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Robustness analysis metrics for worldwide airport network：A comprehensive study

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Chinese Journal of Aeronautics 2017年第2期30卷 500-512页

作者： Sun Xiaoqian Volker Gollnick sebastian wandelt School of Electronic and Information Engineering Beihang University 100083 Beijing China Beijing Key Laboratory for Network-based Cooperative A TM Beijing 100083 China Beijing Laboratory for General Aviation Technology Beijing 100083 China Institute of Air Transportation Systems German Aerospace Center Blohmstrasse 18 21079 Hamburg Germany

Robustness of transportation networks is one of the major challenges of the 21 st *** paper investigates the resilience of global air transportation from a complex network point of view,with focus on attacking strategies in the airport network,i.e.,to remove airports from the system and see what could affect the air traffic system from a passenger＇s ***,we identify commonalities and differences between several robustness measures and attacking strategies,proposing a novel notion of functional robustness：unaffected passengers with *** apply twelve attacking strategies to the worldwide airport network with three weights,and evaluate three robustness *** find that degree and Bonacich based attacks harm passenger weighted network *** evaluation is geared toward a unified view on air transportation network attack and serves as a foundation on how to develop effective mitigation strategies.

关键词： Air transportation systems resilience Airport network Attacking strategy Robustness measure

Why are COVID-19 travel bubbles a tightrope walk?An investigation based on the Trans-Tasmanian case

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Communications in Transportation Research 2023年第1期3卷 37-43页

作者： Xiaoqian Sun sebastian wandelt Anming Zhang National Key Laboratory of CNS/ATM School of Electronic and Information EngineeringBeihang UniversityBeijing100191China Sauder School of Business University of British ColumbiaVancouverBCCanada

The COVID-19 pandemic has hit the transportation sector hard;particularly air transportation,as a major mode of long-distance transportation,has been affected *** the dawn of COVID-19,politicians and policy makers have discussed the idea of introducing travel bubbles between countries(or counties),to allow for a continued exchange of people and *** eponymous Trans-Tasmanian travel bubble is a major example,involving quarantine-free travel between Australia and New *** both countries have tried to form a travel bubble various times,recurring setbacks and difficulties were *** October 2021,this ambitious project presumably has come to an end,with both countries announcing the essential capitulation of their COVIDZero strategies and a planned opening towards broader international *** this study,we perform a close investigation of the history behind the Trans-Tasmanian travel bubble as an on-off relationship,identifying a set of drivers for the serious problems involving a sustainable setup and *** develop a framework which represents important factors for successful travel bubbles and believe that the satisfaction of all factors at once is extremely *** results and insights are not specific to the Trans-Tasmanian case only,although it is taken as a running example,but can be generalized to various scales and *** hope that our study contributes to the literature by improving our understanding of the highly buzzed travel bubble concept,while providing empirical evidence for the troubles that inherently make such bubbles a tightrope walk.

关键词： COVID-19 Travel bubble Australia New Zealand

Efficient and Effective 4D Trajectory Data Cleansing

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Transactions of Nanjing University of Aeronautics and Astronautics 2020年第2期37卷 288-299页

作者： TAN Xin SUN Xiaoqian ZHANG Chunxiao wandelt sebastian National Key Laboratory of CNS/ATM Beihang UniversityBeijing 100191P.R.China School of Electronic and Information Engineering Beihang UniversityBeijing 100191P.R.China

As the rapid development of aviation industry and newly emerging crowd-sourcing projects such as Flightradar24 and FlightAware,large amount of air traffic data,particularly four-dimension(4D)trajectory data,have become available for the *** order to guarantee the accuracy and reliability of results,data cleansing is the first step in analyzing 4D trajectory data,including error identification and *** cleansing techniques for the 4D trajectory data are *** propagation(BP)neural network algorithm is applied to repair *** interpolation method is used to obtain even-spaced trajectory samples over a uniform distribution of each flight’s 4D trajectory ***,a new method is proposed to compress data while maintaining the intrinsic characteristics of the ***-based spatial clustering of applications with noise(DBSCAN)is applied to identify remaining outliers of sample *** are performed on a data set of one-day 4D trajectory data over *** results show that the proposed method can achieve more efficient and effective results than the existing *** work contributes to the first step of data preprocessing and lays foundation for further downstream 4D trajectory analysis.

