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A blockchain-oriented covert communication technology with controlled security level based on addressing confusion ciphertext

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Frontiers of Computer Science 2025年第2期19卷 133-135页

作者： Lejun ZHANG Bo ZHANG Ran GUO Zhujun WANG Guopeng WANG Jing QIU Shen SU Yuan LIU Guangxia XU Zhihong TIAN Sergey GATAULLIN Cyberspace Institute Advanced Technology Guangzhou UniversityGuangzhou 510006China Research and Development Center for E-Learning Ministry of EducationBeijing 100039China College of Information Engineering Yangzhou UniversityYangzhou 225009China School Math and Computer Science Quanzhou Normal UniversityQuanzhou 362000China Pazhou Lab Guangzhou 510330China School of Physics and Materials Science Guangzhou UniversityGuangzhou 510006China Central Economic and Mathematics Institute Russian Academy of SciencesMoscow 117418Russia Industrial Programming Department MIREA-Russian Technological UniversityMoscow 119454Russia

1 Introduction Traditional covert communication[1]usually relies on centralized channels,which are efficient in transmission but susceptible to eavesdropping and attacks,leading to information ***,distributed methods also exist,such as peer-to-peer networks and distributed hash *** technology,which is decentralized,anonymous,non-tamperable and anti-attack,can be applied to covert communication to solve the problems of traditional methods and improve the quality of communication.

关键词： communication tables networks

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Cyclical oscillations and absorbing-state probabilities in optional public goods games: Interplay of reward and group size

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Physical Review E 2025年第1期111卷 014138-014138页

作者： Eduardo V. Stock Pablo Valverde Juan Carlos González-Avella José Roberto Iglesias Sebastian Gonçalves Roberto da Silva Instituto de Física Universidade Federal do Rio Grande do Sul Caixa Postal 15051 91501-970 Porto Alegre RS Brazil Pontificia Universidad Católica del Ecuador Facultad de Ciencias Exactas y Naturales Quito 170525 Ecuador Institute for Cross-Disciplinary Physics and Complex Systems UIB-CSIC Palma de Mallorca 07122 Spain Advanced Programming Solutions SL Palma de Mallorca 07120 Spain Instituto Nacional de Ciência e Tecnologia de Sistemas Complexos CBPF Rio de Janeiro 22290-180 RJ Brazil

The optional public goods game (OPGG) is a three-strategy model in which individuals can cooperate, defect, or not participate. Despite its simplicity, this model effectively captures various social dilemmas, including those involving public services, environmental sustainability, and broader societal issues. In this study, we investigate how the reward (r) and group size of potential players (S) of public goods games influence the steady-state coexistence of these strategies or the alternation of their dominance in a rock-paper-scissors dynamic. The OPGG is simulated using Monte Carlo in a nonspatial scenario, meaning there is no topology connecting the agents, allowing any player to interact with any other player. We show that under sufficiently noisy conditions, the system consistently evolves to an absorbing state, with the prevailing strategy determined by the values of r and S. In the range 2≤r≤S, the system shows multiple stable absorbing states, with groups of size S=4 exhibiting more pronounced and transient rock-paper-scissors dynamics with longer average absorbing times. We present a thorough analysis of our results in terms of the fraction of time the system spends in rock-paper-scissor cycles, the number of cycles, and the average probability that the system relaxes to each possible absorbing state, including scenarios where the system does not reach an absorbing state at all.

关键词： Risk assessment

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Aerodynamic Analysis of Delta Wing Aircraft and Effect of the Propeller Using OpenFOAM

Aerodynamic Analysis of Delta Wing Aircraft and Effect of th...

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2023 Ivannikov ISPRAS Open Conference, ISPRAS 2023

作者： Mkoyan, Ruslan Romanova, Daria Sargsyan, Sevak Epikhin, Andrey Russian-Armenian University Ivannikov Institute for System Programming of the Ras Center of Advanced Software Technologies Yerevan Armenia Ivannikov Institute for System Programming of the Ras Lomonosov Msu Moscow Russia Ivannikov Institute for System Programming of the Ras Moscow Russia

ISBN: (纸本)9798350349993

This paper presents a calculation of the aerodynamic characteristics of the ZOHD Alpha Strike UAV model, designed with a delta wing. The focus of the study is the overall layout of the aircraft and the influence of the propeller on its aerodynamic characteristics. The computational fluid dynamics tool OpenFOAM is used as an effective method to solve the complex aerodynamic problems inherent in this UAV model. Research is carried out in an incompressible flow, due to the low speeds inherent in such aircraft. A numerical methodology is proposed for quick evaluation of the aerodynamic performances of UAV models with a propeller. A simple dynamic model and flight data are presented. The calculation results are verified using a flight experiment. © 2023 IEEE.

关键词： Computational fluid dynamics

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AN EFFICIENT COMPUTATION OF RIGHT CONTEXT FOR LR-BASED ERROR REPAIR

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INFORMATION PROCESSING LETTERS 1994年第2期49卷 63-71页

作者： JUNG, MS CHOE, KM HAN, T Programming Languages Laboratory Department of Computer Science Korea Advanced Institute of Science and Technology 373-1 Kusong-Dong Yusong-Gu Taejon 305-701 South Korea

The left context in LR-based parsing is the sequence of states in the parsing stack. The right context is the vocabulary strings to appear for a given left context. We propose an efficient method of computing right context for LR-based syntax error repair. The efficiency of our method is achieved from removing some redundancies in the method of previous work.

