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352
Marker tracking and HMD calibration for a video-based augmented reality conferencing system
- in The 2nd International Workshop on Augmented Reality (IWAR 99
, 1999
"... We describe an augmented reality conferencing system which uses the overlay of virtual images on the real world. Remote collaborators are represented on Virtual Monitors which can be freely positioned about a user in space. Users can collaboratively view and interact with virtual objects using a sha ..."
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Cited by 514 (26 self)
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We describe an augmented reality conferencing system which uses the overlay of virtual images on the real world. Remote collaborators are represented on Virtual Monitors which can be freely positioned about a user in space. Users can collaboratively view and interact with virtual objects using a shared virtual whiteboard. This is possible through precise virtual image registration using fast and accurate computer vision techniques and HMD calibration. We propose a method for tracking fiducial markers and a calibration method for optical see-through HMD based on the marker tracking. 1.
Concurrency Control in Groupware Systems
- ACM SIGMOD Record
, 1989
"... Abstract. Groupware systems are computer-based systems that support two or more users engaged in a common task, and that provide an interface to a shared environment. These systems frequently require fine-granularity sharing of data and fast response times. This paper distinguishes real-time groupwa ..."
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Cited by 379 (0 self)
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Abstract. Groupware systems are computer-based systems that support two or more users engaged in a common task, and that provide an interface to a shared environment. These systems frequently require fine-granularity sharing of data and fast response times. This paper distinguishes real-time groupware systems from other multi-user systems and dis-cusses their concurrency control requirements. An algorithm for concurrency control in real-time groupware systems is then presented. The advantages of this algorithm are its sim-plicity of use and its responsiveness: users can operate di-rectly on the data without obtaining locks. The algorithm must know some semantics of the operations. However the algorithm’s overall structure is independent of the semantic information, allowing the algorithm to be adapted to many situations. An example application of the algorithm to group text editing is given, along with a sketch of its proof of cor-rectness in this particular case. We note that the behavior desired in many of these systems is non-serializable. 1.
Collaboration and Control: Crisis Management and Multimedia Technology in London Underground Line Control Rooms
- Computer Supported Cooperative Work
, 1992
"... Despite technical advances over the past few years in the area of systems support for cooperative work there is still relatively little understanding of the organisation of collaborative activity in real world, technologically supported, work environments. Indeed, it has been suggested that the fail ..."
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Cited by 255 (2 self)
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Despite technical advances over the past few years in the area of systems support for cooperative work there is still relatively little understanding of the organisation of collaborative activity in real world, technologically supported, work environments. Indeed, it has been suggested that the failure of various technological applications may derive from their relative insensitivity to ordinary work practice and situated conduct. In this paper we discuss the possibility of utilising recent developments within sociology, in particular the naturalistic analysis of organisational conduct and social interaction, as a basis for the design and development of tools and technologies to support collaborative work. Focussing on the Line Control Rooms in London Underground, a complex multimedia environment in transition, we begin to explicate the tacit work practices and procedures whereby personnel systematically communicate information to each other and coordinate a disparate collection of tasks and activities. The design implications of these empirical observations, both for Line Control Room and technologies to support cooperative work, are briefly discussed.
Toward a theory of knowledge reuse: Types of knowledge reuse situations and factors in reuse success
- Journal of Management Information Systems
, 2001
"... This paper represents a step toward a theory of knowledge reusability, with emphasis on knowledge ma nagement systems and repositories, often called organizational memory systems. Synthesis of evidence from a wide variety of sources suggests four distinct types of knowledge reuse situations accordin ..."
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Cited by 179 (1 self)
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This paper represents a step toward a theory of knowledge reusability, with emphasis on knowledge ma nagement systems and repositories, often called organizational memory systems. Synthesis of evidence from a wide variety of sources suggests four distinct types of knowledge reuse situations according to the knowledge reuser and the purpose of knowledge reuse. The types involve shared work producers, who produce knowledge they later reuse, shared work practitioners, who reuse each other’s knowledge contributions, expertise-seeking novices, and secondary knowledge miners. Each type of knowledge reuser has different requirements for knowledge repositories. Owing to how repositories are created, reusers ’ requirements often remain unmet. Repositories often require considerable rework to be useful for new reusers, but knowledge producers rarely have the resources and incentives to do a good job of repurposing knowledge. Solutions include careful use of incentives and human and technical intermediaries.
