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Insertion-of-Ideal-Factors-Property
백상하,한정민,김정수,이동건,이성엽,서대재,이양,류성주,김주희 영남수학회 2014 East Asian mathematical journal Vol.30 No.5
Due to Bell, a ring R is usually said to be IFP if ab = 0 implies aRb = 0 for a; b 2 R. It is shown that if f(x)g(x) = 0 for f(x) = a0+a1x and g(x) = b0+ +bnxn in R[x], then (f(x)R[x])2n+2g(x) = 0. Motivated by this results, we study the structure of the IFP when proper ideals are taken in place of R, introducing the concept of insertion-of- ideal-factors-property (simply, IIFP) as a generalization of the IFP. A ring R will be called an IIFP ring if ab = 0 (for a; b 2 R) implies aIb = 0 for some proper nonzero ideal I of R, where R is assumed to be non- simple. We in this note study the basic structure of IIFP rings.
Facile synthesis of CNT branch grown steam activated-rGO for lithium sulfur battery cathode
백상하,박재민,( Girish Gund ),박호석 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.1
Lithium-Sulfur battery has derived enormous interests from researchers with its high theoretical energy density (2600 Wh kg<sup>-1</sup>), nontoxicity, abundance of sulfur compared to traditional lithium ion battery. However, it has some problems that poor electric conductivities of sulfur and its compound, volume expansion during discharge stage, and irreversible capacity loss by dissolution of polysulfides called shuttle effect. In this research, we used microwave based CNT grown steam activated rGO for the conductivity issues and volume expansion problem, and metallocene, which is growth point of CNT, can act as confining agent for the polysulfide shuttling problem. 900 mAh g<sup>-1</sup> of initial capacity and 80 % capacity retention until 200<sup>th</sup> cycle were achieved at 0.1C.