diff --git a/che_close/join.php b/che_close/join.php
index c6980bcc..f20ba17b 100644
--- a/che_close/join.php
+++ b/che_close/join.php
@@ -1,7 +1,7 @@
 <?php
-include "lib.php";
-include "func.php";
-require("new_lib.php");
+require_once "lib.php";
+require_once "func.php";
+require_once("new_lib.php");
 
 $id = $_POST[id];
 $pw = $_POST[pw];
diff --git a/f_config/DB.php b/f_config/DB.php
index dc460849..58d04ce8 100644
--- a/f_config/DB.php
+++ b/f_config/DB.php
@@ -1,7 +1,7 @@
 <?php
 require_once('_common.php');
 require_once(ROOT.W.F_FUNC.W.'class._DB.php');
-require(ROOT.W.F_CONFIG.W.SETTING.PHP);
+require_once(ROOT.W.F_CONFIG.W.SETTING.PHP);
 
 if($SETTING->IsExist()) {
     $DB = new _DB($SETTING->DBHost(), $SETTING->DBId(), $SETTING->DBPw(), $SETTING->DBName());
diff --git a/f_config/DBS.php b/f_config/DBS.php
index 8221551d..6f95263f 100644
--- a/f_config/DBS.php
+++ b/f_config/DBS.php
@@ -1,7 +1,7 @@
 <?php
 require_once('_common.php');
 require_once(ROOT.W.F_FUNC.W.'class._DB.php');
-require(ROOT.W.F_CONFIG.W.'SETTINGS'.PHP);
+require_once(ROOT.W.F_CONFIG.W.'SETTINGS'.PHP);
 
 for($i=0; $i < $_serverCount; $i++) {
     if(!$SETTINGS[$i]->IsExist()) {
diff --git a/f_config/MAIL.php b/f_config/MAIL.php
index 1d043bde..9ababf2d 100644
--- a/f_config/MAIL.php
+++ b/f_config/MAIL.php
@@ -1,7 +1,7 @@
 <?php
 require_once('_common.php');
-require(ROOT.W.F_FUNC.W.'class._Mail.php');
-require(ROOT.W.F_CONFIG.W.SETTING.PHP);
+require_once(ROOT.W.F_FUNC.W.'class._Mail.php');
+require_once(ROOT.W.F_CONFIG.W.SETTING.PHP);
 
 if($SETTING->IsExist()) {
     $MAIL = new _Mail($SETTING->MailHost(), $SETTING->MailPort(), $SETTING->MailId(), $SETTING->MailPw(), $SETTING->MailAddr());
diff --git a/f_func/class._DB.php b/f_func/class._DB.php
index 6b931d29..3b7bc593 100644
--- a/f_func/class._DB.php
+++ b/f_func/class._DB.php
@@ -1,6 +1,6 @@
 <?php
 require_once('_common.php');
-require(ROOT.W.E_LIB.W.'adodb5/adodb.inc.php');
+require_once(ROOT.W.E_LIB.W.'adodb5/adodb.inc.php');
 
 class _DB {
     private $objDB;
diff --git a/f_func/class._Mail.php b/f_func/class._Mail.php
index dca2de21..9d218d20 100644
--- a/f_func/class._Mail.php
+++ b/f_func/class._Mail.php
@@ -1,6 +1,6 @@
 <?php
 require_once('_common.php');
-require(ROOT.W.E_LIB.W.'phpmailer5/class.phpmailer.php');
+require_once(ROOT.W.E_LIB.W.'phpmailer5/class.phpmailer.php');
 
 class _Mail {
     private $objMail;
diff --git a/f_func/class._Process.php b/f_func/class._Process.php
index c1e9f3f9..035845a5 100644
--- a/f_func/class._Process.php
+++ b/f_func/class._Process.php
@@ -1,7 +1,7 @@
 <?php
 require_once('_common.php');
 require_once(ROOT.'/f_config/config.php');
-require(ROOT.W.F_FUNC.W.'class._Lock.php');
+require_once(ROOT.W.F_FUNC.W.'class._Lock.php');
 
 class _Process {
     private static $mutexLog = false;
diff --git a/f_func/class._Validation.php b/f_func/class._Validation.php
index f3b61355..dbf4e7da 100644
--- a/f_func/class._Validation.php
+++ b/f_func/class._Validation.php
@@ -1,5 +1,5 @@
 <?php
-require(ROOT.W.F_FUNC.W.'class._String.php');
+require_once(ROOT.W.F_FUNC.W.'class._String.php');
 
