A Quantitative Network-Based Study in the Visualisation and Suppression of Illicit Drug Networks in the UK

我提出的博士论文的目的是为研究非法毒品网络供应方的现有文献做出贡献，并利用英国司法部新颖的“数据第一”，为在英国境内打击毒品供应网络操作提供政策制定建议。本文分为三个部分。第一部分由进行探索性研究的两篇文章组成，其中第一部分通过对被捕个人之间的案件编号进行匹配，以识别跨越时间和地理区域的同谋者，从而将异质毒品供应集团所覆盖的区域可视化。然后，可视化将通过每个组内的内部层次进一步分解（使用来自案件报告的数据组合来确定犯罪的严重程度和登记的共同犯罪者的数量），并跨异质药物类型来调查供应网络结构的差异。第二部分从规范影响的角度评估了共同犯罪与累犯之间的因果机制。其目的是通过针对早期犯罪生涯中的负面规范影响来评估制定替代政策以抑制毒品供应网络的可行性，从而减少再犯，从而减少毒品供应商的供应。第三部分最后评估了不同类型毒品犯的异质刑对累犯的相对效果

The purpose of my proposed PhD thesis is to contribute to the existing literature studying the supply side of the illicit drug networks, and to provide policy setting suggestions in suppressing the drug-supply network operations within the UKusing the novel "Data First" from the UK Ministry of Justice. The thesis is split into three sections. The first section is composed of two articles carrying out exploratory studies, whereby the first visualises the regions covered byheterogenous drug-supplying groups through the matching of case-IDs between arrested individuals to identify cooffenders across both time and geographical regions. The visualisation will then be further disaggregated by internalhierarchy within each group (identified using a combination of data from the case report denoting the severity of crime and the number of registered co-offenders), and across heterogenous drug-types to investigate the differences in thesupply network structure. The second section assesses the causal mechanisms between co-offending and recidivism from a normative influence perspective. The purpose is to evaluate the plausibility of alternative policy setting insuppressing drug-supply networks by targeting negative normative influences in early criminal careers in order to reduce recidivism, and thus the supply of drug-suppliers. The third section concludes by assessing the relative efficacy ofheterogenous criminal punishments on recidivism among different drug-supplying offenders