Using task analysis to understand the Data System Operations Team

The Data Systems Operations Team (DSOT) currently monitors the Multimission Ground Data System (MGDS) at JPL. The MGDS currently supports five spacecraft and within the next five years, it will support ten spacecraft simultaneously. The ground processing element of the MGDS consists of a distributed UNIX-based system of over 40 nodes and 100 processes. The MGDS system provides operators with little or no information about the system's end-to-end processing status or end-to-end configuration. The lack of system visibility has become a critical issue in the daily operation of the MGDS. A task analysis was conducted to determine what kinds of tools were needed to provide DSOT with useful status information and to prioritize the tool development. The analysis provided the formality and structure needed to get the right information exchange between development and operations. How even a small task analysis can improve developer-operator communications is described, and the challenges associated with conducting a task analysis in a real-time mission operations environment are examined

Hearing with the eyes: A distributed cognition perspective on guitar song imitation

Many guitarists learn to play by imitating recordings. This style of learning allows guitarists to master both new songs and new techniques. To imitate a song, a guitarist repeatedly listens to a song recording until the entire song, or the desired portion of that song, can be reproduced by the guitarist. This kind of imitation can be a very difficult process particularly if the recorded guitarist plays fast and other instruments are involved. Besides the difficulty in hearing the guitar music, the many different ways to finger and articulate the same notes and chords on a guitar, can also make playing the music difficult. In this paper, we describe some of the knowledge guitarists use to minimize these difficulties. We then propose an external representation that guitarists can use to unload some of the cognitive burden imposed by the imitation process. This external representation — the bar chord — transform many of the imitation activities from those requiring both internal computations and memory to those that require the guitarist to merely look and see the desired results. Moreover, bar chords facilitate the social distribution of these individual benefits. This research contributes to the growing field of distributed cognition and to our understanding of both internal and external representations used during music learning and improvisation

Global Forest Decimal Classification (GFDC)

The English and German sections are provides as two separate files

Making adaptable systems work for mission operations: A case study

The Advanced Multimission Operations System (AMMOS) at NASA's Jet Propulsion Laboratory is based on a highly adaptable multimission ground data system (MGDS) for mission operations. The goal for MGDS is to support current flight project science and engineering personnel and to meet the demands of future missions while reducing associated operations and software development costs. MGDS has become a powerful and flexible mission operations system by using a network of heterogeneous workstations, emerging open system standards, and selecting an adaptable tools-based architecture. Challenges in developing adaptable systems for mission operations and the benefits of this approach are described

HIV/AIDS Related Stigma in Sub-Saharan Africa: Context and Consequences

While HIV infection has been a worldwide epidemic, minority and poor rural groups the world over have been disproportionately affected by the disease. People of color have been most affected, particularly in rural areas of sub-Saharan Africa and the United States. HIV/AIDS is a highly stigmatized disease, and the stigma attached to the disease has fed into, and in many ways strengthened, pre-existing stigma and prejudice against certain groups in the society. This paper gives an analysis of factors that create and sustain such stigma in rural communities, with particular reference to Nigeria, which is Africa\u27s most populous country. The paper offers a participatory ecological model for community intervention. The human immunodeficiency viral (HIV) disease is a severe and progressive chronic illness that is a major source of excessive morbidity and mortality worldwide. Symptomatic HIV disease has a significant impact on the communities and lives of both infected individuals and their families. While HIV disease affects all nations, ethnic groups, communities and people of color have been most affected, particularly in rural areas of sub-Saharan Africa and the United States (CDC, 2002; Leonard, 2001; HIV/AIDS in Africa, 2002; Pan African New Agency, 2001; UNAIDS, 2001; UNAIDS/WHO, 1999; World Bank, 2002). Worldwide, the mental health consequences of the epidemic are substantial (WHO, 2001). Sowell et al. (1996) describe the spread of the disease to rural communities as a part of the second wave of the epidemic. AIDS stigma refers to prejudice, discounting, discrediting and discrimination directed at people perceived to have AIDS or HIV, as well as the individuals, groups and communities with which they are associated. The effect of intense stigma and discrimination against people with HIV/AIDS plays a major role in psychological stress, including disorders such as depression and anxiety, particularly in the rural areas. Stigma also hampers preventive efforts as people afflicted with the disease are reluctant to reveal their serostatus. Relationships are very important to people in the rural areas, therefore, community intervention for HIV/AIDS should employ a participatory approach aimed at building support networks for people living with HIV/AIDS (PLWHA) in the rural areas. Such a network will provide group support needed to function under a hostile atmosphere of stigma

