Seiie Jang

Ubi-UCAM: a unified context-aware application model

Context-aware application plays an important role in the ubiquitous computing (ubiComp) environment by providing the user with comprehensive services even without any explicitly triggered command. In this paper, we propose a unified context-aware application model which is an essential part to develop various applications in the ubiquitous computing environment. The proposed model affirms the independence between sensor and application by using a unified context in the form of Who (user identity), What (object identity), Where (location), When (time), Why (user intention/emotion) and How (user gesture), called 5W1H. It also ensures that the application exploits a relatively accurate context to trigger personalized services. To show usefulness of the proposed model, we apply it to the sensors and applications in the ubiHome, a test bed for ubiComp-enabled home applications. According to the experimental results, without loss of generality, we believe it can be extended to various context-aware applications in daily life.

Ontology-based semantic recommendation for context-aware e-learning

Nowadays, e-learning systems are widely used for education and training in universities and companies because of their electronic course content access and virtual classroom participation. However, with the rapid increase of learning content on the Web, it will be time-consuming for learners to find contents they really want to and need to study. Aiming at enhancing the efficiency and effectiveness of learning, we propose an ontology-based approach for semantic content recommendation towards context-aware e-learning. The recommender takes knowledge about the learner (user context), knowledge about content, and knowledge about the domain being learned into consideration. Ontology is utilized to model and represent such kinds of knowledge. The recommendation consists of four steps: semantic relevance calculation, recommendation refining, learning path generation, and recommendation augmentation. As a result, a personalized, complete, and augmented learning program is suggested for the learner.

Enhanced Framework for a Personalized User Interface Based on a Unified Context-Aware Application Model for Virtual Environments

In this letter, we propose a enhanced framework for a Personalized User Interface (PUI). This framework allows users to access and customize virtual objects in virtual environments in the sense of sharing user centric context with virtual objects. The proposed framework is enhanced by integrating a unified context-aware application for virtual environments (vr-UCAM 1.5) into virtual objects in the PUI framework. It allows a virtual object to receive context from both real and virtual environments, to decide responses based on context and if-then rules, and to communicate with other objects individually. To demonstrate the effectiveness of the proposed framework, we applied it to a virtual heritage system. Experimental results show that we enhance the accessibility and the customizability of virtual objects through the PUI. The proposed framework is expected to play an important role in VR applications such as education, entertainment, and storytelling.

cPost-it: Context-Based Information Sharing System

In this paper, we propose cPost-it, which allows users to share various types of media data in public places by exploiting context such as the user’s identity, location, time, intention, and object’s identity. The proposed system consists of three key components, i.e., ‘cPost-it Client’ allowing users to retrieve (augment) digital messages on the real-world objects, ‘cPost-it Object’ augmenting shared digital information, and ‘cPost-it Server’ managing the information. The cPost-it provides location based service (LBS) by retrieving the embedded information from the physical objects. Also, it provides the personalized information by exploiting the user’s identity, location, time, etc. According to the subjective evaluations, the proposed cPost-it framework may play important roles in sharing information for the ubiquitous computing environment.

Framework for Personalized User Interface by Sharing User-Centric Context between Real andVirtual Environments*This research was supported in part by Culture Technology Research Center (CTRC) at GIST, and in part by Korea Institute of Science and Technology (KIST).

In this paper, we propose a framework that provides users with personalized interfaces by sharing user-centric context between real and virtual environments. The proposed framework consists of ubi-UCAM for generating users contexts, NAVER for managing virtual environment, and rv-Interface for linking ubi-UCAM with NAVER. Firstly, personalized interface helps users to concentrate on their tasks of interest by reducing burdensome menu selections according to users context. In addition, user-adaptive contents based on users preferences allow more pleasure personal experiences. Finally, personalized interface with context hand-over mechanism enables users to continuously interact with virtual environments, even if the users move around. According to experimental results, we expect that the proposed framework can play an important role for realizing user-centric VR applications by exploiting personalized interface that adapts to user-centric context.