Structure Design Considerations of a Sub-50nm Self-Aligned Double-Gate MOSFET

A comprehensive way to design a sub 50nm SADG MOSFET with the ability of being fabricated by improved CMOS technique is described.Under this way,the gate length and thickness of Si island of DG device show many different scaling limits for various elements.Meanwhile,the spacer insulator shows a kind of width thickness on device drain current and circuit speed.A model about that effect is developed and offers design consideration for future.A new design of channel doping profile,called SCD,is also discussed here in detail.The DG device with SCD can achieve a good balance between the volume inversion operation mode and the control of V th .Finally,a guideline to make a SADG MOSFET is presented.

DESIGN OF TWO-PHASE SINUSOIDAL POWER CLOCK AND CLOCKED TRANSMISSION GATE ADIABATIC LOGIC CIRCUIT

First the research is conducted on the design of the two-phase sinusoidal power clock generator in this paper. Then the design of the new adiabatic logic circuit adopting the two-phase sinusoidal power clocks--Clocked Transmission Gate Adiabatic Logic （CTGAL） circuit is presented. This circuit makes use of the clocked transmission gates to sample the input signals, then the output loads are charged and discharged in a fully adiabatic manner by using bootstrapped N-Channel Metal Oxide Semiconductor （NMOS） and Complementary Metal Oxide Semiconductor （CMOS） latch structure. Finally, with the parameters of Taiwan Semiconductor Manufacturing Company （TSMC） 0.25um CMOS device, the transient energy consumption of CTGAL, Bootstrap Charge-Recovery Logic （BCRL） and Pass-transistor Adiabatic Logic （PAL） including their clock generators is simulated. The simulation result indicates that CTGAL circuit has the characteristic of remarkably low energy consumption.

Determination AHP Analysis of the Virtual Stage-Gate Process in the Global Scale Automotive Design

In this study, it is aimed to determine the ranking importance levels of the stages to be taken into consideration for new product development on a global scale in the automotive design process. New product design activity and stage-gate process differences between local automotive firms (serial production factory and stage-gate department in Turkey) and global automotive companies (serial production factory and stage-gate department in Turkey) are examined comparatively in the research area. In the automotive industry, which has been developing for a century, the question of how the local company products operating in the last sixty years have not been able to spread globally or how to develop global products is the background question of the research. For this purpose, one on one interviews were held with the managers of 3 national and 3 international automotive companies, who worked in the same region and who had previously designed a new vehicle, with design and product development departments.?According to?the data obtained by the AHP (Analytic Hierarchy Process) in the automotive design process, the importance of the criteria that should be taken into account for global product development has revealed. According to the results of the study, it was found that design validation stages were the most important globalization criterion in automotive design process as a new study area. In the comprehensive survey of the study, no other publication has been encountered to measure or evaluate the stages in the automotive design and new product development process in other sectors, including the vehicle industry. As in every industry sector, in the automotive industry, with the new product companies provide market development or competitive advantage. The new product is the life channel of a company and in the realization of this new vehicle;the disciplines of the automotive industry are formed by a hundred years of experience.

FUZZY KNOWLEDGE ACQUIREMENT IN GATE DESIGN

In order to reduce time and cost in engineering design, such as gate design, integral field knowledge must be obtained efficiently. After studying ID3 and its improved methods, a new algorithm(Fuzzy ID3 ) and its main concepts are presented to overcome some disadvantage in classical ID3 algorithms. In its application of gate design, fuzzy knowledge gotten by the new algorithm is more efficient than the knowledge by other ID3 algorithms, the set of fuzzy knowledge is much smaller than that of knowledge by classical ID3 algorithms. On the other hand, fuzzy knowledge represents field data more naturally to the way of bar thinking and more robust in tolerating imprecise, conflicting and missing information

