智能电饭煲显控界面可用性评价指标体系研究

为提高智能电饭煲的实用性和便捷性, 选取可用性评价技术对智能电饭煲显控界面进行研究, 并根据消费者以及智能电饭煲自身的特点, 建立了智能电饭煲显控界面评价指标体系。针对该指标体系, 运用G1 法确定了全部评价指标的权重系数。该指标体系的建立可为智能电饭煲显控界面的评价提供科学依据, 并为日后智能电饭煲显控界面的设计提供一定参考。     

基于单片机的课堂签到系统设计与实现

目的为方便教师统计学生的出勤情况,设计和实现课堂签到系统。方法通过分析课堂签到系统的功能,采用发光二极管和光敏二极管构成了光电传感器电路,完成学生学号的识别,以AT89C51单片机、存储器芯片和显示器为核心来实现该系统。结果给出了课堂签到系统的硬件电路设计图和软件设计流程图。结论该系统可以完成到课学生信息的统计,同时,也能统计出未到学生的信息,极大的提高了教师的工作效率。     

柴油机气缸盖传热规律研究

利用Star CCM+软件,采用多面体网格技术和基于流体体积函数方法(VOF)的两相流沸腾模型,对单缸柴油机气缸盖的冷却传热进行了流-固耦合仿真计算,通过气缸盖的测试温度对仿真结果进行了校验.在此基础上,对气缸盖的传热规律进行了研究.研究表明,单缸柴油机负荷增加时,气缸盖冷却水壁面排气门鼻梁区的传热系数HTC呈现出在较小负荷增加迅速,在较大负荷增加变缓的规律;气缸盖向冷却水传递的热流量则随单缸柴油机负荷的提高呈现出加速上升的趋势,转速为2 000r.min-1时,单缸柴油机功率由44kW增加到61kW,气缸盖传递给冷却水的热流量增幅为31.4%;功率由61kW增加到80kW,气缸盖传递给冷却水的热流量增幅为61.3%.     

程控交换机主叫号码显示业务及故障分析

数字程控交换机的主叫号码显示是应用最广泛的交换机新业务,文章介绍了数字程控交换机主叫号码显示业务的使用及一些常见故障的分析。     

基于表观特征的单目视觉算法实现的注视方向估计

视线跟踪作为一种重要的人机接口模式,能够提供丰富的人机交互信息.提出了基于单目视觉的视线跟踪方法( Monocular Vision Approach,MVA).从眼部图像提取的表观特征,再经过支持向量回归( Support Vector Regression,SVR)计算实现可头部动作的注视方向估计.本方法仅用一个摄像机采集一副人脸图像作为输入数据,输出的计算结果是人的头部姿态和注视方向,以摄像机坐标系为参照系.采用的表观特征是基于方向二值模式( Directional Binary Pattern,DBP)算法,解析瞳孔在眼窝中运动引起的图像纹理变化.视线跟踪方法首先将双眼分割出来,并编码成高维的方向二值模式特征,最终通过支持向量回归作为匹配函数计算注视视角.共有11个人共23 676回归样本,按照姿态分成5个聚类集合.实验结果显示,基于本方法进行注视方向估计可以获得3°的测试误差.     

一种新的PDP低灰度级图像增强技术

针对常规PDP显示中的低灰度级轮廓问题,提出了一种新的PDP低灰度级图像增强算法．该算法根据PDP线性离散化的显示特点利用图像的表现率动态选择多种子场的编码,减少了图像伽马变化过程中灰度级的细节损失．针对PDP实际输出亮度相对于输入灰度级有反转的现象进行了理论分析和算法处理,消除了低灰度图像灰阶反转的现象．利用误差扩散算法最大限度地重现了图像的细节．实际结果表明该算法能够减少低灰度级轮廓,其显示效果明显优于传统方案．     

Design and passive analysis of a novel softness display device

Simulating the softness property of object is quite a challenge in virtual reality system. A novel softness display system was developed based on the principle of deformable length of elastic element control （DLEEC）. In the system, the equivalent stiffness of the device is adjustable, and is inversely proportional to the third power of the deformable length of elastic beam. PD position control is employed to guarantee the accurate softness display. The softness of the virtual objects in large scale can be felt with the softness display device. Compared with other haptic devices, the device is passive and exert the react force only when the operator ＂actively touch＂ the virtual objects. The stability of the softness display system was analyzed. It was theoretical proved that the system satisfied the criteria of wide impedance range ＂Z-width＂, and the performance was superior to an active system. The experimental results were presented.     

New findings of Hexalona-branch representatives in Brazil,with a description of Prenda gen. nov. (Crustacea: Anomopoda: Aloninae)

Altogether, Coronatella and Hexalona-branches are considered the main lineages of Aloninae – a subfamily of common bottom-dwelling microcrustaceans in freshwater environments. Although the taxonomic features of Brazilian members of the Hexalona-branch have been summarised for species from the costata-group and affinis-group, a revision of other widely distributed species in the world is still lacking in this country. The aim of this paper was to study the morphology of Brazilian populations from the guttata-group and intermedia-group, and to describe a new genus from the Hexalona-branch. The parthenogenetic females of Alona cf. guttata from Brazil have similar morphology when compared to data from the literature, but the armature of the terminal claw of its males seems to be different from those of Alona guttata sensu stricto, Alona barbulata and Alona werestschagini. The intermedia-group is formed by Alona elisae sp. nov., which seems to be endemic to the Cerrado of Brazil Central, and Alona isabellae sp. nov., which is widely distributed in Brazil; this species has a labral keel armed with 2–4 setulae, and postabdomen with setulae of lateral fascicles longer than the level of marginal denticles, morphological traits that differentiate it from Alona elisae sp. nov. Another endemic species from the Hexalona-branch is Prenda arvensis gen. nov. and sp. nov., which has two main head pores, a reduced seta on endite 1 of the first limb, sixth limb is a wide lobe. The potential of biodiversity from the Hexalona-branch from Brazil is still underestimated, and a global revision of the guttata-group and intermedia-group is very important for the progress of Aloninae taxonomy and systematics.

http://zoobank.org/urn:lsid:zoobank.org:pub:0A2E4A30-0C9C-43E8-8E72-1DEDA6AFF3C3     

Muhaka icipe,an enigmatic new genus and species of Kleidotomini (Hymenoptera: Figitidae: Eucoilinae) from an East African coastal forest

A remarkable new eucoiline genus and species, Muhaka icipe, is described herein. The genus is clearly a Kleidotomini, but is distinguished from other genera in the tribe by a unique head and scutellar morphology. The genus belongs to the ‘wedge-head’-syndrome group of species that, to date, is unique to Afrotropical eucoilines. The new genus and species is reminiscent of Stentorceps Quinlan and Nanocthulhu Buffington, but is readily distinguished from these genera. Muhaka was collected from a threatened kaya (sacred forest) of coastal Kenya. The biological importance of this and other kaya forests, as well as their protection, is discussed.

http://www.zoobank.org/urn:lsid:zoobank.org:pub:6918ED2C-69A4-48FC-A1E4-2B5DFF58E876     

自由立体显示器的效果评定方法

自由立体显示器使用特殊的光学元件使左、右眼的视图产生空间分离,在显示器前方形成相互间隔的独立视区,视图分离的程度决定了场景能否进行立体合成。文章对独立视区的位置进行精确计算并得出分布示意图;提出使用“立体度”作为立体显示器视图分离的度量参数;并讨论了测试和计算方法,完成对自由立体显示器效果的测量和评定。