Based on the idea of locating the death in the collapsed area of mine by the gas released from the organism decomposition proposed by the authors, this paper presents the Least Multiply Square (LMS) model for the location and develops two kinds of ANN models for the locating computation.

Limited Corruption in Sealed-Bid Auctions;

Objective To study the new way of estimating the time since death on decomposed corpse.

Analysis of the Prevention Mechanism of Collective Corruption and Collusive Behaviors in the Government Procurement in Game Theory;

This thesis applying the economics standpoint and methods, analyzes the spreading collective corruption, and considers that the collective corruption happens because of the presumption of "rational economic person" and the existing of "scattered interest union".

Collective corruption is a characteristic in China.

Only by insisting on tackling this problem at the root as well as on the surface can the increasing group corruption be contained to carry on the anti - corruption.

Therefore, that taking precautions and struggling against group corruption has became already one of the key points against corruption.

At the present stage, contrast between public authority department s policy - making authority and their iocomes , motives of administrative promotion, psychological and social pressure and social reality of no law being mass, all these primary factors bring out group corruption.