VLSI Architecture Design of Fractional Motion Estimation for H.264/AVC

The H.264/AVC Fractional Motion Estimation (FME) with rate-distortion constrained mode decision can improve the rate-distortion efficiency by 2–6 dB in peak signal-to-noise ratio. However, it comes with considerable computation complexity. Acceleration by dedicated hardware is a must for real-time applications. The main difficulty for FME hardware implementation is parallel processing under the constraint of the sequential flow and data dependency. We analyze seven inter-correlative loops extracted from FME procedure and provide decomposing methodologies to obtain efficient projection in hardware implementation. Two techniques, 4×4 block decomposition and efficiently vertical scheduling, are proposed to reuse data among the variable block size and to improve the hardware utilization. Besides, advanced architectures are designed to efficiently integrate the 6-taps 2D finite impulse response, residue generation, and 4×4 Hadamard transform into a fully pipelined architecture. This design is finally implemented and integrated into an H.264/AVC single chip encoder that supports realtime encoding of 720×480 30fps video with four reference frames at 81 MHz operation frequency with 405 K logic gates (41.9% area of the encoder).

Software Optimization in Ultrasound Imaging Technique Using Improved Deep Belief Learning Network on the Internet of Medical Things Platform

Wireless Personal Communications - The Internet of Medical Things (IoMT) is the array of medical instruments and related technologies that link Information Technology (IT) systems in...     

白云鄂博西矿矿浆输送管道的应用

白云鄂博西矿应用管道输送技术进行矿浆输送，相比传统的铁路和卡车运输，在输送能力和环保方面优势突出，目前总体运行较为稳定，且运输成本较低。针对部分管段存在的运行压力升高、结垢、凹坑问题，目前正在组织进行清管工作，以确保管道输送顺畅进行。     

Torsional Energy Barriers in Dimethyl Ether and Perfluoro-Dimethyl Ether: Electronic Structure Contributions

The optimized geometries, torsional energy barriers and atomic charge in dimethyl ether and perfluoro-dimethyl ether have been investigated with density functional theory (dft) molecular orbital calculations. The optimized dimethyl ether (DME) and perfluoro-dimethyl ether (PFDME) geometries have been obtained and are in good agreement with experimental results. The torsional energy barriers for both the DME and PFDME have been calculated by incrementally increasing the dihedral angle and performing a full-geometry optimization. The DME and PFDME barriers have been compared, and the geometries of the transition states for both molecules are given. The net atomic charges of both the optimized and transition state species are calculated for both DME and PFDME and shown to be consistent with a stereoelectronic effect (anomeric) that mixes an anti-bonding C–H-centered molecular orbital and an oxygen lone pair. The effects of this antiperiplanar electronic interaction are discussed, and the calculated torsion energy barriers are justified using a simplified second-order bonding model.     

Kirigami‐Inspired Self‐Assembly of 3D Structures

Self‐assembly of 3D structures presents an attractive and scalable route to realize reconfigurable and functionally capable mesoscale devices without human intervention. A common approach for achieving this is to utilize stimuli‐responsive folding of hinged structures, which requires the integration of different materials and/or geometric arrangements along the hinges. It is demonstrated that the inclusion of Kirigami cuts in planar, hingeless bilayer thin sheets can be used to produce complex 3D shapes in an on‐demand manner. Nonlinear finite element models are developed to elucidate the mechanics of shape morphing in bilayer thin sheets and verify the predictions through swelling experiments of planar, millimeter‐scaled PDMS (polydimethylsiloxane) bilayers in organic solvents. Building upon the mechanistic understandings, The transformation of Kirigami‐cut simple bilayers into 3D shapes such as letters from the Roman alphabet (to make “ADVANCED FUNCTIONAL MATERIALS”) and open/closed polyhedral architectures is experimentally demonstrated. A possible application of the bilayers as tether‐less optical metamaterials with dynamically tunable light transmission and reflection behaviors is also shown. As the proposed mechanistic design principles could be applied to a variety of materials, this research broadly contributes toward the development of smart, tetherless, and reconfigurable multifunctional systems.     

