Jung-Wook Choi

R-LIM: an Affordable Library Search System Based on RFID

With a large volume of materials todays libraries carry, locating the exact position of materials is time-consuming. This is not true just for poorly managed libraries, but also for well maintained libraries. In the former case, the problem is rather serious. Even though a material is somewhere in the library, if we cannot locate the material, the fundamental roles of the library may be challenged. In the latter case, one still needs to go through a tedious shelf searching process to locate the material. In this study we propose an affordable RFID based library management system named R-LIM which eases the process of locating books in the library. In an earlier version of R-LIM, expensive RFID antennas had to be placed on every shelf to acquire location information. In this new version, we replace the antennas with inexpensive tags to make the system more affordable. By associating book-tag IDs with shelf-tag IDs through periodic tag scanning, we can identify the exact location of the book we are searching for. This paper describes the localization algorithm of R-LIM, and explains how it can be integrated with other parts of the system

A Study on the Implementation of RFID-based Autonomous Navigation System for Robotic Cellular Phone(RCP)

Industrial and economical importance of CP(Cellular Phone) is growing rapidly. Combined with IT technology, CP is one of the most attractive technologies of today. However, unless we find a new breakthrough in the technology, its growth may slow down soon. RT(Robot Technology) is considered one of the most promising next generation technologies. Unlike the industrial robot of the past, today`s robots require advanced features, such as soft computing, human-friendly interface, interaction technique, speech recognition object recognition, among many others. In this paper, we present a new technological concept named RCP (Robotic Cellular Phone) which integrates RT and CP in the vision of opening a combined advancement of CP, IT, and RT, RCP consists of 3 sub-modules. They are (RCP Mobility System), , and . The main focus of this paper is on which combines an autonomous navigation system of the RT mobility with CP. Through , we are able to provide CP with robotic functions such as auto-charging and real-world robotic entertainment. Ultimately, CP may become a robotic pet to the human beings. consists of various controllers. Two of the main controllers are trajectory controller and self-localization controller. While the former is responsible for the wheel-based navigation of RCP, the latter provides localization information of the moving RCP With the coordinates acquired from RFID-based self-localization controller, trajectory controller refines RCP`s movement to achieve better navigation. In this paper, a prototype of is presented. We describe overall structure of the system and provide experimental results on the RCP navigation.

CPR localization using the RFID tag-floor

In this paper, we describe our approach to achieve accurate localization using RFID for Cellular Phone Robot (CPR). We solely rely on RFID mechanism and complement coordinate errors accumulated during the wheel-based CPR navigation. We especially focus on how to distribute RFID tags (tag pattern) and how many to place (tag granularity) on the floor to accomplish efficient navigations. We define the error in navigation and use it to compare the effectiveness of various RFID floor settings through a simulation. Identified tag patterns and granularities would be useful to many USN applications where the adoption of RFID technology is appropriate.

Tag-only aging-counter localization for the R-LIM2 system

With the large number of items stored in present-day libraries, locating the exact position of an item is time-consuming. This is true not only for poorly managed libraries, but also for well maintained libraries. In the former case, the problem is rather serious. Even though an item may be somewhere in the library, the fundamental role of the library may not be fulfilled, if a user cannot locate the item. In the latter case, a user still needs to perform a tedious shelf search to locate the item. In the first version of the RFID-based Library Management (R-LIM) system, we attached expensive RFID antennas to every shelf, to acquire localization information about the items. However, the solution was not cost-effective, due to the large number of RFID antennas needed. Therefore, in this study, we propose tag-only aging-counter localization for R-LIM, which does not require shelf antennas to determine book locations. In this more recent version, viz., the R-LIM2 system, we replace expensive antennas with inexpensive RFID tags, which enables us to build an affordable system. By associating RFID tags attached to books with those attached to shelves, via periodic tag scans, we determine the exact location of books. This paper describes the aging-counter localization algorithm developed for R-LIM2, and explains how it can be integrated with other parts of the system to locate a book in a search.

Improved Authentication Scheme Using Facial Recognition Scheme Based on RFID Tag

Recently diverse studies have emerged on the ubiquitous environment including the ones on RFID tag. In terms of security, in particular, RFID tag is not able to provide complex forms of security services due to its hardware limits, putting in turn limits on its wider use. Therefore, this thesis is to suggest an improved RFID tag authentication scheme using face recognition scheme. It divides passive RFID tags and active ones, provides secure device authentication using the hash function based on the passive RFID tag, and offers user authentication using 2D face recognition data, thus providing an improved form of RFID authentication scheme.

A Range-Free Localization Method using an RFID System -Applied to a Library Book Location System-

We propose an RFID system based on range-free localization method. This method recognizes pre-determined reference tags first, and then checks within which reference tag the target tag is placed closest. It estimates target tag`s position relative to the reference tag`s position. We use Aging Counter to estimate the distance between reference and target tags using the read ratio of RFID tags. Practicality of the proposed method is verified by applying it to a library book locating system.

A Study on the Development of Ubiquitous CellPhone Robot

In this video clip, the development of ubiquitous CPR(Cellular Phone Robot), which adds personal robotic features such as mobility and emotion to CP(Cellular Phone), is presented. We described a prototype implementation of CPR and demonstrated its successful navigational ability. CPR movement are controlled by the data acquired from velocity sensors and the coordinates from RFID tags on the floor. Emotion modules of the CPR Interaction system stimulate human touch-sense through vibrations, olfactory-sense through perfumes, and visual-sense through motion patterns. Biometric signals of human can be effectively measured with ECG and EDR. Experimental results show these easy-to-mount on CPR Equipments are sufficient for generating reliable signal measurements. People will rely more and more on robotic assistants in the near future. Personal robots will lead the way to the new era. CPR provides a stepping stone.