Design and Implementation of a FTTH System Based on Passive Optical Network

本研究课题属于通信网络接入网应用领域，研究基于无源光网络技术（PON）的光纤到户系统（FTTH）的设计与实现。无源光网络技术是在所谓的“最后一公里”中缺少带宽时的解决方案。家庭用户为了获得快速因特网接入、高质量视频节目、视频会议、实时游戏、HDTV、网真等视频业务，对网络接入带宽提出了更高的要求，PON提供了这种解决方案。 基于无源光网络技术的光纤到户系统的设计与实现，可在FTTH网络建设中，根据场景的业务需求快速进行网络规划、光分配网（ODN）部署、语音业务实现、数据业务实现、安全性规划、网管业务下发等。不但提高了网络建设速度，提升了服务水平，有效降低了投诉，对抢占市场先机等极具意义。 ...This research is communications network access network applications, development of passive optical network based on FTTH technology, system design and implementation. PON is a passive optical network system in the so-called "last mile" in the lack of bandwidth solutions. Home users to get fast Internet access, high-quality video, video conferencing, real-time games, HDTV, telepresence and other v...学位：工程硕士院系专业：软件学院_工程硕士(软件工程)学号：X200923052

A Improved Study on Replenishment Strategy of Company A Based on CPFR

市场需求的不确定性以及零售商和供应商之间肤浅的合作关系，导致零售企业出现了高库存和缺货情况并存的问题。单靠零售企业的能力，难以解决涉及整条供应链的库存难题。于是，随着供应链协同理论的发展，CPFR逐渐兴起。与传统的库存管理相比，CPFR更加注重供应链节点企业间的协同运作。随着竞争的加剧，加上可口可乐、宝洁等大型供应商的要求，国内零售企业实施CPFR是必然趋势。 本文以此为背景，在综述相关理论的基础上，将国内一家大型连锁超市作为研究对象，对企业实施CPFR过程中的补货策略进行研究。首先，从补货商品情况、补货系统、补货流程等方面分析了A公司补货管理现状，研究其中存在的问题和原因。然后，立足于时间...Because of the uncertainty of the demand and the superficial cooperation between retailers and suppliers, high inventory and goods shortage occur at the same time. Retailers can’t solve the inventory problem involving the whole supply chain by themselves. Therefore, with the development of the supply chain collaboration theory, Collaborative Planning Forecasting and Replenishment (CPFR) springs up...学位：工程硕士院系专业：管理学院_物流工程学号：1772011115112

供应链协同知识创新研究综述

供应协同知识创新在企业竞争中处于核心地位,它不仅是创造新价值的根本途径,也是产生和维持供应链竞争优势的有效战略。首先介绍供应链协同和知识创新的相关理论基础,在此基础上,分析供应链协同知识创新发展的过程,建立供应链协同知识创新的网络模型;最后列举基于模块化供应链协同知识创新模型,说明企业应如何整合外部知识资源,来提高企业供应链协同知识的创新能力,目的是使企业在激烈的竞争中获得优势

Application of PLC in Hydraulic Power Sliding Table Control System

阐述了液压动力滑台的工作原理及可编程序控制器(PLC)在控制系统中的应用、PLC控制的硬件结构和程序设计。The application of PLC in the hydraulic power sliding table control system was introduced and its principles, the hardware structure and the procedure design were discussed

厦门市居民2002-2009年伤害死亡分析

目的分析厦门市居民2002-2009年伤害死亡的流行病学特征,为伤害预防和控制决策的制定提供科学依据。方法利用厦门市居民2002-2009年死亡资料,采用国际疾病分类法(ICD-10)进行编码,计算伤害的死亡率、人群分布特征和疾病负担等指标,分析导致伤害死亡的主要原因。结果 2002-2009年,厦门市伤害死亡率为43.52/10万,标化死亡率为38.40/10万,居死因顺位的第5位。潜在减寿年数(potential years of life lost,PYLL)为149 531年,PYLL率为11.85‰,平均PYLL为0.012人年/人。在伤害中,交通事故死亡率15.72/10万,居第1位,其他依次是自杀(11.04/10万)、意外跌落(7.45/10万)、溺水(2.24/10万)、意外中毒(1.32/10万)。少年儿童组首位伤害死因是溺水,中青年组为交通事故,老年组为意外跌落。结论伤害已成为厦门市居民第5位死因,不同年龄段人群伤害主要死因不同,应有针对性的采取干预措施以降低其死亡率和疾病负担

AGR2: A New Biomarker of Cancer Diagnosis

Agr2(AnTErIOr grAdIEnT-2)是一种分泌蛋白,广泛存在于前列腺、乳腺、肺和胰腺等腺体组织,并在这些腺体的肿瘤组织过量表达,与肿瘤细胞的存活、生长和转移相关。临床上,Agr2的表达与乳腺癌、前列腺癌、胰腺癌等癌症的发展和预后相关,被认为是一个很有前途的早期诊断和判定预后的标志性基因。该文就目前Agr2的研究现状,尤其是肿瘤相关的功能、机制和临床调查上的最新研究进展加以综述。AGR2 is a secreted protein and widely found in the prostate, breast, lung and pancreatic gland tissue.It has excessive expression in the tumor tissue of these glands and regulates tumor cell survival, growth and metastasis.Clinical expression of AGR2 in breast cancer, prostate cancer and pancreatic cancer is relative to the progress of tumor development.Thus, AGR2 is considered to be a promising biomarker for early diagnosis and prognosis.In this paper, we reviewed the current research status of AGR2, especially tumor related functions, clinical investigation and mechanisms.科技部国家重大基础研究计划项目(批准号:2010CB945004)资助的课题~

