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Search Results: 1 - 10 of 369825 matches for " 张晓伟 "
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极大子群的h-完备与群的可解性
On h-Completion for Maximal Subgroups and the Solvability of Finite Groups
 [PDF]

,
Pure Mathematics (PM) , 2011, DOI: 10.12677/pm.2011.12025
Abstract:
本文给出了有限群G极大子群M h-完备的定义,即称C为M的h-完备,若C是M的θ-完备,且有C = G或存在G的一个子群D使得D不是M的θ-完备,但有C < D成立. 从而,可以通过这个定义把θ-完备的极大性削弱,并得到了有关群可解性的重要结论,丰富了有限群理论。
In this paper, we propose new definition of an h-completion for a maximal subgroup M of a group G, that is a θ-completion C such that either C = G or there exist a subgroup D of G which is not a θ-completion for M and C < D holds. This method can weaken the imposed maximality on θ-completion. Moreover, we studied the solvability and of finite groups by means of h-completion and obtained some important properties, which are very useful to research deeply finite groups.
长江流域中等城市第十一次科技协作交流会纪要

科技进步与对策 , 1994,
Abstract:
在线社交网络下基于信任度的消息传播模型

计算机应用 , 2014,
Abstract: ?社交网络作为一种新兴的媒体具有广泛的社会影响力,且基于社交网络的营销方式逐渐成为一种新的发展趋势,因此研究社交网络中消息的传播具有重大的现实和经济意义。通过借鉴日常生活中人与人之间的信任原理,提出了一种基于信任度的消息传播模型。该模型首先利用个体的公开信息,使用数据挖掘的算法对个体进行分类;然后,根据同类和不同类个体之间的关系计算个体之间的信任度;最后,使用消息与个体的属性相似性以及信任度来计算消息可能传播范围。给出了相应的计算方法,并与两种基准方法对比,结果表明,该模型在准确度上提升15%左右,而所用时间降低50%以上。与数据集统计结果对比,该实验的结果与统计结果相差5%左右,充分表明该模型在实际应用中有比较好的效果。
B-Z化学振荡反应在分析检测中的应用
Application of B-Z Oscillating Chemical Reaction to Analytical Determination
 [PDF]

, , 高锦章
Advances in Analytical Chemistry (AAC) , 2014, DOI: 10.12677/AAC.2014.41002
Abstract: 简单介绍了经典B-Z化学振荡体系,综述了化学振荡的各种行为,规则振荡、混沌、分叉在分析检测中的应用,展望了应用前景。
A brief introduction has been made for classical B-Z oscillation chemical reaction. The application of regular oscillation, chaos, and non-equilibrium stationary state in analytical determination was described. Finally, the prospec- tives of oscillation chemical reaction research and application are prospected.
基于BioPerl实现从NCBI中精确下载LEA基因序列
Based on BioPerl Realize Accurately Download LEA Gene Sequences from the NCBI
 [PDF]

, 曹兴芹,
Hans Journal of Computational Biology (HJCB) , 2014, DOI: 10.12677/HJCB.2014.42002
Abstract:

近年来关于抗逆基因的研究,越来越受研究者们的关注,在新疆尤其重视抗干旱基因的研究。基于这些因素,本文根据LEA基因(late embriogenesis abundant gene, LEA)的保守结构域所在片段(下文简称保守结构片段)和相应的关键词,基于BioPerl设计了从NCBI中精确下载LEA基因序列的程序。此程序不仅解决了LEA基因的精确获取,同时也为不同类型序列的精确下载,提供了一种较好的解决办法。
Recently, researchers have paid more and more attention to the resistance gene research; in Xinjiang, especially the research of drought resistance gene has attached great importance. Based on these factors, according to the conservative domain structure of LEA gene (late embriogenesis abundant gene, LEA) and the corresponding keywords, this paper designed a program that LEA gene sequences was downloaded accurately from NCBI based on the BioPerl. This procedure not only solves the precise acquisition of LEA gene, but also provides a better solution to download different types of sequence exactly.

云计算环境下基于用户偏好的服务选择策略
User Preferences-Based Service Selection Strategy for Cloud Computing
 [PDF]

