plot for the paper added

research_problem_overview_new_version_for_the_paper.graphml

@@ -1210,6 +1210,18 @@ core<y:LabelModel><y:SmartNodeLabelModel distance="4.0"/></y:LabelModel><y:Model
         </y:ShapeNode>
       </data>
     </node>
+    <node id="n79">
+      <data key="d6">
+        <y:ShapeNode>
+          <y:Geometry height="72.0" width="20.0" x="689.0" y="427.25"/>
+          <y:Fill hasColor="false" transparent="false"/>
+          <y:BorderStyle hasColor="false" raised="false" type="line" width="1.0"/>
+          <y:NodeLabel alignment="center" autoSizePolicy="content" fontFamily="Dialog" fontSize="18" fontStyle="bold" hasBackgroundColor="false" hasLineColor="false" height="45.90625" horizontalTextPosition="center" iconTextGap="4" modelName="custom" textColor="#000000" verticalTextPosition="bottom" visible="true" width="48.12109375" x="-14.060546875" xml:space="preserve" y="22.09375">Big
+core<y:LabelModel><y:SmartNodeLabelModel distance="4.0"/></y:LabelModel><y:ModelParameter><y:SmartNodeLabelModelParameter labelRatioX="0.0" labelRatioY="0.5" nodeRatioX="0.0" nodeRatioY="0.5" offsetX="0.0" offsetY="-4.0" upX="0.0" upY="-1.0"/></y:ModelParameter></y:NodeLabel>
+          <y:Shape type="rectangle"/>
+        </y:ShapeNode>
+      </data>
+    </node>
     <edge id="e0" source="n11" target="n12">
       <data key="d9"/>
       <data key="d10">