Advanced Topics in Database Research, Vol. 2最新文献

{"title":"Applying UML For Designing Multidimensional Databases And OLAP Applications","authors":"J. Trujillo, S. Luján-Mora, I. Song","doi":"10.4018/978-1-59140-063-9.CH002","DOIUrl":"https://doi.org/10.4018/978-1-59140-063-9.CH002","url":null,"abstract":"Multidimensional (MD) modeling is the basis for Data warehouses (DW), multidimensional databases (MDB), and On-Line Analytical Processing (OLAP) applications. In this chapter, we present how the Unified Modeling Language (UML) can be successfully used to represent both structural and dynamic properties of these systems at the conceptual level. The structure of the system is specified by means of a UML class diagram that considers the main properties of MD modeling with minimal use of constraints and extensions of the UML. If the system to be modeled is too complex, thereby leading us to a considerable number of classes and relationships, we sketch out how to use the package grouping mechanism provided by the UML to 701 E. Chocolate Avenue, Hershey PA 17033-1240, USA Tel: 717/533-8845; Fax 717/533-8661; URL-http://www.idea-group.com IDEA GROUP PUBLISHING This chapter appears in the book, Advanced Topics in Database Research, edited by Keng Siau. Copyright © 2003, Idea Group Inc. Copying or distributing in print or electronic forms without written permission of Idea Group Inc. is prohibited. 14 Trujillo, Lujan-Mora and Song Copyright © 2003, Idea Group Inc. Copying or distributing in print or electronic forms without written permission of Idea Group Inc. is prohibited. INTRODUCTION It is widely accepted that DW, MDB, and OLAP applications are based on multidimensional modeling. The benefit of using this MD modeling is two-fold. On one hand, the MD model is close to data analyzers’ way of thinking; therefore, it helps users understand data. On the other hand, the MD model supports performance improvement, as its simple structure allows us to predict final users’ intentions. Some approaches have been proposed lately (presented in Section 3) to accomplish the conceptual design of these systems. Unfortunately, none of them have been accepted as a standard for DW conceptual modeling. These proposals try to represent main MD properties at the conceptual level with special emphasis on MD data structures. A conceptual modeling approach for DW, however, should also concern other relevant aspects such as initial user requirements, the behavior of the system (e.g., main operations to be accomplished on MD data structures), available data sources, specific issues for automatic generation of the database schema, and so on. We claim that object orientation with the UML provides an adequate notation for modeling every aspect of a DW system (MD data structures, the behavior of the system, etc.) from user requirements to implementation. In this chapter, we present an object-oriented (OO) approach to accomplish the conceptual modeling of DW, MDB and OLAP applications. Our approach introduces a set of minimal constraints and extensions of the UML (Booch, 1998; OMG, 2001) needed for an adequate representation of MD modeling properties. These extensions are based on the standard mechanisms provided by the UML to adapt to a specific method or model (e.g., constraints, t","PeriodicalId":332833,"journal":{"name":"Advanced Topics in Database Research, Vol. 2","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129266774","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A Review of Experiments on Natural Language Interfaces","authors":"H. Chan, John Lim","doi":"10.4018/978-1-59140-063-9.CH004","DOIUrl":"https://doi.org/10.4018/978-1-59140-063-9.CH004","url":null,"abstract":"This chapter provides a review, using both qualitative and quantitative approaches, of experimental studies on natural language interfaces. As data utilization is an important aspect of information systems, numerous experimental studies have been conducted on user performance involving database-related tasks with various database models and/or languages. We propose a two-dimensional conceptual framework aimed at classifying and systematically analyzing these studies, in order to provide a bigger picture facilitating systematic understanding of this body of research. The classification exercise shows that studies involving natural language interfaces did not have very consistent findings. Correspondingly, we applied the meta-analytic technique to attempt to gain insight into these differences. 