Hong-Chang Lee

Extending VNC for effective collaboration

VNC (virtual network computing) is a remote access software using RFB (remote frame buffer) protocol. VNC supports access to resources of a remote system through sharing the desktop of the remote system. In this paper, we describe an extension of VNC for effective real-time collaboration through the Internet. For effective collaboration, we provide three kinds of access authorities: administrator, worker, and spectator. The administrator controls access authorities of the users. The workers can access the remote resources provided by the collaboration server, while the spectators can not handle the remote resources, only monitoring the remote desktop of the collaboration server. To support those access authorities, the UltraVNC server and the JavaViewer are extended.

CoPortlet: A WebDAV-based collaborative portlet supporting individualized services

The support systems for collaborations and communications through the Internet are frequently required. In addition, since the individualized service has been accepted as a productive and efficient way to work through the Internet, it is desirable for those support systems to be included as a component of the individualized service. In this paper, we describe the development of CoPortlet for the CoSlide collaborative system. CoPortlet is a portlet which provides various methods to control the resources of each workspace on the CoSlide server. As a component of a portal, CoPortlet supports effective collaboration for the portal users. Users can collaborate through CoPortlet included in each userpsilas own interfaces composed by various portlets for his or her daily working environment.

Jabber Messenger for a WebDAV-based Collaborative System

Jakarta Slide is a WebDAV server developed as one of Apache projects, which supports asynchronous authoring for various contents on the server. Unfortunately, since the WebDAV protocol does not explicitly provide the workspaces for user groups, it is difficult to support complicated collaboration using Jakarta Slide. The CoSlide system is an extension of Jakarta Slide to address this problem, presenting more effective collaborative environment by providing various workspaces for group collaboration. In this paper, we describe the CoJBother Messenger for the CoSlide collaborative system. We developed CoJBother by extending the JBother messenger based on the standard Jabber protocol. To support the users and groups defined on the CoSlide system, we also extended the Jabber protocol. CoJBother shows the information on the CoSlide users and groups in addition to the standard Jabber users and groups. In particular, through CoJBother, the members of a group on CoSlide can initiate group chatting without any administrative overhead.

Extending the Jabber protocol for a WebDAV-based Collaborative System

The CoSlide system is a WebDAV-based collaborative system developed as an extension of Jakarta Slide, providing effective asynchronous collaboration using remote resources and various workspaces for group collaboration. Since CoSlide presents only asynchronous collaborative environment, it is desirable to support synchronous communication tools for more effective collaboration. In this paper, we describe an extension of the Jabber protocol, which is an open, XML-based protocol for real-time, extensible instant messaging. We extended the standard Jabber protocol to support the users and groups defined in the CoSlide system. Also, according to the developed protocol, we extended the Jabberd server.

SlideAdmin: An Administration Tool for Jakarta Slide

Jakarta slide is an open-source content management system from the Jakarta project, which supports the WebDAV protocol and the WebDAV ACL protocol. To access the resources managed by slide, users should be registered to Slide with appropriate access privileges. Unfortunately, as of now, it is very cumbersome and time-consuming to add users to slide, setting up access privileges on the resources for them. So, to support efficient administration of the slide system, it is desirable to provide administration tools which can simplify those administrative activities. As one of such tools, we developed an administration tool for the slide system named SlideAdmin. Using SlideAdmin, the system administrator can add or delete users and roles more efficiently. SlideAdmin is composed of JSP pages for the user interface and Java Servlets performing the related administrative logic.