In chapter 2 , the channel assignment techniques in the inter - spotbeam of the leo - mss are studied . a new channel allocation scheme ica ( namely , initial channel assignment ) is introduced according to the inherent characteristic of leo - mss . the proposed ica scheme can handle non - uniform traffic distribution over the coverage and guarantee the fairness for all cells and the priority for the cells where traffic conditions are heavy 第二章研究leo系统波束切换中的信道分配策略,结合leo系统的自身特点提出简单有效的初始信道分配( initialchannelassignment , ica )策略,该策略可在用户非均匀分布下较好工作,同时保证业务量大的小区的优先级和各小区之间的公平性。
Considering the unsymmetrical distribution of interface states induced by hot - carrier effects along the channel , the quasi - two - dimensional analysis methods are used to deduced the drain current , threshold voltage and electrical field in channel after hot - carrier degradation and the theoretical results are fully verified with the experimental data and m1ntmos6 . 0 simulation output . the degradations of device output conductance , subthreshold conduction and rf characteristics are also analyzed 针对mos器件热载流子退化所引入的界面态，根据其沿沟道非均匀分布的模型，采用准二维分析方法对退化后器件的漏源电流、阈值电压和饱和区沟道电场作了详细的理论推导，并与实验结果和器件二维数值模拟软件minimos6 . 0的计算结果进行了验证比较。
In the numerical models studies , it is necessary to estimating the area - averaged flux of a grid including many kinds of surface types . due to different scales of land surface spatial heterogeneity , there is a considerable debate , however , over the influence of sub - grid scale land surface heterogeneity on the computation of all grid - scale flux between the land surface and atmosphere , and over the necessary to parameterize all types of the influence induced by land surface heterogeneities 在数值模式研究中，需要确定包含了各种陆面类型的某一区域的平均通量，而真实的自然陆面具有多重尺度的非均匀性，次网格非均匀分布对地气之间的各类通量计算的影响到底有多大，是否要对所有的非均匀性的影响都要考虑等都有进一步研究的必要。
