A study on some urban bus transport networks

English and Chinese language frequency time series (LFTS) were constructed based on an English and two Chinese novels. Methods of statistical hypothesis testing were adopted to test the nonlinear properties of the LFTS. Results suggest the series exhibited non-normal, auto-correlative, and stationary characteristics. Moreover, we found that LFTS follow the power law distributions, and thereby we investigated the fractal structure, long range correlation, and intermittency, which indicated the self-similarity features of LFTS, and also provided hints that human societies are likely to share some universal properties. , on the other hand, analyzed the Chinese character system, supposing that radicals comprised nodes and that two nodes were linked if they could form a character or part of one. Their results revealed that character networks displayed small-word properties and showed non-Poisson degree distributions. Liu [5] built a Chinese semantic network based on a treebank with semantic role annotation and then investigated its global statistical properties. Liu and Li [6] also explored 15 linguistic complex networks based on the dependency of the syntactic treebanks of 15 languages. Yu et al. [7] described a series of identification experiments and rating experiments on the influences of the distance, spectral shape, and relative amplitude of the first two formants of the phonetic quality of /γ/.In addition to the network point of view, however, time series analysis is also an important method for extracting information from signals related to real world complex systems. By analyzing such signals, we can better understand the underlying properties of complex systems.Thus, time series analysis methods have also been used to investigate written human language texts [8][9][10][11]. Currently, there are two ways to map a text into a time series. One counts the number of letters of each word, namely word length l, while time t refers to the position of the word in the document, i.e. the first word is considered to appear at time t=1, the second at time t=2, etc. By mapping word length to time in this way, length time series l(t) are constructed. The second way calculates the probability of appearances of each word in a text, namely the frequency f, while time t refers, again, to the position of the word; thus frequency time series f(t) are constructed.

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“…As seen in Figure 1, the distributions of the language frequency time series all follow the shifted power law (SPL) [16] function:…”

Section: Distribution Of the Language Frequency Time Seriesmentioning

confidence: 85%

English and Chinese language frequency time series analysis

Deng

Wang

et al. 2011

Chin. Sci. Bull.

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“…To our knowledge, an urban bus-transport network can be mapped into two spaces: space P and space L [30][31][32] . In both spaces, nodes have the same meaning, they represent the bus stations.…”

Section: The Model Of Layered Bus-transport Networkmentioning

confidence: 99%

Robustness Analysis of Layered Public Transport Networks Due to Edge Overload Breakdown

Dong¹,

Yang²,

Chen³

2014

IJITCS

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Abstract-The robustness of urban bus-transport networks has important influence on the network performance. This paper proposes the model of layered public bus-transport network which is composed of the logical layer and the physical layer and expounds the relationship between these two layers. We map the bustransport network into two spaces: space P and space L and take space P as logical layer while space L as physical layer. We define the load of edges in the physical layer according to the traffic flow in the logical layer and assume that a removed edge only leads to a redistribution of the load through it to its neighboring edges. We analysis the robustness of layered public bustransport networks in the face of cascading failure under the case of removing the edge with the highest load and redistributing of the load. Through the simulation of the public bus-transport networks of three major cities in China, we find that in the layered public bus-transport network the traffic flow in the logical layer affects the distribution of load of edges in the physical layer. The removal of the edge with the highest load may lead to the cascading failures of the physical layer, and the avalanche size decreases with the increase of the tolerance parameter.

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“…Demand capitalization If the frequency is increased, the offer of transport increases so the probability that the demand uses the transport service increases (Chen et al [13]). …”

Section: 273mentioning

confidence: 99%

Case report of overcrowded buses and a possible solution

Rocha

2008

WIT Transactions on the Built Environment

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This paper reports a case of overcrowded buses and a possible solution. Project management methodology is used in transport planning.The paper is divided into three main parts. The first part is raw material. Case report scenario and methodological steps are presented. The second part is the processor. Methodological steps are explored using a specific case as an example. The third part is the final product. The case solution is presented and the lessons learnt are shared.Project management is used in huge projects, with lots of interlocutors, high quality and environmental standards and higher budgets. In smaller projects, it is considered a waste of resources. This paper tries to prove that with adjustments, project management methodology could be useful in small projects.Project management classical methodology was used as a base to design a general plan. Parallel to the general plan is the task plan. The task plan organizes the tasks considering project characteristics like working team dimensions, deadlines and budget. In this project a task plan was developed for a one person working team, close deadlines and low budget.The project management main issue is to always improve the standards so the most important lesson taken from this project was that task organization could define the project success so it should receive close attention.

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A study on some urban bus transport networks

Cited by 96 publications

References 19 publications

English and Chinese language frequency time series analysis

English and Chinese language frequency time series analysis

Robustness Analysis of Layered Public Transport Networks Due to Edge Overload Breakdown

Case report of overcrowded buses and a possible solution

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