Digital Commons Network^™

Comparison Of Different Methods For Estimating Cardiac Timings: A Comprehensive Multimodal Echocardiography Investigation, Parastoo Dehkordi, Farad Khosrow-Khavar, Marco Di Rienzo, Omer T. Inan, Samuel E. Schmidt, Andrew P. Blaber, Kasper Sorensen, Johannes J. Struijk, Vahid Zakeri, Prospero Lombardi, Md. Mobaskir H. Shandhi, Mojtaba Borairi, John M. Zanetti, Kouhyar Tavakolian

Biomedical Sciences Faculty Publications

Cardiac time intervals are important hemodynamic indices and provide information about left ventricular performance. Phonocardiography (PCG), impedance cardiography (ICG), and recently, seismocardiography (SCG) have been unobtrusive methods of choice for detection of cardiac time intervals and have potentials to be integrated into wearable devices. The main purpose of this study was to investigate the accuracy and precision of beat-to-beat extraction of cardiac timings from the PCG, ICG and SCG recordings in comparison to multimodal echocardiography (Doppler, TDI, and M-mode) as the gold clinical standard. Recordings were obtained from 86 healthy adults and in total 2,120 cardiac cycles were analyzed. For …

Volume 57, Number 2: August 21, 2019, University Of North Dakota

University Letter Archive

No abstract provided.

A Comparison Of Drone Imagery And Ground-Based Methods For Estimating The Extent Of Habitat Destruction By Lesser Snow Geese (Anser Caerulescens Caerulescens) In La Pérouse Bay, Andrew Barnas, Brian J. Darby, Gregory S. Vandeberg, Robert F. Rockwell, Susan N. Ellis-Felege

Biology Faculty Publications

Lesser snow goose (Anser caerulescens caerulescens) populations have dramatically altered vegetation communities through increased foraging pressure. In remote regions, regular habitat assessments are logistically challenging and time consuming. Drones are increasingly being used by ecologists to conduct habitat assessments, but reliance on georeferenced data as ground truth may not always be feasible. We estimated goose habitat degradation using photointerpretation of drone imagery and compared estimates to those made with ground-based linear transects. In July 2016, we surveyed five study plots in La Pérouse Bay, Manitoba, to evaluate the effectiveness of a fixed-wing drone with simple Red Green Blue …

A Comparison Of Drone Imagery And Groundbased Methods For Estimating The Extent Of Habitat Destruction By Lesser Snow Geese (Anser Caerulescens Caerulescens) In La Pérouse Bay, Andrew F. Barnas, Brian J. Darby, Gregory S. Vandeberg, Robert F. Rockwell, Susan N. Ellis-Felege

Biology Faculty Publications

Lesser snow goose (Anser caerulescens caerulescens) populations have dramatically altered vegetation communities through increased foraging pressure. In remote regions, regular habitat assessments are logistically challenging and time consuming. Drones are increasingly being used by ecologists to conduct habitat assessments, but reliance on georeferenced data as ground truth may not always be feasible. We estimated goose habitat degradation using photointerpretation of drone imagery and compared estimates to those made with ground-based linear transects. In July 2016, we surveyed five study plots in La Pérouse Bay, Manitoba, to evaluate the effectiveness of a fixed-wing drone with simple Red Green Blue …

Volume 56, Number 51: August 07, 2019, University Of North Dakota

University Letter Archive

No abstract provided.

Summer Commencement: August 2, 2019, University Of North Dakota

UND Commencement Programs

UND Summer Commencement program from August 2, 2019.

Und Today: August 2019, University Of North Dakota

UND Today Archive

No abstract provided.

Improving Student Attitudes Toward Discussion Boards Using A Brief Motivational Intervention, Virginia Clinton, Alison E. Kelly

Education, Health & Behavior Studies Faculty Publications

Discussion boards are tools to afford student interaction and engagement in online courses, but students often have negative attitudes toward discussion boards. The purpose of this study was to determine whether an intervention informing students of the usefulness of online discussion boards affected their attitudes toward discussion boards. The instructor randomly assigned students (N = 65) to view a video and answer an essay question on either the benefits of discussion boards (treatment) or how discussion boards were graded (control). Students in the treatment condition indicated discussion boards as being more useful than did students in the control condition, p …

Volume 56, Number 49: July 24, 2019, University Of North Dakota

University Letter Archive

No abstract provided.

