Thesis (Ed. D.)--Illinois State University, 2006. / Title from title page screen, viewed on April 27, 2007. Dissertation Committee: Paul Baker (chair), Dianne Ashby, Jeffrey Nelson, William Rau. Includes bibliographical references (leaves 206-213) and abstract. Also available in print.

Transient stability analysis is necessary for the planning, operation, and control of power systems. However, its mathematical modeling and time-domain solution is computationally onerous and has attracted the attention of power systems experts and simulation specialists for decades. The ultimate promised goal has been always to perform this simulation as fast as real-time for realistic-sized systems. In this thesis, methods to speedup transient stability simulation for large-scale power systems are investigated. The research reported in this thesis can be divided into two parts. First, real-time simulation on a general-purpose simulator composed of CPU-based computational nodes is considered. A novel approach called Instantaneous Relaxation (IR) is proposed for the real-time transient stability simulation on such a simulator. The motivation of proposing this technique comes from the inherent parallelism that exists in the transient stability problem that allows to have a coarse grain decomposition of resulting system equations. Comparison of the real-time results with the off-line results shows both the accuracy and efficiency of the proposed method. In the second part of this thesis, Graphics Processing Units (GPUs) are used for the first time for the transient stability simulation of power systems. Data-parallel programming techniques are used on the single-instruction multiple-date (SIMD) architecture of the GPU to implement the transient stability simulations. Several test cases of varying sizes are used to investigate the GPU-based simulation. The simulation results reveal the obvious advantage of using GPUs instead of CPUs for large-scale problems. In the continuation of part two of this thesis the application of multiple GPUs running in parallel is investigated. Two different parallel processing based techniques are implemented: the IR method, and the incomplete LU factorization based approach. Practical information is provided on how to use multi-threaded programming to manage multiple GPUs running simultaneously for the implementation of the transient stability simulation. The implementation of the IR method on multiple GPUs is the intersection of data parallelism and program-level parallelism, which makes possible the simulation of very large-scale systems with 7020 buses and 1800 synchronous generators. / Energy Systems

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Den lilla gruppen, stödundervisning, eller vad man nu kallar den är ett arbetssätt som en del skolor arbetar med för att ge barn i behov av extrastöd en lämplig form av undervisning. Den lilla gruppen bildas genom att elever från olika klasser samlas i ett särskilt undervisningsrum tillsammans med en lärare/pedagog/specialpedagog. Vilka är då de elever som placeras i den lilla gruppen och är dessa hjälpta av denna undervisningsform? I den undersökning jag genomförde genom intervjuer, fanns det två grupper av elever med svårigheter. Den ena gruppen bestod av elever med invandrarbakgrund och gick i liten grupp för att få svenskundervisning. Den andra gruppen bestod av elever som hade problem med matematiken. Jag kom fram till att eleverna i båda dessa grupper var hjälpta av arbetet i liten grupp. Det tyckte både de själva och pedagogerna. Jag sände också ut enkäter till rektorer för att se om de använde sig av arbetssättet liten grupp och vilka problem eleverna i dessa hade. Utifrån svaren har jag försökt se om dessa elever har möjlighet att bli hjälpta i liten grupp genom att läsa om problemen. De problem rektorerna angav var DAMP, ADHD, autism och koncentrationssvårigheter. Utifrån det jag läst om dessa problem kan jag se att vissa är hjälpta av arbetet i liten grupp medan andra inte är det.

Archaeology in Bolivia has two strong tendencies: nationalism and regionalism. The proposal aims for an academic reconstruction and expansion of this science in order to develop new scientific criteria, that can be institutionalized and become normative to the whole country to cover the expectations of different regions with regard to its past. A fundamental aspect of providing Bolivian archaeological research with new perspectives is the study of formation and development of Andean central places of historic, infrastructural and ritual importance, such Huari, Quillacas, Sevaruyo, Pampa Aullagas and San Miguel de Uruquilla. Research conducted in the south basin of the Lake Poopo identifies evidence of early settlement in Huari towards the Late Archaic period (approximately 4000 to 2000 BC) and the Formative (2000 BC to AD 300), when the first villages were established. This indicates that the formation of agricultural towns was produced by consolidation of multiethnic central places that first consisted of ayllus, socio-dynamic units that gathered together settlers from different regions that simultaneously formed an ample network of centres interconnecting the Andean complex geography, interweaving their cultural diversity owing to the common ideology of Tiwanaku. Routes and llama caravans (llama trekking) integrated this network of central places. As indicated by surveys and excavations, convergence of groups from different regions has been recognized in rests of material culture as shown in the ceramic distribution: Local Tiwanaku, Tiwanaku from Cochabamba, Yura, Huruquilla, Puqui, Mojocoya and remains of festivities at the centres during redistribution ceremonies, as well as ritual offers during the Early Regional Development period (300 to AD 900). This dynamic and preponderant ideology was completely transformed during Late Regional Developments (900 to AD 1460) when a series of regional conflicts determined the formation of the regional confederation known as Quillacas- Azanaques. At the time of the Inka Conquest (1460– AD 1530), the Lake Poopo basin was integrated into the Tawantinsuyo region through the implementation of the Royal Road and construction of Paria, Quillacas, San Miguel de Uruquilla and the Sevaruyo lodgings. During the Colonial (1530 - 1825) and Republican periods (1825 - ), the Spaniards made changes that imply a deterioration of the socio-political structures of the ayllus, its territorial fragmentation and creation of new reductions for mining operations. Recent archaeological research supports the proposition that populated centres in the Andean region of Bolivia were adapted to take advantage of the ecological variability through the social construction of the ayllu and the markas, centres that maintain dynamics, fluctuants and confluence in productive and ritual places.

