diff --git a/Gemfile b/Gemfile
index 350e290dc..2bdb68efb 100644
--- a/Gemfile
+++ b/Gemfile
@@ -18,6 +18,7 @@ gem 'kaminari'
 gem 'time_difference'
 gem "acts_as_unvlogable"
 gem 'youtube_it'
+gem 'whenever', :require => false
 
 # gem "memcached", "~> 1.4.3"
 # gem "memcache-client"
diff --git a/app/controllers/admin/import_data_controller.rb b/app/controllers/admin/import_data_controller.rb
index 825f591d3..5c141aa32 100644
--- a/app/controllers/admin/import_data_controller.rb
+++ b/app/controllers/admin/import_data_controller.rb
@@ -259,13 +259,15 @@ class Admin::ImportDataController < OrbitBackendController
   end
 
  def sync_conference_data
-    @conference_data = WritingConference.where(create_user_id: "#{params[:user_id]}")
+  @user = User.all
+  @user.each do |user|
+    @conference_data = WritingConference.where(create_user_id: "#{user.id}")
     @conference_data.delete_all
-    @user = User.find("#{params[:user_id]}")
+    # @user = User.find("#{params[:user_id]}")
 
     # teachers.each do |hash|
-     if @user.sid.present?
-    ntu_seq = @user.sid
+     if user.sid.present?
+    ntu_seq = user.sid
     conference_xml = Nokogiri::XML( \
     open("http://ann.cc.ntu.edu.tw/Achv/xmlPaper.asp?Seq=#{ntu_seq}&type=C"))
         #open("http://versatile.management.ntu.edu.tw/publication1/conference/#{ntuseq}.xml"))
@@ -314,7 +316,7 @@ class Admin::ImportDataController < OrbitBackendController
 
        @conference_paper.location = b[:location]
        @conference_paper.year = b[:year]
-       @conference_paper.create_user_id = @user.id
+       @conference_paper.create_user_id = user.id
 
        @conference_paper.save!
      end
@@ -322,23 +324,20 @@ class Admin::ImportDataController < OrbitBackendController
     puts "No conference by Teacher"
       end
       end
-       respond_to do |format|
-    
-        format.html
-        format.json { render json: {"success"=>true}.to_json}
-      
-      end
+    end
   end
 
 
-  def sync_journal_paper_data
-    @journal_data = WritingJournal.where(create_user_id: "#{params[:user_id]}")
+def sync_journal_paper_data
+  @user = User.all
+  @user.each do |user|
+    @journal_data = WritingJournal.where(create_user_id: "#{user_id}")
     @journal_data.delete_all
-    @user = User.find("#{params[:user_id]}")
+    # @user = User.find("#{params[:user_id]}")
 
     # teachers.each do |hash|
-    if @user.sid.present?
-      ntu_seq = @user.sid
+    if user.sid.present?
+      ntu_seq = user.sid
       paper_xml = Nokogiri::XML( \
           #open("http://versatile.management.ntu.edu.tw/publication1/journal/#{ntuseq}.xml"))
       open("http://ann.cc.ntu.edu.tw/Achv/xmlPaper.asp?Seq=#{ntu_seq}&type=J"))
@@ -394,28 +393,25 @@ class Admin::ImportDataController < OrbitBackendController
             end
            end
 
-           @journal_paper.create_user_id = @user.id
+           @journal_paper.create_user_id = user.id
            @journal_paper.save!
         end
       end
      
     end
-     respond_to do |format|
-    
-        format.html
-        format.json { render json: {"success"=>true}.to_json}
-      
-      end
-  end
+  end   
+end
 
 def sync_book_data
-    @books_data = WritingBook.where(create_user_id: "#{params[:user_id]}")
+  @user = User.all
+  @user.each do |user|
+    @books_data = WritingBook.where(create_user_id: "#{user_id}")
     @books_data.delete_all
-    @user = User.find("#{params[:user_id]}")
+    # @user = User.find("#{params[:user_id]}")
 
     # teachers.each do |hash|
-     if @user.sid.present?
-    ntu_seq = @user.sid
+     if user.sid.present?
+    ntu_seq = user.sid
     books_xml = Nokogiri::XML( \
     open("http://ann.cc.ntu.edu.tw/Achv/xmlBook.asp?Seq=#{ntu_seq}"))
     @books = books_xml.xpath("//Book").map do |book_node|
@@ -444,18 +440,13 @@ def sync_book_data
      @book.note = b[:remarks]
      @book.publisher = b[:publisher]
      @book.year = b[:year]
-     @book.create_user_id = @user.id
+     @book.create_user_id = user.id
      @book.save
      end
     end
      end
-     respond_to do |format|
-    
-        format.html
-        format.json { render json: {"success"=>true}.to_json}
-      
-      end
   end
+end
 
 
   def get_announcement_data
diff --git a/config/schedule.rb b/config/schedule.rb
new file mode 100644
index 000000000..bfefe33b5
--- /dev/null
+++ b/config/schedule.rb
@@ -0,0 +1,20 @@
+# Use this file to easily define all of your cron jobs.
+#
+# It's helpful, but not entirely necessary to understand cron before proceeding.
+# http://en.wikipedia.org/wiki/Cron
+
+# Example:
+#
+# set :output, "/path/to/my/cron_log.log"
+#
+ every 1.day, :at => '11:00 pm' do
+#   command "/usr/bin/some_great_command"
+#   runner "MyModel.some_method"
+   	rake "rake synchronize:data"
+ end
+#
+# every 4.days do
+#   runner "AnotherModel.prune_old_records"
+# end
+
+# Learn more: http://github.com/javan/whenever
diff --git a/lib/tasks/synchronize.rake b/lib/tasks/synchronize.rake
new file mode 100644
index 000000000..8b5e58bde
--- /dev/null
+++ b/lib/tasks/synchronize.rake
@@ -0,0 +1,12 @@
+# encoding: utf-8 
+namespace :synchronize do
+ desc "synchronize tasks"
+ task :data => :environment do
+   	p Admin::ImportDataController.new.sync_book_data
+   	puts "Book Data Synchronization Complete"
+   	p Admin::ImportDataController.new.sync_journal_paper_data
+   	puts "Journal Paper Data Synchronization Complete"
+   	p Admin::ImportDataController.new.sync_conference_data
+   	puts "Conference Data Synchronization Complete"
+ end
+end
\ No newline at end of file
diff --git a/vendor/built_in_modules/personal_conference/app/models/writing_conference.rb b/vendor/built_in_modules/personal_conference/app/models/writing_conference.rb
index c6a708869..b0c6d8f2f 100644
--- a/vendor/built_in_modules/personal_conference/app/models/writing_conference.rb
+++ b/vendor/built_in_modules/personal_conference/app/models/writing_conference.rb
@@ -91,7 +91,6 @@ class WritingConference
     title << "#{period_start_date}-#{period_end_date}" if (self.period_start_date.present? &&  self.period_end_date.present?)
     # title << "(#{self.conference_paper_types.collect{|x| x.title}.join(', ')})"
     title.join(', ')
-
   end
 
   protected