701 E. Chocolate Avenue, Hershey PA 17033-1240, USA Tel: 717/533-8845; Fax 717/533-8661; URL-http://www.idea-group.com IDE GROUP PUBLISHING This chapter appears in the book, Advanced Topics in Database Research, edited by Keng Siau. Copyright © 2003, Idea Group Inc. Copying or distributing in print or electronic forms without written permission of Idea Group Inc. is prohibited.","PeriodicalId":332833,"journal":{"name":"Advanced Topics in Database Research, Vol. 2","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127720572","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Towards Flexible Specification, Composition, and Coordination of Workflow Activities","authors":"Ling Liu, C. Pu","doi":"10.4018/978-1-59140-063-9.CH008","DOIUrl":"https://doi.org/10.4018/978-1-59140-063-9.CH008","url":null,"abstract":"We introduce the ActivityFlow specification language for flexible specification, composition, and coordination of workflow activities. The most interesting features of the ActivityFlow specification language include (1) a collection of specification mechanisms allowing workflow designers to use a uniform workflow specification interface to describe different types (i.e., ad-hoc, administrative, or production) of workflows involved in their organizational processes (an objective of this feature is to help increase the flexibility of workflow processes in accommodating changes); (2) a set of activity modeling facilities, enabling workflow designers to describe the flow of work declaratively and incrementally, allowing reasoning about correctness and security of complex workflow activities independently from their underlying implementation mechanisms; (3) an open architecture that supports user interaction as well as collaboration of workflow systems of different organizations. 701 E. Chocolate Avenue, Hershey PA 17033-1240, USA Tel: 717/533-8845; Fax 717/533-8661; URL-http://www.idea-group.com IDEA GROUP PUBLISHING This chapter appears in the book, Advanced Topics in Database Research, edited by Keng Siau. Copyright © 2003, Idea Group Inc. Copying or distributing in print or electronic forms without written permission of Idea Group Inc. is prohibited. Specification, Composition, and Coordination of Workflow Activities 163 Copyright © 2003, Idea Group Inc. Copying or distributing in print or electronic forms without written permission of Idea Group Inc. is prohibited. INTRODUCTION The focus of office computing today has shifted from automating individual work activities to supporting the automation of organizational business processes. Examples of such business processes include handling bank loan applications, processing insurance claims, and providing telephone services. Such requirement shift, pushed by the technology trends, has promoted the emergence of a new computing infrastructure, workflow management systems (WFMSs), which provides a model of business processes and a foundation on which to build solutions supporting the coordination, execution, and management of business processes (Hsu & Kleissner, 1996). One of the main challenges in today’s WFMSs is to provide tools to support organizations to coordinate and automate the flow of work activities between people and groups within an organization, and to streamline and manage business processes that depend on both information systems and human resources. Over the past few years, many workflow management systems have become available on the market, or developed in research labs world wide (Mohan, 1994; Sheth et al., 1996; Georgakopoulos et al., 1995b). Although there are more and more successes in the workflow research and development, it is widely recognized (Mohan, 1994; Sheth et al., 1996) that there are still technical problems, ranging from inflexible and rigid process specification and e","PeriodicalId":332833,"journal":{"name":"Advanced Topics in Database Research, Vol. 2","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134522461","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Meta-model Based Information Mediation","authors":"Luyin Zhao, K. Siau","doi":"10.4018/978-1-59140-063-9.CH001","DOIUrl":"https://doi.org/10.4018/978-1-59140-063-9.CH001","url":null,"abstract":"INTRODUCTION Information mediation is a research area that deals with integrating information from different, usually heterogeneous, information sources, including regular databases, XML source, record files, email systems, etc. The software that handles or masks data heterogeneity from end users is called a mediator. ABSTRACT Information mediation is one of the major approaches to solve interoperability problems related to heterogeneous information integration. This paper first discusses the concept of information mediation and typical mediation architecture. Two major mediation research projects, TSIMMIS and MIX, and their limitations, are discussed. Meta-model, a way for exchanging metadata, is then introduced for the purpose of improving information mediation. Finally, a meta-model based mediation approach is proposed. 