Open Access. Powered by Scholars. Published by Universities.®

Physical Sciences and Mathematics Commons

Open Access. Powered by Scholars. Published by Universities.®

SelectedWorks

Discipline
Keyword
Publication Year
Publication
File Type

Articles 1 - 30 of 1943

Full-Text Articles in Physical Sciences and Mathematics

Inventing Around Edison’S Lamp Patent: The Role Of Patents In Stimulating Downstream Development And Competition, Ron D. Katznelson, John Howells Feb 2018

Inventing Around Edison’S Lamp Patent: The Role Of Patents In Stimulating Downstream Development And Competition, Ron D. Katznelson, John Howells

Ron D. Katznelson

We provide the first detailed empirical study of inventing around patent claims. The enforcement of Edison’s incandescent lamp patent in 1891-1894 stimulated a surge of patenting. Most of these later patents disclosed inventions around the Edison patent. Some of these patents introduced important new technology in their own right and became prior art for new fields, indicating that invention around patents contributes to dynamic efficiency. Contrary to widespread contemporary understanding, the Edison lamp patent did not suppress technological advance in electric lighting. The market position of General Electric (“GE”), the Edison patent-owner, weakened through the period of this patent ...


C.V. - Wojciech Budzianowski, Wojciech M. Budzianowski Jan 2017

C.V. - Wojciech Budzianowski, Wojciech M. Budzianowski

Wojciech Budzianowski

-


Renewable Energy And Sustainable Development (Resd) Group, Wojciech M. Budzianowski Jan 2017

Renewable Energy And Sustainable Development (Resd) Group, Wojciech M. Budzianowski

Wojciech Budzianowski

No abstract provided.


Mdc-R-Code 2016 Update, Joseph M. Hilbe Sep 2016

Mdc-R-Code 2016 Update, Joseph M. Hilbe

Joseph M Hilbe

Modeling Count Data: R code for download and use. Most recent update


Addition To Pglr Chap 6, Joseph M. Hilbe Aug 2016

Addition To Pglr Chap 6, Joseph M. Hilbe

Joseph M Hilbe

Addition to Chapter 6 in Practical Guide to Logistic Regression. Added section on Bayesian logistic regression using Stata.


Testing Homogeneity In Semiparametric Mixture Case-Control Models, C Z. Di, G Kc Chan, C Zheng, Ky Liang Jun 2016

Testing Homogeneity In Semiparametric Mixture Case-Control Models, C Z. Di, G Kc Chan, C Zheng, Ky Liang

Chongzhi Di

Recently, Qin and Liang (Biometrics, 2011) considered a semiparametric mixture case-control model and proposed a score test for homogeneity. The mixture model is semiparametric in the sense that the density ratio of two distributions is assumed to be of exponential form, while the baseline density is unspecified. In a family of parametric admixture models, Di and Liang (Biometrics, 2011) showed that the likelihood ratio test statistics, which is equivalent to a supremum statistics, could improve power over score tests. We generalize the likelihood ratio or supremum statistics to the semiparametric mixture model and demonstrate the power gain over the score ...


Hilbe-Pglr-Errata-And-Comments, Joseph M. Hilbe Mar 2016

Hilbe-Pglr-Errata-And-Comments, Joseph M. Hilbe

Joseph M Hilbe

Errata and Comments for Practical Guide to Logistic Regression


Procesy Cieplne I Aparaty (Lab), Wojciech M. Budzianowski Jan 2016

Procesy Cieplne I Aparaty (Lab), Wojciech M. Budzianowski

Wojciech Budzianowski

-


Online Variational Bayes Inference For High-Dimensional Correlated Data, Sylvie T. Kabisa, Jeffrey S. Morris, David Dunson Jan 2016

Online Variational Bayes Inference For High-Dimensional Correlated Data, Sylvie T. Kabisa, Jeffrey S. Morris, David Dunson

Jeffrey S. Morris

High-dimensional data with hundreds of thousands of observations are becoming commonplace in many disciplines. The analysis of such data poses many computational challenges, especially when the observations are correlated over time and/or across space. In this paper we propose exible hierarchical regression models for analyzing such data that accommodate serial and/or spatial correlation. We address the computational challenges involved in fitting these models by adopting an approximate inference framework. We develop an online variational Bayes algorithm that works by incrementally reading the data into memory one portion at a time. The performance of the method is assessed through ...


