关于Halin图的色数问题

对《Ｈａｌｉｎ图的色性》一文中关于Ｈａｌｉｎ图Ｇ的色数和边色数的两个定理给出了新的证明，并确定了Ｇ的最大度数（△（Ｇ）为４时的Ｈａｌｉｎ图的全色数（ｘｒ（Ｇ）为５，仙此解决了该文中未解决的问题。     

△（G）=3时的Halin图的边面全色数

研究３－正则Ｈａｌｉｎ图的边面全色数问题,证明了《最大度△（Ｈｇ）≥７及△（Ｈｇ）＝４,５,６的Ｈａｌｉｎ图的边面全色数》一文提出的如下猜想成立：对△（Ｇ）＝３时的Ｈａｌｉｎ图有４≤Ｘｅｆ（Ｇ）≤,这里△（Ｇ）表示图Ｇ的最大度数,Ｘｅｆ表示图Ｇ的边面全色数。     

Heuristic Quasi-physical Algorithm for Protein Structure Prediction

A three-dimensional off-lattice protein model with two species of monomers, hydrophobic and hydrophilic, is studied. Enligh- tened by the law of reciprocity among things in the physical world, a heuristic quasi-physical algorithm for protein structure prediction problem is put forward. First, by elaborately simulating the movement of the smooth elastic balls in the physical world, the algorithm finds low energy configurations for a given monomer chain. An ＂off-trap＂ strategy is then proposed to get out of local minima. Experimental results show promising performance. For all chains with lengths 13≤n ≤55, the proposed algorithm finds states with lower energy than the putative ground states reported in literatures. Furthermore, for chain lengths n = 21, 34, and 55, the algorithm finds new low energy configurations different from those given in literatures.