• Journal of Korean Society of Transportation
• /
• v.16 no.4
• /
• pp.127-138
• /
• 1998

본 논문에서는 기존의 교통정보 시스템의 단점을 보완하는 중앙집중형 교통정보 시스템의 구축에 관하여 설명한다. 이 시스템은 중앙의 교통정보센터에서 전자지도 및 교통정보를 관리한다. 따라서, 사용자는 전자지도 및 교통정보 갱신의 필요가 없어지며, 교통정보 수신장치를 통해서 경로 정보를 원하는 시기에 제공받는다. 교통정보 수신장치는, 휴대용 노트북과 개인휴대 통신기기인 Cellular Phone이나 PCS Phone이 결합된 형태로 구현함으로서 대중적으로 널리 보급될 수 있는 교통정보시스템을 구축한다. 본 논문에서는 정확한 교통정보의 생성을 위하여 실시간 교통정보를 저장하는 새로운 교통데이터베이스의 구조를 제시하고 직진,우회전,좌회전,유턴 차량의 흐름을 모두 표현할 수 있는 새로운 교통 네트워크 모델을 제시한다. 많은 수의 노드와 아크로 이루어진 교통 네트워크 내에서, 경로계획 시간이 길어지는 문제 해결 방법으로 전체를 여러 개의 지역으로 나누는 방법을 제시하고, 각 지역 내의 경로계획에는 교통데이터베이스를 참조하는 Dijkstra 알고리즘을 사용한다.

• International Journal of Highway Engineering
• /
• v.16 no.2
• /
• pp.119-129
• /
• 2014

PURPOSES : The purpose of this study is to develop the U-turn accident model at 4-legged signalized intersections in urban areas. METHODS : In order to analyze the characteristics of the accidents which are associated with U-turn operation at 4-legged signalized intersections in urban areas and develop an U-turn accident model by regression analysis, the tests of overdispersion and zero-inflation are conducted about the dependent variables of number of accidents and EPDO (Equivalent Property Damage Only). RESULTS : As their results, the Poisson model fits best for number of accident and the ZIP (Zero Inflated Poisson) fits best for EPOD, the variables of conflict traffic, width of opposing road, traffic passing speed are adopted as independent variable for both models. The variables of number of bus berths and rate of U-turn signal time at which the U-turn is permitted are adopted as independent variable only for EPDO. CONCLUSIONS : These study results suggest that U-turn would be permitted at the intersection where the width of opposing road is wider than 11.9 meters, the passing vehicle speed is not high and U-turn operation is not hindered by the buses stopping at bus stops.

• Journal of Korean Academy of Nursing
• /
• v.45 no.3
• /
• pp.347-356
• /
• 2015

Purpose: In this study, the effectiveness of a motivational interviewing smoking cessation YOU-TURN program for adolescents was examined. The program was based on the self-determination theory. Methods: The study was carried out with a nonequivalent control group pretest-posttest design. Participants in the present study were 136 high school students living in D city. The students were assigned to the experimental group (n=52) who participated in the motivational interviewing smoking cessation YOU-TURN program based on self-determination theory, or to the control group (n=84) who participated in a general smoking cessation program. Data were collected from September 1, 2013 through April 30, 2014. Collected data were analyzed using SPSS PC+ 21.0 with Chi-square test, Fisher's exact test, t-test, Mann-Whitney U test, Repeated Measures ANOVA, and MANOVA-Wilk's Lambda. Results: The experimental group had a significant increase in basic psychological needs, and duration of quitting-smoking in comparison with the control group. The experimental group had a significant decrease in cigarettes smoked per day and cotinine in urine in comparison with the control group. Conclusion: The motivational interviewing YOU-TURN program, when delivered to adolescents who smoked, was effective in discouraging smoking, and can be utilized as an effective nursing intervention for adolescents who smoke.