关键词： 4D trajectories data cleansing outlier detection repair

面向月球基地设备交互场景的目标检测与路径规划算法研究

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导航定位与授时 2024年第3期11卷 36-47页

作者：杨旭吕书畅王强杨旭凌鑫阳 sebastian wandelt 北京航空航天大学电子信息工程学院北京100089

随着国际月球科研站计划的快速推进,针对月球基地相关技术的研究受到了广泛关注。面向月球基地场景下不同的设备间进行自主接触式交互这一应用背景展开研究。考虑不同的设备在进行自主接触式交互时,需要准确地完成相互识别,并且规划出... 详细信息

随着国际月球科研站计划的快速推进,针对月球基地相关技术的研究受到了广泛关注。面向月球基地场景下不同的设备间进行自主接触式交互这一应用背景展开研究。考虑不同的设备在进行自主接触式交互时,需要准确地完成相互识别,并且规划出畅行无阻且较优的行进路线以保证往返活动顺利进行,基于Webots搭建了月球基地仿真环境进行目标检测和路径规划相关实验。以前后配备高精度RGB相机的交互设备为载体实现基于TPH-YOLOv5月球基地场景下的目标检测。此外,设计并实现了交互设备在月球基地场景下基于双向快速扩展随机树(Bidirec-tionalRTT)的路径规划算法,以保证交互设备在月球基地环境下的相关工作顺利进行。仿真结果显示,该目标检测及路径规划算法能够实现预期功能。

关键词：月球基地设备交互 TPH-YOLOv5目标检测双向快速扩展随机树路径规划

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The German Energiewende and its roll-out of renewableenergies： An economic perspective

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Frontiers in Energy 2017年第2期11卷 126-134页

作者： sebastian KREUZ Felix MUSGENS Faculty of Mechanical Engineering Electrical and Energy SystemsBrandenburg University of Technology 03046 Cottbus Germany

This paper gives a short overview of the German Energiewende, i.e. the transition of a large and mostly thermal electricity system towards electricity generation from renewable energy source. It discusses both, the motivation of the transitions as future goals and current status. Furthermore, it gives an in-depth view into the changes in economic costs for society as well as electricity price effects, especially for average private households and industrial consumers. It also discusses the benefits of the promotion of renewable energies in Germany.

关键词： electricity system renewable energy cost-benefit analysis

Influence of Non-Uniform Temperature Distribution on Metallic Charge Length on Energy and Force Parameters During Groove-Rolling

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Journal of Iron and Steel Research International 2012年第8期19卷 17-24页

作者： Mróz sebastian Czestochowa University of Technology

Change in the temperature of band over its length, associated with the stock being non-uniformly heated in the furnace, influences the variations in the magnitudes of energy-force parameters. Using the FEM (Finite Element Model) programs for the computation of the values of the energy-force parameters can take into account the distribution of temperature over the band length. The mathematical model of the computer program Forge2008 was used to theoretically examine the energy-force parameters and plastic metal flow in the roughing stands of the continuous rolling mill. The results of experimental investigation of influence of the non-uniform temperature distribution were presented on the metallic charge length on the energy and force parameters and dimensions of the band during round bars rolling. Thermovision monitoring energy and force parameters monitoring were carried out in continuous rolling mill D350 in one of the Polish industrial plants. On the basis of obtained results, it could be stated that non-uniform distribution of temperatures along the charge length causes local increase of energy and force parameters values and also such distribution affects the local increase of the width of rolled band. The rolling process of charge with non-uniform distribution of temperature could lead to exceeding required dimensional tolerances of the final products.

