• The Journal of the Korea institute of electronic communication sciences
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• v.8 no.10
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• pp.1491-1497
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• 2013

Radio frequency identification (RFID) is an important and essential components of ubiquitous computing, with the development of wireless communication technologies and mobile computing environment. Recently, RFID becomes the mainstream application that helps fast handling and uniquely identifying the physical objects. It utilizes the electromagnetic energy for data transmission from a tag to a reader in the presence of arbitrary interference and noise. In order to employ the portable mobile RFID reader, a tag-collision problem between two or more adjacent tags should be considered. In this paper, we present the operation of RFID system in which numerous tags are present in the interrogation zone of a single reader at the same time. Since there may exist a number of tagged objects in the narrow area, multiple RFID tags may interfere each other, caused to degrade the data reliability and efficiency of the RFID system. In order to suppress interference signals from multiple neighboring tags, we present an application of Gold code for RFID communication system, which uses spread spectrum technique. In this RFID system, data bits are spreaded in each tags with the unique Gold code and the spreaded data bits are despreaded in the reader with the same Gold code. The performance analysis of the considered RFID anti-collision system is illustrated via computer simulation examples.

• Journal of the Korea Society of Computer and Information
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• v.19 no.6
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• pp.109-117
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• 2014

A cold storage is a warehouse of a insulated building with cooling installations. It has many different types of cold rooms with temperatures below 0 degrees Celsius, and the sequential workflow such as receiving, picking and packing runs in that rooms. Recently, the cold storages have adopted RFID technology, and consequently, warehouse product management in them are becoming intelligent and network. However, information inconsistency in warehouses caused by physical and logical errors reduces reliability in the RFID cold storage management system and worsens their work efficiency. Therefore, it is necessary to develop an early detection system to identify errors. In this paper, we suggest a supervisory system detecting logical errors on business processes of the RFID cold storage. It is composed of a master supervisor and mobile supervisor. In the master supervisor, the manager can set the constraints conditions and get alerts, and in the mobile supervisor, the workers confirm and deal with these faults directly. The supervisory system improve reliability of the RFID cold storage management system by recognizing a failure to identify physically and logically using these constraint conditions. This paper shows that the supervisory system can reduce the average recovery time to improve reliability by decreasing the time for detecting and analyzing errors in the RFID cold storage management system.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2018.10a
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• pp.434-436
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• 2018

Accidents of commuting vehicles for preschoolers continue to occur despite various safety policies from the government. In order to minimize such accidents, it is necessary to use both the vehicle-mounted safety commutation management software for the driver, and the mobile App to manage the safe schooling of the children that can inform such information to parents in time. In this paper, we describe the design and implementation of the safety management software architecture. The mobile application is designed for Android operating systems. It informs current driving information if the bus as well as the list of current boarded children. Teacher in the bus can manage exceptional cases such as riding child without RFID and unregistered temporary riders like grandparent for convenience and flexibility.

• 한국HCI학회:학술대회논문집
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• 2007.02a
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• pp.348-353
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• 2007

사회구조가 고도화됨에 따라서 사용자들은 크고 복잡한 환경에 노출되고 있다. 이러한 환경은 사용자들이 자신의 위치가 어디인지를 인식하게 어렵게 하고 있다. 그에 따라서 사용자에게 지도나 키오스크 시스템[1]과 같은 위치 안내 서비스를 제공하고 있다. 하지만 이런 서비스는 2D 기반의 안내를 하기 때문에 사용자가 직관적, 공간적으로 자신의 위치를 파악하기란 어렵다. 직접 시스템에 찾아가야 서비스를 사용할 수 있으며, 서비스의 제공이 지속적이지 않고, 순간적이라는 단점이 있다. 본 논문에서는 사용자가 이동하면서 자신이 찾고자 하는 위치에 대한 안내를 3D 가상현실 기반의 위치 안내를 받을 수 있는 모바일 PC를 위한 위치 기반 서비스(Location Based Service)를 제공한다. 제안하는 시스템은 사용자의 현재의 위치를 인식하기 위해서 모바일 PC에 GPS와 RFID태그를 이용한다. 이를 실내외 공간에서의 위치를 인식을 하게 되며, 사용자의 현재 위치에서 자신이 가고자 하는 목표장소에 대한 최단 경로를 알려 준다. 뿐만 아니라 여러 장소를 방문하는 경우, 미리 만든 스케쥴에 따라서 위치 안내 서비스를 받을 수 있다. 제안하는 시스템은 사용자가 전시장, 병원, 관공서 등의 건물에서 원하는 위치를 자신이 있는 위치에서 편하고 간편하게 찾아 줄 수 있으며, 부가적으로 다양한 위치 기반 서비스들이 적용 가능하다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2011.05a
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• pp.519-521
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• 2011

NFC is enable communication between wireless davice within a distance of 10cm, one type of non-contanct short-range wireless communicaton using 13.56MHz frequency band. This is one type of RFID technology which include file transfer, contactless payment and RFID. NFC technology is standardized in 2003 already, it received much attention recently because NFC is announced full support in Android 2.3. And as APPLE is announced that have plan to monunt in iphone 5,mobile payment system is expected to change. Already SAMSUNG is launched NEXUS S mounted NFC chip and announced NFC chip will be mount GALAXY S2 LG Electronics is statemented NFC chip will be mount on smart phone that will realese this year. In this study, will announce about analysis for NFC technology and recently trend and used case.

