Publications

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    ( 2024)
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    A Low Cost Virtual Reality Human Computer Interface for CAD Model Manipulation
    (http://www.edgj.org/index.php/EDGJ/article/view/40, 2005) Seth, Abhishek ; Smith, Shana ; Shelley, Mack ; Jiang, Qi ; Political Science
    Interactions with high volume complex three-dimensional data using traditional two-dimensional computer interfaces have, historically, been inefficient and restrictive. However, during the past decade, virtual reality (VR) has presented a new paradigm for human-computer interaction. This paper presents a VR human-computer interface system, which aims at providing a solution to the human-computer interaction problems present in today’s computer-aided design (CAD) software applications. A data glove device is used as a 3D interface for CAD model manipulation in a virtual design space. To make the visualization more realistic, real-time active stereo vision is provided using LCD shutter glasses. To determine the ease of use and intuitiveness of the interface, a human subject study was conducted for performing standard CAD manipulation tasks. Analysis results and technical issues are also presented and discussed.
  • Publication
    Comparing three measures of depressive symptoms among American Indian adolescents
    (Centers for American Indian and Alaska Native Health, 2004) Thrane, Lisa ; Whitbeck, Les ; Hoyt, Danny ; Shelley, Mack ; Political Science
    This study examined the measurement of depressive symptoms among American Indian adolescents as assessed by the Center for Epidemiologic Studies Depression Scale (CES-D), Youth Self Report (YSR), and the Tri-Ethnic Center's for Prevention Research Depression Scale (TEDS). This analysis demonstrated that the TEDS had good internal consistency, demonstrated construct validity, and shared a commonality with the other two measures, but had limited predictive validity. The YSR had strong predictive validity but, like the CES-D, showed weakness in construct validity. Unexpectedly, the CES-D and YSR revealed enculturated youth were at risk of depressive symptoms. These findings do not generate unequivocal support for any one measure, but suggest that their strengths and potential shortcomings should be taken into account when assessing depressive symptoms among American Indian youth.
  • Publication
    Relationship among Risk Factors for Nephrolithiasis, Cardiovascular Disease, and Ethnicity: Focus on a Law Enforcement Cohort
    (© Copyright 2022 Elsevier B.V, 2004-03) Ramey, Sandra ; Franke, Warren ; Shelley, Mack ; Kinesiology ; Statistics ; Political Science
    This cross-sectional study determined the prevalence of nephrolithiasis and common cardiovascular disease (CVD) risk factors in a law enforcement officer (LEO) cohort and evaluated the relationship of nephrolithiasis with several CVD risk factors, including the possible effect of ethnicity. Self reported nephrolithiasis and CVD risk factors among currently employed male LEOs from nine states (n = 2,818) were compared to other men in the same states (n = 9,650). Of the LEOs, 6.2% (n = 174) self reported at least one kidney stone (range = 1 to 12, mean 2.3 6 2.1 stones). Twenty five percent of Native American LEOs (n = 7 of 28) self reported a history of stones. In LEOs with a history of nephrolithiasis, overweight defined as body mass index. 25 kg/m2 (odds ratio [OR] = 1.80, 95% confidence interval [CI] = 1.04, 3.11), hypercholesterolemia (OR = 1.53, 95% CI = 1.09, 2.15), and hypertension (OR = 1.46, 95% CI = 1.02, 2.11) were associated with the disease. These results suggest officers with common CVD risk factors are also at an increased risk for nephrolithiasis. Native American LEOs have a disproportionately higher prevalence of nephrolithiasis than do other ethnic groups. © 2004 American Association of Occupational Health Nurses.