The goal of web service composition is to choose an optimal scheme according to Quantity of Service (QoS) which selects instances in a distributed network. The networks are clustered with some web services such as o...The goal of web service composition is to choose an optimal scheme according to Quantity of Service (QoS) which selects instances in a distributed network. The networks are clustered with some web services such as ontologies, algorithms and rule engines with similar function and interfaces. In this scheme, web services acted as candidate service construct a distributed model which can't obtain the global services' information. The model is utilized to choose instances according to local QoS information in the progress of service composition. Some QoS matrixes are used to record and compare the instance paths and then choose a better one. Simulation result has proven that our ~pproach has a tradeoff between efficiency and ~quality.展开更多
文摘目的探讨奥沙利铂术前化疗对老年胃肠道肿瘤患者术后认知功能障碍(postoperative cognitive dysfunction,POCD)的影响。方法选取择期全凭静脉麻醉下行胃癌、结肠癌或直肠癌根治术的老年患者100例,根据术前有无奥沙利铂化疗史分为术前化疗组(PC组)和非化疗组(NC组),每组50例;同时招募25名老年志愿者为对照组(C组),采用神经心理学测试评估认知功能,观察PC组和NC组患者术后第7天POCD发生情况,多因素Logistic回归分析其发生的独立危险因素。结果 PC组46例、NC组48例和C组25名志愿者均完成所有神经心理学测试。与C组第8天神经心理学测试结果比较,PC组和NC组术后7 d视觉-语言学习测试(包括瞬时和延迟记忆)及数字-符号编码测试评分明显下降,寻迹连线测试和斯特普色词测试完成时间明显延长(P<0.05)。与NC组比较,PC组术后7 d视觉-语言学习测试(瞬时记忆)和数字-符号编码测试评分明显降低(P<0.05)。PC组POCD发生率高于NC组(45.7% vs 25.0%,P<0.05),术后住院时间亦明显延长(P<0.05)。多因素Logistic回归分析结果显示,年龄(≥75岁)和奥沙利铂术前化疗是术后7 d POCD发生的独立危险因素。结论奥沙利铂术前化疗可导致老年胃肠道肿瘤患者POCD发生率升高,延长术后住院时间。
基金National Natural Science Foundation of China,Major National Science and Technology Projects of New Generation Broadband Wireless Mobile Communication Network,the National High Technology Research and Development Program of China (863 Program)
文摘The goal of web service composition is to choose an optimal scheme according to Quantity of Service (QoS) which selects instances in a distributed network. The networks are clustered with some web services such as ontologies, algorithms and rule engines with similar function and interfaces. In this scheme, web services acted as candidate service construct a distributed model which can't obtain the global services' information. The model is utilized to choose instances according to local QoS information in the progress of service composition. Some QoS matrixes are used to record and compare the instance paths and then choose a better one. Simulation result has proven that our ~pproach has a tradeoff between efficiency and ~quality.