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Proceedings. Tenth International Workshop on Database and Expert Systems Applications. DEXA 99最新文献

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Spatiotemporal extensions to Unified Modeling Language 统一建模语言的时空扩展
Proceedings. Tenth International Workshop on Database and Expert Systems Applications. DEXA 99 Pub Date : 1999-09-01 DOI: 10.1109/DEXA.1999.795209
Rosanne J. Price, K. Ramamohanarao, B. Srinivasan
{"title":"Spatiotemporal extensions to Unified Modeling Language","authors":"Rosanne J. Price, K. Ramamohanarao, B. Srinivasan","doi":"10.1109/DEXA.1999.795209","DOIUrl":"https://doi.org/10.1109/DEXA.1999.795209","url":null,"abstract":"Geographic information systems (GIS) and other multimedia applications such as video databases have motivated recent interest in spatiotemporal data modeling. This paper presents a graphical extension to the Unified Modeling Language (UML) which is designed to support requirements analysis and specification for applications having different underlying space/time models and semantics.","PeriodicalId":276867,"journal":{"name":"Proceedings. Tenth International Workshop on Database and Expert Systems Applications. DEXA 99","volume":"17 3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128571821","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}
引用次数: 19
Lightweight objects for QoS management in CORBA CORBA中用于QoS管理的轻量级对象
Proceedings. Tenth International Workshop on Database and Expert Systems Applications. DEXA 99 Pub Date : 1999-09-01 DOI: 10.1109/DEXA.1999.795303
D. Tien, O. Villin, C. Bac
{"title":"Lightweight objects for QoS management in CORBA","authors":"D. Tien, O. Villin, C. Bac","doi":"10.1109/DEXA.1999.795303","DOIUrl":"https://doi.org/10.1109/DEXA.1999.795303","url":null,"abstract":"This paper describes a global scheme for the support of quality of service (QoS) in CORBA environment. The support of QoS is done through the interaction between two CORBA objects, the micro QoS manager and the object resource manager. A key feature of this scheme is the ability to provide an accurate QoS support according to the application type while enabling a high level of maintenance and reusability. The paper outlines the architectural principles used and describes our implementation in a video-on-demand application context.","PeriodicalId":276867,"journal":{"name":"Proceedings. Tenth International Workshop on Database and Expert Systems Applications. DEXA 99","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133435876","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}
引用次数: 4
Guidelines for better scenarios: supporting theories and evidence 更好情景的指导方针:支持理论和证据
Proceedings. Tenth International Workshop on Database and Expert Systems Applications. DEXA 99 Pub Date : 1999-09-01 DOI: 10.1109/DEXA.1999.795192
N. Maiden, G. Rugg, P. Patel
{"title":"Guidelines for better scenarios: supporting theories and evidence","authors":"N. Maiden, G. Rugg, P. Patel","doi":"10.1109/DEXA.1999.795192","DOIUrl":"https://doi.org/10.1109/DEXA.1999.795192","url":null,"abstract":"Today different types of scenario are used to support a diverse range of requirements engineering tasks. However, little is understood about how to design scenarios and their usage sessions to support these different tasks. This paper presents SACRE, a theoretically-grounded framework which supports a requirements engineering team to design and use scenarios. As well as reporting empirical findings which highlight the importance of designing scenarios to fit the task, it describes findings from disciplines such as cognitive science and knowledge engineering which inform scenario design through guidelines. It ends with proposals to better design scenarios.","PeriodicalId":276867,"journal":{"name":"Proceedings. Tenth International Workshop on Database and Expert Systems Applications. DEXA 99","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122241926","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}
引用次数: 4
A data model and algebra for the Web Web的数据模型和代数
Proceedings. Tenth International Workshop on Database and Expert Systems Applications. DEXA 99 Pub Date : 1999-09-01 DOI: 10.1109/DEXA.1999.795271
Dell Zhang, Yisheng Dong
{"title":"A data model and algebra for the Web","authors":"Dell Zhang, Yisheng Dong","doi":"10.1109/DEXA.1999.795271","DOIUrl":"https://doi.org/10.1109/DEXA.1999.795271","url":null,"abstract":"The recent emergence of XML as a standard for representation and exchange of data on the Web has drawn significant attention. But existing semistructured data models, such as OEM, cannot support XML naturally and fully. A new data model named XOM is proposed in this paper as the common data model for the Web data source. Based on rooted connected directed graphs both cyclic and acyclic, whose nodes are labeled and edges are ranked, XOM can describe the aggregation relationship as well as the general reference relationship (linkage) between XML elements. Through ranked closure operation, both tree-oriented and graph-oriented models can be unified in XOM. As the formal foundation for query processing and optimization for Web data, a new algebra called XOM algebra, which includes six operations, i.e., object union, difference, select, project, paste and cut, is also proposed. In comparison with relational algebra, XOM algebra is more flexible and powerful.","PeriodicalId":276867,"journal":{"name":"Proceedings. Tenth International Workshop on Database and Expert Systems Applications. DEXA 99","volume":"48 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124859757","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}
