Spacecraft command verification: The AI solution

Recently, a knowledge-based approach was used to develop a system called the Command Constraint Checker (CCC) for TRW. CCC was created to automate the process of verifying spacecraft command sequences. To check command files by hand for timing and sequencing errors is a time-consuming and error-prone task. Conventional software solutions were rejected when it was estimated that it would require 36 man-months to build an automated tool to check constraints by conventional methods. Using rule-based representation to model the various timing and sequencing constraints of the spacecraft, CCC was developed and tested in only three months. By applying artificial intelligence techniques, CCC designers were able to demonstrate the viability of AI as a tool to transform difficult problems into easily managed tasks. The design considerations used in developing CCC are discussed and the potential impact of this system on future satellite programs is examined

Networked Families

Presents survey results on the use of the Internet and ownership of cell phones and computers, by household type. Examines how technology ownership affects the frequency, form, purpose, and quality of communications among family members and friends

Connecting Inquiry, Research, and Technology: The Multigenre Digital Inquiry Project

This article describes research on a Multigenre Digital Inquiry Project (MDIP), a technology-infused project designed to provide an opportunity for students to inquire about a topic of interest and share their research using 21st century technologies. Instead of composing a research paper or literature review, students designed a website with pieces written in multiple genres to share their learning, including at least two pieces created using digital tools. In this article, the authors share the design of the MDIP and how it was implemented in three teacher education courses. Data analysis aimed to understand how pre-service teachers engaged in this project and reflected on their learning. Using themes from the analysis of students’ end-of-semester reflections and memos written about the pieces included in the projects, the authors share how students valued support in various areas including technology, how they expanded their views of writing and genre, and how their experiences illustrated academic, personal, and pedagogical growth. Ultimately, students learned from this challenging, yet rewarding experience. Finally, the authors share suggestions for others interested in incorporating a MDIP in their work

Adults’ Readiness to Learn and Skill Acquisition and Use: An Analysis of PIAAC

This study examined the relationship between adults’ readiness to learn (RtL) and skill acquisition and use in the US sample of the PIAAC. RtL showed significant effects on each of the observed skill use outcomes. It was the strongest predictor of reading and writing skill use at home

Evaluating the Written Work of Others: One Way Economics Students Can Learn to Write

The authors present a series of writing assignments that teaches students how to evaluate and critique the written economic work of others. The foundation text is McCloskey’s (2000) Economical Writing. The students’ dialogues with McCloskey, with each other, and with the authors of the pieces they evaluate sharpen their understanding of, and ability to use, language as an instrument of economic thought. Interviews with former students identify specific benefits from the student perspective of this approach. The authors show how the assignment series can be modified in several ways and how the general approach, as well as the foundation text, can be used in different economics courses

Terms of Engagement: Adults’ Experience in Higher Education

National Survey of Student Engagement (NSSE) data were re-analyzed to look for differences between traditional and nontraditional-age students. Surprisingly, no significant differences were found for five NSSE Benchmarks, including Supportive Campus Environment. Differences were found in subsequent analysis of two scales of academic engagement identified through follow-up factor analysi

Dietary Transfer of Heavy Metals in Manatees

In recent decades, manatees and dugongs globally have exhibited potentially detrimental levels of a variety of heavy metals in their body tissues. The threatened Florida manatee (Trichechus manatus latirostris), which is a subspecies of the West Indian manatee (Trichechus manatus), has shown corresponding high levels of heavy metals in their blood, skin, liver, and kidneys. As obligate herbivores, these animals rely heavily upon seagrasses as a major component of their diet. Globally, seagrasses at low latitudes have high levels of heavy metals in their tissues. Detrimental levels of heavy metals in Sirenians have not been established until now. This study is assessing the heavy metal concentrations of seagrasses in South Florida as a major dietary contributor to manatees, and investigating possible sources of these metals