welcome helper fetch new memos

app/helpers/welcome_helper.rb

@@ -104,9 +104,10 @@ module WelcomeHelper
     # or
     searchStudent(project).count
   end
-  #To do
-  def find_new_forum_topics
-    
+  def find_new_forum_topics limit=9
+    activity = Redmine::Activity::Fetcher.new(nil)
+    activity.scope=['memos']
+    activity.events_welcome(nil, nil, {:limit => limit})
   end
 
   private