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(641 - 660 of 5,966)
Pages
- Title
- Preparation of 1-Benzoyloxydipropyl Sulfide
- Creator
- Sosnovsky, George
- Date
- 4/23/2009, 1966-12-06
- Description
-
Sponsorship: IIT Research Institute
United States Patent
- Title
- THE RELATIONS OF LEADER EMPOWERING BEHAVIORS ON EMPLOYEE PERFORMANCE: MODERATED BY GENDER DYAD COMPOSITION
- Creator
- Zigun, David J
- Date
- 2016, 2016-07
- Description
-
This study examined the possible moderating effect of gender dyadic composition on the relationship between Leadership Empowering Behaviors ...
Show moreThis study examined the possible moderating effect of gender dyadic composition on the relationship between Leadership Empowering Behaviors (LEBs) and employee performance across 221 supervisor-subordinate dyads in a Fortune 500 Midwestern U.S. company. The relationships between LEBs and employee performance moderated by gender dyadic composition were examined, as well as possible group differences of LEB ratings between gender dyad group membership. The goal of this study was to test the moderating role of gender dyadic composition on the relationship between LEBs and employee performance. This study obtained both supervisor ratings of employee performance and employee ratings of LEBs, allowing for the use of multi-source data. Results supported the expected relationship between LEBs and employee performance but neither indications of a moderating effect by gender dyads were found, nor were there group differences in perceptions of LEBs. This study adds to the existing literature because previous research has predominantly focused on examining employee perceptions of LEBs and related outcomes, but this was the first study to explore the potential moderating effect of gender dyads in this relationship. Implications of this study are explored.
M.S. in Psychology, July 2016
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- Title
- Magnetic Recording System and Method
- Creator
- Camras, Marvin
- Date
- 2009-05-08, 1986-12-09
- Description
-
Magnetic recording circuitry supplies to the recording head in addition to the signal to be recorded a train of constant amplitude pulses of...
Show moreMagnetic recording circuitry supplies to the recording head in addition to the signal to be recorded a train of constant amplitude pulses of extremely short duration and of low duty cycle; for example, pedestal pulses of polarity corresponding to the signal are superimposed on the signal for higher positive and negative signal amplitudes, while alternating polarity pulses are supplied during periods of low signal amplitude, such that the transducer system exhibits a substantially linear transfer function.
Sponsorship: IIT Research Institute
United States Patent
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- Title
- Magnetic Recorder with Pad to Damp High Frequency Vibration of Tape
- Creator
- Camras, Marvin
- Date
- 4/24/2009, 1970-02-10
- Description
-
Sponsorship: IIT Research Institute
United States Patent
- Title
- DEVELOPMENT OF A TESTBED FOR STUDYING SECURITY ISSUES IN VOIP NETWORKS
- Creator
- Olawoye, Oladeji
- Date
- 2011-12-06, 2011-12
- Description
-
VoIP is increasingly becoming an alternative to the traditional PSTN for Telephony this is as a result of certain advantages and services...
Show moreVoIP is increasingly becoming an alternative to the traditional PSTN for Telephony this is as a result of certain advantages and services offered by VoIP. VoIP will be considered able to fully replace PSTN if it can provide same or better Quality of Service and Security guaranty as PSTN. Delivering telephony services over (best-effort and connectionless) IP data network faces two main issues not experienced in PSTN, security and quality of service; security in the sense that telephone calls will be susceptible to attacks that are known in the Internet, quality of service in the sense that voice packets now have to compete with packets of other traffic for a limited bandwidth. Researches are ongoing in these two fields to make experience on VoIP similar to the traditional telephone. The focus of this thesis work is in the security aspect. SIP protocol has become one of the most popular signaling protocols used for VoIP, SIP architecture is an open architecture originally developed for trusted communications among trusted partners, and therefore much thought was not given to security. Adopting SIP as a main protocol used in VoIP in the Internet where there are where there are lots of hostile users calls for more ways to properly secure its use. The thesis work involves setting up of a SIP based VoIP network based on open source SIP telephony platforms to study various security issues in a SIP-Based VoIP network and experiment some proposed detection mechanism. The contribution of this work is to develop a graphical user interface in the UNIX environment using Java that makes the execution of the attack scenarios easy to carry out and observe.