Modification Of Vertical Earth Pressure Formulas For High Fill Cut-And-Cover Tunnels Experimental And Numerical Methods, Sheng Li, Li Ma, I-Hsuan Ho, Qicai Wang, Bentian Yu, Peng Zhou

Geology and Geological Engineering Faculty Publications

Te high-flled cut-and-cover tunnel (HFCCT) is a solution to reclaim more useable lands due to the unique landforms of Loess Plateau in northwestern China. Because of the ultrahigh backfll, the estimation of vertical earth pressure will signifcantly afect the design and safety of the cut-and-cover tunnel (CCT). Te current methods for estimating the vertical earth pressure are either to overestimate or underestimate the vertical earth pressure on the top of HFCCT. To more precisely estimate the vertical earth pressure distribution, the vertical earth pressure based on the soil column pressure, �h (h: the height of backfll above the CCT), needs …

Volume 56, Number 47: July 10, 2019, University Of North Dakota

University Letter Archive

No abstract provided.

Volume 56, Number 46: July 03, 2019, University Of North Dakota

University Letter Archive

No abstract provided.

Relationship Between Ischemic Stroke And Pulse Rate Variability As A Surrogate Of Heart Rate Variability, Ajay K. Verma, Parshuram M. Aarotale, Parastoo Dehkordi, Jau-Shin Lou, Kouhyar Tavakolian

Electrical Engineering Faculty Publications

Autonomic reflex ascertains cardiovascular homeostasis during standing. Impaired autonomic reflex could lead to dizziness and falls while standing; this is prevalent in stroke survivors. Pulse rate variability (PRV) has been utilized in the literature in lieu of heart rate variability (HRV) for ambulatory and portable monitoring of autonomic reflex predominantly in young, healthy individuals. Here, we compared the PRV with gold standard HRV for monitoring autonomic reflex in ischemic stroke survivors. Continuous blood pressure and electrocardiography were acquired from ischemic stroke survivors (64 ± 1 years) and age-matched controls (65 ± 2 years) during a 10-minute sit-to-stand test. Beat-by-beat heart …

Summer 2019, University Of North Dakota Alumni Association

ALL: UND Alumni Review Master List

Summer 2019 issue of "The University of North Dakota Alumni Review." 60 pages

Volume 102, Number 2

Aerocom: Summer 2019, John D. Odegard School Of Aerospace Sciences

Aerocom: John D. Odegard School of Aerospace Sciences Alumni Magazine

No abstract provided.

Laboratory Studies Of Rich Gas Interactions With Bakken Crude Oil To Support Enhanced Oil Recovery, Steven B. Hawthorne, James A. Sorensen, David J. Miller, Charles D. Gorecki, John A. Harju, Gordon Pospisil

EERC Publications, Papers, & Presentations

Lab studies are being conducted to determine the effect of different rich gases on their potential to enhance Bakken crude oil recovery. These include measuring the MMP of Bakken crude oil with different candidate gas injectants and measuring the hydrocarbon composition in the “miscible” phase generated by crude oil/injectant exposures.

Laboratory Investigation Of Co2 Injectivity And Adsorption Potential Within The Bakken Formation, Steven A. Smith, Bethany A. Kurz, James A. Sorensen, Christopher J. Beddoe, Blaise A.F. Mibeck, Alexander Azenkeng, Steven B. Hawthorne, Charles D. Gorecki

EERC Publications, Papers, & Presentations

To assess CO₂ injectivity and storage potential within the organic-rich shales and middle member of the Bakken Formation, a series of laboratory tests were performed.

Unconventional Rock Requires Unconventional Analysis: Methods For Characterization, Shane K. Butler, Alexander Azenkeng, Blaise A.F. Mibeck, Bethany A. Kurz, Kurt E. Eylands

EERC Publications, Papers, & Presentations

Advanced image analysis techniques were applied to better understand and quantify factors that could affect CO₂ storage in the Bakken Formation, with an ultimate goal of improved method development to estimate CO₂ storage potential of unconventional reservoirs.

Und Today: July 2019, University Of North Dakota

UND Today Archive

No abstract provided.

