these systems are based on [**XML** ](https://www.xml.com/)
+(e**X**tensible **M**arkup **L**anguage), which encodes the necessary data for
+simulation, e.g. mechanical structure, inertial data, visual and collision
+representations. However, the initial modeling or continuous refinement of the
+model based on design iterations, sensor and actor integration can be a time
+consuming, challenging task for the modeler. Also, tiny mistakes in the model
+description can lead to huge differences in the modeled system. With increasing
+model complexity the model files become even more difficult to debug.
+
+![[Universal Robots UR5](https://www.universal-robots.com/products/ur5-robot/) within ``Phobos``](PhobosUR5.png)
+
+``Phobos`` is an add-on for the open-source 3D modeling software
+[Blender](https://www.blender.org/) that allows users to edit models of robots
+and their environments for robotics research and applications.
+
+It integrates seamlessly in Blender's GUI and adds functionality for creating
+accurate representations of robotic systems with clearly defined kinematic
+chains, actuators and sensors in a WYSIWYG (**W**hat **Y**ou **S**ee **I**s
+**W**hat **Y**ou **G**et) environment.
+
+To simplify common workflows further, all components of ``Phobos`` models in
+Blender can be annotated with custom data fields both individually or in
+groups. Such data can become part of exported model formats that support them
+(e.g. to define new types of sensors and other hardware devices) or kept for
+internal use, enabling the user to manipulate multiple components of a model
+using custom [Python](https://www.python.org/) scripts. As ``Phobos`` is built
+on Blender's internal Python scripting
+[API](https://docs.blender.org/api/current/), it is easy to create scripts that
+work with both Blender- and ``Phobos``-specific data.
+
+Current features of ``Phobos`` include:
+
++ support for a number of common description formats for robotic devices, such
+  as:
+  - [URDF](http://wiki.ros.org/urdf) (**U**nified **R**obot **D**escription
+    **F**ormat)
+  - [SDF](http://sdformat.org) (**S**imulation **D**escription **F**ormat)
+  - [SMURF](https://github.com/dfki-ric/phobos/wiki/smurf) (**S**upplementable
+    **M**ostly **U**niversal **R**obot **F**ormat).
+- visual representation of many different components, such as model links and
+  joints, inertias, motors etc.
+- hierarchical overview over the model
+- useful batch tools, like renaming, reorientation of the model tree etc.
+- automated mass and inertia calculation
+- saving and loading of different model poses
+- tools for maintaining your own model database
+- creation of submodels which can be incorporated into other models
++ definition of export configurations, where the high fidelity model is either
+  used as a template or can be simplified
++ internal checking of associated data for integrity
++ an additional library containing Python examples for automatic model adaption
+
+Furthermore, the user can tap into  Blenders capabilities to visualize joint
+limits via the Pose Editing Mode, simplify associated visual and collision
+meshes or write Python scripts to modifiy the model objects. Since import and
+export are plugin-based, adding another format is as simple as adding a Python
+script to the respective subfolder. Phobos uses a Python dictionary in which
+all model information is stored for I/O purposes, thus new developers do not
+have to program against Blender's representations of model elements.
+
+Phobos was developed at the German Research Center for Artificial
+Intelligence's Robotics Innovation Center
+([DFKI-RIC](https://robotik.dfki-bremen.de/en/startpage.html) in Bremen in
+collaboration with the University of Bremen's [Robotics
+Group](https://www.uni-bremen.de/en/fachbereich-3/robo/). The goal behind its
+development is to simplify the task of creating accurate descriptions of
+robotic systems in an intuitive and less error-prone way than editing them by
+hand in a text editor, and to provide an open-source alternative to exporting
+such models from proprietary CAD systems.
+
+It has been used recently to provide the models for seriell-parallel hybrid
+robots modelling [@hyrodyn].
+
+Phobos can be found at Github [@phobosrepo].
+
+# Acknowledgements
+
+We acknowledge contributions from Stefan Rahms, Ole Schwiegert und Malte Langosz.
+
+``Phobos`` was carried out in the projects:
+
++ LIMES, a collaboration between the DFKI Robotics Inno- vation Center and the
+  University of Bremen, funded by the German Space Agency (DLR, Grant numbers:
+  50RA1218, 50RA1219) with federal funds of the Federal Ministry of Economics
+  and Technology (BMWi) in accordance with the parliamentary resolution of the
+  German Parliament.
++ D-RoCK, funded by the German Aerospace Center (DLR) with federal funds from
+  the Federal Ministry of Education and Research (BMBF) (Grant Numbers:
+  01IW15001)
++ TransFit, which is funded by the German Federal Ministry of Economics and
+  Technology (BMWi) according to a resolution of the German Bundestag, grant
+  no. 50RA1701, 50RA1702 and 50RA1703.
+
+# References