Classification accuracy is not enough

We argue that an evaluation of system behavior at the level of the music is required to usefully address the fundamental problems of music genre recognition (MGR), and indeed other tasks of music information retrieval, such as autotagging. A recent review of works in MGR since 1995 shows that most (82 %) measure the capacity of a system to recognize genre by its classification accuracy. After reviewing evaluation in MGR, we show that neither classification accuracy, nor recall and precision, nor confusion tables, necessarily reflect the capacity of a system to recognize genre in musical signals. Hence, such figures of merit cannot be used to reliably rank, promote or discount the genre recognition performance of MGR systems if genre recognition (rather than identification by irrelevant confounding factors) is the objective. This motivates the development of a richer experimental toolbox for evaluating any system designed to intelligently extract information from music signals.     

Ubiquitous Computing in the Biology Laboratory

Our objective is to eliminate the digital divide that persists between the physical and information spaces of wet-lab based enterprises by embedding computational resources into the shared laboratory environment. Our first challenge is to enable individual lab workers to contribute to a fine-grained formal representation of ongoing lab activities - to build the database by doing the work, without having to stop and write things down in a notebook or to enter information into a computer. By eliminating the redundancy of doing the work and then recording it, accuracy and completeness will be improved. And, by capturing information at a finer detail than is practical for manual entry systems, unanticipated applications can be supported.     

直流上电测试和验证

在电子产品设计中,上电特性测试是产品测试和验证的基础.工程师往往需要对功耗、电源特性、浪涌电流等进行测试和验证.而对于复杂的系统,往往要求多路按时序提供电压和电流、并进行测量的动态直流偏置测试.传统的方式是利用多台仪器构成复杂的测试系统,系统的建立和配置都极具挑战性.本文介绍如何利用Agilent N6705A 直流源分析仪,通过最简单的方式完成复杂而繁琐的系统上电测试和验证.     

DS3600系列在嵌入式安全系统中的应用

随着安全性需求不断渗透到电子系统设计制造的各个环节，电子设计人员面临着前所未有的挑战。本文介绍基于DS3600系列安全控制器进行的一些安全系统设计的优势所在。