Synthesis and Crystal Structure of a Novel Self-assembled1,4-dimethyl Cucurbituril Silver(I) Complex

Crystals of a new 1,4-dimethyl cucurbituril(TMeQ6) with Silver(I) ion were synthesized, and the structure was determined by X-ray diffraction technique. There are two kinds of TMeQ6 A and B which formed molecular encapsulates with two silver ion lids in the self-assembled entities. One dimensional supramolecular tubes are formed from the encapsulates A, and two dimensional molecular sieves are formed from the encapsulates B, the tubes and the sieves stack together alternately in the self-assembled entities. CCDC: 271401.国家自然科学基金资助项目(No.20362003);; 科技部国际科技合作重点项目计划(No.2003DF000030);; 贵州省省长资金项目;; 贵州省国际科技合作重点项目计划(No.2005400101

A Molecular Bowl with Barium Ion As Bottom

A molecular bowl with barium ion covering one portal of decamethylcucurbit[5]uril as a‘metal-ion- bottom’has been synthesized. The structure of the molecular bowl has been confirmed by the single crystal X-ray diffraction determination. It belongs to orthorhombic with space group of Pna21. The crystal unit cell parameters are: a=3.2108(6) nm, b=1.4742(3) nm, c=1.1516(2) nm, and V=5.4509(18) nm3, Dc=1.677 Mg·m-3, Z=4, F(000)= 2832, R=0.0551, wR=0.1568. CCDC: 290552.国家自然科学基金资助项目(No.20362003);; 科技部国际科技合作重点项目计划(No.2003DF000030);; 贵州省省长资金项目;; 贵州省国际科技合作重点项目计划(No.2005400101)

Transition Metal Promoted ZSM-5 Catalysts for the Conversion of Dimethyl Sulfide into Methanethiol

负载过渡金属的zSM-5催化剂用于催化甲硫醚(dMS)转化成甲硫醇(MT)的反应.实验结果表明,催化剂的甲硫醚转化率提高和甲硫醇选择性降低的趋势一样,都是以下顺序:CO/zSM-5>MO/zSM-5>nI/zSM-5>W/zSM-5.表征结果表明,由于过渡金属阳离子(W6+、nI2+、CO3+、MO6+)比Al3+活泼,而改性过程中W6+、nI2+、CO3+、MO6+分别代替了部分Al3+,使得改性催化剂对dMS和MT的化学吸附作用更强.过渡金属的引入使得zSM-5总酸度增强,提高了C―S键的裂解能力,从而改进了催化转化dMS的能力.研究结果发现,在转化dMS的过程中,金属活性位和酸性位之间通过强的协同效应起作用.ZSM-5-supported transition metal catalysts were prepared and used to catalyze the conversion of dimethyl sulfide(DMS) into methanethiol(MT).Test results indicated that the activities of the catalysts for the conversion of DMS increased as follows: Co/ZSM-5>Mo/ZSM-5>Ni/ZSM-5>W/ZSM-5.The decrease in MT selectivity followed the same trend.The characterization results showed that transition metal cations(W6 +, Ni2 +, Co3 +, Mo6 +) replaced some Al3 +sites leading to more active in chemiadsorption of DMS and MT since transition metal cations are more active than Al3 +.The incorporation of transition metals into ZSM-5enhances the total acidity of ZSM-5 and increases its capacity to rupture C―S bonds.This subsequently improves its catalytic behavior in the conversion of DMS.We found that the metal active sites and closely situated acidic sites have a strong synergistic effect when converting DMS

Study of the Interaction of Disubstituted Cucurbit[6]uril with 2-(Aminomethyl)pyridine

分别用核磁共振、紫外可见吸收和X射线单晶衍射方法研究对称四甲基六元瓜环与2-氨基甲基吡啶的相互作用及其结构特征.1HNMR谱图和紫外可见吸收光谱图清晰表明,2-氨基甲基吡啶与对称四甲基六元瓜环有明显的相互作用,客体2-氨基甲基吡啶的吡啶环部分进入了瓜环空腔,1HNMR谱图相关质子峰的积分强度以及客体吸光度随主体瓜环浓度变化明确表示它们之间形成了1∶1的包结配合物,此包结比并不随瓜环的浓度增加而改变.X射线单晶衍射法对包结配合物晶体的测定进一步证实了核磁共振、紫外可见吸收方法所得结论.Interaction and structure of a host-guest inclusion complex of symmetrical tetramethyl substi- tuted cucurbit[6]uril (TMeQ[6]) with 2-(aminomethyl)pyridine (amp) have been studied by using 1H NMR technique, UV-visible spectrophotometry and single crystal X-ray diffraction determination. The experimen- tal results from 1H NMR and UV-visible spectra revealed that the amp as a guest enters into the cavity of TMeQ[6] to form a host-guest inclusion complex of TMeQ[6] and amp with a constant ratio of 1∶1. The single crystal X-ray diffraction determination further confirmed the conclusions.国家自然科学基金(Nos.200261002,20362003);; 科技部国际科技合作重点计划(No.2003DF000030);; 贵州省省长资金;; 贵州省教育厅自然科学研究资助项目