new naaja darwin office · new naaja darwin office officially opened by attorney-general the hon...

A modified version of this technical report will appear in ACM Computing Surveys, September 2009. Anomaly Detection : A Survey VARUN CHANDOLA University of Minnesota ARINDAM BANERJEE University of Minnesota and VIPIN KUMAR University of Minnesota Anomaly detection is an important problem that has been researched within diverse research areas and application domains. Many anomaly detection techniques have been specifically developed for certain application domains, while others are more generic. This survey tries to provide a structured and comprehensive overview of the research on anomaly detection. We have grouped existing techniques into different categories based on the underlying approach adopted by each technique. For each category we have identified key assumptions, which are used by the techniques to differentiate between normal and anomalous behavior. When applying a given technique to a particular domain, these assumptions can be used as guidelines to assess the effectiveness of the technique in that domain. For each category, we provide a basic anomaly detection technique, and then show how the different existing techniques in that category are variants of the basic technique. This template provides an easier and succinct understanding of the techniques belonging to each category. Further, for each category, we identify the advantages and disadvantages of the techniques in that category. We also provide a discussion on the computational complexity of the techniques since it is an important issue in real application domains. We hope that this survey will provide a better understanding of the different directions in which research has been done on this topic, and how techniques developed in one area can be applied in domains for which they were not intended to begin with. Categories and Subject Descriptors: H.2.8 [Database Management]: Database Applications— Data Mining General Terms: Algorithms Additional Key Words and Phrases: Anomaly Detection, Outlier Detection 1. INTRODUCTION Anomaly detection refers to the problem of finding patterns in data that do not conform to expected behavior. These non-conforming patterns are often referred to as anomalies, outliers, discordant observations, exceptions, aberrations, surprises, peculiarities or contaminants in different application domains. Of these, anomalies and outliers are two terms used most commonly in the context of anomaly detection; sometimes interchangeably. Anomaly detection finds extensive use in a wide variety of applications such as fraud detection for credit cards, insurance or health care, intrusion detection for cyber-security, fault detection in safety critical systems, and military surveillance for enemy activities. The importance of anomaly detection is due to the fact that anomalies in data translate to significant (and often critical) actionable information in a wide variety of application domains. For example, an anomalous traffic pattern in a computer To Appear in ACM Computing Surveys, 09 2009, Pages 1–72.

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Page 1: New NAAJA Darwin office · New NAAJA Darwin office officially opened by Attorney-General the Hon Robert McClelland MP and NAAJA Chairperson Dorothy Fox Friday 2nd S8pt0mb6r 2011 /yon

New NAAJA Darwin officeofficially opened by Attorney-General the Hon Robert McClelland MP and NAAJA Chairperson Dorothy FoxFriday 2nd S8pt0mb6r 2011 /yon f^0pert McLelland MP, NAAJA Chairperson Ms Dorothy Fox, NAAJA

Deputy Chairperson Mr Norman George with the “One Mob, Different Country Dancers”.

Priscilla CollinsChief Executive OfficerNorth Australian Aboriginal Justice Agency

The North Australian Aboriginal Justice Agency (NAAJA) Darwin office was officially opened on 1st September

2011 by Attorney-General the Hon Robert McClelland MP and NAAJA Chairperson Dorothy Fox.

Dorothy Fox opened the evening with a welcome to country which was followed by the Attorney- General welcoming everyone to the event and acknowledging the hard work and dedication NAAJA delivers to Aboriginal people in the Top End of the Northern Territory.

We were very privileged to have the One Mob, Different Country dancers perform for the guests at the opening. NAAJA then held a smoking ceremony with Roxy who explained the importance to smoke the new building.

The opening was an exciting evening for NAAJA, which has grown in recent years to become the largest legal practice in the Northern Territory. In addition to the work we do in criminal, civil and

family law, we have also expanded our services to include a range of positive initiatives to promote justice for Aboriginal people, including Prisoner Throughcare, Prison Support and Community Legal Education.

We were very pleased to be joined at the opening by the the Hon Chief Justice Trevor Riley, the Hon Justice Peter Barr, Chief Magistrate Hilary Hannam and Magistrates Sue Olliver and Elizabeth Morris, Police Commissioner John McRoberts, CEO of the Department of Justice Greg Shannahan, Director of the NT Legal Aid Commission Suzan Cox QC, and many colleagues from the legal profession who have worked with and for Aboriginal legal services in the Top End, including Colin McDonald QC.

It was also a night for us to recognise the contribution of our family, friends and supporters in the community to the important work we do.

NAAJA has existed since 1 February 2006, following the merger of the three existing Aboriginal Legal Services in the Top End - NAALAS in Darwin, KRALAS in Katherine and Miwatj in Nhulunbuy. We had long outgrown our old Darwin offices at 1 Gardiner Street, into which NAALAS had moved in 1981. With the support of the Commonwealth Attorney- General and the Aboriginal Benefits Account, we were able to purchase our new Darwin office. Many practitioners will remember it as the old Cridlands building (or going further back, the old AMP building, opened in 1969).

NAAJA Chairperson, Dorothy Fox, said of the opening: ‘We are extremely pleased to officially open our new NAAJA Darwin office. NAAJA has a dynamic and talented team of lawyers and staff who continue to work towards gaining justice for Aboriginal people and keeping their culture, tradition and law strong’.

Balance 4/2011 | 25

Throughcare in the Territory: small steps to big change Jared Sharp Advocacy Manager NAAJA [email protected]

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