PURPOSES : This study aims to suggest how to utilize "standby data" of shared mobility that does not contain personal information and examine whether "standby data" can derive existing shared mobility operation analysis items similarly. METHODS : An existing Personal Mobility (PM) traffic pattern analysis was performed by identifying the user (User ID) and the user's route in a time frame. In this study, the PM traffic pattern analysis focuses on a vehicle (ID of the standby vehicle) and its standby location. We examined whether the items derived from the User ID-based traffic pattern analysis could also be derived from the standby Vehicle ID-based analysis. RESULTS : The analysis showed that all five items (traffic volume by time slot, peak time, average travel time, average travel distance, and average travel speed) of the existing User ID-based PM travel analysis result could be derived similarly using the standby Vehicle ID-based PM traffic analysis. However, the disadvantage is that the average driving distance is calculated as a straight-line distance. It seems possible to overcome this limitation by correcting the average driving distance through linkage analysis with road network data. However, it is not possible to derive the instantaneous maximum speed or acceleration/deceleration. CONCLUSIONS : In an era in which various means of transportation are being introduced, data sharing is not preferred because of legal issues.Consequently, it is difficult to understand the use of new means of transportation and formulate new policies. To address this, data sharing can be active based on standby data that is not related to personal information.

PURPOSES : This study proposes a method for comparative analysis, based on geographic information systems (GIS), that can be used when introducing demand-responsive transit in areas where public transportation is not available. METHODS : To analyze areas where public transportation is neglected, bus stop location information, building location information, and administrative district boundary data for the census were acquired. Geocoding was used for address-based raw data to create a spatial database. Based on the collected data, the proportion of households separated by a certain minimum distance from a bus stop was aggregated and constructed through near analysis. When introducing a demand-responsive transit system, the operational cost was calculated and compared with the existing city bus transportation cost. RESULTS : Results show that the operating costs of introducing demand-responsive transit can be compared and analyzed using the proposed method, for a case study of Daejeon Metropolitan City. CONCLUSIONS : It is economically efficient to avoid the entry of route buses and introduce demand-responsive transit in areas isolated from public transportation where the number of people getting on and off is extremely low.

PURPOSES : In this study, the installation standards for micro-roundabouts at the intersection of local streets with two entering lanes of a 3.0 m lane width were developed. METHODS : The inscribed circle diameter where a design standard vehicle could turn around safely based on the lane width and speed was analyzed using AutoTURN software. A total of 864 analysis scenarios for different entering volume and left-turning ratio (10%, 20%, 30%, and 40%), intersection type (three-way and four-way), heavy vehicle ratio (0%, 5%, and 10%), and circle lane turning speed (10, 15, and 20 km/h) conditions were established and evaluated. VISSIM Micro-Simulation was used to estimate the entering volume for microroundabouts with LOS C. RESULTS : The results showed that the estimated entering volumes of the three-way and four-way micro-roundabouts with LOS C were 300~400 and 200~400 vehicle/hour/lane, respectively. CONCLUSIONS : It is demonstrated that the standard volume of entering vehicles for micro-roundabouts is approximately 200 vehicle/ hour/lane, considering the number of approach lanes, designed speed of circulating lanes, left turn ratio, and heavy vehicle ratio.

PURPOSES : In this study, the causality between smart parking user services and its satisfaction level was analyzed statistically, and a smart parking priority decision model was established in terms of the user side. METHODS :The results of the Daegu Metropolitan City survey for the parking state, parking fee, transfer, convenience of use, facilities, and safety that could influence smart parking user satisfaction were used. A structural equation model in SPSS 26 and AMOS 26 programs that facilitates hypothesis testing and importance factor analysis between observed and latent variables was used. RESULTS : The results demonstrated that the importance factor loading on smart parking user services was in the following order: convenience of use (0.996), parking facilities (0.814), safety (0.803), parking information (0.706), transfer (0.618), and parking fee (0.426). Among them, the parking fee was not quite influential in decision making. CONCLUSIONS : The most influential user service on smart parking information systems was the convenience of use, in which congestion in parking lots and parking time were the most influential variables. The most influential variables were in the following order: in parking facilities, the route design of vehicle flow and size of the parking garage; in safety, the entrance location and the level of wear; in the parking state, the availability of parking space and parking fees; and finally in transfer, the convenience of transfer to other modes and the number of transfer parking lots.

아연(zinc) 분말은 철의 부식을 막아주는 희생양극의 기능으로 자동차, 선박 및 철구조물의 부식을 방지하 는데 널리 사용되고 있다. 그러나 아연 분말은 높은 비중 때문에 수지나 용매 내에서 분산성이 저하되고 빠르게 침전이 일어나는 단점을 가진다. 본 연구에서는 실리카(SiOx)를 미세 아연분말의 표면에 코팅함으로써 아연분말의 물성 및 기능을 개선하고자 하였다. 아연분말의 실리카 표면코팅은 졸-겔법을 사용하였고 SEM/EDS의 표면 및 성분분석과 TEM 단면분석을 통하여 불순물이 잔존하지 않는 실리카 코팅이 성공적으로 형성됨과 그 코팅의 두께를 확인 할 수 있었다. 한편 코팅공정의 반복회수와 평균입도 변화와의 관계를 측정하여 2회까지의 반복코팅이 분산안정성을 유지하는데 효과적임을 확인하였다. 이 밖에 실리카 코팅 아연분말의 진비중(true density) 측정을 통해 코팅 공정에 의해 비중이 20% 이상 감소함을 확인하였고 제타포텐셜 측정으로 실리카 코팅에 의해 아연분말의 분산안정성이 4배까지 증가함을 확인하였다. 마지막으로 질산수용액 담지를 통해 실리카 코팅 아연분말의 내산성 향상 또한 확인하였다. 따라서 본 연구에서 제조된 실리카 코팅 아연분말은 방청 안료의 원료로 적합할 것으로 기대된다.

