This paper describes a new paperless Korean learning support system for teachers and students who are preparing for Korean proficiency exams. The proposed system uses a Bluetooth network and learning applications based on the SQLite Database in Android devices. Experimental results show that the proposed system is useful for providing learning materials without network infrastructure.

In this paper, we propose stereo vision based visual odometry with an effective feature sampling technique for untextured outdoor environment. In order to extract feature points in untextured condition, we divide an image into some sections and affect suitable processes for each section. This approach can also prevent concentration of feature points, and the influence with a moving object can be reduced. Robust motion estimation is attained using the framework of 3-point algorithm and RANdom SAmple Consensus (RANSAC). Moreover, the accumulation error is reduced by keyframe adjustment. We present and evaluate experimental results for our system in outdoor environment. Proposed visual odometry system can localize the robot's position within 4% error in untextured outdoor environment.

High mobility and large payload capability are important abilities for wall climbing robots. The authors have proposed a new robot system Anchor Climber that could achieve both of these abilities. This robot system is composed of two or more child units and a parent unit. As child units of Anchor Climber, the authors have developed three types of special wall climbing robots, Adhering Mobile Units (AM Units) Type A, B and C. In this paper, developments of other components of Anchor Climber, configuration of Anchor Climber with these components, basic systematic experiments with configured Anchor Climber, and new type of AM Unit are described. From results of the experiments, it was confirmed that Anchor Climber had both high mobility and large payload capability.

High mobility and large payload capability are important for wall climbing robots. The authors have proposed a new robot system Anchor Climber that could achieve both of these two abilities. This robot system is composed of two or more child units and a parent unit. As child units, wall climbing robots Adhering Mobile Units (AM Units) have been developed by using the technique of internally-balanced magnet (IB Magnet). In this paper, study of IB Magnet to use AM Units effectively, proposal of transformable crawler unit as a driving unit of AM Unit, development of an advanced AM Unit with these new mechanisms, and experiments with the robot to confirm effects of added new mechanisms are described.

High mobility and large payload capability are important abilities for wall climbing robots. Authors have proposed a new robot system can provide both of these abilities, named anchor climber. This robot system is composed of two or more child units and a parent unit. Authors also have proposed special wall climbing robots to use these robots as child units of anchor climber, named adhering mobile units (AM Units). Moreover, authors have already developed AM Unit Type A as first prototype of AM Unit. In this paper, authors describe developments of two new types of AM Units, a new type of cover mechanism, and experiments with these AM Units. For these experiments, authors confirmed these units had abilities to act as child units of anchor climber.

Radio frequency identification systems (RFID systems) are becoming popular in various applications, such as supply chain management, animal husbandry and so on. They are useful to manage not only things but also living things. Privacy, however, must be taken in account when they are used around people since people with RFID tags can easily be tracked and traced. While several solutions have been proposed to solve this problem, they have drawbacks that the back-end servers (or the readers) must exhaustive-search all the registered IDs to identify the RFID tags and/or that database must synchronize with the tags. The former is not desirable when a huge number of RFID tags must be managed, and the latter is not desirable when restoring database from backup (since tags and the database are not synchronous after restoration). In this paper, we propose how to solve these problems without deteriorating the privacy protection ability.