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2006 International Conference on Collaborative Computing: Networking, Applications and Worksharing最新文献

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Using distributed consistent branching for efficient reconciliation of mobile workspaces 使用分布式一致分支来高效地协调移动工作区
2006 International Conference on Collaborative Computing: Networking, Applications and Worksharing Pub Date : 2006-11-01 DOI: 10.1109/COLCOM.2006.361837
Felix Hupfeld, M. Gordon
{"title":"Using distributed consistent branching for efficient reconciliation of mobile workspaces","authors":"Felix Hupfeld, M. Gordon","doi":"10.1109/COLCOM.2006.361837","DOIUrl":"https://doi.org/10.1109/COLCOM.2006.361837","url":null,"abstract":"Optimistic replication allows mobile workspaces to remain accessible during interrupted network access, but require consecutive handling of any conflicts. When conflict handling requires manual intervention by the user, the system must not require that conflicts are resolved immediatley after their detection. We present a log-based algorithm for reconciling changes to replicated data that supports deferred manual conflict resolution, while sharing the favorable scalability properties of log-based approaches of small storage and communication overhead. Simulation results validate our design and show that it compares favorably in the relevant metrics with version vector-based designs.","PeriodicalId":315775,"journal":{"name":"2006 International Conference on Collaborative Computing: Networking, Applications and Worksharing","volume":"56 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122560966","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: 6
Managing and Recovering High Data Availability in a DHT under Churn 在DHT中管理和恢复高数据可用性
2006 International Conference on Collaborative Computing: Networking, Applications and Worksharing Pub Date : 2006-11-01 DOI: 10.1109/COLCOM.2006.361874
P. Knezevic, A. Wombacher, T. Risse
{"title":"Managing and Recovering High Data Availability in a DHT under Churn","authors":"P. Knezevic, A. Wombacher, T. Risse","doi":"10.1109/COLCOM.2006.361874","DOIUrl":"https://doi.org/10.1109/COLCOM.2006.361874","url":null,"abstract":"An essential issue in peer-to-peer data management is to keep data highly available all the time. A common idea is to replicate data hoping that at least one replica is available when needed. However, due to churns, the number of created replicas could be not sufficient for guaranteeing the intended data availability. If the number of replicas is computed according to the lowest expected peer availability (a classical case), but the expectation were too high, then the peer availability after a churn could be too low, and the system could not be able to recover the requested data availability. The paper is a continuation of previous work (Knezevic et al., 2006) and presents a replication protocol that delivers a configured data availability guarantee, and is resistant to, or recovers fast from churns. The protocol is based on a distributed hash table (DHT), measurement of peer online probability in the system, and adjustment of the number of replicas accordingly. The evaluation shows that we are able to maintain or recover the requested data availability during or shortly after stronger or weaker churns, and at the same time the storage overhead is close to the theoretical minimum","PeriodicalId":315775,"journal":{"name":"2006 International Conference on Collaborative Computing: Networking, Applications and Worksharing","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129592465","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
Secure Communication and Cooperation via Shared Workspaces 通过共享工作区实现安全通信与合作
2006 International Conference on Collaborative Computing: Networking, Applications and Worksharing Pub Date : 2006-11-01 DOI: 10.1109/COLCOM.2006.361865
W. Appelt, Sanjin Pajo, W. Prinz
{"title":"Secure Communication and Cooperation via Shared Workspaces","authors":"W. Appelt, Sanjin Pajo, W. Prinz","doi":"10.1109/COLCOM.2006.361865","DOIUrl":"https://doi.org/10.1109/COLCOM.2006.361865","url":null,"abstract":"In this paper, we discuss security issues of Web based CSCW systems and describe a conceptual model as well a recent extension to the BSCW Shared Workspace System (Appelt, 1999) that satisfies high security requirements for communication and cooperation in an inter-organizational setting by using encryption technology","PeriodicalId":315775,"journal":{"name":"2006 International Conference on Collaborative Computing: Networking, Applications and Worksharing","volume":"109 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129683220","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
Towards Secure Information Sharing and Management in Grid Environments 网格环境下的安全信息共享与管理
2006 International Conference on Collaborative Computing: Networking, Applications and Worksharing Pub Date : 2006-11-01 DOI: 10.1109/COLCOM.2006.361892
Jing Jin, Gail-Joon Ahn
