目的探讨创伤性脑梗死的CT表现特征,提高对创伤性梗脑死的认识。方法分析16例创伤性脑梗死患者的临床与CT表现。结果 16例创伤性脑梗死病例中,13例可见原发颅脑损伤;3例首次CT检查阴性,创伤后3 d^15 d CT复查发现脑梗死。创伤性脑梗死C...目的探讨创伤性脑梗死的CT表现特征,提高对创伤性梗脑死的认识。方法分析16例创伤性脑梗死患者的临床与CT表现。结果 16例创伤性脑梗死病例中,13例可见原发颅脑损伤;3例首次CT检查阴性,创伤后3 d^15 d CT复查发现脑梗死。创伤性脑梗死CT表现为基底节区、脑室旁或脑叶低密度梗死灶。1例多发颅脑损伤合并大面积脑梗死,经治疗无效死亡。结论 CT对成人创伤性脑梗死有很大的诊断价值,是首选诊断方法。展开更多
Some ideas in the development of fault diagnosis system for spacecraft are introduced. Firstly, the architecture of spacecraft fault diagnosis is proposed hierarchically with four diagnosis frames, i.e., system level,...Some ideas in the development of fault diagnosis system for spacecraft are introduced. Firstly, the architecture of spacecraft fault diagnosis is proposed hierarchically with four diagnosis frames, i.e., system level, subsystem level, component level and element level. Secondly, a hierarchical diagnosis model is expressed with four layers, i.e., sensors layer, function layer, behavior layer and structure layer. These layers are used to work together to accomplish the fault alarm, diagnosis and localization. Thirdly, a fault-tree-oriented hybrid knowledge representation based on frame and generalized rule and its relevant reasoning strategy is put forward. Finally, a diagnosis case for spacecraft power system is exemplified combining the above with a powerful expert system development tool G2.展开更多
文摘Some ideas in the development of fault diagnosis system for spacecraft are introduced. Firstly, the architecture of spacecraft fault diagnosis is proposed hierarchically with four diagnosis frames, i.e., system level, subsystem level, component level and element level. Secondly, a hierarchical diagnosis model is expressed with four layers, i.e., sensors layer, function layer, behavior layer and structure layer. These layers are used to work together to accomplish the fault alarm, diagnosis and localization. Thirdly, a fault-tree-oriented hybrid knowledge representation based on frame and generalized rule and its relevant reasoning strategy is put forward. Finally, a diagnosis case for spacecraft power system is exemplified combining the above with a powerful expert system development tool G2.
