A vibration model was developed for CubeSats inside the Poly-Picosatellite Orbital Deployer (P-POD). CubeSats are fixed in the Z axis of deployers, and therefore resonate with deployer peaks. CubeSats generally start fixed in the X and Y axes, and then settle into an isolated position. CubeSats do not resonate with deployers after settling into an isolated position. Experimental data shows that the P-POD amplifies vibration loads when CubeSats are fixed in the deployer, and vibration loads are reduced when the CubeSats settle into an isolated position. A concept for a future deployer was proposed that isolates CubeSats from the deployer at the rail interface using viscoelastic foam sandwiched in the deployer rails. By creating an isolator frequency far below the deployer resonant frequency, CubeSats loads are not amplified at the deployer’s resonant peak. Feasibility tests show that CubeSat vibration loads can be reduced to 50% of the vibration input in certain cases. Testing also shows that it is much easier to define vibration loads for isolated CubeSats than CubeSats in the current P-POD.

No description available.

ITC/USA 2006 Conference Proceedings / The Forty-Second Annual International Telemetering Conference and Technical Exhibition / October 23-26, 2006 / Town and Country Resort & Convention Center, San Diego, California / A rocket launch, as high dynamics target, was used to demonstrate X-band tracking and also to verify high bit rate frequency planning while demonstrating significant bandwidth reduction with IRIG standard advanced modulation methods. X-band tracking by a modified 8-foot mobile telemetry antenna was excellent. Three separate S-band transmitters with three separate wraparound antennas were launched as a piggyback payload on an Enhanced Orion sounding rocket at White Sands Missile Range (WSMR) to compare the performance of 10 Mbs and 20 Mbs bit error rate (BER) pattern data transmission from CPFSK, FQPSK-JR and ARTM CPM modulation formats under high dynamic conditions. The test is more remarkable in that another S-band wideband spread spectrum signal was also transmitted with good success. These results show that all three modulation methods performed well during ignition and liftoff, low aspect angle (receiving through the rocket motor plume during ascent from a tracker near the launch pad), spin stabilization antenna lobe fades and payload tumbling. Spectrum pictures are provided to show the dramatic reduction in transmission bandwidth from CPFSK to FQPSK-JR to ARTM CPM. Confirmation of the preflight RF adjacent channel interference planning procedures from IRIG 106-05 is described by spectrum pictures and data quality measurements.

L’utilisation de robots collaboratifs dans l’industrie de production est en plein essor. Ces robots, dont la puissance est limitée, sont dotés de capteurs leur permettant de détecter la présence d’obstacles, afin de garantir la sécurité des humains se trouvant aux alentours. On s’intéresse dans cette thèse à l’utilisation de systèmes redondants, collaboratifs et mobiles (bras articulés montés sur plateformes mobiles), dans un environnement de production aéronautique peuplé d’humains, pour la réalisation d’opérations d’assemblage. Du point de vue des process, l’utilisation de ces systèmes, souvent beaucoup moins imposants et rigides que leurs homologues non collaboratifs, est jalonnée de défis. La grande souplesse mécanique et les faibles couples qui les caractérisent peuvent induire des imprécisions de positionnement et une incapacité à soutenir l’intensité d’une interaction physique. Ce contexte induit également un besoin d’autonomie de ces systèmes, qui sont amenés à travailler dans des environnements en perpétuelle évolution. Dans cette thèse, une formulation de la redondance cinématique est d’abord présentée. Le formalisme associé permet de simplifier l’exploitation de la liberté que ces systèmes possèdent sur le choix des postures à utiliser pour réaliser des tâches de placement statique de l’effecteur. Ce formalisme est ensuite exploité pour améliorer et caractériser le comportement en déformation et la capacité d’application d’efforts des systèmes redondants sériels. Enfin, le sujet de la planification des mouvements de systèmes robotisés dans un environnement dynamique et encombré est considéré. La solution présentée adapte l’algorithme bien connu des Probabilistic RoadMaps pour y inclure une anticipation des trajectoires des obstacles dynamiques. Cette solution permet de planifier des mouvements sécuritaires, peu intrusifs et efficaces, jusqu’à la destination. / Industrial applications involving collaborative robots are regarded with a growing interest. These power-limited systems are embedded with additional sensing capabilities, which allow them to safely work around humans and conquer new industrial grounds. The subject of managing redundant, collaborative and mobile systems, for assembly operations within a human-populated aircraft production environment, is addressed in this thesis. From a process perspective, the use of these smaller and less stiff counterparts of the non-collaborative robots comes with new challenges. Their high mechanical flexibility and weak actuation can cause shortcomings in positioning accuracy or for interaction force sustainment. The ever-changing nature of human-populated environments also requires highly autonomous solutions. In this thesis, a formulation of positional redundancy is presented. It aims at simplifying the exploitation of the freedom redundant manipulators have on static-task-fulfilling postures. The associated formalism is then exploited to characterise and improve the deformational behaviour and the force capacity of redundant serial systems. Finally, the subject of planning motions within cluttered and dynamic environments is addressed. An adaptation of the well-known Probabilistic RoadMaps method is presented – to which obstacles trajectories anticipation has been included. This solution allows to plan safe, efficient and non-intrusive motions to a given destination.

