可靠组播中基于FEC的随机化差错恢复算法*

提出RRMF算法,用向前纠错和重传技术相结合的方式为网络提供可靠组播.FEC通过增加冗余信息的方式提高可靠性.当接收到的信息不足以恢复原始数据时,使用ARQ进行差错恢复.减少了重传发生的次数,从而降低了差错反馈信息和重传数据占用的带宽,适合在大规模交互中使用.     

光突发交换网络中面向低时延高可靠业务的突发编码机制

为了保证光突发交换(OBS)网络中业务高可靠性的同时,降低突发的端到端的时延,提出了一种基于不规则重复积累(IRA)码的突发编码机制. 对IRA码校验矩阵结构进行了一定的调整,得到一种能对突发进行在线编解码的在线不规则重复累积(OL-IRA)码. 利用OL-IRA码对信息突发进行编码,以便用产生的冗余突发来恢复丢失的信息突发. 仿真结果表明,OL-IRA码在保证恢复丢包能力的同时,也能明显缩短丢包恢复的时延.     

基于码率兼容LDPC码的多中继协作自适应传输

为适应动态信道条件,提高传输可靠性,基于增量冗余混合自动重传请求和码率兼容低密度奇偶校验码（RC-LDPC）,研究了多中继选择的速率自适应中继协作传输体制.针对中继节点的随机分布和特定分布,提出2种不同的中继选择协作方案,并给出了系统中断概率和吞吐量性能的表达式.数值分析和仿真结果表明,在中继节点的特定分布下引入中继之间的相互协作,可同时显著提高系统的中断概率和吞吐量性能.     

The impact of extended-hours home hemodialysis and buttonhole cannulation technique on hospitalization rates for septic events related to dialysis access

Few studies adequately document adverse events in patients receiving long, slow, and overnight hemodialysis (NHD). Concerns about high rates of dialysis access complications have been raised. This is an observational cohort study comparing hospital admission rates for vascular access complications between alternate nightly NHD (n=63) and conventional hemodialysis (n=172) patients established on chronic hemodialysis for at least 3 months. Overall, hospital admission rates and hospital admission rates for cardiac and all infective events are also reported. The NHD cohort was younger and less likely to be female, diabetic, or have ischemic heart disease than the conventional hemodialysis cohort. When NHD and buttonhole cannulation technique were used simultaneously, there was a demonstrated increased risk of septic dialysis access events: incidence rate ratio 3.0 (95% confidence interval 1.04-8.66) (P=0.04). The majority of blood culture isolates in NHD patients were gram-positive organisms, particularly Staphylococcus aureus. Alternate nightly NHD did not significantly change total hospital admissions or hospital admissions for indications other than dialysis access complications, compared with conventional hemodialysis. Our data suggest that buttonhole cannulation technique should be used with caution in patients performing extended-hours hemodialysis as this combination appears to increase the risk of septic access complications. Randomized-controlled trials are needed to confirm these findings.     

IRA码在远程光纤通信系统中的应用

前向纠错码 (FEC)是光纤通信系统提高系统容量的一项关键技术。在远程光纤信道中 ,放大器自发辐射 (ASE)噪声是主要噪声源。FEC在光纤通信系统应用时 ,通常用高斯分布估计ASE噪声。本文提出用x平方律分布模型代替高斯信道模型 ,并将高性能的不规则重复累积 (IRA)码应用于远程光纤通信系统。仿真结果表明 :IRA码的性能优于RS码、Turbo码等 ,而且x平方律信道的性能优于高斯信道。     

Predicting hospitalization of psychiatric outpatients.

"This study constitutes an attempt to devise simple, widely applicable, and maximally precise indices to aid in predicting hospitalization of psychiatric outpatients, as well as to formulate a partial operational definition of the concept, 'latent psychiatric illness'… . Three forms of index were derived, one consisting only of nonpsychometric variables, one consisting only of MMPI signs, and one comprising both nontest and MMPI factors." 24 references. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Social competence and outcome in psychiatric disorder.

Relationship of premorbid social competence of patients necessitating hospitalization to length of hospitalization, frequency of hospitalization, and time between hospitalizations was studied. Case histories of 251 patients were analyzed. As with previous studies, a positive relationship between the variables was found. Those at the lower end of the social competence continuum had longer periods of hospitalization and greater likelihood of rehospitalization. Social competence was therefore seen to be related to prognosis. Results were discussed in terms of developmental approach to personality and, in particular, psychopathology. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Role of maternal psychopathology in male and female schizophrenics.

Selecting from records of a child guidance clinic, the psychopathology of 165 mothers of male and female children and adolescents was studied in order to investigate sex differences in the degree of relationship between mother's mental status and the child's later hospitalization for schizophrenia. Of the children, 108 were later hospitalized for schizophrenia, while 57 achieved an adequate adjustment in areas of work and interpersonal relationships. For the girls, those who became schizophrenic had severely disturbed mothers significantly more often than did those who achieved an adequate adjustment (p     

Vocabulary knowledge and usage of schizophrenic subjects: A six-year follow-up.

(see 29: 2813) The assumption that length of institutionalization affects vocabulary, qualitatively or quantitatively, was investigated by the retesting of hospitalized chronic paranoid schizophrenics. "Overall performance was remarkably stable over the six year period." Subtle changes in some aspects of verbalization were noted, particularly re definitions; but this was related to changes due to age rather than schizophrenia. (PsycINFO Database Record (c) 2010 APA, all rights reserved)