This study aims to explore the relationships among three presences, namely cognitive presence, social presence and teaching presence in a Community of Inquiry (CoI) framework in the context of interdisciplinary project-based learning (IPBL) through the collaborative technology Google Applications. The survey data was collected from 138 students with mixed subject specialism participated in a cultural creativity project. All participants were randomly assigned into one of two groups. The control group used online discussion boards, while the treatment group used the Google Applications as a collaborative technology to support the project learning. The results of the study showed that the students' cognitive presence was positively influenced by the teaching and social presence, which supported the theoretical CoI framework. Moreover, in an IPBL context with the support of the Google Applications, social presence had more predictive power in explaining students' cognitive presence than the support provided by the online discussion boards.
Due to the rapid progress of information technology and the Internet generation of students now on campus, game-based learning (GBL) has become an important issue with regard to education. In addition, in an increasingly competitive work environment, students need to cultivate not only their own abilities, but also the ability to collaborate with colleagues after graduation. However, such collaboration needs to be directed by appropriate guidance in order to demonstrate the expected results, and the rules of the related game guide can be applied to achieve this. Therefore, it is of interest to analyse students' learning processes in a digital game with a collaborative learning environment. In this study, we designed a digital history game providing collaboration opportunities for learners to solve problems. The partial least squares (PLS) approach was applied to analyse the effects of this collaboration on the attitude towards and willingness to use game learning, in order to validate our research model.
This research develops a novel representation scheme for collaborative 3D product development with multiple levels of detail (LODs) based on integration of feature model and 2D meshes. Different features are selectively hidden in the product model from certain collaborators, depending on their individual authorities and actual requirements in collaboration. The feature switch face is used to control display/hiding of each feature. A tree-like data structure is introduced for characterizing the feature hierarchy, 2D mesh, and the relations of each feature to the switch faces and LODs in a product model. Algorithms are also provided for quick generation of the mesh data from the data structure for displaying the 3D model corresponding to any LOD. An agent-based system, which allows multi-user synchronous collaborative 3D assembly over the Internet, is implemented to demonstrate the effectiveness of this work. A real scenario of 3D mold design using the system shows that the proposed LOD concept enhances the security of information sharing and the efficiency of data transmission while ensures the practicality in network-based 3D design collaboration.
INTRODUCTIONThe challenge most enterprises facing today is to assure their core competences and outsource less-skilled activities in order to remain competitive in global competition. This is especially important for the medium and small sized enterprises (SME's), which rely on close collaborations with customers, suppliers, and other partners of its supply chain, to compete with large companies. Collaborative product development (CPD) has thus emerged as an effective business approach in many industry sectors [6]. CPD involves a wide spectrum of product development activities, in which design is one of the most complex tasks. The design process is referred to as collaborative design when a product is designed through the collective and joint efforts of many designers [5]. There have been a number of studies concerning distributed collaborative design. Li et. al [13] performed a survey and discussed current research status in this field. Integration of horizontal and hierarchical collaboration, new feature-based streaming technology, and security/interoperability are identified as future research challenges. Multiple-resolution techniques [11,14] have been identified for years as an effective method to achieve good performance in terms of shape preservation and data transfer. The most common approach is mesh refinement, or simplification, adopted for polygon meshes with various LODs, i.e. near objects are rendered with a higher resolution while distant ones with a lower resolution. Most mesh generation based on this approach have been focused on graphics rendering with less emphasis on LOD of design semantics. On the other hand, there have been studies that deal with compression and de-compression of 3D CAD in B-Rep in distributed environment. Koo and Lee [12] developed a "wrap-around" algorithm for producing multi-resolution representations from a B-Rep model, which is...
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