701 E. Chocolate Avenue, Hershey PA 17033-1240, USA Tel: 717/533-8845; Fax 717/533-8661; URL-http://www.idea-group.com IDEA GROUP PUBLISHING","PeriodicalId":332833,"journal":{"name":"Advanced Topics in Database Research, Vol. 2","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128042707","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A Run-Time Based Technique to Optimize Queries in Distributed Internet Databases","authors":"L. Khan, A. Ponnusamy, D. McLeod, C. Shahabi","doi":"10.4018/978-1-59140-063-9.CH007","DOIUrl":"https://doi.org/10.4018/978-1-59140-063-9.CH007","url":null,"abstract":"An adaptive probe-based optimization technique is developed and demonstrated in the context of an Internet-based distributed database environment. More and more common are database systems, which are distributed across servers communicating via the Internet where a query at a given site might require data from remote sites. Optimizing the response time of such queries is a challenging task due to the unpredictability of server 701 E. Chocolate Avenue, Hershey PA 17033-1240, USA Tel: 717/533-8845; Fax 717/533-8661; URL-http://www.idea-group.com IDEA GROUP PUBLISHING This chapter appears in the book, Advanced Topics in Database Research, edited by Keng Siau. Copyright © 2003, Idea Group Inc. Copying or distributing in print or electronic forms without written permission of Idea Group Inc. is prohibited. Queries in Distributed Internet Databases 129 Copyright © 2003, Idea Group Inc. Copying or distributing in print or electronic forms without written permission of Idea Group Inc. is prohibited. performance and network traffic at the time of data shipment; this may result in the selection of an expensive query plan using a static query optimizer. We constructed an experimental setup consisting of two servers running the same DBMS connected via the Internet. Concentrating on join queries, we demonstrate how a static query optimizer might choose an expensive plan by mistake. This is due to the lack of a priori knowledge of the run-time environment, inaccurate statistical assumptions in size estimation, and neglecting the cost of remote method invocation. These shortcomings are addressed collectively by proposing a probing mechanism. Furthermore, we extend our mechanism with an adaptive technique that detects sub-optimality of a plan during query execution and attempts to switch to the cheapest plan while avoiding redundant work and imposing little overhead. We demonstrate that this probe technique can be extended in a client-server environment as a basis for choosing the right place for the execution of user defined functions (UDFs). An implementation of our run-time optimization technique for queries was constructed in the Java language and incorporated into an experimental setup. The results demonstrate the superiority of our probebased optimization over a static optimization. INTRODUCTION A distributed database is a collection of partially independent databases that share a common schema, and coordinates processing of non-local transactions. Processors communicate with one another through a communication network (Silberschatz, Korth, & Sudarshan, 1997; Yu & Meng, 1998). We focus on distributed database systems with sites running homogeneous software (i.e., database management system, DBMS) on heterogeneous hardware (e.g., PC and Unix workstations) connected via the Internet. The Internet databases are appropriate for organizations consisting of a number of almost independent suborganizations, such as a university with many departments or a bank with","PeriodicalId":332833,"journal":{"name":"Advanced Topics in Database Research, Vol. 2","volume":"60 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126287888","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Performance Implication of Knowledge Discovery Techniques in Databases","authors":"B. Rajagopalan, R. Krovi","doi":"10.4018/978-1-59140-063-9.CH009","DOIUrl":"https://doi.org/10.4018/978-1-59140-063-9.CH009","url":null,"abstract":"This chapter introduces knowledge discovery techniques as a means of identifying critical trends and patterns for business decision support. It suggests that effective implementation of these techniques requires a careful assessment of the various data mining tools and algorithms available. Both statistical and machine-learning based algorithms have been widely applied to discover knowledge from data. In this chapter we describe some of these algorithms and investigate their relative performance for classification problems. Simulation based results support the proposition that machinelearning algorithms outperform their statistical counterparts, albeit only under certain conditions. Further, the authors hope that the discussion on performance related issues will foster a better understanding of the application and appropriateness of knowledge discovery techniques. 