一种JavaIC卡专用CPU结构研究

本文提出了一种针对Java卡虚拟机的硬件结构.Java卡虚拟机是Java语言与智能卡之间的接口,开发支持Java语言的智能卡对IC卡的发展十分重要.现有的智能卡中实现的Java卡虚拟机性能较差,本文给出一种基于Java卡虚拟机的专用CPU结构,该结构直接执行Java字节码,并采用了两条指令合并机制.文中将详细介绍所提出的硬件结构,包括指令集的选取,模块划分及各功能模块结构,并着重介绍硬件结构中的两条指令同时执行机制的实现.     

JAVA语言在网络通信程序中的实际应用

随着计算机技术的不断深化改革,Java语言作为Sun公司研发的一项面对对象的计算机程序语言,具有多项优点,它的主要特点是具有强大的网络编程接口,能够使网络编程能够与面对对象编程方式更进一步,还能优化网络编程方式。因此,本文就Java语言在网络通信程序中的实际应用进行了分析与研究,并提出建议。     

Java平台结构分析

Java平台由Java虚拟机和Java API(Java应用编程接口)组成，本文重点介绍了这两项关键技术，从其内部结构的设计上分析了Java平台具有的特性。     

用于呼叫控制的JAIN SIP

综合网络的Java应用编程接口(JAIN,Java API for Integrated Networks)是一组基于Java技术的API,这些接口将业务可移植性、网络聚合以及安全的网络接入引进电话网和数据网络,使得在Java平台上快速开发下一代电信产品和服务成为可能。本文在简要介绍了JAIN之后,重点介绍了JAIN SIP API。     

XML的编程接口

XML的多种编程接口为开发人员使用XML文档提供了一致的接口。目前有许多应用编程接口API可以使用，本文研究最流行和广泛使用的API中的4种：文档对象模型(Doeu—ment Object Model(DOM))、用于XML的简单API(Simple API for XML(SAX))、JDOM和用于XML解析的Java API(Java API for XML Parsing (JAXP))。     

用于呼叫控制的JAIN SIP

综合网络的Java应用编程接口(JAIN，Java API for Integrated Networks)是一组基于Java技术的API，这些接口将业务可移植性、网络聚合以及安全的网络接入引进电话网和数据网络，使得在Java平台上快速开发下一代电信产品和服务成为可能。本文在简要介绍了JAIN之后，重点介绍了JAIN SIP API。     

浅谈Java中方法的参数传值

Java中,方法参数传值是很常见也是很重要的知识点。参数传值中,基本数据类型的传值是很容易理解和掌握的,而引用类型参数传值在面向接口编程以及面向抽象类编程中是关键的知识点,只有掌握了引用类型参数传值,才能更好地学习Java语言。     

单片机与液晶显示器的接口及应用

在介绍图形点阵式液晶显示模块GTG240128的结构和功能的基础上,讨论了其与AT89C55单片机的硬件接口电路和接口软件编程方法,并给出了写指令、写数据、初始化和汉字显示等通用程序。     

单片机与液晶显示器的接口

本文在介绍了图形点阵式液晶显示模块GTG240128的结构、功能的基础上,讨论了其与AT89C55单片机的硬件接口电路及接口软件编程方法,并给出了写指令、写数据、初始化、汉字显示等通用程序。     

基于Agent的VisualC++COM编程实现技术

Microsoft Agent可提供人性化编程技术，可使计算机具有更好的人机交互性，其应用前景相当广泛。它支持VC 、VB、Java、JScript和VBScript等多种编程语言，并提供多种编程方法，文章讨论利用VC 的MFC类库技术直接使用COM对象接口来编程，从这一点出发，详细介绍了基于Agent的VC MFC基本编程方法和实现技术，并给出实例。     

Mapreduce模型及支撑系统概述

MapReduce是由并行编程模型及相关支撑系统组成的数据处理框架,通过定义接口和运行时支持库,通过定义良好的接口和运行时支持库,能够自动并行执行大规模计算任务,通过隐藏底层实现细节,降低实现并行编程的难度,Hadoop是目前MapReduce框架最流行的开源实现.文章首先介绍了MapReduce并行编程模型及其hadoop的运行原理、运行机制,深入研究了MapReduce计算任务在Hadoop系统中的运行过程.     

A parallel FDTD algorithm using the MPI library

In this paper, we describe the essential elements of a parallel algorithm for the FDTD method using the MPI (message passing interface) library. To simplify and accelerate the algorithm, an MPI Cartesian 2D topology is used. The inter-process communications are optimized by the use of derived data types. A general approach is also explained for parallelizing the auxiliary tools, such as far-field computation, thin-wire treatment, etc. For PMLs, we have used a new method that makes it unnecessary to split the field components. This considerably simplifies the computer programming, and is compatible with the parallel algorithm     

Teaching content creation with programming

Multimedia is an art form that uses computers as a means of personal expression. However, much multimedia content is unattractive, and many applications have poor user interfaces because many developers don't have training in both programming and content creation. To counteract this, we teach students QuickTime for Java, which provides a rich library for manipulating media. Our students reported an increased understanding of multimedia programming and developed creative skills.     

