NS2

摘要： In this research, we have projected and carried out a novel fishbone network that shows better performance in the term of minimizing the packet delay with respect to sink speed. Previous study implies that sector angle affects greatly on designing fishbone network. Finite Set of nodes arranges to sense the physical condition of any system is called wireless sensor. Our designed fishbone network can be potentially applied for a wireless sensing system to formulate a whole network. The network is a novel design which has been finalized by comparing sector angle. Analysis takes place by varying packet delay according to sink speed. Future analysis takes place for Quality of Service (QoS) and Quality of Experience (QoE). Latency of Packet and its size is the measurement criteria of any network or service is called Quality of Service (QoS). On the other hand the user experience of using the designed network is called Quality of Experience (QoE). Our designed network has been analyzed in TCP Tracer to find out the latency or packet delay for different users. The user data has been shorted and equated among them for latency with different no of packets. Our proposed spiral fishbone network shows better QoS and QoE. In future more nodes can be added to design extended fishbone network for wireless.

摘要： 船舶通信网络承载着船舶通信、导航、内部系统控制等关键功能,通信网络的质量直接决定了船舶的工作状态,由于船舶通信受到海上恶劣的气象条件影响,网络的时延、数据丢包等问题一直是行业内的研究热点。支持向量机是一种较为先进的数据整理和分类技术,本文结合最小二乘法与支持向量机技术,建立了船舶通信网络的丢包率预计模型,结合NS2软件进行了通信网络的丢包率预测,并获得了与实际测量数据较为接近的预测效果。

摘要： ZigBee网络的随机地址分配机制采用随机算法为节点分配地址,其具有逻辑复杂度低、实现方便、无须参数等优点,但同时会造成较大的通信开销和时间消耗,且未能对重复地址做出有效清理。对此,文章提出新型随机地址分配算法,能有效地控制通信开销和时间消耗,且能对重复地址信息进行清理。最后,在NS2软件上进行模拟仿真,测试数据证明了新提出的算法的有效性和可行性。

摘要： 隐藏节点问题是Ad Hoc网络技术教学的一个重要内容,它涉及对CSMA/CA协议和RTS/CTS机制这两个重要理论的理解,因此非常有必要通过实验的方式帮助学生学习和理解.利用NS2仿真软件实现对隐藏节点问题的仿真,通过实验展示了隐藏节点问题产生的原因及其带来的危害,分析了CS-MA/CA协议的基本工作过程和RTS/CTS机制的基本原理.详细介绍了利用NS2设计隐藏节点仿真实验的关键过程和方法,实验数据的处理以及实验结果的对比分析.实践证明,通过该实验不仅有利于帮助学生理解隐藏节点问题,更有助于学生建立规范的科学研究方法,增强了学生操作动手能力,并激发了学生学习的积极主动性.

摘要： Ad-Hoc网络是一种无线自组织网络,它的组网方式非常灵活,应用范围非常广泛.但是无线网络中各节点数据传输冲突造成时隙资源的无序争用和浪费,网络质量大打折扣.目前,采用CSMA/CA协议是解决节点数据传输冲突问题的方法之一.为深入了解CSMA/CA协议的优势,文章研究了隐藏节点、暴露节点问题和RTS/CTS握手机制.在NS2模拟环境下,针对节点问题分别建立不同的网络拓扑结构,在节点固定的情况下对CSMA/CA协议性能进行分析.

摘要： Broadcasting is a basic technique in Mobile ad-hoc network(MANET),and it refers to sending a packet from one node to every other node within the transmission range.Flooding is a type of broadcast where the received packet is retransmitted once by every node.The naive flooding technique,floods the network with query messages,while the random walk technique operates by contacting the subsets of every node’s neighbors at each step,thereby restricting the search space.One of the key challenges in an ad-hoc network is the resource or content discovery problem which is about locating the queried resource.Many earlier works have mainly focused on the simulation-based analysis of flooding,and its variants under a wired network.Although,there have been some empirical studies in peer-to-peer(P2P)networks,the analytical results are still lacking,especially in the context of P2P systems running over MANET.In this paper,we describe how P2P resource discovery protocols perform badly over MANETs.To address the limitations,we propose a new protocol named ABRW(Address Broadcast Random Walk),which is a lightweight search approach,designed considering the underlay topology aimed to better suit the unstructured architecture.We provide the mathematical model,measuring the performance of our proposed search scheme with different widely popular benchmarked search techniques.Further,we also derive three relevant search performance metrics,i.e.,mean no.of steps needed to find a resource,the probability of finding a resource,and the mean no.of message overhead.We validated the analytical expressions through simulations.The simulation results closely matched with our analyticalmodel,justifying our findings.Our proposed search algorithm under such highly dynamic self-evolving networks performed better,as it reduced the search latency,decreased the overall message overhead,and still equally had a good success rate.