引用次数: 10
A process model for requirements engineering of CCOTS ccts需求工程的过程模型
Proceedings. Tenth International Workshop on Database and Expert Systems Applications. DEXA 99 Pub Date : 1999-09-01 DOI: 10.1109/DEXA.1999.795186
Bernhard Deifel
{"title":"A process model for requirements engineering of CCOTS","authors":"Bernhard Deifel","doi":"10.1109/DEXA.1999.795186","DOIUrl":"https://doi.org/10.1109/DEXA.1999.795186","url":null,"abstract":"In this paper we present a process model for the requirements engineering of complex commercial off the shelf software (CCOTS). It describes a systematic way in which collected requirements can be brought to a concrete version plan for different products within a product system. The described process supports in particular the assessment of importance and uncertainty of possible requirement variations and the impact analysis of necessary requirement changes. Further it enables CCOTS providers to plan future versions in a flexible way.","PeriodicalId":276867,"journal":{"name":"Proceedings. Tenth International Workshop on Database and Expert Systems Applications. DEXA 99","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124832515","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}
引用次数: 17
Using the distance distribution for approximate similarity queries in high-dimensional metric spaces 在高维度量空间中使用距离分布进行近似相似查询
Proceedings. Tenth International Workshop on Database and Expert Systems Applications. DEXA 99 Pub Date : 1999-09-01 DOI: 10.1109/DEXA.1999.795166
P. Ciaccia, M. Patella
{"title":"Using the distance distribution for approximate similarity queries in high-dimensional metric spaces","authors":"P. Ciaccia, M. Patella","doi":"10.1109/DEXA.1999.795166","DOIUrl":"https://doi.org/10.1109/DEXA.1999.795166","url":null,"abstract":"We investigate the problem of approximate similarity (nearest neighbor) search in high-dimensional metric spaces, and describe how the distance distribution of the query object can be exploited so as to provide probabilistic guarantees on the quality of the result. This leads to a new paradigm for similarity search, called PAC-NN (probably approximately correct nearest neighbor) queries, aiming to break the \"dimensionality curse\". PAC-NN queries return, with probability at least 1-/spl delta/, a (1+/spl epsiv/)-approximate NN-an object whose distance from the query q is less than (1+/spl epsiv/) times the distance between q and its NN. Analytical and experimental results obtained for sequential and index-based algorithms show that PAC-NN queries can be efficiently processed even on very high-dimensional spaces and that control can be exerted in order to tradeoff the accuracy of the result and the cost.","PeriodicalId":276867,"journal":{"name":"Proceedings. Tenth International Workshop on Database and Expert Systems Applications. DEXA 99","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130335594","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}
引用次数: 7
Geo-information for monitoring land use from map overlay to object-structured noise reduction 用于监测土地利用的地理信息，从地图覆盖到物体结构降噪
Proceedings. Tenth International Workshop on Database and Expert Systems Applications. DEXA 99 Pub Date : 1999-09-01 DOI: 10.1109/DEXA.1999.795203
C. D. Zeeuw, A. Bregt, M. Sonneveld, J. Brink
{"title":"Geo-information for monitoring land use from map overlay to object-structured noise reduction","authors":"C. D. Zeeuw, A. Bregt, M. Sonneveld, J. Brink","doi":"10.1109/DEXA.1999.795203","DOIUrl":"https://doi.org/10.1109/DEXA.1999.795203","url":null,"abstract":"Over the last 10 years, three different national geographical databases with data on land use and land cover have been developed in the Netherlands, all of which are to be updated at a frequency of once every four years. It was shown by means of a case study in the municipality of Soest that these multi-temporal databases could not be used to monitor changes in actual land use by using a simple GIS overlay technique. Most of the resulting changes were explained by the accuracy of the data sets themselves rather than by the 'real world' changes. An initial step in an object-structured approach has been developed, resulting in improved monitoring outcome for a detail of the Top 10 vector database. The method requires (empirical) threshold values for decision rules on overlap percentage, shape factor and reliability of thematic changes. A considerable part of the noise was filtered out at various levels of detail. The method will be further developed towards a monitoring tool for noise reduction, applicable to various spatio-temporal land use databases and data quality independent.","PeriodicalId":276867,"journal":{"name":"Proceedings. Tenth International Workshop on Database and Expert Systems Applications. DEXA 99","volume":"2008 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128958950","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}