Bakgrund: Självskadebeteendet betraktas som ett folkhälsoproblem vilket har uppmärksammats mer på senare tid. Vårdpersonal möter denna patientgrupp inom olika vårdenheter då patienter med självskadebeteende kommer in på akutmottagningar för skador de vållat själv. Syftet var att beskriva faktorer som påverkar vårdpersonalens attityder gentemot patienter med självskadebeteende. Metod: Studien gjordes som en litteraturstudie där datainsamling genomfördes i databaserna Cinahl och PsycINFO. En granskning gjordes av sju artiklar som svarade på studiens syfte. Resultat: Betydande faktorer visade att vårdpersonalen yttrar olika emotionella uttryck så som frustration och medkänsla i kontakt med patienter med ett självskadebeteende, och andra avgörande faktorer som påverkar vårdpersonalens attityder, vilket kunde vara brist på tid och otillräcklig kompetens. Diskussion: För att kunna förstå denna patientgrupp bör underliggande faktorer belysas, vilket kan då påverka vårdpersonalens attityder gentemot patienter med självskadebeteende. Slutsats: Det finns ett behov av att identifiera faktorer som skapar negativa attityder inom sjukvården. Studier bekräftar att vårdpersonalen önskar ökad kompetensutbildning. / Background: Self-injury regarded as a public health problem which has attracted attention more recently. Caregivers face this group of patients in different care units where patients with self-injury come into the emergency room for injuries they caused themselves. Aim: The aim was to describe factors that affect nursing staff attitudes to patients with self-injury. Method: The study was done as a literature in which data collection was conducted in the databases Cinahl and PsycINFO. An examination was made of seven articles that responded to the study purpose. Results: Significant factors revealed that caregivers respond different emotional expressions as frustration and compassion in contact with patients with a self-injury, and other crucial factors that influence health professionals' attitudes, which could be a shortage of time and insufficient skills. Discussion: In order to understand this population should be highlighted underlying factors, which may then affect the health professionals' attitudes towards patients with self-injury. Conclusion: There is a need to identify factors that create negative attitudes in health care. Studies confirm that nursing staff would increase skills training.

Purpose: The purpose of the study is to find out what mathematical content primary school children encounter in their free options at school. Through observation, the study defines mathematical areas that primary school students encounter in their free options at school. We want the study to show the reader the mathematics that students continuously meet without associating it with regular mathematics as taught in school. A number of mathematical areas have been defined in the analysis of the observations. These areas have subsequently been discussed more thoroughly. Finally, the areas have been arranged in a grid system to clarify the results. In our study, we have discovered that mathematics exists in all the observed situations the students participated in. We believe that observation as a method can give teachers a tool for helping students associate practical actions during their free options with the more theoretical aspects of formal teaching of mathematics. We discuss this further in the study.

The objective of the proposed research is to develop an analytical model that predicts performance and power for many-core architecture and further propose a mechanism, which leverages the analytical model, to enable energy-efficient execution of an application. The key insight of the model is to investigate and quantify a complex relationship that exists between the thread-level parallelism and memory-level parallelism for an application on a given many-core architecture. Two metrics are proposed: memory warp parallelism (MWP), which refers to the number of overlapping memory accesses per core, and computation warp parallelism (CWP), which characterizes an application type. By using these metrics in addition to the architectural and application parameters, the overall application performance is produced. The model uses statically-available parameters such as instruction-mixture information and input-data size, and the prediction accuracy is 13.3% for the GPU-computing benchmarks. Another important aspect of using many-core architecture is reducing peak power and achieving energy savings. By using the proposed integrated power and performance (IPP) framework, the results showed that different optimization points exist for GPU architecture depending on the application type. The work shows that by activating fewer cores, 10.99% of run-time energy consumption can be saved for the bandwidth-limited benchmarks, and a projection of 25.8% energy savings is predicted when power-gating at core level is employed. Finally, the model is shifted to throughput using OpenCL for targeting more variety of processors. First, multiple outputs relating to performance are predicted, including upper-bound and lower-bound values. Second, by using the model parameters, an application can be categorized into a different category, each with its own suggestions for improving performance and energy efficiency. Third, the bandwidth saturation point accuracy is significantly improved by considering independent memory accesses and updating the performance model. Furthermore, a trade-off analysis using architectural and application parameters is straightforward, which provides more insights to improve energy efficiency. In the future, a computer system will contain hundreds of heterogeneous cores. Hence, it is mandatory that a workload gets scheduled to an efficient core or distributed on both types of cores. A preliminary work by using the analytical model to do scheduling between CPU and GPU is demonstrated in the appendix. Since profiling phase is not required, the kernel code can be transformed to run more efficiently on the specific architecture. Another extension of the work regarding the relationship between the speed-up and energy efficiency is mathematically derived. Finally, future research ideas are presented regarding the usage of the model for programmer, compiler, and runtime for future heterogeneous systems.