 class _Validation {
     public static function CheckID($id) {
diff --git a/f_install/install1Post.php b/f_install/install1Post.php
index 2ca56e2d..f025ec74 100644
--- a/f_install/install1Post.php
+++ b/f_install/install1Post.php
@@ -12,7 +12,7 @@ $mailAddr = $_POST['mailAddr'];
 
 require_once('_common.php');
 require_once(ROOT.W.F_FUNC.W.'class._DB.php');
-require(ROOT.W.F_FUNC.W.'class._String.php');
+require_once(ROOT.W.F_FUNC.W.'class._String.php');
 
 if(file_exists(ROOT.W.D_SETTING.W.SET.PHP)) ErrorToScreen('이미 설치되어 있습니다. 재설치하려면 설정 파일을 지우세요.');
 if(fileperms(ROOT.W.D_SETTING.W) != 040707 && fileperms(ROOT.W.D_SETTING.W) != 040777) ErrorToScreen('설정 디렉토리 권한을 707 또는 777로 설정해주세요.');
diff --git a/f_install/install2Post.php b/f_install/install2Post.php
index 01311af9..99579b67 100644
--- a/f_install/install2Post.php
+++ b/f_install/install2Post.php
@@ -5,7 +5,7 @@ $pw = $_POST['pw'];
 $pw = md5($pw.$pw);
 
 require_once('_common.php');
-require(ROOT.W.F_FUNC.W.'class._Time.php');
+require_once(ROOT.W.F_FUNC.W.'class._Time.php');
 require_once(ROOT.W.F_CONFIG.W.DB.PHP);
 
 // 시스템정보 1개 등록
diff --git a/i_entrance/adminPost.php b/i_entrance/adminPost.php
index 15e0875e..1fac1098 100644
--- a/i_entrance/adminPost.php
+++ b/i_entrance/adminPost.php
@@ -6,8 +6,8 @@
 // $_POST['select'] : 0: 폐쇄, 1: 리셋, 2: 오픈
 
 require_once('_common.php');
-require(ROOT.W.E_LIB.W.'util.php');
-require(ROOT.W.E_LIB.W.'plates.php');
+require_once(ROOT.W.E_LIB.W.'util.php');
+require_once(ROOT.W.E_LIB.W.'plates.php');
 require_once(ROOT.W.F_FUNC.W.'class._JSON.php');
 require_once(ROOT.W.F_CONFIG.W.DB.PHP);
 require_once(ROOT.W.F_CONFIG.W.SESSION.PHP);
diff --git a/i_entrance/donation/Get.php b/i_entrance/donation/Get.php
index e3507ff4..629556b8 100644
--- a/i_entrance/donation/Get.php
+++ b/i_entrance/donation/Get.php
@@ -3,7 +3,7 @@
 
 require_once('_common.php');
 require_once(ROOT.W.F_FUNC.W.'class._JSON.php');
-require(ROOT.W.F_FUNC.W.'class._Time.php');
+require_once(ROOT.W.F_FUNC.W.'class._Time.php');
 require_once(ROOT.W.F_CONFIG.W.DB.PHP);
 require_once(ROOT.W.F_CONFIG.W.SESSION.PHP);
 
diff --git a/i_entrance/manage/deletePost.php b/i_entrance/manage/deletePost.php
index 28c3cf04..aa08f78c 100644
--- a/i_entrance/manage/deletePost.php
+++ b/i_entrance/manage/deletePost.php
@@ -4,8 +4,8 @@
 require_once('_common.php');
 require_once(ROOT.W.F_FUNC.W.'class._JSON.php');
 require_once(ROOT.W.F_CONFIG.W.DB.PHP);
-require(ROOT.W.F_CONFIG.W.'DBS'.PHP);
-require(ROOT.W.F_CONFIG.W.SETTINGS.PHP);
+require_once(ROOT.W.F_CONFIG.W.'DBS'.PHP);
+require_once(ROOT.W.F_CONFIG.W.SETTINGS.PHP);
 require_once(ROOT.W.F_CONFIG.W.SESSION.PHP);
 