Design and Assembly of an Improvised Logic Gates Simulator

This study aimed at designing and assembling an improvised Logic Gates Simulator that can be utilized as an instructional device in basic digital electronics instruction at Caraga State University Cabadbaran Campus, Philippines. This instructional device is believed to enhance the teaching-learning process and would also help address the scarcity of instructional equipment in the school and in the country. Descriptive method of research was employed to come up with the design of the simulator based on the course content of basic digital electronics subject. Acceptability of the improvised simulator based on standards set in this study was?gathered from the experts as respondents using a self-made questionnaire. The data were treated using average weighted mean utilizing parametric scales with verbal descriptions. Findings revealed that the improvised logic gates simulator is highly acceptable in terms of its cost and availability of components,?design and construction,operations, and troubleshooting features. It is concluded that the improvised logic gates simulator is at par in terms of standards on instructional devices based on the evaluation results of experts and is therefore recommended to be used in basic digital electronics instruction. The simulator is an innovative answer and an alternate solution to the scarcity of instructional materials and devices at Caraga State University Cabadbaran Campus.

Design and Implementation of an Efficient Reversible Comparator Using TR Gate

Reversible logic is a new emerging technology with many promising applications in optical information processing, low power (Complementary Metal Oxide Semiconductor) CMOS design, (De Oxy RiboNucleic Acid) DNA computing, etc. In industrial automation, comparators play an important role in segregating faulty patterns from good ones. In previous works, these comparators have been implemented with more number of reversible gates and computational complexity. All these comparators use propagation technique to compare the data. This will reduce the efficiency of the comparators. To overcome the problem, this paper proposes an efficient comparator using (Thapliyal Ranganathan) TR gate utilizing full subtraction and half subtraction algorithm which will improve the computation efficiency. The comparator design using half subtraction algorithm shows an improvement in terms of quantum cost. The comparator design using full subtraction algorithm shows effectiveness in reducing number of reversible gates required and garbage output.

基于相关性分离的逻辑电路敏感门定位算法

随着CMOS器件特征尺寸进入纳米量级,因高能粒子辐射等造成的电路失效问题日益严重,给电路可靠性带来严峻挑战。现阶段,准确评估集成电路可靠性,并以此为依据对电路进行容错加固,以提高电路系统可靠性变得刻不容缓。然而,由于逻辑电路中存在大量扇出重汇聚结构,由此引发的信号相关性导致可靠性评估与敏感单元定位面临困难。该文提出一种基于相关性分离的逻辑电路敏感门定位算法。先将电路划分为多个独立电路结构(ICS);以ICS为基本单元分析故障传播及信号相关性影响;再利用相关性分离后的电路模块和反向搜索算法精准定位逻辑电路敏感门单元;最后综合考虑面向输入向量空间的敏感门定位及针对性容错加固。实验结果表明,所提算法能准确、高效地定位逻辑电路敏感单元,适用于大规模及超大规模电路的可靠性评估与高效容错设计。

基于红外摄像装置的Triniti呼吸门控系统的设计和性能验证

目的通过分析红外摄像装置Triniti呼吸门控系统和腹压带方式下采集的呼吸运动波形及4DCT影像一致性,验证Triniti呼吸门控系统的临床可行性。方法利用CIRS 18023-A呼吸运动模体及配套的CIRS Motion Control软件,导入仿真标准呼吸运动及真实患者的呼吸运动曲线,模拟人体肺部呼吸运动的周期、幅度、频率等,产生不同的呼吸运动模型,并分别用基于腹压带和Triniti呼吸门控系统2种呼吸运动信号触发CT扫描,分析2种装置触发下的4DCT影像一致性,最后根据Triniti系统追踪的呼吸运动,设置门控范围,实现门控治疗。结果2种呼吸运动信号探测装置采集到的呼吸运动波形曲线相关性>0.8(P<0.001),4DCT影像各时相感兴趣区域测量度差异性值为(0.065±0.069)cm,差异无统计学意义(P>0.05)。结论基于红外摄像装置的Triniti呼吸门控系统追踪呼吸精度高,可实现临床呼吸门控治疗,从而有效减少呼吸运动对放射治疗造成的影响。

