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<div class=Section1>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Hi everyone:<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Just a reminder that we will have a tcon
at 11 am this morning to discuss the state machine and develop a plan to move
forward for the November board meeting. My feeling is that we will not resolve
all the issues at this point and I may postpone some of the discussion until
the board meeting. But I want to move ahead with building sample applications
and finishing the current release before the board meeting.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>My agenda for today is:<o:p></o:p></span></font></p>
<ul style='margin-top:0in' type=disc>
<li class=MsoNormal style='color:navy;mso-list:l2 level1 lfo5'><font size=2
color=navy face=Arial><span style='font-size:10.0pt;font-family:Arial'>Kevin
Cleary to review the status (see statement on state machines below and posted
on the Wiki at <a
href="http://public.kitware.com/IGSTKWIKI/index.php/Statement_on_State_Machines_Discussion_Kevin_Cleary_24_Oct_2005">http://public.kitware.com/IGSTKWIKI/index.php/Statement_on_State_Machines_Discussion_Kevin_Cleary_24_Oct_2005</a><o:p></o:p></span></font></li>
<li class=MsoNormal style='color:navy;mso-list:l2 level1 lfo5'><st1:PersonName
w:st="on"><font size=2 color=navy face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Kevin Gary</span></font></st1:PersonName><font size=2
face=Arial><span style='font-size:10.0pt;font-family:Arial'> to discuss
the state transition analysis he posted on the web and issues with
consistency of patterns in state machines<o:p></o:p></span></font></li>
<li class=MsoNormal style='color:navy;mso-list:l2 level1 lfo5'><font size=2
color=navy face=Arial><span style='font-size:10.0pt;font-family:Arial'>Some
general discussion about state machines and issues as outlined in my memo:<o:p></o:p></span></font></li>
<ul style='margin-top:0in' type=circle>
<li class=MsoNormal style='color:navy;mso-list:l2 level2 lfo5'><font size=2
color=navy face=Arial><span style='font-size:10.0pt;font-family:Arial'>State
machine dispatcher<o:p></o:p></span></font></li>
<li class=MsoNormal style='color:navy;mso-list:l2 level2 lfo5'><font size=2
color=navy face=Arial><span style='font-size:10.0pt;font-family:Arial'>Event/observer
model<o:p></o:p></span></font></li>
<li class=MsoNormal style='color:navy;mso-list:l2 level2 lfo5'><font size=2
color=navy face=Arial><span style='font-size:10.0pt;font-family:Arial'>If
it turns out that the discussion is not productive at this time, I will
cut it off (sorry) and we will table some of this until the board meeting
– I just want to know the implications for the project if I decide
to table these issues<o:p></o:p></span></font></li>
</ul>
<li class=MsoNormal style='color:navy;mso-list:l2 level1 lfo5'><font size=2
color=navy face=Arial><span style='font-size:10.0pt;font-family:Arial'>I
will limit it to one hour for the discussion and then one hour for action
plans – including a list of to-dos and issues for the future and
also a review of the preliminary board meeting agenda on the Wiki at <a
href="http://public.kitware.com/IGSTKWIKI/index.php/One_Year_Project_Review_Board_Meeting_and_ITK_Course_at_Georgetown">http://public.kitware.com/IGSTKWIKI/index.php/One_Year_Project_Review_Board_Meeting_and_ITK_Course_at_Georgetown</a><o:p></o:p></span></font></li>
</ul>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Finally, note the new teleconference
numbers that have been posted on the Wiki as well:<o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:.5in;text-autospace:none'><font size=2
face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'><o:p> </o:p></span></font></p>
<p class=MsoNormal style='margin-left:.5in;text-autospace:none'><font size=2
face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'>Conference
Access:<o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:.5in;text-autospace:none'><font size=2
face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'>
Toll Free: 1-800-308-9936
<o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:.5in;text-autospace:none'><font size=2
face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'>
Toll:
1-913-643-0019 <o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:.5in;text-autospace:none'><font size=2
face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'>
Passcode: 646202<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Talk to you at 11 am East Coast Time - <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Kevin<o:p></o:p></span></font></p>
<div>
<p class=MsoNormal><font size=2 color=blue face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:blue'> </span></font><font color=navy><span
style='color:navy'> <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New";color:navy'>------------------------------------------------------------------<br>
Kevin Cleary,
Ph.D.
