A New Multi-Agent Feature Wrapper Machine Learning Approach for Heart Disease Diagnosis

Heart disease (HD) is a serious widespread life-threatening disease. The heart of patients with HD fails to pump sufficient amounts of blood to the entire body. Diagnosing the occurrence of HD early and efficiently may prevent the manifestation of the debilitating effects of this disease and aid in its effective treatment. Classical methods for diagnosing HD are sometimes unreliable and insufficient in analyzing the related symptoms. As an alternative, noninvasive medical procedures based on machine learning (ML) methods provide reliable HD diagnosis and efficient prediction of HD conditions. However, the existing models of automated ML-based HD diagnostic methods cannot satisfy clinical evaluation criteria because of their inability to recognize anomalies in extracted symptoms represented as classification features from patients with HD. In this study, we propose an automated heart disease diagnosis (AHDD) system that integrates a binary convolutional neural network (CNN) with a new multi-agent feature wrapper (MAFW) model. The MAFW model consists of four software agents that operate a genetic algorithm (GA), a support vector machine (SVM), and Naïve Bayes (NB). The agents instruct the GA to perform a global search on HD features and adjust the weights of SVM and BN during initial classification. A final tuning to CNN is then performed to ensure that the best set of features are included in HD identification. The CNN consists of five layers that categorize patients as healthy or with HD according to the analysis of optimized HD features. We evaluate the classification performance of the proposed AHDD system via 12 common ML techniques and conventional CNN models by using a cross-validation technique and by assessing six evaluation criteria. The AHDD system achieves the highest accuracy of 90.1%, whereas the other ML and conventional CNN models attain only 72.3%–83.8% accuracy on average. Therefore, the AHDD system proposed herein has the highest capability to identify patients with HD. This system can be used by medical practitioners to diagnose HD efficiently.     

基于ARM平台的高清视频信号编解码器优化设计

由于原始编解码器存在编解码速度慢,耗费时间长的问题,无法满足人们需求,提出了基于ARM平台的高清视频信号编解码器优化设计。在ARM平台下对接口进行分离,从代码和结构两方面对编码器进行精简,进而对相应程序进行优化;针对解码器优化过程,优化C级别和熵解码,并移除多余结构体以及冗余函数,重新建立哈夫曼查表,完成高清视频信号快速解码。通过实验验证结果可知,优化后的编解码器速度快,且耗费时间较短。     

校园网高清视频直播传输系统设计

为了在提高视频画面质量的同时不增加网络负载,根据学校网络结构的特点,分析数据在传输过程中的一些关键技术指标,采用多级软件组播的思想,提出一种具有并发能力强、实时性高、高清稳定的视频直播传输系统.该系统解决了节点加入与退出的管理,单点故障处理,跨校区分布式部署等问题,既能保证用户观看效果又能提升网络带宽的利用率.     

用PCL-839步进电机控制卡开发石油筛管的数控系统

针对国内筛管数控系统移植性存在的问题，用PCL-839卡开发一套专用开放式数控系统。根据筛管图形，确定了加工方案；对PCL-839卡工作原理及功能进行分析；以VC＋＋为软件开发平台，对数控系统进行研究开发。     

河北电视台高清演播室内部通话系统设计

介绍高清演播室中内部通话系统的构成,并结合河北电视台高清演播室装配的通话系统,阐述了不同工作区域内部通话的各自特点,重点介绍通过控制软件ECS设置通话矩阵的功能.     

A study of the properties of compacts from silicified microcrystalline celluloses

The paper deals with a study of tensile strength and disintegration time of compacts made from silicified microcrystalline celluloses, Prosolv SMCC 90, and Prosolv HD 90, in dependence on compression force, addition of two types of lubricants, and two active ingredients. The lubricants were magnesium stearate and sodium stearyl fumarate in a concentration of 0.5%, the active ingredients being ascorbic acid and acetylsalicylic acid in a concentration of 50%.

Prosolv SMCC 90 proved to be better compatible than Prosolv HD 90; the compacts were of higher strength, which was markedly increased with increasing compression force. Prosolv HD 90 was more sensitive to additions of lubricants, and a greater decrease in strength was recorded due to the influence of sodium stearyl fumarate. The effect of lubricants on the strength of compacts in the presence of active ingredients was not identical. The disintegration time of compacts from Prosolv HD 90 without as well as with lubricants was shorter than from Prosolv SMCC 90 and was increasing with increasing compression force. Disintegration time was increased with added lubricants, and it was markedly shortened by addition of active ingredients. Compacts containing ascorbic acid possessed a shorter disintegration time than those containing acetylsalicylic acid, and it was not markedly influenced by the presence of lubricants.     

基于以太网络的宇航用高清摄像机的硬件设计

由于目前现有工业用摄像机无法满足空间大温度范围、强振动环境等要求,提出了能够适应空间环境的基于以太网络视频传输的高清一体摄像机.该摄像机在完成包括H.264,JPEG2000,MPEG4等图像编码算法的同时,支持空间以太网络协议进行传输和控制.针对宇航环境使用要求,从结构设计、力学设计、热设计、电磁兼容设计等方面进行可靠性设计和仿真验证,满足质量轻、温度适应性好、可靠性高等要求.经过鉴定试验验证,所设计的高清一体摄像机可以可靠地在空间严苛环境中工作.     

计算机等级考试上机考试系统中的问题与解决

针对四川省高校计算机等级考试上机考试系统中存在的服务器与客户机的连接方式选择、试卷内容发送、考试计时等主要问题,提出了解决方法。     

计算机辅助插销试验裂纹评定系统的研制

播销试验是评估金属材料焊接裂纹倾向的试验方法。为了提高该试验方法的可靠性、精度和自动化程度。研制了一个以PCL-818LS数据采集卡为核心的计算机辅助智控系统。通过大量冷裂纹和再热裂纹插销试验表明，整个系统的可靠性和精度能满足试验要求。     

HD/SHD still image database system and image distribution in broadband network applications

This paper focuses on a practical design for an efficient scalable image database and retrieval system over broadband networks. It describes a concrete solution for the implementation of HD/SHD (high-definition/super-high-definition) still image retrieval services which can be used in different applications. The structure of the complete system, consisting of a directory server, an image server, and MMI (man-machine interface) devices, has been presented, detailing each element and their corresponding functions. The desired HD/SHD image is displayed on the HD-PDP (plasma display panel) with the aid of image matching. The proposed system generates image index automatically, eliminating special skills in preparing index images and crucially reducing the processing time (from 35 min to 110 s), and does not use keywords. It has been also shown that these indices can be used for quite accurate image retrieval, i.e., the system provides high precision rates (currently up to 98%) to the user, eliminating troubles encountered in the image retrieval operations due to limitation on the user’s age, culture, knowledge, and languages.The broadband IP networks currently have a number of issues from the viewpoint of practical system operations, and so the requirements and issues needed for the networks are discussed from the viewpoint of in-service performance, differentiation among different types of services, secure connections, and so on, focusing on handling of HD/SHD still images.