Survey of location-centric target tracking with mobile elements in wireless sensor networks

介绍目标跟踪的过程以及移动跟踪的特点;通过区分目标定位为主的方法和目标探测为主的方法,介绍定位为主的移动式目标跟踪方法(称为目标的移动式定位跟踪; )的研究现状;分析和比较不同方法的特点和应用领域,发现现有方法虽然可以提高跟踪质量、降低网络整体能耗,但是还存在一些问题。基于此,总结目标的移动; 式定位跟踪方法在方法类型、网络结构和节点模型等方面可能存在的研究热点,指出其研究和发展趋势。The basic process of target tracking and the properties of tracking; solutions with mobile elements were introduced. By distinguishing; location-centric methods and detection-centric methods, the current; research status of the location-centric target tracking methods were; reviewed. The properties and application fields of different solutions; were analyzed and compared. Although the existing solutions can; significantly improve tracking quality and reduce energy consumption of; the whole network, there are also some problems. Based on these; discoveries, some possible research hotspots of mobile solutions were; summarized in many aspects, such as method types, network architecture,; node model, and so on, indicating the future direction of research and; development.国家自然科学基金资助项目; 国家科技支撑计划项

Research Advance of Target Tracking with Mobile Elements in Heterogeneous Wireless Sensor Networks

传统固定无线传感器网络在进行目标跟踪过程中面临跟踪质量较低、网络能耗较高等问题.引入移动节点后所组成的异构无线传感器网络提供了新的解决方法,即移; 动式目标跟踪.目前的研究大多对被跟踪目标的探测和定位混为一谈,本文区分了以探测为主和以定位为主的两类方法,着重介绍以探测为主的移动式目标跟踪方法; 的研究现状.通过对比现有方法在跟踪质量和网络能耗等方面的优缺点,揭示了现有研究存在的问题.总结了移动式目标跟踪领域存在的研究热点和趋势.Traditional stationary wireless sensor networks usually encounter some; problems during the process of target tracking,such as low tracking; quality, high energy consumption and so on. More and more mobile; elements, i. e., mobile sensors, are used to build up heterogeneous; wireless sensor networks and thus bring new solutionsfor target; tracking. Existing researches usually misidentify detecting the target; with locating the target. After distinguishing between detection-centric; and localization-centric methods,we review specifically the current; research status of the detection-centric target tracking methods. By; comparing existing methods'merit and demeritin aspects like tracking; quality, energy consumption, etc.,their problems are revealed.; Therefore, we summarize some possible research hotspotsand tendency of; mobile solutions in many aspects.国家自然科学基金重点项目; 国家科技支撑计划项目; 国家自然科学基金项目; 福建省自然科学基金计划项

Theoretical Study on Intramolecular Proton Transfer Reaction in 2-(2-Mercaptophenyl)benzoxazole

在b3lyP/6-31g(d,P)水平上研究了2-(2-巯苯基)苯并噁唑气态中五种异构体(E1,E2,E3,E4和k)在气态中的稳定性及其在基态下的质子转移,同时结合极化连续介质模型(PCM)研究了水、二甲亚砜、乙腈、乙醇、苯胺和环己烷等对2-(2-巯苯基)苯并噁唑溶剂化作用的影响.研究结果表明,醇式异构体E1为2-(2-巯苯基)苯并噁唑的优势构型;在E1向k(酮式异构体)转变过程中,存在一个较小的能垒;当考虑零点振动能(zPVE)后,逆向能垒消失.在溶液中,随着溶剂极性的增强,醇式异构体E1与k之间的反应平衡向k方向移动,在非极性溶剂环己烷中,E1为优势构型,而在强极性水溶液中,k为优势构型。The tautomers(E1,E2,E3,E4,and K) and the ground state intramolecular proton transfer reaction of 2-(2-mercaptophenyl)benzoxazole were studied at the B3LYP/6-31G(d,p) level.The effect of solvent(water,dimethylsulfoxide,acetonitrile,ethanol,aniline,and cyclohexane) was studied at the B3LYP/6-31G(d,p) level,using the polarizable continuum model.The results of density functional calculations indicate that the enol form E1 is the most stable tautomer at the ground state.In these solvents there is an equilibrium for 2-(2-mercaptophenyl)benzoxazole in the ground state between E1 and K,and the equilibrium shifts toward the tautomer K as the polarity of the solvent increases.E1 is the preferential conformation in cyclohexane,but K is the more stable tautomer in water.国家自然科学基金(Nos.20772027;20803020);973子课题(No.2003CB716005);中国博士后科学基金(No.20070410805)资助项

