检索结果-南通市图书馆

A Hashing Power Allocation Game with and without Risk-free Asset

在线全文

学校读者我要写书评

暂无评论

Journal of Systems Science and Information 2021年第3期9卷 255-265页

作者： yukun cheng Donglei DU Qiaoming HAN School of Business Suzhou University of Science and TechnologySuzhou 215009China Faculty of Management University of New BrunswickNB CanadaFredericton E3B 9 Y2Canada School of Economics&Management Nanjing Tech UniversityNanjing 211800China

Miners in various blockchain-backed cryptocurrency networks compete to maintain the validity of the underlying distributed ledgers to earn the bootstrapped *** limited hashing power,each miner needs to decide how to allocate their resource to different cryptocurrencies so as to achieve the best overall *** all the miners form a hashing power allocation *** consider two settings of the game,depending on whether each miner can allocate their fund to a risk-free asset or *** show that this game admits unique pure Nash equilibrium in closed-form for both settings.

关键词： game and Nash equilibrium blockchain cryptocurrency mining risk-neutral risk-averse

The Evolutionary Equilibrium of Block Withholding Attack

在线全文

学校读者我要写书评

暂无评论

Journal of Systems Science and Information 2021年第3期9卷 266-279页

作者： yukun cheng Zhiqi XU Shuangliang YAO School of Business Suzhou University of Science and TechnologySuzhou 215009China Jiangsu University of Science and Technology Zhenjiang 212008China

Bitcoin is the most famous and the most used cryptocurrency in the world,such that it has received extreme popularity in recent *** the Bitcoin system is accompanied by different attacks,including the block withholding(BWH)*** a miner plays the BWH attack,it will withhold all the blocks newly discovered in the attack pool,damaging the honest miners’right to obtain the fair *** this paper,we consider a setting in which two miners may honestly mine or perform the BWH attack in a mining *** strategy profiles will bring different payoffs,in addition influence the selection of the ***,we establish an evolutionary game model to study the behavior tendency of the miners and the evolutionary stable strategies under different conditions,by formulating the replicator dynamic *** numerical simulations,we further verify the theoretical results on evolutionary stable solutions and discuss the impact of the factors on miners’strategic *** on these simulation results,we also make some recommendations for the manager and the miners to mitigate the BWH attack and to promote the cooperation between miners in a mining pool.

关键词： block withholding attack blockchain Bitcoin evolutionary game evolutionary stable strategies

Design, Synthesis and Ring-Opening Properties of a New Bipyridine Fused Rhodamine-Like Chelating Ligand and the Related Transition Metal Complexes

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemistry 2021年第6期39卷 1659-1666页

作者： Zhiyuan Qian yukun cheng Shunan Zhao Keith Man-Chung Wong Department of Chemistry Southern University of Science and TechnologyNo.1088Tangchang BoulevardNanshan District，ShenzhenGuangdong 518055China

A new bipyridine fused rhodamine-like chelating ligand and the corresponding transition metal complexes of platinum(Ⅱ)and iridi-um(Ⅲ)have been designed,synthesized and structurally characterized by X-ray *** photophysical properties and acid-or metal ion-promoted spirocarbon ring-opening properties have been *** platinum(Ⅱ)and iridium(Ⅲ)complexes show a drastic color change in solution with Hg^(2+) ions and emergency of an absorption band at around 450-600 nm,assignable to the absorption band of the ring-opened rhodamine-like *** platinum(Ⅱ)complex was suggested to undergo dissociation with Hg^(2+) ion,based on the corresponding absorption titration *** titration studies of iridium(Ⅲ)complexes were found to suffer from the quenching process,probably due to the presence of a lower-lying non-emissive excited state from the ring-opened form of ligand.