<p>The current study aimed at investigating the concepts of team situation awareness, mental models, and team processes in relation to performance in the complex, dynamic environment of breathing apparatus rescues. Data was collected during exercises at Ågesta training center through questionnaires and after action reviews. 28 firemen and 5 instructors participated in the exercises. Also, a stimulated recall interview was conducted with 2 of the firemen that had participated in one of the exercises. The different data collection methods all indicated that well-developed mental models or a high degree of pre-task knowledge affected performance in a positive way. Moreover, a multiple regression analysis showed that both pre-task knowledge and team processes significantly can predict performance. The results of the analysis of team situation awareness in relation to performance were fairly ambiguous. Therefore, further research is needed to establish the relation between these concepts in the domain at matter.</p>

<p>Det är viktigt med ett effektivt samarbete och en välfungerande kommunikation i dynamiska miljöer, till exempel vid släckningsarbetet av en brand. Bristande kommunikation i en sådan miljö skulle kunna få förödande konsekvenser.</p><p>Denna uppsats bygger på material från studien ”Bridging Cultural Barriers to Collaborative Decision Making in On-Site Operations Coordination Centers”, där 32 svenskar samarbetade i olika lagkonstellationer med att släcka simulerade eldar i mikrovärlden C3Fire.</p><p>Kommunikationsteorier visar på att personer samtalar med varandra efter en viss struktur; deras yttranden tenderar att komma i par, så kallade närhetspar. Denna studie syftade till att undersöka närhetspar i beställningssekvenser, i form av en beställning av vatten och/eller bränsle följd av en bekräftelse. Till sin hjälp hade försöksdeltagarna en datorskärm med en karta samt tillgång till ett e-postverktyg för att kommunicera inom laget. Varje person genomgick åtta spelomgångar, vilket resulterade i totalt 64 spelomgångar. De lag som lyckades släcka elden antogs ha större andel närhetspar i beställningssekvenserna, vilket innebar att de skulle bekräfta varandras beställningar mer kontinuerligt än de lag som inte lyckades släcka elden. För studiet av närhetsparen kategoriserades e-postmeddelandena från samtliga spelomgångar, för att se hur strukturen i kommunikationen såg ut.</p><p>Resultatet visade på att något annat måste ha påverkat de medverkandes prestation, eftersom det inte fanns någon påtaglig skillnad i andelen närhetspar i beställningssekvenserna mellan de olika lagen. Det uppmärksammades att de inte bekräftade varandras beställningar endast genom e-postmeddelanden utan även genom direkta manipulationer. Anledningen till detta antas vara att alla lagmedlemmar blev presenterade samma information på sina datorskärmar, vilket frambringade en mer implicit kommunikation.</p> / <p>Efficient communication and cooperation is important in dynamic environments, for instance in fire-fighting teamwork. A lack of communication in this environment could cause devastating consequences.</p><p>This Master’s thesis is based on material from ”Bridging Cultural Barriers to Collaborative Decision Making in On-Site Operations Coordination Centers”, a study where 32 Swedes collaborated in teams conducting fire-fighting exercises in the micro-world C3Fire.</p><p>Communication theories propose that people talk with each other after a certain structure; their utterances tend to come in pairs, so-called adjacency pairs. The purpose of this study was to examine adjacency pairs in request sequences, in form of a request for water and/or fuel followed by a confirmation. The participants had access to a computer screen with a map together with an e-mail tool, to communicate within the team. Every person participated in eight rounds of the game, which resulted in 64 rounds of the game altogether. The teams who managed to extinguish the fire were assumed to have a larger amount of adjacency pairs in their request sequences than the teams who did not extinguish the fire. For the study of the adjacency pairs, the e-mails were categorized, to see what the structure of the communication looked like.</p><p>The result showed that some other factor must have influenced the participants’ performance, since there was no obvious difference in the amount of the adjacency pairs in the request sequence between the teams. It was observed that the team members did not confirm each other’s requests just by sending e-mail, but also by direct manipulations. The reason for this is assumed to be that every member of the team was shown the same information on his computer screen, which gave rise to a more implicit communication.</p>