Work phone: 202-687-8253<br>
Associate
Professor
Work fax: 202-784-3479<br>
Deputy Director <br>
<br>
Imaging Science and Information Systems (<st1:place w:st="on">ISIS</st1:place>)
Center<br>
Department of
Radiology
Pager: 202-901-2033<br>
<st1:place w:st="on"><st1:PlaceName w:st="on">Georgetown</st1:PlaceName> <st1:PlaceType
w:st="on">University</st1:PlaceType> <st1:PlaceName w:st="on">Medical</st1:PlaceName>
<st1:PlaceType w:st="on">Center</st1:PlaceType></st1:place>
Cell phone: 202-294-3409<br>
<st1:Street w:st="on"><st1:address w:st="on">2115 Wisconsin Avenue, Suite 603</st1:address></st1:Street>
Home phone: 301-299-0788<br>
<st1:place w:st="on"><st1:City w:st="on">Washington</st1:City>, <st1:State
w:st="on">DC</st1:State>, <st1:PostalCode w:st="on">20007</st1:PostalCode></st1:place>
Home fax: 301-299-0789</span></font><font color=navy><span style='color:navy'><o:p></o:p></span></font></p>
<div>
<p class=MsoNormal><font size=3 color=navy face="Times New Roman"><span
style='font-size:12.0pt;color:navy'> <o:p></o:p></span></font></p>
</div>
<p class=MsoNormal><st1:place w:st="on"><font size=2 color=navy
face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New";
color:navy'>ISIS</span></font></st1:place><font size=2 color=navy
face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New";
color:navy'> center: </span></font><font color=navy><span style='color:navy'><a
href="http://www.isis.georgetown.edu/" title="http://www.isis.georgetown.edu/"><font
size=2 face="Courier New" title="http://www.isis.georgetown.edu/"><span
style='font-size:10.0pt;font-family:"Courier New"'>www.isis.georgetown.edu</span></font></a><br>
</span></font><font size=2 color=navy face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New";color:navy'>Research group: </span></font><font
color=navy><span style='color:navy'><a href="http://www.caimr.georgetown.edu/"
title="http://www.caimr.georgetown.edu/"><font size=2 face="Courier New"
title="http://www.caimr.georgetown.edu/"><span style='font-size:10.0pt;
font-family:"Courier New"'>www.caimr.georgetown.edu</span></font></a><br>
</span></font><font size=2 color=navy face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New";color:navy'>WashCAS: </span></font><font
color=navy><span style='color:navy'><a href="http://www.washcas.org/"
title="http://www.washcas.org/"><font size=2 face="Courier New"
title="http://www.washcas.org/"><span style='font-size:10.0pt;font-family:"Courier New"'>www.washcas.org</span></font></a><br>
</span></font><font size=2 color=navy face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New";color:navy'>Email: </span></font><font
color=navy><span style='color:navy'><a href="mailto:cleary@georgetown.edu"
title="mailto:cleary@georgetown.edu"><font size=2 face="Courier New"
title="mailto:cleary@georgetown.edu"><span style='font-size:10.0pt;font-family:
"Courier New"'>cleary@georgetown.edu</span></font></a><br>
</span></font><font size=2 color=navy face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New";color:navy'>-------------------------------------------------------------------</span></font><o:p></o:p></p>
</div>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>I will absolutely limit the tcon to two hours on Monday: one
hour for discussion and one hour for making an action plan, including listing
all outstanding issues. We will also have our regular tcon this Thursday but at
3 pm East Coast time – those of us at MICCAI who are available will meet
at the hotel registration area at 11:55 am and we can go to my room for the
tcon. Finally, I will send some information about the November ITK class and
review meeting shortly, including hotel information.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Thanks.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Kevin<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face="Courier New"><span style='font-size:10.0pt;
font-family:"Courier New"'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face="Courier New"><span style='font-size:10.0pt;
font-family:"Courier New"'>------------------------------------------------------------------<br>
Kevin Cleary,
Ph.D.
