Contract is a common and effective mechanism for supply chain coordination,which has been studied extensively in recent years.For a supply chain network model,contracts can be used to coordinate it because it is too i...Contract is a common and effective mechanism for supply chain coordination,which has been studied extensively in recent years.For a supply chain network model,contracts can be used to coordinate it because it is too ideal to obtain the network equilibrium state in practical market competition.In order to achieve equilibrium,we introduce revenue sharing contract into a supply chain network equilibrium model with random demand in this paper.Then,we investigate the influence on this network equilibrium state from demand disruptions caused by unexpected emergencies.When demand disruptions happen,the supply chain network equilibrium state will be broken and change to a new one,so the decision makers need to adjust the contract parameters to achieve the new coordinated state through bargaining.Finally,a numerical example with a sudden demand increase as a result of emergent event is provided for illustrative purposes.展开更多
针对现有智能合约漏洞检测方法准确率低以及对合约源代码特征提取不足的问题,该文提出一种基于预训练BERT模型(Bidirectional Encoder Representations from Transformer,BERT)和混合神经网络串行的智能合约漏洞检测方案SCVD-PBHNN。首...针对现有智能合约漏洞检测方法准确率低以及对合约源代码特征提取不足的问题,该文提出一种基于预训练BERT模型(Bidirectional Encoder Representations from Transformer,BERT)和混合神经网络串行的智能合约漏洞检测方案SCVD-PBHNN。首先,对源代码进行数据预处理,去除冗余信息,保留源代码中的关键语句信息;其次,利用BERT模型替换了传统的静态词嵌入模型,深入挖掘智能合约源代码的语义特征;然后,结合文本卷积神经网络(Text Convolutional Neural Network,TextCNN)和双向长短期记忆网络(Bi-directional Long Short-Term Memory,BiLSTM)混合神经网络构建特征提取层,对传入的词向量进行训练,充分提取源代码上下文信息和局部关键特征;最后,通过激活函数对特征向量进行归一化处理,实现漏洞检测与识别。实验结果表明,该方案在准确率、精确率、召回率以及F1值等评价指标上相比已有方案均有明显提升,能准确识别四种常见的漏洞,准确率分别为94.40%、93.72%、96.29%、93.53%。展开更多
基金supported by the National Key Technology R&D Program of China (No. 2006BAH02A06)"333 Engineering"Project of Jiangsu Province
文摘Contract is a common and effective mechanism for supply chain coordination,which has been studied extensively in recent years.For a supply chain network model,contracts can be used to coordinate it because it is too ideal to obtain the network equilibrium state in practical market competition.In order to achieve equilibrium,we introduce revenue sharing contract into a supply chain network equilibrium model with random demand in this paper.Then,we investigate the influence on this network equilibrium state from demand disruptions caused by unexpected emergencies.When demand disruptions happen,the supply chain network equilibrium state will be broken and change to a new one,so the decision makers need to adjust the contract parameters to achieve the new coordinated state through bargaining.Finally,a numerical example with a sudden demand increase as a result of emergent event is provided for illustrative purposes.
