• Title/Summary/Keyword: Yellow Time Interval

Search Result 22, Processing Time 0.022 seconds

A Study on Dilemma Zone Safety Improvement using Drone Videos (드론을 이용한 교차로 딜레마구간 안전개선에 관한 연구)

  • Lee, Si-Bok
    • The Journal of The Korea Institute of Intelligent Transport Systems
    • /
    • v.16 no.4
    • /
    • pp.122-131
    • /
    • 2017
  • This study was a drone-utilized case study motivated by that drones can obtain sophisticated video image data previously not feasible. The dilemma zones on selected intersection approaches were identified and locations of drivers' decision making to stop or go at the onset of yellow were determined by analyzing drone video images. The gap between the drivers' decision making location and invisible stop/go border line provided by the yellow time interval was defined as "risky passing zone". To improve the dilemma zone safety problems, re-optimization of yellow time intervals and introduction of new pavement marking that can help drivers decision making on yellow indication are suggested.

Application of a Large Ocean Observation Buoy in the Middle Area of the Yellow Sea (황해중부해역에서의 대형 해양관측부이의 운용)

  • Shim, Jae-Seol;Lee, Dong-Young;Kim, Sun-Jeong;Min, In-Ki;Jeong, Jin-Yong
    • Ocean and Polar Research
    • /
    • v.31 no.4
    • /
    • pp.401-414
    • /
    • 2009
  • Yellow Sea Buoy (YSB) was moored in the center of the Yellow Sea at 35$^{\circ}$51'36"N, 124$^{\circ}$34'42"E, on 12 September 2007. YSB is a large buoy of 10 m diameter, and as such is more durable against collision by ships and less likely to be lost or removed by fishing nets compared to small ordinary buoys of 2.3 m diameter. YSB is equipped with 12 kinds of oceanic and meteorologic instruments, and transfers its realtime observation data to KORDI through ORBCOMM system every 1 hour. Data on ocean winds, air temperature, air pressure, and sea temperature appear to be accurate, while water property sensors (AAQ1183), which are sensitive to fouling, are producing errors. YSB (2007), Ieodo ocean research station (2003), and Gageocho ocean research station, which was completed in October 2009, will establish the 2 degrees interval by latitude in the Yellow Sea, and they will contribute though the 'Operational Oceanography System' as the important realtime observation network.

Numerical study on temporal resolution of meteorological information for prediction of Asian dust (황사의 확산예측을 위한 기상정보의 시간해상도에 관한 수치연구)

  • Lee Soon-Hwan;Gwak Eun-Young;Ryu Chan-Su;Moon Yun-Seob
    • Journal of Environmental Science International
    • /
    • v.13 no.10
    • /
    • pp.891-902
    • /
    • 2004
  • In order to predict air pollution and Yellow-sand dispersion precisely, it is necessary to clarify the sensitivity of meteorological field input interval. Therefore numerical experiment by atmospheric dynamic model(RAMS) and atmospheric dispersion model(PDAS) was performed for evaluating the effect of temporal and spatial resolution of meteorological data on particle dispersion. The results are as follows: 1) Base on the result of RAMS simulation, surface wind direction and speed can either synchronize upper wind or not. If surface wind and upper wind do not synchronize, precise prediction of Yellow-sand dispersion is strongly associated with upwelling process of sand of particle. 2) There is no significant discrepance in distribution of particle under usage of difference temporal resolution of meteorological information at early time of simulation, but the difference of distribution of particles become large as time goes by. 3) There is little difference between calculated particles distributions in dispersion experiments with high temporal resolution of meteorological data. On the other hand, low resolution of meteorological data occur the quantitative difference of particle density and there is strong tendency to the quantitative difference.