Current physiotherapy practice relies on visual observation of the patient for diagnosis and assessment. The assessment process can potentially be automated to improve accuracy and reliability. This thesis proposes a method to recover patient joint angles and automatically extract movement profiles utilizing small and lightweight body-worn sensors. Joint angles are estimated from sensor measurements via the extended Kalman filter (EKF). Constant-acceleration kinematics is employed as the state evolution model. The forward kinematics of the body is utilized as the measurement model. The state and measurement models are used to estimate the position, velocity and acceleration of each joint, updated based on the sensor inputs from inertial measurement units (IMUs). Additional joint limit constraints are imposed to reduce drift, and an automated approach is developed for estimating and adapting the process noise during on-line estimation. Once joint angles are determined, the exercise data is segmented to identify each of the repetitions. This process of identifying when a particular repetition begins and ends allows the physiotherapist to obtain useful metrics such as the number of repetitions performed, or the time required to complete each repetition. A feature-guided hidden Markov model (HMM) based algorithm is developed for performing the segmentation. In a sequence of unlabelled data, motion segment candidates are found by scanning the data for velocity-based features, such as velocity peaks and zero crossings, which match the pre-determined motion templates. These segment potentials are passed into the HMM for template matching. This two-tier approach combines the speed of a velocity feature based approach, which only requires the data to be differentiated, with the accuracy of the more computationally-heavy HMM, allowing for fast and accurate segmentation. The proposed algorithms were verified experimentally on a dataset consisting of 20 healthy subjects performing rehabilitation exercises. The movement data was collected by IMUs strapped onto the hip, thigh and calf. The joint angle estimation system achieves an overall average RMS error of 4.27 cm, when compared against motion capture data. The segmentation algorithm reports 78% accuracy when the template training data comes from the same participant, and 74% for a generic template.

The strain on modern electrical power systems has led to an ever-increasing utilization of new information and communication technologies (ICT) to improve their efficiency and reliability. Wide area monitoring and control (WAMC) systems offer many opportunities to improve the real-time situational awareness in the power system. These systems are essen-tially SCADA systems but with continuous streaming of measurement data from the power system. The quality of WAMC systems and the applications running on top of them are heavily, but not exclusively, dependent on the underlying non-functional quality of the ICT systems. From an ICT perspective, the real-time nature of WAMC systems makes them susceptible to variations in the quality of the supporting ICT systems. The non-functional qualities studied as part of this research are performance, interoperability and cyber security. To analyze the performance of WAMC ICT systems, WAMC applications were identified, and their requirements were elicited. Furthermore, simulation models capturing typical utility communication infrastructure architectures were implemented. The simulation studies were carried out to identify and characterize the latency in these systems and its impact on data quality in terms of the data loss. While performance is a major and desirable quality, other non-functional qualities such as interoperability and cyber security have a significant impact on the usefulness of the sys-tem. To analyze these non-functional qualities, an enterprise architecture (EA) based framework for the modeling and analysis of interoperability and cyber security, specialized for WAMC systems, is proposed. The framework also captures the impact of cyber security on the interoperability of WAMC systems. Finally, a prototype WAMC system was imple-mented to allow the validation of the proposed EA based framework. The prototype is based on existing and adopted open-source frameworks and libraries. The research described in this thesis makes several contributions. The work is a systematic approach for the analysis of the non-functional quality of WAMC ICT systems as a basis for establishing the suitability of ICT system architectures to support WAMC applications. This analysis is accomplished by first analyzing the impact of communication architectures for WAMC systems on the latency. Second, the impact of these latencies on the data quali-ty, specifically data currency (end to end delay of the phasor measurements) and data in-completeness (i.e., the percentage of phasor measurements lost in the communication), is analyzed. The research also provides a framework for interoperability and cyber security analysis based on a probabilistic Monte Carlo enterprise architecture method. Additionally, the framework captures the possible impact of cyber security on the interoperability of WAMC data flows. A final result of the research is a test bed where WAMC applications can be deployed and ICT architectures tested in a controlled but realistic environment. / <p>QC 20130218</p>