JavaStatSoft: design patterns and features

JavaStatSoft, implemented using Java, is an open-source software for performing statistics. The current features of JavaStatSoft are described. Several well-known patterns the software used are introduced. In addition, based on these patterns and the experience in developing the software, a new framework, referred to as Data Analysis Module, is proposed to help programmers develop a user-friendly software for data analysis.     

基于Web技术的网络拓扑图生成方法的研究

综合采用提取路由表和地址转发表的方法，对网络逻辑拓扑结构和物理拓扑结构进行自动探索，提出了用于优化显示网络拓扑图的一种显示算法，采用Java技术实现了基于Web的网络拓扑图，并对在实现过程中遇到的问题进行了探讨。试验结果表明，由此生成的网络拓扑图准确、美观、能够实现跨平台和跨区域的管理。     

KamiWaAI – interactive 3D sketching with Java based on Cl(4, 1) conformal model of Euclidean space

This paper introduces the new interactive Java sketching software KamiWaAi, recently developed at the University of Fukui. Its graphical user interface enables the user without any knowledge of both mathematics or computer science, to do full three dimensional “drawings” on the screen. The resulting constructions can be reshaped interactively by dragging its points over the screen. The programming approach is new. KamiWaAi implements geometric objects like points, lines, circles, spheres, etc. directly as software objects (Java classes) of the same name. These software objects are geometric entities mathematically defined and manipulated in a conformal geometric algebra, combining the five dimensions of origin, three space and infinity. Simple geometric products in this algebra represent geometric unions, intersections, arbitrary rotations and translations, projections, distance, etc. To ease the coordinate free and matrix free implementation of this fundamental geometric product, a new algebraic three level approach is presented. Finally details about the Java classes of the new GeometricAlgebra software package and their associated methods are given. KamiWaAi is available for free internet download.     

A Java-based control system for the Orsay tandem accelerator

A new control system was designed for the tandem MP-9 at Orsay. Because of the existing devices located on high voltage platforms and the lack of space inside the accelerator, in-house electronic cards based on micro-controllers and an optical fieldbus were developed to collect data. VME processors under VxWorks, a real time operating system, manage the fieldbus, concentrate the accelerator information and transmit it to the supervisory software through the ethernet network. This software consists of a collection of Java virtual machines (JVM) running on several Unix work-stations and PCs under Windows. Some of the Java virtual machines manage apparatus, instruments, local display and connections to an object database and VME concentrators. Other manage general synoptics. JVMs communicate between themselves with RMI protocol and JRPC with VME concentrators. So the supervisory software can be spread over several control stations throughout the network.     

远程控制在大功率固体激光加工系统中的应用

针对目前大功率固体激光加工系统的特点,结合相关产品使用的网络构架,研制开发了一套基于Internet的远程监控系统。它是一种将网络技术与系统监控相结合,在异地通过Internet实时监控系统的运行状态,并为系统的故障诊断提供依据的技术。该系统具有高效性、准确性和实时性等特点。在设计方面采用了先进的软件构架,可以实时监控激光加工系统的操作情况和参数状态;查询激光加工系统的当前数据和历史数据,并对开放权限的数据进行修改;通过和用户在线沟通完成疑难问题的解答。     

On-line pseudo-dynamic network testing on base-isolated bridges using Internet and wireless Internet

In this paper we present the results of the online pseudo-dynamic network testing using the Internet that were jointly conducted by several institutions in Korea and Japan. Example studies were performed on base-isolated bridges with four continous spans. Test facilities located at several institutions were interactively used to test the non-linear behaviors of the base isolators. At first, a series of international network tests was carried out between Japan and Korea, and the performance of two system configurations with different data communication schemes was compared. Then, network tests were repeated on a similar bridge structure between two institutions in Korea, and the overall performance was discussed. A web-based Java monitoring system was developed for checking the partners' testing conditions and for sharing the test results with the authorized observers. Wireless Internet technology using mobile phones was also investigated. The results indicate that the time to execute a single step varies widely, depending on the data communication/sharing schemes and the testing hardware, e.g., 0.2–15 s for data communication and 1–10 s for execution of the pseudo-dynamic tests for each time-step. The time required additionally for data communication in the on-line network testing is judged as reasonable in comparison with the time for the pseudo-dynamic test. The results also show that the wireless communication is very attractive for on-line network testing, owing to the mobility and Internet security.     

The Language of Graphics

Abstract

We describe a system, called the Graphics Production Library (GPL), that implements a language for quantitative graphics. The structure of this system differs from existing statistical graphics, visualization, and mapping systems. Instead of treating a graphics display as a viewer for underlying data, GPL treats data as an accessory to viewing a graph. GPL is based on the mathematical definition of the graph of a function and uses that definition to organize data linked to the graph.     

JavaStat: a Java/R-based statistical computing environment

Architectures are described which allow a Java-based front-end to run R code on a server. The front-end described here is a Java application called JavaStat (). JavaStat is a highly-interactive program for data analysis and dynamic visualization with data management capabilities. The objective is to bring the high-level functions of R to JavaStat, without excessive duplicative development work. Results returned from R are wrapped and then displayed using linked, dynamic plots in JavaStat. The principal idea is to use Remote Method Invocation to communicate with a Java server program (JRIServer), which in turn communicates with R using Java/R Interface (JRI). Two versions have been implemented. The first (basic) architecture maintains a connection between the client and server in order to return the results from R. This is suitable for small to moderate data sets in which relatively simple models are run. The second (enhanced) architecture queues the requests and uses polling to fetch the results. It is suitable for large data sets and complex models, e.g., those encountered in genomic studies. JavaStat supports the basic architecture out of the box, but a user account is required to enable the enhanced architectures. The enhanced architecture supports workflows, e.g., genomic and modeling workflows.     

Mie theory 1908, on the mobile phone 2008

Hundred years ago Gustav Mie published his famous paper on the theory of light scattering by spherical particles. It has been programmed in many programming languages since invention of the computer. Nowadays with the mobile phone becoming an educational tool it would be of interest to port a Mie scattering application to a Java enabled hand set. The objective of this paper is to investigate the feasibility of porting existing Mie software to a hand held device. We will show that the mobile phone can be an advanced programming environment for the Mie theory and we will present some exemplary computational results.