http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
- 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
- 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
RISS 인기검색어
- 검색키워드
- 저자 : Jong Sik Ahn(안종식) (검색결과 14 건)
- 무료
- 기관 내 무료
- 유료
-
안종식(Ahn, Jong Sik),유태안(Yoo, Tae An),김준(Kim, Jun),배지우(Bae, Ji Woo),김건(Kim, Gun) 한국콘크리트학회 2021 한국콘크리트학회 학술대회 논문집 Vol.33 No.2
본 연구에서는 고강도, 고유동성을 동시에 확보하고자, 두 특성에 영향을 끼치는 물결합재비, 무수석고, 잔골재 종류, 고성능 감수제의 양 등을 변수로 압축강도, 슬럼프 실험을 시행하여, 최적의 콘크리트 배합을 구축하는 데 목적을 두었다. The objective of this study is to develop new concrete mix design that satisfies the requirements for both high-strength and high-flowability. To achieve this goal, this study investigates a variety of components including water-to-binder ratio, fine aggregate, gypsum, and superplasticizer which all affect both characteristics. The results of the experiment show that the mix design developed achieves the 28 days strength of 150 MPa while achieving the flowability of 650 mm. We believe that findings from this preliminary study can be used as a reference for on-site concrete casting, particularly construction of high-rising buildings.
-
-
-
안종식 서울産業大學校 1985 논문집 Vol.21 No.1
If any domain R exists such that f(z) or a branch of f(z) is analytic in R, then we speak of it as "an analytic function." Points at which a single-valued function f(z) is not analytic are called singular point or singularities of the function. Also, a point at which a branch of a multivalued function f(z) is not analytic is called a singular point of f(z). This paper is on the possibility to remove the function f(z) that has a singular point in process of integration in complex domain. When positive number R is adopted properly, f(z) is homotopic in annular domain {0< │Z-A│<R}, but when f(z) is not homotopic at "a", "a" becomes the isolated singular of f(z) centering around this function. The removable conditions in singular point of f(z)are examined, and subsquently various characteristics of whole integration of complex variable are studied.
-
安鍾植 서울産業大學校 1991 논문집 Vol.33 No.1
We continue the study of strongly unique best approximation in the paper (1). More precisely, we show that a best approximation by elements of a sun in a uniformly convex Banach space is strongly unique locally. The global analogies of this result are proposed two different methods of proving global strong uniqueness of best approximations. In particular, we apply them to derive strong uniqueness theorems for the Lebesgue spaces and Sobolev spaces. We show that these methods are also applied to prove strong uniqueness of best approximation in some other Banach spaces.
-
Best L₁-Approximation의 特性에 關하여
安鍾植 서울産業大學校 1988 논문집 Vol.27 No.1
근사론은 어느 구간에서의 다항식에 의한 연속함수의 근사에 관계된다. Best Approximation 이란 구간 [a,b] 에서 연속인 일차독립의 함수족{? (?)}의 일차결합?????와 연속함수 f(x) 를 근사시킬때 ????????를 최소로 하는 것이다. 본 논문에서는 유크릿트공간 R?에서 Largrange 정리에 의하여 구간 [a,b] 를 (n+1)개의 서로 다른 점에서 f(x) 에 근사되는 n차 이하의 다항식이 적어도 하나 존재하게 되는데 이를 확장하여 norm공간에 한 정의역에서 주어진 연속함수의 Best uniform Approximation 이 되는 n차 다항식을 발견하여야만 하겠다. 이는 Chevyshev 문제와 폐유계구간 위의 모든 연속 함수가 다항식에 의항 임의의 최소오차를 가진 일양근사를Chevyshev 접근으로 적용하였다. 한편, 측도공간 (K,?)위의 복소함수 f(x), g(x) 에 의하여 w(x)를 밀도로해서 (f.g)= ??f(x)?w(x) dm(x) 일 경우 w(x)를 하중 (weight) 이라 하며, K 를 R?의 부분집합,K위의 연속실수함수족 의 집합 C(K) , W?={ w∈C(K):w>on K }그리고 W={ w:w은 가측, 0< inf{w(x);x∈K } ≤sup{w(x):x=∈K}< ∞}를 생각한다. 임의의 w∈W에 대하여 norm ????????? 로 주어진 공간C(K)를 C?(K)로 쓰자. 이때 모든 f∈C(K) 가 각 norm에 대한 다항식 P 에서 유일한 Best Approximation을 갖는 다면 C(K)에서의 유한차원인 부분공간 P 는 C?(K)의 Chevyshev 부분 공간이 된다. 이성질을 이용하여 본론과 같은 주 정리를 얻 는다.