 $dest = ROOT.W.D."pic/pic_{$SESSION->NoMember()}.jpg";
diff --git a/i_entrance/manage/iconPost.php b/i_entrance/manage/iconPost.php
index a5a79db2..a77e3e20 100644
--- a/i_entrance/manage/iconPost.php
+++ b/i_entrance/manage/iconPost.php
@@ -4,8 +4,8 @@
 
 require_once('_common.php');
 require_once(ROOT.W.F_CONFIG.W.DB.PHP);
-require(ROOT.W.F_CONFIG.W.'DBS'.PHP);
-require(ROOT.W.F_CONFIG.W.SETTINGS.PHP);
+require_once(ROOT.W.F_CONFIG.W.'DBS'.PHP);
+require_once(ROOT.W.F_CONFIG.W.SETTINGS.PHP);
 require_once(ROOT.W.F_CONFIG.W.SESSION.PHP);
 
 $image = $_FILES['picture'];
diff --git a/i_entrance/manage/passwordPost.php b/i_entrance/manage/passwordPost.php
index 6a0d03f4..b0715c75 100644
--- a/i_entrance/manage/passwordPost.php
+++ b/i_entrance/manage/passwordPost.php
@@ -8,8 +8,8 @@ $newPw = $_POST['newPw'];
 require_once('_common.php');
 require_once(ROOT.W.F_FUNC.W.'class._JSON.php');
 require_once(ROOT.W.F_CONFIG.W.DB.PHP);
-require(ROOT.W.F_CONFIG.W.'DBS'.PHP);
-require(ROOT.W.F_CONFIG.W.SETTINGS.PHP);
+require_once(ROOT.W.F_CONFIG.W.'DBS'.PHP);
+require_once(ROOT.W.F_CONFIG.W.SETTINGS.PHP);
 require_once(ROOT.W.F_CONFIG.W.SESSION.PHP);
 
 $response['result'] = 'FAIL';
diff --git a/i_entrance/manage/quitPost.php b/i_entrance/manage/quitPost.php
index 1d68afdf..d3e1f51f 100644
--- a/i_entrance/manage/quitPost.php
+++ b/i_entrance/manage/quitPost.php
@@ -5,7 +5,7 @@ $pw = $_POST['pw'];
 
 require_once('_common.php');
 require_once(ROOT.W.F_FUNC.W.'class._JSON.php');
-require(ROOT.W.F_FUNC.W.'class._Time.php');
+require_once(ROOT.W.F_FUNC.W.'class._Time.php');
 require_once(ROOT.W.F_CONFIG.W.DB.PHP);
 require_once(ROOT.W.F_CONFIG.W.SESSION.PHP);
 
diff --git a/i_entrance/member/Post.php b/i_entrance/member/Post.php
index 8368fb1d..5f751122 100644
--- a/i_entrance/member/Post.php
+++ b/i_entrance/member/Post.php
@@ -8,8 +8,8 @@ $no = $_POST['no'];
 require_once('_common.php');
 require_once(ROOT.W.F_FUNC.W.'class._JSON.php');
 require_once(ROOT.W.F_CONFIG.W.DB.PHP);
-require(ROOT.W.F_CONFIG.W.'DBS'.PHP);
-require(ROOT.W.F_CONFIG.W.SETTINGS.PHP);
+require_once(ROOT.W.F_CONFIG.W.'DBS'.PHP);
+require_once(ROOT.W.F_CONFIG.W.SETTINGS.PHP);
 require_once(ROOT.W.F_CONFIG.W.SESSION.PHP);
 
 $rs = $DB->Select('GRADE', 'MEMBER', "NO='{$SESSION->NoMember()}'");
diff --git a/i_entrance/serverListPost.php b/i_entrance/serverListPost.php
index e2b496b6..f6d8f2a3 100644
--- a/i_entrance/serverListPost.php
+++ b/i_entrance/serverListPost.php
@@ -4,8 +4,8 @@
 require_once('_common.php');
 require_once(ROOT.W.F_FUNC.W.'class._JSON.php');
 require_once(ROOT.W.F_CONFIG.W.DB.PHP);
-require(ROOT.W.F_CONFIG.W.DBS.PHP);
-require(ROOT.W.F_CONFIG.W.SETTINGS.PHP);
+require_once(ROOT.W.F_CONFIG.W.DBS.PHP);
+require_once(ROOT.W.F_CONFIG.W.SETTINGS.PHP);
 require_once(ROOT.W.F_CONFIG.W.SESSION.PHP);
 
