虚拟iSCSI存储通道的设计与实现

提出一种利用现有SCSI存储系统、实现虚拟iSCSI存储通道的构想，并且给出其设计与实现的方法．列举此系统和物理SCSI通道系统的文件传输速率测试对比数据，并做了简要的分析．结果表明虚拟iSCSI存储通道的构想是可行的，对于中小企业实现廉价的高性能网络存储系统具有实际价值．     

用于远程教学的iSCSI协议实现

iSCSI协议作为存储系统的一种解决方案在远程教学中得到日渐广泛的应用.为了优化iSCSI协议的表现、提高远程教学质量,通过一个开放源码的iSCSI协议的软件实现,对可能影响iSCSI协议表现的因素进行了测试分析.测试主要从iSCSI系统(启动端、目标端)硬件选择、iSCSI系统参数设置两个方面展开.测试结果表明 提高I/O操作的效率,注意数据可用性、完整性和速度的平衡,以及优化硬件条件是优化iSCSI协议表现的关键.     

iSCSI协议软件实现方式的研究与设计

iSCSI是一种基于TCP/IP的新型网络存储协议,用于实现高效、廉价可靠的存储区域网络。在使用iSCSI协议实现IP-SAN的过程中,启动器(Initiator)的实现方式和过程是至关重要的。本文研究了iSCSI协议中Initiator的三种实现方式,从不同角度进行对比,重点对以纯软件方式实现iSCSI协议进行了详细的研究,分析了iSCSI Initiator在操作系统中的层次框架并简述了实现方案。     

异构环境下的iSCSI协议分析与实现

iSCSI协议可以有效解决SAN中数据在IP网络上的传输和共享问题,在对iSCSI协议进行了详细的分析的基础上,给出了在异构环境下利用该协议实现异地数据访问的实现方法.     

Linux下的iSCSI协议安全性的分析

从认证和数据加密两个角度研究了iSCSI的安全性,分析了SSH安全机制对iSCSI存储系统的性能影响,并对Rsync算法进行改进,在此基础上提供了IP层和上层协议的iSCSI安全;使用IOmeter进行性能测试,并对iSCSI在2种安全机制下的性能测试结果进行分析.     

基于iSCSI的SAN存储加密系统研究

针对SAN中静态数据的安全防护需求,提出并实现了基于iSCSI的SAN存储加密系统。该系统利用iSCSI协议栈和虚拟化技术实现SAN磁盘静态数据的后端加密,提供多密钥多层次加密体系,能适应复杂的安全管理策略要求。另外,通过RC缓存聚合数据包,优化了iSCSI性能。仿真实验表明,该系统具有良好的性能。     

iSCSI协议安全性的分析

从iSCSI协议的安全性出发,从认证和数据加密2个角度研究了iSCSI的安全性,SSH有很多功能,它传送的是经过压缩的加密信息,目的是要在非安全网络上提供安全的远程登录和其他安全网络服务,使用它既可以代替Telnet,又可以为FTP、邮件传输、甚至为PPP提供一个安全的"通道"。IPSEC位于IP层,为2台机器之间提供安全的IP连接。它能保护运行于IP层之上的任何一种协议。而SSH是位于应用层与传输层之间的一种安全协议,因此它能够紧紧和iSCSI融合在一起,保障iSCSI的安全。提出了基于SSH的安全iSCSI方案,所以实验选择SSH作为iSCSI的安全机制,其中SSH的安全通过OpenSSH-4.3p2-10来实现,在此基础上提供了IP层和上层协议的iSCSI安全。     

TD-SCDMA系统终端中的媒体接入控制

媒体接入控制层位于数据链路层的最底层，在实现高速移动通信中起着十分重要的作用。简要介绍了媒体接入控制过程后，提出了在TD-SCDMA系统中实现对资源单元进行管理和配置的新方案，并给出了实现该方案的主要流程图，此方案将在TD-SCDMA系统终端中能较好地实现对资源单元的管理和配置。     

基于Linux的多媒体教学系统的设计与实现

本文首先设计了Linux下多媒体教学系统的解决方案，并从网络流量和服务器性能的影响两个方面分析了该方案的性能，然后设计了整个软件系统的软件模块．在此基础上．给出了多媒体教学系统应用软件各主要功能模块的实现，     

邮件系统在GPRS网中的实现

介绍了GPRS网的特点及应用于工业控制中的存在的问题，给出了解决问题的一种具体方法，然后分析了SMTP、POP3在GPRS工业系统中的应用结构及实现方案，在此基础上实现动态IP地址MS之间的端对端的连接．     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Characterization of Ordovician carbonate reservoirs, southeastern Saskatchewan, Canada

The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3～4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰～ -7.8‰, PDB) and matrix dolomites (-6.6‰～ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084～0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078～0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

A computer generator for randomly layered structures

AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

海南岛地体及其毗邻陆缘晚中生代—新生代古地磁研究和构造演化

本文叙述了对海南岛及其毗邻大陆边缘白垩纪到第四纪地层岩石进行古地磁研究的全部工作过程。通过分析岩石中剩余磁矢量的磁偏角及磁倾角的变化,提出海南岛白垩纪以来经历的构造演化模式如下:早期伴随顺时针旋转而向南迁移,后期伴随逆时针转动并向北运移。联系该地区及邻区的地质、地球物理资料,对海南岛上述的构造地体运动提出以下认识:北部湾内早期有一拉张作用,主要是该作用使湾内地壳显著伸长减薄,形成北部湾盆地。从而导致了海南岛的早期构造运动,而海南岛后期的构造运动则主要是受南海海底扩张的影响。海南地体运动规律的阐明对于了解北部湾油气盆地的形成演化有重要的理论和实际意义。     

An Index mechanism for multi-scale view in spatial databases

There are numerous geometric objects stored in the spatial databases. An importance function in a spatial database is that users can browse the geometric objects as a map efficiently. Thus the spatial database should display the geometric objects users concern about swiftly onto the display window. This process includes two operations:retrieve data from database and then draw them onto screen. Accordingly, to improve the efficiency, we should try to reduce time of both retrieving object and displaying them. The former can be achieved with the aid of spatial index such as R-tree, the latter require to simplify the objects. Simplification means that objects are shown with sufficient but not with unnecessary detail which depend on the scale of browse. So the major problem is how to retrieve data at different detail level efficiently. This paper introduces the implementation of a multi-scale index in the spatial database SISP (Spatial Information Shared Platform) which is generalized from R-tree. The difference between the generalization and the R-tree lies on two facets: One is that every node and geometric object in the generalization is assigned with a importance value which denote the importance of them, and every vertex in the objects are assigned with a importance value,too. The importance value can be use to decide which data should be retrieve from disk in a query. The other difference is that geometric objects in the generalization are divided into one or more sub-blocks, and vertexes are total ordered by their importance value. With the help of the generalized R-tree, one can easily retrieve data at different detail levels.Some experiments are performed on real-life data to evaluate the performance of solutions that separately use normal spatial index and multi-scale spatial index. The results show that the solution using multi-scale index in SISP is satisfying.     

《Chinese Science Bulletin》SUBJECT INDEX TO VOLUME 59(2014)

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Achieving Unusual States of Matter Under High Pressure

The elongation method,originally proposed by Imamura was further developed for many years in our group.As a method towards O(N)with high efficiency and high accuracy for any dimensional systems.This treatment designed for one-dimensional(ID)polymers is now available for three-dimensional(3D)systems,but geometry optimization is now possible only for 1D-systems.As an approach toward post-Hartree-Fock,it was also extended to