Collaborative activity and technological design: Task coordination in London Underground control rooms
- In
, 1991
"... Despite technical advances in CSCW over the past few years we still have relatively little understanding of the organisation of collaborative activity in real world. technologically supported, work environments. Indeed, it has been suggested that the failure of various technological applications may ..."
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Cited by 170 (3 self)
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Despite technical advances in CSCW over the past few years we still have relatively little understanding of the organisation of collaborative activity in real world. technologically supported, work environments. Indeed, it has been suggested that the failure of various technological applications may derive from its relative insensitivity to ordinary work practice and situated conduct. In this paper we discuss the possibility of utilising recent developments within social science, and in particular the naturalistic analysis of organisational conduct and interpersonal communication, as a basis for the design and development of tools and technologies to support collaborative work. Focussing on the Line Control Rooms on London Underground, a complex multimedia environment in transition, we begin to explicate the informal work practices and procedures whereby personnel systematically communicate information and coordinate a disparate collection of tasks and activities. These empirical investigations form the foundation to the design of new tools to support collaborative work in Line Control Rooms; technologies which will be sensitive to the ordinary conduct and practical skills of organisational personnel in the London Underground.
CSCW: Four Characters in Search of a Context
, 1989
"... The title of this paper was chosen to highlight the fact that the label CSCW, although widely adopted as the acronym for the field of Computer Supported Cooperative Work, has been applied to computer applications of very different ilk. It is not at all clear what are the unique identifying elements ..."
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Cited by 147 (8 self)
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The title of this paper was chosen to highlight the fact that the label CSCW, although widely adopted as the acronym for the field of Computer Supported Cooperative Work, has been applied to computer applications of very different ilk. It is not at all clear what are the unique identifying elements of this research area. This paper provides a framework for approaching the issue of cooperative work and its possible computer support. The core issues are identified and prospects for the field are outlined.
Value Sensitive Design and Information Systems
- Human-Computer Interaction and Management Information Systems: Foundations. M.E. Sharpe
, 2006
"... Value Sensitive Design is a theoretically grounded approach to the design of technology that accounts for human values in a principled and comprehensive manner throughout the design process. It employs an integrative and iterative tripartite methodology, consisting of conceptual, empirical, and tech ..."
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Cited by 102 (16 self)
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Value Sensitive Design is a theoretically grounded approach to the design of technology that accounts for human values in a principled and comprehensive manner throughout the design process. It employs an integrative and iterative tripartite methodology, consisting of conceptual, empirical, and technical investigations. We explicate Value Sensitive Design by drawing on three case studies. The first study concerns information and control of web browser cookies, implicating the value of informed consent. The second study concerns using high-definition plasma displays in an office environment to provide a “window ” to the outside world, implicating the values of physical and psychological well-being and privacy in public spaces. The third study concerns an integrated land use, transportation, and environmental simulation system to support public deliberation and debate on major land use and transportation decisions, implicating the values of fairness, accountability, and support for the democratic process, as well as a highly diverse range of values that might be held by different stakeholders, such as environmental sustainability, opportunities for business expansion, or walkable neighborhoods. We conclude with direct and practical suggestions for how to engage in Value
What are Workplace Studies for?
, 1995
"... We have considered the role of workplace studies from the CSCW literature which are intended to inform system design and implementation. We present a critique of these studies, categorised according to which phase of the design process they most inform, and discuss the tensions between providing ex ..."
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Cited by 83 (3 self)
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We have considered the role of workplace studies from the CSCW literature which are intended to inform system design and implementation. We present a critique of these studies, categorised according to which phase of the design process they most inform, and discuss the tensions between providing explanatory accounts and usable design recommendations, the pressures on fieldworkers to provide both, the purposes different approaches serve, and the transition from fieldwork to system design.
Let's stop pushing the envelope and start addressing it: a Reference Task Agenda for HCI
, 2000
"... We identify a problem with the process of research in the HCI community -- an overemphasis on "radical invention" at the price of achieving a common research focus. Without such a focus, it is difficult to build on previous work, to compare different interaction techniques objectively, and ..."
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Cited by 73 (4 self)
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We identify a problem with the process of research in the HCI community -- an overemphasis on "radical invention" at the price of achieving a common research focus. Without such a focus, it is difficult to build on previous work, to compare different interaction techniques objectively, and to make progress in developing theory. These problems at the research level have implications for practice, too; as