汽车侧裙板数值成型分析及模具设计

汽车侧裙板长度约为1 m,宽度约为0.1 m,卡扣、加强筋、嵌件孔等复杂结构较多,属于大型细长复杂塑件。大型细长复杂塑件成型难度较大,需要采用数值仿真与模具设计相结合的方法,仿真、设计和验证交叉进行、相互渗透。根据产品的特点拟定了3种进浇方案,仿真结果表明,方案Ⅲ(9点进浇)翘曲变形量最小,其值为4.51 mm。通过验证方案Ⅲ的缩水性、填充时间、填充等值线、填充末端时间差及压力差等参数可知,方案Ⅲ填充均匀、末端压力一致、产品无缩水,表面无质量缺陷,为可行方案。根据方案Ⅲ进行模具设计,包括浇注系统、成型零部件、推出机构、冷却系统等。模具设计完毕后对冷却系统进行验证,结果表明,凸凹模的模温温差小于10℃,模温趋于一致,无翘曲变形风险。基于方案Ⅲ的模具设计可作为最终方案,为模具制造和生产提供方向。

基于模内组装的环式挂链多功能注射模具设计

结合某新款窗帘环式挂链6种组合状态塑件的注射成型要求,基于模内组装设计方法,设计了一副多功能三板注射模具,用作该环式挂链6种组装态产品的注射成型。模具中,模腔由6个独立的单环模腔构成,并且,两环之间的空腔形成90°垂直交叉型环套环状态,有利于通过对各独立模腔浇口的开闭控制,满足6种组装状态组装环挂链的生产要求。为实现对6个模腔浇口的独立开闭控制,设计了一种插板式浇口开闭控制机构,机构由6根插板、1个插座及1个压块组成,用6个螺丝对插板的停留位置进行锁紧。模具能满足单环、2环、3环、4环、5环、6环,共6种组装态的模内直接组装生产要求,具有较好的设计参考价值。

平行闸板阀阀座孔加工专用车削刀具设计及实验研究

平行闸板阀被广泛应用在石油钻采配套装备中。采用普通内孔车削刀具加工平行闸板阀阀座孔,需要调头加工,难以使用切削液,并且由于刀杆刚度和硬度较小引起“颤抖”现象,加工工件时不易保证阀座孔的加工质量和形位公差。基于此设计了一套专用车削刀具,增大刀杆的刚度和硬度,方便使用切削液,而且仅需一次装夹,避免掉头加工,以满足阀座孔的形位公差和加工质量要求。采用有限元法对所设计刀具进行了强度校核。通过实验验证,所设计的刀具可以提高加工效率,满足加工质量和形位公差精度要求。

基于回波幅值信号的医用超声探头性能快速检测系统的研制

目的研制一套基于回波幅值信号的医用超声探头阵元快速检测系统,用以对超声探头性能进行评估与质量控制。方法运用现场可编程门阵列作为系统主控制芯片,以控制系统内部集成的电脉冲激励信号源,进而激励医用超声探头的阵元。阵元振动后产生超声波并在遇到空气后反射。基于超声脉冲回波测试方法,以回波幅值为主要检测参数,实现对超声探头阵元工作状态的检测与评估。结果选取同型号不同使用年限及故障状态的探头进行系统测试,并与所成超声图像进行对比:全新完好探头的回波幅值信号范围为550~575 mV,整体误差小于0.5 dB;使用1年的探头回波幅值信号范围为550~590 mV,较全新探头整体误差低0.6 dB左右;使用3年的探头回波幅值信号中存在十多个3 dB、6 dB及个别10 dB等不同程度的衰减;故障探头中存在三十多个成片连续衰减10 dB阵元。探头衰减位置及程度与所成超声图像缺损位置及程度相对应。结论本系统具有灵敏度高、稳定性好、操作简单快速等特点,在超声探头阵元性能评估方面具有很强的实际应用和推广价值。

錾高水电站工程金属结构布置与设计

錾高水电站为叶尔羌河梯级开发的第二级引水式水电站,金属结构设备数量较多,分布分散,主要介绍錾高水电站工程金属结构的布置、启闭机的选型、闸门的结构设计及埋件设计的思路和方法。目前电站已安全2+a,金属结构设备安全可靠,对后续引水式电站开发建设,有一定的指导意义。

