• Title/Summary/Keyword: 안전성 평가지표

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A Methodology for Evaluating Vehicle Driving Safety based on the Analysis of Interactions With Roads and Adjacent Vehicles (도로 및 인접차량과의 상호작용분석을 통한 차량의 주행안전성 평가기법 개발 연구)

  • PARK, Jaehong;OH, Cheol;YUN, Dukgeun
    • Journal of Korean Society of Transportation
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    • v.35 no.2
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    • pp.116-128
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    • 2017
  • Traffic accidents can be defined as a physical collision event of vehicles occurred instantaneously when drivers do not perceive the surrounding vehicles and roadway environments properly. Therefore, detecting the high potential events that cause traffic accidents with monitoring the interactions among the surroundings continuously by driver is the prerequisite for prevention the traffic accidents. For the analysis, basic data were collected to analyze interactions using a test vehicle which is equipped the GPS(Global Positioning System)-IMU(Inertial Measurement Unit), camera, radar and RiDAR. From the collected data, highway geometric information and the surrounding traffic situation were analyzed and then safety evaluation algorithm for driving vehicle was developed. In order to detect a dangerous event of interaction with surrounding vehicles, locations and speed data of surrounding vehicles acquired from the radar sensor were used. Using the collected data, the tangent and curve section were divided and the driving safety evaluation algorithm which is considered the highway geometric characteristic were developed. This study also proposed an algorithm that can assess the possibility of collision against surrounding vehicles considering the characteristics of geometric road structure. The methodology proposed in this study is expected to be utilized in the fields of autonomous vehicles in the future since this methodology can assess the driving safety using collectible data from vehicle's sensors.

Reliability Analysis in Designing of Reinforced Soil Structures using Uni-Modal Bounds (단일모드 구간해법을 이용한 보강토옹벽 설계의 신뢰성해석)

  • Kim, Hyun-Ki;Lee, Sung-Hyouk;Choi, Chan-Yong
    • Journal of the Korean Geosynthetics Society
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    • v.9 no.4
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    • pp.17-25
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    • 2010
  • Evaluation of stability in traditional designing of reinforced soil structures is executed by examination of internal and external stability. Analysis of internal stability is for pull-out and ductile strength. Analysis of external stability is for settlement, overturning and sliding. To minimize inherent uncertainties of soil properties and analytical model, reliability analysis was developed recently. In this study, reliability analysis method considering simultaneous failure probability for various failure mode of internal and external stability is proposed. By applying uni-modal bounds, Stability of system reliability of reinforced soil structures is evaluated by integrating multi failure mode for various analytical model. Because of complex consideration for various failure shapes and modes, it is possible to secure advanced safety by using simultaneous failure probability. And evaluation of reinforced soil structure is executed by representative index, simultaneous failure probability, than previous method.

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A Study on Evaluation of Plan to Improve Cycling Environment (자전거 주행환경 개선방안의 평가에 관한 연구)

  • Hwang, Jung-Hoon;Kim, Kap-Soo
    • Journal of Korean Society of Transportation
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    • v.23 no.8 s.86
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    • pp.203-213
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    • 2005
  • Recently, with the increase of the interest to global environmental problems, bicycle has been recognized as the most environmentally friendly transportation mode. To promote cycling, it is necessary to ensure road space that bicycle can keep running safely and smoothly. This paper aims to evaluate the district with rearranged road space and network, given priority to bicycle, comparing the traditional district which are given priority to car from viewpoints of environment, safety and accessibility. As evaluation indicators, the carbon dioxide emission on the environment. the number of collision between car and bicycle on safety and an accumulated frequency measure on accessibility were used. As the result, it was clarified that bicycle road measures to create bicycle road by reallocation of road space and form bicycle exclusive network were effective.

Integration of Space Syntax Theory and Logit Model for Walkability Evaluation in Urban Pedestrian Networks (도시 보행네트워크의 보행성 평가를 위한 공간구문론과 Logit 모형의 통합방안)

