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NEW STRATEGY THE FOR DESIGNATION OF THE INTEGRITY PARAMETER IN SBAS POSITIONING IN AIR TRANSPORT 在航空运输中指定 sbas 定位完整性参数的新策略
Pub Date : 2024-03-01 DOI: 10.20858/sjsutst.2024.122.13
M. Mrozik, J. Kozuba, K. Krasuski, J. Ćwiklak, Mieczysław Bakuła, Bilal Beldjilali
The article shows the results of a study on the determination of SBAS satellite positioning integrity parameters as a HPL and VPL protection levels. To this end, a modified algorithm was developed to determine the HPL and VPL protection levels from a common aircraft position navigation solution based on EGNOS and SDCM augmentation systems. The developed mathematical scheme was verified on real GNSS kinematic data recorded by two onboard Septentrio AsterRx2i and Trimble Alloy receivers installed on a Diamond DA 20-C aircraft. Based on the conducted tests, it was found that the HPL parameter does not exceed 12.24 m, while respectively the VPL does not exceed 18.01 m. In addition, in the course of the study it was found that the proposed EGNOS+SDCM solution improves the HPL/VPL integrity determination in relation to the EGNOS solution by 8÷66%. The mathematical scheme used in the study was also applied to designation the HPL/VPL terms for the UAV platform. The obtained results of the HPL/VPL values for the positioning of the aircraft and the UAV platform show a high efficiency of the developed algorithm for improving the integrity parameter.
文章展示了关于确定 SBAS 卫星定位完整性参数作为 HPL 和 VPL 保护级别的研究结果。为此,开发了一种改进算法,用于根据基于 EGNOS 和 SDCM 增强系统的通用飞机定位导航解决方案确定 HPL 和 VPL 保护级别。在钻石 DA 20-C 飞机上安装的两个机载 Septentrio AsterRx2i 和 Trimble Alloy 接收机记录的真实 GNSS 运动数据上对开发的数学方案进行了验证。此外,在研究过程中还发现,与 EGNOS 解决方案相比,拟议的 EGNOS+SDCM 解决方案在确定 HPL/VPL 完整性方面提高了 8%至 66%。研究中使用的数学方案还被用于指定无人机平台的 HPL/VPL 项。飞机和无人机平台定位的 HPL/VPL 值结果表明,所开发的算法在改善完整性参数方面具有很高的效率。
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引用次数: 0
PUBLIC-PRIVATE PARTNERSHIP PROCUREMENT TRANSPORT INFRASTRUCTURE DELIVERY: ASSESSING THE MANAGERIAL CAPABILITIES OF PUBLIC-SECTOR ORGANIZATIONS IN AFRICA 公私合作采购运输基础设施的交付:评估非洲公共部门组织的管理能力
Pub Date : 2024-03-01 DOI: 10.20858/sjsutst.2024.122.14
B. Olojede
The lingering imbalance between infrastructural services demand and supply poses serious threats to the fiscal budget balance from contingent liabilities of African countries. Despite the increasing private investment commitments and adoption of public-private partnership procurement (PPP) options to address the widening infrastructure gaps in Africa, the failure in the delivery of public infrastructure projects is yet a common phenomenon. This study therefore examined the managerial capabilities of public-sector organizations (PSOs), who steer the provisions of public infrastructure, to investigate their readiness to achieve the value for money from private funding and the benefits of PPP options. The study conducted a self-study structured questionnaire survey on professionals in PSOs in Africa, particularly Nigeria, who have been directly involved in the delivery of public infrastructure projects via PPP. The professionals were purposively sampled and the primary data obtained was subjected to descriptive and inferential analysis. The study revealed that the PSOs have internalized about 41 PPP-capabilities for the delivery of public infrastructure projects. Up to 40 PPP-capabilities were exhibited on an average score (41-60%) level, with mean score (MS) value range of 3.13 ≤ MS ≤ 3.70, for the public projects procured. The study established the existence of significant interdependence of p < 0.001, which indicated sufficient correlation between 31 PPP-capabilities and explained the 10 main components of managerial capabilities possessed by the PSOs. Some of the components clustered around public infrastructure planning and adaptability to PPP programme, project delivery parameters and control, suitable public infrastructure procurement knowledge, public policy awareness and innovation, and governance. The study provides information crucial for public infrastructure delivery success towards sustainable national economic recovery and development.
