diff --git a/src/main/java/com/smart/watchboard/WatchboardApplication.java b/src/main/java/com/smart/watchboard/WatchboardApplication.java
index 8eae708..9f027da 100644
--- a/src/main/java/com/smart/watchboard/WatchboardApplication.java
+++ b/src/main/java/com/smart/watchboard/WatchboardApplication.java
@@ -2,7 +2,10 @@
 
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.scheduling.annotation.EnableScheduling;
+
 @SpringBootApplication
+@EnableScheduling
 public class WatchboardApplication {
 
 	public static void main(String[] args) {
diff --git a/src/main/java/com/smart/watchboard/common/support/ScheduledTask.java b/src/main/java/com/smart/watchboard/common/support/ScheduledTask.java
new file mode 100644
index 0000000..2dd5c78
--- /dev/null
+++ b/src/main/java/com/smart/watchboard/common/support/ScheduledTask.java
@@ -0,0 +1,17 @@
+package com.smart.watchboard.common.support;
+
+import com.smart.watchboard.service.SseService;
+import lombok.RequiredArgsConstructor;
+import org.springframework.scheduling.annotation.Scheduled;
+import org.springframework.stereotype.Component;
+
+@Component
+@RequiredArgsConstructor
+public class ScheduledTask {
+    private final SseService sseService;
+
+    @Scheduled(fixedRate = 30000)
+    public void executeNotifyTask() {
+        sseService.notifyCycle();
+    }
+}
diff --git a/src/main/java/com/smart/watchboard/controller/AudioFileController.java b/src/main/java/com/smart/watchboard/controller/AudioFileController.java
index 24efb22..d5fadb9 100644
--- a/src/main/java/com/smart/watchboard/controller/AudioFileController.java
+++ b/src/main/java/com/smart/watchboard/controller/AudioFileController.java
@@ -47,7 +47,8 @@ public class AudioFileController {
 
     @PostMapping("/{documentID}/audio")
     public ResponseEntity<?> uploadAudioFile(@PathVariable(value = "documentID") long documentId, @RequestParam("audio") MultipartFile audioFile, @RequestHeader("Authorization") String accessToken) throws UnsupportedAudioFileException, IOException, DocumentException {
-        Optional<Long> id = jwtService.extractUserId(accessToken);
+        String extractedAccessToken = jwtService.extractAccessToken(accessToken);
+        Optional<Long> id = jwtService.extractUserId(extractedAccessToken);
         Long userId = id.orElse(null);
 
         // s3에 오디오 파일 저장
diff --git a/src/main/java/com/smart/watchboard/controller/LearningFileController.java b/src/main/java/com/smart/watchboard/controller/LearningFileController.java
index 65b5de8..2052393 100644
--- a/src/main/java/com/smart/watchboard/controller/LearningFileController.java
+++ b/src/main/java/com/smart/watchboard/controller/LearningFileController.java
@@ -38,7 +38,8 @@ public class LearningFileController {
 
     @PostMapping("/{documentID}/pdf")
     public ResponseEntity<?> uploadLearningFile(@PathVariable(value = "documentID") long documentId, @RequestParam("pdf") MultipartFile pdfFile, @RequestHeader("Authorization") String accessToken) throws UnsupportedAudioFileException, IOException {
-        Optional<Long> id = jwtService.extractUserId(accessToken);
+        String extractedAccessToken = jwtService.extractAccessToken(accessToken);
+        Optional<Long> id = jwtService.extractUserId(extractedAccessToken);
         Long userId = id.orElse(null);
 
         if (!checkPageLimit(countPdfPage(pdfFile))) {
@@ -47,16 +48,9 @@ public ResponseEntity<?> uploadLearningFile(@PathVariable(value = "documentID")
 
         S3Dto s3Dto = new S3Dto(pdfFile, documentId, userId, "pdf");
         String path = awsS3Uploader.uploadFile(s3Dto);
-        //sseService.notifyKeywords(documentId, path);
-        //sseService.notifySummary(documentId, path);
-//        ResponseEntity<KeywordsBodyDto> responseEntity = requestService.requestPdfKeywords(path);
-//        keywordService.createKeywords(responseEntity, documentId);
-//
-//        ResponseEntity<SummaryDto> summary = requestService.requestPdfSummary(path);
-//        summaryService.createSummary(documentId, summary.getBody().getSummary());
+
         whiteboardService.setDataType(documentId, "pdf");
 
-        //return new ResponseEntity<>(responseEntity.getBody(), HttpStatus.OK);
         return new ResponseEntity<>(HttpStatus.OK);
     }
 
diff --git a/src/main/java/com/smart/watchboard/repository/EmitterRepository.java b/src/main/java/com/smart/watchboard/repository/EmitterRepository.java
index c98bffd..1b2c26f 100644
--- a/src/main/java/com/smart/watchboard/repository/EmitterRepository.java
+++ b/src/main/java/com/smart/watchboard/repository/EmitterRepository.java
@@ -4,8 +4,10 @@
 import org.springframework.stereotype.Repository;
 import org.springframework.web.servlet.mvc.method.annotation.SseEmitter;
 
+import java.util.List;
 import java.util.Map;
 import java.util.concurrent.ConcurrentHashMap;
+import java.util.stream.Collectors;
 
 @Repository
 @RequiredArgsConstructor
@@ -23,4 +25,9 @@ public void deleteById(Long id) {
     public SseEmitter get(Long id) {
         return emitters.get(id);
     }
+
+    public List<Long> getAllKeys() {
+        return emitters.keySet().stream()
+                .collect(Collectors.toList());
+    }
 }
diff --git a/src/main/java/com/smart/watchboard/service/SseService.java b/src/main/java/com/smart/watchboard/service/SseService.java
index 94cd721..adf383c 100644
--- a/src/main/java/com/smart/watchboard/service/SseService.java
+++ b/src/main/java/com/smart/watchboard/service/SseService.java
@@ -51,6 +51,24 @@ public void notify(Long documentId, List<String> keywords) {
         sendToClient(documentId, keywords);
     }
 
+    public void notifyCycle() {
+        sendCycle();
+    }
+
+    private void sendCycle() {
+        List<Long> keys = emitterRepository.getAllKeys();
+        for (Long documentId : keys) {
+            SseEmitter emitter = emitterRepository.get(documentId);
+            try {
+                emitter.send(SseEmitter.event().id(String.valueOf(documentId)).name("ping").data("ping"));
+            } catch (IOException exception) {
+                emitterRepository.deleteById(documentId);
+                emitter.completeWithError(exception);
+            }
+
+        }
+    }
+
     private void sendToClientFirst(Long documentId, Object data) {
         SseEmitter emitter = emitterRepository.get(documentId);
         if (emitter != null) {