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code Equivalences Between Network codes With Link Errors and index codes With Side Information Errors

IEEE ACCESS 2019年 7卷 54144-54154页

作者： Kim, Jae-Won No, Jong-Seon Seoul Natl Univ Dept Elect & Comp Engn INMC Seoul 08826 South Korea

In this paper, new code equivalence relationships between a network code and an index code are studied. First, for a given index coding instance, equivalent network coding instances are derived, where an index code achieving the maximum acyclic induced subgraph bound is converted to the corresponding network code and vice versa. Then, the code equivalence results are generalized to erroneous cases for both a given network coding instance and a given index coding instance, that is, code equivalences between a network code with link errors and an index code with side information errors.

关键词： index code index code with side information errors (ICSIE) network code network code with link errors (NCLE) side information side information graph

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Multihop Caching-Aided coded Multicasting for the Next Generation of Cellular Networks

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IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY 2017年第3期66卷 2576-2585页

作者： Kiskani, Mohsen Karimzadeh Sadjadpour, Hamid R. Univ Calif Santa Cruz Dept Elect Engn Santa Cruz CA 95064 USA

The next generation of cellular networks deploying wireless distributed femtocaching infrastructure proposed by Golrezaei et al. is studied. By taking advantage of multihop communications in each cell, the number of required femtocaching helpers is significantly reduced. This reduction is achieved by using underutilized storage and communication capabilities in user terminals, which results in reducing the deployment costs of distributed femtocaches. A multihop index coding technique is proposed to code the cached contents in helpers to achieve orderoptimal capacity gains. As an example, we consider a wireless cellular system in which contents have a popularity distribution and demonstrate that our approach can replace many unicast communications with multicast communication. We will prove that simple heuristic linear index code algorithms based on graph coloring can achieve order-optimal capacity under Zipfian content popularity distribution.

关键词： Cellular networks femtocache index code

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User-Cache Aided Transmission With index Coding in K-User Downlink Channels

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IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS 2019年第12期18卷 6043-6058页

作者： Son, Kyungrak Lee, Jung Hoon Choi, Wan Korea Adv Inst Sci & Technol Sch Elect Engn Daejeon 34141 South Korea HUFS Dept Elect Engn Yongin 17035 South Korea HUFS Appl Commun Res Ctr Yongin 17035 South Korea

This paper considers a single-input single-output broadcast channel with receiver side information. We find the optimal clique cover index code and the optimal transmission time allocation that minimize outage probability when total transmission time is limited. As our problem is NP-hard, we first find the optimal time allocation for a given index code. Then, we describe a brute-force algorithm that finds the set of all decodable index codes and chooses the optimal one adopting the optimal time allocation. To reduce the computational complexity of the brute-force algorithm, we propose a pruning algorithm which solves the same problem using the Hasse diagram but does not harm the optimality. Our analysis reveals that the optimal index code is dependent on the channel conditions, not simply on the number of required transmissions, which implies that the index coding-channel coupling improves the outage performance. It is also shown that this claim is still valid for general scalar linear index coding. Our simulation results verify that our proposed schemes effectively reduce the outage probability compared to other reference schemes, and our pruning algorithm considerably reduces the computational complexity required for the brute-force algorithm.

关键词： index code content delivery content caching time allocation outage probability

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INVESTIGATION OF ALPHA-PARTICLE INDUCED REACTIONS ON THULIUM

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PRAMANA-JOURNAL OF PHYSICS 1992年第3期38卷 279-290页

作者： RAO, AVM MUKHERJEE, S RAO, JR VIKRAM UNIV SCH STUDIES PHYSUJJAIN 456010MADHYA PRADESHINDIA BANARAS HINDU UNIV DEPT PHYSVARANASI 221005UTTAR PRADESHINDIA