164th Infantry News: July 2019, 164th Infantry Association

164th Infantry Regiment Publications

July 2019 edition of the 164th Infantry News. A total of 104 pages, containing news articles, event notices, photographs, and personal memories from the veterans of the 164th Infantry Regiment.

Vol. 44, No. 2: Summer 2019, School Of Medicine & Health Sciences

North Dakota Medicine Archive

No abstract provided.

Volume 56, Number 45: June 26, 2019, University Of North Dakota

University Letter Archive

No abstract provided.

Volume 56, Number 42: June 05, 2019, University Of North Dakota

University Letter Archive

No abstract provided.

Williston Basin Water Treatment Technology Test Bed, University Of North Dakota. Energy And Environmental Research Center

EERC Brochures and Fact Sheets

Fact sheet about Energy & Environmental Research Center plan to pilot-test technology to treat high-TDS (total dissolved solids) water. Includes a description of proposed water treatment technology and plan for the testing process. [This item is an outdated or superseded version and retained for historical purposes only. It may no longer reflect current information, policies, or practices.]

Und Today: June 2019, University Of North Dakota

UND Today Archive

No abstract provided.

Statistical Optimization Of Stress Level In Mg-Li-Al Alloys Upon Hot Compression Testing, Rezawana Islam, Meysem Haghshenas

Mechanical Engineering Faculty Publications

In the present study, a response optimization method using Extreme Vertices Mixer Design (EVMD) approach is proposed for stress optimization in a thermomechanically processed Mg-Li-Al alloy. Experimentation was planned as per mixed design proportions of Mg, Li and Al and process variables (i.e. temperature and strain rate). Each experiment has been performed under different conditions of factors proportions and process variables. The response, particularly stress has been considered for each experiment. The response is optimized to find an optimum condition when the contributing factors influence material characteristics in such a way, to achieve better strength, ductility and corrosion resistance. Estimated …

Comparing Likert Scale Functionality Across Culturally And Linguistically Diverse Groups In Science Education Research: An Illustration Using Qatari Students’ Responses To An Attitude Toward Science Survey, Ryan Summers, Shuai Wang, Fouad Abd-El-Khalick, Ziad Said

Teaching, Leadership & Professional Practice Faculty Publications

Surveying is a common methodology in science education research, including cross-national and cross-cultural comparisons. The literature surrounding students’ attitudes toward science, in particular, illustrates the prevalence of efforts to translate instruments with the eventual goal of comparing groups. This paper utilizes survey data from a nationally representative cross-sectional study of Qatari students in grades 3 through 12 to frame a discussion around the adequacy and extent to which common adaptations allow comparisons to be made among linguistically or culturally different respondents. The analytic sample contained 2,615 students who responded to a previously validated 32-item instrument, 1,704 of whom completed the …

A Survey On Software Cost Estimation Techniques, Sai Mohan Reddy Chirra, Hassan Reza

Computer Science Faculty Publications

The ability to accurately estimate the cost needed to complete a specific project has been a challenge over the past decades. For a successful software project, accurate prediction of the cost, time and effort is a very much essential task. This paper presents a systematic review of different models used for software cost estimation which includes algorithmic methods, non-algorithmic methods and learning-oriented methods. The models considered in this review include both the traditional and the recent approaches for software cost estimation. The main objective of this paper is to provide an overview of software cost estimation models and summarize their …

The Regulatory Control Of Cebpa Enhancers And Silencers In The Myeloid And Red-Blood Cell Lineages, Andrea Repele, Shawn Krueger, Tapas Bhattacharyya, Michelle Y. Tuineau, Manu

Biology Faculty Publications

Cebpa encodes a transcription factor (TF) that plays an instructive role in the development of multiple myeloid lineages. The expression of Cebpa itself is finely modulated, as Cebpa is expressed at high and intermediate levels in neutrophils and macrophages respectively and downregulated in non-myeloid lineages. The cis-regulatory logic underlying the lineage-specific modulation of Cebpa’s expression level is yet to be fully characterized. Previously, we had identified 6 new cis-regulatory modules (CRMs) in a 78kb region surrounding Cebpa. We had also inferred the TFs that regulate each CRM by fitting a sequence-based thermodynamic model to a comprehensive …

Volume 56, Number 41: May 29, 2019, University Of North Dakota

University Letter Archive

No abstract provided.