This research evaluates crime prevention effects/impact of open-street closed circuit television (CCTV) surveillance systems as installed in the selected areas (research sites) of the cities of Johannesburg and Tshwane in the Gauteng Province of South Africa on crimes occurring in these surveilled areas. Currently, CCTV surveillance systems are a common sight in many of the urban areas of South Africa.The principal aim of this study was to explore the evaluation of CCTV for crime prevention, reduction and control. The results show that, despite a lack of empirical evidence as to the value of CCTV surveillance systems in preventing or reducing crime, there is strong public support for these systems and that the foundation for much of this support lies in the perceptions/feelings of members of the public of greater safety generated in areas with CCTV coverage. The method of sampling used was a purposive non-probability sampling approach. Participants were selected for interviews based on their knowledge and experience of CCTV systems. The results show that, despite this lack of empirical evidence, CCTV appears to be a viable option for crime prevention and control when integrated with evidence-based strategies rather than as a stand-alone tactic in order to achieve crime control benefits. / Criminology and Security Science / M. Tech. (Security Management)

鑒於科技建警時代來臨，錄影監視系統運用範圍越來越廣泛，加上媒體大幅報導使用成效，導致新增議題持續不斷發生。本文先以預防犯罪角度探究錄影監視系統建置成因、運用及維護管理模式，取臺北市12個行政區2005年至2015年間各式刑案發生數，採竊盜案件發生數、強盜搶奪案件發生數及違反偽造文書印文案件發生數為被解釋變數，其中對照組為偽造文書印文案件發生數，監視器總數量為主要解釋變數，輔以守望相助組織、員警人數等與警政業務相關及多數犯罪實證研究文獻較常使用之解釋變數，從縱斷面及橫斷面的資料進行觀察，再透過「追蹤資料」（Panel Data）並運用「最小平方法」（Ordinary least squares,OLS）、固定效果模型及隨機效果模型進行資料分析，評估錄影監視系統數量配置上差異是否與刑案發生數有顯著關聯，藉以探討錄影監視系統建置數量多寡對於治安影響的程度。 研究發現，根據最小平方法的估計，監視器總數量與竊盜案件發生數呈負的顯著關聯，與強盜搶奪案件發生數及偽造文書印文案件發生數則無顯著關聯，顯示錄影監視系統僅對於特定類型刑案發生有犯罪預防效果，運用錄影監視系統雖然有利於破獲強盜搶奪案件，但在預防強盜搶奪案件發生效果並不顯著，同時驗證臺北市在錄影監視系統數量分配上並非僅以轄區人口數、土地面積及暴力、竊盜案件平均發生數為基礎。最後，本研究建議警政機關在錄影監視系統配置上應視影響刑案發生數之因素分配，如做整體預防犯罪決策應多考慮其他社會因子，在未來設置時，應適時變更宣導方向提高民眾治安滿意度，並針對系統設備有效管理維護，因時因地制宜，經由整合公私部門提高覆蓋率，以減少治安死角。 / In view of the coming of technical police age, the Closed-circuit television （CCTV） is applied more and more broadly. With the greatly reported effects by the press, new issues keep emerging. This article discovers the coming reasons, application and managed modes behind CCTV. We adopt the statics of the offense known to the police, larcenies, forceful taking and forgery from 2005 to 2015 among 12 districts in Taipei City as the dependent variable, the number of the forgery as the control group, and the number of monitors as the main response variable. We also take commonly used response variables in mutual help organizations, the number of the relevant police duties , and research papers of criminal evidence to observe the information vertically and horizontally , then conduct data analysis via Panel Data, Ordinary Least Squares （OLS）, Fixed Effect Model and Random Effect Model and estimate if there’s connection between the number of CCTV and criminal cases to see if the number of CCTV and has any impact on the public order. The research shows that the number of CCTV has significantly negative relevance with the larcenies, while forceful taking and forgery go opposite, according to the estimation of OLS. It shows that CCTV has positive influence on criminal prevention only to certain criminal cases. CCTV is benefit busting forceful taking, but not preventing it. Nevertheless, it proves that the distribution of CCTV in Taipei City isn’t just based on the district population, area, violence and the avg. number of force taking simultaneously. Finally, we suggest that Police Agency & Subordinate Branch allot CCTV depending on the factors of criminal cases. For example, considering more sociocultural factor when making decisions about criminal prevention and changing the ways of propaganda timely to improve the public order satisfaction. Furthermore, managing and maintaining system facilities effectively and change tactics as the situation and time demand to reduce the high crime rates by integrating public and private sectors and higher coverage.

