• Title, Summary, Keyword: RSE

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Coverage Extension of the Highway Dedicated Short Range Communication System based on a Fixed Relay

  • Choi, Kwang-Joo;Kim, Hak-Jae;Park, Sang-Kyu
    • The Journal of The Korea Institute of Intelligent Transport Systems
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    • v.8 no.1
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    • pp.30-36
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    • 2009
  • Dedicated Short Range Communication (DSRC) systems in urban areas are used to collect traffic information from vehicles and to provide vehicles with information received from Roadside Equipment (RSE) having a range of 100 meters (m). However, it is not practical to use RSE with a range of 100 m for express highways. In this paper, we expand the standard cell coverage of RSE to 300 m, and adopt fixed relays to cover sites that cannot communicate with the RSE. We demonstrate that the system using the fixed relays is more economical than using only RSE.

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Regulation of SoxR, the superoxide-sensory regulator in Escherichia coli.

  • Lee Joon-Hee;Koo Mi-Sun;Yeo Won-Sik;Roe Jung-Hye
    • Proceedings of the Microbiological Society of Korea Conference
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    • pp.24-31
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    • 2000
  • In order to find out SoxR-reducing system in E. coli, we generated Tn10-insertion mutants and screened for constitutive expression of SoxS in a soxS-lacZ fusion strain. One mutation was mapped in rseB, a gene in rseABC (Regulation of SigmaE) operon. The constitutive soxS-expressing phenotype was due to the polar effect on the downstream gene, rseC. RseC is likely to function as a component of SoxR reduction system because SoxR was kept in oxidized form to activate soxS expression in rseC mutant. RseC is an integral membrane protein with an N-terminal cysteine-rich domain in the cytoplasm. The functionally critical cysteines were determined by substitution mutagenesis. The truncated N-terminal domain of RseC reduced the soxS transcription by $50\%$ as judged by in vitro transcription assay. Currently RseC is believed to be a reducing factor for SoxR. However, the mechanism for the reduction needs further investigation.

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Modification of Physico-chemical Properties of Wheat Bran by Twin-screw Extrusion Process -1. Effect of Screw Configuration and Process Parameters on System Parameters- (이축 압출성형 공정에 의한 밀기울의 물리화학적 변형 -1. 스크류의 조합과 공정변수 조절에 따른 시스템 변수의 변화-)

  • Kim, Chong-Tai;Hwang, Jae-Kwan;Cho, Sung-Ja;Kim, Chul-Jin;Kim, Hae-Sung
    • Korean Journal of Food Science and Technology
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    • v.27 no.3
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    • pp.404-413
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    • 1995
  • System parameters (extrusion temperature, extrusion pressure, specific mechanical energy, mean residence time) were analysed on three different screw configurations during twin-screw extrusion of wheat bran. Experiments were conducted over a screw speed of $280{\sim}380\;rpm$, feed rate of $22{\sim}38\;kg/hr$ and moisture content of $17{\sim}33%$ using screws assembled with 3, 4, and 5 reverse screw elements (RSE) adjacent to the heating zone of the barrel. Extrusion temperature increased with increasing RSE but it decreased with increasing feed rate and moisture content. Decreasing the filling ratio of the screw resulted in a lower extrusion pressure, and increasing the length of the RSE gave similar results due to the higher temperature and lower viscosity of melted dough. It was also observed that increasing the feed rate and decreasing moisture content resulted in the reduced extrusion pressure. Specific mechanical energy (SME) decreased when the feed rate and moisture content increased, and SME increased when using RSE posses from 3 to 5. Screw configuration posses with 4 RSE yielded the longest RT, and the smaller the die hole, the higher the RT. In contrast, RT decreased when the feed rate increased. With increasing moisture content RT for 3 RSE increased, but that for 4 and 5 RSE decreased.

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Methodology for Determining RSE Spacing for Vehicle-Infrastructure Integration(VII) Based Traffic Information System (Focused on Uninterrupted Traffic Flow) (차량-인프라 연계(VII) 기반 교통정보시스템의 RSE 설치간격 결정 방법론 (연속류를 중심으로))

  • Park, Jun-Hyeong;O, Cheol;Im, Hui-Seop;Gang, Gyeong-Pyo
    • Journal of Korean Society of Transportation
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    • v.27 no.6
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    • pp.29-44
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    • 2009
  • A variety of research efforts, using advanced wireless communication technologies, have been made to develop more reliable traffic information system. This study presents a novel decentralized traffic information system based on vehicle infrastructure integration (VII). A major objective of this study was also to devise a methodology for determining appropriate spacing of roadside equipment (RSE) to fully exploit the benefits of the proposed VII-based traffic information system. Evaluation of travel time estimation accuracy was conducted with various RSE spacings and the market penetration rates of equipped vehicle. A microscopic traffic simulator, VISSIM, was used to obtain individual vehicle travel information for the evaluation. In addition, the ANOVA tests were conducted to draw statistically significant results of simulation analyses in determining the RSE spacing. It is expected that the proposed methodology will be a valuable precursor to implementing capability-enhanced next generation traffic information systems under the forthcoming ubiquitous transportation environment.

