Soong Kang - Academia.edu (original) (raw)

Papers by Soong Kang

Zenodo (CERN European Organization for Nuclear Research), Apr 19, 2023

arXiv (Cornell University), Dec 7, 2022

Scientific Reports

The polycentric city model has gained popularity in spatial planning policy, since it is believed... more The polycentric city model has gained popularity in spatial planning policy, since it is believed to overcome some of the problems often present in monocentric metropolises, ranging from congestion to difficult accessibility to jobs and services. However, the concept ‘polycentric city’ has a fuzzy definition and as a result, the extent to which a city is polycentric cannot be easily determined. Here, we leverage the fine spatio-temporal resolution of smart travel card data to infer urban polycentricity by examining how a city departs from a well-defined monocentric model. In particular, we analyse the human movements that arise as a result of sophisticated forms of urban structure by introducing a novel probabilistic approach which captures the complexity of these human movements. We focus on London (UK) and Seoul (South Korea) as our two case studies, and we specifically find evidence that London displays a higher degree of monocentricity than Seoul, suggesting that Seoul is likely...

Successes tend to accrue to people who have been successful before. Two mechanisms can explain th... more Successes tend to accrue to people who have been successful before. Two mechanisms can explain the relationship between past and present success. Pre-existing differentiation along fitness dimensions may repeatedly direct successes toward certain subpopulations. Alternatively, success may breed success through positive feedback. Observational studies have not been able to evidence the operation of a success-breeds-success mechanism because correlations between successes in longitudinal records may also be produced by unobserved fitness advantages. To overcome this problem of empirical confounding, we conducted randomized experiments by intervening in four live social systems across the domains of funding, status, social support, and reputation. In each system we consistently found that bestowed success upon arbitrarily selected recipients i This research was supported by NSF Award 1303522 (A.v.d.R. & M.R.), was approved by the SBU Human Subjects Committee (ID numbers #373335, #36664...

Camille Roth, 2 Soong Moon Kang, Michael Batty, and Marc Barthelemy 5 CAMS (CNRS/EHESS) 190, aven... more Camille Roth, 2 Soong Moon Kang, Michael Batty, and Marc Barthelemy 5 CAMS (CNRS/EHESS) 190, avenue de France, F-75013 Paris, France Inst. Sys. Complexes Paris-Ile de France (ISC-PIF), 57-59 rue Lhomond, F-75005 Paris, France roth@ehess.fr Department of Management Science and Innovation University College London (UCL), Gower Street, London WC1E 6BT, UK smkang@ucl.ac.uk Centre for Advanced Spatial Analysis (CASA) University College London (UCL), 90 Tottenham Court Road, London W1N 6TR, UK m.batty@ucl.ac.uk Institut de Physique Théorique CEA, IPhT, CNRS-URA 2306, F-91191 Gif-sur-Yvette, France marc.barthelemy@cea.fr

1Institute of Mathematics and Computer Sciences (ICMC), University of São Paulo (USP), São Carlos... more 1Institute of Mathematics and Computer Sciences (ICMC), University of São Paulo (USP), São Carlos, Brazil 2Department of Computer Science, University College London, Gower Street, London, WC1E 6BT, UK 3School of Management, University College London, Gower Street, London, WC1E 6BT, UK 4Institute for Systems and Computer Engineering, Technology and Science, University of Porto (UP), Porto, Portugal 5Laboratory of Technology and Innovation (LATIN), Federal Institute of South of Minas Gerais (IFSULDEMINAS), Poços de Caldas, Brazil *douglas.braz@ifsuldeminas.edu.br +these authors contributed equally to this work

We take advantage of an extensive data set composed of social media messages related to DJIA inde... more We take advantage of an extensive data set composed of social media messages related to DJIA index components to investigate the relation between social media and financial markets network structure. Results suggest that social media attention persistence might lead stock market stability. Moreover, the social media structure has a considerable similarity with the stock market yet having higher persistence. In future work, we plan to use correlation-based graphs and network filtering tools to analyse the multiplex structure of social media and financial networks.

We draw on theories of personality and social capital to examine how they affect employee intrapr... more We draw on theories of personality and social capital to examine how they affect employee intrapreneurship. If organizations are to continue to grow, innovate and deliver value, they need to encour...

The paper addresses the classical network tomography problem of inferring local traffic given ori... more The paper addresses the classical network tomography problem of inferring local traffic given origin-destination observations. Focussing on large complex public transportation systems, we build a scalable model that exploits input-output information to estimate the unobserved link/station loads and the users path preferences. Based on the reconstruction of the users' travel time distribution, the model is flexible enough to capture possible different path-choice strategies and correlations between users travelling on similar paths at similar times. The corresponding likelihood function is intractable for medium or large-scale networks and we propose two distinct strategies, namely the exact maximum-likelihood inference of an approximate but tractable model and the variational inference of the original intractable model. As an application of our approach, we consider the emblematic case of the London Underground network, where a tap-in/tap-out system tracks the start/exit time an...

... Camille Roth,1, 2 Soong Moon Kang,3 Michael Batty,4 and Marc Barthélemy1, 5 1CAMS (CNRS/EHESS... more ... Camille Roth,1, 2 Soong Moon Kang,3 Michael Batty,4 and Marc Barthélemy1, 5 1CAMS (CNRS/EHESS) 54, boulevard Raspail F-75006 Paris ... We utilize here in an unprecedented manner the large scale, real-time 'Oyster' card database of individ-ual person movements in the ...

We consider problems in which a system receives external \emph{perturbations} from time to time. ... more We consider problems in which a system receives external \emph{perturbations} from time to time. For instance, the system can be a train network in which particular lines are repeatedly disrupted without warning, having an effect on passenger behavior. The goal is to predict changes in the behavior of the system at particular points of interest, such as passenger traffic around stations at the affected rails. We assume that the data available provides records of the system functioning at its "natural regime" (e.g., the train network without disruptions) and data on cases where perturbations took place. The inference problem is how information concerning perturbations, with particular covariates such as location and time, can be generalized to predict the effect of novel perturbations. We approach this problem from the point of view of a mapping from the counterfactual distribution of the system behavior without disruptions to the distribution of the disrupted system. A var...

2017 International Conference on Indoor Positioning and Indoor Navigation (IPIN), Sep 1, 2017

Lecture Notes in Computer Science, 2017

Revista de Administração de Empresas

Academy of Management Proceedings, 2013