靶向人类免疫缺陷病毒1型(HIV-1)整合酶多肽药物表达载体的构建

目的构建人类免疫缺陷病毒1型(HIV-1)整合酶(IN)表达载体用于双分子荧光互补技术筛选多肽药物。方法PCR扩增HIV-1 IN的全长基因序列,将目的片段插入至pBiFc-VN173载体中,并对重组质粒pBiFc-VN173-IN进行双酶切及测序鉴定。将重组质粒pBiFc-VN173-IN和对照组质粒pBiFc-VN173分别转染HEK293T细胞,采用Western blot法和免疫荧光细胞化学染色法检测IN的表达。结果通过高保真PCR、载体构建和鉴定,成功获得IN表达载体pBiFc-VN173-IN。与对照组相比,通过Western blot法和免疫荧光细胞化学染色法证实转染质粒pBiFc-VN173-IN载体的HEK293T细胞表达IN。结论成功构建了IN表达载体,该载体可用于和IN相互作用的多肽药物的双分子荧光互补技术筛选。福建省教育厅中青年教师教育科研项目(JAT171033

茶陵方言中的几个人称代词

茶陵方言的人称代词主要有"我、你、渠"等。人称代词的"复数形"后缀"南"的用法比较特别,和普通话的后缀"们"用法有很多不同之处。它不是一个"复数形式"标记,而是一个表集体概念的语素

An Error Analysis on Chinese Auxiliary Word le Used by Vietnamese Students

文章从越南学生作文语料中选取了545个“了”的偏误用例，对这些偏误进行了分类归纳和数量统计，并对其产生的原因进行了探讨和分析，发现越南留学生在习得“了”的过程中最主要的偏误形式是遗漏“了”，即存在着严重的标注不足现象，这体现出母语干扰的强势作用。This paper selects 545 error examples of le from the compositions written by Vietnamese students, sums up the error types and counts the proportion of each error type, then analyzes the reasons for the occurrence of errors. We find out the main error type is lacking le. This means there is the serious situation of underuse. It reflects strong mother-tongue influence

A Study on the Vietnamese Learners＂ Acquisition of the Chinese Character ＂了 （le）＂

通过考察作文等自然语料对越南学习者"了"的习得进行研究。研究发现,越南学习者习得"了"最主要的问题是遗漏,"了1""了2"都是如此,并且"了1"遗漏比"了2"更严重。对带"了"的各语法次结构习得情况考察发现,越南学习者习得最好的是"Adj+了2""不+了2",其次是"V+了2""V+O+了2""V+了1+O",最差的是"V+了1+数量（+O）""V1+了1（+O）+V2"。对此就对越汉语教学及教材编写中"了"的选项与排序提出了参考建议。Based on an investigation of natural linguistic materials, such as compositions, this paper studies the Vietnamese learners＇ acquisition of the Chinese character ＂T （le）＂, finding that omission is the main error in the Vietnamese learners＂ acquisition of the Chinese character ＂了＂＂, which occurs in both ＂了 1＂ and ＂了 2＂, with ＂了 1＂ being omitted more frequently than ＂了 2＂. The acquisition investigation of va- rious grammar substructures with ＂7＂＂ indicates that for Vietnamese learners, the structures that they acquire best are ＂Adj-t- 7＂ 2＂ and ＂;不（not）＋T 2＂, followed by ＂V＋-;了2＂, ＂V＋O了2＂ and ＂V＋了1＋ O＂, while the worst are ＂V＋了1 ＋ number （ 4- O）＂, ＂ V1 ＋ 了1 （4- O）＋V2＂. Accordingly, this paper puts forward some suggestions on the selection and ordering of ＂了＂ in practice and materials of TCAFL （teaching Chinese as a foreign language） in Vietnam.教育部哲学社会科学研究重大课题攻关项目“全球汉语中介语语料库建设和研究”(项目编号:12JZD018

一种金属基颗粒增强构件的增材制造方法

本发明公开了一种金属基颗粒增强构件的增材制造方法，包括在底部带有喷嘴的坩埚中熔化金属、然后加入陶瓷颗粒、设置一个可作三维运动的水平基板、设置水平基板控制程序、通过施加一定压力使含有陶瓷颗粒的金属熔体从喷嘴中流出、熔体逐层凝固、堆积成形等步骤。本发明通过在金属熔体中添加不与其发生化学反应的陶瓷颗粒，通过陶瓷颗粒的尺寸和体积分数来控制熔体的粘度，达到控制流动与成形的目的，解决了过去层间结合不好、不利于成形等问题，提出了一种金属基颗粒增强构件的制备新方法

一种金属基原位自生颗粒增强构件的增材制造方法

本发明公开了一种金属基原位自生颗粒增强构件的增材制造方法，包括在底部带有喷嘴的坩埚中熔化金属，加入两种以上两种单质颗粒，通过颗粒之间的化学反应，生成不溶于金属的原位自生颗粒，形成原位自生颗粒，设置一个可作三维运动的水平基板，设置水平基板控制程序，施加一定压力使含有原位自生颗粒的金属熔体从喷嘴中流出，熔体逐层凝固，堆积成形等步骤。本发明通过在金属熔体中添加的单质颗粒之间以及单质颗粒与金属熔体之间的化学反应得到原位自生颗粒，再通过原位自生颗粒的尺寸和体积来控制金属熔体的粘度，达到控制流动与成形的目的，解决了过去层间结合不好、不利于成形等问题，提出了一种金属基原位自生颗粒增强构件的制备新方法