中文摘要 近年來治安問題日益受到重視，錄影監視系統之設置也成為改善治安的重要策略之一，臺北市里長以裝設錄影監視系統作為預防犯罪的重要政見，致里鄰監視器大幅成長甚至達全國之冠。里長無公權力且缺乏維管監視系統之專業力，為解決里辦公處設置之錄影監視系統大幅成長衍生纜線附掛凌亂、維修經費不足及隱私權等問題，臺北市政府決定整合並移轉警察局專業管理。 本研究以網絡政策治理的觀點分析臺北市錄影監視系統建置政策決策，探討里鄰錄影監視系統產生治安與資訊隱私難以兼顧之政策弔詭。個案聚焦於臺北市錄影監視系統之整合過程相關利害關係人意見，期能回顧建置過程相關問題並針對現況缺失提出改進之策。 本研究以立意抽樣的方式選定臺北市錄影監視系統整合期間實務運作者進行深度訪談，並蒐集官方機構有關臺北市錄影監視系統建置相關資料，兼採文獻分析法及個案研究法以取得描述性資料。研究主要目的包含：(1)探討臺北市里長建置管理錄影監視系統產生的問題；(2)探討臺北市錄影監視系統整合政策決策過程；(3)依據研究結果提供建置錄影監視系統相關建議及公部門如何與民力合作改善治安之未來方向。 研究結果如下：(1)人民重視治安甚於隱私；(2)里長沒有公權力不適合管理監視器；(3)里長建置之錄影監視系統機器老舊廠牌規格各異，警察局無法以接收方式整合；(4)新系統設置點位經警察局以治安專業評估，移轉過程難以配合里長一支換一支的期待；(5)利害關係人意見往往沒有那麼客觀；(6)警力有限民力無窮，以中長期而言整合社區資源結合民力協助警力為重要的未來方向。 而針對上述的研究發現，本研究提出三點建議：第一、維護治安應凝聚社區認同；第二、應加強風險管理及危機處理能力；第三、落實民間設置錄影監視系統之管理。 / Abstract Recently, the public security is a significant issue concerned by government. Setting the closed-circuit television (CCTV) system is one of the strategies for improving the public security. Village chiefs in Taipei have an important political view: To set neighborhood CCTV for crime prevention. As the result of that, the number of neighborhood CCTV in Taipei is the top in Taiwan. However, the village chiefs have neither public right nor the specialty for maintain the CCTV system. In order to conquer the problems: messy cables, lack of funds and privacy issues caused from the neighborhood CCTV, the Taipei City Government make a decision to shift the management rights to the police department. From my studies, I analyze the policy of Taipei CCTV and search for the community safety and privacy issues caused by the neighborhood CCTV. My research cases focused on the related-stakeholders’ opinions to the processing of Taipei CCTV integration. As we focus on that, we can propose better policies to improve the problems we have now. I chose purposive sampling as the way to select the workers in Taipei CCTV integration processing to have in-depth interviews. Moreover, I collected some information of Taipei CCTV from government resources and used literature review methodology with case review to have a descriptive research. The main propose of my studies including (1) To investigate the problems from the setting of CCTV by village chiefs. (2) To verify the processing of making Taipei CCTV integration policy. (3) To give some suggestions about how government and citizens work together to improve the community security in the future. Result as below: (1) Citizens thought security is more important than privacy. (2) Village chiefs aren’t suitable to manage the CCTV because they have no public right to do that. (3) It is difficult for police department to integrate the CCTV system because the monitors were old and the brands of CCTV were different. (4) The new CCTV system from police department is difficult to meet the every requirement from village chiefs. (5) The Opinions from related-stakeholders are not quite objective. (6) The number of police is limited. Thus, it is important to combine the citizen and police together to improve the public security. As follows, I have three recommendations. First, we need to agglomerate social identity to maintain the public security. Second, we need to improve the abilities on risk management and crisis handling. Third, we need to manage the setting of CCTV system.

Aging sewer infrastructure is posing greater and greater risk to the health and well-being of City residents. Issues can range from pipe blockages in sewer laterals to Sanitary Sewer Overflows. This thesis develops a risk analysis method that can be used by municipalities to maintain and rehabilitate sewer assets. Risk combines the effect of Likelihood of Failure (LOF) and Consequence of Failure (COF) to perform a complete two-dimensional analysis that allows for relative comparison between different pipes in the system. The LOF rating has been equated to pipe integrity while the COF rating was related to the environmental, economic, and social consequences to pipe failure. In order to estimate pipe integrity Closed Circuit Television (CCTV) scores from the City of Santa Barbara were used in combination with spatial and physical properties associated with each pipe. The CCTV scores were simply integer values between 0 and 5 based on the National Association of Sewer Services Company’s (NASSCO) Pipeline Assessment Certification Program (PACP) results. The quantitative parameters included pipe material and age, distance from restaurants, distance from any above ground water source, pipe depth below the ground surface, pipe length, and vehicular traffic volumes. The sensitivity analysis compared the given structural integrity scores with the predicted scores based on the weighted scoring method. It isolated four out of six of the parameters tested that affected the structural integrity of sewer pipes: material and age (45%), pipe depth (20%), Vehicular Traffic (10%), and distance from an above-ground water source (25%). A program was created in the C programming language that iteratively determined the percentage for each factor. These percentage factors are used to obtain the predicted structural integrity score for all the pipes. Like the LOF rating, the COF rating consisted of scores between 0 and 5. The COF rating used pipe diameter, distance from commercial zones, distance from critical infrastructure, and vehicular traffic volume as parameters for quantifying the environmental, economic, and social consequences. These factors were determined from review of past literature and given approximately equal weighting when determining the COF rating values. The environmental factor, pipe diameter, was given a percentage factor of 30%; the economic factor, distance to commercial zones, was given a percentage factor of 30%; and the social concerns, distance to critical infrastructure and vehicular traffic volume, were given percentage factors of 20% each. Finally, the risk for each pipe was determined in Geographic Information Systems (GIS) by combining the predicted structural integrity score or LOF rating and COF rating value for each pipe. This generated color-coded maps that showed distinct pipes that had the most critical predicted structural integrity scores, highest consequence, and the pipes with the most risk. This process could be used by any City to create a maintenance and rehabilitation schedule and plan for future CCTV inspections.