Digital Commons Network^™

Dependence Of The Performance Of Single Photon Avalanche Diodes On The Multiplication Region Width, David A. Ramirez, Majeed M. Hayat, Mark A. Itzler

Electrical and Computer Engineering Faculty Research and Publications

The dependence of the performance of separate-absorption-multiplication (SAM) single-photon avalanche diodes (SPADs) on the width of the multiplication region is theoretically investigated. The theory is applied to SAM SPADs with InP homojunction multiplication regions and InAlAs-InP heterojunction multiplication regions. In both cases the absorber layer is InGaAs. Two scenarios for the dark counts are considered: (i) low-temperature operation, when the number of dark carriers is dominated by field-assisted mechanisms of band-to-band tunneling and tunneling through defects; and (ii) room-temperature operation, when the number of dark carriers in the multiplication region is dominated by the generation/recombination mechanism. The analysis utilizes a …

Dit News, 1st.-31st. Of December, 2008, Dit:Students Union

DIT Student Union

No abstract provided.

Optimizing Micro-Grid Operations In The Presence Of Wind Generation, Nikhil K. Ardeshna, Badrul H. Chowdhury

Electrical and Computer Engineering Faculty Research & Creative Works

Conceptually, a micro-grid can operate in parallel with the main grid system to support the grid voltage or as an isolated system to support customers isolated from the grid. in islanding operations, the micro-grid can continue to supply power to the customers thereby increasing the reliability of the power system. in a micro-grid with a significant percentage of wind power, a reactive power source would be needed to keep the wind power generating in islanded mode. the problem of load following is investigated in this situation. in addition, the use of Static Synchronous Compensator (STATCOM) and battery energy storage system …

Implementation And Analysis Of Practical Algorithm For Data Security, Willi Ballenthin, F. Kacani, Julia Albath, Sanjay Kumar Madria

Computer Science Faculty Research & Creative Works

In this paper, we present a complete implementation of the Practical Algorithm for Data Security (PADS) proposed by Albath et al., an end-to-end security scheme employing symmetric key encryption. The implementation takes full advantage of the modular design of the TinyOS environment. The simplicity of the algorithm allows for efficient implementation in hardware, a requirement for resource constrained devices. The protocol adds only four bytes of data per packet, on par with industry standards. Simulation and empirical results of the scheme are also provided. The analysis shows that the Practical Algorithm for Data Security is superior to standard security schemes.

Distributing Complementary Resources Across Multiple Periods With Stochastic Demand, Shih-Fen Cheng, John Tajan, Hoong Chuin Lau

Research Collection School Of Computing and Information Systems

In this paper, we evaluate whether the robustness of a market mechanism that allocates complementary resources could be improved through the aggregation of time periods in which resources are consumed. In particular, we study a multi-round combinatorial auction that is built on a general equilibrium framework. We adopt the general equilibrium framework and the particular combinatorial auction design from the literature, and we investigate the benefits and the limitation of time-period aggregation when demand-side uncertainties are introduced. By using simulation experiments, we show that under stochastic conditions the performance variation of the process decreases as the time frame length (time …

Mobitop: Accessing Hierarchically Organized Georeferenced Multimedia Annotations, Thi Nhu Quynh Kim, Khasfariyati Razikin, Dion Hoe-Lian Goh, Quang Minh Nguyen, Ee Peng Lim

Research Collection School Of Computing and Information Systems

We introduce MobiTOP, a map-based interface for accessing hierarchically organized georeferenced annotations. Each annotation contains multimedia content associated with a location, and users are able to annotate existing annotations, in effect creating a hierarchy.

Pas: Predicate-Based Authentication Services Against Powerful Passive Adversaries, Sriram Chellappan, Xiaole Bai, Wenjun Gu, Xun Wang, Dong Xuan, Bin Ma

Computer Science Faculty Research & Creative Works

Securely authenticating a human user without assistance from any auxiliary device in the presence of powerful passive adversaries is an important and challenging problem. Passive adversaries are those that can passively monitor, intercept, and analyze every part of the authentication procedure, except for an initial secret shared between the user and the server. In this paper, we propose a new secure authentication scheme called predicate-based authentication service (PAS). In this scheme, for the first time, the concept of a predicate is introduced for authentication. We conduct analysis on the proposed scheme and implement its prototype system. Our analytical data and …

Neural-Network-Based State Feedback Control Of A Nonlinear Discrete-Time System In Nonstrict Feedback Form, Pingan He, Jagannathan Sarangapani

