diff --git a/src/main/java/com/greenorange/promotion/model/dto/userInfo/UserInfoRegisterRequest.java b/src/main/java/com/greenorange/promotion/model/dto/userInfo/UserInfoRegisterRequest.java
index 1f59571..b7b8df5 100644
--- a/src/main/java/com/greenorange/promotion/model/dto/userInfo/UserInfoRegisterRequest.java
+++ b/src/main/java/com/greenorange/promotion/model/dto/userInfo/UserInfoRegisterRequest.java
@@ -2,6 +2,7 @@ package com.greenorange.promotion.model.dto.userInfo;
 
 import io.swagger.v3.oas.annotations.media.Schema;
 import jakarta.validation.constraints.NotBlank;
+import jakarta.validation.constraints.Pattern;
 import jakarta.validation.constraints.Size;
 import lombok.Data;
 
diff --git a/src/main/resources/application.yml b/src/main/resources/application.yml
index 99bfa52..a17ec4c 100644
--- a/src/main/resources/application.yml
+++ b/src/main/resources/application.yml
@@ -1,4 +1,4 @@
 spring:
   profiles:
-    active: practice
+    active: test
 
diff --git a/src/test/java/com/greenorange/promotion/homework/DiningPhilosophers.java b/src/test/java/com/greenorange/promotion/homework/DiningPhilosophers.java
new file mode 100644
index 0000000..0c469e6
--- /dev/null
+++ b/src/test/java/com/greenorange/promotion/homework/DiningPhilosophers.java
@@ -0,0 +1,32 @@
+package com.greenorange.promotion.homework;
+
+import java.util.concurrent.locks.Lock;
+import java.util.concurrent.locks.ReentrantLock;
+
+public class DiningPhilosophers {
+    private final Lock[] forks = new Lock[5];
+
+    public DiningPhilosophers() {
+        for (int i = 0; i < 5; i++) forks[i] = new ReentrantLock();
+    }
+
+    public void philosopher(int id) {
+        try {
+            think(id);
+            if (id % 2 == 0) { forks[(id + 1) % 5].lock(); forks[id].lock(); }
+            else { forks[id].lock(); forks[(id + 1) % 5].lock(); }
+            eat(id);
+        } finally { forks[id].unlock(); forks[(id + 1) % 5].unlock(); }
+    }
+
+    private void think(int id) { System.out.println("哲学家 " + id + " 在思考..."); }
+    private void eat(int id) { System.out.println("哲学家 " + id + " 在吃饭..."); }
+
+    public static void main(String[] args) {
+        DiningPhilosophers dp = new DiningPhilosophers();
+        for (int i = 0; i < 5; i++) {
+            int finalI = i;
+            new Thread(() -> dp.philosopher(finalI)).start();
+        }
+    }
+}