701 E. Chocolate Avenue, Hershey PA 17033-1240, USA Tel: 717/533-8845; Fax 717/533-8661; URL-http://www.idea-group.com IDEA GROUP PUBLISHING This chapter appears in the book, Advanced Topics in Database Research, edited by Keng Sia . Copyright © 2003, Idea Group Inc. Copying or distributing in print or electronic forms without written permission of Idea Group Inc. is prohibited. 192 Rajagopalan and Krovi Copyright © 2003, Idea Group Inc. Copying or distributing in print or electronic forms without written permission of Idea Group Inc. is prohibited. INTRODUCTION The volume of data collected by businesses today is phenomenal and is increasing exponentially. The challenge is to integrate and correlate data related to both online and offline sales, customer satisfaction surveys, and server log files. To this end, data mining (DM) the process of sifting through the mass of organizational (internal and external) data to identify patterns, is critical for decision support. Effective data mining has several applications, like fraud detection and bankruptcy prediction (Tam & Kiang, 1992; Lee, Han, & Kwon, 1996; Kumar, Krovi, & Rajagopalan, 1997), strategic decision-making (Nazem & Shin, 1999), and database marketing (Brachman, R.J. Khabaza, T. Kloesgen, W. PiatetskyShapiro, G. & Simoudis, E, 1996). Today, businesses have the unique opportunity for using such techniques for target marketing and customer relationship management. Analysis of massive data collected by businesses can support intelligence-gathering efforts about their competition, product, or market. Intelligent tools based on rules derived from web mining can also play an important role in personalization related to site content and presentation. Recently, there has been considerable interest on how to integrate and mine such data (Mulvenna, Anand, & Buchner, 2000; Brachman et al., 1996). Business databases in general pose a unique problem for pattern extraction because of their complex nature. This complexity arises from anomalies such as discontinuity, noise, ambiguity, and incompleteness (Fayyad, Piatetsky-Shapiro & Smyth, 1996).","PeriodicalId":332833,"journal":{"name":"Advanced Topics in Database Research, Vol. 2","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132907532","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"On The Representation Of Temporal Dynamics","authors":"S. March, G. Allen","doi":"10.4018/978-1-59140-063-9.CH003","DOIUrl":"https://doi.org/10.4018/978-1-59140-063-9.CH003","url":null,"abstract":"Research in temporal database management has suggested that the EntityRelationship model must be extended to compensate for its lack of constructs for representing the world’s dynamic nature. This claimed deficiency arises from the mistaken idea that Entity-Relationship diagrams represent only a snapshot of reality. Practitioners have long used Entity-Relationship diagrams without temporal extensions to design systems with rich support for temporality by using entities to represent the events that cause state changes, rather than by defining temporal attributes and relationships to record past states. While both approaches can represent temporality, only the event approach maintains modeling parsimony and represents why a particular state exists. 701 E. Chocolate Avenue, Hershey PA 17033-1240, USA Tel: 717/533-8845; Fax 717/533-8661; URL-http://www.idea-group.com IDEA GR UP PUBLISHING This chapter appears in the b ok, Advanced Topics in Database Research, edited by Keng Siau. Copyright © 2003, Idea Gr up Inc. Copying or distri uting in print or electronic forms without written permission of Idea Group Inc. is prohibited.","PeriodicalId":332833,"journal":{"name":"Advanced Topics in Database Research, Vol. 2","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122705908","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Implementation Techniques For Extensible Object Storage Systems","authors":"Jung-Ho Ahn, Haiyan Song, Hyoung-Joo Kim","doi":"10.4018/978-1-59140-063-9.CH006","DOIUrl":"https://doi.org/10.4018/978-1-59140-063-9.CH006","url":null,"abstract":"An efficient object manager, a middle layer on top of a storage system, is essential to ensure acceptable performance of object-oriented database systems, since a traditional record-based storage system is too simple to provide object abstraction. In this chapter, we design and implement an extensible object storage system, called Soprano, in an object-oriented fashion which has shown great potential in extensibility and code reusability. Soprano provides a uniform object abstraction and gives us the convenience of persistent programming through many useful persistent classes. Also, Soprano supports efficient object management and pointer swizzling for fast object access. 