• 한국수산과학회지
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• 제21권1호
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• pp.11-15
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• 1988

건제품으로 가공, 저장되고 있는 다시마는 조직이 연약하여 건조중 상당한 수축현상을 일으키는데 이의 기초적인 자료를 얻기 위하여 일정한 온도 $(50\%,\;10/^{\circ}C)$, 상대습도 $(30\%)$ 및 풍속 (0.4m/s)으로 열풍 건조를 행하여 가로와 세로의 길이변화, 표면적 수축변화 및 수축속도의 변화등에 관하여 조사한 결과를 요약하면 다음과 같다. 1) 가로수축이 세로수축보다 건조시간 90분까지 약2배 더 많이 수축하였다. 2) 다시마의 표면적 수축은 건조시간 90분까지는 직선적으로 나타났으며, 전건조과정에서 보인 2단계의 수축곡선은 건조속도곡선의 2단계와 잘 일치하였다. 3) 수축속도는 감률건조1단계에서 급속히 증가하여 감률건조2단계의 초기에 최대의 수축에 달하였다.

• 한국연소학회:학술대회논문집
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• 한국연소학회 2014년도 제49회 KOSCO SYMPOSIUM 초록집
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• pp.165-166
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• 2014

The application of particle reaction model in the packed bed process modeling is discussed for iron ore pellet induration process. Combustion of coke breeze in the pellet is estimated by using shrinking unreacted-core model and grain model in which the progress of chemical reaction is described in different concepts. Under the identical inlet gas and solid conditions, the calculation using shrinking core model showed deviated results in terms of temperature profile and conversion fraction, which may imply the significance of selecting proper particle reaction model in consideration of particle characteristics and process operation conditions.

• 한국전자통신학회논문지
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• 제5권4호
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• pp.412-417
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• 2010

본 논문에서는 수축생성기(Shrinking Generator)의해 생성되는 비선형수열의 성질을 분석한다. 또한 수축생성기에 의해 생성되는 비선형 수열을 삽입수열로 해석하여 제어레지스터에서 생성되는 수열의 성질을 이용하여 출력된 수축수열의 위상이동차를 분석하여 가로챈 일부 수열로부터 원래 수열을 복원해내는 방법을 제안한다.

• 한국정보통신학회논문지
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• 제14권11호
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• pp.2507-2513
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• 2010

원시다항식을 특성다항식으로 갖는 두 개의 LFSR로 구성된 수축 생성기를 삽입 생성기로 해석하고, 생성된 수열들 간의 위상이동차(phase shift)에 대하여 분석한다. 또한 위상이동차를 이용하여 수축 생성기에 의하여 생성된 수열의 부분수열을 알 때 나머지 수열을 구하는 방법을 제안한다.

• 대한수학회지
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• 제57권6호
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• pp.1471-1484
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• 2020

It may very well be difficult to prove an eigenvalue inequality of Payne-Pólya-Weinberger type for the bi-drifting Laplacian on the bounded domain of the general complete metric measure spaces. Even though we suppose that the differential operator is bi-harmonic on the standard Euclidean sphere, this problem still remains open. However, under certain condition, a general inequality for the eigenvalues of bi-drifting Laplacian is established in this paper, which enables us to prove an eigenvalue inequality of Ashbaugh-Cheng-Ichikawa-Mametsuka type (which is also called an eigenvalue inequality of Payne-Pólya-Weinberger type) for the eigenvalues with lower order of bi-drifting Laplacian on the Gaussian shrinking soliton.

• 한국세라믹학회지
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• 제37권6호
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• pp.576-582
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• 2000

Two type of expanding cement generally referred to as CSA with Hauyne(3CaO 3Al2O3 CaSO4) and Quick lime(CaO). Hauyne is formed to ettringite when there are presented with CaO and CaSO4, and CaO reacts wtih water to form Ca(OH)2. REcently, the mechanism of compensation and expand mortar or concrete tend to same and it has been used improving on its shrink property. The volume of cement paste varies with its water content shrink with drying and re-wetting. Concrete and mortar works are required shrinking compensation and expansion properties to reduce of potential crack. The use of expansion cement may improve on its shrinking volume changes. CSA dosages for shrinking compensation limited by cement weight, but obtained difference expansion rate with varied W/C or inorganic admixture. This paper studies expansion rate according to expansion cement dosages, water and inorganic admixtures as Silica fume. Therefor, the expansion factor has to considered before the application.

• Nuclear Engineering and Technology
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• 제50권1호
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• pp.145-150
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• 2018

A new methodology, the crack-spallation model, has been developed to analyze gas-solid reactions dominated by crack growth inside of the solid reactant and spallation phenomena. The new model physically represents three processes of the reaction progress: (1) diffusion of gas reactant through pores; (2) growth of product particle in pores; and (3) crack and spallation of solid reactant. The validation of this method has been conducted by comparison of results obtained in an experiment for oxidation of $UO_2$ and the shrinking core model. The reaction progress evaluated by the crack-spallation model shows better agreement with the experimental data than that evaluated by the shrinking core model. To understand the trigger point during the reaction progress, a detailed analysis has been conducted. A parametric study also has been performed to determine mass diffusivities of the gas reactant and volume increase constants of the product particles. This method can be appropriately applied to the gas-solid reaction based on the crack and spallation phenomena such as the voloxidation process.

• 대한수학회논문집
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• 제39권2호
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• pp.421-436
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• 2024

In this article, we propose a shrinking projection algorithm for solving a finite family of generalized equilibrium problem which is also a fixed point of a nonexpansive mapping in the setting of Hadamard manifolds. Under some mild conditions, we prove that the sequence generated by the proposed algorithm converges to a common solution of a finite family of generalized equilibrium problem and fixed point problem of a nonexpansive mapping. Lastly, we present some numerical examples to illustrate the performance of our iterative method. Our results extends and improve many related results on generalized equilibrium problem from linear spaces to Hadamard manifolds. The result discuss in this article extends and complements many related results in the literature.

• 한국섬유공학회:학술대회논문집
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• 한국섬유공학회 2003년도 The Korea-Japan Joint Symposium
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• pp.17-18
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• 2003

Swelling behaviors of Lyocell and Polynosic fibers are investigated by measuring fiber sizes in ferric sodium tartrate complex (FeTNa) and NaOH solution. They showed an anisotropic swelling behavior, i.e., a large expansion in a radius and small shrinking in a longitudinal direction. Birefringent structure was maintained in Lyocell fibers in the swollen state but not in Polynosic fibers for both solvent systems.

• Journal of applied mathematics & informatics
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• 제35권5_6호
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• pp.505-512
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• 2017

In this paper, we explain how the exact closed-form solutions of the classical problems of viscous fluid flow over a heated stretching plate and shrinking sheet can be obtained by a reliable method.