• Journal of Internet Computing and Services
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• v.11 no.1
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• pp.71-76
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• 2010

This research proposed the method for application of SCORM in U-learning system. That is, I proposed the API broker to connect between U-learning and API Instance of RTE that is existing SCORM based learning object interface environment. The API broker operated handling process using request port and response port between SCORM and U-learning server. For efficient operation in each service, this system has learning contents service buffer in API broker.

• Journal of Internet Computing and Services
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• v.13 no.4
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• pp.63-71
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• 2012

This paper presents a design and implementation of U-Seum(Ubiquitous Museum) system based on the LBS(Location Based Service) and mobile augmented reality technique. The mobile services under the smart space of the ubiquitous environments have been expanded in the various fields. In this study, we introduce U-Seum which supports tourists in the museum. U-Seum is developed by use of the position tracking technique based on Wi-Fi and mobile augmented reality. The GPS which is widely used in the position tracking has a difficulty to be utilized in the inside of the building because it requires the Line-of-Sight between a sender and a receiver. Therefore, in this paper, we develop a realtime tour-supported service through experience and evaluate the performance of the system in the world famous UNESCO's Hwa-Seong Museum by measuring the distance from the Wi-Fi signal which is suitable to track the position interior of the museum. U-Seum provides various push services such as mobile augmented reality service for explanation of the artifacts of the museum, game services and the statistics information of the tourist when the tourist approach a specific AP. U-Seum is developed in the Haw-Seong Museum by the support of the Swon Haw-Seong Cultural Foundation. With a field test, we prove that the excellence and expandability of the system.

• Spatial Information Research
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• v.20 no.6
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• pp.119-127
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• 2012

u-City is next generation city which can innovate functions of city. It can realize increase of convenience, improvement of life quality and safety guarantee by convergence of information technologies and ubiquitous service with urban space. Market of u-City is in range of rapid growth and u-City can make enormous synergy effects by accompanying construction technologies with spatial information, sensor technologies, communications network and related equipments. In this study, we analyzed the domestic/abroad status, researches and element technologies involved in u-City. And, we suggested overseas expansion strategy of u-City such as selection and analysis of target nations, packaging method of u-City service models and application of BIM/GIS connection technologies in terms of u-City construction and operation.

• The KIPS Transactions:PartC
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• v.17C no.2
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• pp.135-144
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• 2010

U-City pursues personalized service by collecting contexts through sensors located over the city and presenting the service automatically depending not on the user's request but on the situations that are needed. To provide the personalized service, however, contexts collected through various sensors are needed, and they include private information. Therefore, it is important to keep a balance between the convenience by presenting service and protecting private information. In this paper, we classify and grade person's various contexts requested in the personalized service environment. Based on these, we make decisions on whether to present the service or not by profile-matching between user profile and service profile. Also, we propose an efficient privacy-protection management scheme to encrypt transmitted private information and to control key distribution.

• 한국IT서비스학회:학술대회논문집
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• 2008.05a
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• pp.462-467
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• 2008

본 논문에서는 유비쿼터스 서비스간의 변환을 통하여 유비쿼터스 서비스 통합 및 제어를 위한 유비쿼터스 홈(u-Home) 서비스 통합 모델을 제시하고 있으며, 이러한 유비쿼터스 서비스간의 변환은 SOA(Service-oriented architecture)을 기반으로 하는 서비스 변환 게이트웨이 엔진을 이용하여 이루어진다. 이 SOA기반의 서비스 변환 게이트웨이 엔진을 이용한 u-Home 서비스 통합 모델은 유비쿼터스 서비스들을 웹 서비스 형태의 서비스로 변환하고, 이를 이용해 유비쿼터스 서비스들을 일괄되게 제어할 수 있게 하여, u-Home 내에서의 유비쿼터스 서비스 통합을 이루도록 하기 위한 유비쿼터스 서비스 모델이다.

• 한국방재학회:학술대회논문집
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• 2008.02a
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• pp.343-347
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• 2008

In Korea it continues to grow elderly population, especially the elderly who lived alone and above-average temperatures is increased by global worming lately. So that, to take immediate action and to solve social isolation for elderly people living alone, we prospect it plays an important role ubiquitous information technology(IT) such as Geosensor based on GIS, RFID and wireless sensor networks, etc. In this paper, we searched domestic and foreign response status of heat wave for the elderly and proposed u-Care service for the elderly to stay indoors during heatwave warning. In future, we will design u-Care system and carry out various researches on accuracy, revitalization, the law, etc.

• 한국정보통신설비학회:학술대회논문집
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• 2008.08a
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• pp.55-58
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• 2008

This article describes power supply infrastructure construction methods which are considered from U-City infrastructure. For the eisting city and town, it is one the issue to find an economic method to construct outside infrastructure including ubiquitous service device. Because the economic construction method could minimize the construction budget which cost big portion of U-City. And the power supply infrastructure is the fundamental layer to keep network and service layer stable. This paper suggests several ways to construct methods with keeping pre-constructed underground power cable by attaching inepensive power nodal controller working in zigbee network and introduces how to monitor and mana ge the status of power supply to network and service device.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.12 no.7
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• pp.1321-1328
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• 2008

The monitoring and controlling systems on middleware for agriculture service instead of pigpen is focused on context-awareness and event-centric structure in this paper. By processing and monitoring context information which obtained from a sensor field, the u-Farm middleware is to promptly provide the response for various queries from agriculture's application service. It allows a device to provide optimal ubiquitous farm environment.

• Proceedings of the Computational Structural Engineering Institute Conference
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• 2010.04a
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• pp.605-608
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• 2010

효율적인 국토관리 및 국가산업 육성, 이를 통한 대시민 서비스를 강화하고자 U-City 구현이 활발히 진행되고 있다. 국내의 경우 U-City 구현을 위한 인프라 및 요소기술들에 대한 연구가 활발히 진행되고 있으나 서비스, 공간 등에 대한 연구와 상호 호환 및 연동에 대한 기반 연구가 부족한 실정이다. 또한 도시민의 수요와 요구를 제대로 반영하지 못하는 서비스 제공과 개념적으로 동일하거나 유사한 서비스가 중복 개발되는 문제가 발생하고 있다. 이러한 U-서비스의 과다한 중복생산을 지양하고, U-City에 거주하는 도시민들이 체감할 수 있는 시민친화적 서비스를 도출을 위한 연구의 필요성이 제기되고 있다. 본 논문에서는 도시민의 요구를 반영한 수요자 중심의 서비스 항목을 도출하였고, 서비스 제공의 우선순위를 제안하였다. 따라서 U-서비스 도입시의 파급효과를 극대화하고 결과의 타당성 한계를 극복하고자 한다.

• Journal of the Korea Convergence Society
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• v.3 no.4
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• pp.1-5
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• 2012

The fast-paced development in the field of U-Healthcare, which is available anytime and anywhere, is being underway in accordance with the development of IT technology. U-Healthcare technology has various security threats because it is based on network. The purpose of this paper is to examine the threats of DOS / DDOS attacks based on network attacks, and to propose the response technique that fit the situation of the U-Healthcare service by modifying the existing Detecting Early DOS / DDOS attacks through Packet Counting.