Electrical and Computer Engineering Faculty Research & Creative Works

In this paper, a suite of adaptive neural network (NN) controllers is designed to deliver a desired tracking performance for the control of an unknown, second-order, nonlinear discrete-time system expressed in nonstrict feedback form. In the first approach, two feedforward NNs are employed in the controller with tracking error as the feedback variable whereas in the adaptive critic NN architecture, three feedforward NNs are used. In the adaptive critic architecture, two action NNs produce virtual and actual control inputs, respectively, whereas the third critic NN approximates certain strategic utility function and its output is employed for tuning action NN weights …

Link Rate Allocation Under Bandwidth And Energy Constraints In Sensor Networks, Maggie Cheng, Xuan Gong, Lin Cai

Computer Science Faculty Research & Creative Works

In sensor networks, both energy and band width are scarce resources. in the past, the energy efficient routing problem has been vastly studied in order to maximize network lifetime, but link bandwidth has been optimistically assumed to be abundant. as energy con straint affects how data should be routed, link bandwidth also affects not just the routing topology but also the allowed data rate on each link, which in turn affects lifetime. Previous works that focus on energy efficient operations in sensor networks with the sole objective of maximizing network lifetime only consider the energy constraint and ignore the bandwidth …

The Phonology And Morphology Of The Dar Daju Daju Language, Arthur J. Aviles

Theses and Dissertations

A recurring theme among linguists is the need for more languages to be analyzed and more descriptions to be available for a variety of reasons. The main purpose of this thesis is to provide essential information on the Daju Dar Daju language of Chad, Africa that will assist in future language development work among the Daju Dar Daju people as well as to provide additional information for possible future work among related languages.

Very little work has been done on the Daju languages as a whole and to date almost nothing on the Dar Daju Daju. The Dar Daju Daju …

Cortisol Response Of Non-Suicidal Self-Injurers Versus Non-Self-Injurers Exposed To A Social Rejection Laboratory Stressor, Patrick L. Kerr

Theses and Dissertations

Non-suicidal self-injury (NSI) represents a growing area of concern in a variety of clinical settings, yet remains a poorly understood phenomenon. An influx of research on the functions of NSI over the past decade has suggested a biopsychosocial emotional regulation model of this behavior. This model proposes that self-injurers engage in NSI to reduce negative emotions, and presupposes that self-injurers are characterized by emotional dysregulation. The present study evaluated the biological component of this model by assessing hypothalamic-pituitary-adrenocortical axis (HPAA) functioning in a group of self-injurers(n=26) and non-injuring healthy controls (n=28). HPAA functioning was assessed via measuring salivary cortisol levels …

The Day We All Became Hokies: An Exploratory Uses And Gratifications Study Of Facebook Use After The Virginia Tech Shootings, Sabrena Michelle Carter

Masters Theses

Facebook has been incorporated into the regular activities of over 100 million users. After the Virginia Tech Shootings, individuals began interacting with Facebook in a unique way. This exploratory project analyzed uses and gratifications of Facebook use in the time following the Virginia Tech shootings. In-depth qualitative interviews were conducted with seven college students whose Facebook profiles acknowledged the event in at least one area.

The study found preliminary evidence of Blumler's categories of Surveillance, Diversion, Personal Identity, and Personal Relationships. The category of Curiosity was not substantiated in the findings. New categories were suggested based on the results. These …

Jewish Museums - A Multi-Cultural Destination Sharing Jewish Art And Traditions With A Diverse Audience, Jennifer B. Markovitz

Seton Hall University Dissertations and Theses (ETDs)

As American society becomes more diverse, issues of ethnic self· consciousness are increasingly prevalent. This can be witnessed by the national expansion and development of ethnic museums. At least twenty-five museums representing different ethnicities are located in New York City alone. These museums reach out to their own constituency as a celebration of heritage and culture. In an effort to educate others and foster a greater understanding and appreciation of their culture, they also reach out to a diverse multi-cultural audience. Following suit, Jewish museums attract a diverse audience representing a variety of religions and ethnicities. Jewish Museums - A …

A Fast Pruned‐Extreme Learning Machine For Classification Problem, Hai-Jun Rong, Yew-Soon Ong, Ah-Hwee Tan, Zexuan Zhu

Research Collection School Of Computing and Information Systems

Extreme learning machine (ELM) represents one of the recent successful approaches in machine learning, particularly for performing pattern classification. One key strength of ELM is the significantly low computational time required for training new classifiers since the weights of the hidden and output nodes are randomly chosen and analytically determined, respectively. In this paper, we address the architectural design of the ELM classifier network, since too few/many hidden nodes employed would lead to underfitting/overfitting issues in pattern classification. In particular, we describe the proposed pruned-ELM (P-ELM) algorithm as a systematic and automated approach for designing ELM classifier network. P-ELM uses …