701 E. Chocolate Avenue, Hershey PA 17033-1240, USA Tel: 717/533-8845; Fax 717/533-8661; URL-http://www.idea-group.com IDEA GROUP PUBLISHING This chapter appears in the book, Advanced Topics in Database Research, edited by Keng Siau. Copyright © 2003, Idea Group Inc. Copying or distributing in print or electronic forms without written permission of Idea Group Inc. is prohibited. Implementation Techniques for Extensible Object Storage Systems 105 Copyright © 2003, Idea Group Inc. Copying or distributing in print or electronic forms without written permission of Idea Group Inc. is prohibited. INTRODUCTION In recent years, many object-oriented database systems have been developed and have become widely accepted in the next generation of telecommunications, Internet, and financial applications around the globe. Due to the complexity of data management in such applications, key issues are performance and the requirement for a flexible and transparent object management environment. Thus, the commercial success of the object-oriented database systems largely depends on how well they meet these stringent requirements. Contemporary relational database systems consist of two main modules: a query processor and a storage system. A query processor returns the result of a given query by translating it into a series of internal storage system calls. The lowlevel storage system provides data persistency and transaction management with full control of physical devices. In object-oriented database management systems (OODBMSs), however, it is no longer adequate for upper layers, such as a query processor, to call a low-level storage system directly. This is because the upper layers of an OODBMS should be adapted to the rich and extensible nature of the object-oriented data model directly, while a traditional relational storage system supports only record-oriented data abstraction. That is, upper layers (if built directly on top of the relational storage system) would have to implement object abstraction, resulting in poorer performance due to increased complexity (Bancilhon et al., 1992). To overcome this problem, most OODBMSs employ a middle layer, which is called an object manager, on top of the storage system. The objective of an object manager is to reduce the impedance mismatch between upper","PeriodicalId":332833,"journal":{"name":"Advanced Topics in Database Research, Vol. 2","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121526649","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Software Agents for Mobile Commerce Services Support","authors":"M. Matskin, A. Tveit","doi":"10.4018/978-1-59140-063-9.CH011","DOIUrl":"https://doi.org/10.4018/978-1-59140-063-9.CH011","url":null,"abstract":"This chapter considers an application of software agents to mobile commerce services provision. With the increasing number of e-commerce services for mobile devices, there are challenges in making these services more personalized and in taking into account the severely constrained bandwidth and restricted user interface these devices currently provide. In this chapter we present an agent-based platform for support of mobile commerce using wireless devices. Agents represent mobile device customers in the network by implementing highly personalized customer profiles. The platform allows customization and adaptation of mobile commerce services as well as pro-active processing and notification of important events. Information to the customers is delivered via both an access to the Internet and SMS messages. Usage of the platform is illustrated by examples of valued customer membership services and subscription services support. We hope that the presented work demonstrates benefits of software agents as assistants in mobile commerce services. 701 E. Chocolate Avenue, Hershey PA 17033-1240, USA Tel: 717/533-8845; Fax 717/533-8661; URL-http://www.idea-group.com IDEA GROUP PUBLISHING This chapter appears in the book, Advanced Topics in Database Research, edited by Keng Siau. Copyright © 2003, Idea Group Inc. Copying or distributing in print or electronic forms without written permission of Idea Group Inc. is prohibited. Software Agents for Mobile Commerce Services Support 249 Copyright © 2003, Idea Group Inc. Copying or distributing in print or electronic forms without written permission of Idea Group Inc. is prohibited. INTRODUCTION The increasing number of mobile portable devices in use creates a great opportunity for development of a wide spectrum of mobile e-commerce services. The main advantage of these services is their high