校园网中IP地址的盗用和防范

防范校园网中IP地址盗用，应从分析TCP／IP协议出发，对于IP盗用的常用手，可通过VLAN划分、静态ARP地址表绑定和交换机端口-MAC地址绑定等方法解决。     

石家庄宽带IP城域网的建设

结合铁通石家庄分公司宽带城域网的建设，阐述了宽带IP城域网的建设原则、组网方式、业务实现方式、网络安全保证措施等。     

PLC及IP_3R拮抗剂对弥漫性轴索损伤后继发性脑损伤的治疗作用

目的研究弥漫性轴索损伤(diffuse axonal injury,DAI)后PLC及IP3R抑制剂对DAI引发的脑水肿及神经元变性、损伤程度的影响,阐明PLC及IP3R抑制剂对DAI后继发性损伤的治疗作用。方法采用头颅冠状面瞬间加速旋转装置,制作大鼠颅脑DAI模型,并使用侧脑室穿刺给药的方法注射PLC抑制剂U73122及IP3R抑制剂光溜海绵素C(Xestospongin,XeC)。采用干湿重法测量脑组织含水量,ELISA测量脑脊液及动脉血中血清白蛋白(Alb)浓度并计算比值(QAlb),免疫组化法测量β-淀粉样前体蛋白(β-APP)的阳性面积及Western blot方法测量PLC的磷酸化程度。结果 DAI后6h大鼠脑组织含水量已明显增加,24h到达顶点,之后逐步下降,在5d时恢复到损伤前水平,XeC及U73122干预明显降低了损伤后24h脑组织含水量。ELISA结果显示DAI后6h及24h脑脊液中Alb浓度及QAlb明显升高,之后下降至损伤前水平,XeC及U73122干预对DAI引起的脑脊液中Alb浓度及QAlb升高无明显影响。免疫组化结果显示DAI后24h的β-APP的阳性面积较损伤前明显升高,XeC及U73122干预显著降低了DAI后24h的β-APP阳性面积。结论 DAI后脑水肿的形成是由细胞毒性水肿及血管源性水肿共同构成的;PLC及IP3R抑制剂降低了DAI后的细胞毒性水肿及神经元变性、损伤程度,对DAI后的继发性脑损伤具有治疗作用。     

A new data acquisition and processing system for profiling sonar

A multi-beam chirp sonar based on IP connections and DSP processing nodes was proposed and designed to provide an expandable system with high-speed processing and mass-storage of real-time signals for multi-beam profiling sonar. The system was designed for seabed petroleum pipeline detection and orientation, and can receive echo signals and process the data in real time, refreshing the display 10 times per second. Every node of the chirp sonar connects with data processing nodes through TCP/IP. Merely by adding nodes, the system＇s processing ability can be increased proportionately without changing the software. System debugging and experimental testing proved the system to be practical and stable. This design provides a new method for high speed active sonar.     

高速公路IP语音调度系统的设计与实现

介绍针对高速公路调度指挥设计的IP语音调度系统，通过IP语音技术解决高速公路调度指挥中通信方面存在的问题。论述系统的设计与结构，并对主要功能的实现原理和实现方法进行了介绍。