• KSCE Journal of Civil and Environmental Engineering Research
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• v.26 no.2D
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• pp.259-263
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• 2006

As the concept of Ubiquitous Computing has become an important issue, we need to have a voice in the field of Transportation. Ubiquitous Computing means that IT network based on realization of 5 Any(Anytime, Anywhere, Anything, Anynetwork, Anydevice) is deeply penetrated into our daily life. As ITS has developed with the aid of IT and Transportation Technology together, we need to discuss u-Transportation concept with Ubiquitous Computing and Transportation Technology. According to the recent papers and studies, Transportation or Transportation Information sector is mentioned as a major application of Ubiquitous Computing. However, most of the studies are limited to the basic concept without any in-depth understanding about Transportation. This paper present the implementation of u-Transportation and the role of Transportation Technology based on recent technology trend.

• Journal of The Institute of Information and Telecommunication Facilities Engineering
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• v.8 no.4
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• pp.157-162
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• 2009

This study's purpose is to forecast the market demand of UVS (u-Transportation Vehicle Sensor) OBU (On-board Unit) of the ubiquitous Transportation. Bass model, Logistic model, and Gompertz model were used for the forecasting market demand. Firstly, this research focused on the market size for the u-T OBU. All three models were used for the market size prediction and the average values were used. The Bass model were calibrated and the market demand for the UVS OBU of the u-Transportation system were estimated using this model.

• Information and Communications Magazine
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• v.29 no.2
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• pp.52-58
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• 2012

u-T 연구단은 2006년부터 현재까지 약 5년 5개월 동안 한국교통연구원을 비롯한 교통, 통신 분야의 총 39개 전문기관이 참여하여 연구를 수행하였다. u-Transportation 구현하기 위해, System Engineering 기술, Technology Development, Service Development의 세부과제로 구성하였다. 1차년도~4차년도까지 u-T 기반기술을 개발하고, 5차년도는 개발된 u-T 기술의 기능과 성능을 극대화하기 위하여 실제 남양주시 일부 구간에 Testbed를 구축하여, u-T 기술과 서비스간의 통합과 서비스별 평가를 검증하였다. 향후, u-Transportation 기술이 활성화 된다면 언제 어디서나 쉽고 편리하게 접속 가능한 유비쿼터스 환경 하에서 교통상황에 적합한 맞춤형 정보를 제공해 줌으로써 도로이용자들의 통행선택을 다양화하여 도로 이용효율을 높일 수 있을 것이다.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.29 no.4D
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• pp.459-465
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• 2009

u-T (ubiquitous transportation) environment can be envisioned as an advanced version of ITS environment and be expected to provide more advanced transportation service in a ubiquitous manner. As a basic necessity to measure traffic flow in both environments, a flow estimation method was proposed. Flows have been measured in existing ITS and in a new u-T environments and some differences were investigated using simulation technique. In the interrupted traffic situation, the flow rate of u-T is 3.58% higher than that in ITS environment. Both MARE and MAE, which were used as measure of effectiveness, in u-T were better since the results are 31.4% and 31.1% lower than in ITS, respectively. Besides the equality coefficient in u-T was 1.9% higher than that in ITS. Such being the case, the flow rate measured in u-T using U-TSN is more reliable and can be expected to be successfully used for transportation system design or traffic operation areas.

• The Journal of The Korea Institute of Intelligent Transport Systems
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• v.12 no.5
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• pp.61-72
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• 2013

Next-generation ITS(Intelligent Transportation System) adopts WAVE(Wireless Access in Vehicular Environment) system which is capable of the bidirectional communication system in vehicular environments. u-Transportation system adopted WAVE communications system to show the optimal performance in terms of various services with regard to vehicle safety and traffic. In this paper, we introduce testbed of ubiquitous-Transportation system and its service. Then, we describe WAVE system for supporting next-generation ITS service. Also, we carried out tests in real road environments in order to verify communication functions of WAVE systems and its performance. We confirmed that our communication systems for supporting services meet the communication performance.

• Journal of the Institute of Electronics Engineers of Korea TC
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• v.47 no.6
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• pp.35-41
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• 2010

The ubiquitous-transportation sensor network (u-TSN) system is a next generation transportation system that provides traffic information through analysis and processing periodic information from vehicles. In this paper, we propose the adequate transmission scheme from vehicles for collecting vehicular information. The conventional scheme is transmitting each vehicle information every 0.1s. A variable transmission period scheme is proposed in this paper according to vehicle speed. The proposed and conventional schemes are compared with computer simulations.

• Transportation Technology and Policy
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• v.3 no.4
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• pp.47-60
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• 2006

• Proceedings of the Computational Structural Engineering Institute Conference
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• 2009.04a
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• pp.340-343
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• 2009

유비쿼터스 IT시대에 우리사회가 적절하게 대응하여 국민의 삶의 질을 향상시킴은 물론 새로운 성장 동력을 마련하는데 도움을 줄 수 있도록 u-City 서비스에 개발에 대한 움직임이 강하게 일고 있다. 이에 본 논문에서는 u-City내에서 발생할 수 있는 교통상황에 대하여 시민들에게 정보를 제공 할 수 있도록 교통정보관리 서비스에 관한 정의서를 작성 하였다. U-Transportation 교통정보관리 서비스의 프로세스, 서비스 주요기능을 정의하고, 비즈니스 모델 및 R&R, 시스템 구성 및 주요 기술, U-Space 공간적용을 분석하였다. 이를 통하여, u-Ctiy 내의 새로운 서비스 모델을 적용하고자 한다.

• Proceedings of the KOR-KST Conference
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• 2007.05a
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• pp.414-423
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• 2007

• Proceedings of the Korean Society of Computer Information Conference
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• 2024.01a
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• pp.347-348
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• 2024

본 논문에서는 철도 구성요소 모니터링을 위한 효율적인 객체 분할 기법으로 사전학습된 SegFormer 모델의 적용을 제안하고, 객체 분할을 위해 보편적으로 사용되는 U-Net 모델과의 성능 비교 분석을 진행하였다. 철도의 주요 구성요소인 선로, 침목, 고정 장치, 배경을 분할할 수 있도록 라벨링된 데이터셋을 학습에 사용하였다. SegFormer 모델이 대조군인 U-Net보다 성능이 Jaccard Score 기준 5.29% 향상됨에 따라 Vision Transformer 기반의 모델이 기존 CNN 기반 모델의 이미지의 전역적인 문맥을 파악하기 상대적으로 어렵다는 한계를 극복하고, 철도 구성요소 객체 분할에 더욱 효율적인 모델임을 확인한다.