{"title":"Towards Secure Information Sharing and Management in Grid Environments","authors":"Jing Jin, Gail-Joon Ahn","doi":"10.1109/COLCOM.2006.361892","DOIUrl":"https://doi.org/10.1109/COLCOM.2006.361892","url":null,"abstract":"The introduction of service-oriented paradigm in grid and corresponding Web services standards has recently demanded the evolution of access control solutions to support finegrained authorization requirements and dynamic natures derived from grid environments. In this paper, we present a role-based authorization infrastructure for data sharing and management services in grid. Our infrastructure advocates a dynamic and flexible resource-centric authorization approach with features of distributed role-based access control and systematic delegation of administrative authority. The infrastructure seamlessly integrates the existing XACML-based policy framework and authorization services in the RAMARS framework. We discuss our proof-of-concept prototype system that supports Web services and SAML based authorization assertions. We also describe how the framework can be deployed in being compatible with an open grid service architecture","PeriodicalId":315775,"journal":{"name":"2006 International Conference on Collaborative Computing: Networking, Applications and Worksharing","volume":"120 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132480594","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
ROBAC: Scalable Role and Organization Based Access Control Models 基于可伸缩角色和组织的访问控制模型
2006 International Conference on Collaborative Computing: Networking, Applications and Worksharing Pub Date : 2006-11-01 DOI: 10.1109/COLCOM.2006.361879
Zhixiong Zhang, Xinwen Zhang, R. Sandhu
{"title":"ROBAC: Scalable Role and Organization Based Access Control Models","authors":"Zhixiong Zhang, Xinwen Zhang, R. Sandhu","doi":"10.1109/COLCOM.2006.361879","DOIUrl":"https://doi.org/10.1109/COLCOM.2006.361879","url":null,"abstract":"In RBAC, roles are typically created based on job functions inside an organization. Traditional RBAC does not scale up well for modeling security policies spanning multiple organizations. To solve this problem, a family of extended RBAC models called role and organization based access control (ROBAC) models is proposed and formalized in this paper. Two examples are used to motivate and demonstrate the usefulness of ROBAC. Comparison between ROBAC and other related RBAC models is given. We show that ROBAC can significantly reduce administration complexity for Web and Internet-based applications involving a large number of organizations. Some administrative issues for ROBAC are identified and discussed. Although the theoretical-expressive power of ROBAC is the same as that of RBAC, it is more succinct and intuitive to use ROBAC than to use RBAC when applications involve many organizations","PeriodicalId":315775,"journal":{"name":"2006 International Conference on Collaborative Computing: Networking, Applications and Worksharing","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116205467","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: 30
Operational Security Requirements for Large Collaborative Compute Infrastructures 大型协作计算基础设施的操作安全需求
2006 International Conference on Collaborative Computing: Networking, Applications and Worksharing Pub Date : 2006-11-01 DOI: 10.1109/COLCOM.2006.361884
H. Khurana, J. Basney, Von Welch, R. Campbell
{"title":"Operational Security Requirements for Large Collaborative Compute Infrastructures","authors":"H. Khurana, J. Basney, Von Welch, R. Campbell","doi":"10.1109/COLCOM.2006.361884","DOIUrl":"https://doi.org/10.1109/COLCOM.2006.361884","url":null,"abstract":"Large collaborative infrastructures that span multiple organizations such as those that enable grid computing and scientific experimentation are being deployed and used today. In order to secure these infrastructures a comprehensive requirements study is needed that takes into account the novel risks, threats, and operational issues brought on by the large-scale, distributed nature of these systems. In this paper we argue that gaps in security policies and procedures combined with organizational autonomy are the primary drivers motivating a set of requirements that go beyond those observed today. With three example infrastructures in mind, namely, Teragrid, LHC Grid, and GEM, we explore the novel risks, threats, and operational issues to compose a set of operational security requirements; the satisfaction of which are essential for securing such large collaborative infrastructures","PeriodicalId":315775,"journal":{"name":"2006 International Conference on Collaborative Computing: Networking, Applications and Worksharing","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116771925","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: 2
A Modeling and Analysis Approach for Mobile Information Systems 移动信息系统的建模与分析方法
2006 International Conference on Collaborative Computing: Networking, Applications and Worksharing Pub Date : 2006-11-01 DOI: 10.1109/COLCOM.2006.361853
V. Gruhn, André Köhler
{"title":"A Modeling and Analysis Approach for Mobile Information Systems","authors":"V. Gruhn, André Köhler","doi":"10.1109/COLCOM.2006.361853","DOIUrl":"https://doi.org/10.1109/COLCOM.2006.361853","url":null,"abstract":"This paper introduces a graphical modeling notation based on coloured Petri nets for the performance and cost evaluation of mobile applications. When developing such an application some restrictions due to the low bandwidth of mobile networks need to be considered. The notation can be used to model the workflow of a mobile application with just a small effort. The resulting model can be (automatically) transformed into a coloured Petri net for simulating the communication behaviour depending on typical user interactions. The simulation results are an important basis for improving the applications performance and the occurring costs for using mobile networks","PeriodicalId":315775,"journal":{"name":"2006 International Conference on Collaborative Computing: Networking, Applications and Worksharing","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122034378","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: 2