基础设施服务供需之间长期存在的不平衡对非洲国家或有负债造成的财政预算平衡构成严重威胁。尽管私人投资承诺不断增加,并采用公私合作采购(PPP)方案来解决非洲日益扩大的基础设施差距,但公共基础设施项目交付失败仍是一个普遍现象。因此,本研究考察了负责提供公共基础设施的公共部门组织(PSOs)的管理能力,以调查其是否准备好从私人资金中实现资金效益以及公私伙伴关系方案的益处。本研究对非洲(尤其是尼日利亚)公共部门组织中直接参与通过公私伙伴关系交付公共基础设施项目的专业人员进行了自学式结构化问卷调查。对这些专业人员进行了有目的的抽样调查,并对获得的原始数据进行了描述性和推论性分析。研究显示,公共服务组织在交付公共基础设施项目时,已内部化了约 41 项 PPP 能力。在平均得分(41%-60%)水平上,多达 40 项 PPP 能力得到了展示,采购的公共项目的平均得分(MS)值范围为 3.13 ≤ MS ≤ 3.70。研究表明,31 项 PPP 能力之间存在明显的相互依存关系(P < 0.001),这表明 31 项 PPP 能力之间存在充分的相关性,并解释了公共服务组织所拥有的管理能力的 10 个主要组成部分。其中一些要素集中在公共基础设施规划和对公私伙伴关系方案的适应性、项目交付参数和控制、合适的公共基础设施采购知识、公共政策意识和创新以及治理。这项研究提供了对成功交付公共基础设施以实现可持续国家经济复苏和发展至关重要的信息。
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引用次数: 0
CALIBRATION OF MICROSCOPIC TRAFFIC SIMULATION OF URBAN ROAD NETWORK INCLUDING MINI-ROUNDABOUTS AND UNSIGNALIZED INTERSECTION USING OPEN-SOURCE SIMULATION TOOL 使用开源模拟工具校准包括小型环岛和无信号交叉口在内的城市路网的微观交通模拟
Pub Date : 2024-03-01 DOI: 10.20858/sjsutst.2024.122.17
Mehmet Nedim Yavuz, Halit Özen
Microscopic traffic simulation models offer an effective way to analyze and assess different transportation systems thanks to their efficiency and reliability. As traffic management issues become more prevalent, notably in urban areas, simulation tools enable a significant opportunity to replicate real-world conditions before implementation. Therefore, the calibration of traffic simulation models plays a substantial role in obtaining accurate and confidential results. Nowadays, urban regions are facing the challenge of restricted space for developing traffic solutions. As a consequence of environmental restrictions, the use of mini-roundabouts rather than larger roundabouts is increasing. Based on the given literature review, it is seen that not much attention was given to the complex modeling and calibration of microsimulation models of mini-roundabouts and unsignalized intersections. The objective of this study is to offer the calibration of microscopic traffic simulation of urban road network, including closely located mini-roundabouts and unsignalized intersection. To this end, an open-source tool called SUMO (Simulation of Urban Mobility) was utilized as a simulation environment in this study. The necessary data for developing a microsimulation model in SUMO was gathered using a videography technique. The traffic count data and speed were considered performance measures between field observations and simulation outputs. The routeSampler tool of SUMO, which has recently emerged in the literature, was used to match traffic count data and the corresponding time interval for traffic volume data calibration. The calibration of car-following model parameters using a trial-and-error approach was employed based on mean absolute percent error (MAPE) between simulated speeds and field-measured speeds. According to the findings of the study, the simulation model fulfilled the calibration aims of the FHWA guideline and is suitable for further research.
