Development of a Novel Finger-Trigger Interface for Trigger Pull Measurement

Trigger pull is the force that needs to be exerted on the trigger to discharge a firearm. The measurement of trigger pull can assist in the evaluation of the safety, function, and manufacturing characteristics associated with a firearm during the forensic firearm examination process. Nonetheless, the accuracy and uncertainty of trigger pull measurements may be affected by the measuring device, test procedure, and environmental conditions. In this work, an innovative finger-trigger interface device was developed to facilitate accurate trigger pull measurements. The idea was to reduce the variation related to the position of the measurement device on the trigger in existing measuring methods and devices. Three force sensors based on different technologies were initially evaluated. While two of the three sensors failed to produce data, the miniature capacitive plate sensor exhibited high precision and a linear response over the range of typical trigger pulls. To examine the effects of the finger-trigger interface on trigger pull measurement, different sensor housing prototypes were designed in silico and 3D printed for the construction of three finger-trigger interface devices. The performance of each finger-trigger interface device was evaluated by measuring the trigger pulls of several selected firearms and comparing the data to a previously published study. Our preliminary results demonstrated the novel finger-trigger interface device offered a new way to measure trigger pull in situ with acceptable accuracy and precision.     

Using anisotropic diffusion for efficient extraction of sensor noise in camera identification

Each digital camera has an intrinsic fingerprint that is unique to each camera. This device fingerprint can be extracted from an image and can be compared with a reference device fingerprint to determine the device origin. The complexity of the filters proposed to accomplish this is increasing. In this note, we use a relatively simple algorithm to extract the sensor noise from images. It has the advantages of being easy to implement and parallelize, and working faster than the wavelet filter that is common for this application. In addition, we compare the performance with a simple median filter and assess whether a previously proposed fingerprint enhancement technique improves results. Experiments are performed on approximately 7500 images originating from 69 cameras, and the results are compared with this often used wavelet filter. Despite the simplicity of the proposed method, the performance exceeds the common wavelet filter and reduces the time needed for the extraction.     

积木式多功能自动检测实验实训平台的研制

本文介绍的是一种新型的积木式多功能自动检测实验实训平台。它由操作中心平台、信号处理与显示模块、积木式传感器模块、接口与损耗补偿模块、电源时钟及信号源模块等部分组成,能满足高等院校相关专业师生实验实训、科研及创新活动的需要。     

Advanced Framework for Digital Forensic Technologies and Procedures*

Abstract: Recent trends in global networks are leading toward service‐oriented architectures and sensor networks. On one hand of the spectrum, this means deployment of services from numerous providers to form new service composites, and on the other hand this means emergence of Internet of things. Both these kinds belong to a plethora of realms and can be deployed in many ways, which will pose serious problems in cases of abuse. Consequently, both trends increase the need for new approaches to digital forensics that would furnish admissible evidence for litigation. Because technology alone is clearly not sufficient, it has to be adequately supported by appropriate investigative procedures, which have yet become a subject of an international consensus. This paper therefore provides appropriate a holistic framework to foster an internationally agreed upon approach in digital forensics along with necessary improvements. It is based on a top‐down approach, starting with legal, continuing with organizational, and ending with technical issues. More precisely, the paper presents a new architectural technological solution that addresses the core forensic principles at its roots. It deploys so‐called leveled message authentication codes and digital signatures to provide data integrity in a way that significantly eases forensic investigations into attacked systems in their operational state. Further, using a top‐down approach a conceptual framework for forensics readiness is given, which provides levels of abstraction and procedural guides embellished with a process model that allow investigators perform routine investigations, without becoming overwhelmed by low‐level details. As low‐level details should not be left out, the framework is further evaluated to include these details to allow organizations to configure their systems for proactive collection and preservation of potential digital evidence in a structured manner. The main reason behind this approach is to stimulate efforts on an internationally agreed “template legislation,” similarly to model law in the area of electronic commerce, which would enable harmonized national implementations in the area of digital forensics.     

警用活体指纹采集系统基本原理及技术创新

目的创立一种警用多个数字传感器同通道活体指纹采集系统。方法应用多个数字传感器定时同步控制技术、模拟无穷远成像技术、自适应采集参数控制、指位校准、内置专业模糊匹配算法等进行技术创新。结果有效提高活体指纹采集的成功率。结论该系统在实践工作中有广泛应用价值。     

物联网在森林公安业务中的应用初探

物联网技术可以用于管理林区工作,提高工作效率,节约警力,还有利于执法规范化建设。物联网技术里的定位、识别、感知等关键技术,可以应用于开发森林公安业务中对珍稀动植物的定位与保护监控、打击非法收购或运输木材等违法行为以及防火、防灾方面的物联网监控系统。     

警犬在盗窃公用电信设施案中的应用

警犬在打击和预防犯罪过程中发挥了积极的作用，特别在盗窃公用电信设施案中作用更为突出。警犬一般都有高级神经活动机能，有敏锐的嗅觉、听觉和视觉等感觉器官，具有凶猛性、灵活性和飞快的奔跑能力等警用素质，是公安机关执行任务的一种特殊工具。在盗窃公用电信设施案中，报警及时、出警迅速，警犬的使用有很好的时间条件，要充分利用警犬的特殊功能为公安工作服务。     

传感技术在足迹研究中的应用简介

本文概括阐述近年来国内外Foot scan，Novel emed，Zebris FDM系统在医学、体育、刑事技术方面中应用的基本情况。对3套系统测量人体足的动静态压力分布进行对比和分析。在此基础上提出传感器技术在足迹检验中应用的前景。     

Qipao Comeback

正WHEN I was about 13 years old,a shop called Shaolin opened up in my hometown in southeast England.At that time,I had no idea what or where the name Shaolin came from–my friends and I would pronounce it"shay-oh lin"–but after my first visit to the shop,I was certain it would become a firm favorite on our list of places-to-hang-out on a Saturday afternoon.Shaolin was an Aladdin’s cave of Chinese goods.On entering,you were fi rst struck by atmospheric,dim lighting and the heady smell of incense.Then,the sounds:A CD of bamboo flute music accompanied by sounds of nature,and the tinkle of wind chimes evoked a sense of calm that made you want to stop and browse.For me,these sensory experiences became synonymous with"the Orient,"and     

嗅觉模拟技术在火灾探测中的应用

如何极早期并且准确探测到火灾历来是火灾探测研究的重点内容之一。近年来,基于气敏传感器阵列与模式识别方法的嗅觉模拟技术成为国内外研究的热点,并且成功应用于环境监测、医疗诊断、医药及食品工业、化工、军事等领域。目前已经有人尝试将其应用于火灾探测方面。将嗅觉模拟技术应用于火灾探测的实质就是利用嗅觉模拟系统中仿生的气敏元件感应火灾前(中)物质受热分解(燃烧)释放出的气味,这个感应时间早于火灾发生时间、甚至是阴燃发生的阶段,即早于传统火灾探测器的响应时间。所以将其应用于火灾探测领域可以解决以往火灾探测器响应时间晚、响应不准确的关键技术问题。嗅觉模拟技术在火灾探测方面表现出良好的发展潜力。