diff --git a/src/main/java/com/loafle/overflow/module/commons/OFService.java b/src/main/java/com/loafle/overflow/module/commons/OFService.java
deleted file mode 100644
index d28c451..0000000
--- a/src/main/java/com/loafle/overflow/module/commons/OFService.java
+++ /dev/null
@@ -1,21 +0,0 @@
-package com.loafle.overflow.module.commons;
-
-import org.codehaus.jackson.map.ObjectMapper;
-import org.springframework.beans.factory.annotation.Autowired;
-
-/**
- * Created by insanity on 17. 6. 28.
- */
-public class OFService {
-
-    @Autowired
-    private ObjectMapper mapper;
-
-    public String toString(Object o) {
-        try {
-            return mapper.writeValueAsString(o);
-        }catch(Exception e) {
-            return e.getMessage();
-        }
-    }
-}
diff --git a/src/main/java/com/loafle/overflow/module/sensor/service/SensorService.java b/src/main/java/com/loafle/overflow/module/sensor/service/SensorService.java
new file mode 100644
index 0000000..291daf2
--- /dev/null
+++ b/src/main/java/com/loafle/overflow/module/sensor/service/SensorService.java
@@ -0,0 +1,33 @@
+package com.loafle.overflow.module.sensor.service;
+
+import com.loafle.overflow.module.sensor.dao.SensorDAO;
+import com.loafle.overflow.module.sensor.model.Sensor;
+import com.loafle.overflow.module.target.model.Target;
+import org.springframework.beans.factory.annotation.Autowired;
+
+import java.util.List;
+
+/**
+ * Created by insanity on 17. 6. 28.
+ */
+public class SensorService  {
+
+    @Autowired
+    SensorDAO sensorDAO;
+
+    public Sensor regist(Sensor sensor) {
+        return this.sensorDAO.save(sensor);
+    }
+
+    public List<Sensor> readAllByTarget(Target target) {
+        return this.sensorDAO.findAllByTarget(target);
+    }
+
+    public Sensor read(String id) {
+        return this.sensorDAO.findOne(Long.valueOf(id));
+    }
+
+    public void remove(Sensor sensor) {
+        this.sensorDAO.delete(sensor);
+    }
+}
diff --git a/src/main/java/com/loafle/overflow/module/target/service/TargetService.java b/src/main/java/com/loafle/overflow/module/target/service/TargetService.java
index c8e809a..bca0f3e 100644
--- a/src/main/java/com/loafle/overflow/module/target/service/TargetService.java
+++ b/src/main/java/com/loafle/overflow/module/target/service/TargetService.java
@@ -1,27 +1,34 @@
 package com.loafle.overflow.module.target.service;
 
-
-import com.loafle.overflow.module.commons.OFService;
+import com.loafle.overflow.module.probe.model.Probe;
 import com.loafle.overflow.module.target.dao.TargetDAO;
 import com.loafle.overflow.module.target.model.Target;
 import org.springframework.beans.factory.annotation.Autowired;
 
+import java.util.List;
+
 /**
  * Created by insanity on 17. 6. 28.
  */
-public class TargetService extends OFService {
+public class TargetService {
 
     @Autowired
     private TargetDAO targetDAO;
 
-    public String regist(Target target) {
-        Target t = this.targetDAO.save(target);
-        return toString(t);
+    public Target regist(Target target) {
+        return this.targetDAO.save(target);
     }
 
-    public String read(String id) {
-        Target t = this.targetDAO.findOne(Long.valueOf(id));
-        return toString(t);
+    public Target read(String id) {
+        return this.targetDAO.findOne(Long.valueOf(id));
+    }
+
+    public List<Target> readAllByProbe(Probe probe) {
+        return this.targetDAO.findAllByProbe(probe);
+    }
+
+    public void remove(Target target) {
+        this.targetDAO.delete(target);
     }
 
 }