微观交通仿真模型以其高效性和可靠性,为分析和评估不同的交通系统提供了有效途径。随着交通管理问题越来越普遍,特别是在城市地区,仿真工具提供了一个在实施前复制真实世界条件的重要机会。因此,交通仿真模型的校准对于获得准确、保密的结果起着重要作用。如今,城市地区正面临着交通解决方案开发空间受限的挑战。由于环境限制,人们越来越多地使用小型环岛而不是大型环岛。根据所提供的文献综述,我们可以看出,人们对小型环岛和无信号交叉口微观模拟模型的复杂建模和校准关注不多。本研究的目的是对城市路网的微观交通模拟进行校准,包括位置较近的小型环岛和无信号交叉口。为此,本研究使用了名为 SUMO(城市交通仿真)的开源工具作为仿真环境。在 SUMO 中开发微观模拟模型所需的数据是通过摄像技术收集的。交通流量数据和车速被视为实地观测和模拟输出之间的性能指标。最近在文献中出现的 SUMO 的路线取样器工具用于匹配交通流量数据和相应的时间间隔,以进行交通流量数据校准。根据模拟速度与实地测量速度之间的平均绝对百分比误差 (MAPE),采用试错法校准汽车跟随模型参数。根据研究结果,模拟模型达到了 FHWA 指南的校准目的,适合进一步研究。
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引用次数: 0
WELDING OF 1.4462 DUPLEX STEEL USED IN MEANS OF ROAD TRANSPORT 道路运输工具中使用的 1.4462 双相钢的焊接
Pub Date : 2024-03-01 DOI: 10.20858/sjsutst.2024.122.15
B. Szczucka-Lasota, T. Wȩgrzyn
Materials with good mechanical and chemical properties (materials should be resistant to various types of corrosion) are proposed for the various structures of means of transport. For this reason, high-alloy steels, including duplex steels, are increasingly used in the automotive industry. The 1.4462 duplex steel used in means of road transport steel could be treated as an interesting high-strength stainless material used in the automotive industry. Generally, duplex steels have a high resistance to localized and uniform corrosion. The duplex and superduplex steels are assumed to be rather proper weldable materials; however, cracks could be observed both in the heat-affected zone (HAZ) and in the weld. The article analyses the influence of tubular cored metal arc (136) with active gas shield welding (process 136) parameters on the arrangement of correct joints used in tanker truck elements, as an example of welding in the automotive sector. Various mechanical tests checking the properties of joints were realized. The goal of the paper is to choose the correct welding parameters for elements of 1.4462 steel. The construction elements of a tanker truck are made by the 136 method of welding.
建议在运输工具的各种结构中使用具有良好机械和化学特性(材料应能抵抗各种腐蚀)的材料。因此,包括双相钢在内的高合金钢越来越多地应用于汽车行业。道路运输工具钢中使用的 1.4462 双相钢可以被视为汽车行业中使用的一种高强度不锈钢材料。一般来说,双相钢具有很强的抗局部和均匀腐蚀的能力。双相钢和超级双相钢被认为是非常适合焊接的材料;然而,在热影响区(HAZ)和焊缝中都可以观察到裂纹。文章以汽车行业的焊接为例,分析了管状药芯金属弧焊(136)和活性气体保护焊(工艺 136)参数对油罐车部件正确接头布置的影响。对接头的性能进行了各种机械测试。本文的目的是为 1.4462 钢构件选择正确的焊接参数。油罐车的结构件采用 136 焊接法制造。
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引用次数: 0
THE EFFECTS OF ENVIRONMENTAL PECULIARITIES ON TRANSPORTATION INFRASTRUCTURE PERFORMANCE IN LAGOS METROPOLIS, NIGERIA: RESIDENTS' EXPERIENCES 环境特殊性对尼日利亚拉各斯大都市交通基础设施性能的影响:居民的经验
Pub Date : 2024-03-01 DOI: 10.20858/sjsutst.2024.122.1
A. Akanmu, U. Salisu
Efficient transportation infrastructure is pivotal for the seamless functioning of global cities, with coastal cities facing unique challenges due to environmental peculiarities. This study delves into how Lagos' environmental peculiarities impact transportation infrastructure performance, shedding light on both positive and negative implications. A comprehensive survey involving 1284 residents within Lagos Metropolis was conducted using multistage sampling techniques. A combination of descriptive (percentage and mean-weighted analysis) and inferential (Fisher’s exact test and Phi Cramer's V Test) statistics was adopted for data analysis. Major findings revealed that the environmental peculiarities in Lagos foster the use of multimodal infrastructure options and concurrently exert adverse effects on various facets of transportation infrastructure performance, including travel cost, commuting time, fare charges, wear and