关键词： COMPILERS LR PARSING SYNTAX ERROR REPAIR KERNEL ITEM RIGHT CONTEXT

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STATIC FILTERING ON STRATIFIED PROGRAMS

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INFORMATION PROCESSING LETTERS 1993年第5期47卷 237-244页

作者： CHANG, BM CHOE, KM HAN, TS Programming Languages Laboratory Department of Computer Science Korea Advanced Institute of Science and Technology 373-1 Kusong-dong Yusung-ku Taejon 305-701 South Korea

We extend static filtering in [8], a query optimization strategy based on seminaive evaluation on system graphs, so that it can efficiently handle stratified programs without extra overhead. The computation of static filters is formalized as a transformation so that the least fixed point of the transformation can be the static filters. The static filtering on stratified programs is shown to be complete with respect to the iterated fixed point semantics.

关键词： APPLICATIVE (LOGIC) programming STRATIFIED PROGRAMS QUERY OPTIMIZATION STATIC FILTERING SYSTEM GRAPHS

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SYNTACTIC ERROR REPAIR USING REPAIR PATTERNS

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INFORMATION PROCESSING LETTERS 1993年第4期47卷 189-196页

作者： YUN, IS CHOE, KM HAN, T Programming Languages Laboratory Department of Computer Science Korea Advanced Institute of Science and Technology 373-1 Kusong-Dong Yusung-Cu Taejon 305-701 South Korea

A syntactic error repair model is proposed, and is defined as a partial function from strings to sentences. The replacement of a substring of a string with a substring of a sentence is described by a repair pattern, which is roughly a pair of strings of grammar symbols. The model can be efficient with some restriction on repair patterns. An LR-based implementation of the model is discussed.

关键词： COMPILERS SYNTACTIC ERROR RECOVERY SYNTACTIC ERROR REPAIR MODEL REPAIR PATTERN

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YET ANOTHER EFFICIENT BACKWARD EXECUTION ALGORITHM IN THE AND OR PROCESS MODEL

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INFORMATION PROCESSING LETTERS 1991年第4期40卷 201-211页

作者： KIM, DH CHOE, KM Programming Languages Laboratory Department of Computer Science Korea Advanced Institute of Science and Technology 371-1 Kusong-Dong Yusang-Gu Taejon 305-701 South Korea

An efficient backward execution algorithm in the AND/OR Process Model for parallel evaluation of logic programs is proposed. The efficiency of the algorithm is achieved by means of information acquired during execution of clauses. The algorithm is considered to be efficient in the sense that it issues fewer number of cancel messages and avoids unnecessary resetting operations. Furthermore, it performs independent redoing and resetting more concurrently than other related works.

关键词： APPLICATIVE (LOGIC) programming PARALLEL EVALUATION OF LOGIC PROGRAMS AND OR PROCESS MODEL AND PARALLELISM BACKWARD EXECUTION ALGORITHM MULTIPLE FAILURE SELECTIVE RESETTING

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The design and optimisation of a UCAV wing manufactured using advanced composite materials

The design and optimisation of a UCAV wing manufactured usin...

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Proceedings of the Third International Conference on Engineering Computational Technology

作者： Jonson, D. Jordan, K. Centre for Advanced Materials Design and Manufacturing Programming Durban Institute of Technology Durban South Africa

ISBN: (纸本)0948749857

The results of a study aimed at investigating the conceptual design for the composite wings of the prototype UCAV-TD aircraft is presented. The work is focused on identifying an appropriate structural configuration as well as addressing the optimization of the structural design of the wing when subjected to the typical aerodynamic pressure of the structural design of the wing when subjected to the typical aerodynamic pressure loading encountered at the upper edge of the operational envelope. The results of the optimization indicated that the multi-spar arrangement of the radial configuration is more efficient in limiting the deflection of the wing, thereby allowing for a reduction in wing skin thickness.

关键词： Structural optimization

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Gradient Method Optimization of a Race Car Wing Airfoil at the Conceptual Design Phase 8th

Gradient Method Optimization of a Race Car Wing Airfoil at t...

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8th International Conference on Industrial Engineering, ICIE 2022

作者： Korobko, D.D. Mikaeva, S.A. Institute of Advanced Technologies and Industrial Programming of RTU MIREA 78 Vernadsky Avenue Moscow119454 Russia

ISBN: (纸本)9783031141249

Racecar wing airfoil optimization at the concept modeling stage based on NACA series airfoils with gradient descent method and finite volume method of aerodynamic characteristics calculation was studied. For efficiency estimation of the method, the problem of downforce coefficient maximization of the airfoil at zero angle of attack was considered. Simulations were performed using Open FOAM, which is an open source CFD software based on a finite volume method. The Spalart-Allmaras turbulence model was chosen for a steady-state two dimensional CFD analysis of an airfoil. Blockmesh utility was used for structured mesh generation. Airfoil parameterization, mesh generation, numerical simulation and optimization routine are automated with Python script. This study showed that gradient descent method optimization required low number of iterations for this type of problem. The goal of the algorithm was achieved and some high-downforce airfoils were found. The methodology could be used to carry out further optimization studies of many parameterized shapes for many different applications. © 2023, The Author(s), under exclusive license to Springer Nature Switzerland AG.

关键词： Optimization

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Note on the complement of a (minimal) linear language

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Information and Control 1964年第3期7卷 307-314页

作者： Haines, L.H. Department of Mathematics Massachusetts Institute of Technology Cambridge MA United States Advanced Programming Development IBM White Plains NY United States

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