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  • Articles  (2,081)
  • Molecular Diversity Preservation International  (863)
  • Blackwell Publishing Ltd  (518)
  • Wiley-Blackwell  (317)
  • Cambridge University Press  (163)
  • American Meteorological Society
  • Copernicus
  • Hindawi
  • Springer Nature
  • Springer Science + Business Media
  • 2020-2022
  • 2010-2014  (1,083)
  • 1985-1989  (973)
  • 1960-1964  (25)
  • 2014  (900)
  • 2010  (183)
  • 1988  (379)
  • 1987  (311)
  • 1986  (283)
  • 1964  (25)
  • Architecture, Civil Engineering, Surveying  (2,081)
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  • Articles  (2,081)
Publisher
Years
  • 2020-2022
  • 2010-2014  (1,083)
  • 1985-1989  (973)
  • 1960-1964  (25)
Year
Journal
  • 1
    Publication Date: 2014-12-01
    Description: Support system for safe driving heavily depends on global navigation satellite system. Pseudoranges between satellites and vehicles are measured to compute vehicles’ positions and their relative positions. In urban areas, however, multipath errors (MPEs) in pseudoranges, caused by obstruction and reflection of roadside buildings, greatly degrade the precision of relative positions. On the other hand, simply removing all reflected signals might lead to a shortage of satellites in fixing positions. In our previous work, we suggested solving this dilemma by cooperative relative positioning (CoRelPos) which exploits spatial correlation of MPEs. In this paper, we collected the trace data of pseudoranges by driving cars in urban areas, analyzed the properties of MPEs (specifically, their dependency on signal strength, elevation angles of satellites, and receivers’ speeds), and highlighted their spatial correlation. On this basis, the CoRelPos scheme is refined by considering the dynamics of MPEs. Evaluation results under practical vehicular scenarios confirm that properties of MPEs can be exploited to improve the precision of relative positions.
    Print ISSN: 1687-5990
    Electronic ISSN: 1687-6008
    Topics: Architecture, Civil Engineering, Surveying , Geosciences
    Published by Hindawi
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  • 2
    Publication Date: 2014-03-13
    Description: Recent research has elucidated the role of talents to explain urban growth differences but it remains to be shown whether urban dynamics, such as human capital and a mixed local population, can be linked to intraurban employment growth. By use of a unique longitudinal database, we track the economic development through the lens of intraurban employment growth of a number of primary urban areas (PUA) in Göteborg, Sweden. Regarding factors influencing employment growth, we find that relative concentrations of human capital protect areas from rising unemployment during severe recession (1990–1993) and recovery (1990–2000) while the composition of skills is beneficial during recovery (1990–2000) and long-term growth (1990–2008). Our findings suggest that neither too high concentrations of creative occupations nor too low ones are beneficial. Thus, human capital drives much of the employment changes in relation to the recession and early transition from manufacturing to service but composition of skills is more relevant for explaining long-term intraurban employment growth.
    Print ISSN: 2090-4185
    Electronic ISSN: 2090-4193
    Topics: Architecture, Civil Engineering, Surveying , Geography
    Published by Hindawi
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  • 3
    Publication Date: 2014-02-27
    Description: Radio frequency interference detection and mitigation are becoming of paramount importance due to the increasing number of services and applications based on the position obtained by means of Global Navigation Satellite Systems. A way to cope with such threats is the implementation in the receiver of advanced signal processing algorithm able to raise proper warning or improve the receiver performance. In this paper, we propose a method based on the Wavelet Transform able to split the useful signal from the interfering component in a transformed domain. The wavelet packet decomposition and proper statistical thresholds allow the algorithm to show very good performance in case of multiple pulse interference as well as in the case of narrowband interference, two scenarios in which traditional countermeasures might not be effective.
    Print ISSN: 1687-5990
    Electronic ISSN: 1687-6008
    Topics: Architecture, Civil Engineering, Surveying , Geosciences
    Published by Hindawi
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  • 4
    Publication Date: 2014-02-27
    Description: Neighborhood income and social capital are considered important for child development, but social capital has rarely been measured directly at an aggregate level. We used Canadian data to derive measures of social capital from aggregated parental judgments of neighborhood collective efficacy and neighborhood safety. Measures of neighborhood income came from Census data. Direct measures of preschoolers’ school readiness were predicted from neighborhood-level variables, with regional indicators and household/parental characteristics taken into account. Our findings show that (1) residing in Quebec, being Black, and having a parent who was born outside Canada are positively associated with children’s living in disadvantaged or low collective efficacy neighborhoods as well as with their living in low-income households. (2) Children’s odds of residential mobility were reduced when the origin neighborhood had higher collective efficacy but increased when the family rented rather than owned. (3) Both neighborhood collective efficacy and children’s ever having lived in a poor neighborhood were correlated with receptive vocabulary scores, but results were mixed for other cognitive dimensions. Children of younger mothers scored worse on receptive vocabulary. There were similar patterns for demographic predictors related to visible minority status, sibship size, and birth order. Neighborhood average income had no effect on cognitive outcomes when the region was controlled.