Message-Passing Programming for Embedded Multicore Signal-Processing Platforms

Recently, embedded multicore platforms have become popular for signal processing, but software development for such platforms is still very slow. First, parallel programming is more challenging than sequential programming to average programmers. To make the problem worse, software is not portable among the platforms, since each multicore signal-processing platform offers its own programming interface/language. We believe this problem can be relieved by adding the support of a standard message-passing programming to embedded multicore platforms. In particular, we would like to leverage MPI, the most successful message-passing system, which practically enables the development of portable applications to run on many parallel machines. There are technical challenges to support MPI on embedded multicore platforms: the size of the library, architecture issues, and performance issues. This paper identifies and addresses these issues. To enable the reuse of existing MPI programs and make message-passing programming portable and efficient, we designed a light-weight MPI-like message-passing library with a three-layer modular design, where the top two layers are mostly platform-independent, and the bottom layer enables platform-specific optimizations. This approach has allowed us to effectively support message-passing on several popular embedded multicore signal-processing platforms, including the IBM CELL and the ITRI PAC Duo. Our results show that message-passing programming is a viable solution for multicore signal processing applications and may be considered by platform vendors.     

Application of nonlinear design optimization for power convertercomponents

A computer-aided-design approach for power converter components is described. A designer with a minimum of programming and optimization experience can interface with nonlinear optimization routines to rapidly perform design trade-offs that would be impossible by hand. A power converter design using MOSFET and bipolar-junction-transistor (BJT) switches is shown to illustrate the power of optimization routines in power electronics. Realistic design values and available vendor components can be incorporated in a design without using an extensive database program structure. A practical example is given with experimental data to verify the accuracy and usefulness of optimization software     

Java implementation of policy‐based bandwidth management

We describe a Java implementation of a policy based bandwidth management system using the standard policy protocols and an interface to the Linux Diffserv implementation. The useful features, such as extensibility and object orientation, of the Java implementation is illustrated by directly referring to the relevant programming codes. Through two practical experiments, we demonstrate the capability of our implementation in supporting policy‐based dynamic resource allocations in enterprise networks. Copyright © 2003 John Wiley &Sons, Ltd.     

10位4路串行数模转换器MAX5741原理及其与DSP的SPI接口应用

本文分析了MAXIM公司的10位4路串行数模转换器(DAC)MAX5741的功能,特点,工作原理,操作指令及其与TMS320LF2407的硬件SPI接口及软件编程.提供了一个新颖,方便的模数转换系统.     

Java Parallel Implementations of Kohonen Self-Organizing Feature Maps

The self-organizing map (SOM) is an unsupervised learning neural network. The goal of this network is to produce a similarity graph of input data. It is a two-dimensional mesh of neurons each with a weight vector. Generally, the network organizes the nodes in the grid into local neighborhoods and the learning process acts as feature classifiers on the input data. The feature map is formed automatically through a cyclic process by comparing input patterns to vectors at each node. No training …     

MPI及其Java实现

随着科学技术的发展，对计算机的并行计算技术的要求越来越高。消息传递接口MPI提供了一种很好的方法。MPI API可以高效地在异构环境中使用，并可以在众多厂商的平台上实现，底层的通信和系统不会有大的改变。java语言是伴随着网络计算技术而诞生的编程语言，它对网络有较好的支持，在网络计算技术中，有着举足轻重的地位。许多分布式应用程序都是由Java开发的。开发一个Java版的MPI很有必要。但MPI论坛未定义MPI的java接口，本文从MPI的基本概念入手，说明了如何用java语言实现MPI。     

Distributed network computing over local ATM networks

Communication between processors has long been the bottleneck of distributed network computing. However, recent progress in switch-based high-speed local area networks (LANs) may be changing this situation. Asynchronous transfer mode (ATM) is one of the most widely-accepted and emerging high-speed network standards which can potentially satisfy the communication needs of distributed network computing. We investigate distributed network computing over local ATM networks. We first study the performance characteristics involving end-to-end communication in an environment that includes several types of workstations interconnected via a Fore Systems' ASX-100 ATM switch. We then compare the communication performance of four different application programming interfaces (APIs). The four APIs were Fore Systems' ATM API, the BSD socket programming interface, Sun's remote procedure call (RPC), and the parallel virtual machine (PVM) message passing library. Each API represents distributed programming at a different communication protocol layer. We evaluated two popular distributed applications, parallel matrix multiplication and parallel partial differential equations, over the local ATM network. The experimental results show that network computing is promising over local ATM networks, provided that the higher level protocols, device drivers, and network interfaces are improved