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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
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<TITLE></TITLE>
<META NAME="GENERATOR" CONTENT="OpenOffice.org 1.1.3 (Linux)">
<META NAME="AUTHOR" CONTENT="Daniel Schockett">
<META NAME="CREATED" CONTENT="20050428;1023200">
<META NAME="CHANGEDBY" CONTENT="Liviu Lalescu">
<META NAME="CHANGED" CONTENT="20050707;16424000">
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<BODY LANG="en-US" DIR="LTR">
<DIV TYPE=HEADER>
<P ALIGN=RIGHT STYLE="margin-bottom: 0.2in"><BR><BR>
</P>
</DIV>
<P ALIGN=CENTER STYLE="margin-left: 0.74in; text-indent: -0.76in; margin-bottom: 0in">
<FONT FACE="Garamond, serif"><FONT SIZE=4><B>FET – Time
Constraints Documentation</B></FONT></FONT></P>
<P ALIGN=CENTER STYLE="margin-left: 0.74in; text-indent: -0.76in; margin-bottom: 0in">
<BR>
</P>
<P ALIGN=RIGHT STYLE="margin-left: 0.74in; text-indent: -0.76in; margin-bottom: 0in">
<BR>
</P>
<P ALIGN=LEFT><FONT FACE="Garamond, serif">Constraint2ActivitiesConsecutive</FONT></P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<BR>
</P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<FONT FACE="Garamond, serif"><B>Subtags: </B>Weight, Compulsory,
First_Activity_Id, Second_Activity_Id</FONT></P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<BR>
</P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<FONT FACE="Garamond, serif"><B>Description: </B>You have two
activities that you want to schedule one after the other, in the same
day. Order is important. It adds, to the fitness of the chromosome, a
value that grows as the 2 activities are scheduled farther one from
each other. For the moment, fitness factor increases with one unit
for every additional hour and one unit for every day (the optimal
being 0 - when the starting time of the second activity is the ending
time of the first one). A user needed a timetable to respect the
requirement that 2 activities follow one after the other (order is
important). For compulsory and non-compulsory, normal error reporting
is done. The conflicts are a difference in days + a difference in
hours. The number of conflicts is multiplied with 2 if the first
activity is weekly (not bi-weekly) and again multiplied with 2 if the
second activity is weekly.</FONT></P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<BR>
</P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<BR>
</P>
<P ALIGN=LEFT><FONT FACE="Garamond, serif">Constraint2ActivitiesGrouped</FONT></P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<BR>
</P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<FONT FACE="Garamond, serif"><B>Subtags: </B>Weight, Compulsory,
First_Activity_Id, Second_Activity_Id</FONT></P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<BR>
</P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<FONT FACE="Garamond, serif"><B>Description: </B>You have two
activities that you want to schedule one after the other, in the same
day. Order is not important. It adds, to the fitness of the
chromosome, a value that grows as the 2 activities are scheduled
farther one from each other. For the moment, fitness factor increases
with one unit for every additional hour and one unit for every day.
(For hours, we have a 0 as minimum if the activities are OK, a
positive constant value if they overlap and a positive increasing
value if they are not touching. For days - we have a simple absolute
difference). A user needed a timetable to respect the requirement
that 2 activities follow one after the other (order is not
important).For compulsory and non-compulsory, normal error reporting
is done. The conflicts reported are: the difference in days +or- the
difference in hours if the activities are too far from each other. It
is a constant number if the activities overlap; 0 if the hours are
OK. The number of conflicts is multiplied with 2 if the first
activity is weekly (not bi-weekly) and again multiplied with 2 if the
second activity is weekly.</FONT></P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<BR>
</P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<BR>
</P>
<P ALIGN=LEFT><FONT FACE="Garamond, serif">ConstraintActivitiesNotOverlapping</FONT></P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<BR>
</P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<FONT FACE="Garamond, serif"><B>Subtags: </B>Weight, Compulsory,
Number_of_Activities, Activity_Id, Activity_Id</FONT></P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<BR>
</P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<FONT FACE="Garamond, serif"><B>Possible Subtags: </B>More
Activity_Id</FONT></P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<BR>
</P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<FONT FACE="Garamond, serif"><B>Description: </B>It aims at
scheduling a set of activities so that they do not overlap. The
number of conflicts is considered the number of overlapping hours.</FONT></P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<BR>
</P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<BR>
</P>
<P ALIGN=LEFT><FONT FACE="Garamond, serif">ConstraintActivitiesPreferredTimes</FONT></P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<BR>
</P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<FONT FACE="Garamond, serif"><B>Subtags: </B>Weight, Compulsory,
Teacher_Name, Students_Name, Subject_Name, Subject_Tag,