引用次数: 9
System-level infrastructure issues for controlled interactions among autonomous participants in electronic commerce processes 电子商务流程中自主参与者之间受控交互的系统级基础设施问题
Proceedings. Tenth International Workshop on Database and Expert Systems Applications. DEXA 99 Pub Date : 1999-09-01 DOI: 10.1109/DEXA.1999.795255
M. Marazakis, D. Papadakis, C. Nikolaou, Penelope Constanta
{"title":"System-level infrastructure issues for controlled interactions among autonomous participants in electronic commerce processes","authors":"M. Marazakis, D. Papadakis, C. Nikolaou, Penelope Constanta","doi":"10.1109/DEXA.1999.795255","DOIUrl":"https://doi.org/10.1109/DEXA.1999.795255","url":null,"abstract":"Electronic commerce in open large scale distributed environments presents several system level challenges in terms of execution model, infrastructure and management. The autonomy of providers severely restricts the scope of control by authorities other than the owner of each service, and makes the design of the distributed software architecture a challenging undertaking. We present our ongoing work toward the development of a distributed software substrate to support controlled interactions among components that are owned and managed by autonomous authorities. This infrastructure is based on a distributed component model, designed to support the paradigm of service level management for specifying and managing commitments made by independent service providers to their clients on performance related attributes of services.","PeriodicalId":276867,"journal":{"name":"Proceedings. Tenth International Workshop on Database and Expert Systems Applications. DEXA 99","volume":"81 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121192842","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}
引用次数: 0
A secure payment system for electronic commerce 电子商务的安全支付系统
Proceedings. Tenth International Workshop on Database and Expert Systems Applications. DEXA 99 Pub Date : 1999-09-01 DOI: 10.1109/DEXA.1999.795290
I. Mavridis, G. Pangalos, T. Koukouvinos, S. Muftic
{"title":"A secure payment system for electronic commerce","authors":"I. Mavridis, G. Pangalos, T. Koukouvinos, S. Muftic","doi":"10.1109/DEXA.1999.795290","DOIUrl":"https://doi.org/10.1109/DEXA.1999.795290","url":null,"abstract":"Security is an important factor for the wide acceptance of electronic commerce services. Special security mechanisms are needed for the implementation of secure electronic payment systems that permit the integration of electronic transactions. In the framework of the information brokerage system that has been developed by the GAIA project of the European union a number of such mechanisms have been proposed and implemented. As a result, an integrated secure electronic payment system is provided that covers a number of different payment methods preserving maximum security of electronic transactions.","PeriodicalId":276867,"journal":{"name":"Proceedings. Tenth International Workshop on Database and Expert Systems Applications. DEXA 99","volume":"114 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122972779","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}
引用次数: 7
Calling all agents, where are you? 呼叫所有探员，你们在哪里?
Proceedings. Tenth International Workshop on Database and Expert Systems Applications. DEXA 99 Pub Date : 1999-09-01 DOI: 10.1109/DEXA.1999.795259
K. Ong, Christopher Chew, W. Ng, Ee-Peng Lim
{"title":"Calling all agents, where are you?","authors":"K. Ong, Christopher Chew, W. Ng, Ee-Peng Lim","doi":"10.1109/DEXA.1999.795259","DOIUrl":"https://doi.org/10.1109/DEXA.1999.795259","url":null,"abstract":"We believe the next step in the application of agent technology to the Internet is the massive population of the Internet with software agents functioning in a wide range of capacities: information filtering, information brokering, commerce, negotiation, and so on. In such an environment, a means to effectively locate relevant agents for relevant tasks is indispensable. We examine issues in the design and implementation of a 'directory agent' that stores meta-information of other agents. In particular, we present results from our work on building a scalable directory agent for a large scale, distributed agent based e-commerce system (the ABECOS project).","PeriodicalId":276867,"journal":{"name":"Proceedings. Tenth International Workshop on Database and Expert Systems Applications. DEXA 99","volume":"66 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123026113","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}
引用次数: 3
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