Lithium (Li) is recovered from the deposits of brines, pegmatites, and sedimentary rocks. It is extracted from brines in the form of lithium chloride. These brines are found in salt flats or salt lakes. Lithium is derived from spodumene, a commercially exploited hard rock mineral, through acid fusion. Lithium and its derivative compounds are used in many end-use segments such as Batteries, Ceramics and Glass, Lubricants, Metallurgy, Air Treatment, Polymers, and Others. In addition, lithium compounds are used as a psychiatric medication.

A touchscreen is a two-dimensional sensing device in the form of a transparent sheet and is integrated in devices for providing a sensing and feedback system. Touchscreens consist of various layers that track and convert movements on the screen into electrical signals, which are then sent to the processor to perform the required action on the device. These screens need three basic components to provide a touch interface: a touch sensor, a controller IC, and a software driver. A touch sensor holds high significance as it forms the interface between the display and user. In addition, most R&D goes around touch sensors to enhance touch sensitivity. Vendors in the Touchscreen market are focused on a number of touchscreen technologies, using different materials and employing technologically advanced components to increase their profitability.

A touchscreen refers to a display screen that is sensitive to the touch of a finger or stylus. Unlike a fixed keyboard with buttons, the user interface of a touchscreen can be designed in different ways. The Touchscreen market has exploded since the introduction of Apple iPhones in 2007. From smartphones and laptops to GPS systems, touchscreen devices are widely used. Consumers are now expecting an intuitive touch experience from every new device hitting the market.

A baby monitor, also known as a baby alarm, is a device used to transmit sound and videos to a receiver to keep tabs on activities in case parents are not around. A basic baby monitor functions by using a radio transmitter, wherein he sound produced by a baby is transferred to a receiver. The receiver contains an inbuilt speaker that enables listeners to hear the baby from various locations within a certain range.

针对最小带宽再生情形下的有效修复问题,提出了一种新型部分重复(FR,fractional repetition)码设计。该设计由外部最大距离可分(MDS,maximum distance separable)码和内部重复码组成,称为GDDBFR(group divisible design based FR)码,可以达到随机访问模式下的系统存储容量,并且能够在很大范围内选择构造参数。理论分析指出,尽管GDDBFR码采用基于表格的修复方式,但通常具有大量的节点修复选择方案。此外,实验结果表明,与传统的RS(Reed-Solomon)码和再生码相比,GDDBFR码可以显著地减少失效修复时间。

频繁模式挖掘在分类问题中得到了广泛的应用,大量的工作利用频繁模式挖掘对分类问题进行特征选择,但对于为什么频繁模式挖掘可以在分类问题中进行有效的特征选择则缺乏系统的研究.为了为频繁模式挖掘在分类问题中的特征选择应用提供理论基础,需要确立特征的支持度与特征分类能力之间的关系,本文以特征的信息增益作为分类能力的评价准则,讨论其与特征支持度之间的联系.首先证明了信息增益是特征支持度的上凸函数;然后,在二类问题和多类问题情况下,分别证明了具有低支持度或高支持度的特征具有有限的信息增益,即具有低支持度或高支持度的特征具有有限的分类能力.最后,通过仿真实验验证了支持度与信息增益之间的关系,为频繁模式挖掘在分类问题中的应用提供了理论基础.

提出了一种安全分类协议SSC,该协议在保护待分类数据和分类规则隐私的情况下使存储节点进行正确分类,并且sink节点可以对分类结果进行抽样认证,防止妥协存储节点伪造分类结果。提出了一种不经意比较(oblivious comparison)技术MHash,该技术首先将分类需要的大小比较转换成等值比较,并进一步采用模运算和散列技术实现隐私保护下的数据分类。提出了一种"十"字邻居技术,分别将传感器以及传感器采集的数据组织成链,并采用倒置布鲁姆过滤器技术同步传感器节点之间的数据,sink利用该技术可以抽样检查存储节点分类统计结果的正确性,分析和实验结果验证了所提方案的有效性。

为了降低二维MUSIC(Two Dimensional Multiple Signal Classification,2-D MUSIC)算法的计算量,提高算法的实时处理能力,基于噪声子空间映射思想提出了一种适用于任意平面阵列结构的二维波达角(Direction Of Arrival,DOA)快速估计算法.新算法利用空间角度划分及非线性变换将信号子空间与噪声子空间的正交性等价地压缩至某个角度分片内,使得真实DOA在该角度分片内产生虚拟镜像,通过搜索该角度分片得到虚拟DOA,最后利用数学式直接计算得到真实DOA.理论分析和实验结果表明新算法能够成倍地提高DOA估计的速度,同时具有比MUSIC算法更高的空间分辨率.