排序方式: 共有8条查询结果,搜索用时 125 毫秒
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对嵌入式软件在线升级有利于维持系统的稳定性,可实现在线测试,支持系统在线重构,是提高系统可靠性的有效途径。对嵌入式软件的在线升级进行了研究,研究了在线升级的颗粒度和升级点的选择,分析了程序状态的识别和恢复,提出了采用动态分析与静态分析相结合的方法保证升级的安全的方法,实现了在线升级方案。基于在线升级方案构建嵌入式软件系统,实现了应用系统软件的模块级粒度的升级。最后基于在线升级系统设计实现了小卫星星务管理软件,具备了灵活的在线升级能力,表明在线升级系统具有很好的工程实用价值。 相似文献
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The Maxwell-Chern-Simons gauge theory coupled to a complex scalar field is quantized in the Becchi-Rouet-Stora-Tyutin path integral formalism. Based on the symmetries of a constrained canonical (Hamiltonian) system, we obtain the quantal conserved angular momentum of the system under the global symmetry transformation. It is shown that fractional spin also appears at the quantum level. The canonical Ward identities for this system are derived under local gauge transformation. 相似文献
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1引言众所周知,某些复杂的工业过程用线性近似动态模型是不适宜的,而且许多对象如工业生产,生态,生物和社会经济等过程可以用双线性模型自然描述,能够在稳态工作点的一个较大领域内描述一大类严重非线性系统的动态特性,描述精度优于传统的线性模型 相似文献
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A new approach for protein design based on the relative entropy 总被引:2,自引:0,他引:2
A new effective and fast minimization approach completely based on the physical theory is proposed for protein design. The
sequence space is essentially searched according to the Boltzmann distribution. In this approach, the relative entropy is
used as a minimization object function. The method has been tested on an off-lattice model of proteins and the results are
better than those obtained from other similar work. Therefore, it can be applied as a uniform frame for both folding and inverse
folding of proteins. 相似文献
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提出了亲水作用-高效液相色谱法测定不同烟草部位中烟碱含量的方法。采用Atlantis HILIC色谱柱(150mm×4.6mm,5μm)分离,以乙腈、10mmol·L-1乙酸铵溶液和冰乙酸以体积比72比28比2组成的混合液为流动相,在检测波长260nm处进行测定。烟碱的质量浓度在0.001~0.1g·L-1范围内与峰面积呈线性关系,方法检出限(3S/N)为0.17mg·L-1。进行3个浓度水平的加标回收试验,测得回收率在98.2%~98.9%之间,相对标准偏差(n=6)小于2.0%。从烟草的不同部位取样,按本法分析,结果表明:其烟碱含量从烟叶的上部、中部、下部至烟梗逐渐减少。 相似文献
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