M.S. in Electrical Engineering, December 2011
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- Title
- Study of ideal dry pipe valve
- Creator
- Hepp, A. A., Smith, E. J. L.
- Date
- 2009, 1906
- Publisher
- Armour Institute of Technology
- Description
-
http://www.archive.org/details/studyofidealdryp00hepp
Thesis (B.S.)--Armour Institute of Technology
- Title
- Electrical Musical Instrument
- Creator
- Vagtborg, Harold A.
- Date
- 2012-03-20, 1951-04-17
- Description
-
Sponsorship: Armour Research Foundation of Illinois Institute of Technology
United States Patent
- Title
- Using Controlled Unsteady Fluid Mass Addition to Enhance Jet Mixing
- Creator
- Raman, G.
- Date
- 1997-04
- Publisher
- American Inst Aeronaut Astronaut
- Description
-
A rectangular jet was excited by controlled unsteady fluid mass addition using two miniature fluidic jets placed on either side of its narrow...
Show moreA rectangular jet was excited by controlled unsteady fluid mass addition using two miniature fluidic jets placed on either side of its narrow dimension. The subharmonic of the primary's preferred jet column frequency [St(D-e) = fD(e)/U-J = 0.15] was forced in the antisymmetric mode because such forcing persists for longer downstream distances than the fundamental. Details of the phase-averaged flowfield, velocity gradient terms, velocity spectra, and the mean and fluctuating flowfields were documented. The fluidically excited mode grew and persisted in the flow beyond the potential core region. Unsteady fluid mass addition of 12% (4% momentum addition) per fluidic jet resulted in a 35% reduction of the potential core length and about a 60% increase in the normalized mass flux (percentages are with reference to the primary unforced jet). On the basis of the results, it appears that fluidic devices have the potential for use in shear flow control applications.
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- Title
- Method for Improving Local Descriptors in Peer-to-Peer File Sharing
- Creator
- Frieder, Ophir, Yee, Wai Gen
- Date
- 2012-03-20, 2009-07-07
- Description
-
A method for improving searches in a peer-to-peer (P2P) file sharing system that includes a plurality of server computers. A content file,...
Show moreA method for improving searches in a peer-to-peer (P2P) file sharing system that includes a plurality of server computers. A content file, identified by a descriptor including at least one metadata term and a mathematical identifier that uniquely identifies the content file in one of the server computers, is selected for searching. Other server computers are searched to find one or more matching content files; one that has a descriptor with a mathematical identifier matching the mathematical identifier of the first content file. The descriptors of the matching content files are returned to the searching server computer and used to expand the local descriptor.
Sponsorship: Illinois Institute of Technology
United States Patent
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- Title
- COMPRESSIVE SENSING AND RECONSTRUCTION : THEORY AND APPLICATIONS
- Creator
- Krishnamurthy, Ritvik Nadig
- Date
- 2014, 2014-07
- Description
-
Conventional approach in acquisition and reconstruction of images from frequency domain strictly follow the Nyquist sampling theorem. The...
Show moreConventional approach in acquisition and reconstruction of images from frequency domain strictly follow the Nyquist sampling theorem. The principle states that the sampling frequency required for complete reconstruction of a signal is at least twice the maximum frequency of the original signal. This dissertation studies an emerging theory called Compressive Sensing or Compressive Sampling which goes against the conventional wisdom. Theoretically, it is possible to reconstruct images or signals accurately from a number of samples which is far smaller than the Nyquist samples. Compressive Sensing has proven to have farther implications than merely reducing sampling frequency of the signal. Possibility of new data acquisition methods from analog domain to digital form using fewer sensors, image acquisition using much smaller sensors array, to name a few. This novel theory combines sampling and compression methods thereby reducing the data acquisition resources, such as number of sensors, storage memory for collected samples and maximum operating frequency. This dissertation presents some insights into reconstruction of grey scale images and audio signals using OMP and CoSaMP algorithms. It also delves into some of the key mathematical insights underlying this new theory and explains some of the interactions between Compressive Sensing and related elds such as statistics, coding theory and theoretical computer science. viii
M.S. in Computer Engineering, July 2014
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- Title
- Center for Interdisciplinary Education: tA_Final Board
- Creator
- Alvarez, Tomas
- Date
- 4/20/2011, 2011-05
- Description
-
This project consists of developing an efficient collegiate building in which the disciplines of Business, Mathematics, and Science can...
