• Title, Summary, Keyword: OBU

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Development of Eco Driving Support Hi-pass Device for Commercial Vehicles (상용차 에코드라이빙 지원 하이패스 단말 개발)

  • Park, Yong Kuk;Lee, Min Goo;Jung, Kyung Kwon
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • pp.969-972
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    • 2013
  • In this paper, we presented high-pass OBU device to support eco driving for commercial vehicles such as heavy trucks. The proposed OBU is convergence OBU (On Board Units) platform with high-pass toll functions and eco driving functions. In order to verity performance of proposed OBU device, we conducted test drives on road.

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Self-Assembled and Alternative Porphyrin-Phthalocyanine Array

  • Kwag, Gwang-Hoon;Park, Eun-Joo;Kim, Sung-Hyun
    • Bulletin of the Korean Chemical Society
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    • v.25 no.2
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    • pp.298-300
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    • 2004
  • An alternative molecular porphyrin-phthalocyanine aggregate was prepared and characterized with UV-visible and X-ray absorption spectroscopies. UV-visible experiments evidence 1-dimensional porphyrin-phthalo-cyanine array formed by mixing $SnTPPCl_2 ({\lambda}_{max}=429,\;{\varepsilon}=2.4{\times10^ 5 /M{\cdot}cm)\;and\;NiPc(OBu)_8({\lambda}_{max}=744 nm,\;{\varepsilon}= 2.0{\times}10^ 5 /M{\cdot}cm)$ in solution. In the UV-visible spectrum of the porphyrin-phthalocyanine array, $(SnPNiPc)_n$, a new Q-band appeared at 844 nm with decrease of the Q-band peak of $NiPc(OBu)_8$ at 744 nm. The red-shift of Q-band evidences an alternative porphyrin-phthalocyanine array formed in solution through metal-halide interaction rather than ${\pi}-{\pi}$ facial interaction, in which nickel of $NiPc(OBu)_8$ coordinates with chloride of $SnTPPCl_2$ through self assembly. Ni K-edge XANES (X-ray absorption near edge structure) spectra also support the axial ligation of nickel to chloride. The square planar structure of $NiPc(OBu)_8$ turns to an octahedral structure in (SnPNiPcSnP) by axial ligation. A higher energy-shift (0.2 eV) of the preedge peak of (SnPNiPcSnP) indicaties partial oxidation of nickel by charge transfer from NiPc$(OBu)_8$ to SnTPPCl$_2$.

Forecasting Market Demand of u-Transportation Vehicle Sensor OBU (u-Transportation UVS 단말기 시장수요예측)

  • Jeong, Eon-Su;Kim, Won-Kyu;Kim, Min-Heon;Kim, Byung-Jong;Kim, Song-Ju
    • 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.

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A Multi Medium Wireless Communication Vehicle Terminal Development and a Performance Test (다매체 무선통신 차량 단말 개발 및 성능평가)

  • Kim, Sang-Heon;Cho, Yung-Sung;Kim, Kyoung-Hwan;Bae, Myoung-Hwan;Lee, Kyeong-Im
    • The Journal of The Korea Institute of Intelligent Transport Systems
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    • v.10 no.5
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    • pp.135-145
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    • 2011
  • As communication technology, an enabling technology for ITS, becomes diversified with DSRC, CDMA, Wireless LAN, it is expected that type and function of ITS services will become gradually expanded. As a result, research and development of a standard platform that can provide support so that numerous communication technologies that are being used in various ITS services to receive various ITS services can be operated in one integrated terminal are being carried out. On Board Unit (OBU) for a recent standard platform was also built and tested recently. However, verification for standard suitability of the standard platform OBU that was developed must be carried out. Standard technology must be realized and sufficient functional and operational testing must be carried out in order to guarantee efficient operation in an actual ITS system and increase utilization of standard technology. Therefore, In this paper we had constructed test road and we had tested a standard platform OBU for a standard application.

A Handover Protocol for the IEEE WAVE-based Wireless Networks (IEEE WAVE 기반의 무선 네트워크를 위한 핸드오버 프로토콜)

  • Choi, Jung-Wook;Lee, Hyuk-Joon;Choi, Yong-Hoon;Chung, Young-Uk
    • The Journal of The Korea Institute of Intelligent Transport Systems
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    • v.10 no.1
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    • pp.76-83
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    • 2011
  • The IEEE WAVE-based communication systems do not provide handover services since most of the application layer messages of a small amount containing text data that are related to safe driving. Multimedia data service such as web pages and CCTV video clips, however, require a seamless handover for continuation of a session via multiple RSUs. In this paper, we propose a new proactive handover protocol based on IEEE WAVE. According to the proposed handover protocol, the OBU notifies the old RSU of its departure from the coverage such that the old RSU forwards to the new RSU the data heading towards the OBU to be cached for the further delivery upon its entry into the new RSU's coverage. The simulation results are presented which shows the performance of the proposed protocol in terms of throughput, delivery ratio and handover delay.