Submitted by Daniella Sodre (daniella.sodre@ufpe.br) on 2015-03-10T13:03:19Z No. of bitstreams: 2 license_rdf: 1232 bytes, checksum: 66e71c371cc565284e70f40736c94386 (MD5) Dissertação Bruno Souza.pdf: 3055649 bytes, checksum: 5cedaf83e4e87135a1f22f1bb7c1dd09 (MD5) / Made available in DSpace on 2015-03-10T13:03:19Z (GMT). No. of bitstreams: 2 license_rdf: 1232 bytes, checksum: 66e71c371cc565284e70f40736c94386 (MD5) Dissertação Bruno Souza.pdf: 3055649 bytes, checksum: 5cedaf83e4e87135a1f22f1bb7c1dd09 (MD5) Previous issue date: 2013-09-09 / FACEPE / Ambientes dinâmicos e distribuídos são sistemas descentralizados que fornecem aos usuários recursos de consultas sobre um conjunto de fontes de dados heterogêneas, distribuídas e autônomas (peers). Sistemas de Integração de Dados, Peer Data Management System (PDMS) e Dataspaces são exemplos de tais sistemas. Eles são constituídos por peers que pertencem a um domínio específico e estão ligados entre si por meio de correspondências semânticas. No entanto, um desafio inerente em ambientes dinâmicos e distribuídos é o processo de reformulação de consulta entre um par de peers. Quando um usuário coloca uma consulta em um peer, a fim de adquirir mais informações, a consulta deve ser reformulada de acordo com o esquema dos peers vizinhos. Neste processo podem surgir alguns problemas como a perda semântica e a degradação da consulta. A perda semântica e degradação da consulta são problemas relacionados à perda de conceitos semânticos durante a reformulação. Por outro lado, em um ambiente semanticamente rico, ao invés de uma perda semântica, a consulta pode ter um enriquecimento semântico por meio da agregação de conceitos semanticamente relacionados durante a reformulação. Neste sentido, a consulta do usuário pode ser enriquecida e resultados semânticos mais ricos podem ser recuperados. Critérios de qualidade da informação têm sido usados em alguns trabalhos para avaliar o nível de qualidade dos elementos de um ambiente dinâmico e distribuído como, por exemplo, peers, dados e a resposta da consulta. Estes critérios são medidas dinâmicas proporcionadas pelo sistema e servem como uma pontuação que pode ser constantemente avaliada para obter o nível real de qualidade. Neste trabalho, apresentamos quatro critérios de qualidade da informação que medem a perda e o ganho de conceitos semânticos durante a reformulação da consulta entre os pares de peers. Nós apresentamos um exemplo da nossa abordagem e os algoritmos de avaliação de critérios. Também damos as nossas definições para os problemas de perda semântica e degradação da consulta. Por fim, apresentamos a experimentação que fizemos com o PDMS SPEED e os resultados obtidos. / Dynamic distributed environments are decentralized systems that provide users with querying capabilities over a set of heterogeneous, distributed and autonomous data sources (peers). Data Integration Systems, Peer Data Management Systems (PDMS) and Dataspaces are examples of such systems. They are composed by peers that belong to a specific domain and are linked to each other by correspondences (semantic connections). Nonetheless, a challenge inherent to dynamic distributed environments is the query reformulation process between a pair of peers. When a user poses a query at a peer, in order to acquire more information, the query should be reformulated in accordance with the neighbor peers schema. In this process some problems as semantic loss and query degradation can arise. The semantic loss and query degradation are problems related to the loss of semantic concepts during query reformulation. In the other hand, in such a semantic environment instead of a semantic loss the query can have a semantic enrichment by aggregating semantic related concepts during reformulation. In this sense, the user’s query can be enriched and semantically richer results can be delivered. Information Quality criteria has been used in some works to evaluate the level of quality of the distributed dynamic environment’s elements such as, peers, data and query answer. These criteria are dynamic measures provided by the system and serve as scores that can be constantly evaluated to get the actual level of quality. In this work we present four Information Quality criteria that measure the loss and enrichment of semantic concepts during query reformulation among peers. We present an example of our analysis and the algorithms that implement the evaluation of the presented criteria. We also give our definitions to the semantic loss and query degradation problems. Finally, we present the experimentation we have done with the SPEED PDMS and the obtained results.