    Print ISSN: 2090-4185
    Electronic ISSN: 2090-4193
    Topics: Architecture, Civil Engineering, Surveying , Geography
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  • 5
    Publication Date: 2014-03-31
    Description: A three-dimensional matrix method is proposed in this paper for Global Navigation Satellite System (GNSS) constellation Intrasatellite Link (ISL) topological design. The rows and columns of proposed matrix contain the information of both constellation orbit planes and satellites in each orbit plane. The third dimension of proposed matrix represents the time sequences during constellation movement. The proposed method has virtues of better advantage of conceptual clarity and computational efficiency, meanwhile, some properties of ISLs in the constellation can be proved easily. At the second part of this paper, a link assignment and optimal routing problem is proposed using three-dimensional topology matrixes, which aimed to minimize the relay hops during the process of data uploading to whole constellation network. Moreover, some practical constrains as antenna beam coverage and relative velocity are considered and analyzed in detail. Finally, some numerical simulations are provided, and the results demonstrated the promising performance of proposed topological method in reduction of computation burden, clear ISL conception, and so forth; the efficiency of provided optimal ISL routing problem is also proved.
    Print ISSN: 1687-5990
    Electronic ISSN: 1687-6008
    Topics: Architecture, Civil Engineering, Surveying , Geosciences
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  • 6
    Publication Date: 2014-11-27
    Description: The middle of 2007 saw the beginning of a worldwide financial crisis that led to a sharp reduction in investment based on construction and urban development. This new situation is generating a new process, characterised by a slowdown that has almost reached a standstill when compared with the frenzied development of previous decades. In order to analyse these processes, this study examines urban land use changes and the urban growth rate and spatial dynamics of the metropolitan region of Madrid. The analysis has been carried out on a large scale between two periods (2000–2006 and 2006–2009) using a regional land use geodatabase. The results show the changes in the urban land use dynamics that took place over these two periods that could characterise the cities of Mediterranean Europe, where contrarily to the general pattern in Europe built-up areas are combining scattered built-up areas with new aggregated compact developments.
    Print ISSN: 2090-4185
    Electronic ISSN: 2090-4193
    Topics: Architecture, Civil Engineering, Surveying , Geography
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  • 7
    Publication Date: 2014-09-04
    Description: This paper examines the dynamics of economic change in the City of Paterson, New Jersey, from the time of its founding in the late eighteenth century to 1990, with emphasis on the post-1945 era. Analysis shows that from the time of its founding to the first half of the twentieth century, Paterson experienced a period of economic growth followed by economic decline in the 1960s, characterized by major changes in its principal industries of cotton, locomotives, and silk. Economic growth in Paterson up to the early part of the twentieth century is attributable to several locational factors, including the availability of water resources, transportation, labor supply, and markets. Its decline in the post-1945 era is attributable to a combination of local, national, and global economic factors including periods of depression, labor discord, product substitution, decentralization of economic activities, and deindustrialization. Economic decline resulted in a high rate of unemployment, poverty, and urban decay. The most significant effort to reverse urban decline in the city is the urban enterprise zone (UEZ) program. The impacts of this program on economic growth in the city, however, remain inconclusive.
    Print ISSN: 2090-4185
    Electronic ISSN: 2090-4193
    Topics: Architecture, Civil Engineering, Surveying , Geography
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  • 8
    Publication Date: 2014-07-11
    Description: This study explores urban planning office and community influence on land-use decision making in two poverty-stricken but redeveloping neighborhood areas in Chicago. The Department of Planning and Development in this study had marginal impact on land-use decisions due to administrative limitations. Community influence is moderated by the degree to which low-income housing advocates can act directly as developers and produce housing units. The research findings indicate that land-use decisions intended to benefit the low-income resulted not from community-based political conflict but more so from community organization cooperation with political actors.
    Print ISSN: 2090-4185
    Electronic ISSN: 2090-4193
    Topics: Architecture, Civil Engineering, Surveying , Geography
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  • 9
    Publication Date: 2014-02-18
    Description: This paper offers a critical review and interpretation of gentrification in Latin American cities. Applying a flexible methodology, it examines enabling conditions associated with societal regime change and local contingencies to determine its presence, nature, extent, and possibilities. Questioning the uncritical transfer of constructs such as gentrification from the Global North to the Global South, the paper advocates analyses of mediating structures and local conditions to determine their applicability and possible variations. Overall, the review questions the feasibility of self-sustained, large scale gentrification in central areas of the region’s cities today tying it to each city’s level of incorporation into global circuits and the role of local governments. Rather than an orthodox hypothesis testing, this is an exercise in interpretation that calls for nuanced approaches to the study of urban restructuring in cities of the global South.
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    Electronic ISSN: 2090-4193
    Topics: Architecture, Civil Engineering, Surveying , Geography
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  • 10
    Publication Date: 2014-04-24
    Description: Vehicle navigation systems usually simply function by calculating the shortest fastest route over a road network. In contrast, pedestrian navigation can have more diverse concerns. Pedestrians are not constrained to road/path networks; their route may involve going into buildings (where accurate satellite locational signals are not available) and they have different priorities, for example, preferring routes that are quieter or more sheltered from the weather. In addition, there are differences in how people are best directed: pedestrians noticing landmarks such as buildings, doors, and steps rather than junctions and sign posts. Landmarks exist both indoors and outdoors. A system has been developed that uses quick response (QR) codes affixed to registered landmarks allowing users to localise themselves with respect to their route and with navigational instructions given in terms of these landmarks. In addition, the system includes images of each landmark helping users to navigate visually in addition to through textual instructions and route maps. The system runs on a mobile device; the users use the device’s camera to register each landmark’s QR code and so update their position (particularly indoors) and progress through the route itinerary.
    Print ISSN: 1687-5990
    Electronic ISSN: 1687-6008
    Topics: Architecture, Civil Engineering, Surveying , Geosciences
    Published by Hindawi
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