Number_of_Preferred_Times, <B>Preferred_Time</B></FONT></P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<BR>
</P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<FONT FACE="Garamond, serif"><B>Preferred_Time Subtags:
</B>Preferred_Day, Preferred_Hour</FONT></P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<BR>
</P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<FONT FACE="Garamond, serif"><B>Description: </B>It returns conflicts
if a set of activities is scheduled in another interval than the
preferred set of times. The set of activities is specified by a
subject, teacher, students or a combination of these. A user
suggested that ConstraintActivityPreferredTimes should be more
general. Now, you can specify a teacher, the students and a subject
as a filter to a set of activities that must be scheduled in certain
intervals.</FONT></P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<BR>
</P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<BR>
</P>
<P ALIGN=LEFT><FONT FACE="Garamond, serif">ConstraintActivitiesSameStartingHour</FONT></P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<BR>
</P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<FONT FACE="Garamond, serif"><B>Subtags: </B>???</FONT></P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<BR>
</P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<FONT FACE="Garamond, serif"><B>Description: </B>It aims at
scheduling a set of activities at the same starting hour. The number
of conflicts is considered the sum of differences in the scheduling
time for all pairs of activities. The difference in the scheduling
time for a pair of activities is considered the difference in the
starting hour. TODO: Weekly activities are counted as two and
bi-weekly activities as one (really necessary?). IMPORTANT: The
compulsory constraints of this kind implement chromosome repairing,
so no conflicts will be reported</FONT></P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<BR>
</P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<BR>
</P>
<P ALIGN=LEFT><FONT FACE="Garamond, serif">ConstraintActivitiesSameStartingTime</FONT></P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<BR>
</P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<FONT FACE="Garamond, serif"><B>Subtags: </B>Weight, Compulsory,
Number_of_Activities, Activity_Id, Activity_Id</FONT></P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<BR>
</P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<FONT FACE="Garamond, serif"><B>Possible Subtags: </B>More
Activity_Id</FONT></P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<BR>
</P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<FONT FACE="Garamond, serif"><B>Description: </B>It aims at
scheduling a set of activities at the same starting time. The number
of conflicts is considered the sum of differences in the scheduling
time for all pairs of activities. The difference in the scheduling
time for a pair of activities is considered the sum between the
difference in the starting day and the difference in the starting
hour. TODO: Weekly activities are counted as two and bi-weekly
activities as one (really necessary?). IMPORTANT: Starting with
version 3.2.3, the compulsory constraints of this kind implement
chromosome repairing, so no conflicts will be reported. For
compulsory constraints, the solution candidate is repaired before
evaluation (so all solutions will respect these constraints and there
will be no conflicts reported). This is faster, as an input file from
user Ian Fantom proved. For non-compulsory constraints, the method is
conflict reporting (slower, worse than the above method).</FONT></P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<BR>
</P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in"><FONT FACE="Garamond, serif">ConstraintActivityEndsDay</FONT></P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<BR>
</P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<FONT FACE="Garamond, serif"><B>Subtags: </B>Weight, Compulsory,
Activity_Id</FONT></P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<BR>
</P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<BR>
</P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<FONT FACE="Garamond, serif"><B>Description: </B>It returns a
conflicts factor that increases with the number of lessons that
follow after this activity (in the same day).</FONT></P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<BR>
</P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in"><FONT FACE="Garamond, serif">ConstraintActivityPreferredTime</FONT></P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<BR>
</P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<FONT FACE="Garamond, serif"><B>Subtags: </B>Weight, Compulsory,
Activity_Id, Preferred_Hour, Preferred_Day</FONT></P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<BR>
</P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<FONT FACE="Garamond, serif"><B>Description: </B>It adds, to the
fitness of the chromosome, a fitness factor that grows as the
activity is scheduled farther from the wanted time For the moment,
fitness factor increases with one unit for every hour and one unit
for every day. For compulsory constraints, the solution candidate is
repaired before evaluation (so all solutions will respect these
constraints and there will be no conflicts reported). This is faster