tear of infrastructure, and the overall cost of maintenance and repairs. The results of the Fisher’s exact test underscore the undeniable impact of Lagos' environmental peculiarities on transportation infrastructure performance (p = 0.000 < 0.05). This study concludes that high water tables, as a representative environmental peculiarity, substantially influence transportation infrastructure performance, shaping the mobility needs of residents. In light of these findings, the study advocates for the full implementation of sustainable infrastructure solutions. Recommendations include establishing robust drainage systems, incorporating corrosion-resistant materials, and adopting innovative technologies to mitigate the repercussions of rising sea levels on critical transportation infrastructure, enhancing its resilience in the face of environmental challenges.
高效的交通基础设施对于全球城市的无缝运作至关重要,而沿海城市由于环境的特殊性面临着独特的挑战。本研究深入探讨了拉各斯的环境特殊性如何影响交通基础设施的性能,揭示了积极和消极的影响。研究采用多阶段抽样技术,对拉各斯大都市的 1284 名居民进行了全面调查。数据分析采用了描述性统计(百分比和平均加权分析)和推论性统计(费雪精确检验和 Phi Cramer's V 检验)相结合的方法。主要研究结果表明,拉各斯的环境特殊性促进了多式联运基础设施的使用,同时也对交通基础设施的各方面性能产生了不利影响,包括旅行成本、通勤时间、票价、基础设施的损耗以及维护和维修的总体成本。费雪精确检验的结果表明,拉各斯的环境特殊性对交通基础设施性能的影响是不可否认的(p = 0.000 < 0.05)。本研究得出结论,高地下水位作为一种具有代表性的环境特征,对交通基础设施的性能产生了重大影响,进而影响了居民的出行需求。鉴于这些发现,本研究主张全面实施可持续基础设施解决方案。建议包括建立强大的排水系统,采用抗腐蚀材料,以及采用创新技术,以减轻海平面上升对关键交通基础设施的影响,增强其面对环境挑战的复原力。
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引用次数: 0
NEED FOR SMART MOBILITY AND CHALLENGES AND OPPORTUNITIES FOR TRANSITIONING TOWARD IT IN CAR-DEPENDENT COUNTRIES: INSIGHTS FROM LITERATURE 依赖汽车的国家对智能交通的需求以及向智能交通过渡的挑战和机遇:文献启示
Pub Date : 2024-03-01 DOI: 10.20858/sjsutst.2024.122.2
Talal Almaghlouth, U. Gazder, Osama Abudayyeh
Car dependence is a trend brought about by the desire for comfortable transportation, in many countries around the world. After the invention and acceptance of automobiles, cities were designed with layouts that favored automobiles at the expense of other forms of transportation. However, the situation has changed with research and execution of plans for smart cities, with smart mobility transition taking centre stage. The purpose of this research is to highlight the need for transition to smart mobility, provide detailed description of various aspects of smart mobility and analyse the challenges and opportunities associated with the transition to smart mobility in car-dependent countries. A thorough and critical review of the literature has been done to achieve the aim of this study. Previous research efforts indicated that car-dependent cities have experienced several challenges in their transition to smart mobility, including inadequate infrastructure, low acceptance of new technological solutions, inadequate knowledge and framework for big data, financial constraints, data quality management, integration of data from different sources, privacy issues, and development of appropriate of government policies. There are several promising recommendations, which implementation is expected to help car-dependent countries overcome the above challenges and open opportunities for a successful transition. These recommendations include implementation of aggressive government policies, practicing greater inclusivity, and planning for the future of smart mobility by investing in Internet of Things (IoT) applications and reliable infrastructure. To facilitate the decision makers, challenges have been mapped with recommendations for transition to smart mobility, in light of the review findings.
