Parallelizing Complex Streaming Applications on Distributed Scratchpad Memory Multicore Architecture

Multicore processors can provide sufficient computing power and flexibility for complex streaming applications, such as high-definition video processing. For less hardware complexity and power consumption, the distributed scratchpad memory architecture is considered, instead of the cache memory architecture. However, the distributed design poses new challenges to programming. It is difficult to exploit all available capabilities and achieve maximal throughput, due to the combined complexity of inter-processor communication, synchronization, and workload balancing. In this study, we developed an efficient design flow for parallelizing multimedia applications on a distributed scratchpad memory multicore architecture. An application is first partitioned into streaming components and then mapped onto multicore processors. Various hardware-dependent factors and application-specific characteristics are involved in generating efficient task partitions and allocating resources appropriately. To test and verify the proposed design flow, three popular multimedia applications were implemented: a full-HD motion JPEG decoder, an object detector, and a full-HD H.264/AVC decoder. For demonstration purposes, SONY PlayStation \(^{\circledR }\) 3 was selected as the target platform. Simulation results show that, on PS3, the full-HD motion JPEG decoder with the proposed design flow can decode about 108.9 frames per second (fps) in the 1080p format. The object detection application can perform real-time object detection at 2.84 fps at \(1280 \times 960\) resolution, 11.75 fps at \(640 \times 480\) resolution, and 62.52 fps at \(320 \times 240\) resolution. The full-HD H.264/AVC decoder applications can achieve nearly 50 fps.     

IDE驱动程序分析及SATA驱动程序移植

SATA硬盘已经是目前多媒体应用中被广泛使用的存储介质, 而有些多媒体产品的Linux版本中, 并不支持SATA驱动框架。本文通过对Linux下IDE驱动框架及其相关的Linux驱动代码的分析, 提供了一种在IDE驱动程序框架下移植SATA驱动程序的方法。最后以SiI3512为例, 介绍了SATA驱动程序的移植过程。对于其它此类系统的移植具有很好的借鉴作用。     

面向遥感视觉问答的尺度引导融合推理网络

遥感视觉问答(remote sensing visual question answering,RSVQA)旨在从遥感图像中抽取科学知识.近年来,为了弥合遥感视觉信息与自然语言之间的语义鸿沟,涌现出许多方法.但目前方法仅考虑多模态信息的对齐和融合,既忽略了对遥感图像目标中的多尺度特征及其空间位置信息的深度挖掘,又缺乏对尺度特征的建模和推理的研究,导致答案预测不够全面和准确.针对以上问题,本文提出了一种多尺度引导的融合推理网络(multi-scale guided fusion inference network,MGFIN),旨在增强RSVQA系统的视觉空间推理能力.首先,本文设计了基于Swin Transformer的多尺度视觉表征模块,对嵌入空间位置信息的多尺度视觉特征进行编码;其次,在语言线索的引导下,本文使用多尺度关系推理模块以尺度空间为线索学习跨多个尺度的高阶群内对象关系,并进行空间层次推理;最后,设计基于推理的融合模块来弥合多模态语义鸿沟,在交叉注意力基础上,通过自监督范式、对比学习方法、图文匹配机制等训练目标来自适应地对齐融合多模态特征,并辅助预测最终答案.实验结果表明,本文提出的模型在两个公共RSVQA数据集上具有显著优势.     

采用声发射技术测试电镀氧化铝涂层力学性能

采用声发射(AE)技术实现动态监测4043铝合金/氧化铝涂层系统的拉伸实验过程。通过SDAEA信号分析系统对拉伸过程中AE信号幅度、能量、振铃计数、撞击速率以及波形和其傅里叶变换(FFT)进行了分析。揭示出4043铝合金/氧化铝涂层系统拉伸过程中涂层裂纹萌生和扩展过程,并且通过分析AE信号随时间的变化规律得出涂层材料的面内拉伸强度和涂层结合强度。     

Establishment of functional rumen bacterial consortia (FRBC) for simultaneous biohydrogen and bioethanol production from lignocellulose