一个批判性回顾与展望——台湾大学建筑与城乡研究所教研实践

从理论与专业的角度,回顾过去台湾大学建筑与城乡研究所的教育目标和在知识上的主要发展线索,以及实际执行时遇到的困难。在教育目标上,面对一个发展中国家的教育资源不足的现实,专业的通才教育是核心教师共同的目标,针对建筑、城市规划、地景建筑三者的共享知识,提供规划与设计的专业训练。由于教师职业多为台湾归国留学生中的一时之选,以及发扬开放而自由的台大学风,学生与教师适时地响应了当时台湾社会的变动,这主要表现在对一系列的都市运动的响应之上,取得了一定程度的影响力。面对当前空间与社会的巨变,首先是学生们提出改革的要求,于是教师提出新的因应方向,响应他们的期望,推动机构本身在改革过程所急需的人事、教学与研究的再建构。这是建筑与城乡研究所面对的21世纪的挑战。     

Size-dependent ultrafast magnetization dynamics in iron oxide (Fe3O4) nanocrystals

Optically induced ultrafast demagnetization and its recovery in superparamagnetic colloidal iron oxide (Fe3O4) nanocrystals have been investigated via time-resolved Faraday rotation measurements. Optical excitation with near-infrared laser pulse resulted in ultrafast demagnetization in approximately 100 fs via the destruction of ferrimagnetic ordering. The degree of demagnetization increased with the excitation density, and the complete demagnetization reached at approximately 10% excitation density. The magnetization recovered on two time scales, several picoseconds and hundreds of picoseconds, which can be associated with the initial reestablishment of the ferrimagnetic ordering and the electronic relaxation back to the ground state, respectively. The amplitude of the slower recovery component increased with the size of the nanocrystals, suggesting the size-dependent ferrimagnetic ordering throughout the volume of the nanocrystal.     

Supported Lipid Bilayer Assembly on PEDOT:PSS Films and Transistors

Lipid bilayers are widely employed as a model system to investigate interactions between cells and their environment. Supported lipid bilayers (SLB) with integrated transmembrane proteins are emerging as a preferred platform for sensing applications. Challenges lie in the generation of SLB on surfaces which allow transduction of signals for characterization of lipid bilayer and incorporated transmembrane proteins. For the first time, the formation of SLBs is shown on films of the conducting polymer, poly(3,4‐ethylenedioxythiophene) doped with poly(styrene sulfonate) (PEDOT:PSS), using traditional methods for characterizing lipid bilayer quality and function (QCM‐D, FRAP) combined with impedance spectroscopy. Further, partial formation of SLBs on PEDOT:PSS based organic electrochemical transistors (OECTs) is successfully demonstrated, as well as the ability to integrate and sense the ion pore α‐hemolysin, confirming the sensitivity of the OECT as a transducer of biological membrane function. This work represents a highly promising first step toward the use of such OECTs for functional readout of transmembrane proteins in their native environment.     

System performance and economic analysis of solar-assisted cooling/heating system

The long-term system simulation and economic analysis of solar-assisted cooling/heating system (SACH-2) was carried out in order to find an economical design. The solar heat driven ejector cooling system (ECS) is used to provide part of the cooling load to reduce the energy consumption of the air conditioner installed as the base-load cooler. A standard SACH-2 system for cooling load 3.5 kW (1 RT) and daily cooling time 10 h is used for case study. The cooling performance is assumed only in summer seasons from May to October. In winter season from November to April, only heat is supplied. Two installation locations (Taipei and Tainan) were examined.It was found from the cooling performance simulation that in order to save 50% energy of the air conditioner, the required solar collector area is 40 m² in Taipei and 31 m² in Tainan, for COP_j = 0.2. If the solar collector area is designed as 20 m², the solar ejector cooling system will supply about 17–26% cooling load in Taipei in summer season and about 21–27% cooling load in Tainan. Simulation for long-term performance including cooling in summer (May–October) and hot water supply in winter (November–April) was carried out to determine the monthly-average energy savings. The corresponding daily hot water supply (with 40 °C temperature rise of water) for 20 m² solar collector area is 616–858 L/day in Tainan and 304–533 L/day in Taipei.The economic analysis shows that the payback time of SACH-2 decreases with increasing cooling capacity. The payback time is 4.8 years in Tainan and 6.2 years in Taipei when the cooling capacity >10 RT. If the ECS is treated as an additional device used as a protective equipment to avoid overheating of solar collectors and to convert the excess solar heat in summer into cooling to reduce the energy consumption of air conditioner, the payback time is less than 3 years for cooling capacity larger than 3 RT.     

朝鲜某地硫化铜镍矿浮选试验研究

为了给开发朝鲜某地硫化铜镍矿石提供依据,在工艺矿物学研究的基础上,对该矿石进行了浮选试验。试验结果表明,在-0.074 mm占75%的磨矿细度下,经过1次粗选、3次精选、4次扫选,可以得到适合电炉熔炼的合格铜镍混合精矿,精矿镍品位为5.16%,镍回收率为92.13%,铜品位为1.94%,铜回收率为97.47%。