It is necessary to construct an effective trust model to build trust relationship between peers in peer-to-peer （P2P） network and enhance the security and reliability of P2P systems. The current trust models only fo...It is necessary to construct an effective trust model to build trust relationship between peers in peer-to-peer （P2P） network and enhance the security and reliability of P2P systems. The current trust models only focus on the consumers＇ evaluation to a transaction, which may be abused by malicious peers to exaggerate or slander the provider deliberately. In this paper, we propose a novel trust model based on mutual evaluation, called METrust, to suppress the peers＇ malicious behavior, such as dishonest evaluation and strategic attack. METrust considers the factors including mutual evaluation, similarity risk, time window, incentive, and punishment mechanism. The trust value is composed of the direct trust value and the recommendation trust value. In order to inhibit dishonest evaluation, both participants should give evaluation information based on peers＇ own experiences about the transaction while computing the direct trust value. In view of this, the mutual evaluation consistency factor and its time decay function are proposed. Besides, to reduce the risk of computing the recommendation trust based on the recommendations of friend peers, the similarity risk is introduced to measure the uncertainty of the similarity computing, while similarity is used to measure credibility. The experimental results show that METrust is effective, and it has advantages in the inhibition of the various malicious behaviors.展开更多
目的探究优化型心理干预对老年糖尿病患者心理灵活性、行为习惯及血糖控制水平的影响。方法选取2018年4月—2021年4月于西部战区总医院干部病房收治的120例老年糖尿病患者为研究对象,使用随机数字表法分为对照组(n=60)和观察组(n=60)。...目的探究优化型心理干预对老年糖尿病患者心理灵活性、行为习惯及血糖控制水平的影响。方法选取2018年4月—2021年4月于西部战区总医院干部病房收治的120例老年糖尿病患者为研究对象,使用随机数字表法分为对照组(n=60)和观察组(n=60)。对照组患者实施常规护理,观察组患者在对照组基础上实施优化型心理干预。分析2组干预前、干预6个月后的心理灵活性[接纳与行动问卷第二版(AAQ-Ⅱ)、认知融合问卷(CFQ)]、行为习惯[糖尿病自我管理行为量表修订版(SDSCA)]、糖尿病控制水平[糖尿病控制状况评价量表(CSSD70)]、他人支持[领悟社会支持量表(PSSS)]及血糖[空腹血糖(FPG)、餐后2 h血糖(2 hBG)、糖化血红蛋白(HbA1c)]水平差异。结果干预6个月后,2组AAQ-Ⅱ、CFQ得分及FBG、2 h BG及HbA1c水平均较干预前下降,且观察组低于同期对照组(P均<0.05);干预6个月后,2组SDSCA、CSSD70、PSSS各维度得分较干预前上升,且观察组高于同期对照组(P均<0.05)。结论优化型心理干预可提升老年糖尿病患者心理灵活性,改善行为习惯及血糖控制水平,有利于加强他人支持程度。展开更多
基金supported by National Natural Science Foundation of China (No.60873231)Research Fund for the Doctoral Program of Higher Education (No.20093223120001)+2 种基金Science and Technology Support Program of Jiangsu Province (No.BE2009158)Natural Science Fund of Higher Education of Jiangsu Province(No.09KJB520010)Special Fund for Fast Sharing of Science Paper in Net Era by CSTD (No.2009117)
文摘It is necessary to construct an effective trust model to build trust relationship between peers in peer-to-peer （P2P） network and enhance the security and reliability of P2P systems. The current trust models only focus on the consumers＇ evaluation to a transaction, which may be abused by malicious peers to exaggerate or slander the provider deliberately. In this paper, we propose a novel trust model based on mutual evaluation, called METrust, to suppress the peers＇ malicious behavior, such as dishonest evaluation and strategic attack. METrust considers the factors including mutual evaluation, similarity risk, time window, incentive, and punishment mechanism. The trust value is composed of the direct trust value and the recommendation trust value. In order to inhibit dishonest evaluation, both participants should give evaluation information based on peers＇ own experiences about the transaction while computing the direct trust value. In view of this, the mutual evaluation consistency factor and its time decay function are proposed. Besides, to reduce the risk of computing the recommendation trust based on the recommendations of friend peers, the similarity risk is introduced to measure the uncertainty of the similarity computing, while similarity is used to measure credibility. The experimental results show that METrust is effective, and it has advantages in the inhibition of the various malicious behaviors.
文摘目的探究优化型心理干预对老年糖尿病患者心理灵活性、行为习惯及血糖控制水平的影响。方法选取2018年4月—2021年4月于西部战区总医院干部病房收治的120例老年糖尿病患者为研究对象,使用随机数字表法分为对照组(n=60)和观察组(n=60)。对照组患者实施常规护理,观察组患者在对照组基础上实施优化型心理干预。分析2组干预前、干预6个月后的心理灵活性[接纳与行动问卷第二版(AAQ-Ⅱ)、认知融合问卷(CFQ)]、行为习惯[糖尿病自我管理行为量表修订版(SDSCA)]、糖尿病控制水平[糖尿病控制状况评价量表(CSSD70)]、他人支持[领悟社会支持量表(PSSS)]及血糖[空腹血糖(FPG)、餐后2 h血糖(2 hBG)、糖化血红蛋白(HbA1c)]水平差异。结果干预6个月后,2组AAQ-Ⅱ、CFQ得分及FBG、2 h BG及HbA1c水平均较干预前下降,且观察组低于同期对照组(P均<0.05);干预6个月后,2组SDSCA、CSSD70、PSSS各维度得分较干预前上升,且观察组高于同期对照组(P均<0.05)。结论优化型心理干预可提升老年糖尿病患者心理灵活性,改善行为习惯及血糖控制水平,有利于加强他人支持程度。
