本文選題：Web服務(wù)組合 + 服務(wù)發(fā)現(xiàn)　； 參考：《濟(jì)南大學(xué)》2014年碩士論文

【摘要】：Web服務(wù)作為面向服務(wù)體系架構(gòu)(SOA)和面向服務(wù)計(jì)算(SOC)的實(shí)現(xiàn)，以其自描述、跨平臺(tái)、松耦合等特性，已成為企業(yè)業(yè)務(wù)流程集成的一個(gè)重要機(jī)制。隨著Web服務(wù)技術(shù)的發(fā)展，越來越多的企業(yè)將自己的業(yè)務(wù)流程打包成Web服務(wù)，這些Web服務(wù)在功能、質(zhì)量等方面不盡相同。Web服務(wù)組合技術(shù)的出現(xiàn)解決了細(xì)粒度的單一Web服務(wù)難以滿足復(fù)雜業(yè)務(wù)邏輯的矛盾，最大限度地提高了現(xiàn)有Web服務(wù)的可重用性和使用靈活性。 Web服務(wù)組合技術(shù)的關(guān)鍵環(huán)節(jié)是如何根據(jù)用戶需求，找到能夠?qū)崿F(xiàn)其業(yè)務(wù)邏輯的候選服務(wù)集，并從中選擇用以組合的最優(yōu)Web服務(wù)�，F(xiàn)有的關(guān)于服務(wù)發(fā)現(xiàn)的主要工作，大多都假定已給定完成Web服務(wù)組合所需的各類功能相似、服務(wù)質(zhì)量不同Web服務(wù)集，基于全局或局部QoS最優(yōu)的方法進(jìn)行服務(wù)發(fā)現(xiàn)與服務(wù)選擇，但對(duì)候選服務(wù)集的構(gòu)造以及用戶QoS偏好方面研究有所欠缺。此外，用戶有時(shí)候真正關(guān)心的是Web服務(wù)的一些具體內(nèi)容細(xì)節(jié)信息，服務(wù)發(fā)現(xiàn)的過程中應(yīng)該體現(xiàn)這些細(xì)節(jié)信息；語(yǔ)義Web技術(shù)，，比如語(yǔ)義Web服務(wù)描述語(yǔ)言O(shè)WL-S，可以描述這類細(xì)節(jié)信息，但語(yǔ)義Web服務(wù)本身也有很大局限。 針對(duì)現(xiàn)有工作的局限性，本文從三個(gè)方面考慮基于用戶需求的Web服務(wù)發(fā)現(xiàn)與選擇問題： (1)基于功能層面的服務(wù)發(fā)現(xiàn)。解決用戶的業(yè)務(wù)邏輯需求可以由哪些抽象服務(wù)類實(shí)現(xiàn)的問題，最終目的是得到針對(duì)用戶需求的候選服務(wù)集；候選服務(wù)集的建立為后續(xù)服務(wù)選擇的進(jìn)行提供基礎(chǔ)。 (2)基于服務(wù)質(zhì)量QoS的服務(wù)選擇。建立組合QoS權(quán)重表達(dá)模型，根據(jù)用戶對(duì)QoS屬性的偏好和專家打分得到不同屬性的權(quán)重；通過構(gòu)造遺傳算法，從全局的角度考慮Web服務(wù)組合的用戶QoS滿意度，并以此對(duì)候選服務(wù)集進(jìn)行選擇。 (3)基于服務(wù)內(nèi)容的服務(wù)選擇。提出并建立Web服務(wù)內(nèi)容表達(dá)模型，通過計(jì)算服務(wù)賦值向量和用戶的需求向量之間相似度的方法，確定某一Web服務(wù)是否能夠滿足用戶對(duì)服務(wù)內(nèi)容方面的要求，并以此為依據(jù)對(duì)候選服務(wù)集進(jìn)行過濾。 基于功能層面的服務(wù)發(fā)現(xiàn)形成候選服務(wù)集。在候選服務(wù)集的基礎(chǔ)上，綜合應(yīng)用基于QoS和基于服務(wù)內(nèi)容的服務(wù)選擇，最終可得到功能層面、服務(wù)質(zhì)量層面和服務(wù)內(nèi)容層面最大程度符合用戶需求的Web服務(wù)組合。這在總體上實(shí)現(xiàn)了一個(gè)Web服務(wù)發(fā)現(xiàn)與選擇的層次模型，本文在最后討論了該模型的利弊，并提出了另外一種可能的模型——解析模型的思路和需要解決的問題。
[Abstract]:As the realization of SOA (Service-Oriented Architecture) and SOC (Service-Oriented Computing), Web Services has become an important mechanism of business process integration for its self-description, cross-platform, loose-coupling and so on. With the development of Web services technology, more and more enterprises are packaging their business processes into Web services, which are functional, The emergence of Web service composition technology solves the contradiction that the fine-grained single Web service is difficult to satisfy the complex business logic, and improves the reusability and flexibility of the existing Web service to the maximum extent. The key link of Web service composition technology is how to find the candidate service set which can realize its business logic according to the user's demand, and select the optimal Web service to compose from it. Most of the existing work on service discovery assumes that all kinds of functions that have been given to complete Web service composition are similar, that the quality of service is different in Web service set, and that service discovery and service selection are based on global or local QoS optimal methods. However, there is a lack of research on candidate service set construction and user QoS preference. In addition, sometimes what users really care about is some specific details of Web services, which should be reflected in the process of service discovery; semantic Web technologies, such as the semantic Web Services description language OWL-S, can describe such details. But semantic Web services themselves are also very limited. In view of the limitations of the existing work, this paper considers the problem of Web service discovery and selection based on user requirements from three aspects: Service discovery based on function level. To solve the problem of which abstract service classes the business logic requirements of users can be implemented, the ultimate goal is to obtain candidate service sets for users' needs, and the establishment of candidate service sets provides the basis for the subsequent service selection. Service selection based on quality of Service (QoS). The weight representation model of composite QoS is established, and the weight of different attributes is obtained according to the user's preference for QoS attribute and the expert score. By constructing genetic algorithm, the user satisfaction degree of Web service composition is considered from the global point of view. Then the candidate service set is selected. Service selection based on service content. A Web service content representation model is proposed and established. By calculating the similarity between the service assignment vector and the user's requirement vector, it is determined whether a Web service can meet the requirements of the user for the content of the service. Based on this, the candidate service set is filtered. Service discovery based on function level forms candidate service set. On the basis of candidate service set, the Web service composition based on QoS and service content can be obtained by synthesizing the choice of service based on QoS and service content, and the function level, quality of service level and service content level can be obtained. In the end, this paper discusses the advantages and disadvantages of this model, and puts forward another possible model-analytic model and the problems that need to be solved.
【學(xué)位授予單位】：濟(jì)南大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TP393.09

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