Work phone: 202-687-8253<br>
Associate
Professor
Work fax: 202-784-3479<br>
Deputy Director <br>
<br>
Imaging Science and Information Systems (<st1:place w:st="on">ISIS</st1:place>)
Center<br>
Department of
Radiology
Pager: 202-901-2033<br>
<st1:place w:st="on"><st1:PlaceName w:st="on">Georgetown</st1:PlaceName> <st1:PlaceType
w:st="on">University</st1:PlaceType> <st1:PlaceName w:st="on">Medical</st1:PlaceName>
<st1:PlaceType w:st="on">Center</st1:PlaceType></st1:place>
Cell phone: 202-294-3409<br>
<st1:Street w:st="on"><st1:address w:st="on">2115 Wisconsin Avenue, Suite 603</st1:address></st1:Street>
Home phone: 301-299-0788<br>
<st1:place w:st="on"><st1:City w:st="on">Washington</st1:City>, <st1:State
w:st="on">DC</st1:State>, <st1:PostalCode w:st="on">20007</st1:PostalCode></st1:place>
Home fax: 301-299-0789</span></font><o:p></o:p></p>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
</div>
<p class=MsoNormal><st1:place w:st="on"><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'>ISIS</span></font></st1:place><font
size=2 face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'>
center: </span></font><a href="http://www.isis.georgetown.edu/"
title="http://www.isis.georgetown.edu/"><font size=2 face="Courier New"
title="http://www.isis.georgetown.edu/"><span style='font-size:10.0pt;
font-family:"Courier New"'>www.isis.georgetown.edu</span></font></a><br>
<font size=2 face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'>Research
group: </span></font><a href="http://www.caimr.georgetown.edu/"
title="http://www.caimr.georgetown.edu/"><font size=2 face="Courier New"
title="http://www.caimr.georgetown.edu/"><span style='font-size:10.0pt;
font-family:"Courier New"'>www.caimr.georgetown.edu</span></font></a><br>
<font size=2 face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'>WashCAS:
</span></font><a href="http://www.washcas.org/" title="http://www.washcas.org/"><font
size=2 face="Courier New" title="http://www.washcas.org/"><span
style='font-size:10.0pt;font-family:"Courier New"'>www.washcas.org</span></font></a><br>
<font size=2 face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'>Email:
</span></font><a href="mailto:cleary@georgetown.edu"
title="mailto:cleary@georgetown.edu"><font size=2 face="Courier New"
title="mailto:cleary@georgetown.edu"><span style='font-size:10.0pt;font-family:
"Courier New"'>cleary@georgetown.edu</span></font></a><br>
<font size=2 face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'>-------------------------------------------------------------------</span></font><o:p></o:p></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>Statement on State Machines<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>Kevin Cleary<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>22 October 2005<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>As you are all aware, we have had many discussions about state machines
and how they will be implemented in IGSTK. In the interest of moving the
project forward, I had some discussions with Luis and <st1:PersonName w:st="on">Kevin
Gary</st1:PersonName> and am proposing the following for the Monday tcon.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>First, by way of background, we decided to use state machines early in
the project for these reasons that Luis outlined in “Purpose of State
Machines in IGSTK” on the Wiki. This was a major decision and in some
ways I think the use of state machines is one of the defining points of IGSTK.
We are breaking new ground here in my opinion and therefore it is not
surprising that we are struggling some here.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>However, I still believe state machines are worth the effort and we
actually have made a lot of progress to date in starting to put in state
machines at the component level. From my discussions with Luis and <st1:PersonName
w:st="on">Kevin Gary</st1:PersonName>, there seem to be three major issues with
the state machines:<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal style='margin-left:.5in;text-indent:-.25in;mso-list:l1 level1 lfo2'><![if !supportLists]><font
size=3 face="Times New Roman"><span style='font-size:12.0pt'><span
style='mso-list:Ignore'>1)<font size=1 face="Times New Roman"><span
style='font:7.0pt "Times New Roman"'> </span></font></span></span></font><![endif]>Our
design is getting complicated. This will make IGSTK hard to use if we are not
careful.<o:p></o:p></p>
<p class=MsoNormal style='margin-left:.25in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal style='margin-left:.5in;text-indent:-.25in;mso-list:l1 level1 lfo2'><![if !supportLists]><font
size=3 face="Times New Roman"><span style='font-size:12.0pt'><span
style='mso-list:Ignore'>2)<font size=1 face="Times New Roman"><span
style='font:7.0pt "Times New Roman"'> </span></font></span></span></font><![endif]>We
have not solved the problem of how the state machines will interact together.