availability. Customers with a mobile device can enjoy these e-commerce services regardless of time or location. However, mobile devices, such as cellular phones and PDAs, are constrained by severe restrictions that might complicate practical use of e-commerce services. These restrictions are related to the limitations of wireless data networks when compared to wired networks (less bandwidth, more latency, lower connection stability, less predictability, and less standardized protocols) and to the limitations of mobile handsets when compared to personal computers (small screen size, complicated text input, little memory, slow CPU, and more constrained energy supply). Additional problems with wide application of mobile e-commerce services are related to higher cost of wireless communications (compared with wired communications) and users of mobile devices not having sufficient experience of Internet or PC usage. To overcome the above restrictions and problems, we require simplicity and expressiveness in the mobile commerce services. It is possible that some of the limitations will be relaxed in the future through improved hardwa","PeriodicalId":332833,"journal":{"name":"Advanced Topics in Database Research, Vol. 2","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125162776","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Considering Mobility in Query Processing for Mobile Commerce Systems","authors":"Chih-Horng Ke, Chiang Lee","doi":"10.4018/978-1-59140-063-9.CH013","DOIUrl":"https://doi.org/10.4018/978-1-59140-063-9.CH013","url":null,"abstract":"With the merge of mobile computing and electronic commerce technologies, millions of mobile users in the near future could carry a mobile device requesting services through the electronic commerce applications. While serving such a mobile user, the server should consider how to minimize the response time of the request. This chapter discusses the issue of data processing for mobile commerce systems. Due to the characteristics of a mobile commerce environment such as user’s mobility, the user may not be at the same site as where he/she issued the request when the request’s result is ready to deliver to the user. This chapter argues that conventional strategies for query processing are no longer adequate in a mobile commerce environment and introduces some query processing strategies considering mobility for the mobile commerce systems. All the strategies are presented along with a cost analysis as the theoretical basis. Last, some of outstanding and interesting issues are described. 701 E. Chocolate Avenue, Hershey PA 17033-1240, USA Tel: 717/533-8845; Fax 717/533-8661; URL-http://www.idea-group.com IDEA GROUP PUBLISHING This chapter appears in the book, Advanced Topics in Database Research, edited by Keng Siau. Copyright © 2003, Idea Group Inc. Copying or distributing in print or electronic forms without written permission of Idea Group Inc. is prohibited. Considering Mobility in Query Processing for Mobile Commerce Systems 303 Copyright © 2003, Idea Group Inc. Copying or distributing in print or electronic forms without written permission of Idea Group Inc. is prohibited. INTRODUCTION The rapid growth of the Internet and the widespread popularity of the Web allow companies to overcome many of the physical constraints that often prevent them from doing business in distant markets (Chol & Whinston, 1999). Therefore, more and more applications of electronic commerce are designed to conduct business between enterprises and customers. Additionally, rapid advances of wireless related technology, such as cellular network, satellite communication, and wireless LANs, have brought new opportunities for accessing information without any time or space constraints. In the foreseeable future, tens of millions of users will carry mobile computers (devices) e.g., portable palmtop or laptop computers, to access online information from various data sources at any time and anywhere (Imielinski & Badrinath, 1994). The merging of these two waves is expected to emerge as an appealing new application in the distributed computing field. What Is a Mobile Commerce System? Electronic commerce seems to be a natural and expected extension of the presence of the Web. It has many advantages over conventional commerce such as online shopping, the probability to enable the entire process to occur electronically, the ability to accommodate bidirectional communications between the vendor and the vendee easily, etc. Additionally, it can also record and incorporate customer prefere","PeriodicalId":332833,"journal":{"name":"Advanced Topics in Database Research, Vol. 2","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123804319","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}