• Title/Summary/Keyword: Preserving conditions

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A SIMPLE CHARACTERIZATION OF POSITIVITY PRESERVING SEMI-LINEAR PARABOLIC SYSTEMS

  • Haraux, Alain
    • Journal of the Korean Mathematical Society
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    • v.54 no.6
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    • pp.1817-1828
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    • 2017
  • We give a simple and direct proof of the characterization of positivity preserving semi-flows for ordinary differential systems. The same method provides an abstract result on a class of evolution systems containing reaction-diffusion systems in a bounded domain of ${\mathbb{R}}^n$ with either Neumann or Dirichlet homogeneous boundary conditions. The conditions are exactly the same with or without diffusion. A similar approach gives the optimal result for invariant rectangles in the case of Neumann conditions.

Study on Application of the Preserving Valuation Index for Environmental Management of a Stack Room (서고환경관리를 위한 보존성 평가지수 활용에 관한 연구)

  • Yoon, Dai-Hyun;Shin, Hyun-Chang
    • The Korean Journal of Archival Studies
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    • no.31
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    • pp.139-161
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    • 2012
  • Donald K. Sebera model can quantitatively compare the preserving environment by calculating the preserving valuation index with changing only the temperature and humidity. In this study, Donald K. Sebera model was used in order to compare and evaluate the preserving valuation index on the best condition and the worst condition in the temperature and humidity range of public records management act. As the results, the preserving valuation index in the best conditions was larger 2.47 times than the worst conditions within the preserving environment permitted in public records management act. Also, the influence of the humidity on the preserving valuation index of a paper archives as decreasing the activation energy for the hydrolysis reaction was larger rather than temperature. Thus the preserving valuation index can easily evaluate the suitability of the temperature and humidity conditions for preserving a archives. Therefore it can be used as useful tool for preservation of archives on change of the temperature and humidity.

SHAPE PRESERVING ADDITIONS OF LR-FUZZY INTERVALS WITH UNBOUNDED SUPPORT

  • Hong, Dug-Hun
    • Journal of applied mathematics & informatics
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    • v.27 no.5_6
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    • pp.1049-1059
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    • 2009
  • Continuous t-norm based shape preserving additions of LR-fuzzy intervals with unbounded support is studied. The case for bounded support, which was a conjecture suggested by Mesiar in 1997, was proved by the author in 2002 and 2008. In this paper, we give a necessary and sufficient conditions for a continuous t-norm T that induces DR-shape preserving addition of LR-fuzzy intervals with unbounded support. Some of the results can be deduced from the results given in the paper of Mesiar in 1997. But, we give direct proofs of the results.

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FULL SPECTRUM PRESERVING LINEAR MAPPING BETWEEN STLICTLY DENSE BANACH ALGEBRAS

  • Lee, Young-Whan;Park, Kyoo-Hong
    • Journal of applied mathematics & informatics
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    • v.6 no.1
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    • pp.303-307
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    • 1999
  • Let A and B be two strictly dense Banach Algebras on X and Y respectively where X and Y are Banach space. We give some conditions under which full spectrum preserving linear mappings from A into B Jordan morphisms and X is homomorphic to Y.

SOME SYMMETRY PRESERVING TRANSFORMATION IN POPULATION GENETICS

  • Choi, Won
    • Journal of applied mathematics & informatics
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    • v.27 no.3_4
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    • pp.757-762
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    • 2009
  • In allelic model $X\;=\;(x_1,\;x_2,\;{\cdots},\;x_d)$, $$M_f(t)\;=\;f(p(t))\;-\;{\int}^t_0\;Lf(p(t))ds$$ is a P-martingale for diffusion operator L under the certain conditions. We can also obtain a new diffusion operator $L^*$ for diffusion coefficient and we prove that unique solution for $L^*$-martingale problem exists. In this note, we define new symmetric preserving transformation. Uniqueness for martingale problem and symmetric property will be proved.