王瑞锋, 路尚,
Computer Science and Application (CSA) , 2015, DOI: 10.12677/CSA.2015.510048
Abstract: 云计算环境下,服务是指各种抽象的虚拟化的网络资源,伴随着环境的动态化、服务的多样化和用户需求的个性化,服务选择问题越来越重要。把这些服务经过进一步的组合后,以服务组合的方式提供给终端用户,能保证用户能高效地选取服务。本文从用户体验质量的角度,分析云计算环境下用户访问服务的行为特征,利用其访问服务的偏好性,提出基于用户行为偏好的服务选择策略。理论分析和实验结果表明,该策略能保证较高的性能及用户满意度,并能减少时间开销,为用户提供更有效的服务选择方案。
Service of cloud computing refers to all kinds of abstract and virtualized network resources, along with the environmental dynamism, the diversification of the services and personalized user re-quirements. Service selection problem is becoming more and more important. Further combining these services and providing them to end users in the form of service composition can ensure that the users can select service efficiently. The paper analyzes the behavior characteristics of the user to access the service under the cloud computing environment from the perspective of the user ex-perience and puts forward the service selection strategy based on behavior preferences of users by using the access service preferences. Theoretical analysis and experimental results show that the strategy can guarantee high performance and user satisfaction, reduce the time overhead and provide users with more effective service options.
山西省临猗县癫痫现状调查
Situation of Investigation on Epilepsy in Linyi County of Shanxi Province
 [PDF]

, 姚莹, , 李亚楠
International Journal of Psychiatry and Neurology (IJPN) , 2016, DOI: 10.12677/IJPN.2016.53006
Abstract:
目的:分析我国农村地区癫痫病的现状,给国家对于癫痫病的管理方法提供决策。方法:于2015年5月到8月期间随访当地癫痫患者的病因、发作类型、诊治和预后,进行回顾性分析。结果:共入选癫痫患者188例,包括局灶性发作158例,全面性发作17例、点头发作1例,不能确定者12例。均服用苯巴比妥和丙戊酸钠片,疗效为无发作率为22%、显效率为21%、有效率为8%、无效率为49%。病因主要为脑外伤和高热惊厥。部分患者存在社交焦虑症。结论:患者不能正确认识癫痫的基本常识;临床医生要根据发作类型和个体化原则选择抗癫痫药物,推荐在农村地区免费发放的抗癫痫药物目录中增加卡马西平。
Objective: To explore the situation of epilepsy patients in rural areas of Shanxi province in order to provide reference for prevention and treatment of the disease. Methods: From May to August in 2015, 188 patients with epilepsy were retrospectively analyzed on etiology, diagnosis and treatment, classifications and prognosis in the local hospital. Results: All patients took respectively phenobarbital and valproate sodium, including 158 focal seizures, 17 generalized seizures, 1 nod attacks and 12 unclassified seizures. After treatment of antiepileptic drugs, 41 cases (22%) were seizure free; 55 cases (29%) were effectively controlled, while 92 cases (49%) were invalid. The main causes of these patients were brain trauma and febrile convulsion. Many patients had social anxiety in process of seizure. Conclusion: There is a lack of understanding on seizures of epilepsy patients. Antiepileptic drugs must be chosen with good therapeutic effect according to the type of seizure and individuation. In view of the causes and types of seizures, carbamazepine is recommended as a kind of basic antiepileptic drugs in rural areas.
基于查询特征分析的新闻意图自动识别
,,雷声
图书情报工作 , 2014,
Abstract: ?从sogou查询日志中选取样本查询且进行人工标注,通过对标注后新闻查询的分析,提出能用于识别新闻意图的新特征,即查询表达式特征、查询随时间分布特征以及点击结果特征。根据这3个特征,利用决策树分类器实现查询中新闻意图的自动识别,结果发现:①新闻类查询的查询目标主要集中在特定主题信息以及娱乐类信息方面,其查询主题大多为娱乐、政治、体育与经济类信息;②相对非新闻查询,新闻查询具有更可能包含实体、随时间分布波动较大、点击结果之间相似度更高的特点;③本方法对查询中新闻意图的识别效果较好,其宏平均准确率、召回率、f值分别为0.76、0.73、0、74。
绿色翡翠颜色分布规律研究
,郭颖
矿物岩石 , 2011,
Abstract: 采用国际照明委员会CIELAB色度坐标,定量描述了翡翠的绿色,分析了颜色的分布情况,总结其分布规律,建立起翡翠绿色L*、a*、b*、C*、hab的分布关系。当明度较小时,色调角几乎不变,彩度和明度呈现近似的线性相关;当明度变大时,色调角的变化幅度稍大,彩度值在明度中等偏低时变为最大。这些信息将在很大程度上对翡翠绿色分级的细化起到积极作用,可以用来指导翡翠色卡的制备。
回波模拟器在雷达高度计地面测试和定标中的应用
郭 ,
遥感技术与研究 , 2005,
Abstract: 给出了自行研制的回波模拟器实验样机的原理、性能及其对雷达高度计的测试和定标方法,应用该样机对神舟4号飞船的雷达高度计进行了全系统的地面测试和定标实验。实验结果:有效验证了回波模拟器对雷达高度计的测试和定标方法的可行性,有效验证了神舟4号雷达高度计发射前的动态工作性能。 
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