  • Kim, Jong Hyung;Lee, Mee Young
    • The Journal of The Korea Institute of Intelligent Transport Systems
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    • v.15 no.5
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    • pp.62-70
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    • 2016
  • Ensuring walkability in a city where pedestrians and vehicles coexist is an issue of critical importance. The relative relationship between vehicle transit and walkability improvements complicates the evaluation of walkability, which thus necessitates the formation of a quantitative standard by which a methodological measurement of walkability can be achieved inside the pedestrian network. Therefore, a model is determined whereby quantitative indices such as, but not limited to, experiences of accessibility, mobility, and convenience within the network are estimated. This research proposes the integration of space syntax theory and the logit path choice model in the evaluation of walkability. Space syntax theory assesses adequacy of the constructed pedestrian network through calculation of the link integration value, while the logit model estimates its safety, mobility, and accessibility using probability. The advantage of the integrated model hence lies in its ability to sufficiently reflect such evaluation measures as the integration value, mobility convenience, accessibility potential, and safety experienced by the demand in a quantitative manner through probability computation. In this research, the Dial Algorithm is used to arrive at a solution to the logit model. This process requires that the physical distance of the pedestrian network and the perceptive distance of space syntax theory be made equivalent. In this, the research makes use of network expansion to reflect wait times. The evaluation index calculated through the integrated model is reviewed and using the results of this sample network, the applicability of the model is assessed.

A Study on the Establishment and Application of Evaluation Criteria for Old Railway Station Considering the Level of Railway Service (철도 서비스수준을 고려한 노후철도역사 평가기준 마련 및 적용방안)

  • Kim, Kyung Ho;Kim, Si Gon
    • KSCE Journal of Civil and Environmental Engineering Research
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    • v.44 no.1
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    • pp.101-108
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    • 2024
  • The total number of railroad stations managed in Korea is 322 (including general and wide-area railways), and a considerable number of stations are aging. In terms of the size of the existing railway station and the number of entrances, it has not been possible to secure adequate service capacity, and the demand for station improvement is increasing due to changes in surrounding conditions such as urban development. In the past, railroad stations were focused on the simple function of a connection passage in terms of maintenance or management, but in recent years, railroad stations are also changing to an atmosphere that they should be reborn as a user-centered comfortable, convenient, and safe service provision space. In this study, a case study related to the improvement of the old railway station was conducted to derive an improvement plan that meets the improvement standard of the old station, and the service level evaluation standard was developed. By introducing the concept of service level (LOS) in the development model, station congestion, station movement convenience, and station safety were selected as evaluation indicators. In addition, this development model applied an analytical stratification technique to divide various evaluation elements of each indicator into major and detailed elements and derive the relative importance of the elements by class. Priority for improvement was derived using the ratio of the number of E and F on the LOS for each facility. Based on this study, it is expected to be helpful in using it as an evaluation criterion for improving objective and equitable railway station.

A Study on the Development of Smart Water Grid Key Performance Index for the Implementation of Smart City (스마트시티 구현을 위한 스마트워터그리드 성과평가지표 개발에 관한 연구)

  • Jung, Seung Kwon;Jun, Kye Won
    • Journal of Korean Society of Disaster and Security
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    • v.13 no.1
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    • pp.25-39
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    • 2020
  • Despite the global promotion of Smart City, there is currently no standard for smart water grid development, and it is not possible to judge the success of Smart City. There is a clear need to establish the requirements and goals of the Smart Water Grid and accurately diagnose and improve the limitations and problems of the existing Smart Water Grid. For this purpose, it is very important to use the index suitable for Smart Water Grid goals. In this study, we developed Smart Water Grid Index which can be used to evaluate the target measurement and attainment of Smart Water Grid and can be utilized based on the implementation plan for Smart Water Grid in the future. Through the development of the Smart Water Grid Key Performance Index (SWG KPI), we will lay the groundwork for continuous capacity evaluation of the Smart Water Grid and improve the reliability of the Index. It is expected that it will be possible to prepare and evaluate a Challenge Evaluation Card for the planned Smart Water Grid by providing an evaluation table for grid competency evaluation.

A Study on the Factors Affecting the Acceptance of the Safety Speed 5030 Policy (안전속도 5030 정책수용도에 영향을 미치는 요인에 관한 연구)

  • Lee, Hwan Jin;Jung, Hun Young
    • KSCE Journal of Civil and Environmental Engineering Research
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    • v.41 no.5
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    • pp.559-569
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    • 2021
  • In this study, using structural equation modeling, a policy acceptance evaluation model was developed to evaluate the service items of roadsthat affect the acceptance of the Safety Speed 5030 policy. The relationship of influence on policy acceptance was found to be as follows: In the driver group, satisfaction with mobility (0.411), economy (0.217), safety (0.181), and environment (0.089) are in the order of top priority; and in the non-driver group, satisfaction with safety (0.466), mobility (0.223), environment (0.194), and economy (0.111) are in the order of top priority. From these results, in order to increase acceptance of the Safety Speed 5030 policy, it is necessary to differentiate the provision of services according to the characteristics of each road user type. This infers it is important to improve mobility for roads with a high hierarchy mainly used by driver groups, and to improve safety for roads with low hierarchy mainly used by non-driver groups. Therefore, the evaluation model for acceptance of the Safety Speed 5030 policy suggested in this study can be used as basic data for activating the Safety Speed 5030 policy in the future by reflecting the qualitative evaluation of users.

