Tell Me A Story

https://digitalcommons.library.umaine.edu/mmb-vp/6456/thumbnail.jp

Extending the Energy Framework for Network Simulator 3 (ns-3)

The problem of designing and simulating optimal transmission protocols for energy harvesting wireless networks has recently received considerable attention, thus requiring for an accurate modeling of the energy harvesting process and a consequent redesign of the simulation framework to include it. While the current ns-3 energy framework allows the definition of new energy sources that incorporate the contribution of an energy harvester, the integration of an energy harvester component into an existing energy source is not straightforward using the existing energy framework. In this poster, we propose an extension of the energy framework currently released with ns-3 in order to explicitly introduce the concept of an energy harvester. Starting from the definition of the general interface, we then provide the implementation of two simple models for the energy harvester. In addition, we extend the set of implementations of the current energy framework to include a model for a supercapacitor energy source and a device energy model for the energy consumption of a sensor. Finally, we introduce the concept of an energy predictor, that gathers information from the energy source and harvester and use this information to predict the amount of energy that will be available in the future, and we provide an example implementation. As a result of these efforts, we believe that our contributions to the ns-3 energy framework will provide a useful tool to enhance the quality of simulations of energy-aware wireless networks.Comment: 2 pages, 4 figures. Poster presented at WNS3 2014, Atlanta, G

Upregulation of Hypoxia-Inducible Genes in Endothelial Cells to Create Artificial Vasculature

This study explored the possibility that upregulation of Hypoxia Inducible Factor-1 (Hif-1)-responsive genes in Human Umbilical Vein Endothelial Cells (HUVEC) would promote and stabilize HUVEC formation into inchoate vascular beds within artificial collagen gels. This experiment was designed to explore the above possibility by sub-cloning Hif-1α, the related chimeric construct Hif-1α/VP16, and the marker gene dsRed into retroviral expression vectors, producing retroviral vectors containing these genes, and stably transducing HUVEC using these retroviruses. Transduced HUVEC were to be observed in cell culture as well as after implantation into artificial collagen gels that have previously supported vascular bed formation by HUVEC. Our results show, preliminarily, that HUVEC transduced with Hif-1α/VP16 go into cell-cycle arrest. Attempts to transduce HUVEC with Hif-1α failed to achieve high enough transduction efficiency to determine the cells angiogenic potential. This study concluded that more experiments need to be conducted to better characterize the effects of hypoxia-responsive gene upregulation in controlling HUVEC angiogenesis and cell-cycle signaling and that straightforward transduction of HUVEC by Hif-1α/VP16 is probably not sufficient, in itself, to induce in vitro vascular bed formation

Oral Interview of Susan Bradford by Marli Werner and Mazie Hough for the Feminist Oral History Project (Part #3)

Part of a series of interviews conducted for the Feminist Oral History Project during 2001 by Ann Schonberger concerning the history of Spruce Run.https://digitalcommons.library.umaine.edu/maine_women_audio/1027/thumbnail.jp

THE RESOURCES MANAGEMENT MOVEMENT (The Coming Death of Production Management Education)

Production management, taught in nearly all colleges of business administration, is not a popular course. One reason it is not popular is that it does not relate to the typical young student\u27s life experiences. This typical student has for 18 years or more been a social animal, and thus he can relate to college courses in the sociopsychological realm. The rare student who has considerable work experience is the only one likely to appreciate and perhaps even enjoy a course in production management (or operations management, as it is called in some schools). But this kind of problem is found in many fields: engineering, the physical sciences, foreign languages, etc. The instructor in such areas tends to shrug his shoulders and occasionally express the forlorn wish that more students would go to work for a few years before entering college

Oral Interview of Marian Allen by Ann Schonberger and Peggy Danielson for the Feminist Oral History Project (Part #3)

Part of a series of interviews conducted for the Feminist Oral History Project during 1997 by Ann Schonberger and Peggy Danielson concerning the history of Spruce Run.https://digitalcommons.library.umaine.edu/maine_women_audio/1018/thumbnail.jp

The Floating Dungeon

The Floating Dungeon: The History of the Slave Ship. A lecture by Dr. Marcus Rediker on October 11, 2007