Chi-Tai Dang | University of Augsburg (original) (raw)

Papers by Chi-Tai Dang

Research paper thumbnail of Interaction via tangibles and virtuals in a tabletop application

In this paper we report on preliminary results of assets and drawbacks of tangibles compared to ... more In this paper we report on preliminary results of
assets and drawbacks of tangibles compared to virtual objects.
These results were gained by transferring a traditional non-computer-based tabletop game
to a simplified computer-based version.
The design process was guided by interviews with professional tabletop gamers.
In particular, these interviews provided useful insights
regarding the use of tangibles versus virtuals.

Research paper thumbnail of Model-Driven Development of Adaptive Applications with Self-Adaptive Mobile Processes

Writing adaptive applications is complex and thus errorprone. Our self-adaptive migratable Web se... more Writing adaptive applications is complex and thus errorprone. Our self-adaptive migratable Web services (SAM-WS s) already provide adaptation support in terms of location, available state, provided functionality and implementation in use. Yet, SAM-WS s still require developers implementing the adaptation logic themselves.

Research paper thumbnail of Natural interaction with culturally adaptive virtual characters

Journal on Multimodal …, Jan 1, 2012

Research paper thumbnail of Surface-poker: multimodality in tabletop games

… Conference on Interactive Tabletops and Surfaces, Jan 1, 2010

Multimodal interaction and face-to-face communication between players are aspects of traditional ... more Multimodal interaction and face-to-face communication between players are aspects of traditional board games which contribute to their popularity. Such aspects are also typical of digital tabletop games. But in addition to that, digital systems allow for a higher level of multimodality through utilizing novel interaction devices or physiological input data. In this paper, we describe a multimodal tabletop Poker game which makes use of both: additional interaction devices and physiological input data. We outline the tabletop game, the interaction modalities involved, and observations of players.

Research paper thumbnail of Proxy-based Security for the Session Initiation Protocol (SIP)

Systems and Networks …, Jan 1, 2007

There is a trend towards voice-over-IP systems based on the Session Initiation Protocol (SIP), wh... more There is a trend towards voice-over-IP systems based on the Session Initiation Protocol (SIP), which is a protocol for session management in general. However, as signalling data is transferred using the Internet, systems face security problems. Thus, at least authentication of the participants and confidentiality of signalling data have to be ensured as basic mechanism. In this work, we propose a mechanism for assuring the identity of a group of users fulfilling the same role (e.g., employees of a customer call centre). Using our concept enables using only one certificate for the whole group for signing and encrypting messages according to the SIP standard. Our mechanism works transparently for users as we provide a special proxy server for this purpose, which significantly reduces administration efforts and resource needs on the participating nodes. Furthermore, such a proxy server can be used for transparently validating and decrypting SIP messages as well. This reduces efforts on the terminals, resulting in an improved resource-usage, e.g., on a Personal Digital Assistant. We provide an implementation of the concept based on the NIST SIP proxy server.

Research paper thumbnail of Hand distinction for multi-touch tabletop interaction

… of the ACM International Conference on …, Jan 1, 2009

Recent multi-touch multi-user tabletop systems offer rich touch contact properties to application... more Recent multi-touch multi-user tabletop systems offer rich touch contact properties to applications. Not only they provide touch positions, but also finger orientations. Applications can use these properties separated for each finger or derive information by combining the given touch contact data. In this paper, we present an approach to map fingers to their associated joined hand contributing to potential enhancements for gesture recognition and user interaction. For instance, a gesture can be composed of multiple fingers of one hand or different hands. Therefore, we present a simple heuristic for mapping fingers to hands that makes use of constraints applied to the touch position combined with the finger orientation. We tested our approach with collected diverse touch contact data and analyze the results.

Research paper thumbnail of Interaction via tangibles and virtuals in a tabletop application

In this paper we report on preliminary results of assets and drawbacks of tangibles compared to ... more In this paper we report on preliminary results of
assets and drawbacks of tangibles compared to virtual objects.
These results were gained by transferring a traditional non-computer-based tabletop game
to a simplified computer-based version.
The design process was guided by interviews with professional tabletop gamers.
In particular, these interviews provided useful insights
regarding the use of tangibles versus virtuals.

Research paper thumbnail of Model-Driven Development of Adaptive Applications with Self-Adaptive Mobile Processes

Writing adaptive applications is complex and thus errorprone. Our self-adaptive migratable Web se... more Writing adaptive applications is complex and thus errorprone. Our self-adaptive migratable Web services (SAM-WS s) already provide adaptation support in terms of location, available state, provided functionality and implementation in use. Yet, SAM-WS s still require developers implementing the adaptation logic themselves.

Research paper thumbnail of Natural interaction with culturally adaptive virtual characters

Journal on Multimodal …, Jan 1, 2012

Research paper thumbnail of Surface-poker: multimodality in tabletop games

… Conference on Interactive Tabletops and Surfaces, Jan 1, 2010

Multimodal interaction and face-to-face communication between players are aspects of traditional ... more Multimodal interaction and face-to-face communication between players are aspects of traditional board games which contribute to their popularity. Such aspects are also typical of digital tabletop games. But in addition to that, digital systems allow for a higher level of multimodality through utilizing novel interaction devices or physiological input data. In this paper, we describe a multimodal tabletop Poker game which makes use of both: additional interaction devices and physiological input data. We outline the tabletop game, the interaction modalities involved, and observations of players.

Research paper thumbnail of Proxy-based Security for the Session Initiation Protocol (SIP)

Systems and Networks …, Jan 1, 2007

There is a trend towards voice-over-IP systems based on the Session Initiation Protocol (SIP), wh... more There is a trend towards voice-over-IP systems based on the Session Initiation Protocol (SIP), which is a protocol for session management in general. However, as signalling data is transferred using the Internet, systems face security problems. Thus, at least authentication of the participants and confidentiality of signalling data have to be ensured as basic mechanism. In this work, we propose a mechanism for assuring the identity of a group of users fulfilling the same role (e.g., employees of a customer call centre). Using our concept enables using only one certificate for the whole group for signing and encrypting messages according to the SIP standard. Our mechanism works transparently for users as we provide a special proxy server for this purpose, which significantly reduces administration efforts and resource needs on the participating nodes. Furthermore, such a proxy server can be used for transparently validating and decrypting SIP messages as well. This reduces efforts on the terminals, resulting in an improved resource-usage, e.g., on a Personal Digital Assistant. We provide an implementation of the concept based on the NIST SIP proxy server.

Research paper thumbnail of Hand distinction for multi-touch tabletop interaction

… of the ACM International Conference on …, Jan 1, 2009

Recent multi-touch multi-user tabletop systems offer rich touch contact properties to application... more Recent multi-touch multi-user tabletop systems offer rich touch contact properties to applications. Not only they provide touch positions, but also finger orientations. Applications can use these properties separated for each finger or derive information by combining the given touch contact data. In this paper, we present an approach to map fingers to their associated joined hand contributing to potential enhancements for gesture recognition and user interaction. For instance, a gesture can be composed of multiple fingers of one hand or different hands. Therefore, we present a simple heuristic for mapping fingers to hands that makes use of constraints applied to the touch position combined with the finger orientation. We tested our approach with collected diverse touch contact data and analyze the results.