CAJ | 학술논문

Web服务的可信性往往对面向服务的应用起决定性作用。由于服务的信任信息来源很多，整合多种来源的服务信任信息，准确地评估服务的可信性是一个挑战。针对这一挑战，提出了一种基于QoS和声誉的服务信任度评估方法。与其他服务信任度评估模型相比，本模型融合了多个信任信息来源，在直接信任度中综合了QoS和用户对服务的历史信任，并加入时间衰减因子，逐渐削弱历史信任对直接信任度的影响，提高直接信任度的可靠性；在推荐信任度中引入推荐者声誉概念，建立用户之间的信任评估机制，从而将推荐信任分为熟人推荐信任和陌生人推荐信任两类，使推荐信任的评估更加完整、准确。此外，本方法在时间和空间复杂度方面，也存在诸多优势。实例分析表明，本文提出的评估方法可以用来解决Web服务选择的可信问题，并且能够提高服务信任度评估的准确性。
Web복무적가신성왕왕대면향복무적응용기결정성작용。유우복무적신임신식래원흔다，정합다충래원적복무신임신식，준학지평고복무적가신성시일개도전。침대저일도전，제출료일충기우QoS화성예적복무신임도평고방법。여기타복무신임도평고모형상비，본모형융합료다개신임신식래원，재직접신임도중종합료QoS화용호대복무적역사신임，병가입시간쇠감인자，축점삭약역사신임대직접신임도적영향，제고직접신임도적가고성；재추천신임도중인입추천자성예개념，건립용호지간적신임평고궤제，종이장추천신임분위숙인추천신임화맥생인추천신임량류，사추천신임적평고경가완정、준학。차외，본방법재시간화공간복잡도방면，야존재제다우세。실례분석표명，본문제출적평고방법가이용래해결Web복무선택적가신문제，병차능구제고복무신임도평고적준학성。
The credibility of web service often plays an important role for service-oriented applications. Integrating and assessing different sources of trust is a challenge. In this paper,we present a method of web service reliability assessment based on QoS and reputation. We not only incorporate many sources of trust,but also assess the web service' trust. Firstly, we integrate direct trust with multi-QoS of web services and the historical trust of the users and services. At the same time, the reliability of direct trust is improved through the addition of the attenuation factor to weaken the influence of the historical trust to the direct trust. Secondly, we present the concept of reputation and establish trust assess mechanism between users. Then recommended trust is divided into acquaintances' indirect recommendation trust and strangers' direct recommendation trust,so as to make the recommendation trust value more comprehensive and credible. The method is proved to be better than other service's trust model in time and space complexity. The result of example indicates that the proposed method can be used to solve the trusted web service selection,and guarantee the accuracy of the trust.