结合积分方程(IE)方法和时域有限差分(FDTD)方法来预测远程Loran-C地波传播。 IE-FDTD组合算法能够对地形细节进行建模,比积分方程方法具有更高的精度。 另一方面,与完整的FDTD解决方案相比,它大大节省了计算资源。 沿宣城和松山之间的两条路径的测量结果被用于验证所提出的算法。
2021-03-02 21:05:47 1.56MB Finite-difference time domain (FDTD)
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针对单负载,垂直变形引起的传统MEMS(微机电系统)谐振器窄带和谐振频率固定的问题,提出了一种新型的具有超宽带,可调谐频率和基于垂直方向两级调节特性的MEMS谐振器。和水平负载。 建立了水平和垂直负载双级调节谐振器的微分方程,推导了两端锚定的谐振器的频率方程。 提出的谐振器的中心频率为17.7 MHz,两级范围分别为395480 ppm和16 ppm。
2021-03-02 17:05:04 1.45MB Surface acoustic waves Frequency-domain
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[WIP]我第一次尝试使用Symfony在PHP中实现Clean Architecture 去做 审查基础架构组织 查看名称空间 测验 诗篇/ PHPStan 验证
2021-03-02 12:06:23 197KB php ddd domain-driven-design clean-architecture
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尽管中国的MOOC用户数量急剧增加,但由于对课程结构,前提课程等的不熟悉,用户仍然面临半途放弃学习的风险。 为解决此问题,MKD通过提供清晰的课程结构图,帮助用户认识适当的学习路径以及知识关系,从而发挥了重要作用。 在本文中,基于在线课程提出了一种构建中文可用MKD的方法。 在线课程数据是通过从MOOC站点上进行Web爬网获取的,然后通过数据清理和数据融合进行处理,然后提取和评估MKD。 这种方法适用于所有现有的MOOC课程,因此具有实际意义。
2021-02-26 09:05:37 128KB MOOCs Mapping Knowledge Domain
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As a Model-Driven Development methodology (MDD) for the specific domain, Domain-Specific Modeling (DSM) has been widely and successfully used in system design and analysis of specific areas. In spite of its general important, due to informal definition of Domain-Specific Modeling Language (DSMLs), t
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Domain-Specific Modeling Language (DSML) defined by informal way cannot precisely represent its structural semantics, so properties of models such as consistency cannot be systematically analyzed and verified. In response, the paper proposes an approach for automatical-ly reasoning consistency of DS
2021-02-21 19:09:49 3MB Domain-Specific Modeling Language (DSML);
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Domain-Specific Modeling has been widely and successfully used in system design and modeling of specific areas. Due to informal definition of Domain-Specific Modeling Language (DSML) and Meta-Modeling Language (DSMML), the structural semantics of DSMLs and DSMMLs cannot be strictly described and the
2021-02-21 19:09:49 208KB Domain-Specific Modeling Language (DSML);
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Due to informal definition of Domain-Specific Metamodeling Language (DSMML), properties of metamodels built based on DSMML cannot be precisely and automatically analyzed. In response, based on formalization of DSMML named XMML, the paper proposes an automatic mapping mechanism for formalizing metamo
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安卓增加自启动守护进程时,selinux权限的增加方式
2021-02-18 20:01:00 346KB selinux seandroid 自启动 守护进程
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IFC4 的领域(Domain)和实体(entitie)集合,整理了一点点
2021-02-15 12:03:57 54KB IFC
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