A New Security & Safety Management Mechanism of Active Node Resources

较传统网络而言,主动网络的高复杂性引起了更加严峻的资源安全问题,特别在主动节点方面。尽管在主动网络原型系统中设计了一些安全措施,但是它们都不具通用性。这在主动网络必须和传统网络相兼容的情况下,阻碍了主动网络的发展。文中设计了主动节点资源控制核,然后深入地研究了它与传统网络安全系统的接合问题,提出了对后者的具体修改建议。Active Networks are obviously more complex than traditional networks and raise considerable security & safety (in short, we call them S&S later) problems, especially in active node. Although some S&S technologies are designed in most active networks, all of them cannot be used as a universal way. On condition that active networks must be compatible with traditional IP networks, this situation results in baffling active networks development. Based on some concepts defined in this paper, such as negative error and positive error, this paper designs a resource controlling kernel for active node. In addition, this paper comprehensively studies the problem of tying this kernel in traditional network security system, and then, puts forth some suggestions of modifying traditional network security system in two aspects of security agent lay and security service lay in detail.“十五”国防基金项目 (41 0 0 1 0 1 0 1 0 6

Active queue management mechanism of active network

针对主动网络这种新型网络体系能为主动队列的管理提供更加灵活和有效的方法,以及目前主动网络中主动队列的管理仍然简单移用传统网络算法这一情况,深入研究了这种简单移用存在的弊端,及应专门为主动网络设计主动队列管理机制的重要性和必要性。在此基础上,利用主动网络中路由器有着对流经其上的用户数据进行计算的特征,提出了主动网络环境下,基于资源动态协商的主动队列管理机制,并用OPNET8.0进行了仿真实验,验证了该机制在丢包率、队列长度和包延时等方面的优势。Active network represents a new approach of network architecture which can provide a more flexible and effective management mechanism for active queue. In view of this and considering that traditional algorithms of active queue management are still used in active network, the shortcoming of using traditional algorithms in active network, importance and necessity of setting up a special active queue management algorithm for active network are studied. Active network's routers can perform computations on user data, while packets can carry programs to be executed in routers and possibly change their state. With this characteristic, an active queue management mechanism, based on dynamic resource trading, is put forward A simulation that used to trove the advantages of the proposed mechanism in packet drop rate, length of queue and packet delay time is made under OPNET8.0 environment

The chemical constituents from fruits and seeds of Ligustrum lucidum Ait.

【英文摘要】 The chemical constituents from fruits and seeds of Ligustrum lucidum Ait. were determined. The content of fatty oil in the seeds reached 14.70%. The main constituents of fatty acid were: oleic acid (44.37%), linoleic acid (40.378%), linolenic acid (0.867%),palmitic acid (4.525%),stearic acid (1.843%) etc,and the contents of unsaturated fatty acid reached 88.184%, the seed oil was of higher nutrient value. The contents of amino acids and mineral elements were relatively abundant. The content of total sugar...福建省教育委员会基金资助项目 (K20096 );福建省自然科学基金资助项目 (No C9910001

汽车司机安全驾驶性向测验的建构

本研究之目的是建构适用于我国的汽车司机安全驾驶性向测验。经各种检验结果表明，无论是能力测验还是个性测验，它们在信度和效度上均达到了要求。因此，为进一步标准化奠定了基础。</p

The structure and function of male gonopod of Scylla serrata

【中文摘要】 于2000年6月至2002年10月,采用扫描电镜方法对锯缘青蟹(Scylla serrata)雄性附肢结构进行观察。结果表明,青蟹雄体输精管在第八胸节通向一个短的肌肉质的阴茎开口。第一腹肢由一个基部原肢和一个延长的内肢组成,表皮环包,形成一个交接管。第二腹肢吻合这个表皮管,而阴茎则放在内肢的基部侧面。交配时,阴茎在肌肉作用下,精液射到第一腹肢的射精管中,射出物在第二腹肢的活塞样的泵作用下,沿着管腔向里推进。第一腹肢顶端侧扁状、具侧缝,前部表面具棘突状和腺体孔,弯曲部棘较大。侧缝处具细长的棘和羽状刚毛,刚毛基部为杯状凹陷。 【英文摘要】 Structure and function of the gonopod in mud crab,Scylla serrata,were studied with electron microscope techniques from June 2000 to December 2002.The ejaculatory duct of Scylla serrata opens on the coxae or sternum of eighth segment by short muscular penis.The first gonopod consists of a basal protopodite and an elongated endopodite,in which the cuticle folded the entire length of a tube which functions as an ejaculatory canal.The second pleopod fits into this cuticular fold,while the penis fits into a slit...国家“八六三”重大专项基金(2002AA603013);国家自然科学基金(39870563

An evaluation of two semi-analytical ocean color algorithms for waters of the South China Sea