For simultaneous saccharification and fermentation of cellulosic bioresources to biofuels, a stable rumen-mimicking bacterial consortium was established and maintained by sub-culturing and is referred to here as the “Functional Rumen Bacterial Consortium” (FRBC). The microbial community was analyzed by denaturing gradient gel electrophoresis, which contained dominant species such as Clostridium xylanolyticum, Clostridium papyrosolvens, Clostridium beijerinckii, Clostridium puniceum, Clostridium putrifaciens, and Ruminococcus sp. These predominant Clostridial strains showed potential in converting lignocellulosic material into bio-hydrogen and bio-fuels. The Clostridial strains with 16S rRNA sequences identical to the DGGE profile were isolated from FRBC. The isolate C. puniceum strain Ru6 exhibited xylanase and pectinase activity and higher hydrogen productivity and was thus chosen as the partner strain for ethanol production with C. xylanolyticum Ru15, which showed additional endoglucanase activity. A co-culture approach was used to reconstruct the FRBC with Ru6 and Ru15, and the productivities of hydrogen and ethanol were comparable to that of the FRBC. These results demonstrate the potential of a biologically inspired rumen-mimic microbial community to produce cellulosic bio-fuels.     

蜂蜜中兽药残留检测方法的研究进展

随着我国蜂业的发展,蜂蜜中兽药残留问题日益成为食品安全领域的重要内容,引起世界范围内的广泛关注。兽药残留不仅危害人体健康也对我国蜂蜜的出口带了严重的阻力。近年来国家质量监督检验检疫总局、农业部及卫生与计划生育委员会等对此加大重视程度。由于蜂蜜基质复杂,其中兽药残留含量较低,因此,发展快速、简易、高灵敏度、高通量的兽药检测技术成为了目前迫切的需要。本文结合蜂蜜中兽药残留的现状,对目前蜂蜜中兽药残留的不同检测方法(液相色谱-串联质谱法、免疫分析法、分子印迹法、毛细管电泳法等技术)进行了阐述,并对兽药残留检测技术在未来的发展方向进行了进一步展望。     

Si_3N_4/BN_(f)复合材料的相界面

本文借助高分辨电子显微镜研究了Si3N4／BN（f）复合材料的相界面,研究发现，BN纤维的两端与基体结合牢固，界面不易解离，材料断裂过程中纤维很难拔出．材料的韧性主要通过BN纤维自身（001）面上的滑移、撕裂和弯曲以及BN纤维的侧表面与Si3N4颗粒的界面上的解离等途径得以提高．     

Real-time imaging of tunable adenosine 5-triphosphate release from an MCM-41-type mesoporous silica nanosphere-based delivery system

We studied a mesoporous silica nanosphere (MSN) material with tunable release capability for drug delivery applications. We employed luciferase chemiluminescence imaging to investigate the kinetics and mechanism of the adenosine 5-triphosphate (ATP) release with various disulfide-reducing agents as uncapping triggers. ATP molecules were encapsulated within the MSNs by immersing dry nanospheres in aqueous solutions of ATP followed by capping of the mesopores with chemically removable caps, such as cadmium sulfide (CdS) nanoparticles and poly(amido amine) dendrimers (PAMAM), via a disulfide linkage. By varying the chemical nature of the 'cap' and 'trigger' molecules in our MSN system, we discovered that the release profiles could indeed be regulated in a controllable fashion.     

Characterization of Sub-THz Photonic-Transmitters Based on GaAs–AlGaAs Uni-Traveling-Carrier Photodiodes and Substrate-Removed Broadband Antennas for Impulse-Radio Communication

A novel photonic transmitter for wireless terahertz (THz) impulse-radio (IR) communication is realized by monolithic integration of a GaAs-AlGaAs-based uni-traveling-carrier (UTC) photodiode with a substrate-removed broadband antenna. The device can radiate strong sub-THz pulses (20-mW peak-power) with a narrow pulsewidth (<2 ps) and wide bandwidth (100 ~ 250 GHz). The maximum average power emitted by our device, under the same THz time-domain spectroscopic setup, is around ten times higher than that of the low-temperature-grown GaAs-based photoconductive antenna, while with a much lower dc bias (9 versus 35 V). The bias-dependent peak output powers of our devices suggest their suitability for application as a data modulator/emitter for photonic THz IR communication.     

Tuning PID control of an automatic arc welding system using a SMAW process

A new method to tune the gains of the proportional integral derivative (PID) controller for alternating current shield metal arc welding (SMAW) of automatic arc welding system using a SMAW process is presented in this paper. This method used the genetic algorithm (GA) approach to optimize the gains of the PID auto-tuner and considerably modulated the rate of an electrode feed mechanism that regulates arc current. The proposed controller was verified by simulation and experiments of the transient response in the automatic arc welding system. Finally, the performance indices of the proposed controller are compared with that based on Ziegler–Nichols tuning rules.