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Topology optimization of reinforced concrete structure using composite truss-like model

  • Yang, Zhiyi;Zhou, Kemin;Qiao, Shengfang
    • Structural Engineering and Mechanics
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    • 제67권1호
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    • pp.79-85
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    • 2018
  • Topology optimization of steel and concrete composite based on truss-like material model is studied in this paper. First, the initial design domain is filled with concrete, and the steel is distributed in it. The problem of topology optimization is to minimize the volume of steel material and solved by full stress method. Then the optimized steel and concrete composite truss-like continuum is obtained. Finally, the distribution of steel material is determined based on the optimized truss-like continuum. Several numerical results indicate the numerical instability and rough boundary are settled. And more details of manufacture and construction can be presented based on the truss-like material model. Hence, the truss-like material model of steel and concrete is efficient to establish the distribution of steel material in concrete.

Ion Implantation으로 Ca를 첨가한 단결정 Al2O3의 Crack-like Pore의 Healing 거동 - I. Crack-like Pore의 형성과 Morphological Evolution (Effect of Ca Implantation on the Sintering and Crack Healing Behavior of High Purity Al2O3 Using Micro-lithographic Technique - I. Formation of Crack-like Pore and Its Morphological Evolution)

  • 김배연
    • 한국세라믹학회지
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    • 제34권8호
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    • pp.834-842
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    • 1997
  • Controlled Ca impurity implanted inner crack-like pore in the high purity alumina single crystal, sapphire, had been created by micro-fabrication technique, which includes ion implantation, photo-lithography, Ar ion milling, and hot press technique. The morphological change and the healing of cracklike pore in Ca doped high purity single crystal alumina, sapphire, during high temperature heat treatment in vacuum were observed using optical microscopy. The dot-like surface roughening was developed and hexagon like crystal appeared on inner surface of crack-like pore after heat treatment. Bar type crystals, probably CaO.6Al2O3, were observed on the inner surface after 1 hour heat treatment at 1, 50$0^{\circ}C$, but this bar type crystal disappeared after 1 hour heat treatment at 1, $600^{\circ}C$. This disappearance means that there should be a little increase of Ca solubility limit to alumina at this temperatures.

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Characterization of Ty3-gypsy-like Elements in Hibiscus syriacus

  • Jeung, Ji-Ung;Cho, Sung Ki;Lee, Seung Jae;Shin, Jeong Sheop
    • Molecules and Cells
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    • 제19권3호
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    • pp.318-327
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    • 2005
  • Southern blot analysis revealed a ubiquitous distribution and high copy number of Ty3-gypsy-like elements in the genome of Hibiscus syriacus. Comparative phylogenetic analysis of the large subunit of Rubisco and the integrase region of Ty3-gypsy elements in various plant species indicated that the retrotransposon-like sequences have different evolutionary histories and their own unique polymorphism in the H. syriacus population. Sequence-tagged site-restriction fragment length polymorphisms (STS-RFLP) analysis also indicated great variability in the numbers and sequences of Ty3-gypsy-like elements within H. syriacus varieties. Ty3-gypsy-like elements may still be active within H. syriacus, since Northern analysis of wounded leaves of H. syriacus variety Saehan with a probe for the integrase domain gave strong hybridization signals. The sequence heterogeneity and ubiquity of the Ty3-gypsy-like elements in H. syriacus genomes could provide reliable DNA markers for line identification as well for the analysis of genetic diversity in H. syriacus.

LWE-like KEM/전자서명에 대한 부채널 대응기법 동향

  • 이정환;정상윤;신원근;박수진;김희석
    • 정보보호학회지
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    • 제33권3호
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    • pp.85-96
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    • 2023
  • LWE-like 암호는 지난 몇 년간 표준화 선정 대상 유력 후보로 주목받았다. 실제로 NIST가 선정한 양자내성암호 표준화 진행 대상 4종 중 2종이 LWE 기반 암호인만큼, LWE-like 암호는 많은 중요성을 가지고 있으며 이에 따라 LWE-like 암호에 대한 부채널 분석/대응 기술 연구가 활발히 진행되었다. 특히 전력/전자파를 이용한 분석과 이에 대한 마스킹 대응기법 연구가 많은 결실을 맺었다. 따라서 본 논문은 LWE-like KEM/전자서명에 대한 부채널 대응기술 중 마스킹 기법 동향을 서술한다. LWE-like KEM에 대한 1차 및 고차 마스킹 기법 연구 동향을 정리하고, LWE-like 전자서명에 대한 고차 마스킹 기법 동향을 정리한다.

ENLARGING THE BALL OF CONVERGENCE OF SECANT-LIKE METHODS FOR NON-DIFFERENTIABLE OPERATORS

  • Argyros, Ioannis K.;Ren, Hongmin
    • 대한수학회지
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    • 제55권1호
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    • pp.17-28
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    • 2018
  • In this paper, we enlarge the ball of convergence of a uniparametric family of secant-like methods for solving non-differentiable operators equations in Banach spaces via using ${\omega}$-condition and centered-like ${\omega}$-condition meantime as well as some fine techniques such as the affine invariant form. Numerical examples are also provided.

ON THE GENERALIZED SOR-LIKE METHODS FOR SADDLE POINT PROBLEMS

  • Feng, Xin-Long;Shao, Long
    • Journal of applied mathematics & informatics
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    • 제28권3_4호
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    • pp.663-677
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    • 2010
  • In this paper, the generalized SOR-like methods are presented for solving the saddle point problems. Based on the SOR-like methods, we introduce the uncertain parameters and the preconditioned matrixes in the splitting form of the coefficient matrix. The necessary and sufficient conditions for guaranteeing its convergence are derived by giving the restrictions imposed on the parameters. Finally, numerical experiments show that this methods are more effective by choosing the proper values of parameters.

EXISTENCE AND ITERATIVE APPROXIMATIONS OF SOLUTIONS FOR STRONGLY NONLINEAR VARIATIONAL-LIKE INEQUALITIES

  • Li, Jin-Song;Sun, Ju-He;Kang, Shin-Min
    • East Asian mathematical journal
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    • 제27권5호
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    • pp.585-595
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    • 2011
  • In this paper, we introduce and study a new class of strongly nonlinear variational-like inequalities. Under suitable conditions, we prove the existence of solutions for the class of strongly nonlinear variational- like inequalities. By making use of the auxiliary principle technique, we suggest an iterative algorithm for the strongly nonlinear variational-like inequality and give the convergence criteria of the sequences generated by the iterative algorithm.

PETTIS INTEGRABILITY OF SEPARABLE-LIKE FUNCTIONS

  • Lee, Byoung-Mu
    • 한국수학교육학회지시리즈B:순수및응용수학
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    • 제6권2호
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    • pp.53-58
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    • 1999
  • In this paper, we introduce the notion of separable-like function, investigate some properties of separable-like functions, and characterize the Pettis integrability of function on a finite perfect measure space.

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MULTIVALUED MIXED QUASI-VARIATIONAL-LIKE INEQUALITIES

  • Lee Byung-Soo
    • 한국수학교육학회지시리즈B:순수및응용수학
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    • 제13권3호
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    • pp.197-206
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    • 2006
  • This paper introduces a class of multivalued mixed quasi-variational-like ineqcalities and shows the existence of solutions to the class of quasi-variational-like inequalities in reflexive Banach spaces.

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