• Journal of Korean Society of Transportation
• /
• v.27 no.3
• /
• pp.39-47
• /
• 2009

Currently, the minimum breadth as a point available for U-turn setup is designated as "over 9m for one way" in the traffic safety facilities practical manuals, and vehicles allowed to make a U-turn are limited to passenger cars. However, as passenger cars have recently become larger and SUVs (Sports Utility Vehicles) are being popularized, they fail to make a U-turn in one attempt. This causes a traffic jam and a problem with traffic safety. This study proposed, compared, and tested the measured values of actual differences in the turning radius of U-turn by actual cars with estimated values by using PC-Crash, a car accident simulation program. Then, the study forecasted the turning radius of U-turns of Korean passenger cars by using PC-Crash, and proposed appropriate breadth for U-turn setup.

• Korean Journal of Air-Conditioning and Refrigeration Engineering
• /
• v.11 no.4
• /
• pp.472-483
• /
• 1999

The evaporation heat transfer and pressure drop characteristics for HFC-l34a in flat plate type heat exchangers with enhanced beads were experimentally investigated. Three plate type evaporators with different geometric condition of U-turn area were tested. Mass fluxes were tested over the range of 83kg/$m^2$s to 166kg/$m^2$s, and heat fluxes were varied from 4㎾/$m^2$ to 12㎾/$m^2$. Evaporation temperature was 5$^{\circ}C$ with inlet qualities of 0.1 to 1.0. There was no notable difference in the heat transfer coefficient by geometric variation of U-turn area, but the third plate with cross-ribbed channel at U-turn area was better than others in the evaluation using volume goodness factor comparison. Also, the mixtures of HFC-l34a and PAG oil was tested to determine oil effects on heat transfer and pressure drop. As oil concentration was increased, heat transfer coefficient was increased by 22~48% up to the 3wt.%, but decreased by 14~22% at the 4wt.%. The pressure drop was increased by the maximum of 100% as oil concentration was increased.

• The Optical Journal
• /
• s.149
• /
• pp.65-72
• /
• 2014

중소기업청이 '2014년도 중소기업 정책자금 운용계획'을 발표했다. 올해 정책자금 예산규모는 3조 8200억 원으로, 지난해의 예산규모(3조 8500억 원) 대비 소폭 줄었다. 중소기업의 투자촉진을 위한 시설투자 자금인 신성장자금이 전년 대비 2000억 원 확대된 8350억 원이 배정됐다. 청년창업활성화를 위한 청년창업전용자금과 재기 중소기업인을 위한 재창업자금 규모도 각각 1500억 원, 500억 원으로 전년 대비 170억 원, 100억 원 늘었다. 일자리 창출기업에 대한 우대금리도 확대했다. 기존에는 지원업체 중 추가 고용 1인당 0.1%포인트씩 최대 1.0%포인트 금리를 인하했지만, 올해는 금리 인하 한도를 2.0%포인트까지 늘렸다. 10명 이상 고용을 창출한 기업은 개별기업 융자한도(45억원)에 예외를 적용해 70억 원까지 대출 가능하다. 창업촉진을 위해 창업자금 지원기업의 업력을 기존 5년에서 7년으로 확대하고, 청년전용 창업자금의 대출기간을 3년에서 5년으로 연장했다. 창업자금의 가산금리 조건부 연대보증 면제 대상 조건도 기존 기업평가등급 4등급 이상에서 5등급 이상으로 완화했다. 또한 중소기업 성장사다리 구축을 위해 기술 사업성 우수기업의 장기 시설투자지원 전용자금을 신설, 중소기업진흥공단의 기업평가 우수기업에게 만기 15년 이내의 장기대출을 지원한다. 글로벌 성장사다리 선정기업에 대해서는 수출금융지원자금 대출 한도를 기존 10억 원에서 30억 원까지 확대한다. 이밖에도 소상공인을 위한 소공인특화자금의 시설자금 대출기간을 5년에서 8년으로 연장하고, 유턴기업의 사업장 신 증설 등을 위한 융자금을 최대 70억원까지 지원한다. 중기청 소관 R&D사업 성공기업을 위한 전용자금을 500억원 규모로 운용해 R&D 기업의 성공률을 제고하기로 했다. 올해 정책자금 금리는 민간 금융권의 저금리 기조를 고려, 1분기 정책자금 기준금리를 전 분기(3.57%) 보다 낮은 3.29%로 운영하기로 했다. 또 중소기업인들이 정책자금 신청 등에 어려움이 있었다는 지적에 따라, 올해부터 매월 1일부터 20일까지 중진공 홈페이지(www.sbc.or.kr)를 통해 온라인으로 신청받기로 했다. 제3자의 도움 없이도 손쉽게 자금을 이용할 수 있도록 신청서류를 간소화하고, 중진공 각 지역본(지부)에 융자신청 도우미를 배치할 방침이다.