Show moreThis project consists of developing an efficient collegiate building in which the disciplines of Business, Mathematics, and Science can interact, collaborate, and ultimately create new knowledge by merging existing information. "All disciplines have imported aspects of other fields to clarify their own disciplinary perspectives."
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- Title
- Combined Magnetic Transducer Head and Coupling Transformer
- Creator
- Wiegand, David E.
- Date
- 1954-11-09
- Description
-
Sponsorship: Armour Research Foundation of Illinois Institute of Technology
United States Patent
- Title
- Method for Detecting a Mass Density Image of an Object
- Creator
- Hasnah, Moumen O., Chapman, Leroy Dean
- Date
- 2009-05-19, 2006-07-11
- Description
-
A method for detecting a mass density image of an object. An x-ray beam is transmitted through the object and a transmitted beam is emitted...
Show moreA method for detecting a mass density image of an object. An x-ray beam is transmitted through the object and a transmitted beam is emitted from the object. The transmitted beam is directed at an angle of incidence upon a crystal analyzer. A diffracted beam is emitted from the crystal analyzer onto a detector and digitized. A first image of the object is detected from the diffracted beam emitted from the crystal analyzer when positioned at a first angular position. A second image of the object is detected from the diffracted beam emitted from the crystal analyzer when positioned at a second angular position. The first image and the second image are combined mathematically to derive a mass density image of the object.
Sponsorship: Illinois Institute of Technology
United States Patent
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- Title
- Means for Counteracting Shunt Reluctance of a Transducer Head Gap
- Creator
- Camras, Marvin
- Date
- 1961-03-14
- Description
-
Sponsorship: Armour Research Foundation of Illinois Institute of Technology
United States Patent
- Title
- LOG ANALYSIS FOR RELIABILITY MANAGEMENT IN LARGE-SCALE SYSTEMS
- Creator
- Zheng, Ziming
- Date
- 2012-07-16, 2012-07
- Description
-
With the increasing scale and complexity of high performance computing (HPC) systems, reliability management is becoming a major concern....
Show moreWith the increasing scale and complexity of high performance computing (HPC) systems, reliability management is becoming a major concern. System logs are the primary source of information to understand and analyze system problems. Nevertheless, manual log processing is time-consuming, error-prone, and not scalable. Currently little study has been done on automated log analysis for practical use in HPC systems. In this thesis, we present a log analysis infrastructure by exploiting data mining and machine learning technologies. Our work can be broadly divided into four parts: log pre-processing, online failure prediction, automatic root cause diagnosis, and reliability modeling. We evaluate our results by means of system logs collected from production HPC systems. This work can greatly improve our understanding of faults and failures arising from hardware/software components and their interactions. It can further facilitate the reliability management for HPC systems.
Ph.D. in Computer Science, July 2012
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- Title
- NONLINEAR PREDICTIVE CONTROL OF PERIODICALLY FORCED CHEMICAL REACTORS
- Creator
- Ozgulsen, F., Kendra, S. J., Cinar, A.
- Date
- 1993-04
- Publisher
- AMER INST CHEMICAL ENGINEERS
- Description
-
A nonlinear model-predictive control strategy is developed to maintain the superior-to-steady-state performance of a periodically forced...
Show moreA nonlinear model-predictive control strategy is developed to maintain the superior-to-steady-state performance of a periodically forced chemical reactor. The performance of the predictive con troller is investigated in the presence of measurement disturbances and parametric uncertainty. It is also shown that statistically inferred input-output models can be a substitute whenever detailed fundamental models are not available. A nonlinear autoregressive polynomial model based on observed plant data is built and incorporated into the control scheme. The catalytic oxidation of ethylene in a periodically-forced, continuous stirred-tank reactor is considered as the test case.