Adoption Of 3-D Virtual Worlds For Education, X. Chen, Keng Siau, Fiona Fui-Hoon Nah

Research Collection School Of Computing and Information Systems

As an emerging phenomenon, virtual world education is rarely researched in MIS literature. With stiff competition among institutions using virtual worlds for education, a legitimate research question is: What factors influence students’ intention to adopt 3-D virtual world environment for their education needs? Drawing on existing technology acceptance models and studies in other IS contexts, we developed a model to predict students’ acceptance of a 3-D virtual world education environment and plan to empirically test the model using survey data collected from college students. From the academic research perspective, studies on the use of the new technology for education will …

Chosen-Ciphertext Secure Proxy Re-Encryption Without Pairing, Robert H. Deng, Jian Weng, Shengli Liu, Kefei Chen

Research Collection School Of Computing and Information Systems

In a proxy re-encryption system, a semi-trusted proxy can convert a ciphertext originally intended for Alice into a ciphertext intended for Bob, without learning the underlying plaintext. Proxy re-encryption has found many practical applications, such as encrypted email forwarding, secure distributed file systems, and outsourced filtering of encrypted spam. In ACM CCS'07, Canetti and Hohenberger presented a proxy re-encryption scheme with chosen-ciphertext security, and left an important open problem to construct a chosen-ciphertext secure proxy re-encryption scheme without pairings. In this paper, we solve this open problem by proposing a new proxy re-encryption scheme without resort to bilinear pairings. Based …

Privacy Engine For Context-Aware Enterprise Application Services, Marion Blount, John Davis, Maria Ebling, William Jerome, Barry Leiba, Xuan Liu, Archan Misra

Research Collection School Of Computing and Information Systems

Satisfying the varied privacy preferences of individuals, while exposing context data to authorized applications and individuals, remains a major challenge for context-aware computing. This paper describes our experiences in building a middleware component, the context privacy engine (CPE), that enforces a role-based, context-dependent privacy model for enterprise domains. While fundamentally an ACL-based access control scheme, CPE extends the traditional ACL mechanism with usage control and context constraints. This paper focuses on discussing issues related to managing and evaluating context-dependent privacy policies. Extensive experimental studies with a production-grade implementation and real-life context sources demonstrate that the CPE can support a large …

Innovation In The Programmable Web: Characterizing The Mashup Ecosystem, C. Jason Woodard, Shuli Yu

Research Collection School Of Computing and Information Systems

This paper investigates the structure and dynamics of the Web 2.0 software ecosystem by analyzing empirical data on web service APIs and mashups. Using network analysis tools to visualize the growth of the ecosystem from December 2005 to 2007, we find that the APIs are organized into three tiers, and that mashups are often formed by combining APIs across tiers. Plotting the cumulative distribution of mashups to APIs reveals a power-law relationship, although the tail is short compared to previously reported distributions of book and movie sales. While this finding highlights the dominant role played by the most popular APIs …

Making Sense Of Technology Trends In The Information Technology Landscape, Gediminas Adomavicius, Jesse C. Bockstedt, Alok Gupta, Robert J. Kauffman

Research Collection School Of Computing and Information Systems

A major problem for firms making information technology investment decisions is predicting and understanding the effects of future technological developments on the value of present technologies. Failure to adequately address this problem can result in wasted organization resources in acquiring, developing, managing, and training employees in the use of technologies that are short-lived and fail to produce adequate return on investment. The sheer number of available technologies and the complex set of relationships among them make IT landscape analysis extremely challenging. Most IT-consuming firms rely on third parties and suppliers for strategic recommendations on IT investments, which can lead to …

The Role Of Causal Processes In The Neutral And Nearly Neutral Theories, Michael R. Dietrich, Roberta L. Millstein

Dartmouth Scholarship

The neutral and nearly neutral theories of molecular evolution are sometimes characterized as theories about drift alone, where drift is described solely as an outcome, rather than a process. We argue, however, that both selection and drift, as causal processes, are integral parts of both theories. However, the nearly neutral theory explicitly recognizes alleles and/or molecular substitutions that, while engaging in weakly selected causal processes, exhibit outcomes thought to be characteristic of random drift. A narrow focus on outcomes obscures the significant role of weakly selected causal processes in the nearly neutral theory.

Bienvenidos, Amigos! : The Tapestry Magazine, Liz Rog

Postville Project Documents

Article on the arrival of 10 men in Decorah after their incarceration from the Postville raid.

