diff --git a/usx/index.html b/usx/index.html
index 5cd52b4..feb80b9 100644
--- a/usx/index.html
+++ b/usx/index.html
@@ -53,10 +53,10 @@
 <ul id='publist'>
 <li><a href='Nami Kim_graduation thesis_Xpub.pdf' target="_blank" class='ext'>Publication PDF</a></li>
 </ul>
-<img src="img/pub1.jpg" class='workimg'/>
-<img src="img/pub2.jpg" class='workimg'/>
-<img src="img/pub3.jpg" class='workimg'/>
-<img src="img/pub4.jpg" class='workimg'/>
+<img src="nami_pub1.png" class='workimg'/>
+<img src="nami_pub2.png" class='workimg'/>
+<img src="nami_pub3.png" class='workimg'/>
+<img src="nami_pub4.png" class='workimg'/>
 </div>
 <div id='gradshow'>
 <h3 class='gal-title'>Graduation Show</h3>