关键词： Rhodamine Transition metals Sensor Luminescence Bipyridine

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

区块截留攻击之演化博弈模型研究

西安电子科技大学学报 2020年第5期47卷 77-85,102页

作者：程郁琨许智琪苏州科技大学商学院江苏苏州215009

由于区块截留攻击现象的出现,对比特币网络安全性造成一定威胁,严重地损害了诚实矿工公平获益的权利。针对这种攻击行为,构建了区块截留攻击的演化博弈模型。考虑了矿工在有限理性条件下,其策略的动态演化趋势。利用复制动态推导出演化... 详细信息

由于区块截留攻击现象的出现,对比特币网络安全性造成一定威胁,严重地损害了诚实矿工公平获益的权利。针对这种攻击行为,构建了区块截留攻击的演化博弈模型。考虑了矿工在有限理性条件下,其策略的动态演化趋势。利用复制动态推导出演化稳定策略,分析矿工在矿池不同的监管与惩罚措施下的策略选择,并对矿池的监管措施提出相应的建议与对策。实验结果表明,矿池采取相对较低频率的监管和高罚款额的管理模式,能够有效地缓解区块截留攻击的发生。

关键词：区块截留攻击演化博弈比特币稳定策略

Mapping a stable adult-plant stripe rust resistance QTL on chromosome 6AL in Chinese wheat landrace Yibinzhuermai

在线全文

学校读者我要写书评

暂无评论

The Crop Journal 2022年第4期10卷 1111-1119页

作者： Mei Deng Li Long yukun cheng Fangjie Yao Fangnian Guan Yuqi Wang Hao Li Zhien Pu Wei Li Qiantao Jiang Yuming Wei Jian Ma Houyang Kang Pengfei Qi Jirui Wang Youliang Zheng Yunfeng Jiang Guoyue Chen State Key Laboratory of Crop Gene Exploitation and Utilization in Southwest China WenjiangChengdu 611130SichuanChina Triticeae Research Institute Sichuan Agricultural UniversityWenjiangChengdu 611130SichuanChina College of Agronomy Sichuan Agricultural UniversityWenjiangChengdu 611130SichuanChina

Stripe rust,caused by Puccinia striiformis ***(Pst),is one of the most important diseases threatening the yield and stability of wheat production in China and many other *** and utilization of new genes for durable stripe rust resistance are important for ongoing control of this *** objectives of this study were to identify quantitative trait loci(QTL)associated with adult-plant stripe rust resistance in the Chinese wheat landrace Yibinzhuermai(YBZR)and to provide wheat breeders with new sources of potentially durable resistance.A total of 117 recombinant inbred lines(RILs)(F5:8)derived from a cross between YBZR and highly susceptible cultivar Taichung 29(TC29)were assessed for stripe rust severity in field experiments at Wenjiang in 2016 and 2017 and Chongzhou in 2016,2017,2018,and 2019 in Sichuan following inoculation with a mixture of current Pst *** RILs were genotyped using the Wheat55K single nucleotide polymorphism(SNP)*** QTL were identified on chromosome arms 6AL,5BL and ***-6AL and ***-7DS conferred major effects in all field environments,explaining 10.6%to 14.7%and 11.5%to 21.2%of phenotypic variation,*** QTL on 5BL and 7DS likely correspond to previously known QTL,whereas ***-6AL is probably *** analysis revealed that the resistance allele at ***-6AL was present in 2.8%of 324 Chinese wheat *** markers closely linked with ***-6AL were converted to kompetitive allele-specific PCR markers and validated in the RIL population and a subset of 92 wheat ***-6AL and its markers should be useful in breeding programs to improve the level and durability of stripe rust resistance.

关键词： Puccinia striiformis QTL mapping Single nucleotide polymorphism Yellow rust

区间图上可带负权的2-中位选址问题(英文)

在线全文

学校读者我要写书评

暂无评论

运筹学学报 2010年第2期14卷 23-36页

作者：程郁琨上海大学数学系上海200444 浙江财经学院数学与统计学院杭州310018

Abstract本文研究了区间图上可带负权的2-中位选址问题.根据目标函数的不同,可带负权的p-中位选址问题(p≥2)可分为两类:即MWD和WMD模型;前者是所有顶点与服务该顶点的设施之间的最小权重距离之和,后者是所有顶点与相应设施之间的权重... 详细信息

Abstract本文研究了区间图上可带负权的2-中位选址问题.根据目标函数的不同,可带负权的p-中位选址问题(p≥2)可分为两类:即MWD和WMD模型;前者是所有顶点与服务该顶点的设施之间的最小权重距离之和,后者是所有顶点与相应设施之间的权重最小距离之和.在本篇论文中,我们讨论了区间图上可带负权2-中位选址问题的两类模型,并分别设计时间复杂度为O(n^2)的多项式时间算法.