La gestion des environnements dynamiques à risques (transports, nucléaire, médecine etc.) progresse tous les jours dans notre société. Leur bonne gestion requiert une fiabilisation des systèmes techniques et organisationnels et nécessite de renforcer de la formation des opérateurs aux compétences non techniques. Notre thèse s’intéresse à ce dernier axe. Dans la littérature, le concept de compétences non techniques reste flou.Ce mémoire propose d’examiner ce concept, au travers de l’étude des situations de formation des leaders médicaux du Service de Santé des Armées (SSA) à la prise en charge d’afflux massif de victimes en médecine de l’avant. On adoptera le point de vue des formateurs, lorsque ceux-ci analysent l’activité des leadeurs.Dans une première partie (Chap. I,II et III), nous décrivons la formation des médecins du SSA, les enjeux et outils actuels de la formation à la prise en charge d’afflux massif de victimes et aux compétences non techniques, ainsi que le rôle qu’y jouent les formateurs. La partie théorique recense les travaux portant sur le concept de compétences non techniques, de son origine à sa diffusion dans divers domaines d’activité (Chap. IV, V). Nous décrivons les actuelles taxonomies NTS, dont la majorité est structurée en sept catégories NTS : leadership, travail d’équipe, communication, conscience de la situation, prise de décision, gestion de la fatigue et gestion du stress. Nous caractérisons l’activité des leaders médicaux (chap.VI.) puis positionnons le concept de compétences non techniques dans le domaine de l’ergonomie et de la didactique professionnelle (Chap. VII).La partie empirique débute par la construction d’un corpus recensant toutes les habiletés sous-jacentes à la performance du leader médical sur la base d’entretien d’alloconfrontation avec des formateurs du SSA (Chap. IX). Ce corpus est ensuite classé par les dix formateurs en trois classes : technique (T), non technique (NT), technique et non technique (T-NT).La première étude (Chap. X) analyse de la classification des formateurs, elle révèle l’importance de la classe NT, ainsi que l'existence de cinq styles représentationnels adoptés par les formateurs. La seconde étude (Chapitre XI) examine le sens conféré par les formateurs aux habiletés et souligne des écarts au sein même des styles représentationnels. Nous identifions cinq familles d’habiletés, avec une domination des familles dites faiblement-divergente (45%) et NT (41%). On constate que les formateurs ont identifié unanimement 30 habiletés comme étant non techniques qu'on appellera les habiletés NT-ONLY.Les études suivantes (Chap.XII et XIII) ont reposé sur le classement des 30 habiletés NT-ONLY par 21 formateurs CRM et 13 formateurs MED. La troisième étude (Chap. XII) a mis en évidence que tous les formateurs attribuent plus d’une catégorie par habileté. Ceci démontre que les catégories NTS ne sont pas exclusives. Par ordre décroissant, le leadership, la communication, le travail d’équipe et la conscience de la situation ont été les plus utilisées par les formateurs, sans différences intergroupes. Le groupe CRM a plus utilisé la catégorie de prise de décision, le groupe MED a favorisé la gestion du stress et de la fatigue. La quatrième étude (Chap. XIII) a examiné la possibilité de regrouper certaines des sept catégories NTS sur la base du classement des habiletés NT-ONLY. Nos résultats ont mis en évidence des proximités entre les catégories de leadership, travail d’équipe et communication, puis entre celles de conscience de la situation et prise de décision, et enfin entre celles de gestion de la fatigue et de gestion du stress. La dernière partie de cette thèse (Chap. XIV) discute de la méthodologie mise en place, des résultats obtenus et des questions qu’ils soulèvent. / The high-risk dynamic environments management (transports, nuclear industry, medicine etc.) increases every day in our societies. A good management of these environments requires the reliability of technical and organization systems. It also requires the training of operators in non-technical skills. This thesis is focused on this last point. In the literature, the non-technical skills concept stays unclear.This works examines this concept, based on the training situations of medical leaders from the Army Health Service to wounded people massive influx in theatre operation. We adopt the point of view from trainers when they are analyzing activity of leaders.In a first part (Chap. I, II & III), we describe the training of the French army physicians and the current stakes and tools of the wounded people massive influx management training. This part also describes current non-technical skills training and trainer roles. The theoretical part describes works around non-technical skills, from its origins to its diffusion in various areas (Chap. IV & V). We describe the current NTS taxonomies which are mainly based on a divided into seven NTS categories: leadership, teamworking, communication, situation awareness, decision making, coping with fatigue and managing stress. Then, we characterize the activity of medical leader (Chap. VI). This theoretical part lead us to consider non-technical skills as technical or non-technical abilities (Chap. VII) and is conclude with the formulation of our research questions (Chap. VIII).The empirical part of this thesis starts with the elaboration of a corpus (Chap. IX) listing all the abilities linked to the leader performance. The construction of this corpus is based on twenty individual alloconfrontation interviews conducted with physician-trainers. Ten of them classified the abilities into three classes: technical (T), non-technical (NT), technical and non-technical (T-NT).The first study (Chap. X) analyses trainer classification. It shows the importance of NT class and identify the existence of five “representational styles” among trainers. The second study (Chap. XI) examines the meaning assigned by each participant to ability and highlight gaps between trainer representations. Then we identified five ability families with a two main families: slightly-divergent (45%) and NT (41%). We notice that there is a core of thirty abilities which are unanimously classified as non-technical only.The following studies (Chap. XII and XIII) are based on the classification of the 30 NT-only abilities by CRM trainers and MED trainers. The third study highlight that all trainers associate more than once NTS category to each ability. That shows NTS categories are not exclusive. In a descendant order leadership, communication, teamworking and situation awareness are the most used by trainers without difference between groups. The CRM group used more the leadership category. The MED group used more stress managing and coping with fatigue. The fourth study examines if it possible to gather, even to merge, some NTS categories based on the classification of NT-ONLY abilities. Our results show the proximities between the categories of leadership, teamwork and communication, then between situation awareness and decision making, and finally between managing stress and coping with stress. The last part of this thesis (Chap. XIV) discuss about the methodology used, results and questions they raise.

