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Articles 61 - 90 of 246
Full-Text Articles in Entire DC Network
Percussive Penetration Of Unconsolidated Granular Media In A Laboratory Setting, Leslie S. Gertsch
Percussive Penetration Of Unconsolidated Granular Media In A Laboratory Setting, Leslie S. Gertsch
Geosciences and Geological and Petroleum Engineering Faculty Research & Creative Works
This controlled study examined the feasibility of a simple percussive approach to drilling through unconsolidated regolith deposits on Mars. The experiments showed that the approach is feasible at the low power levels and low confining pressures used, and that the rate of impact is more important to the penetration rate than is the mass of the impactor (hammer). More massive impactors tend to lower energy efficiency, as they do in terrestrial pile-driving. Unexpectedly, penetration plotted against applied energy tends to cluster into parallel linear trends. Within a given cluster, penetration is very sensitive to applied energy, while between clusters, the …
Security Architecture Methodology For Large Net-Centric Systems, Njideka Adaku Umeh
Security Architecture Methodology For Large Net-Centric Systems, Njideka Adaku Umeh
Masters Theses
"This thesis describes an over-arching security architecture methodology for large network enabled systems that can be scaled down for smaller network centric operations such as present at the University of Missouri-Rolla. By leveraging the five elements of security policy & standards, security risk management, security auditing, security federation and security management, of the proposed security architecture and addressing the specific needs of UMR, the methodology was used to determine places of improvement for UMR"--Abstract, page iii.
Assuring A Complex Safety-Critical Systems Of Systems, Steven C. Beland, Ann K. Miller
Assuring A Complex Safety-Critical Systems Of Systems, Steven C. Beland, Ann K. Miller
Electrical and Computer Engineering Faculty Research & Creative Works
This paper introduces a broad assurance approach for developing a complex, safety-critical System of Systems (SoS) in order to supplement some guidance that exists in the industry today. Drawing on these varied guidance sources for the assurance of specific technologies and others for developing a modern complex system (or SoS), this paper combines these to present objective-Based criteria to assure a complex safety-critical SoS. This guidance can enable a person or team to write a complete objective-Based development assurance plan for a complex safety-critical SoS and create completion criteria to use for recognizing when it is done. Copyright © 2007 …
Architecting System Of Systems: Artificial Life Analysis Of Financial Market Behavior, Nil Hande Ergin
Architecting System Of Systems: Artificial Life Analysis Of Financial Market Behavior, Nil Hande Ergin
Doctoral Dissertations
"This research study focuses on developing a framework that can be utilized by system architects to understand the emergent behavior of system architectures. The objective is to design a framework that is modular and flexible in providing different ways of modeling sub-systems of System of Systems. At the same time, the framework should capture the adaptive behavior of the system since evolution is one of the key characteristics of System of Systems. Another objective is to design the framework so that humans can be incorporated into the analysis. The framework should help system architects understand the behavior as well as …
Understanding Behavior Of System Of Systems Through Computational Intelligence Techniques, Nil H. Kilicay, Cihan H. Dagli
Understanding Behavior Of System Of Systems Through Computational Intelligence Techniques, Nil H. Kilicay, Cihan H. Dagli
Engineering Management and Systems Engineering Faculty Research & Creative Works
The world is facing an increasing level of systems integration leading towards systems of systems (SoS) that adapt to changing environmental conditions. The number of connections between components, the diversity of the components and the way the components are organized can lead to different emergent system behavior. Therefore, the need to focus on overall system behavior is becoming an unavoidable issue. The problem is to develop methodologies appropriate for better understanding behavior of system of systems before the design and implementation phase. This paper focuses on computational intelligence techniques used for analysis of complex adaptive systems with the aim of …
Trustworthy Computing Needs, Ann K. Miller
Trustworthy Computing Needs, Ann K. Miller
Electrical and Computer Engineering Faculty Research & Creative Works
The very label "critical infrastructure" implies that such systems are important. They are. Within the US alone, there are approximately 28,600 networked Federal Deposit Insurance Corporation (FDIC) institutions, 2 million miles of oil/gas pipelines, 2,800 power plants with 300,000 production sites, 104 nuclear power plants, 80,000 dams, 60,000 chemical plants, 87,000 food processing plants, and 1,600 water treatment plants. And, this is just part of our national infrastructure. Add to this telecommunications and other "everyday" utilities and the scope is enormous. Most of these systems, alone, would qualify as a network-centric system; that is, a system of systems (SoS) whose …
Inelastic Deformation Behavior Of La0.6sr0.4feo3 Perovskite, Nina Orlovskaya, Harlan U. Anderson, Mykola Brodnikovskyy, Mykola Lugovy, Michael John Reece
Inelastic Deformation Behavior Of La0.6sr0.4feo3 Perovskite, Nina Orlovskaya, Harlan U. Anderson, Mykola Brodnikovskyy, Mykola Lugovy, Michael John Reece
Materials Science and Engineering Faculty Research & Creative Works
Inelastic deformation behavior of the rhombohedral La0.6Sr0.4FeO3 perovskite is reported. Such behavior is very similar to the ferroelastic deformation of LaCoO3 or lead zirconate titanate perovskites, except that no twin structure was found to exist in La0.6Sr0.4FeO3. the possible mechanisms responsible for such nonlinear deformation behavior are discussed. © 2006 American Institute of Physics.
