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基于本体的图书馆文献资源共享技术研究 总被引：5，自引：0，他引：5
图书馆文献资源共享是图书馆发展的一个重要标志，为了实现文献的共享和重用，解决图书馆文献资源检索中语义信息表达问题，将本体思想引入文献信息知识表示中。提出了图书文献资源本体概念的结构层次和体现形式，构造了OIL描述的图书馆文献资源知识本体，给出了用XML Schema实现OIL描述的资源知识本体的方法。 相似文献
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雨课堂是将课前、课上以及课后等教学环节有机连为一体的信息化教学平台,是对传统课堂教学的有益补充。文章借助雨课堂教学平台,将TRIZ创新理论应用于《C语言程序设计》教学,实现以学生为中心的教学,提升教学质量,同时培养了学生的科学思维能力、实践能力、合作精神及科学创新能力。 相似文献
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《Journal of The Franklin Institute》2021,358(13):6526-6544
This paper investigates a class of nonlinear systems with actuator fault. In particular, fuzzy logic systems have been used to approximate the unknown nonlinear functions, backstepping procedure is adopted to design controller for the system with mismatched condition, command filter is utilized to eliminate the explosion of complexity of the backstepping and also to compensate the output of a filter subjected to the derivative of the virtual control. The stability of the closed-loop system and the convergence of the tracking error are proved via Lyapunov Theorem. In addition, two numerical simulation examples are illustrated the effectiveness of the proposed approach. 相似文献
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《Journal of The Franklin Institute》2021,358(13):6408-6432
This paper considers the control problem of spacecraft line-of-sight (LOS) relative motion with thrust saturation in the presence of unmodeled dynamics, external disturbance and unknown mass property. By using skew-symmetric property, reference trajectory generator and anti-windup technique, a novel passivity-based adaptive sliding mode control (SMC) scheme is proposed without prior knowledge of uncertainty/disturbance bound. Within the Lyapunov framework, the establishment of a real sliding mode (which induces the practical stability of closed-loop error system) is validated. The main contributions are that a new control gain adaptive algorithm is adopted to attenuate the overestimation of switching gain and a differentiable projection-based parameter adaptive algorithm is proposed to force the mass approximator to remain in a desired domain, then the adaptive control law is modified by the reference trajectory generator and anti-windup technique to compensate for the effect of thrust saturation. Finally, simulations are conducted to show the fine performance of proposed control scheme. 相似文献
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海洋生态系统的健康和安全,直接关系到全人类的健康和福祉。有效监测数据不足、科学决策信息缺失等因素一定程度上影响了海洋可持续发展目标(SDG 14)的顺利实施。地球大数据具备宏观、动态、客观监测能力,可在支撑SDG 14实现中起到重要作用。在中国科学院战略性先导科技专项(A类)的支持下,基于地球大数据相关技术和方法,我国已有效开展了海洋缺失数据集生产、目标本地化模型构建等具体实践。在以上分析基础上,文章提出了积极参与国际社会地球大数据共享,加强科技创新对SDG 14实现的驱动,深度参与联合国海洋治理计划等建议。 相似文献
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1930年代,老舍在文学创作上,呈现出向左翼功利性文学观念倾斜和对原有启蒙文学观念恪守的双重特点.一方面,老舍将艺术视野收回到严肃的现实,从政治、经济、社会制度等角度批判现实,颂扬革命,从而增强了其作品的时代性.另一方面,老舍并没有忽视文学的审美特质,仍然注重对艺术规律的强调,坚持国民性批判的启蒙文学主题.这样,老舍在早期文化批判的基础上进一步加强了社会批判的力度,从而使社会批判和文化批判有机地结合在一起,其创作逐渐走向成熟. 相似文献