 $rs = $DB->Select('ID, GRADE', 'MEMBER', "NO='{$SESSION->NoMember()}'");
diff --git a/i_login/Post.php b/i_login/Post.php
index 915eb693..6043d352 100644
--- a/i_login/Post.php
+++ b/i_login/Post.php
@@ -10,7 +10,7 @@ $conmsg = $_POST['conmsg'];
 require_once('_common.php');
 require_once(ROOT.W.F_FUNC.W.'class._JSON.php');
 require_once(ROOT.W.F_FUNC.W.'class._Session.php');
-require(ROOT.W.F_FUNC.W.'class._String.php');
+require_once(ROOT.W.F_FUNC.W.'class._String.php');
 require_once(ROOT.W.F_CONFIG.W.DB.PHP);
 
 $id = _String::NoSpecialCharacter($id);
diff --git a/i_login/findpw/Post.php b/i_login/findpw/Post.php
index d7d70a63..9e80a86e 100644
--- a/i_login/findpw/Post.php
+++ b/i_login/findpw/Post.php
@@ -12,9 +12,9 @@ $email = $_POST['email'];
 
 require_once('_common.php');
 require_once(ROOT.W.F_FUNC.W.'class._JSON.php');
-require(ROOT.W.F_FUNC.W.'class._Time.php');
-require(ROOT.W.F_FUNC.W.'class._String.php');
-require(ROOT.W.F_FUNC.W.'class._Validation.php');
+require_once(ROOT.W.F_FUNC.W.'class._Time.php');
+require_once(ROOT.W.F_FUNC.W.'class._String.php');
+require_once(ROOT.W.F_FUNC.W.'class._Validation.php');
 require_once(ROOT.W.F_CONFIG.W.DB.PHP);
 
 $response['result'] = 'FAIL';
diff --git a/i_login/findpw/checkPost.php b/i_login/findpw/checkPost.php
index c207aded..630abcb1 100644
--- a/i_login/findpw/checkPost.php
+++ b/i_login/findpw/checkPost.php
@@ -14,8 +14,8 @@ $email = $_POST['email'];
 
 require_once('_common.php');
 require_once(ROOT.W.F_FUNC.W.'class._JSON.php');
-require(ROOT.W.F_FUNC.W.'class._String.php');
-require(ROOT.W.F_FUNC.W.'class._Validation.php');
+require_once(ROOT.W.F_FUNC.W.'class._String.php');
+require_once(ROOT.W.F_FUNC.W.'class._Validation.php');
 require_once(ROOT.W.F_CONFIG.W.DB.PHP);
 
 $response['type'] = $type;
diff --git a/i_login/findpw/sendCodePost.php b/i_login/findpw/sendCodePost.php
index 1a1caf91..e062ef40 100644
--- a/i_login/findpw/sendCodePost.php
+++ b/i_login/findpw/sendCodePost.php
@@ -5,11 +5,11 @@ $email = $_POST['email'];
 
 require_once('_common.php');
 require_once(ROOT.W.F_FUNC.W.'class._JSON.php');
-require(ROOT.W.F_FUNC.W.'class._String.php');
-require(ROOT.W.F_FUNC.W.'class._Validation.php');
-require(ROOT.W.F_FUNC.W.'class._Time.php');
+require_once(ROOT.W.F_FUNC.W.'class._String.php');
+require_once(ROOT.W.F_FUNC.W.'class._Validation.php');
+require_once(ROOT.W.F_FUNC.W.'class._Time.php');
 require_once(ROOT.W.F_CONFIG.W.DB.PHP);
-require(ROOT.W.F_CONFIG.W.'MAIL'.PHP);
+require_once(ROOT.W.F_CONFIG.W.'MAIL'.PHP);
 