Using Tasks and Semi-structured Messages to Support Decision Follow Up 使用任务和半结构化消息来支持决策跟进
2006 International Conference on Collaborative Computing: Networking, Applications and Worksharing Pub Date : 2006-11-01 DOI: 10.1109/COLCOM.2006.361866
Carla Valle, W. Prinz, M. Jarke
{"title":"Using Tasks and Semi-structured Messages to Support Decision Follow Up","authors":"Carla Valle, W. Prinz, M. Jarke","doi":"10.1109/COLCOM.2006.361866","DOIUrl":"https://doi.org/10.1109/COLCOM.2006.361866","url":null,"abstract":"This paper describes the design and implementation of a coordination mechanism to support follow up of decisions made in meetings, using task management and semi-structured messages in an integrated way. Two questions lead our research: i) can a set of group support mechanisms, enabling the link between pre-meeting, meeting and post-meeting activities, allow for better coordination of decisions being implemented?; ii) can electronic elements, which belong to daily project scenarios, provide awareness of decision implementation's problems? Our evaluations and conclusions indicate that such elements (ie. tasks and emails) provide means for coordination of decision follow up","PeriodicalId":315775,"journal":{"name":"2006 International Conference on Collaborative Computing: Networking, Applications and Worksharing","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129013361","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: 1
Flexible Definition and Resolution of Conflicts through Multi-level Editing 通过多层次编辑灵活定义和解决冲突
2006 International Conference on Collaborative Computing: Networking, Applications and Worksharing Pub Date : 2006-11-01 DOI: 10.1109/COLCOM.2006.361869
C. Ignat, M. Norrie
{"title":"Flexible Definition and Resolution of Conflicts through Multi-level Editing","authors":"C. Ignat, M. Norrie","doi":"10.1109/COLCOM.2006.361869","DOIUrl":"https://doi.org/10.1109/COLCOM.2006.361869","url":null,"abstract":"Version control systems are widely used to support a group of people working together on a set of documents over a network by merging their changes into the same source repository. The existing versioning systems offer limited support concerning conflict resolution and tracking of user activity. In this paper we propose a multi-level editing approach that keeps the editing operations that refer to an element of a hierarchical document associated with that element. In this way, customisable merging is achieved, where the conflicts can be specified and resolved at different granularity levels","PeriodicalId":315775,"journal":{"name":"2006 International Conference on Collaborative Computing: Networking, Applications and Worksharing","volume":"274 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115972492","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
An Efficient Synchronous Collaborative Editing System Employing Dynamic Locking of Varying Granularity in Generalized Document Trees 基于变粒度动态锁定的高效同步协同编辑系统
2006 International Conference on Collaborative Computing: Networking, Applications and Worksharing Pub Date : 2006-11-01 DOI: 10.1109/COLCOM.2006.361858
J. Preston, S. Prasad
{"title":"An Efficient Synchronous Collaborative Editing System Employing Dynamic Locking of Varying Granularity in Generalized Document Trees","authors":"J. Preston, S. Prasad","doi":"10.1109/COLCOM.2006.361858","DOIUrl":"https://doi.org/10.1109/COLCOM.2006.361858","url":null,"abstract":"The primary goals in a synchronous collaborative editing system (CES) involve ensuring a high level of concurrent access while maintaining the properties of the CCI model. We revisit the idea of applying lock-based concurrency control algorithms to manage access to a shared document; this research overcomes the traditional problem of reduced concurrent access inherent in pessimistic concurrency control by dynamically managing the size of the portion of document locked based upon user demand, scaling up and down the lock granularity to accommodate user write requests. We present algorithms to efficiently maximize concurrent access while utilizing caching techniques to reduce communication costs. We also discuss how OT and other optimistic concurrency control techniques may be incorporated within our approach - leveraging best practices of both techniques. We conclude with an analysis of the communication and computational costs of our approach and compare these costs to costs incurred using OT-based concurrency control","PeriodicalId":315775,"journal":{"name":"2006 International Conference on Collaborative Computing: Networking, Applications and Worksharing","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127532624","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
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