摘要： 车载自组织网络是一种典型的移动自组织网络,由于无线信道完全开放,易受恶意节点的攻击.基于信任模型的路由协议可以提供一条不包含恶意节点的可信路由,从而提高路由协议的安全性.该文提出了一种基于信任模型改进的AODV协议,利用信任模型的主观逻辑评估车辆节点间的可信度,为选择出安全可信路由提供决策依据.通过仿真验证,TAODV路由协议算法提高了数据包传递率和平均吞吐量.

摘要： The problem of data packet dropouts induced by rncommunication channel in networked control systems rn(NCS) was studied.rnNCS with packet dropouts was modeled as Markov jump rnlinear system (MJLS) and the H∞ control techniques rnof NCS were rnestablished based upon the bounded real lemma of rnMJLS. The state feedback controller was computed by a rnnecessary and sufficient rnlinear matrix inequality condition. Using the rnsoftware NS2 to simulate real network performance, we rndesigned and implemented a rnnew real-time simulation platform for NCS. An rnexperiment was carried out on the platform and the rnsimulations have demonstrated rnthe effectiveness of the proposed approach.

摘要： The problem of data packet dropouts induced by rncommunication channel in networked control systems rn(NCS) was studied.rnNCS with packet dropouts was modeled as Markov jump rnlinear system (MJLS) and the H∞ control techniques rnof NCS were rnestablished based upon the bounded real lemma of rnMJLS. The state feedback controller was computed by a rnnecessary and sufficient rnlinear matrix inequality condition. Using the rnsoftware NS2 to simulate real network performance, we rndesigned and implemented a rnnew real-time simulation platform for NCS. An rnexperiment was carried out on the platform and the rnsimulations have demonstrated rnthe effectiveness of the proposed approach.

摘要： The problem of data packet dropouts induced by rncommunication channel in networked control systems rn(NCS) was studied.rnNCS with packet dropouts was modeled as Markov jump rnlinear system (MJLS) and the H∞ control techniques rnof NCS were rnestablished based upon the bounded real lemma of rnMJLS. The state feedback controller was computed by a rnnecessary and sufficient rnlinear matrix inequality condition. Using the rnsoftware NS2 to simulate real network performance, we rndesigned and implemented a rnnew real-time simulation platform for NCS. An rnexperiment was carried out on the platform and the rnsimulations have demonstrated rnthe effectiveness of the proposed approach.

摘要： The problem of data packet dropouts induced by rncommunication channel in networked control systems rn(NCS) was studied.rnNCS with packet dropouts was modeled as Markov jump rnlinear system (MJLS) and the H∞ control techniques rnof NCS were rnestablished based upon the bounded real lemma of rnMJLS. The state feedback controller was computed by a rnnecessary and sufficient rnlinear matrix inequality condition. Using the rnsoftware NS2 to simulate real network performance, we rndesigned and implemented a rnnew real-time simulation platform for NCS. An rnexperiment was carried out on the platform and the rnsimulations have demonstrated rnthe effectiveness of the proposed approach.

摘要： The problem of data packet dropouts induced by rncommunication channel in networked control systems rn(NCS) was studied.rnNCS with packet dropouts was modeled as Markov jump rnlinear system (MJLS) and the H∞ control techniques rnof NCS were rnestablished based upon the bounded real lemma of rnMJLS. The state feedback controller was computed by a rnnecessary and sufficient rnlinear matrix inequality condition. Using the rnsoftware NS2 to simulate real network performance, we rndesigned and implemented a rnnew real-time simulation platform for NCS. An rnexperiment was carried out on the platform and the rnsimulations have demonstrated rnthe effectiveness of the proposed approach.

