Big data analytics and visualization with spatio-temporal correlations for traffic accidents

Big data analytics for traffic accidents is a hot topic and has significant values for a smart and safe traffic in the city. Based on the massive traffic accident data from October 2014 to March 2015 in Xiamen, China, we propose a novel accident occurrences analytics method in both spatial and temporal dimensions to predict when and where an accident with a specific crash type will occur consequentially by whom. Firstly, we analyze and visualize accident occurrences in both temporal and spatial view. Second, we illustrate spatio-temporal visualization results through two case studies in multiple road segments, and the impact of weather on crash types. These findings of accident occurrences analysis and visualization would not only help traffic police department implement instant personnel assignments among simultaneous accidents, but also inform individual drivers about accident-prone sections and the time span which requires their most attention.

Association between perception of fault for the crash and function, return to work and health status 1 year after road traffic injury: a registry-based cohort study

Objectives To establish the association between the patient's perception of fault for the crash and 12-month outcomes after non-fatal road traffic injury.Setting Two adult major trauma centres, one regional trauma centre and one metropolitan trauma centre in Victoria, Australia.Participants 2605 adult, orthopaedic trauma patients covered by the state's no-fault third party insurer for road traffic injury, injured between September 2010 and February 2014.Outcome measures EQ-5D-3L, return to work and functional recovery (Glasgow Outcome Scale—Extended score of upper good recovery) at 12 months postinjury.Results After adjusting for key confounders, the adjusted relative risk (ARR) of a functional recovery (0.57, 95% CI 0.46 to 0.69) and return to work (0.92, 95% CI 0.86 to 0.99) were lower for the not at fault compared to the at fault group. The ARR of reporting problems on EQ-5D items was 1.20–1.35 times higher in the not at fault group. Conclusions Patients who were not at fault, or denied being at fault despite a police report of fault, experienced poorer outcomes than the at fault group. Attributing fault to others was associated with poorer outcomes. Interventions to improve coping, or to resolve negative feelings from the crash, could facilitate better outcomes in the future.

Black and white is always grey-the power of the police to conduct a strip search in Victoria

The performance of a strip search by a police officer is a serious interference with the liberty and dignity of an individual. However, it is considered by police to be an important part of their law enforcement armory and one that is increasingly necessary to utilise to assist in the investigation and prosecution of drug-related crimes. This article considers the troublesome issue of whether and in what circumstances the common law may extend to police the power to conduct a strip search. In addition, there is an examination of the statutes and regulations that purportedly give police in Victoria the power to strip search with particular attention given to ss 81 and 82 of the Drugs, Poisons and Controlled Substances Act 1981 (Vic).

Police perceptions of interviews involving children with intellectual disabilities: a qualitative inquiry

This study employed a qualitative method to explore the experiences of 20 police officers when interviewing children with intellectual disabilities. Three main themes were interpreted as representing challenges to the officers when interviewing special-needs children: police organizational culture, participants' perceptions of these children as interviewees, and prior information. Participants in this inquiry mentioned poor organizational priority within the police force for child abuse cases and children with intellectual disabilities, as well as inadequate support for interviewing skills development and maintenance. Participants also attempted to equalize these children by interviewing them in the same way as their mainstream peers. Finally, participants viewed interview preparation as influential in determining an interview's successful outcome, but recognized that preparedness could bias their interviewing techniques. Increased attention towards these issues will provide a basis for developing strategies to minimize such challenges and thus improve the quality of interviews with children with intellectual disabilities.

The trouble with woon: the selective answering of police questions and the right to pre-trial silence

The 1964 High Court decision in Woon v The Queen is commonly understood to permit the drawing of an inference of a ‘consciousness of guilt’ when a suspect selectively responds to police questions. It is the author’s contention that, in the light of the emphatic endorsement of the right to pre-trial silence by the High Court in 1993 in Petty v The Queen; Maiden v The Queen, Woon should now be regarded as bad law and should no longer be followed.

Child abuse investigation: an in depth analysis of how police officers perceive and cope with daily work challenges

Purpose: The purpose of the current study was two-fold: to explore police officers' perceptions of the daily challenges involved in child abuse investigation and how those challenges affect their ability to undertake child abuse investigations, and to explore how these challenges are managed on a daily basis. Design/methodology/approach: This study employed a qualitative research design. In-depth interviews were conducted with a diverse sample of 25 police officers working in child abuse units across three Australian states. Findings: Inductive thematic analysis revealed that heavy caseload and collaboration with other professional groups are two key sources of negative work stress frequently associated with child abuse investigation. Further, despite the provision of organisational strategies aimed at reducing work stress, the officers tended to rely predominantly on informal coping mechanisms.  Research limitations/implications: This study has raised many questions for further research aimed at developing interventions to assist police organisations in managing work stress. Originality/value: This paper provides an in-depth analysis of the key challenges associated with child abuse investigation and the coping mechanisms employed for overcoming these challenges from the unique perspective of police officers authorised to investigate child abuse.