(proved practically, not theoretically). For non-compulsory
constraints, the method is conflict reporting. The procedure reports
a conflicts factor that is increasing with the distance to the
desired period. This might generate worse solutions, if you are only
interested in the exact placement. In this case, please use
ConstraintActivityPreferredTimes with only one preferred time.</FONT></P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<BR>
</P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<BR>
</P>
<P ALIGN=LEFT><FONT FACE="Garamond, serif">ConstraintActivityPreferredTimes</FONT></P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<BR>
</P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<FONT FACE="Garamond, serif"><B>Subtags: </B>Weight, Compulsory,
Activity_Id, Number_of_Preferred_Times, <B>Preferred_Time</B></FONT></P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<BR>
</P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<FONT FACE="Garamond, serif"><B>Preferred_Time Subtags:
</B>Preferred_Day, Preferred_Hour</FONT></P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<BR>
</P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<FONT FACE="Garamond, serif"><B>Description: </B>It returns conflicts
if the activity is scheduled in another interval than the preferred
set of times. You can specify a set of time slots when this activity
can be scheduled (a kind of OR of more
ConstraintActivityPreferredTime). Important: For only one
non-compulsory preferred time, ConstraintActivityPreferredTimes might
behave better than ConstraintActivityPreferredTime, depending on
whether you are interested in minimizing the distance to this
preferred time or only in reaching the exact preferred time. Please
see the detailed observation in the explanation of
ConstraintActivityPreferredTime.</FONT></P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<BR>
</P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<BR>
</P>
<P ALIGN=LEFT><FONT FACE="Garamond, serif">ConstraintBasicCompulsoryTime</FONT></P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<BR>
</P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<FONT FACE="Garamond, serif"><B>Subtags: </B>Weight, Compulsory</FONT></P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<BR>
</P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<FONT FACE="Garamond, serif"><B>Description: </B>This class comprises
all the basic compulsory constraints (constraints which must be
fulfilled for any timetable) - the time allocation part.</FONT></P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<BR>
</P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<BR>
</P>
<P ALIGN=LEFT><FONT FACE="Garamond, serif">ConstraintBreak</FONT></P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<BR>
</P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<FONT FACE="Garamond, serif"><B>Subtags: </B>Weight, Compulsory, Day,
Start_Hour, End_Hour</FONT></P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<BR>
</P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<FONT FACE="Garamond, serif"><B>Description: </B>It constrains the
timetable to not schedule any activity in the specified day, between
the start hour and end hour.</FONT></P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<BR>
</P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<BR>
</P>
<P ALIGN=LEFT><FONT FACE="Garamond, serif">ConstraintMinNDaysBetweenActivities</FONT></P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<BR>
</P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<FONT FACE="Garamond, serif"><B>Subtags: </B>Weight, Compulsory, Day,
Number_of_Activities, Activity_Id, Activity_Id, MinDays</FONT></P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<BR>
</P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<FONT FACE="Garamond, serif"><B>Possible Subtags: </B>More
Activity_Id</FONT></P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<BR>
</P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<FONT FACE="Garamond, serif"><B>Description: </B>It refers to a set
of activities and involves a constant, N. For every pair of
activities in the set, it does not allow the distance(in days)
between them to be less than N. If you specify N=1, then this
constraint means that no two activities can be scheduled in the same
day. N=2 means that each two subactivities must be separated by at
least one day. Example: 3 activities and N=2. Then, one can place
them on Monday, Wednesday and Friday (5 days week). Example2: 2
activities, N=3. Then, one can place them on Monday and Thursday, on
Monday and Friday, then on Tuesday and Friday (5 days week).</FONT></P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<BR>
</P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<BR>
</P>
<P ALIGN=LEFT><FONT FACE="Garamond, serif">ConstraintStudentsEarly</FONT></P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<BR>
</P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<FONT FACE="Garamond, serif"><B>Subtags: </B>Weight, Compulsory</FONT></P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<BR>
</P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<FONT FACE="Garamond, serif"><B>Description: </B>It adds, to the
fitness of the chromosome, a fitness factor that is related to how
early the students begin their courses. The result is a timetable
having more activities scheduled at the beginning of the day.
