一种基于FPGA控制的多路并行数据采集设计方法

目的：为生物电阻抗成像设备设计出一个高精度、高速率，并能进行同步采集的多路信号采集模块。方法：通过在FPGA上定制一个NiosII软核来作为系统的微控制器，然后通过对FPGA编程实现对多路A／D并行采集的时序控制，最后通过UART总线实现采集板与上位机之间的数据传输。结果：该系统成功地实现了对4路A／D转换器的并行控制，并实现了在100Hz～100kHz激励下对64路信号进行同步采集及初步的处理。结论：该设计方案达到了研究目的，能够满足EIS成像系统的数据采集需求。     

PexLoc—Parallel excitation using local encoding magnetic fields with nonlinear and nonbijective spatial profiles

With the recent proposal of using magnetic fields that are nonlinear by design for spatial encoding, new flexibility has been introduced to MR imaging. The new degrees of freedom in shaping the spatially encoding magnetic fields (SEMs) can be used to locally adapt the imaging resolution to features of the imaged object, e.g., anatomical structures, to reduce peripheral nerve stimulation during in vivo experiments or to increase the gradient switching speed by reducing the inductance of the coils producing the SEMs and thus accelerate the imaging process. In this work, the potential of nonlinear and nonbijective SEMs for spatial encoding during transmission in multidimensional spatially selective excitation is explored. Methods for multidimensional spatially selective excitation radiofrequency pulse design based on nonlinear encoding fields are introduced, and it is shown how encoding ambiguities can be resolved using parallel transmission. In simulations and phantom experiments, the feasibility of selective excitation using nonlinear, nonbijective SEMs is demonstrated, and it is shown that the spatial resolution with which the target distribution of the transverse magnetization can be realized varies locally. Thus, the resolution of the target pattern can be increased in some regions compared with conventional linear encoding. Furthermore, experimental proof of principle of accelerated two‐dimensional spatially selective excitation using nonlinear SEMs is provided in this study. Magn Reson Med 70:1220–1228, 2013. © 2012 Wiley Periodicals, Inc.     

协定肢伤Ⅰ方口服、热敷治疗四肢闭合损伤大样本随机平行对照研究

[目的]观察协定肢伤I方口服热敷治疗四肢闭合损伤疗效。[方法]使用大样本随机平行对照方法,将2468例门诊及住院患者按掷骰子法随机分为两组。对照组1212例协定肢伤I方(红花、延胡索各15g,桃仁、川芎、赤芍、生三七粉另包冲服、当归、泽泻、桂枝、牛膝、山楂各10g),1剂/d,水煎300mL,早晚温服;蜡疗机熬化粗石蜡装塑料袋敷于患处,12h/次。治疗组1256例协定肢伤I方药渣加水送入湿热敷机内与敷布同煮30min,于伤后或术后24h将敷布外套棉布贴敷于伤处,30min/次,2次/d;协定肢伤I方口服同对照组。连续治疗7d为1疗程。观测临床症状、疼痛积分、肿胀指数、不良反应。治疗1疗程,判定疗效。[结果]治疗组痊愈922例,显效248例,有效63例,无效23例,总有效率98.16%。对照组痊愈705例,显效278例,有效105例,无效124例,总有效率89.76%。治疗组疗效优于对照组(P0.05)。相关指标两组均有改善(P0.05),治疗组改善优于对照组(P0.05)。[结论]协定肢伤I方口服热敷治疗四肢闭合损伤效果显著,值得推广。     

基于社会接触网络的大规模人群天花传播并行仿真

天花生物恐怖是世界各国面临的重大潜在威胁.本文利用并行仿真的技术手段,研究天花在大规模城市人群中的传播规律并对环形接种和大规模疫苗接种这两种主要的天花疫苗接种策略进行有效性分析,结果表明环形接种措施能够有效控制天花疫情的扩散,在天花疫苗储备不足的情况下可以优先考虑采用该措施.     

蛇床子汤外阴阴道冲洗联合硝酸咪康唑栓治疗湿热下注型霉菌性阴道炎随机平行对照研究

[目的]观察蛇床子汤外阴阴道冲洗配合硝酸咪康唑栓治疗湿热下注型霉菌性阴道炎疗效。[方法]使用随机平行对照方法,将128例门诊患者按就诊顺序编号分为两组。对照组60例硝酸咪康唑1枚/次,1次/d,阴道用药;治疗组68例蛇床子汤洗剂(蛇床子、苦参、百部、黄柏、白鲜皮、明矾、荆芥、川椒),250mL/次,1次/d,外阴阴道冲洗;硝酸咪康唑栓治疗同对照组。两组均连续治疗7d为1疗程。观测临床症状、阴道分泌物、不良反应。治疗1疗程,判定疗效。[结果]治疗组显效50例,有效15例,无效3例,总有效率95.59%。对照组显效25例,有效24例,无效11例,总有效率81.67%。治疗组疗效优于对照组(P0.05)。[结论]蛇床子汤外阴阴道冲洗联合硝酸咪康唑栓治疗湿热下注型霉菌性阴道炎效果显著,值得推广。     

Monkey visual behavior falls into the uncanny valley

Very realistic human-looking robots or computer avatars tend to elicit negative feelings in human observers. This phenomenon is known as the “uncanny valley” response. It is hypothesized that this uncanny feeling is because the realistic synthetic characters elicit the concept of “human,” but fail to live up to it. That is, this failure generates feelings of unease due to character traits falling outside the expected spectrum of everyday social experience. These unsettling emotions are thought to have an evolutionary origin, but tests of this hypothesis have not been forthcoming. To bridge this gap, we presented monkeys with unrealistic and realistic synthetic monkey faces, as well as real monkey faces, and measured whether they preferred looking at one type versus the others (using looking time as a measure of preference). To our surprise, monkey visual behavior fell into the uncanny valley: They looked longer at real faces and unrealistic synthetic faces than at realistic synthetic faces.