Antioxidant and Anti-adipogenic Effects of Kohlrabi and Radish Sprout Extracts (콜라비 새싹 추출물과 무순 추출물의 항산화 및 지방세포 분화 억제 활성)

  • Lee, Young-Jun;Kim, Jae-Hwan;Oh, Ji-Won;Shin, Gi-Hae;Lee, Jong Seok;Cho, Ju-Hyun;Park, Jin-Ju;Lim, Jeong-Ho;Lee, Ok-Hwan
    • Korean Journal of Food Science and Technology
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    • v.46 no.5
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    • pp.531-537
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    • 2014
  • Common cruciferous vegetables, kohlabi (Brassica oleracea) and radish (Raphanus sativus), contain phytochemicals such as glucosinolates and carotenoids. Therefore, this study investigated the antioxidant and anti-adipogenic effects of kohlrabi sprout extract (KSE) and radish sprout extract (RSE). The total carotenoid and glucosinolate contents of KSE and RSE were $39.50{\pm}0.67$ and $76.73{\pm}2.75mg/g$, respectively. The total glucosinolate contents of KSE and RSE were $2.65{\pm}0.02$ and $8.13{\pm}0.54mg/g$, respectively. The in vitro-antioxidative activities of KSE and RSE were significantly increased in a dose-dependent manner. Furthermore, ${\beta}$-carotene and glucosinolate-enriched KSE and RSE significantly inhibited lipid accumulation and reactive oxygen species production during the adipogenesis of 3T3-L1 preadipocytes. These results suggest that glucosinolate-enriched KSE and RSE, especially RSE, can be used in the treatment of obesity and as a natural source of antioxidants.

The Estimation of the Number of Spare Parts and the Changing Time about DSRC Road Side Equipment (단거리전용통신방식 노변기지국의 예비부품수 및 교체시기 산정)

  • Han, Dae-Hee;Lee, Chung-Won
    • The Journal of The Korea Institute of Intelligent Transport Systems
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    • v.6 no.3
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    • pp.174-182
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    • 2007
  • There are not many studies on the maintenance and replacement for the ITS equipments. Most of ITS center has no comprehensive regulation on the equipment replacement. This study was focusing on estimation of equipment replacement period and the number of spare parts in stock using the actual failure data of Road Side Equipment (RSE) by Dedicated Short Range Communication (DSRC). The failure data showed a type of bath-tub curves. The data, however, did not fit to any probability distribution curve, which means that the preventive replacement cannot be strongly applied for the RSE. In the aspect of practical strategy, this study suggest that repairing cost and failure frequency be used for decision of replacement of RSE after the 1 or 2 year warrant period. The future study needs to include more RSE failure data as well as other equipments of the ITS.

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Rectangular Region-based Selective Enhancement (RSE) for MPEG-4 FGS Video (MPEG-4 FGS 비디오를 위한 사각영역 기반의 선택적 향상기법)

  • 서광덕;신창호;김재균
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.28 no.6C
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    • pp.634-647
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    • 2003
  • In MPEG-4 FGS (fine granular scalability) video, SE (selective enhancement) function is adopted to enhance the subject quality of the region of interest (ROI). However, it has the problem of excessive bit-rate increase in the enhancement layer. We present a new rectangular region-based SE (RSE) algorithm to significantly reduce the overhead bits resulting from the standard SE. The proposed RSE is based on two new algorithms. The first is to apply the SE function to a rectangular region. By doing so, we can reduce the required bits for describing the selectively enhanced region. The second is to use constrained bit-plane scanning (CBS) to encode bit-planes of the enhancement layer. By using CBS, we can efficiently encode the ALL-ZERO symbols that are generated by applying the SE. It Is shown by simulation that the proposed RSE can provide a good visual quality for the selected rectangular region with significantly reduced overhead bits.

Development of RF system for Automatic Container Terminal (한국형 컨테이너 터미널 자동화를 위한 RF 시스템 개발)

  • 윤현성;이창호;변건식
    • Proceedings of the Korea Institute of Convergence Signal Processing
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    • pp.41-44
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    • 2000
  • In this paper, the dedicated short range communication(DSRC) system which used as the automatic gate system(AGS) Donga Univ. RRC developed is applied to yard automation. We proposed the communication algorithm of between roadside equipment(RSE) and on-board equipment(OBE). We analyzed transmitted and received information, classification and feature of between OBE and RSE for automation of the container yard and unloading system.

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