一种铝合金壳体压铸模具设计

通过对壳体零件的结构和成形性分析,重点对模具设计的主要环节进行了详细的分析与研究;分析设计了模具的分型面位置、浇注和排溢系统的结构以及推出机构,采用在侧面厚壁处多点浇口的结构形式;对模具的型芯、型腔做了具体的结构设计,采用型腔在定模、型芯在动模的普通两板式结构形式;并且型芯和型腔部分制作成活动镶件,便于修理、更换,模具结构简单、实用,完全满足模具的设计要求。

液体门控机制及基本性质测定——化学“101计划”表界面性质测量实验新设计

介绍一个涵盖界面化学、物理化学与仪器分析等多学科的基础实验。本实验融合前沿科技成果“液体门控技术”,以自主研发的液体门控教学测试分析仪(压力阈值仪)的设计原理和先进表征技术特性为基础,结合本科生化学“101计划”中的化学测量学实验——液体门控机制及基本性质测定,创新教学模式,丰富化学测量学实验中关于界面科学表征的课程设计。

机场停机位分配问题研究现状与展望

为提高机场场面资源利用效率,大量文章研究停机位分配问题的优化模型与求解算法。首先,概述了停机位分配问题概念。其次,从旅客、机场、航空公司和鲁棒性等不同维度,梳理了停机位分配问题优化目标的研究现状,并归纳了停机位分配问题的约束条件。从数学规划法、智能优化法两个维度综述了停机位分配问题的求解算法,并比较了不同算法优缺点。最后,从考虑交互关系的多目标优化、实现动态实时分配、多资源联合分配、创新优化算法和考虑不确定因素五个方面展望了停机位分配问题研究的发展趋势。

宁夏引黄灌区农业灌溉测控闸门应用现状调查与评估

测控设施作为灌区用水管理的重要工具、数字化灌区建设的基础硬件支撑,可有效帮助管理者准确掌握水源来水及用户实时用水量情况,也可为灌区水费收取、用水总量控制与定额管理提供有力保障。以宁夏引黄灌区测控闸门为例,系统分析其应用现状,重点从提高灌区管理水平、夯实用水权确权成果、提高水费计收透明度等方面总结凝练了取得的主要成效,从设备硬件水平、规划设计、运行维护等方面提出了应用中存在的关键问题,并对今后测控设施选型设计提出了相关意见和建议。

基于Inventor软件的复杂结构闸门三维设计研究与应用

为提高复杂结构闸门工程设计过程中结构应力计算效率及准确性,以某复杂结构弧形闸门工程为研究对象,运用三维建模软件Inventor快速构建复杂结构闸门门体、支臂等主要部位的三维模型,利用ANSYS三维有限元分析软件对复杂结构闸门进行应力分析,获得门体及支臂的应力分布图。对比分析闸门整体结构最大应力数值与材料最大屈服强度,结果表明闸门整体结构强度满足工程设计要求。采用2种软件相结合的方法对复杂结构弧形闸门进行优化设计,不仅缩短复杂结构闸门工程的设计时间,而且有效提高工程的设计质量,为BIM技术在水闸工程及水利工程规划等设计中的推广应用提供借鉴经验和技术支撑。

基于FPGA的软硬件协同纠删码编码加速方案

纠删码容错技术已广泛应用于分布式存储系统,相较于多副本容错技术能显著降低数据存储成本,并且具有更高的数据通信可靠性和安全性,但在数据存储过程中不可避免地会引入额外的计算开销并增加编码时延,导致数据写入吞吐量降低。针对该问题,提出一种基于现场可编程门列阵(FPGA)的纠删码编码加速方案。首先,利用FPGA的高速并行计算优势对纠删码算法进行硬件加速,并实现并行处理和时序优化。然后,针对上位机与FPGA之间因传输速率和处理速率不一致造成内存中的数据溢出问题,在FPGA上拓展了片外DDR3接口用于数据缓存,提高了通信可靠性,并利用DDR3的随机存取特点实现对数据块的分片。最后,设计基于FPGA的纠删码编码硬件加速架构进行实验验证。实验结果表明,与主流Jerasure 2.0开源纠删码库相比,该方案的数据写入吞吐量提升了2.7~93.0倍,尤其对于小文件的编码写入性能提升更为显著。