Functional Car Models For Spatially Correlated Functional Datasets, Lin Zhang, Veerabhadran Baladandayuthapani, Hongxiao Zhu, Keith A. Baggerly, Tadeusz Majewski, Bogdan Czerniak, Jeffrey S. Morris Jan 2016

Functional Car Models For Spatially Correlated Functional Datasets, Lin Zhang, Veerabhadran Baladandayuthapani, Hongxiao Zhu, Keith A. Baggerly, Tadeusz Majewski, Bogdan Czerniak, Jeffrey S. Morris

Jeffrey S. Morris

We develop a functional conditional autoregressive (CAR) model for spatially correlated data for which functions are collected on areal units of a lattice. Our model performs functional response regression while accounting for spatial correlations with potentially nonseparable and nonstationary covariance structure, in both the space and functional domains. We show theoretically that our construction leads to a CAR model at each functional location, with spatial covariance parameters varying and borrowing strength across the functional domain. Using basis transformation strategies, the nonseparable spatial-functional model is computationally scalable to enormous functional datasets, generalizable to different basis functions, and can be used on ...


Hypothesis Testing For Functional Linear Models, Y-R Su, Cz Di, L Hsu Jan 2016

Hypothesis Testing For Functional Linear Models, Y-R Su, Cz Di, L Hsu

Chongzhi Di

Functional data arise frequently in many biomedical studies, where it is often of interest to investigate the dynamic association between functional predictors and a scalar response variable. While functional linear models (FLM) are widely used to address these questions, hypothesis testing for the functional association in the FLM framework remains challenging. A popular approach to testing the functional effects is through dimension reduction by functional principal component (PC) analysis. However, its power performance depends on the choice of the number of PCs, and is not systematically studied. In this paper, we first investigate the power performance of the Wald-type test ...


Inżynieria Chemiczna Lab., Wojciech M. Budzianowski Jan 2016

Inżynieria Chemiczna Lab., Wojciech M. Budzianowski

Wojciech Budzianowski

-


Ramping Down Chinese Commercial Cyber Espionage, Emilio Iasiello Dec 2015

Ramping Down Chinese Commercial Cyber Espionage, Emilio Iasiello

Emilio Iasiello

While detractors believe that commercial cyber espionage hasn’t really stopped, recent Chinese efforts show a government trying to get a handle on its large spying apparatus that could include hired and independent contractors acting autonomously in addition to its other resources. While complete cessation may never occur, significant timely reduction demonstrates Beijing’s willingness to work with the United States as a partner and not a pariah, and provides a foundation from which the two governments can move forward on other cyber security areas where incongruity persists.


Quasi-Platonic Psl2(Q)-Actions On Closed Riemann Surfaces, Sean A. Broughton Dec 2015

Quasi-Platonic Psl2(Q)-Actions On Closed Riemann Surfaces, Sean A. Broughton

S. Allen Broughton

This paper is the first of two papers whose combined goal is to explore the dessins d'enfant and symmetries of quasi-platonic actions of PSL2(q). A quasi-platonic action of a group G on a closed Riemann S surface is a conformal action for which S/G is a sphere and S->S/G is branched over {0, 1,infinity}. The unit interval in S/G may be lifted to a dessin d'enfant D, an embedded bipartite graph in S. The dessin forms the edges and vertices of a tiling on S by dihedrally symmetric polygons, generalizing the ...


Determination Of The Global Heat Transfer Coefficient Of A Double Heat Exchanger Battery In A Dry Mode., B. Dieng, G. Jaw, A. Kane, I. Diagne, M. Dieng, G. Sissoko Dec 2015

Determination Of The Global Heat Transfer Coefficient Of A Double Heat Exchanger Battery In A Dry Mode., B. Dieng, G. Jaw, A. Kane, I. Diagne, M. Dieng, G. Sissoko

Innovative Research Publications IRP India

The cold battery is a heat exchanger between two fluids, air (secondary fluid) and iced water (primary fluid).The cold battery is composed of two heat exchangers in series, one of which is made up of flat-plate in galvanized steel serving as a reservoir for the iced water and the other one a copper shelland-tube exchanger with aluminum cooling blades. The two heat exchangers a connected pipe of the same diameter. These pipes will permit the transit of the iced water coming from the flat-plate exchanger by gravitation towards the tubes of the second exchanger. These two heat exchangers are ...


A Scenario Of Rainfall Erosivity Index Research, D .V. Pandit1, R. K. Isaac2 Dec 2015

A Scenario Of Rainfall Erosivity Index Research, D .V. Pandit1, R. K. Isaac2

Innovative Research Publications IRP India

Rainfall erosivity index is an important index to evaluate the soil loss due to rainfall. Rainstorm plays a paramount role in surface sealing, runoff and erosion process. Research on rainfall erosivity index is important in understanding the mechanism of soil erosion processes. This paper gives a scenario on the important research work done by the scientists to evaluate the erosivity index by using various methods and approaches. The aim of this paper was also to highlight that methodology of the scientists which they have used to get the appropriate erosivity index value for their study. The quality and representativeness of ...


