• Title/Summary/Keyword: service composition

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A Study on Service Composition Using Case-Based Reasoning (사례 기반 추론을 이용한 서비스 컴포지션 연구)

  • Kim, Kun-Su;Lee, Dong-Hoon;Park, Doo-Kyung;Lee, Jee-Hyong
    • Journal of the Korean Institute of Intelligent Systems
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    • v.18 no.2
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    • pp.175-182
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    • 2008
  • Context-aware service environment should provide many kinds of services according to users' requests. Users want a great variety of services. In response to their demands the service provider should make a new service every time. But making a new service every time may be inefficient even for a small number of users' requests. So, there are studies on how to efficiently support various and complex requests fFom users. In many researches, service compositions have lately attracted considerable attention. However, existing researches have mainly focused on Web services. So they are not proper to rapidly providing services in response to users' requests, especially In context-aware service environment. This paper proposes a rapid service composition using case-based reasoning. For evaluating the proposed algorithm we implement 'purchasing seTvice agent'. With this system, we compare our algorithm and the existing service composition algorithms.

Analyzing of Requirements for Semantic Web Service Composition (시멘틱 웹 서비스 합성의 요구사항 분석)

  • Byeong-Seok Choi;Hyeun-Sool Hong;Sung-Kook Han
    • Journal of the Korea Computer Industry Society
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    • v.4 no.10
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    • pp.655-672
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    • 2003
  • Web services promise a new level of service on top of current web. However, in order to employ their full potential, appropriate descriptions means for web services need to be developed. Recent efforts to describe web service composition lack important features needed to enable a real automated and declarative combination of services. In this paper a set of requirements for effective Semantic Web Service composition are presented, aiming to clarify the state of the art in the area and at providing guidelines to define next steps to be accomplished. We will provide an analysis of BEPEL4WS, DAML-S and WSMF, the most important initiatives in this direction, based on these requirements, describing to what extent current efforts have developed the potential of Semantic Web Service composition.

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QoS-Based and Network-Aware Web Service Composition across Cloud Datacenters

  • Wang, Dandan;Yang, Yang;Mi, Zhenqiang
    • KSII Transactions on Internet and Information Systems (TIIS)
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    • v.9 no.3
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    • pp.971-989
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    • 2015
  • With the development of cloud computing, more and more Web services are deployed on geo-distributed datacenters and are offered to cloud users all over the world. Through service composition technologies, these independent fine-grain services can be integrated to value-added coarse-grain services. During the composition, a number of Web services may provide the same function but differ in performance. In addition, the distribution of cloud datacenters presents a geographically dispersive manner, which elevates the impact of the network on the QoS of composite services. So it is important to select an optimal composition path in terms of QoS when many functionally equivalent services are available. To achieve this objective, we first present a graph model that takes both QoS of Web services and QoS of network into consideration. Then, a novel approach aiming at selecting the optimal composition path that fulfills the user's end-to-end QoS requirements is provided. We evaluate our approach through simulation and compare our method with existing solutions. Results show that our approach significantly outperforms existing solutions in terms of optimality and scalability.

A study on service composition for web caching on active network (액티브네트워크상의 웹 캐싱을 위한 서비스 컴포지션에 관한 연구)

  • 홍성준;이용수
    • Journal of the Korea Society of Computer and Information
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    • v.8 no.2
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    • pp.129-134
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    • 2003
  • This paper describes an application level composition mechanism called Generic Modeling Environment(GME) for web caching on an Application Level Active Network(ALAN). Web caching on an ALAN requires the application level composition mechanism and a service composition to support adaptability for self-organization. ALAN was developed to solve the problems of the network level Active Network(AN) ALAN has the features of both AN as well as mobile agents. The efficient composition mechanism for the existing AN Projects has been supported primarily for the network level AN. Conversely, ALAN lacks support for the application level AN The existing web caching technology is inter-connected in a manually configured hierarchical tree. Since a self-organization system is intended to be adaptive, web caching for self-organization does not involve a manual configuration or any low-level tuning of the individual nodes of the entire system but requires service composition to support adapting intelligence and fault-tolerance to enable self-organization.

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Ontology-based Service Description and Overloading Method for Ubiquitous Computing (유비쿼터스 컴퓨팅을 위한 온톨로지 기반의 서비스 기술 및 오버로딩 기법)

  • Lee, Mee-Yeon;Lee, Jung-Won;Park, Seung-Soo;Cho, We-Duke
    • The KIPS Transactions:PartB
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    • v.15B no.5
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    • pp.465-476
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    • 2008
  • To provide autonomous and dynamic services for users in a ubiquitous environment where heterogeneity, mobility and variability are main characteristics, an efficient service description/structuring mechanism and a service composition method are essential. Service composition can consider context in real-time and compose appropriate services. In this research, we propose a mechanism for extracting services from a specific domain and structuring them into hierarchical service ontology. Each service is described using the proposed service specification. Based on this service ontology, users can represent their goals using various abstraction levels of services, and then our service overloading method enables to invoke the most appropriate service at the execution time. Moreover, we present a method which can discovery an alternative service by referencing the service ontology, when the requested service is not available. The experimental result shows that our service ontology could improve the success probability of users' goals and reduce service binding time compare to using just an unstructured list of services.