基于42组不同年份不同季节获得的遥感反射率、水体各组分吸收系数的实测数据,对QAA(QuASI-AnAlyTICAl AlgOrITHM)和gSM(gArVEr-SIEgEl-MArITOrEnA)算法在寡营养的南海和富营养的福建沿岸两种不同类型水体的吸收系数反演进行了检验。以水样测量值为参考,两种算法在本研究水体中的反演成效与他人在其它水域的研究结果相当。QAA算法在南海的反演成效高于福建沿岸水体。对于443nM的总吸收系数A(443),南海的对数均方根误差rMSE为0.044,平均相对误差ε为7.9%,对数平均偏差δ为0;福建沿岸水体rMSE=0.190,ε=30.6%,δ=-0.167。gSM算法在两类水体的反演成效类似,A(443)之rMSE和ε,南海分别为0.156和27.7%,福建沿岸分别为0.146和32.1%;但从A(443)的δ值看,其在南海反演值低于实测值(δ=-0.142),在福建沿岸则略呈高于实测值(δ=0.016)。两种算法中的部分经验参数与实测值之间的差异是产生反演误差的主要原因,为了提高反演精度,对算法中经验参数的更进一步区域化调整可能是必要的。With 42 in situ measurements of remote sensing reflectance and component absorption coefficients taken in the South China Sea and coastal waters off Fujian, China during different seasons, the authors evaluate the performance of the Quasi-Analytical Algorithm (QAA) and the Garver-Siegel-Maritorena (GSM) algorithm for water absorption coefficients.It is found that the retrieval performances of the two algorithms are similar to those of the algorithms by other researchers conducted in other regions.In this study , QAA performs better in the South China Sea than in the waters off coastal Fujian.For the total absorption coefficient at 443 nm a(443), the rootmean-square error (RMSE) is 0.046 in the South China Sea, with an averaged percentage error (ε) of 7.9% , and averaged error in log scale (δ) close to 0.For the waters off coastal Fujian, RMSE, ε and δ are 0.194, 30.6%, and -0.167, respectively.The performance of the GSM is similar for the two waters.For a(443), RMSE and ε are 0.161 and 27.7% in the South China Sea and 0.149 and 32.1% in the waters off coastal Fujian , respectively; their δ values, however, are negative (-0.142; indicating underestimation) in the South China Sea and positive (0.016; indicating slight overestimation)in the waters off coastal Fujian.Further analysis indicates that the differences between the empirical parameters employed in the algorithms and actual values of the studied waters are the main reasons causing the errors in remote sensing retrievals, therefore, it is necessary to regionally refine those parameters in order to improve the algorithm performance.863计划项目(2006AA09A302;2008AA09Z108);国家自然科学基金项目(40521003

塔里木沙漠公路防护林土壤微生物生物量与土壤环境因子的关系

为探讨极端干旱区风沙土土壤微生物与土壤环境因子的作用规律,采用相关分析法研究了塔里木沙漠公路防护林地土壤微生物生物量与理化因子和酶活性的关系.结果表明:土壤容重和粒径减小(R0.85)时,防护林地中土壤微生物数量和生物量有增大趋势,由容重与微生物量的相关性主导;土壤养分含量与土壤微生物数量和生物量呈正相关,主要由速效养分和放线菌、微生物生物量C、P的相关性所致;土壤酶活性与土壤微生物数量和生物量的相关性差异较大,R在0.51～0.91,主要取决于蔗糖酶、磷酸酶与放线菌、微生物量C的相关;土壤盐分增加不利于土壤微生物生物量的积累(R0.63).实践中应为干旱区林地土壤微生物营造良好的土体,促进土壤物质循环

STUDY ON THE ANTIFUNGAL ACTIVITIES OF ENDOPHYTIC FUNGI ISOLATED FROM SEVERAL PHARMACEUTICAL PLANTS

从三尖杉 ,南方红豆杉及香榧中分离出 1 72株内生真菌 ,对其进行抗菌活性检测 ,结果表明共 90株内生真菌对一种或多种植物病原真菌 ,如红色面孢霉 (Neurosporasp .) ,木霉 (Trichodermasp .) ,镰刀菌 (Fusariumsp .)等有抑制作用 ,来自三尖杉、南方红豆杉和香榧的抗菌活性菌株比例分别为 40 %,5 4 2 %及 5 7 1 %。其中平板抑菌圈直径大于1 5mm的高抗菌株有 3 5株。按Ainsworth等鉴定系统和方法进行鉴定 ,具有抗菌活性的内生真菌主要分布于拟青霉属、镰孢菌属等 1 8个属中。教育部高等学校博士学科点专项科研基金资助项目 (No .96 0 384 0 2

海洋浮游甲壳类分子系统学研究进展

回顾海洋浮游甲壳类系统学研究的基础上，综述了生化水平和 DNA (mtDNA 和核 DNA) 水平的分子系统学研究现状。分子标记中 DNA 序列分析最为常用，其次是 RFLP 和 RAPD 分析，mtDNA 主要应用于分类学、群体遗传学、种间分子进化和系统发育重建研究，而核 DNA 则应用于科以上较高阶元的系统发育和种内、近缘种间的遗传结构和遗传分化研究。最后对存在的问题和应用前景进行了展望。 【英文摘要】 Molecular systematics of marine planktonic crustaceans started in 1970s , and isozyme was the major method before the 1990s, its contents including genetic structure and genetic differentiation. Since the early 1990s, molecular markers (RAPD, RFLP especially DNA sequences) based on DNA and mtDNA have been widely used to study four parts of the systematics (classification, population genetics, phylogenetic reconstruction and molecular evolution) of marine planktonic crustaceans. The present situation and ap...国家重点基础研究发展规划项目（编号 G1999043708 号）资