Design and Implementation of Campus Network Security Model based on NS2

近年来，我国校园网络在科学研究中的重要性不断增加，校园网的功能已经覆盖到对高校的管理，教学，和许多其他的任务。同时，随着校园网复杂性的提升，校园网的攻击防护以及安全保证等工作，已经逐渐成为了一个系统工程，需要从全方位进行建设和维护。因此，校园网络安全系统的构建逐渐成为了学术界工业界是一个重点探讨的问题。 校园网作为一个面向学生和老师的开放系统，近年来网络上运载的各种数据成爆发式增长，同时，也面临着各式各样已存在的和潜在的威胁和攻击。校园网安全状况直接关系到我国高校师生生活和工作，直接影响着我国高校的教学科研工作的正常开展。 VPN是一种组网技术(即在公网中建立虚拟专网)，拓展了各类应用在网...In recent years, the importance of the campus network in scientific research in our country continue to increase. The function of the campus network has already covered the management of colleges and universities, teaching, and many other tasks. At the same time, along with the campus network, the complexity of campus network attack protection and security work, has become an engineering task, whi...学位：工程硕士院系专业：信息科学与技术学院_计算机技术学号：X200922103

SD大鼠喉移植自然免疫排斥的病理学观察

【目的】对SD大鼠喉移植的自然免疫排斥过程进行病理学观察，定义移植喉急性免疫排斥反应的病理评价标准。【方法】实验采用作者已建立的改良模型进行鼠喉移植。实验组12例，受体和供体均为封闭群Ⅱ级雄性SD大鼠，移植术后第1，3，5，7，14，21天（各2例）解剖移植喉，常规病理观察移植喉的组织结构变化；对照组12例，受体和供体均为F344近交系大鼠，方法同实验组。【结果】实验组术后第1天移植喉表现为周围组织，黏膜固有层水肿；术后第3天时固有层增厚，炎症细胞浸润．小涎腺腺泡结构部分破坏，扭曲；呼吸道上皮部分坏死脱落，白细胞浸润．气管腔有浆液渗出；术后第5天小涎腺严重破坏、萎缩，气管上皮呈大部分坏死脱落。肌肉和甲状腺开始坏死、萎缩、炎症细胞浸润；术后第7天则软骨膜开始破坏，软骨周围有大量炎症细胞浸润，甲状腺、小涎腺、肌肉大量破坏，仅剩少量变性组织残留。术后第14天移植喉正常结构消失，大量炎症细胞浸润，软骨结构仅剩部分：术后第21天移植喉完全被疤痕组织替代。对照组术后第1、3、5天变化与实验组相近稍轻，术后第14天、第21天移植喉外周纤维包裹形成，喉结构存在，气管黏膜鳞状化，涎腺、甲状腺、肌肉部分萎缩，甲状软骨结构基本正常。【结论】同种异体SD大鼠异位喉移植的免疫排斥过程呈渐进性过程。黏膜上皮、涎腺、甲状腺、肌肉、软骨被机体免疫排斥破坏时间不一，黏膜上皮最早，软骨最迟。喉移植免疫排斥的时序性与免疫排斥程度分级相关

大鼠供体喉保存的研究

【目的】研究大鼠喉移植供体喉的保存，探讨喉体不同组织结构对缺血和坏死的耐受情况。【方法】40只Wister大鼠，采用UW液灌注，低温保存供体鼠喉，分别通过病理光学及透射电镜观察其形态学改变，比较喉不同组织结构的缺血、坏死变化。【结果】供体喉保存60h后，病理HE染色才能镜检到喉体组织缺血改变，电镜24h即可发现组织细胞的缺血改变，鼠喉各组织结构缺血耐受时间不同，最先出现变化的是粘膜上皮，接着是喉内肌、小涎腺、血管内皮、神经纤维，最后改变的是软骨细胞。【结论】透射电镜检查能及时地反映喉体组织细胞缺血、坏死情况，UW氏液保存供体喉不宜超过26h

JUNO Sensitivity on Proton Decay p→νˉK+p\to \bar\nu K^+ Searches

The Jiangmen Underground Neutrino Observatory (JUNO) is a large liquid scintillator detector designed to explore many topics in fundamental physics. In this paper, the potential on searching for proton decay in $p\to \bar\nu K^+$ mode with JUNO is investigated.The kaon and its decay particles feature a clear three-fold coincidence signature that results in a high efficiency for identification. Moreover, the excellent energy resolution of JUNO permits to suppress the sizable background caused by other delayed signals. Based on these advantages, the detection efficiency for the proton decay via $p\to \bar\nu K^+$ is 36.9% with a background level of 0.2 events after 10 years of data taking. The estimated sensitivity based on 200 kton-years exposure is $9.6 \times 10^{33}$ years, competitive with the current best limits on the proton lifetime in this channel

JUNO sensitivity on proton decay p → ν K + searches*

The Jiangmen Underground Neutrino Observatory (JUNO) is a large liquid scintillator detector designed to explore many topics in fundamental physics. In this study, the potential of searching for proton decay in the $p\to \bar{\nu} K^+$ mode with JUNO is investigated. The kaon and its decay particles feature a clear three-fold coincidence signature that results in a high efficiency for identification. Moreover, the excellent energy resolution of JUNO permits suppression of the sizable background caused by other delayed signals. Based on these advantages, the detection efficiency for the proton decay via $p\to \bar{\nu} K^+$ is 36.9% ± 4.9% with a background level of $0.2\pm 0.05({\rm syst})\pm$$0.2({\rm stat})$ events after 10 years of data collection. The estimated sensitivity based on 200 kton-years of exposure is $9.6 \times 10^{33}$ years, which is competitive with the current best limits on the proton lifetime in this channel and complements the use of different detection technologies