diff --git a/library.properties b/library.properties
index f86bed8..43bf496 100644
--- a/library.properties
+++ b/library.properties
@@ -1,8 +1,8 @@
 name=Dynamixel2Arduino
-version=0.7.0
+version=0.8.0
 author=ROBOTIS
 license=Apache-2.0
-maintainer=HongHyun Kim(khh@robotis.com)
+maintainer=Sookyung Son(sukaa@robotis.com)
 sentence=DYNAMIXEL protocol Library for Arduino
 paragraph=This library helps the Arduino boards to communicate with DYNAMIXEL protocol.
 category=Communication
diff --git a/src/dxl_c/protocol.cpp b/src/dxl_c/protocol.cpp
index 7d7d220..51804e0 100644
--- a/src/dxl_c/protocol.cpp
+++ b/src/dxl_c/protocol.cpp
@@ -12,6 +12,7 @@
   #define pgm_read_word_near(x) (*(uint16_t*)(x))
 #endif
 
+using namespace DYNAMIXEL; 
 
 // 2.0 Protocol
 #define DXL2_0_PACKET_IDX_HEADER_1        0
diff --git a/src/dxl_c/protocol.h b/src/dxl_c/protocol.h
index 95cdbac..6a99801 100644
--- a/src/dxl_c/protocol.h
+++ b/src/dxl_c/protocol.h
@@ -97,9 +97,7 @@ struct InfoBulkWriteInst_t {
   InfoSyncBulkBuffer_t packet;
 } __attribute__((packed));
 
-}
-
-using namespace DYNAMIXEL;
+} // namespace DYNAMIXEL
 
 #ifdef __cplusplus
 extern "C" {
@@ -258,7 +256,7 @@ DXLLibErrorCode_t parse_dxl_packet(InfoToParseDXLPacket_t* p_parse_packet, uint8
 DXLLibErrorCode_t fast_begin_parse_dxl_packet(InfoToParseDXLPacket_t* p_parse_packet, 
   uint8_t protocol_ver);//, uint8_t* p_param_buf, uint16_t param_buf_cap, uint8_t xel_count);
 DXLLibErrorCode_t fast_parse_dxl_packet(InfoToParseDXLPacket_t* p_parse_packet, uint8_t recv_data,
-                                        InfoSyncReadInst_t *sync_read, InfoBulkReadInst_t *bulk_read);
+                                        DYNAMIXEL::InfoSyncReadInst_t *sync_read, DYNAMIXEL::InfoBulkReadInst_t *bulk_read);
 
 #ifdef __cplusplus
 }