 $response['result'] = 'FAIL';
 
diff --git a/i_login/findpw/verifyCodePost.php b/i_login/findpw/verifyCodePost.php
index c4621900..9926eaa9 100644
--- a/i_login/findpw/verifyCodePost.php
+++ b/i_login/findpw/verifyCodePost.php
@@ -7,8 +7,8 @@ $code = $_POST['code'];
 
 require_once('_common.php');
 require_once(ROOT.W.F_FUNC.W.'class._JSON.php');
-require(ROOT.W.F_FUNC.W.'class._Validation.php');
-require(ROOT.W.F_FUNC.W.'class._Time.php');
+require_once(ROOT.W.F_FUNC.W.'class._Validation.php');
+require_once(ROOT.W.F_FUNC.W.'class._Time.php');
 require_once(ROOT.W.F_CONFIG.W.DB.PHP);
 
 $response['result'] = 'FAIL';
diff --git a/i_login/join/Post.php b/i_login/join/Post.php
index e2f8f20f..ace78906 100644
--- a/i_login/join/Post.php
+++ b/i_login/join/Post.php
@@ -18,9 +18,9 @@ $pw = substr($pw, 0, 32);
 
 require_once('_common.php');
 require_once(ROOT.W.F_FUNC.W.'class._JSON.php');
-require(ROOT.W.F_FUNC.W.'class._Time.php');
-require(ROOT.W.F_FUNC.W.'class._String.php');
-require(ROOT.W.F_FUNC.W.'class._Validation.php');
+require_once(ROOT.W.F_FUNC.W.'class._Time.php');
+require_once(ROOT.W.F_FUNC.W.'class._String.php');
+require_once(ROOT.W.F_FUNC.W.'class._Validation.php');
 require_once(ROOT.W.F_CONFIG.W.DB.PHP);
 
 $name = _String::NoSpecialCharacter($name);
diff --git a/i_login/join/checkPost.php b/i_login/join/checkPost.php
index 92c8b10c..44cae098 100644
--- a/i_login/join/checkPost.php
+++ b/i_login/join/checkPost.php
@@ -16,8 +16,8 @@ $email = $_POST['email'];
 
 require_once('_common.php');
 require_once(ROOT.W.F_FUNC.W.'class._JSON.php');
-require(ROOT.W.F_FUNC.W.'class._String.php');
-require(ROOT.W.F_FUNC.W.'class._Validation.php');
+require_once(ROOT.W.F_FUNC.W.'class._String.php');
+require_once(ROOT.W.F_FUNC.W.'class._Validation.php');
 require_once(ROOT.W.F_CONFIG.W.DB.PHP);
 
 $name = _String::NoSpecialCharacter($name);
diff --git a/i_login/join/sendCodePost.php b/i_login/join/sendCodePost.php
index 8935155f..5c74adfe 100644
--- a/i_login/join/sendCodePost.php
+++ b/i_login/join/sendCodePost.php
@@ -5,11 +5,11 @@ $email = $_POST['email'];
 
 require_once('_common.php');
 require_once(ROOT.W.F_FUNC.W.'class._JSON.php');
-require(ROOT.W.F_FUNC.W.'class._String.php');
-require(ROOT.W.F_FUNC.W.'class._Validation.php');
-require(ROOT.W.F_FUNC.W.'class._Time.php');
+require_once(ROOT.W.F_FUNC.W.'class._String.php');
+require_once(ROOT.W.F_FUNC.W.'class._Validation.php');
+require_once(ROOT.W.F_FUNC.W.'class._Time.php');
 require_once(ROOT.W.F_CONFIG.W.DB.PHP);
-require(ROOT.W.F_CONFIG.W.'MAIL'.PHP);
+require_once(ROOT.W.F_CONFIG.W.'MAIL'.PHP);
 
 $response['result'] = 'FAIL';
 
diff --git a/i_login/join/verifyCodePost.php b/i_login/join/verifyCodePost.php
index c4621900..9926eaa9 100644
--- a/i_login/join/verifyCodePost.php
+++ b/i_login/join/verifyCodePost.php
@@ -7,8 +7,8 @@ $code = $_POST['code'];
 
 require_once('_common.php');
 require_once(ROOT.W.F_FUNC.W.'class._JSON.php');
-require(ROOT.W.F_FUNC.W.'class._Validation.php');
-require(ROOT.W.F_FUNC.W.'class._Time.php');
+require_once(ROOT.W.F_FUNC.W.'class._Validation.php');
+require_once(ROOT.W.F_FUNC.W.'class._Time.php');
 require_once(ROOT.W.F_CONFIG.W.DB.PHP);
 
 $response['result'] = 'FAIL';