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李基奭 中央醫學社 1942 中央醫學 Vol.11 No.2
In order to examine the fluctuation of flicker values, the author selected. 11 adults. Averge age of the subjects was 21 years, and five of the, subjects had, myopia. The subjects. were tested under the following three different experimental conditions; physical exercise by the ergometer bicycle for three minutes of 2.958 H. P. /min. dark adaptation and reading under bright illumination. The results of the above mentioned experiments were summerized as follows. 1. Flicker values decreased-3.5%N4.5% after exercise compared with the values obtained before exercise. 2. Flicker values did not change markedly before and after, reading under' the-bright, illumination, but in two cases, their values increased after reading. 3. Flicker values showed marked decrease after dark adaptation compared with those before the experiments. 4. Flicker values of the myopic group were. lower than those of the normal visual. group in all the experimental conditions mentioned above.
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Maps in minimal injective resolutions of modules
이기석 대한수학회 2009 대한수학회보 Vol.46 No.3
We investigate the behavior of maps in minimal injective resolution of an A-module M when μ_(t)(m,M)=1 for some t, and we develop slightly the fact that a module of type 1 is Cohen-Macaulay.
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Presenting Matrices of Maximal Cohen-Macaulay Modules
이기석 대한수학회 2007 대한수학회보 Vol.44 No.4
We dene a numerical invariant row CM (A) over Cohen-Mac-aulay local ring A, which is related to rows of the presenting matrices ofmaximal Cohen-Macaulay modules without free summands. We showthat row(A) = row CM (A) for a Cohen-Macaulay (not necessarily Goren-stein) local ring A.
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Various Row Invariants on Cohen-Macaulay Rings
이기석 조선대학교 기초과학연구원 2014 조선자연과학논문집 Vol.7 No.4
We define a numerical invariant rowi* (A) over Cohen-Macaulay local ring A , which is related to the presenting matrices of the j-th syzygy module (with or without free summands). We show that rowd (A)=row cm and rowd* (A) = row*cm(A) for aCohen-Macaulay local ring A of dimension d.
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Restrictions on the Entries of the Maps in Free Resolutions and SC_r-condition
이기석 조선대학교 기초과학연구원 2011 조선자연과학논문집 Vol.4 No.4
We discuss an application of ‘restrictions on the entries of the maps in the minimal free resolution‘ and ‘SC_r-condition of modules’, and give an alternative proof of the following result of Foxby: Let M be a finitely generated module of dimension over a Noetherian local ring (A,m). Suppose that A has no embedded primes. If A is not Gorenstein, then μi(m,A) ≥ 2 for all i ≥ dimA.
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