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NECESSARY AND SUFFICIENT CONDITIONS FOR CONVERGENCE OF ISHIKAWA ITERATIVE SCHEMES WITH ERRORS TO φ-HEMICONTRACTIVE MAPPINGS

  • Liu, Seqing;Kim, Jong-Kyu;Kang, Shin-Min
    • Communications of the Korean Mathematical Society
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    • v.18 no.2
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    • pp.251-261
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    • 2003
  • The purpose of this paper is to establish the necessary and sufficient conditions which ensure the strong convergence of the Ishikawa iterative schemes with errors to the unique fixed point of a $\Phi$-hemicontractive mapping defined on a nonempty convex subset of a normed linear space. The results of this paper extend substantially most of the recent results.

2.5 Dimensional Hexahedral Mesh Generation by Mapping Algorithm (매핑 알고리즘을 이용한 2.5차원 입체에 대한 육면체 요소망 자동 생성)

  • Choi C.H.;Chae S.W.;Kwon K.Y.;Lee B.C.
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2006.05a
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    • pp.423-424
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    • 2006
  • This paper proposes a hexahedral mesh generation scheme based on mapping approach and improves the drawback of sweeping algorithm. In order to improve the drawback, the algorithm in this paper generates hexahedral meshes by three dimensional element mapping first. Then hexahedral meshes are equivalent to geometry of the volume by mapping and smoothing. Sample meshes are constructed to demonstrate the mesh generating capability of the proposed algorithm.

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Performance Enhancement of Trellis Coded Mary PSK using Minimum Hamming Distance (최소해밍거리를 이용한 트렐리스 부호화된 M- ray PSK의 성능 향상)

  • 은도현;조훈상;이순흠
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.12 no.3
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    • pp.417-424
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    • 2001
  • This paper proposes new symbol mapping method that can enhance the performance of trellis coded M-ary PSK compared with conventional symbol mapping methods in AWGN environment. Since the basic criteria of TCM design is Maximum Euclidean distance in AWGN, conventional symbol mapping method keep this basic criteria. In this paper, proposed new symbol mapping method uses both Euclidean distance and Hamming distance to design, while conventional methods make use of only optimal Euclidean distance. New symbol mapping method show the better BER performance than the other through computer simulation and error equations.

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PAPR-minimized Sequence Mapping with Data Space Reduction by Partial Data Side Information in OFDM System (OFDM 시스템에서 부분 데이터 추가정보를 이용한 데이터 공간 감소를 갖는 최대 전력 대 평균 전력 비 최소화 시퀀스 사상 기법)

  • Jin Jiyu;Ryu Kwan Woongn;Park Yong wan
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.29 no.12A
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    • pp.1340-1348
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    • 2004
  • In this paper, we propose a PAPR-minimized sequence mapping scheme that achieves the minimum Peak-to-Average Power Ratio (PAPR) and the minimum amount of computations for the OFDM system. To reduce the PAPR, the mapping table is created with information about block index and symbol patterns of the lower signal power. When the input data sequence comes, it performed division by the block length to find the quotient and remainder. The symbol pattern of the lower signal power can be found in terms of the block index as the quotient in the mapping table and transmitted with remainder as the side information to distinguish and recover the original data sequence in the receiver. The two methods with the proposed mapping scheme are proposed in this paper. One is with mapping table to recover the O%M signal in both transmitter and receiver. The other is with mapping table only in transmitter to reduce the load and the complexity in the mobile system. We show that this algorithm provides the PAPR reduction, the simple processing and less computational complexity to be implemented for the multi-carrier system.

STRONG CONVERGENCE THEOREMS FOR FIXED POINT PROBLEMS OF ASYMPTOTICALLY QUASI-𝜙-NONEXPANSIVE MAPPINGS IN THE INTERMEDIATE SENSE

  • Jeong, Jae Ug
    • Journal of applied mathematics & informatics
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    • v.32 no.5_6
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    • pp.621-633
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    • 2014
  • In this paper, we introduce a general iterative algorithm for asymptotically quasi-${\phi}$-nonexpansive mappings in the intermediate sense to have the strong convergence in the framework of Banach spaces. The results presented in the paper improve and extend the corresponding results announced by many authors.

APPROXIMATE ADDITIVE MAPPINGS IN 2-BANACH SPACES AND RELATED TOPICS: REVISITED

  • YUN, SUNGSIK
    • Korean Journal of Mathematics
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    • v.23 no.3
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    • pp.393-399
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    • 2015
  • W. Park [J. Math. Anal. Appl. 376 (2011) 193-202] proved the Hyers-Ulam stability of the Cauchy functional equation, the Jensen functional equation and the quadratic functional equation in 2-Banach spaces. But there are serious problems in the control functions given in all theorems of the paper. In this paper, we correct the statements of these results and prove the corrected theorems. Moreover, we prove the superstability of the Cauchy functional equation, the Jensen functional equation and the quadratic functional equation in 2-Banach spaces under the original given conditions.

SOME CONVERGENCE THEOREMS FOR MAPPINGS OF ASYMPTOTICALLY QUASI-NONEXPANSIVE TYPE IN BANACH SPACES

  • Chang, Shih-sen;Yuying Zhou
    • Journal of applied mathematics & informatics
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    • v.12 no.1_2
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    • pp.119-127
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    • 2003
  • The purpose of this paper is to study the necessary and sufficient conditions for the sequences of Ishikawa iterative sequences with mixed errors of asymptotically quasi-nonexpansive type mappings in Banach spaces to converge to a fixed point in Banach spaces. The results presented in this paper extend and improve the corresponding results of[l-4, 7-9].

Teichmuller extremal mappings on the unit disk

  • Keum, J.H.;Lee, M.K.
    • Communications of the Korean Mathematical Society
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    • v.11 no.2
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    • pp.359-366
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    • 1996
  • In this paper, we provide two Teichm$\ddot{u}$ller extremal mappings of the unit disk, having different boundary values but the same dilatation.

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MULTIVALUED MIXED QUASI-VARIATIONAL-LIKE INEQUALITIES

  • Lee Byung-Soo
    • The Pure and Applied Mathematics
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    • v.13 no.3 s.33
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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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