Digital Wayfinding: A User Study, M Ryan Hess Oct 2015

Digital Wayfinding: A User Study, M Ryan Hess

M Ryan Hess

The DePaul University Richardson Library conducted a study of an interactive, touch-based wayfinding screen in order to determine 1) what specific content needs users desire in digital wayfinding services and 2) are user content needs so broad, a more full-feature experience with access to all library web content would be preferred. The three-phase study included analysis of click analytics data, observations of user interactions and questionnaires targeting user experiences and expectations. The study builds on research at other libraries around point-of-need wayfinding signage and usability of digital information. Phase 1 involved capturing anonymous click analytics of user interactions, over a ...


Blackboard-Based Electronic Warfare System, Jeremy Straub Oct 2015

Blackboard-Based Electronic Warfare System, Jeremy Straub

Jeremy Straub

With internet-connected, SCADA and cyber-physical systems becoming the next battlefield for crime and warfare, technologies for defending and attacking these systems are growing in prevalence. For entities with significant asset collections that are prospectively vulnerable to this type of an attack, autonomous response, retaliation and attack capabilities are necessary to respond to a growing threat from numerous sectors. This paper presents a command and control technique for cyberwarfare based on the Blackboard Architecture. It discusses the utility of this approach and proposes a distributed command system that can run across multiple nodes of various types.


Embアルゴリズムの新たな応用による多重比率補定(高橋将宜), Masayoshi Takahashi Sep 2015

Embアルゴリズムの新たな応用による多重比率補定(高橋将宜), Masayoshi Takahashi

Masayoshi Takahashi

No abstract provided.


Non Parametric Trend Analysis Of Climate Change In Lower Bagmati River Basin In Northern India, M. .P Akhtar, Amrendra Kumar, Deepak Khare Sep 2015

Non Parametric Trend Analysis Of Climate Change In Lower Bagmati River Basin In Northern India, M. .P Akhtar, Amrendra Kumar, Deepak Khare

Innovative Research Publications IRP India

This study is conducted to observe the temporal variability of rainfall and temperature for 102 years (1901- 2002) in the Lower Bagmati River Basin in Northern India. Annual and monsoon rainfall time series is considered to investigate the trend using non parametric methods. Trend in 102 years span indicates reduced basin water potential in


Creep Properties Of Local Variety Of Lime (Lemun Tsami) Under Quasi-Static Loading, Dakogol F. A, Obetta, S. E, Ijabo O. .J Sep 2015

Creep Properties Of Local Variety Of Lime (Lemun Tsami) Under Quasi-Static Loading, Dakogol F. A, Obetta, S. E, Ijabo O. .J

Innovative Research Publications IRP India

Local variety of lime (Lemun tsami) was subjected to quasi-static compressive loading using Instron Universal Testing Machine at three levels of time after harvest; freshly harvested, one and two weeks after harvest. Creep parameters were determined by fitting the experimental data to the Burger’s Model and the obtained model equation for freshly harvested was: 𝑱 𝒕 = 𝟏. 𝟖𝟒𝟑 + 𝟐. 𝟓𝟗[ 1 – е (-t/2.933) ]+ 𝒕 𝟏𝟏𝟔𝟎.𝟎𝟗𝟑 , R 2 = 0.98. The instantaneous creep compliance (Jo) was; 1.843, 3.137 and 4.116 1/MPa for freshly harvested, one and two weeks after harvest respectively while the ...


An Intelligent Attitude Determination And Control System Concept For A Cubesat Class Spacecraft, Jeremy Straub Sep 2015

An Intelligent Attitude Determination And Control System Concept For A Cubesat Class Spacecraft, Jeremy Straub

Jeremy Straub

An attitude determination and control system (ADCS) is used to orient a spacecraft for a wide variety of purposes (e.g., to keep a camera facing Earth or orient the spacecraft for propulsion system use). The proposed intelligent ADCS has several key features: first, it can be used in multiple modes, spanning from passive stabilization of two axes and unconstrained spin on a third to three-axis full active stabilization. It also includes electromagnetic components to ‘dump’ spin from the reaction wheels. Second, the ADCS utilizes an incorporated autonomous control algorithm to characterize the effect of actuation of the system components ...


Design And Implementation Of Satellite Software To Facilitate Future Cubesat Development, Timothy Whitney, Jeremy Straub, Ronald Marsh Sep 2015

Design And Implementation Of Satellite Software To Facilitate Future Cubesat Development, Timothy Whitney, Jeremy Straub, Ronald Marsh

Jeremy Straub

The OpenOrbiter project is a campus-wide effort at the University of North Dakota to design and build a low-cost CubeSat-class satellite. The intent is to create a publically- available framework that allows a spacecraft to be built with a parts cost of less than USD $5,000 (excluding mission payload-specific costs). This paper focuses on OpenOrbiter’s software system methodology and implementation.

Current work seeks to create a generalized framework that other CubeSat developers can use directly or alter to suit their mission needs. It discusses OpenOrbiter’s overall design goals with an emphasis on software design. The software architecture ...


