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communication frequency
    The L(2, l)-labeling Problem on Graphs and the Moving Communication Frequency Assignment Problem
    图的L(2,1)标号与移动通讯频率分配问题
    On the L(2,1)-labeling problem on graphs and the problem of moving communication frequency assignment
    图的L(2,1)-标号与移动通讯频率分配问题
    The moving communication frequency assignment problem can be transformed into an L(2,1)-labeling problem on a graph.
    移动通讯频率分配问题可以转化为图的L(2,1)-标号问题。
    This paper firstly corrects a wrong result given by refernece [1],then gives the edge spans of L(2,1)-labeling and lambda-L(2,1)-labeling of the above two kinds of graphs,so the moving communication frequency assignment problem is completely solved.
    首先研究了参考文献[1]中的一个错误结果,并精确刻划了上述两类图的L(2,1)-标号的边跨距及λ-L(2,1)-标号的边跨距,从而全面地解决了平面格子图、三角格子图上的移动通讯频率分配问题。
    An L (2,1) labeling of a graph G is a function f from the vertex set V(G) to the set of all nonnegative integers such that |f(x)-f(y)|2 if d(x,y) =1 and |f(x)-f(y)| 1 if d(x,y) =2.The moving communication frequency assignment problem can be transformed into an L(2,1) labeling problem on a graph.
    图G的L(2 ,1 )标号是一个从顶点集V(G)到非负整数集的函数f(x) ,使得若d(x ,y) =1 ,则|f(x) -f(y) | 2 ; 若d(x ,y) =2 ,则 |f(x) -f(y) | 1 .移动通讯频率分配问题可以转化为图的L(2 ,1 )标号问题 .
    An L(2,1)-labeling of a graph G is a function,from the vertex set V(G)to theset of all nonnegative integers such that |f(x)-f(y)|≥2 if d(x,y)=1 and |f(x)-f(y)|≥1 if d(x,y)=2.The moving communication frequency assignment problem canbe transformed into an L(2,1)-labeling problem on a graph.
    图G的L(2,1)标号是一个从顶点集V(G)到非负整数集的函数f(x),使得若d(x,y)=1,则|f(x)-f(y)|≥2; 若d(x,y)=2,则|f(x)-f(y)|≥1.移动通讯频率分配问题可以转化为图的L(2,1)标号问题.
    With defer potential of harmonic fields in whole-space lossy medium, the closed expressions have been derived under quasi-static condition, which leads to analysis directivity of harmonic dipole antenna, field zones and relationships between field, earth resistivity, communication frequency and distance.
    本文利用全空间有耗媒质中谐变场的推迟位,在准静态条件下导出了电偶极子场的闭合解析公式,分析了谐变偶极子天线的方向性和场区以及无线通讯中场区与大地电阻率、通讯频率、通信距离等之间的关系。
 

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