Evidence Of Two-Center Interference In High-Order Harmonic Generation From Co₂, Anh-Thu Le, Xiao-Min Tong, C. D. Lin
Evidence Of Two-Center Interference In High-Order Harmonic Generation From Co₂, Anh-Thu Le, Xiao-Min Tong, C. D. Lin
Physics Faculty Research & Creative Works
Two recent pump-probe experiments on the high-order harmonic generation (HHG) from partially aligned CO₂ molecules have shown that the HHG yields versus the ionization rates as functions of the pump-probe delay time exhibit inverted modulation. The inversion has been attributed to the quantum interference in the recombination process from the two oxygen centers. Using the Lewenstein model to calculate HHG from fixed CO₂ molecules and taking into account the partial alignment of the molecules versus the time delay, we interpret that the inversion is due to the degree of overlap between the partially aligned molecules and the angular dependence of …
The Hurwitz Zeta Function As A Convergent Series, Roman Dwilewicz, Jan Minac
The Hurwitz Zeta Function As A Convergent Series, Roman Dwilewicz, Jan Minac
Mathematics and Statistics Faculty Research & Creative Works
New series for the Hurwitz zeta function which converge on the whole plane, except s = 1, are developed. This is applied to obtain a remarkably simple evaluation of some special values of the function.
A Peano-Akô Type Theorem For Variational Inequalities, Vy Khoi Le
A Peano-Akô Type Theorem For Variational Inequalities, Vy Khoi Le
Mathematics and Statistics Faculty Research & Creative Works
We consider in this paper a Peano-Akô property of solution sets in some quasilinear elliptic variational inequalities. As consequences, variants of that property and a partial Hukuhara-Kneser theorem for inequalities are derived.
Electrostatic Active Radiation Shielding -- Revisited, John W. Wilson, R. K. Tripathi, R. C. Youngquist
Electrostatic Active Radiation Shielding -- Revisited, John W. Wilson, R. K. Tripathi, R. C. Youngquist
Mining Engineering Faculty Research & Creative Works
For the success of NASA's new vision for space exploration to Moon, Mars and beyond, exposures from the hazards of severe space radiation in deep space long duration missions is ''a must solve'' problem The payload penalty demands a very stringent requirement on the design of the spacecrafts for human deep space missions. Langley has developed state-of-the-art radiation protection and shielding technology for space missions. The exploration beyond low Earth orbit (LEO) to enable routine access to space require protection from the hazards of the accumulated exposures of space radiation, galactic cosmic rays (GCR) and solar particle events (SPE), and …
Reliability Measurement Of Mass Storage System For Onboard Instrumentation, Minsu Choi, Nohpill Park, Vincenzo Piuri, Fabrizio Lombardi
Reliability Measurement Of Mass Storage System For Onboard Instrumentation, Minsu Choi, Nohpill Park, Vincenzo Piuri, Fabrizio Lombardi
Electrical and Computer Engineering Faculty Research & Creative Works
Advances in spaceborne vehicular technology have made possible the long-life duration of the mission in harsh cosmic environments. Reliability and data integrity are the commonly emphasized requirements of spaceborne solid-state mass storage systems, because faults due to the harsh cosmic environments, such as extreme radiation, can be experienced throughout the mission. Acceptable dependability for these instruments has been achieved by using redundancy and repair. Reconfiguration (repair) of memory arrays using spare memory lines is the most common technique for reliability enhancement of memories with faults. Faulty cells in memory arrays are known to show spatial locality. This physical phenomenon is …
Conducting Business In Network Centric Collaborative Environments, Vance Saunders, Paul Bailor, Charles Cohen, Ann K. Miller, Barbra Sorensen
Conducting Business In Network Centric Collaborative Environments, Vance Saunders, Paul Bailor, Charles Cohen, Ann K. Miller, Barbra Sorensen
Electrical and Computer Engineering Faculty Research & Creative Works
The development of the World Wide Web (or Internet) has provided the ability to connect the entire world together. Thousands of web servers located around the world allow users to connect and communicate with one another. Additionally, a huge transaction-based product sales business has evolved, via the Internet. for many, the next generation of the Internet needs to focus on collections of servers and users working collectively together to solve problems. Grids and the Global Information Grid (GIG) are terms associated with enabling technologies that provide the framework for collections of servers and users to work together. Network Centric Operations …
Trends In Process Control Systems Security, Ann K. Miller
Trends In Process Control Systems Security, Ann K. Miller
Electrical and Computer Engineering Faculty Research & Creative Works
The protection of critical infrastructure systems is a hotly debated topic. The very label "critical infrastructure" implies that these systems are important, and they are: they support our everyday lives, from the water and food in our homes to our physical and financial welfare. This article explores the recent evolution of programmable logic controllers (PCSs) and their environments, explains the need for improved security in these systems, and describes some of the emerging research areas that offer promise in PCS security.
