Some improvements are made to enhance the generic algorithm ' s stability self adaptability and optimization efficiency . based on the ttg model , the co - synthesis method can map parallel task graphs to multiple processing unlts 本文提出了基于改进遗传算法解决软硬件协同综合问题的新方法，基于ttg模型，该方法能够实现多并发任务流在多处理单元结构上的映射。
Aiming at the computation intensive embedded systems with fixed periodical constraint , the thesis presents a timed task graph ( ttg ) model , which making a good lbundation of hardware / software co - synthesis and performance evaluation 针对有固定周期约束的计算密集型嵌入式系统，本文提出了带时间约束的任务流图模型( ttg ) ，为软硬件协同综合综合和评价研究奠定了良好的基础。
Among the 17 isolates , 8 isolates display tcg - ttg mutation in codon 531 , 5 isolates have cac - tac or aac or cgc mutation in condon 526 , 3 isolates have gac - gtc mutation in codon 516 , and the last one has caa - aaa mutation in codon 513 其中8株为531位密码子tcg ttg的突变， 5株为526位密码子cac tac或aac或cgc的突变， 3株为516位密码子gac gtc的突变，另一株发生了513位密码子caa aaa的突变。
In ttg model , task is the base design granularity , the partition of task affect the quality of system design heavily . the thesis addresses the importance of the task partition problem and presents a task partition method based the closeness measurements of system behavior objec1fs Ttg模型中以任务作为设计的基本粒度，本文指出了任务划分问题的重要性，并提出了基于系统行为对象关系度量进行任务划分的方法。
Eight aspects related to the study of early precambrian metamorphic stratigraphy are dealt with in this paper : general situation of the study ; complexity of the stratigraphy and difficulties of the study ; thoughts and methods of the study ; division of rock suite , rock group and complex rock ; researches on important regional discordances ; types and characteristics of protolith and recovery of palaeoenvironment ; correct differentiation of the metamorphic strata , ttg rock system and other metamorphic plutonic rocks ; determination of the ages of the metamorphic strata 摘要主要论述了与早前寒武纪变质地层（学）有关的8个方面的问题：早前寒武纪变质地层的研究概况；早前寒武纪变质地层的复杂性和研究难度；早前寒武纪变质地层研究的思路和工作方法；早前寒武纪变质岩石地层单位岩群、岩组和杂岩的划分问题；重要区域性不整合的研究；鉴定变质地层的原岩类型、岩石性质和恢复古环境；正确区分变质地层和ttg岩系以及其他变质深成岩；变质地层时代的确定。
