diff --git a/src/sammo/AppConf.php b/src/sammo/AppConf.php
index 874c9f18..aaa04435 100644
--- a/src/sammo/AppConf.php
+++ b/src/sammo/AppConf.php
@@ -1,10 +1,6 @@
 <?php
 namespace sammo;
 
-if(!defined('ROOT')){
-    define('ROOT', '../..');
-}
-
 class AppConf{
     private static $serverList = null;
 
diff --git a/src/sammo/Lock.php b/src/sammo/Lock.php
index fa2aed00..36fcc213 100644
--- a/src/sammo/Lock.php
+++ b/src/sammo/Lock.php
@@ -1,9 +1,6 @@
 <?php
 namespace sammo;
 
-if(!defined('ROOT')){
-    define('ROOT', '../..');
-}
 class Lock {
     private static $l = ROOT.'/d_log/lock.txt';
 
diff --git a/src/sammo/Session.php b/src/sammo/Session.php
index 181b24a9..a590b15f 100644
--- a/src/sammo/Session.php
+++ b/src/sammo/Session.php
@@ -1,10 +1,6 @@
 <?php
 namespace sammo;
 
-if(!defined('ROOT')){
-    define('ROOT', '../..');
-}
-
 /**
  * Session Wrapper. 내부적으로 $_SESSION을 이용
  * 
diff --git a/src/sammo/Util.php b/src/sammo/Util.php
index 2ee61211..713c061c 100644
--- a/src/sammo/Util.php
+++ b/src/sammo/Util.php
@@ -42,7 +42,10 @@ class Util extends \utilphp\util{
      * 
      * @return int|null
      */
-    public static function toInt($val, $force=false){
+    public static function toInt($val, $silent=false){
+        if(!isset($val)){
+            return null;
+        }
         if($val === null){
             return null;
         }
@@ -56,7 +59,10 @@ class Util extends \utilphp\util{
             return null;
         }
 
-        if($force){
+        if($silent){
+            if($val == null){
+                return null;
+            }
             return intval($val);
         }
         throw new InvalidArgumentException('올바르지 않은 타입형 :'.$val);