PURPOSES : Under the capacity conditions with balanced approach flows, roundabouts give less delay than existing signalized intersections; however, flows over 450 vehicles/hour/lane with unbalanced approach flow conditions, roundabouts efficiency drops due to the short time difference between the critical gap and the follow-up headway. The purpose of this study is developing a roundabout Signal Metering operation method by considering approach lanes degree of saturation. METHODS : A four-way-approach with one-lane roundabout is selected to compare the Signal Metering performance for the case of 16 different unbalanced flow conditions. Based on these traffic conditions, the performance is evaluated for 64 different cases of Signal Metering combinations by using SIDRA software. A degree of saturation(V/C ratio) sum for two adjoined approaches is used for the performance index of choosing Metered Approach and Controlling Approach. RESULTS : When the V/C ratio sum is 0.29~0.81 and Metered Approach flow is less than Controlling Approach flow, the average delay saving per vehicle is about 7 seconds; however, after this rage the delay saving decreases gradually until the V/C ratio sum reaches around 1.0. The range of V/C ratio sum 0.93~1.09 provides average delay saving per vehicle about 3 seconds. In case of V/C ratio sum is grater than 1.0 and the flows of Metered Approach is grater than Controlling Approach, the average delay per vehicle increases 3~11 times respectively. CONCLUSIONS : As expected, the Signal Metering provides substantial improvements in delay saving for the case of V/C ratio sum is 0.3~1.0 under the traffic flow conditions of Metered Approach is less than Controlling Approach.

회전교차로(roundabout)는 용량 이하의 상태에서 접근로별 교통류가 균등할 경우 기존 신호교차로에 비해 운영효율성이 증대되나 토지이용변화로 교통량이 증가하면서 접근로별 교통류가 불균등 해질 경우(차로 당 450대/시 이상) 주접근로에서 회전교차로 내부로의 진입이 어려워져 효율성이 떨어지게 된다. 본 연구에서는 1차로형 4지 회전교차로를 대상으로 회전교차로 설치이후 교통량 증가로 신호교차로 설치에 대한 재검토를 하기 전에 회전교차로를 효율적으로 운영할 수 있는 Signal Metering 전환기준 및 운영방법을 제시하고 효과분석(지체 및 대기행렬)은 SIDRA를 활용하였다. 본 연구결과 총 진입교통량이 1,800~2,000pcu/시 이고 주접근로의 진입교통량비가 60~70%일 때 지체는 30~40% 그리고 대기행렬은 30~60% 감소하였다. 또한 주접근로에 가장 인접한 부접근로에 Metered Approach를 설치하고 한 쌍(pair)으로 묶어서 운영하는 것이 효과적인 것으로 분석되었다.

현행 주차장법상의 부설주차장 설치기준은 위락시설, 문화 및 집회시설, 단독주택, 공장 등 설치 대상 시설물을 9개 그룹으로 분류하고, 그룹 내 시설물에 대해서는 동일한 설치기준이 제시되어 있다. 지자체는 필요에 따라서 지자체 조례로 시설물의 종류를 세분하거나 설치기준의 2분의 1의 범위(±50%) 안에서 이를 강화 또는 완화할 수 있도록 되어 있다. 최근 건축물의 종류가 다양해지고 기능이 혼재되어 같은 그룹에 속하더라도 시설물에 따라 주차장설치기준을 세분화할 필요가 있으나, 대부분 지자체의 경우 체계적이고 일관된 기준 없이 주차장법에서 제시된 시설분류기준에 강화된 획일적인 설치기준을 조례에 적용하고 있다. 특히, 산업단지 내 위치한 대규모 첨단제조시설의 경우 공정이 자동화되어 건물규모대비 근무인력이 소수임에도 불구하고 이에 대한 별도의 세부적인 구분없이 기타시설 또는 공장시설로 분류되어 일반 제조공장과 동일한 일괄적 기준을 적용하고 있다. 따라서 본 연구에서는 현장조사를 통해 산업단지 내 공장시설에 대한 기존 주차원단위 산정에 대한 문제점을 분석하고, 이를 해결하기 위해 방안으로 용도 및 규모특성을 고려한 부설주차장 설치기준 개선방안을 제시하였다.

신호교차로의 교통류 해석을 위해 널리 사용되는 선형모형(Vertical queueing model)은 자유속도에 따라 모든 차량이 정지선에 도착하고, 대기행렬은 정지선에서 수직으로 형성된다고 가정한다. 이러한 모형자체의 단순성 때문에 선두차량은 자유속도와 가속도에 의해 계산된 출발유효녹색시간(start of effective green time)에 정지선을 통과하게 되며, 모든 추종차량은 동일한 궤적을 갖게 된다고 가정한다. 본 연구의 목적은 Vertical queueing 모형의 단순성과 비현실성을 보완하기 위해 물리학의 Kinematic수식을 응용하여 신호교차로의 출발녹색시간(start of green time)을 함수로 한 자동차추종모형(Kinematic Car-following model at Signalized intersections: KCS traffic model)을 개발하고, 이에 따른 지체 및 지체민감도를 비교함에 있다. 출발녹색시간 변화에 따른 지체분석결과 Vertical queueing 모형에서 산출된 지체값이 KCS 교통류모형에 비해 과다하게 추정됨을 알 수 있었다. 반면, 지체민감도 분석 결과 KCS 교통류모형이 Vertical queueing 모형에 비해 민감하게 변함을 알 수 있었다.