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Featured researches published by Sungjin Kwon.


International Journal of Modern Physics B | 2003

Evaluation of Corrosion Degradation of 12Cr Alloy Steel Using an Ultrasonic Backward Radiation

Sung Jin Song; Young H. Kim; Dong-Ho Bae; Myeong Hee Jung; Sungjin Kwon

The corrosion degradation characteristics of the 12Cr alloy steel, which is widely used in fossil power plants as a turbine blade material, are evaluated nondestructively by use of the backward radiation of propagating Rayleigh wave. For this purpose, an automated system for measuring the ultrasonic backward radiation has been developed, and the frequency dependency of the Rayleigh surface wave has been investigated indirectly by observing the angular dependency of the acquired signals. The velocity of Rayleigh wave decreased as the increase of aging time, which implies the increase of the effective degraded layer thickness. And the peak amplitude of the radiation increased as aging time, which relates to the increase of inter-granular corrosion. The result observed in this study demonstrates high potential of the backward radiated ultrasound as a tool for nondestructive evaluation of the corrosion degradation characteristics of aged materials.


Archive | 2006

Secondary battery of improved safety

Sungjin Kwon; Soon-Ho Ahn; Hyun Chul Jung; Ki Woong Kim; Young Hun Kim


Archive | 2013

Battery cell of stair-like structure

Young Hun Kim; Sungjin Kwon; Soon-Ho Ahn; Dong-Myung Kim; Ki Woong Kim; Seung-Min Ryu


Archive | 2013

Electrode assembly including steps having corner portions of various shapes, battery cell, battery pack, and device including same

Seung-Min Ryu; Sungjin Kwon; Soon-Ho Ahn; Dong-Myung Kim; Ki Woong Kim; Young-Hoon Kim


Archive | 2013

Stepped electrode assembly having predetermined a thickness ratio in the interface between electrode units, battery cell and device comprising the same

Sungjin Kwon; Soon-Ho Ahn; Dong-Myung Kim; Ki Woong Kim; Young-Hoon Kim; Sung-Han Yoon; Seung-Min Ryu


Archive | 2013

Electrode assembly, and battery cell and device comprising same

Sungjin Kwon; 권성진; Soon-Ho Ahn; 안순호; Dong-Myung Kim; 김동명; Ki Woong Kim; 김기웅; Young-Hun Kim; 김영훈; Sung-Han Yoon; 윤성한; Seung-Min Ryu; 류승민


Archive | 2013

Battery cell of asymmetric structure and battery pack employed with the same

Kyoung Won Kang; Hyun Chul Jung; Ki Woong Kim; Sungjin Kwon


Archive | 2013

Electrode assembly and composite electrode assembly of stair-like structure

Sungjin Kwon; Soon-Ho Ahn; Dong-Myung Kim; Ki Woong Kim; Pillgyu Jang; Young-Hoon Kim; Sung-Han Yoon; Hyun Park


Archive | 2013

ELECTRODE ASSEMBLY HAVING STEPPED PORTION, AS WELL AS BATTERY CELL, BATTERY PACK, AND DEVICE INCLUDING THE ELECTRODE ASSEMBLY

Sungjin Kwon; Soon-Ho Ahn; Dong-Myung Kim; Ki Woong Kim; Young-Hoon Kim; Sung-Han Yoon; Seung-Min Ryu


Archive | 2011

ELECTRODE ASSEMBLY OF NOVEL STRUCTURE AND PROCESS FOR PREPARATION OF THE SAME

Jihoon Cho; Dong-Myung Kim; Ki Woong Kim; Sung-Min Hwang; Hyun Chul Jung; Sungjin Kwon; Hyeong Jin Kim; Ki Hong Min

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김기웅

Korea Research Institute of Standards and Science

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