基于TTCN-3的SIP协议软件测试方法研究

为了更加高效地测试基于SIP(session initiation protocol,会话初始协议)的应用软件,提出了一种通过执行TTCN-3抽象测试套来验证SIP应用程序正确性的新方法.简单介绍了SIP协议和TTCN-3,给出了基于TTCN-3的SIP协议软件测试的设计与实现方法,结合一个具体应用实例详细验证了该方法的可行性.该方法具有可重用、操作简单、执行快捷等特点.     

The Tiny Companion Matters: The Important Role of Protons in Active Transports in Plants

In plants, the translocation of molecules, such as ions, metabolites, and hormones, between different subcellular compartments or different cells is achieved by transmembrane transporters, which play important roles in growth, development, and adaptation to the environment. To facilitate transport in a specific direction, active transporters that can translocate their substrates against the concentration gradient are needed. Examples of major active transporters in plants include ATP-binding cassette (ABC) transporters, multidrug and toxic compound extrusion (MATE) transporters, monosaccharide transporters (MSTs), sucrose transporters (SUTs), and amino acid transporters. Transport via ABC transporters is driven by ATP. The electrochemical gradient across the membrane energizes these secondary transporters. The pH in each cell and subcellular compartment is tightly regulated and yet highly dynamic, especially when under stress. Here, the effects of cellular and subcellular pH on the activities of ABC transporters, MATE transporters, MSTs, SUTs, and amino acid transporters will be discussed to enhance our understanding of their mechanics. The relation of the altered transporter activities to various biological processes of plants will also be addressed. Although most molecular transport research has focused on the substrate, the role of protons, the tiny counterparts of the substrate, should also not be ignored.     

基于TTCN-3的移动业务测试平台的设计

为了克服手工测试的缺点,构建了基于TTCN-3的移动业务测试平台。在参考了TTCN-3通用测试系统模型的基础上,针对移动通信协议设计了专门的编解码器和被测系统适配层,并针对各种操作系统平台设计了通用的平台适配层。提出了被测系统适配层采用并行多实体设计,配合采用Socket连接的TRI接口,实现层二协议的分布式处理。通过一个数据呼叫业务的系统测试实例表明了该平台能有效地完成移动业务通信协议的一致性测试。     

一种基于RBUKF滤波器的SLAM算法一种基于RBUKF滤波器的SLAM算法

同时定位与建图(SLAM)是智能机器人实现真正自治的必要前提,是一个比单独研究定位或者建图更加困难的课题。该文将基于SUT变换的RBUKF滤波器应用于平面静态环境下的同时定位与建图算法,它能够在同样计算复杂度的情况下,避免基于扩展卡尔曼滤波器(EKF)SLAM算法由于线性化误差大导致滤波器发散,从而出现建图错误的缺点。基于公共数据集的实验表明该方法估计的最终地图比EKF的方法精度高。     

Modeling and characterization of a chemomechanical actuator using protein transporter

Plants and animal cells are naturally occurring actuators that exhibit force and motion driven by fluid transport through the cell membrane. The protein transporters embedded in the cell membrane serve as the selective gateway for ion and fluid transport. The actuator presented in this work generates force and motion from mass transport through an artificial membrane with protein transporters extracted from plant cell membranes. The artificial membrane is formed from purified 1-Palmitoyl-2-Oleoyl-sn-Glycero-3-[Phospho-l-Serine] (Sodium Salt) (POPS), 1-Palmitoyl-2-Oleoyl-sn-Glycero-3-Phosphoethanolamine (POPE) lipids and supported on a porous substrate. The protein transporter used in the actuator membrane is a proton–sucrose cotransporter, SUT4, extracted from yeast cells genetically modified to grow the cotransporter in their cell membranes. The SUT4 transporter conducts proton and sucrose from the side of the membrane with higher concentration and carries water molecules across the membrane. It is observed from transport characterization experiments that fluid flux through the membrane varies with the applied sucrose concentration and hence is chosen as the control stimulus in the actuator. A modified four-state facilitated diffusion model is applied to the transport characterization data to compute the two characteristic parameters for fluid transport, saturation concentration and translocation rate, through the membrane. The flux rate through the membrane is observed to increase with the concentration until a particular value and saturates at a higher concentration. The saturation concentration for the actuator is experimentally found to be 6±0.6 mM sucrose on the side with lower pH. The corresponding maximum translocation rate is found to be 8.5±1.2 nl/ g cm² min. The maximum steady state deformation measured on the actuator is 60 m for 30 mM sucrose that corresponds to a force of 0.89 mN.     

Rice SUT and SWEET Transporters

Sugar transporters play important or even indispensable roles in sugar translocation among adjacent cells in the plant. They are mainly composed of sucrose–proton symporter SUT family members and SWEET family members. In rice, 5 and 21 members are identified in these transporter families, and some of their physiological functions have been characterized on the basis of gene knockout or knockdown strategies. Existing evidence shows that most SUT members play indispensable roles, while many SWEET members are seemingly not so critical in plant growth and development regarding whether their mutants display an aberrant phenotype or not. Generally, the expressions of SUT and SWEET genes focus on the leaf, stem, and grain that represent the source, transport, and sink organs where carbohydrate production, allocation, and storage take place. Rice SUT and SWEET also play roles in both biotic and abiotic stress responses in addition to plant growth and development. At present, these sugar transporter gene regulation mechanisms are largely unclear. In this review, we compare the expressional profiles of these sugar transporter genes on the basis of chip data and elaborate their research advances. Some suggestions concerning future investigation are also proposed.     

基于TTCN-3的手机网络应用软件测试方法研究

介绍了手机网络应用软件的主要开发技术,概述了TTCN-3标准规范中的TTCN-3核心语言、TTCN-3运行时接口和TTCN-3控制接口的基本概念,并在对手机网络应用软件网络连接方式分析的基础上,提出了基于TTCN-3的手机网络应用软件测试方法,说明了使用TTCN-3测试手机网络应用软件的测试流程.通过给出一个手机网络应用软件的测试实例,展示了这种测试方法的可行性.