Individual Camera Identification Using Correlation of Fixed Pattern Noise in Image Sensors

Abstract:  This paper presents results of experiments related to individual video camera identification using a correlation coefficient of fixed pattern noise (FPN) in image sensors. Five color charge-coupled device (CCD) modules of the same brand were examined. Images were captured using a 12-bit monochrome video capture board and stored in a personal computer. For each module, 100 frames were captured. They were integrated to obtain FPN. The results show that a specific CCD module was distinguished among the five modules by analyzing the normalized correlation coefficient. The temporal change of the correlation coefficient during several days had only a negligible effect on identifying the modules. Furthermore, a positive relation was found between the correlation coefficient of the same modules and the number of frames that were used for image integration. Consequently, precise individual camera identification is enhanced by acquisition of as many frames as possible.     

Hair analysis for cocaine: factors in laboratory contamination studies and their relevance to proficiency sample preparation and hair testing practices

Since the introduction in 2001 of a urine-based detection method for recombinant erythropoietin (rHuEPO), transfusion-doping practices have regained interest. To address this problem, an efficient antidoping test designed to obtain direct proof of allogeneic blood transfusion was developed and validated. This test, based on flow cytometry analysis of red blood cell (RBCs) phenotypes, was used to determine the absence or the presence of numerous RBCs populations in a blood sample. A such, it may constitute a direct proof of an abnormal blood population resulting from homologous transfusion. Single-blind and single-site studies were carried out to validate this method as a forensic quality standard analysis and to allow objective interpretation of real cases. The analysis of 140 blood samples containing different percentages (0-5%) of a minor RBCs population were carried on by four independent analysts. Robustness, sensitivity, specificity, precision and stability were assessed. ISO-accredited controls samples were used to demonstrate that the method was robust, stable and precise. No false positive results were observed, resulting in a 100% specificity of the method. Most samples containing a 1.5% minor RBCs population were unambiguously detected, yielding a 78.1% sensitivity. These samples mimicked blood collected from an athlete 3 months after a homologous blood transfusion event where 10% of the total RBCs present in the recipient originated in the donor. The observed false negative results could be explained by differences in antigen expression between the donor and the recipient. False negatives were more numerous with smaller minor RBCs populations. The method described here fulfils the ISO-17025 accreditation and validation requirements. The controls and the methodology are solid enough to determine with certainty whether a sample contains one or more RBCs populations. This variable is currently the best indicator for homologous blood transfusion doping.     

主导报纸如何呈现两性

本文通过对主导报纸《人民日报》的一次小型社会性别监测,统计分析了该报人物报道、专访、图片和性别议题报道的状况,并结合与既往主导报纸社会性别监测结果的对比,指出主导报纸近年来的妇女报道并无明显改善,最突出的问题是忽视妇女和性别议题,通过使妇女“不在场”而固化了男性主导的话语权力格局。     

对生活噪声扰人行为实施警察行政管理与处罚的探讨

《治安管理处罚法》第58条对噪声扰人行为的处罚规定具有立法上的进步性,但欠缺执法申的易操作性。作为治安警察首先需要明确可以依据的关于社会生活噪声污染防治的法律规定包括哪些。相关法律条款规定不够完善与细致,干扰他人正常生活认定的主观性,收集生活噪声证据的技术欠缺,这些因素极易导致警察接手此类案件时难以实施处罚,从而影响执法主动性。对立法的修正,监测技术的配备,以及非诉讼的民事调解有助于社会生活中不和谐噪声的消除。     

我国省级政府政务公开监督保障机制的问题与完善

政务公开是实现透明政府的重要制度之一,政务公开的顺利开展有赖于监督保障机制的实现。文章从省级政府信息公开监督保障机制的现状入手,分析监督保障制度存在的公民参与不足和政府履职不全的问题。提出通过提高社会资本水平、降低公民参与成本、政务公开专职化和公开范围精细化等措施,实现政务公开有序进行。     

北京政法职业学院教学质量监控体系建设调研报告

教育教学质量是学校的立足之本、发展之基、力量之源，教学质量监控是稳步提高教学质量的保障。我院以教学质量为中心，坚持严格的质量标准，建立了较为完善的教学质量监控体系，形成了分析、评价、反馈制度，营造了良好的教学环境，达到了较好的教学效果。     

我国人力资源市场中介服务机构信息监测的特点与发展

人力资源市场中介服务机构信息监测是政府部门的重要职责。本文阐述了人力资源市场中介服务机构信息监测的基本特点;从信息监测的内容体系、运行机制、保障机制等三个方面,分析了目前我国人力资源市场中介服务机构信息监测存在的主要问题;从加强信息监测主体能力建设、完善信息监测内容体系、完善信息采集机制、健全信息发布机制、优化信息监测保障机制等五个方面,提出了加强我国人力资源市场中介服务机构信息监测的思路对策。     

中国传统监察制度的历史借鉴价值

在惩治和预防腐败体系中，监督处于关键性的地位。构建具有中国特色的监督体制，必须十分重视借鉴中国传统的监察制度。在中国古代监察制度中，以下方面仍然值得今天借鉴：监察系统实行垂直领导制；充实完善监察立法；对御史及其监察活动进行监督；特别选用监察御史；树立御史权威；实施秩卑、权重、赏厚的巧妙设计。借鉴中国传统监察制度决不是生搬硬套的“拿来主义”，而应该结合现实情况，进行创造性的转化和扬弃。     

社区治安风险评估与监控系统建设的几点思考

社区治安状况的优劣已经影响到整个社会的治安状况,社区治安风险评估能够为制定社区安全防范的具体措施和管理决策提供依据。本文以保障社区安全为目的,分析了研究社区治安风险评估与监控的意义;运用对比和归纳的方法,从国内外技术、知识产权、国内现有的工作基础和国内外技术发展趋势等角度总结了社区治安风险评估与监控研究的现状;并在对2010年某派出所盗窃机动车、抢夺、抢劫、入室盗窃等可防性主要刑事案件研判的基础上,进行了社区监控系统的需求分析。