Dynamic Service Composition and Development Using Heterogeneous IoT Systems

  • Ryu, Minwoo;Yun, Jaeseok
    • Journal of the Korea Society of Computer and Information
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    • v.22 no.9
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    • pp.91-97
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    • 2017
  • IoT (Internet of Things) systems are based on heterogeneous hardware systems of different types of devices interconnected each other, ranging from miniaturized and low-power wireless sensor node to cloud servers. These IoT systems composed of heterogeneous hardware utilize data sets collected from a particular set of sensors or control designated actuators when needed using open APIs created through abstraction of devices' resources associated to service applications. However, previously existing IoT services have been usually developed based on vertical platforms, whose sharing and exchange of data is limited within each industry domain, for example, healthcare. Such problem is called 'data silo', and considered one of crucial issues to be solved for the success of establishing IoT ecosystems. Also, IoT services may need to dynamically organize their services according to the change of status of connected devices due to their mobility and dynamic network connectivity. We propose a way of dynamically composing IoT services under the concept of WoT (Web of Things) where heterogeneous devices across different industries are fully integrated into the Web. Our approach allows developers to create IoT services or mash them up in an efficient way using Web objects registered into multiple standardized horizontal IoT platforms where their resources are discoverable and accessible. A Web-based service composition tool is developed to evaluate the practical feasibility of our approach under real-world service development.

Developing XForms Based Mobile User Interface for Web Service Composition (서비스 조합을 위한 XForms 기반의 모바일 사용자 인터페이스 개발)

  • Lee, Eun-Jung
    • The KIPS Transactions:PartD
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    • v.15D no.6
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    • pp.879-888
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    • 2008
  • As web services have become an important architecture solution, web service composition applications are developed actively. A mobile application supporting multiple services requires a complex user interface so that the interface needs to consist of more than one view and to provide a way to navigate between views. In this paper, we presented a formal way to analyze a set of views for a given service specification, and a relation model between views and methods. We then provided an algorithm to generate codes for service method calls and navigation between views. Therefore, with an optional user configuration input, we could automatically generated XForms codes from the web service specifications. Finally, we developed a proof of concept implementation of XForms browser to show that the generated codes works well as an interface for web service compositions.

Automatic Web Services Composition System using Web Services Choreography (웹 서비스 코레오그라피를 이용한 자동 웹 서비스 컴포지션 시스템)

  • Lee, Sang-Kyu;Han, Sang-Yong
    • The KIPS Transactions:PartD
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    • v.15D no.1
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    • pp.113-120
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    • 2008
  • Web Services composition has gained a considerable attention because of the widespread use of the Web Services and SOA. Recently, various researches on automatic Web Services composition are on going to realize more dynamic and intelligent SOA environments. However, there is no complete solution for automatic Web Services composition now and previous researches have several problems. Automatic composition based on syntactic information has low correctness through incorrect semantic linking. Moreover, many researches make an process as the result of composition which is hard for actual execution. In this paper, improved automatic Web Services composition based on Web Services choreography is proposed. In this system, the correctness is improved and the result of composition is more concrete process.

A Basic Study on the Floor Planning of the Expressway Service Facilities - Focused on Busan-Gwangju Expressway - (고속도로 휴게소 시설의 평면계획에 관한 기초적 연구 - 부산~광주 간 고속도로를 중심으로 -)

  • Yang, Kum Suek
    • Journal of the Korean Institute of Rural Architecture
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    • v.6 no.3
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    • pp.39-48
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    • 2004
  • The purpose of this study is to clarify the actual conditions of the plan composition of expressway service facilities. This study investigated the characteristics of both indoor space and outdoor space of 15 service facilities, and then analyzed attributes of users by the plan type along with their perception on the facility usage. The results of this study are summarized as follows; 1) When analyzing the attributes of expressway service facilities users, 36% respondents said that they used the expressway service facilities just to rest. The average distance of using the service plaza was found to be approximately 67km. 2) In terms of the indoor space of the expressway service facilities, as basic patterns, B(R+C+T)-type(53%), A(C+R+T)-type(40%), C(C+T+R)-type(7%) were found in order, all the service facilities need to expand them.

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Service Composition with Data Mining in Ubiquitous Computing Environment (유비쿼터스 컴퓨팅 환경에서 데이터 마이닝을 이용한 서비스 조합)

  • Lee Sun-Young;Lee Jong-Yun
    • The KIPS Transactions:PartD
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    • v.13D no.4 s.107
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    • pp.491-500
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    • 2006
  • Since users want to have services correctly in their own position and surrounding circumstance in ubiquitous computing environment, it is very important to search, compose basic services and provide suitable services according to various circumstances. However existing techniques have been studied on service discovery mainly and lack consideration for position or preference of users. Furthermore, on service composition, they lists basic services simply and do not propose concretely method of use service history data for service composition. Therefore we propose a framework for context-based service provisioning middleware system, called COSEP, and Ontology engine with data ming. This research discovers services by reacting dynamically to circumstance information such as time and position of user, composites services using Ontology engine with data ming and offers newly created optimal services to users.