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RISS 인기검색어
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- 저자 : 이기석,추병선 (검색결과 607 건)
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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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On Regularity and drs-invariant of a Homogeneous Cohen-Macauly Ring
이기석 조선대학교 기초과학연구원 2018 조선자연과학논문집 Vol.11 No.2
We show that the (Castelnuovo-Mumford) regularity of a homogeneous Cohen-Macaulay ring agrees with some of the invariants defined the papers, and we study a ring of small index.
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이기석,이지은,김지혜 호남수학회 2015 호남수학학술지 Vol.37 No.4
The $n$-th cyclotomic polynomial $\Phi_n(x)$ is irreducible over $\mathbb Q$ and has integer coefficients. The degree of $\Phi_n(x)$ is $\varphi(n)$, where $\varphi(n)$ is the Euler Phi-function. In this paper, we define Semi-Cyclotomic Polynomial $J_{n}(x)$. $J_{n}(x)$ is also irreducible over $\mathbb Q$ and has integer coefficients. But the degree of $J_{n}(x)$ is $\frac{\varphi(n)}{2}$. Galois Theory will be used to prove the above properties of $J_{n}(x)$.
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소각 바닥재의 탄산화를 통한 중금속 안정화 및 CO2 고정
이기석,김영민,현재혁,이우진 한국폐기물자원순환학회 2015 한국폐기물자원순환학회지 Vol.32 No.8
According to a report ‘2012 Present Condition of National Household Refuse Resource Recovery Facility’, about 582,178 tons/year of household refuse were processed in the incineration plant, and 465,087 tons/year of bottom ash and 117,091 tons/year of fly ash were produced respectively. As incineration ash contains many kind of heavy metals such as soluble salt, copper and lead, it may lead to the leaching potential of heavy metals according to the environmental change, so it requires special care in landfill and recycling. In this study CO2 was injected into the bottom ash, so that environmental stability such as leaching of heavy metals was reduced and increased the possibility of CO2 fixation ability of the bottom ash was analyzed. Bottom ash of the household refuse incineration plant of I City was used as the sample of the fixation ability particle size was divided into 3 sections to analyze its components before and after carbonation using XRF. Stability of the sample was identified by the leaching test through KSLT and TCLP, and CO2 fixation ability by the DT-TGA analysis. Test results of the fixation ability shows that stabilization of the bottom ash produced in the household refuse incineration plant by carbonation is evaluated as there is little environmental problem caused by heavy metals when it is utilized into the recycled aggregate, and economic profits can be expected due to securing new agents of the supply and demand for the recycled aggregates, the greenhouse gas emission reduction by CO2 fixation.
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Invariants of Local Rings under Completion
이기석 조선대학교 기초과학연구원 2017 조선자연과학논문집 Vol.10 No.4
We study the behavior of some invariants under completion. We also give a counterexample, which is the same as a counterexample to Ding's Conjecture, to Koh-Lee's Conjecture.
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디지털 에셋 창작을 위한 생성형 AI 기술 동향 및 발전 전망
이기석,이승욱,윤민성,유정재,오아름,최인문,김대욱,K.S. Lee,S.W. Lee,M.S. Yoon,J.J. Yu,A.R. Oh,I.M. Choi,D.W. Kim 한국전자통신연구원 2024 전자통신동향분석 Vol.39 No.2
With the recent rapid development of artificial intelligence (AI) technology, its use is gradually expanding to include creative areas and building new content using generative AI solutions, reaching beyond existing data analysis and reasoning applications. Content creation using generative AI faces challenges owing to technical limitations and other aspects such as copyright compliance. Nevertheless, generative AI may increase the productivity of experts and overcome barriers to creative work by allowing users to easily express their ideas as digital content. Thus, various types of applications will continue to emerge. As images and videos can be created using text input on a prompt, generative AI allows to create and edit digital assets quickly. We present trends in generative AI technology for images, videos, three-dimensional (3D) assets and scenes, digital humans, interactive content, and interfaces. In addition, the prospects for future technological development in this field are discussed.
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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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