对汽车的依赖是世界上许多国家对舒适交通的渴望所带来的一种趋势。在汽车发明并被人们接受之后,城市的设计布局偏向于汽车,而忽视了其他交通方式。然而,随着智能城市计划的研究和实施,情况发生了变化,智能交通转型占据了中心位置。本研究旨在强调向智能交通转型的必要性,详细介绍智能交通的各个方面,并分析依赖汽车的国家向智能交通转型所面临的挑战和机遇。为实现本研究的目标,我们对文献进行了全面而严格的审查。以往的研究表明,依赖汽车的城市在向智能交通转型的过程中遇到了一些挑战,包括基础设施不足、对新技术解决方案的接受度低、对大数据的认识和框架不足、资金限制、数据质量管理、整合不同来源的数据、隐私问题以及制定适当的政府政策。有几项建议很有前景,实施这些建议有望帮助依赖汽车的国家克服上述挑战,为成功转型创造机会。这些建议包括实施积极的政府政策,实行更大的包容性,以及通过投资物联网(IoT)应用和可靠的基础设施来规划智能交通的未来。为方便决策者,我们根据审查结果,将挑战与向智能交通转型的建议进行了映射。
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引用次数: 0
EXAMINING THE SAFETY IMPACTS OF TRANSIT PRIORITY SIGNAL SYSTEMS USING SIMULATION TECHNIQUES 利用模拟技术研究公交优先信号系统对安全的影响
Pub Date : 2024-03-01 DOI: 10.20858/sjsutst.2024.122.4
E. Doğan
Transit Priority Signal (TPS) systems are increasingly used to improve traffic efficiency and reduce passenger waiting times. However, such systems may carry potential safety risks. This study aims to investigate the safety effects of TPS at intersections. Our study utilized the SUMO traffic simulation program to create a road network model containing nine signalized intersections. Subsequently, the TPS system was applied to selected bus routes within the road network, and the cases with and without TPS implementation were compared in terms of safety and performance. In safety-oriented comparisons, surrogate safety measures were employed, including number of conflict and Time to Collision (TTC). Signalized intersection performances were measured and compared in terms of the number and duration of stops. The analysis results indicate that TPS enhances safety and transportation performance for buses, but adversely impacts safety and transportation performance for passenger cars. This study underscores the importance of considering safety aspects in the implementation of TPS aimed at improving passenger transportation efficiency. These findings may contribute to the enhancement of public transportation infrastructure and the implementation of appropriate safety measures.
公交优先信号(TPS)系统越来越多地用于提高交通效率和减少乘客等候时间。然而,这类系统可能存在潜在的安全风险。本研究旨在调查 TPS 对交叉口安全的影响。我们的研究利用 SUMO 交通模拟程序创建了一个包含九个信号交叉口的道路网络模型。随后,将 TPS 系统应用于路网中选定的公交线路,并对实施和未实施 TPS 的情况进行了安全和性能方面的比较。在以安全为导向的比较中,采用了替代安全措施,包括冲突次数和碰撞时间(TTC)。信号灯交叉口的性能则根据停车次数和持续时间进行测量和比较。分析结果表明,TPS 提高了公共汽车的安全和运输性能,但对小客车的安全和运输性能产生了不利影响。这项研究强调了在实施旨在提高客运效率的 TPS 时考虑安全因素的重要性。这些研究结果可能有助于改善公共交通基础设施和实施适当的安全措施。
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引用次数: 0
期刊
Scientific Journal of Silesian University of Technology. Series Transport
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