Alpha particle induced reactions on the target element thulium were investigated up to 75 MeV, using foil-stack activation technique and Ge(Li) gamma ray spectroscopy method. Excitation functions for eight reactions of the type Tm-169(alpha, xn), x = 1-4;Tm-169(alpha, pxn), x = 3;and Tm-169(alpha, alpha-xn), x = 1,2,4 were investigated. Of these, four reactions Tm-169(alpha, p3n), Tm-169(alpha, alpha-n), Tm-169(alpha, alpha-2n) Tm-169(alpha, alpha-4n), were studied for the first time and in the remaining four reactions, some 19 new energy-point cross-sections were measured for the first time. The experimental cross-sections were compared with the predictions of pre-equilibrium hybrid model, as well as the more recent index model, using the initial exciton number, n0 = 4 (4p0h). Both the models show better agreement in respect of (alpha, xnyp) type of reactions. However they are equally bad for (alpha, alpha-xn) type of reactions which involve the alpha-particle in the exit channels, and for which some direct reaction contributions are indicated.

关键词： HYBRID MODEL index MODEL STACKED-FOIL ACTIVATION TECHNIQUE PREEQUILIBRIUM DECAY ALICE 85 300 code index code

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ALPHA-PARTICLE INDUCED REACTIONS ON COPPER AND TANTALUM

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PRAMANA-JOURNAL OF PHYSICS 1991年第1期36卷 115-123页

作者： RAO, AVM MUKHERJEE, S RAO, JR BANARAS HINDU UNIV DEPT PHYSVARANASI 221005UTTAR PRADESHINDIA

Alpha particle induced reactions in the target elements copper and tantalum were studied. The excitation functions of Cu-63(alpha, n) + Cu-65(alpha, 3n), Cu-65(alpha, 2n), Ta-181(alpha, 2n) and Ta-181(alpha, 4n) were measured up to 75 MeV. Eight new energy point cross-sections were measured for the first time. The experimental results were compared with the predictions of updaed hybrid model (ALICE/85/300) as well as with index model using the initial exciton number n(o) = 4 (4poh) and level density parameter, a = A/8. A general agreement was found for all the reactions with both the models.

关键词： HYBRID MODEL index MODEL STACKED-FOIL ACTIVATION TECHNIQUE PREEQUILIBRIUM DECAY ALICE/85/300 code index code

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Improvement of Extended Least Difference Greedy Clique-Cover Algorithm for index Coding 9

Improvement of Extended Least Difference Greedy Clique-Cover...

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9th International Conference on Information and Communication Technology Convergence (ICTC)

作者： Lee, Joon-Woo Kim, Jae-Won No, Jong-Seon Seoul Natl Univ INMC Dept Elect & Comp Engn Seoul South Korea

ISBN: (纸本)9781538650417

We modify the heuristic algorithm proposed by Kwak, et al., called the extended least difference greedy (ELDG) algorithm, to make it more efficient. The column-merging heuristic algorithm, which is one of the essential parts in the ELDG algorithm, is found numerically not to be efficient for reducing the index codelength;besides, the result of the column-merging heuristic algorithm can be even longer than that of the original LDG algorithm. We detect when the column-merging heuristic algorithm give worse result than the result of the original LDG algorithm. Modified slightly, the proposed column-merging heuristic algorithm becomes efficient for reducing codelength. Additionally, we add the cycle-of-p-nodes detection algorithm, which is the generalized version of the cycle-of-three-node detection algorithm in the ELDG algorithm. It is numerically shown that roughly 20% of the index codelength reduction is achieved by the proposed ELDG algorithm compared to the LDG algorithm, while the conventional ELDG algorithm shows 10% of reduction rate compared to the LDG algorithm.

关键词： index code least difference greedy clique-cover algorithm

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An Improved Functional Hierarchy Frame Model for System Maintainability

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International Journal of Plant Engineering and Management 2003年第4期8卷 215-219页

作者： CHEN Dai Lin, CHEN Dong lin, WANG Ru gen, ZHU Xue ping College of Engineering, Air Force University of Engineering, Xi′an 710038, P.R.China College of Engineering Air Force University of Engineering Xi′an 710038 P.R.China

By means of analogy, this paper analyses the present functional hierarchyframe model for system maintainability, and presents an improved model. Practical applicationindicates that the improved model is visualized, mo... 详细信息

关键词： maintainability frame model index code maintenance code

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