Flute Ensemble Will Perform Carol Concerts Prelude, University Relations

Campus News Archive

The University of Minnesota, Morris Flute Ensemble, under the direction of Jeanne Richards, will provide prelude music before each of the UMM Carol Concerts Friday through Sunday, Dec. 5, 6 and 7. The Ensemble will perform at 7 p.m. prior to the evening performances and at 1:30 p.m. prior to the Sunday afternoon concert.

Symphonic Winds Concert—Favorites For Everyone, University Relations

Campus News Archive

The University of Minnesota, Morris Symphonic Winds will present their December concert at 3 p.m. Saturday, Dec. 13, in the Morris Area Concert Hall. A program variety of large ensemble and chamber music selections, from seasonal to symphonic repertoire, will offer a personal favorite for everyone!

Jim Keady: Behind The Swoosh, University Relations

Campus News Archive

Former professional soccer player and former college coach, Jim Keady will present “Behind the Swoosh,” the third in the Campus Activities Council Convocations Lecture Series, on Monday, Dec. 8, at 7:30 p.m. in Edson Auditorium of the Student Center.

A Systematic Approach To History Matching Cbm Production On A Complex Reservoir For A Pilot Test In Marshall County, Wv, Us, Cesar A. Silva Molero

Graduate Theses, Dissertations, and Problem Reports (ETD)

Effective history matching of a simulation model with real data from the field requires the resolution of three outstanding issues. First, a conflict may exist between the production data and the existing geological model built from static information. Second, during model updates, geological consistency must be maintained by honoring the prior geologic information. Third, uncertainties related to mechanical and operational issues must be taken into account.;The objective of this study is to build a realistic simulation model able to predict future behavior of a complex CBM reservoir for a CO2 sequestration pilot project in Marshall County, WV by using a …

Design And Implementation Of A Multithreaded Softcore Processor With Tightly Coupled Hardware Real-Time Operating System, Terance Prabhasara Wijesinghe

Graduate Theses, Dissertations, and Problem Reports (ETD)

The objective of this thesis is to design and implement an FPGA-based softcore processor with hardware Real Time Operating System (RTOS).;RTOSs provide an abstracted environment on top of the hardware with different mechanisms to simplify and coordinate the behavior of the system. Software mechanisms including multithreading, semaphores, timers, interrupts, etc. consume large amounts of CPU time which increases overhead and contributes to the degradation of the performance. In order to offload this overhead, RTOSs with hardware acceleration have been a research topic with considerable interest. Most research works are focused on the design of a hardware RTOS external to the …

Maximizing Warfighter Capability Using Surveyed Necessity Measurement: Application To The Usaf F-15c Fleet, John M. Colombi, David R. Jacques, Dennis D. Strouble

Faculty Publications

Within the Department of Defense, with changing missions to counter dynamic and asymmetrical threats, the acquisition workforce strives to maximize capability for joint warfighting. How acquisition professionals measure and select capability improvements for the nation’s weapon systems is a perpetual challenge, made even more complex with constrained defense budgets. This study identifies a method for determining which upgrades should be purchased (production) for which aircraft in the F- 15C fleet by optimizing a capability proxy measure. Each upgrade’s “necessity” for a given mission area was obtained by conducting a survey of over 250 experienced F-15C pilots. The solution presented in …

An Introduction To Agile Development The Outdoors Edge: Case Study, Christopher D. Thames Iv

Masters Theses & Doctoral Dissertations

This project contains a well rounded overview of Microsoft .NET agile development to solve the problem of unsuccessful software development projects. Not only do we look at what was wrong with the traditional plan-driven style of software development, but also how we can mitigate that with agile software development and agile project management methodologies. The main focus initially is to define what agile is and what the principle concepts that are the driving force behind it. Some of these concepts are about shaping the mentality of a developer so that a developer can be the most efficient and effective developer. …

Project Management Tool, Karteek Boyanapalli

Masters Theses & Doctoral Dissertations

In an organization there are many issues regarding project management. Managing the projects and the human resource is becoming difficult day by day. This 'Project Management Tool' is an attempt to solve those issues. It mainly helps project managers to monitor and control projects in an organization effectively. Using this tool superiors can assign projects, modules, tasks to their sub-ordinates and can monitor the status. They can also send E-Mails to their sub-ordinates using the E-Mail generation feature. This project also enables the employees to submit their day-to-day work. This project generates three different reports namely project reports which gives …

2008-12-01 Unm News Minute, University Of New Mexico Communication And Marketing Department

UNM News Minute 2008

No abstract provided.