关键词： groove-rolling energy parameter force parameter numerical technique FEM

Towards a Local-Level Resilience Composite Index: Introducing Different Degrees of Indicator Quantification

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International Journal of Disaster Risk Science 2017年第1期8卷 91-99页

作者： sebastian Jlich Regional Economics and Development Economics and Social SciencesSwiss Federal Research Institute WSL8903 BirmensdorfSwitzerland

Within disaster resilience research there is a trend of developing quantitative metrics for resilience analysis. Quantitative indicators can be useful for decision makers in the field of resilience building to prioritize preventive actions to target the least resilient. This study explores possibilities and constraints in quantifying disaster resilience at the local level. While national or regionallevel indicators mostly employ existing secondary source data, at the local level it is necessary to collect new data in most cases. The main aim of this study is to investigate how resilience indicators with different stages of operationalization can be developed at the local level. Using the example of the Swiss canton of Grisons, three local-level partial indicators for community resilience against natural hazard are developed. In this process qualitative research is the necessary basis to construct quantitative indicators. For each partial indicator different stages of quantification are offered to illustrate how quantitatively operationalized indicators can be developed and to examine their strengths and weaknesses. For this purpose a classification of different indicator operationalization stages is proposed,ranging from vague qualitative criteria to fully quantified criteria.

关键词： Disaster resilience Indicator development Resilience index Risk and loss perception Switzerland

Active protection of work area against explosion of dust-gas mixture

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International Journal of Coal Science & Technology 2021年第4期8卷 674-684页

作者： Zbigniew Szkudlarek sebastian Janas KOMAG Institute of Mining Technology 44-101 GliwicePoland

Potentially explosive atmosphere can occur not only in the production systems of the food,energy,chemical and petrochemical industries but also in the production processes of the mining ***,vapours,mists and dusts arise can escape in an uncontrolled way during production,processing,transportation and storage of flammable *** combination with oxygen,they create explosive atmospheres that,if ignited,lead to an explosion causing catastrophic damage to peopled lives and *** protect against the results of hazardous dust-gas mixtures explosions in a confined work space,where employees can stay,various control and protection mechanisms are used in the form of an active explosion-proof *** article presents the results of tests on an active system for limiting the effects of ignition of gas and/or dust based on a highly efficient explosion suppression system-equipped with an ignition detection system,high-pressure fire extinguisher and a power supply and trigger *** powder was used as the explosive charge and sodium bicarbonate as the suppressive *** of the effectiveness of the active explosion suppression system were carried out on two devices:a small-size dry dust collector and a zone extinguishing system adapted for direct explosion suppression in closed working *** both cases,the explosion suppression process took place through the action of extinguishing powder blown out of the fire extinguisher after membrane perforation by compressed combustion products.

关键词： Gas hazard Explosive dust Suppression of explosion Safety of work area

Micro-Task Processing in Heterogeneous Reconfigurable Systems

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Journal of Computer Science & Technology 2005年第5期20卷 624-634页

作者： sebastian Wallner Department of Distributed Systems Technical University of Hamburg-Harburg Schwarzenbergstrasse 95 D-21073 Hambur9 Germany

New reconfigurable computing architectures are introduced to overcome some of the limitations of conventional microprocessors and fine-grained reconfigurable devices （e.g., FPGAs）. One of the new promising architectures axe Configurable System-on-Chip （CSoC） solutions. They were designed to offer high computational performance for real-time signal processing and for a wide range of applications exhibiting high degrees of parallelism. The programming of such systems is an inherently challenging problem due to the lack of an programming model. This paper describes a novel heterogeneous system architecture for signal processing and data streaming applications. It offers high computational performance and a high degree of flexibility and adaptability by employing a micro Task Controller （mTC） unit in conjunction with programmable and configurable hardware. The hierarchically organized architecture provides a programming model, allows an efficient mapping of applications and is shown to be easy scalable to future VLSI technologies. Several mappings of commonly used digital signal processing algorithms for future telecommunication and multimedia systems and implementation results axe given for a standard-cell ASIC design realization in 0.18 micron 6-layer UMC CMOS technology.

关键词： system-on-chip reconfigurable heterogeneous architectures configuration instructions descriptors parallel processing system signal processing