Police officers' and legal professionals' perceptions regarding how children are, and should be, questioned about repeated abuse

This study explored the perceptions of police officers and legal professionals (i.e., prosecutors, defence lawyers and a judge) about (a) what particularisation is, (b) the type of information that is required for particularisation to occur, and (c) how particularisation is best achieved in cases of repeated child abuse. The professionals' perceptions (all experts in this area) were elicited via individual in-depth semi-structured interviews. While all participants acknowledged the importance of particularisation, the views of the police officers varied in several important ways to those of the other professionals. Overall, the police officers perceived that highly specific details (such as the location, date and time of the offence) are essential for particularisation to occur, and that maximising the number of separate offences and specific details about each offence increases the chance of successful prosecution. In contrast, the legal professionals perceived that the primacy goal of the police officers should be to elicit a free-narrative account of one or more offences. A high proportion of specific questions was perceived to negatively impact on the child's credibility by contaminating the evidence. The implications of these findings are discussed.

A simulation model for video traffic performance via ATM over TCP/IP

Although TCP has emerged as the standard in data communication, the introduction of ATM technology has raised numerous problems regarding the effectiveness of using TCP over A TM networks, especially when video traffic performance is considered. This paper presents a simulation model for transmission performance of video traffic via ATM over TCP/IP. The interactivity between TCP/IP and ATM, generation of MPEG traffic and evaluation of traffic performance are implemented in the model. The design and implementation details of the model are carefully described. The experiments conducted using the model and experimental results are briefly introduced, revealing the capability of our model in simulating network events and in evaluating potential solutions to performance issues.

MPEG Traffic Performance via TCP over ATM

A large volume of TCP/IP traffic is currently, and in the future will be, carried over ATM networks. A major part of the traffic, which is produced by multimedia sources, is encoded using the MPEG standard. For the performance analysis of transferring MPEG video sequence via TCP/IP over A TM networks, there is a need for appropriate simulation models. This paper describes one such simulation model that we have constructed. A sct of preliminary simulation experiments have been conducted with the mode to assess the impact of different network configurations on the MPEG traffic transmission performance. Our simulation model is able to simulate many of the potential performance issues regarding video traffic via TCPIIP and A TM and can be used to evaluate any potential solutions.

A performance comparison of three wireless multi hop ad-hoc network routing protocols when streaming MPEG4 traffic

Mobile ad-hoc networks are characterised by constant topology changes, the absence of fixed infrastructure and lack of any centralised control. Traditional routing algorithms prove to be inefficient in such a changing environment. Ad-hoc routing protocols such as dynamic source routing (DSR), ad-hoc on-demand distance vector routing (AODV) and destination-sequence distance vector (DSDV) have been proposed to solve the multi hop routing problem in ad-hoc networks. Performance studies of these routing protocols have assumed constant bit rate (CBR) traffic. Real-time multimedia traffic generated by video-on demand and teleconferencing services are mostly variable bit rate (VBR) traffic. Most of these multimedia traffic is encoded using the MPEG standard. (ISO moving picture expert group). When video traffic is transferred over MANETs a series of performance issues arise. In this paper we present a performance comparison of three ad-hoc routing protocols - DSR, AODV and DSDV when streaming MPEG4 traffic. Simulation studies show that DSDV performs better than AODV and DSR. However all three protocols fail to provide good performance in large, highly mobile network environments. Further study is required to improve the performance of these protocols in mobile ad-hoc networks offering VBR services.

Predictors of wellbeing experienced by Australian police officers

The aim of this study was to assess the ability of the Demand-Control-Support (DCS) model as well as the psychological contract model (PCM) to predict the wellbeing experienced by 2,566 Australian police officers. While the level of explained variance attributed to the PCM was substantially less than the DCS, measures of contract breach and organisational fairness still captured significant portions of intrinsic and extrinsic job satisfaction. Overall, the results of this study suggest that both the DCS and the PCM should figure prominently in strategies aimed at reducing or preventing police stress.

What makes a good investigative interviewer of children? A comparison of police officers' and experts; perceptions

Purpose – The purpose of this paper is to examine police officers’ perceptions about their role in interviewing children, and to compare these perceptions with those of child eyewitness memory experts.

Design/methodology/approach – A diverse sample of 23 police officers (from three states of Australia) individually participated in in-depth interviews where they were asked to define what makes a good interviewer in the area of child abuse investigation.

Findings – Irrespective of the background of the officers, the important role of interviewers’ personal attributes was emphasised (e.g. having a relaxed, empathetic, warm nature). Such personal attributes were more prominent in the participants’ descriptions than knowledge of legislation and children’s
development, prior job experience, and interviewing techniques.

Research limitations/implications – The paper shows that while child eyewitness memory experts acknowledge the importance of establishing a bond of mutual trust between the interviewer and the child, the importance of utilising an open-ended questioning style for enhancing rapport, and
for eliciting a detailed and accurate account of abuse cannot be overstated. The possible reasons for the police officers’ emphasis on personal qualities are discussed.

Originality/value – This paper has revealed that limitations in the competency of police officers in interviewing children is not merely a problem of “doing” (i.e. learning to ask open-ended questions),
but may also reflect ingrained attitudinal and organisational barriers.