發(fā)布時間：2018-03-03 05:10

  本文選題：QoS管理　切入點：服務組合　出處：《桂林電子科技大學》2017年碩士論文　論文類型：學位論文

【摘要】：越來越多的組織和研究機構采用Web服務技術來實現(xiàn)數(shù)據(jù)共享和增值,使得部署在開放環(huán)境下的Web服務不斷涌現(xiàn)。已有的關于Web服務組合的研究工作大多以Web服務的QoS(Quality of Service)信息真實可靠為前提,認為服務提供商提供的QoS信息能夠反映服務的真實質(zhì)量信息。實際上,Web服務的QoS信息由于受到網(wǎng)絡負載以及地理位置的影響可能會不斷的發(fā)生變化。為了度量這種變化對服務的QoS指標帶來的影響,必須對服務的QoS信息進行實時監(jiān)控與收集。此外,已有的關于服務組合的研究工作大多以執(zhí)行代價最小或執(zhí)行時間最短為衡量指標,而忽略了組合服務的全局QoS約束。表征服務交付能力的質(zhì)量屬性,往往也是用戶所關心的,在Web服務組合系統(tǒng)中,這些屬性不應該被忽視。隨著組合效率得到日益關注,用戶對組合算法的搜索性能也提出了更高的期冀,服務組合過程必須在合理的時間內(nèi)給出響應。本文針對動態(tài)環(huán)境下基于QoS感知的服務組合系統(tǒng)的有效性及組合效率等問題,從QoS信息的監(jiān)測、服務組合過程建模及分析等方面進行了一些研究,主要研究工作包括以下幾個方面:(1)針對服務運行環(huán)境的復雜特點,并結(jié)合服務的QoS信息在運行過程中的動態(tài)多變的特性,給出了一個基于心智計算與合同網(wǎng)協(xié)議的多Agent協(xié)作模型與實現(xiàn),用于QoS信息的實時監(jiān)控,以支持Web服務運行過程中QoS信息的動態(tài)收集與更新;(2)提出了一種基于層次分析法的局部服務過濾策略,建立了“原子服務集合—QoS決策屬性—目標服務”結(jié)構的層次分析模型,依據(jù)服務的QoS信息對局部服務進行過濾,減少全局服務優(yōu)化選擇需要搜索的范圍;(3)為了保證組合服務能夠滿足全局QoS最優(yōu),提出了基于文化遺傳算法的服務組合策略來處理具有全局約束的服務組合問題,將遺傳算法作為文化算法的社會群體空間,并采用了多樣性保持與相似染色體排斥策略以擴大種群的多樣性和加快收斂速度,以保證服務組合系統(tǒng)的效率。最后通過實驗對本文提出的基于心智計算和合同網(wǎng)協(xié)議的多Agent協(xié)同的效率進行了驗證,同時驗證并分析了局部服務選擇對全局服務優(yōu)化的積極作用,并對基于改進文化遺傳算法在求解服務組合問題時的搜索效率和執(zhí)行時間進行了實驗和分析,實驗結(jié)果證明所提方法具有良好的可執(zhí)行性。
[Abstract]:More and more organizations and research institutions adopt Web services technology to achieve data sharing and value-added. Web services deployed in an open environment are constantly emerging. Most of the existing research work on Web services composition is based on the true and reliable QoS(Quality of Web services information. It is believed that the QoS information provided by the service provider can reflect the true quality information of the service. In fact, the QoS information of the web service may change continuously because of the influence of network load and geographical location. The impact of these changes on the QoS indicators of services, The QoS information of the service must be monitored and collected in real time. In addition, most of the research work on service composition is based on the minimum execution cost or the shortest execution time. The global QoS constraints of composite services are ignored. The quality attributes that characterize service delivery capabilities are often of concern to users. In Web service composition systems, these attributes should not be ignored. Users also have higher expectations for the search performance of the composition algorithm, and the service composition process must be responsive within a reasonable time. This paper aims at the effectiveness and composition efficiency of the service composition system based on QoS perception in dynamic environment. From the aspects of QoS information monitoring, service composition process modeling and analysis and so on, the main research work includes the following aspects: 1) aiming at the complex characteristics of service running environment, Combined with the dynamic and changeable characteristics of QoS information in service, a multi-#en1# cooperation model based on mental computing and contract net protocol is proposed, which can be used to monitor QoS information in real time. In order to support the dynamic collection and update of QoS information in the course of Web service operation, a local service filtering strategy based on AHP is proposed, and the hierarchical analysis model of "atomic service set-QoS decision attribute-target service" structure is established. Based on the QoS information of the service, the local service is filtered to reduce the scope of searching for global service optimization.) in order to ensure that the composite service can satisfy the global QoS optimization, A strategy of service composition based on cultural genetic algorithm is proposed to deal with the service composition problem with global constraints. The genetic algorithm is regarded as the social group space of the cultural algorithm. In order to expand the diversity and accelerate the convergence of the population, the strategies of diversity conservation and similar chromosome exclusion are adopted. In order to ensure the efficiency of the service composition system, the efficiency of multi-#en0# collaboration based on mental computing and contract net protocol is verified by experiments. At the same time, the positive effect of local service selection on global service optimization is verified and analyzed, and the search efficiency and execution time of the improved cultural genetic algorithm in solving service composition problems are tested and analyzed. The experimental results show that the proposed method is executable.
【學位授予單位】：桂林電子科技大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TP393.09

【相似文獻】

相關期刊論文 前10條

1 張煜,葛聲,孫海龍,馬殿富;Web服務組合處理系統(tǒng)的研究與實現(xiàn)[J];北京航空航天大學學報;2005年04期

2 孫潔麗;龔立群;;Web服務組合標準規(guī)范的研究[J];現(xiàn)代圖書情報技術;2007年05期

3 萬里平;蔡美玲;高春鳴;;基于服務聯(lián)盟的Web服務組合模型及方法[J];計算機工程與應用;2007年31期

4 郭峰;張萌;;Web服務組合的可靠性分析[J];系統(tǒng)仿真學報;2008年S2期

5 程永上;王志堅;;Web服務組合在水利領域中的應用[J];計算機工程與應用;2008年07期

6 陳世展;馮志勇;;服務網(wǎng)絡:Web服務組合的新基點[J];計算機應用研究;2008年05期

7 劉志紅;;Web服務組合的相關研究[J];農(nóng)業(yè)科技與裝備;2009年01期

8 熊偉;;Web服務組合綜述[J];信息化縱橫;2009年05期

9 曾偉;胡W，

本文編號：1559665