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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of Korean Society of Transportation
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Journal DOI :
Korean Society of Transportation
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Volume & Issues
Volume 1, Issue 1 - Apr 1983
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A Overview and Effectiveness of the Computer Controlled Traffic Signal system at Seoul
Journal of Korean Society of Transportation, volume 1, issue 1, 1983, Pages 10~27
In order to improve the traffic enviroments in the urban streets of Seoul, the computer controlled traffic signal system was installed on 45 intersections at 1980. Afterward, yearly expansion was done to the numbers of 132 intersections and 232 loop detectors. The problems of timing plans were discussed, mainly pedestrian crossing timing as well as the generations of split and offset. The broad urban streets more than 30m require long phasing time of pedestrians, even though the equivalent or correspondent traffic volume is rare. The configuration of computer system for traffic control was disscussed in terms of control strategy. An overview also given. The improvements were measured at every quater. The travel speed improved to 42%, delay time reduced to 41% and number of stops to 43% respectively.
Toward the Efficient Integration of Travel Demand Analysis with Transportation Network Design Models
Journal of Korean Society of Transportation, volume 1, issue 1, 1983, Pages 28~42
In recent years, significant advances have been made enabling travel demand analysis and network design methods to be used as increasingly realistic evaluation tools. What has been lacking is the integration of travel demand analysis with network design models. This paper reviews some of advanced (integrated) modeling approaches and presents future research directions of integrated modeling system. To design urban transportation networks, it is argued that the travelers' free choice of mode, destination and route should be introduced into transportation network design procedure instead of assuming that trips from a zone to a workplace are fixed or deriving them in a normative procedure to achieve hypothetical system optima.
Validity of Gravity Models for Individual Choies
Journal of Korean Society of Transportation, volume 1, issue 1, 1983, Pages 43~47
Within the conventional transportation planning process, "trip distribution" has a significant role to play. The most widely applied trip distribution model is the gravity model, for which Wilson provided the theoretical basis in 1967. The concept of the gravity model, however, still remains ambiguous if we analyze the "trip distribution" with a disaggregate data set. Thus, this paper hypothesizes that the gravity technique is still valid even with the disaggregate data set, by proving that the estimated coefficients of the gravity model, which is derived under the principle of entropy maximization, are identical with those of the multinomial logit model, which is derived under the principle of individual utility maximization.tility maximization.
On the Large Area Multi Modal Network Formulation Techniques
Journal of Korean Society of Transportation, volume 1, issue 1, 1983, Pages 48~55
One of the major objectives of a transportation study is to provide the transportation networks for future years in order to accommodate the projected transport demand for the movement of passengers and goods utilizing the optimum "mix" of modes. To achieve this goal, the planning process starts with collection and analysis of data to determine the existing traffic demand and travel pattern, and to assign the future trip interchanges on th existing and planned networks to determine areas of improvements so that it can cope with increasing future traval demand. The purpose of this paper attempts to explain the public transport network formulation techniques which can be easily applied to the large urban area multi modal public transport system.
Estimating Utilization Factor of Left Turn Lane for Through Traffic, Intersection Capacity, and Optimum Signal Timings
Journal of Korean Society of Transportation, volume 1, issue 1, 1983, Pages 56~63
Intersection control has dual-purposes; increasing capacity and reducing delay. The primary concern of efficient intersection control under oversaturated condition as in Korea is to increase capacity. Prevailing intersection operation technique permits thru traffic to utilize left turn lane, because the intersection without left turn pocket has left turn signal interval. In this situation, it seems not to be valid to calculate capacity, delay, and signal timings by conventional methods. By critical lane technique, capacity increases as cycle length increases. However, when thru traffic utilize LT lane, the capacity varies according to LT volume, LT interval as well as cycle length, which implies that specific cycle length and LT interval exist to maximize capacity for given LT volume. The study is designed is designed to calculate utilization factors of LT lane for thru traffic and capacities, and identify signal timings to yield maximum capacity. The experimental design involved has 3 variables; 1)LT volumes at each approach(20-300 vph), 2)cycle lengths (60-220 sec), and 3)LT intervals(2.6-42 sec) for one scenario of isolated intersection crossing two 6-lanes streets. For LT volume of 50-150 vph, capacity calculated by using the utilization factor is about 25% higher than that by critical lane method. The range of optimum cycle length to yield maximum capapcity for LT volume less than 120 vph is 140-180 sec, and increases as LT volume increases. The optimum LT interval to yield maximum capacity is longer than the intrval necessary to accommodate LT volume at saturation flow rate.
An Assessment of Trip-maker's Behavior Under Uncertainty for Value of Travel Time
Journal of Korean Society of Transportation, volume 1, issue 1, 1983, Pages 64~81
AN EMPIRICAL TEST OF THE BLENDING LOGIT MODEL
Journal of Korean Society of Transportation, volume 1, issue 1, 1983, Pages 82~103
A Case Study of Generating and Evaluating Subway Network Alternatives
Journal of Korean Society of Transportation, volume 1, issue 1, 1983, Pages 104~120
Alternative generation and evaluation in the transportation planning process are generally considered the two most important areas of research. It is, however, unfortunate that most of Korean transportation network systems are evolved without thorough investigation of alternatives and that underplanned systems as well as over-planned systems ar blamed for the current transportation problems. This paper investigates the practical use of formal methodology of alternative generation and evaluation. The maximum possible alternative network approach and the computer oriented network evaluation method developed by KIST and applied for Pusan subway study are summarized to demonstrate their practical usefulness. The practical problems centering around the quantification of evaluation criteria ar also summarized for further studies.