• Journal of Digital Contents Society
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• v.8 no.4
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• pp.431-439
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• 2007

In the ubiquitous which is rapidly developing with ultra speed these days, constructing the u-Campus which is using the sensor-network as its base is keep developing. Also, any information related equipments like PC and mobile, computing is possible whenever and wherever you want and due to the development of the wireless network, the service environment is continually developing. In this article, I'd like to suggest the u-Campus which is very suitable to the user's environment which had used application of mobile. In u-Campus, various techniques are adopted and applied along with development of info-communication related technidques. Especially, the new type of campus which is constructed by adopting the ubiquitous computing net-work technique to the campus of university is the u-Campus. In this article, by suggesting u-Yuhan designing methods, more effective and advanced school activities of students to make possible.

• The Journal of the Korea Contents Association
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• v.8 no.10
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• pp.1-10
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• 2008

The traditional barcode based medicine logistics system have the problems such as loss, management error, online track, public information due to the hand-operated logistic process. Otherwise, quick response allows that the company observe the requests consistently and design medicine and establish manufacture schedule rapidly so that they could prohibit the product stocked. In this paper, we analyzed how to process medicine circulation logistics and information steps practically and proposed the RFID based medicine logistics system for the quick response in hospital. The proposed method provided the medical history tracing service, the traditional system connection, the efficiency logistic service, and the narcotic specified management service using the medicine logistics information from RFID tag. Accordingly, the satisfaction and the productivity will be improved the efficient medicine logistics by reducing the loss as well as the management error.

• Journal of the Institute of Electronics Engineers of Korea CI
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• v.45 no.3
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• pp.68-74
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• 2008

The Ubiquitous Society is being attained gradually as it got through the step of super-high speed internet mobile and digital convergence. Now, it is being variously spread to no only the little ordinaries of communication but also fields of economy and industry. Specially, RFID and Navigation are being issued at home and foreign. These are prospected to give assistances that it bring along the competitive power of nation. But inflection range of RFID and Navigation is localized in the most sin lest. This paper proposes system to reflect the individual and special quality using RFID and Navigation and to fit easily changing environment. And we studied to use what kinds of information in the special environment. We used Fuzzy Logie and TSP for making the intelligent navigation system with more information.

• Spatial Information Research
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• v.16 no.1
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• pp.65-77
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• 2008

There have been many studies and technologies that define a current location of a moving vehicle with GPS(Global Positioning System). However, the navigation system with GPS has troubles to search an optimized route considering data such as realtime parking status and road conditions. Moreover, the GPS systems show malfunction in the downtown with very tall buildings, underground parking lot and the inside of buildings. On the contrary, the RFID systems are able to reflect real-time status of parking lots and roads in the downtown. This paper proposes a system of guiding path for parking lots to consider real-time constraints based on RFID. The results obtained from the implemented system show smooth guiding of a new route after immediately sensoring the change of the information of parking lots and roads: if a parking lot that a vehicle is heading to is fully occupied, the system re-searches a new route for a neighbor parking lot and immediately transfers it to customer's mobile, and if the designated route is under construction, the system guides a detour path. The proposed method will be useful for advanced integrated parking control system.

• Journal of the Korea Society of Computer and Information
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• v.14 no.9
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• pp.75-84
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• 2009

In this paper, the EPC Network as the most important technologies in the field of applied technology research and special attention to the use of RFID to better manage the disease in infected U-MAS (U-Medical Administrative Services) system was designed. U-MAS system, the Center for Disease Control in the illness, depending on the type of isolate and treat infected patients, recovery, discharge, isolation wards and intensive italian to manage and increase efficiency, manual and use a simple computer program improve the qualify of the current level, using RFID tags to improve the management of the patient everything that a little more and be out of the isolation ward, if competent disease management districts, such as the location to respond more quickly to facilitate the purpose is to contribute to. First, EPC Network and related technology for mobile RFID systems and related technology research. U-MAS system design offers. If you take advantage of the proposed U-MAS system for monitoring infectious disease patients and patients in the isolation ward, when the unauthorized departure location to shorten the time it takes to improve the effectiveness of disease management and present the elected effects was.