基于LonWorks技术的智能节点设计

LonWorks智能节点是LonWorks现场总线的一个非常重要的组成部分,本文介绍了一种Host—Based结构的LonWorks智能节点的设计方法。并采用Motorola公司生产的MC143150神经元芯片,主要负责Lon网络通信;采用DSP芯片TMS320F240作为主处理器,它能够大大提高LonWorks节点的数据处理和控制的能力。     

基于“嵩山”超级计算机系统的大规模管网仿真

供水管网仿真广泛应用于城市供水输配调度,是城市供水管网监测与维护的重要技术手段。由于在面向城市级的大规模管网中产生了海量的计算数据,因此在一般计算平台上无法满足管网仿真计算的算力需求。为提升城市级供水管网仿真的计算效率,提出一种有效的并行化方案。基于“嵩山”超级计算机系统采用中央处理器+数据缓存单元（CPU+DCU）架构,利用其在密集数据计算方面的优势,对“嵩山”超级计算机进行供水管网仿真。参照可移植性异构计算接口（HIP）异构编程模型,在“嵩山”超级计算机上实现供水管网仿真的异构计算,并结合管道数据分割方案,使用消息传递接口开启多进程以实现DCU加速数据通信传递。通过重定义数据类型解决计算过程中结构体传输问题,实现单节点内多DCU的大规模密集计算。在不同计算平台和多种计算策略仿真上的对比结果表明,与传统x86平台相比,该优化方案在小规模数据与大规模数据上的加速比分别达到5.269、10.760,与采用计算统一设备架构异构编程模型的传统GPU异构平台相比,计算性能有明显提高。     

Formulation and development of ophthalmic in situ gel for the treatment ocular inflammation and infection using application of quality by design concept

Context: The conventional liquid ophthalmic delivery systems exhibit short pre-corneal residence time and the relative impermeability to the cornea which leads to poor ocular bioavailability.

Objective: The aim of this study was to apply quality by design (QbD) for development of dexamethasone sodium phosphate (DSP) and tobramycin sulfate (TS)-loaded thermoresponsive ophthalmic in situ gel containing Poloxamer 407 and hydroxyl propyl methyl cellulose (HPMC) K4M for prolonging the pre-corneal residence time, ocular bioavability and decreases the frequency of administration of dosage form. The material attributes and the critical quality attributes (CQA) of the in situ gel were identified. Central composite design (CCD) was adopted to optimize the formulation.

Materials and methods: The ophthalmic in situ forming gels were prepared by cold method. Materials attributes were the amount of Poloxamer 407 and HPMC and CQA identified were Gel strength, mucoadhesive index, gelation temperature and % of drug release of both drug.

Results and discussion: Optimized batch (F*) containing 16.75% poloxamer 407 and 0.54% HPMC K4M were exhibited all results in acceptable limits. Compared with the marketed formulation, optimized in situ gel showed delayed T_max, improved C_max and AUC in rabbit aqueous humor, suggesting the sustained drug release and better corneal penetration and absorption.

Conclusion: According to the study, it could be concluded that DSP and TS would be successfully formulated as in situ gelling mucoadhesive system for the treatment of steroid responsive eye infections with the properties of sustained drug release, prolonged ocular retention and improved corneal penetration.     

纳米氧化铜/辛酸-肉豆蔻酸相变储能材料的制备及热物性

辛酸(OA)-肉豆蔻酸(MA)是一种极有发展潜力的相变材料,但是因过低的导热系数限制了其进一步大规模推广。通过添加纳米氧化铜(CuONP)改善其导热性,制备了一种融化温度在7~9℃的可用于空调蓄冷系统的新型相变储能材料。利用理论模型预测OA-MA二元共熔体系的融化温度与相变潜热,发现计算结果与实验不符。对比不同分散剂对CuONP的分散效果,发现白猫洗洁精分散效果最好。通过步冷试验、差示扫描量热法(DSC)、瞬态平面热源法(Hotdisk)及加速热循环实验,对比不同质量比CuONP对OA-MA在宏观热表现、融化温度、相变潜热、导热系数与热扩散率等方面的影响来研究纳米流体的传热传质机理,并提出了热扩散率与相变潜热的拟合曲线;根据材料300次与600次循环后的融化温度与相变潜热,发现该材料循环热稳定性较好。     

Analysis and evaluation of a general camera model

A versatile General Camera Model, GCM, has been developed, and is described in detail. The model is general in the sense that it can capture both fisheye and conventional as well as catadioptric cameras in a unified framework. The camera model includes efficient handling of non-central cameras as well as compensations for decentring distortion. A novel way of analysing radial distortion functions of camera models leads to a straightforward improvement of conventional models with respect to generality, accuracy and simplicity. Different camera models are experimentally compared for two cameras with conventional and fisheye lenses, and the results show that the overall performance is favourable for the GCM.     

基于Mega169的空调控制器的设计

采用单片机技术,设计了一种车用空调控制器.控制器可对空调的各个部件进行控制,实现制冷制热、调整风量及控制风口的变换等操作.系统采用液晶显示屏显示,由程序控制实现各个环节的功能,方便了汽车驾驶员的操作.该设计具有很高的实用价值,可适用于现有的大多数汽车以及工程车.     

基于CAS集群的单点失效问题解决方案

单点登录(SSO)可以消除多个应用服务系统之间的重复认证过程,但会加重认证负载,引起单点失效的风险,导致服务中断。针对上述问题,提出具有集群功能的单点登录系统,将用户登录请求分发到不同的单点登录服务器,解决单个单点登录服务器负担过重的问题,增强系统运行的稳定性。     

基于LabVIEW的空调水系统优化控制策略研究

在对空调水系统中的压差控制与温差控制两种控制策略进行分析后,为提高系统节能效果,将串级控制方法引入到空调水系统控制中;以西安建筑科技大学变风量空调实验室内的冷冻水系统为对象,提出用最小二乘法辨识串级回路主、副环的传递函数模型,并在此基础上,基于LabVIEW软件对控制系统进行仿真分析和实验研究;仿真和实验结果证明了串级控制策略在空调水系统控制中的有效性和良好的应用价值。     

基于多Agent的医疗信任模型的模拟

结合直接交互信任评价和第三方信誉推荐,提出了一种基于多Agent技术的医疗信任模拟模型。使用置信因子来综合直接交互信任值和第三方信誉推荐值;避免了患者直接交互的盲目性和巨额计算,完善了对医生自我推荐的辨别能力。实验采用Swarm仿真平台模拟医疗信任模型的交互过程,结果表明该模型在确定信任关系中相对IT模型要快,比第三方信誉推荐模型相对要可靠。     

LON仿人思维控制器设计与实现

新型智能控制仪表的发展趋势是基于人工智能,人工智能在控制领域的应用核心是模拟人的控制智慧。LON仿人思维控制器是基于LonWorks总线的智能控制器,模拟了人的控制思维与智慧,体现了仿人思维控制理论与方法研究成果。控制器采用双CPU设计,将嵌入式技术与LonWorks总线技术有机结合在一起,可以实现模拟信号、开关信号及其脉冲信号的输入、输出,可与其它控制仪表实现RS-232、USB、LonWorks总线通讯。LON仿人思维控制器集成了独有的仿人思维控制算法,既可以单独使用,也可以构成拟人化分布式智能控制系统。实验结果表明,LON仿人思维控制器对温度、压力、流量、液位等过程工业物理量有很好的控制效果。