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Software Defined Network (SDN) makes routing decisions according to the shortest path. This routing scheme does not consider link information such as link residual bandwidth, forwarding delay, packet loss rate and so on. In the case of large data flow, it is easy to cause network congestion, thus reducing the network quality of service assurance. For this reason, using the ability of SDN network controller to monitor the underlying network information and control the route forwarding, we try to set multiple objective functions according to different QoS parameters, and use the non-dominated sorting multi-objective optimization genetic algorithm (NSGA II) based on the elite strategy to make routing decisions. Compared with other routing algorithms, the proposed multi-objective optimization genetic algorithm reduces forwarding delay and packet loss rate, so can effectively prevent network congestion.

We report a case of homicide due to intravenous mercury injection followed by meperidine and sodium cyanide injection. A 35-year-old woman was found dead in bed at home by her husband. Reportedly, she had been sick for more than 5 months. Initial death investigation revealed no evidence of foul play. Her death was believed to be natural. Therefore, her body was buried without an autopsy. Two months after death, her family requested an autopsy because they suspected her physician husband killed her. Her body was exhumed, and an autopsy was performed. Postmortem examination revealed numerous metallic mercury globules in the pulmonary arteries. Toxicological analysis revealed a high concentration of mercury in the tissue samples of the lungs, liver, heart, and kidney. In addition, cyanide and meperidine were also found in the heart and liver. The detailed case history and postmortem examination findings are described.

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