Realtime Tide and Storm-Surge Computations for the Yellow Sea Using the Parallel Finite Element Model (병렬 유한요소 모형을 이용한 황해의 실시간 조석 및 태풍해일 산정)

  • Byun, Sang-Shin;Choi, Byung-Ho;Kim, Kyeong-Ok
    • Journal of the Korea Institute of Military Science and Technology
    • /
    • v.12 no.1
    • /
    • pp.29-36
    • /
    • 2009
  • Realtime tide and storm-surge computations for the Yellow Sea were conducted using the Parallel Finite Element Model. For these computations a high resolution grid system was constructed with a minimum node interval of loom in Gyeonggi Bay. In the modeling, eight main tidal constituents were analyzed and their results agreed well with the observed data. The realtime tide computation with the eight main tidal constituents and the storm-surge simulation for Typhoon Sarah(1959) were also conducted using parallel computing system of MPI-based LINUX clusters. The result showed a good performance in simulating Typhoon Sarah and reducing the computation time.

A Study for Minimum Requirements Time of Bicycle Signal Clearance Interval (자전거 신호등의 신호변환시간 산출에 관한 연구)

  • Joo, Doo-Hwan;Yeo, Woon-Woong;Hyun, Cheol-Seung;Park, Boo-Hee;Lee, Choul-Ki;Ha, Dong-Ik
    • The Journal of The Korea Institute of Intelligent Transport Systems
    • /
    • v.9 no.5
    • /
    • pp.59-66
    • /
    • 2010
  • Korea have experienced a very rapid increase in police-reported collisions between bicycle and motor vehicles over the past decade. Even though cycling accidents are increasing, efforts to make urban areas more accomodating to cyclists are seldom formed. Clearance intervals(including both the yellow change and all-red clearance intervals) at signalized intersections that are of inadequate lengths for bicycles may cause accidents. Data on bicycling speed, acceleration and deceleration were tested and analyzed on the flat. Using the results of the analysis and based on the AASHTO's equation of the bicycle clearance interval, a methodology is got for calculation safe clearance intervals for bicycle riders. The clearance interval call for bicycles will be larger or same than for vehicles because of the speed, acceleration and deceleration difference. Adequate bicycle speed, acceleration and deceleration for korean bicycle users is presented in this paper. It is hoped that traffic engineers to provide safe intersection clearance time for bicycles use the results of this paper.

A Study on Driver Behavior and Dilemma Zone during Yellow Interval at Signalized Intersections (신호교차로 황색현시에서의 운전자 형태 및 딜레마 구간 연구방안)

  • 이승환;이성호;박주남
    • Journal of Korean Society of Transportation
    • /
    • v.21 no.4
    • /
    • pp.7-16
    • /
    • 2003
  • Objective of this research is to analyze drivers' behaviors at signalized intersection during yellow interval. For this, deceleration rate of stopping, PRT(Perception-Response Time), and the relationship between dilemma zone and deceleration rate of stopping were surveyed at two signalized intersections located at urban area(Songtan and Suwon) and local area(Yongin) As a result, the deceleration rate of stopping at signalized intersections and a range of dilemma zone were estimated. It was found that the deceleration rate of stopping and PRT were 1.6m/sec$^2$ and 1.27sec, respectively. These values are bigger than ITE's values which have been used in our country. Accordingly, it is considered that these values should be used as a new design criteria for the traffic signal control.

Effect of All-Red Clearance Interval on Intersection Right-Angle Crashes (전적색신호가 교차로 직각충돌사고에 미치는 영향)

  • Kim, Yong-Seok;Gang, Dong-Su;Park, Jun-Tae;Lee, Su-Beom
    • Journal of Korean Society of Transportation
    • /
    • v.28 no.1
    • /
    • pp.97-105
    • /
    • 2010
  • An All-red clearance interval(AR) has been operating with amber signal in order to avoid collision between vehicles which cannot come out of the intersections, vehicles coming in from the opposite direction, and pedestrians(bicycles) on the crosswalk during the signal conversion time at the intersections. Foreign nations have been analyzing AR's influences of traffic accidents. On the other hand, the similar research has not been conducted in the country. The objective of this paper, therefore, is to analyze the safety at the intersections with respect to the installation of AR through the hypothesis test. A before-and-after analysis has been performed for 10 intersections where applied AR. From the 95% of significance level, the results of Non-parametric Test show that the installation of AR improves a safety at the intersections. The results indicates that AR discharges vehicles passing through the intersections and control entering vehicles at the intersections.

