Developing numerical libraries in Java

The rapid and widespread adoption of Java has created a demand for reliable and reusable mathematical software components to support the growing number of compute-intensive applications now under development, particularly in science and engineering. In this paper we address practical issues of the Java language and environment which have an effect on numerical library design and development. Benchmarks which illustrate the current levels of performance of key numerical kernels on a variety of Java platforms are presented. Finally, a strategy for the development of a fundamental numerical toolkit for Java is proposed and its current status is described.Comment: 11 pages. Revised version of paper presented to the 1998 ACM Conference on Java for High Performance Network Computing. To appear in Concurrency: Practice and Experienc

Research and Design of a Routing Protocol in Large-Scale Wireless Sensor Networks

无线传感器网络，作为全球未来十大技术之一，集成了传感器技术、嵌入式计算技术、分布式信息处理和自组织网技术，可实时感知、采集、处理、传输网络分布区域内的各种信息数据，在军事国防、生物医疗、环境监测、抢险救灾、防恐反恐、危险区域远程控制等领域具有十分广阔的应用前景。 本文研究分析了无线传感器网络的已有路由协议，并针对大规模的无线传感器网络设计了一种树状路由协议，它根据节点地址信息来形成路由，从而简化了复杂繁冗的路由表查找和维护，节省了不必要的开销，提高了路由效率，实现了快速有效的数据传输。 为支持此路由协议本文提出了一种自适应动态地址分配算——ADAR（AdaptiveDynamicAddre...As one of the ten high technologies in the future, wireless sensor network, which is the integration of micro-sensors, embedded computing, modern network and Ad Hoc technologies, can apperceive, collect, process and transmit various information data within the region. It can be used in military defense, biomedical, environmental monitoring, disaster relief, counter-terrorism, remote control of haz...学位：工学硕士院系专业：信息科学与技术学院通信工程系_通信与信息系统学号：2332007115216

ELLPACK Distribution Guide

This note describes general installation procedures for the ELLPACK 77 system. This set of programs is the software product of the ELLPACK project [2] to develop a research and educational tool to evaluate software for solving elliptic partial differential equations. SYSTEM OVERVIEW ELLPACK 77 allows its users to pose a linear elliptic partial differential equation with general boundary conditions on a rectangular domain in two or three dimensions and to specify the names of procedures to be used to solve the problem. This ELLPACK input is coded in a simple, high-level problem-oriented language which is recognized by the ELLPACK Preprocessor. This preprocessor, a FORTRAN program, accepts this input and generates another FORTRAN program, the ELLPACK control program, which performs the requested tasks by specifying calls to FORTRAN subprograms in a library of programs called the ELLPACK modules. When the generated control program executes, then, it solves the problem specified in the original input using the methods described and produces the output requested. Information on preparing input for FLLPACK 77 is found in [3] and details on adding modules is contained in [4], It is assumed that the reader is familiar with both these documents in what follows. The system described here was developed on the CDC6500 computing system at Purdue University with modules contributed from a number of sources. Various versions of ELLPACK have since run on a number of different computing system