加快寻优的医学图像互信息配准算法的研究

为了实现多模念医学图像的配准融合，提出一种加快寻优的医学图像互信息配准算法实现CT和MR图像的配准。该算法首先使用形态学方法提取图像的边界，再用力矩主轴法算出浮动图像进行刚性变换的初步平移量和旋转量，然后以此作为互信息法的初始参数进行寻优，找出最佳变换，实现CT和MR医学图像的自动刚性配准。该办法计算简单、运算量少。利用该配准算法实现融合的结果图像经过临床医生检验，认为达到临床诊断的要求，能辅助临床医生对疾病做出正确的诊断。     

一株来自深海沉积物的低温、嗜压菌的分离鉴定

从西太平洋5060m深的海底沉积物中分离到一组低温菌．对其中一株细菌WP02—2—25进行了生理生化和分子水平鉴定．结果表明：该菌革兰氏染色阴性；温度生长范围在28℃以下．最适生长温度15℃．pH耐受范围为4．5～9．5；最适pH值7．5．能够利用D-葡萄糖、甘油和麦芽糖作为唯一碳源生长并产酸．氧化酶和接触酶呈阳性．可以水解明胶和还原硝酸盐．但不能继续还原亚硝酸盐．产H2S气体．依据其生理生化性质、系统发育学、16SrDNA序列同源性分析初步鉴定该菌属于深海中特有的菌属：Morifella属．与嗜压菌Moritella ja ponica种有99．47％的同源性．生理生化指标表明．这两株菌不完全相同．Moritella．ja apoinca可以利用果糖、不能利用麦芽糖．而WP02—2—25正好相反．另外．两的最适生长温度也不一致．前属于嗜冷菌的范畴；后属于耐冷菌．     

高产旱稻新品种“GS郑旱2号”

该品种是常规粳型早稻新品种，已通过国家农作物品种审定委员会审定。该品种产量水平高，综合农艺性状优良，生育期120天，高91．6cm，穗长20cm，平均每穗总粒数86粒，千粒重30．4g，糙米率81．8％，整精米率62．8％．直链淀粉含量15％，胶稠度90mm，抗胡麻叶斑病，抗穗茎瘟病，适应性广，适于黄淮海地区(豫、鲁西南、秦岭以南，晋南，皖中北，苏北等地)的早稻区种植。     

《四川师范大学学报》（自然科学版）简介

《四川师范大学学报》（自然科学版）前身是1973年创刊的《四川师范学院学报》（文理合刊），1978年自然科学版创刊，1991年由季刊改为双月刊，国内外公开发行，国内统一刊号CN51—1295／N，国际标准连续刊号为ISSN1001—8395．本刊于1989年获四川省高校自然科学优秀学报二等奖，1990年获四川省优秀科技期刊三等奖，1992年获省高校优秀学报二等奖，1993年获四川省优秀期刊二等奖，     

Research on Fault Tolerant Scheduling Algorithms of Web Cluster Based on Probability

Aiming at the soft real time fault tolerant demand of critical web applications at present, such as E-commerce, a new fault tolerant scheduling algorithm based on probability is proposed. ““““““““Ib achieve fault tolerant scheduling, the primary/slave backup technology is applied on the basis of task‘s self similar accessing characteristics, when the primary task completed successfully, the resources allocated for the slave task are reclaimed, thus advancing system‘s efficiency. Experimental results demonstrate on the premise of satisfying system‘s certain fault tolerant probability, task‘s schedulabilistic probability is improved, especially, the higher task‘s self similar degree is, the more obviously the utilization of system resources is enhanced.     

An Intrusion Alarming System Based on Self-Similarity of Network Traffic

Intrusion detection system can make effective alarm for illegality of network users, which is absolutely necessarily and important to build security environment of communication base service. According to the principle that the number of network traffic can affect the degree of self-similar traffic, the paper investigates the variety of self-similarity resulted from unconventional network traffic. A network traffic model based on normal behaviors of user is proposed and the Hurst parameter of this model can be calculated. By comparing the Hurst parameter of normal traffic and the self-similar parameter, we can judge whether the network is normal or not and alarm in time.     

A New Proxy Signature Scheme with Message Recovery Using Self-Certified Public Key

A proxy signature scheme with message recovery using self-certified public key is proposed, which withstands public key substitution attacks, active attacks, and forgery attacks. The proposed scheme accomplishes the tasks of public key verification, proxy signature verification, and message recovery in a logically single step. In addition, the proposed scheme satisfies all properties of strong proxy signature and does not use secure channel in the communication between the original signer and the proxy signature signer.     

Hall Effect in Quasicrystals

The relations between Hall effect and symmetry are discussed for all 2- and 3-dimensional quasicrystals with crystallographical|y forbidden symmetries. The results show that the numbers of independent components of the Hall coefficient (R11) are one for 3-dimensional quasicrystals, two for those 2-dimensional quasicrystals whose symmetry group is non-Abelian, and three for those 2-dimensional quasicrystals whose symmetry group is Abelian. respectively. The quasicrysta[s with the same number of independent components have the same form of the components of R11.     

Some Results about the Sample Path Properties of Markov Processes with Independent Self-Similar Components

This paper considers a special class of operator self-similar processes Markov processes {X（t）, t≥0} with independent self-similar components, that is, X （ t ） =（X^1（t）,…,X^d（t））, where {X^i（t）,t≥0}, i=1,2,…,d are d independent real valued self-similar Markov processes. By means of Brel-Cantelli lemma, we give two results about asymptotic property as t→∞ of sample paths for two special classes of Markov processes with independent self-similar components.     

广义相对论中的异常零超曲面

本书给出了一个广义相对论中的广泛的和自含的脉冲类光信号的数学理论说明。这一理论将应用在相对论天体物理、宇宙学和来自引力交叉理论。激变天体物理事件提升到脉冲类光信号，并能分解为零物质薄壳和一个脉冲引力波，书中介绍了其在黑洞物理、波冲突和致密引力作用源中类光推进的一些例子。