The CNS Responses of Elderly Driver due to Signal Types at the Intersection: Focused on Yellow Interval Dilemma Situation (교차로 상황에 따른 고령운전자의 중추신경계 반응: 황색신호 딜레마를 중심으로)

  • Lee, Young-Chang;Kim, Bo-Seong;Kim, Hyun-Woo;Lim, Dong-Hoon;Bak, Mi-Seon;Min, Byung-Chan;Min, Yoon-Ki
    • Journal of the Ergonomics Society of Korea
    • /
    • v.29 no.5
    • /
    • pp.783-788
    • /
    • 2010
  • This study was to examine to the CNS(Central Nervous System) responses of elderly drivers at the green, yellow, and red signal types. To examine this result, the older adults over age 65 who has more than 5 years of driving experience participated this experiment. In addition, we used audio-visual film clips as the stimulus than driving simulator, because the CNS reponses are sensitive to movement such as steering wheel. While subjects were watching one car's driving among green, yellow, or red signal types at the intersection, we measured their EEG(electroencephalogram) using monopolar electrodes from Fz, Cz and Pz sites. As a result, relative sizes of beta waves were changed due to the signal type conditions, and pre- and post-time of entering the intersection at the measured sites, separately. It suggests that the elderly drivers' CNS responses were different by the signal types.

INFLUENCE OF HARVEST TIME ON CHARACTERISTICS OF AROMATIC-TYPE TOBACCO (향끽미종 연초의 수확시기가 건조엽의 특성에 미치는 영향)

  • 류명현;김용옥;정형진;김신일;손현주;추홍구
    • Journal of the Korean Society of Tobacco Science
    • /
    • v.7 no.1
    • /
    • pp.39-47
    • /
    • 1985
  • Normally cultured aromatic tobaccos, KA 101 and KA 103, were primed progressively in three-leaf segments, either 7 days before bud, bud, or early flower stage with 7 days interval, respectively, The cured leaves were weighed for yield, graded, analyzed for quality-related constituents including volatile aroma components. Also the cured leaves were manufactured and smoked by panelists. Yield and quality by price decreased with advancing ripeness. Reducing sugar, total nitrogen, protein nitrogen decreased with successive ripeness, but reverse in this trends with nicotine, petroleum ether extracts and volatile acids components. Among volatile neutral components, furfural, furfuryl alcohol, benzyl alcohol, penethyl alcohol and p-cresol decreased, but solanone increased with delayed harvest. Neophytadiene, oxysolanone, furfuryl aceton was highest at mid harvest, which was judged to be best by panelists. Mid harvest, first primed at bud stage when leaf color comes to pale green to yellow green, seems to be highly recommendable.

  • PDF

STUDIES ON THE CHLORINE OF BURLEY TOBACCO PLANTS. IV. THE EFFECTS OF APPLICATION TIME AND RATE OF CHLORINE ON THE CHLORINE ABSORPTION AND DISTRIBUTION IN EACH STALK POSITION OF THE PLANTS (버어리종 담배의 염소에 관한 연구 IV. 염소시용시기 및 시용량이 담배의 염소흡수 및 엽중분포에 미치는 영향)

  • 김상범;배길관
    • Journal of the Korean Society of Tobacco Science
    • /
    • v.9 no.2
    • /
    • pp.25-35
    • /
    • 1987
  • Effects of application time And rate of chlorine on the chlorine absorption and distribution at different stalk positions of the plants were Investigated in burley tobacco grown under the pot condition. Treatment consisted of 6 application times (from 2 weeks before transplanting to 8 weeks after transplanting with 2 weeks' interval) and 2 application rates (2g and 4g-KCl/pot) by 6X2 factorial experimental design. The tobacco plants took up the chlorine rapidly just after chlorine application, and the chlorine content of leaf was increased proportionally to the rate of chlorine application. The chlorine was accumulated when much in lower leaves when chlorine was applied early, while the chlorine accumulated much in upper leaves when chlorine was applied late. The chlorine content of leaf was negatively correlated to the degree of brightness, red color and yellow color of cured leaf. Significant Increases In cured leaf ratio, leaf thickness, leaf weight and weight Per unit leaf area of harvested leaf were obtained with increased chlorine application. When the chlorine was applied early, the leaf weight showed Increasing tendency.

  • PDF