关于循环等待协议提出的一种方法

在前期关于循环等待协议的研究基础上,对于在主从网络方式下,循环等待协议中,如何建立等待环以及计算机站点如何进、出等待环的问题进行了讨论,并提出了一种较理想的解决方法。并且把这种方法和作者在另一篇文章中所提出的基于平等站方式下的解决办法进行了比较,对它们的优缺点进行了详细的讨论。     

计算机局部网际网的路由协议

本文研讨了局部网际网的路由协议,文中以采用桥互连的Apple Talk局部网际网为实例,讨论了数据报传输协议(DDP)的路由算法,以及路由表维护协议(RTMP)。     

BINDING NUMBER AND MINIMUM DEGREE FOR [a,b]-FACTORS

We give some sufficient conditions on the binding number and the minimumdegree for a graph to have an [a, b]-factor.     

REMARKS ON THE BINDING NUMBER FOR [a,b]-FACTORS

We give some answers to the following question:If the binding numberof a graph G is more than 1+(a-1)/b,does G have an [a,b] -factor?     

计算机时钟同步技术研究

首先介绍了和分析了计算机时钟同步系统的主要理论与技术，研究了同步系统的三个主要组成部分，然后研究了应用最为广泛的绝对物理时钟同步系统的设计方法，对其两种核心算法：CRI算法和PCS算法进行了详细的分析及性能比较，作为上述时钟同步理论的一个应用例子，本文最后简要介绍了基于网络时间协议（NTP）的同步技术及其软件实现。     

Genetic and environmental influences on behavioral and neurochemical aspects of emotionality in rats

Summary Three pairings of rats (two derived from divergent, selective breeding and one from divergent environmental conditions) were compared with regard to behavioral and hormonal parameters. Striking differences were observed: results obtained in our own laboratory as well as those found in a review of the literature pointed to higher emotionality (e.g., increased defecation and corticosterone secretion, etc.) in Roman low-avoidance, Wistar-Kyoto and group-housed rats, as compared to their respective counterparts, Roman high-avoidance, spontaneously hypertensive, and individually housed Wistar rats. Concomitant receptor binding studies reviewed here (³H-diazepam- and³H-imipramine-binding sites) have revelaed, however, less consistent intrapair differences.     

The effect of mouse erythrocyte rosette forming lymphocytes on lymphokine production in T-cell cultures

Summary An enhancement effect of mouse erythrocyte rosette forming (MERF) cells on the production of migration inhibitory factor, chemotactic factor for neutrophils and skin reactive factor in T-lymphocyte cultures stimulated with the purified protein derivative of tuberculin was observed. We consider it likely that the MERF cells, possessing the appropriate cell surface constituents to construct an immunogenic moiety, present antigen on their surfaces to elicit lymphokine production.This work was supported by the Scientific Research Council, Ministry of Health, Hungary, Code No. 421030401 1/s     

Nucleotide binding domains of human CFTR: a structural classification of critical residues and disease-causing mutations.

Defective function of the cystic fibrosis (CF) transmembrane conductance regulator (CFTR) causes CF, the most frequent lethal inherited disease among the Caucasian population. The structure of this chloride ion channel includes two nucleotide-binding domains (NBDs), whose ATPase activity controls channel gating. Recently, the experimental structures of mouse and human CFTR NBD1 and our model of the human CFTR NBD1/NBD2 heterodimer have provided new insights into specific structural features of the CFTR NBD dimer. In the present work, we provide a structural classification of CF-causing mutations which may complement the existing functional classification. Our analysis also identified amino acid residues which may play a critical role in interdomain interaction and are located at the NBD1-NBD2 interface or on the surface of the dimer. In particular, a cluster of aromatic amino acids, which includes F508 and straddles the two NBDs, might be directly involved in the interaction of the NBD1/NBD2 heterodimer with the channel-forming membrane-spanning domains.Received 24 May 2005; received after revision 13 June 2005; accepted 18 June 2005     

基于虚拟路由器方式的VPN组播实现机制

论文对三层VPN组播进行了研究,提出了一种基于VR方式的VPN组播实现机制,并依照本地VPN站点及服务提供商骨干网络的建树、组播分组的封装处理流程,阐述了方案的具体实现.验证结果证明本文所提出的方法最大限度的减少了骨干网络路由器上的组播状态,从而提高网络可扩展性.     

两段提交协议的Petri网模型

为两段提交协议构造了Petri网模型,并在此模型的基础上运用Petri网理论的方法对两段提交协议进行了分析.为进一步研究和改进两段提交协议提供了一种新的思路.