Endnote format citation
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- Title
- APPLICATION OF SPECTRUM OBSERVATORY MEASUREMENTS TO SUPPORT TRAFFIC MODEL-BASED DYNAMIC SPECTRUM ACCESS
- Creator
- Taher, Tanim Mohammed
- Date
- 2014, 2014-07
- Description
-
In a 2012 report, the President’s Council of Advisors in Science and Technology (PCAST) published a memorandum that calls for the...
Show moreIn a 2012 report, the President’s Council of Advisors in Science and Technology (PCAST) published a memorandum that calls for the identification of 1000 MHz of Federal Spectrum to be shared with private (commercial) users. This dissertation proposes a system that employs RF measurements for spectrum usage modeling and Dynamic Spectrum Access (DSA) methodologies that utilize the modeling information to permit sharing of wireless resources. A procedure called the Comprehensive Band Modeling (CBM) procedure is developed that automatically models measured RF data from any band of interest and identifies the locations of signals and holes present in the band. The output of the CBM procedure is summarized in a compact versatile format that makes DSA applications feasible. The research primarily focuses on the 450-474 MHz land mobile radio (LMR) band, and several additional bands like the TV band and the 2.5-2.7 GHz band. However, the research methodology and techniques are broadly applicable to many more frequency ranges. The research has four main areas: (a) spectrum sensor design and measurements, (b) occupancy modeling, (c) communicating the modeling information in a compact form to secondary users to support DSA algorithms and protocols, and (d) tools and metrics for spectrum sharing favorability analysis. Three spectrum sensor platforms were employed in measurements – (1) a spectrum analyzer based Spectrum Observatory (SO) that was developed earlier, (2) a specially purposed software-defined radio (SDR) for measuring LMR channels, (3) and a high-speed and portable SO system based on a sensor called the RFeye. An SO continually measures RF data in a band at a high temporal resolution such that the channel switching activity is seen – like, transmitters turning on and off. Spectrum measurements of the individual RF channels in the 450-474 MHz LMR band and the two commercial bands are used to generate statistical traffic and occupancy models. Long-term measurement data is used to assess how stationary the channel is, and how often the model parameters need to be updated. The spectrum observatory supports a network of Secondary Users (SU) by communicating the traffic model parameters in a compact format to the SUs. The SUs share Primary User (PU) channels via DSA techniques. The DSA algorithms take advantage of the model parameters provided by the SO to maximize SU throughput with limited interference on the PU. The DSA coexistence techniques are evaluated via simulation. The simulation results including Spectrum Opportunity Accessed (SOA), SU throughput, and collision rates are then analyzed to provide an assessment of DSA-based spectrum sharing in that band. The main contribution of this dissertation is the aforementioned CBM procedure. The white spaces in the frequency and time domains, that is, the underutilized spectrum opportunities available for possible secondary use via DSA are automatically identified, as well as the frequency locations that are not conducive to DSA due to the presence of frequent primary licensee transmissions. In CBM, white spaces are referred to as ‘Holes’, and the licensed primary transmission frequencies as ‘Signals’. Useful information about the duty cycles and traffic patterns of incumbent users’ activity within possible secondary use channels is extracted and modeled. The model enables prospective secondary users of white spaces to predict the expected level of interference in any channel, which allows for channel ranking and optimal selection of DSA transmission parameters. The CBM model is describable by a tiered structure, where the first tier identifies the holes and signals; the second tier ranks the holes in terms of available bandwidth and incumbent duty cycle; and the third tier models the infrequent incumbent transmissions. With the three tiers of information, an SU can readily identify all the suitable DSA channels within the entire spectrum band. This essential summary information is retrieved as a “Hole Descriptor Object” (HDO) that is both compact and tractable. Empirical spectrum measurement data obtained from the three different SO platforms is used to test the performance of the CBM procedure in the 2500-2700 MHz frequency range that currently has WiMAX deployments, the TV white space band, and the 450-474 MHz LMR band in Chicago. Spectrum measurement data runs into hundreds of megabytes or gigabytes. As such, the raw information is not very applicable in practical wireless networks. The HDO objects on the other hand are compact and only kilobytes in size. The HDO objects contain all the useful and applicable information necessary for any smart radio (primary or secondary) to select