Thermally Controlled,Active Imperceptible Artificial Skin in Visible‐to‐Infrared Range

Cephalopods’ extraordinary ability to hide into any background has inspired researchers to reproduce the intriguing ability to readily camouflage in the infrared (IR) and visible spectrum but this still remains as a conundrum. In this study, a multispectral imperceptible skin that enables human skin to actively blend into the background both in the IR‐visible integrated spectrum only by simple temperature control with a flexible bi‐functional device (active cooling and heating) is developed. The thermochromic layer on the outer surface of the device, which produces various colors based on device surface temperature, expands the cloaking range to the visible spectrum (thus visible‐to‐IR) and ultimately completes day‐and‐night stealth platform simply by controlling device temperature. In addition, the scalable pixelization of the device allows localized control of each autonomous pixel, enabling the artificial skin surface to adapt to the background of the sophisticated pattern with higher resolution and eventually heightening the level of imperceptibility. As this proof‐of‐concept can be directly worn and conceals the human skin in multispectral ranges, the work is expected to contribute to the development of next‐generation soft covert military wearables and perhaps a multispectral cloak that belongs to cephalopods or futuristic camouflage gadgets in the movies.     

AB9: A neural processor for inference acceleration

We present AB9, a neural processor for inference acceleration. AB9 consists of a systolic tensor core (STC) neural network accelerator designed to accelerate artificial intelligence applications by exploiting the data reuse and parallelism characteristics inherent in neural networks while providing fast access to large on‐chip memory. Complementing the hardware is an intuitive and user‐friendly development environment that includes a simulator and an implementation flow that provides a high degree of programmability with a short development time. Along with a 40‐TFLOP STC that includes 32k arithmetic units and over 36 MB of on‐chip SRAM, our baseline implementation of AB9 consists of a 1‐GHz quad‐core setup with other various industry‐standard peripheral intellectual properties. The acceleration performance and power efficiency were evaluated using YOLOv2, and the results show that AB9 has superior performance and power efficiency to that of a general‐purpose graphics processing unit implementation. AB9 has been taped out in the TSMC 28‐nm process with a chip size of 17 × 23 mm². Delivery is expected later this year.     

空载变压器音频特性研究

研究了配电网中常用的降压变压器（６ｋＶ／３８０Ｖ）在音频激励信号频率下原端的阻抗特性,结论是：在音频激励信号范围内,变压器副边开路时,空载阻抗为容性;副边短路时,空载阻抗为感性;当频率确定时,随着变压器容量的增加,变压器空载阻抗下降;同一容量的变压器,随着频率的下降,空载容抗增加;副边接补偿电容时,空载阻抗为感性。     

InGaAsP microdisk lasers on AlxOy

InGaAsP microdisk lasers are fabricated on Al_xO_y by wafer fusion. Room-temperature continuous-wave operation with threshold pump power of 1.13 mW has been achieved from a 2.2-μm diameter microdisk laser. The lasing wavelength with incident pump power redshifts at a rate of 0.28 nm/mW which shows the improved thermal characteristics due to the high thermal conductivity of Al_xO _y bottom layer     

Ga_(1-x)Al_xP混晶的长波长光学声子谱

本文报道Ga_(1-x)Al_xP混晶的室温喇曼散射测试结果。所用的样品用液相外延方法生长在〈111〉晶向的GaP衬底上。混晶组分x值在0.16—0.65之间。实验结果表明,Ga_(1-x)Al_xP混晶的长波长光学声子谱呈现双模行为,具有类GaP和类AIP两个光学支。     

视频处理器中的一种新的彩色图像增强方法

LED显示屏显示图像之前,视频图像通常用视频处理器进行图像增强等操作。本文考虑到视频处理器在RGB彩色图像变换时可能产生的彩色失真情况,提出一种自适应的灰度变换算法,此算法将原始的RGB彩色图像和经过灰度变换后的RGB彩色图像转换到HSB彩色空间,然后将两者的色调与亮度分量进行重组,再对其饱和度进行补偿。这种方法的优点是既保证了原始彩色图像在进行灰度变换后的灰度细节,又能保证其彩色细节,同时提高了原始彩色图像的对比度。另外,此算法计算量小,利于硬件的实时实现。     

具有应变沟道及EOT 1.2nm高性能栅长22nm CMOS器件

深入研究了亚30nm CMOS关键工艺技术,特别是提出了一种新的低成本的提高空穴迁移率的技术--Ge预非晶化S/D延伸区诱生沟道应变技术,它使栅长90nm pMOS空穴有效迁移率在0.6MV/cm电场下提高32%.而且空穴有效迁移率的改善,随器件特征尺寸缩小而增强.利用零阶劳厄线衍射的大角度会聚束电子衍射分析表明,在沟道区相应的压应变为-3.6%.在集成技术优化的基础上,研制成功了高性能栅长22nm应变沟道CMOS器件及栅长27nm CMOS 32分频器电路(其中分别嵌入了57级/201级环形振荡器),EOT为1.2nm,具有Ni自对准硅化物.     

Efficient nearly-optimal motion and structure from images via analysis of dimensional reduction: application to safety checking system

In computing 3D motion and structure from image correspondences, often called the structure from motion (SFM) problem, dimensions of the used variable set are very large because it contains both motion and structure parameters. As a result, to solve the problem incurs much computational burden. However, in on-line applications of the SFM problem, computational efficiency needs to be stressed as some accuracy of the solutions is sacrificed. In this respect, various dimensional reduction methods are often introduced to improve computational efficiency and this usually leads to various reduced-form SFM problems. The so-obtained reduced-form SFM problems depend on fewer unknowns than the original SFM problem, thus allowing, in principle, for a less computationally intensive estimation, albeit potentially sacrificing accuracy of the results. It is thus interesting to study how much accuracy is lost. This is done by analytically proving results on equivalence or proximity of solutions for some example cases of the so-obtained reduced-form SFM problems. And then, based on the analysis, the author also proposes how to reduce the loss of accuracy in the reduced-form SFM problems (in the meaning of adjusting those reduced-form SFM problems to better approximate the original optimal SFM problem; that is, an optimal SFM problem that does not use any dimensional reduction methods). Experimental results are given to show the effect in practice. Finally, as an example application, a safety checking system using vision is considered.     

基于统计特征的微弱生命体征信号提取研究

穿墙探测是雷达技术在新领域的大胆应用。本文以公司正在开发的穿墙探测雷达为基础,研究了经过人体运动(包括躯干运动和呼吸心跳等生命体征运动)调制的雷达回波的构成。根据目标回波与干扰噪声的时、频域差异,提出了以统计特征方差为判别依据的雷达生命体征信号提取算法,并用公司样机进行实验,以实际采集的数据验证了算法的有效性。