-
安鍾植 서울産業大學校 1983 논문집 Vol.19 No.1
Function f(χ) which is described in trigonometrical series with the period of 2π is called Fourier series. Although my discussion will be brief, I shall present the main convergence theorems relating to Fourier series. These theorems are of considerable importance in analysis and its application to physics. The set of all functions f:R->R which have period 2π and are piecewise continuous will be denoted by PC(2π). On the space pc(2π) we shall be interested in the two norms ?? = ?? = ?? which are well defined because a function in PC(2π) is bounded and Riemann integrable. It is and elementary exercise to show that if f ∈ PC(2π), then ?? It follows from this inequality that convergence in the norm ?? (that is, uniform convergence) implies convergence in the norm ?? (that is , mean square convergence).
-
安鍾植 서울産業大學校 1986 논문집 Vol.24 No.1
Lebesque 積分論에서는 그 應用面에서나 마찬가지로 理論面에서 函數空間인 ??(μ) 空間의 重要한 성질과 特徵들에 관하여 많이 알려져 왔다. 특히 0<p<q<∞이고 空集合이 아닌 全空間의 測度가 有限일 때는 ??인 사실이 알려져 있다〔2〕. 최근에 Subramanian 과 Romero 는 각각〔2〕와〔6〕에서 0<p<q이면 ??이든가 또는 ??가 되는 測度空間(X, A, μ)의 特徵을 유도하였다. 本 論文에서는 μ(X)<∞이고, 0<p<∞이고 場의 測度를 가지고 서로 만나지 않는 X의 部分集合들의 임의의 集合族의 濃度가 有限일 때, ??(μ)와 ??(μ) 사이의 관계와 ?? (μ)(0<p<1, 1≤p<∞, p=∞)의 여러 가지 성질을 論하였다.
-
安鍾植 서울産業大學校 1994 논문집 Vol.39 No.1
For an arbitrary function f analytic in the disk D : Z<1 and continuous in , we show that geometric convergence in D of best Lp (1≤P≤∞) polynomial approximations to f on C : Z= 1 is assured only when p=2 and a theorem for best polynomial approximation of a function in Lp [-1, 1], 0<p<1, has recently been established. We obtain as a corollary the equivalence for 0<α<k between Em(f)p=O(n-α) and ε k φ=O(tα). The present result complement the theorem for the best polynomial approximation in Lp[-1, 1], 1≤P≤∞. Analogous result for approximating periodic function by trigonometric polymonials in Lp[-π,π ], 0<P≤∞, are known.
-
常微分方程式 dy/dx=f(x,y)의 解의 存在性과 唯一性에 關한 考察
安鍾植 서울産業大學校 1984 논문집 Vol.20 No.1
The purpose of the present paper is to explain an existence and uniqueness theorem. This means that it is a theorem which tells us that under certain conditions(stated in the hypothesis) something exists(the solution described in the conclusion) and is unique(there is only one such solution). It gives no hint whatsoever concerning how to find his solution but merely tells us that the problem has a solution. The hypothesis tells us what conditions are required of the quantities involved. It deals with two objects: the differential equation. ?=f(x,y) and the point(xo, yo). As far as the differential equation ?=f(x,y) is concerned, the hypothesis requires that both the function f and the function ? (obtained by differentiating f(x,y) partially with respect to y) must be continuous in some domain D of the xy plane, As far as the point (xo, yo) is concerned it must be a point in this same domain D, where f and ? are so well behaved(that is, continuous.) The Cauchy-Picard's theorem is applied to this problem. We shall prove this theorem by way of Contraction theorem and other knowledges.
연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
