• Journal of Digital Convergence
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• v.10 no.7
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• pp.185-192
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• 2012

The ultimate purpose of cities is 'the enhancement of quality of life in city'. In order to achieve this, it is required to optimize the Ontology-driven ubiquitous services included in the U-City and UIS of regions and communities and so on. Almost U-Service's contents are related to spatial or temporal extent. So it is important to design Spatio-temporal event schema for efficient access to U-City. There is a rapid change into an urban society in the shape of Ontology-driven ubiquitous services in which a content on a region or an incident is newly reconstructed through various ideas with the influence of the ubiquitous environment.

• Spatial Information Research
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• v.23 no.3
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• pp.55-65
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• 2015

It was necessary for us to establish a U-City Integrated platform to handle information and to operate the processes in order to solve various social problems in the modern cities and environment. As time has passed, we have confronted to difficulty in handling massive data with limited storage and computing environment and in not satisfying all the new requirements and on time information from the publics. The bigger the cost of the operation of the platform got, the more doubts to keep and invest more to upgrade it arose. Here, we investigated the limitations of the U-city platforms and analyzed the additional requirements and each function of the platform. In order to meet the requirement, we applied new technologies to deal with massive data and suggested the infrastructure of computing environment. We will be expecting the cost decreasing effects and the benefit increasing effects from the enhancement of U-City platform.

• Journal of Advanced Navigation Technology
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• v.16 no.3
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• pp.480-487
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• 2012

In Busan, the structural limitations of the road, is causing severe traffic congestion and low speed of the vehicle. So the existing traffic control system needs improvements to its structure. A study on Optimal Traffic Signal System and Improvement for User Oriented Public Transit Service are required. U-city is a city or region with ubiquitous information technology. All information systems are linked, and virtually everything is linked to an information technologies. U-Traffic goal is to maximize of traffic information services based on advanced information technology to integrate of transportation infrastructure. The objectives of this research are : a vehicle detection method through a variety of sensors, an algorithm of the traffic signal system, a design and implementation a simulator to compare between the fixed traffic signal and adaptive traffic signal system. This simulator will have allowed analysis techniques for the study of traffic control. Results of simulator test shows that traffic congestion can be some reduce.

• 한국정보통신설비학회:학술대회논문집
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• 2009.08a
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• pp.7-10
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• 2009

u-City는 첨단 정보통신 인프라와 유비퀴터스 정보 처리를 도시공간에 융합해서 도시민에게 편리하고, 건강하며, 안전하고, 쾌적한 생활을 누리도록 하는 목표로삶의 질을 향상시키는 신개념의 도시이다. 도시기반시설인 도로는 이러한 u-City를 구축하는데 있어 핵심 구성요소 이지만, 도로 공간에서 발생하는 인명사고는 u-City의 목표인 안전한 도시를 구축하는데 있어 걸림돌이 되고 있는 것이 현실이다. 따라서, 본 논문에서는 안전한 도시 구축을 위하여 USN 기술을 활용하여 횡단보도 주변에서 보행자의 안전을 지원하는 시마트 연석에 대한 개념과 개발 내용을 소개하고자한다. 스마트 연석은 도로 연석과 동일한 크기로 설치되어 지상에 돌출되지 않으므로 주위 환경과 잘어울리며, 상부 모서리에 경광등이 점멸되어 운전자로 하여금 횡단보도 지역임을 쉽게 알 수 있도록 하고, 측면에서 바닥비춤조명을 비춤으로써 운전자의 시인성을 높여 안전사고를 미연에 방지하는 기능을 가지고 있다.

• Proceedings of the Korea Technology Innovation Society Conference
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• 2006.11b
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• pp.273-286
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• 2006

• 한국방재학회:학술대회논문집
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• 2008.02a
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• pp.405-408
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• 2008

Up to now, a lot of houses, roads and other urban facilities have been damaged by natural disasters such as flash floods and landslides. It is reported that the size and frequency of disasters are growing greatly due to global warming. In order to mitigate such disaster, flood forecasting and alerting systems have been developed for the Han river, Geum river, Nak-dong river and Young-san river. These systems, however, do not help small municipal departments cope with the threat of flood. In this study, a real-time urban flood forecasting service (U-FFS) is developed for ubiquitous computing city which includes small river basins. A test bed is deployed at Tan-cheon in Gyeonggido to verify U-FFS. It is found that U-FFS can forecast the water level of outlet of river basin and provide real-time data through internet during heavy rain. Furthermore, it is expected that U-FFS presented in this study can be applied to ubiquitous computing city (u-City) and/or other cities which have suffered from flood damage for a long time.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.11 no.7
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• pp.2632-2637
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• 2010

Information in UbiComp Environment are transformed to knowledge by relationship in a spatio-temporal location, and then became intelligent contents with task procedures or application models. The entities in U-City has lots of relationships. It is important in U-City contents to provide intelligent and personalized response to meet the intention of users. We extend the spatial ontology model of SPIRIT to other domain. Domain ontologies are consist of type, relation, and instance ontologies. When the relationship model by shared concepts are not defined, we used the spatio-temporal events to find relationships. So we proposed the methods to recommend semantically related terms, not syntactically.

• Journal of the Korean Association of Geographic Information Studies
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• v.20 no.1
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• pp.127-136
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• 2017

U-City laws are divided into three categories: intellectual laws, information superhighway laws, and integrated operation center laws. Previous studies have suggested that efficient infrastructure operation and management is necessary in Ubiquitous-City (U-City). However, infrastructure is often interpreted differently by different laws. The purpose of this study was to plan for the integrated operation of intelligent service facilities by comprehensively analyzing the law system of domestic intelligent service facilities and problems in operation and management based on this critical mind. For this, present conditions and problems of intelligent service facilities were found through interviews with people who are in charge of the law system and other practitioners. The necessity of integrated use, including city information generated from intelligent service facilities and installment locations, has been demonstrated. Government ministries and local governments have established various information systems using ICT and U-City laws that specify integrated management and operation, but do not clearly specify definitions for the specific responsibility and authority for main agents participating in facility operation. A system is needed to smoothly mediate the relevant divisions so that they can use installed equipment simultaneously for efficient operation in generating city information. This objective of this study was to prepare a unitary law system for efficient installment and management of intelligent service facilities by establishing a logically linked relationship among the relevant laws and regulations. This will provide a foundation for a management system that has an integrated linkage of intelligent service facilities.

• Information Systems Review
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• v.11 no.1
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• pp.197-215
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• 2009

As the ubiquitous technology has been widespread, the u-service development driven by the private sector is increasing these days. In this paper, a new development methodology of interactive u-services for a mixed-use complex in u-City is proposed. The current state-of-the-art IT, Web2.0, assumes that information must be communicated in both way, not only from service provides to users but also from users to service providers. Here the user-driven u-service will be utilized for service providers to customize user services. By this interactive u-service paradigm, the information users become the information providers so that the mixed-use complex will take advantage of massive information. Also, admitting that the mixed-use complex is limited in terms of the space size, the network effect of information and shared contents created through the interactive u-services can be maximized.

• Proceedings of the Korea Technology Innovation Society Conference
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• 2015.05a
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• pp.189-205
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• 2015