BACKGROUND The incidence of ingestion of magnetic foreign bodies in the gastrointestinal tract has been increasing year by year.Due to their strong magnetic attraction,if multiple gastrointestinal foreign bodies enter...BACKGROUND The incidence of ingestion of magnetic foreign bodies in the gastrointestinal tract has been increasing year by year.Due to their strong magnetic attraction,if multiple gastrointestinal foreign bodies enter the small intestine,it can lead to serious complications such as intestinal perforation,necrosis,torsion,and bleeding.Severe cases require surgical intervention.CASE SUMMARY We report a 6-year-old child who accidentally swallowed multiple magnetic balls.Under timely and safe anesthesia,the magnetic balls were quickly removed through gastroscopy before entering the small intestine.CONCLUSION General anesthesia with endotracheal intubation can ensure full anesthesia under the condition of fasting for less than 6 h.In order to prevent magnetic foreign bodies from entering the small intestine,timely and effective measures must be taken to remove the foreign bodies.展开更多
In this paper, a new routing algorithm is given for the shuffle-exchange permutation network （SEPn）. The length of the path between any two nodes given by our algorithm is not more than 11/16n^2＋O（n）, i.e., the d...In this paper, a new routing algorithm is given for the shuffle-exchange permutation network （SEPn）. The length of the path between any two nodes given by our algorithm is not more than 11/16n^2＋O（n）, i.e., the diameter of SEPn is at most 11/16n^2＋ O（n）. This improves on a 1/8（9n^2- 22n＋24） routing algorithm described earlier by S. Latifi and P. K. Srimani. We also show that the diameter of SEPn is more than 1/2n^2-n.展开更多
文摘BACKGROUND The incidence of ingestion of magnetic foreign bodies in the gastrointestinal tract has been increasing year by year.Due to their strong magnetic attraction,if multiple gastrointestinal foreign bodies enter the small intestine,it can lead to serious complications such as intestinal perforation,necrosis,torsion,and bleeding.Severe cases require surgical intervention.CASE SUMMARY We report a 6-year-old child who accidentally swallowed multiple magnetic balls.Under timely and safe anesthesia,the magnetic balls were quickly removed through gastroscopy before entering the small intestine.CONCLUSION General anesthesia with endotracheal intubation can ensure full anesthesia under the condition of fasting for less than 6 h.In order to prevent magnetic foreign bodies from entering the small intestine,timely and effective measures must be taken to remove the foreign bodies.
基金This work was supported by the NatLiral Science Foundation of Fujian Provmce(No.Z0511035)the Scientific Research Foundation of Fujian Provincial Education Department(No.JA04249)
文摘In this paper, a new routing algorithm is given for the shuffle-exchange permutation network （SEPn）. The length of the path between any two nodes given by our algorithm is not more than 11/16n^2＋O（n）, i.e., the diameter of SEPn is at most 11/16n^2＋ O（n）. This improves on a 1/8（9n^2- 22n＋24） routing algorithm described earlier by S. Latifi and P. K. Srimani. We also show that the diameter of SEPn is more than 1/2n^2-n.
