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[Software Engineering] chaos DL : 0: 研究了具有滞后非线性的汽车悬架在路面拟周期激励作用下发生受迫振动时的混沌运动。首先用melnikov方法给出了发生混沌运动的临界条件，然后研究了非线性阻尼力中的各系数对混沌的影响，最后通过Poincare截面及Li指数揭示出在此系统中存在着从拟周期运动通向混沌运动的可能性-Studied with a lag in road vehicle suspension nonlinear excitation of quasi-periodic forced vibration under the action of chaotic motion when. The first method used melnikov gives the critical condition for chaotic motion, and then study the nonlinear damping force of the impact of each factor on the chaos, and finally through the Poincare section and Li index reveals the existence of this system from the quasi-periodic motion leading to the possibility of chaotic motion
Date : 2025-12-18 Size : 151kb User : chenlijie
[Software Engineering] critical-section DL : 0: 临界区介绍以及多线程、多进程临界区调度原则、代码示例-The critical section describes scheduling principles, code samples, and multi-threaded, multi-process critical section
Date : 2025-12-18 Size : 9kb User : chaoli
[Software Engineering] SoftwareEngineeringManagement-plan DL : 0: Software engineering project part, introduced the project plan, including the content and specifically explain the critical section
Date : 2025-12-18 Size : 72kb User : 袁苑
[Software Engineering] Java-Virtual-Machine DL : 0: Java虚拟机使用锁机制来实现多线程共享数据结构的同步.锁机制维护的临界区通常对共享数据结构只进行读操作.只读锁是指当某个线程持有锁在只读临界区时,其他线程可以直接进入只读临界区而无需等待.只读锁能极大地提高锁机制的同步性能.Java虚拟机的锁机制可分为轻量级锁和重量级锁两层,当线程冲突时从轻量级锁转向重量级锁.本文分别从轻量级锁和重量级锁两个层次分别进行只读锁优化.轻量级锁的只读优化算法可以减少原子操作的开销；重量级锁的只读优化算法则可以使多个线程同时在只读临界区中.最后在Java虚拟机HotSpot中实现只读锁优化,并且在龙芯3A上进行实验.性能测试用例包括单线程Java程序、多线程Java程序以及SPECjvm2008.实验结果表明,上述优化方法能极大降低线程进入和退出只读临界区的开销,提高Java虚拟机的同步性能.-Java virtual machine to use locking mechanism to realize multi-thread synchronization. Locking mechanism for shared data structures to maintain the critical area of shared data structures are usually read-only operations. Read-only lock means that when a thread holding a lock on the read-only critical section other threads can go directly to the read-only critical section without waiting. read-only lock can greatly improve the performance of synchronization lock mechanism. locking mechanism for the Java virtual machine can be divided into lightweight and heavyweight locks lock layers, when the thread conflict from the lightweight heavyweight steering lock lock lock this paper from lightweight and heavyweight lock two levels were optimized for read-only lock lightweight lock read-only optimization algorithm can reduce the overhead of atomic operations . heavyweight a read-only lock can enable optimization of multiple threads in the critical region in a read only last a read-only lock to
Date : 2025-12-18 Size : 879kb User : 温智彬