transmission parameters like frequency of operation and bandwidth, so that it can efficiently operate. Thus, the advantage of the CBM procedure is that it summarizes gigabytes of raw spectrum measurements in a usable compact format that can be directly used by practical smart radios to operate using DSA paradigms. Another advantage of CBM is that it is comprehensive and automatically identifies all holes and signals. The research findings are of interest and value to a variety of Federal and Commercial entities. The models and relevant model parameters for public safety radio in the LMR band have been provided on request to the Public Safety and Homeland Security Bureau of the Federal Communications Commission (FCC). The DSA feasibility analysis methodology is of great national economic interest based on the contents of the PCAST report. The PCAST report recommends finding 1000 MHz of federal frequencies to be allocated for shared commercial and federal use. However, the technology for doing so and identifying the suitable bands requires measurements of actual spectrum usage, modeling the occupancy and existing traffic activity, and assessing DSA feasibility – these are important research aspects, and all of which are addressed in this dissertation. The results are of crucial importance to policy makers like the FCC and NTIA who will ultimately make the spectrum allocations decisions. A future network of commercial DSA SU radios operating in a shared band is likely to need access to a system to obtain live information about PU activity to optimally operate in the band with high throughput and low interference. The overall system, based on the CBM procedure and HDO objects, proposed in this thesis describes a framework for providing this information as a service to DSA networks, and hence the work is also of practical relevance to radio system designers.
Ph.D. in Electrical Engineering, July 2014
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- Title
- Automatic Insulin Pumps Using Recursive Multivariable Models and Adaptive Control Algorithms
- Creator
- Cinar, Ali, Oruklu, Meriyan
- Date
- 2014-04-09, 2014-04-08
- Description
-
A method and device for monitoring or treating patient glucose levels. The device includes a glucose sensor for measuring a glucose level of a...
Show moreA method and device for monitoring or treating patient glucose levels. The device includes a glucose sensor for measuring a glucose level of a patient, a physiological status monitoring system for measuring at least one physical or metabolic variable of the patient, and an automatic controller in communication with the glucose sensor and the physiological status monitoring system. The controller includes a prediction module for automatically predicting a future glucose level using data measured by the glucose sensor and the physiological sensor.
Sponsorship: Illinois Institute of Technology
United States Patent
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- Title
- PSYCHOLOGICAL WELL-BEING AND ONLINE MINDFULNESS TRAINING
- Creator
- Stickney, Laurie
- Date
- 2013-04-15, 2013-05
- Description
-
Despite the improvements in resources and communication in today’s world, many people still do not have access to mental health resources....
Show moreDespite the improvements in resources and communication in today’s world, many people still do not have access to mental health resources. Mindfulness, a type of meditation, has been shown to be effective at reducing stress, reducing pain, and increasing general mental well-being. Mindfulness has the potential to reach many people though internet-based interventions. However, more research is needed to determine whether mindfulness retains its efficacy when delivered over the internet. Participants engaged in a six week program of internet-based mindfulness interventions. Facets of mental well-being were assessed at various time points including mood state, anxiety, quality of life, mindfulness, and psychological inflexibility. Hierarchical Linear Modeling demonstrated that over time, participants significantly increased their level of mindfulness and decreased in their psychological inflexibility. Measurements pertaining to mood, anxiety, quality of life, and perceived stress did not change significantly. Nonetheless, results from the present study suggest the potential efficacy of internet-based mindfulness interventions and highlight the need for future research in this domain.
M.S. in Psychology, May 2013
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- Title
- Study of electric rates and ratemaking
- Creator
- Barrer, Glen A, Shaffer, Sydney
- Date
- 2009, 1915
- Publisher
- Armour Institute of Technology
- Description
-
http://www.archive.org/details/studyofelectricr00barr
Thesis (B.S.)--Armour Institute of Technology, 1915 Bibliography: leaves 43-47 B.S. in...
Show morehttp://www.archive.org/details/studyofelectricr00barr
Thesis (B.S.)--Armour Institute of Technology, 1915 Bibliography: leaves 43-47 B.S. in Electrical Engineering, 1915
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