关键词：运筹学选址问题中位问题可带负权区间图

Peroxidase activity gene TaPod-A7 and TaPod-A4 development of functional marker in wheat

在线全文

学校读者我要写书评

暂无评论

Peroxidase activity gene TaPod-A7 and TaPod-A4 development o...

融资约束与多产品出口企业的二元边际：基于中国企业层面的分析

第二十届中国作物学会学术年会

作者： Xinyuan Liu yukun cheng Yi Ren Yating Xue Hongwei Geng College of Agronomy Xinjiang Agricultural University/Xinjiang Engineering Research Center of High-quality Special Wheat Crops Key Laboratory of Crop Genetic Improvement and Germplasm Enhancement Xinjiang Agricultural University

The presence of peroxidase(POD) in wheat grain is a major factor affecting the colour of wheat flour and products, as well as the competitiveness of the wheat industry in China. Characterization of POD genes and the development of gene-specific markers is the key to molecular marker-assisted selection in common wheat breeding program. Because the full length of the wheat POD activity genes 7As and 4AL chromosomal genes have been cloned, in this study, we developed chromosome-specific functional markers for 7As and 4AL, POD-7As1 and POD-7As2, POD-4A1 and POD-4A2, which can amplify of 424bp,464bp, 542bp and 391bp in cultivars with lower and higher POD activity, respectively. POD-7As1 and POD-7As2 、POD-4A1and POD-4A2 were verified on 285 wheat cultivars(lines), and showed extremely significant(P < 0.01) associations with POD activities. 285 winter wheat varieties(lines) from both domestic and overseas were tested and found Ta Pod-A7b/TaPod-A4b/TaPodD1b(POD activity of 737.12U/(***)) was significantly higher than Ta Pod-A7a/TaPod-A4a/TaPod-D1a(POD activity of 646.64 U/(***)). The conclude that combinations of superior allelic variants and its functional marker provide effective support for wheat quality improvement and identification.

关键词：

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

南方经济 2014年第10期43卷 63-81页

作者：程玉坤周康暨南大学经济学院 510632

本文通过匹配2002-2006年中国工业企业数据库和中国海关进出口数据库,将各个出口企业贸易额分解为出口广度和深度两部分,研究多产品出口企业融资约束与出口行为之间的关系,研究发现:(1)融资约束阻碍了我国出口企业出口总额、出口深度以... 详细信息

本文通过匹配2002-2006年中国工业企业数据库和中国海关进出口数据库,将各个出口企业贸易额分解为出口广度和深度两部分,研究多产品出口企业融资约束与出口行为之间的关系,研究发现:(1)融资约束阻碍了我国出口企业出口总额、出口深度以及平均出口广度的增长;(2)融资约束对民营企业的出口行为影响最大,之后是外资企业和国有企业;(3)与中东部地区相比,西部地区企业的出口行为对融资约束的敏感程度大得多。

关键词：融资约束多产品出口企业二元边际企业异质性

追踪前沿立足实践创新理论——陈玉琨学术思想发展轨迹研究

在线全文

学校读者我要写书评

暂无评论

国家教育行政学院学报 2005年第11期 13-19页

作者：陈玉琨学术思想研究课题组陈玉琨学术思想研究课题组

陈玉琨学术思想是从教育的技术研究走向理论研究、从教育理论的借鉴走向教育理论的创新、从教育具体领域的研究走向教育基本理论的研究的。其学术思想发展的轨迹对青年学者的成长颇有启示意义。

关键词：陈玉琨学术思想发展轨迹