摘要： 煤矿井下的特殊性，制约了矿井通信系统的发展。分布式天线系统(DAS)以其能够增加通信服务距离、提高资源利用率、改善无线覆盖的可靠性和高效性等特点得到越来越多的关注。本文将DAS应用到煤矿井下，构建了适用于煤矿井下的系统结构。为了研究天线节点与汇聚节点之间距离的问题，利用NS-2工具针对不同的距离进行模拟仿真，结果为：在长1000m的巷道内，将基站放在中间的位置，相邻的天线距离为170～180m时，从系统的平均端到端时延、丢包率和吞吐量三方面综合考虑，系统的性能相对较好。

摘要： 煤矿井下的特殊性，制约了矿井通信系统的发展。分布式天线系统(DAS)以其能够增加通信服务距离、提高资源利用率、改善无线覆盖的可靠性和高效性等特点得到越来越多的关注。本文将DAS应用到煤矿井下，构建了适用于煤矿井下的系统结构。为了研究天线节点与汇聚节点之间距离的问题，利用NS-2工具针对不同的距离进行模拟仿真，结果为：在长1000m的巷道内，将基站放在中间的位置，相邻的天线距离为170～180m时，从系统的平均端到端时延、丢包率和吞吐量三方面综合考虑，系统的性能相对较好。

摘要： 煤矿井下的特殊性，制约了矿井通信系统的发展。分布式天线系统(DAS)以其能够增加通信服务距离、提高资源利用率、改善无线覆盖的可靠性和高效性等特点得到越来越多的关注。本文将DAS应用到煤矿井下，构建了适用于煤矿井下的系统结构。为了研究天线节点与汇聚节点之间距离的问题，利用NS-2工具针对不同的距离进行模拟仿真，结果为：在长1000m的巷道内，将基站放在中间的位置，相邻的天线距离为170～180m时，从系统的平均端到端时延、丢包率和吞吐量三方面综合考虑，系统的性能相对较好。

摘要： 本文基于形式化建模的思想，分别建立源节点、中间节点和目的节点的有限状态机(FSM)模型，描述AODV协议的路由行为及算法思想，分析影响AODV协议性能的可能性因素后，利用NS2对AODV协议进行仿真，以指导对协议算法的改进及其下一步研究方向，使其更好地适应Ad hoc网络特点。

摘要： 本文基于形式化建模的思想，分别建立源节点、中间节点和目的节点的有限状态机(FSM)模型，描述AODV协议的路由行为及算法思想，分析影响AODV协议性能的可能性因素后，利用NS2对AODV协议进行仿真，以指导对协议算法的改进及其下一步研究方向，使其更好地适应Ad hoc网络特点。

摘要： 本发明披露了式I化合物，包括它们的盐，以及组合物和使用所述化合物的方法。所述化合物具有抗丙型肝炎病毒(HCV)的活性，并且可用于治疗感染有HCV的那些患者。

摘要： 本发明涉及一种肽组合物，其含有丙型肝炎病毒的多蛋白NS3/NS4和丙型肝炎病毒的多肽NS5b。本发明还涉及插入了编码多蛋白NS3/NS4和多肽NS5b的核酸序列的表达载体如腺病毒和痘病毒。本发明的组合物可用于治疗用途。

摘要： 本发明公开了一种抑制噪声整形(Noise‑Shaping，NS)逐次逼近寄存器型(Successive Approximation Register，SAR)模数转换器(Analogue‑to‑Digital Converters，ADC)中电容式数模转换器(Capacitive Digital‑to‑Analogue Converter，CDAC)失配误差的二阶整形技术。通过将前两个周期产生的失配误差反馈到当前周期，二阶失配误差整形得以实现。此外，在模拟域中，通过反转最高有效位CDAC来消除最低有效位CDAC反馈的值，从而消除动态范围的损耗。该技术可以直接嵌入到SAR ADC的工作环路中，仅需增加一个比较器的输入对和一个误差采样电容。仿真结果表明，采用该整形技术后，10‑bit NS SAR ADC的信噪失真比(signal to noise and distortion ratio，SNDR)由75.7提高到84.8dB，无杂散动态范围(spurious‑free dynamic range，SFDR)由78.2提高到107.3dB。