• The Journal of The Korea Institute of Intelligent Transport Systems
• /
• v.15 no.6
• /
• pp.80-89
• /
• 2016

The median exclusive bus lanes with the purpose of improving public transport as part of a public transport promoting policy propel to improves the speed of the bus and guarantee punctuality security of public transportation for citizen satisfaction. In Median Exclusive bus lanes, Intersection operational methods are classified as turn prohibition, left turn, left turn U-Turn after turn prohibition. However, there are not clear criteria for applying for turn left U-Turn and related researches. The purpose of this study is to search a method for more safely operation when we operate turn left U-Turn in median exclusive bus lanes intersection. As a result, Bus stop in median exclusive bus lane should set back 12m for left turn, 17m for left turn U-turn during 60km/h and set back 13m for left turn, 17m for left turn U-turn during 50km/h.

• KSCE Journal of Civil and Environmental Engineering Research
• /
• v.39 no.6
• /
• pp.869-875
• /
• 2019

The service level of the roundabout is estimated through an analytic model using the geometrical characteristics and parameter values obtained from the observations. Although a lot of researches have been conducted on the rotational intersection through an analytical model, the case of variable combinations is enormous, suggesting the range and service level of appropriate traffic volume according to the case study or limited characteristics through simulation. Therefore, in this study, the roundabout analysis model was constructed by using Visual Basic Application to make variable adjustment more easily. The constructed model analyzes traffic conditions according to various situations and analyzes the characteristics of roundabouts. As the result of analysis, the more the ratio of left turn and U-turn, the more the traffic distribution of each approached road was biased to one side, the limit traffic volume of the roundabout decreased and congestion appeared quickly. In particular, the more uneven the distribution of traffic was, the less the Saturation traffic volume was affected by the turnover rate.

• Journal of the Korea Institute of Information and Communication Engineering
• /
• v.17 no.11
• /
• pp.2575-2580
• /
• 2013

In this paper, we watch out key measure of the level of transportation service about travel time and delay time. And we measured vehicle traffic by moving vehicle method using CCTV which is one of the travel time measure. We should be measured in place of continuous traffic flow characteristics with wide traffic light interval. In addition, traffic flow on the other side of the interval must be sufficiently identifiable and at the end of this section must be possible U-turn. This method it requires only the driver of the vehicle because of the CCTV measure. In addition, We cannot require time, distance, and traffic equipment that can be recorded. Because equipped with the software to do that. In addition to traffic, average travel time, average space speed, traffic density are also available.

• Journal of Korean Society of Transportation
• /
• v.20 no.1
• /
• pp.77-90
• /
• 2002

Network expansion has been an inevitable method for most traffic equilibrium assignments to consider intersection movements such as intersection delays. The drawback of network expansion is that because it dramatically increases network sizes to emulate possible directional movements as corresponding links, not only is complexities for building network amplified, but computational performance is shrunk. This paper Proposes a new variational inequality formulation for a user-optimal traffic equilibrium assignment model to explicitly consider directional delays without building expanded network structures. In the formulation, directional delay functions are directly embedded into the objective function, thus any modification of networks is not required. By applying a vine-based shortest Path algorithm into the diagonalization algorithm to solve the problem, it is additionally demonstrated that various loop-related movements such as U-Turn, P-Turn, etc., which are frequently witnessed near urban intersections, can also be imitated by blocking some turning movements of intersections. The proposed formulation expects to augment computational performance through reduction of network-building complexities.