IMPORTANT: biweekly activities are treated as weekly ones, for speed
and because in normal situations this does not matter. It is a
constraint that imposes the condition that all the students must
begin their courses as early as possible. You have to be careful with
this constraint: if any set of students begins the classes later than
the first hour in a certain day, you will get a conflict.</FONT></P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<BR>
</P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<BR>
</P>
<P ALIGN=LEFT><FONT FACE="Garamond, serif">ConstraintStudentsNHoursDaily</FONT></P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<BR>
</P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<FONT FACE="Garamond, serif"><B>Subtags: </B>Weight, Compulsory,
MaxHoursDaily, MinHoursDaily</FONT></P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<BR>
</P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<FONT FACE="Garamond, serif"><B>Description: </B>The result is a
timetable respecting the condition that all of the students must not
have too little or too much hours in a day.</FONT></P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<BR>
</P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<BR>
</P>
<P ALIGN=LEFT><FONT FACE="Garamond, serif">ConstraintStudentsNoGaps</FONT></P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<BR>
</P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<FONT FACE="Garamond, serif"><B>Subtags: </B>Weight, Compulsory</FONT></P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<BR>
</P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<FONT FACE="Garamond, serif"><B>Description: </B>It adds, to the
fitness of the chromosome, a conflicts factor computed from the gaps
existing in the timetable (regarding the students). The overall
result is a timetable having less gaps for the students.</FONT></P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<BR>
</P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<BR>
</P>
<P ALIGN=LEFT><FONT FACE="Garamond, serif">ConstraintStudentsSetIntervalMaxDaysPerWeek</FONT></P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<BR>
</P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<FONT FACE="Garamond, serif"><B>Subtags: </B>Weight, Compulsory,
Students, Start_Hour, End_Hour, Max_Intervals</FONT></P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<BR>
</P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<FONT FACE="Garamond, serif"><B>Description: </B>For a certain
students set: The purpose is that a certain interval not be scheduled
more than n times in a week (for example, there must be only 2
occupied intervals between hours 3 and 6, which might be on Monday
and on Tuesday. Quite a difficult and long name. A user needed a
constraint to disallow more than 2 afternoons per week for a students
set. This constraint is more general. You can specify an interval (by
the start and end hour), a students set and the maximum number of
days in a week when it is permitted to have activities in this time
interval.</FONT></P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<BR>
</P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<BR>
</P>
<P ALIGN=LEFT><FONT FACE="Garamond, serif">ConstraintStudentsSetNHoursDaily</FONT></P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<BR>
</P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<FONT FACE="Garamond, serif"><B>Subtags: </B>Weight, Compulsory,
MaxHoursDaily, MinHoursDaily, Students</FONT></P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<BR>
</P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<FONT FACE="Garamond, serif"><B>Description: </B>The result is a
timetable respecting the condition that this students set must not
have too little or too much hours in a day.</FONT></P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<BR>
</P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<BR>
</P>
<P ALIGN=LEFT><FONT FACE="Garamond, serif">ConstraintStudentsSetNoGaps</FONT></P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<BR>
</P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<FONT FACE="Garamond, serif"><B>Subtags: </B>Weight, Compulsory,
Students</FONT></P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<BR>
</P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<FONT FACE="Garamond, serif"><B>Description: </B>It adds, to the
fitness of the chromosome, a conflicts factor computed from the gaps
existing in the timetable (regarding the specified students set).</FONT></P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<BR>
</P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<BR>
</P>
<P ALIGN=LEFT><FONT FACE="Garamond, serif">ConstraintStudentsSetNotAvailable</FONT></P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<BR>
</P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<FONT FACE="Garamond, serif"><B>Subtags: </B>Weight, Compulsory,
Students, Day, Start_Hour, End_Hour</FONT></P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<BR>
</P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<FONT FACE="Garamond, serif"><B>Description: </B>It returns a fitness
factor equal to the product of this restriction's weight and the
number of conflicting hours for each students' set (hours when it is
not available, but a course is scheduled at that time). For the
moment, this is done for a certain day and an hour interval. (on day
"Day", between hours "Start_Hour" and
"End_Hour").</FONT></P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<BR>
</P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<BR>
</P>
<P ALIGN=LEFT><FONT FACE="Garamond, serif">ConstraintTeacherMaxDaysPerWeek</FONT></P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<BR>
</P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<FONT FACE="Garamond, serif"><B>Subtags: </B>Weight, Compulsory,
