A GIS-based toolkit for route choice analysis

This paper develops and applies the route choice analysis (RCA) toolkit. This GIS-based toolkit generates a suite of over 40 variables describing route characteristics such as distance, travel time, speed statistics, number of intersections, number of turns, number of stop signs/stop lights, and a measure of route circuity, to name a few. The input to the toolkit is one or more routes, which can be obtained from global positioning system (GPS) data or some other means (e.g., shortest path). While the toolkit is designed to support route choice modeling by generating variables that have been tested in previous modeling efforts, we demonstrate its utility by testing the hypothesis that workers choose routes to minimize either travel time or distance between home and work. A GPS-enhanced data set of 237 observed routes for home-to-work trips collected for auto drivers in Halifax, Nova Scotia, Canada is used in our analysis. We find that the null hypothesis is refuted - that is, a comparison of observed routes to their shortest-path alternatives based on time and distance via inferential statistics indicates that observed routes are significantly longer compared to their alternatives. This finding suggests that workers may choose routes based on other route attributes. The attributes generated by the RCA toolkit for observed, shortest time, and shortest distance routes are compared and significant differences are noted.     

XView工具箱编程技术

本文介绍了X Window软件包提供的XView工具箱,阐明了其运行机制,并介绍了如何编写和运行Xview应用程序。     

基于Pro/E的双螺杆挤出机挤压系统三维参数化设计

将参数化设计技术应用于双螺杆挤出机挤压系统的设计。文章介绍了以Pro/Engineer为平台,利用Visual C++6.0和Pro/Engineer应用程序接口Pro/Toolkit,开发了双螺杆挤出机挤压系统的三维参数化设计软件。     

Uncovering the value of planning in new venture creation: A process and contingency perspective

Researchers are engaged in a major debate on the value of business planning in new venture creation. This study suggests a potential resolution by applying a process and contingency perspective. The results indicate that planning is beneficial, yet planning processes need to be governed by different planning regimes depending on the type of founding environment. In highly dynamic environments, entrepreneurs will get most value from planning when they focus on select planning activities, and speed up the planning task. In less dynamic environments, they are better of pursuing a munificent approach to planning. The analysis thus reveals a major component of theorization on business planning that has been neglected in previous discussions. As for entrepreneurship teaching and practice, the findings suggest the importance of an adaptive, “toolkit” approach to business planning. Hypotheses were developed based on information-processing and decision-making theory and were tested with an ordered probit analysis on a sample of 100 start-ups backed by venture capital.