Information Transfer Method of Dangerous Road Condition (도로 위험 상황의 전송 방법)

  • An, Soo-Jin;Kim, Young-Wook;Han, Min-Hong
    • Journal of the Korea Society of Computer and Information
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    • v.12 no.1
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    • pp.189-197
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    • 2007
  • Developed safety system which transfers danger information to rear cars for accident prevention when drivers detect a accident, a dropping or a freezing during driving on the high way. To prevent an accident, each vehicles mount OBU which is made up of a GPS unit and a transmitter-receiver and the trace of road is always renewed and saved in OBU per a regular past distance. When the driver see dangerous situation, transfer a danger pattern and a trace information by pressing button. All cars which receive information compare the received data with the original data. And then, only cars which are located at the rear in a regular distance respond and occur a warning. Performed a road test at the rate of $30{\sim}50$ kilometer a hour using two test cars which saved about 120meter's space between them were mounted OBU which had 447Mhz transceiver. As a result of the experiment, communication between test cars had no problem. Accordingly, it can use a safety driving device because driver can notice a danger situation and set themselves ready for it using this system in advance.

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Implementation of Road Weather Information System Supporting Intelligent Transportation Systems Based on USN (센서 네트워크 기반의 지능형 교통 시스템 지원을 위한 RWIS 구현)

  • Park, Hyun-Moon;Park, Soo-Huyn;Park, Woo-Chool;Seo, Hae-Moon
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.35 no.3B
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    • pp.485-492
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    • 2010
  • Intelligent Transport System(ITS) has been studied in various systems, such as road environment information offering, vehicle short-range wireless/wire communication, vehicle collision preventing and pedestrian safety offering systems. Related to this, the USN technology based on the sensing accuracy for motorists and pedestrians safety, the information reliability, the maintenance and convenience for Sensor Network is highlighted. This study uses various sensors to construct USN to the road, and connect it to the developed RSU so it collects the real-time road environment information and offers it to OBU and Traffic Control Surveillance Center with Road Weather Information System. RSU collects roadside information for driver's safety and analyzes it to offer IP and beacon service according to the service priority to OBU & upper layer terminal. In the upper layer terminal it is developed the IP based Settop Box application program to offer the urban traffic information & road environment, and environment sensor error, etc. Finally, RWIS develops the real-time collection of roadside information to complement the driver's safety to the intelligent traffic system, and presents various service modes with technology convergence.

A Study on Traffic Information Service and Collection by the Use of DSRC Technology (DSRC통신 기반 교통정보 제공 및 수집에 관한 연구)

  • Yang, Won-Mo;Bang, Jeong-Hyeon;Kim, Gyu-Ok
    • Proceedings of the KOR-KST Conference
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    • pp.399-408
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    • 2007
  • Dedicated Short Range Communications(DSRC) is a block of spectrum in the 5.8GHz band. DSRC is the useful technology of ITS Service. Japan operates ETCS, VICS by DSRC technology and DSRC technology is used ETCS Standard in Korea. There are many kind of utilization of DSRC in ITS. This is a study for traffic information service and collection with DSRC. Traffic management server service traffic information to driving vehicle by RSE(Road Side Equipment). OBU(Onboard Unit) in vehicle send the information to PDA(Personal Digital Assistant). Client S/W show the information to driver by text, pictogram, sound and return PDA H/W ID to OBU. Server make section traffic information by the PDA H/W ID information.

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Performance Evaluation of IEEE 802.11p Based WAVE Communication Systems at MAC Layer (MAC 계층에서의 IEEE 802.11p 기반 WAVE 통신 시스템의 성능 평가)

  • Choi, Kwang Joo;Kim, Jin Kwan;Park, Sang Kyu
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.25 no.5
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    • pp.526-531
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    • 2014
  • Vehicular communications have been receiving much attention in intelligent transport systems(ITS) by combining communication technology with automobile industries. In general, vehicular communication can be used for vehicle-to-vehicle(V2V) and vehicle-to-infrastructure( V2I) communication by adopting IEEE802.11p/1609 standard which is commonly known as wireless access in vehicular environment(WAVE). WAVE system transmits signal in 5.835~5.925 GHz frequency band with orthogonal frequency division multiplexing(OFDM) signaling. In this paper, after 32 bit processed the channel monitoring in MAC(Media Access Control) layer of WAVE system implemented according to IEEE 802.11p standard, data were received and we evaluated the performance, we built the test bed consisting of OBU(On Board Unit) in the real expressway. We transmitted WSM(WAVE Short Message) and received WSM between OBU wirelessly. And then, we calculated channel occupancy time per one frame and throughput, and evaluated the performance.

A Study on Design of Microstrip Patch Antenna for Dedicated Short Range Communication (DSRC용 마이크로스트립 패치 안테나 설계 연구)

  • Park, Byeong-Ho;Choi, Yong-Seok;Seong, Hyeon-Kyeong
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.19 no.2
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    • pp.393-400
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    • 2015
  • As the development and distribution of the intelligent transport system is spreading recently and some of the services are commercialized through a pilot project, interest in DSRC with high utilization is increasing and antennas for roadside and on board equipment are being studied. A single patch was used for a vehicle antenna due to the requests of miniaturization of size, but there was performance degradation in most cases due to miniaturization. In addition, some methods to improve performance have been used in the antennas that were previously researched using the arrays, but they have the disadvantages of bulkiness in size of the antennas when using the arrays. Therefore, in this paper, the CPW fed microstrip patch antenna with the simple structure of being compact and easy to produce, which can be used in the OBU of DSRC, was designed.