This may be the major technical challenge of IGSTK in my opinion and it seems
we do not have examples of other systems that have been built with state
machines to go by. We can put state machines in the components and in the application
no doubt, but how will they interact together?<o:p></o:p></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal style='margin-left:.5in;text-indent:-.25in;mso-list:l1 level1 lfo2'><![if !supportLists]><font
size=3 face="Times New Roman"><span style='font-size:12.0pt'><span
style='mso-list:Ignore'>3)<font size=1 face="Times New Roman"><span
style='font:7.0pt "Times New Roman"'> </span></font></span></span></font><![endif]>We
have not agreed on a mechanism as to how the state machines will communicate
information with each other and how we will get information into the state
machine. Luis has introduced the idea of using an event/observer mechanism to
communicate information (similar to the slots/signals method of Qt) rather than
using Get() methods, but there is disagreement still as to whether this is a
good solution.<o:p></o:p></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>Therefore, at this point I propose the following:<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal style='margin-left:.5in;text-indent:-.25in;mso-list:l0 level1 lfo4'><![if !supportLists]><font
size=3 face="Times New Roman"><span style='font-size:12.0pt'><span
style='mso-list:Ignore'>1)<font size=1 face="Times New Roman"><span
style='font:7.0pt "Times New Roman"'> </span></font></span></span></font><![endif]>Regarding
the design getting too complicated, this is just something we need to pay
attention to as we proceed. I would agree with Luis that code safety is a
higher priority than coder convenience, but I would not want to build a toolkit
that is so complex no one can use it. However, we can have complexity in the
internals of core components provided that the interface is more
straightforward. We can also help here with programming examples and providing
a few well known patterns of interaction as is the case with most any control
framework.<o:p></o:p></p>
<p class=MsoNormal style='margin-left:.25in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal style='margin-left:.5in;text-indent:-.25in;mso-list:l0 level1 lfo4'><![if !supportLists]><font
size=3 face="Times New Roman"><span style='font-size:12.0pt'><span
style='mso-list:Ignore'>2)<font size=1 face="Times New Roman"><span
style='font:7.0pt "Times New Roman"'> </span></font></span></span></font><![endif]>Regarding
the interaction between components, the dispatcher seems like a reasonable
solution. There are some issues with the dispatcher implementation first
suggested by Luis and Andinet at the tcon last week, but in general this seems
to be a good path to pursue. I recommend we discuss this a little more on
Monday, but plan to pursue this as the solution for interaction between
components in the next release of the software.<o:p></o:p></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal style='margin-left:.5in;text-indent:-.25in;mso-list:l0 level1 lfo4'><![if !supportLists]><font
size=3 face="Times New Roman"><span style='font-size:12.0pt'><span
style='mso-list:Ignore'>3)<font size=1 face="Times New Roman"><span
style='font:7.0pt "Times New Roman"'> </span></font></span></span></font><![endif]>Regarding
how the state machines will communicate with each other, I am not ready to sign
onto the event/observer mechanism at this point. I think this should be
discussed more at the board meeting / one year review on Nov. 10. For now, I am
OK with people using Get() methods to communicate and I am OK with Luis/Andinet
experimenting with the event/observer method to see how it works in practice. <o:p></o:p></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>Therefore, at the tcon on Monday, I will propose we move forward this
way. I will limit the tcon to two hours, with the first hour for discussion of these
issues and the second hour to make an action plan and summarize the outstanding
issues. We have some other things to discuss such as creating consistent design
patterns in the state machines, the use of exceptions, and state machines in
base versus derived classes but these are lower level issues to me at the
moment and we will see if there is time to discuss them on Monday or not.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>I certainly appreciate everyone’s input on these issues and I
feel we have a very talented technical team, so it is natural that there may be
some differences of opinion. But I also feel that we need to move the project
forward so that is why I have stepped in (of course, if I have to start coding
again, then we are really in trouble and I recommend you all abandon ship!). Any
comments or suggestions are welcome.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>(end)<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
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