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Artikel

Veilig uitgaan: tegenstrijdige gevoelens over inzet politie en andere maatregelen

Tijdschrift Tijdschrift voor Veiligheid, Aflevering 4 2017
Trefwoorden tegenstrijdigheden, assemblage, angst voor criminaliteit, uitgaansgebieden, veiligheidsbeleving
Auteurs Jelle Brands en Irina van Aalst
SamenvattingAuteursinformatie

    Urban nightlife areas are widely renowned for their emotionally charged nature, affording greater opportunities for transgressions of social norms compared to daytime contexts. Yet, the ways nightlife consumers experience safety in the public spaces of nightlife areas has received limited attention in the academic literatures. This article approaches experienced safety in the public spaces of nightlife areas as emerging from encounters between human and non-human (material, social, cultural) elements grounded in time and space. Such elements include the characteristics of the built environment, the design of public space, police presence, lighting and also first and secondhand experiences and popular media discourses more generally. We hypothesized that encounters between such elements necessarily renders some ambiguity in experienced safety, in the sense that the effect of a particular element on experienced safety is always coproduced in the unfolding encounter. By drawing on a series of interviews with Dutch students in Utrecht, various types of ambiguity are shown to exist depending on both the particularities of the situation at hand and based on differences between individual circumstance and life course. Ambiguity is also shown to exist in the sense that mentioned elements may both comfort and alarm participants at the same time. Our findings infer that we should implement ‘safer nightlife’ initiatives that are tailored to particular contexts, situations and publics. The results also suggest that current interventions seeking to stimulate safety in urban nightlife settings might not be as successful in reducing/enhancing (un)safety as (popular) policy and media discourses have suggested.


Jelle Brands
Jelle Brands is universitair docent aan het Instituut voor Strafrecht & Criminologie van de Faculteit der Rechtsgeleerdheid aan de Universiteit Leiden.

Irina van Aalst
Irina van Aalst is universitair docent aan het departement Sociale Geografie en Planologie van de Faculteit Geowetenschappen, Universiteit Utrecht.
Artikel

Automatische gedragsanalyse voor effectiever cameratoezicht in de openbare ruimte

Tijdschrift Tijdschrift voor Veiligheid, Aflevering 4 2014
Trefwoorden Behavior analysis, Threat detection, Action recognition, Tracking, Re-identification
Auteurs Dr. Henri Bouma, Drs. Jeroen van Rest, Dr. ir Gertjan Burghouts e.a.
SamenvattingAuteursinformatie

    To improve security in crowded environments, such as airports, shopping malls and railway stations, the number of surveillance cameras (CCTV) is rapidly increasing. However, the number of human operators remains limited and only a selection of the video streams can be observed. This makes it hard for an operator to be proactive. This paper gives an overview of novel developments that may lead to more efficient camera surveillance and a more proactive role for camera operators. It focuses on three main steps in this process of video content analysis: pedestrian tracking, action recognition and behavior analysis. Tracking and re-identification (i.e. recognizing a person in another camera) was initially only evaluated on off-line benchmark datasets, though recently it has gained in maturity with live demonstrations in realistic crowded environments and measured improved operator efficiency. For action recognition and automatic behavior recognition, we observe that the simple patterns, such as loitering detection, are emerging in many applications. Human action recognition obtains very high performance values in controlled environments and it is progressing towards more realistic environments. More advanced approaches, such as pickpocket recognition in a shopping mall and the detection of threats to trucks on a parking lot have been developed and the first systems have been presented in live demonstrations. Our main contribution is that we structure the recent advances and the emerging applications of video analysis for security applications, explain and interpret the results, and identify opportunities for the near future.


Dr. Henri Bouma
Dr. Henri Bouma is research scientist bij TNO.

Drs. Jeroen van Rest
Drs. Jeroen van Rest is consultant bij TNO.

Dr. ir Gertjan Burghouts
Dr. ir. Gertjan Burghouts is research scientist bij TNO.

Dr. Klamer Schutte
Dr. Klamer Schutte is research scientist bij TNO.

Ir. Jan Baan
Ir. Jan Baan is research scientist bij TNO.

Jeroen van der Heijden
Dr. Jeroen van der Heijden is als assistant professor verbonden aan de Faculteit der Rechten van de Universiteit van Amsterdam en the Regulatory Institutions Network (RegNet) van de Australian National University. E-mail: j.j.vanderheijden@anu.edu.au
Artikel

Twitter tijdens flitscrises

Een onderbenut potentieel?

Tijdschrift Tijdschrift voor Veiligheid, Aflevering 4 2012
Trefwoorden Twitter, flash crises, crisis communication, Moerdijk, social media
Auteurs Jelle Groenendaal, Martine de Bas en Ira Helsloot
SamenvattingAuteursinformatie

    By pointing to the immense use of Twitter by citizens during crises, communication experts argue that governments should participate more actively on Twitter during crises. Until now, however, little empirical research has been conducted to validate this claim. This article aims at validating this claim and putting forward building blocks for an evidence-based vision on the use of Twitter by governments during flash crises, i.e. large-scale incidents that occur unexpectedly and immediately. The authors analysed 52.806 tweets sent by citizens and governments during a large-scale industrial fire in Moerdijk (2011). They looked at the content of the tweets and sorted them into fourteen categories. The results show that most of the tweets sent by citizens contained no new or relevant information for governments. In addition, the tweets sent by governments were totally ‘snowed under’ in the huge stream of tweets from citizens. Consequently, the tweets sent by governments were very little re-tweeted by Twitter users. The authors conclude that the Moerdijk case does not show a need for a more proactive role of governments on Twitter.


Jelle Groenendaal
Jelle Groenendaal MSc is onderzoeker bij Crisislab en promovendus aan de Radboud Universiteit Nijmegen. E-mail: j.groenendaal@crisislab.nl

Martine de Bas
Martine de Bas MSc is adviseur crisisbeheersing en veiligheid bij de gemeente Papendrecht. E-mail: EM.de.bas@papendrecht.nl

Ira Helsloot
Prof. dr. Ira Helsloot is hoogleraar Besturen van Veiligheid aan de Radboud Universiteit Nijmegen en voorzitter van stichting Crisislab. E-mail: i.helsloot@crisislab.nl
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