Taxonomy Of Systems-Of-Systems, James Gideon, Cihan H. Dagli, Ann K. Miller
Taxonomy Of Systems-Of-Systems, James Gideon, Cihan H. Dagli, Ann K. Miller
Engineering Management and Systems Engineering Faculty Research & Creative Works
The study of systems-of-systems is an increasingly important topic in systems engineering. Though there is not complete agreement, a more precise definition of what these highly evolved systems are and what attributes they possess has certainly emerged. However, there are still areas in the study where the topic can be advanced by a more rigorous presentation of the basic elements. One such area is the taxonomy of systems-ofsystems. This paper will begin with the definition of systems-of-systems as it currently stands and will present the taxonomy from a broader view with additional considerations for classification. These taxonomic categories will consider …
A Generic, Adaptive Systems Engineering Information Model I, Ann K. Miller, Joseph J. Simpson, Scott Erwin Grasman, Cihan H. Dagli
A Generic, Adaptive Systems Engineering Information Model I, Ann K. Miller, Joseph J. Simpson, Scott Erwin Grasman, Cihan H. Dagli
Engineering Management and Systems Engineering Faculty Research & Creative Works
This paper proposes a new network centric architecture that can be used by first responders to effectively respond to crisis situations. The powerful network-centric concept originally developed for and mainly used in the military environment, can be effectively used for civilian security and emergency response missions. This paper also proposes the use of a swarm of intelligent robots as a part of the network-centric architecture to aid the first responders. The swarm of robots works in tandem with the first responders and provides them with the necessary information on a real time basis. The proposed network centric architecture with a …
Anchoring The Potential Energy Surface Of The Cyclic Water Trimer, Julie A. Andersen, Kelly Crager, Lisa Fedoroff, Gregory S. Tschumper
Anchoring The Potential Energy Surface Of The Cyclic Water Trimer, Julie A. Andersen, Kelly Crager, Lisa Fedoroff, Gregory S. Tschumper
Chemistry Faculty Research & Creative Works
Six cyclic stationary points on the water trimer potential energy surface have been fully optimized at the MP2 level with the aug-cc-pVQZ basis set. In agreement with previous work, harmonic vibrational frequencies indicate that two structures are minima, three are transition states connecting minima on the surface while the remaining stationary point is a higher-order saddle point. The 1-and n-particle limits of the electronic energies of each of these six structures were estimated by systematically varying both the basis sets and theoretical methods. The former limit was approached with the cc-pVXZ and aug-cc-pVXZ families of basis sets (X=2-7) while MP2, …
Evaluating The Repair Of System-On-Chip (Soc) Using Connectivity, Minsu Choi, Nohpill Park, Vincenzo Piuri, Fabrizio Lombardi
Evaluating The Repair Of System-On-Chip (Soc) Using Connectivity, Minsu Choi, Nohpill Park, Vincenzo Piuri, Fabrizio Lombardi
Electrical and Computer Engineering Faculty Research & Creative Works
This paper presents a new model for analyzing the repairability of reconfigurable system-on-chip (RSoC) instrumentation with the repair process. It exploits the connectivity of the interconnected cores in which unreliability factors due to both neighboring cores and the interconnect structure are taken into account. Based on the connectivity, two RSoC repair scheduling strategies, Minimum Number of Interconnections First (I-MIN) and Minimum Number of Neighboring Cores First (C-MIN), are proposed. Two other scheduling strategies, Maximum Number of Interconnections First (I-MAX) and Maximum Number of Neighboring cores First (C-MAX), are also introduced and analyzed to further explore the impact of connectivity-based repair …
The Missouri Miner, November 11, 2004
The Missouri Miner, November 11, 2004
The Missouri Miner Newspaper
No abstract provided.
The Missouri Miner, October 28, 2004
The Missouri Miner, October 28, 2004
The Missouri Miner Newspaper
No abstract provided.
