diff --git a/src/backend/Simulator.java b/src/backend/Simulator.java
index a8085d2..67218d4 100644
--- a/src/backend/Simulator.java
+++ b/src/backend/Simulator.java
@@ -12,13 +12,13 @@ public class Simulator extends Thread {
 	private final int LIFE_TYPE_NUM = 4;
 	//Conway Radius : 1
 	private final int LIFE_AREA_RADIUS = 1;
-	//Animal Neighborhood Radius : 5
+	//Animal Neighborhood Radius : 2
 	private final int ANIMAL_AREA_RADIUS = 2;
 	private ArrayList<Integer> fieldSurviveValues;
 	private ArrayList<Integer> fieldBirthValues;
 	
 	private ArrayList<Agent> agents;
-	
+	private ArrayList<Cell> cells;
 	private boolean stopFlag;
 	private boolean pauseFlag;
 	private boolean loopingBorder;
@@ -33,7 +33,7 @@ public class Simulator extends Thread {
 		pauseFlag=false;
 		loopingBorder=false;
 		clickActionFlag=false;
-
+		cells = new ArrayList<Cell>();
 		agents = new ArrayList<Agent>();
 		fieldBirthValues = new ArrayList<Integer>();
 		fieldSurviveValues = new ArrayList<Integer>();
@@ -263,6 +263,7 @@ public class Simulator extends Thread {
 	
 	public void setLoopDelay(int delay) {
 		//TODO : complete method
+		loopDelay=delay;
 	}
 	
 	public void toggleClickAction() {