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GENERATING SETS OF STRICTLY ORDER-PRESERVING TRANSFORMATION SEMIGROUPS ON A FINITE SET

  • Ayik, Hayrullah;Bugay, Leyla
    • Bulletin of the Korean Mathematical Society
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    • v.51 no.4
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    • pp.1055-1062
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    • 2014
  • Let $O_n$ and $PO_n$ denote the order-preserving transformation and the partial order-preserving transformation semigroups on the set $X_n=\{1,{\ldots},n\}$, respectively. Then the strictly partial order-preserving transformation semigroup $SPO_n$ on the set $X_n$, under its natural order, is defined by $SPO_n=PO_n{\setminus}O_n$. In this paper we find necessary and sufficient conditions for any subset of SPO(n, r) to be a (minimal) generating set of SPO(n, r) for $2{\leq}r{\leq}n-1$.

A NIELSEN TYPE NUMBER OF FIBRE PRESERVING MAPS

  • Lee, Seoung Ho
    • Communications of the Korean Mathematical Society
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    • v.28 no.2
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    • pp.361-369
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    • 2013
  • We introduce a Nielsen type number of a fibre preserving map, and show that it is a lower bound for the number of $n$-orbits in the homotopy class. Under suitable conditions we show that it is equal to the Nielsen type relative essential $n$-orbit number. We also give necessary and sufficient conditions for it and the essential $n$-orbit number to coincide.

COREGULARITY OF ORDER-PRESERVING SELF-MAPPING SEMIGROUPS OF FENCES

  • JENDANA, KETSARIN;SRITHUS, RATANA
    • Communications of the Korean Mathematical Society
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    • v.30 no.4
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    • pp.349-361
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    • 2015
  • A fence is an ordered set that the order forms a path with alternating orientation. Let F = (F;${\leq}$) be a fence and let OT(F) be the semigroup of all order-preserving self-mappings of F. We prove that OT(F) is coregular if and only if ${\mid}F{\mid}{\leq}2$. We characterize all coregular elements in OT(F) when F is finite. For any subfence S of F, we show that the set COTS(F) of all order-preserving self-mappings in OT(F) having S as their range forms a coregular subsemigroup of OT(F). Under some conditions, we show that a union of COTS(F)'s forms a coregular subsemigroup of OT(F).

Enhanced Hybrid Privacy Preserving Data Mining Technique

  • Kundeti Naga Prasanthi;M V P Chandra Sekhara Rao;Ch Sudha Sree;P Seshu Babu
    • International Journal of Computer Science & Network Security
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    • v.23 no.6
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    • pp.99-106
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    • 2023
  • Now a days, large volumes of data is accumulating in every field due to increase in capacity of storage devices. These large volumes of data can be applied with data mining for finding useful patterns which can be used for business growth, improving services, improving health conditions etc. Data from different sources can be combined before applying data mining. The data thus gathered can be misused for identity theft, fake credit/debit card transactions, etc. To overcome this, data mining techniques which provide privacy are required. There are several privacy preserving data mining techniques available in literature like randomization, perturbation, anonymization etc. This paper proposes an Enhanced Hybrid Privacy Preserving Data Mining(EHPPDM) technique. The proposed technique provides more privacy of data than existing techniques while providing better classification accuracy. The experimental results show that classification accuracies have increased using EHPPDM technique.

CONDITIONS IMPLYING CONTINUITY OF MAPS

  • Baran, Mehmet;Kula, Muammer;Erciyes, Ayhan
    • Journal of the Korean Mathematical Society
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    • v.46 no.4
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    • pp.813-826
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    • 2009
  • In this paper, we generalize the notions of preserving and strongly preserving maps to arbitrary set based topological categories. Further, we obtain characterizations of each of these concepts as well as interprete analogues and generalizations of theorems of Gerlits at al [20] in the categories of filter and local filter convergence spaces.