Representation Of Permittivity For Multiphase Dielectric Mixtures In Fdtd Modeling, Marina Koledintseva, J. Wu, H. Zhang, James L. Drewniak, Konstantin Rozanov
Representation Of Permittivity For Multiphase Dielectric Mixtures In Fdtd Modeling, Marina Koledintseva, J. Wu, H. Zhang, James L. Drewniak, Konstantin Rozanov
Electrical and Computer Engineering Faculty Research & Creative Works
A simple method of approximating frequency characteristics of composites in a form convenient for time-domain numerical modeling is proposed. The frequency characteristics can be obtained from experiment or calculations based on the Maxwell Garnett mixing formalism. The resultant frequency characteristic might be of a complex shape corresponding to a combination of a number of absorption peaks. The approximation is made by a series of Debye-like terms using a genetic algorithm (GA). This leads to the necessity of taking a number of terms in the approximating series. Every term corresponds to its pole, i.e., the frequency where the maximum loss occurs. …
Missouri S&T Magazine Spring 2004, Missouri S&T Marketing And Communications Department, Miner Alumni Association
Missouri S&T Magazine Spring 2004, Missouri S&T Marketing And Communications Department, Miner Alumni Association
Missouri S&T Magazine
No abstract provided.
The Missouri Miner, January 22, 2004
The Missouri Miner, January 22, 2004
The Missouri Miner Newspaper
No abstract provided.
Renormalization-Group Analysis Of The Generalized Sine-Gordon Model And Of The Coulomb Gas For D > 3 Dimensions, I. Nandori, Ulrich D. Jentschura, Kornel Sailer, Gerhard Soff
Renormalization-Group Analysis Of The Generalized Sine-Gordon Model And Of The Coulomb Gas For D > 3 Dimensions, I. Nandori, Ulrich D. Jentschura, Kornel Sailer, Gerhard Soff
Physics Faculty Research & Creative Works
Renormalization-group (RG) flow equations have been derived for the generalized sine-Gordon model (GSGM) and the Coulomb gas (CG) in d ≥ 3 of dimensions by means of the Wegner-Houghton method, and by way of the real-space RG approach. The UV scaling laws determined by the leading-order terms of the flow equations are in qualitative agreement for all dimensions d ≥ 3, independent of the dimensionality, and in sharp contrast to the special case d=2. For the 4-dimensional GSGM it is demonstrated explicitly (by numerical calculations) that the blocked potential tends to a constant effective potential in the infrared limit, satisfying …
The Missouri Miner, April 10, 2003
The Missouri Miner, March 20, 2003
The Missouri Miner, February 27, 2003
The Missouri Miner, February 27, 2003
The Missouri Miner Newspaper
No abstract provided.
An Extended Kalman Filter (Ekf) Approach On Fuzzy System Optimization Problem, Nian Zhang, Donald C. Wunsch
An Extended Kalman Filter (Ekf) Approach On Fuzzy System Optimization Problem, Nian Zhang, Donald C. Wunsch
Electrical and Computer Engineering Faculty Research & Creative Works
Optimizing the membership functions of a fuzzy system can be viewed as a system identification problem for a nonlinear dynamic system. Basically, we can view the optimization of fuzzy membership functions as a weighted least-squares minimization problem, where the error vector is the difference between the fuzzy system outputs and the target values for those outputs. The extended Kalman filter algorithm is a good choice to solve this system identification problem, not only because it is a derivative-based algorithm that is suitable to solve the weighted least-squares minimization problem, but also because of its appealing predictor-corrector feature for nonlinear system …
The Missouri Miner, October 17, 2002
The Missouri Miner, October 17, 2002
The Missouri Miner Newspaper
No abstract provided.
Electron-Impact Excitation From The (4p⁵5s) Metastable States Of Krypton, Arati K. Dasgupta, Klaus Bartschat, D. Vaid, Alexei N. Grum-Grzhimailo, Don H. Madison, Milan Blaha, John L. Giuliani
Electron-Impact Excitation From The (4p⁵5s) Metastable States Of Krypton, Arati K. Dasgupta, Klaus Bartschat, D. Vaid, Alexei N. Grum-Grzhimailo, Don H. Madison, Milan Blaha, John L. Giuliani
Physics Faculty Research & Creative Works
Theoretical results from multistate semirelativistic Breit-Pauli R-matrix calculations and two first-order distorted-wave calculations are presented for electron-impact excitation of krypton from the (4p55s) J = 0,2 metastable states to the (4p55s) and (4p55p) manifolds. Except for a few cases, in which the method to account for relativistic effects becomes surprisingly critical, fair overall agreement between the predictions from the various theoretical models is achieved for intermediate and high energies. However, significant discrepancies remain with the few available experimental data.