Cover Crop Biomass Production And Water Use In The Central Great Plains, David C. Nielsen, Drew J. Lyon, Gary W. Hergert, Robert K. Higgins, Johnathon D. Holman Aug 2015

Cover Crop Biomass Production And Water Use In The Central Great Plains, David C. Nielsen, Drew J. Lyon, Gary W. Hergert, Robert K. Higgins, Johnathon D. Holman

David C. Nielsen

The water-limited environment of the semiarid Central Great Plains may not produce enough cover crop biomass to generate benefits associated with cover crop use in more humid regions. There have been reports that cover crops grown in mixtures produce more biomass with greater water use efficiency than single-species plantings. This study was conducted to determine differences in cover crop biomass production, water use efficiency, and residue cover between a mixture and single-species plantings. The study was conducted at Akron, CO, and Sidney, NE, during the 2012 and 2013 growing seasons under both rainfed and irrigated conditions. Water use, biomass, and ...


Software Design For An Intelligent Attitude Determination And Control System, Matthew Russell, Jeremy Straub Aug 2015

Software Design For An Intelligent Attitude Determination And Control System, Matthew Russell, Jeremy Straub

Jeremy Straub

Space exploration and satellite missions often carry equipment that must be accurately pointed towards distant targets, therefore making an effective attitude determination and control system (ADCS) a vital component of almost every spacecraft. However, the effectiveness of the ADCS could decrease drastically if components shift during launch, degrade in efficiency over the course of the mission, or simply fail. Prior work [0] has presented a concept for a adaptive ADCS which can respond to changing spacecraft conditions and environmental factors. This poster presents an implementation for a lazy learning ADCS is presented that uses past maneuver data to construct and ...


Testing A Novel Cryptosystem For Use In Securing Small Satellite Communications, Samuel Jackson, Scott Kerlin, Jeremy Straub Aug 2015

Testing A Novel Cryptosystem For Use In Securing Small Satellite Communications, Samuel Jackson, Scott Kerlin, Jeremy Straub

Jeremy Straub

Cryptography in the domain of Small Satellites is a topic of growing importance. While large satellites are likely to have the hardware requirements to run common cryptographic algorithms, small satellites are extremely limited in both hardware capabilities, which limits the speed and security of cryptosystems implemented in software, and available physical space, which limits the ability to include cryptosystems implemented in hardware. However, small satellites are growing in popularity, and as such securing communications becomes a necessity for some. The Department of Defense is exploring the possibility of using CubeSats, a type of small satellite, in their operations, as are ...


Improving Satellite Security Through Incremental Anomaly Detection On Large, Static Datasets, Connor Hamlet, Matthew Russell, Jeremy Straub, Scott Kerlin Aug 2015

Improving Satellite Security Through Incremental Anomaly Detection On Large, Static Datasets, Connor Hamlet, Matthew Russell, Jeremy Straub, Scott Kerlin

Jeremy Straub

Anomaly detection is a widely used technique to detect system intrusions. Anomaly detection in Intrusion Detection and Prevent Systems (IDPS) works by establishing a baseline of normal behavior and classifying points that are at a farther distance away as outliers. The result is an “anomaly score”, or how much a point is an outlier. Recent work has been performed which has examined use of anomaly detection in data streams [1]. We propose a new incremental anomaly detection algorithm which is up to 57,000x faster than the non-incremental version while slightly sacrificing the accuracy of results. We conclude that our ...


Muslims Lunar’S Blindness, Sajjad Khaksari Aug 2015

Muslims Lunar’S Blindness, Sajjad Khaksari

SAJJAD KHAKSARI

The age of scientists such as Muhammad ibn Musa al-Khwarizmi (خوارزمی), Al-Farabi (فارابی), Avicenna (پور سینا), Ghiyāth al-Dīn Jamshīd Masʿūd al-Kāshī (غیاث الدین جمشید کاشانی) And Bērūnī (بیرونی) has passed and middle east regions face hideous and offensive figures of Iranian/Saudi/ISIS etc. regimes. What happened to these people and why?!


The Application And Analysis Of Midas/Gts In Landslide Control, Xiang Tao Aug 2015

The Application And Analysis Of Midas/Gts In Landslide Control, Xiang Tao

Innovative Research Publications IRP India

With the help of Midas/GTS software, we researched the landslide in mountain roads via analysis the force under its deadweight, understood the changes of the stress and strain and displacement of the slope, and analysis its force again that after joint the double-row anti-slide piles to the unstable area, until the slope reach a steady state at last, so as to attain the effect that prevent landslide disaster and deal with landslide event timely.


Pglr-Sas Data, Joseph M. Hilbe Jul 2015

Pglr-Sas Data, Joseph M. Hilbe

Joseph M Hilbe

SAS data files for Practical Guide to Logistic Regression