Indiana University-Purdue University Indianapolis (IUPUI) / Although current augmented, virtual, and mixed reality (AR/VR/MR) systems are facing advanced and immersive experience in the entertainment industry with countless media forms. Theses systems suffer a lack of correct direct and indirect illumination modeling where the virtual objects render with the same lighting condition as the real environment. Some systems are using baked GI, pre-recorded textures, and light probes that are mostly accomplished offline to compensate for precomputed real-time global illumination (GI). Thus, illumination information can be extracted from the physical scene for interactively rendering the virtual objects into the real world which produces a more realistic final scene in real-time. This work approaches the problem of visual coherence in AR by proposing a system that detects the real-world lighting conditions in dynamic scenes, then uses the extracted illumination information to render the objects added to the scene. The system covers several major components to achieve a more realistic augmented reality outcome. First, the detection of the incident light (direct illumination) from the physical scene with the use of computer vision techniques based on the topological structural analysis of 2D images using a live-feed 360-degree camera instrumented on an AR device that captures the entire radiance map. Also, the physics-based light polarization eliminates or reduces false-positive lights such as white surfaces, reflections, or glare which negatively affect the light detection process. Second, the simulation of the reflected light (indirect illumination) that bounce between the real-world surfaces to be rendered into the virtual objects and reflect their existence in the virtual world. Third, defining the shading characteristic/properties of the virtual object to depict the correct lighting assets with a suitable shadow casting. Fourth, the geometric properties of real-scene including plane detection, 3D surface reconstruction, and simple meshing are incorporated with the virtual scene for more realistic depth interactions between the real and virtual objects. These components are developed methods which assumed to be working simultaneously in real-time for photo-realistic AR. The system is tested with several lighting conditions to evaluate the accuracy of the results based on the error incurred between the real/virtual objects casting shadow and interactions. For system efficiency, the rendering time is compared with previous works and research. Further evaluation of human perception is conducted through a user study. The overall performance of the system is investigated to reduce the cost to a minimum.

This degree project addresses poaching challenges by employing predictive analysis of animal movements and their correlation with the dynamic environment using a machine learning approach. The goal is to provide accurate predictions of animal movements, enabling rangers to intercept potential threats and safeguard wildlife from snares. A wide analysis considers previous studies on animal movements and both animal and environment data availability. To efficiently represent the dynamic environment and correlate it with animal movement data, accurate matching of environment variables to each animal measurement is crucial. We selected multiple environment datasets to capture a sufficient amount ofenvironmental properties. Due to practical constraints, daily representation of the environment is not achievable, and weekly mean or monthly mode values are used instead. Data insights are obtained through the training of a regression neural network using the filtered environmental and animal movement data. The results highlight the significant role ofenvironmental features in predicting animal movements, emphasizing their importance for accurate predictions. Despite some offset and few erroneous predictions, a strong similarity between animal predicted trajectory and animal true trajectory was achieved, indicating that the model is capable to capture general patterns and to correctly tune in predictions of detailed movements as well. The overall offset of the trajectories is still a weak point of this model, but it may just indicate the presence of some underlying systematic error that can be corrected through further work. The integration of such a developed prediction model into existing frameworks could assist law enforcingauthorities in preventing poaching activities.