--- a/src/alice/topology/manager/keeparive/PingScheduler.java	Mon Nov 11 16:25:55 2013 +0900
+++ b/src/alice/topology/manager/keeparive/PingScheduler.java	Mon Nov 11 17:13:41 2013 +0900
@@ -13,12 +13,12 @@
 	
 	public boolean updateFlag = false;
 	private boolean postponeFlag = false;
-	private boolean nowTaskFlag = false;
 	
 	public long time = 0;
 	public int taskNum = 0;
 	public TaskInfo nowTask;
 	private long totalTime = 0;
+	private long postponeTime = 0;
 	
 	public long getTotalTime(){
 		return totalTime;
@@ -29,11 +29,14 @@
 	}
 	
 	public synchronized void postpone(String name){
-		long postponeTime = nowTask.getTime() - (System.currentTimeMillis() - time);
+		long elapsedTime = System.currentTimeMillis() - time;
+		totalTime += elapsedTime;
+		postponeTime = nowTask.getTime() - elapsedTime;
 		if (name.equals(nowTask.getName())){
 			TaskInfo nextTask = list.get(0);
 			nextTask.setTime(postponeTime + nextTask.getTime());
-			nowTaskFlag = true;
+			nowTask.setTime(INTERVAL);
+			addTask(nowTask);
 		} else {
 			for (int cnt = 0 ;cnt < list.size();  cnt++){
 				TaskInfo task = list.get(cnt);
@@ -45,11 +48,11 @@
 					list.remove(cnt);
 					task.setTime(INTERVAL);
 					addTask(task);
+					postponeFlag = true;
 					break;
 				}
 			}
 		}
-		postponeFlag = true;
 		notify();
 	}
 	
@@ -99,16 +102,9 @@
 				if (nowTask.getTime()!=0)
 					this.wait(nowTask.getTime());
 				if (postponeFlag){
-					long remainingTime = nowTask.getTime() - (System.currentTimeMillis() - time);
-					totalTime += (System.currentTimeMillis() - time);
-					if (nowTaskFlag){
-						nowTask.setTime(INTERVAL);
-						addTask(nowTask);
-					} else {
-						nowTask.setTime(remainingTime);
-						list.add(0, nowTask);
-						updateFlag = true;						
-					}
+					nowTask.setTime(postponeTime);
+					list.add(0, nowTask);
+					updateFlag = true;					
 					postponeFlag = false;
 				} else {
 					totalTime +=nowTask.getTime();