一种基于频率响应屏蔽技术的FIR滤波器设计新方法

提出了一种设计高效窄过渡带宽FIR滤波器的新方法。该方法以传统的频率响应屏蔽(FRM)方法为基础,通过选择特定的原型滤波器来降低合成的数字FIR滤波器的复杂度。本文研究了该方法的原理、实现结构和设计方法,并通过设计实例证明了此方法的有效性。     

用于高速目标检测的相位编码信号处理方法和性能研究

波形选择是雷达系统设计的重要内容,在数字信号处理理论和计算平台的支持下,波形的处理转换为计算的问题,后端处理计算能力的提升极大地拓展了波形的应用场景。相位编码信号具有多普勒敏感特点,为实现匹配滤波,必须对目标可能出现的速度进行补偿,处理过程复杂,在多数雷达系统中应用场景有限。本文提出了相位解调+傅里叶变换构建滤波器组的方法完成相位编码信号的速度补偿,在单个脉冲内实现同时测距测速,针对空间目标的特点,分析了速度、加速度对波形参数的限制,仿真给出了目标遮蔽、处理损耗、测速精度的结果。     

教室声学环境的分析及改善

对于教室内声学环境的要求,国内及国外一些有关规范都只停留在中频段(500～1 000 Hz)。这样的要求是不够的。在这样的声学环境中,教师健康和学生听课效果均受到影响。文章分析了达到优良室内声学环境的几个重要因素,着重减低低频噪声和控制低频混响时间。利用简单的吸声构件,得到几乎平直的混响时间频率特性。叙述了"掩蔽效应"对中、高频的影响并叙述了"哈斯效应"及在声学处理时要利用有利反射声的注意事项。为得到室内优良的音质环境,提出建议并给出工程实践结果的实例。     

How does target duration affect object substitution masking?

Object substitution masking (OSM) is typically studied using a brief search display. The target item may be indicated by a cue/mask surrounding but not overlapping it. Report of the target is reduced when mask offset trails target offset rather than being simultaneous with it. We report 5 experiments investigating whether OSM can be obtained if the search display is on view for a period of up to 830 ms but cueing of the target location is delayed. The question of interest is whether OSM must reflect the initial response of the visual system to target onset or whether it can arise in other ways, possibly during the transition from a pre-attentive representation of the target item to an attentional representation of it. Our results show that OSM decreases in strength as target duration increases. An explanation is suggested in terms of the object individuation hypothesis (Lleras & Moore, 2003). (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Object substitution masking: When does mask preview work?

When a target is enclosed by a 4-dot mask that persists after the target disappears, target identification is worse than it is when the mask terminates with the target. This masking effect is attributed to object substitution masking (OSM). Previewing the mask, however, attenuates OSM. This study investigated specific conditions under which mask preview was, or was not, effective in attenuating masking. In Experiment 1, the interstimulus interval (ISI) between previewed mask offset and target presentation was manipulated. The basic preview effect was replicated; neither ISI nor preview duration influenced target identification performance. In Experiment 2, mask configurations were manipulated. When the mask configuration at preview matched that at target presentation, the preview effect was replicated. New evidence of ineffective mask preview was found: When the two configurations did not match, performance declined. Yet, when the ISI between previewed mask offset and target presentation was removed such that the mask underwent apparent motion, preview was effective despite the configuration mismatch. An interpretation based on object representations provides an excellent account of these data. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Substitution of sodium chloride by Morton Lite Salt or Mineral Salt in mayonnaise

The effect of substituting Morton Lite Salt or Mineral Salt for sodium chloride in neutral emulsion and in mayonnaise was evaluated by using 1.00% sodium chloride, 1.25% Morton Lite Salt and 1.40% Mineral Salt of the emulsion weight. None, 1.00%, 2.00% and 3.00% of lactose were used to mask the bitter taste associated with potassium chloride. A triangle test using twelve to fifteen panelists was used. Results indicated that both Morton Lite Salt and Mineral Salt had a significant different taste (P ≤ 0.01) as compared with sodium chloride when they were used with none and 1.00% of lactose. Samples which had 2.00% or 3.00% lactose showed no significant taste difference between Morton Lite Salt or Mineral Salt and sodium chloride. It was concluded that a bitter masking agent such as lactose is needed when Morton Lite Salt or Mineral Salt is used to substitute sodium chloride in mayonnaise.     

道路约束在Kalman滤波中的应用

研究把道路约束引入Kalman滤波的新方法,分析了道路对过程噪声和目标速度的约束,给出了道路约束条件下目标的运动方程以及过程噪声方差调整的方法;将道路对目标速度的约束以伪测量的形式引入测量方程并给出了对应的滤波方程。两个不同场景的蒙特卡罗仿真结果验证了上述新算法带来的性能改善。     

油气勘探成图软件开发

PlotEasy油气勘探成图软件是NEWS油藏综合解释系统的一个专业应用子系统，它主要由图形编辑、计算机图形元文件（CGM）生成和解释、光栅绘图3部分组成。介绍了其设计与实现，CGM及光栅绘图技术。     

A review on the taste masking of bitter APIs: hot-melt extrusion (HME) evaluation

The majority of active pharmaceutical ingredients (APIs) found in oral dosage forms have a bitter taste. Masking the unpleasant taste of bitter, APIs is a major challenge in the development of such oral dosage forms. Taste assessment is an important quality-control parameter for evaluating taste-masked formulations of any new molecular entity. Hot-melt extrusion (HME) techniques, have very recently, been accepted from an industrial compliance viewpoint in relation to both manufacturing operations and development of pharmaceuticals. HME achieves taste masking of bitter APIs via various mechanisms such as the formation of solid dispersions and inter-molecular interactions and this has led to its wide-spread use in pharmaceutical formulation research. In this article, the uses of various taste evaluation methods and HME as continuous processing techniques for taste masking of bitter APIs used for the oral delivery of drugs are reviewed.     

群智感知中基于云辅助的隐私信息保护机制

为实现对移动群智感知中隐私信息的保护,解决请求者在云端监听,请求者与诚实且好奇的云相互串通导致用户隐私信息泄露的问题,提出一种基于云辅助的隐私信息保护机制。通过对用户贡献的数据进行拆分重组,使敏感数据脱敏,利用同态加密对拆分后数据进行处理,防止隐私信息的泄露,使移动用户可以安全地参与感知过程,保护请求者的权益。模拟实验结果表明了所提方案是可行有效的。