An Architectural Framework for Performance Analysis: Supporting the Design, Configuration, and Control of DIS /HLA Simulations

Technology advances are providing greater capabilities for most distributed computing environments. However, the advances in capabilities are paralleled by progressively increasing amounts of system complexity. In many instances, this complexity can lead to a lack of understanding regarding bottlenecks in run-time performance of distributed applications. This is especially true in the domain of distributed simulations where a myriad of enabling technologies are used as building blocks to provide large-scale, geographically disperse, dynamic virtual worlds. Persons responsible for the design, configuration, and control of distributed simulations need to understand the impact of decisions made regarding the allocation and use of the logical and physical resources that comprise a distributed simulation environment and how they effect run-time performance. Distributed Interactive Simulation (DIS) and High Level Architecture (HLA) simulation applications historically provide some of the most demanding distributed computing environments in terms of performance, and as such have a justified need for performance information sufficient to support decision-makers trying to improve system behavior. This research addresses two fundamental questions: (1) Is there an analysis framework suitable for characterizing DIS and HLA simulation performance? and (2) what kind of mechanism can be used to adequately monitor, measure, and collect performance data to support different performance analysis objectives for DIS and HLA simulations? This thesis presents a unified, architectural framework for DIS and HLA simulations, provides details on a performance monitoring system, and shows its effectiveness through a series of use cases that include practical applications of the framework to support real-world U.S. Department of Defense (DoD) programs. The thesis also discusses the robustness of the constructed framework and its applicability to performance analysis of more general distributed computing applications

Evaluating Obselete Inventory Policies in a Hospital\u27s Supply Chain

Numerous organizations are currently facing inventory management problems including distributing inventory on time and maintaining the appropriate inventory level to satisfy the end user. Organizations understand the importance of inventory accuracy as any error will increase the purchasing and holding costs affecting investment decisions. Lack of information about effective measures that will allow management to make important business decisions motivated this research to identify a decision criterion for warehouse management. A feasible solution of calculating the carrying cost ratio from purchasing and holding cost is the main objective of this thesis. The carrying cost ratio will allow managers to make critical decisions on supply-chain management. Similar to the carrying cost ration, this thesis also provides a methodology for warehouse management using inventory turns that can be used to identify obsolete inventory. Friedman’s Rank test was performed to validate the decision using primary turns for the dataset obtained from a local hospital. Recommendations have been made to the hospital to facilitate their supply chain that will result in the reduction of excessive inventory. A reduced carrying cost ratio demonstrates consolidating commodities into fewer facilities. The future benefits for the current organization include a reduce building and facility costs, decrease in annual operating budgets, reduction in warehouse operational cost, improvement in labor productivity, warehouse space utilization, and establish performance measures. In conclusion, findings from this research will allow organization to move towards the one-echelon model known as Just-In-Time (JIT) system

Supporting Social-Emotional Learning In Early Childhood Education

Social-emotional learning is a critical component of early childhood education because of how many students lack appropriate social-emotional (SEL) skills. While this has always been an important component of children’s growth and development, the COVID-19 pandemic in 2020 intensified the need for the implementation of social-emotional learning curriculum, lessons, and conversations in schools and homes. Research describes the necessity of social-emotional learning and the importance of considering diverse needs and cultures, yet teachers and parents are lacking support to make this area part of each day at school and home. Students need instruction in SEL skills to help prepare them for interactions with others both inside and outside of the classroom. Research shows how social-emotional learning can be integrated with academics through routines such as interactive read-alouds. Children’s literature provides a wealth of opportunity to support social-emotional learning and conversations among students and teachers or parents. The creative and intentional use of children’s literature can support both academic and social-emotional learning at the same time. Research also describes how support and resources for teaching SEL is often lacking in schools. It is imperative that educators and caregivers are equipped with knowledge about why social-emotional learning is critical for the children they are working with and that they have support and resources to implement high-quality SEL lessons and conversations

Visible-light photocatalytic intramolecular cyclopropane ring expansion

Described herein is a new visible-light photocatalytic strategy for the synthesis of enantioenriched dihydrofurans and cyclopentenes by an intramolecular nitro cyclopropane ring expansion reaction. Mechanistic studies and DFT calculations are used to elucidate the key factors in this new ring expansion reaction, and the need for the nitro group on the cyclopropaneThe Spanish Government (CTQ2015-64561-R, CTQ2014-59544-P) and the European Research Council (ERC-CG,contract number:647550) are acknowledge

Synthesis and reactions of donor cyclopropanes: efficient routes to cis- and trans-tetrahydrofurans

A detailed study on the synthesis and reactions of silylmethylcyclopropanes is reported. In their simplest form, these donor-only cyclopropanes undergo Lewis acid promoted reaction to give either cis- or trans-tetrahydrofurans, with the selectivity being reaction condition-dependant. The adducts themselves are demonstrated to be an important scaffold for structural diversification. The combination of a silyl-donor group in a donor-acceptor cyclopropane with novel acceptor groups is also discussed

A Synthetic Strategy toward Eight-Membered Cyclic Amines by Cycloetherification and Claisen Rearrangement

Eight-membered nitrogen-containing heterocycles were straightforwardly produced by a nickel-catalyzed cycloetherification and subsequent Claisen rearrangement of secondary and tertiary alcohols. In particular, a one-pot transformation was achieved with tertiary alcohols in moderate to good yields. This operationally simple reaction is tolerant of many functional groups and applicable to the synthesis of various medium-sized ring nitrogen-containing heterocycles