摘要： 本发明属于半导体技术领域，具体为一种基于二维材料的NS叠层晶体管及其制备方法。本发明的NS叠层晶体管由两层或数层二维材料的活性层，三层或数层石墨烯或者金属的栅极堆叠共栅组成。本发明的制备方法包括硅/二氧化硅埋栅的制备；硅/二氧化硅衬底上的二维材料的制备；与二维材料不连接的石墨烯或金属电极的制备；二维材料的氧化或者选择性刻蚀和金属电极的选择性刻蚀；与二维材料边缘接触的金属电极以及和金属电极接触的连接电极的制备。本发明提出一种二维材料的新型晶体管结构，不仅解决了硅基晶体管在极小尺度下的短沟道效应问题，而且此类型晶体管可适应5nm以下先进制程工艺，为二维材料在集成电路先进工艺中的应用提供了基础。

摘要： 本发明披露了式I化合物，包括它们的盐，以及组合物和使用所述化合物的方法。所述化合物具有抗丙型肝炎病毒(HCV)的活性，并且可用于治疗感染有HCV的那些患者。

摘要： 提供了通过施用NS5A抑制剂、NS5B抑制剂、NS3抑制剂或其组合而治疗乙型肝炎病毒感染的方法。

摘要： 本发明公开了一种包含滨麦3Ns，6Ns和7Ns染色体的小麦-滨麦多重异代换系的培育方法，包括下述步骤：1)四倍体硬粒小麦与八倍体小滨麦杂交，在F1，F2，F3和F4世代均进行鉴定，筛选出染色体数目为2n=42，且含有滨麦Ns基因组染色体的单株；2)筛选出的单株均套袋自交，在F5世代，选育出含有6条滨麦Ns基因组染色体(3Ns，6Ns和7Ns)的小麦-滨麦多重异代换系。本发明公开了上述小麦-滨麦多重异代换系的鉴定方法。本发明公开的小麦-滨麦多重异代换系在株高、穗长、分蘖数等农艺性状方面得到了明显的改善。

摘要： 一种包含滨麦1Ns、5Ns和6Ns染色体的小麦-滨麦多重异代换系的创制：通过利用八倍体小滨麦M842-12(2n＝8x＝56，AABBDDNsNs)与硬粒小麦(2n＝4x＝28，AABB)品种Trs-372杂交，在F1，F2，F3和F4世代均进行细胞学染色体镜检和基因组原位杂交(GISH)鉴定，筛选染色体数目为2n＝42，且含有滨麦Ns基因组染色体的单株，对筛选出的单株均套袋自交，在F5世代，选育出1个含有滨麦1Ns、5Ns和6Ns染色体的小麦-滨麦多重异代换系05DM6。

摘要： 本发明涉及一种肽组合物，其含有丙型肝炎病毒的多蛋白NS3/NS4和丙型肝炎病毒的多肽NS5b。本发明还涉及插入了编码多蛋白NS3/NS4和多肽NS5b的核酸序列的表达载体如腺病毒和痘病毒。本发明的组合物可用于治疗用途。

摘要： 本发明属于半导体技术领域，具体为一种基于二维材料的NS叠层晶体管及其制备方法。本发明的NS叠层晶体管由两层或数层二维材料的活性层，三层或数层石墨烯或者金属的栅极堆叠共栅组成。本发明的制备方法包括硅/二氧化硅埋栅的制备；硅/二氧化硅衬底上的二维材料的制备；与二维材料不连接的石墨烯或金属电极的制备；二维材料的氧化或者选择性刻蚀和金属电极的选择性刻蚀；与二维材料边缘接触的金属电极以及和金属电极接触的连接电极的制备。本发明提出一种二维材料的新型晶体管结构，不仅解决了硅基晶体管在极小尺度下的短沟道效应问题，而且此类型晶体管可适应5nm以下先进制程工艺，为二维材料在集成电路先进工艺中的应用提供了基础。