Teacher_Name, Max_Days_Per_Week</FONT></P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<BR>
</P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<FONT FACE="Garamond, serif"><B>Description: </B>The resulting
timetable must respect the requirement that this teacher must not
have too much working days per week.</FONT></P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<BR>
</P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<BR>
</P>
<P ALIGN=LEFT><FONT FACE="Garamond, serif">ConstraintTeacherNotAvailable</FONT></P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<BR>
</P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<FONT FACE="Garamond, serif"><B>Subtags: </B>Weight, Compulsory,
Teacher_Name, Day, Start_Hour, End_Hour</FONT></P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<BR>
</P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<FONT FACE="Garamond, serif"><B>Description: </B>It returns a fitness
factor a number equal to the product of this restriction's weight and
the number of conflicting hours for each teacher (hours when he is
not available, but a course is scheduled at that time). For the
moment, this is done for a certain day and an hour interval. (For
teacher "Teacher_Name", on day "Day", between
hours "Start_Hour" and "End_Hour").</FONT></P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<BR>
</P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<BR>
</P>
<P ALIGN=LEFT><FONT FACE="Garamond, serif">ConstraintTeachersNoGaps</FONT></P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<BR>
</P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<FONT FACE="Garamond, serif"><B>Subtags: </B>Weight, Compulsory</FONT></P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<BR>
</P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<FONT FACE="Garamond, serif"><B>Description: </B>It adds, to the
fitness of the chromosome, a conflicts factor computed from the gaps
existing in the timetable (regarding the teachers). The overall
result is a timetable having less gaps for the teachers.</FONT></P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<BR>
</P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<BR>
</P>
<P ALIGN=LEFT><FONT FACE="Garamond, serif">ConstraintTeachersMaxHoursContinuously</FONT></P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<BR>
</P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<FONT FACE="Garamond, serif"><B>Subtags: </B>Weight, Compulsory,
Maximum_Hours_Continuously</FONT></P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<BR>
</P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<FONT FACE="Garamond, serif"><B>Description: </B>This is a
constraint, aimed at obtaining timetables which do not allow more
than "Maximum_Hours_Continuously" hours in a row for any
teacher.</FONT></P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<BR>
</P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<BR>
</P>
<P ALIGN=LEFT><FONT FACE="Garamond, serif">ConstraintTeachersMaxHoursDaily</FONT></P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<BR>
</P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<FONT FACE="Garamond, serif"><B>Subtags: </B>Weight, Compulsory,
Maximum_Hours_Daily</FONT></P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<BR>
</P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<FONT FACE="Garamond, serif"><B>Description: </B>This is a
constraint, aimed at obtaining timetables which do not allow more
than "Maximum_Hours_Daily" hours in a day for any teacher.</FONT></P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<BR>
</P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<BR>
</P>
<P ALIGN=LEFT><FONT FACE="Garamond, serif">ConstraintTeachersSubgroupsMaxHoursDaily</FONT></P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<BR>
</P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<FONT FACE="Garamond, serif"><B>Subtags: </B>Weight, Compulsory,
Maximum_Hours_Daily</FONT></P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<BR>
</P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<FONT FACE="Garamond, serif"><B>Description: </B>A constraint aimed
at obtaining timetables which do not allow for a certain teacher and
a certain subgroup more than X hours per day.</FONT></P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<BR>
</P>
<P>ConstraintTeachersSubjectTagMaxHoursContinuously</P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<BR>
</P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<FONT FACE="Garamond, serif"><B>Subtags: </B>Weight, Compulsory,
Maximum_Hours_Daily</FONT></P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<BR>
</P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<FONT FACE="Garamond, serif"><B>Description: </B>A constraint aimed
at obtaining timetables which do not allow for a certain teacher and
a certain group of subjects by tag more than X hours per day.</FONT></P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<BR>
</P>
<P>ConstraintTeachersSubjectTagsMaxHoursContinuously</P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<BR>
</P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<FONT FACE="Garamond, serif"><B>Subtags: </B>Weight, Compulsory,
Maximum_Hours_Daily</FONT></P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<BR>
</P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<FONT FACE="Garamond, serif"><B>Description: </B>A constraint aimed
at obtaining timetables which do not allow for a certain teacher and
a certain set of groups of subjects more than X hours per day.</FONT></P>
<P ALIGN=LEFT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in">
<BR>
</P>
<P ALIGN=RIGHT STYLE="margin-left: 0.75in; text-indent: -0.75in; margin-bottom: 0in; font-weight: medium">
<FONT FACE="Garamond, serif"><FONT SIZE=3>this documentation by
Daniel S.</FONT></FONT></P>
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