Soft computing‐based approach for optimal design of on‐chip comparator and folded‐cascode op‐amp using colliding bodies optimization

This paper presents an efficient approach for the optimal designs of two analog circuits, namely complementary metal oxide semiconductor) two‐stage comparator with p‐channel metal oxide semiconductor input driver and n‐channel input and folded‐cascode operational amplifier using a recently proposed meta‐heuristic‐based optimization algorithm named as colliding bodies optimization (CBO). It is a multi‐agent algorithm that does not depend upon any internal control parameter, making the algorithm extremely simple. The main objective of this paper is to optimize the metal oxide semiconductor (MOS) transistors' sizes using CBO in order to reduce the areas occupied by the circuits and to get better performance parameters of the circuits. Simulation Program with Integrated Circuit Emphasis simulation has been carried out by using the optimal values of MOS transistors' sizes and other design parameters to validate that CBO‐based design is satisfying the desired specifications. Simulation results demonstrate that the design specifications are closely met and the required functionalities are achieved. The simulation results also confirm that the CBO‐based approach is superior to the other algorithms in terms of MOS area and performance parameters like gain, power dissipation, etc., for the examples considered. Copyright © 2016 John Wiley & Sons, Ltd.     

Enhanced colliding bodies optimization for design problems with continuous and discrete variables

Colliding Bodies Optimization (CBO) is a new multi-agent algorithm inspired by a collision between two objects in one-dimension. Each agent is modeled as a body with a specified mass and velocity. A collision occurs between pairs of objects and the new positions of the colliding bodies are updated based on the collision laws. In this paper, Enhanced Colliding Bodies Optimization (ECBO) which uses memory to save some best solutions is developed. In addition, a mechanism is utilized to escape from local optima. The performance of the proposed algorithm is compared to those of standard CBO and some optimization techniques on some benchmark mathematical functions and three standard discrete and continuous structural design problems. Optimization results confirm the validity of the proposed approach.     

下流量控制技术的研究与应用

本文分析了Linux下Traffic Control的原理，阐述了TC中的各组件的功能与相互联系，重点介绍了分类队列规定中的CBQ与HTB队列规定的运行原理和使用方法，并以实例的形式将CBQ和HTB应用于实际的网络中，最后对流量控制技术的应用提出了自己的看法。     

ORACLE中SQL执行原理及性能优化研究

SQL性能优化是一个系统工程,熟知SQL语法并不能保证SQL语句的高效。从分析ORACLE数据库中SQL语句执行原理入手,指出减少SQL语句的解析次数和优化CBO是SQL性能优化的重点,并用实例验证了使用绑定变量和高速缓存游标在提高SQL性能方面的重要作用。CBO将输入的SQL语句转化为实际的执行计划,而执行计划的优劣又主要依赖于初始化参数与统计信息的质量,因此在优化CBO中重点阐述了如何设置影响CBO行为的初始化参数及收集统计信息必须遵守的五条原则。     

An efficient identification approach for stable and unstable nonlinear systems using Colliding Bodies Optimization algorithm

This paper presents an efficient approach to identify different stable and practically useful Hammerstein models as well as unstable nonlinear process along with its stable closed loop counterpart with the help of an evolutionary algorithm as Colliding Bodies Optimization (CBO) optimization algorithm. The performance measures of the CBO based optimization approach such as precision, accuracy are justified with the minimum output mean square value (MSE) which signifies that the amount of bias and variance in the output domain are also the least. It is also observed that the optimization of output MSE in the presence of outliers has resulted in a very close estimation of the output parameters consistently, which also justifies the effective general applicability of the CBO algorithm towards the system identification problem and also establishes the practical usefulness of the applied approach. Optimum values of the MSEs, computational times and statistical information of the MSEs are all found to be the superior as compared with those of the other existing similar types of stochastic algorithms based approaches reported in different recent literature, which establish the robustness and efficiency of the applied CBO based identification scheme.     

面向对象软件扇入耦合度量研究

针对C＆K度量组中耦合度量指标（CBO）没有区分扇入耦合和扇出耦合对软件质量影响的情况，提出了一组正交的对象间扇入耦合度量组，并对该度量组中各度量指标对软件质量的指示作用进行了讨论。在Frank Sauer开发的基于Eclipse度量计算插件的基础上实现了该度量组中各度量指标的自动计算。最后，通过对JUnit3．8．1和JUnit7．0扇入耦合度量计算结果的分析，验证了该文提出的扇入耦合度量组的有效性。     

Oracle直方图

介绍了Oracle的2种直方图,即频率直方图和高度均衡直方图的原理及使用策略,同时对这2种直方图的优缺点进行了相关讨论.结果表明:只有当输入值的可见程度很高时,使用直方图才会带来益处.