Enhancement of Immune Activities of Fermented Morinda citrifolia L. (Noni) and Six Marker Compounds (노니 지표성분 6종과 발효노니의 면역활성 증진 효과)

  • Choi, Sun-Il;Han, Xionggao;Men, Xiao;Lee, Se-Jeong;Kim, Yong Deok;La, Im-Joung;Seong, Geum-Su;Lee, Ok-Hwan
    • Journal of Food Hygiene and Safety
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    • v.37 no.1
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    • pp.29-37
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    • 2022
  • This study will evaluate the effect of fermented Morinda citrifolia L. extracts and its marker compounds to provide baseline data for utilizing Morinda citrifolia L. as functional health products. Morinda citrifolia L. and six marker compounds were processed on RAW 246.7 macrophage to test for XTT Cytotoxicity, measure Nitric Oxide and Cyokine formation, and analyze the expression of immune marker genes. Furthermore, LPS and fermented red ginseng extract, a common functional ingredient, are used as positive controls. Our results showed that fermented Morinda citrifolia L and six bioactive compounds did not have any cytotoxic effect in all treatment concentrations and groups. Among six bioactive compounds, SCP and ASE confirmed the formation of NO. In addition, the ASE treatment group showed increased formation of IL-6 and IL-1β and the expression of iNOS and TNF-α. Also, fermented Morinda citrifolia L extract activated the macrophage by enhancing the production of nitric oxide (NO), interleukin (IL)-6, and IL-1β, and the expression of COX2 compared to Morinda citrifolia L. extracts. The result of the study showed that Fermented Morinda citrifolia L. (Noni) and marker compound enhance the innate immunity activity and suggested that the bioactive compound could be applied as a marker compound. Thus, Fermented Morinda citrifolia L. (Noni) could be used as functional food material to develop immunity-enhancing products, and highly functional marker compounds can be utilized as the effective components.

Automated Driving Aggressiveness for Traffic Management in Automated Driving Environments (자율주행기반 교통운영관리를 위한 ADA 개념 정립 및 적용 기법 개발)

  • LEE, Seolyoung;OH, Minsoo;OH, Cheol;JEONG, Eunbi
    • Journal of Korean Society of Transportation
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    • v.36 no.1
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    • pp.38-50
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    • 2018
  • Emerging automated driving environments will lead to a mixed traffic flow depending on the interaction between automated vehicles (AVs) and manually driven vehicles (MVs) because the market penetration rate (MPR) of AVs will gradually increase over time. Understanding the characteristics of mixed traffic conditions, and developing a method to control both AV and MV maneuverings smoothly is a backbone of the traffic management in the era of automated driving. To facilitate smooth vehicle interactions, the maneuvering of AVs should be properly determined by various traffic and road conditions, which motivates this study. This study investigated whether the aggressiveness of AV maneuvering, defined as automated driving aggressiveness (ADA), affect the performance of mixed traffic flow. VISSIM microscopic simulation experiments were conducted to derive proper ADAs for satisfying both the traffic safety and the operational efficiency. Traffic conflict rates and average travel speeds were used as indicators for the performance of safety and operations. While conducting simulations, level of service(LOS) and market penetration rate(MPR) of AVs were also taken into considerations. Results implies that an effective guideline to manage the ADA under various traffic and road conditions needs to be developed from the perspective of traffic operations to optimize traffic performances.

Evaluation of Seakeeping Performance for Regulation of Vessel Traffic Control(I) (선박의 출항통제기준 마련을 위한 내항성능 평가(I))

  • Jung, Chang-Hyun;Kong, Gil-Yong
    • Journal of Navigation and Port Research
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    • v.32 no.10
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    • pp.785-791
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    • 2008
  • Because of increasement on the transportation of goods by ship and the operation of coastal ships for leisure, the interest of marine parts is growing up lately and then the safe navigation of ships are essential. In these circumstances, it is necessary that it should be examined the regulation of vessel traffic control in effect. Therefore, the wave height is analyzed on korean coast, and then the seakeeping performance with the wave height and the various hull types on operating on the coast is evaluated. These results will be helpful to the improvement of the regulation of vessel traffic control and safe navigation of coastal passenger ships.