Failure Analysis Results and Corrective Actions Implemented for the EMU 3011 Water in the Helmet Mishap

During EVA (Extravehicular Activity) No. 23 aboard the ISS (International Space Station) on 07/16/2013 water entered the EMU (Extravehicular Mobility Unit) helmet resulting in the termination of the EVA (Extravehicular Activity) approximately 1-hour after it began. It was estimated that 1.5-L of water had migrated up the ventilation loop into the helmet, adversely impacting the astronauts hearing, vision and verbal communication. Subsequent on-board testing and ground-based TT and E (Test, Tear-down and Evaluation) of the affected EMU hardware components led to the determination that the proximate cause of the mishap was blockage of all water separator drum holes with a mixture of silica and silicates. The blockages caused a failure of the water separator function which resulted in EMU cooling water spilling into the ventilation loop, around the circulating fan, and ultimately pushing into the helmet. The root cause of the failure was determined to be ground-processing short-comings of the ALCLR (Airlock Cooling Loop Recovery) Ion Filter Beds which led to various levels of contaminants being introduced into the Filters before they left the ground. Those contaminants were thereafter introduced into the EMU hardware on-orbit during ALCLR scrubbing operations. This paper summarizes the failure analysis results along with identified process, hardware and operational corrective actions that were implemented as a result of findings from this investigation

Failure Analysis Results and Corrective Actions Implemented for the Extravehicular Mobility Unit 3011 Water in the Helmet Mishap

Water entered the Extravehicular Mobility Unit (EMU) helmet during extravehicular activity (EVA) no. 23 aboard the International Space Station on July 16, 2013, resulting in the termination of the EVA approximately 1 hour after it began. It was estimated that 1.5 liters of water had migrated up the ventilation loop into the helmet, adversely impacting the astronaut's hearing, vision, and verbal communication. Subsequent on-board testing and ground-based test, tear-down, and evaluation of the affected EMU hardware components determined that the proximate cause of the mishap was blockage of all water separator drum holes with a mixture of silica and silicates. The blockages caused a failure of the water separator degassing function, which resulted in EMU cooling water spilling into the ventilation loop, migrating around the circulating fan, and ultimately pushing into the helmet. The root cause of the failure was determined to be ground-processing shortcomings of the Airlock Cooling Loop Recovery (ALCLR) Ion Filter Beds, which led to various levels of contaminants being introduced into the filters before they left the ground. Those contaminants were thereafter introduced into the EMU hardware on-orbit during ALCLR scrubbing operations. This paper summarizes the failure analysis results along with identified process, hardware, and operational corrective actions that were implemented as a result of findings from this investigation

Fall 2022 School of Graduate Studies Newsletter

Table of Contents Message from the Associate Dean Ph.D. in Aviation News MS in Aviation News MSOSM News MSUS News Eagle News Eagle Influence Scholarly Activity Scholars in Researchhttps://commons.erau.edu/db-sgs-newletter/1021/thumbnail.jp

May 2022 School of Graduate Studies Newsletter

Message from the Associate Dean Ph.D. in Aviation News MS in Aviation News MSOSM News MSUS News Eagle News Forever an Eagle College of Aviation Academic Awards Scholarly Activity Daytona Beach Campus Nhttps://commons.erau.edu/db-sgs-newletter/1020/thumbnail.jp