16,329 research outputs found
Space Propulsion Technology Program Overview
The topics presented are covered in viewgraph form. Focused program elements are: (1) transportation systems, which include earth-to-orbit propulsion, commercial vehicle propulsion, auxiliary propulsion, advanced cryogenic engines, cryogenic fluid systems, nuclear thermal propulsion, and nuclear electric propulsion; (2) space platforms, which include spacecraft on-board propulsion, and station keeping propulsion; and (3) technology flight experiments, which include cryogenic orbital N2 experiment (CONE), SEPS flight experiment, and cryogenic orbital H2 experiment (COHE)
National Security Space Launch
The United States Space Forceās National Security Space Launch (NSSL) program, formerly known as the Evolved Expendable Launch Vehicle (EELV) program, was first established in 1994 by President William J. Clintonās National Space Transportation Policy. The policy assigned the responsibility for expendable launch vehicles to the Department of Defense (DoD), with the goals of lowering launch costs and ensuring national security access to space. As such, the United States Air Force Space and Missile Systems Center (SMC) started the EELV program to acquire more affordable and reliable launch capability for valuable U.S. military satellites, such as national reconnaissance satellites that cost billions per satellite. In March 2019, the program name was changed from EELV to NSSL, which reflected several important features: 1.) The emphasis on āassured access to space,ā 2.) transition from the Russian-made RD-180 rocket engine used on the Atlas V to a US-sourced engine (now scheduled to be complete by 2022), 3.) adaptation to manifest changes (such as enabling satellite swaps and return of manifest to normal operations both within 12 months of a need or an anomaly), and 4.) potential use of reusable launch vehicles. As of August 2019, Blue Origin, Northrop Grumman Innovation Systems, SpaceX, and United Launch Alliance (ULA) have all submitted proposals. From these, the U.S. Air Force will be selecting two companies to fulfill approximately 34 launches over a period of five years, beginning in 2022.
This paper will therefore first examine the objectives for the NSSL as presented in the 2017 National Security Strategy, Fiscal Year 2019, Fiscal Year 2020, and Fiscal Year 2021 National Defense Authorization Acts (NDAA), and National Presidential Directive No. 40. The paper will then identify areas of potential weakness and gaps that exist in space launch programs as a whole and explore the security implications that impact the NSSL specifically. Finally, the paper will examine how the trajectory of the NSSL program could be adjusted in order to facilitate a smooth transition into new launch vehicles, while maintaining mission success, minimizing national security vulnerabilities, and clarifying the defense acquisition process.No embargoAcademic Major: EnglishAcademic Major: International Studie
The Apollo spacecraft: A chronology volume 4, 21 January 1966 - 13 July 1974
This final volume of the chronology is divided into three parts: (1) preparation for flight, the accident, and investigation; (2) recovery, spacecraft redefinition, and the first manned flight; and (3) man circles the moon, the Eagle lands, and manned space exploration. Congressional documents, official correspondence, government and contractor reports, memoranda, working papers, and minutes of meetings were used as primary sources. A relatively few entries are based on press releases and newspaper and magazine articles
Systems design analysis applied to launch vehicle configuration
As emphasis shifts from optimum-performance aerospace systems to least lift-cycle costs, systems designs must seek, adapt, and innovate cost improvement techniques in design through operations. The systems design process of concept, definition, and design was assessed for the types and flow of total quality management techniques that may be applicable in a launch vehicle systems design analysis. Techniques discussed are task ordering, quality leverage, concurrent engineering, Pareto's principle, robustness, quality function deployment, criteria, and others. These cost oriented techniques are as applicable to aerospace systems design analysis as to any large commercial system
Assessment of the NASA Flight Assurance Review Program
The NASA flight assurance review program to develop minimum standard guidelines for flight assurance reviews was assessed. Documents from NASA centers and NASA headquarters to determine current design review practices and procedures were evaluated. Six reviews were identified for the recommended minimum. The practices and procedures used at the different centers to incorporate the most effective ones into the minimum standard review guidelines were analyzed and guidelines for procedures, personnel and responsibilies, review items/data checklist, and feedback and closeout were defined. The six recommended reviews and the minimum standards guidelines developed for flight assurance reviews are presented. Observations and conclusions for further improving the NASA review and quality assurance process are outlined
AEGIS Platforms: The Potential Impact of Open Architecture in Sustaining Engineering
Sponsored Report (for Acquisition Research Program)This proof-of-concept case study analyzes the potential benefits of open architecture (OA) in the AEGIS software maintenance and upgrade process. In a multi-phased approach, the Knowledge value Added/Real-Options (KVA+RO) framework was applied to sustaining engineering on specific AEGIS software processes.Naval Postgraduate School Acquisition Research ProgramApproved for public release; distribution is unlimited
Testbed para aplicaƧƵes e serviƧos 5G
With 5G technologies growing, there is the need to adopt the NFV paradigm to
align with the demands of a 5G environment. This entails the decoupling of hardware
from the functions it provides, expediting service development. However, the
adoption of NFV raises many challenges, one of which is the validation of Virtualized
Network Functions. 5GASP is a European project that aims to shorten the
idea-to-market process by creating a fully automated and self-service 5G testbed.
