1,105 research outputs found

    The Material City: Potential for Urban Development in Mapping Material Processes, Erosion and Obsolescence in Helsinki

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    Urban development hinges on the availability of free space. The planned growth of Helsinki as reflected in the General plan of 2016 relies on identifying areas for infill in the urban fabric. In built-up areas there is a tendency to let the processes of urban change take place instead of top-down planning. This change is therefore not managed, but piecemeal, resulting in a patchwork of ‘stamp’ plans directed by narrow private economic considerations.       The life-span of buildings varies according to their material composition – also the type of a building and its spatial configuration affect its vitality. These attributes and conditions play a part in how long a building can endure before confronting the need for radical changes, and can be aggregated from open-source data and modeled using historical referents as benchmarks. This information forms a layer of probabilities in the city, revealing dormant locations facing imminent change.                 By mapping the information of the material conditions on the topography of the city, we can identify potentials for development. Identifying these latent sites in the city and engaging proprietors and landowners would give new tools for the City to affect the change and renewal associated with turnover of the building stock

    Improved Bounds on Information Dissemination by Manhattan Random Waypoint Model

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    With the popularity of portable wireless devices it is important to model and predict how information or contagions spread by natural human mobility -- for understanding the spreading of deadly infectious diseases and for improving delay tolerant communication schemes. Formally, we model this problem by considering MM moving agents, where each agent initially carries a \emph{distinct} bit of information. When two agents are at the same location or in close proximity to one another, they share all their information with each other. We would like to know the time it takes until all bits of information reach all agents, called the \textit{flood time}, and how it depends on the way agents move, the size and shape of the network and the number of agents moving in the network. We provide rigorous analysis for the \MRWP model (which takes paths with minimum number of turns), a convenient model used previously to analyze mobile agents, and find that with high probability the flood time is bounded by O(NlogM(N/M)log(NM))O\big(N\log M\lceil(N/M) \log(NM)\rceil\big), where MM agents move on an N×NN\times N grid. In addition to extensive simulations, we use a data set of taxi trajectories to show that our method can successfully predict flood times in both experimental settings and the real world.Comment: 10 pages, ACM SIGSPATIAL 2018, Seattle, U

    Promises of the "Book of Hope" : influences on the new Malaysian government

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    For more about the East-West Center, see http://www.eastwestcenter.org/Tommy K. S. Koh, former Summer Affiliate Scholar at the East-West Center, explains that "Written as an opposition manifesto, Buku Harapan's desire for greater parliamentary engagement reflected what Pakatan Harapan desired from an expected ruling Barisan Nasional government.

    Optimal Design of Hierarchical Ring Networks

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