6.      J. -H. Choy, S. -J. Hwang, I. Y. Kim, “녹조 제거용 부유성 필름, 및 폐수 정화용 부유성 필름 (Floating Film for Removing Green Tide, and Floating Film for Purification of Wastwater)”, Registration No. 1018184810000 (2018/01/09), Application No. 10-2015-0148267 (2015/10/23).

5.         S. -J. Hwang, I. Y. Kim, “금속 칼코겐 화합물 도메인-함유 복합체를 포함하는 광촉매, 상기 금속 칼코겐 화합물 도메인-함유 복합체 및 이의 제조 방법, 및 상기 금속 칼코겐 화합물 도메인-함유 복합체를 포함하는 전극 재료 (Photocatalyst including metal chalcogenide compound domain-containing composite, metal chalcogenide compound domain-containing composite and preparing method of the same, and electrode material including the same)”, Registration No. 10-2023405 (2019/09/16), Application No. 10-2015-0113413 (2015/08/11).

4.        S. -J. Hwang, I. Y. Kim, “하이브리드종이 및 이의 제조 방법 (Hybrid paper, and preparing method of the same)”, Registration No. 10-1426269 (2014/7/29) Application No. 10-2012-0116420 (2012/10/19).

3.        S. -J. Hwang, I. Y. Kim, J. M. Lee, “다공성 그래핀-층상 티타늄 산화물 나노혼성체 및 그 제조방법 (Porous graphene-layered titanium oxide nanohybrids and production method thereof)”, Registration No. 10-1246811 (2013/03/08), Application No. 1020110000662 (2011/01/04).

2.       S. -J. Hwang, D. -Y. Sung, I. Y. Kim, “망간산화물 나노구조체 제조방법 (Single-step production method for nano-structured manganese oxide)”, Registration No. 1012628570000 (2013/05/03), Application No. 10-2011-0000659 (2011/01/04).

1.         S. -J. Hwang, I. Y. Kim, “이산화망간 나노구조체 제조방법 (Preparation method of nanostructured manganese dioxide)”, Registration No. 10-1049749 (2011/07/11), Application No. 10-2008-0096906 (2008/10/02).