In alignment with 5GASPās objectives, this dissertation seeks to design tests for the
validation of Network Applications used within a 5G environment. Furthermore,
the Service-Based Architecture offers the NEF, which enables external application
access to 5G core functions. With these concepts in mind, the solution provided by
this dissertation uses NEF to verify whether a Network Application can correctly
interact with a 5G Network. This is achieved by integrating NEF into the validation
pipeline of 5GASP and developing tests to assess the behavior of Network
Applications. In summary, this document presents the designed architecture and
the implementation of these mechanisms, along with their respective results and
outcomes.Com o crescimento das tecnologias 5G, hĆ” a necessidade de adotar o paradigma
NFV para responder Ć s necessidades de um ambiente 5G, o que leva Ć separaĆ§Ć£o do
hardware das funƧƵes que ele fornece, acelerando o desenvolvimento de serviƧos.
No entanto, a adoĆ§Ć£o de NFV traz muitos desafios, um dos quais Ć© a validaĆ§Ć£o
das VNF. O 5GASP Ć© um projeto europeu que visa a encurtar o processo de
ideia-ao-mercado, criando um ambiente de teste 5G totalmente automatizado. Em
alinhamento com os objetivos do 5GASP, esta dissertaĆ§Ć£o procura criar testes para
a validaĆ§Ć£o de Network Applications usadas em ambiente 5G. AlĆ©m disso, a Arquitetura
Baseada em ServiƧos oferece o NEF, que permite o acesso de aplicaƧƵes
externas Ć s funƧƵes da rede 5G. Com estes conceitos em mente, a soluĆ§Ć£o apresentada
por esta dissertaĆ§Ć£o utiliza o NEF para verificar se uma Network Application
consegue interagir corretamente com uma rede 5G. Isto Ʃ alcanƧado integrando
o NEF no pipeline de validaĆ§Ć£o do 5GASP e desenvolvendo testes para avaliar o
comportamento das Network Applications. No geral, este documento apresenta a
arquitetura definida e a implementaĆ§Ć£o desses mecanismos, juntamente com seus
respectivos resultados.Mestrado em Engenharia de Computadores e TelemƔtic
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System-level key performance indicators for building performance evaluation
Quantifying building energy performance through the development and use of key performance indicators (KPIs) is an essential step in achieving energy saving goals in both new and existing buildings. Current methods used to evaluate improvements, however, are not well represented at the system-level (e.g., lighting, plug-loads, HVAC, service water heating). Instead, they are typically only either measured at the whole building level (e.g., energy use intensity) or at the equipment level (e.g., chiller efficiency coefficient of performance (COP)) with limited insights for benchmarking and diagnosing deviations in performance of aggregated equipment that delivers a specific service to a building (e.g., space heating, lighting). The increasing installation of sensors and meters in buildings makes the evaluation of building performance at the system level more feasible through improved data collection. Leveraging this opportunity, this study introduces a set of system-level KPIs, which cover four major end-use systems in buildings: lighting, MELs (Miscellaneous Electric Loads, aka plug loads), HVAC (heating, ventilation, and air-conditioning), and SWH (service water heating), and their eleven subsystems. The system KPIs are formulated in a new context to represent various types of performance, including energy use, peak demand, load shape, occupant thermal comfort and visual comfort, ventilation, and water use. This paper also presents a database of system KPIs using the EnergyPlus simulation results of 16 USDOE prototype commercial building models across four vintages and five climate zones. These system KPIs, although originally developed for office buildings, can be applied to other building types with some adjustment or extension. Potential applications of system KPIs for system performance benchmarking and diagnostics, code compliance, and measurement and verification are discussed
Calm before the storm: the challenges of cloud computing in digital forensics
Cloud computing is a rapidly evolving information technology (IT) phenomenon. Rather than procure, deploy and manage a physical IT infrastructure to host their software applications, organizations are increasingly deploying their infrastructure into remote, virtualized environments, often hosted and managed by third parties. This development has significant implications for digital forensic investigators, equipment vendors, law enforcement, as well as corporate compliance and audit departments (among others). Much of digital forensic practice assumes careful control and management of IT assets (particularly data storage) during the conduct of an investigation. This paper summarises the key aspects of cloud computing and analyses how established digital forensic procedures will be invalidated in this new environment. Several new research challenges addressing this changing context are also identified and discussed
Shuttle Ground Operations Efficiencies/Technologies (SGOE/T) study. Volume 2: Ground Operations evaluation
The Ground Operations Evaluation describes the breath and depth of the various study elements selected as a result of an operational analysis conducted during the early part of the study. Analysis techniques used for the evaluation are described in detail. Elements selected for further evaluation are identified; the results of the analysis documented; and a follow-on course of action recommended. The background and rationale for developing recommendations for the current Shuttle or for future programs is presented
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